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NxStage Medical/Inc · DEFM14A · On 9/11/07

Filed On 9/11/07 7:58pm ET   ·   SEC File 0-51567   ·   Accession Number 950135-7-5633

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  As Of                Filer                Filing    For/On/As Docs:Size              Issuer               Agent

 9/12/07  NxStage Medical/Inc               DEFM14A     9/12/07    1:470                                    Bowne of Boston I..01/FA

Definitive Proxy Solicitation Material -- Merger or Acquisition   ·   Schedule 14A
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: DEFM14A     Nxstage Medical, Inc.                               HTML   2.82M 


Document Table of Contents

Page (sequential) | (alphabetic) Top
 
11st Page   -   Filing Submission
"Table of Contents
"Questions and Answers
"Summary Term Sheet
"The Stock Purchase and the Stock Purchase Agreement
"Parties to the Stock Purchase
"Amendment to Our 2005 Plan
"Recommendations of the NxStage Board of Directors
"Opinion of NxStage's Financial Advisor Regarding the Stock Purchase
"Interests of Mr. Utterberg in the Stock Purchase
"Vote Required to Approve the Stock Purchase and the 2005 Plan Amendment
"Conditions to Completion of the Stock Purchase
"Termination of the Stock Purchase Agreement Under Specified Circumstances
"NxStage May be Required to Pay a Termination Fee Under Specified Circumstances
"U.S. Federal Income Tax Consequences of the Stock Purchase
"Anticipated Accounting Treatment
"Share Ownership of Directors and Executive Officers of NxStage
"Regulatory Matters
"Appraisal Rights
"SUMMARY SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA OF NxSTAGE
"Summary Selected Historical Combined Financial Data of Medisystems Group
"Summary Selected Unaudited Pro Forma Combined Financial Data
"Comparative Historical and Unaudited Pro Forma Per Share Data
"Market Price and Dividend Information
"Dividends
"Risk Factors
"Risks Related to the Stock Purchase
"Risks Related to NxStage
"Risks Related to the Combined Businesses Following the Stock Purchase
"Special Note Regarding Forward-Looking Statements
"THE SPECIAL MEETING OF NxSTAGE STOCKHOLDERS
"General
"Date, Time and Place
"Purpose of the Special Meeting
"Record Date, Shares of Common Stock Outstanding and Entitled to Vote
"Quorum and Vote of NxStage Stockholders Required
"Voting Instructions
"Revocation of Proxies
"Solicitation of Proxies
"MATTERS BEING SUBMITTED TO A VOTE OF NxSTAGE STOCKHOLDERS
"Proposal One -- Approval of the Issuance of the Stock Purchase Shares
"Proposal Two -- Approval of an Amendment to Our 2005 Plan
"The Stock Purchase
"Background of the Stock Purchase
"Our Reasons for the Stock Purchase
"Recommendation of Our Board of Directors
"Opinion of NxStage's Financial Advisor
"Our Current Relationship with Mr. Utterberg
"Intellectual Property
"Stock Purchase Consideration
"Lien on Medisystems' Assets
"Effective Time of the Stock Purchase
"Regulatory Approvals
"U.S. Federal Income Tax Consequences
"NASDAQ Listing
"Restrictions on the Resale of the Stock Purchase Shares
"Registration Rights
"The Stock Purchase Agreement
"Stock Purchase Consideration and Adjustment
"Conditions to the Completion of the Stock Purchase
"No Solicitation
"Meeting of Stockholders
"Covenants, Conduct of Business Pending the Stock Purchase
"Other Agreements
"Termination
"Expenses and Reimbursement
"Representations and Warranties
"Indemnification
"License Agreement and Consulting Agreement
"License Agreement
"Consulting Agreement
"NxSTAGE BUSINESS
"Recent Developments
"Overview
"Our Products and Services
"Competition
"Sales and Marketing
"Research and Development
"Manufacturing
"Government Regulation
"Foreign Regulation of Medical Devices
"Fraud and Abuse Laws
"Reimbursement
"Employees
"NxSTAGE MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS OF OPERATIONS
"Recent Events
"Statement of Operations
"Revenues
"Cost of Revenues
"Operating Expenses
"Results of Operations
"Liquidity and Capital Resources
"Summary of Critical Accounting Policies and Estimates
"Related-Party Transactions
"Off-Balance Sheet Arrangements
"Recent Accounting Pronouncements
"QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT NxSTAGE'S MARKET RISK
"Interest Rate Exposure
"Foreign Currency Exposure
"Equity Security Price Risk
"Medisystems Business
"Medisystems Products
"Medisystems Management's Discussion and Analysis of Financial Conditions and Results of Operations
"Basis of Presentation
"Quantitative and Qualitative Disclosures About Medisystems' Market Risk
"Management Following the Stock Purchase
"Resignation of the MDS Entities' Current Officers and Directors
"Executive Officers and Directors of NxStage Following the Stock Purchase
"Unaudited Pro Forma Combined Financial Statements
"DESCRIPTION OF NxSTAGE CAPITAL STOCK
"Common Stock
"Preferred Stock
"Warrants
"Options
"Anti-Takeover Provisions of Delaware Law, Our Certificate of Incorporation and Our Bylaws
"Limitation of Liability and Indemnification
"Transfer Agent and Registrar
"NASDAQ Global Market
"NxSTAGE EXECUTIVE OFFICER AND DIRECTOR COMPENSATION
"Compensation Discussion and Analysis
"Executive Compensation
"Employment Agreements with Named Executive Officers
"Potential Termination and Change in Control Payments
"Securities Authorized for Issuance Under Our Equity Compensation Plan
"Director Compensation
"Compensation Committee Interlocks and Insider Participation
"Compensation Committee Report
"NxSTAGE CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
"Stock Purchase
"Supply Agreement with Medisystems
"Policies and Procedures Regarding Review, Approval and Ratification of Related Person Transactions
"NxSTAGE PRINCIPAL STOCKHOLDERS
"Stockholder Proposals for the 2008 Annual Meeting
"Delivery of Security Holder Documents
"Where You Can Find More Information
"INDEX TO NxSTAGE CONSOLIDATED FINANCIAL STATEMENTS
"Index to Medisystems Group Combined Financial Statements
"Condensed Consolidated Balance Sheets at June 30, 2007 and December 31, 2006
"Condensed Consolidated Statements of Operations for the Three and Six Months Ended June 30, 2007 and 2006
"Condensed Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2007 and 2006
"Notes to Condensed Consolidated Financial Statements
"Report of Independent Registered Public Accounting Firm
"Consolidated Balance Sheets at December 31, 2006 and 2005
"Consolidated Statements of Operations for the years ended December 31, 2006, 2005 and 2004
"Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) for the years ended December 31, 2006, 2005, and 2004
"Consolidated Statements of Cash Flows for the years ended December 31, 2006, 2005 and 2004
"Notes to Consolidated Financial Statements
"Report of Independent Certified Public Accountants relating to Medisystems Group Companies
"Independent Auditors' Report relating to Medisystems Europe S.p.A
"Independent Auditors' Report relating to Medimexico, S. de R.L. de C.V
"Combined Balance Sheets at June 30, 2007 and December 31, 2006 and 2005
"Combined Statements of Income, Comprehensive Income (Loss), and Retained Earnings (Deficit) for the Six Months Ended June 30, 2007 and 2006 and for the Years Ended December 31, 2006, 2005 and 2004
"Combined Statements of Cash Flows for the Six Months Ended June 30, 2007 and 2006 and for the Years Ended December 31, 2006, 2005 and 2004
"Notes to Combined Financial Statements

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  defm14a  

Table of Contents

Comment:  BEGIN LOGICAL PAGE
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
 
SCHEDULE 14A
(Rule 14a-101)
 
INFORMATION REQUIRED IN PROXY STATEMENT
SCHEDULE 14A INFORMATION
 
Proxy Statement Pursuant to Section 14(a) of the Securities
Exchange Act of 1934 (Amendment No.     )
 
Filed by the Registrant þ
 
Filed by a Party other than the Registrant o
 
Check the appropriate box:
 
o  Preliminary Proxy Statement
o  Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
þ  Definitive Proxy Statement
o  Definitive Additional Materials
o  Soliciting Material Pursuant to §240.14a-12
 
NxSTAGE MEDICAL, INC.
(Name of Registrant as Specified In Its Charter)
 
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
 
o   No fee required.
 
o   Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.
 
  (1)   Title of each class of securities to which transaction applies:
 
 
  (2)   Aggregate number of securities to which transaction applies:
 
 
  (3)   Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):
 
 
  (4)   Proposed maximum aggregate value of transaction:
 
 
  (5)   Total fee paid:
 
 
þ   Fee paid previously with preliminary materials:  $2,752
 
o   Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.
 
  (1)   Amount Previously Paid:
  (2)   Form, Schedule or Registration Statement No.:
  (3)   Filing Party:
  (4)   Date Filed:

Comment:  END LOGICAL PAGE


Table of Contents

 
PROXY STATEMENT
 
Graphic -- (LOGO)
439 South Union St., 5th Floor
Lawrence, Massachusetts 08143
 
NxStage Medical, Inc. and David S. Utterberg have entered into a stock purchase agreement under which we will purchase from Mr. Utterberg the issued and outstanding shares of Medisystems Corporation and Medisystems Services Corporation, 90% of the issued and outstanding shares of Medisystems Europe S.p.A. (the remaining equity of which is held by Medisystems Corporation) and 0.273% of the issued and outstanding equity participation of Medisystems Mexico s. de R.L. de C.V. (the remaining equity of which is held by Medisystems Corporation), which are collectively referred to as the MDS Entities. Our acquisition of the MDS Entities is referred to as the Stock Purchase. Following the Stock Purchase, each of the MDS Entities will be a direct or indirect wholly-owned subsidiary of ours.
 
We will issue Mr. Utterberg 6,500,000 shares of our common stock, subject to a post-closing working capital adjustment that may increase or decrease the number of shares of common stock we issue to Mr. Utterberg, in consideration for the Stock Purchase. The shares of our common stock issuable to Mr. Utterberg pursuant to this proxy statement are referred to as the Shares. In addition, we may be required to issue additional shares of our common stock to Mr. Utterberg. Pursuant to the terms of the Stock Purchase, we and Mr. Utterberg have agreed to indemnify each other in the event of certain breaches or failures, and any such indemnification amounts must be paid in shares of our common stock, valued at the time of payment. However, we will not be required to issue shares for indemnification purposes that in the aggregate would exceed 20% of the then outstanding shares of our common stock without first obtaining stockholder approval, and any such shares will not be registered under the Securities Act of 1933, as amended.
 
Our shares of common stock are listed on the NASDAQ Global Market under the symbol “NXTM”. As of September 10, 2007, the last trading day before the date of this proxy statement, the last sales price of our common stock, as quoted on the NASDAQ Global Market, was $13.01.
 
This proxy statement has been prepared in connection with a special meeting of our stockholders to be held at the offices of WilmerHale, 60 State Street, Boston, Massachusetts 02109, on October 1, 2007 at 10:00 a.m., local time. At the special meeting, stockholders will consider a proposal to approve the issuance of the Shares and a proposal to amend our 2005 Stock Incentive Plan to increase the number of shares of our common stock that may be issued under the plan. Pursuant to applicable NASDAQ Marketplace Rules, the issuance of the shares of our common stock pursuant to the Stock Purchase and the amendment to our 2005 Stock Incentive Plan require approval by holders of a majority of the shares of our common stock present and voting at a special meeting of stockholders at which a quorum is present.
 
This proxy statement sets forth more information about NxStage, Mr. Utterberg, the MDS Entities, the Stock Purchase and the proposed amendment to our 2005 Stock Incentive Plan. We encourage you to read carefully this proxy statement before voting, including the section entitled “Risk Factors” beginning on page 18.
 
Sincerely,
 
Graphic -- -s- Winifred L. Swan
Winifred L. Swan, Secretary
 
This document is dated September 11, 2007, and is first being mailed to our stockholders on or about September 13, 2007.



Table of Contents

 
NxSTAGE MEDICAL, INC.
439 South Union St., 5th Floor
Lawrence, Massachusetts 08193
 
NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
 
To the stockholders of NxStage Medical, Inc.:
 
A special meeting of our stockholders will be held at the offices of WilmerHale, 60 State Street, Boston, Massachusetts 02109, on October 1, 2007 at 10:00 a.m., local time. At the special meeting, stockholders will consider and act upon the following matters:
 
  •  the issuance of 6,500,000 shares of our common stock, plus any additional shares of common stock issuable pursuant to a post-closing adjustment, to David S. Utterberg pursuant to the stock purchase agreement, dated as of June 4, 2007, between Mr. Utterberg and NxStage, as amended (which is referred to in this notice and proxy statement as the stock purchase agreement), and any additional shares of our common stock that we may be required to issue Mr. Utterberg in the future to satisfy any indemnification claims payable by us for failures or breaches under the stock purchase agreement and/or the consulting agreement we intend to enter into with Mr. Utterberg; and
 
  •  an amendment to our 2005 Stock Incentive Plan, or 2005 Plan, to increase the number of shares of our common stock that may be issued under the 2005 Plan by an additional 3,800,000 shares, of which no more than 1,500,000 shares shall be granted as restricted stock.
 
Pursuant to applicable NASDAQ Marketplace Rules, the issuance of shares of our common stock pursuant to the stock purchase agreement and the amendment to our 2005 Plan require approval by holders of a majority of the our shares of common stock present and voting at a special meeting of stockholders at which a quorum is present.
 
After careful consideration, our board of directors has approved the proposals referred to above and concluded that they are fair to, and in the best interests of, NxStage and our stockholders. Our board of directors recommends that our stockholders vote “FOR” each of the proposals referred to above.
 
You are entitled to vote only if you were a holder of our common stock at the close of business on September 10, 2007, the record date for the special meeting. Only record holders of our common stock at the close of business on that date are entitled to notice of and to vote at the special meeting and at any adjournments or postponements thereof. At the close of business on the record date, there were 30,041,633 shares of our common stock outstanding and entitled to vote.
 
The proxy statement accompanying this notice sets forth more information about NxStage, Mr. Utterberg, the stock purchase agreement and related transactions and the proposed amendment to our 2005 Plan. The accompanying materials also provide instructions on how to vote your shares in person at the special meeting or by proxy.
 
Your vote is very important. Whether or not you plan to attend the special meeting, please take the time to vote by completing and mailing the enclosed proxy card to NxStage or, if the option is available to you, by granting your proxy electronically over the Internet or by telephone. If your shares are held in “street name,” meaning they are held for your account by a broker or other nominee, your shares will only be voted at the special meeting if you direct your broker to vote your shares by following the procedures established by your broker.
 
By order of the board of directors,
 
Graphic -- -s- Winifred L. Swan
Winifred L. Swan, Secretary
 
September 11, 2007
Lawrence, Massachusetts



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Comment:  link1 "QUESTIONS AND ANSWERS"
QUESTIONS AND ANSWERS
 
The following questions and answers briefly address some commonly asked questions about the special meeting and this proxy statement. They may not include all the information that is important to you. You should read carefully this entire proxy statement, including the annexes and the other documents referred to herein.
 
Q: What will happen in connection with the Stock Purchase?
 
A: We are proposing to purchase from David S. Utterberg, who is a member of our board of directors and the owner of approximately 6.7% of our common stock:
 
• all of the issued and outstanding shares of Medisystems Corporation, or MDS;
 
• all of the issued and outstanding shares of Medisystems Services Corporation, or MDS Services;
 
• 90% of the issued and outstanding shares of Medisystems Europe S.p.A. (the remaining equity of which is held by MDS), or MDS Italy; and
 
• 0.273% of the issued and outstanding equity participation of Medisystems Mexico s. de R.L. de C.V. (the remaining equity of which is held by MDS), or MDS Mexico.
 
MDS, MDS Services, MDS Italy and MDS Mexico are referred to collectively in this proxy statement as the MDS Entities. We refer to our acquisition of the MDS Entities under the stock purchase agreement as the Stock Purchase.
 
As consideration for the Stock Purchase, we will issue Mr. Utterberg 6,500,000 shares of our common stock, plus any additional shares issuable pursuant to a post-closing working capital adjustment provided for in the stock purchase agreement. We may also be required to issue Mr. Utterberg additional shares of our common stock, which we refer to as the indemnification shares, to satisfy any indemnification claims payable by us under the stock purchase agreement and/or the consulting agreement we intend to enter into with Mr. Utterberg, which is described below. In this proxy statement, we refer to the shares to be issued to Mr. Utterberg as consideration for the Stock Purchase, together with the indemnification shares, as the Stock Purchase Shares.
 
Following the Stock Purchase, each of the MDS Entities will be a direct or indirect wholly-owned subsidiary of ours. A copy of the stock purchase agreement is attached to this proxy statement as Annex A.
 
Q: Why are you receiving this proxy statement?
 
A: Our stock is listed on the NASDAQ Global Market. Rule 4350(i) of the NASDAQ Marketplace Rules requires listed companies to obtain stockholder approval in certain circumstances, which include:
 
• when an issuance or potential issuance of securities would result in a change in control of the company, as such term has been interpreted by NASDAQ for purposes of Rule 4350(i);
 
• when an equity compensation arrangement is made, pursuant to which stock may be acquired by directors or directors’ affiliates; and
 
• when in connection with the stock or assets of another company, where due to the issuance of common stock or securities convertible into common stock, the securities to be issued represent 20% or more of the voting power or number of shares of common stock outstanding before the issuance.
 
You are being asked to approve the issuance of the Stock Purchase Shares because such issuance implicates each of the circumstances listed above, and, pursuant to the stock purchase agreement, our stockholders approving the issuance of the Stock Purchase Shares to Mr. Utterberg is a condition to closing the Stock Purchase. In addition, we are proposing to amend our 2005 Stock Incentive Plan, or 2005 Plan, to increase the number of shares reserved for issuance under the 2005 Plan by 3,800,000, from 3,601,459 to 7,401,459; provided that, of the additional 3,800,000 shares, no more than 1,500,000 shares may be granted as restricted stock. Under NASDAQ Marketplace Rule 4350(i) and the terms of the 2005 Plan, we are required to obtain stockholder approval prior to amending the 2005 Plan to increase the number of

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shares issuable under the 2005 Plan. We will hold a special meeting of our stockholders to obtain approval of the issuance of the Stock Purchase Shares and the amendment to our 2005 Plan. This proxy statement contains important information about NxStage, the special meeting, the Stock Purchase, the MDS Entities, Mr. Utterberg and the proposed amendments to our 2005 Plan, and you should read it carefully.
 
Q: Why is NxStage proposing the Stock Purchase?
 
A: We believe the Stock Purchase will provide the following benefits:
 
• expansion of our business on a commercial, operational and financial scale; and
 
• enhancement of our capability to execute operationally.
 
We also believe that the Stock Purchase has the potential to accelerate our profitability. For a description of the other factors considered by our board of directors in determining to approve the Stock Purchase, see “The Stock Purchase — Our Reasons for the Stock Purchase” beginning on page 57.
 
Q: Does NxStage’s board of directors recommend voting in favor of the issuance of the Stock Purchase Shares and the amendment to the 2005 Plan?
 
A: Proposal One — Approval of the Issuance of the Stock Purchase Shares
 
Yes. After careful consideration, our board of directors determined that the Stock Purchase is fair to, and in the best interests of, NxStage and our stockholders. Our board of directors recommends that our stockholders vote “FOR” the issuance of the Stock Purchase Shares.
 
For a description of the factors considered by our board of directors in making its determination, see “The Stock Purchase — Our Reasons for the Stock Purchase” beginning on page 57.
 
Proposal Two — Approval of an Amendment to our 2005 Plan
 
Yes. After careful consideration, our board of directors believes that the proposed amendment to our 2005 Plan is in the best interests of NxStage and our stockholders and recommends a vote “FOR” the approval of the amendment to our 2005 Plan.
 
For a description of the factors considered by our board of directors in making its determination, see “Matters Submitted to a Vote of NxStage Stockholders — Proposal Two — Approval of an Amendment to Our 2005 Plan” beginning on page 49.
 
Q: Is the Stock Purchase a related person transaction?
 
A: Yes. Mr. Utterberg is a director of NxStage and currently owns approximately 6.7% of our outstanding common stock based on the number of shares of our common stock outstanding as of July 31, 2007. Pursuant to our policies and procedures concerning related person transactions, the Audit Committee of our board of directors reviewed and approved the Stock Purchase.
 
Q: What will Mr. Utterberg receive as consideration for the Stock Purchase?
 
A: Upon the closing of the Stock Purchase, we will issue Mr. Utterberg 6,500,000 shares of our common stock. The total number of shares payable by us to Mr. Utterberg is subject to a post-closing working capital adjustment pursuant to the stock purchase agreement that may increase or decrease the final number of shares of common stock issued to Mr. Utterberg. We will not know, until at least 60 days following the closing of the Stock Purchase, how many shares, if any, we will be required to issue, or which Mr. Utterberg will be required to return, in connection with the post-closing working capital adjustment. One million of the shares issued to Mr. Utterberg will be placed into escrow to cover potential indemnification claims we may have against him. For a further discussion of the consideration payable to Mr. Utterberg, see “The Stock Purchase — Stock Purchase Consideration” on page 66 and for a further discussion of the escrow arrangement and indemnification see “The Stock Purchase Agreement — Indemnification” beginning on page 74.


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Q. Could we be required to issue Mr. Utterberg additional shares of our common stock in connection with the Stock Purchase?
 
A. Yes. We may be required to issue Mr. Utterberg additional shares of our common stock in the event we are required to indemnify him for certain breaches or failures. Pursuant to the terms of the stock purchase agreement and the consulting agreement, we and Mr. Utterberg have agreed to indemnify each other in the event of certain breaches or failures under such agreements. Indemnification amounts payable by either party, if any, must be paid in shares of our common stock, valued at the time of payment. However, we will not be required to issue shares for indemnification purposes that in the aggregate would exceed 20% of the then outstanding shares of our common stock without first obtaining stockholder approval, and any such shares will not be registered under the Securities Act of 1933, as amended. For a further discussion of indemnification see “The Stock Purchase Agreement — Indemnification” beginning on page 74.
 
Q: When does NxStage expect to complete the Stock Purchase?
 
A: Subject to satisfaction or waiver of all conditions, we expect to complete the Stock Purchase approximately two days following the special meeting.
 
For a description of the conditions to completion of the Stock Purchase, see “The Stock Purchase Agreement — Conditions to the Completion of the Stock Purchase” beginning on page 68.
 
Q: Are there risks you should consider in deciding whether to vote for the issuance of the Stock Purchase Shares?
 
A: Yes. In evaluating the issuance of the Stock Purchase Shares, you should carefully consider the factors discussed under the heading “Risk Factors” beginning on page 18.
 
Q: Why are we proposing to amend the 2005 Plan to increase the number of shares issuable under the plan?
 
A: If the Stock Purchase is completed, our employee population will grow from approximately 300 to over 1,000. In order for us to grant equity incentives to these new employees and to support our continued growth and compensation needs, we are seeking to increase the number of shares available for issuance under the 2005 Plan by 3,800,000 shares, of which no more than 1,500,000 shares may be issued as restricted stock awards.
 
Q: What vote is required by NxStage stockholders to approve the issuance of the Stock Purchase Shares and the 2005 Plan Amendment?
 
A: Pursuant to applicable NASDAQ Marketplace Rules and our by-laws, the affirmative vote of the holders of a majority of the shares of our common stock represented in person or by proxy and voting on such matter at a special meeting at which a quorum is present is required to approve the issuance of the Stock Purchase Shares. In addition, pursuant to NASDAQ Marketplace Rules, our bylaws and the terms of our 2005 Plan, the affirmative vote of the holders of a majority of the shares of our common stock represented in person or by proxy and voting on such matter at a special meeting at which a quorum is present is required to approve the proposed amendment to our 2005 Plan. As of July 31, 2007, our directors and executive officers and their affiliates, including Mr. Utterberg, were entitled to vote approximately 32.5% of our outstanding shares of common stock (not including options, warrants or other convertible securities).
 
Q: What do you need to do now?
 
A: We urge you to carefully read and consider the information contained in this document, including the annexes, and to consider how the Stock Purchase, including the issuance of the Stock Purchase Shares, and the proposal to increase the number of shares available for issuance under our 2005 Plan will affect you as a stockholder. You should then vote as soon as possible in accordance with the instructions provided in this document and on the enclosed proxy card.


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Q: When and where is the special meeting?
 
A: The special meeting of our stockholders will be held at the offices of WilmerHale, 60 State Street, Boston, Massachusetts 02109, on October 1, 2007 at 10:00 a.m., local time.
 
Q: How do you vote?
 
A: If you are a record holder, meaning your shares are registered in your name, you may vote:
 
(1)    Over the Internet:  Go to the website of our tabulator, Computershare Investor Services, at www.investorvote.com. Use the vote control number printed on your enclosed proxy card to access your account and vote your shares. You must specify how you want your shares voted or your Internet vote cannot be completed and you will receive an error message. Your shares will be voted according to your instructions.
 
(2)    By Telephone:  Call 1-800-652-VOTE (8683) toll free from the United States, Canada and Puerto Rico, and follow the instructions on your enclosed proxy card. You must specify how you want your shares voted and confirm your vote at the end of the call or your telephone vote cannot be completed. Your shares will be voted according to your instructions.
 
(3)    By Mail:  Complete and sign your enclosed proxy card and mail it in the enclosed postage prepaid envelope to Computershare Investor Services. Your shares will be voted according to your instructions. If you do not specify how you want your shares voted, they will be voted as recommended by our board of directors.
 
(4)    In Person at the Special Meeting:  If you attend the special meeting, you may deliver your completed proxy card in person or you may vote by completing a ballot, which we will provide to you at the meeting.
 
If your shares are held in “street name”, meaning they are held for your account by a broker or other nominee, you may vote:
 
(1)    Over the Internet or by Telephone:  You will receive instructions from your broker or other nominee if they permit Internet or telephone voting. You should follow those instructions.
 
(2)    By Mail:  You will receive instructions from your broker or other nominee explaining how you can vote your shares by mail. You should follow those instructions.
 
(3)    In Person at the Special Meeting:  Contact your broker or other nominee who holds your shares to obtain a brokers’ proxy card and bring it with you to the special meeting. You will not be able to vote in person at the special meeting unless you have a proxy from your broker issued in your name giving you the right to vote your shares.
 
Q: What happens if you do not vote?
 
A: If you do not vote at the special meeting by submitting a proxy or otherwise, your shares will not be counted as present for the purpose of determining a quorum and will have no effect on the outcome of the proposal to approve the issuance of the Stock Purchase Shares or the proposal to increase the number of shares issuable under our 2005 Plan. If you submit a proxy card and affirmatively elect to abstain from voting, your proxy will be counted as present for the purpose of determining the presence of a quorum but will not be voted at the special meeting. If you hold shares in street name and do not instruct your broker how to vote your shares, your shares will be counted as present for the purpose of determining the presence of a quorum but will not be voted at the special meeting. As a result, your abstention will have the same effect as a vote against such proposals. A “broker non-vote” will have no effect on, and will not be counted towards, the total vote. Each of the proposals to be considered at the special meeting requires the affirmative vote of a majority of the votes cast at the special meeting.


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Q: Can you change your vote after you have mailed your signed proxy?
 
A: Yes. If you want to change your vote, send our corporate secretary a later dated, signed proxy card before the special meeting or attend the special meeting and vote in person, or you may vote over the Internet or by telephone as only your latest Internet or telephone vote received before the special meeting will be counted. You may also revoke your proxy by sending written notice to our corporate secretary before the special meeting. If you have instructed your broker to vote your shares, you must follow your broker’s directions in order to change those instructions.
 
Q: Are you entitled to appraisal rights?
 
A: Our stockholders are not entitled to appraisal rights in connection with any proposals to be considered at the special meeting.
 
Q: Who will bear the costs of the proxy solicitation?
 
A: We will bear the costs of soliciting proxies, including the printing, mailing and filing of this proxy statement and any additional information furnished to stockholders. We have engaged Georgeson Shareholder Communications Inc., a proxy solicitation firm, to solicit proxies from our stockholders. For these services, we expect to pay a fee of approximately $7,500, plus expenses. Our directors, officers and employees may also solicit proxies by telephone, email, facsimile and in person, without additional compensation. Upon request, we will reimburse brokerage houses and other custodians, nominees and fiduciaries for their reasonable out-of-pocket expenses for distributing proxy materials.
 
Q: Whom should you call with questions?
 
A: If you have any questions about the Stock Purchase or any of the proposals to be considered at the special meeting, or if you need additional copies of this document or the enclosed proxy, you should contact:
 
     
Georgeson Shareholder Communications Inc.
17 State Street, 10th Floor
New York, NY 10004
(888) 605-7618
  NxStage Medical, Inc.
439 South Union Street, 5th Floor
Lawrence, Massachusetts 08143
(978) 687-4700
Attention: General Counsel
 
You may also obtain additional information about us from documents filed with the Securities and Exchange Commission by following the instructions under “Where You Can Find More Information” on page 174.


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Comment:  Begin box 1 Comment:  link1 "SUMMARY TERM SHEET"
 
SUMMARY TERM SHEET
 
This summary highlights only selected information from this proxy statement and may not contain all of the information that is important to you. To better understand the Stock Purchase and the proposals being considered at the special meeting, you should read this entire proxy statement carefully, including the stock purchase agreement, attached as Annex A, the opinion of Merrill Lynch, Pierce, Fenner & Smith Incorporated, attached as Annex B, and the other documents to which we refer. You may obtain further information about us by following the instructions under the heading “Where You Can Find More Information” on page 174. We have included page references parenthetically to direct you to a more complete description of the topics presented in this summary.
Comment:  link1 "The Stock Purchase and the Stock Purchase Agreement (see pages 55 and 68)"
 
The Stock Purchase and the Stock Purchase Agreement (see pages 55 and 68)
 
We have agreed to acquire the equity interests in the MDS Entities held by Mr. Utterberg. Following the Stock Purchase, each of the MDS Entities will be a direct or indirect wholly-owned subsidiary of ours. In consideration for the Stock Purchase, we will issue 6,500,000 shares of our common stock to Mr. Utterberg, subject to a post-closing working capital adjustment that may increase or decrease the number of shares of our common stock to be issued to Mr. Utterberg. In addition, we may be required to issue additional shares of common stock to Mr. Utterberg in the event we are required to indemnify him for certain breaches or failures. Following the consummation of the Stock Purchase, Mr. Utterberg will own approximately 23.4% of our outstanding common stock, assuming he is issued 6,500,000 shares of our common stock. Mr. Utterberg is currently a member of our board of directors. He will continue to be a director following the closing of the Stock Purchase.
 
The stock purchase agreement, which is the legal document governing the Stock Purchase, is attached as Annex A to this document. You should read the entire agreement carefully and in its entirety.
Comment:  link1 "Parties to the Stock Purchase"
 
Parties to the Stock Purchase
 
NxStage Medical, Inc.
439 South Union Street, 5th Floor
Lawrence, Massachusetts 08143
(978) 687-4700
 
We are a medical device company that develops, manufactures and markets innovative systems for the treatment of end-stage renal disease, or ESRD, and acute kidney failure. We market our principal product, the System One, to dialysis clinics for chronic hemodialysis treatment, providing clinics with improved access to the developing home hemodialysis market and the ability to expand their patient base by adding home-based patients without adding clinic infrastructure.
 
We were incorporated on December 31, 1998, under the name QB Medical, Inc. and changed our name to NxStage Medical, Inc. in 1999. Our principal offices are located at 439 South Union Street, 5th Floor, Lawrence, Massachusetts 08143, and our telephone number at that address is (978) 687-4700.
 
David S. Utterberg
c/o Medisystems Corporation
701 Pike Street, 16th Floor
Seattle, Washington 98101
(206) 834-1200
 
Medisystems, the business we are acquiring from Mr. Utterberg, is a medical device company that designs, manufactures, assembles, imports and distributes disposables used in dialysis and related blood treatments and procedures. Medisystems is a leader in the market for hemodialysis blood tubing sets, A.V. fistula needles, apheresis needles and hemodialysis transducer protectors in the United States. Medisystems is also the sole supplier of the disposable cartridges used in our primary product, the System One.
Comment:  End box 1


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Mr. Utterberg, a NxStage director, is the sole stockholder of MDS, a Washington corporation incorporated in 1981, and MDS Services, a Nevada corporation incorporated in 1998. Mr. Utterberg is also the owner of 90% of the issued and outstanding shares of MDS Italy, a company organized in 1991 under the laws of Italy in Sorbara, Modena, Italy, and 0.273% of the issued and outstanding equity participation of MDS Mexico, a company organized in 1993 under the laws of Mexico in Tijuana, Baja California, Mexico. MDS holds the remaining issued and outstanding equity interests in each of MDS Italy and MDS Mexico.
 
Mr. Utterberg is also the sole stockholder of Medisystems Technology Corporation, or MTC, Medisystems Research Corporation, or MRC, Life Stream Medical Corporation, or LSM, and Infusion Care Services, or ICS, which entities we are not acquiring in connection with the Stock Purchase. In this proxy statement, MTC, MRC, LSM, ICS and the MDS Entities are collectively referred to as the Medisystems Group. Unless otherwise indicated, all financial data presented in this proxy statement with respect to Medisystems is the financial data of the Medisystems Group.
Comment:  link1 "Amendment to Our 2005 Plan (see page 49)"
 
Amendment to Our 2005 Plan (see page 49)
 
Our board of directors has approved, subject to stockholder approval, an amendment to our 2005 Plan, increasing from 3,601,459 to 7,401,459 the number of shares of our common stock issuable under the 2005 Plan; provided that of this 3,800,000 share increase, no more than 1,500,000 shares may be issued as restricted stock awards.
Comment:  link1 "Recommendations of the NxStage Board of Directors (see pages 49 and 54)"
 
Recommendations of the NxStage Board of Directors (see pages 49 and 54)
 
After careful consideration, our board of directors determined that the Stock Purchase is advisable, and in the best interests, of NxStage and our stockholders, and has approved the Stock Purchase. Our board of directors recommends that our stockholders vote “FOR” the issuance of the Stock Purchase Shares. Mr. Utterberg did not participate in our discussions or consideration of, or the board votes authorizing the Stock Purchase.
 
After careful consideration, our board of directors determined that the amendment to our 2005 Plan to increase the number of shares issuable thereunder is in the best interests of NxStage and our stockholders. Our board of directors recommends that our stockholders vote “FOR” the approval of the amendment to our 2005 Plan.
Comment:  link1 "Opinion of NxStage’s Financial Advisor Regarding the Stock Purchase (see page 59)"
 
Opinion of NxStage’s Financial Advisor Regarding the Stock Purchase (see page 59)
 
On June 4, 2007, Merrill Lynch delivered its written opinion to our board of directors that, as of that date and subject to the assumptions, considerations and limitations set forth in its opinion, the Stock Purchase was fair, from a financial point of view, to us. Merrill Lynch provided its opinion for the information and assistance of our board of directors in connection with its consideration of the Stock Purchase. The Merrill Lynch opinion is not a recommendation as to how any NxStage stockholder should vote or take any other action with respect to the proposal to approve the issuance the Stock Purchase Shares.
 
The full text of the written opinion of Merrill Lynch, which sets forth assumptions made, matters considered and limitations on the review undertaken in connection with its opinion, is attached to this proxy statement as Annex B. You are urged to read the opinion carefully and in its entirety. You should carefully consider the discussion of Merrill Lynch’s analysis under the heading “Opinion of NxStage’s Financial Advisor” beginning on page 59.
Comment:  link1 "Interests of Mr. Utterberg in the Stock Purchase (see page 65)"
 
Interests of Mr. Utterberg in the Stock Purchase (see page 65)
 
When considering the recommendation of our board of directors, you should be aware that Mr. Utterberg, a NxStage director, has interests in the Stock Purchase that are different from yours. Mr. Utterberg owns, directly or indirectly, all of the equity interests in the MDS Entities. Mr. Utterberg will receive 6,500,000 shares of our common stock, subject to a post-closing working capital adjustment, if the Stock Purchase is approved and completed. As a result, Mr. Utterberg’s aggregate ownership of our outstanding stock will increase to


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approximately 23.4% of our outstanding common stock, assuming he receives 6,500,000 shares. Additionally, in connection with the Stock Purchase we will enter into a two-year consulting agreement with Mr. Utterberg pursuant to which we will pay him $200,000 annually, plus reimbursement of certain expenses, and we will receive through our ownership of MDS a license to patents and other intellectual property rights from DSU Medical Corporation, a corporation wholly-owned by Mr. Utterberg. The consulting agreement and license agreement are each more fully detailed in this proxy statement under the heading “License Agreement and Consulting Agreement” beginning on page 75.
 
Given his interests in the Stock Purchase and related transactions, Mr. Utterberg did not participate in discussions held by our board of directors concerning these transactions, nor did he participate in the board votes authorizing these transactions. In addition, the Stock Purchase and consulting arrangement with Mr. Utterberg are related person transactions for purposes of applicable rules of the Securities and Exchange Commission, or SEC, and our internal policies concerning related persons. Accordingly, our Audit Committee, as well as our board of directors, reviewed and approved the transactions. Our policies and procedures regarding the review, approval and ratification of related person transactions are described under the heading “NxStage Certain Relationships and Related Transactions” beginning on page 168.
 
Following the Stock Purchase, Mr. Utterberg will continue to serve on our board of directors. In addition, the stock purchase agreement provides that, if Mr. Utterberg is no longer a director of NxStage, our board of directors will nominate for election to our board any director nominee proposed by Mr. Utterberg, subject to certain conditions. Our board of directors took into account these interests in considering whether to approve the Stock Purchase.
Comment:  link1 "Vote Required to Approve the Stock Purchase and the 2005 Plan Amendment"
 
Vote Required to Approve the Stock Purchase and the 2005 Plan Amendment
 
Pursuant to applicable NASDAQ Marketplace Rules and our by-laws, the affirmative vote of the holders of a majority of the shares of our common stock present and voting on the matter at the special meeting is required to approve the issuance of the Stock Purchase Shares to Mr. Utterberg. Pursuant to applicable NASDAQ Marketplace Rules, our bylaws and the Plan, the affirmative vote of the holders of a majority of the shares of our common stock present and voting on the matter at the special meeting is required to approve the amendment to our 2005 Plan.
Comment:  link1 "Conditions to Completion of the Stock Purchase (see page 68)"
 
Conditions to Completion of the Stock Purchase (see page 68)
 
Several conditions must be satisfied or waived before we and Mr. Utterberg complete the Stock Purchase, including those summarized below:
 
  •  expiration or termination of applicable waiting periods under the Hart-Scott-Rodino Act;
 
  •  approval by our stockholders of the issuance of shares of our common stock to Mr. Utterberg in connection with the Stock Purchase;
 
  •  receipt by each party of the waivers, permits, consents, approvals or other authorizations required to complete the Stock Purchase, as specified in the stock purchase agreement;
 
  •  filing by us of all filings required to be filed with NASDAQ;
 
  •  accuracy of each party’s respective representations and warranties in the stock purchase agreement;
 
  •  compliance by each party with its covenants in the stock purchase agreement; and
 
  •  absence of court orders or legal proceedings that would prevent the consummation of the Stock Purchase, cause the Stock Purchase to be rescinded or have a material adverse effect on the MDS Entities.
 
Comment:  link1 "Termination of the Stock Purchase Agreement Under Specified Circumstances (see page 72)"
Termination of the Stock Purchase Agreement Under Specified Circumstances (see page 72)
 
Under circumstances specified in the stock purchase agreement, either we or Mr. Utterberg may terminate the stock purchase agreement and, as a result, the Stock Purchase would not be completed. These circumstances generally include if:
 
  •  the Stock Purchase is not completed on or before December 31, 2007;


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  •  we or Mr. Utterberg breach any representation, warranty or covenant contained in the stock purchase agreement, and such breach remains uncured, such that the conditions to the completion of the Stock Purchase regarding representations, warranties and covenants would not be satisfied;
 
  •  our stockholders do not approve the issuance of shares of our common stock to Mr. Utterberg pursuant to the stock purchase agreement; or
 
  •  we and Mr. Utterberg consent to the termination of the stock purchase agreement by mutual written agreement.
Comment:  link1 "NxStage May be Required to Pay a Termination Fee Under Specified Circumstances (see page 72)"
 
NxStage May be Required to Pay a Termination Fee Under Specified Circumstances (see page 72)
 
Under certain circumstances, we may be required to pay a termination fee to Mr. Utterberg up to an aggregate of $600,000 in reasonable documented expenses incurred by Mr. Utterberg relating to the Stock Purchase.
Comment:  link1 "U.S. Federal Income Tax Consequences of the Stock Purchase (see page 67)"
 
U.S. Federal Income Tax Consequences of the Stock Purchase (see page 67)
 
No gain or loss will be recognized by us or by holders of shares of our common stock as a result of the Stock Purchase.
Comment:  link1 "Anticipated Accounting Treatment"
 
Anticipated Accounting Treatment
 
We will account for the Stock Purchase as a purchase under U.S. generally accepted accounting principles, or GAAP. Under the purchase method of accounting, the assets and liabilities of the MDS Entities will be recorded as of the date of the closing of the Stock Purchase, at their respective fair values, and consolidated with those of NxStage. The results of operations of the MDS Entities will be consolidated with ours beginning on the date of the Stock Purchase.
Comment:  link1 "Share Ownership of Directors and Executive Officers of NxStage (see page 171)"
 
Share Ownership of Directors and Executive Officers of NxStage (see page 171)
 
At the close of business on the record date of our special meeting, our directors and executive officers and their affiliates, including Mr. Utterberg, beneficially owned and were entitled to vote approximately 32.5% of the shares of our common stock outstanding on that date.
Comment:  link1 "Regulatory Approvals (see page 67)"
 
Regulatory Approvals (see page 67)
 
We are not aware of any governmental or regulatory approval required for completion of the Stock Purchase, other than compliance with the Hart-Scott-Rodino Act, compliance with applicable corporate laws of Delaware, compliance with state securities laws and the filing with the NASDAQ Global Market of a Notification Form for Listing Additional Shares and a Notification Form for Change in the Number of Shares Outstanding, with respect to the shares of our common stock to be issued to Mr. Utterberg pursuant to the stock purchase agreement.
 
If any other governmental approvals or actions are required, we intend to try to obtain them. We cannot assure you, however, that we will be able to obtain any such approvals or actions.
Comment:  link1 "Appraisal Rights"
 
Appraisal Rights
 
Appraisal rights are not available under the Delaware General Corporation Law with respect to the Stock Purchase.


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Comment:  link1 "SUMMARY SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA OF NxSTAGE"
 
SUMMARY SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA OF NxSTAGE
 
The following tables present our summary selected consolidated statements of operations data and balance sheet data for our fiscal years 2002 through 2006 and for the six months ended June 30, 2006 and 2007. The selected financial data as of December 31, 2005 and 2006 and for the years ended December 31, 2004, 2005 and 2006 have been derived from our consolidated financial statements, which have been audited by Ernst & Young LLP, an independent registered public accounting firm, included in this proxy statement beginning on page F-16. The selected consolidated financial data as of December 31, 2002, 2003 and 2004 and for the years ended December 31, 2002 and 2003, are derived from our consolidated financial statements, which have been audited by Ernst & Young LLP, an independent registered accounting firm, not included in this proxy statement. The selected consolidated financial data as of June 30, 2007 and for the six months ended June 30, 2006 and 2007 are derived from our unaudited consolidated financial statements, which are included in this proxy statement beginning on page F-2. Our unaudited consolidated financial statements have been prepared on the same basis as the audited financial statements and notes thereto, and include, in the opinion of our management, all adjustments necessary for a fair presentation of the information for the unaudited interim period. Reclassifications have been made to our results from prior years to conform to the current presentation. You should read this information in conjunction with our consolidated financial statements, including the related notes, and “NxStage Management’s Discussion and Analysis of Financial Conditions and Results of Operations” included elsewhere in this proxy statement. The historical results are not necessarily indicative of results to be expected in any future period.
 
                                                         
    Historical  
          Six Months Ended
 
    Years Ended December 31,     June 30,  
    2002     2003     2004     2005     2006     2006     2007  
                                  (unaudited)  
    (In thousands, except share and per share data)  
Consolidated Statements of Operations Data:
                                                       
Revenues
  $ 30     $ 286     $ 1,885     $ 5,994     $ 20,812     $ 7,947     $ 18,405  
Cost of revenues
    404       940       3,439       9,585       26,121       10,861       21,428  
                                                         
Gross profit (deficit)
    (374 )     (654 )     (1,554 )     (3,591 )     (5,309 )     (2,914 )     (3,023 )
                                                         
Operating expenses:
                                                       
Selling and marketing
    2,286       2,181       3,334       7,550       14,356       6,952       9,851  
Research and development
    5,913       4,526       5,970       6,305       6,431       3,355       2,854  
Distribution
    6       33       495       2,059       7,093       2,808       5,342  
General and administrative
    2,554       2,868       3,604       4,855       8,703       4,124       5,193  
                                                         
Total operating expenses
    10,759       9,608       13,403       20,769       36,583       17,239       23,240  
                                                         
Loss from operations
    (11,133 )     (10,262 )     (14,957 )     (24,360 )     (41,892 )     (20,153 )     (26,263 )
Interest and other income
    222       146       130       643       3,236       1,203       1,736  
Interest and other expense
    (69 )     (92 )     (15 )     (763 )     (973 )     (694 )     (348 )
                                                         
Net loss
  $ (10,980 )   $ (10,208 )   $ (14,842 )   $ (24,480 )   $ (39,629 )   $ (19,643 )   $ (24,875 )
                                                         
Basic and diluted net loss per share
  $ (4.66 )   $ (4.10 )   $ (5.81 )   $ (4.31 )   $ (1.60 )   $ (0.90 )   $ (0.84 )
                                                         
Shares used in per share calculations
    2,355,527       2,489,688       2,555,605       5,680,566       24,817,020       21,815,098       29,488,097  
                                                         
 
                                                         
    As of December 31,     As of
 
    2002     2003     2004     2005     2006     June 30, 2007  
                                        (unaudited)  
    (In thousands)  
Balance Sheet Data:
                                                       
Cash, cash equivalents and short-term investments
  $ 4,028     $ 8,881     $ 18,134     $ 61,223     $ 61,802                      $ 52,967  
Working capital
    5,235       11,115       19,205       62,101       64,715               56,862  
Total assets
    7,983       13,613       25,455       76,575       101,725               113,169  
Long-term liabilities
    146       30       3,006       2,106       5,494               17,158  
Redeemable preferred stock
    40,006       55,946       75,946                            
Accumulated deficit
    (34,368 )     (44,623 )     (59,496 )     (84,011 )     (123,640 )             (148,516 )
Total stockholders’ equity (deficit)
    (33,271 )     (43,478 )     (57,400 )     67,354       83,408               78,273  


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Comment:  link1 "SUMMARY SELECTED HISTORICAL COMBINED FINANCIAL DATA OF MEDISYSTEMS GROUP"
 
SUMMARY SELECTED HISTORICAL COMBINED
FINANCIAL DATA OF MEDISYSTEMS GROUP
 
The following tables present a summary of the Medisystems Group combined statements of operations data and balance sheet data for its fiscal years 2002 through 2006 and for the six months ended June 30, 2006 and 2007. The selected financial data as of December 31, 2005 and 2006 and for the years ended December 31, 2004, 2005 and 2006 have been derived from the audited combined financial statements of the Medisystems Group, which have been audited by Grant Thornton LLP, an independent registered public accounting firm, and are included in this proxy statement beginning on page F-42. The selected combined financial data as of December 31, 2004 have been derived from the audited combined financial statements of the Medisystems Group, which have been audited by Grant Thornton LLP, an independent registered public accounting firm, not included in this proxy statement. The selected financial data as of December 31, 2002 and 2003 and for the years ended December 31, 2002 and 2003, are derived from the audited combined financial statements of the Medisystems Group, which have been audited by another independent registered public accounting firm, not included in this proxy statement. The selected combined financial data as of June 30, 2007 and for the six months ended June 30, 2006 and 2007 are derived from Medisystems Group unaudited combined financial statements, which are included in this proxy statement beginning on page F-42. The unaudited combined financial statements of the Medisystems Group have been prepared on the same basis as the audited financial statements and notes thereto, and include, in the opinion of the management of the Medisystems Group companies, all normal recurring adjustments necessary for a fair presentation of the information for the unaudited interim period. Reclassifications have been made to results from prior years to conform to the current presentation. These interim results are not necessarily an indication of the results for the full year. You should read this information in conjunction with the combined financial statements of the Medisystems Group, including the related notes, and “Medisystems Management’s Discussion and Analysis of Financial Conditions and Results of Operations” included elsewhere in this proxy statement. The historical results are not necessarily indicative of results to be expected in any future period.
 
                                                         
    Historical  
          Six Months Ended
 
    Years Ended December 31,     June 30,  
    2002     2003     2004     2005     2006     2006     2007  
                                  (unaudited)  
    (In thousands)  
 
Combined Statements of Operations Data:
                                                       
Revenues
  $ 83,515     $ 53,645     $ 62,848     $ 57,904     $ 62,577     $ 30,565     $ 32,028  
Cost of revenues
    59,358       41,608       46,653       44,227       47,782       23,119       23,275  
                                                         
Gross profit
    24,157       12,037       16,195       13,677       14,795       7,446       8,753  
                                                         
Operating expenses:
                                                       
Selling and marketing
    2,589       1,835       1,916       2,175       2,280       1,278       922  
Research and development
    1,686       1,464       1,638       2,186       2,317       1,103       877  
Distribution
    1,488       975       1,172       1,187       1,238       684       491  
General and administrative
    4,594       6,442       7,719       4,540       4,382       1,867       1,779  
Royalty Expense
    7,350       4,350       4,350       4,350       4,350       2,175       2,661  
                                                         
Total operating expenses
    17,707       15,066       16,795       14,438       14,567       7,107       6,730  
                                                         
Income from operations
    6,450       (3,029 )     (600 )     (761 )     228       339       2,023  
Legal settlement
                            5,629              
Interest and other income
    691       214       416       324       284       140       149  
Interest and other expense
    (10 )     (43 )     (29 )     (5 )     (251 )     (199 )     (109 )
                                                         
Income (loss) before provision for foreign income taxes
    7,131       (2,858 )     (213 )     (442 )     5,890       280       2,063  
Provision for foreign income taxes
    (206 )     (261 )     (140 )     (175 )     (199 )     (91 )     (126 )
                                                         
Net income (loss)
  $ 6,925     $ (3,119 )   $ (353 )   $ (617 )   $ 5,691     $ 189     $ 1,937  
                                                         


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    Historical  
          As of
 
    As of December 31,     June 30,  
    2002     2003     2004     2005     2006     2007  
    (In thousands)  
                                  (unaudited)  
 
Balance Sheet Data:
                                               
Cash, cash equivalents and short-term investments
  $ 5,060     $ 4,396     $ 2,918     $ 2,501     $ 1,622     $ 941  
Working capital
    3,190       (2,430 )     (6,006 )     (6,640 )     (1,536 )     (137 )
Total assets
    25,203       17,613       17,495       15,688       25,000       19,973  
Long-term liabilities
    524       641       778       725       785       773  
Retained earnings (deficit)
    7,325       206       (4,208 )     (4,825 )     866       2,543  
Total stockholders’ equity (deficit)
    7,484       509       (3,818 )     (4,608 )     1,272       2,954  


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Comment:  link1 "SUMMARY SELECTED UNAUDITED PRO FORMA COMBINED FINANCIAL DATA"
 
SUMMARY SELECTED UNAUDITED PRO FORMA COMBINED
FINANCIAL DATA
 
In accordance with Article 11 of Regulation S-X under the Securities Act of 1933, as amended, we have prepared a combined pro forma balance sheet as of June 30, 2007 and combined pro forma statements of operations for the six months ended June 30, 2007 and the fiscal year ended December 31, 2006. For additional information, please refer to the unaudited pro forma combined financial statements and related notes beginning on page 131.
 
The following tables present our summary historical and pro forma statement of operations data for the six months ended June 30, 2007 and for the year ended December 31, 2006 and our summary historical and pro forma balance sheet data as of June 30, 2007. The summary statements of operations data for the year ended December 31, 2006 are derived from our audited consolidated financial statements included in this proxy statement beginning on page F-17. The summary statements of operations data for the six months ended June 30, 2007 and the selected balance sheet data as of June 30, 2007 have been derived from our unaudited consolidated financial statements included in this proxy statement beginning on page F-2. Our unaudited consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and notes thereto, and include, in the opinion of our management, all adjustments necessary for a fair presentation of the information for the unaudited interim period. Our historical results for prior interim periods are not necessarily indicative of results to be expected for a full fiscal year or for any future period. You should read this data together with our financial statements and related notes included in this proxy statement beginning on page F-2 and the information under “Summary Selected Historical Consolidated Financial Data of NxStage,” “Summary Selected Historical Combined Financial Data of Medisystems Group,” “NxStage Management’s Discussion and Analysis of Financial Conditions and Results of Operations” and “Medisystems Management’s Discussion and Analysis of Financial Conditions and Results of Operations.”
 
The following unaudited pro forma combined financial data should be read in conjunction with our audited and unaudited historical financial statements and those of the Medisystems Group and the unaudited pro forma combined financial statements and related notes included in this proxy statement beginning on page 131. The unaudited pro forma combined financial data has been presented for illustrative purposes only and is not necessarily indicative of the results of operations or financial position that would have occurred if the transaction had been completed at the dates indicated.
 
                                 
          Unaudited  
          Pro Forma
             
          Combined
    NxStage Historical
    Pro Forma
 
    NxStage Historical
    Year Ended
    Six Months Ended
    Combined
 
    Year Ended December 31,     December 31,
    June 30,     Six Months Ended
 
    2006     2006     2007     June 30, 2007  
    (In thousands, except share and per share amounts)  
 
Combined Statements of Operations Data:
                               
Revenues
  $ 20,812     $ 78,886     $ 18,405     $ 46,744  
Cost of revenues
    26,121       69,917       21,428       41,193  
                                 
Gross profit (deficit)
    (5,309 )     8,969       (3,023 )     5,551  
                                 
Operating expenses;
                               
Selling and marketing
    14,356       16,636       9,852       10,774  
Research and development
    6,431       7,892       2,854       3,362  
Distribution
    7,093       8,331       5,341       5,832  
General and administrative
    8,703       15,359       5,193       8,336  
                                 
Total operating expenses
    36,583       48,218       23,240       28,304  
                                 


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          Unaudited  
          Pro Forma
             
          Combined
    NxStage Historical
    Pro Forma
 
    NxStage Historical
    Year Ended
    Six Months Ended
    Combined
 
    Year Ended December 31,     December 31,
    June 30,     Six Months Ended
 
    2006     2006     2007     June 30, 2007  
    (In thousands, except share and per share amounts)  
 
Loss from operations
    (41,892 )     (39,249 )     (26,263 )     (22,753 )
Interest and other income
    3,236       3,518       1,736       1,885  
Interest and other expense
    (973 )     (1,224 )     (348 )     (457 )
                                 
Loss before provision for foreign income taxes
    (39,629 )     (36,955 )     (24,875 )     (21,325 )
Provision for foreign income taxes
          199             (126 )
                                 
Net loss
  $ (39,629 )   $ (37,154 )   $ (24,875 )   $ (21,451 )
                                 
Basic and diluted net loss per share
  $ (1.60 )   $ (1.19 )   $ (0.84 )   $ (0.60 )
                                 
Shares used in per share calculations
    24,817,020       31,317,020       29,488,097       35,988,097  
                                 
 
                                 
    Unaudited              
    NxStage
    Pro Forma
             
    Historical
    Combined
             
    As of
    As of
             
    June 30, 2007     June 30, 2007              
    (in thousands)              
Balance Sheet Data:
                               
Cash, cash equivalents and short-term investments
  $ 52,967     $ 50,510                  
Working capital
    56,862       53,916                  
Total assets
    113,169       210,693                  
Long-term liabilities
    17,158       17,931                  
Accumulated deficit
    (148,516 )     (148,516 )                
Total stockholders’ equity
    78,273       159,523                  


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Comment:  link1 "COMPARATIVE HISTORICAL AND UNAUDITED PRO FORMA PER SHARE DATA"
 
COMPARATIVE HISTORICAL AND UNAUDITED PRO FORMA PER SHARE DATA
 
The information below reflects the historical net loss and net book value per share of our common stock in comparison with the unaudited pro forma net loss and book value per share after giving effect to the acquisition of the MDS Entities on a purchase basis.
 
You should read the tables below in conjunction with the audited and unaudited financial statements of NxStage beginning on page F-2 and the audited and unaudited financial statements of the Medisystems Group beginning on page F-42 and the related notes and the unaudited pro forma combined financial statements and related notes included elsewhere in this proxy statement.
 
         
    Six Months
 
    Ended
 
    June 30,
 
    2007  
 
NxStage
       
Historical Per Common Share Data:
       
Net loss per common share — basic and diluted weighted-average shares outstanding
  $ (0.84 )
Net book value per share outstanding
  $ 2.61  
NxStage and MDS Entities
       
Unaudited Pro Forma Combined Per Common Share Data:
       
Net loss per common share — basic and diluted weighted-average shares outstanding
  $ (0.60 )
Net book value per pro forma share outstanding
  $ 4.37  


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Comment:  link1 "MARKET PRICE AND DIVIDEND INFORMATION"
 
MARKET PRICE AND DIVIDEND INFORMATION
 
Our common stock has been quoted on the NASDAQ Global Market under the symbol “NXTM” since July 1, 2006, and prior to that it was quoted on the NASDAQ National Market from October 27, 2005 until June 30, 2006. Prior to that time, there was no public market for our common stock.
 
The following table sets forth the high and low intraday sales prices of our common stock as reported on the NASDAQ Global Market for each of the periods set forth below.
 
                 
    High     Low  
 
2007
               
First Quarter
  $ 14.20     $ 7.90  
Second Quarter
  $ 14.43     $ 11.46  
Third Quarter (through August 27, 2007)
  $ 13.97     $ 13.35  
2006
               
First Quarter
  $ 15.17     $ 11.50  
Second Quarter
  $ 13.33     $ 8.33  
Third Quarter
  $ 10.18     $ 7.11  
Fourth Quarter
  $ 9.80     $ 7.29  
2005
               
Fourth Quarter
  $ 14.80     $ 9.00  
 
The last reported sale price of our common stock on the NASDAQ Global Market on August 27, 2007 was $13.39 per share.
 
On July 31, 2007, the last trading day prior to announcement of the Stock Purchase, the closing price of our common stock was $12.11. Assuming the issuance of 6,500,000 shares of our common stock to Mr. Utterberg on June 4, 2007, he would have realized approximately $78.7 million in connection with the Stock Purchase. Because the market price of our common stock is subject to fluctuation, the value of the shares to be issued to Mr. Utterberg in the Stock Purchase may increase or decrease.
 
As of July 31, 2007, we had approximately 86 holders of record of our common stock. For detailed information regarding the beneficial ownership of our common stock see “NxStage Principal Stockholders.”
 
Market price data regarding the MDS Entities is not provided as there is no public market for their equity. See “Questions and Answers” for a summary of the ownership of the outstanding equity of the MDS Entities.
 
Given the absence of a public trading market for the outstanding equity of the MDS Entities, the foregoing per share market data may not provide meaningful information to you in determining whether to approve the issuance of the Stock Purchase Shares. Our stockholders are urged to obtain current market quotations for our common stock and to carefully review the other information contained in this proxy statement or incorporated herein by reference in considering whether to approve the issuance of the Stock Purchase Shares. See “Where you Can Find More Information” beginning on page 174.
 
Dividends
 
We have never declared or paid any dividends on our common stock. We currently intend to retain any future earnings to finance our research and development efforts, the development of our proprietary technologies and the expansion of our business and do not intend to declare or pay cash dividends on our capital stock in the foreseeable future. Any future determination to pay dividends will be at the discretion of our board of directors and will depend upon a number of factors, including our results of operations, financial condition, future prospects, contractual restrictions, restrictions imposed by applicable law and other factors our board of directors deems relevant.


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Certain of the MDS Entities, which are S corporations, have paid dividends to Mr. Utterberg for compensation and tax payment purposes; however, no such dividends were declared or paid to Mr. Utterberg during the years ended December 31, 2006 and December 31, 2005, during the six months ended June 30, 2007, or during the period between June 30, 2007 and July 31, 2007. Pursuant to the terms of the stock purchase agreement, Mr. Utterberg is permitted to receive cash dividends from the MDS Entities (1) in the amount of $55,000 per month for each month from January 1, 2007 through the closing of the Stock Purchase and (2) for reimbursement of tax liability with respect to Medisystems.


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Comment:  link1 "RISK FACTORS"
 
RISK FACTORS
 
In addition to the other information included in this proxy statement, including the matters addressed under “Special Note Regarding Forward-Looking Statements,” you should carefully consider the following risks before deciding whether to vote for the issuance of the shares of our common stock in the Stock Purchase or the increase in the number of shares issuable under our 2005 Plan. You should also consider the other information in this proxy statement and the other documents incorporated by reference into this proxy statement. See “Where You Can Find More Information.” Risks relating to NxStage’s business are described under “Risks Related to NxStage.” Risks relating to the Medisystems’ business are described under “Risks Related to the Combined Businesses Following the Stock Purchase.”
Comment:  link1 "Risks Related to the Stock Purchase"
 
Risks Related to the Stock Purchase
 
The number of shares of common stock to be issued as consideration for the Stock Purchase is not adjustable based on the market price of our common stock and if the market price of our common stock increases, the value of the shares of common stock issued as consideration for the Stock Purchase to Mr. Utterberg could increase.
 
The purchase price to be paid by us to Mr. Utterberg has been set in the stock purchase agreement at 6,500,000 shares of our common stock and is only adjustable upward or downward depending upon the amount of Medisystems working capital, as calculated pursuant to the stock purchase agreement, at the time of the closing; the number of shares of our common stock that we will issue will not be adjusted as a result of changes in the market price of our common stock. Any changes in the market price of our common stock will not affect the number of shares received by Mr. Utterberg as consideration for the Stock Purchase. Therefore, if the market price of our common stock increases from the market price on the date of the Stock Purchase, Mr. Utterberg would receive consideration with a market value that is higher than the value on the date we executed the stock purchase agreement or the date of this proxy statement.
 
If the working capital of Medisystems at the closing is less negative than the target amount of working capital by $250,000 or more or we are required to indemnify Mr. Utterberg for breaches or failures under the stock purchase agreement or consulting agreement, the number of shares to be issued to Mr. Utterberg will be increased.
 
The stock purchase agreement provides that, if the working capital of Medisystems at the closing is less negative than the target amount of working capital, as determined pursuant to the stock purchase agreement, by $250,000 or more, the number of shares of our common stock to be issued to Mr. Utterberg will be increased. The items that will constitute Medisystems’ working capital at the closing are subject to many factors. For a more detailed discussion of the calculation of Medisystems’ working capital at the closing, see “The Stock Purchase — Stock Purchase Consideration — Working Capital Adjustment Following Closing” on page 66.
 
If we are required to indemnify Mr. Utterberg for failures or breaches under the stock purchase agreement or consulting agreement, we will be required to satisfy any such indemnification obligations with shares of our common stock, valued at the time of payment. Our aggregate indemnification liability is generally limited to a maximum amount equal to 50% of the value of the shares issued as consideration for the Stock Purchase, measured at the time the Stock Purchase closes, minus $1,250,000. However, because any shares issued in satisfaction of an indemnification claim will be valued at the time of payment, we do not know the maximum number of shares that we may required to issue to Mr. Utterberg. For a more detailed discussion of the indemnification requirements under the stock purchase agreement and consulting agreement, see “The Stock Purchase Agreement — Indemnification” on page 74.


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Failure to complete the Stock Purchase could harm our common stock price and future business and operations.
 
If the Stock Purchase is not completed, we may be subject to the following risks:
 
  •  the price of our common stock may decline;
 
  •  we will not realize our expected benefits of the Stock Purchase;
 
  •  under certain circumstances we will be required to pay Mr. Utterberg a termination fee of up to $600,000 in reasonable documented expenses incurred by him in connection with the Stock Purchase; and
 
  •  the costs incurred by us related to the Stock Purchase, such as legal, accounting and certain financial advisory fees, must be paid even if the Stock Purchase is not completed.
 
The Stock Purchase may be completed even though material adverse changes may result from the announcement of the Stock Purchase, industry-wide changes and other causes.
 
In general, either party can refuse to complete the Stock Purchase if there is a material adverse change affecting the other party between June 4, 2007, the date of the stock purchase agreement, and the closing. However, certain types of changes do not permit either party to refuse to complete the Stock Purchase, even if such change would have a material adverse effect on us or Medisystems, including:
 
  •  with respect to us, changes resulting from general economic conditions or conditions generally affecting the industry in which we operate;
 
  •  changes due to the announcement of the Stock Purchase or the completion of the transactions contemplated by the stock purchase agreement; or
 
  •  changes resulting from a change in the price of our common stock excluding any underlying effect that may have caused such change.
 
If adverse changes occur but we and Mr. Utterberg must still complete the Stock Purchase, our stock price may suffer.
 
Medisystems’ KeyBank Credit Commitment is with all entities within the Medisystems Group, and it is not a condition to closing that this be modified. If the parties to the agreement are not limited to the MDS Entities, Medisystems Group companies that are not MDS Entities could borrow under the KeyBank commitment, and we could be required to pay.
 
In January 2003, the Medisystems Group entered into a credit agreement with KeyBank National Association, or KeyBank, pursuant to which all of the assets of each Medisystems Group company, including the assets of the MDS Entities, were pledged as collateral. The credit agreement provides for a $3.5 million revolving line of credit and a $1.5 million demand line of credit. As of July 25, 2007, there were no amounts outstanding under the revolving line of credit and Medisystems Group had issued approximately $812,000 of standby letters of credit, which are securing guarantees of VAT refunds made to MDS Italy by an Italian bank. Medisystems has indicated that it will amend the KeyBank credit commitment prior to the closing of the Stock Purchase to remove from the commitment the Medisystems Group companies that we are not acquiring. However, removal of these entities from the KeyBank credit commitment is not within our control and is not a condition to closing. While they remain parties to the credit commitment, Medisystems Group companies that are not MDS Entities may borrow under the credit facility, and, if they default on any such obligations, we could be required to satisfy the obligations.


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The market price of our common stock may decline as a result of the Stock Purchase.
 
The market price of our common stock may decline as a result of the Stock Purchase for a number of reasons including if:
 
  •  we do not achieve the perceived benefits of the Stock Purchase as rapidly or to the extent anticipated by financial or industry analysts;
 
  •  the effect of the Stock Purchase on our business and prospects is not consistent with the expectations of financial or industry analysts; or
 
  •  investors react negatively to the effect on our business and prospects from the Stock Purchase.
 
Our stockholders may not realize a benefit from the Stock Purchase commensurate with the ownership dilution they will experience in connection with the Stock Purchase.
 
As consideration for the Stock Purchase, we expect to issue 6,500,000 shares of our common stock, or approximately 21.7% of our outstanding common stock as of July 31, 2007. If we are unable to realize the strategic and financial benefits currently anticipated from the Stock Purchase, our stockholders will have experienced substantial dilution of their ownership interest without receiving commensurate benefit.
Comment:  link1 "Risks Related to NxStage"
 
Risks Related to NxStage
 
In addition to the other information contained in this proxy statement and the other risk factors set forth herein, you should carefully consider the following risks relating to NxStage’s business.
 
Risks Related to NxStage’s Business
 
We expect to derive substantially all of our future revenues from the rental or sale of our System One and the sale of our related disposable products used with the System One.
 
Since our inception, we have devoted substantially all of our efforts to the development of the System One and the related products used with the System One. We commenced marketing the System One and the related disposable products to the critical care market in February 2003. We commenced marketing the System One for chronic hemodialysis treatment in September 2004. We expect that the rental or sale of the System One and the sale of related products will account for substantially all of our revenues for the foreseeable future. Most of our related products cannot be used with any other dialysis systems and, therefore, we will derive little or no revenues from related products unless we sell or otherwise place the System One. To the extent that the System One is not a successful product or is withdrawn from the market for any reason, we do not have other products in development that could replace revenues from the System One.
 
We cannot accurately predict the size of the home hemodialysis market, and it may be smaller or slower to develop than we expect.
 
Although home hemodialysis treatment options are available, adoption has been limited. The most widely adopted form of dialysis therapy used in a setting other than a dialysis clinic is peritoneal dialysis. Based on the most recently available data from the United States Renal Data System, or USRDS, the number of patients receiving peritoneal dialysis was approximately 26,000 in 2004, representing approximately 8% of all patients receiving dialysis treatment for ESRD in the United States. Very few ESRD patients receive hemodialysis treatment outside of the clinic setting; USRDS data indicates approximately 2,000 patients were receiving home-based hemodialysis in 2004. Because the adoption of home hemodialysis has been limited to date, the number of patients who desire to, and are capable of, administering their own hemodialysis treatment with a system such as the System One is unknown and there is limited data upon which to make estimates. Our long-term growth will depend on the number of patients who adopt home-based hemodialysis and how quickly they adopt it, and we do not know whether the number of home-based dialysis patients will be greater or fewer than the number of patients performing peritoneal dialysis or how many peritoneal dialysis patients will switch to home-based hemodialysis. We received our home use clearance for the System One from the FDA in June


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2005 and we will need to devote significant resources to developing the market. We cannot be certain that this market will develop, how quickly it will develop or how large it will be.
 
We will require significant capital to build our business, and financing may not be available to us on reasonable terms, if at all.
 
We believe that the chronic care market is the largest market opportunity for our System One hemodialysis system. Historically, we have typically billed the dialysis clinic for the rental of the equipment and the sale of the related disposable cartridges and treatment fluids. In our recent DaVita agreement, DaVita agreed to purchase all of its System One equipment then being rented from us and to buy a significant percentage of its future System One equipment needs. It is not clear what percentage of our future chronic customers will purchase rather than rent System One equipment. However, it is possible that a significant percentage of our chronic customers will continue to rent rather than purchase System One equipment and that, as a result, we will generate a significant percentage of our revenues and cash flow from the use of the System One over time rather than upfront from the sale of the System One equipment. In this event, we will need significant amounts of working capital to manufacture System One equipment for rental to dialysis clinics.
 
We only recently began marketing our System One to dialysis clinics for the treatment of ESRD, and we have not achieved widespread market acceptance of our product. We may not be able to generate sufficient cash flow to meet our capital needs. If our existing resources are insufficient to satisfy our liquidity requirements, we may need to sell additional equity or issue debt securities. Any sale of additional equity or issuance of debt securities may result in dilution to our stockholders, and we cannot be certain that additional public or private financing will be available in amounts or on terms acceptable to us, or at all. If we are unable to obtain this additional financing when needed, we may be required to delay, reduce the scope of, or eliminate one or more aspects of our business development activities, which could harm the growth of our business.
 
We have limited operating experience, a history of net losses and an accumulated deficit of $148.5 million at June 30, 2007. We cannot guarantee if, when and the extent that we will become profitable, or that we will be able to maintain profitability once it is achieved.
 
Since inception, we have incurred losses every quarter and at June 30, 2007, we had an accumulated deficit of approximately $(148.5) million. We expect to incur increasing operating expenses as we continue to grow our business. Additionally, in the chronic care market, the cost of manufacturing the System One and related disposables currently exceeds the market price. We cannot provide assurance that we will be able to lower the cost of manufacturing the System One and related disposables below the current chronic care market price, that we will achieve profitability, when we will become profitable, the sustainability of profitability should it occur, or the extent to which we will be profitable. Our ability to become profitable is dependent in part upon achieving a sufficient scale of operations, obtaining better purchasing terms and prices, achieving efficiencies in manufacturing overhead costs, implementing design and process improvements to lower our costs of manufacturing our products and achieving efficient distribution of our products.
 
In March 2006, we received clearance from the FDA to market our PureFlow SL module as an alternative to the bagged fluid presently used with our System One in the chronic care market, and we commercially launched the PureFlow SL module in July 2006. This accessory to the System One allows for the preparation of high purity dialysate in the patient’s home using ordinary tap water and dialysate concentrate. The PureFlow SL is designed to help patients with ESRD more conveniently and effectively manage their home hemodialysis therapy by eliminating the need for bagged fluids. Since its launch, PureFlow SL penetration has reached approximately 58% of all of our chronic patients. The product is still early in its commercial launch and we continue to work to improve product reliability and user experience, based upon customer feedback. Any failure to further improve reliability and user experience, and thereby gain rapid market acceptance of the PureFlow SL module, including converting our installed base of patients currently using bagged fluid, could adversely affect our ability to achieve profitability.


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We compete against other dialysis equipment manufacturers with much greater financial resources and better established products and customer relationships, which may make it difficult for us to penetrate the market and achieve significant sales of our products.
 
Our System One competes directly against equipment produced by Fresenius Medical Care AG, Baxter Healthcare, Gambro AB, B. Braun and others, each of which markets one or more FDA-cleared medical devices for the treatment of acute or chronic kidney failure.
 
To date, only one other company has had a hemodialysis product specifically cleared for home use, Aksys Ltd., announced in January the withdrawal of its product from the market. Products sold by our other competitors have also been used in the home, in particular Fresenius systems. Each of these competitors offers products that have been in use for a longer time than our System One and are more widely recognized by physicians, patients and providers. These competitors have significantly more financial and human resources, more established sales, service and customer support infrastructures and spend more on product development and marketing than we do. Many of our competitors also have established relationships with the providers of dialysis therapy and, Fresenius owns and operates a chain of dialysis clinics. Most of these companies manufacture additional complementary products enabling them to offer a bundle of products and have established sales forces and distribution channels that may afford them a significant competitive advantage. One of our competitors, Gambro AB, has been subject to an import hold imposed by the FDA on its acute and chronic dialysis machines. This import hold has been recently lifted, and it is not yet clear what the chronic and acute market impact of this will be on our future revenues. We believe the overall impact of the import hold has been positive to us, however, we are not sure of the magnitude of the impact this import hold has had on revenues.
 
The market for our products is competitive, subject to change and affected by new product introductions and other market activities of industry participants, including increased consolidation of ownership of clinics by large dialysis chains. If we are successful, our competitors are likely to develop products that offer features and functionality similar to our System One. Improvements in existing competitive products or the introduction of new competitive products may make it more difficult for us to compete for sales, particularly if those competitive products demonstrate better safety, convenience or effectiveness or are offered at lower prices than our System One. Our ability to successfully market the System One could also be adversely affected by pharmacological and technological advances in preventing the progression of ESRD and/or in the treatment of acute kidney failure or fluid overload. If we are unable to compete effectively against existing and future competitors and existing and future alternative treatments and pharmacological and technological advances, it will be difficult for us to penetrate the market and achieve significant sales of the System One.
 
Our success will depend on our ability to achieve market acceptance of our System One.
 
Our products have limited product and brand recognition and have only been used at a limited number of dialysis clinics and hospitals. In the chronic care market, we will have to convince four distinct constituencies involved in the choice of dialysis therapy, namely operators of dialysis clinics, nephrologists, dialysis nurses and patients, that our system provides an effective alternative to other existing dialysis equipment. Each of these constituencies will use different considerations in reaching their decision. Lack of acceptance by any of these constituencies will make it difficult for us to grow our business. We may have difficulty gaining widespread or rapid acceptance of the System One for a number of reasons including:
 
  •  the failure by us to demonstrate to patients, operators of dialysis clinics, nephrologists, dialysis nurses and others that our product is equivalent or superior to existing therapy options or, that the cost or risk associated with use of our product is not greater than available alternatives;
 
  •  competition from products sold by companies with longer operating histories and greater financial resources, more recognizable brand names and better established distribution networks and relationships with dialysis clinics;
 
  •  the ownership and operation of some dialysis providers by companies that also manufacture and sell competitive dialysis products;


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  •  the introduction of competing products or treatments that may be more effective, safer, easier to use or less expensive than ours;
 
  •  the number of patients willing and able to perform therapy independently, outside of a traditional dialysis clinic, may be smaller than we estimate; and
 
  •  the continued availability of satisfactory reimbursement from healthcare payors, including Medicare.
 
Current Medicare reimbursement rates limit the price at which we can market the System One, and adverse changes to reimbursement could affect the adoption of the System One.
 
Our ability to attain profitability will be driven in part by our ability to set or maintain adequate pricing for our System One. As a result of legislation passed by the U.S. Congress more than 30 years ago, Medicare provides comprehensive and well-established reimbursement in the United States for ESRD. With over 80% of U.S. ESRD patients covered by Medicare, the reimbursement rate is an important factor in a potential customer’s decision to use the System One and limits the fee for which we can rent the System One and sell the related disposable cartridges and treatment fluids. Current CMS rules limit the number of hemodialysis treatments paid for by Medicare to three times a week, unless there is medical justification for additional treatments. Most patients using the System One in the home treat themselves, with the help of a partner, up to six times per week. To the extent that Medicare contractors elect not to pay for the additional treatments, adoption of the System One may be slowed. Changes in Medicare reimbursement rates could negatively affect demand for our products and the prices we charge for them.
 
As we continue to commercialize the System One and related products, we may have difficulty managing our growth and expanding our operations successfully.
 
As the commercial launch of the System One continues, we will need to expand our regulatory, manufacturing, sales and marketing and on-going development capabilities or contract with other organizations to provide these capabilities for us. As our operations expand, we expect that we will need to manage additional relationships with various partners, suppliers, manufacturers and other organizations. Our ability to manage our operations and growth requires us to continue to improve our operational, financial and management controls and reporting systems and procedures. Such growth could place a strain on our administrative and operational infrastructure. We may not be able to make improvements to our management information and control systems in an efficient or timely manner and may discover deficiencies in existing systems and controls.
 
If we are unable to improve on the product reliability performance typically experienced in the early stages of a product’s life cycle, our ability to grow our business and achieve profitability could be impaired.
 
Our System One is still early in its product launch, and our PureFlow SL module was only introduced during the third quarter of 2006. We continue to experience product reliability issues that are higher than we expect long-term, which lead us to incur increased service and distribution costs, as well as increase the size of our field equipment base. This, in turn, negatively impacts our gross margins and increases our working capital requirements. Additionally, product reliability issues can also lead to decreases in customer satisfaction and our ability to grow or maintain our revenues. We continue to work to improve product reliability, and have achieved some improvements to date. If we are unable to continue to improve product reliability, our ability to achieve our growth objectives as well as profitability could be significantly impaired.
 
Most recently, in the second quarter of 2007, we started to experience an increased incidence of reported dialysate leaks associated with our System One cartridges. The reported incidence of leaks is higher than we have historically observed. When the System One is used in accordance with its instructions, these leaks present no risk to patient health. System One device labeling anticipates the potential for leaks to occur and specifically warns against leaks and alerts users of the need to observe treatments in order to detect leaks. Four patients with reported leaks, that were unobserved by these patients or their partners until after their treatments were terminated, reported hypotension, or low blood pressure, resolved by a fluid bolus, with no


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lasting clinical effect. In early August 2007, we sent a letter to our patients and customers informing them of the increased incidence in leaks and reminding them of existing System One labeling alerting users of the potential for leaks and instructing them to observe treatments in order to detect any leaks. We have characterized this notification as a voluntary recall. On August 24, 2007, we elected to initiate a second step in our recall actions, and decided to physically recall the affected lots of cartridge inventory being held by chronic market customers and patients, and replace the affected inventory with newer lots of cartridges at no charge. We have instructed patients and customers to destroy all inventory of affected cartridges they have on hand, and we expect to write-off up to all of the inventory of affected cartridges we have in-house. It is possible that we may be able to rework this cartridge inventory, or reuse certain components of this inventory, but we have not made a final determination related to this recovery.
 
Based on these facts, we determined on August 24, 2007 that we would incur total charges in connection with this recall in the range of $1.9 million to $2.5 million, the principal component of which relates to the write-off of inventory in the range of $1.8 million to $2.2 million. Other charges primarily relate to increased shipping for replacement product and cycler servicing costs. Substantially all of these charges would be recorded in the quarter ending September 30, 2007.
 
The increased incidence in leaks has also been associated with increased cycler service requirements, which have led to increased service costs as well as imposed additional service pool requirements on our cycler inventory. In the short term, this may impede our ability to meet customer demand.
 
We have a significant amount of field equipment, and our ability to effectively manage this asset could negatively impact our working capital requirements and future profitability.
 
Because the majority of our chronic care business continues to rely upon an equipment rental model, our ability to manage System One equipment is important to minimizing our working capital requirements. In addition, our gross margins may be negatively impacted if we have excess equipment deployed, and unused, in the field. If we are unable to successfully track, service and redeploy equipment, we could (1) incur increased costs, (2) realize increased cash requirements and/or (3) have material write-offs of equipment.
 
Our agreement with DaVita confers certain geographic market rights to DaVita and limits our ability to sell the System One to Fresenius, both of which may present a barrier to adoption of the System One.
 
Fresenius and DaVita own and operate the two largest chains of dialysis clinics in the United States. Fresenius controls approximately 33% of the U.S. dialysis clinics and is the largest worldwide manufacturer of dialysis systems. DaVita controls approximately 27% of the U.S. dialysis clinics, and has entered into a preferred supplier agreement with Gambro pursuant to which Gambro will provide a significant majority of DaVita’s dialysis equipment and supplies for a period of at least 10 years. Each of Fresenius and DaVita may choose to offer their dialysis patients only the dialysis equipment manufactured by them or their affiliates, to offer the equipment they contractually agreed to offer or to otherwise limit access to the equipment manufactured by competitors.
 
Our recent agreement with DaVita confers certain market rights for the System One and related supplies for home hemodialysis therapy. DaVita is granted exclusive rights in a small percentage of geographies, which geographies collectively represent less than 10% of the U.S. ESRD patient population, and limited exclusivity in the majority of all other U.S. geographies, subject to DaVita’s meeting certain requirements, including patient volume commitments and new patient training rates. Under the agreement, we can continue to sell to other clinics in the majority of geographies. If certain minimum patient numbers or training rates are not achieved, DaVita can lose all or part of its preferred geographic rights. The agreement further limits, but does not prohibit, the sale by NxStage of the System One for chronic home patient hemodialysis therapy to any provider that is under common control or management of a parent entity that collectively provides dialysis services to more than 25% of U.S. chronic dialysis patients and that also supplies dialysis products. Therefore,


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our ability to sell the System One for chronic home patient hemodialysis therapy to Fresenius is presently limited.
 
It is not yet clear what impact this agreement may have on the market acceptance for our product. It is also not yet clear to what extent DaVita will purchase the System One from us. For the six months ended June 30, 2007, sales to DaVita represented 30% of our total revenues. Although we expect that DaVita will continue to be a significant customer of ours, the agreement imposes no purchase obligations upon DaVita and we cannot be certain whether DaVita will continue to purchase and/or rent the System One from us in the future. We believe that any future decision by DaVita to stop or limit the use of the System One would adversely affect our business, at least in the near term.
 
If kidney transplantation becomes a viable treatment option for more patients with ESRD, the market for our System One may be limited.
 
While kidney transplantation is the treatment of choice for most ESRD patients, it is not currently a viable treatment for most patients due to the limited number of donor kidneys, the high incidence of kidney transplant rejection and the higher surgical risk associated with older ESRD patients. According to the most recent USRDS data, in 2004 approximately 17,000 patients received kidney transplants in the United States. The development of new medications designed to reduce the incidence of kidney transplant rejection, progress in using kidneys harvested from genetically engineered animals as a source of transplants or any other advances in kidney transplantation could limit the market for our System One.
 
If we are unable to convince hospitals and healthcare providers of the benefits of our products for the treatment of acute kidney failure and fluid overload, we may not be successful in penetrating the critical care market.
 
We sell the System One for use in the treatment of acute kidney failure and fluid overload associated with, among other conditions, congestive heart failure. Physicians currently treat most acute kidney failure patients using conventional hemodialysis systems or dialysis systems designed specifically for use in the ICU. We will need to convince hospitals and healthcare providers that using the System One is as effective as using conventional hemodialysis systems or ICU specific dialysis systems for treating acute kidney failure and that it provides advantages over conventional systems or other ICU specific systems because of its significantly smaller size and ease of operation.
 
We are subject to the risk of costly and damaging product liability claims and may not be able to maintain sufficient product liability insurance to cover claims against us.
 
If our System One is found to have caused or contributed to injuries or deaths, we could be held liable for substantial damages. Claims of this nature may also adversely affect our reputation, which could damage our position in the market. As is the case with a number of other medical device companies, it is likely that product liability claims will be brought against us. Since their introduction into the market, our products have been subject to three voluntary recalls and one voluntary product withdrawal. Our first voluntary recall occurred in February 2001 in Canada and related to a software glitch that we detected in our predecessor system, which could have increased the likelihood of a clotted filter during treatment. There were no patient injuries associated with this recall, and the software glitch was remedied with a subsequent software release. The second voluntary recall occurred in April 2004 in the United States relating to pinhole-sized dialysate leaks in our cartridges. Although System One device labeling anticipates the potential for leaks to occur, and therefore specifically warns against leaks and alerts users of the need to check for leaks while performing treatments, the incidence of leaks was higher than we had historically experienced. There were no patient injuries associated with this recall; we subsequently switched suppliers and instituted additional testing requirements to minimize the chance for pinhole-sized leaks in our cartridges. Our third voluntary recall occurred in the United Sates in August 2007 and also related to pinhole-sized leaks in our cartridges. Four patients with reported leaks, that were unobserved by these patients or their partners until the end of their treatments, reported hypotension, or low blood pressure, resolved by a fluid bolus, with no lasting clinical effect. No other patient injuries were reported in connection with this recall. In response to this increased


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incidence in leaks, we are developing tests to better evaluate the susceptibility of cartridges to leaks prior to release, with the goal of reducing the chance for pinhole-sized leaks in our cartridges. The voluntary market withdrawal occurred in the United States in May 2002 when we suspended sales of our predecessor system while we addressed issues involving limited instances of contaminated hemofiltration fluids compounded by a pharmacy and supplied by a third-party. Six patients exposed to contaminated fluids reported fevers and/or chills, with no lasting clinical effect. We subsequently modified our cartridge to allow for an additional filter to remove contaminants from fluids used with our product. Our products may be subject to further recalls or withdrawals, which could increase the likelihood of product liability claims. We have also received several reports of operator error from both patients in the home hemodialysis setting and nurses in the critical care setting. We have sought to address many potential sources of operator error with product design changes to simplify the operator process. In addition, we have made improvements in our training materials and product labeling. However, instances of operator error cannot be eliminated and could also increase the likelihood of product liability claims.
 
Although we maintain insurance, including product liability insurance, we cannot provide assurance that any claim that may be brought against us will not result in court judgments or settlements in amounts that are in excess of the limits of our insurance coverage. Our insurance policies also have various exclusions, and we may be subject to a product liability claim for which we have no coverage. We will have to pay any amounts awarded by a court or negotiated in a settlement that exceed our coverage limitations or that are not covered by our insurance.
 
Any product liability claim brought against us, with or without merit, could result in the increase of our product liability insurance rates or the inability to secure additional insurance coverage in the future. A product liability claim, whether meritorious or not, could be time consuming, distracting and expensive to defend and could result in a diversion of management and financial resources away from our primary business, in which case our business may suffer.
 
We maintain insurance at levels deemed adequate by management, however, future claims could exceed our applicable insurance coverage.
 
We maintain insurance for property and general liability, directors’ and officers’ liability, workers compensation, and other coverage in amounts and on terms deemed adequate by management based on our expectations for future claims. Future claims could, however, exceed our applicable insurance coverage, or our coverage could not cover the applicable claims.
 
We have had limited sales, marketing, customer service and distribution experience. We need to expand our sales and marketing, customer service and distribution infrastructures to be successful in penetrating the dialysis market.
 
We currently market and sell the System One through our own sales force, and we have had limited experience in sales, marketing and distribution of dialysis products. As of July 31, 2007, we had 113 employees in our sales, marketing and distribution organization, including 31 direct sales representatives. We plan to expand our sales, marketing, customer service and distribution infrastructures. We cannot provide assurance that we will be able to retain or attract experienced personnel to our early-stage company and build an adequate sales and marketing, customer service and distribution staff or that the cost will not be prohibitive.
 
We face risks associated with having international manufacturing operations, and if we are unable to manage these risks effectively, our business could suffer.
 
In addition to our operations in Lawrence, Massachusetts, we operate manufacturing facilities in Rosdorf, Germany and Fresnillo, Mexico and we purchase components and supplies from foreign vendors. We are subject to a number of risks and challenges that specifically relate to these international operations, and we may not be successful if we are unable to meet and overcome these challenges. These risks include fluctuations in foreign currency exchange rates that may increase the U.S. dollar cost of the disposables we purchase from foreign third-party suppliers, costs associated with sourcing and shipping goods internationally,


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difficulty managing operations in multiple locations and local regulations that may restrict or impair our ability to conduct our operations.
 
Risks Related to the Proposed Acquisition of the Medisystems Entities and Other Possible Business Combinations
 
We may not complete the acquisition of the Medisystems entities and, the failure to do so, could harm our common stock price and future business and operations.
 
On June 4, 2007, we entered into a stock purchase agreement with David S. Utterberg to purchase his issued and outstanding shares of Medisystems Services Corporation, a Nevada corporation, Medisystems Corporation, a Washington corporation, Medisystems Europe S.p.A., a company organized under the laws of Italy, and Medimexico s. de R.L. de C.V., a company organized under the laws of Mexico, which we refer to collectively as the Medisystems entities. The proposed acquisition of the Medisystems entities is subject to a number of closing conditions, including approval of our stockholders, and may not be completed. If the acquisition is not completed, we may be subject to the following risks:
 
  •  the price of our common stock may decline;
 
  •  we will not realize our expected benefits of the acquisition;
 
  •  under certain circumstances we will be required to pay Mr. Utterberg a termination fee of up to $600,000 in reasonable documented expenses incurred by him in connection with the acquisition; and
 
  •  the costs incurred by us related to the acquisition, such as legal, accounting and certain financial advisory fees, must be paid even if the acquisition is not completed.
 
The market price of our common stock may decline as a result of the acquisition.
 
The market price of our common stock may decline as a result of the acquisition for a number of reasons including if:
 
  •  we do not achieve the perceived benefits of the acquisition as rapidly or to the extent anticipated by financial or industry analysts;
 
  •  the effect of the acquisition on our business and prospects is not consistent with the expectations of financial or industry analysts; or
 
  •  investors react negatively to the effect on our business and prospects from the acquisition.
 
Our stockholders may not realize a benefit from the acquisition commensurate with the ownership dilution they will experience in connection with the acquisition.
 
As consideration for the acquisition of the Medisystems entities, we expect to issue 6,500,000 shares of our common stock, or approximately 21.7% of our outstanding common stock as of July 31, 2007. If we are unable to realize the strategic and financial benefits currently anticipated from the acquisition, our stockholders will have experienced substantial dilution of their ownership interest without receiving commensurate benefit.
 
We may face challenges in integrating Medisystems’ business with NxStage’s and, as a result, may not realize the expected benefits of the proposed acquisition.
 
Even though NxStage’s and Medisystems’ businesses are relatively distinct, integrating the operations and personnel of Medisystems and NxStage will require a significant investment of management’s time and effort as well as the investment of capital, particularly with respect to information systems. The successful integration of Medisystems and NxStage will require, among other things, coordination of certain manufacturing operations and sales and marketing operations and the integration of Medisystems’ operations into the NxStage organization. The diversion of the attention of NxStage’s and Medisystems’ senior management and any difficulties encountered in the process of combining the companies could cause the disruption of, or a loss of momentum in, the activities of the combined businesses.


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The inability to successfully integrate the operations and personnel of Medisystems and NxStage, or any significant delay in achieving integration, could have a material adverse effect on the combined businesses after the completion of the acquisition, and, as a result, on the market price of NxStage’s common stock.
 
We may grow through additional acquisitions, which could dilute our existing shareholders and could involve substantial integration risks.
 
As part of our business strategy, we may acquire, in addition to our proposed acquisition of Medisystems, other businesses and technologies in the future. We may issue equity securities as consideration for future acquisitions that would dilute our existing stockholders, perhaps significantly depending on the terms of the acquisition. We may also incur additional debt in connection with future acquisitions, which, if available at all, may place additional restrictions on our ability to operate our business. Acquisitions may involve a number of risks, including:
 
  •  difficulty in transitioning and integrating the operations and personnel of the acquired businesses, including different and complex accounting and financial reporting systems;
 
  •  potential disruption of our ongoing business and distraction of management;
 
  •  potential difficulty in successfully implementing, upgrading and deploying in a timely and effective manner new operational information systems and upgrades of our finance, accounting and product distribution systems;
 
  •  difficulty in incorporating acquired technology and rights into our products and technology;
 
  •  unanticipated expenses and delays in completing acquired development projects and technology integration;
 
  •  management of geographically remote units both in the United States and internationally;
 
  •  impairment of relationships with partners and customers;
 
  •  customers delaying purchases of our products pending resolution of product integration between our existing and our newly acquired products;
 
  •  entering markets or types of businesses in which we have limited experience; and
 
  •  potential loss of key employees of the acquired company;
 
  •  Inaccurate assumptions of acquired company’s product quality and/or product reliability.
 
As a result of these and other risks, we may not realize anticipated benefits from our acquisitions. Any failure to achieve these benefits or failure to successfully integrate acquired businesses and technologies could seriously harm our business.
 
Purchase accounting treatment of acquisitions could decrease our net income in the foreseeable future, which could have a material and adverse effect on the market value of our common stock.
 
Under accounting principles generally accepted in the United States of America, we would account for acquisitions using the purchase method of accounting. Under purchase accounting, we would record the consideration issued in connection with the acquisition and the amount of direct transaction costs as the cost of acquiring the company or business. We would allocate that cost to the individual assets acquired and liabilities assumed, including various identifiable intangible assets such as acquired technology, acquired trade names and acquired customer relationships based on their respective fair values. Intangible assets generally will be amortized over a three to fifteen year period. Goodwill and certain intangible assets with indefinite lives are not subject to amortization but are subject to at least an annual impairment analysis, which may result in an impairment charge if the carrying value exceeds their implied fair value. These potential future amortization and impairment charges may significantly reduce net income, if any, and therefore may adversely affect the market value of our common stock.


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Risks Related to the Regulatory Environment
 
We are subject to significant regulation, primarily by the FDA. We cannot market or commercially distribute our products without obtaining and maintaining necessary regulatory clearances or approvals.
 
Our System One and related products, including the disposables required for its use, are all medical devices subject to extensive regulation in the United States, and in foreign markets we may wish to enter. To market a medical device in the United States, approval or clearance by the FDA is required, either through the pre-market approval process or the 510(k) clearance process. We have obtained the FDA clearances necessary to sell our current products under the 510(k) clearance process. Medical devices may only be promoted and sold for the indications for which they are approved or cleared. In addition, even if the FDA has approved or cleared a product, it can take action affecting such product approvals or clearances if serious safety or other problems develop in the marketplace. We may be required to obtain 510(k) clearances or pre-market approvals for additional products, product modifications, or for new indications for the System One. We cannot provide assurance that such clearances or approvals would be forthcoming, or, if forthcoming, what the timing and expense of obtaining such clearances or approvals might be. Delays in obtaining clearances or approvals could adversely affect our ability to introduce new products or modifications to our existing products in a timely manner, which would delay or prevent commercial sales of our products.
 
Modifications to our marketed devices may require new regulatory clearances or pre-market approvals, or may require us to cease marketing or recall the modified devices until clearances or approvals are obtained.
 
Any modifications to a 510(k) cleared device that could significantly affect its safety or effectiveness, or would constitute a major change in its intended use, requires the submission of another 510(k) pre-market notification to address the change. Although in the first instance we may determine that a change does not rise to a level of significance that would require us to make a pre-market notification submission, the FDA may disagree with us and can require us to submit a 510(k) for a significant change in the labeling, technology, performance specifications or materials or major change or modification in intended use, despite a documented rationale for not submitting a pre-market notification. We have modified various aspects of the System One and have filed and received clearance from the FDA with respect to some of the changes in the design of our products. If the FDA requires us to submit a 510(k) for any modification to a previously cleared device, or in the future a device that has received 510(k) clearance, we may be required to cease marketing the device, recall it, and not resume marketing until we obtain clearance from the FDA for the modified version of the device. Also, we may be subject to regulatory fines, penalties and/or other sanctions authorized by the Federal Food, Drug, and Cosmetic Act. In the future, we intend to introduce new products and enhancements and improvements to existing products. We cannot provide assurance that the FDA will clear any new product or product changes for marketing or what the timing of such clearances might be. In addition, new products or significantly modified marketed products could be found to be not substantially equivalent and classified as products requiring the FDA’s approval of a pre-market approval application, or PMA, before commercial distribution would be permissible. PMAs usually require substantially more data than 510(k) submissions and their review and approval or denial typically takes significantly longer than a 510(k) decision of substantial equivalence. Also, PMA products require approval supplements for any change that affects safety and effectiveness before the modified device may be marketed. Delays in our receipt of regulatory clearance or approval will cause delays in our ability to sell our products, which will have a negative effect on our revenues growth.
 
Even if we obtain the necessary FDA clearances or approvals, if we or our suppliers fail to comply with ongoing regulatory requirements our products could be subject to restrictions or withdrawal from the market.
 
We are subject to the Medical Device Reporting, or MDR, regulations that require us to report to the FDA if our products may have caused or contributed to patient death or serious injury, or if our device malfunctions and a recurrence of the malfunction would likely result in a death or serious injury. We must also file reports of device corrections and removals and adhere to the FDA’s rules on labeling and promotion.


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Our failure to comply with these or other applicable regulatory requirements could result in enforcement action by the FDA, which may include any of the following:
 
  •  untitled letters, warning letters, fines, injunctions and civil penalties;
 
  •  administrative detention, which is the detention by the FDA of medical devices believed to be adulterated or misbranded;
 
  •  customer notification, or orders for repair, replacement or refund;
 
  •  voluntary or mandatory recall or seizure of our products;
 
  •  operating restrictions, partial suspension or total shutdown of production;
 
  •  refusal to review pre-market notification or pre-market approval submissions;
 
  •  rescission of a substantial equivalence order or suspension or withdrawal of a pre-market approval; and
 
  •  criminal prosecution.
 
Our products are subject to market withdrawals or product recalls after receiving FDA clearance or approval, and market withdrawals and product recalls could cause the price of our stock to decline and expose us to product liability or other claims or could otherwise harm our reputation and financial results.
 
Complex medical devices, such as the System One, can experience performance problems in the field that require review and possible corrective action by us or the product manufacturer. We cannot provide assurance that component failures, manufacturing errors, design defects and/or labeling inadequacies, which could result in an unsafe condition or injury to the operator or the patient will not occur. These could lead to a government mandated or voluntary recall by us. The FDA has the authority to require the recall of our products in the event a product presents a reasonable probability that it would cause serious adverse health consequences or death. Similar regulatory agencies in other countries have similar authority to recall devices because of material deficiencies or defects in design or manufacture that could endanger health. We believe that the FDA would request that we initiate a voluntary recall if a product was defective or presented a risk of injury or gross deception. Any recall could divert management attention and financial resources, could cause the price of our stock to decline and expose us to product liability or other claims and harm our reputation with customers. Recalls, involving the System One, depending upon the nature and scope of the recall, may be particularly harmful to our business and financial results, because the System One is our primary product. We will incur costs in connection with our August 2007 voluntary recall relating to the increased incidence of reported cartridge leaks in the range of $1.9 million to $2.5 million, primarily associated with the write-off of affected inventory. The leaks associated with this recall have also led to customer dissatisfaction which, in the short term, could impair our future growth.
 
If we or our contract manufacturers fail to comply with FDA’s Quality System regulations, our manufacturing operations could be interrupted, and our product sales and operating results could suffer.
 
Our finished goods manufacturing processes, and those of some of our contract manufacturers, are required to comply with the FDA’s Quality System regulations, or QSRs, which cover the procedures and documentation of the design, testing, production, control, quality assurance, labeling, packaging, sterilization, storage and shipping of our devices. The FDA enforces its QSRs through periodic unannounced inspections of manufacturing facilities. We and our contract manufacturers have been, and anticipate in the future being, subject to such inspections. Our U.S. manufacturing facility has previously had three FDA QSR inspections. The first resulted in one observation, which was rectified during the inspection and required no further response from us. Our last two inspections, including our most recent inspection in March 2006, resulted in no observations. We cannot provide assurance that any future inspections would have the same result. If one of our manufacturing facilities or those of any of our contract manufacturers fails to take satisfactory corrective action in response to an adverse QSR inspection, FDA could take enforcement action, including issuing a public warning letter, shutting down our manufacturing operations, embargoing the import of components from


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outside of the United States, recalling our products, refusing to approve new marketing applications, instituting legal proceedings to detain or seize products or imposing civil or criminal penalties or other sanctions, any of which could cause our business and operating results to suffer.
 
Changes in reimbursement for treatment for ESRD could affect the adoption of our System One and the level of our future product revenues.
 
In the United States, all patients who suffer from ESRD, regardless of age, are eligible for coverage under Medicare, after a requisite coordination period if other insurance is available. As a result, more than 80% of patients with ESRD are covered by Medicare. Although we rent and sell our products to hospitals, dialysis centers and other healthcare providers and not directly to patients, the reimbursement rate for ESRD treatments is an important factor in a potential customer’s decision to purchase the System One. The dialysis centers that purchase our product rely on adequate third-party payor coverage and reimbursement to maintain their ESRD facilities. The CMS provides the composite rate for dialysis services, which is subject to regional variation and varies depending upon whether the facility is hospital-based or an independent clinic. The composite rate is intended to cover most items and services related to the treatment of ESRD, but does not include payment for physician services or separately billable laboratory services or drugs. Changes in Medicare reimbursement rates could negatively affect demand for our products and the prices we charge for them.
 
Most ESRD patients who use our product for dialysis therapy in the home treat themselves six times per week. CMS rules, however, limit the number of hemodialysis treatments paid for by Medicare to three a week, unless there is medical justification for the additional treatments. The determination of medical justification must be made at the local Medicare contractor level on a case-by-case basis. If daily therapy is prescribed, a clinic’s decision as to how much it is willing to spend on dialysis equipment and services will be at least partly dependent on whether Medicare will reimburse more than three treatments per week for the clinic’s patients.
 
Unlike Medicare reimbursement for ESRD, Medicare only reimburses healthcare providers for acute kidney failure and fluid overload treatment if the patient is otherwise eligible for Medicare, based on age or disability. Medicare and many other third-party payors and private insurers reimburse these treatments provided to hospital inpatients under a traditional DRG system. Under this system, reimbursement is determined based on a patient’s primary diagnosis and is intended to cover all costs of treating the patient. The presence of acute kidney failure or fluid overload increases the severity of the primary diagnosis and, accordingly, may increase the amount reimbursed. For care of these patients to be cost-effective, hospitals must manage the longer hospitalization stays and significantly more nursing time typically necessary for patients with acute kidney failure and fluid overload. If we are unable to convince hospitals that our System One provides a cost-effective treatment alternative under this diagnosis related group reimbursement system, they may not purchase our product. In addition, changes in Medicare reimbursement rates for hospitals could negatively affect demand for our products and the prices we charge for them.
 
Legislative or regulatory reform of the healthcare system may affect our ability to sell our products profitably.
 
In both the United States and foreign countries, there have been legislative and regulatory proposals to change the healthcare system in ways that could affect our ability to sell our products profitably. The federal government and some states have enacted healthcare reform legislation, and further federal and state proposals are likely. We cannot predict the exact form this legislation may take, the probability of passage, or the ultimate effect on us. Our business could be adversely affected by future healthcare reforms or changes in Medicare.
 
Failure to obtain regulatory approval in foreign jurisdictions would prevent us from marketing our products outside the United States.
 
Although we have not initiated any marketing efforts in jurisdictions outside of the United States and Canada, we intend in the future to market our products in other markets. In order to market our products in the European


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Union or other foreign jurisdictions, we must obtain separate regulatory approvals and comply with numerous and varying regulatory requirements. The approval procedure varies from country to country and can involve additional testing. The time required to obtain approval abroad may be longer than the time required to obtain FDA clearance. The foreign regulatory approval process includes many of the risks associated with obtaining FDA clearance and we may not obtain foreign regulatory approvals on a timely basis, if at all. FDA clearance does not ensure approval by regulatory authorities in other countries, and approval by one foreign regulatory authority does not ensure approval by regulatory authorities in other foreign countries. We may not be able to file for regulatory approvals and may not receive necessary approvals to commercialize our products in any market outside the United States, which could negatively effect our overall market penetration.
 
We currently have obligations under our contracts with dialysis clinics and hospitals to protect the privacy of patient health information.
 
In the course of performing our business we obtain, from time to time, confidential patient health information. For example, we learn patient names and addresses when we ship our System One supplies to home hemodialysis patients. We may learn patient names and be exposed to confidential patient health information when we provide training on System One operations to our customer’s staff. Our home hemodialysis patients may also call our customer service representatives directly and, during the call, disclose confidential patient health information. U.S. Federal and state laws protect the confidentiality of certain patient health information, in particular individually identifiable information, and restrict the use and disclosure of that information. At the federal level, the Department of Health and Human Services promulgated health information and privacy and security rules under the Health Insurance Portability and Accountability Act of 1996, or HIPAA. At this time, we are not a HIPAA covered entity and consequently are not directly subject to HIPAA. However, we have entered into several business associate agreements with covered entities that contain commitments to protect the privacy and security of patients’ health information and, in some instances, require that we indemnify the covered entity for any claim, liability, damage, cost or expense arising out of or in connection with a breach of the agreement by us. If we were to violate one of these agreements, we could lose customers and be exposed to liability and/or our reputation and business could be harmed. In addition, conduct by a person that is not a covered entity could potentially be prosecuted under aiding and abetting or conspiracy laws if there is an improper disclosure or misuse of patient information.
 
Many state laws apply to the use and disclosure of health information, which could affect the manner in which we conduct our business. Such laws are not necessarily preempted by HIPAA, in particular those laws that afford greater protection to the individual than does HIPAA. Such state laws typically have their own penalty provisions, which could be applied in the event of an unlawful action affecting health information.
 
We are subject to federal and state laws prohibiting “kickbacks” and false and fraudulent claims which, if violated, could subject us to substantial penalties. Additionally, any challenges to or investigation into our practices under these laws could cause adverse publicity and be costly to respond to, and thus could harm our business.
 
The Medicare/ Medicaid anti-kickback laws, and several similar state laws, prohibit payments that are intended to induce physicians or others either to refer patients or to acquire or arrange for or recommend the acquisition of healthcare products or services. These laws affect our sales, marketing and other promotional activities by limiting the kinds of financial arrangements, including sales programs, we may have with hospitals, physicians or other potential purchasers or users of medical devices. In particular, these laws influence, among other things, how we structure our sales and rental offerings, including discount practices, customer support, education and training programs and physician consulting and other service arrangements. Although we seek to structure such arrangements in compliance with applicable requirements, these laws are broadly written, and it is often difficult to determine precisely how these laws will be applied in specific circumstances. If one of our sales representatives were to offer an inappropriate inducement to purchase our System One to a customer, we could be subject to a claim under the Medicare/ Medicaid anti-kickback laws.
 
Other federal and state laws generally prohibit individuals or entities from knowingly presenting, or causing to be presented, claims for payments from Medicare, Medicaid or other third-party payors that are


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false or fraudulent, or for items or services that were not provided as claimed. Although we do not submit claims directly to payors, manufacturers can be held liable under these laws if they are deemed to “cause” the submission of false or fraudulent claims by providing inaccurate billing or coding information to customers, or through certain other activities. In providing billing and coding information to customers, we make every effort to ensure that the billing and coding information furnished is accurate and that treating physicians understand that they are responsible for all billing and prescribing decisions, including the decision as to whether to order dialysis services more frequently than three times per week. Nevertheless, we cannot provide assurance that the government will regard any billing errors that may be made as inadvertent or that the government will not examine our role in providing information to our customers concerning the benefits of daily therapy. Anti-kickback and false claims laws prescribe civil, criminal and administrative penalties for noncompliance, which can be substantial. Moreover, an unsuccessful challenge or investigation into our practices could cause adverse publicity, and be costly to respond to, and thus could harm our business and results of operations.
 
Foreign governments tend to impose strict price controls, which may adversely affect our future profitability.
 
Although we have not initiated any marketing efforts in jurisdictions outside of the United States and Canada, we intend in the future to market our products in other markets. In some foreign countries, particularly in the European Union, the pricing of medical devices is subject to governmental control. In these countries, pricing negotiations with governmental authorities can take considerable time after the receipt of marketing approval for a product. To obtain reimbursement or pricing approval in some countries, we may be required to supply data that compares the cost-effectiveness of the System One to other available therapies. If reimbursement of our products is unavailable or limited in scope or amount, or if pricing is set at unsatisfactory levels, it may not be profitable to sell our products outside of the United States, which would negatively affect the long-term growth of our business.
 
Our business activities involve the use of hazardous materials, which require compliance with environmental and occupational safety laws regulating the use of such materials. If we violate these laws, we could be subject to significant fines, liabilities or other adverse consequences.
 
Our research and development programs as well as our manufacturing operations involve the controlled use of hazardous materials. Accordingly, we are subject to federal, state and local laws governing the use, handling and disposal of these materials. Although we believe that our safety procedures for handling and disposing of these materials comply in all material respects with the standards prescribed by state and federal regulations, we cannot completely eliminate the risk of accidental contamination or injury from these materials. In the event of an accident or failure to comply with environmental laws, we could be held liable for resulting damages, and any such liability could exceed our insurance coverage.
 
Risks Related to Operations
 
We depend on the services of our senior executives and certain key engineering, scientific, clinical and marketing personnel, the loss of whom could negatively affect our business.
 
Our success depends upon the skills, experience and efforts of our senior executives and other key personnel, including our chief executive officer, certain members of our engineering staff, our marketing executives and managers, our manufacturing executives and managers and our clinical educators. Much of our corporate expertise is concentrated in relatively few employees, the loss of which for any reason could negatively affect our business. Competition for our highly skilled employees is intense and we cannot prevent the resignation of any employee. Virtually all of our employees have agreements which impose obligations that may prevent a former employee of ours from working for a competitor for a period of time; however, these clauses may not be enforceable, or enforceable only in part, or the company may choose not to seek enforcement. We do not maintain “key man” life insurance on any of our senior executives, other than our chief executive officer.


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We obtain some of the components, subassemblies and completed products included in the System One from a single source or a limited group of manufacturers or suppliers, and the partial or complete loss of one of these manufacturers or suppliers could cause significant production delays, an inability to meet customer demand and a substantial loss in revenues.
 
We depend on single source suppliers for some of the components and subassemblies we use in the System One. KMC Systems, Inc. is our only contract manufacturer of the System One cycler, although we are considering a plan to develop alternative manufacturing capabilities for this product; B. Braun Medizintechnologie GmbH is our only supplier of bicarbonate-based dialysate used with the System One; Membrana GmbH is our only supplier of the fiber used in our filters; PISA is our primary supplier of lactate-based dialysate; and Medisystems Corporation is the only supplier of our disposable cartridge and several cartridge components. Medisystems is a related party to NxStage. David Utterberg, the chief executive officer and sole stockholder of Medisystems, is a member of our board of directors and, at June 30, 2007, held approximately 6.7% of our common stock. We also obtain certain other components included in the System One from other single source suppliers or a limited group of suppliers. Our dependence on single source suppliers of components, subassemblies and finished goods exposes us to several risks, including disruptions in supply, price increases, late deliveries, and an inability to meet customer demand. This could lead to customer dissatisfaction, damage to our reputation, or customers switching to competitive products. Any interruption in supply could be particularly damaging to our customers using the System One to treat chronic ESRD and who need access to the System One and related disposables.
 
Finding alternative sources for these components and subassemblies would be difficult in many cases and may entail a significant amount of time and disruption. In the case of B. Braun, for bicarbonate, and Membrana, for fiber, we are contractually prevented from obtaining an alternative source of supply, except in certain limited instances. In the case of Medisystems, we are contractually prevented from obtaining an alternative source of supply for more than 10% of our North American requirements, except in certain limited instances. In the case of other suppliers, we would need to change the components or subassemblies if we sourced them from an alternative supplier. This, in turn, could require a redesign of our System One and, potentially, further FDA clearance or approval of any modification, thereby causing further costs and delays.
 
Certain of our products are recently developed or are transitioning to other locations and we, and certain of our third party manufacturers, have limited manufacturing experience with these products.
 
We continue to develop new products and make improvements to existing products. We are also expanding our manufacturing capacity which requires us to relocate our manufacturing operations to other locations. As such, we and certain of our third party manufacturers, have limited manufacturing experience with certain of our products, including key products such as the PureFlow SL and related disposables. We are, therefore, more exposed to risks relating to product quality and reliability until the manufacturing processes for these new products mature.
 
We do not have long-term supply contracts with many of our third-party suppliers.
 
We purchase components and subassemblies from third-party suppliers, including some of our single source suppliers, through purchase orders and do not have long-term supply contracts with many of these third-party suppliers. Many of our third-party suppliers, therefore, are not obligated to perform services or supply products to us for any specific period, in any specific quantity or at any specific price, except as may be provided in a particular purchase order.
 
We do not maintain large volumes of inventory from most of these suppliers. If we inaccurately forecast demand for components or subassemblies, our ability to manufacture and commercialize the System One could be delayed and our competitive position and reputation could be harmed. In addition, if we fail to effectively manage our relationships with these suppliers, we may be required to change suppliers which would be time consuming and could lead to disruptions in product supply, which could permanently impair our customer base and reputation.


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Risks Related to Intellectual Property
 
If we are unable to protect our intellectual property and prevent its use by third parties, we will lose a significant competitive advantage.
 
We rely on patent protection, as well as a combination of copyright, trade secret and trademark laws to protect our proprietary technology and prevent others from duplicating our products. However, these means may afford only limited protection and may not:
 
  •  prevent our competitors from duplicating our products;
 
  •  prevent our competitors from gaining access to our proprietary information and technology; or
 
  •  permit us to gain or maintain a competitive advantage.
 
Any of our patents may be challenged, invalidated, circumvented or rendered unenforceable. We cannot provide assurance that we will be successful should one or more of our patents be challenged for any reason. If our patent claims are rendered invalid or unenforceable, or narrowed in scope, the patent coverage afforded our products could be impaired, which could make our products less competitive.
 
As of June 30, 2007, we had 48 pending patent applications, including foreign, international and U.S. applications, and 27 U.S. and international issued patents. We cannot specify which of these patents individually or as a group will permit us to gain or maintain a competitive advantage. We cannot provide assurance that any pending or future patent applications we hold will result in an issued patent or that if patents are issued to us, that such patents will provide meaningful protection against competitors or against competitive technologies. The issuance of a patent is not conclusive as to its validity or enforceability. The United States federal courts or equivalent national courts or patent offices elsewhere may invalidate our patents or find them unenforceable. Competitors may also be able to design around our patents. Our patents and patent applications cover particular aspects of our products. Other parties may develop and obtain patent protection for more effective technologies, designs or methods for treating kidney failure. If these developments were to occur, it would likely have an adverse effect on our sales.
 
The laws of foreign countries may not protect our intellectual property rights effectively or to the same extent as the laws of the United States. If our intellectual property rights are not adequately protected, we may not be able to commercialize our technologies, products or services and our competitors could commercialize similar technologies, which could result in a decrease in our revenues and market share.
 
Our products could infringe the intellectual property rights of others, which may lead to litigation that could itself be costly, could result in the payment of substantial damages or royalties, and/or prevent us from using technology that is essential to our products.
 
The medical device industry in general has been characterized by extensive litigation and administrative proceedings regarding patent infringement and intellectual property rights. Products to provide kidney replacement therapy have been available in the market for more than 30 years and our competitors hold a significant number of patents relating to kidney replacement devices, therapies, products and supplies. Although no third party has threatened or alleged that our products or methods infringe their patents or other intellectual property rights, we cannot provide assurance that our products or methods do not infringe the patents or other intellectual property rights of third parties. If our business is successful, the possibility may increase that others will assert infringement claims against us.
 
Infringement and other intellectual property claims and proceedings brought against us, whether successful or not, could result in substantial costs and harm to our reputation. Such claims and proceedings can also distract and divert management and key personnel from other tasks important to the success of the business. In addition, intellectual property litigation or claims could force us to do one or more of the following:
 
  •  cease selling or using any of our products that incorporate the asserted intellectual property, which would adversely affect our revenues;
 
  •  pay substantial damages for past use of the asserted intellectual property;


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  •  obtain a license from the holder of the asserted intellectual property, which license may not be available on reasonable terms, if at all and which could reduce profitability; and
 
  •  redesign or rename, in the case of trademark claims, our products to avoid infringing the intellectual property rights of third parties, which may not be possible and could be costly and time-consuming if it is possible to do so.
 
Confidentiality agreements with employees and others may not adequately prevent disclosure of trade secrets and other proprietary information.
 
In order to protect our proprietary technology and processes, we also rely in part on confidentiality agreements with our corporate partners, employees, consultants, outside scientific collaborators and sponsored researchers, advisors and others. These agreements may not effectively prevent disclosure of confidential information and trade secrets and may not provide an adequate remedy in the event of unauthorized disclosure of confidential information. In addition, others may independently discover or reverse engineer trade secrets and proprietary information, and in such cases we could not assert any trade secret rights against such party. Costly and time consuming litigation could be necessary to enforce and determine the scope of our proprietary rights, and failure to obtain or maintain trade secret protection could adversely affect our competitive position.
 
We may be subject to damages resulting from claims that our employees or we have wrongfully used or disclosed alleged trade secrets of other companies.
 
Many of our employees were previously employed at other medical device companies focused on the development of dialysis products, including our competitors. Although no claims against us are currently pending, we may be subject to claims that these employees or we have inadvertently or otherwise used or disclosed trade secrets or other proprietary information of their former employers. Litigation may be necessary to defend against these claims. If we fail in defending such claims, in addition to paying monetary damages, we may lose valuable intellectual property rights. Even if we are successful in defending against these claims, litigation could result in substantial costs, damage to our reputation and be a distraction to management.
 
Risks Related to our Common Stock
 
Our stock price is likely to be volatile, and the market price of our common stock may drop.
 
The market price of our common stock could be subject to significant fluctuations. Market prices for securities of early stage companies have historically been particularly volatile. As a result of this volatility, you may not be able to sell your common stock at or above the price you paid for the stock. Some of the factors that may cause the market price of our common stock to fluctuate include:
 
  •  timing of market acceptance of our products;
 
  •  timing of achieving profitability and positive cash flow from operations;
 
  •  changes in estimates of our financial results or recommendations by securities analysts or the failure to meet or exceed securities analysts’ expectations;
 
  •  actual or anticipated variations in our quarterly operating results;
 
  •  disruptions in product supply for any reason, including product recalls of the failure of third party suppliers to needed products or components;
 
  •  reports by officials or health or medical authorities, the general media or the FDA regarding the potential benefits of the System One or of similar dialysis products distributed by other companies or of daily or home dialysis;
 
  •  announcements by the FDA of non-clearance or non-approval of our products, or delays in the FDA or other foreign regulatory agency review process;
 
  •  product recalls;


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  •  regulatory developments in the United States and foreign countries;
 
  •  changes in third-party healthcare reimbursements, particularly a decline in the level of Medicare reimbursement for dialysis treatments;
 
  •  litigation involving our company or our general industry or both;
 
  •  announcements of technical innovations or new products by us or our competitors;
 
  •  developments or disputes concerning our patents or other proprietary rights;
 
  •  our ability to manufacture and supply our products to commercial standards;
 
  •  significant acquisitions, strategic partnerships, joint ventures or capital commitments by us or our competitors;
 
  •  departures of key personnel; and
 
  •  investors’ general perception of our company, our products, the economy and general market conditions.
 
The stock markets in general have experienced substantial volatility that has often been unrelated to the operating performance of individual companies. These broad market fluctuations may adversely affect the trading price of our common stock.
 
In the past, following periods of volatility in the market price of a company’s securities, stockholders have often instituted class action securities litigation against those companies. Such litigation, if instituted, could result in substantial costs and diversion of management attention and resources, which could significantly harm our profitability and reputation.
 
Anti-takeover provisions in our restated certificate of incorporation and amended and restated bylaws and under Delaware law could make an acquisition of us more difficult and may prevent attempts by our stockholders to replace or remove our current management.
 
Provisions in our restated certificate of incorporation and our amended and restated bylaws may delay or prevent an acquisition of us. In addition, these provisions may frustrate or prevent attempts by our stockholders to replace or remove members of our board of directors. Because our board of directors is responsible for appointing the members of our management team, these provisions could in turn affect any attempt by our stockholders to replace current members of our management team. These provisions include:
 
  •  a prohibition on actions by our stockholders by written consent;
 
  •  the ability of our board of directors to issue preferred stock without stockholder approval, which could be used to institute a “poison pill” that would work to dilute the stock ownership of a potential hostile acquirer, effectively preventing acquisitions that have not been approved by our board of directors;
 
  •  advance notice requirements for nominations of directors or stockholder proposals; and
 
  •  the requirement that board vacancies be filled by a majority of our directors then in office.
 
In addition, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporation Law, which prohibits a person who owns in excess of 15% of our outstanding voting stock from merging or combining with us for a period of three years after the date of the transaction in which the person acquired in excess of 15% of our outstanding voting stock, unless the merger or combination is approved in a prescribed manner. These provisions would apply even if the offer may be considered beneficial by some stockholders.


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If there are substantial sales of our common stock in the market by our existing stockholders, our stock price could decline.
 
If our existing stockholders sell a large number of shares of our common stock or the public market perceives that existing stockholders might sell shares of common stock, the market price of our common stock could decline significantly. We have 29,995,126 shares of common stock outstanding as of July 31, 2007. Shares held by our affiliates may only be sold in compliance with the volume limitations of Rule 144. These volume limitations restrict the number of shares that may be sold by an affiliate in any three-month period to the greater of 1% of the number of shares then outstanding, which approximates 299,951 shares, or the average weekly trading volume of our common stock during the four calendar weeks preceding the filing of a notice on Form 144 with respect to the sale.
 
At July 31, 2007, subject to certain conditions, holders of an aggregate of approximately 13,511,174 shares of common stock have rights with respect to the registration of these shares of common stock with the SEC. We have agreed that following the Stock Purchase, Mr. Utterberg will have “piggyback” registration rights which means if we propose to register shares of our common stock, Mr. Utterberg will have the opportunity to include the shares he received in the Stock Purchase in the registration. In addition, we have agreed to register for resale the shares issued to Mr. Utterberg as consideration for the Stock Purchase in the event that, prior to the time this holding period under rule 144(k) lapses as to such shares, he ceases to be an affiliate of NxStage. If we register any of these shares of common stock, they can be sold in the public market without regard to the volume limitations of Rule 144.
 
As of July 31, 2007, 3,204,801 shares of common stock are authorized for issuance under our stock incentive plan, employee stock purchase plan and outstanding stock options. As of July 31, 2007, 3,155,323 shares were subject to outstanding options, of which 2,078,502 were exercisable and can be freely sold in the public market upon issuance, subject to the restrictions imposed on our affiliates under Rule 144.
 
Our costs have increased significantly as a result of operating as a public company, and our management is required to devote substantial time to comply with public company regulations.
 
As a public company, we incur significant legal, accounting and other expenses that we did not incur as a private company. In addition, the Sarbanes-Oxley Act of 2002, or the Sarbanes-Oxley Act, as well as new rules subsequently implemented by the SEC and the NASDAQ Global Market, have imposed various new requirements on public companies, including changes in corporate governance practices. Our management and other personnel now need to devote a substantial amount of time to these new requirements. Moreover, these rules and regulations increase our legal and financial compliance costs and make some activities more time-consuming and costly.
 
In addition, the Sarbanes-Oxley Act requires, among other things, that we maintain effective internal controls for financial reporting and disclosure controls and procedures. In particular, commencing in fiscal 2006, we must perform system and process evaluation and testing of our internal controls over financial reporting to allow management and our independent registered public accounting firm to report on the effectiveness of our internal controls over financial reporting, as required by Section 404 of the Sarbanes-Oxley Act. Our compliance with Section 404 will require that we incur substantial accounting expense and expend significant management efforts. If we are not able to comply with the requirements of Section 404 in a timely manner, or if we or our independent registered public accounting firm identify deficiencies in our internal controls over financial reporting that are deemed to be material weaknesses, the market price of our stock could decline and we could be subject to sanctions or investigations by the NASDAQ Global Market, SEC or other regulatory authorities.
 
We do not anticipate paying cash dividends, and accordingly stockholders must rely on stock appreciation for any return on their investment in us.
 
We anticipate that we will retain our earnings for future growth and therefore do not anticipate paying cash dividends in the future. As a result, only appreciation of the price of our common stock will provide a return to investors. Investors seeking cash dividends should not invest in our common stock.


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Our executive officers, directors and current and principal stockholders own a large percentage of our voting common stock and could limit new stockholders’ influence on corporate decisions or could delay or prevent a change in corporate control.
 
Our directors, executive officers and current holders of more than 5% of our outstanding common stock, together with their affiliates and related persons, beneficially own, in the aggregate, approximately 46% of our outstanding common stock. As a result, these stockholders, if acting together, will have the ability to determine the outcome of all matters submitted to our stockholders for approval, including the election and removal of directors and any merger, consolidation or sale of all or substantially all of our assets and other extraordinary transactions. The interests of this group of stockholders may not always coincide with our corporate interests or the interests of other stockholders, and they may act in a manner with which you may not agree or that may not be in the best interests of other stockholders. This concentration of ownership may have the effect of:
 
  •  delaying, deferring or preventing a change in control of our company;
 
  •  entrenching our management and/or Board;
 
  •  impeding a merger, consolidation, takeover or other business combination involving our company; or
 
  •  discouraging a potential acquirer from making a tender offer or otherwise attempting to obtain control of our company.
 Comment:  link1 "Risks Related to the Combined Businesses Following the Stock Purchase"
 
Risks Related to the Combined Businesses Following the Stock Purchase
 
In addition to the other information included in this proxy statement, you should carefully consider the following risks before deciding whether to vote for approval of the issuance of the shares of our common stock in the Stock Purchase or the increase in the number of shares issuable under our 2005 Plan. Risks related to NxStage’s business are described above under “Risks Related to NxStage.” In the event the Stock Purchase is completed, we will also face the following risks.
 
The combined businesses of NxStage and Medisystems will continue to rely upon the sale of a limited number of products.
 
The Medisystems’ business relies nearly exclusively upon the sale of a few key disposable products, including bloodlines and needles, and this is expected to continue for the foreseeable future. NxStage’s business relies nearly exclusively upon the sale of the System One, and this is expected to continue for the foreseeable future. Although the acquisition of Medisystems’ business will broaden NxStage’s product offerings, the combined business will continue to rely upon the sale of a limited number of key products primarily applicable to the dialysis business. To the extent that any of the combined businesses’ primary products are no longer successful or are withdrawn from the market for any reason, our combined businesses will suffer and we do not have other significant products in development that could replace these revenues.
 
The future growth of Medisystems’ business will depend on the successful launch and market acceptance of Medisystems’ StreamLine2 bloodline product.
 
The future growth of the Medisystems’ business depends upon the successful launch and market acceptance of Medisystems’ latest generation bloodline product, StreamLine2. StreamLine2 is designed to be a high-quality, high-performance bloodline that promises to yield valuable savings and improved patient outcomes for those clinics that adopt it for use. Market penetration of this product is quite limited to date, and it is not possible to predict whether and to what extent current and future customers will elect to use this product instead of more established Medisystems’ or competitive bloodlines. If we are unable to convert customers to the StreamLine2 product and receive more widespread commercial acceptance of this product, our ability to achieve our growth objectives for the Medisystems’ business could be impaired.


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The future profitability, growth and success of our combined businesses will also depend on our ability to achieve further product cost reductions by our combined operations.
 
The future profitability and growth of our combined businesses depends upon our ability to achieve further product cost reductions by our combined operations including improved manufacturing efficiencies at Medisystems’ manufacturing facilities and product design synergies. If product cost reductions are not achieved on a timely basis, the future profitability of our combined businesses will be delayed and may not be delivered.
 
The combined businesses will need to invest capital to expand Medisystems’ manufacturing facilities in Mexico and Italy to support anticipated increased product demand for System One cartridges and StreamLine2. We cannot guarantee that cash from operations will be sufficient to finance this expansion, or that we will complete this expansion on a timely and cost-effective basis.
 
To support the expected increased demand for the System One disposable cartridges and StreamLine2, we will need to increase the scale of Medisystems’ manufacturing and molding operations in Mexico and Italy. This will require the investment of capital over the next two years. It is possible that cash flow from our combined operations may not be sufficient to support our capital needs, and that we may require additional financing to fund the expansion. We cannot be certain that financing will be available in the amounts or on terms acceptable to us, or at all. If we are unable to obtain this additional financing when needed, we may be required to delay, reduce the scope of, or eliminate one or more aspects of our capacity expansion plans, which could harm the growth or profitability of our combined businesses.
 
The planned expansion of Medisystems’ manufacturing facilities will also require the purchase of specialized equipment and specialized construction. We cannot guarantee that we will be able to purchase all of the necessary equipment on satisfactory terms or timing, or that the necessary construction will be completed on a cost-effective or timely basis. Any delay in purchasing equipment or construction could harm the growth or profitability of our combined businesses.
 
Medisystems currently relies upon a third-party manufacturer to manufacture a significant percentage of its bloodline products using Medisystems’ supplied components. This manufacturer’s contractual obligation to manufacture such products for Medisystems expires in June 2008. In the event this agreement is not renewed or extended upon favorable terms, if at all, or in the event Medisystems is unable to sufficiently expand its manufacturing capabilities prior to June 2008 to support its requirements, the combined businesses’ growth and ability to meet customer demand would be impaired.
 
Historically, Medisystems has relied upon a third-party manufacturer, Kawasumi Laboratories, Inc. which we refer to as Kawasumi, to manufacture a significant percentage of its bloodline products using Medisystems’ supplied components. This third party has a strong history of manufacturing high-quality product for Medisystems. Kawasumi’s contractual obligation to manufacture bloodlines for Medisystems expires in June 2008. We cannot be certain this agreement will be renewed or extended on favorable terms, if at all, that we would be able to manufacture independently the volume of products currently manufactured by Kawasumi, or that we would be able to manufacture products at the same cost at which Medisystems could purchase products from Kawasumi under a new agreement, the failure of any of which could impair our combined businesses.
 
Medisystems also relies upon Kawasumi to supply all of its finished goods needles.
 
Medisystems depends solely on Kawasumi for all of its finished goods needles. Kawasumi’s obligation to supply needles to Medisystems expires in February 2011. In the event this agreement is not renewed or extended upon favorable terms, if at all, the revenues and profitability of the combined businesses will be impaired. It is not certain whether Medisystems would be able to obtain another source of quality needles if its agreement with Kawasumi is not renewed.


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Medisystems’ business relies heavily upon third-party distributors.
 
The majority of Medisystems’ revenues comes from three distributors, which collectively accounted for approximately 90% of Medisystems’ revenues in 2006, with its primary distributor, Schein, accounting for 65% of Medisystems’ revenues in 2006. Schein recently agreed to extend its distribution relationship with Medisystems through July 2009. Medisystems’ contracts with its other two distributors are scheduled to expire in October 2008 and July 2009. Medisystems’ relationship with Schein, in particular, is very significant for its business and any failure to continue this relationship would be harmful to the combined businesses, because Medisystems has no direct sales force and NxStage’s sales force has no experience selling bloodlines or needles.
 
The combined businesses will continue to rely heavily upon DaVita as a key customer. The partial or complete loss of DaVita as a customer could materially impair our combined financial results.
 
We expect that DaVita will continue to be a significant customer of the combined businesses. Sales through distributors to DaVita of Medisystems’ products accounted for approximately 38% of Medisystems’ revenues in 2006, and NxStage’s sales to DaVita accounted for approximately 19% of our revenues in 2006. Medisystems’ contract with DaVita includes certain minimum order requirements; however, these can be reduced significantly under certain circumstances. DaVita’s contractual commitments to purchase Medisystems’ needles expire in December 2007; and its commitments to purchase Medisystems’ bloodlines expire in September 2008. We cannot guarantee we will be able to negotiate an extension of Medisystems’ agreement with DaVita on favorable terms, if at all, or the extent to which DaVita will purchase Medisystems’ products following the completion of the Stock Purchase. NxStage’s agreement with DaVita does not impose minimum purchase requirements, and expires as early as 2010. The partial or complete loss of DaVita as a customer of our combined businesses would materially impair our combined financial results.
 
Medisystems, like NxStage, obtains some of its raw materials or components from a single source or a limited group of suppliers. It obtains sterilization services from a single supplier. The partial or complete loss of one of these suppliers could cause significant production delays, an inability to meet customer demand and a substantial loss in revenues.
 
Medisystems, like NxStage, depends on a number of single-source suppliers for some of the raw materials and components it uses in its products. It also obtains sterilization services from a single supplier. The dependence of the combined companies on single-source suppliers of raw materials, components and production services will continue to expose us to several risks, including disruptions in supply, price increases, late deliveries and an inability to meet customer demand. This could lead to customer dissatisfaction, damage to our reputation or customers switching to competitive products.
 
Finding alternative sources for these raw materials, components and production services would be difficult in several cases and may entail a significant amount of time and disruption. In other cases, it may not be possible to find an alternative source of supply.
 
Resin is a key input material to the manufacture of Medisystems products and our System One cartridge. Rising oil prices affect both the pricing and availability of this material. Continued escalation of oil prices could affect our ability to obtain sufficient supply of resin at the prices we need to manufacture our products at current rates of profitability.
 
Medisystems currently sources resin from a small number of suppliers. Rising oil prices over the last several years have resulted in significant price increases for this material. We cannot guarantee that prices will not continue to increase. NxStage’s and Medisystems’ contracts with customers restrict each of our ability to immediately pass on these price increases, and we cannot guarantee that future pricing to customers will be sufficient to accommodate increasing input costs.


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Medisystems has labor agreements with its production employees in Italy and in Mexico. We cannot guarantee that Medisystems will not in the future face strikes, work stoppages, work slowdowns, grievances, complaints, claims of unfair labor practices, other collective bargaining disputes or in Italy, anti-union behavior, that may cause production delays and negatively impact our ability to deliver our products on a timely basis.
 
MDS Italy has a national labor contract with Contratto collettivo nazionale di lavoro per gli addetti all’industria della gomma cavi elettrici ed affini e all’industria delle materie plastiche, and MDS Mexico has entered into a collective bargaining agreement with a Union named Mexico Moderno de Trabajadores de la Baja California C.R.O.C. Medisystems has not to date experienced strikes, work stoppages, work slowdowns, grievances, complaints, claims of unfair labor practices, other collective bargaining disputes, or in Italy, anti-union behavior, however we cannot guarantee that Medisystems will not be subject to such activity in the future. Any such activity would likely cause production delays, and negatively affect our ability to deliver our production commitments to customers, which could adversely affect our reputation and cause our combined businesses and operating results to suffer.
 
Medisystems and NxStage each have recently developed products and have limited manufacturing experience with these products.
 
Both Medisystems and NxStage continue to develop new products and make improvements to existing products. As such, both businesses have limited manufacturing experience with certain of their products, including Medisystems’ StreamLine2 product. The combined companies will continue to be exposed to risks relating to product quality, reliability and cost to produce until the manufacturing processes for these new products mature.
 
Medisystems does not have long-term supply contracts with many of its third-party suppliers.
 
Medisystems purchases raw materials and components from third-party suppliers, including some single source suppliers, through purchase orders and does not have long-term supply contracts with many of these third-party suppliers. Many of its third-party suppliers, therefore, are not obligated to perform services or supply products for any specific period, in any specific quantity or at any specific price, except as may be provided in a particular purchase order.
 
Medisystems does not maintain large volumes of inventory from most of its suppliers. If the combined businesses inaccurately forecast demand for finished goods, our ability to meet customer demand could be delayed and our competitive position and reputation could be harmed. In addition, if we fail to effectively manage our relationships with these suppliers, we may be required to change suppliers, which would be time consuming and disruptive and could lead to disruptions in product supply, which could permanently impair our customer base and reputation.
 
Medisystems’ historical bloodline business has been a commodities business subject to pricing pressure and the significant influences of consolidated buying power. Unless Medisystems can demonstrate sufficient product differentiation in its bloodline business through StreamLine2 or products that we introduce in the future, Medisystems will continue to be susceptible to further pressures to reduce product pricing and more vulnerable to the loss of its bloodline business to competitors in the dialysis industry.
 
Medisystems’ bloodline business has historically been a commodities business. Medisystems has competed favorably and gained share through the development of a high quality, low-cost, standardized blood tubing set, that could be used on several different dialysis machines. Medisystems continues to compete favorably in the dialysis bloodline business, but is increasingly subject to pricing pressures, especially given recent market consolidation in the dialysis services industry, with Fresenius and DaVita collectively controlling approximately 61% of U.S. dialysis services business. NxStage’s product, the System One, has been less subject to these pressures given its significant product differentiation from other competitive products, and its unique suitability to the home hemodialysis application. If the Stock Purchase is completed, the combined businesses will be subject to the pressures of a commodities business, unless we can successfully demonstrate to customers the differentiating features of the


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StreamLine2 product or products that we introduce in the future. If we are unsuccessful in establishing this differentiation, we may be susceptible to further pressures to reduce Medisystems product pricing and more vulnerable to the loss of Medisystems’ bloodline business to competitors in the dialysis industry.
 
The combined businesses will be subject to an increased risk of costly and damaging product liability claims and may not be able to maintain sufficient product liability insurance to cover claims against us.
 
With the expansion of our product offerings, the combined companies will be subject to an increased risk of product liability claims. If any of our products is found to have caused or contributed to injuries or deaths, we could be held liable for substantial damages. Claims of this nature may also adversely affect our reputation, which could damage our position in the market. Although NxStage has not been a party to any such claims, Medisystems has been, and it is reasonably likely that the combined businesses will be, party to future product liability claims. Although we maintain insurance, including product and excess liability insurance, we cannot provide assurance that any claim that may be brought against us will not result in court judgments or settlements in amounts that are in excess of the limits of our insurance coverage. Our insurance policies also have various exclusions, and we may be subject to a product liability claim for which we have no coverage. We will have to pay any amounts awarded by a court or negotiated in a settlement that exceed our coverage limitations or that are not covered by our insurance.
 
Any product liability claim brought against us, with or without merit, could result in the increase of our product liability insurance rates or the inability to secure additional insurance coverage in the future. A product liability claim, whether meritorious or not, could be time consuming, distracting and expensive to defend and could result in a diversion of management and financial resources away from our primary business, in which case our business may suffer.
 
We expect to increase the level of our insurance coverage following the completion of the proposed Stock Purchase, however, future claims could exceed our applicable insurance coverage.
 
The combined companies will continue to maintain insurance for property and general liability, directors’ and officers’ liability, products liability, workers compensation and other coverage in amounts and on terms deemed adequate by management based on our expectations for future claims. Although we may increase the level of our insurance coverage following the completion of the Stock Purchase, future claims could exceed our applicable insurance coverage, or in some instances our coverage may not cover the applicable claims.
 
The combined businesses will have increased reliance upon international manufacturing operations, and if we are unable to manage these risks effectively, our combined businesses could suffer.
 
In addition to NxStage’s operations in Germany and its new operations in Mexico, the combined businesses will have operations in Italy and additional operations in Mexico. The combined businesses will also have increased reliance upon foreign vendors for the purchase of finished goods and supplies. We will be subject to increased risks and challenges that specifically relate to these international operations, and we may not be successful if we are unable to meet and overcome these challenges. These risks include fluctuations in foreign currency exchange rates that may increase the U.S. dollar cost of foreign third-party supplies, increased costs associated with sourcing and shipping goods internationally, increased difficulty managing operations in multiple locations and local regulations that may restrict or impair our ability to conduct our operations.
 
The activities of the combined businesses will involve the import of finished goods into the United States from foreign countries, subject to customs inspections and duties, and the export of components and certain other products from other countries into Mexico and Thailand. If we misinterpret or violate these laws, or if laws governing our exemption from certain duties changes, we could be subject to significant fines, liabilities or other adverse consequences.
 
Medisystems imports into the United States disposable medical supplies from Thailand and Mexico. Medisystems also imports into the United States disposable medical components from Germany, Italy and


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Thailand and exports components and assemblies into Mexico and Italy. The import and export of these items are subject to extensive laws and regulations with which the combined businesses will need to comply. To the extent we fail to comply with these laws or regulations, or fail to interpret our obligations accurately, we may be subject to significant fines, liabilities and a disruption to our ability to deliver product, which could cause our combined businesses and operating results to suffer.
 
To the extent there are modifications to Generalised System of Preferences or cancellation of the Nairobi Protocol Classification such that our products would be subject to duties, our profitability would also be negatively impacted.
 
The activity of the combined businesses will involve the purchase of finished goods, components and assemblies from foreign countries, which involves exchange rate risk.
 
The combined businesses will be exposed to significant exchange rate risk in the Thai Baht, Euro and Peso. The U.S. dollar has weakened significantly against the Euro and Thai Baht over the last five years and may continue to do so. To the extent we fail to control our exchange rate risk, our profitability may suffer and our ability to maintain mutually beneficial and profitable relationships with key vendors could be impaired.
 
We may face challenges in integrating Medisystems’ business with NxStage’s and, as a result, may not realize the expected benefits of the proposed Stock Purchase.
 
Even though NxStage’s and Medisystems’ businesses are relatively distinct, integrating the operations and personnel of Medisystems and NxStage will require a significant investment of management’s time and effort as well as the investment of capital, particularly with respect to information systems. The successful integration of Medisystems and NxStage will require, among other things, coordination of certain manufacturing operations and sales and marketing operations and the integration of Medisystems’ operations into the NxStage organization. The diversion of the attention of NxStage’s and Medisystems’ senior management and any difficulties encountered in the process of combining the companies could cause the disruption of, or a loss of momentum in, the activities of the combined businesses.
 
The inability to successfully integrate the operations and personnel of Medisystems and NxStage, or any significant delay in achieving integration, could have a material adverse effect on the combined businesses after the completion of the acquisition, and, as a result, on the market price of NxStage’s common stock.
 
NxStage expects to incur significant costs associated with the proposed Stock Purchase.
 
NxStage estimates that it will incur direct transaction costs of approximately $3.5 million in connection with the proposed Stock Purchase. In addition, the combined businesses may incur charges to operations that they cannot currently reasonably estimate in the quarter in which the Stock Purchase is completed or the following quarters to reflect costs associated with integrating the two businesses. There can be no assurance that the combined businesses will not incur additional charges relating to the transaction in subsequent periods.
 
The success of the combined businesses will depend on the services of each of our senior executives as well as certain key engineering, scientific, manufacturing, clinical and marketing personnel, the loss of whom could negatively affect the combined businesses.
 
Our success has always depended upon the skills, experience and efforts of our senior executives and other key personnel, including our research and development and manufacturing executives and managers. Following the completion of the Stock Purchase, this will be even more important as we work to integrate our businesses. For both Medisystems and NxStage, much of our expertise is concentrated in relatively few employees, the loss of whom for any reason could negatively affect our business. Medisystems has experienced the loss of certain key employees recently, and the failure of further employees to remain with the combined businesses could be harmful to the success of the combined businesses. In March 2006, Medisystems’ Chief


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Financial Officer and Corporate Controller resigned. In October 2006, Medisystems’ Vice President of Regulatory and Quality Assurance resigned. In August 2007, NxStage’s Chief Operating Officer announced his intention to resign effective upon the completion of the Stock Purchase. Competition for our highly skilled employees is intense and we cannot prevent the future resignation of any employee. Most of the combined businesses’ employees have agreements which impose obligations that may prevent a former employee from working for a competitor for a period of time; however, these clauses may not be enforceable, or may be enforceable only in part.
 
The combined business, like NxStage, will continue to require significant capital to build the business, and financing may not be available to us on reasonable terms, if at all.
 
The combined business will continue to require significant working capital for the manufacture and rental of equipment by our customers as well as the expansion and integration of Medisystems’ operations. If our existing resources are insufficient to satisfy our liquidity requirements, we may need to sell additional equity or debt securities. Any sale of additional equity or debt securities may result in additional dilution to our stockholders, and we cannot be certain that we will be able to obtain additional public or private financing in amounts, or on terms, acceptable to us, or at all.
 
Our executive officers and directors, together with their affiliates and related persons, own a large percentage of our voting common stock and could limit new stockholders’ influence on corporate decisions or could delay or prevent a change in corporate control.
 
Our directors and executive officers, together with their affiliates and related persons, beneficially own, in the aggregate, approximately 47.6% of our outstanding common stock assuming the issuance of 6,500,000 shares of our common stock to Mr. Utterberg pursuant to the Stock Purchase. The interests of this group of stockholders may not always coincide with our corporate interests or the interests of other stockholders, and they may act in a manner with which you may not agree or that may not be in the best interests of other stockholders. This concentration of ownership may have the effect of:
 
  •  delaying, deferring or preventing, or alternatively, accelerating or causing, a change in control of our company;
 
  •  entrenching our management and/or board of directors;
 
  •  impeding a merger, consolidation, takeover or other business combination involving our company; or
 
  •  discouraging a potential acquirer from making a tender offer or otherwise attempting to obtain control of our company.


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Comment:  link1 "SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS"
 
SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS
 
This proxy statement contains forward-looking statements that involve substantial risks and uncertainties. All statements, other than statements of historical facts, included in this proxy statement regarding our strategy, future operations, future financial position, future revenues, projected costs, prospects and plans and objectives of management are forward-looking statements. The words “anticipates,” “believes,” “estimates,” “expects,” “intends,” “may,” “plans,” “projects,” “will,” “would” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. We have based these forward-looking statements on our current expectations and projections about future events. Although we believe that the expectations underlying any of our forward-looking statements are reasonable, these expectations may prove to be incorrect and all of these statements are subject to risks and uncertainties. Should one or more of these risks and uncertainties materialize, or should underlying assumptions, projections or expectations prove incorrect, actual results, performance or financial condition may vary materially and adversely from those anticipated, estimated or expected. We have identified below some important factors that could cause our forward-looking statements to differ materially from actual results, performance or financial conditions:
 
  •  failure of the home hemodialysis market to expand or expand at the rate we expect;
 
  •  our inability to grow our customer base and increase the adoption rate of home hemodialysis;
 
  •  our inability to grow and sustain our critical care business;
 
  •  our inability to adequately grow our operations and attain sufficient operating scale;
 
  •  our inability to obtain adequate profit margins;
 
  •  changes in Medicare dialysis reimbursement policies, the composite rate or the reimbursement policies or rates of other governmental or private payors;
 
  •  regulatory action by the FDA and changes in, or our failure to comply with, government regulations;
 
  •  our inability to achieve product development milestones or the introduction of technical innovations or new products by our competitors;
 
  •  our inability to effectively protect our intellectual property and not infringe on the intellectual property of others;
 
  •  our inability to raise sufficient capital when necessary;
 
  •  loss of any significant suppliers, especially sole-source suppliers;
 
  •  loss of key personnel;
 
  •  liability resulting from litigation;
 
  •  failure to complete the Stock Purchase or to realize the benefits of the proposed Stock Purchase;
 
  •  failure to successfully integrate NxStage and the MDS Entities; and
 
  •  other factors discussed elsewhere in this proxy statement.
 
We may not actually achieve the plans, intentions or expectations disclosed in our forward-looking statements and you should not place undue reliance on our forward-looking statements. We have included important factors in the cautionary statements included in this proxy statement, particularly in the section entitled “Risk Factors” that we believe could cause actual results or events to differ materially from the forward-looking statements that we make. Our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures or investments we may make. We do not assume any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.


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Comment:  link1 "THE SPECIAL MEETING OF NxSTAGE STOCKHOLDERS"
 
THE SPECIAL MEETING OF NxSTAGE STOCKHOLDERS
 
General
 
We are furnishing this proxy statement to our stockholders in connection with the solicitation of proxies by our board of directors for use at the special meeting of stockholders to be held on October 1, 2007 and at any adjournment, postponement or continuation thereof. This document is first being furnished to our stockholders on or about September 13, 2007.
Comment:  link1 "Date, Time and Place"
 
Date, Time and Place
 
The special meeting of our stockholders will be held at the offices of WilmerHale, 60 State Street, Boston, Massachusetts 02109, on October 1, 2007 at 10:00 a.m., local time.
Comment:  link1 "Purpose of the Special Meeting"
 
Purpose of the Special Meeting
 
At the special meeting, our stockholders will consider and act upon the following matters:
 
  •  Proposal One — approval of the issuance of the Stock Purchase Shares; and
 
  •  Proposal Two — approval of an amendment to our 2005 Plan to increase the number of shares of our common stock that may be issued under the 2005 Plan by an additional 3,800,000 shares, of which no more than 1,500,000 shares may be issued as restricted stock awards.
Comment:  link1 "Record Date, Shares of Common Stock Outstanding and Entitled to Vote"
 
Record Date, Shares of Common Stock Outstanding and Entitled to Vote
 
We have fixed the close of business on September 10, 2007 as the record date for determining the holders of our common stock entitled to notice of and to attend and to vote at the special meeting or at any adjournment thereof. As of the close of business on September 10, 2007, there were 30,041,633 shares of our common stock outstanding and entitled to vote. Each share of our common stock entitles its holder to one vote on each of the matters presented at the special meeting.
Comment:  link1 "Quorum and Vote of NxStage Stockholders Required"
 
Quorum and Vote of NxStage Stockholders Required
 
A quorum of stockholders is necessary to hold a valid meeting. A quorum will be present at the special meeting if shares of our common stock representing a majority of the votes entitled to be cast are represented in person or by proxy. If a quorum is not present at the special meeting, we expect that the meeting will be adjourned or postponed to solicit additional proxies. Abstentions, votes “FOR”, votes “AGAINST” and “broker non-votes” count as being present to establish a quorum. A “broker non-vote” occurs when a broker is not permitted to vote because the broker does not have instructions from the beneficial owner of the shares of common stock.
 
The proposals to be voted on at the special meeting will require the following approvals:
 
  •  Proposal One — the approval of the Stock Purchase Shares requires the affirmative vote of a majority of the votes cast at the special meeting at which a quorum is present.
 
  •  Proposal Two — the approval of the proposed amendment to our 2005 Plan requires the affirmative vote of a majority of the votes cast at the special meeting at which a quorum is present.
 
If you do not submit a proxy card or vote at the special meeting, your shares of common stock will not be counted as present for the purpose of determining a quorum and will have no effect on the outcome of the proposal to approve Proposal One or Proposal Two.


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 Comment:  link1 "Voting Instructions"
 
Voting Instructions
 
The following section summarizes important information on how to vote your shares of common stock.
 
Voting by Proxy
 
If you are a record holder, meaning your shares are registered in your name, you may vote over the Internet, by telephone, by mail or in person at the special meeting pursuant to the following instructions:
 
Over the Internet:  Go to the website of our tabulator, Computershare Investor Services, at www.investorvote.com. Use the vote control number printed on your enclosed proxy card to access your account and vote your shares. You must specify how you want your shares voted or your Internet vote cannot be completed and you will receive an error message. Your shares will be voted according to your instructions.
 
By Telephone:  Call 1-800-652-VOTE (8683) toll free from the United States, Canada and Puerto Rico, and follow the instructions on your enclosed proxy card. You must specify how you want your shares voted and confirm your vote at the end of the call or your telephone vote cannot be completed. Your shares will be voted according to your instructions.
 
By Mail:  Complete and sign your enclosed proxy card and mail it in the enclosed postage prepaid envelope to Computershare Investor Services. Your shares will be voted according to your instructions. If you do not specify how you want your shares voted, they will be voted as recommended by our board of directors.
 
In Person at the Special Meeting:  If you attend the special meeting, you may deliver your completed proxy card in person or you may vote by completing a ballot, which we will provide to you at the meeting.
 
Voting of Shares Held in Street Name
 
If your shares are held in “street name”, meaning they are held for your account by a broker or other nominee, you will receive instructions from your broker or other nominee regarding how to vote your shares over the Internet, by telephone or by mail. You should follow those instructions. If you wish to vote your shares in person at the special meeting, contact your broker or other nominee who holds your shares to obtain a brokers’ proxy card and bring it with you to the special meeting. You will not be able to vote in person at the special meeting unless you have a proxy from your broker issued in your name giving you the right to vote your shares.
 
Voting of Proxies at the Special Meeting
 
All properly executed proxies that we receive prior to the vote at the special meeting, and that are not revoked, will be voted in accordance with the instructions indicated on the proxies or, if no direction is indicated, to approve the issuance of the Stock Purchase Shares and the amendment to our 2005 Plan.
 
Properly executed proxies, other than proxies voting against the issuance of the Stock Purchase Shares and/or the amendment to our 2005 Plan, will also be voted for any adjournment or postponement of our special meeting of stockholders for the purpose of soliciting additional votes to approve Proposal One and Proposal Two, if necessary. Our board of directors does not currently intend to bring any other business before the special meeting and, so far as NxStage’s board of directors knows, no other matters are to be brought before the special meeting. If other business properly comes before the special meeting, the proxies will vote in accordance with their own judgment.
 
Copies of solicitation materials will be furnished to banks, brokerage houses, fiduciaries and custodians holding in their names shares of our common stock beneficially owned by others to forward to such beneficial owners. In addition to solicitation by use of the mails, proxies may be solicited by directors, officers, employees or agents of NxStage in person or by telephone, telegram or other means of communication. No


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additional compensation will be paid to directors, officers or other regular employees of NxStage for such services.
Comment:  link1 "Revocation of Proxies"
 
Revocation of Proxies
 
Stockholders may revoke their proxies at any time prior to use by delivering to our corporate secretary a signed notice of revocation or a later-dated signed proxy, or by attending the special meeting in person and revoking the proxy by signing a notice of revocation. If you vote your shares over the Internet or by telephone, only your latest Internet or telephone vote will be counted at the special meeting. Attendance at the special meeting does not in itself constitute the revocation of a proxy. Stockholders who have instructed their broker to vote their shares of common stock must follow their broker’s directions in order to change those instructions. You may also attend the special meeting in person instead of submitting a proxy; however, please see the instructions above under “Voting of Shares Held in Street-Name” if you wish to vote such shares in person at the special meeting.
Comment:  link1 "Solicitation of Proxies"
 
Solicitation of Proxies
 
We will pay for all costs incurred in connection with the solicitation of proxies from our stockholders on behalf of our board of directors, including assembly, printing and mailing of this document, its related attachments, and the proxy card. We have engaged Georgeson Shareholder Communications, Inc., a proxy solicitation firm, to solicit proxies from our stockholders. For these services, we expect to pay a fee of approximately $7,500 plus expenses. Our directors, officers and employees may solicit proxies by telephone, email, facsimile and in person, without additional compensation. Upon request, we will reimburse brokerage houses and other custodians, nominees and fiduciaries for their reasonable out-of-pocket expenses for distributing proxy materials.
Comment:  link1 "MATTERS BEING SUBMITTED TO A VOTE OF NxSTAGE STOCKHOLDERS"
 
MATTERS BEING SUBMITTED TO A VOTE OF NxSTAGE STOCKHOLDERS
Comment:  link1 "Proposal One — Approval of the Issuance of the Stock Purchase Shares"
 
Proposal One — Approval of the Issuance of the Stock Purchase Shares
 
At the special meeting and any adjournment or postponement thereof, our stockholders will be asked to consider and vote upon a proposal to approve the issuance of the Stock Purchase Shares.
 
Further information with respect to the issuance of the Stock Purchase Shares, the Stock Purchase, the MDS Entities and Mr. Utterberg is contained elsewhere in this proxy statement, including the sections “The Stock Purchase” beginning on page 55 and “The Stock Purchase Agreement” beginning on page 68.
 
OUR BOARD OF DIRECTORS RECOMMENDS A VOTE “FOR” THE ISSUANCE OF THE STOCK PURCHASE SHARES TO MR. UTTERBERG IN CONNECTION WITH THE STOCK PURCHASE
Comment:  link1 "Proposal Two — Approval of an Amendment to Our 2005 Plan"
 
Proposal Two — Approval of an Amendment to Our 2005 Plan
 
Overview
 
At the special meeting and any adjournment thereof, our stockholders will be asked to consider and vote upon a proposal to increase by 3,800,000 the number of shares of our common stock available for issuance under the 2005 Plan. Of the 3,800,000 additional shares, no more than 1,500,000 shares may be granted as restricted stock awards. Our board of directors believes that our continued growth and profitability depends, in large part, on our ability to maintain a competitive position in attracting, retaining and motivating key employees with experience and ability. We believe the 2005 Plan furthers these objectives. As of the date of this proxy statement, the maximum number of shares we are currently authorized to issue, subject to adjustment in the event of stock splits and other similar events, pursuant to awards granted under the 2005 Plan, is 3,601,459. At July 31, 2007, options for the purchase of 465,256 shares of our common stock remained available for grant under the plan.


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If the Stock Purchase is completed, our employee population will grow from approximately 300 to 1,000. In order for us to be able to grant equity incentives to these new employees and to support our continued growth and compensation needs, our board of directors has amended the 2005 Plan, subject to stockholder approval, to increase the total number of shares that may be issued under the plan by 3,800,000 shares, of which no more than 1,500,000 may be granted as restricted stock awards, restricted stock units, and other stock-based awards.
 
Our board of directors approved several additional amendments to the 2005 Plan which did not require the approval of our stockholders. The 2005 Plan was amended: (1) to remove the “evergreen” provision, which provided for an annual automatic increase of the number of shares available under the plan, (2) to eliminate the return of shares received by us in connection with the net exercise of options to the available pool under the plan, (3) to provide that all options and stock appreciation rights granted under the 2005 Plan must be granted at fair market value on the date of grant and have a term no more than 10 years, and (4) to provide that stock options issued under the plan may not be (a) repriced by (x) lowering the option exercise price of an option or (y) canceling an outstanding stock option and replacing it with a stock option with a lower exercise price, or (b) cashed out by us, unless such action has been approved by our stockholders.
 
Outstanding Stock Option and Restricted Stock Data
 
As of June 30, 2007, stock options to purchase 3,153,724 shares of our common stock were outstanding, the weighted average option grant price for these options was $7.37 and the weighted average contractual life of which was 5.8. In addition, we had 15,839 shares of restricted stock outstanding.
 
The weighted-average fair value of stock options granted during the six months ended June 30, 2007 was $11.92. The fair value of stock options at date of grant was estimated using the Black-Scholes option-pricing model with the following assumptions:
 
     
    Six Months Ended
    June 30, 2007
 
Expected life
  4.75 years(1)
Risk-free interest rate
  4.69%(2)
Expected stock price volatility
  75%(3)
Expected dividend yield
 
 
 
(1) The expected term was determined using the simplified method for estimating expected life of “plain-vanilla” options.
 
 
(2) The risk-free interest rate for each grant is equal to the U.S. Treasury rate in effect at the time of grant for instruments with an expected life similar to the expected option term.
 
 
(3) Because we have no options that are traded publicly and because of its limited trading history as a public company, the stock volatility assumption is based on an analysis of the volatility of the common stock of comparable companies in the medical device and technology industries.
 
 
We have estimated expected forfeitures of stock options with the adoption of SFAS 123R and record stock-based compensation net of estimated forfeitures. In developing a forfeiture rate estimate, we considered our historical experience, our growing employee base and the limited trading history of our common stock.
 
Summary of the 2005 Plan
 
The following is a brief summary of the material terms of our 2005 Plan.


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Types of Awards
 
The 2005 Plan provides for the grant of incentive stock options intended to qualify under Section 422 of the Internal Revenue Code of 1986, as amended, or the Code, non-statutory stock options, stock appreciation rights, restricted stock, restricted stock units and other stock-based awards as described below, collectively referred to as Awards.
 
Incentive Stock Options and Nonstatutory Stock Options.  Optionees receive the right to purchase a specified number of shares of common stock at a specified option price and subject to such other terms and conditions as are specified in connection with the option grant. Options may be granted at an exercise price equal to or greater than the fair market value of the common stock on the date of grant. Under present law, incentive stock options and options intended to qualify as performance-based compensation under Section 162(m) of the Code may not be granted at an exercise price less than 100% of the fair market value of our common stock on the date of grant (or less than 110% of the fair market value in the case of incentive stock options granted to optionees holding more than 10% of the voting power of NxStage). Options may not be granted for a term in excess of ten years. The 2005 Plan permits the following forms of payment of the exercise price of options: (i) payment by cash, check or through a broker providing for such method of payment, (ii) subject to certain conditions, surrender to us of shares of our common stock, (iii) delivery to us of a promissory note on terms determined by our board of directors, (iv) any other lawful means, or (v) any combination of these forms of payment.
 
Stock Appreciation Rights.  A stock appreciation right, or SAR, is an award entitling the holder, upon exercise, to receive an amount in our common stock determined by reference to appreciation, from and after the date of grant, in the fair market value of a share of common stock. SARs may not be granted at an exercise price less than 100% of the fair market value of our common stock on the date of grant and may be granted independently or in tandem with an option.
 
Restricted Stock Awards; Restricted Stock Units.  Restricted stock awards entitle recipients to acquire shares of our common stock, subject to our right to repurchase all or part of such shares from the recipient in the event that the conditions specified in the applicable Award are not satisfied prior to the end of the applicable restriction period established for such Award. Restricted stock units entitle recipients to receive shares of common stock to be delivered at the time such shares of common stock vest.
 
Other Stock-Based Awards.  Under the 2005 Plan, our board of directors has the right to grant other Awards based upon our common stock having such terms and conditions as the board may determine, including the grant of shares based upon certain conditions, the grant of Awards that are valued in whole or in part by reference to, or otherwise based on, shares of common stock, and the grant of Awards entitling recipients to receive shares of common stock to be delivered in the future.
 
Transferability of Awards
 
Except as our board of directors may otherwise determine or provide in an Award, Awards may not be sold, assigned, transferred, pledged or otherwise encumbered by the person to whom they are granted, either voluntarily or by operation of law, except by will or the laws of descent and distribution or, other than in the case of an incentive stock option, pursuant to a qualified domestic relations order. During the life of the participant, Awards are exercisable only by the participant.
 
Eligibility to Receive Awards
 
Our employees, officers, directors, consultants and advisors are eligible to be granted Awards under the 2005 Plan. Under present law, however, incentive stock options may only be granted to our employees. The maximum number of shares with respect to which Awards may be granted to any participant under the 2005 Plan may not exceed 1,000,000 shares per calendar year.
 
Plan Benefits
 
As of July 31, 2007, approximately 266 persons were eligible to receive Awards under the 2005 Plan, including our 5 named executive officers and 6 non-employee directors.


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The following table sets forth, as of July 31, 2007, the stock option and restricted stock grants made under the 2005 Plan since its adoption.
 
         
    No. of Options/
 
    Shares Granted  
 
Executive Officers:
       
     
Robert S. Brown
    200,000  
Philip R. Licari
    221,989  
Winifred L. Swan
    10,000  
Joseph E. Turk, Jr.
     
All Executive Officers as a Group
    431,989  
All Directors who are not Executive Officers as a Group
    309,499  
Each Associate of any of such Directors or Executive Officers
     
Each Other Person who Received or is to Receive 5% of Awards under the 2005 Plan
     
All Employees, who are not Executive Officers, as a Group(1):
    3,129,604  
 
 
(1) This number excludes stock options that expired prior to being exercised.
 
Administration
 
The 2005 Plan is administered by our board of directors. The board has the authority to adopt, amend and repeal the administrative rules, guidelines and practices relating to the 2005 Plan and to interpret the provisions of the 2005 Plan. Pursuant to the terms of the 2005 Plan, the board may delegate authority under the 2005 Plan to one or more committees or subcommittees of the board.
 
Subject to any applicable limitations contained in the 2005 Plan, the board of directors, the compensation committee, or any other committee to whom the board of directors delegates authority, as the case may be, selects the recipients of Awards and determines (1) the number of shares of common stock covered by options and the dates upon which such options become exercisable, (2) the exercise price of options, (3) the duration of options (which may not exceed 10 years), and (4) the number of shares of common stock subject to any SAR, restricted stock award, restricted stock unit award or other stock-based Awards and the terms and conditions of such Awards, including conditions for repurchase, issue price and repurchase price.
 
We will be required to make appropriate adjustments in connection with the 2005 Plan and any outstanding Awards to reflect stock splits, stock dividends, recapitalizations, spin-offs and other similar changes in capitalization.
 
The 2005 Plan also contains provisions addressing the consequences of any “Reorganization Event”, which is defined as (a) any merger or consolidation of NxStage with or into another entity as a result of which all of our common stock converted into or exchanged for the right to receive cash, securities or other property, or is cancelled or (b) any exchange of all of our common stock for cash, securities or other property pursuant to a share exchange transaction or (c) any liquidation or dissolution of NxStage. Upon the occurrence of a reorganization event, all outstanding options will be assumed or equivalent options substituted by the successor corporation. If the reorganization event also constitutes a change in control event (as defined in the 2005 Plan), 50% of the shares that underlie each option outstanding under the 2005 Plan and that are unvested as of the date of the reorganization event will become immediately exercisable. If a change of control event occurs and within one year of the change in control event an option holder’s employment with us or our succeeding corporation is terminated by such holder for good reason (as defined in the 2005 Plan) or is terminated by us or the succeeding corporation without cause (as defined in the 2005 Plan), each option held by the holder will become immediately exercisable for the remaining 50% of the shares that had been unvested as of the date of the change of control event. Notwithstanding the foregoing, if the acquiring or succeeding corporation in a reorganization event does not agree to assume or substitute for outstanding options, our board of directors will provide that all unexercised options will become exercisable in full prior to the reorganization event and the options, if unexercised, will terminate on the date the reorganization event takes place. If under the terms of


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the reorganization event holders of our common stock receive cash for their shares, our board may instead provide for a cash-out of the value of any outstanding options less the applicable exercise price.
 
Upon the occurrence of a reorganization event, or the signing of an agreement with respect to a reorganization event, our repurchase and other rights with respect to shares of restricted stock will inure to the benefit of our successor and will apply equally to the cash, securities or other property into which our common stock is then converted.
 
Upon the occurrence of a change in control event (as defined in the 2005 Plan) that does not also constitute a reorganization event, 50% of the shares that underlie each option outstanding under the 2005 Plan and that are unvested as of the date of the change of control event will become immediately exercisable. If a change of control event occurs and within one year of the change in control event an option holder’s employment with us or our succeeding corporation is terminated by such holder for good reason (as defined in the 2005 Plan) or is terminated by us or the succeeding corporation without cause (as defined in the 2005 Plan), each option held by the holder will become immediately exercisable for the remaining 50% of the shares that had been unvested as of the date of the change of control event.
 
Upon the occurrence of a change in control event that does not also constitute a reorganization event, 50% of the shares of restricted stock outstanding under any award will become immediately free of all restrictions and conditions. If within one year of a change in control event a restricted stock holder’s employment with us or our succeeding corporation is terminated by such holder for good reason or is terminated by us or the succeeding corporation without cause, the remaining 50% of such holder’s restricted stock that had been unvested as of the date of the change of control event will become immediately free of all restrictions and conditions.
 
Our board of directors or the compensation committee may at any time provide that any Award will become immediately exercisable in full or in part, free of some or all restrictions or conditions, or otherwise realizable in full or in part, as the case may be.
 
If any Award expires or is terminated, surrendered, canceled without having been fully exercised, or forfeited in whole or in part, the unused shares of our common stock covered by such Award will again be available for grant under the 2005 Plan, subject, however, in the case of incentive stock options, to any limitations under the Code.
 
Substitute Options
 
In connection with a merger or consolidation of an entity with NxStage or the acquisition by us of property or stock of an entity, our board of directors may grant options in substitution for any options or other stock or stock-based awards granted by such entity or an affiliate thereof. Substitute options may be granted on such terms, as the board deems appropriate in the circumstances, notwithstanding any limitations on options contained in the 2005 Plan.
 
Amendment or Termination
 
No Award may be made under the 2005 Plan after September 7, 2015 but Awards previously granted may extend beyond that date. The board of directors may at any time amend, suspend or terminate the 2005 Plan; provided that, no amendment requiring stockholder approval under any applicable legal, regulatory or listing requirement will become effective until such stockholder approval is obtained.
 
Federal Income Tax Consequences of the 2005 Plan
 
The following generally summarizes the U.S. federal income tax consequences that generally will arise with respect to awards granted under the 2005 Plan. This summary is based on the federal tax laws in effect as of the date of this proxy statement. This summary assumes that all awards are exempt from, or comply with, the rules under Section 409A of the Internal Revenue Code, as amended, or the Code, relating to nonqualified deferred compensation. Changes to these laws could alter the tax consequences described below.


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Incentive Stock Options.  A participant will not have income upon the grant of an incentive stock option. Also, except as described below, a participant will not have income upon exercise of an incentive stock option if the participant has been employed by us or a 50% or more owned corporate subsidiary at all times beginning with the option grant date and ending three months before the date the participant exercises the option. If the participant has not been so employed during that time, then the participant will be taxed as described below under “Nonstatutory Stock Options.” The exercise of an incentive stock option may subject the participant to the alternative minimum tax.
 
A participant will have income upon the sale of the stock acquired under an incentive stock option at a profit (if sales proceeds exceed the exercise price). The type of income will depend on when the participant sells the stock. If a participant sells the stock more than two years after the option was granted and more than one year after the option was exercised, then all of the profit will be long-term capital gain. If a participant sells the stock prior to satisfying these waiting periods, then the participant will have engaged in a disqualifying disposition and a portion of the profit will be ordinary income and a portion may be capital gain. This capital gain will be long-term if the participant has held the stock for more than one year and otherwise will be short-term. If a participant sells the stock at a loss, meaning sales proceeds are less than the exercise price, then the loss will be a capital loss. This capital loss will be long-term if the participant held the stock for more than one year and otherwise will be short-term.
 
Nonstatutory Stock Options.  A participant will not have income upon the grant of a nonstatutory stock option. A participant will have compensation income upon the exercise of a nonstatutory stock option equal to the value of the stock on the day the participant exercised the option less the exercise price. Upon sale of the stock, the participant will have capital gain or loss equal to the difference between the sales proceeds and the value of the stock on the day the option was exercised. This capital gain or loss will be long-term if the participant has held the stock for more than one year and otherwise will be short-term.
 
Restricted Stock.  A participant will not have income upon the grant of restricted stock unless an election under Section 83(b) of the Code is made within 30 days of the date of grant. If a timely 83(b) election is made, then a participant will have compensation income equal to the value of the stock less the purchase price. When the stock is sold, the participant will have capital gain or loss equal to the difference between the sales proceeds and the value of the stock on the date of grant. If the participant does not make an 83(b) election, then when the stock vests the participant will have compensation income equal to the value of the stock on the vesting date less the purchase price. When the stock is sold, the participant will have capital gain or loss equal to the sales proceeds less the value of the stock on the vesting date. Any capital gain or loss will be long-term if the participant held the stock for more than one year and otherwise will be short-term.
 
Other Stock-Based Awards.  The tax consequences associated with any other stock-based award granted under the 2005 plan will vary depending on the specific terms of such award. Among the relevant factors are whether or not the award has a readily ascertainable fair market value, whether or not the award is subject to forfeiture provisions or restrictions on transfer, the nature of the property to be received by the participant under the award and the participant’s holding period and tax basis for the award or underlying common stock.
 
Tax Consequences to NxStage.  There will be no tax consequences to us except that we will be entitled to a deduction when a participant has compensation income. Any such deduction will be subject to the limitations of Section 162(m) of the Code.
 
OUR BOARD OF DIRECTORS RECOMMENDS A VOTE “FOR” THE AMENDMENT TO THE 2005 PLAN


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Comment:  link1 "THE STOCK PURCHASE"
 
THE STOCK PURCHASE
 
The following is a description of the material aspects of the Stock Purchase, including the stock purchase agreement. While we believe that the following description covers the material terms of the Stock Purchase, the description may not contain all of the information that is important to you. We encourage you to read carefully this entire proxy statement, including the stock purchase agreement attached to this proxy statement as Annex A, for a more complete understanding of the Stock Purchase.
Comment:  link1 "Background of the Stock Purchase"
 
Background of the Stock Purchase
 
Medisystems has been a significant supplier to NxStage since our inception. Prior to 2005, Medisystems was the primary supplier of components for our System One disposable cartridges. Since 2006, Medisystems has supplied the completed disposable cartridge for our System One. Medisystems is wholly-owned by Mr. Utterberg, a significant stockholder and director of NxStage since 1999. Historically, our supply arrangement with Medisystems was conducted on a purchase order basis. During 2006, we began negotiating a long-term supply agreement with Medisystems for our disposable cartridges. We and Medisystems entered into this long-term supply agreement on January 4, 2007.
 
In the course of negotiating the supply agreement, in late December 2006, Mr. Utterberg approached our chief executive officer, Jeff Burbank, about our possible acquisition of Medisystems. On January 3, 2007, our board of directors authorized Mr. Burbank to pursue preliminary discussions pertaining to the possible acquisition of Medisystems.
 
Between January 5 and January 8, 2007, Mr. Burbank and Mr. Licari, our chief operating officer, accompanied Mr. Utterberg and Mr. Azel, the Medisystems vice president of operations, on a facility tour of Medisystems’ manufacturing facilities in Mexico and Italy.
 
In addition to the trips to Mexico and Italy, we conducted preliminary financial and contractual due diligence using materials supplied by Medisystems between January 6 and January 22, 2007.
 
On January 23, 2007, at a meeting of the board of directors, our management and the board of directors, excluding Mr. Utterberg, discussed our possible acquisition of Medisystems and reviewed the due diligence completed by our management to date. Based on the information provided, our board of directors discussed potential risks and benefits of the proposed transaction, possible deal structures and next steps, including engaging appropriate experts to assist in diligence efforts, valuation estimates and deal structuring. It was agreed that the board of directors should continue to have outside counsel present for all discussions regarding a potential transaction with Medisystems.
 
On January 30, 2007 at a meeting of the board of directors, management reviewed with the board of directors, excluding Mr. Utterberg, financial information received to date from Medisystems and discussed Medisystems’ corporate structure, business and financial position, as well as some of the risks and benefits of a potential Medisystems acquisition. The board of directors asked management to proceed with its evaluation of Medisystems as a possible acquisition target and report to the board of directors on its findings.
 
On February 5 and 6, 2007, Mr. Brown, our chief financial officer of NxStage, went to Seattle to review the Medisystems financial information and talk to members of the Medisystems management team.
 
On February 7, 2007, Mr. Burbank and Mr. Brown met with representatives of Merrill Lynch to discuss Medisystems and Merrill Lynch’s role as financial advisor to NxStage.
 
Between February 12, 2007 and February 23, 2007, representatives of NxStage and Merrill Lynch engaged in a review of financial information and development of financial projections for a potential acquisition of Medisystems.
 
On February 26, 2007, at a special meeting of our board of directors, excluding Mr. Utterberg, management and representatives of Merrill Lynch continued discussions regarding NxStage’s evaluation of a potential acquisition of Medisystems. Representatives of Merrill Lynch reviewed their analysis to date of a potential acquisition of Medisystems, and they summarized business information learned to date about


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Medisystems, including historical sales performance and future growth opportunities as well as certain business rationales for acquiring Medisystems, including a broader product line, control of System One cartridge manufacturing and possible acceleration of profitability. Representatives of Merrill Lynch reviewed their preliminary valuation analysis of a Medisystems acquisition, including potential transaction structures. The directors and management then discussed next steps and proposed a future negotiation process with Merrill Lynch and management. Management agreed to proceed according to the process discussed and to report back to the board of directors.
 
On March 1, 2007, Mr. Burbank and James Boylan of Merrill Lynch met with Mr. Utterberg in Seattle to deliver a term sheet outlining our proposed terms for the transaction, including the structure of the proposed transaction, the consideration to be paid in the transaction and other terms and conditions.
 
On March 7, 2007, Mr. Burbank and Mr. Boylan met with Mr. Utterberg in Lawrence, Massachusetts to continue discussions regarding the terms and conditions and possible structure of a Medisystems acquisition, including the structure of the proposed transaction, the type, amount, and timing, of consideration to be paid in the transaction and the assets to be acquired.
 
Between March 7 and March 16, 2007, our management and Mr. Utterberg continued to negotiate terms and conditions of a possible acquisition of Medisystems.
 
On March 26, 2007, Mr. Burbank, Mr. Brown and Mr. Boylan met with Mr. Utterberg and Ann Kelly, financial advisor to Mr. Utterberg, in Chicago to discuss valuation of the Medisystems acquisition.
 
Between March 26 and April 13, 2007, the Company and Mr. Utterberg continued to negotiate terms and conditions of a possible acquisition of Medisystems, including the structure of the proposed transaction, the type, amount, and timing of consideration to be paid in the transaction and the assets to be acquired and the terms of the consulting agreement with Mr. Utterberg.
 
On April 13, 2007 at a special meeting of our board of directors, excluding Mr. Utterberg, management and the board discussed the summary of key business terms and strategic rationale for a Medisystems acquisition. Management and the board of directors reviewed certain preliminary financial analyses of the proposed transaction and discussed different structuring alternatives for the transaction. Management and the board of directors then discussed the process for approving the proposed acquisition, given its status as a related party transaction. Pursuant to the requirements of the Audit Committee Charter, the Audit Committee would be required to vote on all related party transactions, and it was agreed that the Audit Committee would follow a process substantially similar to the process used in approving our supply agreement with Medisystems. Following the conclusion of these discussions, management reviewed the ongoing diligence efforts relating to the proposed acquisition. At the conclusion of these discussions, members agreed that management should continue to negotiate the proposed acquisition of Medisystems according to the general terms reviewed with the board of directors.
 
Between April 17 and April 20, 2007, Mr. Burbank and Mr. Brown were in Seattle to meet with Mr. Utterberg and Ms. Kelly to negotiate terms and conditions of the acquisition and review financial information related to the acquisition. Negotiations at this meeting focused primarily on the timing of the consideration to be paid in the transaction, the assets to be acquired in the transaction, the terms of an on-going consulting agreement between the parties and what restriction, if any, would be placed on any shares issued to Mr. Utterberg as deal consideration.
 
On April 19, 2007 at a meeting of our board of directors, excluding Mr. Utterberg, management and the board of directors discussed proposed key business terms for the acquisition and discussed how certain terms had changed from those previously presented to the board of directors. Members discussed the proposed deal structure at length, as well as other key business terms. At the conclusion of these discussions, members agreed that Mr. Burbank should continue to negotiate the proposed acquisition of Medisystems according to the general terms reviewed with the board of directors.
 
On April 25, 2007, our Audit Committee met to discuss, among other things, the status of ongoing diligence and negotiations with Medisystems. On April 26, 2007, the same information was shared with our


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full board or directors, excluding Mr. Utterberg. Merrill Lynch also presented information at this meeting regarding its ongoing valuation analysis of Medisystems and its perceptions regarding other deal terms, including the timing of deal consideration and the assets being transferred.
 
Between April 26, 2007 and May 30, 2007, several meetings of the Audit Committee were held to review the status of due diligence efforts and ongoing negotiations as well as any changes to key business terms arising in the course of ongoing negotiations.
 
An initial draft of the stock purchase agreement was delivered by our counsel, WilmerHale, to Medisystems and its counsel, Arnold & Porter, on April 27, 2007. We received Medisystems’ and its counsel’s preliminary comments to the stock purchase agreement on May 1 and 2, 2007, and we received a revised draft of the stock purchase agreement on May 3, 2007. WilmerHale distributed a revised draft of the stock purchase agreement to Medisystems and its counsel on May 4th. Arnold & Porter delivered an issues list in response to the revised draft on May 5, 2007, and the parties participated in a conference call, with their respective counsel, on May 6th to discuss the issues list. Arnold & Porter distributed a revised draft of the stock purchase agreement responsive to many of the matters discussed in that conference call on May 7, 2007.
 
The parties, with their counsel, met in Boston, Massachusetts to negotiate the stock purchase agreement on May 8th and 9th. WilmerHale distributed a revised draft of the stock purchase agreement reflective of what the parties had agreed to during these meetings on May 15, 2007. Arnold & Porter delivered a draft response to the stock purchase agreement on May 23, 2007. Mr. Burbank, our Chief Executive Officer, delivered a revised draft of the stock purchase agreement to Mr. Utterberg on May 25, 2007, and Mr. Utterberg delivered a revised draft in response to Mr. Burbank on May 27, 2007. Mr. Burbank delivered further revised drafts of the stock purchase agreement to Mr. Utterberg on May 29, 30 and 31, 2007. Mr. Utterberg and Mr. Burbank exchanged revised drafts of the stock purchase agreement to each other on May 31st. On June 1, 2007, WilmerHale sent revisions to the stock purchase agreement to Arnold & Porter, and Arnold & Porter distributed a revised draft of the stock purchase agreement to WilmerHale on the same day. Arnold & Porter distributed additional changes to the stock purchase agreement on June 2, 2007, and final changes to the stock purchase agreement on June 4, 2007, the date on which the stock purchase agreement was definitively approved by our board of directors and signed by both parties.
 
During April and May 2007, representatives of NxStage and Medisystems engaged in substantial due diligence in connection with the proposed business combination, including financial, intellectual property, regulatory and legal due diligence. Outside experts were engaged to assist in these efforts. Diligence reports from all outside experts were obtained and shared with our Audit Committee and our full board of directors, other than Mr. Utterberg.
 
On June 3 and 4, 2007, meetings of our Audit Committee and our full board of directors, excluding Mr. Utterberg, were held to review the final documents in detail as well as management’s recommendations with respect to the transaction. Representatives of Merrill Lynch and WilmerHale were present at these meetings. Merrill Lynch reviewed its final analysis of the transaction and deal structure and delivered its oral fairness opinion. Merrill Lynch also delivered its written fairness opinion on June 4, 2007.
 
On June 4, 2007, our Audit Committee and our full board of directors, excluding Mr. Utterberg, approved the Stock Purchase and later that day, we executed the stock purchase agreement and issued a press release announcing the Stock Purchase.
Comment:  link1 "Our Reasons for the Stock Purchase"
 
Our Reasons for the Stock Purchase
 
Our board of directors has determined that the terms of the Stock Purchase and the stock purchase agreement are fair to, and in the best interests of, NxStage and our stockholders. Our board of directors consulted with senior management, as well as legal counsel, and financial advisors in reaching its decision to approve the Stock Purchase. Our board of directors considered a number of factors in its deliberations, including the following:
 
  •  historical information concerning NxStage’s and Medisystems’ respective businesses, prospects, financial performance and condition, operations, technology, management and competitive position,


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including, without limitation, reports concerning results of operations during the most recent fiscal year and fiscal quarter for each corporation;
 
  •  our management’s view of the financial condition, results of operations and businesses of NxStage and Medisystems before and after giving effect to the Stock Purchase;
 
  •  current financial market conditions and historical market prices, volatility and trading information with respect to our common stock;
 
  •  the relationship between the market value of our common stock and the consideration to be paid by us in the Stock Purchase and a comparison of comparable transactions;
 
  •  the terms of the stock purchase agreement, including the parties’ representations, warranties and covenants, and the conditions to their respective obligations;
 
  •  detailed financial analysis and pro forma and other information with respect to the companies presented by Merrill Lynch in presentations to the board of directors, including Merrill Lynch’s opinion that the consideration to be paid under the stock purchase agreement is fair from a financial point of view to our stockholders;
 
  •  reports from management, financial and tax advisors, independent auditors, outside legal experts and others as to the results of the due diligence investigation of Medisystems;
 
  •  the prices paid in comparable transactions involving other medical device companies, as well as the trading performance for comparable companies in the industry;
 
  •  beliefs shared by our senior management that the prospects of the combined entity were more favorable than our prospects as a separate entity, due to:
 
  −  the benefits associated with gaining manufacturing scale and controlling the manufacture of our key disposable product;
 
  −  the benefits associated with an expanded product line;
 
  −  the belief that the transaction may accelerate our timeline to profitability; and
 
  −  the belief that the transaction may enable us to accelerate the development of additional products in the dialysis market.
 
  •  the cost of acquiring Medisystems’ disposable manufacturing operations and leadership team compared to the time to internally develop the same capabilities; and
 
  •  the interests of our officers and directors in the Stock Purchase, including the matters described under “The Stock Purchase — Interests of Mr. Utterberg in the Stock Purchase” on page 65 and the impact of the Stock Purchase on our stockholders and employees, including the fact that Mr. Utterberg is a member of our board of directors.
 
Our board of directors also considered potential negative factors relating to the Stock Purchase, including:
 
  •  the potential negative effect on our common stock price if product development expectations for Medisystems are not met;
 
  •  the risk that the Medisystems business will not perform as expected;
 
  •  the risk that the transaction will not accelerate our timeline to profitability;
 
  •  the risk that the Medisystems StreamLine2 product will not achieve commercial acceptance;
 
  •  the risk that the transaction will not result in the anticipated cost savings;
 
  •  the risk that the Stock Purchase may not be completed in a timely manner, if at all;
 
  •  the risk that we will be unable to retain and recruit employees critical to the ongoing success of the combined company’s operations;


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  •  the risk of adverse reactions of Medisystems’ customers and vendors to the acquisition;
 
  •  the risk that the integration of the Medisystems business could be more costly and time consuming than anticipated, which could adversely affect the combined company’s operating results and preclude the achievement of benefits anticipated from the Stock Purchase;
 
  •  the risk of Medisystems being acquired by another entity;
 
  •  the risk that our management’s attention will be diverted from other strategic and operational priorities to implement the merger; and
 
  •  the other risks and uncertainties discussed above under “Risk Factors” beginning on page 18
 
The foregoing discussion of the items that our board of directors considered is not intended to be exhaustive, but includes all material items. In view of the complexity and wide variety of factors, both positive and negative, that our board of directors considered, our board of directors did not find it practical to quantify, rank or otherwise weight the factors considered. In considering the various factors, individual members of our board of directors considered all of these factors as a whole and concluded that, on balance, the benefits of the Stock Purchase to NxStage and our stockholders outweighed the risks.
Comment:  link1 "Recommendation of Our Board of Directors"
 
Recommendation of Our Board of Directors
 
After careful consideration, our board of directors, without Mr. Utterberg, determined that the proposed Stock Purchase is fair to, and in the best interests of, our company and stockholders. Our board of directors recommends that our stockholders vote “FOR” the issuance of our common stock in the Stock Purchase.
 
In considering the recommendation of our board of directors with respect to the Stock Purchase, our stockholders should be aware that Mr. Utterberg has interests in the Stock Purchase and the related transactions that are different from the interests of our stockholders generally. See “— Interests of Mr. Utterberg in the Stock Purchase” beginning on page 65.
Comment:  link1 "Opinion of NxStage’s Financial Advisor"
 
Opinion of NxStage’s Financial Advisor
 
Our board of directors retained Merrill Lynch to act as its financial advisor in connection with the proposed Stock Purchase. Merrill Lynch delivered its oral opinion to our board of directors, which was subsequently confirmed in writing, that, as of June 4, 2007, and based upon and subject to the assumptions, qualifications and limitations set forth in its written opinion (which are described below), the consideration to be paid by us in connection with the Stock Purchase was fair, from a financial point of view, to NxStage.
 
The full text of the written opinion of Merrill Lynch, dated June 4, 2007, which sets forth the procedures followed, assumptions made, matters considered and qualifications and limitations on the review undertaken by Merrill Lynch, is attached as Annex B to this proxy statement. The summary of Merrill Lynch’s opinion set forth below is qualified in its entirety by reference to the full text of the opinion. Our shareholders are urged to read the opinion carefully in its entirety.
 
The Merrill Lynch opinion was addressed to our board of directors for its use and benefit and only addresses the fairness, from a financial point of view, as of the date of the opinion, of the consideration to be paid by us in connection with the Stock Purchase. The opinion does not address the merits of our underlying decision to engage in the Stock Purchase and does not constitute, nor should it be construed as, a recommendation as to how any of our stockholders should vote with respect to the proposed stock issuance or any other matter. In addition, Merrill Lynch was not asked to address nor does its opinion address the fairness to, or any other consideration of, the holders of any class of securities, creditors or other constituencies of ours.
 
In preparing its opinion to our board of directors, Merrill Lynch performed various financial and comparative analyses, including those described below. The summary set forth below does not purport to be a complete description of the analyses underlying Merrill Lynch’s opinion or the presentation made by Merrill Lynch to our board of directors. The preparation of a fairness opinion is a complex analytic process involving


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various determinations as to the most appropriate and relevant methods of financial analysis and the application of those methods to the particular circumstances and, therefore, a fairness opinion is not readily susceptible to partial analysis or summary description. In arriving at its opinion, Merrill Lynch did not attribute any particular weight to any analysis or factor considered by it, but rather made its determination as to fairness on the basis of its experience and professional judgment after considering the results of all of its analyses. Accordingly, Merrill Lynch believes that its analyses must be considered as a whole and that selecting portions of its analyses and factors, or focusing on information presented in tabular format, without considering all of the analyses and factors or the narrative description of the analyses, would create a misleading or incomplete view of the process underlying its opinion.
 
In performing its analyses, Merrill Lynch made numerous assumptions with respect to industry performance, general business, economic, market and financial conditions and other matters, many of which are beyond the control of Merrill Lynch, us or the MDS Entities. Any estimates contained in the analyses performed by Merrill Lynch are not necessarily indicative of actual values or future results, which may be significantly more or less favorable than those suggested by such analyses. Additionally, estimates of the value of businesses or securities do not purport to be appraisals or to reflect the prices at which such businesses or securities might actually be sold. Accordingly, such analyses and estimates are inherently subject to substantial uncertainty. In addition, as described above, Merrill Lynch’s opinion was among several factors taken into consideration by our board of directors in making its determination to approve the stock purchase agreement and the Stock Purchase. Consequently, Merrill Lynch’s analyses should not be viewed as determinative of the decision of our board of directors to enter into the stock purchase agreement or to engage in the Stock Purchase.
 
In arriving at its opinion, Merrill Lynch, among other things:
 
  •  reviewed certain publicly available business and financial information relating to us that Merrill Lynch deemed to be relevant;
 
  •  reviewed certain information, including financial forecasts, relating to the business, earnings, cash flow, assets, liabilities and prospects of us and Medisystems;
 
  •  conducted discussions with members of senior management of Medisystems and NxStage concerning the matters described in the preceding two bullet points, as well as their respective businesses and prospects before and after giving effect to the Stock Purchase;
 
  •  reviewed the market prices and valuation multiples for our common stock and for certain publicly traded companies that Merrill Lynch deemed to be relevant;
 
  •  reviewed the results of operations of Medisystems and compared them with those of certain publicly traded companies that Merrill Lynch deemed to be relevant;
 
  •  compared the proposed financial terms of the Stock Purchase with the financial terms of certain other transactions that Merrill Lynch deemed to be relevant;
 
  •  participated in certain discussions and negotiations among representatives of Medisystems and NxStage and their financial and legal advisors;
 
  •  reviewed the potential pro forma impact of the Stock Purchase on our business;
 
  •  reviewed the stock purchase agreement, the license agreement between DSU Medical Corporation and MDS, and the form of consulting agreement to be entered into by and among us, DSU Medical Corporation and Mr. Utterberg; and
 
  •  reviewed such other financial studies and analyses and took into account such other matters as Merrill Lynch deemed necessary, including its assessment of general economic, market and monetary conditions.
 
In preparing its opinion, Merrill Lynch assumed and relied on the accuracy and completeness of all information supplied or otherwise made available to it, discussed with or reviewed by or for it, or that was


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publicly available. Merrill Lynch did not assume any responsibility for independently verifying such information and did not undertake any independent evaluation or appraisal of any of the assets or liabilities of NxStage or Medisystems and it was not furnished with any such evaluation or appraisal, nor did it evaluate the solvency or fair value of NxStage or Medisystems under any state or federal laws relating to bankruptcy, insolvency or similar matters. In addition, Merrill Lynch did not assume any obligation to conduct any physical inspection of the properties or facilities of NxStage or Medisystems. With respect to the financial forecast information furnished to or discussed with Merrill Lynch by Medisystems or NxStage, Merrill Lynch assumed that this information had been reasonably prepared and reflected the best currently available estimates and judgment of NxStage’s or Medisystems’ management as to the expected future financial performance of NxStage or Medisystems, as the case may be. Merrill Lynch expressed no opinion as to such financial forecast information or the assumptions on which it was based.
 
The opinion of Merrill Lynch is necessarily based upon market, economic and other conditions as they existed and could be evaluated on, and on the information made available to Merrill Lynch as of, June 4, 2007, the date of its written opinion. Merrill Lynch has no obligation to update its opinion to take into account events occurring after the date that its opinion was delivered to our board of directors. Circumstances could develop prior to consummation of the Stock Purchase that, if known at the time Merrill Lynch rendered its opinion, would have altered its opinion.
 
Merrill Lynch assumed that in the course of obtaining the necessary regulatory or other consents or approvals, contractual or otherwise, for the Stock Purchase, no restrictions, including any divestiture requirements or amendments or modifications, will be imposed that will have a material adverse effect on the contemplated benefits of the Stock Purchase. Merrill Lynch did not express any opinion as to the prices at which our common stock would trade following the announcement or the consummation of the Stock Purchase. Although Merrill Lynch evaluated the fairness, from a financial point of view, of the consideration, Merrill Lynch was not requested to, and did not, recommend the specific consideration payable in the Stock Purchase, which consideration was determined through negotiations between us and Mr. Utterberg and approved by our board of directors.
 
Merrill Lynch assumed that the representations and warranties of each party contained in the stock purchase agreement were true and correct as of June 4, 2007, the date of its written opinion, that each party will perform all of its respective covenants and agreements contained in the stock purchase agreement and that the Stock Purchase will be consumed in accordance with the terms of the stock purchase agreement without waiver, modification or amendment. Merrill Lynch does not render accounting, legal, tax or intellectual property advice and understood that we were relying upon our own accounting, legal, tax and intellectual property advisors as to accounting, tax, legal and intellectual property matters in connection with the Stock Purchase.
 
The following is a summary of the material analyses performed by Merrill Lynch in connection with its opinion to our board of directors dated June 4, 2007. Some of the financial analyses summarized below include information presented in tabular format. In order to understand fully Merrill Lynch’s financial analyses, the tables must be read together with the text of the summary. The tables alone do not constitute a complete description of the financial analyses. Considering the data set forth below without considering the full narrative description of the financial analyses, including the methodologies and assumptions underlying the analyses, could create a misleading or incomplete view of Merrill Lynch’s financial analyses.
 
Analysis of Selected Comparable Publicly Traded Companies. Using publicly available information, Merrill Lynch compared financial and operating information and ratios for Medisystems with the corresponding information for a selected group of publicly traded companies. Merrill Lynch selected these companies because they engage in businesses and have operating profiles reasonably similar to those of Medisystems. The selected companies were:
 
  •  Greatbatch;
 
  •  Zoll Medical;


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  •  Cantel Medical;
 
  •  Medical Action Industries; and
 
  •  Microtek Medical.
 
Merrill Lynch calculated an equity value for each of these companies based on their respective closing share prices as of June 1, 2007 and the number of shares, options and convertible securities outstanding as reflected in publicly available information. Using these equity values, Merrill Lynch calculated an enterprise value for each company by adding to these equity values the amount of each company’s net debt, preferred stock and minority interest as reflected in its most recent publicly available balance sheet.
 
Using estimates of earnings before interest, taxes, depreciation and amortization, or EBITDA, and earnings per share, or EPS, for each of these companies derived from estimates published by selected Wall Street research analysts, Merrill Lynch calculated the following multiples for each company:
 
  •  Enterprise value as a multiple of revenue based on calendar year 2006 or CY 2006, revenue and calendar year 2007 and 2008, or CY 2007 and CY 2008, respectively, estimated revenues;
 
  •  Enterprise value as a multiple of EBITDA based on CY 2006 EBITDA and CY 2007 and 2008 estimated EBITDA;
 
  •  Price/earnings, or P/E multiples, based on CY 2007 and 2008 estimated EPS and the closing share price as of June 1, 2007; and
 
  •  Price/earnings to growth, or PEG multiples, based on CY 2007 and 2008 estimated EPS, the closing share price as of June 1, 2007 and the Long-term EPS Growth Rate.
 
Merrill Lynch also calculated similar implied multiples for us using an enterprise value and a share price for us based on our closing share price of $12.09 as of June 1, 2007, the last trading day before the meeting of the board of directors at which the board of directors approved the Stock Purchase and the stock purchase agreement, and estimates of revenue reflected in Wall Street research.
 
Merrill Lynch compared the maximum, mean, median and minimum implied multiples it calculated for the comparable companies to the implied multiples it calculated for us. The results of Merrill Lynch’s comparison are reflected in the following table:
 
                                                                                 
    CY 2006
  CY 2007E
  CY 2008E
  CY 2006
  CY 2007E
  CY 2008E
               
    Revenue
  Revenue
  Revenue
  EBITDA
  EBITDA
  EBITDA
  CY 2007E
  CY 2008E
  CY 2007E
  CY 2008E
    Multiple   Multiple   Multiple   Multiple   Multiple   Multiple   P/E Multiple   P/E Multiple   PEG   PEG
 
Maximum
    2.65x       2.34x       2.12x       13.2x       10.8x       8.5x       27.0x       22.2x       2.07x       1.71x  
Mean
    1.69x       1.44x       1.61x       11.9x       9.5x       8.2x       23.2x       18.4x       1.50x       1.33x  
Median
    1.43x       1.20x       1.61x       11.9x       9.4x       8.2x       21.6x       17.5x       1.38x       1.30x  
Minimum
    1.34x       1.06x       1.09x       10.8x       7.9x       8.0x       20.2x       16.8x       1.17x       0.97x  
NxStage
    15.06x       7.13x       3.55x       NA       NA       NA       NA       NA       NA       NA  
 
Based on the foregoing and Merrill Lynch’s analyses of the various comparable companies and on qualitative judgments involving non-mathematical considerations, Merrill Lynch applied multiples ranging from:
 
  •  1.35x to 1.65x to the fiscal 2006 revenue and calculated implied enterprise values for Medisystems ranging from $89 million to $109 million as compared to the $79 million transaction value;
 
  •  11.0x to 13.0x to the fiscal 2006 EBITDA and calculated implied enterprise values for Medisystems ranging from $83 million to $98 million as compared to the $79 million transaction value;
 
  •  1.10x to 1.50x to our management’s estimates of fiscal 2007 revenue and calculated implied enterprise values for Medisystems ranging from $79 million to $107 million based on the fiscal 2007 revenue estimate derived from the management projections as compared to the $79 million transaction value; and


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  •  8.0x to 11.0x to our management’s estimates of fiscal 2007 EBITDA and calculated implied enterprise values for Medisystems ranging from $110 million to $151 million based on the fiscal 2007 EBITDA estimate derived from the management projections as compared to the $79 million transaction value.
 
None of the selected comparable companies is identical to Medisystems. Accordingly, a complete analysis of the results of the foregoing calculations cannot be limited to a quantitative review of the results and involves complex considerations and judgments concerning differences in financial and operating characteristics of the selected comparable companies and other factors that could affect the public trading dynamics of the selected comparable companies.
 
Analysis of Selected Comparable Acquisitions.  Using publicly available information, Merrill Lynch calculated the multiple of revenue and EBITDA for Medisystems reflected by the transaction value of each of the transactions listed below.
 
             
Date Announced
  Acquiror   Target  
 
4/30/2007
  Greatbatch     Enpath Medical  
6/30/2006
  Blackstone Group     Encore Medical  
4/20/2006
  Integra LifeSciences     Miltex, Inc.  
3/8/2006
  Philips     Witt Biomedical  
2/27/2006
  Orthopedics, Inc.      Aircast Inc.  
2/21/2006
  Coherent     Excel Technology  
9/7/2005
  Integra LifeSciences     Radionics  
6/16/2005
  Gyrus Corp     ACMI Corp  
1/18/2005
  Elekta AB     Impac Medical Systems  
8/9/2004
  Encore Medical     Empi, Inc.  
 
Merrill Lynch calculated the transaction value for each transaction by multiplying the amount of the announced per share consideration paid or payable in each transaction by the number of fully-diluted outstanding shares of the target company based upon publicly available information and adding to the result the amount of the company’s net debt as of the date of the target company’s most recent balance sheet prior to announcement of the transaction.
 
For each of the transactions, Merrill Lynch calculated the transaction value as a multiple of revenue and EBITDA for the most recently reported 12 months prior to the date of announcement of the transaction, which we refer to as the LTM Revenue Multiple and the LTM EBITDA Multiple. The average LTM Revenue Multiple for all the transactions was 2.46x and the average LTM EBITDA Multiple for all the transactions, was 14.2x.
 
Based on the foregoing and Merrill Lynch’s analyses of the various transactions and on qualitative judgments involving non-mathematical considerations, Merrill Lynch applied multiples ranging from:
 
  •  1.60x to 2.60x to the revenue for the last 12 months as of March 31, 2007 and calculated implied enterprise values for Medisystems ranging from $106 million to $173 million as compared to the $79 million transaction value; and
 
  •  9.0x to 18.0x to the LTM EBITDA as of March 31, 2007 to derive a range of implied enterprise values for Medisystems and calculated implied enterprise values for Medisystems ranging from $77 million to $154 million as compared to the $79 million transaction value.
 
None of the transactions analyzed by Merrill Lynch is identical to the proposed transaction. Accordingly, a complete analysis of the results of the foregoing calculations cannot be limited to a quantitative review of the results and involves complex considerations and judgments concerning differences in financial and operating characteristics of the companies party to those transactions as well as the transactions and other factors that could affect the proposed Stock Purchase.


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Discounted Cash Flow Analysis.  Merrill Lynch performed a discounted cash flow analysis of the estimated free cash flows of Medisystems’ business (exclusive of its contract with us described below) reflected in the management projections. Merrill Lynch also performed a discounted cash flow analysis of the estimated free cash flows expected to be derived from the contract between Medisystems and us pursuant to which Medisystems has agreed to provide disposable cartridges to us for a seven-year term reflected in the management projections. In performing its discounted cash flow analysis of Medisystems’ business (exclusive of our contract with Medisystems), Merrill Lynch calculated ranges of the present value as of June 30, 2007 of the estimated free cash flows of Medisystems’ business (exclusive of our contract with Medisystems) over the period from the third quarter of 2007 through fiscal 2014 by applying discount rates ranging from 12.5%-15.0% to those estimates. In addition, Merrill Lynch calculated ranges of the present value as of June 30, 2007 of the estimated Terminal Value of the Medisystems’ business (exclusive of our contract with Medisystems), based on applying a perpetuity growth rate of 0.0% to the fiscal 2014 free cash flow and applying discount rates ranging from 12.5%-15.0%. In performing its discounted cash flow analysis of our contract with Medisystems, Merrill Lynch calculated ranges of the present value as of June 30, 2007 of the estimated free cash flows of our contract with Medisystems over the period from the third quarter of 2007 through fiscal 2014 by applying discount rates ranging from 15.0%-17.5%. No Terminal Value was calculated for our contract with Medisystems because the agreement exists for a finite period of seven years. Merrill Lynch added together the net present value ranges as of June 30, 2007 that it derived for Medisystems’ business (exclusive of the NxStage Contract) and for our contract with Medisystems. Based upon the foregoing, Merrill Lynch calculated an implied net present value of the estimated future cash flows of Medisystems ranging from $126 million to $150 million as compared to the $79 million transaction value.
 
The discount rates utilized in these analyses were based on Merrill Lynch’s estimates of the weighted average cost of capital of both Medisystems and us, based on its review of publicly available business and financial information of Medisystems and us, and the respective business and financial characteristics of comparable companies, respectively. In performing its weighted average cost of capital analysis of Medisystems, Merrill Lynch compared financial and business characteristics of comparable mature, steady growth medical device companies. In performing its weighted average cost of capital analysis of NxStage, Merrill Lynch compared financial and business characteristics of comparable high growth medical device companies.
 
Pro Forma Stock Purchase Analysis.  Merrill Lynch analyzed the pro forma impact of the proposed Stock Purchase on our EPS for the fiscal years ending December 31, 2007, 2008, 2009, 2010 and 2011. For purposes of this analysis Merrill Lynch used the financial information and projections provided by our management. Based on this analysis, Merrill Lynch concluded that the proposed Stock Purchase would be accretive to our EPS in 2007 and subsequent years.
 
Other Factors.  In the course of preparing its opinion, Merrill Lynch also reviewed and considered other information and data, including the following:
 
  •  our trading characteristics;
 
  •  historical market prices for our common stock;
 
  •  our financial, operating and stock market data and selected publicly traded companies in the specialty medical technology industry; and
 
  •  selected research analysts reports on NxStage, including stock price estimates of those analysts.
 
General.  Merrill Lynch is an internationally recognized investment banking and advisory firm. As part of its investment banking business, Merrill Lynch is continuously engaged in the valuation of businesses and securities in connection with mergers and acquisitions, negotiated underwritings, competitive biddings, secondary distributions of listed and unlisted securities, private placements and valuations for corporate and other purposes. The board of directors selected Merrill Lynch as its financial adviser because of Merrill Lynch’s qualifications, expertise and reputation.


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Under the terms of its engagement, we have agreed to pay Merrill Lynch a fee for its services, which is contingent upon the consummation of the Stock Purchase. In addition, we have agreed to reimburse Merrill Lynch for its reasonable out-of-pocket expenses incurred in connection with providing its services and to indemnify Merrill Lynch, its affiliates and related parties against certain liabilities arising out of Merrill Lynch’s engagement.
 
Merrill Lynch has, in the past, provided financial advisory and financing services to us and our affiliates and may continue to do so and has received, and may receive, fees for the rendering of such services. In addition, in the ordinary course of its business, Merrill Lynch may actively trade our common stock and our other securities for its own account and for the accounts of customers and, accordingly, may at any time hold a long or short position in such securities.
Comment:  link1 "Interests of Mr. Utterberg in the Stock Purchase"
 
Interests of Mr. Utterberg in the Stock Purchase
 
When considering the recommendation of our board of directors, you should be aware that Mr. Utterberg, a NxStage director, has interests in the Stock Purchase that are different from yours. Mr. Utterberg owns, directly or indirectly, all of the equity interests that we are purchasing in the MDS Entities. Accordingly, Mr. Utterberg will receive 6,500,000 shares of our common stock, subject to a post-closing working capital adjustment, if the Stock Purchase is approved and completed. As a result, Mr. Utterberg’s aggregate ownership of our outstanding stock will increase to approximately 23.4% of our outstanding common stock if he receives 6,500,000 shares. As of June 4, 2007, the last trading day prior to the announcement of the Stock Purchase, the aggregate market value of the 6,500,000 shares of common stock issuable to Mr. Utterberg was $78.7 million, based on a per share price of $12.11, which was the last sales price of our common stock on the NASDAQ Global Market on that day.
 
We have agreed that following the Stock Purchase, Mr. Utterberg will have “piggyback” registration rights if we propose to register shares of our common stock under the Securities Act of 1933, as amended. We will provide Mr. Utterberg with notice of a registration of our shares and provide Mr. Utterberg with the opportunity to include the shares he received in the Stock Purchase in the registration, subject to certain cut back and lock-up restrictions. In addition, we have agreed to register for resale the shares issued to Mr. Utterberg as consideration for the Stock Purchase in the event that he ceases to be an affiliate of NxStage prior to the time the holding period under Rule 144(k) lapses as to such shares.
 
Additionally, in connection with the Stock Purchase we will enter into a two-year consulting agreement with Mr. Utterberg. Under the consulting agreement, Mr. Utterberg will receive aggregate payments from us of $200,000 per year, plus expenses. The terms of the consulting agreement are more fully detailed in this proxy statement under the heading “License Agreement and Consulting Agreement” beginning on page 75.
 
Following the Stock Purchase, Mr. Utterberg will continue to serve on our board of directors. In addition, the stock purchase agreement provides that, if Mr. Utterberg is no longer a director of NxStage, our board of directors will nominate for election to our board any director nominee proposed by Mr. Utterberg, subject to certain conditions.
 
Our board of directors took into account these interests in considering whether to approve the Stock Purchase. Mr. Utterberg did not participate in discussions held by our board of directors concerning these transactions, nor did he participate in the board votes authorizing these transactions.
Comment:  link1 "Our Current Relationship with Mr. Utterberg"
 
Our Current Relationship with Mr. Utterberg
 
Currently, Medisystems supplies the completed disposable cartridges used with our System One product. We purchased approximately $4.6 million of goods and services during fiscal 2006 from Medisystems. In January 2007, we entered into a seven-year agreement with Medisystems pursuant to which Medisystems will supply to us no less than 90% of our North American requirements for disposable cartridges for use with the System One. If the Stock Purchase is approved by our stockholders, following the closing we intend to terminate this supply agreement.


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Comment:  link1 "Intellectual Property"
 
Intellectual Property
 
We will not acquire patents in connection with the Stock Purchase. All patented intellectual property presently used in connection with the business of the MDE Entities is licensed by MDS from DSU under a perpetual, royalty-free, fully paid license agreement entered into between the parties on June 1, 2007. For a description of the license agreement, see “License Agreement and Consulting Agreement” on page 75.
Comment:  link1 "Stock Purchase Consideration"
 
Stock Purchase Consideration
 
Base Purchase Price
 
Upon the closing of the Stock Purchase, we will issue Mr. Utterberg 6,500,000 shares of our common stock. The total number of shares payable by us to Mr. Utterberg is also subject to a post-closing working capital adjustment as discussed below.
 
Working Capital Adjustment Following Closing
 
Following the closing of the Stock Purchase, we and Mr. Utterberg will determine the amount of working capital held by the MDS Entities as of the closing. We and Mr. Utterberg have agreed to a targeted working capital amount as of closing equal to negative $1,850,000, which amount will be increased by the sum of the amount of Medisystems’ net income, plus depreciation and amortization for the period from January 1, 2007 through the closing of the Stock Purchase, and decreased by the sum of the amounts of (1) the royalties payable under the license agreement between MDS and DSU, described below, (2) cash dividends equal to $55,000 per month for each month from January 1, 2007 through the closing of the Stock Purchase, (3) cash dividends payable to Mr. Utterberg pursuant to the stock purchase agreement for reimbursement of tax liability with respect to Medisystems and (4) the amount of Medisystems’ capital expenditures permitted under the terms of the stock purchase agreement for the period from January 1, 2007 through the closing of the Stock Purchase. The base purchase price payable by us to Mr. Utterberg will be adjusted depending on whether the amount of working capital at closing is greater than or less than this targeted working capital amount by $250,000 or more. The amount of the working capital adjustment will not be known until at least 60 days following the closing and, therefore, the total amount of the shares of our common stock to be paid to Mr. Utterberg will not be known until following the closing.
 
Escrow Arrangements
 
At the closing of the Stock Purchase, 1,000,000 of the 6,500,000 shares payable by us to Mr. Utterberg will be placed into escrow to cover potential indemnification claims we may have against Mr. Utterberg. The escrow fund will have a duration of two years following the closing of the Stock Purchase, with 500,000 shares released after the first year. For further information about the parties’ respective indemnification obligations, see ‘‘The Stock Purchase Agreement — Indemnification” beginning on page 74.
Comment:  link1 "Lien on Medisystems’ Assets"
 
Lien on Medisystems’ Assets
 
All of the assets held by the MDS Entities are currently subject to a lien. In January 2003, the Medisystems Group entered into a credit agreement with KeyBank National Association, pursuant to which all of the assets of each Medisystems Group company have been pledged as collateral. The credit agreement provides for a $3.5 million revolving line of credit and a $1.5 million demand line of credit. As of July 25, 2007, there were no amounts outstanding under the revolving line of credit and Medisystems Group had issued approximately $812,000 of standby letters of credit. We expect that at or prior to the closing of the Stock Purchase, any surviving obligations against the Medisystems Groups’ credit commitments will be resolved by Medisystems and the credit commitments, other than the currently issued KeyBank letters of credit, which are securing guarantees of VAT refunds made to MDS Italy by one of the Italian banks. Medisystems has indicated that it will amend the KeyBank credit commitment prior to the closing of the Stock Purchase to remove from the commitment the Medisystems Group companies that we are not acquiring. However, removal of these entities from the KeyBank credit commitment is not within our control and is not a condition to closing.


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Medisystems Group companies that are not MDS Entities may borrow under the credit facility, and, if they default on any such obligation, we could be required to satisfy their obligations.
Comment:  link1 "Effective Time of the Stock Purchase"
 
Effective Time of the Stock Purchase
 
The closing of the Stock Purchase shall occur, and the Stock Purchase shall be effective, no later than two business days after the satisfaction or waiver of all the conditions and the obligations of NxStage and Mr. Utterberg to the transactions contemplated by the stock purchase agreement, including approval of the issuance of shares of NxStage common stock to Mr. Utterberg by our stockholders.
Comment:  link1 "Regulatory Approvals"
 
Regulatory Approvals
 
We are not aware of any governmental or regulatory approval required for completion of the Stock Purchase, other than compliance with the Hart-Scott Rodino Act, compliance with applicable corporate laws of Delaware, compliance with state securities laws and the filing with the NASDAQ Global Market of a Notification Form for Listing Additional Shares and a Notification Form for Change in the Number of Shares Outstanding, with respect to the shares of our common stock to be issued to Mr. Utterberg pursuant to the stock purchase agreement.
 
If any other governmental approvals or actions are required, we intend to try to obtain them. We cannot assure you, however, that we will be able to obtain any such approvals or actions.
Comment:  link1 "U.S. Federal Income Tax Consequences"
 
U.S. Federal Income Tax Consequences
 
No gain or loss will be recognized by us or by holders of shares of our common stock as a result of the Stock Purchase.
Comment:  link1 "NASDAQ Listing"
 
NASDAQ Listing
 
With respect to the shares of common stock issuable as consideration for the Stock Purchase, we have agreed with Mr. Utterberg to file with the NASDAQ Global Market a Notification Form for Listing Additional Shares and a Notification Form for Changes in the Number of Shares Outstanding.
Comment:  link1 "Restrictions on the Resale of the Stock Purchase Shares"
 
Restrictions on the Resale of the Stock Purchase Shares
 
Mr. Utterberg has agreed to certain resale restrictions on the Stock Purchase Shares. Notably, he may not sell or otherwise dispose of shares of our common stock acquired by him in short sales or in trades to a single party exceeding 250,000 shares, without our prior written consent. These restrictions will apply to the shares of our common stock acquired by Mr. Utterberg until the earlier of (1) a change in control of NxStage and (2) two years following the closing of the Stock Purchase.
 
In addition, Mr. Utterberg is currently a director of NxStage and, therefore, subject to the volume limitation on resales pursuant to Rule 144. Mr. Utterberg will continue to be subject to such restrictions for as long as he is a director and/or affiliate of NxStage.
Comment:  link1 "Registration Rights"
 
Registration Rights
 
We have agreed that following the Stock Purchase, Mr. Utterberg will have “piggyback” registration rights if we propose to register shares of our common stock under the Securities Act of 1933, as amended. We will provide Mr. Utterberg with notice of a registration of our shares and provide Mr. Utterberg with the opportunity to include the shares he received in the Stock Purchase in the registration, subject to certain cut back and lock-up restrictions. In addition, we have agreed to register for resale the shares issued to Mr. Utterberg as consideration for the Stock Purchase in the event that he ceases to be an affiliate of NxStage prior to the time the holding period under Rule 144(k) lapses as to such shares.


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 Comment:  link1 "THE STOCK PURCHASE AGREEMENT"
 
THE STOCK PURCHASE AGREEMENT
 
The following is a summary of the material terms of the stock purchase agreement, which is attached as Annex A to this proxy statement and is incorporated herein by reference. The stock purchase agreement has been attached to this document to provide you with information regarding its terms. It is not intended to provide any other factual information about us, Mr. Utterberg or the MDS Entities. The following description does not purport to be complete and is qualified in its entirety by reference to the stock purchase agreement. You should refer to the full text of the stock purchase agreement for details of the Stock Purchase and the terms and conditions of the stock purchase agreement.

 
General
 
Under the stock purchase agreement, we will acquire from Mr. Utterberg:
 
  •  all of the issued and outstanding shares of MDS;
 
  •  all of the issued and outstanding shares of MDS Services;
 
  •  90% the issued and outstanding shares of MDS Italy (the remaining equity of which is held by MDS); and
 
  •  0.273% of the issued and outstanding equity participation of MDS Mexico (the remaining equity of which is held by MDS).
 
The closing of the Stock Purchase will occur no later than the second business day after the last of the conditions to the Stock Purchase have been satisfied or waived, or at another time as the parties mutually agree. However, because the Stock Purchase is subject to a number of conditions, we cannot predict exactly when the closing will occur or if it will occur at all.
 Comment:  link1 "Stock Purchase Consideration and Adjustment"
 
Stock Purchase Consideration and Adjustment
 
At the closing of the Stock Purchase, Mr. Utterberg will receive 6,500,000 shares of our common stock as consideration for the Stock Purchase. Following the closing of the Stock Purchase, we and Mr. Utterberg will work to determine the amount of working capital held by the MDS Entities as of the closing. We and Mr. Utterberg have agreed to a targeted working capital amount as of closing equal to negative $1,850,000, subject to adjustment as provided in the stock purchase agreement. The base purchase price payable by us to Mr. Utterberg will be adjusted depending on whether the amount of working capital at closing is greater than or less than this targeted working capital amount by $250,000 or more. The amount of the working capital adjustment will not be known until at least 60 days following the closing and, therefore, the total amount of the shares of our common stock to be paid to Mr. Utterberg will not be known until following the closing.
 Comment:  link1 "Conditions to the Completion of the Stock Purchase"
 
Conditions to the Completion of the Stock Purchase
 
Each party’s obligation to complete the Stock Purchase is subject to the satisfaction or waiver by each of the parties, at or prior to the closing, of various conditions, which include the following:
 
  •  all applicable waiting periods, and any extensions thereof, under the Hart-Scott-Rodino Act will have expired or otherwise been terminated;
 
  •  each party will have obtained all of the waivers, permits, consents, approvals or other authorizations, and effected all of the registrations, filings and notices, required on the part of each party in the stock purchase agreement;
 
  •  certain of the representations and warranties by the other party in the stock purchase agreement, and any representations and warranties by the other party set forth in the stock purchase agreement that are qualified as to materiality will be true and correct in all respects, and all other representations and warranties of the other party set forth in the stock purchase agreement will be true and correct in all material respects, in each case as of the date of the stock purchase agreement and as of the date of the closing as though made as of the date of the closing, except to the extent such representations and


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  warranties are specifically made as of a particular date (in which case such representations and warranties will be true and correct as of such date);
 
  •  the other party will have performed or complied with the agreements and covenants required to be performed or complied with in the stock purchase agreement as of or prior to the closing;
 
  •  no legal proceeding will be pending or threatened in writing wherein an unfavorable judgment, order, decree, stipulation or injunction would (1) prevent consummation of the transactions contemplated by the stock purchase agreement, (2) cause the transactions contemplated by the stock purchase agreement to be rescinded following consummation or (3) have, individually or in the aggregate, a material adverse effect, and no such judgment, order, decree, stipulation or injunction will be in effect;
 
  •  the parties will have received (1) a duly executed escrow agreement; and (2) a duly executed consulting agreement; and
 
  •  each party will have delivered the documents required under the stock purchase agreement for the closing, including good standing certificates and certificates from certain officers.
 
Our obligation to complete the Stock Purchase is subject to the satisfaction or waiver, at or prior to the Stock Purchase, of various additional conditions, which include the following:
 
  •  our stockholders will have approved the issuance of shares of our common stock to Mr. Utterberg pursuant to the terms of the stock purchase agreement;
 
  •  we will have received the financial statements, information and other documents required to be provided by the stock purchase agreement;
 
  •  Mr. Utterberg will have caused each MDS Entity to hold a meeting of its stockholder(s) to approve the resignation of the outgoing directors and officers of each respective MDS Entity and the appointment of incoming directors and officers, as specified by us, effective as of the closing; and
 
  •  we will have received copies of the resignations, effective as of the closing, of each director and officer (in the case of MDS Italy, this will include the board of statutory auditors), of each of the MDS Entities, and such other documentation that may be required under relevant local law or reasonably requested by NxStage to implement the resignation of the outgoing directors and officers and the appointment of the incoming directors and officers, including full waivers from the outgoing directors releasing the MDS Entities from any claims.
 
Mr. Utterberg’s obligation to complete the Stock Purchase is subject to the satisfaction or waiver, at or prior to the Stock Purchase, of various additional conditions, which include the following:
 
  •  NxStage will have filed with NASDAQ (1) a notification form for listing of additional shares and (2) a notification form for change in the number of shares outstanding, with respect to the shares of our common stock issuable pursuant to the terms of stock purchase agreement.
 Comment:  link1 "No Solicitation"
 
No Solicitation
 
Mr. Utterberg has agreed he will not, and will cause each of the MDS Entities not to, and will cause each of the MDS Entities to require each of its officers, directors, employees, representatives and agents not to, directly or indirectly:
 
  •  initiate, solicit, encourage or otherwise facilitate any inquiry, proposal, offer or discussion with any party (other than NxStage) concerning any merger, reorganization, consolidation, recapitalization, business combination, liquidation, dissolution, share exchange, sale of stock, sale of material assets or similar business transaction involving any of the MDS Entities or any division of any of the MDS Entities;
 
  •  furnish any non-public information concerning the business, properties or assets of any of the MDS Entities or any division of any of the MDS Entities to any party (other than NxStage); or


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  •  engage in discussions or negotiations with any party (other than NxStage) concerning any such transaction.
 
Mr. Utterberg has also agreed to, and to cause each of the MDS Entities to, immediately notify any party with which discussions or negotiations of the nature described above were pending that Mr. Utterberg or the MDS Entities, as the case may be, is terminating such discussions or negotiations. If Mr. Utterberg or any of the MDS Entities receives any inquiry, proposal or offer of the nature described above, Mr. Utterberg has agreed to, or cause the MDS Entities to, as the case may be, to, within one business day after receipt, notify us of such inquiry, proposal or offer, including the identity of the other party and the terms of the inquiry, proposal or offer.
 Comment:  link1 "Meeting of Stockholders"
 
Meeting of Stockholders
 
We are obligated under the stock purchase agreement to hold and convene a special meeting of our stockholders for purposes of considering the issuance of the Stock Purchase Shares. We are required to prepare and file a proxy statement with the SEC and distribute it to our stockholders for the purpose of convening the special meeting and obtaining stockholder approval.
 Comment:  link1 "Covenants, Conduct of Business Pending the Stock Purchase"
 
Covenants, Conduct of Business Pending the Stock Purchase
 
Mr. Utterberg has agreed to cause each of the MDS Entities to conduct its operations in the ordinary course of business and in compliance with all applicable laws and regulations and, to the extent consistent therewith, use its reasonable best efforts to preserve intact its current business organization, keep its physical assets in good working condition, keep available the services of its current officers and employees and preserve its relationships with customers, suppliers and others having business dealings with it to ensure that its goodwill and ongoing business will not be impaired in any material respect. Prior to the closing, Mr. Utterberg has agreed to prevent each of the MDS Entities from doing any of the following without our written consent:
 
  •  issue or sell any stock, or equity participation or other securities of any MDS Entity or any options, warrants or rights to acquire any such stock, or equity participation or other securities, or repurchase or redeem any stock, or equity participation or other securities of any MDS Entity;
 
  •  split, combine or reclassify any shares of or equity participation in its capital stock; or declare, set aside or pay any dividend or other distribution (whether in cash, stock or property or any combination thereof) in respect of its capital stock;
 
  •  create, incur or assume any indebtedness (including obligations in respect of capital leases); assume, guarantee, endorse or otherwise become liable or responsible (whether directly, contingently or otherwise) for the obligations of any other person or entity; or make any loans, advances or capital contributions to, or investments in, any other person or entity;
 
  •  enter into, adopt or amend any employee benefit plan or any employment or severance agreement or arrangement described in the stock purchase agreement or (except for normal increases in the ordinary course of business for employees who are not affiliates) increase in any manner the compensation or fringe benefits of, or materially modify the employment terms of, its directors, officers or employees, generally or individually, or pay any bonus or other benefit to its directors, officers or employees (except for certain existing payment obligations set forth in the stock purchase agreement) or hire any new officers or (except in the ordinary course of business) any new employees;
 
  •  acquire, sell, lease, license or dispose of any assets or property (including any shares or other equity interests in or securities of any subsidiary or any corporation, partnership, association or other business organization or division thereof), other than purchases and sales of assets in the ordinary course of business;
 
  •  mortgage or pledge any of its property or assets or subject any property or assets to any security interest;


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  •  discharge or satisfy any security interest or pay any obligation or liability other than in the ordinary course of business;
 
  •  amend its charter, bylaws or other organizational documents;
 
  •  change its accounting methods, principles or practices, except as may be required by a generally applicable change in GAAP or make any new elections, or changes to any current elections, with respect to taxes;
 
  •  enter into, amend, terminate, take or omit to take any action that would constitute a violation of or default under, or waive any rights under, any contract or agreement of a nature described in the stock purchase agreement;
 
  •  make or commit to make any capital expenditure in excess of $10,000 per item or $50,000 in the aggregate, other than amounts set forth in the capital budget of the MDS Entities for 2007;
 
  •  institute or settle any legal proceeding;
 
  •  take any action or fail to take any action permitted by the stock purchase agreement with the knowledge that the action or failure to take action would result in (1) any of the representations and warranties of Mr. Utterberg set forth in stock purchase agreement becoming untrue or (2) certain conditions set forth in the stock purchase agreement not being satisfied; or
 
  •  agree in writing or otherwise to take any of the above actions.
 Comment:  link1 "Other Agreements"
 
Other Agreements
 
We and Mr. Utterberg have agreed to use reasonable best efforts to:
 
  •  take all actions necessary to complete the Stock Purchase;
 
  •  obtain all waivers, permits, consents, approvals or authorizations from governmental entities required in connection with the transactions; and
 
  •  effect all registrations, filings and notices with or to governmental entities required in connection with the transactions.
 
We and Mr. Utterberg have agreed that:
 
  •  Mr. Utterberg will use reasonable best efforts to obtain all waivers, consents or approvals from third parties and give all notices to third parties as specified in the stock purchase agreement;
 
  •  Mr. Utterberg will cause each of the MDS Entities to provide us with access to certain information relating to the MDS Entities;
 
  •  Mr. Utterberg will cause the MDS Entities to provide information and otherwise assist in the preparation of certain financial statements relating to the MDS Entities and us;
 
  •  Each party will provide the other with notice of any changes that would make the representations and warranties untrue or inaccurate, cause a breach of any covenant, or cause a material adverse effect on the MDS Entities or us, respectively;
 
  •  We will make certain filings with NASDAQ to list the shares of our common stock issued to Mr. Utterberg in connection with the Stock Purchase;
 
  •  Mr. Utterberg will cause the MDS Entities to satisfy certain obligations and liabilities identified in the stock purchase agreement;
 
  •  Mr. Utterberg and his affiliates will maintain in confidence certain information about the MDS Entities;
 
  •  Mr. Utterberg will not solicit or hire former employees of the MDS Entities for two years following the closing;


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  •  Mr. Utterberg will be subject to certain restrictions on resale of shares of our common stock after the Stock Purchase;
 
  •  Mr. Utterberg will be restricted from acquiring additional shares of our common stock for two years following the closing;
 
  •  Mr. Utterberg will have certain director nomination rights after he completes his service on our board of directors;
 
  •  We will maintain and provide for certain matters relating to employees and employee benefit plans;
 
  •  We will acquire and maintain product liability insurance relating to the MDS Entities’ products for six years following the closing; and
 
  •  We will continue to honor certain indemnification rights of the MDS Entity directors and officers for six years following the closing.
 
Registration Rights
 
We have agreed that following the Stock Purchase, Mr. Utterberg will have “piggyback” registration rights if we propose to register shares of our common stock under the Securities Act of 1933, as amended. We will provide Mr. Utterberg with notice of a registration of our shares and provide him with the opportunity to include the shares he received in the Stock Purchase in the registration, subject to certain cut back and lock-up restrictions. In addition, we have agreed to register for resale the shares issued to Mr. Utterberg as consideration for the Stock Purchase in the event he ceases to be an affiliate of NxStage prior to the time the holding period under Rule 144(k) lapses as to such shares.
 
Termination
 
The stock purchase agreement may be terminated at any time prior to the closing, whether before or after we have obtained stockholder approval:
 
  •  by mutual written consent of us and Mr. Utterberg;
 
  •  by us by giving written notice to Mr. Utterberg in the event he is in breach of any representation, warranty or covenant contained in the stock purchase agreement, and such breach (1) individually or in combination with any other such breach, would cause certain conditions not to be satisfied and (2) is not cured within 20 days following delivery by us to Mr. Utterberg of written notice of such breach;
 
  •  by Mr. Utterberg by giving written notice to us in the event we are in breach of any representation, warranty or covenant contained in the stock purchase agreement, and such breach (1) individually or in combination with any other such breach, would cause certain conditions not to be satisfied and (2) is not cured within 20 days following delivery by Mr. Utterberg to us of written notice of such breach;
 
  •  by either us or Mr. Utterberg by giving written notice to the other party at any time after our stockholders have voted on whether to approve the issuance of our common stock in the event the proposed issuance of our common stock failed to receive the approval of our stockholders; or
 
  •  by either of us by giving written notice to the other if the closing will not have occurred on or before December 31, 2007 by reason of the failure of any condition precedent required by the stock purchase agreement (unless the failure results primarily from a breach of any representation, warranty or covenant contained in the stock purchase agreement by the party providing notice).
Comment:  link1 "Expenses and Reimbursement"
 
Expenses and Reimbursement
 
If the stock purchase agreement is terminated as a result of our board of directors’ decision to modify or withdraw its recommendation to our stockholders, we agree to reimburse Mr. Utterberg up to $600,000 for reasonable expenses incurred by him relating to the stock purchase agreement.


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Except as set forth in the preceding sentence, all fees and expenses incurred in connection with the Stock Purchase, the stock purchase agreement and the transactions contemplated by the stock purchase agreement will be paid by the party incurring such fees or expenses.
Comment:  link1 "Representations and Warranties"
 
Representations and Warranties
 
The stock purchase agreement contains customary representations and warranties of Mr. Utterberg on behalf of himself and the MDS Entities relating to, among other things:
 
  •  title;
 
  •  noncontravention;
 
  •  appropriate approvals;
 
  •  residency;
 
  •  corporate organization, qualification and corporate power;
 
  •  capital structure;
 
  •  authorization, due execution and delivery of the stock purchase agreement;
 
  •  subsidiaries;
 
  •  financial statements;
 
  •  absence of material changes;
 
  •  undisclosed liabilities;
 
  •  certain tax matters;
 
  •  ownership of assets and real property;
 
  •  certain matters relating to real property leases;
 
  •  intellectual property;
 
  •  inventory;
 
  •  the validity of material contracts to which the parties or their subsidiaries are a party and the absence of any violation, default or breach to such contracts;
 
  •  accounts receivable;
 
  •  powers of attorney;
 
  •  insurance;
 
  •  litigation matters;
 
  •  warranties;
 
  •  employees, employee benefits and related matters;
 
  •  environmental matters;
 
  •  compliance with certain laws;
 
  •  customers and suppliers;
 
  •  permits;
 
  •  certain business relationships with affiliates;
 
  •  the absence of brokerage or finders’ fees or agents’ commissions;
 
  •  books and records;
 
  •  disclosure;
 
  •  controls and procedures;
 
  •  governmental contracts;


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  •  questionable payments;
 
  •  privacy and related matters;
 
  •  customs; and
 
  •  the absence of any conflicts or violations of each party’s agreements as a result of the Stock Purchase or the stock purchase agreement.
 
The stock purchase agreement contains certain customary representations and warranties of NxStage relating to, among other things:
 
  •  corporate organization, qualification and corporate power;
 
  •  capital structure;
 
  •  authorization, due execution and delivery of the stock purchase agreement;
 
  •  the absence of any conflicts or violations as a result of the stock purchase agreement or the Stock Purchase;
 
  •  the absence of required consents, other than those specified;
 
  •  compliance with reporting obligations;
 
  •  financial statements; and
 
  •  absence of material changes.
 
The representations and warranties are subject to materiality and knowledge qualifiers in many respects. With certain exceptions, the representations and warranties, will survive the Stock Purchase closing for 24 months. Certain of the representation and warranties will survive the closing beyond 24 months.
 
This description of the representations and warranties is included to provide investors with information regarding the terms of the stock purchase agreement. It is not intended to provide any other factual information about us, Mr. Utterberg or the MDS Entities. The assertions embodied in the representations and warranties are subject to qualifications and exceptions. Accordingly, you should not rely on the representations and warranties as characterizations of the actual state of facts at the time they were made or otherwise.
 
Indemnification
 
The stock purchase agreement and consulting agreement,which are described below, require Mr. Utterberg and us to indemnify each other in the event of certain breaches and failures under such agreements. Subject to certain limited exceptions, each party’s aggregate indemnification liability is limited to a maximum amount equal to 50% of the value of the shares of our common stock received in the Stock Purchase, measured as of the consummation of the Stock Purchase, minus $1,250,000. The agreements further provide that any amounts payable by either party in connection with any such indemnification claim be paid by delivery of additional shares of our common stock, valued at the time of payment. However, we will not be required to issue shares for indemnification purposes that in the aggregate would exceed 20% of the then outstanding shares of our common stock without stockholder approval. Any shares issued by us for indemnification purposes will not be registered under the Securities Act of 1933, as amended. Mr. Utterberg has agreed to place 1,000,000 of the shares he will receive as consideration for the Stock Purchase into escrow to secure his indemnification obligations to us and to satisfy any purchase price adjustments following the closing.


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 Comment:  link1 "LICENSE AGREEMENT AND CONSULTING AGREEMENT"
LICENSE AGREEMENT AND CONSULTING AGREEMENT
 
In connection with the Stock Purchase and as a result of MDS, one of the MDS Entities, becoming a direct or indirect wholly-owned subsidiary of ours, we will acquire rights under an existing license agreement between MDS and DSU Medical Corporation, a Nevada corporation, wholly-owned by Mr. Utterberg, or DSU. Additionally, as a condition to the parties’ obligations to consummate the Stock Purchase, Mr. Utterberg and DSU will enter into a consulting agreement with us. The license agreement and the consulting agreement are detailed further below.
 Comment:  link1 "License Agreement"
 
License Agreement
 
Under the license agreement dated as of June 1, 2007 by and between MDS and DSU, MDS received an exclusive, irrevocable, sublicensable, royalty-free, fully paid license to certain DSU patents, or the Licensed Patents, in exchange for a one-time payment of $2,661,000. The Licensed Patents fall into two categories, those patents that are used exclusively by the MDS Entities, referred to as the Class A Patents, and those patents that are used by the MDS Entities and other companies owned by Mr. Utterberg, referred to as the Class B Patents. Pursuant to the terms of the license agreement, MDS has a license to (1) the Class A Patents, to practice in all fields for any purpose and (2) the Class B Patents, solely with respect to certain defined products for use in the treatment of Extracorporeal Fluid Treatments and/or Renal Insufficiency Treatments. The license agreement further provides that MDS’ rights under the agreement are qualified by certain sublicenses previously granted to third parties. We have agreed that Mr. Utterberg will retain the right to the royalty income under one of these sublicenses.
 Comment:  link1 "Consulting Agreement"
 
Consulting Agreement
 
Under this consulting agreement, Mr. Utterberg and DSU will provide consulting, advisory and related services to us for a period of two years following the consummation of the Stock Purchase. In addition, under the terms of the consulting agreement, Mr. Utterberg and DSU will agree during the term of the agreement not to compete with us in the field defined in the consulting agreement and not to encourage or solicit any employees, customers or suppliers of ours to alter its relationship with us. The consulting agreement will further provide that (1) Mr. Utterberg and DSU will assign to us certain inventions and proprietary rights received by him/it during the term of the agreement and (2) we will grant Mr. Utterberg and DSU an exclusive, worldwide, perpetual, royalty-free irrevocable, sublicensable, fully paid license under such assigned inventions and proprietary rights for any purpose outside the inventing field, as defined in the consulting agreement. Under the terms of the consulting agreement, Mr. Utterberg and DSU will receive an aggregate of $200,000 per year, plus expenses, in full consideration for the services and other obligations provided for under the terms of the consulting agreement. The consulting agreement also requires us and Mr. Utterberg to indemnify each other in the event of certain breaches and failures under the agreement and requires that any such indemnification liability be satisfied with shares of our common stock, valued at the time of payment.


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Comment:  link1 "NxSTAGE BUSINESS"
 
NxSTAGE BUSINESS
Comment:  link1 "Recent Developments"
 
Recent Developments
 
In March 2006, we received clearance from the FDA to market our PureFlow SL module as an alternative to the bagged fluid presently used with our System One in the chronic care market, and we commercially launched the PureFlow SL module in July 2006. This accessory to the System One allows for the preparation of high purity dialysate in the patient’s home using ordinary tap water and dialysate concentrate.
 
We closed a follow-on public offering of our common stock on June 14, 2006, which resulted in the issuance of 6,325,000 shares of common stock at $8.75 per share. We received net proceeds from the offering of approximately $51.3 million.
 
At December 31, 2006, 1,022 ESRD patients were using the System One at 174 dialysis clinics, compared to 292 ESRD patients at 70 dialysis clinics at December 31, 2005. In addition, at December 31, 2006, 77 hospitals were using the System One for critical care therapy, compared to 50 hospitals at December 31, 2005.
 
Medisystems.  In January 2007, we entered into a seven-year agreement with Medisystems Corporation pursuant to which Medisystems will supply to us no less than 90% of our North American requirements for disposable cartridges for use with the System One. The agreement may be terminated upon a material breach, generally following a 120-day cure period. Medisystems is a related party to NxStage. David Utterberg, the president and sole stockholder of Medisystems, is a director and significant stockholder of the Company.
 
On June 4, 2007 we entered into a stock purchase agreement with Mr. Utterberg, who is a member of our board of directors and owns 6.7% of our outstanding common stock, pursuant to which we will acquire all of the outstanding equity of each MDS Entity and each MDS Entity will become a direct or indirect wholly-owned subsidiary of ours. Mr. Utterberg will receive 6,500,000 shares of our common stock, subject to a post-closing working capital adjustment as consideration for the Stock Purchase.
 
Membrana.  In January 2007, we entered into a long-term supply agreement with Membrana pursuant to which Membrana has agreed to supply, on an exclusive basis, capillary membranes for use in the filters used with the System One for ten years. In exchange for Membrana’s agreement to pricing reductions based on volumes ordered, we have agreed to purchase a base amount of membranes per year. The agreement may be terminated upon a material breach, generally following a 60-day cure period.
 
DaVita.  On February 7, 2007, we entered into a National Service Provider Agreement with DaVita, our largest customer. Pursuant to the terms of the agreement, we granted to DaVita certain market rights for the System One and related supplies for home hemodialysis therapy. We granted DaVita exclusive rights in a small percentage of geographies, which geographies collectively represent less than 10% of the U.S. ESRD patient population, and limited exclusivity in the majority of all other U.S. geographies, subject to DaVita’s meeting certain requirements, including patient volume commitments and new patient training rates. Under the agreement, we can continue to sell to other clinics in the majority of geographies. If certain minimum patient numbers or training rates are not achieved, DaVita can lose all or part of its preferred geographic rights. Under the agreement, DaVita commits to purchase all of its existing System One equipment currently being rented from us (for a purchase price of approximately $5.0 million) and to buy a significant percentage of its future System One equipment needs.
 
The agreement has an initial term of three years, terminating on December 31, 2009, and DaVita has the option of renewing the agreement for four additional periods of six months if DaVita meets certain patient volume targets.
 
In connection with the National Service Provider Agreement, on February 7, 2007, DaVita purchased 2,000,000 shares of our common stock for a purchase price of $10.00 per share.
 
Entrada.  During the six months ended June 30, 2007, we entered into a long-term agreement with the Entrada Group, or Entrada, to establish manufacturing and service operations in Mexico, initially for our cycler and PureFlow SL disposables and later for our PureFlow SL hardware. The agreement obligates Entrada


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to provide us with manufacturing space, support services and a labor force through 2012. The agreement may be terminated upon material breach, generally following a 30-day cure period.
 
Product Reliability Issue.  In the second quarter of 2007, we started to experience an increased incidence of reported dialysate leaks associated with our System One cartridges. The reported incidence of leaks is higher than we have historically observed. When the System One is used in accordance with its instructions, these leaks present no risk to patient health. System One device labeling anticipates the potential for leaks to occur and specifically warns against leaks and alerts users of the need to observe treatments in order to detect leaks. Four patients with reported leaks, that were unobserved by these patients or their partners until after their treatments were terminated, reported hypotension, or low blood pressure, resolved by a fluid bolus, with no lasting clinical effect. In early August 2007, we sent a letter to our patients and customers informing them of the increased incidence in leaks and reminding them of existing System One labeling alerting users of the potential for leaks and instructing them to observe treatments in order to detect any leaks. We have characterized this notification as a voluntary recall. On August 24, 2007, we elected to initiate a second step in our recall actions, and decided to physically recall the affected lots of cartridge inventory being held by chronic market customers and patients, and replace the affected inventory with newer lots of cartridges at no charge. We have instructed patients and customers to destroy all inventory of affected cartridges they have on hand, and we expect to write-off up to all of the inventory of affected cartridges we have in-house. It is possible that we may be able to rework this cartridge inventory, or reuse certain components of this inventory, but we have not made a final determination related to this recovery.
 
Based on these facts, we determined on August 24, 2007 that we would incur total charges in connection with this recall in the range of $1.9 million to $2.5 million, the principal component of which relates to the write-off of inventory in the range of $1.8 million to $2.2 million. Other charges primarily relate to increased shipping for replacement product and cycler servicing costs. Substantially all of these charges would be recorded in the quarter ending September 30, 2007.
 
The increased incidence in leaks has also been associated with increased cycler service requirements, which have led to increased service costs as well as imposed additional service pool requirements on our cycler inventory. In the short term, this may impede our ability to meet customer demand.
 
Resignation of Chief Operating Officer.   On August 28, 2007, Philip R. Licari, our Senior Vice President and Chief Operating Officer, announced his intention to resign from NxStage effective upon the completion of the Stock Purchase.
 
Overview
 
We are a medical device company that develops, manufactures and markets innovative systems for the treatment of ESRD and acute kidney failure. Our primary product, the System One, is a small, portable, easy-to-use hemodialysis system designed to provide physicians and patients improved flexibility in how hemodialysis therapy is prescribed and delivered. Given its design, the System One is particularly well-suited for home hemodialysis and more frequent, or “daily,” dialysis, which clinical literature suggests provides patients better clinical outcomes and improved quality of life. The System One is specifically cleared by the FDA for home hemodialysis as well as hospital and clinic-based dialysis. We believe the largest market opportunity for our product is the home hemodialysis market for the treatment of ESRD.
 
ESRD, which affects approximately 472,000 people in the United States, is an irreversible, life-threatening loss of kidney function that is treated predominantly with dialysis. Dialysis is a kidney replacement therapy that removes toxins and excess fluids from the bloodstream and, unless the patient receives a kidney transplant, is required for the remainder of the patient’s life. Over 70% of ESRD patients in the United States rely on life-sustaining dialysis treatment. Hemodialysis, the most widely prescribed type of dialysis, typically consists of treatments in a dialysis clinic three times per week, with each session lasting three to five hours. Approximately 8% of U.S. ESRD dialysis patients receive some form of dialysis treatment at home, most of whom treat themselves with peritoneal dialysis, or PD, although surveys of physicians and healthcare professionals suggest that a larger proportion of patients could take responsibility for their own care. We


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believe there is an unmet need for a hemodialysis system that allows more frequent and easily administered therapy at home and have designed our system to address this and other kidney replacement markets.
 
Measuring 15x15x18 inches, the System One is the smallest, commercially available hemodialysis system. It consists of a compact, portable and easy-to-use cycler, disposable drop-in cartridge and high purity premixed fluid. The System One has a self-contained design and simple user interface making it easy to operate by a trained patient and his or her trained partner in any setting prescribed by the patient’s physician. Unlike traditional dialysis systems, our System One does not require any special disinfection and its operation does not require specialized electrical or plumbing infrastructure or modifications to the home. Patients can bring the System One home, plug it in to a conventional electrical outlet and operate it, thereby eliminating what can be expensive plumbing and electrical household modifications required by other traditional dialysis systems. Given its compact size and lack of infrastructure requirements, the System One is portable, allowing patients freedom to travel. We believe these features provide patients and their physicians new treatment options for ESRD.
 
We market the System One to dialysis clinics for chronic hemodialysis treatment, providing clinics with improved access to a developing market, the home hemodialysis market, and the ability to expand their patient base by adding home-based patients without adding clinic infrastructure. The clinics in turn provide the System One to ESRD patients. For each month that a patient is treated with the System One, we bill the clinic for the purchase of the related disposable cartridges and treatment fluids necessary to perform treatment. Typically, our customers have rented the System One equipment on a month to month basis, although early in 2007, two of our dialysis chain customers have elected to purchase rather than rent System One equipment. Clinics receive reimbursement from Medicare, private insurance and patients for dialysis treatments. We commenced marketing the System One for chronic hemodialysis treatment in September 2004. As of June 30, 2007, 1,615 ESRD patients were using the System One at 200 different dialysis clinics. Substantially all of these patients are treated at home or are in training to treat themselves at home; the remaining patients are doing therapy in a clinic.
 
We are not responsible for, and do not provide, patient training. Training is provided by the patient’s dialysis clinic and takes place at the clinic primarily during the patient’s prescribed, often daily, two to three hour treatment sessions. Patient training, which typically takes two to three weeks, includes basic instruction on ESRD, operation of the System One and insertion by the patient or their partner of needles into the patient’s vascular access site. Clinics provide testing to patients and their partners at the conclusion of training to verify skills and an understanding of System One operation. Training sessions are reimbursed by Medicare, and there may be a co-payment requirement to the patient associated with this training.
 
Medicare reimburses the same amount per treatment for home and in-center hemodialysis treatments, up to three treatments per week. Payment for more than three treatments per week is available with appropriate medical justification. The adoption of our System One for more frequent therapy for ESRD could be slowed if Medicare is reluctant or refuses to pay for these additional treatments.
 
We also market the System One in the critical care market to hospitals for treatment of acute kidney failure and fluid overload. It is estimated that there are over 200,000 cases of acute kidney failure in the United States each year. The System One provides an effective, simple-to-operate alternative to dialysis systems currently used in the hospital to treat these acute conditions. We commenced marketing the System One to the critical care market in February 2003. As of June 30, 2007, 93 hospitals were using the System One to deliver acute kidney failure and fluid overload therapy.
 
We were incorporated in Delaware in 1998 under the name QB Medical, Inc., and later changed our name to NxStage Medical, Inc. Our principal executive offices are located at 439 South Union Street, Fifth Floor, Lawrence, Massachusetts 01843.


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Comment:  link1 "Our Products and Services"
 
Our Products and Services
 
The System One
 
Our primary product, the System One, is a small, portable, easy-to-use hemodialysis system, which incorporates multiple design technologies and design features.
 
The System One includes the following components:
 
  •  The NxStage Cycler.  A compact portable electromechanical device containing pumps, control mechanisms, safety sensors and remote data capture functionality.
 
  •  The NxStage Cartridge.  A single-use, disposable, integrated treatment cartridge that loads simply and easily into the cycler. The cartridge incorporates a proprietary volumetric fluid management system and includes a pre-attached dialyzer.
 
  •  Premixed Dialysate.  The System One uses high-purity premixed dialysate for hemodialysis applications. The volume of fluids used varies with treatment options and prescription, but typical weekly volumes are similar to the amount of dialysate used by a patient on PD. We supply our premixed dialysate in sterile five liter bags or through the use of our PureFlow SL module, which received FDA clearance in March 2006 and was made available to our customers beginning in July 2006. The PureFlow SL module allows for the preparation of dialysate fluid in the patient’s home using ordinary tap water and dialysate concentrate thereby eliminating the need for bagged fluids.
 
For the ESRD market, the System One is designed to make home treatment and more frequent treatment easier and more practical. Although most are not performed using our product, clinical studies suggest that therapy administered five to six times per week, commonly referred to as daily therapy, better mimics the natural functioning of the human kidney and can lead to improved clinical outcomes, including reduction in hypertension, improved anemia status, reduced reliance on pharmaceuticals, improved nutritional status, reduced hospitalizations and overall improvement in quality of life. Other published literature also supports the clinical and quality of life benefits associated with home dialysis therapy.
 
For the critical care market, our System One is designed to offer clinicians an alternative that simplifies the delivery of acute kidney replacement therapy and makes longer or continuous critical care therapies easier to deliver. The ability of our system to perform hemofiltration and/or isolated ultrafiltration, for which the System One is also FDA cleared, is advantageous, as many clinicians choose to prescribe this therapy for patients with acute kidney failure.
 
Competition
 
Chronic Care
 
The dialysis therapy market is mature, consolidated and competitive. We compete with suppliers of hemodialysis and peritoneal dialysis devices and certain dialysis device manufacturers that also provide dialysis services. We currently face direct competition in the United States primarily from Fresenius Medical Care AG, or Fresenius, Baxter Healthcare, or Baxter, Gambro AB or Gambro, B. Braun or B. Braun, and others. Fresenius, Baxter and Gambro each have large and well-established dialysis products businesses.
 
We believe the competition in the market for kidney dialysis equipment and supplies is based primarily on:
 
  •  product quality;
 
  •  ease-of-use;
 
  •  cost effectiveness;
 
  •  sales force coverage; and
 
  •  clinical flexibility.


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We believe that we compete favorably in terms of product quality and ease of use due to our System One design, portability, drop-in cartridge and use of premixed fluids. We believe we also compete favorably on the basis of clinical flexibility, given the System One’s ability to work well in acute and chronic settings and to perform hemofiltration, hemodialysis and ultrafiltration. We believe we compete favorably in terms of cost-effectiveness to clinics. Although our product is priced at a premium compared to some competitive products in the market, we allow clinics to reduce labor costs by offering their patients a home treatment alternative. We compete unfavorably in terms of sales force coverage and branding because we have only recently commenced commercial sales of our System One in the chronic care market and have a smaller sales force than most of our competitors.
 
Our primary competitors are large, well-established businesses with significantly more financial and personnel resources than us. They also have significantly greater commercial infrastructures than we have. We believe our ability to compete successfully will depend largely on our ability to:
 
  •  establish the infrastructures necessary to support a growing home and critical care dialysis products business;
 
  •  maintain and improve product quality;
 
  •  continue to develop sales and marketing capabilities;
 
  •  achieve cost reductions; and
 
  •  access the capital needed to support the business.
 
Our ability to successfully market the System One, and any products we may develop in the future, for the treatment of kidney failure could also be adversely affected by pharmacological and technological advances in preventing the progression of chronic ESRD and/or in the treatment of acute kidney failure, technological developments by others in the area of dialysis, the development of new medications designed to reduce the incidence of kidney transplant rejection and progress in using kidneys harvested from genetically-engineered animals as a source of transplants. There can be no assurance that competitive pressure or pharmacological or technological advancements will not have a material adverse effect on our business.
 
Critical Care
 
We believe that competition in the critical care market will be affected by system functionality, ease-of-use, reliability, portability and infrastructure requirements. In the fluid overload market, we believe competition will be further affected by physicians’ willingness to adopt ultrafiltration as a viable treatment alternative to pharmaceutical therapy. In the critical care market, we face direct competition from Gambro, Baxter, B. Braun and Fresenius.
 
In the fluid overload market, drug therapy is currently the most common and preferred treatment. To date, ultrafiltration has not been broadly adopted and, if the medical community does not accept ultrafiltration as clinically useful, cost-effective and safe, we will not be able to successfully compete against existing pharmaceutical therapies. Our ability to successfully market the System One for the treatment of fluid overload associated with multiple diseases, including congestive heart failure, or CHF, could also be adversely affected by pharmacological and technological advances in preventing or treating fluid overload.
Comment:  link1 "Sales and Marketing"
 
Sales and Marketing
 
We sell our products in two markets: the chronic care market and the critical care market. We have separate marketing and sales efforts dedicated to each market. In 2006, sales to DaVita, Inc. represented 19.4% of our total revenues, and DaVita is expected to remain a significant customer of ours in 2007. No other single customer represented 10% or more of our revenues in 2006. In 2005, sales to Clarian Health Partners represented 10.0% of our total revenues, sales to Renal Care Group represented 12.4% of our total revenues and sales to Wellbound, Inc. represented 10.5% of our total revenues. No other single customer represented 10% or more of our revenues in 2005.


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Chronic Care
 
In the chronic care market, our customers are independent dialysis clinics as well as dialysis clinics that are part of national chains. Since Medicare regulations require that all chronic ESRD patients be under the care of a dialysis clinic, whether they are treated at-home, in-clinic or with a kidney transplant, we do not, and cannot, sell the System One directly to chronic care patients.
 
We have a chronic care direct sales force that calls on dialysis clinics. In addition to specialized sales representatives, we also employ nurses on our chronic care sales force to serve as clinical educators to support our sales efforts.
 
Currently, there are approximately 4,500 Medicare-certified dialysis outpatient facilities in the United States. Ownership of these clinics is highly consolidated with DaVita controlling approximately 27% and Fresenius controlling approximately 33% after giving effect to Fresenius’ acquisition of Renal Care Group. Smaller chains and independent clinics and hospitals represent the approximately 40% of remaining clinics. Our customers include independent clinics as well as large and smaller chains.
 
In February 2007, we entered into an agreement with DaVita that grants DaVita certain market rights for the System One and related supplies for home hemodialysis therapy. Under this agreement, we granted DaVita exclusive rights in a small percentage of geographies, which geographies collectively represent less than 10% of the U.S. ESRD patient population, and limited exclusivity in the majority of all other U.S. geographies, subject to DaVita’s meeting certain requirements, including patient volume commitments and new patient training rates. We will continue to sell to other clinics in the majority of geographies. The agreement limits, but does not prohibit, the sale by NxStage of the System One for chronic home hemodialysis therapy to any provider that is under common control or management of a parent entity that collectively provides dialysis services to more than 25% of U.S. chronic dialysis patients and that also supplies dialysis products. NxStage is, therefore, limited to some extent in its ability to sell the System One for chronic home hemodialysis therapy to Fresenius.
 
After renting or selling a System One to a clinic, our sales representatives and clinical educators train the clinic’s nurses and dialysis technicians on the proper use of the system using proprietary training materials. We then rely on the trained technicians and nurses to train home patients and other technicians and nurses using the System One, rather than sending our sales representatives and nurses back to the clinic to train each new patient, nurse or technician. This approach also allows the clinic and physician to select, train and support the dialysis patients that will use our system, much the same way as they manage their patients who are on PD therapy.
 
We began marketing the System One to perform hemodialysis for ESRD patients in September 2004. As of June 30, 2007, there were 1,615 patients with chronic ESRD using the System One.
 
Critical Care
 
In the critical care market, because both acute kidney failure and fluid overload are typically treated in hospital intensive care units, our customers are hospitals. We are specifically focusing our sales efforts in the critical care market on those large institutions that we believe are most dedicated to increased and improved dialysis therapy for patients with acute kidney failure and believe in ultrafiltration as an earlier-stage treatment option for fluid overload associated with multiple diseases, including CHF.
 
We have a critical care direct sales force that calls on hospitals. In addition to specialized sales representatives, we also employ nurses in our critical care sales force to serve as clinical educators to support our sales efforts.
 
The System One for the critical care market has a list price of $28,000; this price does not include the related disposables required for each treatment. After selling or placing a System One in a hospital, our sales representatives and clinical educators train the hospital’s intensive care unit, or ICU, and acute dialysis nurses on the proper use of the system using proprietary training materials. We then rely on the trained nurses to


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train other nurses. By adopting this “train the trainer” approach, our sales representatives and nurses do not need to return to the hospital each time a new nurse needs to be trained.
 
We began promoting our System One product for use in the critical care market in February 2003. As of June 30, 2007, we had 93 hospitals as critical care customers.
 
Customer Support Services
 
We primarily use a depot service model for equipment servicing and repair for the chronic care market. If a device malfunctions and requires repair, we arrange for a replacement device to be shipped to the site of care, whether it is a patient’s home, clinic or hospital, and for pick up and return to us of the system requiring service. This shipment is done by common carrier, and, as there are no special installation requirements, the patient, clinic or hospital can quickly and easily set up the new machine. In addition, we ship monthly supplies via common carrier and courier services directly to chronic care patients, dialysis clinics and hospitals.
 
In addition to depot service, the critical care market also demands field service calls for cycler servicing and repair. The nature of the hospital environment, coupled with the practices of other ICU dialysis equipment suppliers, frequently necessitates on-site clinical support for our systems installed in this environment.
 
We maintain telephone service coverage 24-hours a day, seven days a week, to respond to technical questions raised by patients, clinics and hospitals concerning our System One product.
Comment:  link1 "Research and Development"
 
Research and Development
 
Our research and development organization has focused on developing innovative technical approaches that address the limitations of current dialysis systems. Our development team has skills across the range of technologies required to develop and maintain dialysis systems. These areas include filters, tubing sets, mechanical systems, fluids, software and electronics. In response to physician and patient feedback and our own assessments, we are continually working on enhancements to our product designs to improve ease-of-use, functionality, reliability and safety. We also seek to develop new products that supplement positively our existing product offerings and intend to continue to actively pursue opportunities for the research and development of complementary products.
 
For the years ended December 31, 2006, 2005 and 2004, we incurred research and development expenses of $6.4 million, $6.3 million and $6.0 million, respectively.
 
Intellectual Property
 
We seek to protect our investment in the research, development, manufacturing and marketing of our products through the use of patent, trademark, copyright and trade secret law. We own or have rights to a number of patents, trademark, copyrights, trade secrets and other intellectual property directly related and important to our business.


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As of December 31, 2006, we had 25 issued U.S. and international patents and 49 U.S., international and foreign pending patent applications.
 
                             
Patent No.
    Regime   Filed     Expiration Date    
Description
 
  6,254,567     U.S.     2/23/2000       2/26/2019     Addresses fluids requirement by regenerating dialysate
  6,554,789     U.S.     2/25/2000       2/14/2017     Panels defined by seals and overlying panels
  6,572,576     U.S.     7/7/2001       7/2/2021     Leak detection by flow reversal
  6,572,641     U.S.     4/9/2001       4/9/2021     Fluid warmer that removes air
  6,579,253     U.S.     2/25/2000       2/14/2017     Balancing chambers are defined by panels of the circuit
  6,582,385     U.S.     2/19/1998       2/19/2018     Addresses fluids requirement by purifying waste
  6,589,482     U.S.     2/25/2000       2/14/2017     Panels form a combination to mutually displace waste and replacement fluid
  6,595,943     U.S.     2/25/2000       2/14/2017     Blood pressure control in filter to optimize throughput
  6,638,477     U.S.     2/25/2000       2/14/2017     Divert part of waste stream to control ultrafiltration or rinse
  6,638,478     U.S.     2/25/2000       2/14/2017     Mechanically coupled flow assemblies that balance flow of incoming and outgoing fluid streams, respectively
  6,649,063     U.S.     7/12/2001       10/7/2021     Using the filter to generate sterile replacement fluid
  6,673,314     U.S.     2/25/2000       2/14/2017     Supply notification including third-party notification by network
  6,702,561     U.S.     7/12/2001       9/8/2021     Potting distribution channel molded into filter housing
  6,743,193     U.S.     7/17/2001       7/17/2021     Hermetic valve design
  6,830,553     U.S.     2/25/2000       2/14/2017     Sterile filter in replacement fluid line
  6,852,090     U.S.     5/24/2001       12/10/2017     Balancing chambers are defined by circuit portions defined in cooperation with the base
  6,872,346     U.S.     3/20/2003       5/14/2023     Manufacturing method for filters using radiant heat to seal filter fibers
  6,955,655     U.S.     6/27/2001       10/7/2017     Frequent treatment with simple setup
  6,979,309     U.S.     1/7/2002       6/19/2017     New frequent hemofiltration
  7,004,924     U.S.     10/19/1998       2/11/2018     Methods, systems, and kits for the extracorporeal processing of blood
  7,040,142     U.S.     1/4/2002       2/9/2022     Method and apparatus for leak detection in blood circuits combining external fluid detection and air infiltration detection
  7,087,033     U.S.     7/8/2002       8/22/2021     Method and apparatus for leak detection in a fluid line
  7,112,273     U.S.     9/26/2003       10/4/2023     Volumetric fluid balance control for extracorporeal blood treatment
  7,147,613     U.S.     3/8/2004       8/29/2020     Measurement of fluid pressure in a blood treatment device
  EP969887     EP (UK)     2/5/1998       2/14/2017     Frequent treatment with simple setup
 
Patents for individual products extend for varying periods of time according to the date a patent application is filed or a patent is granted and the term of the patent protection available in the jurisdiction granting the patent. The scope of protection provided by a patent can vary significantly from country to country.


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In addition to our patents and pending patent applications in the United States and selected non-U.S. markets, we possess trade secrets and proprietary know-how relating to our products. Any of our trade secrets, know-how or other technology not protected by a patent could be misappropriated, or independently developed by, a competitor and could, if independently invented and patented by a competitor, under some circumstances, be used to prevent us from further use of such secrets.
 
Our strategy is to develop patent portfolios for our research and development projects. We monitor the activities of our competitors and other third parties with respect to their use of intellectual property. We intend to aggressively defend the patents we hold, and we intend to vigorously contest claims other patent holders may bring against us.
 
The medical device industry is characterized by the existence of a large number of patents and frequent litigation based on allegations of patent infringement. While we attempt to ensure that our products and methods do not infringe other parties’ patents and proprietary rights, our competitors may assert that our products, or the methods that we employ, are covered by patents held by them. In addition, our competitors may assert that future products and methods we may market infringe their patents.
 
We require our employees, consultants and advisors to execute confidentiality agreements in connection with their employment, consulting or advisory relationship with us. We also require our employees to agree to disclose and assign to us all inventions conceived by them during their employment with us. Similar obligations are imposed upon consultants and advisors performing work for us relating to the design or manufacture of our products. Despite efforts taken to protect our intellectual property, unauthorized parties may attempt to copy aspects of our products or to obtain and use information that we regard as proprietary.
 
Manufacturing
 
The manufacture of our products is accomplished through a complementary combination of outsourcing and internal production. Specifically, we assemble, package and label our PureFlow SL disposables within our 45,000 square foot facility in Lawrence, Massachusetts and 24,000 square foot facility in North Andover, Massachusetts. We recently commenced manufacture of PureFlow SL disposables in Fresnillo, Mexico. We also manufacture our dialyzers internally, within our 5,000 square foot facility in Rosdorf, Germany. We outsource the manufacture of our disposable cartridges, premixed dialysate and the System One cycler, although we have just initiated internal manufacture of the cycler as well in Fresnillo, Mexico.
 
We have single-source suppliers of components, but in most instances there are alternative sources of supply available. Where obtaining a second source is more difficult, we have tried to establish supply agreements that better protect our continuity of supply. These agreements, currently in place with several key suppliers, are intended to establish commitments to supply product. We do not have supply agreements in place with all of our single-source suppliers.
 
We have certain agreements that grant certain suppliers exclusive or semi-exclusive supply rights. In January 2007, we entered into a long-term supply agreement with Membrana GmbH pursuant to which Membrana has agreed to supply, on an exclusive basis, capillary membranes for use in the filters used with the System One for ten years. In exchange for Membrana’s agreement to pricing reductions based on volumes ordered, we have agreed to purchase a base amount of membranes per year. The agreement may be terminated upon a material breach, generally following a 60-day cure period.
 
In January 2007 we also entered into a seven-year agreement with MDS pursuant to which MDS will supply to us no less than 90% of our North American requirements for disposable cartridges for use with the System One. The agreement may be terminated upon a material breach, generally following a 120-day cure period. MDS is a related party to NxStage. David Utterberg, the president and sole stockholder of MDS, is a director and significant stockholder of NxStage. In accordance with our Audit Committee Charter, the MDS supply agreement was approved by our audit committee as well as our board of directors.
 
KMC Systems, Inc. manufactures the System One cycler for us pursuant to an agreement that obligates KMC to continue to provide product to us at least through mid-2008. This agreement also allows us the option


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to manufacture for ourself an increasing portion of cyclers as we deem appropriate over the remaining term. The contract may be terminated upon a material breach, generally following a 30-day cure period.
 
We purchase bicarbonate-based premixed dialysate from B. Braun and our lactate-based premixed dialysate from Laboratorios PISA. We have a long-term supply agreement with B. Braun that obligates B. Braun to supply the dialysate to us through 2009 in exchange for modest minimum purchase requirements of approximately $100,000 per year. The contract may be terminated upon a material breach, generally following a 30-day cure period. We have entered into a supply agreement with PISA that obligates PISA to supply dialysate to us through 2008 in exchange for annual purchase commitments of approximately $1.0 million. The contract may be terminated upon a material breach, generally following a 30-day cure period.
 
We are currently purchasing our PureFlow SL module and chassis from Enercon. We are operating under a short-term supply agreement with Enercon that obligates Enercon to supply this equipment to us through July 2007. There are no minimums or exclusivity clauses associated with this agreement, and the agreement renews on a year-to-year basis, unless prior written notice is given by either party. The contract may be terminated upon a material breach, generally following a 30-day cure period.
Comment:  link1 "Government Regulation"
 
Government Regulation
 
Food and Drug Administration
 
In the United States, our products are subject to regulation by the FDA, which regulates our products as medical devices. The FDA regulates the clinical testing, manufacture, labeling, distribution, import and export, sale and promotion of medical devices. Noncompliance with applicable FDA requirements can result in, among other things, fines, injunctions, civil penalties, recall or seizure of products, total or partial suspension of production, failure of the government to grant pre-market clearance or pre-market approval for devices, withdrawal of marketing clearances or approvals and criminal prosecution.
 
Unless an exemption applies, all medical devices must receive either prior 510(k) clearance or pre-market approval from the FDA before they may be commercially distributed in the United States. Submissions to obtain 510(k) clearance and pre-market approval must be accompanied by a user fee, unless exempt. In addition, the FDA can also impose restrictions on the sale, distribution or use of devices at the time of their clearance or approval, or subsequent to marketing.
 
The FDA classifies medical devices into one of three classes: Class I, Class II or Class III — depending on the FDA’s assessment of the degree of risk associated with the device and the controls it deems necessary to reasonably ensure the device’s safety and effectiveness. The FDA has deemed our System One to be a Class II medical device and we have marketed it as such in the United States.
 
Class I devices are those for which safety and effectiveness can be assured by adherence to a set of general controls, which include compliance with facility registration and product listing requirements, reporting of adverse events, and appropriate, truthful and non-misleading labeling, advertising and promotional materials. Class II devices are also subject to these same general controls, as well as any other special controls deemed necessary by the FDA to ensure the safety and effectiveness of the device. These special controls can include performance standards, post-market surveillance, patient registries and FDA guidelines. Pre-market review and clearance by the FDA for Class II devices is accomplished through the 510(k) pre-market notification procedure, unless the device is exempt. When 510(k) clearance is required, a manufacturer must submit a pre-market notification to the FDA demonstrating that the proposed device is substantially equivalent in intended use and in safety and effectiveness to a legally marketed device that is not subject to pre-market approval, i.e., a device that was legally marketed prior to May 28, 1976 and for which the FDA has not yet required pre-market approval; a device which has been reclassified from Class III to Class II or I; or a novel device classified into Class I or II through de novo classification. If the FDA agrees that the device is substantially equivalent to the predicate, it will subject the device to the same classification and degree of regulation as the predicate device, thus effectively granting clearance to market it. After a device receives 510(k) clearance, any modification that could significantly affect its safety or effectiveness, or that would constitute a major change in its intended use, requires a new 510(k) clearance or possibly a pre-market approval. Class III devices are


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devices for which insufficient information exists that general or special controls will provide reasonable assurance of safety and effectiveness, and the devices are life-sustaining, life-supporting, or implantable, or of substantial importance in preventing the impairment of human health, or present a potential, unreasonable risk of illness or injury. Class III devices requiring an approved pre-market approval application to be marketed are devices that were regulated as new drugs prior to May 28, 1976, devices not found substantially equivalent to devices marketed prior to May 28, 1976 and Class III pre-amendment devices, which are devices introduced in the U.S. market prior to May 28, 1976, that by regulation require pre-market approval.
 
FDA Regulatory Clearance Status
 
We currently have all of the regulatory clearances required to market the System One in the United States in both the chronic and critical care markets. The FDA has cleared the System One for the treatment, under a physician’s prescription, of renal failure or fluid overload using hemofiltration, hemodialysis and/or ultrafiltration. The FDA has also specifically cleared the System One for home hemodialysis use under a physician’s prescription.
 
We received our first clearance from the FDA for a predecessor model to the System One in January 2001 for hemofiltration and ultrafiltration. In July 2003, we received expanded clearance from the FDA for the System One for hemodialysis, hemofiltration and ultrafiltration. Most recently, in June 2005, we received FDA clearance specifically allowing us to promote home hemodialysis using the System One. We have received a total of 20 product clearances from the FDA since our inception in December 1998. We continue to seek opportunities for product improvements and feature enhancements, which will, from time to time, require FDA clearance before market launch.
 
FDA Clearance Procedures
 
510(k) Clearance Pathway.  When we are required to obtain a 510(k) clearance for a device, which we wish to market, we must submit a pre-market notification to the FDA demonstrating that the device is substantially equivalent to a device that was legally marketed prior to May 28, 1976 and for which the FDA has not yet required pre-market approval; a device which has been reclassified from Class III to Class II or I; or a novel device classified into Class I or II through de novo classification. The FDA attempts to respond to a 510(k) pre-market notification within 90 days of submission of the notification (or in some instances 30 days under what is referred to as “special” 510(k) submission), but the response may be a request for additional information or data, sometimes including clinical data. As a practical matter, pre-market clearance can take significantly longer, including up to one year or more.
 
After a device receives 510(k) clearance for a specific intended use, any modification that could significantly affect its safety or effectiveness, or that constitutes a major change in its intended use, would require a new 510(k) clearance or could require pre-market approval. In the first instance, the manufacturer may determine that a change does not require a new 510(k) clearance. The FDA can review any such decision and can disagree with a manufacturer’s determination. If the FDA disagrees with a manufacturer’s determination that a new clearance or approval is not required for a particular modification, the FDA can require the manufacturer to cease marketing and/or recall the modified device until 510(k) clearance or pre-market approval is obtained.
 
Pre-market Approval Pathway.  A pre-market approval application must be submitted if the device cannot be cleared through the 510(k) process. The pre-market approval process is much more demanding than the 510(k) pre-market notification process. A pre-market approval application must be supported by extensive data and information including, but not limited to, technical, preclinical, clinical trials, manufacturing and labeling to demonstrate to the FDA’s satisfaction the safety and effectiveness of the device.
 
After the FDA determines that a pre-market approval application is complete, the FDA accepts the application and begins an in-depth review of the submitted information. The FDA, by statute and regulation, has 180 days to review an accepted pre-market approval application, although the review generally occurs over a significantly longer period of time, and can take up to several years. During this review period, the FDA may request additional information or clarification of information already provided. Also during the review


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period, an advisory panel of experts from outside the FDA may be convened to review and evaluate the application and provide recommendations to the FDA as to the approvability of the device. In addition, the FDA will conduct a pre-approval inspection of the manufacturing facility to ensure compliance with the Quality System Regulations. New pre-market approval applications or supplemental pre-market approval applications are required for significant modifications to the manufacturing process, labeling, use and design of a device that is approved through the pre-market approval process. Pre-market approval supplements often require submission of the same type of information as a pre-market approval application, except that the supplement is limited to information needed to support any changes from the device covered by the original pre-market approval application, and may not require as extensive clinical data or the convening of an advisory panel.
 
Clinical Trials.  A clinical trial is almost always required to support a pre-market approval application and is sometimes required for a 510(k) pre-market notification. Clinical trials for devices that involve significant risk, referred to as significant risk devices, require submission of an application for an investigational device exemption, or IDE, to the FDA. The IDE application must be supported by appropriate data, such as animal and laboratory testing results, showing that it is safe to test the device in humans and that the testing protocol is scientifically sound. Clinical trials for a significant risk device may begin once the IDE application is approved by the FDA and the institutional review board, or IRB, overseeing the clinical trial. If FDA fails to respond to an IDE application within 30 days of receipt, the application is deemed approved, but IRB approval would still be required before a study could begin. Products that are not significant risk devices are deemed to be “non-significant risk devices” under FDA regulations, and are subject to abbreviated IDE requirements, including informed consent, IRB approval of the proposed clinical trial, and submitting certain reports to the IRB. Clinical trials are subject to extensive recordkeeping and reporting requirements. Our clinical trials must be conducted under the oversight of an IRB at each clinical study site and in accordance with applicable regulations and policies including, but not limited to, the FDA’s good clinical practice, or GCP, requirements.
 
Continuing FDA Regulation
 
After a device is placed on the market, numerous regulatory requirements apply. These include, among others:
 
  •  Quality System Regulations, which require manufacturers to have a quality system for the design, manufacture, packaging, labeling, storage, installation, and servicing of finished medical devices;
 
  •  labeling regulations, which govern product labels and labeling, prohibit the promotion of products for unapproved, or off-label, uses and impose other restrictions on labeling and promotional activities;
 
  •  medical device reporting, or MDR, regulations, which require that manufacturers report to the FDA if their device may have caused or contributed to a death or serious injury or malfunctioned in a way that would likely cause or contribute to a death or serious injury if it were to recur; and
 
  •  recalls and notices of correction or removal.
 
MDR Regulations.  The MDR regulations require that we report to the FDA any incident in which our product may have caused or contributed to a death or serious injury, or in which our product malfunctioned and, if the malfunction were to recur, would likely cause or contribute to a death or serious injury. At December 31, 2006, we had submitted 266 MDRs. Most of these have been submitted to comply with FDA’s blood loss policy for routine dialysis treatments. This policy requires manufacturers to file MDR reports related to routine dialysis treatments if the patient experiences blood loss greater than 20cc.
 
FDA Inspections.  We have registered with the FDA as a medical device manufacturer. The FDA seeks to ensure compliance with regulatory requirements through periodic, unannounced facility inspections by the FDA, and these inspections may include the manufacturing facilities of our subcontractors. Failure to comply


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with applicable regulatory requirements can result in enforcement action by the FDA, which may include any of the following:
 
  •  warning letters or untitled letters;
 
  •  fines, injunctions, and civil penalties;
 
  •  administrative detention;
 
  •  voluntary or mandatory recall or seizure of our products;
 
  •  customer notification, or orders for repair, replacement or refund;
 
  •  operating restrictions, partial suspension or total shutdown of production;
 
  •  refusal to review pre-market notification or pre-market approval submissions;
 
  •  rescission of a substantial equivalence order or suspension or withdrawal of a pre-market approval; and
 
  •  criminal prosecution.
 
The FDA has inspected our facility and quality systems three times. In our first inspection, one observation was made, but was rectified during the inspection, requiring no further response from us. Our last two inspections, including our most recent inspection in March 2006, resulted in no observations. We cannot provide assurance that we can maintain a comparable level of regulatory compliance in the future at our facilities.
Comment:  link1 "Foreign Regulation of Medical Devices"
 
Foreign Regulation of Medical Devices
 
Clearance or approval of our products by regulatory authorities comparable to the FDA may be necessary in foreign countries prior to the commencement of marketing of the product in those countries, whether or not FDA clearance has been obtained. The regulatory requirements for medical devices vary significantly from country to country. They can involve requirements for additional testing and may be time consuming and expensive. We have not sought approval for our products outside of the United States, Canada and the European Union. We cannot provide assurance that we will be able to obtain regulatory approvals in any other markets.
 
The System One cycler and related cartridges are regulated as medical devices in Canada under the Canadian Medical Device Regulations and in the European Union, or EU, under the Medical Device Directive. We have received four product licenses from Canada, although these licenses are not up to date to reflect the product that is currently being marketed in the United States. Although we have obtained CE marking approval in the EU for our System One, this CE marking is not up to date. Before we would be able to market our current products in the EU, we would be required to submit additional regulatory documentation. We are not currently marketing any products in Canada or in the EU.
Comment:  link1 "Fraud and Abuse Laws"
 
Fraud and Abuse Laws
 
Anti-Kickback Statutes
 
The federal healthcare program Anti-Kickback Statute prohibits persons from knowingly and willfully soliciting, offering, receiving or providing remuneration, directly or indirectly, in exchange for or to induce either the referral of an individual for, or the furnishing, arranging for or recommending a good or service for which payment may be made in whole or part under a federal healthcare program such as Medicare or Medicaid. The definition of remuneration has been broadly interpreted to include anything of value, including for example gifts, discounts, the furnishing of supplies or equipment, credit arrangements, payments of cash and waivers of payments. Several courts have interpreted the statute’s intent requirement to mean that if any one purpose of an arrangement involving remuneration is to induce referrals or otherwise generate business involving goods or services reimbursed in whole or in part under federal healthcare programs, the statute has been violated. The law contains a few statutory exceptions, including payments to bona fide employees, certain discounts and certain payments to group purchasing organizations. Violations can result in significant penalties, imprisonment and exclusion from Medicare, Medicaid and other federal healthcare programs. Exclusion of a manufacturer would


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preclude any federal healthcare program from paying for its products. In addition, kickback arrangements can provide the basis for an action under the Federal False Claims Act, which is discussed in more detail below.
 
The Anti-Kickback Statute is broad and potentially prohibits many arrangements and practices that are lawful in businesses outside of the healthcare industry. Recognizing that the Anti-Kickback Statute is broad and may technically prohibit many innocuous or beneficial arrangements, the Office of Inspector General of Health and Human Services, or OIG, issued a series of regulations, known as the safe harbors, beginning in July 1991. These safe harbors set forth provisions that, if all the applicable requirements are met, will assure healthcare providers and other parties that they will not be prosecuted under the Anti-Kickback Statute. The failure of a transaction or arrangement to fit precisely within one or more safe harbors does not necessarily mean that it is illegal or that prosecution will be pursued. However, conduct and business arrangements that do not fully satisfy each applicable safe harbor may result in increased scrutiny by government enforcement authorities such as the OIG. Arrangements that implicate the Anti-Kickback Law, and that do not fall within a safe harbor, are analyzed by the OIG on a case-by-case basis.
 
Government officials have focused recent enforcement efforts on, among other things, the sales and marketing activities of healthcare companies, and recently have brought cases against individuals or entities with personnel who allegedly offered unlawful inducements to potential or existing customers in an attempt to procure their business. Settlements of these cases by healthcare companies have involved significant fines and/or penalties and in some instances criminal pleas.
 
In addition to the Federal Anti-Kickback Law, many states have their own kickback laws. Often, these laws closely follow the language of the federal law, although they do not always have the same exceptions or safe harbors. In some states, these anti-kickback laws apply with respect to all payors, including commercial health insurance companies.
 
False Claims Laws
 
Federal false claims laws prohibit any person from knowingly presenting, or causing to be presented, a false claim for payment to the federal government or knowingly making, or causing to be made, a false statement to get a false claim paid. Manufacturers can be held liable under false claims laws, even if they do not submit claims to the government, if they are found to have caused submission of false claims. The Federal Civil False Claims Act also includes whistle blower provisions that allow private citizens to bring suit against an entity or individual on behalf of the United States and to recover a portion of any monetary recovery. Many of the recent highly publicized settlements in the healthcare industry related to sales and marketing practices have been cases brought under the False Claims Act. The majority of states also have statutes or regulations similar to the federal false claims laws, which apply to items and services reimbursed under Medicaid and other state programs, or, in several states, apply regardless of the payor. Sanctions under these federal and state laws may include civil monetary penalties, exclusion of a manufacturer’s products from reimbursement under government programs, criminal fines, and imprisonment.
 
Privacy and Security
 
The Health Insurance Portability and Accountability Act of 1996, or HIPAA, and the rules promulgated thereunder require certain entities, referred to as covered entities, to comply with established standards, including standards regarding the privacy and security of protected health information, or PHI. HIPAA further requires that covered entities enter into agreements meeting certain regulatory requirements with their business associates, as such term is defined by HIPAA, which, among other things, obligate the business associates to safeguard the covered entity’s PHI against improper use and disclosure. While not directly regulated by HIPAA, a business associate may face significant contractual liability pursuant to such an agreement if the business associates breaches the agreement or causes the covered entity to fail to comply with HIPAA. In the course of our business operations, we have entered into several business associate agreements with certain of our customers that are also covered entities. Pursuant to the terms of these business associate agreements, we have agreed, among other things, not to use or further disclose the covered entity’s PHI except as permitted or required by the agreements or as required by law, to use reasonable safeguards to prevent prohibited disclosure of such PHI and to report to the covered entity


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any unauthorized uses or disclosures of such PHI. Accordingly, we incur compliance related costs in meeting HIPAA-related obligations under business associate agreements to which we are a party. Moreover, if we fail to meet our contractual obligations under such agreements, we may incur significant liability.
 
In addition, HIPAA’s criminal provisions could potentially be applied to a non-covered entity that aided and abetted the violation of, or conspired to violate HIPAA, although we are unable at this time to determine conclusively whether our actions could be subject to prosecution in the event of an impermissible disclosure of health information to us. Also, many state laws regulate the use and disclosure of health information, and are not necessarily preempted by HIPAA, in particular those laws that afford greater protection to the individual than does HIPAA. Finally, in the event we change our business model and become a HIPAA covered entity, we would be directly subject to HIPAA, its rules and its civil and criminal penalties.
 
Reimbursement
 
Chronic Care
 
Medicare regulations require that all chronic ESRD patients be under the care of a dialysis clinic, whether they are treated at home or in-clinic. We rent or sell our System One to dialysis clinics; these clinics are, in turn, reimbursed by Medicare, Medicaid and private insurers. According to the 2005 USRDS report, Medicare is the primary payor for approximately 81% of patients using hemodialysis and PD. It is believed that 15% of patients are covered by commercial insurance, with the remaining 4% of patients classified by the USRDS as “other” or “unknown”. Certain centers have reported that the NxStage daily home dialysis therapy attracts a higher percentage of commercial insurance patients than other forms of dialysis.
 
Medicare.  Medicare generally provides health insurance coverage for persons who are age 65 or older and for persons who are completely disabled. For ESRD patients, however, Medicare coverage is not dependent on age or disability. For patients eligible for Medicare based solely on ESRD, generally patients under age 65, Medicare eligibility begins three months after the month in which the patient begins dialysis treatments. During this three-month waiting period either Medicaid, private insurance or the patient is responsible for payment for dialysis services. Medicare generally waives this waiting period for individuals who participate in a self-care dialysis training program, or are hospitalized for a kidney transplant and the surgery occurs within a specified time period.
 
For ESRD patients under age 65 who have any employer group health insurance coverage, regardless of the size of the employer or the individual’s employment status, Medicare coverage is generally secondary to the employer coverage during the 30-month period that follows the establishment of Medicare eligibility or entitlement based on ESRD. During the period, the patient’s existing insurer is responsible for paying primary benefits at the rate specified in the plan, which may be a negotiated rate or the healthcare provider’s usual and customary rate. As the secondary payor during this period, Medicare will make payments up to the applicable composite rate for dialysis services reimbursed based on the composite rate to supplement any primary payments by the employer group health plan if the plan covers the services but pays only a portion of the charge for the services.
 
Medicare generally is the primary payor for ESRD patients after the 30-month period. Under current rules, Medicare is also the primary payor for ESRD patients during the 30-month period under certain circumstances. Medicare remains the primary payor when an individual becomes eligible for Medicare on the basis of ESRD if, (1) the individual was already age 65 or over or was eligible for Medicare based on disability and (2) the individual’s private insurance coverage is not by reason of current employment or, if it is, the employer has fewer than 20 employees in the case of eligibility by reason of age, or fewer than 100 employees in the case of eligibility by reason of disability. The rules regarding entitlement to primary Medicare coverage when the patient is eligible for Medicare on the basis of both ESRD and age, or disability, have been the subject of frequent legislative and regulatory changes in recent years and there can be no assurance that these rules will not be unfavorably changed in the future.
 
When Medicare is the primary payor for services furnished by dialysis clinics, it reimburses dialysis clinics for 80% of the composite rate, leaving the secondary insurance or the patient responsible for the remaining 20%. The Medicare composite rate is set by Congress and is intended to cover virtually all costs associated with each dialysis treatment, excluding physician services and certain separately billable drugs and laboratory services.


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There is some regional variation in the composite rate, but, the national average for the last three quarters of 2007 is currently approximately $152 per treatment for independent clinics and $157 per treatment for hospital-based dialysis facilities. This is an increase from approximately $149 per treatment for independent clinics and $154 per treatment for hospital-based dialysis facilities in 2006, due to two recent changes in Medicare reimbursement. As a result of legislation enacted in 2003 and first implemented in 2005, the Centers for Medicare and Medicaid Services, or CMS, shifted a portion of Medicare reimbursement dollars for dialysis from separately billable drugs to the composite rate for dialysis services. This drug add-on to the composite rate is subject to an increase based on the estimated rate of growth of drugs and biologicals. For 2007, an additional 0.5% has been shifted from separately billable drugs to the composite rate. In addition, Congress recently passed an additional 1.6% increase to the composite rate for treatments received on or after April, 2007. Depending upon patient case mix, reimbursement may be further improved, based on the case-mix adjustment to the composite rate implemented as a result of the 2003 legislation. Under the case-mix adjustment, Medicare now pays more for larger patients and those under the age of 65. This may be beneficial to our customers, as to date our patient population has tended to be younger and larger than the ESRD national average.
 
CMS rules limit the number of hemodialysis treatments paid for by Medicare to three per week, unless there is medical justification for the additional treatments. The determination of medical justification must be made at the local Medicare contractor level on a case-by-case basis. A clinic’s decision as to how much it is willing to spend on dialysis equipment and services will be at least partly dependent on whether Medicare will reimburse more than three treatments per week for the clinic’s patients.
 
Medicaid.  Medicaid programs are state-administered programs partially funded by the federal government. These programs are intended to provide coverage for certain categories of patients whose income and assets fall below state defined levels and who are otherwise uninsured. For those who are eligible, the programs serve as supplemental insurance programs for the Medicare co-insurance portion and provide certain coverage, for example, self-administered outpatient prescription medications, that is not covered by Medicare. For ESRD treatment, state regulations generally follow Medicare reimbursement levels and coverage without any co-insurance amounts, which is pertinent mostly for the three-month waiting period. Certain states, however, require beneficiaries to pay a monthly share of the cost based upon levels of income or assets.
 
Private Insurers.  Some ESRD patients have private insurance that covers dialysis services. Healthcare providers receive reimbursement for ESRD treatments from the patient or private insurance during a waiting period of up to three months before the patient becomes eligible for Medicare. In addition, if the private payor is an employer group health plan, it is generally required to continue to make primary payments for dialysis services during the 30-month period following eligibility or entitlement to Medicare. In general, employers may not reduce coverage or otherwise discriminate against ESRD patients by taking into account the patient’s eligibility or entitlement to Medicare benefits. It is generally believed that private insurance pays significantly more for dialysis services than Medicare and these patients with private insurance are generally viewed as more profitable to dialysis service providers.
 
Critical Care
 
For Medicare patients, both acute kidney failure and fluid overload therapies provided in an in-patient hospital setting are reimbursed under a traditional diagnosis related group, or DRG, system. Under this system, reimbursement is determined based on a patient’s primary diagnosis and is intended to cover all costs of treating the patient. The presence of acute kidney failure or fluid overload increases the severity of the primary diagnosis and, accordingly, could increase the amount reimbursed. The longer hospitalization stays and higher labor needs, which are typical for patients with acute kidney failure and fluid overload, must be managed for care of these patients to be cost-effective. We believe that there is a significant incentive for hospitals to find a more cost-efficient way to treat these patients in order to improve hospital economics for these therapies.
 
Employees
 
As of July 31, 2007, we had 260 full-time employees, 3 part-time employees and 61 seasonal or temporary employees. From time to time we also employ independent contractors to support our engineering, marketing, sales, clinical and administrative organizations.


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Comment:  link1 "NxSTAGE MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS OF OPERATIONS"
 
NxSTAGE MANAGEMENT’S DISCUSSION AND ANALYSIS OF
FINANCIAL CONDITIONS AND RESULTS OF OPERATIONS
 
You should read the following discussion and analysis of our financial condition and results of operations together with our consolidated financial statements and related notes included elsewhere in this proxy statement. Some information contained in this discussion and analysis or set forth elsewhere in this proxy statement, including information with respect to our plans and strategy for our business, future events and future financial performance, includes forward-looking statements that involve risks and uncertainties. You should review the “Risk Factors” section of this proxy statement for a discussion of important factors that could cause actual result to differ materially from the results described in or implied by the forward-looking statements contained in the following discussion and analysis.
Comment:  link1 "Recent Events"
 
Recent Events
 
Membrana.  In January 2007, we entered into a long-term supply agreement with Membrana, pursuant to which Membrana has agreed to supply, on an exclusive basis, capillary membranes for use in the filters used with the System One for ten years. In exchange, for Membrana’s agreement to pricing reductions based on volumes ordered, we have agreed to purchase a base amount of membranes per year. The agreement may be terminated upon a material breach, generally following a 60-day cure period.
 
Entrada.  On March 13, 2007, we entered into a long-term agreement with the Entrada Group, or Entrada, to establish manufacturing and service operations in Mexico, initially for our cycler and PureFlow SL disposables and later for our PureFlow SL hardware. The agreement obligates Entrada to provide us with manufacturing space, support services and a labor force through 2012.
 
MDS Stock Purchase.  As discussed above, on June 4, 2007 we entered into a stock purchase agreement with Mr. Utterberg, who is a member of our board of directors and owns 6.7% of our outstanding common stock, pursuant to which we will acquire all of the outstanding equity of each MDS Entity and each MDS Entity will become a wholly-owned subsidiary of ours. Mr. Utterberg will receive 6,500,000 shares of our common stock, subject to a post-closing working capital adjustment as consideration for the Stock Purchase. In addition, in connection with the Stock Purchase, we will enter into a consulting agreement with Mr. Utterberg, pursuant to which he will receive $200,000 per year, plus expenses, for a period of two years following the closing of the Stock Purchase.
 
Product Reliability Issue.  In the second quarter of 2007, we started to experience an increased incidence of reported dialysate leaks associated with our System One cartridges. The reported incidence of leaks is higher than we have historically observed. When the System One is used in accordance with its instructions, these leaks present no risk to patient health. System One device labeling anticipates the potential for leaks to occur and specifically warns against leaks and alerts users of the need to observe treatments in order to detect leaks. Four patients with reported leaks, that were unobserved by these patients or their partners until after their treatments were terminated, reported hypotension, or low blood pressure, resolved by a fluid bolus, with no lasting clinical effect. In early August 2007, we sent a letter to our patients and customers informing them of the increased incidence in leaks and reminding them of existing System One labeling alerting users of the potential for leaks and instructing them to observe treatments in order to detect any leaks. We have characterized this notification as a voluntary recall. On August 24, 2007, we elected to initiate a second step in our recall actions, and decided to physically recall the affected lots of cartridge inventory being held by chronic market customers and patients, and replace the affected inventory with newer lots of cartridges at no charge. We have instructed patients and customers to destroy all inventory of affected cartridges they have on hand, and we expect to write-off up to all of the inventory of affected cartridges we have in-house. It is possible that we may be able to rework this cartridge inventory, or reuse certain components of this inventory, but we have not made a final determination related to this recovery.
 
Based on these facts, we determined on August 24, 2007 that we would incur total charges in connection with this recall in the range of $1.9 million to $2.5 million, the principal component of which relates to the write-off of inventory in the range of $1.8 million to $2.2 million. Other charges primarily relate to increased


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shipping for replacement product and cycler servicing costs. Substantially all of these charges would be recorded in the quarter ending September 30, 2007.
 
The increased incidence in leaks has also been associated with increased cycler service requirements, which have led to increased service costs as well as imposed additional service pool requirements on our cycler inventory. In the short term, this may impede our ability to meet customer demand.
 
Resignation of Chief Operating Officer.  On August 28, 2007, Philip R. Licari, our Senior Vice President and Chief Operating Officer, announced his intention to resign from NxStage effective upon the completion of the Stock Purchase.
 
Overview
 
We are a medical device company that develops, manufactures and markets innovative systems for the treatment of end-stage renal disease, or ESRD, acute kidney failure and fluid overload. Our primary product, the System One, is a small, portable, easy-to-use hemodialysis system designed to provide physicians and patients improved flexibility in how hemodialysis therapy is prescribed and delivered. We believe the largest market opportunity for our product is the home hemodialysis market for the treatment of ESRD.
 
From our inception in 1998 until 2002, our operations consisted primarily of start-up activities, including designing and developing the System One, recruiting personnel and raising capital. Historically, research and development costs have been our single largest operating expense. However, with the launch of the System One in the home chronic care market, selling and marketing costs became our largest operating expense in 2005 and this trend continued during the three and six months ended June 30, 2007 as we expanded our United States sales force to penetrate our markets and grow revenues.
 
Our overall strategy since inception has been to (a) design and develop new products for the treatment of kidney failure, (b) establish that the products are safe, effective and cleared for use in the United States, (c) further enhance the product design through field experience from a limited number of customers, (d) establish reliable manufacturing and sources of supply, (e) execute a market launch in both the chronic and critical care markets and establish the System One as a preferred system for the treatment of kidney failure, (f) obtain the capital necessary to finance our working capital needs and build our business and (g) achieve profitability. The evolution of NxStage, and the allocation of our resources since we were founded, reflects this plan. We believe we have largely completed steps (a) through (d), and we plan to continue to pursue the other strategic objectives described above.
 
We sell our products in two markets: the chronic care market and the critical care market. We define the chronic care market as the market devoted to the treatment of patients with ESRD and the critical care market as the market devoted to the treatment of hospital-based patients with acute kidney failure or fluid overload. We offer a different configuration of the System One for each market. The United States Food and Drug Administration, or FDA, has cleared both configurations for hemodialysis, hemofiltration and ultrafiltration. Our products may be used by our customers to treat patients suffering from either condition, although the site of care, the method of delivering care and the duration of care are sufficiently different that we have separate marketing and sales efforts dedicated to each market.
 
We received clearance from the FDA in July 2003 to market the System One for treatment of renal failure and fluid overload using hemodialysis as well as hemofiltration and ultrafiltration. In the first quarter of 2003, we initiated sales of the System One in the critical care market to hospitals and medical centers in the United States. In late 2003, we initiated sales of the System One in the chronic care market and commenced full commercial introduction in the chronic care market in September 2004 in the United States. At the time of these early marketing efforts, our System One was cleared by the FDA under a general indication statement, allowing physicians to prescribe the System One for hemofiltration, hemodialysis and/or ultrafiltration at the location, time and frequency they considered in the best interests of their patients. Our original indication did not include a specific home clearance, and we were not able to promote the System One for home use at that time. The FDA cleared our System One in June 2005 for hemodialysis in the home.


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In March 2006, we received clearance from the FDA to market our PureFlow SL module as an alternative to the bagged fluid presently used with our System One in the chronic care market. This accessory to the System One allows for the automated preparation of high purity dialysate in the patient’s home using ordinary tap water and dialysate concentrate. The PureFlow SL is designed to help patients with ESRD more conveniently and effectively manage their home hemodialysis therapy by eliminating the need for bagged fluids. In July 2006, we released the PureFlow SL for commercial use and began shipping the PureFlow SL product. Our experience suggests that our chronic care home patients will predominantly use our PureFlow SL module at home and will use bagged fluid for travel and outside of the home. Bagged fluids will continue to be used in the critical care market.
 
Medicare provides comprehensive and well-established reimbursement in the United States for ESRD. Reimbursement claims for the System One therapy are typically submitted by the dialysis clinic or hospital to Medicare and other third-party payors using established billing codes for dialysis treatment or, in the critical care setting, based on the patient’s primary diagnosis. Expanding Medicare reimbursement over time to cover more frequent therapy could accelerate our market penetration and revenue growth in the future.
 
Our System One is produced through internal and outsourced manufacturing. We purchase many of the components and subassemblies included in the System One, as well as the disposable cartridges used in the System One, from third-party manufacturers, some of which are single source suppliers. In addition to outsourcing with third-party manufacturers, we assemble, package and label a quantity of disposable products in our leased facilities in Lawrence, Massachusetts and North Andover, Massachusetts as well as in our facilities in Mexico provided to us by the Entrada Group. NxStage GmbH & Co. KG, our wholly-owned German subsidiary, is the sole manufacturer of the dialyzing filter that is a component of the disposable cartridge used in the System One and the ultrafilter used in the PureFlow SL.
 
We market the System One through a direct sales force in the United States primarily to dialysis clinics and hospitals, and we expect revenues to continue to increase in the near future. Our revenues were $10.0 million for the three months ended June 30, 2007, a 121% increase from revenues of $4.5 million in the three months ended June 30, 2006, and a 20% increase from revenues of $8.4 million in the first quarter of 2007. Our revenues were $18.4 million for the six months ended June 30, 2007, a 132% increase from revenues of $7.9 million in the six months ended June 30, 2006. We have increased the number of sales representatives in our combined sales force from 27 at June 30, 2006 to 31 at June 30, 2007. During the remainder of 2007, we expect to add additional sales and marketing personnel as needed for the remainder of 2007. As of June 30, 2007, 1,615 ESRD patients were using the System One at 265 dialysis clinics, compared to 663 ESRD patients at 126 dialysis clinics as of June 30, 2006, and compared to 1,022 ESRD patients at 174 dialysis clinics as of December 31, 2006. In addition, as of June 30, 2007, 93 hospitals were using the System One for critical care therapy, compared to 58 and 77 hospitals as of June 30, 2006 and December 31, 2006, respectively.
 
The following table sets forth the amount and percentage of revenues derived from each market for the periods indicated:
 
                                                                 
    Three Months Ended
    Six Months Ended
 
    June 30,     June 30,  
    2007           2006           2007           2006        
 
Chronic care
  $ 6,746,054       67.3 %   $ 2,665,075       58.6 %   $ 12,180,750       66.2 %   $ 4,482,200       56.4 %
Critical care
    3,285,130       32.7 %     1,881,198       41.4 %     6,224,427       33.8 %     3,464,795       43.6 %
                                                                 
Total
  $ 10,031,184       100.0 %   $ 4,546,273       100.0 %   $ 18,405,177       100.0 %   $ 7,946,995       100.0 %
                                                                 
 
We have not been profitable since inception, and we expect to incur net losses for the foreseeable future as we expand our sales efforts and grow our operations. Our accumulated deficit at June 30, 2007 was $148.5 million. Our goal is to increase our sales volume and revenues to gain scale of operation and to drive product cost reductions, which we believe, when combined with other design improvements, will allow us to reach profitability. We expect our revenues in the chronic care market to increase faster than those in the critical care market and believe they will continue to represent the majority of our revenues.


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Comment:  link1 "Statement of Operations"
 
Statement of Operations
 
Revenues
 
Our product consists of the System One, an electromechanical device used to circulate the patient’s blood during therapy (the cycler); a single-use, disposable cartridge, which contains a preattached dialyzer, and dialysate fluid used in our therapy, sold either in premixed bags or prepared with our PureFlow SL module. We distribute our products in two markets: the chronic care market and the critical care market. We define the chronic care market as the market devoted to the treatment of ESRD patients in the home and the critical care market as the market devoted to the treatment of hospital-based patients with acute kidney failure or fluid overload. We offer a different configuration of the System One for each market. The FDA has cleared both configurations for hemodialysis, hemofiltration and ultrafiltration. Our product may be used by our customers to treat patients suffering from either condition and we have separate marketing and sales efforts dedicated to each market.
 
We derive our revenue from the sale and rental of equipment and the sale of the related disposable products. In the critical care market, we generally sell the System One and disposables to hospital customers. In the chronic care market, customers rent or purchase the machine and then purchase the related disposable products based on a specific patient prescription. We generally recognize revenue when a product has been delivered to our customer, or, in the chronic care market, for those customers that rent the System One, we recognize revenue on a monthly basis in accordance with a contract under which we supply the use of a cycler and the amount of disposables needed to perform a set number of dialysis therapy sessions during a month. For customers that purchase the System One in the chronic care market, we recognize revenue from the equipment sale ratably over the expected service obligation period, while disposable product revenue is recognized upon delivery.
 
Our rental contracts with dialysis centers for ESRD patients generally include terms providing for the sale of disposable products to accommodate up to 26 treatments per month per patient and the purchase or monthly rental of System One cyclers and, in the majority of instances, our PureFlow SL module. These contracts typically have a term of one year and are cancelable at any time by the dialysis clinic with 30 days’ notice. Under these contracts, if home hemodialysis is prescribed, supplies are shipped directly to patient homes and paid for by the treating dialysis clinic. We also include vacation delivery terms, providing for the free shipment of products to a designated vacation destination. We derive an insignificant amount of revenues from the sale of ancillary products, such as extra lengths of tubing. Over time, as more chronic patients are treated with the System One and more systems are placed in patient homes under monthly agreements that provide for the rental of the machine and the purchase of the related disposables, we expect this recurring revenue stream to continue to grow.
 
In the first quarter of 2007, we entered into long-term contracts with three larger dialysis chains, including DaVita, which was our largest customer during the three months ended June 30, 2007. Revenues from DaVita represented approximately 30% of our revenues during the three months ended June 30, 2007, and we expect revenue from DaVita will continue to account for a significant portion of our revenues for the remainder of 2007. Each of these agreements has a term of at least three years, and may be cancelled upon a material breach, subject to certain curing rights. These contracts provide the customer the option to purchase as well as rent the System One equipment, and, in the case of the DaVita contract, DaVita has agreed to purchase rather than rent a significant percentage of its future System One equipment needs. It is not clear what percentage of our customers, if any, will migrate to this model, and we expect, at least in the near term, that the majority of our customers will continue to rent the System One in the chronic care market.
Comment:  link1 "Cost of Revenues"
 
Cost of Revenues
 
Cost of revenues consists primarily of direct product costs, including material and labor required to manufacture our products, service of System One equipment that we rent and sell to customers, production overhead and stock-based compensation. The cost of our products depends on several factors, including the efficiency of our manufacturing operations, the cost at which we can obtain labor and products from third party suppliers, product reliability and related servicing costs and the design of the products.


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We are currently operating at negative gross profit as we continue to build a base of recurring revenue and reduce product costs. We expect the cost of revenues as a percentage of revenues to decline over time for several reasons. First, we continue to realize increased sales volume and realization of economies of scale that are bringing improved purchasing terms and prices, and we are realizing economies of scale that are providing us with broader options and efficiencies in indirect manufacturing overhead costs. Second, we have introduced, and are continuing to introduce, several process and product design changes, such as our new PureFlow SL module, that are expected to have inherently lower cost than our current products. Third, through our relationship with the Entrada Group, we opened a facility that will move the manufacture of certain of our products, including the System One cycler and certain disposables, to lower labor cost markets. Fourth, we are working to improve product reliability. And finally, we continue to look for opportunities to vertically integrate the manufacture of our products that will lead to lower cost, such as with the pending Medisystems acquisition.
Comment:  link1 "Operating Expenses"
 
Operating Expenses
 
Selling and Marketing.  Selling and marketing expenses consist primarily of salary, benefits and stock-based compensation for sales and marketing personnel, travel, promotional and marketing materials and other expenses associated with providing clinical training to our customers. Included in selling and marketing are the costs of clinical educators, usually nurses, we employ to teach our customers about our products and prepare our customers to instruct their patients in the operation of the System One. We anticipate that selling and marketing expenses will continue to increase as we broaden our marketing initiatives to increase public awareness of the System One in the chronic care market and as we add additional sales and marketing personnel.
 
Research and Development.  Research and development expenses consist primarily of salary, benefits and stock-based compensation for research and development personnel, supplies, materials and expenses associated with product design and development, clinical studies, regulatory submissions, reporting and compliance and expenses incurred for outside consultants or firms who furnish services related to these activities. We expect limited research and development expense increases in the foreseeable future as we continue to improve and enhance our core products.
 
Distribution.  Distribution expenses include the freight cost of delivering our products to our customers or our customers’ patients, depending on the market and the specific agreement with our customers, and salary, benefits and stock-based compensation for distribution personnel. We use common carriers and freight companies to deliver our products, and we do not operate our own delivery service. Also included in this category are the expenses of shipping products from customers back to our service center for repair if the product is under warranty, and the related expense of shipping a replacement product to our customers. We expect that distribution expenses will increase at a lower rate than revenue due to expected efficiencies gained from increased business volume, improvements in product reliability, and the continued penetration of our PureFlow SL module in the chronic market, which significantly reduces the weight and quantity of monthly disposable shipments.
 
General and Administrative.  General and administrative expenses consist primarily of salary, benefits and stock-based compensation for our executive management, legal and finance and accounting staff, fees for outside legal counsel, fees for our annual audit and tax services and general expenses to operate the business, including insurance and other corporate-related expenses. Rent, utilities and depreciation expense are allocated to operating expenses based on personnel and square footage usage. We expect that general and administrative expenses will increase in the near term as we add additional administrative support for our growing business.


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Comment:  link1 "Results of Operations"
 
Results of Operations
 
The following table presents, for the periods indicated, information expressed as a percentage of revenues. This information has been derived from our condensed consolidated statements of operations included elsewhere in this proxy statement. You should not draw any conclusions about our future results from the results of operations for any period.
 
                                 
    Three Months Ended
    Six Months Ended
 
    June 30,     June 30,  
    2007     2006     2007     2006  
 
Revenues
    100 %     100 %     100 %     100 %
Cost of revenues
    115       132       116       137  
                                 
Gross profit (deficit)
    (15 )     (32 )     (16 )     (37 )
                                 
Operating expenses:
                               
Selling and marketing
    51       83       54       87  
Research and development
    14       35       16       42  
Distribution
    30       33       29       35  
General and administrative
    25       47       28       52  
                                 
Total operating expenses
    120       198       127       216  
                                 
Loss from operations
    (135 )     (230 )     (143 )     (253 )
                                 
Other income (expense):
                               
Interest income
    9       13       10       15  
Interest expense
    (2 )     (12 )     (2 )     (9 )
                                 
      7       1       8       6  
                                 
Net loss
    (128 )%     (229 )%     (135 )%     (247 )%
                                 
 
Comparison of Three and Six Months Ended June 30, 2007 to Three and Six Months Ended June 30, 2006
 
Revenues
 
Our revenues for the three and six months ended June 30, 2007 and 2006 were as follows:
 
                                 
    Three Months Ended              
    June 30,
    June 30,
          Percentage
 
    2007     2006     Increase     Increase  
    (In thousands, except percentages)  
 
Revenues
  $ 10,031     $ 4,546     $ 5,485       121 %
                                 
 
                                 
    Six Months Ended              
    June 30,
    June 30,
          Percentage
 
    2007     2006     Increase     Increase  
    (In thousands, except percentages)  
 
Revenues
  $ 18,405     $ 7,947     $ 10,458       132 %
                                 
 
The increase in revenues for both the three and six months ended June 30, 2007 as compared to the same periods in 2006 was attributable to increased sales and rentals of the System One in both the critical care and chronic care markets, primarily as a result of increased sales and marketing efforts as we continue our commercial launch of the System One. Revenues in the chronic care market increased to $6.7 million in the three months ended June 30, 2007 compared to $2.7 million in the three months ended June 30, 2006, an increase of 153%, while revenues in the critical care market increased 75% to $3.3 million in the three months ended June 30, 2007, compared to $1.9 million in the three months ended June 30, 2006. Revenues in the


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chronic care market increased to $12.2 million during the six months ended June 30, 2007 compared to $4.5 million during the six months ended June 30, 2006, an increase of 172%, while revenues in the critical care market increased 80% to $6.2 million during the six months ended June 30, 2007, compared to $3.5 million during the six months ended June 30, 2006.
 
Cost of Revenues and Gross Profit (Deficit)
 
                                 
    Three Months Ended              
    June 30,
    June 30,
          Percentage
 
    2007     2006     Increase     Increase  
    (In thousands, except percentages)  
 
Cost of revenues
  $ 11,511     $ 6,004     $ 5,507       92 %
                                 
Gross profit (deficit)
  $ (1,480 )   $ (1,457 )   $ 23       2 %
                                 
Gross profit (deficit) percentage
    (15 )%     (32 )%                
                                 
 
                                 
    Six Months Ended              
    June 30,
    June 30,
          Percentage
 
    2007     2006     Increase     Increase  
    (In thousands, except percentages)  
 
Cost of revenues
  $ 21,428     $ 10,861     $ 10,567       97 %
                                 
Gross profit (deficit)
  $ (3,023 )   $ (2,914 )   $ 109       4 %
                                 
Gross profit (deficit) percentage
    (16 )%     (37 )%                
                                 
 
The increase in cost of revenues was attributable primarily to our increased revenues. We ended June 30, 2007 with 1,615 patients compared to 663 patients ending June 30, 2006, contributing to an increase in material cost of revenues of $4.6 million for the quarter ending June 30, 2007 compared to the same quarter in 2006. In addition, cost of revenues increased during the three months ended June 30, 2007 as compared to the three months ended June 30, 2006 because of a larger employee base that resulted in additional salaries, health benefits and payroll taxes of $647, 000, increased inbound freight costs of $427,000 to support our higher production volume, offset by $392,000 of favorable materials cost due to volume based supplier contacts. We added 593 net patients during the six months ended June 30, 2007 to arrive at 1,615 patients compared to 663 patients ending June 30, 2006, contributing to an additional material cost of revenues of $8.5 million compared to the same period in 2006. In addition, cost of revenues increased during the six months ended June 30, 2007 as compared to the six months ended June 30, 2006 because of a larger employee base which resulted in additional salaries, health benefits and payroll taxes of $1.5 million, and increased inbound freight costs of $825,000 to support our higher production volume, offset by $615,000 of favorable materials cost due to volume based supplier contracts. We continue to see incremental improvement in our direct product costs; however, this is currently being offset somewhat by an increase in disposables per patient due to product reliability issues. We expect that over time as our reliability improves, the disposables per patient will decline.
 
Selling and Marketing
 
                                 
    Three Months Ended              
    June 30,
    June 30,
          Percentage
 
    2007     2006     Increase     Increase  
    (In thousands, except percentages)  
 
Selling and marketing
  $ 5,120     $ 3,759     $ 1,361       36 %
                                 
Selling and marketing as a percentage of revenues
    51 %     83 %                
                                 
 


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    Six Months Ended              
    June 30,
    June 30,
          Percentage
 
    2007     2006     Increase     Increase  
    (In thousands, except percentages)  
 
Selling and marketing
  $ 9,851     $ 6,952     $ 2,899       42 %
                                 
Selling and marketing as a percentage of revenues
    54 %     87 %                
                                 
 
The increase in selling and marketing expenses was the result of several factors. For the three months ended June 30, 2007 compared to the same period in 2006, approximately $1.1 million of the increase was due to additional salaries, health benefits and payroll taxes resulting from increased headcount and $236,000 related to a higher level of sales and marketing activity in both the chronic and critical care markets. We increased our combined sales force from 27 sales representatives as of June 30, 2006 to 31 sales representatives as of June 30, 2007. For the six months ended June 30, 2007 compared to the same period in 2006, approximately $2.4 million of the increase was due to additional salaries, health benefits and payroll taxes resulting from increased headcount and $524,000 related to a higher level of sales and marketing activity in both the chronic and critical care markets. We anticipate that selling and marketing expenses will continue to increase in absolute dollars as we broaden our marketing initiatives to increase public awareness of the System One in the chronic care market and as we add additional sales and marketing personnel.
 
Research and Development
 
                                 
    Three Months Ended              
    June 30,
    June 30,
          Percentage
 
    2007     2006     Decrease     Decrease  
    (In thousands, except percentages)  
 
Research and development
  $ 1,418     $ 1,576     $ (158 )     (10 )%
                                 
Research and development as a percentage of revenues
    14 %     35 %                
                                 
 
                                 
    Six Months Ended              
    June 30,
    June 30,
          Percentage
 
    2007     2006     Decrease     Increase  
    (In thousands, except percentages)  
 
Research and development
  $ 2,854     $ 3,355     $ (501 )     (15 )%
                                 
Research and development as a percentage of revenues
    16 %     42 %                
                                 
 
The decrease in research and development expenses during the three months ended June 30, 2007 compared to the same period in 2006 was attributable to $71,000 resulting from lower clinical trial activities, decrease in salary, benefits and payroll taxes of $51,000 as a result of decreased headcount, and a $30,000 decrease in consulting costs relating to the development of the Pure Flow SL module. The decrease in research and development expenses during the six months ended June 30, 2007 compared to the same period in 2006 was attributable to $247,000 of lower development costs associated with our PureFlow SL module, decreased salary, benefits and payroll taxes of $175,000 as a result of decreased headcount, and a decrease of $54,000 resulting from lower clinical trial activities. We expect research and development expenses will increase in the foreseeable future as we seek to further enhance our System One and related products, and their reliability, but we do not expect that research and development expenses will increase as rapidly as other expense categories as we have substantially completed basic development of the System One. We expect research and development expenses to continue to decline as a percentage of revenues.

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Distribution
 
                                 
    Three Months Ended              
    June 30,
    June 30,
          Percentage
 
    2007     2006     Increase     Increase  
    (In thousands, except percentages)  
 
Distribution
  $ 2,997     $ 1,519     $ 1,478       97 %
                                 
Distribution as a percentage of revenues
    30 %     33 %                
                                 
 
                                 
    Six Months Ended              
    June 30,
    June 30,
          Percentage
 
    2007     2006     Increase     Increase  
    (In thousands, except percentages)  
 
Distribution
  $ 5,342     $ 2,808     $ 2,534       90 %
                                 
Distribution as a percentage of revenues
    29 %     35 %                
                                 
 
The increase in distribution expenses for the three and six month periods ended June 30, 2007 compared to the same period in 2006 was due to increased volume of shipments of disposable products to a growing number of patients in the chronic care market, and due to product reliability issues. We expect that distribution expenses will increase at a lower rate than revenues in the second half of 2007 due primarily to expected shipping efficiencies gained from increased business volume and density of customers, the reduction of higher cost deliveries associated with bagged fluid due to the commercial launch of our PureFlow SL module, which began in July 2006, and the use of an outsourced logistics provider located in the central part of the continental United States.
 
General and Administrative
 
                                 
    Three Months Ended              
    June 30,
    June 30,
          Percentage
 
    2007     2006     Increase     Increase  
    (In thousands, except percentages)  
 
General and administrative
  $ 2,526     $ 2,149     $ 377       18 %
                                 
General and administrative as a percentage of revenues
    25 %     47 %                
                                 
 
                                 
    Six Months Ended              
    June 30,
    June 30,
          Percentage
 
    2007     2006     Increase     Increase  
    (In thousands, except percentages)  
 
General and administrative
  $ 5,193     $ 4,124     $ 1,069       26 %
                                 
General and administrative as a percentage of revenues
    28 %     52 %                
                                 
 
The increase in general and administrative expenses during the three months ended June 30, 2007 compared to the same period in 2006 was primarily due to an increase of $506,000 of professional fees and corporate expenses offset by $158,000 in lower salary and benefits. The increase in general and administrative expenses during the six months ended June 30, 2007 compared to the same period in 2006 was primarily due to an increase of $910,000 of professional fees and corporate expenses and $112,000 in higher salary and benefits. We expect that general and administrative expenses will continue to increase in the near term as we add support structure for our growing business and as a result of costs related to operating a public company.
 
Interest Income and Interest Expense
 
Interest income is derived primarily from U.S. government securities, certificates of deposit, commercial paper and money market accounts. For the three and six month periods ended June 30, 2007, interest income


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increased by $224,000 and $532,000, respectively, due to increased cash and investment balances resulting from our follow-on public offering in June 2006 and our sale of stock to DaVita in February 2007.
 
For the three and six month periods ended June 30, 2007, interest expense decreased by $363,000 and $346,000, respectively, based on the repayment of certain long-term debt arrangements in the three and six month periods ended June 30, 2006.
 
Comparison of Years Ended December 31, 2006 and 2005
 
Revenues
 
Our revenues for 2006 and 2005 were as follows:
 
                                 
    Years Ended              
    December 31,
    December 31,
          Percentage
 
    2006     2005     Increase     Increase  
    (In thousands, except percentages)  
 
Revenues
  $ 20,812     $ 5,994     $ 14,818       247 %
                                 
 
The increase in revenues was attributable to increased sales and rentals of the System One in both the critical care and chronic care markets, primarily as a result of an increase in the number of chronic care patients on therapy resulting from increased sales and marketing efforts. The number of chronic care patients on therapy was 1,022 at December 31, 2006 compared to 292 at December 31, 2005. In addition, we added 104 dialysis clinics in 2006 offering the System One. Revenues in the chronic care market increased to $12.7 million in 2006 from $3.2 million in 2005, an increase of 302%, while revenues in the critical care market increased 186% to $8.1 million in 2006, compared to $2.8 million in 2005. We added an additional 27 hospitals in 2006 that offer the System One.
 
Cost of Revenues and Gross Profit (Deficit)
 
                                 
    Years Ended              
    December 31,
    December 31,
          Percentage
 
    2006     2005     Increase     Increase  
    (In thousands, except percentages)  
 
Cost of revenues
  $ 26,121     $ 9,585     $ 16,536       173 %
                                 
Gross profit (deficit)
  $ (5,309 )   $ (3,591 )   $ 1,718       48 %
                                 
Gross profit percentage
    (25.5 )%     (59.9 )%                
                                 
 
The increase in cost of revenues was attributable primarily to our increased sales volume. For the chronic care market, we added 730 net patients during 2006, which contributed to a $12.9 million increase in cost of revenues. In addition, cost of revenues increased during 2006 because of an increase in manufacturing personnel which resulted in additional salaries, health benefits and payroll taxes of $1.6 million, higher servicing costs of $0.8 million and increased inbound freight costs of $1.1 million to support our higher production volume. We are currently operating at negative gross profit as we continue to build our base of recurring revenues. The improvement in gross margin during 2006 was attributable to (i) increased sales volume and realization of economies of scale that led to better purchasing terms and prices, and efficiencies in indirect manufacturing overhead costs, (ii) lower labor costs for the manufacture of certain of our products, and (iii) continued improvement in product reliability. We expect the cost of revenues as a percentage of revenues to continue to decline over time for these same reasons. In addition, we expect the new PureFlow SL to help reduce future costs of our product offerings. Inventory at December 31, 2006 and December 31, 2005 has been reduced to net realizable value through charges to cost of revenues.


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Selling and Marketing
 
                                 
    Years Ended              
    December 31,
    December 31,
          Percentage
 
    2006     2005     Increase     Increase  
    (In thousands, except percentages)  
 
Selling and marketing
  $ 14,356     $ 7,550     $ 6,806       90 %
                                 
Selling and marketing as a percentage of revenues
    69 %     126 %                
                                 
 
The increase in selling and marketing expenses was the result of several factors. Approximately $4.6 million of the increase was due to higher salary and benefits resulting from increased headcount, $550,000 related to stock-based compensation as a result of the adoption in January 2006 of Statement of Financial Accounting Standards, or SFAS, No. 123R, “Share-Based Payment”. The increase in selling and marketing expense was also the result of $1.3 million related to a higher level of sales and marketing activity in both the chronic and critical care markets. We increased our combined sales force from 20 sales representatives at December 31, 2005 to 24 sales representatives at December 31, 2006. We anticipate that selling and marketing expenses will continue to increase in absolute dollars as we broaden our marketing initiatives to increase public awareness of the System One in the chronic care market and as we add additional sales and marketing personnel.
 
Research and Development
 
                                 
    Years Ended              
    December 31,
    December 31,
          Percentage
 
    2006     2005     Increase     Increase  
    (In thousands, except percentages)  
 
Research and development
  $ 6,431     $ 6,305     $ 126       2 %
                                 
Research and development as a percentage of revenues
    31 %     105 %                
                                 
 
The increase in research and development expenses was attributable to increased salary, benefits and payroll taxes of $306,000 as a result of increased headcount, approximately $124,000 of stock-based compensation as a result of the adoption in January 2006 of SFAS No. 123R, offset by a decrease of $339,000 of development costs associated with our PureFlow SL module which we incurred in 2005 that did not recur in 2006. We expect limited research and development expense increases in the foreseeable future as a substantial portion of the development effort on the System One and PureFlow SL has been completed and future expenditures will be limited to enhancements. We expect research and development expenses to continue to decline as a percentage of revenues.
 
Distribution
 
                                 
    Years Ended              
    December 31,
    December 31,
          Percentage
 
    2006     2005     Increase     Increase  
    (In thousands, except percentages)  
 
Distribution
  $ 7,093     $ 2,059     $ 5,034       244 %
                                 
Distribution as a percentage of revenues
    34 %     34 %                
                                 
 
The increase in distribution expenses in 2006 was due to increased volume of shipments of disposable products to a growing number of patients in the chronic care market. We expect that distribution expenses will increase at a lower rate than revenues during 2007 due to expected shipping efficiencies gained from increased business volume and density of customers, and the reduction of higher cost deliveries associated with bagged fluid due to the commercial launch of our PureFlow SL module which began in July 2006.


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General and Administrative
 
                                 
    Years Ended              
    December 31,
    December 31,
          Percentage
 
    2006     2005     Increase     Increase  
    (In thousands, except percentages)  
 
General and administrative
  $ 8,703     $ 4,855     $ 3,848       79 %
                                 
General and administrative as a percentage of revenues
    42 %     81 %                
                                 
 
The increase in general and administrative expenses was primarily due to approximately $2.0 million of stock-based compensation as a result of the adoption in January 2006 of SFAS No. 123R, and approximately $1.5 million of legal and administrative expenses incurred as a result of operating as a public company. We expect that general and administrative expenses will continue to increase in absolute dollars in the near term as we add support structure for our growing business and as a result of costs related to operating as a public company.
 
Interest Income and Interest Expense
 
Interest income is derived primarily from U.S. government securities, certificates of deposit, commercial paper and money market accounts. For the year ended December 31, 2006, interest income increased by $2.6 million due to increased cash and investment balances available for investment resulting from our initial public offering and follow-on public offering and, to a lesser degree, higher interest rates.
 
Interest expense increased during the year ended December 31, 2006 compared to the same period in 2005 due to the early payoff of a debt agreement, which resulted in the early recognition of approximately $434,000 of interest expense during the second quarter of 2006. We expect interest expense will continue to increase in the future as a result of our 2006 gross borrowings and continued availability under our equipment line of credit.
 
Comparison of Years Ended December 31, 2005 and 2004
 
Revenues
 
Our revenues for 2005 and 2004 were as follows:
 
                                 
    Years Ended              
    December 31,
    December 31,
          Percentage
 
    2005     2004     Increase     Increase  
    (In thousands, except percentages)  
 
Revenues
  $ 5,994     $ 1,885     $ 4,109       218 %
                                 
 
The increase in revenues was attributable to increased sales and rentals of the System One in both the chronic and critical care markets, primarily as a result of increased sales and marketing efforts as we continued our commercial launch of the System One. Revenues in the chronic care market increased to $3.2 million in 2005 from $0.6 million in 2004, an increase of 473%, while revenues in the critical care market increased 112% to $2.8 million in 2005, compared to $1.3 million in 2004.
 
Cost of Revenues and Gross Profit (Deficit)
 
                                 
    Years Ended              
    December 31,
    December 31,
          Percentage
 
    2005     2004     Increase     Increase  
    (In thousands, except percentages)  
 
Cost of revenues
  $ 9,585     $ 3,439     $ 6,146       179 %
                                 
Gross profit (deficit)
  $ (3,591 )   $ (1,554 )   $ 2,037       131 %
                                 
Gross profit percentage
    (59.9 )%     (82.4 )%                
                                 


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The increase in cost of revenues was attributable to our increased sales volume. Contributing to the 2005 negative gross margin was a lower of cost or market valuation allowance in the amount of $0.3 million relating to disposable cartridge and fluid inventory designated for the chronic care market, as well as service costs of approximately $0.5 million to upgrade 100 older cyclers to meet the specifications of our current product generation.
 
Selling and Marketing
 
                                 
    Years Ended              
    December 31,
    December 31,
          Percentage
 
    2005     2004     Increase     Increase  
    (In thousands, except percentages)  
 
Selling and marketing
  $ 7,550     $ 3,334     $ 4,216       126 %
                                 
Selling and marketing as a percentage of revenues
    126 %     177 %                
                                 
 
The increase in selling and marketing expenses was the result of several factors. Approximately $2.7 million of the increase was due to higher salary and benefits resulting from increased headcount, approximately $0.8 million of the increase related to higher travel expenses and the balance of the increase was due to a generally higher level of sales and marketing activity in both the chronic and critical care markets. We increased our sales force from six sales representatives as of December 31, 2004, to 20 sales representatives as of December 31, 2005.
 
Research and Development
 
                                 
    Years Ended              
    December 31,
    December 31,
          Percentage
 
    2005     2004     Increase     Increase  
    (In thousands, except percentages)  
 
Research and development
  $ 6,305     $ 5,970     $ 335       6 %
                                 
Research and development as a percentage of revenues
    105 %     317 %                
                                 
 
The increase in research and development expenses was attributable to increased salary and benefits of approximately $840,000 as a result of increased headcount and development costs associated with our PureFlow SL module, partially offset by a decrease of approximately $520,000 in clinical trial expenses due to the completion of the IDE home trial for System One in 2004.
 
Distribution
 
                                 
    Years Ended              
    December 31,
    December 31,
          Percentage
 
    2005     2004     Increase     Increase  
    (In thousands, except percentages)  
 
Distribution
  $ 2,059     $ 495     $ 1,564       316 %
                                 
Distribution as a percentage of revenues
    34 %     26 %                
                                 
 
The increase in distribution expenses was due to increased volume of shipments of disposable products to a growing number of patients in the chronic market. We expect that distribution expenses will increase at a lower rate than revenues due to expected efficiencies from increased business volume and the use of an outsourced logistics provider located in the central part of the continental United States.


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General and Administrative
 
                                 
    Years Ended              
    December 31,
    December 31,
          Percentage
 
    2005     2004     Increase     Increase  
    (In thousands, except percentages)  
 
General and administrative
  $ 4,855     $ 3,604     $ 1,251       35 %
                                 
General and administrative as a percentage of revenues
    81 %     191 %                
                                 
 
The increase in general and administrative expenses was primarily due to an increase in salary and benefits as a result of the addition of four employees to headcount as well as the adoption of a management bonus plan in 2005.
 
Interest Income and Interest Expense
 
Interest income is derived primarily from U.S. government securities, certificates of deposit and money market accounts. For the year ended December 31, 2005, interest income increased to $0.6 million from $0.1 million in 2004 primarily due to increased cash and investment balances after our initial public offering and slightly higher interest rates in 2005.
 
Interest expense relates to a debt agreement signed in December 2004. Interest expense increased from $15,000 to $763,000, or approximately $748,000 in 2005 compared to 2004 due to this indebtedness being outstanding for a full calendar year.
Comment:  link1 "Liquidity and Capital Resources"
 
Liquidity and Capital Resources
 
We have operated at a loss since our inception in 1998. As of June 30, 2007, our accumulated deficit was $148.5 million and we had cash, cash equivalents and short-term investments of approximately $53.0 million. On February 7, 2007, we issued and sold 2,000,000 shares of common stock to DaVita in which we received net proceeds, after deducting legal expenses, of approximately $19.9 million. On June 14, 2006, we closed a follow-on public offering in which we received net proceeds after deducting underwriting discounts, commissions and expenses of approximately $51.4 million from the sale and issuance of 6,325,000 shares of common stock.
 
On May 15, 2006, we entered into an equipment line of credit agreement for the purpose of financing field equipment purchases and placements. The line of credit agreement provides for the availability of up to $20.0 million through December 31, 2007, and borrowings bear interest at the prime rate plus 0.5% (8.4% as of June 30, 2007). Under the line of credit agreement, $10.0 million is available through December 31, 2006 and a further $10.0 million is available from January 1, 2007 through December 31, 2007. The availability of the line of credit is subject to a number of covenants, including maintaining certain levels of liquidity, adding specified numbers of patients and operating within net loss parameters. We are also required to maintain operating and/or investment accounts with the lender in an amount at least equal to the outstanding debt obligation. Borrowings are secured by all of our assets other than intellectual property and are payable ratably over a three-year period from the date of each borrowing. At June 30, 2007, we had outstanding borrowings of $6.0 million and $11.6 million of borrowings available under the equipment line of credit.


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The following table sets forth the components of our cash flows for the periods indicated (in thousands):
 
                 
    Six Months Ended
 
    June 30,  
    2007     2006  
 
Net cash used in operating activities
  $ (26,672 )   $ (25,492 )
Net cash used in investing activities
    (1,981 )     (1,223 )
Net cash provided by (used in) financing activities
    19,801       52,573  
Effect of exchange rate changes on cash
    17       44  
                 
Net cash flow
  $ (8,835 )   $ 25,902  
                 
 
Net Cash Used in Operating Activities.  For each of the periods above, net cash used in operating activities was attributable primarily to net losses after adjustment for non-cash charges, such as depreciation, amortization and stock-based compensation expense. Significant uses of cash from operations include increases in accounts receivable and increased inventory requirements for production and placements of the System One, offset by increases in deferred accounts payable and accrued expenses. Non-cash transfers from inventory for the placement of rental units with our customers represented $12.0 million and $7.4 million, respectively, during the six months ended June 30, 2007 and 2006.
 
Net Cash Used in Investing Activities.  For each of the periods above, net cash used in investing activities reflected purchases of property and equipment, primarily for research and development, information technology, manufacturing operations and capital improvements to our facilities. Excluded from these figures is the net cash provided by short-term investments and marketable securities of $0.9 million during the six months ended June 30, 2007 and net cash used of $29.5 million of short-term investments during the six months ended June 30, 2006.
 
Net Cash Provided By Financing Activities.  Net cash provided by financing activities reflected $19.9 million of net proceeds received from the issuance of common stock to DaVita in February 2007, and $1.3 million of proceeds from the exercise of stock options and warrants during the six months ended June 30, 2007, offset by the net repayment of debt of $1.4 million and $37,000 during the six months ended June 30, 2007 and 2006, respectively.
 
We expect to continue to incur net losses for the foreseeable future. We expect that our current cash position, and the availability under our equipment line of credit, is sufficient to support operations at least through 2007. In the longer term, we expect to fund the working capital needs of our operations with revenue generated from product placements and sales, but these resources may prove insufficient. If our existing resources are insufficient to satisfy our liquidity requirements, we may need to sell additional equity or issue debt securities. Any sale of additional equity or issuance of debt securities may result in dilution to our stockholders, and we cannot be certain that additional public or private financing will be available in amounts or on terms acceptable to us, or at all. If we are unable to obtain this additional financing when needed, we may be required to delay, reduce the scope of, or eliminate one or more aspects of our business development activities, which could harm the growth of our business. We anticipate that the pending acquisition with Medisystems, if consummated, will have a positive effect on our working capital.
 
The following table summarizes our contractual commitments as of June 30, 2007 (unaudited) and the effect those commitments are expected to have on liquidity and cash flow in future periods:
 
                                         
          Payments Due by Period        
          Less Than
                More Than
 
    Total     One Year     1-3 Years     3-5 Years     5 Years  
    (In thousands)  
 
Equipment line of credit
  $ 6,017     $ 2,800     $ 3,217     $     $  
Operating leases
    3,909       753       1,567       1,543       46  
Purchase obligations(1)
    40,674       22,401       10,131       2,442       5,700  
                                         
Total
  $ 50,600     $ 25,954     $ 14,915     $ 3,985     $ 5,746  
                                         


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(1) Purchase obligations include purchase commitments for System One components, primarily for equipment and fluids pursuant to contractual agreements with several of our suppliers. Certain of these commitments may be extended and/or canceled at our option.
Comment:  link1 "Summary of Critical Accounting Policies and Estimates"
 
Summary of Critical Accounting Policies and Estimates
 
Our discussion and analysis of our financial condition and results of operations are based upon our consolidated financial statements, which have been prepared in accordance with U.S. generally accepted accounting principles. The preparation of these consolidated financial statements requires us to make significant estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses. These items are regularly monitored and analyzed by management for changes in facts and circumstances, and material changes in these estimates could occur in the future. Changes in estimates are recorded in the period in which they become known. We base our estimates on historical experience and various other assumptions that we believe to be reasonable under the circumstances. Actual results may differ substantially from our estimates.
 
A summary of those accounting policies and estimates that we believe are most critical to fully understanding and evaluating our financial results is set forth below. This summary should be read in conjunction with our consolidated financial statements and the related notes included elsewhere in this proxy statement.
 
Revenue Recognition
 
We recognize revenues from product sales and services when earned in accordance with Staff Accounting Bulletin, or SAB, No. 104, “Revenue Recognition”, and Emerging Issues Task Force, or EITF 00-21, “Revenue Arrangements with Multiple Deliverables”. Revenues are recognized when: (a) there is persuasive evidence of an arrangement, (b) the product has been shipped or services and supplies have been provided to the customer, (c) the sales price is fixed or determinable and (d) collection is reasonably assured.
 
Chronic Care Market
 
Prior to 2007, we derived revenue in the chronic care market from short-term rental arrangements with our customers as our principal business model in the chronic care market. These rental arrangements, which combine the use of the System One with a specified number of disposable products supplied to customers for a fixed amount per month, are recognized on a monthly basis in accordance with agreed upon contract terms and pursuant to a binding customer purchase order and fixed payment terms. Rental arrangements continue to represent the majority of the arrangements we have with our customers in the chronic care market.
 
Beginning in 2007, we entered into long-term customer contracts to sell System One and PureFlow SL equipment along with the right to purchase disposable products and service on a monthly basis. Some of these agreements include other terms such as development efforts, training, market collaborations, limited market exclusivity, and volume discounts. The equipment and related items provided to our customers in these arrangements are considered a multiple-element sales arrangement pursuant to EITF 00-21. When a sales arrangement involves multiple elements, the deliverables included in the arrangement are evaluated to determine whether they represent separate units of accounting. We have determined that we cannot account for the sale of equipment as a separate unit of accounting. Therefore, fees received upon the completion of delivery of equipment are deferred, and recognized as revenue on a straight line basis over the expected term of our obligation to supply disposables and service, which is five to seven years. We have deferred both the unrecognized revenue and direct costs relating to the delivered equipment, which costs are being amortized over the same period as the related revenue.
 
We entered into a national service provider agreement and a stock purchase agreement with DaVita on February 7, 2007. Pursuant to EITF 00-21, we consider these agreements a single arrangement. In connection with the stock purchase agreement, DaVita purchased 2,000,000 shares of our common stock for $10.00 per share, which represented a premium of $1.50 per share, or $3.0 million over the current market price. We have


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recorded the $3.0 million premium as deferred revenue and will recognize this revenue ratably over seven years, consistent with our equipment service obligation to DaVita. During the three and six months ended June 30, 2007, we recognized revenue of $107,000 and $179,000, respectively, associated with the $3.0 million premium.
 
Critical Care Market
 
In the critical care market, sales are structured as direct product sales or as a disposables-based program in which a customer acquires the equipment through the purchase of a specific quantity of disposables over a specific period of time. We recognize revenues from direct product sales at the later of the time of shipment or, if applicable, delivery in accordance with contract terms. Under a disposables-based program, the customer is granted the right to use the equipment for a period of time, during which the customer commits to purchase a minimum number of disposable cartridges or fluids at a price that includes a premium above the otherwise average selling price of the cartridges or fluids to recover the cost of the equipment and provide for a profit. Upon reaching the contractual minimum purchases, ownership of the equipment transfers to the customer. Revenues under these arrangements are recognized over the term of the arrangement as disposables are delivered. During the reported periods, the majority of our critical care revenues were derived from direct product sales.
 
Our contracts provide for training, technical support and warranty services to our customers. We recognize training and technical support revenue when the related services are performed. In the case of extended warranty, the revenue is recognized ratably over the warranty period.
 
Inventory Valuation
 
Inventories are valued at the lower of cost or estimated market. We regularly review our inventory quantities on hand and related cost and record a provision for excess or obsolete inventory primarily based on an estimated forecast of product demand for each of our existing product configurations. We also review our inventory value to determine if it reflects lower of cost or market, with market determined based on net realizable value. Appropriate consideration is given to inventory items sold at negative gross margins and other factors in evaluating net realizable value. The medical device industry is characterized by rapid development and technological advances that could result in obsolescence of inventory.
 
Field Equipment
 
We amortize field equipment using the straight-line method over an estimated useful life of five years. We review the estimated useful life of five years periodically for reasonableness. Factors considered in determining the reasonableness of the useful life include industry practice and the typical amortization periods used for like equipment, the frequency and scope of service returns, actual equipment disposal rates, and the impact of planned design improvements. We believe the five year useful life is appropriate as of June 30, 2007.
Comment:  link1 "Related-Party Transactions"
 
Related-Party Transactions
 
Medisystems Supply Arrangement
 
We purchase completed cartridges, tubing and certain other components used in the System One disposable cartridge from Medisystems Corporation, an entity owned by David S. Utterberg, a member of our Board of Directors and the owner of approximately 6.7% of our outstanding common stock. We purchased approximately $2.1 million and $3.8 million during the three and six months ended June 30, 2007, and $1.2 million and $1.9 million for the three and six months ended June 30, 2006, respectively, of goods and services from this related party. Amounts owed to Medisystems Corporation totaled $665,000 and $926,000 at June 30, 2007 and December 31, 2006, respectively, and are included in accounts payable in the accompanying condensed consolidated balance sheets. At June 30, 2007, we had commitments to purchase approximately $3.2 million of products from Medisystems Corporation.


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On January 4, 2007, we entered into a seven-year Supply Agreement, which we refer to as the Medisystems Supply Agreement, with MDS that expires on December 31, 2013. Prior to entering into the Medisystems Supply Agreement, we purchased products from MDS through purchase orders. Pursuant to the terms of the Medisystems Supply Agreement, we will purchase no less than ninety percent (90%) of our North American requirements for disposal cartridges, or MDS products, for use with our System One from MDS.
 
As further described in this proxy statement, on June 4, 2007, we entered into a stock purchase agreement with Mr. Utterberg pursuant to which we will acquire all of the outstanding equity of each MDS Entity and each MDS Entity will become a direct or indirect wholly-owned subsidiary of ours.
 
Consistent with the requirements of our Audit Committee Charter, these transactions were reviewed and approved by our Audit Committee, which is comprised solely of independent directors, as well as our board of directors.
Comment:  link1 "Off-Balance Sheet Arrangements"
 
Off-Balance Sheet Arrangements
 
Since inception we have not engaged in any off-balance sheet financing activities except for leases which are properly classified as operating leases and disclosed in the “Liquidity and Capital Resources” section above.
Comment:  link1 "Recent Accounting Pronouncements"
 
Recent Accounting Pronouncements
 
In September 2006, the FASB issued SFAS No. 157, Fair Value Measurements”, which addresses the measurement of “fair value” where such measure is required for recognition or disclosure purposes under GAAP. Among other provisions, SFAS No. 157 includes (i) a new definition of fair value, (ii) a fair value hierarchy used to classify the source of information used in fair value measurements, (iii) new disclosure requirements of assets and liabilities measured at fair value based on their level in the hierarchy, and (iv) a modification of the accounting presumption that the transaction price of an asset or liability equals its initial fair value. SFAS No. 157 is effective for fiscal years beginning after November 15, 2007 (i.e., beginning in 2008 for NxStage). We are currently evaluating the impact of SFAS No. 157 on our consolidated financial statements.
 
In February 2007, the FASB issued SFAS No. 159, The Fair Value Option for Financial Assets and Financial Liabilities — Including an amendment of FASB Statement No. 115,” which permits entities to choose to measure many financial instruments and certain other items at fair value. SFAS No. 159 is effective as of the beginning of an entity’s first fiscal year that begins after November 15, 2007. We are currently evaluating if we will elect the fair value option for any of our eligible financial instruments and other items.


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Comment:  link1 "QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT NXSTAGE’S MARKET RISK"
 
QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT NXSTAGE’S MARKET RISK
Comment:  link1 "Interest Rate Exposure"
 
Interest Rate Exposure
 
Our investment portfolio consists primarily of high-grade commercial paper, certificates of deposit and debt obligations of various governmental agencies. We manage our investment portfolio in accordance with our investment policy. The primary objectives of our investment policy are to preserve principal, maintain a high degree of liquidity to meet operating needs and obtain competitive returns subject to prevailing market conditions. Investments are made with a maturity of no more than 180 days. These investments are subject to risk of default, changes in credit rating and changes in market value. These investments are also subject to interest rate risk and will decrease in value if market interest rates increase. Due to the conservative nature of our investments and relatively short effective maturities of the debt instruments, we believe interest rate risk is mitigated. Our investment policy specifies the credit quality standards for our investments and limits the amount of exposure from any single issue, issuer or type of investment.
 
As of December 31, 2006, we had outstanding debt obligations of $7.4 million with a floating interest rate equal to one-half percentage point (0.50%) above the prime rate (8.75% at December 31, 2006). Movements in market interest rates could impact the fair value of our debt. As of December 31, 2006, the carrying amount of our debt approximated fair value.
Comment:  link1 "Foreign Currency Exposure"
 
Foreign Currency Exposure
 
We operate a manufacturing and research facility in Rosdorf, Germany. We purchase materials for that facility and pay our employees at that facility in Euros. In addition, we purchase products for resale in the United States from foreign companies and have agreed to pay them in currencies other than the U.S. dollar. We also have contracts with key suppliers that expose us to foreign currency risks. As a result, our expenses and cash flows are subject to fluctuations due to changes in foreign currency exchange rates. In periods when the U.S. dollar declines in value as compared to the foreign currencies in which we incur expenses, our foreign-currency based expenses increase when translated into U.S. dollars. Although it is possible to do so, we do not currently hedge our foreign currency since the exposure has not been material to our historical operating results. A 10% movement in the Euro would have had an overall impact to the statement of operations of approximately $633,000 for 2006, which would have been approximately 1.1% of total annual expenses.
Comment:  link1 "Equity Security Price Risk"
 
Equity Security Price Risk
 
As a matter of policy, we do not invest in marketable equity securities; therefore, we do not currently have any direct equity price risk.
 
There were no material changes in our market risk exposure since December 31, 2006.


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Comment:  link1 "MEDISYSTEMS BUSINESS"
 
MEDISYSTEMS BUSINESS
 
Overview
 
MDS is a privately held, medical device company that designs, manufactures, assembles, imports, exports and distributes disposables used in dialysis and related blood treatments and procedures, primarily in the United States. MDS is headquartered in Seattle, Washington and operates its business in conjunction with the other MDS Entities, which are collectively referred to as Medisystems and include:
 
  •  MDS Italy, which molds and assembles components for end-products at a manufacturing facility in Sorbara, Modena, Italy;
 
  •  MDS Mexico, which manufactures and assembles finished goods at a manufacturing facility located in Tijuana, Baja California, Mexico; and
 
  •  MDS Services, which provides contract employee services to MDS from its base operations in Las Vegas, Nevada.
 
Medisystems is also affiliated with the following entities that are not being acquired by NxStage in the Stock Purchase:
 
  •  DSU Medical, which holds the intellectual property relating to Medisystems’ products;
 
  •  MRC, which is a research and development facility with an office outside Chicago, Illinois;
 
  •  MTC, which merged with DSU Medical in May 2007, and had been responsible for securing intellectual property licenses for the components utilized in Medisystems’ products and funding the research and development activities of MRC; and
 
  •  LSM and ICS, neither of which has operations of significance.
 
Medisystems products address two markets for use: hemodialysis and apheresis, with hemodialysis historically being the more significant market. Products are produced through internal and outsourced manufacturing and are marketed and sold under the Medisystems brand name, primarily through distributors, to clinics in the United States. A portion of products are sold to distributors for resale under the distributor’s brand name.
 
Hemodialysis Market
 
The market for dialysis equipment and disposables in the United States has undergone rapid growth since 1972, the year Congress extended Medicare coverage to all patients, regardless of age, with ESRD. ESRD, which affects approximately 472,000 people in the United States, is an irreversible, life-threatening loss of kidney function that is treated predominantly with dialysis. Dialysis is a kidney replacement therapy that removes toxins and excess fluids from the bloodstream and, unless the patient receives a kidney transplant, is required for the remainder of the patient’s life. Over 70% of ESRD patients in the United States rely on life-sustaining dialysis treatment. Demographic factors, including an aging population and the increasing incidence of diabetes and hypertension, two diseases that typically presage the onset of ESRD, along with increasing life expectancy due to improved treatment methods, have helped grow the market for dialysis treatment in the United States.
 
Hemodialysis, the most widely prescribed form of dialysis, typically consists of treatments in a clinic three times per week, with each session lasting three to five hours. The process involves a range of equipment and supplies. Machinery is required to pump the blood, prepare and deliver dialysate (a blood cleansing solution containing salts and glucose), and generally monitor the system for safe operation. In addition, dialyzers (filters that act like an artificial kidney), bloodlines, needles and assorted other items are needed in dialysis. The industry typically makes a distinction between “equipment,” such as the blood pump and delivery system used in dialysis, and “disposables,” such as the dialyzer, blood lines and needles that are usually disposed of after each use. There is also a range of “consumables” used during the process, that include the


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dialysate, heparin (a drug used to prevent blood clotting) and saline (the solution used to prime and rinse the dialyzer).
 
During the hemodialysis procedure, blood is conducted via external, single-use, disposable blood tubing, referred to as bloodlines, through a dialyzer, where toxins and excess fluids are removed. An arteriovenous, or AV, fistula, which is a passageway between an artery and a vein, is created using a special needle set to provide access to the patient’s blood stream for the procedure.
 
Prior to 1981, disposables for use in hemodialysis were custom designed by each dialysis clinic customer. Medisystems’ initial strategy was to create high quality, low cost, standardized hemodialysis disposables, specifically targeting the lowest cost disposable bloodlines and needles. In 1981, Medisystems began offering FDA-approved, standardized blood tubing sets, AV fistula needle sets and dialysis priming sets.
 
In 1983, in an effort to control rapidly increasing hemodialysis costs, the U.S. government changed the reimbursement scheme for dialysis treatment from a cost-plus reimbursement to the composite rate structure that remains in place today. The change had three main effects: shifting the majority of procedure volumes from hospitals to lower-cost independently-owned clinics; prompting the consolidation of independently-owned clinics among a few, large-scale owners as a means of reducing overhead cost and maximizing profitability; and refocusing the hemodialysis industry on opportunities to control treatment delivery costs.
 
Medisystems, with its focus on high-quality, low-cost, standardized disposables, was able to take advantage of the treatment providers’ need to reduce costs and their resulting shift from custom disposables to standardized disposables during the mid-1980s and establish itself as a leading supplier of bloodlines and needle disposables for hemodialysis.
 
Products for the Hemodialysis Market
 
Medisystems’ hemodialysis bloodlines products include the Readyset High Performance Blood Tubing sets, the first integrated bloodline sets on the market; and its latest generation bloodline set, the StreamLine2 Blood Tubing System, designed to achieve better patient outcomes at lower costs to clinics.
 
Medisystems has offered AV fistula needle sets in the United States since 1981. In 1991, the Occupational Safety and Health Administration in the United States, or OSHA, issued a recommendation that encouraged employers to evaluate and implement devices to improve workplace safety by minimizing the risk of blood exposure through needle-stick or other injuries when dealing with blood borne pathogens. That same year, Medisystems introduced the AV Fistula Needles with PointGuard Anti-Stick Needle Protectors, the first safety guard for AV fistula needles marketed in the United States. In 1995, Medisystems introduced its second generation safety guard, MasterGuard, which has been shown in a published study to reduce needlestick injuries. In 2000, the U.S. Congress passed the Needlestick Safety and Prevention Act, authorizing OSHA to require employers, including office-based physicians, to select safer medical devices, including self-sheathing needles.
 
Most hemodialysis patients require treatment at least three times a week for the rest of their lives. Clinical experience demonstrates that the incidence of pain, hematoma, infection and infiltrations at the needle insertion site can be reduced by using what is called the “constant-site technique” — inserting the fistula needle in the same place each treatment. Medisystems has developed the Buttonhole Needle Set, an anti-stick, dull bevel needle set specifically designed for use with this constant-site technique.
 
Other hemodialysis products that Medisystems manufactures and sells include:
 
  •  safety devices and access management devices, including the ViraGuard patient-transducer protector, a connection device that includes a membrane providing protection for hemodialysis pressure monitors and for maintaining the sterility of the fluid pathway;
 
  •  the Medic plastic anti-stick needle/connector device, designed to help reduce the risk of accidental needlesticks;


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  •  dialysis priming sets, which are used to expel air and set the solution before connecting to the patient, specifically designed for hemodialysis that feature needleless access ports, large inner diameter tubing intended to allow relatively fast and easy flows, and a unique spike and chamber design to help prevent air bubbles from entering the line; and
 
  •  the Access Alert Pressure Measurement Filter, for use with Medisystems’ AV fistula needles, designed to easily measure static intra-access pressure.
 
Apheresis Market
 
Therapeutic apheresis is a technique for removing harmful components from a patient’s blood and is used in the treatment of autoimmune diseases and other disorders.
 
Therapeutic apheresis services are generally provided upon the request of a hospital, which has received an order from a patient’s physician. Therapeutic treatments are administered using blood cell separator equipment and the disposables needed to perform the procedure.
 
Therapeutic apheresis is the primary therapy for patients suffering from:
 
  •  Goodpasture syndrome — a rare autoimmune disease affecting the lungs and kidneys;
 
  •  thrombotic thrombocytopenic purpura — a life-threatening blood disease;
 
  •  sickle cell disease — an inherited blood disorder affecting the red blood cells;
 
  •  Guillain-Barre syndrome — an autoimmune disorder affecting the nervous system; and
 
  •  chronic inflammatory demyelinating polyneuropathy — a rare neurological disorder.
 
Therapeutic apheresis is also used as a supportive or adjunct therapy for patients suffering from diseases such as multiple myeloma, a cancer of the plasma cells; Lambert-Eaton myasthenic syndrome, an autoimmune disease causing muscle weakness; systemic lupus erythematosus, an autoimmune disorder causing chronic inflammation of connective tissues; and systemic vasculitis, inflammation of the blood vessels. The main providers of therapeutic apheresis are regional and community blood banks, although many dialysis clinics also offer these services.
 
Medisystems received its first FDA clearance to market needle sets used during apheresis procedures in 1986. Its primary apheresis needle is the Apheresis Needle with MasterGuard Anti-Stick Needle Protector, designed to protect against needle sticks immediately upon removal and through time of disposal. Medisystems also designed its Medic plastic anti-stick needle/connector for use with apheresis procedures.
 
Medisystems Strategy
 
Medisystems’ overall strategy since inception has been to (1) design, develop, and manufacture high quality, low cost disposables for use in dialysis and blood treatments and procedures in the United States; (2) continue to enhance the function of products by continuously innovating the design and methods for treatment delivery; (3) protect innovations by patenting designs and methods in the United States and in key markets worldwide; (4) educate customers on the value of enhanced product designs; (5) establish reliable manufacturing and sources of supply; (6) establish reliable sources of distribution; and (7) maintain sufficient cash flow and profitability to fund growth in operations without the need for significant outside capital.
 
Recent Developments
 
In January 2007, Medisystems entered into a seven-year agreement with NxStage to supply no less than 90% of their North American requirements for disposable cartridges for use with their primary home hemodialysis product, the System One.
 
In May 2007, MTC merged into DSU Medical, with DSU Medical being the surviving entity.


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For the period January 1, 2007 through May 31, 2007, at the discretion of the sole common stockholder, Mr. Utterberg, and in contemplation of a renegotiation of existing agreements, DSU Medical did not charge royalty payments to MTC, and MTC, in turn, did not charge royalty to MDS. Effective June 1, 2007, DSU Medical and MDS terminated the royalty sublicense agreement to MDS for consideration of $2.7 million to be paid to DSU Medical. A new, royalty-free license agreement between DSU Medical and MDS was entered into effective June 1, 2007.
 
In June 2007, Mr. Utterberg, the common stockholder of the Medisystems Group, entered into an agreement with NxStage, pursuant to which NxStage has agreed to purchase the issued and outstanding shares of MDS, MDS Services, MDS Italy and MDS Mexico in exchange for 6,500,000 shares of NxStage common stock, subject to adjustment. The transaction is expected to close in 2007.
Comment:  link1 "Medisystems Products"
 
Medisystems Products
 
Medisystems manufactures and distributes a number of different products, including private label products, for use predominantly in hemodialysis. Its primary sources of revenue are from blood tubing sets, used for hemodialysis, and needle sets, used in hemodialysis and apheresis. In 2006, revenues from blood tubing sets accounted for 56% of Medisystems’ gross revenues. Revenues from needle sets accounted for 29%, and revenues from the sale of products to NxStage accounted for 7%, of Medisystems’ gross revenues in 2006.
 
Readyset
 
The Readyset High Performance Blood Tubing Sets, which Medisystems introduced for use in hemodialysis in 1993, feature a proprietary pump segment and proprietary material designed to deliver reliable, accurate flows throughout the treatment. The kink-resistant blood tubing is designed to be easy to handle and to enable relatively fast priming, or removal of air from the dialysate solution. These technological advances, along with a patented process for treatment delivery, are intended to result in Kt/V, which is the measure for how much waste is removed from the patient’s blood during dialysis, that better reflects the Kt/V prescribed by a patient’s physician.
 
StreamLine2
 
In 2006, Medisystems introduced its latest generation bloodline product, StreamLine2. The StreamLine2 product line is covered by a number of U.S. and foreign patents. Also, a number of U.S. and foreign patent applications have been submitted, though there can be no assurance any of these applications will be granted. StreamLine2’s airless design and other technologies have been shown in two clinical studies to result in superior clinical and economic performance. StreamLine also includes Medisystems patented LockSite needleless access sites, eliminating the need for dangerous needles and expensive guarded needles, improving a clinic’s ability to meet OSHA anti-stick requirements.
 
AV Fistula and Apheresis Needles with MasterGuard Anti-Stick Needle Protectors
 
Medisystems has designed its AV fistula and apheresis needles to achieve a smooth blood flow throughout the treatment, intended to result in less clotting, lower pressure drops, and less stress on the patient’s blood. In addition, in a published study, Medisystems’ AV fistula and apheresis needles with Masterguard anti-stick needle protectors were shown to significantly reduce needle stick injuries compared to conventional, unguarded needles.
 
ButtonHole Needle Set
 
The constant-site technique is used worldwide to insert the needle in the vascular access site for hemodialysis patients with native, or human, AV fistulaes. Clinical experience demonstrates that the incidence of pain, hematoma, infection and infiltrations at the needle insertion site can be reduced by utilizing the constant-site technique. Medisystems’ ButtonHole AV fistula needle has an anti-stick, dull bevel design ideally suited for the constant-site technique, while also reducing the risk of accidental needle sticks.


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Transducer Protectors with ViraGuard
 
Transducer protectors are single-use air filter devices used to protect hemodialysis pressure monitors during treatments. Medisystems’ transducer protectors include the ViraGuard membrane, designed to maintain the sterility of the fluid pathway and act as a