The class of equity securities to which this statement on Schedule 13D (this “Statement”) relates is the common stock, par value $0.001 per share (“Common Stock”) of Sirius XM Radio Inc., a Delaware corporation (the “Issuer”).  Liberty Media Corporation indirectly owns shares of the Issuer’s Convertible Perpetual Preferred Stock, Series B-1, par value $0.001 per share (“B-1 Preferred Stock”), which are convertible into shares of Common Stock.

The principal executive offices of the Issuer are located at 1221 Avenue of the Americas, 36th Floor, New York, New York, 10020.

(a) This Statement is being filed by Liberty Media Corporation, a Delaware corporation (“Liberty” or the “Reporting Person”).  The Reporting Person beneficially owns shares of B-1 Preferred Stock through its wholly owned subsidiary, Liberty Media, LLC, a Delaware limited liability company (“LM LLC”), which in turn wholly owns Liberty Radio, LLC, a Delaware limited liability company (“Purchaser”).

(b) The principal business address of the Reporting Person is 12300 Liberty Boulevard, Englewood, Colorado 80112.

(c) Purchaser was formed by the Reporting Person for the purpose of holding the B-1 Preferred Stock and the Convertible Perpetual Non-Voting Preferred Stock, Series B-2, par value $0.001 per share (“B-2 Preferred Stock” and together with the B-1 Preferred Stock, the “Preferred Stock”) of the Issuer in connection with the transactions described in Item 3 below.  The Reporting Person’s principal business is owning a broad range of electronic retailing, media, communications and entertainment businesses and investments.

(d) - (f)

Schedule 1 attached to this Statement and incorporated herein by reference provides the requested information with respect to (i) each executive officer and director, as applicable, of the Reporting Person; (ii) each person controlling the Reporting Person; and (iii) each executive officer and director of any corporation or other person ultimately in control of the Reporting Person (the “Schedule 1 Persons”).  All executive officers and directors listed are United States citizens, except for David J.A. Flowers, who is a citizen of Canada, and Michael P. Zeisser, who is a citizen of France.

During the last five years, neither the Reporting Person nor any of the Schedule 1 Persons (to the knowledge of the Reporting Person) has been convicted in a criminal proceeding (excluding traffic violations or

similar misdemeanors).   During the last five years, neither the Reporting Person nor any of the Schedule 1 Persons (to the knowledge of the Reporting Person) has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and, as a result of such proceeding, is or was subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

The Reporting Person acquired beneficial ownership of 1,000,000 shares of B-1 Preferred Stock and 11,500,000 shares of B-2 Preferred Stock (collectively, the “Shares”) on March 6, 2009, in connection with the consummation of certain transactions (collectively, the “Transaction”) pursuant to which the Reporting Person agreed to invest up to an aggregate of $530 million in the form of loans to the Issuer and XM Satellite Radio Inc., a Delaware corporation and a wholly-owned subsidiary of the Issuer (“XM Radio”).  The Transaction was carried out in two separate phases and in accordance with the terms of the Investment Agreement, dated as of February 17, 2009, between the Issuer and Purchaser (the “Investment Agreement”). On February 17, 2009, the Reporting Person and the Issuer entered into a credit agreement (the “Sirius Credit Agreement”) pursuant to which the Reporting Person made available to the Issuer a $280 million senior secured loan facility.  On March 6, 2009, the Reporting Person and XM Radio entered into a credit agreement (the “XM Credit Agreement”) pursuant to which the Reporting Person made available to XM Radio a $150 million senior secured loan facility and purchased by assignment and assumption an additional $100 million of outstanding loans under XM Radio’s existing senior secured credit facilities. In connection with the foregoing, on March 6, 2009 (the “Closing Date”), the Issuer issued the Shares to Purchaser in exchange for an aggregate cash purchase price of $12,500 and as additional consideration for the XM Credit Agreement loans.  The Reporting Person obtained the amounts required for the payment of such cash purchase price and the funding of the above-described loans from its working capital.

At the option of the holder, each share of B-1 Preferred Stock is convertible into 206.9581409 shares of Common Stock, subject to adjustment in accordance with the provisions of the Certificate of Designations of the B-1 Preferred Stock filed with the Secretary of State of the State of Delaware on March 5, 2009 (“B-1 Certificate of Designations”).

The shares of B-2 Preferred Stock are non-voting.  Shares of B-2 Preferred Stock are convertible, at the option of the holder, into shares of B-1 Preferred Stock (on a one-to-one basis) or into shares of Common Stock at the same conversion rate as the shares of B-1 Preferred Stock, subject in either case to the prior expiration or early termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (“HSR Act”).  The expiration of the waiting period under the HSR Act occured on March 30, 2009.  On April 21, 2009, all shares of B-2 Preferred Stock held by the Reporting Person were converted into shares of B-1 Preferred Stock, so that immediately after such conversion the Reporting Person held a total of 12,500,000 shares of B-1 Preferred Stock.

In the event that the holder transfers shares of Preferred Stock to unaffiliated third parties, such shares of Preferred Stock will be automatically converted into shares of Common Stock. 

The Reporting Person acquired beneficial ownership of the Shares for investment purposes.

The Reporting Person intends to continuously review its investment in the Issuer, and may in the future determine (subject to the terms of the Investment Agreement, to the extent applicable) (i) to acquire additional securities of the Issuer, through open market purchases, private agreements or otherwise, (ii) to dispose of all or a portion of the securities of the Issuer owned by it or (iii) to take any other available course of action, which could involve one or more of the types of transactions or have one or more of the results described in the next paragraph of this Item 4.  Notwithstanding anything contained herein, the Reporting Person specifically reserves the right to change its intention with respect to any or all of such matters.  In reaching any decision as to its course of action (as well as to the specific elements thereof), the Reporting Person currently expects that it would take into consideration a variety of factors, including, but not limited to, the following:  the Issuer’s business and prospects; other developments concerning the Issuer and its businesses generally; other business opportunities available to the Reporting Person; developments with respect to the business of the Reporting Person; changes in law and government regulations; general economic conditions; and money and stock market conditions, including the market price of the securities of the Issuer. Notwithstanding the above, any course of action taken by the Reporting Person will be subject to the restrictions described in Item 6 of this Statement.

Other than as set forth in this Statement, the Reporting Person has no present plans or proposals that relate to or would result in:

(a)                                  The acquisition by any person of additional securities of the Issuer, or the disposition of securities of the Issuer;

(b)                                 An extraordinary corporate transaction, such as a merger, reorganization or liquidation, involving the Issuer or any of its subsidiaries;

(c)                                  A sale or transfer of a material amount of assets of the Issuer or of any of its subsidiaries;

(d)                                 Any change in the present board of directors or management of the Issuer, including any plans or proposals to change the number or term of directors or to fill any existing vacancies on the board;

(e)                                  Any material change in the present capitalization or dividend policy of the Issuer;

(f)                                    Any other material change in the Issuer’s business or corporate structure;

(g)                                 Changes in the Issuer’s charter, bylaws or instruments corresponding thereto or other actions which may impede the acquisition of control of the Issuer by any person;

(h)                                 A class of securities of the Issuer being delisted from a national securities exchange or ceasing to be authorized to be quoted in an inter-dealer quotation system of a registered national securities association;

(i)                                     A class of equity securities of the Issuer becoming eligible for termination of registration pursuant to Section 12(g)(4) of the Act; or

(j)                                     Any action similar to any of those enumerated in items (a)-(i) above.

In addition, the matters set forth in Item 6 are incorporated into this Item 4 by reference as if fully set forth herein.

(a) The Reporting Person beneficially owns 2,586,976,761 shares of Common Stock, which represent 40.15% of the shares of Common Stock deemed outstanding.  The shares deemed outstanding is based upon 3,855,656,182 shares of Common Stock outstanding as of March 4, 2009, which information was provided by the Issuer, together with the 2,586,976,761 shares of Common Stock issuable upon conversion of the B-1 Preferred Stock.

(b) Subject to the terms of the Investment Agreement, the Reporting Person has the sole power to vote or to direct the voting of shares of Common Stock beneficially owned by it and has the sole power to dispose or direct the disposition of such shares.  The Reporting Person holds such sole voting and dispositive power indirectly through its 100% ownership interest in LM LLC, which in turn holds such sole voting and dispositive power indirectly through its 100% ownership interest in Purchaser.

(c) The matters set forth in Item 3 are incorporated into this Item 5 by reference as if fully set forth herein.  Other than as stated herein, no transactions were effected by the Reporting Person with respect to the Common Stock, or any interest constituting beneficial ownership of Common Stock, during the 60 days preceding the date hereof.

(d) Not applicable.

(e) Not applicable.

On February 17, 2009, Purchaser entered into the Investment Agreement with the Issuer, and Liberty entered into the Sirius Credit Agreement with the Issuer.  On March 5, 2009, the Issuer filed the B-1 Certificate of

Designations and the Certificate of Designations for the B-2 Preferred Stock (the “B-2 Certificate of Designations”) with the Secretary of State of the State of Delaware.  The B-1 Certificate of Designations and the B-2 Certificate of Designations became effective upon filing on March 5, 2009.  On March 6, 2009, Liberty entered into the XM Credit Agreement with XM Radio and, all conditions to Purchaser’s right to receive the Shares under the Investment Agreement were satisfied, and the closing of the transactions contemplated by the Investment Agreement occurred.

Pursuant to the B-2 Certificate of Designations, shares of B-2 Preferred Stock are non-voting and are convertible into shares of B-1 Preferred Stock (on a one-to-one basis) or into shares of Common Stock at the same conversion rate as the shares of B-1 Preferred Stock, subject in either case to the prior expiration or early termination of the waiting period under the HSR Act.  The expiration of the waiting period under the HSR Act occured on March 30, 2009.  On April 21, 2009, are shares of B-2 Preferred Stock held by the Reporting Person were converted into shares of B-1 Preferred Stock.  Accordingly, no shares of B-2 Preferred Stock are outstanding.

The following is a summary of certain of the material terms of the Investment Agreement and the B-1 Certificate of Designations as each relates to the securities of the Issuer. The following descriptions do not purport to cover all of the provisions of the Investment Agreement, the B-1 Certificate of Designations and are qualified in their entirety by reference to documents, which have been filed as Exhibits hereto and are incorporated into this Statement by reference.  In addition, the Current Reports on Form 8-K of the Issuer filed with the SEC on February 17, 2009 and March 6, 2009 set forth additional information related to the Transaction.

Investment Agreement

Standstill Restrictions

Until the second anniversary of the Closing Date, without the prior written approval of the Independent Common Directors (as defined in the Investment Agreement), none of Purchaser or any of its affiliates may, directly or indirectly, acquire, offer or propose to acquire or agree to acquire beneficial ownership of any Common Stock if such acquisition will result in Purchaser and its affiliates having beneficial ownership of 49.9% or more of the outstanding shares of Common Stock.

From the second anniversary of the Closing Date through the third anniversary of the Closing Date, without the prior written approval of the Independent Common Directors, none of Purchaser or any of its affiliates may, directly or indirectly, acquire, offer or propose to acquire or agree to acquire beneficial ownership of any Common Stock if such acquisition will result in Purchaser and its affiliates having beneficial ownership of 49.9% or more of the outstanding shares of Common Stock, unless such acquisition or offer or agreement is made pursuant to a cash tender offer for all the outstanding shares of Common Stock that are not then beneficially owned by Purchaser or its affiliates at a price per share greater than the closing price of Common Stock on the trading day immediately prior to the earlier of the public announcement or commencement of such tender offer.

Unless otherwise permitted, until the third anniversary of the Closing Date, without the prior written approval of the Independent Common Directors, none of Purchaser or any of its affiliates may, directly or indirectly:

·                  enter into or agree, offer, propose or seek to enter into an acquisition transaction, merger or other business combination relating to the Issuer or any of its subsidiaries or an acquisition transaction for their assets;

·                  make, or participate in, a solicitation of proxies to vote or seek to advise or influence any person or entity with respect to the voting of, any voting securities of the Issuer or its subsidiaries, subject to certain exceptions;

·                  call or seek to call a meeting of shareholders of the Issuer or its subsidiaries or initiate a stockholder proposal with respect to any voting securities of the Issuer, or seek, propose or otherwise act alone or in concert with others to influence or control the management, board of directors or policies of the Issuer or its subsidiaries, subject to certain exceptions; or

·                  bring an action to contest the validity of the provisions described under “Standstill Restrictions” or seek a release of the restrictions described under “Standstill Restrictions”, or

make a public request to amend or waive any provisions described under “Standstill Restrictions.”

Anti-takeover Protections

In connection with the execution of the Investment Agreement, the board of directors of the Issuer adopted certain resolutions (the “Section 203 Resolutions”) approving the Liberty Parties (as defined in the Investment Agreement) and certain related persons as “interested stockholders” within the meaning of Section 203 of the Delaware General Corporation Law (“Section 203”), thereby exempting such persons from the restrictions on business combinations set forth in Section 203.

In addition, the Investment Agreement prohibits the Issuer from (i) amending, modifying or rescinding the Section 203 Resolutions, (ii) adopting any rights plan or charter or bylaw provision that would materially adversely affect Purchaser’s ability to acquire or dispose of the Issuer’s equity securities to a Liberty Party (as defined in the Investment Agreement) or in block transactions (after the third anniversary of the Closing Date), or that otherwise would impose material economic burdens on Purchaser’s ability to do so.

Transfer Restrictions

Except as otherwise permitted by the Investment Agreement, until the second anniversary of the Closing Date, Purchaser may not transfer any Preferred Stock or any Common Stock issued upon conversion of the Preferred Stock to any person except for certain transfers, including:

·                  transfers to (A) an affiliate controlled by or under common control with Purchaser, (B) a Qualified Distribution Transferee (as defined in the Investment Agreement) or an affiliate controlled by or under common control with such Qualified Distribution Transferee, or (C) any other Liberty Party or an affiliate controlled by or under common control with such Liberty Party, in each case where such transferee agrees in writing to be bound by the terms of the Investment Agreement; and

·                  transfers pursuant to a merger, tender officer or exchange offer or other business combination, acquisition of assets or similar transaction or change of control involving the Issuer, which transaction as been approved by the board of directors of the Issuer.

Pursuant to the B-1 Certificate of Designations and the B-2 Certificate of Designations, shares of Preferred Stock will be automatically converted into shares of Common Stock upon a transfer of such shares of Preferred Stock to unaffiliated third parties.

Registration Rights

Subject to certain restrictions and limitations, the Issuer will prepare and file with the Securities and Exchange Commission, no later than September 30, 2009, a shelf registration statement covering the shares of Common Stock issuable upon conversion (“Registrable Securities”) of the Preferred Stock held by Purchaser (Purchaser together with certain permitted transferees, being referred to in this paragraph as the “Holders”), and will use commercially reasonable efforts to cause such shelf registration statement to be declared or become effective on or before December 31, 2009 and remain effective.  If any Holder decides to distribute Registrable Securities through an underwritten or other marketed offering, the Issuer must take reasonable steps to facilitate such offering, subject to certain exceptions and black-out periods.  The Holders are entitled to piggyback registration rights in respect of the Registrable Securities during any period when an effective shelf registration statement is not available.  The Issuer will be obligated to indemnify the Holders, and each Holder will be obligated to indemnify the Issuer, against specified liabilities in connection with misstatements or omissions in any registration statement.

Participation Right

Subject to certain requirements and limitations, in the event the Issuer issues or sells certain equity securities or rights to acquire equity securities in any one or a series of related transactions, Purchaser has the right to purchase from the Issuer either such equity securities or, at Purchaser’s option, securities of the Issuer having substantially the same terms as such equity securities issued or sold, up to an amount sufficient for Purchaser to maintain its then current pro rata equity interest in the Issuer. Participation rights may be assigned or transferred from Purchaser to a Liberty Party.

Election of Directors

Prior to the third anniversary of the closing (unless Purchaser and the other Liberty Parties beneficially own in the aggregate a majority of the voting capital stock of the Issuer), Purchaser and each Liberty Party shall vote any shares of Common Stock beneficially owned by them (excluding for this purpose shares of B-1 Preferred Stock, which has the power to elect directors described below) in favor of the election of directors nominated by the Nominating and Corporate Governance Committee of the Issuer, and shall not nominate, designate, vote for or solicit proxies with respect to any director not so nominated.

B-1 Certificate of Designations

Voting with Common Stock

Holders of B-1 Preferred Stock are entitled to vote with the holders of Common Stock on all matters submitted for a vote of holders of Common Stock, other than the election of directors, and are entitled to notice of stockholder’s meetings.  When voting with Common Stock, the holders of B-1 Preferred Stock will have a number of votes per share of B-1 Preferred Stock equal to the number of shares of Common Stock into which each such share of B-1 Preferred Stock is then convertible.  Each share of B-1 Preferred Stock is initially convertible into 206.9581409 shares of Common Stock, subject to adjustment in accordance with the provisions of the B-1 Certificate of Designations.

Representation on the Board of Directors and Committees of the Issuer

The B-1 Certificate of Designations provides that so long as the holders of B-1 Preferred Stock hold a specified number of shares of B-1 Preferred Stock, they will have the exclusive right, voting separately as a class, to appoint and elect directors (“B-1 Directors”) as follows:

·                  for as long as at least 1,000,000 but less than 3,000,000 shares of B-1 Preferred Stock (or, if less than 1,000,000 shares of B-1 Preferred Stock are then outstanding, an aggregate of 1,000,000 shares of B-1 Preferred Stock and B-2 Preferred Stock) are outstanding, the holders of a majority of the outstanding shares of B-1 Preferred Stock may appoint and elect one director;

·                  for as long as at least 3,000,000 but less than 5,000,000 shares of B-1 Preferred Stock are outstanding, the holders of a majority of the outstanding shares of B-1 Preferred Stock may appoint and elect two directors;

·                  for as long as at least 5,000,000 but less than 7,000,000 shares of B-1 Preferred Stock are outstanding, the holders of a majority of the outstanding shares of B-1 Preferred Stock may appoint and elect three directors (at least one of whom must be an independent director);

·                  for as long as at least 7,000,000 but less than 9,000,000 shares of B-1 Preferred Stock are outstanding, the holders of a majority of the outstanding shares of B-1 Preferred Stock may appoint and elect four directors (at least two of whom must be independent directors);

·                  for as long as at least 9,000,000 but less than 11,000,000 shares of B-1 Preferred Stock are outstanding, the holders of a majority of the outstanding shares of B-1 Preferred Stock may appoint and elect five directors (at least two of whom must be independent directors); and

·                  for as long as at least 11,000,000 shares of B-1 Preferred Stock are outstanding, the holders of a majority of the outstanding shares of B-1 Preferred Stock may appoint and elect six directors (at least three of whom must be independent directors).

If at any time the total number of directors does not equal 15, the number of directors the holders of B-1 Preferred Stock are entitled to appoint and elect will be adjusted proportionately.  The holders of B-1 Preferred Stock will be entitled to elect the B-1 Directors in connection with any annual or special meeting of the stockholders of the Issuer at which directors are to be elected or by written consent in lieu of a meeting.  If there are not sufficient vacancies on the board of directors to permit the election or appointment of all B-1 Directors which the holders of B-1 Preferred Stock are entitled to elect, the number of directors will be increased to accommodate such additional B-1 Directors. Holders of B-1 Preferred Stock have the right to designate a replacement director to the board of directors of the Issuer in order to fill any vacancy of a B-1 Director.

For so long as at least 3,000,000 shares of B-1 Preferred Stock are outstanding, the holders of a majority of the then outstanding shares of B-1 Preferred Stock have the right, subject to compliance with law, to designate one or more B-1 Directors as members of each committee of the Board of Directors, subject to certain limitations and restrictions such as the requirement of independent directors under applicable stock exchange rules.

John C. Malone, Gregory B. Maffei and David J.A. Flowers currently serve as B-1 Directors.  Each of Messrs. Malone, Maffei and Flowers is an executive officer of Liberty, and Mr. Malone and Mr. Maffei are members of Liberty’s board of directors.

Consent Rights

For so long as an aggregate of at least 6,250,000 shares of B-1 Preferred Stock and B-2 Preferred Stock are issued and outstanding, neither the Issuer nor any of its subsidiaries will take any of the following actions without obtaining the prior written consent or affirmative vote of the holders of a majority of the outstanding shares of B-1 Preferred Stock and B-2 Preferred Stock, voting together as a separate class:

·                  any grant, creation, authorization or issuance (or the increase in the authorized number) of any class or series of capital stock or any options, warrants, convertible securities or other rights of any kind to acquire or receive shares of capital stock of the Issuer, or the issuance, sale or other disposition by the Issuer of any shares of capital stock, or of any options, warrants, convertible securities or other such rights, held by the Issuer in treasury, other than in connection with (A) the exercise of employee options in accordance with their terms, or (B) the granting of equity based compensation to the extent approved by the board of directors;

·                  any consolidation or merger with or into any other entity, the consolidation or merger of any other entity with or into the Issuer, or any liquidation, dissolution or winding-up of the business and affairs of the Issuer, or the sale of all or substantially all of the Issuer’s property or business or other assets or the sale of all or substantially all of the stock or assets of XM Satellite Radio, Inc., XM Satellite Radio Holdings, Inc. or Satellite CD Radio Inc.;

·                  subject to certain exceptions, any acquisition or disposition of assets, in each case, having a value of more than $10,000,000, or any series of related acquisitions or dispositions having a value in the aggregate of more than $20,000,000;

·                  any sale or transfer of (including without limitation any spin-off, split-off or similar transaction with respect to) any equity security or ownership interests in any Company Subsidiary (as defined in the Investment Agreement) that at the relevant time is a material Company Subsidiary, any merger or consolidation of any such Company Subsidiary, or any liquidation, dissolution, or sale of substantially all the assets of any such Company Subsidiary, in each case other than any such transaction that would not result in such Company Subsidiary no longer being wholly-owned, directly or indirectly, by the Issuer;

·                  any incurrence of indebtedness, or the assumption or guarantee of the obligations of any person, other than (i) the incurrence, assumption or guarantee of indebtedness not in excess of $10,000,000 per calendar year or (ii) to the extent approved by the board of directors of the Issuer prior to the entry of definitive documentation therefor, the incurrence of indebtedness to refinance, replace or restructure existing indebtedness in an amount not in excess of the principal (or, in the case of any securities with original issuance discount, accreted value), plus premium, if any, and accrued interest on such existing indebtedness;

·                  conducting or engaging in any business in any material respect other than the business in which the Issuer and its subsidiaries are engaged as of the date hereof and any business reasonably related or complementary thereto;

·                  amending, altering, repealing, or adding any provision to the Certificate of Incorporation of Issuer (including, without limitation, the B-1 Certificate of Designations) or By-laws of Issuer in a manner that adversely affects the powers, rights, privileges or preferences of the holders of B-1 Preferred Stock and/or the B-2 Preferred Stock;

·                  except as provided for in the B-1 Certificate of Designations, any increase or decrease in the total number of directors constituting the whole board of directors; and

·                  entering into an agreement for, or committing to agree to take, or consenting to, any of the foregoing actions.

7(a)                            Investment Agreement, dated as of February 17, 2009, between Sirius XM Radio Inc. and Liberty Radio, LLC (filed as Exhibit 4.55 to the Issuer’s Annual Report on Form 10-K (SEC File No. 000-24710) dated March 9, 2009 and incorporated herein by reference).

7(b)                           Certificate of Designations of Series B-1 Convertible Perpetual Preferred Stock of the Issuer, dated March 5, 2009 (filed as Exhibit 3.1 to the Issuer’s Current Report on Form 8-K (SEC File No. 000-24710) dated March 6, 2009 and incorporated herein by reference).