Janus Investment Fund · 497 · On 2/27/08

Filed On 2/27/08 6:29pm ET   ·   SEC File 2-34393   ·   Accession Number 1035704-8-92

Definitive Material   ·   Rule 497
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 497         Prospectus & Sai Supplements                           9     20K 

497
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Janus Investment Fund 
Janus Equity Funds
Janus Bond and Money Market Funds 

Supplement dated February 28, 2008
to Currently Effective Prospectuses 

Effective April 1, 2008, this supplement expires.                               

Effective through March 31, 2008, the following will apply.                     

AVAILABILITY OF PORTFOLIO HOLDINGS INFORMATION                                  

The Mutual Fund Holdings Disclosure Policies and Procedures adopted by Janus    
Capital and all mutual funds managed within the Janus fund complex are designed 
to be in the best interests of the funds and to protect the confidentiality of  
the funds' portfolio holdings. The following describes policies and procedures  
with respect to disclosure of portfolio holdings.                               

- FULL HOLDINGS. Each fund is required to disclose its complete holdings in the 
  quarterly holdings report on Form N-Q within 60 days of the end of each fiscal
 quarter, and in the annual report and semiannual report to fund shareholders.
These reports (i) are available on the SEC's website at http://www.sec.gov; 
(ii) may be reviewed and copied at the SEC's Public Reference Room in       
 Washington, D.C. (information on the Public Reference Room may be obtained by
  calling 1-800-SEC-0330); and (iii) are available without charge, upon request,
by calling a Janus representative at 1-800-525-0020 (toll free) for those   
 shareholders investing with a fund through an intermediary (or 1-800-525-3713
  for those shareholders investing directly with a fund). Holdings are generally
posted under the Holdings & Details tab of each fund on www.janus.com       
approximately two business days (six business days for money market funds)  
  after the end of the following applicable periods. The non-money market funds'
 portfolio holdings (excluding cash investments, derivatives, short positions,
and other investment positions), consisting of at least the names of the    
holdings, are generally available monthly with at least a 30-day lag.       
 Portfolio holdings of funds subadvised by INTECH are generally available on a
calendar quarter-end basis with at least a 60-day lag. Money market funds'  
portfolio holdings are generally available monthly with no lag.             

- TOP HOLDINGS. Each fund's top portfolio holdings, in order of position size   
  and as a percentage of a fund's total portfolio, are available monthly with at
least a 30-day lag, and quarterly with at least a 15-day lag. Most funds    
disclose their top ten portfolio holdings. However, certain funds disclose  
only their top five portfolio holdings.                                     

- OTHER INFORMATION. Each fund may occasionally provide security breakdowns     
(e.g., industry, sector, regional, market capitalization, and asset         
allocation) and specific portfolio level performance attribution information
  and statistics monthly with at least a 30-day lag, and quarterly with at least
a 15-day lag.                                                               

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Full portfolio holdings will remain available on the Janus websites at least    
until a Form N-CSR or Form N-Q is filed with the SEC for the period that        
includes the date as of which the website information is current. Funds disclose
their short positions, if applicable, only to the extent required in regulatory 
reports. Janus Capital may exclude from publication all or any portion of       
portfolio holdings or change the time periods of disclosure as deemed necessary 
to protect the interests of the Janus funds. A summary of the funds' portfolio  
holdings disclosure policies and procedures, which includes a discussion of any 
exceptions, is contained in the Funds' Statement of Additional Information.     

Please retain this Supplement with your records.

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Janus Investment Fund 
Janus Smart Portfolios

Supplement dated February 28, 2008
to Currently Effective Prospectuses 

Effective April 1, 2008, this supplement expires.                               

Effective through March 31, 2008, the following will apply.                     

AVAILABILITY OF PORTFOLIO HOLDINGS INFORMATION                                  

The Mutual Fund Holdings Disclosure Policies and Procedures adopted by Janus    
Capital and all mutual funds managed within the Janus fund complex are designed 
to be in the best interests of the portfolios and to protect the confidentiality
of the portfolios' holdings. The following describes policies and procedures    
with respect to disclosure of portfolio holdings.                               

- FULL HOLDINGS. Each portfolio is required to disclose its complete holdings in
the quarterly holdings report on Form N-Q within 60 days of the end of each 
fiscal quarter, and in the annual report and semiannual report to portfolio 
shareholders. These reports (i) are available on the SEC's website at       
http://www.sec.gov; (ii) may be reviewed and copied at the SEC's Public     
Reference Room in Washington, D.C. (information on the Public Reference Room
may be obtained by calling 1-800-SEC-0330); and (iii) are available without 
charge, upon request, by calling a Janus representative at 1-800-525-0020   
(toll free) for those shareholders investing with a portfolio through an    
  intermediary (or 1-800-525-3713 for those shareholders investing directly with
a portfolio). Holdings are generally posted under the Holdings & Details tab
of each portfolio on www.janus.com approximately two business days after the
end of the following applicable periods. The portfolios' holdings (excluding
cash investments, derivatives, short positions, and other investment        
positions), consisting of at least the names of the holdings, are generally 
available monthly with at least a 30-day lag.                               

- TOP HOLDINGS. Each portfolio's top portfolio holdings, in order of position   
size and as a percentage of a portfolio's total portfolio, are available    
 monthly with at least a 30-day lag, and quarterly with at least a 15-day lag.

- OTHER INFORMATION. Each portfolio may occasionally provide security breakdowns
(e.g., industry, sector, regional, market capitalization, and asset         
allocation) and specific portfolio level performance attribution information
  and statistics monthly with at least a 30-day lag, and quarterly with at least
a 15-day lag.                                                               

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Full portfolio holdings will remain available on the Janus websites at least    
until a Form N-CSR or Form N-Q is filed with the SEC for the period that        
includes the date as of which the website information is current. Portfolios    
disclose their short positions, if applicable, only to the extent required in   
regulatory reports. Janus Capital may exclude from publication all or any       
portion of portfolio holdings or change the time periods of disclosure as deemed
necessary to protect the interests of the Janus funds. A summary of the         
portfolios' holdings disclosure policies and procedures, which includes a       
discussion of any exceptions, is contained in the Portfolios' Statement of      
Additional Information.                                                         

Please retain this Supplement with your records.

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Janus Investment Fund 

Supplement dated February 28, 2008
to Currently Effective Prospectuses 

Effective April 1, 2008, this supplement expires.                               

Effective through March 31, 2008, the following will apply.                     

AVAILABILITY OF PORTFOLIO HOLDINGS INFORMATION                                  

The Mutual Fund Holdings Disclosure Policies and Procedures adopted by Janus    
Capital and all mutual funds managed within the Janus fund complex are designed 
to be in the best interests of the funds and to protect the confidentiality of  
the funds' portfolio holdings. The following describes policies and procedures  
with respect to disclosure of portfolio holdings.                               

- FULL HOLDINGS. Each fund is required to disclose its complete holdings in the 
  quarterly holdings report on Form N-Q within 60 days of the end of each fiscal
 quarter, and in the annual report and semiannual report to fund shareholders.
These reports (i) are available on the SEC's website at http://www.sec.gov; 
(ii) may be reviewed and copied at the SEC's Public Reference Room in       
 Washington, D.C. (information on the Public Reference Room may be obtained by
  calling 1-800-SEC-0330); and (iii) are available without charge, upon request,
by calling a Janus representative at 1-800-525-0020 (toll free) for those   
 shareholders investing with a fund through an intermediary (or 1-800-525-3713
  for those shareholders investing directly with a fund). Holdings are generally
posted under the Holdings & Details tab of each fund on www.janus.com       
approximately two business days (six business days for money market funds)  
  after the end of the following applicable periods. The non-money market funds'
 portfolio holdings (excluding cash investments, derivatives, short positions,
and other investment positions), consisting of at least the names of the    
holdings, are generally available monthly with at least a 30-day lag.       
 Portfolio holdings of funds subadvised by INTECH are generally available on a
calendar quarter-end basis with at least a 60-day lag. Money market funds'  
portfolio holdings are generally available monthly with no lag.             

- TOP HOLDINGS. Each fund's top portfolio holdings, in order of position size   
  and as a percentage of a fund's total portfolio, are available monthly with at
least a 30-day lag, and quarterly with at least a 15-day lag. Most funds    
disclose their top ten portfolio holdings. However, certain funds disclose  
only their top five portfolio holdings.                                     

- OTHER INFORMATION. Each fund may occasionally provide security breakdowns     
(e.g., industry, sector, regional, market capitalization, and asset         
allocation) and specific portfolio level performance attribution information
  and statistics monthly with at least a 30-day lag, and quarterly with at least
a 15-day lag.                                                               

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Full portfolio holdings will remain available on the Janus websites at least    
until a Form N-CSR or Form N-Q is filed with the SEC for the period that        
includes the date as of which the website information is current. Funds disclose
their short positions, if applicable, only to the extent required in regulatory 
reports. Janus Capital may exclude from publication all or any portion of       
portfolio holdings or change the time periods of disclosure as deemed necessary 
to protect the interests of the Janus funds. A summary of the funds' portfolio  
holdings disclosure policies and procedures, which includes a discussion of any 
exceptions, is contained in the Fund's Statement of Additional Information.     

Please retain this Supplement with your records.

497
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Janus Investment Fund 
Janus Equity and Bond Funds 
Janus Money Market Funds

Supplement dated February 28, 2008
to Currently Effective Statements of Additional Information 

Effective April 1, 2008, this supplement expires.                               

Effective through March 31, 2008, the following will apply.                     

PORTFOLIO HOLDINGS DISCLOSURE POLICIES AND PROCEDURES                           

The Mutual Fund Holdings Disclosure Policies and Procedures adopted by Janus    
Capital and all mutual funds managed within the Janus fund complex are designed 
to be in the best interests of the funds and to protect the confidentiality of  
the funds' portfolio holdings. The following describes policies and procedures  
with respect to disclosure of portfolio holdings.                               

- FULL HOLDINGS. Each fund is required to disclose its complete holdings in the 
  quarterly holdings report on Form N-Q within 60 days of the end of each fiscal
 quarter, and in the annual report and semiannual report to fund shareholders.
These reports (i) are available on the SEC's website at http://www.sec.gov; 
(ii) may be reviewed and copied at the SEC's Public Reference Room in       
 Washington, D.C. (information on the Public Reference Room may be obtained by
  calling 1-800-SEC-0330); and (iii) are available without charge, upon request,
by calling a Janus representative at 1-800-525-0020 (toll free) for those   
 shareholders investing with a fund through an intermediary (or 1-800-525-3713
  for those shareholders investing directly with a fund). Holdings are generally
posted under the Holdings & Details tab of each fund on www.janus.com       
approximately two business days (six business days for money market funds)  
  after the end of the following applicable periods. The non-money market funds'
 portfolio holdings (excluding cash investments, derivatives, short positions,
and other investment positions), consisting of at least the names of the    
holdings, are generally available monthly with at least a 30-day lag.       
 Portfolio holdings of funds subadvised by INTECH are generally available on a
calendar quarter-end basis with at least a 60-day lag. Money market funds'  
portfolio holdings are generally available monthly with no lag.             

- TOP HOLDINGS. Each fund's top portfolio holdings, in order of position size   
  and as a percentage of a fund's total portfolio, are available monthly with at
least a 30-day lag, and quarterly with at least a 15-day lag. Most funds    
disclose their top ten portfolio holdings. However, certain funds disclose  
only their top five portfolio holdings.                                     

- OTHER INFORMATION. Each fund may occasionally provide security breakdowns     
(e.g., industry, sector, regional, market capitalization, and asset         
allocation) and specific portfolio level performance attribution information
  and statistics monthly with at least a 30-day lag, and quarterly with at least
a 15-day lag.                                                               

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Full portfolio holdings will remain available on the Janus websites at least    
until a Form N-CSR or Form N-Q is filed with the SEC for the period that        
includes the date as of which the website information is current. Funds disclose
their short positions, if applicable, only to the extent required in regulatory 
reports. Janus Capital may exclude from publication all or any portion of       
portfolio holdings or change the time periods of disclosure as deemed necessary 
to protect the interests of the Janus funds.                                    

Please retain this Supplement with your records.

497
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Janus Investment Fund 
Janus Smart Portfolios

Supplement dated February 28, 2008
to Currently Effective Statement of Additional Information

Effective April 1, 2008, this supplement expires.                               

Effective through March 31, 2008, the following will apply.                     

PORTFOLIO HOLDINGS DISCLOSURE POLICIES AND PROCEDURES                           

The Mutual Fund Holdings Disclosure Policies and Procedures adopted by Janus    
Capital and all mutual funds managed within the Janus fund complex are designed 
to be in the best interests of the portfolios and to protect the confidentiality
of the portfolios' holdings. The following describes policies and procedures    
with respect to disclosure of portfolio holdings.                               

- FULL HOLDINGS. Each portfolio is required to disclose its complete holdings in
the quarterly holdings report on Form N-Q within 60 days of the end of each 
fiscal quarter, and in the annual report and semiannual report to portfolio 
shareholders. These reports (i) are available on the SEC's website at       
http://www.sec.gov; (ii) may be reviewed and copied at the SEC's Public     
Reference Room in Washington, D.C. (information on the Public Reference Room
may be obtained by calling 1-800-SEC-0330); and (iii) are available without 
charge, upon request, by calling a Janus representative at 1-800-525-0020   
(toll free) for those shareholders investing with a portfolio through an    
  intermediary (or 1-800-525-3713 for those shareholders investing directly with
a portfolio). Holdings are generally posted under the Holdings & Details tab
of each portfolio on www.janus.com approximately two business days after the
end of the following applicable periods. The portfolios' holdings (excluding
cash investments, derivatives, short positions, and other investment        
positions), consisting of at least the names of the holdings, are generally 
available monthly with at least a 30-day lag.                               

- TOP HOLDINGS. Each portfolio's top portfolio holdings, in order of position   
size and as a percentage of a fund's total portfolio, are available monthly 
with at least a 30-day lag, and quarterly with at least a 15-day lag.       

- OTHER INFORMATION. Each portfolio may occasionally provide security breakdowns
(e.g., industry, sector, regional, market capitalization, and asset         
allocation) and specific portfolio level performance attribution information
  and statistics monthly with at least a 30-day lag, and quarterly with at least
a 15-day lag.                                                               

Full portfolio holdings will remain available on the Janus websites at least    
until a Form N-CSR or Form N-Q is filed with the SEC for the period that        
includes the date as of which the website information is current. Portfolios    
disclose their short positions, if applicable, only to the extent required in   
regulatory reports. Janus Capital may exclude from publication all or any       
portion of portfolio holdings or change the time periods of disclosure as deemed
necessary to protect the interests of the Janus funds.                          

Please retain this Supplement with your records.

Dates Referenced Herein   and   Documents Incorporated By Reference

				Referenced-On Page
This 497 Filing		Date		First		Last			Other Filings
Filed On		2/27/08
Filed As Of / Effective As Of		2/28/08		1		9
		3/31/08		1		9
		4/1/08		1		9
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