Before you invest, you may want to review the Fund’s Prospectus, which contains more information about the Fund and its risks. You can find the Fund’s Prospectus and other information about the Fund online at janus.com/info. You can also get this information at no cost by calling a Janus representative at 1-877-335-2687 or by sending an email request to prospectusrequest@janus.com.   [JANUS LOGO]

Summary Prospectus dated October 28, 2013
Janus High-Yield Fund
                                     
Ticker:
  JHYAX   Class A Shares   JDHYX   Class S Shares   JHYNX   Class N Shares   JAHYX   Class T Shares    
    JDHCX   Class C Shares   JHYFX   Class I Shares   JHYRX   Class R Shares            
 
INVESTMENT OBJECTIVES
 
Janus High-Yield Fund seeks to obtain high current income. Capital appreciation is a secondary investment objective when consistent with its primary investment objective.
 
FEES AND EXPENSES OF THE FUND
 
This table describes the fees and expenses that you may pay if you buy and hold Shares of the Fund. Each share class has different expenses, but represents an investment in the same Fund. For Class A Shares, you may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund or in other Janus mutual funds. More information about these and other discounts, as well as eligibility requirements for each share class, is available from your financial professional and in the “Purchases” section on page 64 of the Fund’s Prospectus and in the “Purchases” section on page 70 of the Fund’s Statement of Additional Information.
 
                                                                                                                 
SHAREHOLDER FEES
(fees paid directly from your investment)
            Class A               Class C               Class S               Class I               Class N               Class R               Class T  
                                                                                                                 
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price)
            4.75%               None                None                None                None                None                None   
Maximum Deferred Sales Charge (load) (as a percentage of the lower of original purchase price or redemption proceeds)
            None                1.00%               None                None                None                None                None   
                                                                                                                 
ANNUAL FUND OPERATING EXPENSES
(expenses that you pay each year as a percentage of the value of your investment)
            Class A               Class C               Class S               Class I               Class N               Class R               Class T  
                                                                                                                 
Management Fees
    0.56%               0.56%               0.56%               0.56%               0.56%               0.56%               0.56%  
Distribution/Service (12b-1) Fees
    0.25%               1.00%               0.25%               None                None                0.50%               None   
Other Expenses
    0.16%               0.16%               0.31%               0.12%               0.05%               0.31%               0.31%  
Total Annual Fund Operating Expenses
    0.97%               1.72%               1.12%               0.68%               0.61%               1.37%               0.87%  
                                                                                                                 
 
EXAMPLE:
The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and reinvest all dividends and distributions. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
 
                                 
If Shares are redeemed:   1 Year   3 Years   5 Years   10 Years
Class A Shares
  $  569     $  769     $  986     $  1,608  
Class C Shares
  $ 275     $ 542     $ 933     $ 2,030  
Class S Shares
  $ 114     $ 356     $ 617     $ 1,363  
Class I Shares
  $ 69     $ 218     $ 379     $ 847  
Class N Shares
  $ 62     $ 195     $ 340     $ 762  
Class R Shares
  $ 139     $ 434     $ 750     $ 1,646  
Class T Shares
  $ 89     $ 278     $ 482     $ 1,073  
 
 
 
ï  Janus High-Yield Fund


 

                                 
If Shares are not redeemed:   1 Year   3 Years   5 Years   10 Years
Class A Shares
  $  569     $  769     $  986     $  1,608  
Class C Shares
  $ 175     $ 542     $ 933     $ 2,030  
Class S Shares
  $ 114     $ 356     $ 617     $ 1,363  
Class I Shares
  $ 69     $ 218     $ 379     $ 847  
Class N Shares
  $ 62     $ 195     $ 340     $ 762  
Class R Shares
  $ 139     $ 434     $ 750     $ 1,646  
Class T Shares
  $ 89     $ 278     $ 482     $ 1,073  
 
Portfolio Turnover:  The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 93% of the average value of its portfolio.
 
PRINCIPAL INVESTMENT STRATEGIES
 
The Fund pursues its investment objectives by investing, under normal circumstances, at least 80% of its net assets in high-yield/high-risk securities rated below investment grade. Securities rated below investment grade may include their unrated equivalents or other high-yielding securities the portfolio managers believe offer attractive risk/return characteristics. The Fund may at times invest all of its assets in such securities. The Fund may also invest in bank loans, money market instruments, and foreign debt securities (which may include investments in emerging markets). Due to the nature of securities in which the Fund invests, it may have relatively high portfolio turnover compared to other funds.
 
In addition, the Fund may invest its assets in derivatives, which are instruments that have a value derived from, or directly linked to, an underlying asset, such as equity securities, fixed-income securities, commodities, currencies, interest rates, or market indices. In particular, the Fund may use interest rate futures to manage portfolio risk. The Fund’s exposure to derivatives will vary. For purposes of meeting its 80% investment policy, the Fund may include derivatives that have characteristics similar to the securities in which the Fund may directly invest.
 
In addition to considering economic factors such as the effect of interest rates on the Fund’s investments, the portfolio managers apply a “bottom up” approach in choosing investments. This means that the portfolio managers look at income-producing securities one at a time to determine if a security is an attractive investment opportunity and if it is consistent with the Fund’s investment policies.
 
The Fund may lend portfolio securities on a short-term or long-term basis, in an amount equal to up to 1 / 3 of its total assets as determined at the time of the loan origination.
 
PRINCIPAL INVESTMENT RISKS
 
Although the Fund may be less volatile than funds that invest most of their assets in common stocks, the Fund’s returns and yields will vary, and you could lose money.
 
Fixed-Income Securities Risk.  The Fund invests in a variety of fixed-income securities. Typically, the values of fixed-income securities change inversely with prevailing interest rates. Therefore, a fundamental risk of fixed-income securities is interest rate risk, which is the risk that the value of such securities will generally decline as prevailing interest rates rise, which may cause the Fund’s net asset value to likewise decrease. How specific fixed-income securities may react to changes in interest rates will depend on the specific characteristics of each security. Fixed-income securities are also subject to credit risk, prepayment risk, valuation risk, and liquidity risk. Credit risk is the risk that the credit strength of an issuer of a fixed-income security will weaken and/or that the issuer will be unable to make timely principal and interest payments and that the security may go into default. Prepayment risk is the risk that during periods of falling interest rates, certain fixed-income securities with higher interest rates, such as mortgage- and asset-backed securities, may be prepaid by their issuers thereby reducing the amount of interest payments. Valuation risk is the risk that one or more of the fixed-income securities in which the Fund invests are priced differently than the value realized upon such security’s sale. In times of market instability,

 
 
ï  Janus Investment Fund


 

valuation may be more difficult. Liquidity risk is the risk that fixed-income securities may be difficult or impossible to sell at the time that the portfolio managers would like or at the price the portfolio managers believe the security is currently worth.
 
High-Yield/High-Risk Bond Risk.  The Fund may invest without limit in higher-yielding/higher-risk bonds, also known as “junk” bonds. High-yield/high-risk bonds may be more sensitive than other types of bonds to economic changes, political changes, or adverse developments specific to the company that issued the bond, which may adversely affect their value.
 
Bank Loan Risk.  Bank loans are obligations of companies or other entities entered into in connection with recapitalizations, acquisitions, and refinancings. The Fund’s investments in bank loans are generally acquired as a participation interest in, or assignment of, loans originated by a lender or other financial institution. These investments may include institutionally-traded floating and fixed-rate debt securities. Participation interests and assignments involve credit, interest rate, and liquidity risk. In addition, the bank loans underlying these securities often involve borrowers with low credit ratings whose financial conditions are troubled or uncertain, including companies that are highly leveraged or in bankruptcy proceedings.
 
Foreign Exposure Risk.  The Fund may have exposure to foreign markets as a result of its investments in foreign securities, including investments in emerging markets, which can be more volatile than the U.S. markets. As a result, its returns and net asset value may be affected to a large degree by fluctuations in currency exchange rates or political or economic conditions in a particular country. In some foreign markets, there may not be protection against failure by other parties to complete transactions. It may not be possible for the Fund to repatriate capital, dividends, interest, and other income from a particular country or governmental entity. In addition, a market swing in one or more countries or regions where the Fund has invested a significant amount of its assets may have a greater effect on the Fund’s performance than it would in a more geographically diversified portfolio. To the extent the Fund invests in foreign debt securities, such investments are sensitive to changes in interest rates. Additionally, investments in securities of foreign governments involve the risk that a foreign government may not be willing or able to pay interest or repay principal when due. The Fund’s investments in emerging market countries may involve risks greater than, or in addition to, the risks of investing in more developed countries.
 
Portfolio Turnover Risk.  Increased portfolio turnover may result in higher costs, which may have a negative effect on the Fund’s performance. In addition, higher portfolio turnover may result in the acceleration of capital gains and the recognition of greater levels of short-term capital gains, which are taxed at ordinary federal income tax rates when distributed to shareholders.
 
Derivatives Risk.  Derivatives can be highly volatile and involve risks in addition to the risks of the underlying referenced securities. Gains or losses from a derivative investment can be substantially greater than the derivative’s original cost, and can therefore involve leverage. Leverage may cause the Fund to be more volatile than if it had not used leverage. Derivatives can be less liquid than other types of investments and entail the risk that the counterparty will default on its payment obligations.
 
Securities Lending Risk.  The Fund may seek to earn additional income through lending its securities to certain qualified broker-dealers and institutions. There is the risk that when portfolio securities are lent, the securities may not be returned on a timely basis, and the Fund may experience delays and costs in recovering the security or gaining access to the collateral provided to the Fund to collateralize the loan. If the Fund is unable to recover a security on loan, the Fund may use the collateral to purchase replacement securities in the market. There is a risk that the value of the collateral could decrease below the cost of the replacement security by the time the replacement investment is made, resulting in a loss to the Fund.
 
An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
 
PERFORMANCE INFORMATION
 
The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. Class T Shares (formerly named Class J Shares, the initial share class) of the Fund commenced operations with the Fund’s inception. Class A Shares, Class C Shares, Class S Shares, Class I Shares, and Class R Shares of the Fund commenced operations on July 6, 2009. Class N Shares of the Fund commenced operations on May 31, 2012.
 
•  The performance shown for Class T Shares is calculated using the fees and expenses of Class T Shares in effect during the periods shown, net of any applicable fee and expense limitations or waivers.

 
 
ï  Janus High-Yield Fund


 

•  The performance shown for Class A Shares, Class C Shares, Class S Shares, and Class R Shares for periods prior to July 6, 2009, reflects the performance of the Fund’s former Class J Shares, calculated using the fees and expenses of each respective share class, without the effect of any fee and expense limitations or waivers.
•  The performance shown for Class I Shares for periods prior to July 6, 2009, reflects the performance of the Fund’s former Class J Shares, calculated using the fees and expenses of Class J Shares, net of any applicable fee and expense limitations or waivers.
•  The performance shown for Class N Shares for periods prior to May 31, 2012, reflects the performance of the Fund’s Class T Shares, calculated using the fees and expenses of Class T Shares, net of any applicable fee and expense limitations or waivers.
 
If Class A Shares, Class C Shares, Class S Shares, Class I Shares, and Class R Shares of the Fund had been available during periods prior to July 6, 2009, or Class N Shares of the Fund had been available during periods prior to May 31, 2012, the performance shown for each respective share class may have been different. The performance shown for periods following the Fund’s commencement of Class A Shares, Class C Shares, Class S Shares, Class I Shares, Class N Shares, and Class R Shares reflects the fees and expenses of each respective share class, net of any applicable fee and expense limitations or waivers.
 
The bar chart depicts the change in performance from year to year during the periods indicated. The bar chart figures do not include any applicable sales charges that an investor may pay when they buy or sell Class A Shares or Class C Shares of the Fund. If sales charges were included, the returns would be lower. The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index. The index is not actively managed and is not available for direct investment. All figures assume reinvestment of dividends and distributions. For certain periods, the Fund’s performance reflects the effect of expense waivers. Without the effect of these expense waivers, the performance shown would have been lower.
 
The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. Updated performance information is available at janus.com/advisor/mutual-funds or by calling 1-877-335-2687.
 
                                     
                                     
Annual Total Returns for Class T Shares (calendar year-end)
                                     
2003
  2004   2005   2006   2007   2008   2009   2010   2011   2012
16.04%
  9.42%   2.77%   11.10%   1.35%   −19.32%   40.86%   15.72%   3.20%   14.30%
                                     
Best Quarter:   Second Quarter 2009   14.93%          Worst Quarter:   Fourth Quarter 2008   −12.96%
                                     
 
The Fund’s year-to-date return as of the calendar quarter ended September 30, 2013 was 3.54%.
 
                                 
Average Annual Total Returns (periods ended 12/31/12)
      1 Year       5 Years       10 Years       Since
Inception
(12/29/95)
 
Class T Shares
                               
                                 
Return Before Taxes
    14.30%       9.18%       8.59%       8.20%  
                                 
Return After Taxes on Distributions
    11.64%       5.95%       5.65%       4.95%  
                                 
Return After Taxes on Distributions and Sale of Fund Shares (1)
    9.23%       5.85%       5.58%       4.98%  
                                 
Barclays U.S. Corporate High-Yield Bond Index
    15.81%       10.34%       10.62%       7.66%  
(reflects no deduction for expenses, fees, or taxes)
                               
                                 

 
 
ï  Janus Investment Fund


 

                                 
Average Annual Total Returns (periods ended 12/31/12)
      1 Year       5 Years       10 Years       Since
Inception
(12/29/95)
 
                                 
Class A Shares
                               
                                 
Return Before Taxes (2)
    8.65%       8.00%       7.97%       7.84%  
                                 
Barclays U.S. Corporate High-Yield Bond Index
    15.81%       10.34%       10.62%       7.66%  
(reflects no deduction for expenses, fees, or taxes)
                               
                                 
Class C Shares
                               
                                 
Return Before Taxes (3)
    12.25%       8.28%       7.74%       7.38%  
                                 
Barclays U.S. Corporate High-Yield Bond Index
    15.81%       10.34%       10.62%       7.66%  
(reflects no deduction for expenses, fees, or taxes)
                               
                                 
Class S Shares
                               
                                 
Return Before Taxes
    13.88%       8.87%       8.28%       7.92%  
                                 
Barclays U.S. Corporate High-Yield Bond Index
    15.81%       10.34%       10.62%       7.66%  
(reflects no deduction for expenses, fees, or taxes)
                               
                                 
Class I Shares
                               
                                 
Return Before Taxes
    14.37%       9.18%       8.59%       8.20%  
                                 
Barclays U.S. Corporate High-Yield Bond Index
    15.81%       10.34%       10.62%       7.66%  
(reflects no deduction for expenses, fees, or taxes)
                               
                                 
Class N Shares
                               
                                 
Return Before Taxes
    14.30%       9.18%       8.59%       8.20%  
                                 
Barclays U.S. Corporate High-Yield Bond Index
    15.81%       10.34%       10.62%       7.66%  
(reflects no deduction for expenses, fees, or taxes)
                               
                                 
Class R Shares
                               
                                 
Return Before Taxes
    13.69%       8.58%       8.01%       7.65%  
                                 
Barclays U.S. Corporate High-Yield Bond Index
    15.81%       10.34%       10.62%       7.66%  
(reflects no deduction for expenses, fees, or taxes)
                               
                                 
(1)  If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures.
(2)  Calculated assuming maximum permitted sales loads.
(3)  The one year return is calculated to include the contingent deferred sales charge.
 
After-tax returns are calculated using distributions for the Fund’s Class T Shares (formerly named Class J Shares, the initial share class). After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-deferred account, such as a 401(k) plan or an IRA.
 
After-tax returns are only shown for Class T Shares of the Fund. After-tax returns for the other classes of Shares will vary from those shown for Class T Shares due to varying sales charges (as applicable), fees, and expenses among the classes.

 
 
ï  Janus High-Yield Fund


 

MANAGEMENT
 
Investment Adviser:  Janus Capital Management LLC
 
Portfolio Managers: Gibson Smith , Chief Investment Officer Fixed Income of Janus Capital, is Executive Vice President and Co-Portfolio Manager of the Fund, which he has managed or co-managed since 2003. Darrell Watters is Executive Vice President and Co-Portfolio Manager of the Fund, which he has co-managed since July 2008.
 
PURCHASE AND SALE OF FUND SHARES
 
Minimum Investment Requirements *
 
       
Class A Shares, Class C Shares ** , Class S Shares, Class R Shares, and Class T Shares
Non-retirement accounts
  $ 2,500
       
Certain tax-deferred accounts or UGMA/UTMA accounts
  $ 500
       
Class I Shares
       
Institutional investors (investing directly with Janus)
  $ 1,000,000
       
Through an intermediary institution
     
• non-retirement accounts
  $ 2,500
• certain tax-deferred accounts or UGMA/UTMA accounts
  $ 500
       
Class N Shares
       
No minimum investment requirements imposed by the Fund
    None
       
*    Exceptions to these minimums may apply for certain tax-deferred, tax-qualified and retirement plans, and accounts held through certain wrap programs.
**   The maximum purchase in Class C Shares is $500,000 for any single purchase.
 
Purchases, exchanges, and redemptions can generally be made only through institutional channels, such as financial intermediaries and retirement platforms. Class I Shares may be purchased directly by certain institutional investors. You should contact your financial intermediary or refer to your plan documents for information on how to invest in the Fund. Requests must be received in good order by the Fund or its agents (financial intermediary or plan sponsor, if applicable) prior to the close of the regular trading session of the New York Stock Exchange in order to receive that day’s net asset value. For additional information, refer to “Purchases,” “Exchanges,” and/or “Redemptions” in the Prospectus.
 
TAX INFORMATION
 
The Fund’s distributions are taxable, and will be taxed as ordinary income or capital gains, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or an individual retirement account.
 
PAYMENTS TO BROKER-DEALERS AND OTHER FINANCIAL INTERMEDIARIES
 
If you purchase Class A Shares, Class C Shares, Class S Shares, Class I Shares, Class R Shares, or Class T Shares of the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund and its related companies may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment or to recommend one share class over another. Ask your salesperson or visit your financial intermediary’s website for more information.

 
 
ï  Janus Investment Fund


 

     
Before you invest, you may want to review the Fund’s Prospectus, which contains more information about the Fund and its risks. You can find the Fund’s Prospectus and other information about the Fund online at janus.com/reports. You can also get this information at no cost by calling a Janus representative at 1-800-525-3713 or by sending an email request to prospectusorder@janus.com.   [JANUS LOGO]

Summary Prospectus dated October 28, 2013
Janus High-Yield Fund
             
Ticker:
  JNHYX   Class D Shares*    
Class D Shares are closed to certain new investors.
 
INVESTMENT OBJECTIVES
 
Janus High-Yield Fund seeks to obtain high current income. Capital appreciation is a secondary investment objective when consistent with its primary investment objective.
 
FEES AND EXPENSES OF THE FUND
 
This table describes the fees and expenses that you may pay if you buy and hold Shares of the Fund.
 
                 
ANNUAL FUND OPERATING EXPENSES
       
(expenses that you pay each year as a percentage of the value of your investment)       Class D
Management Fees
    0.56%  
Other Expenses
    0.21%  
Total Annual Fund Operating Expenses
    0.77%  
                 
 
EXAMPLE:
The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated, reinvest all dividends and distributions, and then redeem all of your Shares at the end of each period. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
 
                                 
    1 Year   3 Years   5 Years   10 Years
Class D Shares
  $  79     $  246     $  428     $  954  
 
Portfolio Turnover:  The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 93% of the average value of its portfolio.
 
PRINCIPAL INVESTMENT STRATEGIES
 
The Fund pursues its investment objectives by investing, under normal circumstances, at least 80% of its net assets in high-yield/high-risk securities rated below investment grade. Securities rated below investment grade may include their unrated equivalents or other high-yielding securities the portfolio managers believe offer attractive risk/return characteristics. The Fund may at times invest all of its assets in such securities. The Fund may also invest in bank loans, money market instruments, and foreign debt securities (which may include investments in emerging markets). Due to the nature of securities in which the Fund invests, it may have relatively high portfolio turnover compared to other funds.
 
In addition, the Fund may invest its assets in derivatives, which are instruments that have a value derived from, or directly linked to, an underlying asset, such as equity securities, fixed-income securities, commodities, currencies, interest rates, or market indices. In particular, the Fund may use interest rate futures to manage portfolio risk. The Fund’s exposure to derivatives will vary. For purposes of meeting its 80% investment policy, the Fund may include derivatives that have characteristics similar to the securities in which the Fund may directly invest.
 
In addition to considering economic factors such as the effect of interest rates on the Fund’s investments, the portfolio managers apply a “bottom up” approach in choosing investments. This means that the portfolio managers look at income-producing securities one at a time to determine if a security is an attractive investment opportunity and if it is consistent with the Fund’s investment policies.
 
 
ï  Janus High-Yield Fund


 

The Fund may lend portfolio securities on a short-term or long-term basis, in an amount equal to up to 1 / 3 of its total assets as determined at the time of the loan origination.
 
PRINCIPAL INVESTMENT RISKS
 
Although the Fund may be less volatile than funds that invest most of their assets in common stocks, the Fund’s returns and yields will vary, and you could lose money.
 
Fixed-Income Securities Risk.  The Fund invests in a variety of fixed-income securities. Typically, the values of fixed-income securities change inversely with prevailing interest rates. Therefore, a fundamental risk of fixed-income securities is interest rate risk, which is the risk that the value of such securities will generally decline as prevailing interest rates rise, which may cause the Fund’s net asset value to likewise decrease. How specific fixed-income securities may react to changes in interest rates will depend on the specific characteristics of each security. Fixed-income securities are also subject to credit risk, prepayment risk, valuation risk, and liquidity risk. Credit risk is the risk that the credit strength of an issuer of a fixed-income security will weaken and/or that the issuer will be unable to make timely principal and interest payments and that the security may go into default. Prepayment risk is the risk that during periods of falling interest rates, certain fixed-income securities with higher interest rates, such as mortgage- and asset-backed securities, may be prepaid by their issuers thereby reducing the amount of interest payments. Valuation risk is the risk that one or more of the fixed-income securities in which the Fund invests are priced differently than the value realized upon such security’s sale. In times of market instability, valuation may be more difficult. Liquidity risk is the risk that fixed-income securities may be difficult or impossible to sell at the time that the portfolio managers would like or at the price the portfolio managers believe the security is currently worth.
 
High-Yield/High-Risk Bond Risk.  The Fund may invest without limit in higher-yielding/higher-risk bonds, also known as “junk” bonds. High-yield/high-risk bonds may be more sensitive than other types of bonds to economic changes, political changes, or adverse developments specific to the company that issued the bond, which may adversely affect their value.
 
Bank Loan Risk.  Bank loans are obligations of companies or other entities entered into in connection with recapitalizations, acquisitions, and refinancings. The Fund’s investments in bank loans are generally acquired as a participation interest in, or assignment of, loans originated by a lender or other financial institution. These investments may include institutionally-traded floating and fixed-rate debt securities. Participation interests and assignments involve credit, interest rate, and liquidity risk. In addition, the bank loans underlying these securities often involve borrowers with low credit ratings whose financial conditions are troubled or uncertain, including companies that are highly leveraged or in bankruptcy proceedings.
 
Foreign Exposure Risk.  The Fund may have exposure to foreign markets as a result of its investments in foreign securities, including investments in emerging markets, which can be more volatile than the U.S. markets. As a result, its returns and net asset value may be affected to a large degree by fluctuations in currency exchange rates or political or economic conditions in a particular country. In some foreign markets, there may not be protection against failure by other parties to complete transactions. It may not be possible for the Fund to repatriate capital, dividends, interest, and other income from a particular country or governmental entity. In addition, a market swing in one or more countries or regions where the Fund has invested a significant amount of its assets may have a greater effect on the Fund’s performance than it would in a more geographically diversified portfolio. To the extent the Fund invests in foreign debt securities, such investments are sensitive to changes in interest rates. Additionally, investments in securities of foreign governments involve the risk that a foreign government may not be willing or able to pay interest or repay principal when due. The Fund’s investments in emerging market countries may involve risks greater than, or in addition to, the risks of investing in more developed countries.
 
Portfolio Turnover Risk.  Increased portfolio turnover may result in higher costs, which may have a negative effect on the Fund’s performance. In addition, higher portfolio turnover may result in the acceleration of capital gains and the recognition of greater levels of short-term capital gains, which are taxed at ordinary federal income tax rates when distributed to shareholders.
 
Derivatives Risk.  Derivatives can be highly volatile and involve risks in addition to the risks of the underlying referenced securities. Gains or losses from a derivative investment can be substantially greater than the derivative’s original cost, and can therefore involve leverage. Leverage may cause the Fund to be more volatile than if it had not used leverage. Derivatives can be less liquid than other types of investments and entail the risk that the counterparty will default on its payment obligations.
 
Securities Lending Risk.  The Fund may seek to earn additional income through lending its securities to certain qualified broker-dealers and institutions. There is the risk that when portfolio securities are lent, the securities may not be returned on

 
 
ï  Janus Investment Fund


 

a timely basis, and the Fund may experience delays and costs in recovering the security or gaining access to the collateral provided to the Fund to collateralize the loan. If the Fund is unable to recover a security on loan, the Fund may use the collateral to purchase replacement securities in the market. There is a risk that the value of the collateral could decrease below the cost of the replacement security by the time the replacement investment is made, resulting in a loss to the Fund.
 
An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
 
PERFORMANCE INFORMATION
 
The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. Class D Shares of the Fund commenced operations on February 16, 2010, as a result of the restructuring of Class J Shares, the predecessor share class. The performance shown for Class D Shares for periods prior to February 16, 2010, reflects the performance of the Fund’s former Class J Shares, calculated using the fees and expenses in effect during the periods shown, net of any applicable fee and expense limitations or waivers. If Class D Shares of the Fund had been available during periods prior to February 16, 2010, the performance shown may have been different. The performance shown for periods following the Fund’s commencement of Class D Shares reflects the fees and expenses of Class D Shares, net of any applicable fee and expense limitations or waivers.
 
The bar chart depicts the change in performance from year to year during the periods indicated. The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index. The index is not actively managed and is not available for direct investment. All figures assume reinvestment of dividends and distributions. For certain periods, the Fund’s performance reflects the effect of expense waivers. Without the effect of these expense waivers, the performance shown would have been lower.
 
The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. Updated performance information is available at janus.com/allfunds or by calling 1-800-525-3713.
 
                                     
                                     
Annual Total Returns for Class D Shares (calendar year-end)
                                     
2003
  2004   2005   2006   2007   2008   2009   2010   2011   2012
16.04%
  9.42%   2.77%   11.10%   1.35%   −19.32%   40.86%   15.80%   3.32%   14.40%
                                     
Best Quarter:   Second Quarter 2009   14.93%          Worst Quarter:   Fourth Quarter 2008   −12.96%
                                     
 
The Fund’s year-to-date return as of the calendar quarter ended September 30, 2013 was 3.61%.
 
                                 
                                 
Average Annual Total Returns (periods ended 12/31/12)
                                 
      1 Year       5 Years       10 Years       Since
Inception
(12/29/95)
 
                                 
Class D Shares
                               
                                 
Return Before Taxes
    14.40%       9.24%       8.62%       8.22%  
                                 
Return After Taxes on Distributions
    11.70%       5.99%       5.67%       4.96%  
                                 
Return After Taxes on Distributions and Sale of Fund Shares (1)
    9.30%       5.89%       5.60%       4.99%  
                                 
Barclays U.S. Corporate High-Yield Bond Index
    15.81%       10.34%       10.62%       7.66%  
(reflects no deduction for expenses, fees, or taxes)
                               
                                 

 
 
ï  Janus High-Yield Fund


 

(1)  If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures.
 
After-tax returns are calculated using distributions for the Fund’s Class D Shares for the periods following February 16, 2010; and for the Fund’s Class J Shares, the predecessor share class, for the periods prior to February 16, 2010. If Class D Shares of the Fund had been available during these earlier periods, distributions may have been different and thus, after-tax returns may have been different from those shown. After-tax returns are calculated using the historically highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-deferred account, such as a 401(k) plan or an IRA.
 
MANAGEMENT
 
Investment Adviser:  Janus Capital Management LLC
 
Portfolio Managers: Gibson Smith , Chief Investment Officer Fixed Income of Janus Capital, is Executive Vice President and Co-Portfolio Manager of the Fund, which he has managed or co-managed since 2003. Darrell Watters is Executive Vice President and Co-Portfolio Manager of the Fund, which he has co-managed since July 2008.
 
PURCHASE AND SALE OF FUND SHARES
 
         
Minimum Investment Requirements
To open a new regular Fund account   $ 2,500  
         
To open a new UGMA/UTMA account, Coverdell Education Savings Account, or a retirement Fund account        
• without an automatic investment program
  $ 1,000  
• with an automatic investment program of $50 per month
  $ 500  
         
To add to any existing type of Fund account without an automatic investment program   $ 100  
         
To add to any existing type of Fund account with an automatic investment program   $ 50  
         
 
You may generally purchase, exchange, or redeem Fund Shares on any business day by written request, wire transfer, telephone, and in most cases, online at janus.com/individual. You may conduct transactions by mail (Janus, P.O. Box 55932, Boston, MA 02205-5932), or by telephone at 1-800-525-3713. Purchase, exchange, or redemption requests must be received in good order by the Fund or its agents prior to the close of the regular trading session of the New York Stock Exchange in order to receive that day’s net asset value. For additional information, refer to “To Open an Account or Buy Shares,” “To Exchange Shares,” and/or “To Sell Shares” in the Prospectus.
 
TAX INFORMATION
 
The Fund’s distributions are taxable, and will be taxed as ordinary income or capital gains, unless you are investing through a tax-deferred arrangement, such as a 401(k) plan or an individual retirement account.
 
PAYMENTS TO BROKER-DEALERS AND OTHER FINANCIAL INTERMEDIARIES
 
With respect to certain other classes of shares, the Fund and its related companies may pay select broker-dealer firms or other financial intermediaries for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing a broker-dealer or other intermediary or a salesperson to recommend the Fund over another investment or to recommend one share class over another.

 
 
ï  Janus Investment Fund
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