Before you invest, you may want to review the Portfolio’s Prospectus, which contains more information about the Portfolio and its risks. You can find the Portfolio’s Prospectus and other information about the Portfolio online at janus.com/variable-insurance. 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 May 1, 2013
As Supplemented May 13, 2013
Janus Portfolio
             
Ticker:
  JAGRX   Institutional Shares    
 
INVESTMENT OBJECTIVE
 
Janus Portfolio seeks long-term growth of capital.
 
FEES AND EXPENSES OF THE PORTFOLIO
 
This table describes the fees and expenses that you may pay if you buy and hold Shares of the Portfolio. Owners of variable insurance contracts that invest in the Shares should refer to the variable insurance contract prospectus for a description of fees and expenses, as the following table and examples do not reflect deductions at the separate account level or contract level for any charges that may be incurred under a contract. Inclusion of these charges would increase the fees and expenses described below.
 
                 
ANNUAL FUND OPERATING EXPENSES
(expenses that you pay each year as a percentage of the value of your investment)
       
                 
Management Fees (may adjust up or down)
            0.48%  
Other Expenses
            0.05%  
Total Annual Fund Operating Expenses
            0.53%  
                 
 
EXAMPLE:
The Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Portfolio 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 Portfolio’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
Institutional Shares
  $  54     $  170     $  296     $  665  
 
Portfolio Turnover:  The Portfolio 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. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s turnover rate was 38% of the average value of its portfolio.
 
PRINCIPAL INVESTMENT STRATEGIES
 
The Portfolio pursues its investment objective by investing primarily in common stocks selected for their growth potential. Although the Portfolio may invest in companies of any size, it generally invests in larger, more established companies. As of December 31, 2012, the Portfolio’s weighted average market capitalization was $77.6 billion. The Portfolio may also invest in foreign equity and debt securities, which may include investments in emerging markets.
 
The portfolio managers apply a “bottom up” approach in choosing investments. In other words, the portfolio managers look at companies one at a time to determine if a company is an attractive investment opportunity and if it is consistent with the Portfolio’s investment policies.
 
The Portfolio 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, as substitutes for securities in which the Portfolio invests. The Portfolio may invest in derivative instruments (by taking long and/or short positions) for different purposes, including hedging (to offset risks associated with an investment, currency exposure, or market conditions), as a substitute for securities in which the Portfolio invests, and to earn income and enhance returns.
 
 
ï  Janus Portfolio


 

PRINCIPAL INVESTMENT RISKS
 
The biggest risk is that the Portfolio’s returns will vary, and you could lose money. The Portfolio is designed for long-term investors seeking an equity portfolio, including common stocks. Common stocks tend to be more volatile than many other investment choices.
 
Market Risk.  The value of the Portfolio’s holdings may decrease if the value of an individual company or security, or multiple companies or securities, in the Portfolio decreases or if the portfolio managers’ belief about a company’s intrinsic worth is incorrect. Further, regardless of how well individual companies or securities perform, the value of the Portfolio’s holdings could also decrease if there are deteriorating economic or market conditions. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.
 
Growth Securities Risk.  The Portfolio invests in companies after assessing their growth potential. Securities of companies perceived to be “growth” companies may be more volatile than other stocks and may involve special risks. If the portfolio managers’ perception of a company’s growth potential is not realized, the securities purchased may not perform as expected, reducing the Portfolio’s returns. In addition, because different types of stocks tend to shift in and out of favor depending on market and economic conditions, “growth” stocks may perform differently from the market as a whole and other types of securities.
 
Foreign Exposure Risk.  The Portfolio may have significant 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 Portfolio 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 Portfolio has invested a significant amount of its assets may have a greater effect on the Portfolio’s performance than it would in a more geographically diversified portfolio. To the extent the Portfolio 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 Portfolio’s investments in emerging market countries may involve risks greater than, or in addition to, the risks of investing in more developed countries.
 
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 can be substantially greater than the derivative’s original cost, and can therefore involve leverage. Derivatives can be less liquid than other types of investments and entail the risk that the counterparty will default on its payment obligations.
 
An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

 
 
ï  Janus Aspen Series


 

PERFORMANCE INFORMATION
 
The following information provides some indication of the risks of investing in the Portfolio by showing how the Portfolio’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated, but does not include charges or expenses attributable to any insurance product, which would lower the performance illustrated. The Portfolio does not impose any sales or other charges that would affect total return computations. Total return figures include the effect of the Portfolio’s expenses. The table compares the average annual returns for the Institutional Shares of the Portfolio for the periods indicated to broad-based securities market indices. The indices are not actively managed and are not available for direct investment. All figures assume reinvestment of dividends and distributions.
 
The Portfolio’s past performance does not necessarily indicate how it will perform in the future. Updated performance information is available at janus.com/variable-insurance or by calling 1-877-335-2687.
 
                                     
                                     
Annual Total Returns for Institutional Shares (calendar year-end)
                                     
2003
  2004   2005   2006   2007   2008   2009   2010   2011   2012
31.73%
  4.57%   4.23%   11.38%   15.09%   −39.72%   36.35%   14.52%   −5.30%   18.59%
                                     
Best Quarter:   First Quarter 2012   16.55%          Worst Quarter:   Fourth Quarter 2008   −22.06%
                                     
 
                                 
                                 
Average Annual Total Returns (periods ended 12/31/12)
                                 
      1 Year       5 Years       10 Years       Since
Inception
(9/13/93)
 
                                 
Janus Portfolio
                               
                                 
Institutional Shares
    18.59%       1.12%       6.88%       6.89%  
                                 
Russell 1000 ® Growth Index
    15.26%       3.12%       7.52%       7.45%  
(reflects no deduction for fees, expenses, or taxes)
                               
                                 
S&P 500 ® Index
    16.00%       1.66%       7.10%       8.09%  
(reflects no deduction for fees, expenses, or taxes)
                               
                                 
Core Growth Index
    15.64%       2.41%       7.33%       7.81%  
(reflects no deduction for fees, expenses, or taxes)
                               
                                 
 
The Core Growth Index is an internally-calculated, hypothetical combination of unmanaged indices that combines total returns from the Russell 1000 ® Growth Index (50%) and the S&P 500 ® Index (50%). This index is used to calculate the performance fee adjustment.

 
 
ï  Janus Portfolio


 

MANAGEMENT
 
Investment Adviser:  Janus Capital Management LLC
 
Portfolio Manager: Burton H. Wilson , Janus Capital’s Assistant Director of Equity Research, is Executive Vice President and Portfolio Manager of the Portfolio, which he has managed or co-managed since May 2011.
 
PURCHASE AND SALE OF PORTFOLIO SHARES
 
Purchases of Shares may be made only by the separate accounts of insurance companies for the purpose of funding variable insurance contracts or by certain qualified retirement plans. Redemptions, like purchases, may be effected only through the separate accounts of participating insurance companies or through qualified retirement plans. Requests are duly processed at the NAV next calculated after your order is received in good order by the Portfolio or its agents. Refer to the appropriate separate account prospectus or plan documents for details.
 
TAX INFORMATION
 
Because Shares of the Portfolio may be purchased only through variable insurance contracts and certain qualified retirement plans, it is anticipated that any income dividends or net capital gains distributions made by the Portfolio will be exempt from current federal income taxation if left to accumulate within the variable insurance contract or qualified retirement plan. The federal income tax status of your investment depends on the features of your qualified retirement plan or variable insurance contract.
 
PAYMENTS TO INSURERS, BROKER-DEALERS, AND OTHER FINANCIAL INTERMEDIARIES
 
Portfolio shares are generally available only through an insurer’s variable contracts, or through certain employer or other retirement plans (Retirement Products). Retirement Products are generally purchased through a broker-dealer or other financial intermediary. The Portfolio or its distributor (and/or their related companies) may make payments to the insurer and/or its related companies for distribution and/or other services; some of the payments may go to broker-dealers and other financial intermediaries. These payments may create a conflict of interest for an intermediary, or be a factor in the insurer’s decision to include the Portfolio as an underlying investment option in a variable contract. Ask your financial advisor, visit your intermediary’s website, or consult your insurance contract prospectus for more information.

 
 
ï  Janus Aspen Series


 

     
Before you invest, you may want to review the Portfolio’s Prospectus, which contains more information about the Portfolio and its risks. You can find the Portfolio’s Prospectus and other information about the Portfolio online at janus.com/variable-insurance. 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 May 1, 2013
As Supplemented May 13, 2013
Janus Portfolio
             
Ticker:
  N/A   Service Shares    
 
INVESTMENT OBJECTIVE
 
Janus Portfolio seeks long-term growth of capital.
 
FEES AND EXPENSES OF THE PORTFOLIO
 
This table describes the fees and expenses that you may pay if you buy and hold Shares of the Portfolio. Owners of variable insurance contracts that invest in the Shares should refer to the variable insurance contract prospectus for a description of fees and expenses, as the following table and examples do not reflect deductions at the separate account level or contract level for any charges that may be incurred under a contract. Inclusion of these charges would increase the fees and expenses described below.
 
                 
ANNUAL FUND OPERATING EXPENSES
(expenses that you pay each year as a percentage of the value of your investment)
       
                 
Management Fees (may adjust up or down)
            0.48%  
Distribution/Service (12b-1) Fees
            0.25%  
Other Expenses
            0.05%  
Total Annual Fund Operating Expenses
            0.78%  
                 
 
EXAMPLE:
The Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Portfolio 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 Portfolio’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
Service Shares
  $  80     $  249     $  433     $  966  
 
Portfolio Turnover:  The Portfolio 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. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s turnover rate was 38% of the average value of its portfolio.
 
PRINCIPAL INVESTMENT STRATEGIES
 
The Portfolio pursues its investment objective by investing primarily in common stocks selected for their growth potential. Although the Portfolio may invest in companies of any size, it generally invests in larger, more established companies. As of December 31, 2012, the Portfolio’s weighted average market capitalization was $77.6 billion. The Portfolio may also invest in foreign equity and debt securities, which may include investments in emerging markets.
 
The portfolio managers apply a “bottom up” approach in choosing investments. In other words, the portfolio managers look at companies one at a time to determine if a company is an attractive investment opportunity and if it is consistent with the Portfolio’s investment policies.
 
The Portfolio 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, as substitutes for securities in which the Portfolio invests. The Portfolio may invest in derivative instruments (by taking long and/or short positions) for different purposes, including hedging (to offset risks associated with an investment,
 
 
ï  Janus Portfolio


 

currency exposure, or market conditions), as a substitute for securities in which the Portfolio invests, and to earn income and enhance returns.
 
PRINCIPAL INVESTMENT RISKS
 
The biggest risk is that the Portfolio’s returns will vary, and you could lose money. The Portfolio is designed for long-term investors seeking an equity portfolio, including common stocks. Common stocks tend to be more volatile than many other investment choices.
 
Market Risk.  The value of the Portfolio’s holdings may decrease if the value of an individual company or security, or multiple companies or securities, in the Portfolio decreases or if the portfolio managers’ belief about a company’s intrinsic worth is incorrect. Further, regardless of how well individual companies or securities perform, the value of the Portfolio’s holdings could also decrease if there are deteriorating economic or market conditions. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.
 
Growth Securities Risk.  The Portfolio invests in companies after assessing their growth potential. Securities of companies perceived to be “growth” companies may be more volatile than other stocks and may involve special risks. If the portfolio managers’ perception of a company’s growth potential is not realized, the securities purchased may not perform as expected, reducing the Portfolio’s returns. In addition, because different types of stocks tend to shift in and out of favor depending on market and economic conditions, “growth” stocks may perform differently from the market as a whole and other types of securities.
 
Foreign Exposure Risk.  The Portfolio may have significant 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 Portfolio 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 Portfolio has invested a significant amount of its assets may have a greater effect on the Portfolio’s performance than it would in a more geographically diversified portfolio. To the extent the Portfolio 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 Portfolio’s investments in emerging market countries may involve risks greater than, or in addition to, the risks of investing in more developed countries.
 
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 can be substantially greater than the derivative’s original cost, and can therefore involve leverage. Derivatives can be less liquid than other types of investments and entail the risk that the counterparty will default on its payment obligations.
 
An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

 
 
ï  Janus Aspen Series


 

PERFORMANCE INFORMATION
 
The following information provides some indication of the risks of investing in the Portfolio by showing how the Portfolio’s performance has varied over time. The Portfolio’s Service Shares commenced operations on December 31, 1999. The returns shown for the Service Shares for periods prior to December 31, 1999 reflect the historical performance of a different class of shares (the Institutional Shares), restated based on the Service Shares’ estimated fees and expenses (ignoring any fee and expense limitations). The bar chart depicts the change in performance from year to year during the periods indicated, but does not include charges or expenses attributable to any insurance product, which would lower the performance illustrated. The Portfolio does not impose any sales or other charges that would affect total return computations. Total return figures include the effect of the Portfolio’s expenses. The table compares the average annual returns for the Service Shares of the Portfolio for the periods indicated to broad-based securities market indices. The indices are not actively managed and are not available for direct investment. All figures assume reinvestment of dividends and distributions.
 
The Portfolio’s past performance does not necessarily indicate how it will perform in the future. Updated performance information is available at janus.com/variable-insurance or by calling 1-877-335-2687.
 
                                     
                                     
Annual Total Returns for Service Shares (calendar year-end)
                                     
2003
  2004   2005   2006   2007   2008   2009   2010   2011   2012
31.49%
  4.25%   4.01%   11.13%   14.80%   −39.87%   36.01%   14.26%   −5.54%   18.28%
                                     
Best Quarter:   First Quarter 2012   16.50%          Worst Quarter:   Fourth Quarter 2008   −22.10%
                                     
 
                                 
                                 
Average Annual Total Returns (periods ended 12/31/12)
                                 
      1 Year       5 Years       10 Years       Since
Inception
(9/13/93)
 
                                 
Janus Portfolio
                               
                                 
Service Shares
    18.28%       0.87%       6.62%       6.59%  
                                 
Russell 1000 ® Growth Index
    15.26%       3.12%       7.52%       7.45%  
(reflects no deduction for fees, expenses, or taxes)
                               
                                 
S&P 500 ® Index
    16.00%       1.66%       7.10%       8.09%  
(reflects no deduction for fees, expenses, or taxes)
                               
                                 
Core Growth Index
    15.64%       2.41%       7.33%       7.81%  
(reflects no deduction for fees, expenses, or taxes)
                               
                                 
 
The Core Growth Index is an internally-calculated, hypothetical combination of unmanaged indices that combines total returns from the Russell 1000 ® Growth Index (50%) and the S&P 500 ® Index (50%). This index is used to calculate the performance fee adjustment.

 
 
ï  Janus Portfolio


 

MANAGEMENT
 
Investment Adviser:  Janus Capital Management LLC
 
Portfolio Manager:   Burton H. Wilson , Janus Capital’s Assistant Director of Equity Research, is Executive Vice President and Portfolio Manager of the Portfolio, which he has managed or co-managed since May 2011.
 
PURCHASE AND SALE OF PORTFOLIO SHARES
 
Purchases of Shares may be made only by the separate accounts of insurance companies for the purpose of funding variable insurance contracts or by certain qualified retirement plans. Redemptions, like purchases, may be effected only through the separate accounts of participating insurance companies or through qualified retirement plans. Requests are duly processed at the NAV next calculated after your order is received in good order by the Portfolio or its agents. Refer to the appropriate separate account prospectus or plan documents for details.
 
TAX INFORMATION
 
Because Shares of the Portfolio may be purchased only through variable insurance contracts and certain qualified retirement plans, it is anticipated that any income dividends or net capital gains distributions made by the Portfolio will be exempt from current federal income taxation if left to accumulate within the variable insurance contract or qualified retirement plan. The federal income tax status of your investment depends on the features of your qualified retirement plan or variable insurance contract.
 
PAYMENTS TO INSURERS, BROKER-DEALERS, AND OTHER FINANCIAL INTERMEDIARIES
 
Portfolio shares are generally available only through an insurer’s variable contracts, or through certain employer or other retirement plans (Retirement Products). Retirement Products are generally purchased through a broker-dealer or other financial intermediary. The Portfolio or its distributor (and/or their related companies) may make payments to the insurer and/or its related companies for distribution and/or other services; some of the payments may go to broker-dealers and other financial intermediaries. These payments may create a conflict of interest for an intermediary, or be a factor in the insurer’s decision to include the Portfolio as an underlying investment option in a variable contract. Ask your financial advisor, visit your intermediary’s website, or consult your insurance contract prospectus for more information.

 
 
ï  Janus Aspen Series
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