JANUS ASPEN SERIES
497, 2001-01-12
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<PAGE>



                                  [JANUS LOGO]

                   JANUS ASPEN SERIES
                   SERVICE SHARES

                              PROSPECTUS

                              MAY 1, 2000

                              GROWTH PORTFOLIO
                              CAPITAL APPRECIATION PORTFOLIO
                              BALANCED PORTFOLIO
                              INTERNATIONAL GROWTH PORTFOLIO
                              WORLDWIDE GROWTH PORTFOLIO
                              FLEXIBLE INCOME PORTFOLIO

                   THE SECURITIES AND EXCHANGE COMMISSION HAS NOT APPROVED OR
                   DISAPPROVED OF THESE SECURITIES OR PASSED ON THE ACCURACY OR
                   ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
                   CONTRARY IS A CRIMINAL OFFENSE.
<PAGE>

    [JANUS LOGO]

                This prospectus describes six mutual funds (the "Portfolios")
                with a variety of investment objectives, including growth of
                capital, current income and a combination of growth and income.
                Each Portfolio of Janus Aspen Series currently offers two or
                three classes of shares. The Service Shares, (the "Shares"), are
                offered by this prospectus in connection with investment in and
                payments under variable annuity contracts and variable life
                insurance contracts (collectively, "variable insurance
                contracts"), as well as certain qualified retirement plans.

                Janus Aspen Series sells and redeems its Shares at net asset
                value without sales charges, commissions or redemption fees.
                Each variable insurance contract involves fees and expenses that
                are not described in this Prospectus. Certain Portfolios may not
                be available in connection with a particular contract and
                certain contracts may limit allocations among the Portfolios.
                See the accompanying contract prospectus for information
                regarding contract fees and expenses and any restrictions on
                purchases or allocations.

                This prospectus contains information that a prospective
                purchaser of a variable insurance contract or plan participant
                should consider in conjunction with the accompanying separate
                account prospectus of the specific insurance company product
                before allocating purchase payments or premiums to the
                Portfolios.
<PAGE>
                                                               TABLE OF CONTENTS
<TABLE>
                <S>                                                           <C>
                RISK/RETURN SUMMARY
                   Equity Portfolios........................................    2
                   Flexible Income Portfolio................................    7
                   Fees and expenses........................................    9
                INVESTMENT OBJECTIVES, PRINCIPAL INVESTMENT STRATEGIES AND
                RISKS
                   Equity Portfolios........................................   10
                   Flexible Income Portfolio................................   13
                   General portfolio policies...............................   15
                   Risks for Equity Portfolios..............................   17
                   Risks for Flexible Income Portfolio......................   18
                   Risks Common to all Portfolios...........................   18
                MANAGEMENT OF THE PORTFOLIOS
                   Investment adviser.......................................   20
                   Management expenses and expense limits...................   20
                   Investment personnel.....................................   21
                OTHER INFORMATION...........................................   23
                DISTRIBUTIONS AND TAXES
                   Distributions............................................   25
                   Taxes....................................................   25
                SHAREHOLDER'S GUIDE
                   Pricing of portfolio shares..............................   26
                   Purchases................................................   26
                   Redemptions..............................................   26
                   Frequent trading.........................................   27
                   Shareholder communications...............................   27
                FINANCIAL HIGHLIGHTS........................................   28
                GLOSSARY
                   Glossary of investment terms.............................   29
                RATING CATEGORIES
                   Explanation of rating categories.........................   33

</TABLE>

                                                            Table of contents  1
<PAGE>
RISK RETURN SUMMARY


EQUITY PORTFOLIOS

          The Equity Portfolios are designed for long-term investors who seek
          growth of capital and who can tolerate the greater risks associated
          with common stock investments.

1. WHAT ARE THE INVESTMENT OBJECTIVES OF THE EQUITY PORTFOLIOS?

--------------------------------------------------------------------------------

          DOMESTIC EQUITY PORTFOLIOS

          - GROWTH PORTFOLIO seeks long-term growth of capital in a manner
            consistent with the preservation of capital.

          - CAPITAL APPRECIATION PORTFOLIO seeks long-term growth of capital.

          - BALANCED PORTFOLIO seeks long-term capital growth, consistent
            with preservation of capital and balanced by current income.

          GLOBAL/INTERNATIONAL EQUITY PORTFOLIOS

          - INTERNATIONAL GROWTH PORTFOLIO seeks long-term growth of capital.

          - WORLDWIDE GROWTH PORTFOLIO seeks long-term growth of capital in a
            manner consistent with the preservation of capital.

          The Portfolios' Trustees may change these objectives without a
          shareholder vote and the Portfolios will notify you of any changes
          that are material. If there is a material change to a Portfolio's
          objective or policies, you should consider whether that Portfolio
          remains an appropriate investment for you. There is no guarantee that
          a Portfolio will meet its objective.

2. WHAT ARE THE MAIN INVESTMENT STRATEGIES OF THE EQUITY PORTFOLIOS?

          The portfolio managers apply a "bottom up" approach in choosing
          investments. In other words, they look for companies with earnings
          growth potential one at a time. If a portfolio manager is unable to
          find investments with earnings growth potential, a significant portion
          of a Portfolio's assets may be in cash or similar investments.

          GROWTH PORTFOLIO invests primarily in common stocks selected for their
          growth potential. Although the Portfolio can invest in companies of
          any size, it generally invests in larger, more established companies.

          CAPITAL APPRECIATION PORTFOLIO invests primarily in common stocks
          selected for their growth potential. The Portfolio may invest in
          companies of any size, from larger, well-established companies to
          smaller, emerging growth companies.

          BALANCED PORTFOLIO normally invests 40-60% of its assets in securities
          selected primarily for their growth potential and 40-60% of its assets
          in securities selected primarily for their income potential. The
          Portfolio will normally invest at least 25% of its assets in
          fixed-income securities.

          INTERNATIONAL GROWTH PORTFOLIO normally invests at least 65% of its
          total assets in securities of issuers from at least five different
          countries, excluding the United States. Although the Portfolio intends
          to invest substantially all of its assets in issuers located outside
          the United States, it may invest in U.S. issuers and it may at times
          invest all of its assets in fewer than five countries, or even a
          single country.

 2 Janus Aspen Series
<PAGE>

          WORLDWIDE GROWTH PORTFOLIO invests primarily in common stocks of
          companies of any size throughout the world. The Portfolio normally
          invests in issuers from at least five different countries, including
          the United States. The Portfolio may at times invest in fewer than
          five countries or even a single country.

3. WHAT ARE THE MAIN RISKS OF INVESTING IN THE EQUITY PORTFOLIOS?

          The biggest risk of investing in these Portfolios is that their
          returns may vary, and you could lose money. If you are considering
          investing in any of the Equity Portfolios, remember that they are each
          designed for long-term investors who can accept the risks of investing
          in a portfolio with significant common stock holdings. Common stocks
          tend to be more volatile than other investment choices.

          The value of a Portfolio's holdings may decrease if the value of an
          individual company in the portfolio decreases. The value of a
          Portfolio's holdings could also decrease if the stock market goes
          down. If the value of a Portfolio's holdings decreases, that
          Portfolio's net asset value (NAV) will also decrease, which means if
          you sell your shares in a Portfolio you would get back less money.

          The income component of BALANCED PORTFOLIO includes fixed-income
          securities. A fundamental risk to the income component is that the
          value of these securities will fall if interest rates rise. Generally,
          the value of a fixed-income portfolio will decrease when interest
          rates rise, which means the Portfolio's NAV may likewise decrease.
          Another fundamental risk associated with fixed-income securities is
          credit risk, which is the risk that an issuer of a bond will be unable
          to make principal and interest payments when due.

          INTERNATIONAL GROWTH PORTFOLIO AND WORLDWIDE GROWTH PORTFOLIO may have
          significant exposure to foreign markets. As a result, their returns
          and NAV may be affected to a large degree by fluctuations in currency
          exchange rates or political or economic conditions in a particular
          country.

          CAPITAL APPRECIATION PORTFOLIO is nondiversified. In other words, it
          may hold larger positions in a smaller number of securities than a
          diversified fund. As a result, a single security's increase or
          decrease in value may have a greater impact on the Portfolio's NAV and
          total return.

          An investment in these Portfolios is not a bank deposit and is not
          insured or guaranteed by the Federal Deposit Insurance Corporation or
          any other government agency.

          The following information provides some indication of the risks of
          investing in the Equity Portfolios by showing how each of the Equity
          Portfolios' performance has varied over time. The Portfolios' Service
          Shares commenced operations on December 31, 1999. The returns shown
          for the Service Shares of these Portfolios reflect the historical
          performance of a different class of shares (the Institutional Shares)
          prior to December 31, 1999, restated based on the Service Shares'
          estimated fees and expenses (ignoring any fee and expense
          limitations). The bar charts depict the change in performance from
          year-to-year during the period indicated but do not include charges
          and expenses attributable to any insurance product which would lower
          the performance illustrated. The Portfolios do not impose any sales or
          other charges that would affect total return computations. Total
          return figures include the effect of each Portfolio's expenses. The
          tables compare the average annual returns for the Service Shares of
          each Portfolio for the periods indicated to a broad-based securities
          market index.

                                                          Risk return summary  3
<PAGE>

           GROWTH PORTFOLIO

           Annual returns for periods ended 12/31

                         2.71%   29.96%   18.14%   22.49%   35.59%   43.01%
                         1994    1995     1996     1997     1998     1999

           Best Quarter: 4th-1998  27.71%  Worst Quarter: 3rd-1998 (10.95%)


                          Average annual total return for periods ended 12/31/99
                          ------------------------------------------------------

<TABLE>
<CAPTION>
                                                                                               Since Inception
                                                                          1 year    5 years       (9/13/93)
                <S>                                                   <C>           <C>        <C>
                Growth Portfolio                                          43.01%    29.53%         23.86%
                S&P 500 Index*                                            21.03%    28.54%         22.68%
                                                                      --------------------------------------------
</TABLE>

           * The S&P 500 is the Standard & Poor's Composite Index of 500 Stocks,
             a widely recognized, unmanaged index of common stock prices.

           CAPITAL APPRECIATION PORTFOLIO

           Annual returns for periods ended 12/31

                                                            57.91%   64.60%
                                                            1998     1999

           Best Quarter: 4th-1999  40.00%  Worst Quarter: 3rd-1998 (9.99%)


                          Average annual total return for periods ended 12/31/99
                          ------------------------------------------------------

<TABLE>
<CAPTION>
                                                                                           Since Inception
                                                                                 1 year       (5/1/97)
                <S>                                                          <C>           <C>
                Capital Appreciation Portfolio                                   64.60%        56.39%
                S&P 500 Index*                                                   21.03%        27.40%
                                                                             --------------------------------
</TABLE>

           * The S&P 500 is the Standard & Poor's Composite Index of 500 Stocks,
             a widely recognized, unmanaged index of common stock prices.

 4 Janus Aspen Series
<PAGE>

           BALANCED PORTFOLIO

           Annual returns for periods ended 12/31

                         0.84%   24.79%   16.18%   21.96%   34.03%   26.03%
                         1994    1995     1996     1997     1998     1999

           Best Quarter: 4th-1998  20.26%  Worst Quarter: 3rd-1998 (5.02%)


                          Average annual total return for periods ended 12/31/99
                          ------------------------------------------------------

<TABLE>
<CAPTION>
                                                                                               Since Inception
                                                                          1 year    5 years       (9/13/93)
                <S>                                                       <C>       <C>        <C>
                Balanced Portfolio                                        26.03%    24.55%         20.51%
                S&P 500 Index*                                            21.03%    28.54%         22.68%
                Lehman Brothers Gov't/Corp Bond Index**                   (2.15%)    7.61%          5.40%
                                                                          ------------------------------------
</TABLE>

           * The S&P 500 is the Standard & Poor's Composite Index of 500 Stocks,
             a widely recognized, unmanaged index of common stock prices.

          ** Lehman Brothers Gov't/Corp Bond Index is composed of all bonds that
             are of investment grade with at least one year until maturity.

           INTERNATIONAL GROWTH PORTFOLIO

           Annual returns for periods ended 12/31

                                 23.15%   34.71%   18.36%   16.88%   79.52%
                                 1995     1996     1997     1998     1999

           Best Quarter: 4th-1998  56.24%  Worst Quarter: 3rd-1998 (17.76%)


                          Average annual total return for periods ended 12/31/99
                          ------------------------------------------------------

<TABLE>
<CAPTION>
                                                                                               Since Inception
                                                                          1 year    5 years       (5/2/94)
                <S>                                                       <C>       <C>        <C>
                International Growth Portfolio                            79.52%    33.17%         28.19%
                Morgan Stanley Capital International EAFE(R) Index*       26.96%    12.83%         11.22%
                                                                          ------------------------------------
</TABLE>

           * The Morgan Stanley Capital International EAFE(R) Index is a market
             capitalization weighted index composed of companies representative
             of the market structure of 20 Developed Market countries in Europe,
             Australasia and the Far East.

                                                          Risk return summary  5
<PAGE>

           WORLDWIDE GROWTH PORTFOLIO

           Annual returns for periods ended 12/31

                         1.53%   27.29%   28.80%   21.91%   28.71%   63.49%
                         1994    1995     1996     1997     1998     1999

           Best Quarter: 4th-1999  41.62%  Worst Quarter: 3rd-1998 (17.00%)


                          Average annual total return for periods ended 12/31/99
                          ------------------------------------------------------

<TABLE>
<CAPTION>
                                                                                               Since Inception
                                                                          1 year    5 years       (9/13/93)
                <S>                                                       <C>       <C>        <C>
                Worldwide Growth Portfolio                                63.49%    33.28%         29.35%
                Morgan Stanley Capital International World Index*         24.93%    19.76%         16.41%
                                                                          ------------------------------------
</TABLE>

           * The Morgan Stanley Capital International World Index is a market
             capitalization weighted index composed of companies representative
             of the market structure of 21 Developed Market countries in North
             America, Europe and the Asia/Pacific Region.

          The Equity Portfolios' past performance does not necessarily indicate
          how they will perform in the future.

 6 Janus Aspen Series
<PAGE>

FLEXIBLE INCOME PORTFOLIO

          Flexible Income Portfolio is designed for long-term investors who
          primarily seek current income.

1. WHAT IS THE INVESTMENT OBJECTIVE OF FLEXIBLE INCOME PORTFOLIO?

--------------------------------------------------------------------------------

          - FLEXIBLE INCOME PORTFOLIO seeks to obtain maximum total return,
            consistent with preservation of capital.

          The Trustees may change the objective without a shareholder vote and
          the Portfolio will notify you of any changes that are material. If
          there is a material change to the Portfolio's objective or policies,
          you should consider whether it remains an appropriate investment for
          you. There is no guarantee that the Portfolio will meet its objective.

2. WHAT ARE THE MAIN INVESTMENT STRATEGIES OF FLEXIBLE INCOME PORTFOLIO?

          In addition to considering economic factors such as the effect of
          interest rates on the Portfolio's investments, the portfolio manager
          applies a "bottom up" approach in choosing investments. In other
          words, he looks mostly for income-producing securities that meet their
          investment criteria one at a time. If the portfolio manager is unable
          to find such investments, the Portfolio's assets may be in cash or
          similar investments.

          Flexible Income Portfolio invests primarily in a wide variety of
          income-producing securities such as corporate bonds and notes,
          government securities and preferred stock. As a fundamental policy,
          the Portfolio will invest at least 80% of its assets in
          income-producing securities. The Portfolio may own an unlimited amount
          of high-yield/high-risk bonds, and these securities may be a big part
          of the portfolio.

3. WHAT ARE THE MAIN RISKS OF INVESTING IN FLEXIBLE INCOME PORTFOLIO?

          Although Flexible Income Portfolio may be less volatile than funds
          that invest most of their assets in common stocks, the Portfolio's
          returns and yields will vary, and you could lose money.

          The Portfolio invests in a variety of fixed-income securities. A
          fundamental risk is that the value of these securities will fall if
          interest rates rise. Generally, the value of a fixed-income portfolio
          will decrease when interest rates rise, which means the Portfolio's
          NAV will likewise decrease. Another fundamental risk associated with
          fixed-income funds is credit risk, which is the risk that an issuer
          will be unable to make principal and interest payments when due.

          Flexible Income Portfolio may invest an unlimited amount of its assets
          in high-yield/high-risk bonds, also known as "junk" bonds which may be
          sensitive to economic changes, political changes, or adverse
          developments specific to the company that issued the bond. These bonds
          generally have a greater credit risk than other types of fixed-income
          securities. Because of these factors, the performance and NAV of
          Flexible Income Portfolio may vary significantly, depending upon its
          holdings of junk bonds.

          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.

                                                          Risk return summary  7
<PAGE>

          The following information provides some indication of the risks of
          investing in Flexible Income Portfolio by showing how Flexible Income
          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 of the Portfolio reflects the historical
          performance of a different class of shares (the Institutional Shares)
          prior to December 31, 1999, restated based on the Service Shares'
          estimated fees and expenses on (ignoring any fee and expense
          limitations). The bar chart depicts the change in performance from
          year-to-year during the period indicated but does not include charges
          and 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 a broad-based securities
          market index.

           FLEXIBLE INCOME PORTFOLIO

           Annual returns for periods ended 12/31

                         (0.91%) 23.86%   9.03%    11.52%   8.85%    1.30%
                         1994    1995     1996     1997     1998     1999

           Best Quarter: 2nd-1995  6.71%  Worst Quarter: 2nd-1999 (1.27%)


                          Average annual total return for periods ended 12/31/99
                          ------------------------------------------------------

<TABLE>
<CAPTION>
                                                                                               Since Inception
                                                                          1 year    5 years       (9/13/93)
                <S>                                                       <C>       <C>        <C>
                Flexible Income Portfolio                                  1.30%    10.68%          8.36%
                Lehman Brothers Gov't/Corp Bond Index*                    (2.15%)    7.61%          5.40%
                                                                          ------------------------------------
</TABLE>

           * Lehman Brothers Gov't/Corp Bond Index is composed of all bonds that
             are of investment grade with at least one year until maturity.

          Flexible Income Portfolio's past performance does not necessarily
          indicate how it will perform in the future.

 8 Janus Aspen Series
<PAGE>

FEES AND EXPENSES

          SHAREHOLDER FEES, such as sales loads, redemption fees or exchange
          fees, are charged directly to an investor's account. All Janus funds
          are no-load investments, so you will not pay any shareholder fees when
          you buy or sell shares of the Portfolios. However, each variable
          insurance contract involves fees and expenses not described in this
          prospectus. See the accompanying contract prospectus for information
          regarding contract fees and expenses and any restrictions on purchases
          or allocations.

          ANNUAL FUND OPERATING EXPENSES are paid out of a Portfolio's assets
          and include fees for portfolio management, maintenance of shareholder
          accounts, shareholder servicing, accounting and other services. You do
          not pay these fees directly but, as the example below shows, these
          costs are borne indirectly by all shareholders.

          This table and example are designed to assist participants in
          qualified plans that invest in the Shares of the Portfolios in
          understanding the fees and expenses that you may pay as an investor in
          the Shares. The information shown is based upon estimated gross
          expenses (without the effect of expense offset arrangements) the
          Shares expect to incur in their initial fiscal year. 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 TABLE AND EXAMPLE DO NOT REFLECT DEDUCTIONS AT
          THE SEPARATE ACCOUNT LEVEL OR CONTRACT LEVEL FOR ANY CHARGES THAT MAY
          BE INCURRED UNDER A CONTRACT.
<TABLE>
<CAPTION>
                                                              Distribution                       Total Annual Fund
                                         Management             (12b-1)           Other              Operating
                                            Fee                 Fees(1)         Expenses            Expenses(2)
    <S>                                  <C>                  <C>               <C>              <C>
    Growth Portfolio                        0.65%                 0.25%           0.02%                0.92%
    Capital Appreciation Portfolio          0.65%                 0.25%           0.04%                0.94%
    Balanced Portfolio                      0.65%                 0.25%           0.02%                0.92%
    International Growth Portfolio          0.65%                 0.25%           0.11%                1.01%
    Worldwide Growth Portfolio              0.65%                 0.25%           0.05%                0.95%
    Flexible Income Portfolio               0.65%                 0.25%           0.07%                0.97%
</TABLE>

--------------------------------------------------------------------------------
   (1) Long-term shareholders may pay more than the economic equivalent of
       the maximum front-end sales charges permitted by the National
       Association of Securities Dealers, Inc.

   (2) Expenses are based on the estimated expenses that the new Service
       Shares Class of each Portfolio expects to incur in its initial fiscal
       year. All expenses are shown without the effect of any expense offset
       arrangements.
--------------------------------------------------------------------------------

   EXAMPLE:
   This example is intended to help you compare the cost of investing in
   the Portfolios with the cost of investing in other mutual funds. The
   example assumes that you invest $10,000 in each of the Portfolios for
   the time periods indicated then redeem all of your shares at the end of
   those periods. The example also assumes that your investment has a 5%
   return each year, and that the Portfolios' operating expenses remain the
   same. Although your actual costs may be higher or lower, based on these
   assumptions your costs would be:

<TABLE>
<CAPTION>
                                                                  1 Year     3 Years
                                                                  ------------------
    <S>                                                           <C>        <C>
    Growth Portfolio                                               $ 94      $  293
    Capital Appreciation Portfolio                                 $ 96      $  300
    Balanced Portfolio                                             $ 94      $  293
    International Growth Portfolio                                 $103      $  322
    Worldwide Growth Portfolio                                     $ 97      $  303
    Flexible Income Portfolio                                      $ 99      $  309
</TABLE>

                                                          Risk return summary  9
<PAGE>
INVESTMENT OBJECTIVES, PRINCIPAL INVESTMENT
           STRATEGIES AND RISKS


          Each of the Portfolios has a similar investment objective and similar
          principal investment strategies to a Janus retail fund:

<TABLE>
                  <S>                                              <C>
                  Growth Portfolio                                                 Janus Fund
                  Capital Appreciation Portfolio                            Janus Twenty Fund
                  Balanced Portfolio                                      Janus Balanced Fund
                  International Growth Portfolio                          Janus Overseas Fund
                  Worldwide Growth Portfolio                             Janus Worldwide Fund
                  Flexible Income Portfolio                        Janus Flexible Income Fund
</TABLE>

          Although it is anticipated that each Portfolio and its corresponding
          retail fund will hold similar securities, differences in asset size,
          cash flow needs and other factors may result in differences in
          investment performance. The expenses of each Portfolio and its
          corresponding retail fund are expected to differ. The variable
          contract owner will also bear various insurance related costs at the
          insurance company level. You should review the accompanying separate
          account prospectus for a summary of fees and expenses.

EQUITY PORTFOLIOS

          This section takes a closer look at the investment objectives of each
          of the Equity Portfolios, their principal investment strategies and
          certain risks of investing in the Equity Portfolios. Strategies and
          policies that are noted as "fundamental" cannot be changed without a
          shareholder vote.

          Please carefully review the "Risks" section of this Prospectus on
          pages 17-19 for a discussion of risks associated with certain
          investment techniques. We've also included a Glossary with
          descriptions of investment terms used throughout this Prospectus.

INVESTMENT OBJECTIVES AND PRINCIPAL INVESTMENT STRATEGIES

DOMESTIC EQUITY PORTFOLIOS

          GROWTH PORTFOLIO
          Growth Portfolio seeks long-term growth of capital in a manner
          consistent with the preservation of capital. It pursues its objective
          by investing primarily in common stocks selected for their growth
          potential. Although the Portfolio can invest in companies of any size,
          it generally invests in larger, more established companies.

          CAPITAL APPRECIATION PORTFOLIO
          Capital Appreciation Portfolio seeks long-term growth of capital. It
          pursues its objective by investing primarily in common stocks selected
          for their growth potential. The Portfolio may invest in companies of
          any size, from larger, well-established companies to smaller, emerging
          growth companies.

          BALANCED PORTFOLIO
          Balanced Portfolio seeks long-term capital growth, consistent with
          preservation of capital and balanced by current income. It pursues its
          objective by normally investing 40-60% of its assets in securities
          selected primarily for their growth potential and 40-60% of its assets
          in securities selected primarily for their income potential. This
          Portfolio normally invests at least 25% of its assets in fixed-income
          securities.

 10 Janus Aspen Series
<PAGE>

GLOBAL/INTERNATIONAL EQUITY PORTFOLIOS

          INTERNATIONAL GROWTH PORTFOLIO
          International Growth Portfolio seeks long-term growth of capital.
          Normally, the Portfolio pursues its objective by investing at least
          65% of its total assets in securities of issuers from at least five
          different countries, excluding the United States. Although the
          Portfolio intends to invest substantially all of its assets in issuers
          located outside the United States, it may at times invest in U.S.
          issuers and it may at times invest all of its assets in fewer than
          five countries or even a single country.

          WORLDWIDE GROWTH PORTFOLIO
          Worldwide Growth Portfolio seeks long-term growth of capital in a
          manner consistent with the preservation of capital. It pursues its
          objective by investing primarily in common stocks of companies of any
          size throughout the world. The Portfolio normally invests in issuers
          from at least five different countries, including the United States.
          The Portfolio may at times invest in fewer than five countries or even
          a single country.

The following questions and answers are designed to help you better understand
the Equity Portfolios' principal investment strategies.

1. HOW ARE COMMON STOCKS SELECTED?

          Each of the Portfolios may invest substantially all of its assets in
          common stocks if its portfolio manager believes that common stocks
          will appreciate in value. The portfolio managers generally take a
          "bottom up" approach to selecting companies. In other words, they seek
          to identify individual companies with earnings growth potential that
          may not be recognized by the market at large. They make this
          assessment by looking at companies one at a time, regardless of size,
          country of organization, place of principal business activity, or
          other similar selection criteria. Except for Balanced Portfolio,
          realization of income is not a significant consideration when choosing
          investments for the Portfolios. Income realized on the Portfolios'
          investments may be incidental to their objectives. In the case of
          Balanced Portfolio, the portfolio manager may consider dividend-paying
          characteristics to a greater degree in selecting common stock.

2. ARE THE SAME CRITERIA USED TO SELECT FOREIGN SECURITIES?

          Generally, yes. The portfolio managers seek companies that meet their
          selection criteria, regardless of where a company is located. Foreign
          securities are generally selected on a stock-by-stock basis without
          regard to any defined allocation among countries or geographic
          regions. However, certain factors such as expected levels of
          inflation, government policies influencing business conditions, the
          outlook for currency relationships, and prospects for economic growth
          among countries, regions or geographic areas may warrant greater
          consideration in selecting foreign securities. There are no
          limitations on the countries in which the Portfolios may invest and
          the Portfolios may at times have significant foreign exposure.

3. WHAT DOES "MARKET CAPITALIZATION" MEAN?

          Market capitalization is the most commonly used measure of the size
          and value of a company. It is computed by multiplying the current
          market price of a share of the company's stock by the total number of
          its shares outstanding. Although the Equity Portfolios offered by this
          Prospectus do not emphasize companies of any particular size,
          Portfolios with a larger asset base are more likely to invest in
          larger, more established issuers.

            Investment objectives, principal investment strategies and risks  11
<PAGE>

4. HOW ARE ASSETS ALLOCATED BETWEEN THE GROWTH AND INCOME COMPONENTS OF BALANCED
   PORTFOLIO'S HOLDINGS?

          Balanced Portfolio shifts assets between the growth and income
          components of its holdings based on the portfolio manager's analysis
          of relevant market, financial and economic conditions. If the
          portfolio manager believes that growth securities will provide better
          returns than the yields then available or expected on income-producing
          securities, the Portfolio will place a greater emphasis on the growth
          component.

5. WHAT TYPES OF SECURITIES MAKE UP THE GROWTH COMPONENT OF THE BALANCED
   PORTFOLIO'S INVESTMENTS?

          The growth component of Balanced Portfolio is expected to consist
          primarily of common stocks, but may also include warrants, preferred
          stocks or convertible securities selected primarily for their growth
          potential.

6. WHAT TYPES OF SECURITIES MAKE UP THE INCOME COMPONENT OF BALANCED PORTFOLIO'S
   HOLDINGS?

          The income component of Balanced Portfolio is expected to consist of
          securities that the portfolio manager believes have income potential.
          Such securities may include equity securities, convertible securities
          and all types of debt securities. Equity securities may be included in
          the income component of the Portfolio if they currently pay dividends
          or the portfolio manager believes they have the potential for either
          increasing their dividends or commencing dividends, if none are
          currently paid.

 12 Janus Aspen Series
<PAGE>

FLEXIBLE INCOME PORTFOLIO

          This section takes a closer look at the investment objective of
          Flexible Income Portfolio, its principal investment strategies and
          certain risks of investing in the Portfolio. Strategies and policies
          that are noted as "fundamental" cannot be changed without a
          shareholder vote.

          Please carefully review the "Risks" section of this Prospectus on
          pages 18-19 for a discussion of risks associated with certain
          investment techniques. We've also included a Glossary with
          descriptions of investment terms used throughout this Prospectus.

INVESTMENT OBJECTIVE AND PRINCIPAL INVESTMENT STRATEGIES

          In addition to considering economic factors such as the effect of
          interest rates on the Portfolio's investments, the portfolio manager
          applies a "bottom up" approach in choosing investments. In other
          words, he looks mostly for income-producing securities that meet his
          investment criteria one at a time. If the portfolio manager is unable
          to find such investments, much of the Portfolio's assets may be in
          cash or similar investments.

          Flexible Income Portfolio seeks to obtain maximum total return,
          consistent with preservation of capital. It pursues its objective by
          primarily investing in a wide variety of income-producing securities
          such as corporate bonds and notes, government securities and preferred
          stock. As a fundamental policy, the Portfolio will invest at least 80%
          of its assets in income-producing securities. The Portfolio may own an
          unlimited amount of high-yield/high-risk bonds, and these may be a big
          part of the portfolio. This Portfolio generates total return from a
          combination of current income and capital appreciation, but income is
          usually the dominant portion.

The following questions and answers are designed to help you better understand
Flexible Income Portfolio's principal investment strategies.

1. HOW DO INTEREST RATES AFFECT THE VALUE OF MY INVESTMENT?

          Generally, a fixed-income security will increase in value when
          interest rates fall and decrease in value when interest rates rise.
          Longer-term securities are generally more sensitive to interest rate
          changes than shorter-term securities, but they generally offer higher
          yields to compensate investors for the associated risks. High-yield
          bond prices are generally less directly responsive to interest rate
          changes than investment grade issues and may not always follow this
          pattern. A bond fund's average-weighted effective maturity and its
          duration are measures of how the fund may react to interest rate
          changes.

2. HOW DOES FLEXIBLE INCOME PORTFOLIO MANAGE INTEREST RATE RISK?

          Flexible Income Portfolio may vary the average-weighted effective
          maturity of its assets to reflect its portfolio manager's analysis of
          interest rate trends and other factors. The Portfolio's
          average-weighted effective maturity will tend to be shorter when the
          portfolio manager expects interest rates to rise and longer when the
          portfolio manager expects interest rates to fall. The Portfolio may
          also use futures, options and other derivatives to manage interest
          rate risks.

3. WHAT IS MEANT BY THE PORTFOLIO'S "AVERAGE-WEIGHTED EFFECTIVE MATURITY"?

          The stated maturity of a bond is the date when the issuer must repay
          the bond's entire principal value to an investor. Some types of bonds
          may also have an "effective maturity" that is shorter than the stated
          date due to prepayment or call provisions. Securities without
          prepayment or call provisions generally have an effective maturity
          equal to their stated maturity. Dollar-weighted effective maturity is
          calculated by

            Investment objectives, principal investment strategies and risks  13
<PAGE>

          averaging the effective maturity of bonds held by the Portfolio with
          each effective maturity "weighted" according to the percentage of net
          assets that it represents.

4. WHAT IS MEANT BY THE PORTFOLIO'S "DURATION"?

          A bond's duration indicates the time it will take an investor to
          recoup his investment. Unlike average maturity, duration reflects both
          principal and interest payments. Generally, the higher the coupon rate
          on a bond, the lower its duration will be. The duration of a bond
          portfolio is calculated by averaging the duration of bonds held by a
          fund with each duration "weighted" according to the percentage of net
          assets that it represents. Because duration accounts for interest
          payments, the Portfolio's duration is usually shorter than its average
          maturity.

5. WHAT IS A HIGH-YIELD/HIGH-RISK BOND?

          A high-yield/high-risk bond (also called a "junk" bond) is a bond
          rated below investment grade by major rating agencies (i.e., BB or
          lower by Standard & Poor's or Ba or lower by Moody's) or an unrated
          bond of similar quality. It presents greater risk of default (the
          failure to make timely interest and principal payments) than higher
          quality bonds.

 14 Janus Aspen Series
<PAGE>

GENERAL PORTFOLIO POLICIES

          Unless otherwise stated, each of the following policies applies to all
          of the Portfolios. The percentage limitations included in these
          policies and elsewhere in this Prospectus apply at the time of
          purchase of the security. So, for example, if a Portfolio exceeds a
          limit as a result of market fluctuations or the sale of other
          securities, it will not be required to dispose of any securities.

          CASH POSITION
          When a portfolio manager believes that market conditions are
          unfavorable for profitable investing, or when he or she is otherwise
          unable to locate attractive investment opportunities, the Portfolios'
          cash or similar investments may increase. In other words, the
          Portfolios do not always stay fully invested in stocks and bonds. Cash
          or similar investments generally are a residual - they represent the
          assets that remain after a portfolio manager has committed available
          assets to desirable investment opportunities. However, a portfolio
          manager may also temporarily increase a Portfolio's cash position to
          protect its assets or maintain liquidity. Partly because the portfolio
          managers act independently of each other, the cash positions of the
          Portfolios may vary significantly.

          When a Portfolio's investments in cash or similar investments
          increase, it may not participate in market advances or declines to the
          same extent that it would if the Portfolio remained more fully
          invested in stocks or bonds.

          OTHER TYPES OF INVESTMENTS
          The Equity Portfolios invest primarily in domestic and foreign equity
          securities, which may include preferred stocks, common stocks,
          warrants and securities convertible into common or preferred stocks.
          The Equity Portfolios also invest in domestic and foreign equity
          securities with varying degrees of emphasis on income. The Portfolios
          may also invest to a lesser degree in other types of securities. These
          securities (which are described in the Glossary) may include:

          - debt securities

          - indexed/structured securities

          - high-yield/high-risk bonds (less than 35% of each Portfolio's
            assets)

          - options, futures, forwards, swaps and other types of derivatives for
            hedging purposes or for non-hedging purposes such as seeking to
            enhance return

          - securities purchased on a when-issued, delayed delivery or forward
            commitment basis

          Flexible Income Portfolio invests primarily in fixed-income securities
          which may include corporate bonds and notes, government securities,
          preferred stock, high-yield/high-risk fixed-income securities and
          municipal obligations. The Portfolio may also invest to a lesser
          degree in other types of securities. These securities (which are
          described in the Glossary) may include:

          - common stocks

          - mortgage- and asset-backed securities

          - zero coupon, pay-in-kind and step coupon securities

          - options, futures, forwards, swaps and other types of derivatives for
            hedging purposes or for non-hedging purposes such as seeking to
            enhance return

          - securities purchased on a when-issued, delayed delivery or forward
            commitment basis

            Investment objectives, principal investment strategies and risks  15
<PAGE>

          ILLIQUID INVESTMENTS
          Each Portfolio may invest up to 15% of its net assets in illiquid
          investments. An illiquid investment is a security or other position
          that cannot be disposed of quickly in the normal course of business.
          For example, some securities are not registered under U.S. securities
          laws and cannot be sold to the U.S. public because of SEC regulations
          (these are known as "restricted securities"). Under procedures adopted
          by the Portfolios' Trustees, certain restricted securities may be
          deemed liquid, and will not be counted toward this 15% limit.

          FOREIGN SECURITIES
          The Portfolios may invest without limit in foreign equity and debt
          securities. The Portfolios may invest directly in foreign securities
          denominated in a foreign currency and not publicly traded in the
          United States. Other ways of investing in foreign securities include
          depositary receipts or shares, and passive foreign investment
          companies.

          SPECIAL SITUATIONS
          Each Portfolio may invest in special situations. A special situation
          arises when, in the opinion of a Portfolio's manager, the securities
          of a particular issuer will be recognized and appreciate in value due
          to a specific development with respect to that issuer. Developments
          creating a special situation might include, among others, a new
          product or process, a technological breakthrough, a management change
          or other extraordinary corporate event, or differences in market
          supply of and demand for the security. A Portfolio's performance could
          suffer if the anticipated development in a "special situation"
          investment does not occur or does not attract the expected attention.

          PORTFOLIO TURNOVER
          The Portfolios generally intend to purchase securities for long-term
          investment although, to a limited extent, a Portfolio may purchase
          securities in anticipation of relatively short-term price gains.
          Short-term transactions may also result from liquidity needs,
          securities having reached a price or yield objective, changes in
          interest rates or the credit standing of an issuer, or by reason of
          economic or other developments not foreseen at the time of the
          investment decision. A Portfolio may also sell one security and
          simultaneously purchase the same or a comparable security to take
          advantage of short-term differentials in bond yields or securities
          prices. Changes are made in a Portfolio's holdings whenever its
          portfolio manager believes such changes are desirable. Portfolio
          turnover rates are generally not a factor in making buy and sell
          decisions.

          Increased portfolio turnover may result in higher costs for brokerage
          commissions, dealer mark-ups and other transaction costs and may also
          result in taxable capital gains. Higher costs associated with
          increased portfolio turnover may offset gains in a Portfolio's
          performance.

 16 Janus Aspen Series
<PAGE>

RISKS FOR EQUITY PORTFOLIOS

          Because the Portfolios may invest substantially all of their assets in
          common stocks, the main risk is the risk that the value of the stocks
          they hold might decrease in response to the activities of an
          individual company or in response to general market and/or economic
          conditions. If this occurs, a Portfolio's share price may also
          decrease. A Portfolio's performance may also be affected by risks
          specific to certain types of investments, such as foreign securities,
          derivative investments, non-investment grade debt securities, initial
          public offerings (IPOs) or companies with relatively small market
          capitalizations. IPOs and other investment techniques may have a
          magnified performance impact on a portfolio with a small asset base. A
          portfolio may not experience similar performance as its assets grow.

The following questions and answers are designed to help you better understand
some of the risks of investing in the Equity Portfolios.

1. THE PORTFOLIOS MAY INVEST IN SMALLER OR NEWER COMPANIES. DOES THIS CREATE ANY
   SPECIAL RISKS?

          Many attractive investment opportunities may be smaller, start-up
          companies offering emerging products or services. Smaller or newer
          companies may suffer more significant losses as well as realize more
          substantial growth than larger or more established issuers because
          they may lack depth of management, be unable to generate funds
          necessary for growth or potential development, or be developing or
          marketing new products or services for which markets are not yet
          established and may never become established. In addition, such
          companies may be insignificant factors in their industries and may
          become subject to intense competition from larger or more established
          companies. Securities of smaller or newer companies may have more
          limited trading markets than the markets for securities of larger or
          more established issuers, and may be subject to wide price
          fluctuations. Investments in such companies tend to be more volatile
          and somewhat more speculative.

2. HOW DOES THE NONDIVERSIFIED STATUS OF CAPITAL APPRECIATION PORTFOLIO AFFECT
   ITS RISK?

          Diversification is a way to reduce risk by investing in a broad range
          of stocks or other securities. A "nondiversified" portfolio has the
          ability to take larger positions in a smaller number of issuers.
          Because the appreciation or depreciation of a single stock may have a
          greater impact on the NAV of a nondiversified portfolio, its share
          price can be expected to fluctuate more than a comparable diversified
          portfolio. This fluctuation, if significant, may affect the
          performance of the Portfolio.

            Investment objectives, principal investment strategies and risks  17
<PAGE>

RISKS FOR FLEXIBLE INCOME PORTFOLIO

          Because the Portfolio invests substantially all of its assets in
          fixed-income securities, it is subject to risks such as credit or
          default risks, and decreased value due to interest rate increases. The
          Portfolio's performance may also be affected by risks to certain types
          of investments, such as foreign securities, derivative instruments and
          initial public offerings (IPOs). IPOs and other investment techniques
          may have a magnified performance impact on a portfolio with a small
          asset base. A portfolio may not experience similar performance as its
          assets grow.

The following questions and answers are designed to help you better understand
some of the risks of investing in Flexible Income Portfolio.

1. WHAT IS MEANT BY "CREDIT QUALITY" AND WHAT ARE THE RISKS ASSOCIATED WITH IT?

          Credit quality measures the likelihood that the issuer will meet its
          obligations on a bond. One of the fundamental risks associated with
          all fixed-income funds is credit risk, which is the risk that an
          issuer will be unable to make principal and interest payments when
          due. U.S. government securities are generally considered to be the
          safest type of investment in terms of credit risk. Municipal
          obligations generally rank between U.S. government securities and
          corporate debt securities in terms of credit safety. Corporate debt
          securities, particularly those rated below investment grade, present
          the highest credit risk.

2. HOW IS CREDIT QUALITY MEASURED?

          Ratings published by nationally recognized statistical rating agencies
          such as Standard & Poor's Ratings Service and Moody's Investors
          Service, Inc. are widely accepted measures of credit risk. The lower a
          bond issue is rated by an agency, the more credit risk it is
          considered to represent. Lower rated bonds generally pay higher yields
          to compensate investors for the associated risk. Please refer to
          "Explanation of Rating Categories" on pages 33-34 for a description of
          rating categories.

RISKS COMMON TO ALL PORTFOLIOS

The following questions and answers discuss risks that apply to all Portfolios.

1. HOW COULD THE PORTFOLIOS' INVESTMENTS IN FOREIGN SECURITIES AFFECT THEIR
   PERFORMANCE?

          The Portfolios may invest without limit in foreign securities either
          indirectly (e.g., depositary receipts) or directly in foreign markets.
          Investments in foreign securities, including those of foreign
          governments, may involve greater risks than investing in domestic
          securities because the Portfolios' performance may depend on issues
          other than the performance of a particular company. These issues
          include:

          - CURRENCY RISK. As long as a Portfolio holds a foreign security, its
            value will be affected by the value of the local currency relative
            to the U.S. dollar. When a Portfolio sells a foreign denominated
            security, its value may be worth less in U.S. dollars even if the
            security increases in value in its home country. U.S. dollar
            denominated securities of foreign issuers may also be affected by
            currency risk.

          - POLITICAL AND ECONOMIC RISK. Foreign investments may be subject to
            heightened political and economic risks, particularly in emerging
            markets which may have relatively unstable governments, immature
            economic structures, national policies restricting investments by
            foreigners, different legal systems, and economies based on only a
            few industries. In some countries, there is the risk that the
            government may take over the assets or operations of a company or
            that the government may impose taxes or limits on the removal of a
            Portfolio's assets from that country.

 18 Janus Aspen Series
<PAGE>

          - REGULATORY RISK. There may be less government supervision of foreign
            markets. As a result, foreign issuers may not be subject to the
            uniform accounting, auditing and financial reporting standards and
            practices applicable to domestic issuers and there may be less
            publicly available information about foreign issuers.

          - MARKET RISK. Foreign securities markets, particularly those of
            emerging market countries, may be less liquid and more volatile than
            domestic markets. Certain markets may require payment for securities
            before delivery and delays may be encountered in settling securities
            transactions. In some foreign markets, there may not be protection
            against failure by other parties to complete transactions.

          - TRANSACTION COSTS. Costs of buying, selling and holding foreign
            securities, including brokerage, tax and custody costs, may be
            higher than those involved in domestic transactions.

2. ARE THERE SPECIAL RISKS ASSOCIATED WITH INVESTMENTS IN HIGH-YIELD/HIGH-RISK
   BONDS?

          High-yield/high-risk bonds (or "junk" bonds) are bonds rated below
          investment grade by the primary rating agencies such as Standard &
          Poor's and Moody's. The value of lower quality bonds generally is more
          dependent on credit risk, or the ability of the issuer to meet
          interest and principal payments, than investment grade debt bonds.
          Issuers of high-yield bonds may not be as strong financially as those
          issuing bonds with higher credit ratings and are more vulnerable to
          real or perceived economic changes, political changes or adverse
          developments specific to the issuer.

          The junk bond market can experience sudden and sharp price swings.
          Because Flexible Income Portfolio may invest a significant portion of
          its assets in high-yield/high-risk bonds, investors should be willing
          to tolerate a corresponding increase in the risk of significant and
          sudden changes in NAV.

          Please refer to "Explanation of Rating Categories" on pages 33-34 for
          a description of bond rating categories.

3. HOW DO THE PORTFOLIOS TRY TO REDUCE RISK?

          The Portfolios may use futures, options, swaps and other derivative
          instruments to "hedge" or protect their portfolios from adverse
          movements in securities prices and interest rates. The Portfolios may
          also use a variety of currency hedging techniques, including forward
          currency contracts, to manage exchange rate risk. The portfolio
          managers believe the use of these instruments will benefit the
          Portfolios. However, a Portfolio's performance could be worse than if
          the Portfolio had not used such instruments if a portfolio manager's
          judgement proves incorrect. Risks associated with the use of
          derivative instruments are described in the SAI.

            Investment objectives, principal investment strategies and risks  19
<PAGE>
MANAGEMENT OF THE PORTFOLIOS


INVESTMENT ADVISER

          Janus Capital, 100 Fillmore Street, Denver, Colorado 80206-4928, is
          the investment adviser to each of the Portfolios and is responsible
          for the day-to-day management of the investment portfolios and other
          business affairs of the Portfolios.

          Janus Capital began serving as investment adviser to Janus Fund in
          1970 and currently serves as investment adviser to all of the Janus
          retail funds, acts as sub-adviser for a number of private-label mutual
          funds and provides separate account advisory services for
          institutional accounts.

          Janus Capital furnishes continuous advice and recommendations
          concerning each Portfolio's investments. Janus Capital also furnishes
          certain administrative, compliance and accounting services for the
          Portfolios, and may be reimbursed by the Portfolios for its costs in
          providing those services. In addition, Janus Capital employees serve
          as officers of the Trust and Janus Capital provides office space for
          the Portfolios and pays the salaries, fees and expenses of all
          Portfolio officers and those Trustees who are affiliated with Janus
          Capital.

          Participating insurance companies that purchase the Portfolios' Shares
          may perform certain administrative services relating to the Portfolios
          and Janus Capital or the Portfolios may pay those companies for such
          services.

MANAGEMENT EXPENSES AND EXPENSE LIMITS

          Each Portfolio pays Janus Capital a management fee which is calculated
          daily and paid monthly. The advisory agreement with each Portfolio
          spells out the management fee and other expenses that the Portfolios
          must pay. Each of the Portfolios is subject to the following
          management fee schedule (expressed as an annual rate). In addition,
          the Shares of each Portfolio incur expenses not assumed by Janus
          Capital, including the distribution fee, transfer agent and custodian
          fees and expenses, legal and auditing fees, printing and mailing costs
          of sending reports and other information to existing shareholders, and
          independent Trustees' fees and expenses.

<TABLE>
<CAPTION>
                                                          Average Daily
                                                           Net Assets         Annual Rate      Expense Limit
     Fee Schedule                                         of Portfolio       Percentage (%)    Percentage (%)
------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>                  <C>               <C>
     Growth Portfolio                                    All Asset Levels         0.65               N/A
     Capital Appreciation Portfolio
     Balanced Portfolio
     International Growth Portfolio
     Worldwide Growth Portfolio
------------------------------------------------------------------------------------------------------------------
     Flexible Income Portfolio                          First $300 Million        0.65              1.00(1)
                                                        Over $300 Million         0.55
------------------------------------------------------------------------------------------------------------------
</TABLE>

(1) Janus Capital has agreed to limit the Portfolio's expenses as indicated
    until at least the next annual renewal of the advisory agreements. As noted
    in the fee table on page 9, however, the Portfolio's expenses without
    waivers are not expected to exceed the expense limit.

          For the fiscal year ended December 31, 1999, each Portfolio paid Janus
          Capital the following management fees based upon each Portfolio's
          average net assets: 0.67% for Growth Portfolio, 0.75% for Capital
          Appreciation Portfolio, 0.67% for Balanced Portfolio, 0.73% for
          International Growth Portfolio, 0.66% for Worldwide Growth Portfolio
          and 0.65% for Flexible Income Portfolio. These rates were based on a
          higher fee rate that was previously in effect for certain of these
          Portfolios.

 20 Janus Aspen Series
<PAGE>

INVESTMENT PERSONNEL

PORTFOLIO MANAGERS

LAURENCE J. CHANG
--------------------------------------------------------------------------------
            is Executive Vice President and co-manager of International
            Growth Portfolio and Worldwide Growth Portfolio which he has
            co-managed since May 1998 and December 1999, respectively. He has
            also co-managed Janus Overseas Fund and Janus Worldwide Fund
            since April 1998 and September 1999, respectively. He served as
            assistant portfolio manager for these funds since 1996. Mr. Chang
            joined Janus Capital in 1993 as a research analyst. He received
            an undergraduate degree with honors in Religion with a
            concentration in Philosophy from Dartmouth College and a Masters
            Degree in Political Science from Stanford University. He has
            earned the right to use the Chartered Financial Analyst
            designation.

HELEN YOUNG HAYES
--------------------------------------------------------------------------------
            is Executive Vice President and co-manager of International
            Growth Portfolio and Worldwide Growth Portfolio, which she has
            managed or co-managed since inception. Ms. Hayes joined Janus
            Capital in 1987 and has managed or co-managed Janus Worldwide
            Fund and Janus Overseas Fund since their inceptions. She holds a
            Bachelor of Arts in Economics from Yale University and she has
            earned the right to use the Chartered Financial Analyst
            designation.

KAREN L. REIDY
--------------------------------------------------------------------------------
            is Executive Vice President and portfolio manager of Balanced
            Portfolio and Equity Income Portfolio as of January 2000, and an
            assistant portfolio manager of Growth Portfolio since 1998. She
            also manages Janus Balanced Fund and Janus Equity Income Fund as
            of January 2000. She is also assistant portfolio manager of Janus
            Fund. Prior to joining Janus Capital in 1995, she worked for
            Price Waterhouse as a manager in both the Mergers and
            Acquisitions and Audit business units. In this capacity, Ms.
            Reidy performed due diligence work for corporate clients and
            oversaw audit engagements. She received an undergraduate degree
            in Accounting from the University of Colorado in 1989 and passed
            the CPA exam in 1992. She has earned the right to use the
            Chartered Financial Analyst designation.

BLAINE P. ROLLINS
--------------------------------------------------------------------------------
            is Executive Vice President and portfolio manager of Growth
            Portfolio as of January 2000. He previously managed Balanced
            Portfolio from May 1996 to December 1999 and Equity Income
            Portfolio from its inception to December 1999. Mr. Rollins joined
            Janus Capital in 1990 and has managed Janus Fund since January
            2000, Janus Balanced Fund from January 1996 until December 1999
            and Janus Equity Income Fund from inception until December 1999.
            He was an assistant portfolio manager of Janus Fund from January
            1994 until December 1999. He gained experience as a fixed-income
            trader and equity research analyst prior to managing Balanced
            Portfolio. He holds a Bachelor of Science in Finance from the
            University of Colorado and he has earned the right to use the
            Chartered Financial Analyst designation.

                                                Management of the portfolios  21
<PAGE>

SCOTT W. SCHOELZEL
--------------------------------------------------------------------------------
            is Executive Vice President and portfolio manager of Capital
            Appreciation Portfolio, which he has managed since its inception.
            He is portfolio manager of Janus Twenty Fund, which he has
            managed since August 1997. He previously managed Janus Olympus
            Fund from its inception to August 1997. Mr. Schoelzel joined
            Janus Capital in January 1994. He holds a Bachelor of Arts in
            Business from Colorado College.

RONALD V. SPEAKER
--------------------------------------------------------------------------------
            is Executive Vice President and portfolio manager of Flexible
            Income Portfolio which he has managed or co-managed since its
            inception. He previously served as co-manager of High-Yield
            Portfolio, from its inception to May 1998. He managed Short-Term
            Bond Portfolio from its inception through April 1996. Mr. Speaker
            joined Janus Capital in 1986. He has managed or co-managed Janus
            Flexible Income Fund since December 1991 and previously managed
            both Janus Short-Term Bond Fund and Janus Federal Tax-Exempt Fund
            from inception through December 1995. He previously managed or
            co-managed Janus High-Yield Fund from its inception to February
            1998. He holds a Bachelor of Arts in Finance from the University
            of Colorado and he has earned the right to use the Chartered
            Financial Analyst designation.

            In January 1997, Mr. Speaker settled an SEC administrative action
            involving two personal trades made by him in January of 1993.
            Without admitting or denying the allegations, Mr. Speaker agreed
            to civil money penalty, disgorgement, and interest payments
            totaling $37,199 and to a 90-day suspension which ended on April
            25, 1997.

ASSISTANT PORTFOLIO MANAGERS

DAVID C. DECKER
--------------------------------------------------------------------------------
            is an assistant portfolio manager of Growth Portfolio. He is also
            an assistant portfolio manager of Janus Fund. He is Executive
            Vice President and portfolio manager of Strategic Value
            Portfolio, Janus Strategic Value Fund and Janus Special
            Situations Fund, each of which he has managed since its
            inception. He obtained a Masters of Business Administration in
            Finance from the Fuqua School of Business at Duke University and
            a Bachelor of Arts in Economics and Political Science from Tufts
            University. Mr. Decker has earned the right to use the Chartered
            Financial Analyst designation.

JOHN H. SCHREIBER
--------------------------------------------------------------------------------
            is an assistant portfolio manager of Growth Portfolio. Mr.
            Schreiber joined Janus Capital in 1997 as an equity research
            analyst. Prior to coming to Janus he was an equity analyst with
            Fidelity Investments. Mr. Schreiber holds a Bachelor of Science
            degree in mechanical engineering from the University of
            Washington and an MBA from Harvard University.

 22 Janus Aspen Series
<PAGE>
                                                               OTHER INFORMATION

          CLASSES OF SHARES

          Each Portfolio currently offers two or three classes of shares, one of
          which, the Service Shares, are offered pursuant to this prospectus.
          The Shares offered by this prospectus are available only in connection
          with investment in and payments under variable insurance contracts as
          well as certain qualified retirement plans that require a fee from
          Portfolio assets to procure distribution and administrative services
          to contract owners and plan participants. Institutional Shares of each
          Portfolio are available only in connection with investment in and
          payments under variable insurance contracts, as well as certain
          qualified retirement plans. Retirement Shares of certain Portfolios
          are offered only to qualified plans using plan service providers that
          are compensated for providing distribution and/or record keeping and
          other administrative services provided to plan participants. Because
          the expenses of each class may differ, the performance of each class
          is expected to differ. If you would like additional information about
          either the Institutional Shares or the Retirement Shares, please call
          1-800-525-0020.

          During the third quarter of 2000, the Retirement Shares shareholders
          will be asked to approve the spin-off of the Retirement Shares into a
          separate Delaware business trust, Janus Adviser Series. In connection
          with this spin-off, each Portfolio will distribute all of its ordinary
          income and capital gain income earned through the date of the
          spin-off. The distributions will be made for all classes, including
          Service Shares. It is anticipated that the spin-off and distributions
          will occur during the third quarter of 2000.

          DISTRIBUTION FEE

          Under a distribution and service plan adopted in accordance with Rule
          12b-1 under the 1940 Act, the Shares may pay Janus Distributors, Inc.,
          the Trust's distributor, a fee at an annual rate of up to 0.25% of the
          average daily net assets of the Shares of a Portfolio. Under the terms
          of the Plan, the Trust is authorized to make payments to Janus
          Distributors for remittance to insurance companies and qualified plan
          service providers as compensation for distribution and shareholder
          servicing performed by such entities. Because 12b-1 fees are paid out
          of the Service Shares' assets on an ongoing basis, they will increase
          the cost of your investment and may cost you more than paying other
          types of sales charges.

          CONFLICTS OF INTEREST

          The Trust's shares are available only to variable annuity and variable
          life separate accounts of insurance companies that are unaffiliated
          with Janus Capital and to certain qualified retirement plans. Although
          the Portfolios do not currently anticipate any disadvantages to owners
          of variable insurance contracts because each Portfolio offers its
          shares to such entities, there is a possibility that a material
          conflict may arise. The Trustees monitor events in order to identify
          any disadvantages or material irreconcilable conflicts and to
          determine what action, if any, should be taken in response. If a
          material disadvantage or conflict occurs, the Trustees may require one
          or more insurance company separate accounts or qualified plans to
          withdraw its investments in one or more Portfolios or substitute
          Shares of another Portfolio. If this occurs, a Portfolio may be forced
          to sell its securities at disadvantageous prices. In addition, the
          Trustees may refuse to sell Shares of any Portfolio to any separate
          account or qualified plan or may suspend or terminate the offering of
          a Portfolio's Shares if such action is required by law or regulatory
          authority or is in the best interests of that Portfolio's
          shareholders. It is possible that a qualified plan investing in the
          Portfolios could lose its qualified plan status under the Internal
          Revenue Code, which could have adverse tax consequences on insurance
          company separate accounts investing in the Shares. Janus Capital
          intends to monitor such qualified plans and the Portfolios may
          discontinue sales to a qualified plan and require plan participants
          with existing investments in the Shares to redeem those investments if
          a plan loses (or in the opinion of Janus Capital is at risk of losing)
          its qualified plan status.

                                                           Other information  23
<PAGE>

          DISTRIBUTION OF EACH PORTFOLIO

          Each Portfolio is distributed by Janus Distributors, Inc., a member of
          the National Association of Securities Dealers, Inc. ("NASD"). To
          obtain information about NASD member firms and their associated
          persons, you may contact NASD Regulation, Inc. at www.nasdr.com, or
          the Public Disclosure Hotline at 800-289-9999. An investor brochure
          containing information describing the Public Disclosure Program is
          available from NASD Regulation, Inc.

 24 Janus Aspen Series
<PAGE>
                                                         DISTRIBUTIONS AND TAXES


DISTRIBUTIONS

          To avoid taxation of the Portfolios, the Internal Revenue Code
          requires each Portfolio to distribute net income and any net gains
          realized on its investments annually. A Portfolio's income from
          dividends and interest and any net realized short-term gains are paid
          to shareholders as ordinary income dividends. Net realized long-term
          gains are paid to shareholders as capital gains distributions.

          Each class of each Portfolio distributes substantially all of its
          investment income at least semi-annually and its net realized gains,
          if any, at least annually. All dividends and capital gains
          distributions from Shares of a Portfolio will automatically be
          reinvested into additional Shares of that Portfolio.

          HOW DISTRIBUTIONS AFFECT NAV

          Distributions, other than daily income dividends, are paid to
          shareholders as of the record date of the distribution of a Portfolio,
          regardless of how long the shares have been held. Undistributed income
          and realized gains are included in the daily NAV of a Portfolio's
          Shares. The Share price of a Portfolio drops by the amount of the
          distribution, net of any subsequent market fluctuations. For example,
          assume that on December 31, the Shares of Growth Portfolio declared a
          dividend in the amount of $0.25 per share. If the price of Growth
          Portfolio's Shares was $10.00 on December 30, the share price on
          December 31 would be $9.75, barring market fluctuations.

TAXES

          TAXES ON DISTRIBUTIONS

          Because Shares of the Portfolios may be purchased only through
          variable insurance contracts and qualified plans, it is anticipated
          that any income dividends or capital gains distributions made by the
          Shares of a Portfolio will be exempt from current taxation if left to
          accumulate within the variable insurance contract or qualified plan.
          Generally, withdrawals from such contracts or plans may be subject to
          ordinary income tax and, if made before age 59 1/2, a 10% penalty tax.
          The tax status of your investment depends on the features of your
          qualified plan or variable insurance contract. Further information may
          be found in your plan documents or in the prospectus of the separate
          account offering such contract.

          TAXATION OF THE PORTFOLIOS

          Dividends, interest and some gains received by the Portfolios on
          foreign securities may be subject to tax withholding or other foreign
          taxes. The Portfolios may from year to year make the election
          permitted under Section 853 of the Internal Revenue Code to pass
          through such taxes to shareholders as a foreign tax credit. If such
          election is not made, any foreign taxes paid or accrued will represent
          an expense to the Portfolios which will reduce their investment
          income.

          The Portfolios do not expect to pay any federal income or excise taxes
          because they intend to meet certain requirements of the Internal
          Revenue Code. In addition, because a class of shares of each Portfolio
          are sold in connection with variable insurance contracts, each
          Portfolio intends to qualify under the Internal Revenue Code with
          respect to the diversification requirements related to the
          tax-deferred status of insurance company separate accounts.

                                                     Distributions and taxes  25
<PAGE>
SHAREHOLDER'S GUIDE


          INVESTORS MAY NOT PURCHASE OR REDEEM SHARES OF THE PORTFOLIOS
          DIRECTLY. SHARES MAY BE PURCHASED OR REDEEMED ONLY THROUGH VARIABLE
          INSURANCE CONTRACTS OFFERED BY THE SEPARATE ACCOUNTS OF PARTICIPATING
          INSURANCE COMPANIES OR THROUGH QUALIFIED RETIREMENT PLANS. CERTAIN
          PORTFOLIOS MAY NOT BE AVAILABLE IN CONNECTION WITH A PARTICULAR
          CONTRACT AND CERTAIN CONTRACTS MAY LIMIT ALLOCATIONS AMONG THE
          PORTFOLIOS. REFER TO THE PROSPECTUS FOR THE PARTICIPATING INSURANCE
          COMPANY'S SEPARATE ACCOUNT OR YOUR PLAN DOCUMENTS FOR INSTRUCTIONS ON
          PURCHASING OR SELLING OF VARIABLE INSURANCE CONTRACTS AND ON HOW TO
          SELECT SPECIFIC PORTFOLIOS AS INVESTMENT OPTIONS FOR A CONTRACT OR A
          QUALIFIED PLAN.

PRICING OF PORTFOLIO SHARES

          Investments will be processed at the NAV next determined after an
          order is received and accepted by a Portfolio or its agent. In order
          to receive a day's price, your order must be received by the close of
          the regular trading session of the New York Stock Exchange any day
          that the NYSE is open. Securities of the Portfolios are valued at
          market value or, if a market quotation is not readily available, at
          their fair value determined in good faith under procedures established
          by and under the supervision of the Trustees. Short-term instruments
          maturing within 60 days are valued at amortized cost, which
          approximates market value. See the SAI for more detailed information.

          To the extent a Portfolio holds securities that are primarily listed
          on foreign exchanges that trade on weekends or other days when the
          Portfolios do not price their shares, the NAV of a Portfolio's shares
          may change on days when shareholders will not be able to purchase or
          redeem the Portfolio's shares.

PURCHASES

          Purchases of Shares may be made only by the separate accounts of
          insurance companies for the purpose of funding variable insurance
          contracts or by qualified plans. Refer to the prospectus of the
          appropriate insurance company separate account or your plan documents
          for information on how to invest in the Shares of each Portfolio.
          Participating insurance companies and certain other designated
          organizations are authorized to receive purchase orders on the
          Portfolios' behalf.

          The Portfolios do not permit frequent trading or market timing.
          Excessive purchases of Portfolio Shares disrupt portfolio management
          and drive Portfolio expenses higher. Each Portfolio reserves the right
          to reject any specific purchase order. Purchase orders may be refused
          if, in Janus Capital's opinion, they are of a size that would disrupt
          the management of a Portfolio. Although there is no present intention
          to do so, the Portfolios may discontinue sales of their shares if
          management and the Trustees believe that continued sales may adversely
          affect a Portfolio's ability to achieve its investment objective. If
          sales of a Portfolio's Shares are discontinued, it is expected that
          existing participants invested in that Portfolio would be permitted to
          continue to authorize investment in that Portfolio and to reinvest any
          dividends or capital gains distributions, absent highly unusual
          circumstances. The Portfolios may discontinue sales to a qualified
          plan and require plan participants with existing investments in the
          Shares to redeem those investments if the plan loses (or in the
          opinion of Janus Capital, is at risk of losing) its qualified plan
          status.

REDEMPTIONS

          Redemptions, like purchases, may be effected only through the separate
          accounts of participating insurance companies or through qualified
          plans. Please refer to the appropriate separate account prospectus or
          plan documents for details.

 26 Janus Aspen Series
<PAGE>

          Shares of any Portfolio may be redeemed on any business day.
          Redemptions are processed at the NAV next calculated after receipt and
          acceptance of the redemption order by the Portfolio or its agent.
          Redemption proceeds will normally be wired the business day following
          receipt of the redemption order, but in no event later than seven days
          after receipt of such order.

FREQUENT TRADING

          Frequent trading of Portfolio shares in response in short-term
          fluctuations in the market -- also known as "market timing" -- may
          make it very difficult to manage a Portfolio's investments. The
          Portfolios do not permit frequent trading or market timing. When
          market timing occurs, a Portfolio may have to sell portfolio
          securities to have the cash necessary to redeem the market timer's
          shares. This can happen at a time when it is not advantageous to sell
          any securities, which may harm a Portfolio's performance. When large
          dollar amounts are involved, market timing can also make it difficult
          to use long-term investment strategies because the portfolio manager
          cannot predict how much cash a Portfolio will have to invest. When in
          Janus Capital's opinion such activity would have a disruptive effect
          on portfolio management, a Portfolio reserves the right to refuse
          purchase orders and exchanges into a Portfolio by any person, group or
          commonly controlled account. A Portfolio may notify a market timer of
          rejection of a purchase or exchange order after the day the order is
          placed. If a Portfolio allows a market timer to trade Portfolio
          shares, it may require the market timer to enter into a written
          agreement to follow certain procedures and limitations.

SHAREHOLDER COMMUNICATIONS

          Shareholders will receive annual and semiannual reports including the
          financial statements of the Shares of the Portfolios that they have
          authorized for investment. Each report will show the investments owned
          by each Portfolio and the market values thereof, as well as other
          information about the Portfolios and their operations. The Trust's
          fiscal year ends December 31.

                                                         Shareholder's guide  27
<PAGE>
FINANCIAL HIGHLIGHTS


          No Financial Highlights are presented for the Service Shares because
          the Shares did not commence operations until December 31, 1999.

 28 Janus Aspen Series
<PAGE>
                                                    GLOSSARY OF INVESTMENT TERMS


          This glossary provides a more detailed description of some of the
          types of securities and other instruments in which the Portfolios may
          invest. The Portfolios may invest in these instruments to the extent
          permitted by their investment objectives and policies. The Portfolios
          are not limited by this discussion and may invest in any other types
          of instruments not precluded by the policies discussed elsewhere in
          this Prospectus. Please refer to the SAI for a more detailed
          discussion of certain instruments.

I. EQUITY AND DEBT SECURITIES

          BONDS are debt securities issued by a company, municipality,
          government or government agency. The issuer of a bond is required to
          pay the holder the amount of the loan (or par value of the bond) at a
          specified maturity and to make scheduled interest payments.

          COMMERCIAL PAPER is a short-term debt obligation with a maturity
          ranging from 1 to 270 days issued by banks, corporations and other
          borrowers to investors seeking to invest idle cash. The Portfolios may
          purchase commercial paper issued in private placements under Section
          4(2) of the Securities Act of 1933.

          COMMON STOCKS are equity securities representing shares of ownership
          in a company and usually carry voting rights and earns dividends.
          Unlike preferred stock, dividends on common stock are not fixed but
          are declared at the discretion of the issuer's board of directors.

          CONVERTIBLE SECURITIES are preferred stocks or bonds that pay a fixed
          dividend or interest payment and are convertible into common stock at
          a specified price or conversion ratio.

          DEBT SECURITIES are securities representing money borrowed that must
          be repaid at a later date. Such securities have specific maturities
          and usually a specific rate of interest or an original purchase
          discount.

          DEPOSITARY RECEIPTS are receipts for shares of a foreign-based
          corporation that entitle the holder to dividends and capital gains on
          the underlying security. Receipts include those issued by domestic
          banks (American Depositary Receipts), foreign banks (Global or
          European Depositary Receipts) and broker-dealers (depositary shares).

          FIXED-INCOME SECURITIES are securities that pay a specified rate of
          return. The term generally includes short-and long-term government,
          corporate and municipal obligations that pay a specified rate of
          interest or coupons for a specified period of time, and preferred
          stock, which pays fixed dividends. Coupon and dividend rates may be
          fixed for the life of the issue or, in the case of adjustable and
          floating rate securities, for a shorter period.

          HIGH-YIELD/HIGH-RISK BONDS are bonds that are rated below investment
          grade by the primary rating agencies (e.g., BB or lower by Standard &
          Poor's and Ba or lower by Moody's). Other terms commonly used to
          describe such bonds include "lower rated bonds," "noninvestment grade
          bonds" and "junk bonds."

          MORTGAGE- AND ASSET-BACKED SECURITIES are shares in a pool of
          mortgages or other debt. These securities are generally pass-through
          securities, which means that principal and interest payments on the
          underlying securities (less servicing fees) are passed through to
          shareholders on a pro rata basis. These securities involve prepayment
          risk, which is the risk that the underlying mortgages or other debt
          may be refinanced or paid off prior to their maturities during periods
          of declining interest rates. In that case, a portfolio manager may
          have to reinvest the proceeds from the securities at a lower rate.
          Potential market gains on a security subject to prepayment risk may be
          more limited than potential market gains on a comparable security that
          is not subject to prepayment risk.

          PASSIVE FOREIGN INVESTMENT COMPANIES (PFICS) are any foreign
          corporations which generate certain amounts of passive income or hold
          certain amounts of assets for the production of passive income.
          Passive income includes dividends, interest, royalties, rents and
          annuities. To avoid taxes and interest that the

                                                Glossary of investment terms  29
<PAGE>

          Portfolios must pay if these investments are profitable, the
          Portfolios may make various elections permitted by the tax laws. These
          elections could require that the Portfolios recognize taxable income,
          which in turn must be distributed, before the securities are sold and
          before cash is received to pay the distributions.

          PAY-IN-KIND BONDS are debt securities that normally give the issuer an
          option to pay cash at a coupon payment date or give the holder of the
          security a similar bond with the same coupon rate and a face value
          equal to the amount of the coupon payment that would have been made.

          PREFERRED STOCKS are equity securities that generally pay dividends at
          a specified rate and have preference over common stock in the payment
          of dividends and liquidation. Preferred stock generally does not carry
          voting rights.

          REPURCHASE AGREEMENTS involve the purchase of a security by a
          Portfolio and a simultaneous agreement by the seller (generally a bank
          or dealer) to repurchase the security from the Portfolio at a
          specified date or upon demand. This technique offers a method of
          earning income on idle cash. These securities involve the risk that
          the seller will fail to repurchase the security, as agreed. In that
          case, a Portfolio will bear the risk of market value fluctuations
          until the security can be sold and may encounter delays and incur
          costs in liquidating the security.

          REVERSE REPURCHASE AGREEMENTS involve the sale of a security by a
          Portfolio to another party (generally a bank or dealer) in return for
          cash and an agreement by the Portfolio to buy the security back at a
          specified price and time. This technique will be used primarily to
          provide cash to satisfy unusually high redemption requests, or for
          other temporary or emergency purposes.

          RULE 144A SECURITIES are securities that are not registered for sale
          to the general public under the Securities Act of 1933, but that may
          be resold to certain institutional investors.

          STANDBY COMMITMENTS are obligations purchased by a Portfolio from a
          dealer that give the Portfolio the option to sell a security to the
          dealer at a specified price.

          STEP COUPON BONDS are debt securities that trade at a discount from
          their face value and pay coupon interest. The discount from the face
          value depends on the time remaining until cash payments begin,
          prevailing interest rates, liquidity of the security and the perceived
          credit quality of the issuer.

          STRIP BONDS are debt securities that are stripped of their interest
          (usually by a financial intermediary) after the securities are issued.
          The market value of these securities generally fluctuates more in
          response to changes in interest rates than interest-paying securities
          of comparable maturity.

          TENDER OPTION BONDS are generally long-term securities that are
          coupled with an option to tender the securities to a bank,
          broker-dealer or other financial institution at periodic intervals and
          receive the face value of the bond. This type of security is commonly
          used as a means of enhancing the security's liquidity.

          U.S. GOVERNMENT SECURITIES include direct obligations of the U.S.
          government that are supported by its full faith and credit. Treasury
          bills have initial maturities of less than one year, Treasury notes
          have initial maturities of one to ten years and Treasury bonds may be
          issued with any maturity but generally have maturities of at least ten
          years. U.S. government securities also include indirect obligations of
          the U.S. government that are issued by federal agencies and government
          sponsored entities. Unlike Treasury securities, agency securities
          generally are not backed by the full faith and credit of the U.S.
          government. Some agency securities are supported by the right of the
          issuer to borrow from the Treasury, others are supported by the
          discretionary authority of the U.S. government to purchase the
          agency's obligations and others are supported only by the credit of
          the sponsoring agency.

 30 Janus Aspen Series
<PAGE>

          VARIABLE AND FLOATING RATE SECURITIES have variable or floating rates
          of interest and, under certain limited circumstances, may have varying
          principal amounts. These securities pay interest at rates that are
          adjusted periodically according to a specified formula, usually with
          reference to some interest rate index or market interest rate. The
          floating rate tends to decrease the security's price sensitivity to
          changes in interest rates.

          WARRANTS are securities, typically issued with preferred stock or
          bonds, that give the holder the right to buy a proportionate amount of
          common stock at a specified price, usually at a price that is higher
          than the market price at the time of issuance of the warrant. The
          right may last for a period of years or indefinitely.

          WHEN-ISSUED, DELAYED DELIVERY AND FORWARD TRANSACTIONS generally
          involve the purchase of a security with payment and delivery at some
          time in the future - i.e., beyond normal settlement. The Portfolios do
          not earn interest on such securities until settlement and bear the
          risk of market value fluctuations in between the purchase and
          settlement dates. New issues of stocks and bonds, private placements
          and U.S. government securities may be sold in this manner.

          ZERO COUPON BONDS are debt securities that do not pay regular interest
          at regular intervals, but are issued at a discount from face value.
          The discount approximates the total amount of interest the security
          will accrue from the date of issuance to maturity. The market value of
          these securities generally fluctuates more in response to changes in
          interest rates than interest-paying securities.

II. FUTURES, OPTIONS AND OTHER DERIVATIVES

          FORWARD CONTRACTS are contracts to purchase or sell a specified amount
          of a financial instrument for an agreed upon price at a specified
          time. Forward contracts are not currently exchange traded and are
          typically negotiated on an individual basis. The Portfolios may enter
          into forward currency contracts to hedge against declines in the value
          of securities denominated in, or whose value is tied to, a currency
          other than the U.S. dollar or to reduce the impact of currency
          appreciation on purchases of such securities. They may also enter into
          forward contracts to purchase or sell securities or other financial
          indices.

          FUTURES CONTRACTS are contracts that obligate the buyer to receive and
          the seller to deliver an instrument or money at a specified price on a
          specified date. The Portfolios may buy and sell futures contracts on
          foreign currencies, securities and financial indices including
          interest rates or an index of U.S. government, foreign government,
          equity or fixed-income securities. The Portfolios may also buy options
          on futures contracts. An option on a futures contract gives the buyer
          the right, but not the obligation, to buy or sell a futures contract
          at a specified price on or before a specified date. Futures contracts
          and options on futures are standardized and traded on designated
          exchanges.

          INDEXED/STRUCTURED SECURITIES are typically short- to
          intermediate-term debt securities whose value at maturity or interest
          rate is linked to currencies, interest rates, equity securities,
          indices, commodity prices or other financial indicators. Such
          securities may be positively or negatively indexed (i.e. their value
          may increase or decrease if the reference index or instrument
          appreciates). Indexed/structured securities may have return
          characteristics similar to direct investments in the underlying
          instruments and may be more volatile than the underlying instruments.
          A Portfolio bears the market risk of an investment in the underlying
          instruments, as well as the credit risk of the issuer.

          INTEREST RATE SWAPS involve the exchange by two parties of their
          respective commitments to pay or receive interest (e.g., an exchange
          of floating rate payments for fixed rate payments).

          INVERSE FLOATERS are debt instruments whose interest rate bears an
          inverse relationship to the interest rate on another instrument or
          index. For example, upon reset the interest rate payable on a security
          may go down when the underlying index has risen. Certain inverse
          floaters may have an interest rate reset

                                                Glossary of investment terms  31
<PAGE>

          mechanism that multiplies the effects of change in the underlying
          index. Such mechanism may increase the volatility of the security's
          market value.

          OPTIONS are the right, but not the obligation, to buy or sell a
          specified amount of securities or other assets on or before a fixed
          date at a predetermined price. The Portfolios may purchase and write
          put and call options on securities, securities indices and foreign
          currencies.

 32 Janus Aspen Series
<PAGE>
                                                EXPLANATION OF RATING CATEGORIES


          The following is a description of credit ratings issued by two of the
          major credit ratings agencies. Credit ratings evaluate only the safety
          of principal and interest payments, not the market value risk of lower
          quality securities. Credit rating agencies may fail to change credit
          ratings to reflect subsequent events on a timely basis. Although Janus
          Capital considers security ratings when making investment decisions,
          it also performs its own investment analysis and does not rely solely
          on the ratings assigned by credit agencies.

STANDARD & POOR'S
RATINGS SERVICES

<TABLE>
                <S>                          <C>
                BOND RATING                  EXPLANATION
                -----------------------------------------------------------------------------------------
                Investment Grade
                AAA......................... Highest rating; extremely strong capacity to pay principal
                                             and interest.
                AA.......................... High quality; very strong capacity to pay principal and
                                             interest.
                A........................... Strong capacity to pay principal and interest; somewhat more
                                             susceptible to the adverse effects of changing circumstances
                                             and economic conditions.
                BBB......................... Adequate capacity to pay principal and interest; normally
                                             exhibit adequate protection parameters, but adverse economic
                                             conditions or changing circumstances more likely to lead to
                                             a weakened capacity to pay principal and interest than for
                                             higher rated bonds.
                Non-Investment Grade
                BB, B, CCC, CC, C........... Predominantly speculative with respect to the issuer's
                                             capacity to meet required interest and principal payments.
                                             BB - lowest degree of speculation; C - the highest degree of
                                             speculation. Quality and protective characteristics
                                             outweighed by large uncertainties or major risk exposure to
                                             adverse conditions.
                D........................... In default.
</TABLE>

                                            Explanation of rating categories  33
<PAGE>

MOODY'S INVESTORS SERVICE, INC.

<TABLE>
                <S>                          <C>
                BOND RATING                  EXPLANATION
                -----------------------------------------------------------------------------------------
                Investment Grade
                Aaa......................... Highest quality, smallest degree of investment risk.
                Aa.......................... High quality; together with Aaa bonds, they compose the
                                             high-grade bond group.
                A........................... Upper-medium grade obligations; many favorable investment
                                             attributes.
                Baa......................... Medium-grade obligations; neither highly protected nor
                                             poorly secured. Interest and principal appear adequate for
                                             the present but certain protective elements may be lacking
                                             or may be unreliable over any great length of time.
                Non-Investment Grade
                Ba.......................... More uncertain, with speculative elements. Protection of
                                             interest and principal payments not well safeguarded during
                                             good and bad times.
                B........................... Lack characteristics of desirable investment; potentially
                                             low assurance of timely interest and principal payments or
                                             maintenance of other contract terms over time.
                Caa......................... Poor standing, may be in default; elements of danger with
                                             respect to principal or interest payments.
                Ca.......................... Speculative in a high degree; could be in default or have
                                             other marked shortcomings.
                C........................... Lowest-rated; extremely poor prospects of ever attaining
                                             investment standing.
</TABLE>

          Unrated securities will be treated as noninvestment grade securities
          unless a portfolio manager determines that such securities are the
          equivalent of investment grade securities. Securities that have
          received ratings from more than one agency are considered investment
          grade if at least one agency has rated the security investment grade.

 34 Janus Aspen Series
<PAGE>

SECURITIES HOLDINGS BY RATING CATEGORY

          During the fiscal period ended December 31, 1999, the percentage of
          securities holdings for Flexible Income Portfolio by rating category
          based upon a weighted monthly average was:

<TABLE>
<CAPTION>
                FLEXIBLE INCOME PORTFOLIO
                ----------------------------------------------------------------------------------------
                <S>                                                           <C>
                    BONDS-S&P RATING:
                 AAA                                                                        5%
                 AA                                                                         6%
                 A                                                                         10%
                 BBB                                                                       23%
                 BB                                                                        12%
                 B                                                                         19%
                 CCC                                                                        2%
                 CC                                                                         0%
                 C                                                                          0%
                 Not Rated                                                                  6%
                 Preferred Stock                                                            2%
                 Cash and Options                                                          15%
                 TOTAL                                                                    100%
                ----------------------------------------------------------------------------------------
</TABLE>

          No other Portfolio described in this Prospectus held 5% or more of its
          assets in bonds rated below investment grade for the fiscal period
          ended December 31, 1999.

                                            Explanation of rating categories  35
<PAGE>

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 36 Janus Aspen Series
<PAGE>

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                                            Explanation of rating categories  37
<PAGE>

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<PAGE>

[JANUS LOGO]

1-800-525-0020

100 Fillmore Street
Denver, Colorado 80206-4928
janus.com

You can request other information, including a Statement of
Additional Information, free of charge, by contacting your plan
sponsor or visiting our Web site at janus.com. Other information is
also available from financial intermediaries that sell Shares of the
Portfolios.

The Statement of additional Information provides detailed
information about the Portfolios and is incorporated into this
Prospectus by reference. You may review and copy information about
the Portfolios (including the Portfolios' Statement of Additional
Information) at the Public Reference Room of the SEC or get text
only copies, after paying a duplicating fee, by sending an
electronic request by e-mail to [email protected] or by writing to
or calling the Public Reference Room, Washington, D.C. 20549-0102
(1-202-942-8090). You may also obtain reports and other information
about the Portfolios from the Electronic, Data Gathering Analysis
and Retrieval (EDGAR) Database on the SEC's Web site at
http://www.sec.gov.

                    Investment Company Act File No. 811-7736



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