JANUS INVESTMENT FUND
485BPOS, 1999-02-16
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    Form N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933                [X]

         Pre- Effective Amendment No.                                  [ ]

         Post-Effective Amendment No. 87                               [X]

                                       and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT
         OF 1940                                                       [X]

         Amendment No. 70                                              [X]

                        (Check appropriate box or boxes.)

JANUS INVESTMENT FUND
(Exact Name of Registrant as Specified in Charter)

100 Fillmore Street, Denver, Colorado 80206-4928
Address of Principal Executive Offices           (Zip Code)

Registrant's Telephone No., including Area Code:  303-333-3863

Thomas A. Early - 100 Fillmore Street, Denver, Colorado 80206-4928
(Name and Address of Agent for Service)

Approximate Date of Proposed Offering:  February 17, 1999

It is proposed that this filing will become effective (check appropriate box):
         [ ]    immediately upon filing pursuant to paragraph (b) of Rule 485
         [X]    on February 17, 1999 pursuant to paragraph (b) of Rule 485
         [ ]    60 days after filing pursuant to paragraph (a)(1) of Rule 485
         [ ]    on (date) pursuant to paragraph (a)(1) of Rule 485
         [ ]    75 days after filing pursuant to paragraph (a)(2) of Rule 485
         [ ]    on (date) pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:
         [ ]    This post-effective amendment designates a new effective date
                for a previously filed post-effective amendment.

<PAGE>
                             
                              JANUS INVESTMENT FUND

                              Cross Reference Sheet
                   Between the Prospectuses and Statements of
                    Additional Information and Form N-1A Item


FORM N-1A ITEM                             CAPTION IN PROSPECTUSES

PART A

1.    Front and Back Cover Pages           Cover Pages

2.    Risk/Return Summary:                 Risk/Return Summary
      Investments, Risks, and
      Performance

3.    Risk/Return Summary:  Fee            Risk/Return Summary
      Table

4.    Investment Objectives,               Investment Objectives, Principal
      Principal Investment                 Investment Strategies, and Risks; 
      Strategies, and Related Risks        Rating Categories (Combined Income 
                                           Prospectus only)

5.    Management's Discussion of           Not Applicable
      Fund Performance

6.    Management, Organization, and        Management of the Funds
      Capital Structure

7.    Shareholder Information              Shareholder's Manual; Other 
                                           Information Distributions and Taxes

8.    Distribution Arrangements            Not Applicable

9.    Financial Highlights                 Financial Highlights
      Information

<PAGE>

FORM N-1A ITEM                             CAPTION IN STATEMENTS OF 
                                           ADDITIONAL INFORMATION

PART B

10.   Cover Page and Table of              Cover Page; Table of Contents
      Contents

11.   Fund History                         Miscellaneous Information

12.   Description of the Fund and          Classification, Portfolio Turnover, 
      Its Investments and Risks            Investment Policies and Restrictions,
                                           Investment Strategies and Risks;
                                           Appendix A; Appendix B (Money Market 
                                           Fund Statements of Additional 
                                           Information only)

13.   Management of the Fund               Investment Adviser (Combined Growth 
                                           and Income Funds, Venture and 
                                           Overseas Statements of Additional 
                                           Information only); Investment Adviser
                                           and Administrator (Money Market Fund 
                                           Statements of Additional Information 
                                           only); Trustees and Officers

14.   Control Persons and Principal        Principal Shareholders
      Holders of Securities

15.   Investment Advisory and Other        Investment Adviser (Combined Growth
      Services                             and Income Funds, Venture and 
                                           Overseas Statements of Additional 
                                           Information only); Investment Adviser
                                           and Administrator (Money Market Fund 
                                           Statements of Additional Information 
                                           only); Custodian, Transfer Agent, and
                                           Certain Affiliations; Portfolio 
                                           Transactions and Brokerage; Trustees
                                           and Officers; Miscellaneous 
                                           Information

<PAGE>

16.   Brokerage Allocation and             Portfolio Transactions and Brokerage
      Other Practices                                             

17.   Capital Stock and Other              Purchase of Shares; Redemption of
      Securities                           Shares; Miscellaneous Information

18.   Purchase, Redemption, and            Purchase of Shares; Redemption of
      Pricing of Shares                    Shares; Miscellaneous Information

19.   Taxation of the Fund                 Tax-Deferred Accounts; Income 
                                           Dividends, Capital Gains
                                           Distributions, and Tax Status 
                                           (Combined Growth and Income Funds, 
                                           Venture and Overseas Statements of
                                           Additional Information only); 
                                           Dividends and Tax Status (Money 
                                           Market Fund Statements of Additional 
                                           Information only)

20.   Underwriters                         Custodian, Transfer Agent, and
                                           Certain Affiliations

21.   Calculation of Performance           Performance Information (Combined 
      Data                                 Growth and Income Funds, Venture and 
                                           Overseas Statements of Additional 
                                           Information); Performance Data (Money
                                           Market Fund Statements of Additional 
                                           Information only)

22.   Financial Statements                 Financial Statements
<PAGE> 
                                  [JANUS LOGO]

 
                         Janus Equity Funds
 
                                       PROSPECTUS
                                       FEBRUARY 17, 1999
                                       Janus Fund
                                       Janus Enterprise Fund
                                       Janus Mercury Fund
                                       Janus Olympus Fund
                                       Janus Special Situations Fund
                                       Janus Twenty Fund
                                       Janus Global Life Sciences Fund
                                       Janus Global Technology Fund
                                       Janus Worldwide Fund
                                       Janus Balanced Fund
                                       Janus Equity Income Fund
                                       Janus Growth and Income Fund
                         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]
<PAGE> 
 
                                                               Table of contents
 
<TABLE>
                <S>                                               <C>
                RISK/RETURN SUMMARY
                   Growth funds.................................    2
                   Combination funds............................   11
                   Fees and expenses............................   16
                INVESTMENT OBJECTIVES, PRINCIPAL INVESTMENT
                STRATEGIES AND RISKS
                   Growth funds.................................   18
                   Combination funds............................   24
                   General portfolio policies...................   27
                   Risks........................................   30
                SHAREHOLDER'S MANUAL
                   Minimum investments..........................   39
                   Types of account ownership...................   39
                   How to open your Janus account...............   41
                   How to purchase shares.......................   42
                   How to exchange shares.......................   44
                   How to redeem shares.........................   46
                   Shareholder services and account policies....   51
                MANAGEMENT OF THE FUNDS
                   Investment adviser...........................   55
                   Investment personnel.........................   56
                OTHER INFORMATION............... ...............   60
                DISTRIBUTIONS AND TAXES
                   Distributions................................   61
                   Taxes........................................   63
                FINANCIAL HIGHLIGHTS.............. .............   65
                GLOSSARY
                   Glossary of investment terms.................   76
 
</TABLE>
 
                                                            Table of contents  1
<PAGE> 
Risk return summary
 
GROWTH FUNDS
 
               The Growth Funds 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 GROWTH FUNDS?
 
- --------------------------------------------------------------------------------
 
               DOMESTIC GROWTH FUNDS
 
               - JANUS FUND seeks long-term growth of capital in a manner
                 consistent with the preservation of capital.
 
               - JANUS ENTERPRISE FUND, JANUS MERCURY FUND, JANUS OLYMPUS
                 FUND AND JANUS TWENTY FUND seek long-term growth of capital.
 
               - JANUS SPECIAL SITUATIONS FUND seeks capital appreciation.
 
               GLOBAL GROWTH FUNDS
 
               - JANUS GLOBAL LIFE SCIENCES FUND AND JANUS GLOBAL TECHNOLOGY
                 FUND seek long-term growth of capital.
 
               - JANUS WORLDWIDE FUND seeks long-term growth of capital in a
                 manner consistent with the preservation of capital.
 
               The Funds' Trustees may change these objectives without a
               shareholder vote and the Funds will notify you of any changes
               that are material. If there is a material change to a Fund's
               objective or policies, you should consider whether that Fund
               remains an appropriate investment for you. There is no guarantee
               that a Fund will meet its objective.
 
2. WHAT ARE THE MAIN INVESTMENT STRATEGIES OF THE GROWTH FUNDS?
 
               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
 
 2 Janus Equity Funds
<PAGE> 
 
               significant portion of a Fund's assets may be in cash or similar
               investments.
 
               JANUS FUND invests primarily in common stocks selected for
               their growth potential. Although the Fund can invest in
               companies of any size, it generally invests in larger, more
               established companies.
 
               JANUS ENTERPRISE FUND invests primarily in common stocks
               selected for their growth potential, and normally invests at
               least 50% of its equity assets in medium-sized companies.
 
               JANUS MERCURY FUND invests primarily in common stocks selected
               for their growth potential. The Fund may invest in companies
               of any size, from larger, well-established companies to
               smaller, emerging growth companies.
 
               JANUS OLYMPUS FUND invests primarily in common stocks selected
               for their growth potential. The Fund may invest in companies
               of any size, from larger, well-established companies to
               smaller, emerging growth companies.
 
               JANUS SPECIAL SITUATIONS FUND invests primarily in common
               stocks selected for their capital appreciation potential. The
               Fund emphasizes stocks of "special situation" companies that
               the portfolio manager believes have been overlooked or
               undervalued by other investors. A "special situation" arises
               when, in the portfolio manager's opinion, securities of a
               particular company will appreciate in value due to a specific
               development. The portfolio manager pays particular attention
               to companies that he thinks have high free cash flows.
 
               JANUS TWENTY FUND invests primarily in common stocks selected
               for their growth potential. The Fund normally concentrates its
               investments in a core group of 20-30 common stocks.
 
               JANUS GLOBAL LIFE SCIENCES FUND invests primarily in equity
               securities of U.S. and foreign companies selected for their
               growth potential. Normally, it invests at least 65% of its
               total assets in securities of companies that the portfolio
               manager believes have a life science orientation. As a
               fundamental
 
                                                          Risk return summary  3
<PAGE> 
 
               policy, the Fund normally invests at least 25% of its total
               assets, in the aggregate, in the following industry groups:
               health care; pharmaceuticals; agriculture; cosmetics/personal
               care; and biotechnology.
 
               JANUS GLOBAL TECHNOLOGY FUND invests primarily in equity
               securities of U.S. and foreign companies selected for their
               growth potential. Normally, it invests at least 65% of its
               total assets in securities of companies that the portfolio
               manager believes will benefit significantly from advances or
               improvements in technology.
 
               JANUS WORLDWIDE FUND invests primarily in common stocks of
               companies of any size throughout the world. The Fund normally
               invests in issuers from at least five different countries,
               including the United States. The Fund may at times invest in
               fewer than five countries or even a single country.
 
3. WHAT ARE THE MAIN RISKS OF INVESTING IN THE GROWTH FUNDS?
 
               The biggest risk is that the Funds' returns may vary, and you
               could lose money. If you are considering investing in any of
               the Growth Funds, 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 Fund's portfolio may decrease if the value of
               an individual company in the portfolio decreases. The value of
               a Fund's portfolio could also decrease if the stock market
               goes down. If the value of a Fund's portfolio decreases, a
               Fund's net asset value (NAV) will also decrease, which means
               if you sell your shares in a Fund you would get back less
               money.
 
   
               JANUS SPECIAL SITUATIONS FUND emphasizes investments in
               special situation companies which may not appreciate if an
               anticipated development does not occur or attract the
               anticipated attention. See "What is a 'special situation'?" on
               page 21 for an explanation of what the portfolio manager may
               consider a special situation.
    
 
 4 Janus Equity Funds
<PAGE> 
 
   
               JANUS GLOBAL LIFE SCIENCES FUND concentrates its investments
               in related industry groups. Because of this, companies in its
               portfolio may share common characteristics and react similarly
               to market developments. For example, many companies with a
               life science orientation are highly regulated and may be
               dependent upon certain types of technology. As a result,
               changes in government funding or subsidies, new or anticipated
               legislative changes, or technological advances could affect
               the value of such companies and, therefore, the Fund's NAV.
               The Fund's returns may be more volatile than those of a less
               concentrated portfolio.
    
 
   
               Although JANUS GLOBAL TECHNOLOGY FUND does not concentrate its
               investments in specific industries, it may invest in companies
               related in such a way that they react similarly to certain
               market pressures. For example, competition among technology
               companies may result in increasingly aggressive pricing of
               their products and services, which may affect the
               profitability of companies in the Fund's portfolio. In
               addition, because of the rapid pace of technological
               development, products or services developed by companies in
               the Fund's portfolio may become rapidly obsolete or have
               relatively short product cycles. As a result, the Fund's
               returns may be considerably more volatile than the returns of
               a fund that does not invest in similarly related companies.
    
 
               JANUS GLOBAL LIFE SCIENCES FUND, JANUS GLOBAL TECHNOLOGY FUND
               AND JANUS WORLDWIDE FUND 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.
 
                                                          Risk return summary  5
<PAGE> 
 
               JANUS ENTERPRISE FUND, JANUS OLYMPUS FUND, JANUS SPECIAL
               SITUATIONS FUND, JANUS TWENTY FUND, JANUS GLOBAL LIFE SCIENCES
               FUND AND JANUS GLOBAL TECHNOLOGY FUND are nondiversified. In
               other words, they 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 a Fund's NAV and total return. Since JANUS
               TWENTY FUND normally concentrates in a core portfolio of 20-30
               stocks, this risk may be increased.
 
               An investment in these Funds 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 illustrates how each of the Growth
               Fund's performance has varied over time. The bar charts depict
               the change in performance from year-to-year during the period
               indicated. The tables compare each Fund's average annual returns
               for the periods indicated to a broad-based securities market
               index.
 
 6 Janus Equity Funds
<PAGE> 
 
                JANUS FUND

A BAR CHART showing Annual Total Returns for Janus Fund from 1989 through 1998:

   
                Annual returns for periods ended 12/31

46.32%  (0.74%)  42.80%  6.87%  10.92%  (1.10%) 29.43%  19.61%  22.72%  38.89%
 1989    1990     1991   1992    1993    1994    1995    1996    1997    1998

Each percentage is represented by a bar of proportionate size with the actual
total return printed above the bar.

                Best Quarter: 4th-1998 28.44%; Worst Quarter: 3rd-1990 (13.91%)
    

                         Average annual total return for periods ended 12/31/98
                         ------------------------------------------------------

   
<TABLE>
<CAPTION>
                                                                                Since Inception
                                                 1 year   5 years   10 years       (2/5/70)
                <S>                              <C>      <C>       <C>         <C>             
                Janus Fund                       38.89%   21.15%     20.43%         17.59%
                S&P 500 Index*                   28.74%   24.08%     19.20%         13.83%
</TABLE>
    
 
                * The S&P 500 is the Standard & Poor's Composite Index of 500
                  Stocks, a widely recognized, unmanaged index of common stock
                  prices.
 
                JANUS ENTERPRISE FUND

A BAR CHART showing Annual Total Returns for Janus Enterprise Fund from 1993 
through 1998: 

   
                Annual returns for periods ended 12/31
 
                15.64%    8.92%     27.25%    11.65%    10.82%    33.75%
                 1993      1994      1995      1996      1997      1998

Each percentage is represented by a bar of proportionate size with the actual
total return printed above the bar.

               Best Quarter: 4th-1998 34.15%; Worst Quarter: 3rd-1998 (14.63%)
    

                          Average annual total return for periods ended 12/31/98
                          ------------------------------------------------------

   
<TABLE>
<CAPTION>
                                                                            Since Inception
                                                         1 year   5 years      (9/1/92)
                <S>                                 <C>  <C>      <C>       <C>             <C>
                Janus Enterprise Fund                    33.75%   18.06%        21.54%
                S&P MidCap 400 Index+                    18.25%   18.67%        19.19%
                                                    ----------------------------------
</TABLE>
    
 
   
               + The S&P MidCap 400 Index is an unmanaged group of 400
                 domestic stocks chosen for their market size, liquidity and
                 industry group representation.
    
 
                                                          Risk return summary  7
<PAGE> 
 
                JANUS MERCURY FUND
 
A BAR CHART showing Annual Total Returns for Janus Mercury Fund from 1994 
through 1998:
   
                Annual returns for periods ended 12/31

                      15.86%  33.01%  17.67%  11.88%  58.41%
                       1994    1995    1996    1997    1998

Each percentage is represented by a bar of proportionate size with the actual 
total return printed above the bar.

                Best Quarter: 4th-1998 30.04%; Worst Quarter: 3rd-1998 (6.94%)
    

                         Average annual total return for periods ended 12/31/98
                         ------------------------------------------------------

   
<TABLE>
<CAPTION>
                                                                           Since Inception
                                                        1 year   5 years      (5/3/93)
                <S>                                     <C>      <C>       <C>
                Janus Mercury Fund                      58.41%   26.30%        26.86%
                S&P 500 Index*                          28.74%   24.08%        22.64%
                                                        -----------------------------
</TABLE>
    
 
               * The S&P 500 is the Standard & Poor's Composite Index of 500
                 Stocks, a widely recognized, unmanaged index of common stock
                 prices.
 
                JANUS OLYMPUS FUND

A BAR CHART showing Annual Total Returns for Janus Olympus Fund from 1996
through 1998:
   
                Annual returns for periods ended 12/31
 
                                  21.73%  26.73%  56.97%
                                   1996    1997    1998

Each percentage is represented by a bar of proportionate size with the actual 
total return printed above the bar.

                Best Quarter: 4th-1998 32.66%; Worst Quarter: 3rd-1998 (7.93%)
    
 
                          Average annual total return for periods ended 12/31/98
                          ------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                          Since Inception
                                                                 1 year     (12/29/95)
                <S>                                              <C>      <C>
                Janus Olympus Fund                               56.97%       34.28%
                S&P 500 Index+                                   28.74%       28.27%
                                                                 --------------------
</TABLE>
    
 
   
               + The S&P 500 is the Standard & Poor's Composite Index of 500
                 Stocks, a widely recognized, unmanaged index of common stock
                 prices.
    
 
 8 Janus Equity Funds
<PAGE> 
 
                JANUS SPECIAL SITUATIONS FUND

A BAR CHART showing Annual Total Returns for Janus Special Situations Fund from
1997 through 1998:
   
                Annual returns for periods ended 12/31

                                      46.04%  25.31%
                                       1997    1998

Each percentage is represented by a bar of proportionate size with the actual
total return printed above the bar.

                Best Quarter: 4th-1998 28.53%; Worst Quarter: 3rd-1998 (19.55%)


    
 
                Average annual total return for periods ended 12/31/98
                ------------------------------------------------------

   
<TABLE>
<CAPTION>
                                                                          Since Inception
                                                                 1 year     (12/31/96)
                <S>                                              <C>      <C>
                Janus Special Situations Fund                    25.31%       35.28%
                S&P 500 Index*                                   28.74%       31.03%
                                                                 --------------------
</TABLE>
    
 
               * The S&P 500 is the Standard & Poor's Composite Index of 500
                 Stocks, a widely recognized, unmanaged index of common stock
                 prices.
 
                JANUS TWENTY FUND

A BAR CHART showing Annual Total Returns for Janus Twenty Fund from 1991 through
1998:
 
   
                Annual returns for periods ended 12/31

50.85%  0.59%  69.21%  1.97%   3.43%   (6.73%)  36.22  27.85%  29.70%  73.39%
1989    1990     1991   1992    1993    1994    1995    1996    1997    1998
 
Each percentage is represented by a bar of proportionate size with the actual
total return printed above the bar.

                Best Quarter: 4th-1998 29.67%; Worst Quarter: 3rd-1990 (17.71%)
    


                          Average annual total return for periods ended 12/31/98
                          ------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                            Since Inception
                                              1 year   5 years   10 years      (4/30/85)
                <S>                           <C>      <C>       <C>        <C>
                Janus Twenty Fund             73.39%   29.58%     25.76%        20.90%
                S&P 500 Index+                28.74%   24.08%     19.20%        18.51%
                                              ---------------------------------------
</TABLE>
    
 
   
               + The S&P 500 is the Standard & Poor's Composite Index of 500
                 Stocks, a widely recognized, unmanaged index of common stock
                 prices.
    
 
                                                          Risk return summary  9
<PAGE> 
 
                JANUS WORLDWIDE FUND

A BAR CHART showing Annual Total Returns for Janus Worldwide Fund from 1992 
through 1998:
 
   
                Annual returns for periods ended 12/31

                9.01%   28.41%  3.61%    21.90%   26.40%   20.48%   25.87%
                 1992    1993    1994     1995     1996     1997     1998

Each percentage is represented by a bar of proportionate size with the actual
total return printed above the bar.

                Best Quarter: 4th-1998 20.24%; Worst Quarter: 3rd-1998 (16.10%)
    
 
                          Average annual total return for periods ended 12/31/98
                          ------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                           Since Inception
                                                        1 year   5 years      (5/15/91)
                <S>                                     <C>      <C>       <C>
                Janus Worldwide Fund                    25.87%   19.34%        20.72%
                Morgan Stanley International Worldwide
                  Index*                                24.34%   15.68%        13.22%
                                                        -----------------------------
</TABLE>
    
 
               * The Morgan Stanley International Worldwide Index is a market
                 capitalization weighted index composed of countries
                 representative of the market structure of 47 developed and
                 emerging markets.
 
               Since Janus Global Life Sciences Fund and Janus Global Technology
               Fund did not commence operations until December 31, 1998, there
               is no performance shown.
 
               The Growth Funds' past performance does not necessarily indicate
               how they will perform in the future.
 
 10 Janus Equity Funds
<PAGE> 
 
COMBINATION FUNDS
 
               The Combination Funds are designed for investors who primarily
               seek growth of capital with varying degrees of emphasis on
               income. These Funds are not designed for investors who desire a
               consistent level of income.
 
1. WHAT ARE THE INVESTMENT OBJECTIVES OF THE COMBINATION FUNDS?
 
- --------------------------------------------------------------------------------
 
               - JANUS BALANCED FUND seeks long-term capital growth, consistent
                 with preservation of capital and balanced by current income.
 
               - JANUS EQUITY INCOME FUND seeks current income and long-term
                 growth of capital.
 
               - JANUS GROWTH AND INCOME FUND seeks long-term capital growth and
                 current income.
 
               The Funds' Trustees may change these objectives without a
               shareholder vote and the Funds will notify you of any changes
               that are material. If there is a material change to a Fund's
               objective or policies, you should consider whether that Fund
               remains an appropriate investment for you. There is no guarantee
               that a Fund will meet its objective.
 
2. WHAT ARE THE MAIN INVESTMENT STRATEGIES OF THE COMBINATION FUNDS?
 
               The portfolio managers apply a "bottom up" approach in choosing
               investments. In other words, they look mostly for equity and
               income-producing securities that meet their investment criteria
               one at a time. If a portfolio manager is unable to find such
               investments, much of a Fund's assets may be in cash or similar
               investments.
 
               JANUS BALANCED FUND 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 Fund will normally invest at least 25% of
               its assets in fixed-income securities.
 
                                                         Risk return summary  11
<PAGE> 
 
               JANUS EQUITY INCOME FUND normally emphasizes investments in
               common stocks, and growth potential is a significant investment
               consideration. Normally, it invests at least 65% of its assets in
               income-producing equity securities.
 
               JANUS GROWTH AND INCOME FUND normally emphasizes investments in
               common stocks. It will normally invest up to 75% of its assets in
               equity securities selected primarily for their growth potential,
               and at least 25% of its assets in securities the portfolio
               manager believes have income potential. Equity securities may
               make up part of this income component if they currently pay
               dividends or the portfolio manager believes they have potential
               for increasing or commencing dividend payments.
 
3. WHAT ARE THE MAIN RISKS OF INVESTING IN THE COMBINATION FUNDS?
 
   
               The biggest risk is that the Funds' returns may vary, and you
               could lose money. If you are considering investing in any of the
               Combination Funds, 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 Fund's portfolio may decrease if the value of an
               individual company in the portfolio decreases. The value of a
               Fund's portfolio could also decrease if the stock market goes
               down. If the value of a Fund's portfolio decreases, a Fund's NAV
               will also decrease, which means if you sell your shares in a Fund
               you would get back less money.
 
   
               The income component of the Funds' portfolios 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 Fund's NAV may
               likewise decrease. Another fundamental risk associated with
               fixed-income securities is credit risk, which is the risk that an
               issuer will be unable to make principal and interest payments
               when due.
    
 
 12 Janus Equity Funds
<PAGE> 
 
               An investment in these Funds 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 illustrates how each Combination Fund's
               performance has varied over time. The bar chart depicts the
               change in performance from year-to-year during the period
               indicated. The tables compare each Fund's average annual returns
               for the period indicated to a broad-based securities market
               index.
 
                                                         Risk return summary  13
<PAGE> 
 
                JANUS BALANCED FUND

A BAR CHART showing Annual Total Returns for Janus Balanced Fund from 1993 
through 1998:

   
                Annual returns for periods ended 12/31

                    10.56%  0.02%    27.31%   15.30%   21.81%   31.20%
                     1993    1994     1995     1996     1997     1998

Each percentage is represented by a bar of proportionate size with the actual 
total return printed above the bar.

                Best Quarter: 4th-1998 18.75%; Worst Quarter: 3rd-1998 (4.49%)
    
 
                          Average annual total return for periods ended 12/31/98
                          ------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                            Since Inception
                                                         1 year   5 years      (9/1/92)
                <S>                                      <C>      <C>       <C>
                Janus Balanced Fund                      31.20%    18.60%        18.43%
                S&P 500 Index*                           28.74%    24.08%        21.54%
                Lehman Brothers Gov't/Corp Bond Index+    9.47%     7.30%         7.73%
                                                          -----------------------------
</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.
 
                JANUS EQUITY INCOME FUND

A BAR CHART showing Annual Total Returns for Janus Equity Income Fund from 1997
through 1998:
   
                Annual returns for periods ended 12/31

                                  31.08%   40.50%
                                   1997     1998

Each percentage is represented by a bar of proportionate size with the actual 
total return printed above the bar.

                Best Quarter: 4th-1998 26.34%; Worst Quarter: 3rd-1998 (8.06%)
    
 
                          Average annual total return for periods ended 12/31/98
                          ------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                           Since Inception
                                                                  1 year      (6/28/96)
                <S>                                               <C>      <C>
                Janus Equity Income Fund                          40.05%        35.11%
                S&P 500 Index++                                   28.74%        29.74%
                                                                   --------------------
</TABLE>
    
 
               ++ The S&P 500 is the Standard & Poor's Composite Index of 500
                  Stocks, a widely recognized, unmanaged index of common stock
                  prices.
 
 14 Janus Equity Funds
<PAGE> 
 
                JANUS GROWTH AND INCOME FUND

A BAR CHART showing Annual Total Returns for Janus Growth and Income Fund from 
1992 through 1998:
   
                Annual returns for periods ended 12/31

                5.35%   6.70%   (4.87%)  36.35    26.03%   34.66%   34.87%
                 1992    1993    1994     1995     1996     1997     1998

Each percentage is represented by a bar of proportionate size with the actual
total return printed above the bar.

                Best Quarter: 4th-1998 21.49%; Worst Quarter: 3rd-1998 (8.97%)
    
 
                          Average annual total return for periods ended 12/31/98
                          ------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                           Since Inception
                                                        1 year   5 years      (5/15/91)
                <S>                                     <C>      <C>       <C>
                Janus Growth and Income Fund            34.87%   24.31%        22.08%
                S&P 500 Index*                          28.74%   24.08%        20.00%
                                                        -----------------------------
</TABLE>
    
 
               * The S&P 500 is the Standard & Poor's Composite Index of 500
                 Stocks, a widely recognized, unmanaged index of common stock
                 prices.
 
               The Combination Funds' past performance does not necessarily
               indicate how they will perform in the future.
 
                                                         Risk return summary  15
<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 Funds.
 
   
               ANNUAL FUND OPERATING EXPENSES are paid out of a Fund'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
               on the next page shows, these costs are borne indirectly by all
               shareholders.
    
 
 16 Janus Equity Funds
<PAGE> 
 
   
This table describes the fees and expenses that you may pay if you buy and hold
shares of the Funds. It is based upon gross expenses (without the effect of
expense offset arrangements) for the fiscal year ended October 31, 1998.
    
 
<TABLE>
<CAPTION>
                                             Management                  Total Annual Fund
                                                Fee         Other       Operating Expenses
                                                           Expenses
    <S>                                      <C>           <C>         <C>                   
    Janus Fund                                 0.65%        0.22%              0.87%
    Janus Enterprise Fund                      0.72%        0.36%              1.08%
    Janus Mercury Fund                         0.67%        0.30%              0.97%
    Janus Olympus Fund                         0.70%        0.31%              1.01%
    Janus Special Situations Fund              0.70%        0.38%              1.08%
    Janus Twenty Fund                          0.65%        0.26%              0.91%
    Janus Global Life Sciences Fund            0.75%        0.50%(1)           1.25%
    Janus Global Technology Fund               0.75%        0.50%(1)           1.25%
    Janus Worldwide Fund                       0.65%        0.27%              0.92%
    Janus Balanced Fund                        0.72%        0.31%              1.03%
    Janus Equity Income Fund                   0.75%        0.46%              1.21%
    Janus Growth and Income Fund               0.67%        0.29%              0.96%
</TABLE>
 
- --------------------------------------------------------------------------------
   (1) "Other Expenses" are based on the estimated expenses that the Fund
       expects to incur in its initial fiscal year.
- --------------------------------------------------------------------------------
 
   EXAMPLE:
   This example is intended to help you compare the cost of investing in
   the Funds with the cost of investing in other mutual funds. The example
   assumes that you invest $10,000 in each of the Funds 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 Funds' 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    5 Years    10 Years
    <S>                                      <C>        <C>        <C>        <C>      
                                              --------------------------------------
    Janus Fund                                $ 89       $278       $482       $1,073
    Janus Enterprise Fund                     $110       $343       $595       $1,317
    Janus Mercury Fund                        $ 99       $309       $536       $1,190
    Janus Olympus Fund                        $103       $322       $558       $1,236
    Janus Special Situations Fund             $110       $343       $595       $1,317
    Janus Twenty Fund                         $ 93       $290       $504       $1,120
    Janus Global Life Sciences Fund           $127       $397        N/A          N/A
    Janus Global Technology Fund              $127       $397        N/A          N/A
    Janus Worldwide Fund                      $ 94       $293       $509       $1,131
    Janus Balanced Fund                       $105       $328       $569       $1,259
    Janus Equity Income Fund                  $123       $384       $665       $1,466
    Janus Growth and Income Fund              $ 98       $306       $531       $1,178
</TABLE>
 
                                                         Risk return summary  17
<PAGE> 
Investment objectives, principal 
           investment strategies 
           and risks
 
GROWTH FUNDS
 
               This section takes a closer look at the investment objectives of
               each of the Growth Funds, their principal investment strategies
               and certain risks of investing in the Growth Funds. 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 30-34 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 GROWTH FUNDS
 
               JANUS FUND
               Janus Fund 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 Fund can invest in companies
               of any size, it generally invests in larger, more established
               companies.
 
               JANUS ENTERPRISE FUND
   
               Janus Enterprise Fund seeks long-term growth of capital. It
               pursues its objective by investing primarily in common stocks
               selected for their growth potential, and normally invests at
               least 50% of its equity assets in medium-sized companies. Medium-
               sized companies are those whose market capitalizations fall
               within the range of companies in the S&P MidCap 400 Index. Market
               capitalization is a commonly used measure of the size and value
               of a company. The market capitalizations within the Index will
               vary, but as of December 31, 1998, they ranged from approximately
               $142 million to $73 billion.
    
 
               JANUS MERCURY FUND
               Janus Mercury Fund seeks long-term growth of capital. It pursues
               its objective by investing primarily in common stocks selected
               for
 
 18 Janus Equity Funds
<PAGE> 
 
               their growth potential. The Fund may invest in companies of any
               size, from larger, well-established companies to smaller,
               emerging growth companies.
 
               JANUS OLYMPUS FUND
               Janus Olympus Fund seeks long-term growth of capital. It pursues
               its objective by investing primarily in common stocks selected
               for their growth potential. The Fund may invest in companies of
               any size, from larger, well-established companies to smaller,
               emerging growth companies.
 
               JANUS SPECIAL SITUATIONS FUND
               Janus Special Situations Fund seeks capital appreciation. It
               pursues its objective by investing primarily in common stocks
               selected for their capital appreciation potential. The Fund
               emphasizes stocks of "special situation" companies that the
               portfolio manager believes have been overlooked or undervalued by
               other investors. A "special situation" arises when, in the
               portfolio manager's opinion, securities of a particular company
               will appreciate in value due to a specific development. The
               portfolio manager pays particular attention to companies that he
               thinks may have high free cash flows.
 
               JANUS TWENTY FUND
               Janus Twenty Fund seeks long-term growth of capital. It pursues
               its objective by investing primarily in common stocks selected
               for their growth potential. The Fund normally concentrates its
               investments in a core group of 20-30 common stocks.
 
GLOBAL GROWTH FUNDS
 
               JANUS GLOBAL LIFE SCIENCES FUND
               Janus Global Life Sciences Fund seeks long-term growth of
               capital. It pursues its objective by investing primarily in
               equity securities of U.S. and foreign companies selected for
               their growth potential. Normally, it invests at least 65% of its
               total assets in securities of companies that the portfolio
               manager believes have a life science orientation. As a
               fundamental policy, the Fund normally invests at
 
            Investment objectives, principal investment strategies and risks  19
<PAGE> 
 
               least 25% of its total assets, in the aggregate, in the following
               industry groups: health care; pharmaceuticals; agriculture;
               cosmetics/personal care; and biotechnology.
 
               JANUS GLOBAL TECHNOLOGY FUND
               Janus Global Technology Fund seeks long-term growth of capital.
               It pursues its objective by investing primarily in equity
               securities of U.S. and foreign companies selected for their
               growth potential. Normally, it invests at least 65% of its total
               assets in securities of companies that the portfolio manager
               believes will benefit significantly from advances or improvements
               in technology. These companies generally fall into two
               categories:
 
               a. Companies that the portfolio manager believes have or will
                  develop products, processes or services that will provide
                  significant technological advancements or improvements; and
 
               b. Companies that the portfolio manager believes rely extensively
                  on technology in connection with their operations or services.
 
               JANUS WORLDWIDE FUND
               Janus Worldwide Fund 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 Fund normally
               invests in issuers from at least five different countries,
               including the United States. The Fund may at times invest in
               fewer than five countries or even a single country.
 
 20 Janus Equity Funds
<PAGE> 
 
The following questions and answers are designed to help you better understand
the Growth Funds' principal investment strategies.
 
1. HOW ARE COMMON STOCKS SELECTED?
 
               Each of the Funds 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.
               Realization of income is not a significant consideration when
               choosing investments for the Funds. Income realized on the Funds'
               investments will be incidental to their objectives.
 
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 Funds may invest and the Funds may at
               times have significant foreign exposure.
 
3. WHAT IS A "SPECIAL SITUATION"?
 
               Each Fund may invest in special situations. A special situation
               arises when a portfolio manager believes that the securities of
               an issuer will be recognized and appreciate in value due to a
               specific development with respect to that issuer. Special
               situations may include significant changes in a company's
               allocation of its existing
 
            Investment objectives, principal investment strategies and risks  21
<PAGE> 
 
               capital, a restructuring of assets, or a redirection of free cash
               flows. For example, issuers undergoing significant capital
               changes may include companies involved in spin-offs, sales of
               divisions, mergers or acquisitions, companies emerging from
               bankruptcy, or companies initiating large changes in their debt
               to equity ratio. Companies that are redirecting cash flows may be
               reducing debt, repurchasing shares or paying dividends. Special
               situations may also result from (i) significant changes in
               industry structure through regulatory developments or shifts in
               competition; (ii) a new or improved product, service, operation
               or technological advance; (iii) changes in senior management; or
               (iv) significant changes in cost structure. As noted previously,
               Janus Special Situations Fund emphasizes this type of strategy.
 
4. 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. As noted previously,
               market capitalization is an important investment criteria for
               Janus Enterprise Fund. Although the other Growth Funds offered by
               this Prospectus do not emphasize companies of any particular
               size, Funds with a larger asset base (e.g., Janus Fund) are more
               likely to invest in larger, more established issuers.
 
5. WHAT DOES "LIFE SCIENCE ORIENTATION" MEAN IN RELATION TO JANUS GLOBAL LIFE
   SCIENCES FUND?
 
               Generally speaking, the "life sciences" relate to maintaining or
               improving quality of life. So, for example, companies with a
               "life science orientation" include companies engaged in research,
               development, production or distribution of products or services
               related to health and personal care, medicine or pharmaceuticals.
               Life science oriented companies also include companies that the
               portfolio manager believes have growth potential primarily as a
               result of particular products, technology, patents or other
               market advantages in the life sciences. Life sciences encompass a
               variety of industries, including health care, nutrition,
               agriculture, medical
 
 22 Janus Equity Funds
<PAGE> 
 
               diagnostics, nuclear and biochemical research and development and
               health care facilities ownership and operation.
 
6. HOW DOES JANUS GLOBAL TECHNOLOGY FUND'S INDUSTRY POLICY DIFFER FROM THAT OF
   JANUS GLOBAL LIFE SCIENCES FUND?
 
               Unlike Janus Global Life Sciences Fund, Janus Global Technology
               Fund will not concentrate its investments in any particular
               industry or group of related industries. As a result, its
               portfolio manager may have more flexibility to find companies
               that he believes will benefit from advances or improvements in
               technology in a number of industries. Nevertheless, the Fund may
               hold a significant portion of its assets in industries such as:
               aerospace/ defense; biotechnology; computers; office/business
               equipment; semiconductors; software; telecommunications; and
               telecommunications equipment.
 
            Investment objectives, principal investment strategies and risks  23
<PAGE> 
 
COMBINATION FUNDS
 
               This section takes a closer look at the investment objectives of
               each of the Combination Funds, their principal investment
               strategies and certain risks of investing in the Combination
               Funds. 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 30-34 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
 
               JANUS BALANCED FUND
               Janus Balanced Fund 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 Fund normally invests at least 25% of its
               assets in fixed-income securities.
 
               JANUS EQUITY INCOME FUND
   
               Janus Equity Income Fund seeks current income and long-term
               growth of capital. It pursues its objective by normally
               emphasizing investments in common stocks, and growth potential is
               a significant investment consideration. The Fund tries to provide
               a lower level of volatility than the S&P 500 Index. Normally, it
               invests at least 65% of its assets in income-producing equity
               securities including common and preferred stocks, warrants and
               securities that are convertible to common or preferred stocks.
    
 
               JANUS GROWTH AND INCOME FUND
               Janus Growth and Income Fund seeks long-term capital growth and
               current income. It normally emphasizes investments in common
               stocks. It will normally invest up to 75% of its assets in equity
               securities selected primarily for their growth potential, and
 
 24 Janus Equity Funds
<PAGE> 
 
               at least 25% of its assets in securities the portfolio manager
               believes have income potential. Because of this investment
               strategy, the Fund is not designed for investors who need
               consistent income.
 
The following questions and answers are designed to help you better understand
the Combination Funds' principal investment strategies.
 
1. HOW DO THE COMBINATION FUNDS DIFFER FROM EACH OTHER?
 
               Janus Growth and Income Fund places a greater emphasis on
               aggressive growth stocks and may derive a greater portion of its
               income from dividend-paying common stocks. Because of these
               factors, its NAV can be expected to fluctuate more than the other
               Combination Funds. Although Janus Equity Income Fund invests
               substantially all of its assets in common stocks, it emphasizes
               investments in dividend-paying common stocks and other equity
               securities characterized by relatively greater price stability,
               and thus may be expected to be less volatile than Janus Growth
               and Income Fund, as discussed in more detail below. Janus
               Balanced Fund places a greater emphasis on the income component
               of its portfolio and invests to a greater degree in securities
               selected primarily for their income potential. As a result it is
               expected to be the least volatile of the Combination Funds.
 
2. HOW DOES JANUS EQUITY INCOME FUND TRY TO LIMIT PORTFOLIO VOLATILITY?
 
   
               Janus Equity Income Fund seeks to provide a lower level of
               volatility than the stock market at large, as measured by the S&P
               500 Index. The lower volatility sought by this Fund is expected
               to result primarily from investments in dividend-paying common
               stocks and other equity securities characterized by relatively
               greater price stability. The greater price stability sought by
               Janus Equity Income Fund may be characteristic of companies that
               generate above average free cash flows. A company may use free
               cash flows for a number of purposes including commencing or
               increasing dividend payments, repurchasing its own stock or
               retiring outstanding debt. The portfolio manager also considers
               growth potential in selecting this Fund's securities and may hold
               securities selected solely for their growth potential.
    
 
            Investment objectives, principal investment strategies and risks  25
<PAGE> 
 
3. HOW ARE COMMON STOCKS SELECTED FOR THE COMBINATION FUNDS IN COMPARISON TO THE
   GROWTH FUNDS?
 
               Because income is a part of the investment objective of the
               Combination Funds, a portfolio manager may consider dividend-
               paying characteristics to a greater degree in selecting common
               stocks for these Funds.
 
4. HOW ARE ASSETS ALLOCATED BETWEEN THE GROWTH AND INCOME COMPONENTS OF JANUS
   BALANCED FUND'S AND JANUS GROWTH AND INCOME FUND'S PORTFOLIOS?
 
               Janus Balanced Fund and Janus Growth and Income Fund shift assets
               between the growth and income components of their portfolios
               based on the portfolio managers' analysis of relevant market,
               financial and economic conditions. If a portfolio manager
               believes that growth securities will provide better returns than
               the yields then available or expected on income-producing
               securities, that Fund will place a greater emphasis on the growth
               component.
 
5. WHAT TYPES OF SECURITIES MAKE UP THE GROWTH COMPONENT OF THE COMBINATION
   FUNDS' PORTFOLIOS?
 
               The growth component of the Combination Funds' portfolios 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 JANUS BALANCED
   FUND'S AND JANUS GROWTH AND INCOME FUND'S PORTFOLIOS?
 
               The income component of Janus Balanced Fund and Janus Growth and
               Income Fund will consist of securities that a 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 a Fund if they currently pay dividends or a
               portfolio manager believes they have the potential for either
               increasing their dividends or commencing dividends, if none are
               currently paid.
 
 26 Janus Equity Funds
<PAGE> 
 
GENERAL PORTFOLIO POLICIES
 
               Unless otherwise stated, each of the following policies applies
               to all of the Funds. 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 Fund 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 Fund's 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 Funds' cash or similar investments may increase. In other
               words, the Funds 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 Fund'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 Funds may
               vary significantly.
 
               When a Fund'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 Fund remained more fully
               invested in stocks or bonds.
 
            Investment objectives, principal investment strategies and risks  27
<PAGE> 
 
               OTHER TYPES OF INVESTMENTS
               The Growth Funds 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 Combination Funds also invest in domestic and foreign
               equity securities with varying degrees of emphasis on income. The
               Funds 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 securities (less than 35% of each Fund's
                 assets)
    
 
   
               - options, futures, forwards 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
    
 
               ILLIQUID INVESTMENTS
               Each Fund 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 Funds' Trustees,
               certain restricted securities may be deemed liquid, and will not
               be counted toward this 15% limit.
 
               FOREIGN SECURITIES
               The Funds may invest without limit in foreign equity and debt
               securities. The Funds 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
 
 28 Janus Equity Funds
<PAGE> 
 
               include depositary receipts or shares, and passive foreign
               investment companies.
 
               SPECIAL SITUATIONS
               Each Fund may invest in special situations. A special situation
               arises when, in the opinion of a Fund's portfolio 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 Fund'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 Funds generally intend to purchase securities for long-term
               investment although, to a limited extent, a Fund 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 Fund 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 Fund's portfolio
               whenever its portfolio manager believes such changes are
               desirable. Portfolio turnover rates are generally not a factor in
               making buy and sell decisions.
 
               Janus Global Technology Fund may invest in companies with
               relatively short product cycles, for example, 6 to 9 months.
               Consequently, its portfolio turnover may be more frequent than
               other growth funds. 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.
 
            Investment objectives, principal investment strategies and risks  29
<PAGE> 
 
               Higher costs associated with increased portfolio turnover may
               offset gains in a Fund's performance.
 
RISKS
 
               Because the Funds 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 Fund's share price may
               also decrease. A Fund'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 or companies with relatively small market
               capitalizations. Janus Global Life Sciences Fund's and Janus
               Global Technology Fund's performance may also be affected by
               industry risk.
 
The following questions and answers are designed to help you better understand
some of the risks of investing in the Funds.
 
1. THE FUNDS MAY INVEST IN SMALLER OR NEWER COMPANIES. DOES THIS CREATE ANY
   SPECIAL RISKS?
 
               Particularly in the area of technology, 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.
 
 30 Janus Equity Funds
<PAGE> 
 
2. HOW DOES THE NONDIVERSIFIED STATUS OF JANUS ENTERPRISE FUND, JANUS OLYMPUS
   FUND, JANUS SPECIAL SITUATIONS FUND, JANUS TWENTY FUND, JANUS GLOBAL LIFE
   SCIENCES FUND AND JANUS GLOBAL TECHNOLOGY FUND AFFECT THEIR RISK?
 
               Diversification is a way to reduce risk by investing in a broad
               range of stocks or other securities. A "nondiversified" fund 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
               fund, its share price can be expected to fluctuate more than a
               comparable diversified fund. This fluctuation, if significant,
               may affect the performance of a Fund.
 
3. WHAT IS "INDUSTRY RISK"?
 
               Industry risk is the possibility that a group of related stocks
               will decline in price due to industry-specific developments.
               Companies in the same or similar industries may share common
               characteristics and are more likely to react similarly to
               industry-specific market or economic developments. In the life
               sciences, for example, many companies are subject to government
               regulation and approval of their products and services, which may
               affect their price or availability. In addition, the products and
               services offered by these companies may quickly become obsolete
               in the face of scientific or technological developments. The
               economic outlook of such companies may fluctuate dramatically due
               to changes in regulatory or competitive environments. In
               technology-related industries, competitive pressures may have a
               significant effect on the performance of companies in which Janus
               Global Technology Fund may invest. In addition, technology and
               technology-related companies often progress at an accelerated
               rate, and these companies may be subject to short product cycles
               and aggressive pricing which may increase their volatility.
 
               Janus Global Life Sciences Fund invests in a concentrated
               portfolio, which may result in greater exposure to related
               industries. As a result, the Fund may be more volatile than a
               less concentrated portfolio. Although Janus Global Technology
               Fund does not "concentrate" in a specific group of industries, it
               may at
 
            Investment objectives, principal investment strategies and risks  31
<PAGE> 
 
               times have significant exposure to companies in a variety of
               technology-related industries.
 
4. I'VE HEARD A LOT ABOUT HOW THE CHANGE TO THE YEAR 2000 COULD AFFECT COMPUTER
   SYSTEMS. DOES THIS CREATE ANY SPECIAL RISKS?
 
               The portfolio managers carefully research each potential
               investment before making an investment decision and, among other
               things, consider Year 2000 readiness when selecting portfolio
               holdings. However, there is no guarantee that the information a
               portfolio manager receives regarding a company's Year 2000
               readiness is completely accurate. If a company has not
               satisfactorily addressed Year 2000 issues, the Fund's performance
               could suffer.
 
5. HOW COULD THE FUNDS' INVESTMENTS IN FOREIGN SECURITIES AFFECT THEIR
   PERFORMANCE?
 
               The Funds 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 Funds' performance may depend on
               issues other than the performance of a particular company. These
               issues include:
 
               - CURRENCY RISK. As long as a Fund holds a foreign security, its
                 value will be affected by the value of the local currency
                 relative to the U.S. dollar. When a Fund 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,
 
 32 Janus Equity Funds
<PAGE> 
 
                 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 Fund's assets from that
                 country.
 
               - 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.
 
6. ARE THERE SPECIAL RISKS ASSOCIATED WITH INVESTMENTS IN HIGH-YIELD/HIGH-RISK
   SECURITIES?
 
   
               High-yield/high-risk securities (or "junk" bonds) are securities
               rated below investment grade by the primary rating agencies such
               as Standard & Poor's and Moody's. The value of lower quality
               securities generally is more dependent on credit risk, or the
               ability of the issuer to meet interest and principal payments,
               than investment grade debt securities. Issuers of high-yield
               securities 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.
    
 
               Please refer to the SAI for a description of bond rating
               categories.
 
            Investment objectives, principal investment strategies and risks  33
<PAGE> 
 
7. HOW DO THE FUNDS TRY TO REDUCE RISK?
 
               The Funds may use futures, options and other derivative
               instruments to "hedge" or protect their portfolios from adverse
               movements in securities prices and interest rates. The Funds may
               also use a variety of currency hedging techniques, including
               forward currency contracts, to manage exchange rate risk. The
               Funds believe the use of these instruments will benefit the
               Funds. However, a Fund's performance could be worse than if the
               Fund 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.
 
 34 Janus Equity Funds
<PAGE> 
 
                       This page intentionally left blank
 
                                                                              35
<PAGE> 
 
Janus Equity Funds
<PAGE> 
 
                   Shareholder's
                   Manual
 
                   This section will help you become
                   familiar with the different types
                   of accounts you can establish with
                   Janus. It also explains in detail
                   the wide array of services and
                   features you can establish on your
                   account, as well as account
                   policies and fees that may apply
                   to your account. Account policies
                   (including fees), services and
                   features may be modified or
                   discontinued without shareholder
                   approval or prior notice.
 
                                                    [JANUS LOGO]
<PAGE> 
 
HOW TO GET IN TOUCH WITH JANUS
 
               Janus offers two Investor Service Centers for those individuals
               who would like to conduct their investing in person. Our
               representatives will be happy to assist you at either of the
               following locations Monday-Friday 7:00 a.m. to 6:00 p.m. Mountain
               time and Saturday 9:00 a.m. to 1:00 p.m. Mountain time.
 
               100 Fillmore Street, Suite 100
               Denver, CO 80206
 
               3773 Cherry Creek North Drive, Suite 101
               Denver, CO 80209
 
   
 QUICK ADDRESS AND TELEPHONE REFERENCE
    
- --------------------------------------------------------------------------------
 
<TABLE>
  <S>                                           <C>
  MAILING ADDRESS                               JANUS XPRESSLINE(TM)
  Janus                                         1-888-979-7737
  P.O. Box 173375                               For 24-hour access to account
  Denver, CO 80217-3375                         and fund information,
                                                exchanges, purchases and
  FOR OVERNIGHT CARRIER                         redemptions, automated daily
  Janus                                         quotes on fund share prices,
  Suite 101                                     yields and total returns.
  3773 Cherry Creek North Drive
  Denver, CO 80209-3811                         TDD
                                                1-800-525-0056
  INVESTOR SERVICE REPRESENTATIVES              A telecommunications device
  If you have any questions while reading       for our hearing- and
  this Prospectus, please call one of our       speech-impaired shareholders.
  Investor Service Representatives at
  1-800-525-3713 Monday-Friday: 8:00            JANUS LITERATURE LINE
  a.m.-8:00 p.m., and Saturday: 10:00           1-800-525-8983
  a.m.-4:00 p.m., New York time.                To request a prospectus,
                                                shareholder reports or
  JANUS INTERNET ADDRESS                        marketing materials 24 hours a
  janus.com                                     day.
</TABLE>
 
 38 Janus Equity Funds
<PAGE> 
 
MINIMUM INVESTMENTS*
- ---------------------------------------------
 
<TABLE>
<S>                                 <C>
To open a new regular account        $2,500
To open a new retirement,
education or UGMA/UTMA account       $  500
To open a new regular account with
an Automatic Investment Program      $  500**
To add to any type of an account     $  100+
</TABLE>
 
 * The Funds reserve the right to
   change the amount of these
   minimums from time to time or
   to waive them in whole or in
   part for certain types of
   accounts.
** An Automatic Investment Program
   requires a $100 minimum
   automatic investment per month
   until the account balance
   reaches $2,500.
 + The minimum subsequent
   investment for IRA UGMA/UTMA
   accounts is $50.
 
TYPES OF ACCOUNT OWNERSHIP
 
               If you are investing in the Funds for the first time, you will
               need to establish an account. You can establish the following
               types of accounts by completing a New Account Application. To
               request an application, call 1-800-525-3713 or visit our Web site
               at janus.com to download an application.
 
               INDIVIDUAL OR JOINT OWNERSHIP
               Individual accounts are owned by one person. Joint accounts have
               two or more owners.
 
               A GIFT OR TRANSFER TO MINOR (UGMA OR UTMA)
               An UGMA/UTMA account is a custodial account managed for the
               benefit of a minor. To open an UGMA or UTMA account, you must
               include the minor's Social Security number on the application.
 
               TRUST
               An established trust can open an account. The names of each
               trustee, the name of the trust and the date of the trust
               agreement must be included on the application.
 
                                                        Shareholder's manual  39
<PAGE> 
 
               BUSINESS ACCOUNTS
               Corporations and partnerships may also open an account. The
               application must be signed by an authorized officer of the
               corporation or a general partner of the partnership.
 
TAX-DEFERRED ACCOUNTS
 
               If you are eligible, you may set up one or more tax-deferred
               accounts. A tax-deferred account allows you to shelter your
               investment income and capital gains from current income taxes. A
               contribution to certain of these plans may also be tax
               deductible. Tax-deferred accounts include retirement plans
               described below and the Education IRA. Distributions from these
               plans are generally subject to income tax and may be subject to
               an additional tax if withdrawn prior to age 59 1/2 or used for a
               nonqualifying purpose. Investors should consult their tax adviser
               or legal counsel before selecting a tax-deferred account.
 
   
               Investors Fiduciary Trust Company serves as custodian for the
               tax-deferred accounts offered by the Funds. You will be charged
               an annual account maintenance fee of $12 for each taxpayer
               identification number no matter how many tax-deferred accounts
               you have with Janus. You may pay the fee by check or have it
               automatically deducted from your account (usually in December).
               The custodian reserves the right to change the amount of this fee
               or to waive it in whole or in part for certain types of accounts.
    
 
               The following plans require a special application. For an
               application and more details about our Retirement Plans, call
               1-800-525-3713.
 
               TRADITIONAL AND ROTH INDIVIDUAL RETIREMENT ACCOUNTS
               Both types of IRAs allow most individuals with earned income to
               contribute up to the lesser of $2,000 ($4,000 for most married
               couples) or 100% of compensation annually. Please refer to the
               Janus IRA booklet for more complete information regarding the
               different types of IRAs.
 
 40 Janus Equity Funds
<PAGE> 
 
               EDUCATION IRA
               This plan allows individuals, subject to certain income
               limitations, to contribute up to $500 annually on behalf of any
               child under the age of 18. Please refer to the Janus IRA booklet
               for more complete information regarding the Education IRA.
 
               SIMPLIFIED EMPLOYEE PENSION PLAN
               This plan allows small business owners (including sole
               proprietors) to make tax-deductible contributions for themselves
               and any eligible employee(s). A SEP requires an IRA (a SEP-IRA)
               to be set up for each SEP participant.
 
               PROFIT SHARING OR MONEY PURCHASE PENSION PLAN
               These plans are open to corporations, partnerships and sole
               proprietors to benefit their employees and themselves.
 
               SECTION 403(B)(7) PLAN
               Employees of educational organizations or other qualifying, tax-
               exempt organizations may be eligible to participate in a Section
               403(b)(7) Plan.
 
HOW TO OPEN YOUR JANUS ACCOUNT
 
               Complete and sign the appropriate application. Please be sure to
               provide your Social Security or taxpayer identification number on
               the application and make your check payable to Janus. The Funds
               are available only to U.S. citizens or residents, and your
               application will be returned if you do not meet these criteria.
               Send all items to one of the addresses listed in the "Quick
               Address and Telephone Reference" on page 38.
 
                                                        Shareholder's manual  41
<PAGE> 
 
HOW TO PURCHASE SHARES
 
               PAYING FOR SHARES
 
               When you purchase shares, your request will be processed at the
               next NAV calculated after your order is received and accepted.
               Please note the following:
 
               - Cash, credit cards, third party checks and credit card checks
                 will not be accepted.
 
               - All purchases must be made in U.S. dollars.
 
               - Checks must be drawn on U.S. banks and made payable to Janus.
 
               - If a check does not clear your bank, the Funds reserve the
                 right to cancel the purchase.
 
               - If the Funds are unable to debit your predesignated bank
                 account on the day of purchase, they may make additional
                 attempts or cancel the purchase.
 
               - The Funds reserve the right to reject any specific purchase
                 request.
 
               If your purchase is cancelled, you will be responsible for any
               losses or fees imposed by your bank and losses that may be
               incurred as a result of any decline in the value of the cancelled
               purchase. The Funds (or their agents) have the authority to
               redeem shares in your account(s) to cover any losses due to
               fluctuations in share price. Any profit on such cancellation will
               accrue to the Fund.
 
               ONCE YOU HAVE OPENED YOUR JANUS ACCOUNT, THE MINIMUM AMOUNT FOR
               AN ADDITIONAL INVESTMENT IS $100 ($50 FOR IRAS OR UGMA/UTMA
               ACCOUNTS). You may add to your account at any time through any of
               the following options:
 
               BY MAIL
 
               Complete the remittance slip attached at the bottom of your
               confirmation statement. If you are making a purchase into a
 
 42 Janus Equity Funds
<PAGE> 
 
               retirement account, please indicate whether the purchase is a
               rollover or a current or prior year contribution. Send your check
               made payable to Janus and remittance slip or written instructions
               to one of the addresses listed previously. You may also request a
               booklet of remittance slips for non-retirement accounts.
 
               BY TELEPHONE
 
               This service allows you to purchase additional shares quickly and
               conveniently through an electronic transfer of money. To purchase
               shares by telephone, call an Investor Service Representative at
               1-800-525-3713 during normal business hours or call the Janus
               XpressLine, 1-888-979-7737, for access to this option 24 hours a
               day. When you make an additional purchase by telephone, Janus
               will automatically debit your predesignated bank account for the
               desired amount. To establish the telephone purchase option on
               your new account, complete the "Telephone Purchase of Shares
               Option" section on the application and attach a "voided" check or
               deposit slip from your bank account. If your account is already
               established, call 1-800-525-3713 to request the appropriate form.
               This option will become effective ten business days after the
               form is received.
 
               BY WIRE
 
               Purchases may also be made by wiring money from your bank account
               to your Janus account. Call 1-800-525-3713 to receive wiring
               instructions.
 
               BY INTERNET
 
               You must pre-establish the "Telephone Purchase of Shares Option"
               to make a purchase on our Web site at janus.com. If you have
               questions, please call 1-800-975-9932 to speak to a Janus
               representative.
 
                                                        Shareholder's manual  43
<PAGE> 
 
               AUTOMATIC INVESTMENT PROGRAMS
 
               Janus offers several automatic investment programs to help you
               achieve your financial goals as simply and conveniently as
               possible. You may open a new account with a $500 initial purchase
               and $100 automatic subsequent investments.
 
               AUTOMATIC MONTHLY INVESTMENT PROGRAM
               You select the day each month that your money ($100 minimum) will
               be electronically transferred from your bank account to your Fund
               account. To establish this option, complete the "Automatic
               Monthly Investment Program" section on the application and attach
               a "voided" check from your bank account. If your Fund account is
               already established, call 1-800-525-3713 to request the
               appropriate form.
 
               PAYROLL DEDUCTION
               If your employer can initiate an automatic payroll deduction, you
               may have all or a portion of your paycheck ($100 minimum)
               invested directly into your Fund account. To obtain information
               on establishing this option, call 1-800-525-3713.
 
               SYSTEMATIC EXCHANGE
               With a Systematic Exchange you determine the amount of money
               ($100 minimum) you would like automatically exchanged from one
               Janus account to another on any day of the month. For more
               information on how to establish this option, call 1-800-525-3713.
 
HOW TO EXCHANGE SHARES
 
               On any business day, you may exchange all or a portion of your
               shares into any other available Janus fund.
 
               IN WRITING
 
               To request an exchange in writing, please follow the instructions
               for written requests on page 48.
 
 44 Janus Equity Funds
<PAGE> 
 
               BY TELEPHONE
 
               All accounts are automatically eligible for the telephone
               exchange option. To exchange shares by telephone, call an
               Investor Service Representative at 1-800-525-3713 during normal
               business hours or call the Janus XpressLine, 1-888-979-7737, for
               access to this option 24 hours a day.
 
               BY SYSTEMATIC EXCHANGE
 
               As noted above, you may establish a Systematic Exchange for as
               little as $100 per month on established accounts. You may
               establish a new account with a $500 initial purchase and
               subsequent $100 systematic exchanges. If the balance in the
               account you are exchanging from falls below the systematic
               exchange amount, all remaining shares will be exchanged and the
               program will be discontinued.
 
               BY INTERNET
 
               Exchanges may also be made on our Web site at janus.com.
 
               EXCHANGE POLICIES
 
               - Except for Systematic Exchanges, new accounts established by
                 exchange must be opened with $2,500 or the total account value
                 if the value of the account you are exchanging from is less
                 than $2,500.
 
               - Exchanges between existing accounts must meet the $100
                 subsequent investment requirement.
 
   
               - You may make four exchanges out of each Fund during a calendar
                 year (exclusive of Systematic Exchanges). Exchanges in excess
                 of this limit may be subject to an exchange fee or may result
                 in termination of the exchange privilege.
    
 
               - The Funds reserve the right to reject any exchange request and
                 to modify or terminate the exchange privilege at any time. For
                 example, the Funds may reject exchanges from accounts engaged
 
                                                        Shareholder's manual  45
<PAGE> 
 
                 in or known to engage in trading in excess of the limit above
                 (including market timing transactions).
 
               - Exchanges between accounts will be accepted only if the
                 registrations are identical.
 
               - If the shares you are exchanging are held in certificate form,
                 you must return the certificate to your Fund prior to making
                 any exchanges.
 
               - Be sure that you read the prospectus for the fund into which
                 you are exchanging.
 
               - An exchange represents the sale of shares from one fund and the
                 purchase of shares of another fund, which may produce a taxable
                 gain or loss in a non-tax deferred account.
 
HOW TO REDEEM SHARES
 
   
               On any business day, you may redeem all or a portion of your
               shares. If the shares are held in certificate form, the
               certificate must be returned with or before your redemption
               request. Your transaction will be processed at the next NAV
               calculated after your order is received and accepted. The
               redemption may be suspended for 10 days following an address
               change unless a signature guarantee is provided.
    
 
               IN WRITING
 
               To request a redemption in writing, please follow the
               instructions for written requests on page 48.
 
               BY TELEPHONE
 
               Most accounts have the telephone redemption option, unless this
               option was specifically declined on the application or in
               writing. This option enables you to request redemptions daily
               from your account by calling 1-800-525-3713 by the close of the
               regular trading session of the New York Stock Exchange ("NYSE")
               normally 4:00 p.m. New York time. You may also use Janus
               XpressLine, 1-888-979-7737, for access to this option 24 hours a
 
 46 Janus Equity Funds
<PAGE> 
 
               day. (There is a daily limit of $100,000 per account for
               redemptions payable by check).
 
               BY INTERNET
 
               Redemptions may also be made on our Web site at janus.com.
 
               SYSTEMATIC REDEMPTION OPTION
 
               The Systematic Redemption Option allows you to redeem a specific
               dollar amount from your account on a regular basis. For more
               information or to request the appropriate form, please call
               1-800-525-3713.
 
PAYMENT OF REDEMPTION PROCEEDS
 
               BY CHECK
               Redemption proceeds will be sent to the shareholder(s) of record
               at the address of record within seven days after receipt of a
               valid redemption request.
 
               BY ELECTRONIC TRANSFER
               If you have established the electronic redemption option, your
               redemption proceeds can be electronically transferred to your
               predesignated bank account on the next bank business day after
               receipt of your redemption request (wire transfer) or the second
               bank business day after receipt of your redemption request (ACH
               transfer). Wire transfers will be charged an $8 fee per wire and
               your bank may charge an additional fee to receive the wire. ACH
               transfers are made free of charge. Wire redemptions are not
               available for retirement accounts.
 
               If you would like to establish the electronic redemption option
               on an existing account, please call 1-800-525-3713 to request the
               appropriate form.
 
               IF THE SHARES BEING REDEEMED WERE PURCHASED BY CHECK, TELEPHONE,
               ON OUR WEB SITE, OR THROUGH THE AUTOMATIC MONTHLY INVESTMENT
               PROGRAM, THE FUNDS MAY DELAY THE PAYMENT OF YOUR REDEMPTION
               PROCEEDS FOR UP TO 15 DAYS FROM THE DAY OF
 
                                                        Shareholder's manual  47
<PAGE> 
 
               PURCHASE TO ALLOW THE PURCHASE TO CLEAR. Unless you provide
               alternate instructions, your proceeds will be invested in Janus
               Money Market Fund - Investor Shares during the 15 day hold
               period.
 
WRITTEN INSTRUCTIONS
 
               To redeem or exchange all or part of your shares in writing, your
               request should be sent to one of the addresses listed on page 38
               and must include the following information:
 
               - the name of the Fund(s)
 
               - the account number(s)
 
               - the amount of money or number of shares being redeemed or
                 exchanged
 
               - the name(s) on the account
 
               - the signature(s) of all registered account owners
 
               - your daytime telephone number
 
               SIGNATURE REQUIREMENTS BASED ON ACCOUNT TYPE
 
               INDIVIDUAL, JOINT TENANTS, TENANTS IN COMMON
               Written instructions must be signed by each shareholder, exactly
               as the names appear in the account registration.
 
               UGMA OR UTMA
               Written instructions must be signed by the custodian in his/her
               capacity as it appears in the account registration.
 
               SOLE PROPRIETOR, GENERAL PARTNER
               Written instructions must be signed by an authorized individual
               in his/her capacity as it appears on the account registration.
 
               CORPORATION, ASSOCIATION
               Written instructions must be signed by the person(s) authorized
               to act on the account. In addition, a certified copy of the
               corporate
 
 48 Janus Equity Funds
<PAGE> 
 
               resolution authorizing the signer to act must accompany the
               request.
 
               TRUST
               Written instructions must be signed by the trustee(s). If the
               name of the current trustee(s) does not appear in the account
               registration, a certificate of incumbency dated within 60 days
               must also be submitted.
 
               IRA
               Written instructions must be signed by the account owner. If you
               do not want federal income tax withheld from your redemption, you
               must state that you elect not to have such withholding apply. In
               addition, your instructions must state whether the distribution
               is normal (after age 59 1/2) or premature (before age 59 1/2)
               and, if premature, whether any exceptions such as death or
               disability apply with regard to the 10% additional tax on early
               distributions.
 
SIGNATURE GUARANTEE
 
               In addition to the signature requirements, A SIGNATURE GUARANTEE
               IS ALSO REQUIRED if any of the following is applicable:
 
               - You request a redemption by check that exceeds $100,000.
 
               - You would like the check made payable to anyone other than the
                 shareholder(s) of record.
 
               - You would like the check mailed to an address which has been
                 changed within 10 days of the redemption request.
 
               - You would like the check mailed to an address other than the
                 address of record.
 
               THE FUNDS RESERVE THE RIGHT TO REQUIRE A SIGNATURE GUARANTEE
               UNDER OTHER CIRCUMSTANCES OR TO REJECT OR DELAY A REDEMPTION ON
               CERTAIN LEGAL GROUNDS. FOR MORE INFORMATION PERTAINING TO
               SIGNATURE GUARANTEES, PLEASE CALL 1-800-525-3713.
 
                                                        Shareholder's manual  49
<PAGE> 
 
               HOW TO OBTAIN A SIGNATURE GUARANTEE
 
               A signature guarantee assures that a signature is genuine. The
               signature guarantee protects shareholders from unauthorized
               account transfers. The following financial institutions may
               guarantee signatures: banks, savings and loan associations, trust
               companies, credit unions, broker-dealers, and member firms of a
               national securities exchange. Call your financial institution to
               see if they have the ability to guarantee a signature. A
               signature guarantee cannot be provided by a notary public.
 
               If you live outside the United States, a foreign bank properly
               authorized to do business in your country of residence or a U.S.
               consulate may be able to authenticate your signature.
 
PRICING OF FUND SHARES
 
               All purchases, redemptions and exchanges will be processed at the
               NAV next calculated after your request is received and accepted
               by a Fund (or a Fund's agent or authorized designee). A Fund's
               NAV is calculated at the close of the regular trading session of
               the NYSE (normally 4:00 p.m. New York time) each day that the
               NYSE is open. The NAV of Fund shares is not determined on days
               the NYSE is closed (generally New Year's Day, Martin Luther King
               Day, Presidents' Day, Good Friday, Memorial Day, Independence
               Day, Labor Day, Thanksgiving and Christmas). In order to receive
               a day's price, your order must be received by the close of the
               regular trading session of the NYSE. Securities 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.
 
 50 Janus Equity Funds
<PAGE> 
 
SHAREHOLDER SERVICES AND ACCOUNT POLICIES
 
               JANUS XPRESSLINE(TM)
 
               Janus XpressLine, our electronic telephone service, offers you
               24-hour access by TouchTone(TM) telephone to obtain information
               on account balances, Fund performance or dividends. You can also
               make exchanges, purchases and redemptions in existing accounts,
               request literature about any Janus fund, or order duplicate
               statements. Janus XpressLine is accessed by calling
               1-888-979-7737. Calls are limited to five minutes.
 
               JANUS WEB SITE
 
               Janus maintains a Web site located at JANUS.COM. You can
               purchase, exchange and redeem shares and access information such
               as your account balance and the Funds' NAVs through the Web site.
               In order to engage in transactions on our Web site, you must
               authorize us to transmit account information online and accept
               online instructions (see janus.com and follow the procedures
               accordingly). You may also need to have bank account information,
               wire instructions or other options established on your account.
               The Funds and their agents will not be responsible for any losses
               resulting from unauthorized transactions on our Web site when
               procedures designed for engaging in such transactions are
               followed. If you have questions, please call 1-800-975-9932 to
               speak to a Janus representative.
 
               ACCOUNT MINIMUMS
 
               Due to the proportionately higher costs of maintaining small
               accounts, Janus reserves the right to deduct a $10 minimum
               balance fee (or the value of the account if less than $10) from
               accounts with values below the minimums described on page 39 or
               to close such accounts. This policy will apply to accounts
               participating in the Automatic Monthly Investment Program only if
               your account balance does not reach the required minimum initial
               investment or falls below such minimum and you have discontinued
               monthly investments. This policy does not apply to
 
                                                        Shareholder's manual  51
<PAGE> 
 
               accounts that fall below the minimums solely as a result of
               market value fluctuations. It is expected that, for purposes of
               this policy, accounts will be valued in September, and the $10
               fee will be assessed on the second Friday of September of each
               year. You will receive notice before we charge the $10 fee or
               close your account so that you may increase your account balance
               to the required minimum.
 
               TRANSACTIONS THROUGH PROCESSING ORGANIZATIONS
 
               You may purchase or sell Fund shares through a broker-dealer,
               bank or other financial institution, or an organization that
               provides recordkeeping and consulting services to 401(k) plans or
               other employee benefit plans (a "Processing Organization").
               Processing Organizations may charge you a fee for this service
               and may require different minimum initial and subsequent
               investments than the Funds. Processing Organizations may also
               impose other charges or restrictions different from those
               applicable to shareholders who invest in the Funds directly. A
               Processing Organization, rather than its customers, may be the
               shareholder of record of your shares. The Funds are not
               responsible for the failure of any Processing Organization to
               carry out its obligations to its customers. Certain Processing
               Organizations may receive compensation from Janus Capital or its
               affiliates and certain Processing Organizations may receive
               compensation from the Funds for shareholder recordkeeping and
               similar services.
 
               TAXPAYER IDENTIFICATION NUMBER
 
               On the application or other appropriate form, you will be asked
               to certify that your Social Security or taxpayer identification
               number is correct and that you are not subject to backup
               withholding for failing to report income to the IRS. If you are
               subject to the 31% backup withholding or you did not certify your
               taxpayer identification number, the IRS requires the Funds to
               withhold 31% of any dividends paid and redemption or exchange
               proceeds. In addition to the 31% backup withholding, you may
 
 52 Janus Equity Funds
<PAGE> 
 
               be subject to a $50 fee to reimburse the Funds for any penalty
               that the IRS may impose.
 
               SHARE CERTIFICATES
 
   
               Most shareholders choose not to hold their shares in certificate
               form because account transactions such as exchanges and
               redemptions cannot be completed until the certificate has been
               returned to the Funds. The Funds will issue share certificates
               upon written request only and reserve the right to charge a fee
               for this service. Share certificates will not be issued until the
               shares have been held for at least 15 days and will not be issued
               for accounts that do not meet the minimum investment
               requirements. Share certificates cannot be issued for retirement
               accounts. In addition, if the certificate is lost, there may be a
               replacement charge.
    
 
               INVOLUNTARY REDEMPTIONS
 
               The Funds reserve the right to close an account if the
               shareholder is deemed to engage in activities which are illegal
               or otherwise believed to be detrimental to the Funds.
 
               TELEPHONE TRANSACTIONS
 
               You may initiate many transactions by telephone. The Funds and
               their agents will not be responsible for any losses resulting
               from unauthorized transactions when procedures designed to verify
               the identity of the caller are followed.
 
               It may be difficult to reach an Investor Service Representative
               by telephone during periods of unusual market activity. If you
               are unable to reach a representative by telephone, please
               consider sending written instructions, stopping by a Service
               Center, calling the Janus XpressLine or visiting our Web site.
 
               TEMPORARY SUSPENSION OF SERVICES
 
               The Funds or their agents may, in case of emergency, temporarily
               suspend telephone transactions and other shareholder services.
 
                                                        Shareholder's manual  53
<PAGE> 
 
               ADDRESS CHANGES
 
               To change the address on your account, call 1-800-525-3713 or
               send a written request signed by all account owners. Include the
               name of your Fund(s), the account number(s), the name(s) on the
               account and both the old and new addresses. Certain options may
               be suspended for 10 days following an address change unless a
               signature guarantee is provided.
 
               REGISTRATION CHANGES
 
               To change the name on an account, the shares are generally
               transferred to a new account. In some cases, legal documentation
               may be required. For more information, call 1-800-525-3713.
 
               STATEMENTS AND REPORTS
 
               Investors participating in an automatic investment program will
               receive quarterly confirmations of all transactions. In addition,
               the Funds will send you an immediate transaction confirmation
               statement after every non-systematic transaction. The Growth
               Funds distribute dividend information annually. The Combination
               Funds distribute dividend information quarterly.
 
   
               The Funds produce financial reports, which include a list of each
               of the Fund's portfolio holdings, semiannually and update their
               prospectus annually. To reduce expenses, the Funds may choose to
               mail only one report or prospectus to your household, even if
               more than one person in the household has a Fund account. Please
               call 1-800-525-3713 if you would like to receive additional
               reports or prospectuses. The Funds reserve the right to charge a
               fee for additional statement and report requests.
    
 
 54 Janus Equity Funds
<PAGE> 
                                                         Management of the funds
 
INVESTMENT ADVISER
 
               Janus Capital Corporation, 100 Fillmore Street, Denver, Colorado
               80206-4928, is the investment adviser to each of the Funds and is
               responsible for the day-to-day management of their investment
               portfolios and other business affairs of the Funds.
 
               Janus Capital began serving as investment adviser to Janus Fund
               in 1970 and currently serves as investment adviser to all of the
               Janus 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 the Funds' investments. Janus Capital also furnishes
               certain administrative, compliance and accounting services for
               the Funds, and may be reimbursed by the Funds 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 Funds and pays the salaries, fees and expenses of
               all Fund officers and those Trustees who are affiliated with
               Janus Capital.
 
MANAGEMENT EXPENSES
 
               The Funds pay Janus Capital a management fee which is calculated
               daily and paid monthly. The advisory agreement with the Funds
               spells out the management fee and other expenses that the Funds
               must pay. Each of the Funds is subject to the following
               management fee schedule (expressed as an annual rate):
 
<TABLE>
<CAPTION>
                   Average Daily Net Assets of Funds    Annual Rate Percentage (%)
- ----------------------------------------------------------------------------------
                <S>                                     <C>                
                   First $300 Million                                  0.75
                   Next $200 Million                                   0.70
                   Over $500 Million                                   0.65
- ----------------------------------------------------------------------------------
</TABLE>
 
 
               Each Fund incurs expenses not assumed by Janus Capital including
               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. The Annual Fund Operating Expenses
               table on page 17 lists the actual management fees and total
               operating expenses of each Fund for the most recent fiscal year.
 
                                                     Management of the funds  55
<PAGE> 
 
INVESTMENT PERSONNEL
 
PORTFOLIO MANAGERS
 
DAVID J. CORKINS
- --------------------------------------------------------------------------------
                   is Executive Vice President and portfolio manager of Janus
                   Growth and Income Fund which he has managed since August
                   1997. He previously served as an assistant portfolio
                   manager of Janus Mercury Fund. He joined Janus Capital in
                   1995 as a research analyst specializing in domestic
                   financial services companies and a variety of foreign
                   industries. Prior to joining Janus he was the Chief
                   Financial Officer of Chase U.S. Consumer Services, Inc., a
                   Chase Manhattan mortgage business. He holds a Bachelor of
                   Arts in English and Russian from Dartmouth and received
                   his Master of Business Administration from Columbia
                   University in 1993.
 
JAMES P. CRAIG, III
- --------------------------------------------------------------------------------
                   is Chief Investment Officer of Janus Capital. He is
                   Executive Vice President and portfolio manager of Janus
                   Fund, which he has managed since 1986. He is also
                   Executive Vice President and a co-manager of Janus Venture
                   Fund, which he has managed since February 1, 1997. Mr.
                   Craig previously managed Janus Balanced Fund from December
                   1993 to December 1995. He holds a Bachelor of Arts in
                   Business from the University of Alabama and a Master of
                   Arts in Finance from the Wharton School of the University
                   of Pennsylvania.
 
DAVID C. DECKER
- --------------------------------------------------------------------------------
                   is Executive Vice President and portfolio manager of Janus
                   Special Situations Fund, which he has managed since
                   inception, and an assistant portfolio manager of Janus
                   Fund. He joined Janus Capital in 1992 as a research
                   analyst and focused on companies in the automotive and
                   defense industries prior to managing Janus Special
                   Situations Fund.
 
 56 Janus Equity Funds
<PAGE> 
 
                   He obtained his Master 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
                   received the Chartered Financial Analyst designation.
 
JAMES P. GOFF
- --------------------------------------------------------------------------------
                   is Executive Vice President and portfolio manager of Janus
                   Enterprise Fund. Mr. Goff joined Janus Capital in 1988 and
                   has managed Janus Enterprise Fund since its inception. Mr.
                   Goff managed or co-managed Janus Venture Fund from
                   December 1993 to February 1, 1997. He holds a Bachelor of
                   Arts in Economics from Yale University and received the
                   Chartered Financial Analyst designation.
 
HELEN YOUNG HAYES
- --------------------------------------------------------------------------------
                   is Executive Vice President and portfolio manager of Janus
                   Worldwide Fund. She is also Executive Vice President and
                   co-manager of Janus Overseas Fund. 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 received the Chartered Financial
                   Analyst designation.
 
WARREN B. LAMMERT
- --------------------------------------------------------------------------------
                   is Executive Vice President and portfolio manager of Janus
                   Mercury Fund. Mr. Lammert joined Janus Capital in 1987 and
                   has managed Janus Mercury Fund since its inception. He
                   previously co-managed Janus Venture Fund from December
                   1993 to December 1996. He holds a Bachelor of Arts in
                   Economics from Yale University and a Master of Science in
                   Economic History from the London School of Economics. Mr.
                   Lammert received the Chartered Financial Analyst
                   designation.
 
                                                     Management of the funds  57
<PAGE> 
 
C. MIKE LU
- --------------------------------------------------------------------------------
                   is Executive Vice President and portfolio manager of Janus
                   Global Technology Fund, which he has managed since
                   inception. He joined Janus Capital in 1991 as a research
                   analyst and has consistently focused on companies in the
                   technology industry. Mr. Lu has a Bachelor of Arts in
                   History and a Bachelor of Arts in Economics from Yale
                   University. Mr. Lu received the Chartered Financial
                   Analyst designation.
 
THOMAS R. MALLEY
- --------------------------------------------------------------------------------
                   is Executive Vice President and portfolio manager of Janus
                   Global Life Sciences Fund, which he has managed since
                   inception. He joined Janus Capital in 1991 as a research
                   analyst and has focused on companies in the health care,
                   pharmaceutical and biotechnology industries. Mr. Malley
                   has a Bachelor of Science in Biology from Stanford
                   University and received the Chartered Financial Analyst
                   designation.
 
BLAINE P. ROLLINS
- --------------------------------------------------------------------------------
                   is Executive Vice President and portfolio manager of Janus
                   Balanced Fund, which he has managed since January 1996,
                   and Janus Equity Income Fund, which he has managed since
                   inception. He is an assistant portfolio manager of Janus
                   Fund. Mr. Rollins joined Janus Capital in 1990 and gained
                   experience as a fixed-income trader and equity research
                   analyst prior to managing Janus Balanced Fund. He holds a
                   Bachelor of Science in Finance from the University of
                   Colorado and received the Chartered Financial Analyst
                   designation.
 
SCOTT W. SCHOELZEL
- --------------------------------------------------------------------------------
                   is Executive Vice President and 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
 
 58 Janus Equity Funds
<PAGE> 
 
                   January 1994. He holds a Bachelor of Arts in Business from
                   Colorado College.
 
CLAIRE YOUNG
- --------------------------------------------------------------------------------
                   is Executive Vice President and portfolio manager of Janus
                   Olympus Fund which she has managed since August 1997. She
                   previously served as an assistant portfolio manager of
                   Janus Growth and Income Fund and Janus Twenty Fund. Ms.
                   Young joined Janus Capital in January 1992. She holds a
                   Bachelor of Science in Electrical Engineering from Yale
                   University and received the Chartered Financial Analyst
                   designation.
 
ASSISTANT PORTFOLIO MANAGERS
 
LAURENCE J. CHANG
- --------------------------------------------------------------------------------
                   is assistant portfolio manager of Janus Worldwide Fund. He
                   is also Executive Vice President and co-manager of Janus
                   Overseas Fund. Mr. Chang joined Janus Capital in 1993 as a
                   research analyst. He received an undergraduate degree with
                   honors in Religion and Philosophy from Dartmouth College
                   and a Master's Degree in Political Science from Stanford
                   University. Mr. Chang received the Chartered Financial
                   Analyst designation.
 
KAREN L. REIDY
- --------------------------------------------------------------------------------
   
                   is an assistant portfolio manager of Janus Fund. Prior to
                   joining Janus Capital in 1995, she worked for Price
                   Waterhouse in the Mergers and Acquisitions area,
                   performing corporate due diligence, and as an audit
                   senior, analyzing financials for corporate clients. She
                   received an undergraduate degree in Accounting from the
                   University of Colorado. She is seeking the Chartered
                   Financial Analyst designation.
    
 
                                                     Management of the funds  59
<PAGE> 
Other information
 
               SIZE OF FUNDS
 
               Although there is no present intention to do so, the Funds may
               discontinue sales of their shares if management and the Trustees
               believe that continued sales may adversely affect a Fund's
               ability to achieve its investment objective. If sales of a Fund
               are discontinued, it is expected that existing shareholders of
               that Fund would be permitted to continue to purchase shares and
               to reinvest any dividends or capital gains distributions, absent
               highly unusual circumstances.
 
               YEAR 2000
 
               Preparing for Year 2000 is a high priority for Janus Capital,
               which has established a dedicated group to address this issue.
               Janus Capital has devoted considerable internal resources and has
               engaged one of the foremost experts in the field to help achieve
               Year 2000 readiness. Janus Capital does not anticipate that Year
               2000-related issues will have a material impact on its ability to
               continue to provide the Funds with service at current levels;
               however, Janus Capital cannot make any assurances that the steps
               it has taken to ensure Year 2000 readiness will be successful. In
               addition, there can be no assurance that Year 2000 issues will
               not affect the companies in which the Funds invest or worldwide
               markets and economies.
 
 60 Janus Equity Funds
<PAGE> 
                                                         Distributions and taxes
 
DISTRIBUTIONS
 
   
               To avoid taxation of the Funds, the Internal Revenue Code
               requires each Fund to distribute net income and any net capital
               gains realized on its investments annually. A Fund'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.
    
 
DISTRIBUTION SCHEDULE
 
<TABLE>
<CAPTION>
                                       Dividends                          Capital Gains
                <S>                    <C>                                <C>
                Growth Funds           Normally declared and paid in      Normally declared and paid in
                                       December                           December
                ---------------------------------------------------------------------------------------
                Combination            Normally declared and paid in      Normally declared and paid in
                  Funds                March, June, September and         December
                                       December
</TABLE>
 
               HOW DISTRIBUTIONS AFFECT A FUND'S NAV
 
               Distributions are paid to shareholders as of the record date of a
               distribution of a Fund, regardless of how long the shares have
               been held. Dividends and capital gains awaiting distribution are
               included in each Fund's daily NAV. The share price of a Fund
               drops by the amount of the distribution, net of any subsequent
               market fluctuations. As an example, assume that on December 31,
               Janus Fund declared a dividend in the amount of $0.25 per share.
               If Janus Fund's share price was $10.00 on December 30, the Fund's
               share price on December 31 would be $9.75, barring market
               fluctuations. Shareholders should be aware that distributions
               from a taxable mutual fund are not value-enhancing and may create
               income tax obligations.
 
               "BUYING A DIVIDEND"
 
               If you purchase shares of a Fund just before the distribution,
               you will pay the full price for the shares and receive a portion
               of the purchase price back as a taxable distribution. This is
               referred to as "buying a dividend." In the above example, if you
               bought shares on December 30, you would have paid $10.00 per
               share. On
 
                                                     Distributions and taxes  61
<PAGE> 
 
               December 31, the Fund would pay you $0.25 per share as a dividend
               and your shares would now be worth $9.75 per share. Unless your
               account is set up as a tax-deferred account, dividends paid to
               you would be included in your gross income for tax purposes, even
               though you may not have participated in the increase in NAV of
               the Fund, whether or not you reinvested the dividends.
 
DISTRIBUTION OPTIONS
 
               When you open an account, you must specify on your application
               how you want to receive your distributions. You may change your
               distribution option at any time by writing the Funds at one of
               the addresses on page 38 or calling 1-800-525-3713. The Funds
               offer the following options:
 
               1. REINVESTMENT OPTION. You may reinvest your income dividends
                  and capital gains distributions in additional shares. This
                  option is assigned automatically if no other choice is made.
 
               2. CASH OPTION. You may receive your income dividends and capital
                  gains distributions in cash.
 
               3. REINVEST AND CASH OPTION. You may receive either your income
                  dividends or capital gains distributions in cash and reinvest
                  the other in additional shares.
 
               4. REDIRECT OPTION. You may direct your dividends or capital
                  gains to purchase shares of another Janus fund.
 
               The Funds reserve the right to reinvest into your account
               undeliverable and uncashed dividend and distribution checks that
               remain outstanding for six months in shares of the applicable
               Fund at the NAV next computed after the check is cancelled.
               Subsequent distributions may also be reinvested.
 
 62 Janus Equity Funds
<PAGE> 
 
TAXES
 
               As with any investment, you should consider the tax consequences
               of investing in the Funds. Any time you sell or exchange shares
               of a fund in a taxable account, it is considered a taxable event.
               Depending on the purchase price and the sale price, you may have
               a gain or loss on the transaction. Any tax liabilities generated
               by your transactions are your responsibility.
 
               The following discussion does not apply to tax-deferred accounts,
               nor is it a complete analysis of the federal tax implications of
               investing in the Funds. You may wish to consult your own tax
               adviser. Additionally, state or local taxes may apply to your
               investment, depending upon the laws of your state of residence.
 
               TAXES ON DISTRIBUTIONS
 
               Dividends and distributions of the Funds are subject to federal
               income tax, regardless of whether the distribution is made in
               cash or reinvested in additional shares of a Fund. Distributions
               may be taxable at different rates depending on the length of time
               a Fund holds a security. In certain states, a portion of the
               dividends and distributions (depending on the sources of a Fund's
               income) may be exempt from state and local taxes. Information
               regarding the tax status of income dividends and capital gains
               distributions will be mailed to shareholders on or before January
               31st of each year. Account tax information will also be sent to
               the IRS.
 
               TAXATION OF THE FUNDS
 
               Dividends, interest, and some capital gains received by the Funds
               on foreign securities may be subject to tax withholding or other
               foreign taxes. The Funds 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 an election is not made, any foreign taxes paid or accrued
               will represent an expense to the Funds.
 
                                                     Distributions and taxes  63
<PAGE> 
 
               The Funds do not expect to pay federal income or excise taxes
               because they intend to meet certain requirements of the Internal
               Revenue Code. It is important that the Funds meet these
               requirements so that any earnings on your investment will not be
               taxed twice.
 
 64 Janus Equity Funds
<PAGE> 
                                                                       
                                                            Financial highlights
 
   
               The financial highlights tables are intended to help you
               understand the Funds' financial performance for the past 5 years
               through October 31st of each fiscal year shown (or for Funds with
               a performance history shorter than 5 years, through October 31st
               of each fiscal period shown). Items 1 through 9 reflect financial
               results for a single Fund share. The total returns in the tables
               represent the rate that an investor would have earned (or lost)
               on an investment in each of the Funds (assuming reinvestment of
               all dividends and distributions). This information has been
               audited by PricewaterhouseCoopers LLP, whose report, along with
               the Funds' financial statements, are included in the Annual
               Reports, which are available upon request and incorporated by
               reference into the SAI.
    
 
               FINANCIAL HIGHLIGHTS ARE NOT PRESENTED FOR JANUS GLOBAL LIFE
               SCIENCES FUND AND JANUS GLOBAL TECHNOLOGY FUND BECAUSE THESE
               FUNDS DID NOT COMMENCE OPERATIONS UNTIL DECEMBER 31, 1998.
 
                                                        Financial highlights  65
<PAGE> 
 
   
<TABLE>
<CAPTION>
JANUS FUND
- ----------------------------------------------------------------------------------------------------
                                                            Periods ending October 31st
                                                  1998       1997       1996       1995       1994
<S>                                             <C>        <C>        <C>        <C>        <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD        $29.36     $26.65     $23.37     $19.62     $20.81
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                        (.02)       0.15       0.31       0.16       0.17
  3. Net gains or (losses) on securities (both
     realized and unrealized)                      3.70       5.69       4.23       3.99     (0.03)
  4. Total from investment operations              3.68       5.84       4.54       4.15       0.14
     LESS DISTRIBUTIONS:
  5. Dividends (from net investment income)      (0.23)     (0.21)     (0.13)     (0.01)     (0.39)
  6. Dividends (in excess of net investment
     income)                                         --         --         --         --         --
  7. Distributions (from capital gains)          (4.84)     (2.92)     (1.13)     (0.39)     (0.94)
  8. Total distributions                         (5.07)     (3.13)     (1.26)     (0.40)     (1.33)
  9. NET ASSET VALUE, END OF PERIOD              $27.97     $29.36     $26.65     $23.37     $19.62
 10. Total return                                15.12%     24.18%     20.31%     21.62%      0.75%
 11. Net assets, end of period (in millions)    $20,721    $19,029    $15,313    $11,963     $9,647
 12. Average net assets for the period (in
     millions)                                  $20,777    $17,515    $13,753    $10,560     $9,339
 13. Ratio of gross expenses to average net
     assets                                       0.87%      0.87%      0.86%      0.87%        N/A
 14. Ratio of net expenses to average net
     assets                                       0.86%      0.86%      0.85%      0.86%      0.91%
 15. Ratio of net investment income/(loss) to
     average net assets                              --      0.85%      0.91%      1.25%      1.12%
 16. Portfolio turnover rate                        70%       132%       104%       118%       139%
- ------------------------------------------------------------------------------------
</TABLE>
    
 
 66 Janus Equity Funds
<PAGE> 
 
   
<TABLE>
<CAPTION>
JANUS ENTERPRISE FUND
- ------------------------------------------------------------------------------------------------
                                                        Periods ending October 31st
                                              1998       1997       1996       1995       1994
<S>                                         <C>        <C>        <C>        <C>        <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD    $30.86     $31.19     $27.14     $24.43     $21.87
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                       --         --         --       0.52     (0.06)
  3. Net gains or (losses) on securities
     (both realized and unrealized)            3.43       0.95       5.85       3.09       3.18
  4. Total from investment operations          3.43       0.95       5.85       3.61       3.12
     LESS DISTRIBUTIONS:
  5. Dividends (from net investment
     income)                                     --         --         --     (0.52)     (0.02)
  6. Dividends (in excess of net
     investment income)                          --         --         --         --         --
  7. Distributions (from capital gains)      (1.96)     (1.28)     (1.80)     (0.38)     (0.54)
  8. Total distributions                     (1.96)     (1.28)     (1.80)     (0.90)     (0.56)
  9. NET ASSET VALUE, END OF PERIOD          $32.33     $30.86     $31.19     $27.14     $24.43
 10. Total return                            11.79%      3.31%     22.43%     15.46%     14.56%
 11. Net assets, end of period (in
     millions)                                 $559       $552       $732       $459       $370
 12. Average net assets for the period (in
     millions)                                 $551       $614       $596       $408       $270
 13. Ratio of gross expenses to average
     net assets                               1.08%      1.07%      1.14%      1.26%        N/A
 14. Ratio of net expenses to average net
     assets                                   1.06%      1.04%      1.12%      1.23%      1.25%
 15. Ratio of net investment income/(loss)
     to average net assets                  (0.67%)    (0.61%)    (0.78%)      0.02%    (0.32%)
 16. Portfolio turnover rate                   134%       111%        93%       194%       193%
- ------------------------------------------------------------------------------------------------
</TABLE>
    
 
                                                        Financial highlights  67
<PAGE> 
 
   
<TABLE>
<CAPTION>
JANUS MERCURY FUND
- ------------------------------------------------------------------------------------------------
                                                        Periods ending October 31st
                                              1998       1997       1996       1995       1994
<S>                                         <C>        <C>        <C>        <C>        <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD    $18.65     $18.20     $17.38     $14.12     $11.70
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                   (0.01)     (0.01)       0.14       0.16       0.02
  3. Net gains or (losses) on securities
     (both realized and unrealized)            4.07       2.82       2.74       3.37       2.40
  4. Total from investment operations          4.06       2.81       2.88       3.53       2.42
     LESS DISTRIBUTIONS:
  5. Dividends (from net investment
     income)                                     --     (0.08)         --     (0.16)         --
  6. Dividends (in excess of net
     investment income)                      (0.04)         --         --         --         --
  7. Distributions (from capital gains)      (1.90)     (2.28)     (2.06)     (0.11)         --
  8. Total distributions                     (1.94)     (2.36)     (2.06)     (0.27)         --
  9. NET ASSET VALUE, END OF PERIOD          $20.77     $18.65     $18.20     $17.38     $14.12
 10. Total return                            24.75%     17.07%     18.18%     25.53%     20.68%
 11. Net assets, end of period (in
     millions)                               $2,368     $1,971     $2,002     $1,521       $596
 12. Average net assets for the period (in
     millions)                               $2,103     $2,046     $1,839     $1,116       $258
 13. Ratio of gross expenses to average
     net assets                               0.97%      0.98%      1.02%      1.14%        N/A
 14. Ratio of net expenses to average net
     assets                                   0.94%      0.96%      1.00%      1.12%      1.33%
 15. Ratio of net investment income/(loss)
     to average net assets                  (0.33%)      0.21%      0.45%      0.50%      0.25%
 16. Portfolio turnover rate                   105%       157%       177%       201%       283%
- ------------------------------------------------------------------------------------------------
</TABLE>
    
 
 68 Janus Equity Funds
<PAGE> 
 
   
<TABLE>
<CAPTION>
JANUS OLYMPUS FUND
- -------------------------------------------------------------------------------------------
                                                             Periods ending October 31st
                                                             1998        1997      1996(1)
<S>                                                        <C>         <C>         <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD                   $18.41      $14.86      $12.00
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                                      --        0.04        0.13
  3. Net gains or (losses) on securities (both realized
     and unrealized)                                          4.05        3.64        2.73
  4. Total from investment operations                         4.05        3.68        2.86
     LESS DISTRIBUTIONS:
  5. Dividends (from net investment income)                     --      (0.13)          --
  6. Dividends (in excess of net investment income)         (0.04)          --          --
  7. Distributions (from capital gains)                     (0.72)          --          --
  8. Total distributions                                    (0.76)      (0.13)          --
  9. NET ASSET VALUE, END OF PERIOD                         $21.70      $18.41      $14.86
 10. Total return*                                          23.10%      24.98%      23.83%
 11. Net assets, end of period (in millions)                  $947        $616        $432
 12. Average net assets for the period (in millions)          $774        $517        $276
 13. Ratio of gross expenses to average net assets**         1.01%       1.06%       1.17%
 14. Ratio of net expenses to average net assets**           0.98%       1.03%       1.15%
 15. Ratio of net investment income/(loss) to average
     net assets**                                          (0.21%)       0.26%       1.64%
 16. Portfolio turnover rate**                                123%        244%        303%
- -------------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Fiscal period from December 29, 1995 (inception) to October 31, 1996.
 * Total return is not annualized for periods of less than one full year.
** Annualized for periods of less than one full year.
 
                                                        Financial highlights  69
<PAGE> 
 
   
<TABLE>
<CAPTION>
JANUS SPECIAL SITUATIONS FUND
- ------------------------------------------------------------------------------------
                                                                   Periods ending
                                                                    October 31st
                                                                  1998      1997(1)
<S>                                                             <C>         <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD                        $14.08      $10.00
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                                           --          --
  3. Net gains or (losses) on securities (both realized and
     unrealized)                                                   1.15        4.08
  4. Total from investment operations                              1.15        4.08
     LESS DISTRIBUTIONS:
  5. Dividends (from net investment income)                          --          --
  6. Dividends (in excess of net investment income)                  --          --
  7. Distributions (from capital gains)                          (0.66)          --
  8. Total distributions                                         (0.66)          --
  9. NET ASSET VALUE, END OF PERIOD                              $14.57      $14.08
 10. Total return*                                                8.49%      40.80%
 11. Net assets, end of period (in millions)                       $786        $334
 12. Average net assets for the period (in millions)               $716        $168
 13. Ratio of gross expenses to average net assets**              1.08%       1.20%
 14. Ratio of net expenses to average net assets**                1.05%       1.18%
 15. Ratio of net investment income/(loss) to average net
     assets**                                                   (0.49%)     (0.08%)
 16. Portfolio turnover rate**                                     117%        146%
- ------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Fiscal period from December 31, 1996 (inception) to October 31, 1997.
   
 * Total return is not annualized for periods of less than one full year.
    
   
** Annualized for periods of less than one full year.
    
 
 70 Janus Equity Funds
<PAGE> 
 
   
<TABLE>
<CAPTION>
JANUS TWENTY FUND
- ------------------------------------------------------------------------------------------------
                                                        Periods ending October 31st
                                              1998       1997       1996       1995       1994
<S>                                         <C>        <C>        <C>        <C>        <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD    $35.16     $31.90     $30.12     $24.24     $25.85
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                     0.12     (0.09)       0.37       0.01       0.16
  3. Net gains or (losses) on securities
     (both realized and unrealized)           12.26       8.85       6.68       5.94     (1.07)
  4. Total from investment operations         12.38       8.76       7.05       5.95     (0.91)
     LESS DISTRIBUTIONS:
  5. Dividends (from net investment
     income)                                 (0.10)     (0.18)         --     (0.07)     (0.25)
  6. Dividends (in excess of net
     investment income)                          --         --         --         --         --
  7. Distributions (from capital gains)      (4.46)     (5.32)     (5.27)         --     (0.45)
  8. Total distributions                     (4.56)     (5.50)     (5.27)     (0.07)     (0.70)
  9. NET ASSET VALUE, END OF PERIOD          $42.98     $35.16     $31.90     $30.12     $24.24
 10. Total return                            40.58%     31.65%     27.59%     24.67%    (3.52%)
 11. Net assets, end of period (in
     millions)                              $11,255     $5,871     $3,937     $2,996     $2,743
 12. Average net assets for the period (in
     millions)                               $8,025     $4,990     $3,386     $2,716     $3,051
 13. Ratio of gross expenses to average
     net assets                               0.91%      0.93%      0.93%      1.00%        N/A
 14. Ratio of net expenses to average net
     assets                                   0.90%      0.91%      0.92%      0.99%      1.02%
 15. Ratio of net investment income/(loss)
     to average net assets                    0.39%      0.33%      0.67%      0.62%      0.57%
 16. Portfolio turnover rate                    54%       123%       137%       147%       102%
- ------------------------------------------------------------------------------------------------
</TABLE>
    
 
                                                        Financial highlights  71
<PAGE> 
 
   
<TABLE>
<CAPTION>
JANUS WORLDWIDE FUND
- ----------------------------------------------------------------------------------------
                                                    Periods ending October 31st
                                             1998      1997      1996     1995     1994
<S>                                         <C>       <C>       <C>      <C>      <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD    $40.05    $34.60   $27.65   $27.00   $24.16
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                     1.26    (0.08)     0.49     0.81     0.15
  3. Net gains or (losses) on securities
     (both realized and unrealized)            3.01      7.73     7.79     1.39     3.34
  4. Total from investment operations          4.27      7.65     8.28     2.20     3.49
     LESS DISTRIBUTIONS:
  5. Dividends (from net investment
     income)                                 (1.35)    (0.15)   (0.26)   (0.54)   (0.27)
  6. Dividends (in excess of net
     investment income)                          --        --       --       --       --
  7. Distributions (from capital gains)      (1.45)    (2.05)   (1.07)   (1.01)   (0.38)
  8. Total distributions                     (2.80)    (2.20)   (1.33)   (1.55)   (0.65)
  9. NET ASSET VALUE, END OF PERIOD          $41.52    $40.05   $34.60   $27.65   $27.00
 10. Total return                            11.40%    23.34%   31.00%    8.89%   14.76%
 11. Net assets, end of period (in
     millions)                              $13,932   $10,358   $4,467   $1,804   $1,587
 12. Average net assets for the period (in
     millions)                              $13,078    $7,784   $2,953   $1,622   $1,244
 13. Ratio of gross expenses to average
     net assets                               0.92%     0.97%    1.02%    1.24%      N/A
 14. Ratio of net expenses to average net
     assets                                   0.90%     0.95%    1.01%    1.23%    1.12%
 15. Ratio of net investment income/(loss)
     to average net assets                    0.47%     0.65%    0.73%    0.99%    0.42%
 16. Portfolio turnover rate                    86%       79%      80%     142%     158%
- ----------------------------------------------------------------------------------------
</TABLE>
    
 
 72 Janus Equity Funds
<PAGE> 
 
   
<TABLE>
<CAPTION>
JANUS BALANCED FUND
- ------------------------------------------------------------------------------
                                                    Periods ending October 31st
                                              1998     1997     1996     1995     1994
<S>                                          <C>      <C>      <C>      <C>      <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD    $16.73   $15.20   $13.72   $12.17   $12.23
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                     0.33     0.36     0.33     0.61     0.27
  3. Net gains or (losses) on securities
     (both realized and unrealized)            2.00     2.88     2.22     1.52   (0.09)
  4. Total from investment operations          2.33     3.24     2.55     2.13     0.18
     LESS DISTRIBUTIONS:
  5. Dividends (from net investment income)  (0.35)   (0.36)   (0.26)   (0.58)   (0.24)
  6. Dividends (in excess of net investment
     income)                                     --       --       --       --       --
  7. Distributions (from capital gains)      (1.49)   (1.35)   (0.81)       --       --
  8. Total distributions                     (1.84)   (1.71)   (1.07)   (0.58)   (0.24)
  9. NET ASSET VALUE, END OF PERIOD          $17.22   $16.73   $15.20   $13.72   $12.17
 10. Total return                            15.48%   23.38%   19.39%   18.26%    1.51%
 11. Net assets, end of period (in
     millions)                                 $830     $360     $207     $125      $94
 12. Average net assets for the period (in
     millions)                                 $537     $283     $159     $107      $86
 13. Ratio of gross expenses to average net
     assets                                   1.03%    1.12%    1.23%    1.35%      N/A
 14. Ratio of net expenses to average net
     assets                                   1.01%    1.10%    1.21%    1.32%    1.42%
 15. Ratio of net investment income/(loss)
     to average net assets                    2.34%    2.63%    2.35%    2.52%    2.28%
 16. Portfolio turnover rate                    73%     139%     151%     185%     167%
- ---------------------------------------------------------------------------------------
</TABLE>
    
 
                                                        Financial highlights  73
<PAGE> 
 
   
<TABLE>
<CAPTION>
JANUS EQUITY INCOME FUND
- ----------------------------------------------------------------------------------------
                                                            Periods ending October 31st
                                                            1998       1997      1996(1)
<S>                                                        <C>        <C>        <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD                  $13.98     $11.29     $10.00
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                                   0.05       0.09       0.07
  3. Net gains or (losses) on securities (both realized
     and unrealized)                                         2.47       3.11       1.25
  4. Total from investment operations                        2.52       3.20       1.32
     LESS DISTRIBUTIONS:
  5. Dividends (from net investment income)                (0.03)     (0.12)     (0.03)
  6. Dividends (in excess of net investment income)            --         --         --
  7. Distributions (from capital gains)                    (0.88)     (0.39)         --
  8. Total distributions                                   (0.91)     (0.51)     (0.03)
  9. NET ASSET VALUE, END OF PERIOD                        $15.59     $13.98     $11.29
 10. Total return*                                         19.21%     29.46%     13.20%
 11. Net assets, end of period (in millions)                 $201        $74        $30
 12. Average net assets for the period (in millions)         $134        $46        $21
 13. Ratio of gross expenses to average net assets**        1.21%      1.48%      1.79%
 14. Ratio of net expenses to average net assets**          1.18%      1.45%      1.71%
 15. Ratio of net investment income/(loss) to average net
     assets**                                               0.41%      0.62%      3.09%
 16. Portfolio turnover rate**                               101%       180%       325%
- ----------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Fiscal period from June 28, 1996 (inception) to October 31, 1996.
 * Total return is not annualized for periods of less than one full year.
** Annualized for periods of less than one full year.
 
 74 Janus Equity Funds
<PAGE> 
 
   
<TABLE>
<CAPTION>
JANUS GROWTH AND INCOME FUND
- ---------------------------------------------------------------------------------------
                                                    Periods ending October 31st
                                              1998     1997     1996     1995     1994
<S>                                          <C>      <C>      <C>      <C>      <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD    $25.07   $20.05   $18.13   $14.69   $15.24
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                     0.08     0.01     0.16     0.11     0.19
  3. Net gains or (losses) on securities
     (both realized and unrealized)            3.72     6.98     4.01     3.43   (0.31)
  4. Total from investment operations          3.80     6.99     4.17     3.54   (0.12)
     LESS DISTRIBUTIONS:
  5. Dividends (from net investment income)  (0.04)   (0.11)   (0.08)   (0.10)   (0.10)
  6. Dividends (in excess of net investment
     income)                                     --       --       --       --       --
  7. Distributions (from capital gains)      (2.38)   (1.86)   (2.17)       --   (0.33)
  8. Total distributions                     (2.42)   (1.97)   (2.25)   (0.10)   (0.43)
  9. NET ASSET VALUE, END OF PERIOD          $26.45   $25.07   $20.05   $18.13   $14.69
 10. Total return                            16.73%   37.78%   25.56%   24.20%   (0.76%)
 11. Net assets, end of period (in
     millions)                               $2,819   $1,889   $1,033     $583     $490
 12. Average net assets for the period (in
     millions)                               $2,479   $1,416     $773     $498     $500
 13. Ratio of gross expenses to average net
     assets                                   0.96%    0.98%    1.05%    1.19%      N/A
 14. Ratio of net expenses to average net
     assets                                   0.94%    0.96%    1.03%    1.17%    1.22%
 15. Ratio of net investment income/(loss)
     to average net assets                    0.33%    0.30%    0.70%    1.11%    1.26%
 16. Portfolio turnover rate                    95%     127%     153%     195%     123%
- ---------------------------------------------------------------------------------------
</TABLE>
    
 
                                                        Financial highlights  75
<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 Funds may
               invest. The Funds may invest in these instruments to the extent
               permitted by their investment objectives and policies. The Funds
               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
               Funds 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 on 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
 
 76 Janus Equity Funds
<PAGE> 
 
               (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 SECURITIES are securities 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 securities 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 Funds
               must pay if these investments are profitable, the Funds may make
               various elections permitted by the tax laws. These elections
               could require that the Funds recognize taxable income, which in
               turn
 
                                                Glossary of investment terms  77
<PAGE> 
 
               must be distributed, before the securities are sold and before
               cash is received to pay the distributions.
 
               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
               Fund and a simultaneous agreement by the seller (generally a bank
               or dealer) to repurchase the security from the Fund 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 Fund 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
               Fund to another party (generally a bank or dealer) in return for
               cash and an agreement by the Fund 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.
 
               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.
 
 78 Janus Equity Funds
<PAGE> 
 
               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
               Funds 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.
 
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
               Funds 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 Funds 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 Funds
               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.
 
                                                Glossary of investment terms  79
<PAGE> 
 
               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 Fund bears the market
               risk of an investment in the underlying instruments, as well as
               the credit risk of the issuer.
 
               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 Funds may purchase and
               write put and call options on securities, securities indices and
               foreign currencies.
 
 80 Janus Equity Funds
<PAGE> 
 
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<PAGE> 
 
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 82
<PAGE> 
 
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<PAGE> 
 
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 84
<PAGE> 
 
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<PAGE> 
 
[JANUS LOGO]
          1-800-525-3713
          P.O. Box 173375
          Denver, Colorado 80217-3375
          janus.com
 
You can request other information, including a Statement of
Additional Information, Annual Report or Semiannual Report, free of
charge, by contacting Janus at 1-800-525-3713 or visiting our Web
site at janus.com. In the Funds' Annual Reports, you will find a
discussion of the market conditions and investment strategies that
significantly affected the Funds' performance during their last
fiscal year. Other information is also available from financial
intermediaries that sell shares of the Funds.
 
The Statement of Additional Information provides detailed
information about the Funds and is incorporated into this Prospectus
by reference. You may review the Funds' Statement of Additional
Information at the Public Reference Room of the SEC or get text only
copies for a fee, by writing to or calling the Public Reference
Room, Washington, D.C. 20549-6009 (1-800-SEC-0330). You may obtain
the Statement of Additional Information for free from the SEC's Web
site at http://www.sec.gov.
 
              Investment Company Act File No. 811-1879
 
  3164
<PAGE> 
                                  [JANUS LOGO]

 
                         Janus Income Funds
 
                                       PROSPECTUS
 
                                       FEBRUARY 17, 1999
                                       Janus Flexible Income Fund
                                       Janus High-Yield Fund
                                       Janus Federal Tax-Exempt Fund
                                       Janus Short-Term Bond Fund
                                       Janus Money Market Fund
                                       Janus Government Money Market Fund
                                       Janus Tax-Exempt Money Market Fund
 
                         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]
<PAGE> 
 
                                                               Table of contents
 
<TABLE>
                <S>                                               <C>
                RISK/RETURN SUMMARY
                   Fixed-income funds...........................    2
                   Money market funds...........................    7
                   Fees and expenses............................   10
                INVESTMENT OBJECTIVES, PRINCIPAL INVESTMENT
                STRATEGIES AND RISKS
                   Fixed income funds...........................   12
                   Money market funds...........................   22
                SHAREHOLDER'S MANUAL
                   Minimum investments..........................   33
                   Types of account ownership...................   33
                   How to open your Janus account...............   35
                   How to purchase shares.......................   36
                   How to exchange shares.......................   38
                   How to redeem shares.........................   40
                   Shareholder services and account policies....   46
                MANAGEMENT OF THE FUNDS
                   Investment adviser...........................   51
                   Investment personnel.........................   52
                OTHER INFORMATION............... ...............   55
                DISTRIBUTIONS AND TAXES
                   Distributions................................   56
                   Taxes........................................   59
                FINANCIAL HIGHLIGHTS.............. .............   61
                GLOSSARY
                   Glossary of investment terms.................   68
                RATING CATEGORIES
                   Explanation of rating categories.............   76
 
</TABLE>
 
                                                            Table of contents  1
<PAGE> 
Risk return summary
 
FIXED-INCOME FUNDS
 
               The Fixed-Income Funds are designed for long-term investors who
               primarily seek current income.
 
1. WHAT ARE THE INVESTMENT OBJECTIVES OF THE FIXED-INCOME FUNDS?
 
- --------------------------------------------------------------------------------
 
               - JANUS FLEXIBLE INCOME FUND seeks to obtain maximum total
                 return, consistent with preservation of capital.
 
               - JANUS HIGH-YIELD FUND seeks to obtain high current income.
                 Capital appreciation is a secondary objective when
                 consistent with its primary objective.
 
               - JANUS FEDERAL TAX-EXEMPT FUND seeks as high a level of
                 current income exempt from federal income tax as is
                 consistent with preservation of capital.
 
               - JANUS SHORT-TERM BOND FUND seeks as high a level of current
                 income as is consistent with preservation of capital.
 
               The Funds' Trustees may change these objectives without a
               shareholder vote and the Funds will notify you of any changes
               that are material. If there is a material change to a Fund's
               objective or policies, you should consider whether that Fund
               remains an appropriate investment for you. There is no guarantee
               that a Fund will meet its objective.
 
2. WHAT ARE THE MAIN INVESTMENT STRATEGIES OF THE FIXED-INCOME FUNDS?
 
   
               In addition to considering economic factors such as the effect of
               interest rates on the Fund's investments, the portfolio managers
               apply a "bottom up" approach in choosing investments. In other
               words, they look mostly for income-producing securities that meet
               their investment criteria one at a time. If a portfolio manager
               is unable to find such investments, a Fund's assets may be in
               cash or similar investments.
    
 
               JANUS FLEXIBLE INCOME FUND invests primarily in a wide variety of
               income-producing securities such as corporate bonds and notes,
               government securities and preferred stock. As a fundamental
 
 2 Janus Income Funds
<PAGE> 
 
               policy, the Fund will invest at least 80% of its assets in
               income-producing securities. The Fund may own an unlimited amount
               of high-yield/high-risk securities, and these securities may be a
               big part of the portfolio.
 
               JANUS HIGH-YIELD FUND normally invests at least 65% of its assets
               in high-yield/high-risk fixed-income securities, and may at times
               invest all of its assets in these securities.
 
               JANUS FEDERAL TAX-EXEMPT FUND invests primarily in municipal
               obligations of any maturity whose interest is exempt from federal
               income tax. As a fundamental policy, the Fund will normally
               invest at least 80% of its assets in securities whose interest is
               exempt from federal income tax, including the federal alternative
               minimum tax.
 
               JANUS SHORT-TERM BOND FUND invests primarily in short- and
               intermediate-term fixed-income securities. The Fund will normally
               invest at least 65% of its assets in debt securities such as
               corporate bonds or notes, or U.S. Treasury bonds, and may invest
               up to 35% of its assets in high-yield/high-risk securities.
               Normally, the Fund expects to maintain an average weighted
               effective maturity of three years or less.
 
3. WHAT ARE THE MAIN RISKS OF INVESTING IN THE FIXED-INCOME FUNDS?
 
               Although the Fixed-Income Funds may be less volatile than funds
               that invest most of their assets in common stocks, the Funds'
               returns and yields will vary, and you could lose money.
 
   
               The Funds invest 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
               Fund's net asset value (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.
    
 
               At times, JANUS FEDERAL TAX-EXEMPT FUND may invest more than 25%
               of its assets in tax-exempt securities related in such a way
 
                                                          Risk return summary  3
<PAGE> 
 
               that a negative economic, business or political development or
               change affecting the invested security could also negatively
               affect other securities in the same category.
 
               JANUS FLEXIBLE INCOME FUND AND JANUS HIGH-YIELD FUND may invest
               an unlimited amount of their assets in high-yield/high-risk
               securities, also known as "junk" bonds. JANUS FEDERAL TAX-EXEMPT
               FUND AND JANUS SHORT-TERM BOND FUND may invest up to 35% of their
               assets in high-yield/high-risk securities. Junk bonds may be
               sensitive to economic changes, political changes, or adverse
               developments specific to the company that issued the bond. These
               securities generally have a greater credit risk than other types
               of fixed-income securities. Because of these factors, the
               performance and NAV of the Fixed-Income Funds may vary
               significantly, depending upon their holdings of junk bonds.
 
   
               An investment in these Funds 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 illustrates how each Fixed-Income
               Fund's performance has varied over time. The bar charts depict
               the change in performance from year-to-year during the period
               indicated. The tables compare each Fund's average annual returns
               for the periods indicated to a broad-based securities market
               index.
 
 4 Janus Income Funds
<PAGE> 
 
                JANUS FLEXIBLE INCOME FUND

A BAR CHART showing Annual Total Returns for Janus Flexible Income Fund from
1989 through 1998:
 
   
                Annual returns for periods ended 12/31

4.12% (4.62%) 25.98%  11.85%  15.70%  (2.92%)  21.15%  6.88%  11.43%  8.84%
1989   1990    1991    1992    1993    1994     1995   1996    1997   1998

Each percentage is represented by a bar of proportionate size with the actual
total return printed above the bar.

                Best Quarter:  1st-1991 8.17%;  Worst Quarter:  1st-1990 (8.37%)
    

 
                          Average annual total return for periods ended 12/31/98
                       ---------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                                Since Inception
                                                 1 year   5 years   10 years       (7/7/87)
                <S>                          <C> <C>      <C>       <C>         <C>             <C>
                Janus Flexible Income Fund        8.84%    8.80%      9.46%          9.45%
                Lehman Brothers Gov't/Corp
                  Bond Index*                     9.47%    7.30%      9.33%          9.01%
                                             -----------------------------------------
</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.
 
                JANUS HIGH-YIELD FUND

A BAR CHART showing Annual Total Returns for Janus High-Yield Fund from 1996
through 1998. 

   
                Annual returns for periods ended 12/31

                          23.99%   15.47%   0.97%
                           1996     1997    1998

Each percentage is represented by a bar of proportionate size with the actual
total return printed above the bar.

                Best Quarter:  1st-1996 7.34%;  Worst Quarter:  3rd-1998 (5.76%)
    

                          Average annual total return for periods ended 12/31/98
                       ---------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                           Since Inception
                                                                  1 year     (12/29/95)
                <S>                                           <C> <C>      <C>             <C>
                Janus High-Yield Fund                              0.97%       13.07%
                Lehman Brothers High-Yield Bond Index+             1.60%        8.46%
                                                              ------------------------
</TABLE>
    
 
   
                + Lehman Brothers High-Yield Bond Index is composed of
                  fixed-rate, publicly issued, noninvestment grade debt.
    
 
                                                          Risk return summary  5
<PAGE> 
 
                JANUS FEDERAL TAX-EXEMPT FUND
 
A BAR CHART showing Annual Total Returns for Janus Federal Tax-Exempt Fund from
1994 through 1998:
   
                Annual returns for periods ended 12/31

                                        (7.77%)   15.84%   4.71%   8.98%   5.31%
                                         1994      1995    1996    1997    1998

Each percentage is represented by a bar of proportionate size with the actual 
total return printed above the bar

                Best Quarter: 1st-1995 6.66%; Worst Quarter: 1st-1994 (6.76%)
    

                          Average annual total return for periods ended 12/31/98
                       ---------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                            Since Inception
                                                         1 year   5 years      (5/3/93)
                <S>                                 <C>  <C>      <C>       <C>             <C>
                Janus Federal Tax-Exempt Fund             5.31%    5.13%         5.88%
                Lehman Brothers Municipal Bond
                  Index*                                  5.84%    6.10%         6.66%
                                                    ----------------------------------
</TABLE>
    
 
                * Lehman Brothers Municipal Bond Index is composed of
                  approximately 1,100 bonds; 60% of which are revenue bonds and
                  40% of which are state government obligations.
 
                JANUS SHORT-TERM BOND FUND

A BAR CHART showing Annual Total Returns for Janus Short-Term Bond Fund from 
1993 through 1998:
   
                Annual returns for periods ended 12/31


                                   6.18%   0.35%   7.95%   6.19%   6.61%   6.77%
                                   1993    1994    1995    1996    1997    1998

Each percentage is represented by a bar of proportionate size with the actual 
total return printed above the bar.

                Best Quarter: 4th-1996 3.25%; Worst Quarter: 1st-1994 (0.63%)
    
 
                         Average annual total return for periods ending 12/31/98
                      ----------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                             Since Inception
                                                          1 year   5 years      (9/1/92)
                <S>                                   <C> <C>      <C>       <C>             <C>
                Janus Short-Term Bond Fund                 6.77%    5.54%         5.41%
                Lehman Brothers Gov't/Corp 1-3 Year
                  Bond Index+                              6.96%    6.00%         5.80%
                                                      --------------------------------
</TABLE>
    
 
   
                + Lehman Brothers Gov't/Corp 1-3 Year Bond Index is composed of
                  all bonds of investment grade with a maturity between one and
                  three years.
    
 
               Call the Janus XpressLine(TM) at 1-888-979-7737 to obtain the
               Funds' yields.
 
               The Fixed-Income Funds' past performance does not necessarily
               indicate how they will perform in the future.
 
 6 Janus Income Funds
<PAGE> 
 
MONEY MARKET FUNDS
 
               The Money Market Funds are designed for investors who seek
               current income.
 
1. WHAT ARE THE INVESTMENT OBJECTIVES OF THE MONEY MARKET FUNDS?
 
- --------------------------------------------------------------------------------
 
               - JANUS MONEY MARKET FUND AND JANUS GOVERNMENT MONEY MARKET FUND
                 seek maximum current income to the extent consistent with
                 stability of capital.
 
               - JANUS TAX-EXEMPT MONEY MARKET FUND seeks maximum current income
                 that is exempt from federal income taxes to the extent
                 consistent with stability of capital.
 
               The Funds' Trustees may change these objectives without a
               shareholder vote and the Funds will notify you of any changes
               that are material. If there is a material change in a Fund's
               objective or policies, you should consider whether that Fund
               remains an appropriate investment for you. There is no guarantee
               that any Fund will meet its objective.
 
2. WHAT ARE THE MAIN INVESTMENT STRATEGIES OF THE MONEY MARKET FUNDS?
 
               The Money Market Funds will invest only in high-quality, short-
               term money market instruments that present minimal credit risks,
               as determined by Janus Capital.
 
               JANUS MONEY MARKET FUND invests primarily in high quality debt
               obligations and obligations of financial institutions. Debt
               obligations may include commercial paper, notes and bonds, and
               variable amount master demand notes. Obligations of financial
               institutions include certificates of deposit and time deposits.
 
               JANUS GOVERNMENT MONEY MARKET FUND invests exclusively in
               obligations issued and/or guaranteed as to principal and interest
               by the United States government or by its agencies and
               instrumentalities and repurchase agreements secured by such
               obligations.
 
                                                          Risk return summary  7
<PAGE> 
 
               JANUS TAX-EXEMPT MONEY MARKET FUND invests primarily in municipal
               securities whose interest is exempt from federal income taxes,
               including the federal alternative minimum tax. The Fund may
               invest up to 20% of its net assets in taxable securities and may
               invest without limit in cash and cash equivalents that may be
               federally taxable to the extent the portfolio manager cannot
               locate investment opportunities with desirable risk/reward
               characteristics.
 
3. WHAT ARE THE MAIN RISKS OF INVESTING IN THE MONEY MARKET FUNDS?
 
               The Funds' yields will vary as the short-term securities in their
               portfolios mature and the proceeds are reinvested in securities
               with different interest rates. Over time, the real value of a
               Fund's yield may be eroded by inflation. Although the Money
               Market Funds invest only in high-quality, short-term money market
               instruments, there is a risk that the value of the securities
               they hold will fall as a result of changes in interest rates, an
               issuer's actual or perceived credit-worthiness or an issuer's
               ability to meet its obligations.
 
               Economic, business, or political development or change affecting
               tax-exempt securities may affect Janus Tax-Exempt Money Market
               Fund's holdings similarly. This could result in increased
               variability of performance. Income from the Fund's investments
               may be taxable by your state or local government.
 
               An investment in the Money Market Funds is not a deposit of a
               bank and is not insured or guaranteed by the Federal Deposit
               Insurance Corporation or any other government agency. Although
               the Funds seek to preserve the value of your investment at $1.00
               per share, it is possible to lose money by investing in these
               Funds.
 
               The following information illustrates how Investor Shares of each
               Money Market Fund's performance has varied over time. The bar
               charts depict the change in performance from year to year.
 
 8 Janus Income Funds
<PAGE> 
 
                JANUS MONEY MARKET FUND - INVESTOR SHARES
 
A BAR CHART showing Annual Total Returns for Janus Money Market Fund - Investor 
Shares from 1996 through 1998:
   
                Annual returns for periods ended 12/31

                                                         5.06%    5.25%    5.20%
                                                         1996     1997     1998

Each percentage is represented by a bar of proportionate size with the actual 
total return printed above the bar.

                Best Quarter: 4th-1997 1.33%; Worst Quarter: 2nd-1996 1.22%
    
 
                JANUS GOVERNMENT MONEY MARKET FUND - INVESTOR SHARES

A BAR CHART showing Annual Total Returns for Janus Government Money Market Fund 
- - Investor Shares from 1996 through 1998.
   
                Annual returns for periods ended 12/31

                                                         4.97%    5.11%    5.06%
                                                         1996     1997     1998

Each percentage is represented by a bar of proportionate size with the actual
total return printed above the bar.

                Best Quarter: 4th-1997 1.30%; Worst Quarter: 1st-1997 1.18%
    

 
                JANUS TAX-EXEMPT MONEY MARKET FUND - INVESTOR SHARES

A BAR CHART showing Annual Total Returns for Janus Tax-Exempt Money Market Fund 
- - Investor Shares from 1996 through 1998:
   
                Annual returns for periods ended 12/31

                                                         3.18%    3.22%    3.20%
                                                         1996     1997     1998

Each percentage is represented by a bar of proportionate size with the actual 
total return printed above the bar.

                Best Quarter: 2nd-1997 0.86%; Worst Quarter: 1st-1997 0.70%
    
 
 
   
               The 7-day yield on December 31, 1998 was 4.96% for Janus Money
               Market Fund - Investor Shares; 4.69% for Janus Government Money
               Market Fund - Investor Shares; and 3.45% for Janus Tax-Exempt
               Money Market Fund - Investor Shares, respectively. For the Funds'
               current yields, call the Janus XpressLine(TM) at 1-888-979-7737.
    
 
               The Money Market Funds' past performance does not necessarily
               indicate how they will perform in the future.
 
                                                          Risk return summary  9
<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 Funds.
 
   
               ANNUAL FUND OPERATING EXPENSES are paid out of a Fund'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
               on the next page shows, these costs are borne indirectly by all
               shareholders.
    
 
 10 Janus Income Funds
<PAGE> 
 
   
This table describes the fees and expenses that you may pay if you buy and hold
shares of the Funds. It is based upon gross expenses (without the effect of
expense offset arrangements) for the fiscal year ended October 31, 1998.
    
 
<TABLE>
<CAPTION>
                                                         Janus                 Janus
                                                  Flexible Income Fund    High-Yield Fund
   <S>                                            <C>                     <C>             
   Management Fee                                    0.58%                  0.73%
   Other Expenses                                    0.26%                  0.26%
   Total Annual Fund Operating Expenses              0.84%                  0.99%
</TABLE>
 
- --------------------------------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                    Janus Federal        Janus Short-Term
                                                   Tax-Exempt Fund          Bond Fund
   <S>                                           <C>                     <C>              
   Management Fee                                        0.60 %                0.65 %
   Other Expenses                                        0.39 %                0.41 %
   Total Annual Fund Operating Expenses Without
     Waivers*                                            0.99 %                1.06 %
   Total Waivers                                        (0.32)%               (0.39)%
   Total Annual Fund Operating Expenses With
     Waivers*                                            0.67 %                0.67 %
</TABLE>
    
 
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                     Janus Money   Janus Government    Janus Tax-Exempt
           Investor Shares           Market Fund   Money Market Fund   Money Market Fund
   <S>                               <C>           <C>                 <C>               
   Management Fee                       0.20 %           0.20 %              0.20 %
   Other Expenses                       0.50 %           0.50 %              0.50 %
   Total Annual Fund Operating
     Expenses Without Waivers*          0.70 %           0.70 %              0.70 %
   Total Waivers                        (.10)%           (.10)%              (.10)%
   Total Annual Fund Operating
     Expenses With Waivers*             0.60 %           0.60 %              0.60 %
</TABLE>
 
- --------------------------------------------------------------------------------
   
  * All expenses are stated both with and without contractual waivers by
    Janus Capital. Waivers for the Fixed-Income Funds are first applied
    against the Management Fee and then against Other Expenses. Janus
    Capital has agreed to continue such waivers until at least the next
    annual renewal of the advisory agreements.
    
- --------------------------------------------------------------------------------
 
  EXAMPLE:
  THE FOLLOWING EXAMPLE IS BASED ON FUND EXPENSES WITHOUT WAIVERS.
  This example is intended to help you compare the cost of investing in the
  Funds with the cost of investing in other mutual funds. The example
  assumes that you invest $10,000 in each of the Funds 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 Funds' 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    5 Years    10 Years
                                             ----------------------------------------
   <S>                                       <C>       <C>        <C>        <C>      
   Janus Flexible Income Fund                 $ 86      $268       $466       $1,037
   Janus High-Yield Fund                      $101      $315       $547       $1,213
   Janus Federal Tax-Exempt Fund              $101      $315       $547       $1,213
   Janus Short-Term Bond Fund                 $108      $337       $585       $1,294
   Janus Money Market Fund - Investor
     Shares                                   $ 72      $224       $390       $  871
   Janus Government Money Market Fund -
     Investor Shares                          $ 72      $224       $390       $  871
   Janus Tax-Exempt Money Market Fund -
     Investor Shares                          $ 72      $224       $390       $  871
</TABLE>
 
                                                         Risk return summary  11
<PAGE> 
Investment objectives, principal 
           investment strategies 
           and risks
 
FIXED-INCOME FUNDS
 
               This section takes a closer look at the investment objectives of
               each of the Fixed-Income Funds, their principal investment
               strategies and certain risks of investing in the Fixed-Income
               Funds. 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 19-21 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
 
   
               In addition to considering economic factors such as the effect of
               interest rates on a Fund's investments, the portfolio managers
               apply a "bottom up" approach in choosing investments. In other
               words, they look mostly for income-producing securities that meet
               their investment criteria one at a time. If a portfolio manager
               is unable to find such investments, much of a Fund's assets may
               be in cash or similar investments.
    
 
               JANUS FLEXIBLE INCOME FUND
               Janus Flexible Income Fund 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 Fund
               will invest at least 80% of its assets in income-producing
               securities. The Fund may own an unlimited amount of high-
               yield/high-risk securities, and these may be a big part of the
               portfolio. This Fund generates total return from a combination of
               current income and capital appreciation, but income is usually
               the dominant portion.
 
               JANUS HIGH-YIELD FUND
               Janus High-Yield Fund seeks to obtain high current income.
               Capital appreciation is a secondary objective when consistent
               with
 
 12 Janus Income Funds
<PAGE> 
 
               its primary objective. It pursues its objectives by normally
               investing 65% of its assets in high-yield/high-risk fixed-income
               securities, and may at times invest all of its assets in these
               securities.
 
               JANUS FEDERAL TAX-EXEMPT FUND
               Janus Federal Tax-Exempt Fund seeks as high a level of current
               income exempt from federal income tax as is consistent with
               preservation of capital. It pursues its objective by investing
               primarily in municipal obligations of any maturity whose interest
               is exempt from federal income tax. As a fundamental policy, the
               Fund will normally invest at least 80% of its assets in
               securities whose interest is exempt from federal income tax,
               including the federal alternative minimum tax.
 
               JANUS SHORT-TERM BOND FUND
   
               Janus Short-Term Bond Fund seeks as high a level of current
               income as is consistent with preservation of capital. It pursues
               its objective by investing primarily in short- and
               intermediate-term fixed-income securities. The Fund will normally
               invest at least 65% of its assets in debt securities such as
               corporate bonds or notes, or U.S. Treasury bonds, and may invest
               up to 35% of its assets in high-yield/high-risk securities.
               Normally, the Fund expects to maintain an average weighted
               effective maturity of three years or less.
    
 
               "Effective" maturity differs from actual maturity, which may be
               longer. In calculating the "effective" maturity the portfolio
               manager will estimate the effect of expected principal payments
               and call provisions on securities held in the portfolio. This
               gives the portfolio manager some additional flexibility in the
               securities he purchases, but all else being equal, could result
               in more volatility than if the Fund calculated an actual maturity
               target.
 
            Investment objectives, principal investment strategies and risks  13
<PAGE> 
 
The following questions and answers are designed to help you better understand
the Fixed-Income Funds' 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 DO THE FIXED-INCOME FUNDS MANAGE INTEREST RATE RISK?
 
               Each Fixed-Income Fund may vary the average-weighted effective
               maturity of its portfolio to reflect its portfolio manager's
               analysis of interest rate trends and other factors. A Fund's
               average-weighted effective maturity will tend to be shorter when
               the portfolio manager expects interest rates to rise and longer
               when its portfolio manager expects interest rates to fall. The
               Funds may also use futures, options and other derivatives to
               manage interest rate risks.
 
3. WHAT IS MEANT BY A FUND'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
               averaging the effective maturity of bonds held by a Fund with
               each effective maturity "weighted" according to the percentage of
               net assets that it represents.
 
 14 Janus Income Funds
<PAGE> 
 
4. WHAT IS MEANT BY A FUND'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 fund 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, a Fund's duration is
               usually shorter than its average maturity.
 
5. WHAT IS A HIGH-YIELD/HIGH-RISK SECURITY?
 
               A high-yield/high-risk security (also called a "junk" bond) is a
               debt security 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.
 
GENERAL PORTFOLIO POLICIES
 
               Unless otherwise stated, each of the following policies applies
               to all of the Fixed-Income Funds. 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
               Fund 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 Fixed-Income Fund's portfolio manager believes that market
               conditions are unfavorable for profitable investing, or when he
               is otherwise unable to locate attractive investment
               opportunities, the Fund's cash or similar investments may
               increase. In other words, the Fixed-Income Funds do not always
               stay fully invested in 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 objectives, principal investment strategies and risks  15
<PAGE> 
 
               investment opportunities. However, a portfolio manager may also
               temporarily increase a Fund'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 Fixed-
               Income Funds may vary significantly.
 
   
               When a Fixed-Income Fund'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 Fund remained
               more fully invested in bonds.
    
 
               OTHER TYPES OF INVESTMENTS
   
               The Fixed-Income Funds invest 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 Funds 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 (without limit for Janus
                 Flexible Income Fund and Janus High-Yield Fund; and up to 25%
                 of Janus Federal Tax-Exempt Fund's and Janus Short-Term Bond
                 Fund's assets)
 
               - zero coupon, pay-in-kind and step coupon securities (without
                 limit for Janus Flexible Income Fund and Janus High-Yield Fund;
                 and up to 10% for Janus Federal Tax-Exempt Fund and Janus
                 Short-Term Bond Fund)
 
               - options, futures, forwards 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
 
 16 Janus Income Funds
<PAGE> 
 
               ILLIQUID INVESTMENTS
               Each Fund 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 Funds' Trustees,
               certain restricted securities may be deemed liquid, and will not
               be counted toward this 15% limit.
 
               FOREIGN SECURITIES
               The Funds may invest without limit in foreign equity and debt
               securities. The Funds 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 Fund may invest in special situations. A special situation
               arises when, in the opinion of a Fund's portfolio 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 Fund'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 Funds generally intend to purchase securities for long-term
               investment although, to a limited extent, a Fund may purchase
               securities in anticipation of relatively short-term price gains.
               Short-term transactions may also result from liquidity needs,
               securities
 
            Investment objectives, principal investment strategies and risks  17
<PAGE> 
 
               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 Fund 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 Fund's portfolio
               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 Fund's performance.
 
 18 Janus Income Funds
<PAGE> 
 
RISKS
 
   
               Because the Funds invest substantially all of their assets in
               fixed-income securities, they are subject to risks such as credit
               or default risks, and decreased value due to interest rate
               increases. A Fund's performance may also be affected by risks to
               certain types of investments, such as foreign securities and
               derivative instruments.
    
 
The following questions and answers are designed to help you better understand
some of the risks of investing in the Fixed-Income Funds.
 
1. HOW DO THE FIXED-INCOME FUNDS DIFFER FROM EACH OTHER IN TERMS OF PRIMARY
   INVESTMENT TYPE, CREDIT RISK AND INTEREST RATE RISK?
 
               The chart below shows that the Fixed-Income Funds differ
               substantially in terms of the type, credit quality and interest
               rate risk of the securities in which they invest. You should
               consider these factors before you determine whether a fund is a
               suitable investment.
 
<TABLE>
<CAPTION>
                                                     Primary           Credit        Interest
                                                 Investment Type        Risk         Rate Risk
- ------------------------------------------------------------------------------------------------
<S>                                           <C>                    <C>           <C>
 Janus Flexible Income Fund                   Corporate Bonds         High          High
 Janus High-Yield Fund                        Corporate Bonds         Highest       Moderate
 Janus Federal Tax-Exempt Fund                Municipal Securities    Low           High
 Janus Short-Term Bond Fund                   Corporate Bonds         Moderate      Low
</TABLE>
 
2. 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.
 
            Investment objectives, principal investment strategies and risks  19
<PAGE> 
 
3. HOW IS CREDIT QUALITY MEASURED?
 
               Ratings published by nationally recognized statistical rating
               agencies such as Standard & Poor's and Moody's 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 page 76 for a description of rating
               categories.
 
4. ARE THERE SPECIAL RISKS ASSOCIATED WITH INVESTMENTS IN HIGH-YIELD/HIGH-RISK
   SECURITIES?
 
   
               High-yield/high-risk securities (or "junk" bonds) are securities
               rated below investment grade by the primary rating agencies such
               as Standard & Poor's and Moody's. The value of lower quality
               securities generally is more dependent on credit risk, or the
               ability of the issuer to meet interest and principal payments,
               than investment grade debt securities. Issuers of high-yield
               securities 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 Janus Flexible Income Fund and Janus High-Yield
               Fund may invest a significant portion of their portfolios in
               high-yield/high-risk securities, 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 page 76 for a description of rating categories.
    
 
5. HOW DO THE FUNDS TRY TO REDUCE RISK?
 
               The Funds may use futures, options and other derivative
               instruments to "hedge" or protect their portfolios from adverse
               movements in securities prices and interest rates. The Funds may
               also use a variety of currency hedging techniques, including
               forward currency contracts, to manage exchange rate risk. The
 
 20 Janus Income Funds
<PAGE> 
 
               Funds believe the use of these instruments will benefit the
               Funds. However, a Fund's performance could be worse than if the
               Fund 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.
 
6. I'VE HEARD A LOT ABOUT HOW THE CHANGE TO THE YEAR 2000 COULD AFFECT COMPUTER
   SYSTEMS. DOES THIS CREATE ANY SPECIAL RISKS?
 
               The portfolio managers carefully research each potential
               investment before making an investment decision and, among other
               things, consider Year 2000 readiness when selecting portfolio
               holdings. However, there is no guarantee that the information a
               portfolio manager receives regarding a company's Year 2000
               readiness is completely accurate. If a company has not
               satisfactorily addressed Year 2000 issues, the Fund's performance
               could suffer.
 
7. HOW COULD THE FUNDS' INVESTMENTS IN FOREIGN SECURITIES AFFECT THEIR
   PERFORMANCE?
 
               The Funds 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 Funds' performance may depend on
               issues other than the performance of a particular company. These
               issues include:
 
               - currency risk
 
               - political and economic risk
 
               - regulatory risk
 
               - market risk
 
               - transaction costs
 
   
               These risks are described in the SAI.
    
 
            Investment objectives, principal investment strategies and risks  21
<PAGE> 
 
MONEY MARKET FUNDS
 
               This section takes a closer look at the investment objective of
               each of the Money Market Funds, their principal investment
               strategies and certain risks of investing in the Funds.
               Strategies and policies that are noted as "fundamental" cannot be
               changed without a shareholder vote.
 
               Money market funds are subject to certain specific SEC rule
               requirements. Among other things, the Funds are limited to
               investing in U.S. dollar-denominated instruments with a remaining
               maturity of 397 days or less (as calculated pursuant to Rule 2a-7
               under the 1940 Act).
 
INVESTMENT OBJECTIVES AND PRINCIPAL INVESTMENT STRATEGIES
 
               JANUS MONEY MARKET FUND
               Janus Money Market Fund seeks maximum current income to the
               extent consistent with stability of capital. It pursues its
               objective by investing primarily in high quality debt obligations
               and obligations of financial institutions. Debt obligations may
               include commercial paper, notes and bonds, and variable amount
               master demand notes. Obligations of financial institutions
               include certificates of deposit and time deposits.
 
               JANUS GOVERNMENT MONEY MARKET FUND
               Janus Government Money Market Fund seeks maximum current income
               to the extent consistent with stability of capital. It pursues
               its objective by investing exclusively in obligations issued
               and/or guaranteed as to principal and interest by the United
               States government or by its agencies and instrumentalities and
               repurchase agreements secured by such obligations.
 
               JANUS TAX-EXEMPT MONEY MARKET FUND
               Janus Tax-Exempt Money Market Fund seeks maximum current income
               that is exempt from federal income taxes to the extent consistent
               with stability of capital. It pursues it objective by investing
               primarily in municipal securities whose interest is exempt from
               federal income taxes, including the federal alternative
 
 22 Janus Income Funds
<PAGE> 
 
               minimum tax. The Fund may invest up to 20% of its net assets in
               taxable securities and may invest without limit in cash and cash
               equivalents to the extent the portfolio manager cannot locate
               investment opportunities with desirable risk/reward
               characteristics.
 
               COMMON INVESTMENT POLICIES
 
               Each of the Money Market Funds will:
 
               - invest in high quality, short-term money market instruments
                 that present minimal credit risks, as determined by Janus
                 Capital
 
               - invest only in U.S. dollar-denominated instruments that have a
                 remaining maturity of 397 days or less (as calculated pursuant
                 to Rule 2a-7 under the 1940 Act)
 
               - maintain a dollar-weighted average portfolio maturity of 90
                 days or less
 
               TYPES OF INVESTMENTS
 
               JANUS MONEY MARKET FUND
 
               Janus Money Market Fund invests primarily in:
 
               - high quality debt obligations
 
               - obligations of financial institutions
 
               This Fund may also invest (to a lesser degree) in:
 
               - U.S. Government Securities (securities issued or guaranteed by
                 the U.S. government, its agencies and instrumentalities)
 
               - municipal securities
 
               DEBT OBLIGATIONS
 
               The Fund may invest in debt obligations of domestic issuers. Debt
               obligations include:
 
               - commercial paper
 
               - notes and bonds
 
            Investment objectives, principal investment strategies and risks  23
<PAGE> 
 
               - variable amount master demand notes (the payment obligations on
                 these instruments may be backed by securities, swap agreements
                 or other assets, by a guarantee of a third party or solely by
                 the unsecured promise of the issuer to make payments when due)
 
               - privately issued commercial paper or other securities that are
                 restricted as to disposition under the federal securities laws
 
               OBLIGATIONS OF FINANCIAL INSTITUTIONS
               Examples of obligations of financial institutions include:
 
               - negotiable certificates of deposit, bankers' acceptances, time
                 deposits and other obligations of U.S. banks (including savings
                 and loan associations) having total assets in excess of one
                 billion dollars and U.S. branches of foreign banks having total
                 assets in excess of ten billion dollars
 
   
               - Eurodollar and Yankee bank obligations (Eurodollar bank
                 obligations are dollar-denominated certificates of deposit or
                 time deposits issued outside the U.S. capital markets by
                 foreign branches of U.S. banks and by foreign banks. Yankee
                 bank obligations are dollar-denominated obligations issued in
                 the U.S. capital markets by foreign banks)
    
 
               - other U.S. dollar-denominated obligations of foreign banks
                 having total assets in excess of ten billion dollars that Janus
                 Capital believes are of an investment quality comparable to
                 obligations of U.S. banks in which the Fund may invest
 
               Foreign, Eurodollar (and to a limited extent, Yankee) bank
               obligations are subject to certain sovereign risks. One such risk
               is the possibility that a foreign government might prevent
               dollar-denominated funds from flowing across its borders. Other
               risks include: adverse political and economic developments in a
               foreign country; the extent and quality of government regulation
               of financial markets and institutions; the imposition of foreign
               withholding taxes; and expropriation or nationalization of
               foreign issuers.
 
 24 Janus Income Funds
<PAGE> 
 
               JANUS GOVERNMENT MONEY MARKET FUND
 
               Janus Government Money Market Fund invests exclusively in:
 
               - U.S. Government Securities
 
               - repurchase agreements secured by such obligations
 
               JANUS TAX-EXEMPT MONEY MARKET FUND
 
               Janus Tax-Exempt Money Market Fund invests primarily in municipal
               securities whose interest is exempt from federal income taxes,
               including the federal alternative minimum tax. However, this Fund
               reserves the right to invest:
 
               - up to 20% of its net assets in securities whose interest is
                 federally taxable
 
               - without limit in cash and cash equivalents, including
                 obligations that may be federally taxable (when its portfolio
                 manager is unable to locate investment opportunities with
                 desirable risk/reward characteristics)
 
               MUNICIPAL SECURITIES
               Municipal securities include:
 
               - municipal notes
 
               - short-term municipal bonds
 
               - participation interests in municipal securities
 
               At times, the Fund may invest more than 25% of its total assets
               in tax-exempt securities that are related in such a way that an
               economic, business, or political development or change affecting
               one such security could similarly affect the other securities.
               Examples include securities whose issuers are located in the same
               state, or securities whose interest is derived from revenues of
               similar type projects. The Fund may also invest more than 25% of
               its assets in industrial development bonds or participation
               interests therein.
 
            Investment objectives, principal investment strategies and risks  25
<PAGE> 
 
               Yields on municipal securities are dependent on a variety of
               factors, including general market conditions, the size of a
               particular offering, the maturity of the obligation and the
               rating of the issue. Municipal securities investments may lose
               money if the municipal securities issuer does not pay principal
               and interest when due. Bankruptcy, insolvency and other laws
               affecting the rights and remedies of creditors may affect the
               issuer's ability to pay.
 
               MUNICIPAL LEASES
               The Fund may invest in municipal leases or participation
               interests therein. The issuing municipality's credit will not
               necessarily back a lease obligation. Interest on lease
               obligations may become taxable if the lease is assigned. The Fund
               may incur losses if the issuer does not appropriate funds for the
               lease payment on an annual basis.
 
               TAXABLE INVESTMENTS
               As discussed above, although the Fund will attempt to invest
               substantially all of its assets in municipal securities whose
               interest is exempt from federal income tax, the Fund may under
               certain circumstances invest in certain securities whose interest
               is subject to such taxation, as described under Janus Money
               Market Fund's investments.
 
               COMMON INVESTMENT TECHNIQUES
 
               The following is a description of other investment techniques
               that the Money Market Funds may use:
 
               PARTICIPATION INTERESTS
               A participation interest gives a Money Market Fund a
               proportionate, undivided interest in underlying debt securities
               and usually carries a demand feature.
 
               DEMAND FEATURES
               Demand features give the Money Market Funds the right to resell
               securities at specified periods prior to their maturity dates.
 
 26 Janus Income Funds
<PAGE> 
 
               Demand features may shorten the life of a variable or floating
               rate security, enhance the instrument's credit quality and
               provide a source of liquidity.
 
               Demand features are often issued by third party financial
               institutions, generally domestic and foreign banks. Accordingly,
               the credit quality and liquidity of the Money Market Funds'
               investments may be dependent in part on the credit quality of the
               banks supporting the Money Market Funds' investments. This will
               result in exposure to risks pertaining to the banking industry,
               including the foreign banking industry. Brokerage firms and
               insurance companies also provide certain liquidity and credit
               support. A substantial portion of the Janus Tax-Exempt Money
               Market Fund's portfolio in particular may consist of securities
               backed by banks and other financial institutions, and thus
               adverse changes in the credit quality of these institutions could
               cause losses to the Fund and affect its share price.
 
               VARIABLE AND FLOATING RATE SECURITIES
               The Money Market Funds may invest in securities which have
               variable or floating rates of interest. These securities pay
               interest at rates that are adjusted periodically according to a
               specified formula, usually with reference to an interest rate
               index or market interest rate. Variable and floating rate
               securities are subject to changes in value based on changes in
               market interest rates or changes in the issuer's or guarantor's
               creditworthiness.
 
               MORTGAGE- AND ASSET-BACKED SECURITIES
               The Money Market Funds may purchase fixed or variable rate
               mortgage-backed securities issued by the Government National
               Mortgage Association, Federal National Mortgage Association, the
               Federal Home Loan Mortgage Corporation, or other governmental or
               government-related entity. Janus Money Market Fund and Janus
               Tax-Exempt Money Market Fund may purchase other mortgage- and
               asset-backed securities including securities backed by automobile
               loans, equipment leases or credit card receivables.
 
            Investment objectives, principal investment strategies and risks  27
<PAGE> 
 
               Unlike traditional debt instruments, payments on these securities
               include both interest and a partial payment of principal.
               Prepayments of the principal of underlying loans may shorten the
               effective maturities of these securities and may result in a Fund
               having to reinvest proceeds at a lower interest rate.
 
               REPURCHASE AGREEMENTS
               Each Money Market Fund may enter into a collateralized repurchase
               agreements. Repurchase agreements are transactions in which a
               Fund purchases securities and simultaneously commits to resell
               those securities to the seller at an agreed-upon price on an
               agreed-upon future date. The repurchase price reflects a market
               rate of interest and is collateralized by cash or securities.
 
               If the seller of the securities underlying a repurchase agreement
               fails to pay the agreed resale price on the agreed delivery date,
               a Money Market Fund may incur costs in disposing of the
               collateral and may experience losses if there is any delay in its
               ability to do so.
 
 28 Janus Income Funds
<PAGE> 
 
                       This page intentionally left blank
 
                                                                              29
<PAGE> 
 
Janus Income Funds
<PAGE> 
 
                   Shareholder's
                   Manual
 
                   This section will help you become
                   familiar with the different types
                   of accounts you can establish with
                   Janus. It also explains in detail
                   the wide array of services and
                   features you can establish on your
                   account, as well as account
                   policies and fees that may apply
                   to your account. Account policies
                   (including fees), services and
                   features may be modified or
                   discontinued without shareholder
                   approval or prior notice.
 
                                                    [JANUS LOGO]
<PAGE> 
 
HOW TO GET IN TOUCH WITH JANUS
 
               Janus offers two Investor Service Centers for those individuals
               who would like to conduct their investing in person. Our
               representatives will be happy to assist you at either of the
               following locations Monday-Friday 7:00 a.m. to 6:00 p.m. Mountain
               time and Saturday 9:00 a.m. to 1:00 p.m. Mountain time.
 
               100 Fillmore Street, Suite 100
               Denver, CO 80206
 
               3773 Cherry Creek North Drive, Suite 101
   
               Denver, CO 80209
    
 
   
 QUICK ADDRESS AND TELEPHONE REFERENCE
    
- --------------------------------------------------------------------------------
 
<TABLE>
  <S>                                           <C>
  MAILING ADDRESS                               JANUS XPRESSLINE(TM)
  Janus                                         1-888-979-7737
  P.O. Box 173375                               For 24-hour access to account
  Denver, CO 80217-3375                         and fund information,
                                                exchanges, purchases and
  FOR OVERNIGHT CARRIER                         redemptions, automated daily
  Janus                                         quotes on fund share prices,
  Suite 101                                     yields and total returns.
  3773 Cherry Creek North Drive
  Denver, CO 80209-3811                         TDD
                                                1-800-525-0056
  INVESTOR SERVICE REPRESENTATIVES              A telecommunications device
  If you have any questions while reading       for our hearing- and
  this Prospectus, please call one of our       speech-impaired shareholders.
  Investor Service Representatives at
  1-800-525-3713 Monday-Friday: 8:00            JANUS LITERATURE LINE
  a.m.-8:00 p.m., and Saturday: 10:00           1-800-525-8983
  a.m.-4:00 p.m., New York time.                To request a prospectus,
                                                shareholder reports or
  JANUS INTERNET ADDRESS                        marketing materials 24 hours a
  janus.com                                     day.
</TABLE>
 
 32 Janus Income Funds
<PAGE> 
 
MINIMUM INVESTMENTS*
- ---------------------------------------------
 
<TABLE>
<S>                                 <C>
To open a new regular account        $2,500
To open a new retirement,
education or UGMA/UTMA account       $  500
To open a new regular account with
an Automatic Investment Program      $  500**
To add to any type of an account     $  100+
</TABLE>
 
 * The Funds reserve the right to
   change the amount of these
   minimums from time to time or
   to waive them in whole or in
   part for certain types of
   accounts.
** An Automatic Investment Program
   requires a $100 minimum
   automatic investment per month
   until the account balance
   reaches $2,500.
 + The minimum subsequent
   investment for IRA UGMA/UTMA
   accounts is $50.
 
TYPES OF ACCOUNT OWNERSHIP
 
               If you are investing in the Funds for the first time, you will
               need to establish an account. You can establish the following
               types of accounts by completing a New Account Application. To
               request an application, call 1-800-525-3713 or visit our Web site
               at janus.com to download an application.
 
               INDIVIDUAL OR JOINT OWNERSHIP
               Individual accounts are owned by one person. Joint accounts have
               two or more owners.
 
               A GIFT OR TRANSFER TO MINOR (UGMA OR UTMA)
               An UGMA/UTMA account is a custodial account managed for the
               benefit of a minor. To open an UGMA or UTMA account, you must
               include the minor's Social Security number on the application.
 
               TRUST
               An established trust can open an account. The names of each
               trustee, the name of the trust and the date of the trust
               agreement must be included on the application.
 
                                                        Shareholder's manual  33
<PAGE> 
 
               BUSINESS ACCOUNTS
               Corporations and partnerships may also open an account. The
               application must be signed by an authorized officer of the
               corporation or a general partner of the partnership.
 
TAX-DEFERRED ACCOUNTS
 
               If you are eligible, you may set up one or more tax-deferred
               accounts. A tax-deferred account allows you to shelter your
               investment income and capital gains from current income taxes. A
               contribution to certain of these plans may also be tax
               deductible. Tax-deferred accounts include retirement plans
               described below and the Education IRA. Distributions from these
               plans are generally subject to income tax and may be subject to
               an additional tax if withdrawn prior to age 59 1/2 or used for a
               nonqualifying purpose. Investors should consult their tax adviser
               or legal counsel before selecting a tax-deferred account.
 
   
               Investors Fiduciary Trust Company serves as custodian for the
               tax-deferred accounts offered by the Funds. You will be charged
               an annual account maintenance fee of $12 for each taxpayer
               identification number no matter how many tax-deferred accounts
               you have with Janus. You may pay the fee by check or have it
               automatically deducted from your account (usually in December).
               The custodian reserves the right to change the amount of this fee
               or to waive it in whole or in part for certain types of accounts.
    
 
               The following plans require a special application. For an
               application and more details about our Retirement Plans, call
               1-800-525-3713.
 
               TRADITIONAL AND ROTH INDIVIDUAL RETIREMENT ACCOUNTS
               Both types of IRAs allow most individuals with earned income to
               contribute up to the lesser of $2,000 ($4,000 for most married
               couples) or 100% of compensation annually. Please refer to the
               Janus IRA booklet for more complete information regarding the
               different types of IRAs.
 
 34 Janus Income Funds
<PAGE> 
 
               EDUCATION IRA
               This plan allows individuals, subject to certain income
               limitations, to contribute up to $500 annually on behalf of any
               child under the age of 18. Please refer to the Janus IRA booklet
               for more complete information regarding the Education IRA.
 
               SIMPLIFIED EMPLOYEE PENSION PLAN
               This plan allows small business owners (including sole
               proprietors) to make tax-deductible contributions for themselves
               and any eligible employee(s). A SEP requires an IRA (a SEP-IRA)
               to be set up for each SEP.
 
               PROFIT SHARING OR MONEY PURCHASE PENSION PLAN
               These plans are open to corporations, partnerships and sole
               proprietors to benefit their employees and themselves.
 
               SECTION 403(B)(7) PLAN
               Employees of educational organizations or other qualifying, tax-
               exempt organizations may be eligible to participate in a Section
               403(b)(7) Plan.
 
HOW TO OPEN YOUR JANUS ACCOUNT
 
               Complete and sign the appropriate application. Please be sure to
               provide your Social Security or taxpayer identification number on
               the application and make your check payable to Janus. The Funds
               are available only to U.S. citizens or residents, and your
               application will be returned if you do not meet these criteria.
               Send all items to one of the addresses listed in the "Quick
               Address and Telephone Reference" on page 32.
 
                                                        Shareholder's manual  35
<PAGE> 
 
HOW TO PURCHASE SHARES
 
               PAYING FOR SHARES
 
               When you purchase shares, your request will be processed at the
               next NAV calculated after your order is received and accepted.
               Please note the following:
 
               - Cash, credit cards, third party checks and credit card checks
                 will not be accepted.
 
               - All purchases must be made in U.S. dollars.
 
               - Checks must be drawn on U.S. banks and made payable to Janus.
 
               - If a check does not clear your bank, the Funds reserve the
                 right to cancel the purchase.
 
               - If the Funds are unable to debit your predesignated bank
                 account on the day of purchase, they may make additional
                 attempts or cancel the purchase.
 
               - The Funds reserve the right to reject any specific purchase
                 request.
 
               If your purchase is cancelled, you will be responsible for any
               losses or fees imposed by your bank and losses that may be
               incurred as a result of any decline in the value of the cancelled
               purchase. The Funds (or their agents) have the authority to
               redeem shares in your account(s) to cover any losses due to
               fluctuations in share price. Any profit on such cancellation will
               accrue to the Fund.
 
               ONCE YOU HAVE OPENED YOUR JANUS ACCOUNT, THE MINIMUM AMOUNT FOR
               AN ADDITIONAL INVESTMENT IS $100 ($50 FOR IRAS OR UGMA/UTMA
               ACCOUNTS). You may add to your account at any time through any of
               the following options:
 
               BY MAIL
 
               Complete the remittance slip attached at the bottom of your
               confirmation statement. If you are making a purchase into a
 
 36 Janus Income Funds
<PAGE> 
 
               retirement account, please indicate whether the purchase is a
               rollover or a current or prior year contribution. Send your check
               made payable to Janus and remittance slip or written instructions
               to one of the addresses listed previously. You may also request a
               booklet of remittance slips for non-retirement accounts.
 
               BY TELEPHONE
 
               This service allows you to purchase additional shares quickly and
               conveniently through an electronic transfer of money. To purchase
               shares by telephone, call an Investor Service Representative at
               1-800-525-3713 during normal business hours or call the Janus
               XpressLine, 1-888-979-7737, for access to this option 24 hours a
               day. When you make an additional purchase by telephone, Janus
               will automatically debit your predesignated bank account for the
               desired amount. To establish the telephone purchase option on
               your new account, complete the "Telephone Purchase of Shares
               Option" section on the application and attach a "voided" check or
               deposit slip from your bank account. If your account is already
               established, call 1-800-525-3713 to request the appropriate form.
               This option will become effective ten business days after the
               form is received.
 
               BY WIRE
 
               Purchases may also be made by wiring money from your bank account
               to your Janus account. Call 1-800-525-3713 to receive wiring
               instructions.
 
               BY INTERNET
 
               You must pre-establish the "Telephone Purchase of Shares Option"
               to make a purchase on our Web site at janus.com. If you have
               questions, please call 1-800-975-9932 to speak to a Janus
               representative.
 
                                                        Shareholder's manual  37
<PAGE> 
 
               AUTOMATIC INVESTMENT PROGRAMS
 
               Janus offers several automatic investment programs to help you
               achieve your financial goals as simply and conveniently as
               possible. You may open a new account with a $500 initial purchase
               and $100 automatic subsequent investments.
 
               AUTOMATIC MONTHLY INVESTMENT PROGRAM
               You select the day each month that your money ($100 minimum) will
               be electronically transferred from your bank account to your Fund
               account. To establish this option, complete the "Automatic
               Monthly Investment Program" section on the application and attach
               a "voided" check from your bank account. If your Fund account is
               already established, call 1-800-525-3713 to request the
               appropriate form.
 
               PAYROLL DEDUCTION
               If your employer can initiate an automatic payroll deduction, you
               may have all or a portion of your paycheck ($100 minimum)
               invested directly into your Fund account. To obtain information
               on establishing this option, call 1-800-525-3713.
 
               SYSTEMATIC EXCHANGE
               With a Systematic Exchange you determine the amount of money
               ($100 minimum) you would like automatically exchanged from one
               Janus account to another on any day of the month. For more
               information on how to establish this option, call 1-800-525-3713.
 
HOW TO EXCHANGE SHARES
 
   
               On any business day, you may exchange all or a portion of your
               shares into any other available Janus fund.
    
 
 38 Janus Income Funds
<PAGE> 
 
               IN WRITING
 
               To request an exchange in writing, please follow the instructions
               for written requests on page 42.
 
               BY TELEPHONE
 
               All accounts are automatically eligible for the telephone
               exchange option. To exchange shares by telephone, call an
               Investor Service Representative at 1-800-525-3713 during normal
               business hours or call the Janus XpressLine, 1-888-979-7737, for
               access to this option 24 hours a day.
 
               BY SYSTEMATIC EXCHANGE
 
               As noted above, you may establish a Systematic Exchange for as
               little as $100 per month on established accounts. You may
               establish a new account with a $500 initial purchase and
               subsequent $100 systematic exchanges. If the balance in the
               account you are exchanging from falls below the systematic
               exchange amount, all remaining shares will be exchanged and the
               program will be discontinued.
 
               BY INTERNET
 
               Exchanges may also be made on our Web site at janus.com.
 
               EXCHANGE POLICIES
 
               - Except for Systematic Exchanges, new accounts established by
                 exchange must be opened with $2,500 or the total account value
                 if the value of the account you are exchanging from is less
                 than $2,500.
 
               - Exchanges between existing accounts must meet the $100
                 subsequent investment requirement.
 
               - You may make four exchanges out of each non-Money Market Fund
                 during a calendar year (exclusive of Systematic Exchanges).
                 Exchanges in excess of this limit may be subject to an exchange
                 fee or may result in termination of the exchange
 
                                                        Shareholder's manual  39
<PAGE> 
 
                 privilege. There is currently no limit on exchanges out of the
                 Money Market Funds.
 
               - The Funds reserve the right to reject any exchange request and
                 to modify or terminate the exchange privilege at any time. For
                 example, the Funds may reject exchanges from accounts engaged
                 in or known to engage in trading in excess of the limit above
                 (including market timing transactions).
 
               - Exchanges between accounts will be accepted only if the
                 registrations are identical.
 
               - If the shares you are exchanging are held in certificate form,
                 you must return the certificate to your Fund prior to making
                 any exchanges.
 
               - Be sure that you read the prospectus for the fund into which
                 you are exchanging.
 
               - An exchange represents the sale of shares from one fund and the
                 purchase of shares of another fund, which may produce a taxable
                 gain or loss in a non-tax deferred account. Because the Money
                 Market Funds seek to maintain a stable net asset value per
                 share, it is not anticipated that a sale of Shares of the Money
                 Market Funds will produce a taxable gain or loss.
 
HOW TO REDEEM SHARES
 
   
               On any business day, you may redeem all or a portion of your
               shares. If the shares are held in certificate form, the
               certificate must be returned with or before your redemption
               request. Your transaction will be processed at the next NAV
               calculated after your order is received and accepted. The
               redemption may be suspended for 10 days following an address
               change unless a signature guarantee is provided.
    
 
               IN WRITING
 
               To request a redemption in writing, please follow the
               instructions for written requests on page 42.
 
 40 Janus Income Funds
<PAGE> 
 
               BY TELEPHONE
 
               Most accounts have the telephone redemption option, unless this
               option was specifically declined on the application or in
               writing. This option enables you to request redemptions daily
               from your account by calling 1-800-525-3713 by the close of the
               regular trading session of the NYSE, normally 4:00 p.m. New York
               time (or until 5:00 p.m. for Janus Government Money Market Fund).
               You may also use Janus XpressLine, 1-888-979-7737, for access to
               this option 24 hours a day. (There is a daily limit of $100,000
               per account for redemptions payable by check.)
 
               BY INTERNET
 
               Redemptions may also be made on our Web site at janus.com.
 
               SYSTEMATIC REDEMPTION OPTION
 
               The Systematic Redemption Option allows you to redeem a specific
               dollar amount from your account on a regular basis. For more
               information or to request the appropriate form, please call
               1-800-525-3713.
 
PAYMENT OF REDEMPTION PROCEEDS
 
               BY CHECK
               Redemption proceeds will be sent to the shareholder(s) of record
               at the address of record within seven days after receipt of a
               valid redemption request.
 
               BY ELECTRONIC TRANSFER
               If you have established the electronic redemption option, your
               redemption proceeds can be electronically transferred to your
               predesignated bank account on the next bank business day after
               receipt of your redemption request (wire transfer) or the second
               bank business day after receipt of your redemption request (ACH
               transfer). Wire transfers will be charged an $8 fee per wire and
               your bank may charge an additional fee to receive the wire. ACH
 
                                                        Shareholder's manual  41
<PAGE> 
 
               transfers are made free of charge. Wire redemptions are not
               available for retirement accounts.
 
               If you would like to establish the electronic redemption option
               on an existing account, please call 1-800-525-3713 to request the
               appropriate form.
 
               IF THE SHARES BEING REDEEMED WERE PURCHASED BY CHECK, TELEPHONE
               ON OUR WEB SITE, OR THROUGH THE AUTOMATIC MONTHLY INVESTMENT
               PROGRAM, THE FIXED-INCOME FUNDS MAY DELAY THE PAYMENT OF YOUR
               REDEMPTION PROCEEDS FOR UP TO 15 DAYS FROM THE DAY OF PURCHASE TO
               ALLOW THE PURCHASE TO CLEAR. Unless you provide alternate
               instructions, your proceeds will be invested in Janus Money
               Market Fund - Investor Shares during the 15 day hold period.
 
WRITTEN INSTRUCTIONS
 
               To redeem or exchange all or part of your shares in writing, your
               request should be sent to one of the addresses listed on page 32
               and must include the following information:
 
               - the name of the Fund(s)
 
               - the account number(s)
 
               - the amount of money or number of shares being redeemed or
                 exchanged
 
               - the name(s) on the account
 
               - the signature(s) of all registered account owners
 
               - your daytime telephone number
 
               SIGNATURE REQUIREMENTS BASED ON ACCOUNT TYPE
 
               INDIVIDUAL, JOINT TENANTS, TENANTS IN COMMON
               Written instructions must be signed by each shareholder, exactly
               as the names appear in the account registration.
 
 42 Janus Income Funds
<PAGE> 
 
               UGMA OR UTMA
               Written instructions must be signed by the custodian in his/her
               capacity as it appears in the account registration.
 
               SOLE PROPRIETOR, GENERAL PARTNER
               Written instructions must be signed by an authorized individual
               in his/her capacity as it appears in the account registration.
 
               CORPORATION, ASSOCIATION
               Written instructions must be signed by the person(s) authorized
               to act on the account. In addition, a certified copy of the
               corporate resolution authorizing the signer to act must accompany
               the request.
 
               TRUST
               Written instructions must be signed by the trustee(s). If the
               name of the current trustee(s) does not appear in the account
               registration, a certificate of incumbency dated within 60 days
               must also be submitted.
 
               IRA
               Written instructions must be signed by the account owner. If you
               do not want federal income tax withheld from your redemption, you
               must state that you elect not to have such withholding apply. In
               addition, your instructions must state whether the distribution
               is normal (after age 59 1/2) or premature (before age 59 1/2)
               and, if premature, whether any exceptions such as death or
               disability apply with regard to the 10% additional tax on early
               distributions.
 
SIGNATURE GUARANTEE
 
               In addition to the signature requirements, A SIGNATURE GUARANTEE
               IS ALSO REQUIRED if any of the following is applicable:
 
               - You request a redemption by check that exceeds $100,000.
 
               - You would like the check made payable to anyone other than the
                 shareholder(s) of record.
 
                                                        Shareholder's manual  43
<PAGE> 
 
               - You would like the check mailed to an address which has been
                 changed within 10 days of the redemption request.
 
               - You would like the check mailed to an address other than the
                 address of record.
 
               THE FUNDS RESERVE THE RIGHT TO REQUIRE A SIGNATURE GUARANTEE
               UNDER OTHER CIRCUMSTANCES OR TO REJECT OR DELAY A REDEMPTION ON
               CERTAIN LEGAL GROUNDS. FOR MORE INFORMATION PERTAINING TO
               SIGNATURE GUARANTEES, PLEASE CALL 1-800-525-3713.
 
               HOW TO OBTAIN A SIGNATURE GUARANTEE
 
               A signature guarantee assures that a signature is genuine. The
               signature guarantee protects shareholders from unauthorized
               account transfers. The following financial institutions may
               guarantee signatures: banks, savings and loan associations, trust
               companies, credit unions, broker-dealers, and member firms of a
               national securities exchange. Call your financial institution to
               see if they have the ability to guarantee a signature. A
               signature guarantee cannot be provided by a notary public.
 
               If you live outside the United States, a foreign bank properly
               authorized to do business in your country of residence or a U.S.
               consulate may be able to authenticate your signature.
 
PRICING OF FUND SHARES
 
   
               All purchases, redemptions and exchanges will be processed at the
               NAV next calculated after your request is received and accepted
               by a Fund (or a Fund's agent or authorized designee). A Fund's
               NAV is calculated at the close of the regular trading session of
               the NYSE (normally 4:00 p.m. New York time) each day that the
               NYSE is open ("business day") (and, in the case of the Money
               Market Funds, the Federal Reserve Banks are also open ("bank
               business day")) except that Janus Government Money Market Fund's
               NAV is normally calculated at 5:00 p.m. (New York time) on such
               days. The NAV of Fixed-Income Fund shares is not determined on
               days the NYSE is closed (generally, New Year's Day, Martin Luther
               King Day, Presidents' Day, Good Friday,
    
 
 44 Janus Income Funds
<PAGE> 
 
   
               Memorial Day, Independence Day, Labor Day, Thanksgiving and
               Christmas) and, in the case of the Money Market Funds, when the
               Federal Reserve Banks are closed (generally, the same days the
               NYSE is closed and also Columbus Day and Veterans' Day). In order
               to receive a day's price, your order must be received by the
               close of the regular trading session of the NYSE. In order to
               receive same day dividends for the Money Market Funds, your
               purchase request must be received by 3:00 p.m. New York time for
               the Janus Money Market Fund, 5:00 p.m. New York time for the
               Janus Government Money Market Fund and 12:00 p.m. New York time
               for the Janus Tax-Exempt Money Market Fund (the daily yield for
               the Money Market Funds is calculated after these times). The
               Money Market Funds reserve the right to require purchase,
               redemption and exchange requests and payments prior to this time
               on days when the bond market or the NYSE close early.
    
 
               The Fixed-Income Funds' portfolio securities 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.
 
               The Money Market Funds' portfolio securities are valued at their
               amortized cost. Amortized cost valuation involves valuing an
               instrument at its cost and thereafter assuming a constant
               amortization to maturity (or such other date as permitted by Rule
               2a-7) of any discount or premium. If fluctuating interest rates
               cause the market value of a Fund's portfolio to deviate more than
               1/2 of 1% from the value determined on the basis of amortized
               cost, the Trustees will consider whether any action, such as
               adjusting the Share's NAV to reflect current market conditions,
               should be initiated to prevent any material dilutive effect on
               shareholders.
 
               See your Fund's SAI for more detailed information.
 
                                                        Shareholder's manual  45
<PAGE> 
 
SHAREHOLDER SERVICES AND ACCOUNT POLICIES
 
               JANUS XPRESSLINE(TM)
 
               Janus XpressLine, our electronic telephone service, offers you
               24-hour access by TouchTone(TM) telephone to obtain information
               on account balances, Fund performance or dividends. You can also
               make exchanges, purchases and redemptions in existing accounts,
               request literature about any Janus fund, or order duplicate
               statements. Janus XpressLine is accessed by calling
               1-888-979-7737. Calls are limited to five minutes.
 
               JANUS WEB SITE
 
               Janus maintains a Web site located at JANUS.COM. You can
               purchase, exchange and redeem shares and access information such
               as your account balance and the Funds' NAVs through the Web site.
               In order to engage in transactions on our Web site, you must
               authorize us to transmit account information online and accept
               online instructions (see janus.com and follow the procedures
               accordingly). You may also need to have bank account information,
               wire instructions or other options established on your account.
               The Funds and their agents will not be responsible for any losses
               resulting from unauthorized transactions on our Web site when
               procedures designed for engaging in such transactions are
               followed. If you have questions, please call 1-800-975-9932 to
               speak to a Janus representative.
 
               CHECK WRITING PRIVILEGE
 
               Check writing privileges are available for all three Money Market
               Funds. Checkbooks will be issued to shareholders who have
               completed a Signature Draft Card, which is sent in the new
               account welcome package or by calling 1-800-525-3713. (There is
               no check writing privilege for retirement accounts.) Your
               checkbook will be mailed approximately 10 days after the check
               writing privilege is requested. Checks may be written for $250 or
               more per check. Purchases made by check or the Automatic Monthly
               Investment Program may not be redeemed by a redemption check
 
 46 Janus Income Funds
<PAGE> 
 
               until the 15-day hold period has passed. All checks written on
               the account must be signed by all account holders unless
               otherwise specified on the original application or the subsequent
               Signature Draft Card. The Funds reserve the right to terminate or
               modify the check writing privilege at any time.
 
               ACCOUNT MINIMUMS
 
               Due to the proportionately higher costs of maintaining small
               accounts, Janus reserves the right to deduct a $10 minimum
               balance fee (or the value of the account if less than $10) from
               accounts with values below the minimums described on page 33 or
               to close such accounts. This policy will apply to accounts
               participating in the Automatic Monthly Investment Program only if
               your account balance does not reach the required minimum initial
               investment or falls below such minimum and you have discontinued
               monthly investments. This policy does not apply to accounts that
               fall below the minimums solely as a result of market value
               fluctuations. It is expected that, for purposes of this policy,
               accounts will be valued in September, and the $10 fee will be
               assessed on the second Friday of September of each year. You will
               receive notice before we charge the $10 fee or close your account
               so that you may increase your account balance to the required
               minimum.
 
               TRANSACTIONS THROUGH PROCESSING ORGANIZATIONS
 
               You may purchase or sell Fund shares through a broker-dealer,
               bank or other financial institution, or an organization that
               provides recordkeeping and consulting services to 401(k) plans or
               other employee benefit plans (a "Processing Organization").
               Processing Organizations may charge you a fee for this service
               and may require different minimum initial and subsequent
               investments than the Funds. Processing Organizations may also
               impose other charges or restrictions different from those
               applicable to shareholders who invest in the Funds directly. A
               Processing Organization, rather than its customers, may be the
               shareholder of record of your shares. The Funds are not
               responsible for the failure of any
 
                                                        Shareholder's manual  47
<PAGE> 
 
               Processing Organization to carry out its obligations to its
               customers. Certain Processing Organizations may receive
               compensation from Janus Capital or its affiliates and certain
               Processing Organizations may receive compensation from the Funds
               for shareholder recordkeeping and similar services.
 
               TAXPAYER IDENTIFICATION NUMBER
 
               On the application or other appropriate form, you will be asked
               to certify that your Social Security or taxpayer identification
               number is correct and that you are not subject to backup
               withholding for failing to report income to the IRS. If you are
               subject to the 31% backup withholding or you did not certify your
               taxpayer identification number, the IRS requires the Funds to
               withhold 31% of any dividends paid and redemption or exchange
               proceeds. In addition to the 31% backup withholding, you may be
               subject to a $50 fee to reimburse the Funds for any penalty that
               the IRS may impose.
 
               SHARE CERTIFICATES
               (FIXED-INCOME FUNDS ONLY)
 
   
               Most shareholders choose not to hold their shares in certificate
               form because account transactions such as exchanges and
               redemptions cannot be completed until the certificate has been
               returned to the Funds. The Fixed-Income Funds will issue share
               certificates upon written request only and reserve the right to
               charge a fee for this service. Share certificates will not be
               issued until the shares have been held for at least 15 days and
               will not be issued for accounts that do not meet the minimum
               investment requirements. Share certificates cannot be issued for
               retirement accounts. In addition, if the certificate is lost,
               there may be a replacement charge.
    
 
               Share certificates are not available for the Money Market Funds
               in order to maintain the general liquidity that is representative
               of a money market fund and to help facilitate transactions in
               shareholder accounts.
 
 48 Janus Income Funds
<PAGE> 
 
               INVOLUNTARY REDEMPTIONS
 
               The Funds reserve the right to close an account if the
               shareholder is deemed to engage in activities which are illegal
               or otherwise believed to be detrimental to the Funds.
 
               TELEPHONE TRANSACTIONS
 
               You may initiate many transactions by telephone. The Funds and
               their agents will not be responsible for any losses resulting
               from unauthorized transactions when procedures designed to verify
               the identity of the caller are followed.
 
               It may be difficult to reach an Investor Service Representative
               by telephone during periods of unusual market activity. If you
               are unable to reach a representative by telephone, please
               consider sending written instructions, stopping by a Service
               Center, calling the Janus XpressLine or visiting our Web site.
 
               TEMPORARY SUSPENSION OF SERVICES
 
               The Funds or their agents may, in case of emergency, temporarily
               suspend telephone transactions and other shareholder services.
 
               ADDRESS CHANGES
 
               To change the address on your account, call 1-800-525-3713 or
               send a written request signed by all account owners. Include the
               name of your Fund(s), the account number(s), the name(s) on the
               account and both the old and new addresses. Certain options may
               be suspended for 10 days following an address change unless a
               signature guarantee is provided.
 
               REGISTRATION CHANGES
 
               To change the name on an account, the shares are generally
               transferred to a new account. In some cases, legal documentation
               may be required. For more information, call 1-800-525-3713.
 
                                                        Shareholder's manual  49
<PAGE> 
 
               STATEMENTS AND REPORTS
 
               Investors participating in an automatic investment program will
               receive quarterly confirmations of all transactions. Dividend
               information will be confirmed quarterly. In addition, the Funds
               will send you an immediate transaction confirmation statement
               after every non-systematic transaction.
 
   
               The Funds produce financial reports, which include a list of each
               of the Fund's portfolio holdings, semiannually and update their
               prospectus annually. To reduce expenses, the Funds may choose to
               mail only one report or prospectus to your household, even if
               more than one person in the household has a Fund account. Please
               call 1-800-525-3713 if you would like to receive additional
               reports or prospectuses. The Funds reserve the right to charge a
               fee for additional statement and report requests.
    
 
 50 Janus Income Funds
<PAGE> 
                                                         Management of the funds
 
INVESTMENT ADVISER
 
               Janus Capital Corporation, 100 Fillmore Street, Denver, Colorado
               80206-4928, is the investment adviser to each of the Funds and is
               responsible for the day-to-day management of their investment
               portfolios and other business affairs of the Funds.
 
               Janus Capital began serving as investment adviser to Janus Fund
               in 1970 and currently serves as investment adviser to all of the
               Janus 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 the Funds' investments. Janus Capital also furnishes
               certain administrative, compliance and accounting services for
               the Funds, and may be reimbursed by the Fixed-Income Funds 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 Funds and pays the salaries, fees
               and expenses of all Fund officers and those Trustees who are
               affiliated with Janus Capital. The Funds pay all of their
               expenses not assumed by Janus Capital, including auditing fees
               and independent Trustees' fees and expenses. (Janus Capital
               provides these services to the Money Market Funds pursuant to an
               Administration Agreement as described in the SAI.)
 
FIXED-INCOME FUNDS
 
               The Funds pay Janus Capital a management fee which is calculated
               daily and paid monthly. The advisory agreement with the Funds
               spells out the management fee and other expenses that the Funds
               must pay.
 
               Each Fixed-Income Fund incurs expenses not assumed by Janus
               Capital, including 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. The Annual Fund
               Operating Expenses table on page 11 lists the actual management
               fees and total operating expenses with and without waivers of
               each Fund for the most recent fiscal year.
 
                                                     Management of the funds  51
<PAGE> 
 
MONEY MARKET FUNDS
 
   
               Each of the Money Market Funds has agreed to compensate Janus
               Capital for its advisory services by the monthly payment of a fee
               at the annual rate of 0.20% of the value of the average daily net
               assets of each Money Market Fund. However, Janus Capital has
               agreed to waive a portion of its fee and accordingly, the
               advisory fee of each Money Market Fund will be calculated at the
               annual rate of 0.10% of the value of each Money Market Fund's
               average daily net assets. Janus Capital has agreed to continue
               such waivers until at least the next annual renewal of the
               advisory agreements. You will be notified of any change in this
               limit.
    
 
INVESTMENT PERSONNEL
 
   
PORTFOLIO MANAGERS
    
 
SHARON S. PICHLER
- --------------------------------------------------------------------------------
   
                   is Executive Vice President of Janus Money Market Fund,
                   Janus Government Money Market Fund and Janus Tax-Exempt
                   Money Market Fund. She is portfolio manager of Janus Money
                   Market Fund and Janus Tax-Exempt Money Market Fund, which
                   she has managed since inception. She previously served as
                   portfolio manager of Janus Government Money Market Fund
                   from inception to February 1999. She holds a Bachelor of
                   Arts in Economics from Michigan State University and a
                   Master of Business Administration from the University of
                   Texas at San Antonio. Ms. Pichler received the Chartered
                   Financial Analyst designation.
    
 
 52 Janus Income Funds
<PAGE> 
 
SANDY R. RUFENACHT
- --------------------------------------------------------------------------------
                   is Executive Vice President and portfolio manager of Janus
                   Short-Term Bond Fund and Janus High-Yield Fund. He has
                   managed Janus Short-Term Bond Fund since January 1996 and
                   has served as manager or co-manager of Janus High-Yield
                   Fund since June 1996. He previously served as Executive
                   Vice President and co-manager of Janus Flexible Income
                   Fund from June 1996 to February 1998. He holds a Bachelor
                   of Arts in Business from the University of Northern
                   Colorado.
 
RONALD V. SPEAKER
- --------------------------------------------------------------------------------
                   is Executive Vice President and portfolio manager of Janus
                   Flexible Income Fund, which he has managed or co-managed
                   since December 1991. He previously served as co-manager of
                   Janus High-Yield Fund from its inception to February 1998
                   and manager of Janus Short-Term Bond Fund and Janus
                   Federal Tax-Exempt Fund from their inceptions through
                   December 1995. He holds a Bachelor of Arts in Finance from
                   the University of Colorado and received 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.
 
                                                     Management of the funds  53
<PAGE> 
 
   
J. ERIC THORDERSON
    
- --------------------------------------------------------------------------------
   
                   is portfolio manager of Janus Government Money Market Fund
                   which he has managed since February 1999. Prior to
                   assuming management of the Fund, he served as assistant
                   portfolio manager of Janus Money Market Fund, Janus
                   Government Money Market Fund and Janus Tax-Exempt Money
                   Market Fund. He joined Janus Capital in May 1996 as a
                   senior fixed income analyst. Prior to joining Janus
                   Capital, he was a portfolio manager for USAA Investment
                   Management Company from 1991 to 1996. He holds a Bachelor
                   of Arts in Business Administration from Wayne State
                   University and a Master's Degree in Business
                   Administration from the University of Illinois. Mr.
                   Thorderson received the Chartered Financial Analyst
                   designation.
    
 
DARRELL W. WATTERS
- --------------------------------------------------------------------------------
                   is Executive Vice President and portfolio manager of Janus
                   Federal Tax-Exempt Fund, which he has managed since
                   January 1996. He holds a Bachelor of Arts in Economics
                   from Colorado State University.
 
   
ASSISTANT PORTFOLIO MANAGER
    
 
   
JEANINE M. MORRONI
    
- --------------------------------------------------------------------------------
   
                   is assistant portfolio manager of Janus Government Money
                   Market Fund. Ms. Morroni joined Janus Capital in January
                   1994 as a Fund Accountant and began trading short-term
                   securities in July 1994. She has been a credit analyst for
                   the Money Market Funds since 1996. Prior to joining Janus
                   Capital, she worked as a Fund Accountant at Oppenheimer
                   Management Corporation. She holds a Bachelor of Science in
                   Accounting from Colorado State University. She is a
                   candidate for the Chartered Financial Analyst designation.
    
 
 54 Janus Income Funds
<PAGE> 
                                                               Other information
 
               CLASSES OF SHARES
 
               Each of the Money Market Funds currently offers three classes of
               shares. This Prospectus only describes the Investor Shares of the
               Money Market Funds which are available to the general public.
               Institutional Shares of the Money Market Funds are available only
               to institutional clients, including corporations, foundations and
               trusts, and individuals meeting certain initial investment
               requirements. A third class of shares, Service Shares of the
               Money Market Funds are available only to banks and other
               financial institutions that meet minimum investment requirements
               in connection with trust accounts, cash management programs and
               similar programs. If you would like additional information,
               please call 1-800-525-3713.
 
               SIZE OF FUNDS
 
   
               Although there is no present intention to do so, the Funds may
               discontinue sales of their shares if management and the Trustees
               believe that continued sales may adversely affect a Fund's
               ability to achieve its investment objective. If sales of a Fund
               are discontinued, it is expected that existing shareholders of
               that Fund would be permitted to continue to purchase shares and
               to reinvest any dividends or capital gains distributions, absent
               highly unusual circumstances.
    
 
               YEAR 2000
 
               Preparing for Year 2000 is a high priority for Janus Capital,
               which has established a dedicated group to address this issue.
               Janus Capital has devoted considerable internal resources and has
               engaged one of the foremost experts in the field to help achieve
               Year 2000 readiness. Janus Capital does not anticipate that Year
               2000-related issues will have a material impact on its ability to
               continue to provide the Funds with service at current levels;
               however, Janus Capital cannot make any assurances that the steps
               it has taken to ensure Year 2000 readiness will be successful. In
               addition, there can be no assurance that Year 2000 issues will
               not affect the companies in which the Funds invest or worldwide
               markets and economies.
 
                                                           Other information  55
<PAGE> 
Distributions and taxes
 
DISTRIBUTIONS
 
   
               To avoid taxation of the Funds, the Internal Revenue Code
               requires each Fund to distribute net income and any net capital
               gains realized on its investments annually. A Fund'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.
    
 
FIXED-INCOME FUNDS
 
               Income dividends for the Fixed-Income Funds are declared daily,
               Saturdays, Sundays and holidays included, and are generally paid
               as of the last business day of each month. If a month begins on a
               Saturday, Sunday or holiday, dividends for those days are paid at
               the end of the preceding month. You will begin accruing income
               dividends the day after a purchase is effective. If shares are
               redeemed, you will receive all dividends accrued through the day
               of the redemption. Capital gains, if any, are declared and paid
               in December.
 
               HOW DISTRIBUTIONS AFFECT A FUND'S NAV
 
               Distributions, other than daily income dividends, are paid to
               shareholders as of the record date of a distribution of a Fund,
               regardless of how long the shares have been held. Undistributed
               income and realized gains are included in each Fund's daily NAV.
               The share price of a Fund drops by the amount of the
               distribution, net of any subsequent market fluctuations. As an
               example, assume that on December 31, Janus Flexible Income Fund
               declared a dividend in the amount of $0.25 per share. If Janus
               Flexible Income Fund's share price was $10.00 on December 30, the
               Fund's share price on December 31 would be $9.75, barring market
               fluctuations. Shareholders should be aware that distributions
               from a taxable mutual fund are not value-enhancing and may create
               income tax obligations. Capital gains distributions, if any, from
               Janus Federal Tax-Exempt Fund will also be taxable.
 
 56 Janus Income Funds
<PAGE> 
 
               "BUYING A DIVIDEND"
 
               If you purchase shares of a Fund just before the distribution,
               you will pay the full price for the shares and receive a portion
               of the purchase price back as a taxable distribution. This is
               referred to as "buying a dividend." In the above example, if you
               bought shares on December 30, you would have paid $10.00 per
               share. On December 31, the Fund would pay you $0.25 per share as
               a dividend and your shares would now be worth $9.75 per share.
               Unless your account is set up as a tax-deferred account,
               dividends paid to you would be included in your gross income for
               tax purposes, even though you may not have participated in the
               increase in NAV of the Fund, whether or not you reinvested the
               dividends.
 
MONEY MARKET FUNDS
 
               For the Money Market Funds, dividends representing substantially
               all of the net investment income and any net realized gains on
               sales of securities are declared daily, Saturdays, Sundays and
               holidays included, and distributed on the last business day of
               each month. If a month begins on a Saturday, Sunday or holiday,
               dividends for those days are declared at the end of the preceding
               month and distributed on the first business day of the month.
 
               Shares of the Money Market Funds purchased by wire on a day on
               which the Funds calculate their net asset value and the Federal
               Reserve Banks are open ("bank business day") will receive that
               day's dividend if the purchase is effected prior to 3:00 p.m.
               (New York time) for Janus Money Market Fund, 5:00 p.m. for Janus
               Government Money Market Fund and 12:00 p.m. for Janus Tax-Exempt
               Money Market Fund. Otherwise, such Shares begin to accrue
               dividends on the following bank business day. Purchase orders
               accompanied by a check or other negotiable bank draft will be
               accepted and effected as of 4:00 p.m. (New York time) (5:00 p.m.
               for Janus Government Money Market Fund), on the business day of
               receipt and such Shares will begin to accrue dividends on the
               first bank business day following receipt of the order.
 
                                                     Distributions and taxes  57
<PAGE> 
 
   
               Redemption orders effected on any particular day will generally
               receive dividends declared through the day of redemption.
               However, redemptions made by wire which are received prior to
               3:00 p.m. (New York time) for the Janus Money Market Fund, 5:00
               p.m. for Janus Government Money Market Fund and 12:00 p.m. for
               Janus Tax-Exempt Money Market Fund on a bank business day will
               result in Shares being redeemed that day. Proceeds of such a
               redemption will normally be sent to the predesignated account on
               that day, and that day's dividend will not be received. Requests
               for redemptions made by wire which are received after these times
               will be processed on that day and receive that day's dividend,
               but will not be wired until the following bank business day.
    
 
               The Funds reserve the right to require purchase and redemption
               requests and payments prior to these times on days when the bond
               market or NYSE close early.
 
DISTRIBUTION OPTIONS
 
               When you open an account, you must specify on your application
               how you want to receive your distributions. You may change your
               distribution option at any time by writing the Funds at one of
               the addresses on page 32 or calling 1-800-525-3713. The Funds
               offer the following options:
 
               1. REINVESTMENT OPTION. You may reinvest your income dividends
                  and capital gains distributions in additional shares. This
                  option is assigned automatically if no other choice is made.
 
               2. CASH OPTION. You may receive your income dividends and capital
                  gains distributions in cash.
 
               3. REINVEST AND CASH OPTION (THE FIXED-INCOME FUNDS ONLY). You
                  may receive either your income dividends or capital gains
                  distributions in cash and reinvest the other in additional
                  shares.
 
               4. REDIRECT OPTION. You may direct your dividends or capital
                  gains distributions (dividends in the case of the Money Market
                  Funds) to purchase shares of another Janus fund.
 
 58 Janus Income Funds
<PAGE> 
 
               The Funds reserve the right to reinvest into your account
               undeliverable and uncashed dividend and distribution checks that
               remain outstanding for six months in shares of the applicable
               Fund at the NAV next computed after the check is cancelled.
               Subsequent distributions may also be reinvested.
 
TAXES
 
               As with any investment, you should consider the tax consequences
               of investing in the Funds. Any time you sell or exchange shares
               of a Fund in a taxable account, it is considered a taxable event.
               Depending on the purchase price and the sale price, you may have
               a gain or loss on the transaction. Any tax liabilities generated
               by your transactions are your responsibility.
 
               The following discussion does not apply to tax-deferred accounts,
               nor is it a complete analysis of the federal tax implications of
               investing in the Funds. You may wish to consult your own tax
               adviser. Additionally, state or local taxes may apply to your
               investment, depending upon the laws of your state of residence.
 
               TAXES ON DISTRIBUTIONS
               Janus Federal Tax-Exempt Fund and Janus Tax-Exempt Money Market
               Fund anticipate that substantially all their income dividends
               will be exempt from federal income tax, although either Fund may
               occasionally earn income on taxable investments and dividends
               attributable to that income would be taxable. These Funds may be
               subject to state and local income tax. In addition, interest from
               certain private activity bonds is a preference item for purposes
               of the alternative minimum tax, and to the extent a Fund earns
               such income, shareholders subject to the alternative minimum tax
               must include that income as a preference item. Distributions from
               capital gains, if any, are subject to federal tax. The Funds will
               advise shareholders of the percentage of dividends, if any,
               subject to any federal tax.
 
               Dividends and distributions for all of the other Funds are
               subject to federal income tax, regardless of whether the
               distribution is made in cash or reinvested in additional shares
               of a Fund.
 
                                                     Distributions and taxes  59
<PAGE> 
 
               Distributions may be taxable at different rates depending on the
               length of time a Fund holds a security. In certain states, a
               portion of the dividends and distributions (depending on the
               sources of a Fund's income) may be exempt from state and local
               taxes. Information regarding the tax status of income dividends
               and capital gains distributions will be mailed to shareholders on
               or before January 31st of each year. Account tax information will
               also be sent to the IRS.
 
               TAXATION OF THE FUNDS
               Dividends, interest, and some capital gains received by the Funds
               on foreign securities may be subject to tax withholding or other
               foreign taxes. The Funds 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 an election is not made, any foreign taxes paid or accrued
               will represent an expense to the Funds.
 
               The Funds do not expect to pay federal income or excise taxes
               because they intend to meet certain requirements of the Internal
               Revenue Code. It is important that the Funds meet these
               requirements so that any earnings on your investment will not be
               taxed twice.
 
 60 Janus Income Funds
<PAGE> 
                                                            Financial highlights
 
   
               The financial highlights tables are intended to help you
               understand the Funds' financial performance for the past 5 years
               through October 31st of each fiscal year shown (or for Funds with
               a performance history shorter than 5 years, through October 31st
               of each fiscal period shown). Items 1 through 8 reflect financial
               results for a single Fund share. The total returns in the tables
               represent the rate that an investor would have earned (or lost)
               on an investment in each of the Funds (assuming reinvestment of
               all dividends and distributions). This information has been
               audited by PricewaterhouseCoopers LLP, whose report, along with
               the Funds' financial statements, are included in the Annual
               Report, which is available upon request and incorporated by
               reference into the SAI.
    
 
   
<TABLE>
<CAPTION>
                              JANUS FLEXIBLE INCOME FUND
- --------------------------------------------------------------------------------------
                                                   Periods ending October 31st
                                            1998     1997     1996     1995     1994
<S>                                        <C>      <C>      <C>      <C>      <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD  $10.00   $ 9.65   $ 9.55   $ 8.96    $10.03
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                   0.67     0.69     0.73     0.72      0.74
  3. Net gains or (losses) on securities
     (both realized and unrealized)          0.12     0.37     0.10     0.59     (0.86)
  4. Total from investment operations        0.79     1.06     0.83     1.31     (0.12)
     LESS DISTRIBUTIONS:
  5. Dividends (from net investment
     income)                                (0.67)   (0.69)   (0.73)   (0.72)    (0.72)
  6. Distributions (from capital gains)     (0.21)   (0.02)      --       --     (0.23)
  7. Total distributions                    (0.88)   (0.71)   (0.73)   (0.72)    (0.95)
  8. NET ASSET VALUE, END OF PERIOD        $ 9.91   $10.00   $ 9.65   $ 9.55    $ 8.96
  9. Total return                            8.14%   11.48%    9.01%   15.35%    (1.26%)
 10. Net assets, end of period (in
     millions)                             $1,104   $  727   $  604   $  580    $  377
 11. Average net assets for the period
     (in millions)                         $  893   $  656   $  604   $  450    $  429
 12. Ratio of gross expenses to average
     net assets                              0.84%    0.87%    0.88%    0.96%      N/A
 13. Ratio of net expenses to average net
     assets                                  0.82%    0.86%    0.87%    0.96%     0.93%
 14. Ratio of net investment income to
     average net assets                      6.68%    7.10%    7.60%    7.91%     7.75%
 15. Portfolio turnover rate                  148%     207%     214%     250%      137%
- --------------------------------------------------------------------------------------
</TABLE>
    
 
                                                        Financial highlights  61
<PAGE> 
 
   
<TABLE>
<CAPTION>
                                JANUS HIGH-YIELD FUND
- -------------------------------------------------------------------------------------
                                                         Periods ending October 31st
                                                         1998       1997      1996(1)
<S>                                                     <C>        <C>        <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD               $11.83     $11.12     $10.00
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                                0.90       0.97       0.80
  3. Net gains or (losses) on securities (both
     realized and unrealized)                            (1.02)      0.82       1.12
  4. Total from investment operations                    (0.12)      1.79       1.92
     LESS DISTRIBUTIONS:
  5. Dividends (from net investment income)              (0.90)     (0.97)     (0.80)
  6. Distributions (from capital gains)                  (0.56)     (0.11)         --
  7. Total distributions                                 (1.46)     (1.08)     (0.80)
  8. NET ASSET VALUE, END OF PERIOD                     $10.25     $11.83     $11.12
  9. Total return*                                       (1.45%)    16.94%     19.71%
 10. Net assets, end of period (in millions)            $  268     $  301     $  211
 11. Average net assets for the period (in millions)    $  381     $  266     $   88
 12. Ratio of gross expenses to average net assets**      0.99%      1.03%(2)   1.01%(2)
 13. Ratio of net expenses to average net assets**        0.96%      1.00%      1.00%
 14. Ratio of net investment income to average net
     assets**                                             7.85%      8.45%      9.00%
 15. Portfolio turnover rate**                             336%       404%       324%
- -------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Fiscal period from December 29, 1995 (inception) to October 31, 1996.
(2) The ratio was 1.04% in 1997 and 1.18% in 1996 before waiver of certain Fund
    expenses.
  * Total return is not annualized for periods of less than one full year.
 ** Annualized for periods of less than one full year.
 
 62 Janus Income Funds
<PAGE> 
 
   
<TABLE>
<CAPTION>
                            JANUS FEDERAL TAX-EXEMPT FUND
- ---------------------------------------------------------------------------------------------------
                                                         Periods ending October 31st
                                               1998       1997       1996        1995      1994
<S>                                           <C>        <C>        <C>        <C>        <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD     $ 7.09     $ 6.92     $ 6.88     $ 6.45     $ 7.30
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                      0.34       0.35       0.36       0.36       0.36
  3. Net gains or (losses) on securities
     (both realized and unrealized)             0.18       0.17       0.04       0.43      (0.83)
  4. Total from investment operations           0.52       0.52       0.40       0.79      (0.47)
     LESS DISTRIBUTIONS:
  5. Dividends (from net investment income)    (0.34)     (0.35)     (0.36)     (0.36)     (0.36)
  6. Distributions (from capital gains)           --         --         --         --      (0.02)
  7. Total distributions                       (0.34)     (0.35)     (0.36)     (0.36)     (0.38)
  8. NET ASSET VALUE, END OF PERIOD           $ 7.27     $ 7.09     $ 6.92     $ 6.88     $ 6.45
  9. Total return                               7.65%      7.72%      5.94%     12.60%     (6.62%)
 10. Net assets, end of period (in
     millions)                                $   92     $   62     $   45     $   33     $   26
 11. Average net assets for the period (in
     millions)                                $   74     $   54     $   36     $   29     $   28
 12. Ratio of gross expenses to average net
     assets                                     0.67%(2)   0.66%(2)   0.68%(2)   0.70%(2)    N/A
 13. Ratio of net expenses to average net
     assets                                     0.65%      0.65%      0.65%      0.65%      0.65%(2)
 14. Ratio of net investment income to
     average net assets                         4.76%      5.00%      5.18%      5.43%      5.20%
 15. Portfolio turnover rate                     227%       304%       225%       164%       160%
- ---------------------------------------------------------------------------------------------------
</TABLE>
    
 
   
(2) The ratio was 0.99% in 1998; 1.11% in 1997; 1.14% in 1996; 1.31% in 1995;
    and 1.41% in 1994 before waiver of certain Fund expenses.
    
 
                                                        Financial highlights  63
<PAGE> 
 
   
<TABLE>
<CAPTION>
                              JANUS SHORT-TERM BOND FUND
- ---------------------------------------------------------------------------------------------------
                                                     Periods ending October 31st
                                               1998     1997     1996    1995     1994
<S>                                           <C>      <C>      <C>      <C>     <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD     $ 2.90     $ 2.86     $ 2.84     $ 2.87     $ 3.02
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                      0.17       0.17       0.16       0.18       0.18
  3. Net gains or (losses) on securities
     (both realized and unrealized)             0.01       0.04       0.02      (0.03)     (0.15)
  4. Total from investment operations           0.18       0.21       0.18       0.15       0.03
     LESS DISTRIBUTIONS:
  5. Dividends (from net investment income)    (0.17)     (0.17)     (0.16)     (0.18)     (0.17)
  6. Distributions (from capital gains)           --         --         --         --      (0.01)
  7. Total distributions                       (0.17)     (0.17)     (0.16)     (0.18)     (0.18)
  8. NET ASSET VALUE, END OF PERIOD           $ 2.91     $ 2.90     $ 2.86     $ 2.84     $ 2.87
  9. Total return                               6.49%      7.70%      6.49%      5.55%      1.26%
 10. Net assets, end of period (in millions)  $  141     $   58     $   41     $   48     $   54
 11. Average net assets for the period (in
     millions)                                $   90     $   48     $   42     $   47     $   60
 12. Ratio of gross expenses to average net
     assets                                     0.67%(2)   0.67%(2)   0.67%(2)   0.66%(2)    N/A
 13. Ratio of net expenses to average net
     assets                                     0.65%      0.65%      0.65%      0.65%      0.65%(2)
 14. Ratio of net investment income to
     average net assets                         5.91%      6.03%      5.57%      6.67%      6.08%
 15. Portfolio turnover rate                     101%       133%       486%       337%       346%
- ---------------------------------------------------------------------------------------------------
</TABLE>
    
 
   
(2) The ratio was 1.06% in 1998; 1.20% in 1997; 1.23% in 1996; 1.23% in 1995;
    and 1.15% in 1994 before waiver of certain Fund expenses.
    
 
 64 Janus Income Funds
<PAGE> 
 
   
<TABLE>
<CAPTION>
                      JANUS MONEY MARKET FUND - INVESTOR SHARES
- ---------------------------------------------------------------------------------------------------
                                                            Periods ending October 31st
                                                        1998       1997        1996    1995(1)
<S>                                                    <C>     <C>     <C>     <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD              $ 1.00     $ 1.00     $ 1.00     $ 1.00
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                               0.05       0.05       0.05       0.04
  3. Net gains or (losses) on securities (both
     realized and unrealized)                              --         --         --         --
  4. Total from investment operations                    0.05       0.05       0.05       0.04
     LESS DIVIDENDS AND DISTRIBUTIONS:
  5. Dividends (from net investment income)             (0.05)     (0.05)     (0.05)     (0.04)
  6. Distributions (from capital gains)                    --         --         --         --
  7. Total dividends and distributions                  (0.05)     (0.05)     (0.05)     (0.04)
  8. NET ASSET VALUE, END OF PERIOD                    $ 1.00     $ 1.00     $ 1.00     $ 1.00
  9. Total return*                                       5.25%      5.23%      5.13%      3.95%
 10. Net assets, end of period (in millions)           $1,492     $1,033     $  774     $  643
 11. Average net assets for the period (in millions)   $1,124     $  883     $  676     $  461
 12. Ratio of expenses to average net assets**           0.60%(2)   0.60%(2)   0.60%(2)   0.60%(2)
 13. Ratio of net investment income to average net
     assets**                                            5.13%      5.09%      5.01%      5.56%
- ---------------------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Fiscal period from February 15, 1995 (inception) to October 31, 1995.
(2) The ratio of expenses to average net assets was 0.70% before waiver.
  * Total return is not annualized for periods of less than one full year.
 ** Annualized for periods of less than one full year.
 
                                                        Financial highlights  65
<PAGE> 
 
   
<TABLE>
<CAPTION>
                 JANUS GOVERNMENT MONEY MARKET FUND - INVESTOR SHARES
- ---------------------------------------------------------------------------------------------------
                                                                Periods ending October 31st
                                                        1998       1997        1996     1995(1)
<S>                                                    <C>     <C>     <C>     <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD              $ 1.00     $ 1.00     $ 1.00     $ 1.00
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                               0.05       0.05       0.05       0.04
  3. Net gains or (losses) on securities (both
     realized and unrealized)                              --         --         --         --
  4. Total from investment operations                    0.05       0.05       0.05       0.04
     LESS DIVIDENDS AND DISTRIBUTIONS:
  5. Dividends (from net investment income)             (0.05)     (0.05)     (0.05)     (0.04)
  6. Distributions (from capital gains)                    --         --         --       --
  7. Total dividends and distributions                  (0.05)     (0.05)     (0.05)     (0.04)
  8. NET ASSET VALUE, END OF PERIOD                    $ 1.00     $ 1.00     $ 1.00     $ 1.00
  9. Total return*                                       5.12%      5.11%      5.03%      3.90%
 10. Net assets, end of period (in millions)           $  213     $  132     $  117     $  199
 11. Average net assets for the period (in millions)   $  151     $  123     $  112     $   88
 12. Ratio of expenses to average net assets**           0.60%(2)   0.60%(2)   0.60%(2)   0.60%(2)
 13. Ratio of net investment income to average net
     assets**                                            5.01%      5.42%      4.91%      5.40%
- ---------------------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Fiscal period from February 15, 1995 (inception) to October 31, 1995.
(2) The ratio of expenses to average net assets was 0.70% before waiver.
  * Total return is not annualized for periods of less than one full year.
 ** Annualized for periods of less than one full year.
 
 66 Janus Income Funds
<PAGE> 
 
   
<TABLE>
<CAPTION>
                 JANUS TAX-EXEMPT MONEY MARKET FUND - INVESTOR SHARES
- ---------------------------------------------------------------------------------------------------
                                                              Periods ending October 31st
                                                         1998       1997      1996      1995(1)
<S>                                                    <C>     <C>     <C>     <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD              $ 1.00     $ 1.00     $ 1.00     $ 1.00
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                               0.03       0.03       0.03       0.02
  3. Net gains or (losses) on securities (both
     realized and unrealized)                              --         --         --         --
  4. Total from investment operations                    0.03       0.03       0.03       0.02
     LESS DIVIDENDS AND DISTRIBUTIONS:
  5. Dividends (from net investment income)             (0.03)     (0.03)     (0.03)     (0.02)
  6. Distributions (from capital gains)                    --         --         --         --
  7. Total dividends and distributions                  (0.03)     (0.03)     (0.03)     (0.02)
  8. NET ASSET VALUE, END OF PERIOD                    $ 1.00     $ 1.00     $ 1.00     $ 1.00
  9. Total return*                                       3.23%      3.20%      3.27%      2.40%
 10. Net assets, end of period (in millions)           $  105     $   81     $   75     $   67
 11. Average net assets for the period (in millions)   $   91     $   76     $   69     $   57
 12. Ratio of expenses to average net assets**           0.60%(2)   0.60%(2)   0.60%(2)   0.60%(2)
 13. Ratio of net investment income to average net
     assets**                                            3.16%      3.14%      3.22%      3.38%
- ---------------------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Fiscal period from February 15, 1995 (inception) to October 31, 1995.
(2) The ratio of expenses to average net assets was 0.70% before waiver.
  * Total return is not annualized for periods of less than one full year.
 ** Annualized for periods of less than one full year.
 
                                                        Financial highlights  67
<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 Fixed-
               Income Funds may invest. The Fixed-Income Funds may invest in
               these instruments to the extent permitted by their investment
               objectives and policies. The Fixed-Income Funds 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.
 
               CERTIFICATES OF PARTICIPATION ("COPS") are certificates
               representing an interest in a pool of securities. Holders are
               entitled to a proportionate interest in the underlying
               securities. Municipal lease obligations are often sold in the
               form of COPs. See "Municipal lease obligations" below.
 
               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
               Funds 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.
 
 68 Janus Income Funds
<PAGE> 
 
               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 SECURITIES are securities 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 securities include "lower
               rated bonds," "noninvestment grade bonds" and "junk bonds."
 
               INDUSTRIAL DEVELOPMENT BONDS are revenue bonds that are issued by
               a public authority but which may be backed only by the credit and
               security of a private issuer and may involve greater credit risk.
               See "Municipal securities" below.
 
               MORTGAGE- AND ASSET-BACKED SECURITIES are shares in a pool of
               mortgages or other debt. These securities are generally pass-
 
                                                Glossary of investment terms  69
<PAGE> 
 
               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.
 
               MUNICIPAL LEASE OBLIGATIONS are revenue bonds backed by leases or
               installment purchase contracts for property or equipment. Lease
               obligations may not be backed by the issuing municipality's
               credit and may involve risks not normally associated with general
               obligation bonds and other revenue bonds. For example, their
               interest may become taxable if the lease is assigned and the
               holders may incur losses if the issuer does not appropriate funds
               for the lease payments on an annual basis, which may result in
               termination of the lease and possible default.
 
               MUNICIPAL SECURITIES are bonds or notes issued by a U.S. state or
               political subdivision. A municipal security may be a general
               obligation backed by the full faith and credit (i.e., the
               borrowing and taxing power) of a municipality or a revenue
               obligation paid out of the revenues of a designated project,
               facility or revenue source.
 
               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 Funds
               must pay if these investments are profitable, the Funds may make
               various elections permitted by the tax laws. These elections
               could require that the Funds recognize taxable income, which in
               turn
 
 70 Janus Income Funds
<PAGE> 
 
               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
               Fund and a simultaneous agreement by the seller (generally a bank
               or dealer) to repurchase the security from the Fund 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 Fund 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
               Fund to another party (generally a bank or dealer) in return for
               cash and an agreement by the Fund 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.
 
                                                Glossary of investment terms  71
<PAGE> 
 
               STANDBY COMMITMENTS are obligations purchased by a Fund from a
               dealer that give the Fund 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.
 
 72 Janus Income Funds
<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
               Funds 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
 
                                                Glossary of investment terms  73
<PAGE> 
 
               Funds 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 Funds 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 Funds
               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 Fund 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
 
 74 Janus Income Funds
<PAGE> 
 
               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 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 Funds may purchase and
               write put and call options on securities, securities indices and
               foreign currencies.
 
                                                Glossary of investment terms  75
<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>
 
 76 Janus Income Funds
<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.
                ............................ 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>
 
                                            Explanation of rating categories  77
<PAGE> 
 
               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.
 
SECURITIES HOLDINGS BY RATING CATEGORY
 
               During the fiscal period ended October 31, 1998, the percentage
               of securities holdings for the following Funds by rating category
               based upon a weighted monthly average was:
 
   
<TABLE>
<CAPTION>
                                        JANUS FLEXIBLE INCOME FUND
                --------------------------------------------------------------------------
                <S>                                             <C>
                    BONDS-S&P RATING:
                 AAA                                                         24%
                 AA                                                           2%
                 A                                                           13%
                 BBB                                                         18%
                 BB                                                          15%
                 B                                                           17%
                 CCC                                                          0%
                 CC                                                           0%
                 C                                                            0%
                 Preferred Stock                                              2%
                 Cash and Options                                             9%
                 TOTAL                                                      100%
                --------------------------------------------------------------------------
</TABLE>
    
 
 78 Janus Income Funds
<PAGE> 
 
   
<TABLE>
<CAPTION>
                                          JANUS HIGH-YIELD FUND
                --------------------------------------------------------------------------
                <S>                                             <C>
                    BONDS-S&P RATING:
                 AAA                                                          0%
                 AA                                                           0%
                 A                                                            0%
                 BBB                                                          0%
                 BB                                                           6%
                 B                                                           76%
                 CCC                                                          6%
                 CC                                                           0%
                 C                                                            0%
                 Preferred Stock                                              0%
                 Cash and Options                                            12%
                 TOTAL                                                      100%
                --------------------------------------------------------------------------
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                        JANUS SHORT-TERM BOND FUND
                --------------------------------------------------------------------------
                <S>                                             <C>
                    BONDS-S&P RATING:
                 AAA                                                         24%
                 AA                                                          20%
                 A                                                           31%
                 BBB                                                         10%
                 BB                                                           3%
                 B                                                            7%
                 CCC                                                          2%
                 CC                                                           0%
                 C                                                            0%
                 Preferred Stock                                              0%
                 Cash and Options                                             3%
                 TOTAL                                                      100%
                --------------------------------------------------------------------------
</TABLE>
    
 
   
               No other Fund described in this Prospectus held 5% or more of its
               assets in bonds rated below investment grade for the fiscal year
               ended October 31, 1998.
    
 
                                            Explanation of rating categories  79
<PAGE> 
 
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 80
<PAGE> 
 
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                                                                              81
<PAGE> 
 
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 82
<PAGE> 
 
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                                                                              83
<PAGE> 
 
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 84
<PAGE> 
 
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<PAGE> 
 
[JANUS LOGO]
          1-800-525-3713
          P.O. Box 173375
          Denver, Colorado 80217-3375
          janus.com
 
You can request other information, including a Statement of
Additional Information, Annual Report or Semiannual Report, free of
charge, by contacting Janus at 1-800-525-3713 or visiting our Web
site at janus.com. In the Funds' Annual Report, you will find a
discussion of the market conditions and investment strategies that
significantly affected the Funds' performance during their last
fiscal year. Other information is also available from financial
intermediaries that sell shares of the Funds.
 
The Statement of Additional Information provides detailed
information about the Funds and is incorporated into this Prospectus
by reference. You may review the Funds' Statement of Additional
Information at the Public Reference Room of the SEC or get text only
copies for a fee, by writing to or calling the Public Reference
Room, Washington, D.C. 20549-6009 (1-800-SEC-0330). You may obtain
the Statement of Additional Information for free from the SEC's Web
site at http://www.sec.gov.
 
              Investment Company Act File No. 811-1879
 
  3165
<PAGE> 
                                       [JANUS LOGO]
 
                         Janus Venture Fund
 
                                       PROSPECTUS
                                       FEBRUARY 17, 1999
 
                         THE FUND HAS DISCONTINUED PUBLIC SALES OF ITS SHARES
                         TO NEW INVESTORS, BUT SHAREHOLDERS WHO HAVE OPEN
                         FUND ACCOUNTS MAY MAKE ADDITIONAL INVESTMENTS AND
                         REINVEST DIVIDENDS AND CAPITAL GAINS DISTRIBUTIONS.
                         CURRENT SHAREHOLDERS MAY ALSO OPEN ADDITIONAL FUND
                         ACCOUNTS UNDER CERTAIN CONDITIONS. IF A FUND ACCOUNT
                         IS CLOSED, HOWEVER, ADDITIONAL INVESTMENTS IN THE
                         FUND MAY NOT BE POSSIBLE.
 
                         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]
<PAGE> 
 
                                                               Table of contents
 
<TABLE>
                <S>                                               <C>
                RISK/RETURN SUMMARY
                   Janus Venture Fund...........................    2
                   Fees and expenses............................    4
                INVESTMENT OBJECTIVE, PRINCIPAL INVESTMENT
                  STRATEGIES AND RISKS
                   Investment objective and principal investment
                   strategies...................................    5
                   Risks........................................    9
                SHAREHOLDER'S MANUAL
                   Minimum investments..........................   16
                   Types of account ownership...................   16
                   How to open your Janus account...............   18
                   How to purchase shares.......................   19
                   How to exchange shares.......................   21
                   How to redeem shares.........................   23
                   Shareholder services and account policies....   27
                MANAGEMENT OF THE FUND
                   Investment adviser...........................   32
                   Portfolio managers...........................   33
                OTHER INFORMATION............... ...............   34
                DISTRIBUTIONS AND TAXES
                   Distributions................................   35
                   Taxes........................................   36
                FINANCIAL HIGHLIGHTS.............. .............   38
                GLOSSARY
                   Glossary of investment terms.................   39
 
</TABLE>
 
                                                            Table of contents  1
<PAGE> 
Risk return summary
 
JANUS VENTURE FUND
 
1. WHAT IS THE INVESTMENT OBJECTIVE OF JANUS VENTURE FUND?
 
               The Fund seeks capital appreciation.
 
   
               The Fund's Trustees may change this objective without a
               shareholder vote and the Fund will notify you of any changes that
               are material. If there is a material change in the Fund's
               objective or policies, you should consider whether the Fund
               remains an appropriate investment for you. There is no guarantee
               that the Fund will meet its objective.
    
 
2. WHAT ARE THE MAIN INVESTMENT STRATEGIES OF JANUS VENTURE FUND?
 
               The Fund invests in equity securities of U.S. and foreign
               companies selected for their potential for capital appreciation.
               The Fund normally invests at least 50% of its equity assets in
               small-sized companies.
 
               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 the portfolio
               managers are unable to find investments with earnings growth
               potential, a significant portion of the Fund's assets may be in
               cash or similar investments.
 
3. WHAT ARE THE MAIN RISKS OF INVESTING IN JANUS VENTURE FUND?
 
   
               The biggest risk of investing in this Fund is that its returns
               may vary and you could lose money. If you are considering
               investing in the Fund, remember that it is 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 the Fund's portfolio may decrease if the value of an
               individual company in the portfolio decreases. The value of the
               Fund's portfolio could also decrease if the stock market goes
               down. If the value of the Fund's portfolio decreases, the Fund's
               net asset value (NAV) will also decrease which means if you sell
               your shares in the Fund you would get back less money. Normally,
               the Fund invests at least 50% of its equity assets in
 
 2 Janus Venture Fund
<PAGE> 
 
               securities issued by small-sized companies, which tend to be more
               volatile than securities issued by larger or more established
               companies. As a result, the Fund's returns may be more volatile
               than one holding securities of large, established companies.
 
               An investment in the Fund is not a bank deposit and is not
               insured or guaranteed by the Federal Deposit Insurance
               Corporation or any other government agency.
 
               The following information illustrates how the Fund's performance
               has varied over time. The bar chart depicts the change in the
               Fund's performance from year-to-year during the periods
               indicated. The table compares the Fund's average annual returns
               for the periods indicated to a broad-based securities market
               index.
 
               JANUS VENTURE FUND

A BAR CHART showing Annual Total Returns for Janus Venture Fund from 1989 
through 1998:
   
               Annual returns for periods ended 12/31
 
38.74%   (0.40%)   47.82%   7.44%  9.08%   5.46%  26.46%  8.02%  12.62%   23.22%
 1989      1990     1991    1992   1993    1994    1995   1996    1997     1998

Each percentage is represented by a bar of proportionate size with the actual
total return printed above the bar.

                Best Quarter: 4th-1998 24.98%; Worst Quarter: 3rd-1998 (14.81%) 
    
 
                          Average annual total return for periods ended 12/31/98
                          ------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                                Since Inception
                                               1 year    5 years    10 years       (4/30/85)
                <S>                            <C>       <C>        <C>         <C>
                Janus Venture Fund              23.22%    14.86%      16.95%         16.89%
    
   
                Russell 2000(R) Index*          (2.55%)   11.87%      12.92%         12.05%
                                                ------------------------------------------
</TABLE>
    
 
               * The Russell 2000(R) Index is an index that measures the
                 performance of the 2,000 smallest companies in the Russell
                 3,000 Index with an average market capitalization of
                 approximately $421 million.
 
               The Fund's past performance does not necessarily indicate how it
               will perform in the future.
 
                                                          Risk return summary  3
<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 Fund.
 
               ANNUAL FUND OPERATING EXPENSES are paid out of the Fund'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 describes the fees and expenses that you may pay if
               you buy and hold shares of the Fund. It is based upon gross
               expenses (without the effect of expense offset arrangements) for
               the fiscal year ended October 31, 1998.
 
<TABLE>
<CAPTION>
                                                                 Janus Venture Fund
   <S>                                                           <C>              
   Management Fee                                                   0.68%
   Other Expenses                                                   0.26%
   Total Annual Fund Operating Expenses                             0.94%
</TABLE>
 
 
  EXAMPLE:
  This example is intended to help you compare the cost of investing in the
  Fund with the cost of investing in other mutual funds. The example
  assumes that you invest $10,000 in the Fund for the time periods
  indicated 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 Fund's 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    5 Years   10 Years
                                           ---------------------------------------
   <S>                                     <C>       <C>        <C>       <C>     
   Janus Venture Fund                       $96       $300       $520      $1,155
</TABLE>
 
 4 Janus Venture Fund
<PAGE> 
Investment objective, principal 
           investment strategies 
           and risks
 
               This section takes a closer look at the investment objective of
               the Fund, its principal investment strategies and certain risks
               of investing in the Fund. 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 9-11 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
 
               Janus Venture Fund seeks capital appreciation. Normally, the Fund
               pursues its objective by investing at least 50% of its equity
               assets in small-sized companies. Small-sized companies are those
               who have market capitalizations of less than $1 billion or annual
               gross revenues of less than $500 million. Companies whose
               capitalization or revenues fall outside these ranges after the
               Fund's initial purchase continue to be considered small-sized.
               The Fund may also invest in larger companies with strong growth
               potential or relatively well-known and large companies with
               potential for capital appreciation.
 
The following questions and answers are designed to help you better understand
the Fund's principal investment strategies.
 
1. HOW ARE COMMON STOCKS SELECTED?
 
               The Fund may invest substantially all of its assets in common
               stocks if its portfolio managers believe 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.
               Realization of income is not a significant consideration when
               choosing investments for the Fund. Income realized on the Fund's
               investments will be incidental to its objective.
 
              Investment objective, principal investment strategies and risks  5
<PAGE> 
 
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 Fund may invest and the Fund 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. As noted previously,
               market capitalization and annual gross revenues are important
               investment criteria for the Fund.
 
GENERAL PORTFOLIO POLICIES
 
               In investing its portfolio assets, the Fund will follow the
               general policies listed below. The percentage limitations
               included in these policies and elsewhere in this Prospectus apply
               only at the time of purchase of the security. So, for example, if
               the Fund exceeds a limit as a result of market fluctuations or
               the sale of securities, it will not be required to dispose of any
               securities.
 
               CASH POSITION
   
               When the Fund's portfolio managers believe that market conditions
               are unfavorable for profitable investing, or when they are
               otherwise unable to locate attractive investment opportunities,
               the Fund's cash or similar investments may increase. In other
               words, the Fund does not always stay fully invested in stocks.
               Cash or similar investments generally are a residual - they
               represent the
    
 
 6 Janus Venture Fund
<PAGE> 
 
               assets that remain after the portfolio managers have committed
               available assets to desirable investment opportunities. However,
               the portfolio managers may also temporarily increase the Fund's
               cash position to protect its assets or maintain liquidity. When
               the Fund'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 Fund remained more fully invested in
               stocks.
 
               OTHER TYPES OF INVESTMENTS
               The Fund invests primarily in a portfolio of equity securities,
               which may include preferred stocks, common stocks, warrants and
               securities convertible into common or preferred stocks, but it
               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 securities (less than 35% of the Fund's
                 assets)
    
 
   
               - options, futures, forwards 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
    
 
               ILLIQUID INVESTMENTS
               The Fund 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 the 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 Fund's Trustees,
               certain restricted securities may be deemed liquid, and will not
               be counted toward this 15% limit.
 
              Investment objective, principal investment strategies and risks  7
<PAGE> 
 
               FOREIGN SECURITIES
               The Fund may invest without limit in foreign equity and debt
               securities. The Fund 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
               The Fund may invest in special situations. A special situation
               arises when, in the opinion of the Fund's portfolio managers, 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. The Fund'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 Fund generally intends to purchase securities for long-term
               investment although, to a limited extent, the Fund 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. The Fund 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 the Fund's portfolio
               whenever its portfolio managers believe 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
 
 8 Janus Venture Fund
<PAGE> 
 
               costs and may also result in taxable capital gains. Higher costs
               associated with increased portfolio turnover may offset gains in
               the Fund's performance.
 
RISKS
 
               Because the Fund may invest substantially all of its assets in
               common stocks, the main risk is the risk that the value of the
               stocks it holds might decrease in response to the activities of
               an individual company or in response to general market and/or
               economic conditions. If this occurs, the Fund's share price may
               also decrease. The Fund'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 or companies with relatively small market
               capitalizations.
 
The following questions and answers are designed to help you better understand
some of the risks of investing in the Fund.
 
1. THE FUND NORMALLY INVESTS AT LEAST 50% OF ITS EQUITY ASSETS IN SECURITIES OF
   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.
 
              Investment objective, principal investment strategies and risks  9
<PAGE> 
 
2. I'VE HEARD A LOT ABOUT HOW THE CHANGE TO THE YEAR 2000 COULD AFFECT COMPUTER
   SYSTEMS. DOES THIS CREATE ANY SPECIAL RISKS?
 
               The portfolio managers carefully research each potential
               investment before making an investment decision and, among other
               things, consider Year 2000 readiness when selecting portfolio
               holdings. However, there is no guarantee that the information a
               portfolio manager receives regarding a company's Year 2000
               readiness is completely accurate. If a company has not
               satisfactorily addressed Year 2000 issues, the Fund's performance
               could suffer.
 
3. HOW COULD THE FUND'S INVESTMENTS IN FOREIGN SECURITIES AFFECT ITS
   PERFORMANCE?
 
               The Fund 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 Fund's performance may depend on
               issues other than the performance of a particular company. These
               issues include:
 
               - currency risk
 
               - political and economic risk
 
               - regulatory risk
 
               - market risk
 
               - transaction costs
 
   
               These risks are described in the SAI.
    
 
4. ARE THERE SPECIAL RISKS ASSOCIATED WITH INVESTMENTS IN HIGH-YIELD/HIGH-RISK
   SECURITIES?
 
   
               High-yield/high-risk securities (or "junk" bonds) are securities
               rated below investment grade by the primary rating agencies such
               as Standard & Poor's and Moody's. The value of lower quality
               securities generally is more dependent on credit risk, or the
               ability of the issuer to meet interest and principal payments,
               than
    
 
 10 Janus Venture Fund
<PAGE> 
 
               investment grade debt securities. Issuers of high-yield
               securities 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.
 
               Please refer to the SAI for a description of bond rating
               categories.
 
5. HOW DOES THE FUND TRY TO REDUCE RISK?
 
   
               The Fund may use futures, options and other derivative
               instruments to "hedge" or protect its portfolio from adverse
               movements in securities prices and interest rates. The Fund may
               also use a variety of currency hedging techniques, including
               forward currency contracts, to manage exchange rate risk. The
               Fund believes the use of these instruments will benefit the Fund.
               However, the Fund's performance could be worse than if the Fund
               had not used such instruments if the portfolio managers'
               judgement proves incorrect. Risks associated with the use of
               derivative instruments are described in the SAI.
    
 
             Investment objective, principal investment strategies and risks  11
<PAGE> 
 
Janus Venture Fund
<PAGE> 
 
                   Shareholder's
                   Manual
 
                   This section will help you become
                   familiar with the different types
                   of accounts you can establish with
                   Janus. It also explains in detail
                   the wide array of services and
                   features you can establish on your
                   account, as well as account
                   policies and fees that may apply
                   to your account. Account policies
                   (including fees), services and
                   features may be modified or
                   discontinued without shareholder
                   approval or prior notice.
 
                                                    [JANUS LOGO]
<PAGE> 
 
               Although the Fund has discontinued public sales of its shares to
               new investors, shareholders who maintain open accounts will be
               able to continue to purchase shares and reinvest any dividends
               and capital gains distributions in additional shares. In
               addition, the Fund will continue to accept new accounts which are
               opened under taxpayer identification numbers that are identical
               to those for existing Fund accounts.
 
               Once a Fund account is closed, it may not be reopened. An account
               may be considered closed and subject to redemption by the Fund in
               the circumstances discussed under "Involuntary Redemptions" on
               page 30.
 
HOW TO GET IN TOUCH WITH JANUS
 
               Janus offers two Investor Service Centers for those individuals
               who would like to conduct their investing in person. Our
               representatives will be happy to assist you at either of the
               following locations: Monday-Friday 7:00 a.m. to 6:00 p.m.
               Mountain time and Saturday 9:00 a.m. to 1:00 p.m. Mountain time.
 
               100 Fillmore Street, Suite 100
               Denver, CO 80206
 
               3773 Cherry Creek North Drive, Suite 101
               Denver, CO 80209
 
 14 Janus Venture Fund
<PAGE> 
 
   
 QUICK ADDRESS AND TELEPHONE REFERENCE
    
- --------------------------------------------------------------------------------
 
<TABLE>
  <S>                                           <C>
  MAILING ADDRESS                               JANUS XPRESSLINE(TM)
  Janus                                         1-888-979-7737
  P.O. Box 173375                               For 24-hour access to account
  Denver, CO 80217-3375                         and fund information,
                                                exchanges, purchases and
  FOR OVERNIGHT CARRIER                         redemptions, automated daily
  Janus                                         quotes on fund share prices,
  Suite 101                                     yields and total returns.
  3773 Cherry Creek North Drive
  Denver, CO 80209-3811                         TDD
                                                1-800-525-0056
  INVESTOR SERVICE REPRESENTATIVES              A telecommunications device
  If you have any questions while reading       for our hearing- and
  this Prospectus, please call one of our       speech-impaired shareholders.
  Investor Service Representatives at
  1-800-525-3713 Monday-Friday: 8:00            JANUS LITERATURE LINE
  a.m.-8:00 p.m., and Saturday: 10:00           1-800-525-8983
  a.m.-4:00 p.m., New York time.                To request a prospectus,
                                                shareholder reports or
  JANUS INTERNET ADDRESS                        marketing materials 24 hours a
  janus.com                                     day.
</TABLE>
 
                                                        Shareholder's manual  15
<PAGE> 
 
MINIMUM INVESTMENTS*
- ---------------------------------------------
 
<TABLE>
<S>                                 <C>
To open a new regular account        $2,500
To open a new retirement,
education or UGMA/UTMA account       $  500
To open a new regular account with
an Automatic Investment Program      $  500**
To add to any type of an account     $  100+
</TABLE>
 
 * The Fund reserves the right to
   change the amount of these
   minimums from time to time or
   to waive them in whole or in
   part for certain types of
   accounts.
** An Automatic Investment Program
   requires a $100 minimum
   automatic investment per month
   until the account balance
   reaches $2,500.
 + The minimum subsequent
   investment for IRA UGMA/UTMA
   accounts is $50.
 
TYPES OF ACCOUNT OWNERSHIP
 
               As discussed on page 14, the Fund will accept new accounts opened
               under taxpayer identification numbers identical to those on
               current Fund accounts. You can establish the following types of
               accounts by completing a New Account Application. To request an
               application, call 1-800-525-3713.
 
               INDIVIDUAL OR JOINT OWNERSHIP
               Individual accounts are owned by one person. Joint accounts have
               two or more owners.
 
               A GIFT OR TRANSFER TO MINOR (UGMA OR UTMA)
               An UGMA/ UTMA account is a custodial account managed for the
               benefit of a minor. To open an UGMA or UTMA account, you must
               include the minor's Social Security number on the application.
 
               TRUST
               An established trust can open an account. The names of each
               trustee, the name of the trust and the date of the trust
               agreement must be included on the application.
 
 16 Janus Venture Fund
<PAGE> 
 
               BUSINESS ACCOUNTS
               Corporations and partnerships may also open an account. The
               application must be signed by an authorized officer of the
               corporation or a general partner of the partnership.
 
TAX-DEFERRED ACCOUNTS
 
               If you are eligible, you may set up one or more tax-deferred
               accounts. A tax-deferred account allows you to shelter your
               investment income and capital gains from current income taxes. A
               contribution to certain of these plans may also be tax
               deductible. Tax-deferred accounts include retirement plans
               described below and the Education IRA. Distributions from these
               plans are generally subject to income tax and may be subject to
               an additional tax if withdrawn prior to age 59 1/2 or used for a
               nonqualifying purpose. Investors should consult their tax adviser
               or legal counsel before selecting a tax-deferred account.
 
   
               Investors Fiduciary Trust Company serves as custodian for the
               tax-deferred accounts offered by the Fund. You will be charged an
               annual account maintenance fee of $12 for each taxpayer
               identification number no matter how many tax-deferred accounts
               you have with Janus. You may pay the fee by check or have it
               automatically deducted from your account (usually in December).
               The custodian reserves the right to change the amount of this fee
               or to waive it in whole or in part for certain types of accounts.
    
 
               The following plans require a special application. For an
               application and more details about our Retirement Plans, call
               1-800-525-3713.
 
               TRADITIONAL AND ROTH INDIVIDUAL RETIREMENT ACCOUNTS
               Both types of IRAs allow most individuals with earned income to
               contribute up to the lesser of $2,000 ($4,000 for most married
               couples) or 100% of compensation annually. Please refer to the
               Janus IRA booklet for more complete information regarding the
               different types of IRAs.
 
                                                        Shareholder's manual  17
<PAGE> 
 
               EDUCATION IRA
               This plan allows individuals, subject to certain income
               limitations, to contribute up to $500 annually on behalf of any
               child under the age of 18. Please refer to the Janus IRA booklet
               for more complete information regarding the Education IRA.
 
               SIMPLIFIED EMPLOYEE PENSION PLAN
               This plan allows small business owners (including sole
               proprietors) to make tax-deductible contributions for themselves
               and any eligible employee(s). A SEP requires an IRA (a SEP-IRA)
               to be set up for each SEP participant.
 
               PROFIT SHARING OR MONEY PURCHASE PENSION PLAN
               These plans are open to corporations, partnerships and sole
               proprietors to benefit their employees and themselves.
 
               SECTION 403(B)(7) PLAN
               Employees of educational organizations or other qualifying, tax-
               exempt organizations may be eligible to participate in a Section
               403(b)(7) Plan.
 
HOW TO OPEN YOUR JANUS ACCOUNT
 
               If you are a current Fund shareholder and want to open another
               Fund account, complete and sign the appropriate application.
               Please be sure to provide your Social Security or taxpayer
               identification number on the application and make your check
               payable to Janus. The Fund is available only to U.S. citizens or
               residents, and your application will be returned to you if you do
               not meet these criteria. Send all items to one of addresses
               listed in the "Quick Address and Telephone Reference" on page 15.
 
 18 Janus Venture Fund
<PAGE> 
 
HOW TO PURCHASE SHARES
 
               PAYING FOR SHARES
 
               When you purchase shares, your request will be processed at the
               next NAV calculated after your order is received and accepted.
               Please note the following:
 
               - Cash, credit cards, third party checks and credit card checks
                 will not be accepted.
 
               - All purchases must be made in U.S. dollars.
 
               - Checks must be drawn on a U.S. bank and made payable to Janus.
 
               - If a check does not clear your bank, the Fund reserves the
                 right to cancel the purchase.
 
               - If the Fund is unable to debit your predesignated bank account
                 on the day of purchase, it may make additional attempts or
                 cancel the purchase.
 
               - The Fund reserves the right to reject any specific purchase
                 request.
 
               If your purchase is cancelled you will be responsible for any
               losses or fees imposed by your bank and losses that may be
               incurred as a result of any decline in the value of the cancelled
               purchase. The Fund (or its agents) has the authority to redeem
               shares in your account(s) to cover any such losses due to
               fluctuations in share price. Any profit on such cancellation will
               accrue to the Fund.
 
               ONCE YOU HAVE OPENED YOUR JANUS ACCOUNT, THE MINIMUM AMOUNT FOR
               AN ADDITIONAL INVESTMENT IS $100 ($50 FOR IRAS OR UGMA/UTMA
               ACCOUNTS). You may add to your account at any time through any of
               the following options:
 
               BY MAIL
 
               Complete the remittance slip attached at the bottom of your
               confirmation statement. If you are making a purchase into a
               retirement account, please indicate whether the purchase is a
 
                                                        Shareholder's manual  19
<PAGE> 
 
               rollover or a current or prior year contribution. Send your check
               made payable to Janus and remittance slip or written instructions
               to one of the addresses listed previously. You may also request a
               booklet of remittance slips for non-retirement accounts.
 
               BY TELEPHONE
 
               This service allows you to purchase additional shares quickly and
               conveniently through an electronic transfer of money. To purchase
               shares by telephone, call an Investor Service Representative at
               1-800-525-3713 during normal business hours or call the Janus
               XpressLine, 1-888-979-7737, for access to this option 24 hours a
               day. When you make an additional purchase by telephone, Janus
               will automatically debit your predesignated bank account for the
               desired amount. To establish the telephone purchase option on
               your new account, complete the "Telephone Purchase of Shares
               Option" section on the application and attach a "voided" check or
               deposit slip from your bank account. If your account is already
               established, call 1-800-525-3713 to request the appropriate form.
               This option will become effective ten business days after the
               form is received.
 
               BY WIRE
 
               Purchases may also be made by wiring money from your bank account
               to your Janus account. Call 1-800-525-3713 to receive wiring
               instructions.
 
               BY INTERNET
 
               You must pre-establish the "Telephone Purchase of Shares Option"
               to make a purchase on our Web site at janus.com. If you have
               questions, please call 1-800-975-9932 to speak to a Janus
               representative.
 
               AUTOMATIC INVESTMENT PROGRAMS
 
               Janus offers several automatic investment programs to help you
               achieve your financial goals as simply and conveniently as
 
 20 Janus Venture Fund
<PAGE> 
 
               possible. You may open a new account with a $500 initial purchase
               and $100 automatic subsequent investments.
 
               AUTOMATIC MONTHLY INVESTMENT PROGRAM
               You select the day each month that your money ($100 minimum) will
               be electronically transferred from your bank account to your Fund
               account. To establish this option, complete the "Automatic
               Monthly Investment Program" section on the application and attach
               a "voided" check from your bank account. If your Fund account is
               already established, call 1-800-525-3713 to request the
               appropriate form.
 
               PAYROLL DEDUCTION
               If your employer can initiate an automatic payroll deduction, you
               may have all or a portion of your paycheck ($100 minimum)
               invested directly into your Fund account. To obtain information
               on establishing this option, call 1-800-525-3713.
 
               SYSTEMATIC EXCHANGE
               With a Systematic Exchange you determine the amount of money
               ($100 minimum) you would like automatically exchanged from one
               Janus account to another on any day of the month. For more
               information on how to establish this option, call 1-800-525-3713.
 
HOW TO EXCHANGE SHARES
 
               On any business day, you may exchange all or a portion of your
               shares into any other available Janus fund.
 
               IN WRITING
 
               To request an exchange in writing, please follow the instructions
               for written requests on page 25.
 
               BY TELEPHONE
 
               All accounts are automatically eligible for the telephone
               exchange option. To exchange shares by telephone, call an
               Investor Service Representative at 1-800-525-3713 during normal
               business hours
 
                                                        Shareholder's manual  21
<PAGE> 
 
               or call the Janus XpressLine, 1-888-979-7737, for access to this
               option 24 hours a day.
 
               BY SYSTEMATIC EXCHANGE
 
               As noted above, you may establish a Systematic Exchange for as
               little as $100 per month on established accounts. You may
               establish a new account with a $500 initial purchase and
               subsequent $100 systematic exchanges. If the balance in the
               account you are exchanging from falls below the systematic
               exchange amount, all remaining shares will be exchanged and the
               program will be discontinued.
 
               BY INTERNET
 
               Exchanges may also be made on our Web site at janus.com.
 
               EXCHANGE POLICIES
 
               - Except for Systematic Exchanges, new accounts established by
                 exchange must be opened with $2,500 or the total account value
                 if the value of the account you are exchanging from is less
                 than $2,500.
 
               - Exchanges between existing accounts must meet the $100
                 subsequent investment requirement.
 
               - You may make four exchanges out of the Fund during a calendar
                 year (exclusive of Systematic Exchanges). Exchanges in excess
                 of this limit may be subject to an exchange fee or may result
                 in termination of the exchange privilege.
 
               - The Fund reserves the right to reject any exchange request and
                 to modify or terminate the exchange privilege at any time. For
                 example, the Fund may reject exchanges from accounts engaged in
                 or known to engage in trading in excess of the limit above
                 (including market timing transactions).
 
               - Exchanges between accounts will be accepted only if the
                 registrations are identical.
 
 22 Janus Venture Fund
<PAGE> 
 
               - If the shares you are exchanging are held in certificate form,
                 you must return the certificate to the Fund prior to making any
                 exchanges.
 
               - Be sure to read the prospectus for the fund into which you are
                 exchanging.
 
               - An exchange represents the sale of shares from one fund and the
                 purchase of shares of another fund, which may produce a taxable
                 gain or loss in a non-tax deferred account.
 
HOW TO REDEEM SHARES
 
               On any business day, you may redeem all or a portion of your
               shares. REMEMBER THAT THE FUND IS CLOSED TO NEW INVESTORS AND IF
               A TOTAL REDEMPTION IS MADE ADDITIONAL INVESTMENTS IN YOUR FUND
               ACCOUNT MIGHT NOT BE POSSIBLE.
 
   
               If the shares are held in certificate form, the certificate must
               be returned with or before your redemption request. Your
               transaction will be processed at the next NAV calculated after
               your order is received and accepted. The redemption may be
               suspended for 10 days following an address change unless a
               signature guarantee is provided.
    
 
               IN WRITING
 
               To request a redemption in writing, please follow the
               instructions for written requests noted on page 25.
 
               BY TELEPHONE
 
               Most accounts have the telephone redemption option, unless this
               option was specifically declined on the application or in
               writing. This option enables you to request redemptions daily
               from your account by calling 1-800-525-3713 by the close of the
               regular trading session of the New York Stock Exchange ("NYSE")
               normally 4:00 p.m. New York time. You may also use Janus
               XpressLine, 1-888-979-7737, for access to this option 24 hours a
               day. (There is a daily limit of $100,000 per account for
               redemptions payable by check.)
 
                                                        Shareholder's manual  23
<PAGE> 
 
               BY INTERNET
 
               Redemptions may also be made on our Web site at janus.com.
 
               SYSTEMATIC REDEMPTION OPTION
 
               The Systematic Redemption Option allows you to redeem a specific
               dollar amount from your Fund account on a regular basis. For more
               information or to request the appropriate form, please call
               1-800-525-3713.
 
PAYMENT OF REDEMPTION PROCEEDS
 
               BY CHECK
               Redemption proceeds will be sent to the shareholder(s) of record
               at the address of record within seven days after receipt of a
               valid redemption request.
 
               BY ELECTRONIC TRANSFER
               If you have established the electronic redemption option, your
               redemption proceeds can be electronically transferred to your
               predesignated bank account on the next bank business day after
               receipt of your redemption request (wire transfer) or the second
               bank business day after receipt of your redemption request (ACH
               transfer). Wire transfers will be charged an $8 fee per wire and
               your bank may charge an additional fee to receive the wire. ACH
               transfers are made free of charge. Wire redemptions are not
               available for retirement accounts.
 
               If you would like to establish the electronic redemption option
               on an existing account, please call 1-800-525-3713 to request the
               appropriate form.
 
               IF THE SHARES BEING REDEEMED WERE PURCHASED BY CHECK, TELEPHONE,
               ON OUR WEB SITE, OR THROUGH THE AUTOMATIC MONTHLY INVESTMENT
               PROGRAM, THE FUND MAY DELAY THE PAYMENT OF YOUR REDEMPTION
               PROCEEDS FOR UP TO 15 DAYS FROM THE DAY OF PURCHASE TO ALLOW THE
               PURCHASE TO CLEAR. Unless you provide alternate instructions,
               your proceeds will be invested in
 
 24 Janus Venture Fund
<PAGE> 
 
               Janus Money Market Fund - Investor Shares during the 15 day hold
               period.
 
WRITTEN INSTRUCTIONS
 
               To redeem all or part of your shares in writing, your request
               should be sent to one of the addresses listed on page 14 and must
               include the following information:
 
               - the name of the Fund
 
               - the account number
 
               - the amount of money or number of shares being redeemed or
                 exchanged
 
               - the name(s) on the account registration
 
               - the signature(s) of all registered account owners
 
               - your daytime telephone number
 
               SIGNATURE REQUIREMENTS BASED ON ACCOUNT TYPE
 
               INDIVIDUAL, JOINT TENANTS, TENANTS IN COMMON
               Written instructions must be signed by each shareholder, exactly
               as the names appear in the account registration.
 
               UGMA OR UTMA
               Written instructions must be signed by the custodian in his/her
               capacity as it appears in the account registration.
 
               SOLE PROPRIETOR, GENERAL PARTNER
               Written instructions must be signed by an authorized individual
               in his/her capacity as it appears on the account registration.
 
               CORPORATION, ASSOCIATION
               Written instructions must be signed by the person(s) authorized
               to act on the account. In addition, a certified copy of the
               corporate resolution authorizing the signer to act must accompany
               the request.
 
                                                        Shareholder's manual  25
<PAGE> 
 
               TRUST
               Written instructions must be signed by the trustee(s). If the
               name(s) of the current trustee(s) does not appear in the account
               registration, a certificate of incumbency dated within 60 days
               must also be submitted.
 
               IRA
               Written instructions must be signed by the account owner. If you
               do not want federal income tax withheld from your redemption, you
               must state that you elect not to have such withholding apply. In
               addition, your instructions must state whether the distribution
               is normal (after age 59 1/2) or premature (before age 59 1/2)
               and, if premature, whether any exceptions such as death or
               disability apply with regard to the 10% additional tax on early
               distributions.
 
SIGNATURE GUARANTEE
 
               In addition to the signature requirements, A SIGNATURE GUARANTEE
               IS ALSO REQUIRED if any of the following is applicable:
 
               - You request a redemption by check that exceeds $100,000.
 
               - You would like the check made payable to anyone other than the
                 shareholder(s) of record.
 
               - You would like the check mailed to an address which has been
                 changed within 10 days of the redemption request.
 
               - You would like the check mailed to an address other than the
                 address of record.
 
   
               THE FUND RESERVES THE RIGHT TO REQUIRE A SIGNATURE GUARANTEE
               UNDER OTHER CIRCUMSTANCES OR TO REJECT OR DELAY A REDEMPTION ON
               CERTAIN LEGAL GROUNDS. FOR MORE INFORMATION PERTAINING TO
               SIGNATURE GUARANTEES, PLEASE CALL 1-800-525-3713.
    
 
               HOW TO OBTAIN A SIGNATURE GUARANTEE
 
               A signature guarantee assures that a signature is genuine. The
               signature guarantee protects shareholders from unauthorized
               account transfers. The following financial institutions may
               guaran-
 
 26 Janus Venture Fund
<PAGE> 
 
               tee signatures: banks, savings and loan associations, trust
               companies, credit unions, broker-dealers, and member firms of a
               national securities exchange. Call your financial institution to
               see if they have the ability to guarantee a signature. A
               signature guarantee cannot be provided by a notary public.
 
               If you live outside the United States, a foreign bank properly
               authorized to do business in your country of residence or a U.S.
               consulate may be able to authenticate your signature.
 
PRICING OF FUND SHARES
 
               All purchases, redemptions and exchanges will be processed at the
               NAV next calculated after your request is received and accepted
               by the Fund (or the Fund's agent or authorized designee). The
               Fund's NAV is calculated at the close of the regular trading
               session of the NYSE (normally 4:00 p.m. New York time) each day
               that the NYSE is open. The NAV of Fund shares is not determined
               on days the NYSE is closed (generally, New Year's Day, Martin
               Luther King Day, Presidents' Day, Good Friday, Memorial Day,
               Independence Day, Labor Day, Thanksgiving and Christmas). In
               order to receive a day's price, your order must be received by
               the close of the regular trading session of the NYSE. Securities
               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.
 
SHAREHOLDER SERVICES AND ACCOUNT POLICIES
 
               JANUS XPRESSLINE(TM)
 
               Janus XpressLine, our electronic telephone service, offers you
               24-hour access by TouchTone(TM) telephone to obtain information
               on account balances, Fund performance or dividends. You can also
               make exchanges, purchases and redemptions in existing accounts,
               request literature about any Janus fund, or order duplicate
 
                                                        Shareholder's manual  27
<PAGE> 
 
               statements. Janus XpressLine is accessed by calling
               1-888-979-7737. Calls are limited to five minutes.
 
               JANUS WEB SITE
 
               Janus maintains a Web site located at JANUS.COM. You can
               purchase, exchange and redeem shares and access information such
               as your account balance and the Fund's NAV through the Web site.
               In order to engage in transactions on our Web site, you must
               authorize us to transmit account information online and accept
               online instructions (see janus.com and follow the procedures
               accordingly). You may also need to have bank account information,
               wire instructions or other options established on your account.
               The Fund and its agents will not be responsible for any losses
               resulting from unauthorized transactions on our Web site when
               procedures designed for engaging in such transactions are
               followed. If you have questions, please call 1-800-975-9932 to
               speak to a Janus representative.
 
               ACCOUNT MINIMUMS
 
               Due to the proportionately higher costs of maintaining small
               accounts, Janus reserves the right to deduct a $10 minimum
               balance fee (or the value of the account if less than $10) from
               accounts with values below the minimums described on page 16 or
               to close such accounts. This policy will apply to accounts
               participating in the Automatic Monthly Investment Program only if
               your account balance does not reach the required minimum initial
               investment or falls below such minimum and you have discontinued
               monthly investments. This policy does not apply to accounts that
               fall below the minimums solely as a result of market value
               fluctuations. It is expected that, for purposes of this policy,
               accounts will be valued in September, and the $10 fee will be
               assessed on the second Friday of September of each year. You will
               receive notice before we charge the $10 fee or close your account
               so that you may increase your account balance to the required
               minimum.
 
 28 Janus Venture Fund
<PAGE> 
 
               TRANSACTIONS THROUGH PROCESSING ORGANIZATIONS
 
               You may purchase or sell Fund shares through a broker-dealer,
               bank or other financial institution, or an organization that
               provides recordkeeping and consulting services to 401(k) plans or
               other employee benefit plans (a "Processing Organization").
               Processing Organizations may charge you a fee for this service
               and may require different minimum initial and subsequent
               investments than the Fund. Processing Organizations may also
               impose other charges or restrictions different from those
               applicable to shareholders who invest in the Fund directly. A
               Processing Organization, rather than its customer, may be the
               shareholder of record of your shares. The Fund is not responsible
               for the failure of any Processing Organization to carry out its
               obligations to its customers. Certain Processing Organizations
               may receive compensation from Janus Capital or its affiliates and
               certain Processing Organizations may receive compensation from
               the Fund for shareholder recordkeeping and similar services.
 
               TAXPAYER IDENTIFICATION NUMBER
 
               On your application or other appropriate form, you will be asked
               to certify that your Social Security or taxpayer identification
               number is correct and that you are not subject to backup
               withholding for failing to report income to the IRS. If you are
               subject to the 31% backup withholding or you did not certify your
               taxpayer identification number, the IRS requires the Fund to
               withhold 31% of any dividends paid and redemption or exchange
               proceeds. In addition to the 31% backup withholding, you may be
               subject to a $50 fee to reimburse the Fund for any penalty that
               the IRS may impose.
 
               SHARE CERTIFICATES
 
   
               Most shareholders choose not to hold their shares in certificate
               form because account transactions such as exchanges and
               redemptions cannot be completed until the certificate has been
               returned to the Fund. The Fund will issue share certificates upon
               written request only and reserves the right to charge a fee for
               this service.
    
 
                                                        Shareholder's manual  29
<PAGE> 
 
               Share certificates will not be issued until the shares have been
               held for at least 15 days and will not be issued for accounts
               that do not meet the minimum investment requirements. Share
               certificates cannot be issued for retirement accounts. In
               addition, if the certificate is lost, there may be a replacement
               charge.
 
               INVOLUNTARY REDEMPTIONS
 
               The Fund reserves the right to close an account if the
               shareholder is deemed to engage in activities which are illegal
               or otherwise believed to be detrimental to the Fund.
 
               TELEPHONE TRANSACTIONS
 
               You may initiate many transactions by telephone. The Fund and its
               agents will not be responsible for any losses resulting from
               unauthorized transactions when procedures designed to verify the
               identity of the caller are followed.
 
               It may be difficult to reach an Investor Service Representative
               by telephone during periods of unusual market activity. If you
               are unable to reach a representative by telephone, please
               consider sending written instructions, stopping by a Service
               Center, calling the Janus XpressLine or visiting our Web site.
 
               TEMPORARY SUSPENSION OF SERVICES
 
               The Fund or its agents may, in case of emergency, temporarily
               suspend telephone transactions or other shareholder services.
 
               ADDRESS CHANGES
 
               To change the address on your account, call 1-800-525-3713 or
               send a written request signed by all account owners. Include the
               name of the Fund, the account number(s), the name(s) on the
               account and both the old and new addresses. Certain options may
               be suspended for 10 days following an address change unless a
               signature guarantee is provided.
 
 30 Janus Venture Fund
<PAGE> 
 
               REGISTRATION CHANGES
 
               To change the name on an account, the shares are generally
               transferred to a new account. In some cases, legal documentation
               may be required. For more information call 1-800-525-3713.
 
               STATEMENTS AND REPORTS
 
   
               Investors participating in an automatic investment program will
               receive quarterly confirmations of all transactions. Dividend
               information will be distributed annually. In addition, the Fund
               will send you an immediate transaction confirmation statement
               after every non-systematic transaction.
    
 
   
               The Fund produces financial reports, which include a list of the
               Fund's portfolio holdings, semiannually and updates its
               prospectus annually. To reduce expenses, the Fund may choose to
               mail only one report or prospectus to your household, even if
               more than one person in the household has a Fund account. Please
               call 1-800-525-3713 if you would like to receive additional
               reports or prospectuses. The Fund reserves the right to charge a
               fee for additional statement and report requests.
    
 
                                                        Shareholder's manual  31
<PAGE> 
Management of the fund
 
INVESTMENT ADVISER
 
               Janus Capital Corporation, 100 Fillmore Street, Denver, Colorado
               80206-4928, is the investment adviser to the Fund and is
               responsible for the day-to-day management of its investment
               portfolio and other business affairs.
 
               Janus Capital began serving as investment adviser to Janus Fund
               in 1970 and currently serves as investment adviser to all of the
               Janus 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 the Fund's investments. Janus Capital also furnishes
               certain administrative, compliance and accounting services for
               the Fund, and may be reimbursed by the Fund 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 Fund and pays the salaries, fees and expenses of
               all Fund officers and those Trustees who are affiliated with
               Janus Capital.
 
               The Fund pays Janus Capital a management fee which is calculated
               daily and paid monthly. The advisory agreement with the Fund
               spells out the management fee and other expenses that the Fund
               must pay.
 
               The Fund incurs expenses not assumed by Janus Capital, including
               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. The Annual Fund Operating Expenses
               table on page 4 lists the actual management fee and total
               operating expenses of the Fund for the most recent fiscal year.
 
 32 Janus Venture Fund
<PAGE> 
 
PORTFOLIO MANAGERS
 
   
               The Fund is managed by a management team consisting of James P.
               Craig, William H. Bales and Jonathan D. Coleman, each of whom
               also serves as Executive Vice President of the Fund. The
               management team began managing the Fund on February 1, 1997. The
               portfolio managers' other primary responsibilities and education
               are set forth below.
    
 
JAMES P. CRAIG, III
- --------------------------------------------------------------------------------
                   is Chief Investment Officer of Janus Capital. He is
                   Executive Vice President and portfolio manager of Janus
                   Fund, which he has managed since 1986. Mr. Craig
                   previously managed Janus Balanced Fund from December 1993
                   to December 1995. He holds a Bachelor of Arts in Business
                   from the University of Alabama and a Master of Arts in
                   Finance from the Wharton School of the University of
                   Pennsylvania.
 
WILLIAM H. BALES
- --------------------------------------------------------------------------------
                   has been a research analyst with Janus Capital since 1993,
                   focusing primarily on the transportation, consumer
                   products and restaurant industries. He joined Janus
                   Capital in September 1991. Mr. Bales holds a Bachelor of
                   Science in Marketing and a Master of Science in Marketing
                   and Finance from the University of Colorado. He is seeking
                   the Chartered Financial Analyst designation.
 
JONATHAN D. COLEMAN
- --------------------------------------------------------------------------------
                   has been a research analyst with Janus Capital since July
                   1994, focusing primarily on the railroad, computer,
                   healthcare and financial services industries. Prior to
                   joining Janus Capital, Mr. Coleman was a Fulbright Fellow
                   from August 1993 until June 1994. He holds a Bachelor of
                   Arts in Political Economy and Spanish from Williams
                   College and received the Chartered Financial Analyst
                   designation.
 
                                                      Management of the fund  33
<PAGE> 
Other information
 
               SIZE OF THE FUND
 
               The Fund has discontinued sales of its shares because its
               management and the Trustees believe that a substantial increase
               in size may adversely affect the Fund's ability to achieve its
               investment objective by reducing its flexibility in making
               investments and in effecting portfolio changes. Although sales to
               new investors have been discontinued, existing shareholders are
               permitted to continue to purchase shares and to reinvest any
               dividends or capital gains distributions. See the Shareholder's
               Manual beginning on page 14.
 
               YEAR 2000
 
               Preparing for Year 2000 is a high priority for Janus Capital,
               which has established a dedicated group to address this issue.
               Janus Capital has devoted considerable internal resources and has
               engaged one of the foremost experts in the field to help achieve
               Year 2000 readiness. Janus Capital does not anticipate that Year
               2000-related issues will have a material impact on its ability to
               continue to provide the Fund with service at current levels;
               however, Janus Capital cannot make any assurances that the steps
               it has taken to ensure Year 2000 readiness will be successful. In
               addition, there can be no assurance that Year 2000 issues will
               not affect the companies in which the Fund invests or worldwide
               markets and economies.
 
 34 Janus Venture Fund
<PAGE> 
                           Distributions and taxes
 
DISTRIBUTIONS
 
   
               To avoid taxation of the Fund, the Internal Revenue Code requires
               the Fund to distribute net income and any net capital gains
               realized on its investments annually. The Fund'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. Dividends and capital gains distributions are
               normally declared and paid in December.
    
 
               HOW DISTRIBUTIONS AFFECT THE FUND'S NAV
 
               Distributions are paid to shareholders as of the record date of
               the distribution of the Fund, regardless of how long the shares
               have been held. Dividends and capital gains awaiting distribution
               are included in the Fund's daily NAV. The share price of the Fund
               drops by the amount of the distribution, net of any subsequent
               market fluctuations. As an example, assume that on December 31,
               the Fund declared a dividend in the amount of $0.25 per share. If
               the Fund's share price was $10.00 on December 30, the Fund's
               share price on December 31 would be $9.75, barring market
               fluctuations. Shareholders should be aware that distributions
               from a taxable mutual fund are not value-enhancing and may create
               income tax obligations.
 
               "BUYING A DIVIDEND"
 
               If you purchase shares of the Fund just before the distribution,
               you will pay the full price for the shares and receive a portion
               of the purchase price back as a taxable distribution. This is
               referred to as "buying a dividend." In the above example, if you
               bought shares on December 30, you would have paid $10.00 per
               share. On December 31, the Fund would pay you $0.25 per share as
               a dividend and your shares would now be worth $9.75 per share.
               Unless your account is set up as a tax-deferred account,
               dividends paid to you would be included in your gross income for
               tax purposes, even though you may not have participated in the
 
                                                     Distributions and taxes  35
<PAGE> 
 
               increase in NAV of the Fund, whether or not you reinvested the
               dividends.
 
DISTRIBUTION OPTIONS
 
               When you open an account, you must specify on your application
               how you want to receive your distributions. You may change your
               distribution option at any time by writing the Fund at one of the
               addresses on page 14 or calling 1-800-525-3713. The Fund offers
               the following options:
 
               1. REINVESTMENT OPTION. You may reinvest your income dividends
                  and capital gains distributions in additional shares. This
                  option is assigned automatically if no other choice is made.
 
               2. CASH OPTION. You may receive your income dividends and capital
                  gains distributions in cash.
 
               3. REINVEST AND CASH OPTION. You may receive either your income
                  dividends or capital gains distributions in cash and reinvest
                  the other in additional shares.
 
               4. REDIRECT OPTION. You may direct your dividends or capital
                  gains to purchase shares of another Janus fund.
 
               The Fund reserves the right to reinvest into your account
               undeliverable and uncashed dividend and distribution checks that
               remain outstanding for six months in shares of the Fund at the
               NAV next computed after the check is cancelled. Subsequent
               distributions may also be reinvested.
 
TAXES
 
   
               As with any investment, you should consider the tax consequences
               of investing in the Fund. Any time you sell or exchange shares of
               a Fund in a taxable account, it is considered a taxable event.
               Depending on the purchase price and the sale price, you may have
               a gain or loss on the transaction. Any tax liabilities generated
               by your transactions are your responsibility.
    
 
               The following discussion does not apply to tax-deferred accounts,
               nor is it a complete analysis of the federal tax implications of
               investing in the Fund. You may wish to consult your own tax
 
 36 Janus Venture Fund
<PAGE> 
 
               adviser. Additionally, state or local taxes may apply to your
               investment, depending upon the laws of your state of residence.
 
               TAXES ON DISTRIBUTIONS
 
               Dividends and distributions by the Fund are subject to federal
               income tax, regardless of whether the distribution is made in
               cash or reinvested in additional shares of the Fund.
               Distributions may be taxable at different rates depending on the
               length of time the Fund holds a security. In certain states, a
               portion of the dividends and distributions (depending on the
               source of the Fund's income) may be exempt from state and local
               taxes. Information regarding the tax status of income dividends
               and capital gains distributions will be mailed to shareholders on
               or before January 31st of each year. Account tax information will
               also be sent to the IRS.
 
               TAXATION OF THE FUND
 
               Dividends, interest, and some capital gains received by the Fund
               on foreign securities may be subject to tax withholding or other
               foreign taxes. The Fund 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 an election is not made, any foreign taxes paid or accrued
               will represent an expense to the Fund.
 
               The Fund does not expect to pay federal income or excise taxes
               because it intends to meet certain requirements of the Internal
               Revenue Code. It is important that the Fund meet these
               requirements so that any earnings on your investment will not be
               taxed twice.
 
                                                     Distributions and taxes  37
<PAGE> 
Financial highlights
 
   
               The financial highlights table is intended to help you understand
               the Fund's financial performance for the past 5 years through
               October 31st of each fiscal year shown. Items 1 through 9 reflect
               financial results for a single Fund share. The total returns in
               the table represent the rate that an investor would have earned
               (or lost) on an investment in the Fund (assuming reinvestment of
               all dividends and distributions). This information has been
               audited by PricewaterhouseCoopers LLP, whose report, along with
               the Fund's financial statements, are included in the Annual
               Report, which is available upon request and incorporated by
               reference into the SAI.
    
 
   
JANUS VENTURE FUND
    
 
   
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------
                                                    Periods ending October 31st
                                              1998     1997     1996    1995     1994
<S>                                          <C>      <C>      <C>      <C>     <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD    $58.84   $57.16   $59.53   $52.86  $53.25
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                   (0.09)     0.16       --    0.05     0.11
  3. Net gains or (losses) on securities
     (both realized and unrealized)            0.43     6.80     5.09    9.49     4.40
  4. Total from investment operations          0.34     6.96     5.09    9.54     4.51
     LESS DISTRIBUTIONS:
  5. Dividends (from net investment income)      --       --   (0.01)   (0.03)  (0.53)
  6. Distributions (in excess of net
     investment income)                      (0.07)       --       --      --       --
  7. Distributions (from capital gains)      (9.30)   (5.28)   (7.45)   (2.84)  (4.37)
  8. Total distributions                     (9.37)   (5.28)   (7.46)   (2.87)  (4.90)
  9. NET ASSET VALUE, END OF PERIOD          $49.81   $58.84   $57.16   $59.53  $52.86
 10. Total return                             1.07%   13.38%    9.28%   19.24%   9.23%
 11. Net assets, end of period (in
     millions)                               $1,036   $1,252   $1,741   $1,753  $1,550
 12. Average net assets for the period (in
     millions)                               $1,174   $1,379   $1,823   $1,613  $1,563
 13. Ratio of gross expenses to average net
     assets                                   0.94%    0.94%    0.89%   0.92%      N/A
 14. Ratio of net expenses to average net
     assets                                   0.93%    0.92%    0.88%   0.91%    0.96%
 15. Ratio of net investment income/(loss)
     to average net assets                   (0.29%)   0.11%   (0.33%)  0.29%    0.27%
 16. Portfolio turnover rate                    90%     146%     136%    113%     114%
- --------------------------------------------------------------------------------------
</TABLE>
    
 
 38 Janus Venture Fund
<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 Fund may invest. The Fund may
invest in these instruments to the extent permitted by its investment objective
and policies. The Fund is 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
               Fund 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 stocks 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 equity 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.
 
                                                Glossary of investment terms  39
<PAGE> 
 
               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 SECURITIES are securities 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 securities 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, the portfolio managers 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
 
 40 Janus Venture Fund
<PAGE> 
 
               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 Fund
               must pay if these investments are profitable, the Fund may make
               various elections permitted by the tax laws. These elections
               could require that the Fund recognize taxable income, which in
               turn must be distributed, before the securities are sold and
               before cash is received to pay the distributions.
 
               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 the
               Fund and a simultaneous agreement by the seller (generally a bank
               or dealer) to repurchase the security from the Fund 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, the Fund 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
               the Fund to another party (generally a bank or dealer) in return
               for cash and an agreement by the Fund to buy the security back at
               a specified price and time. This technique will be used primarily
               to provide cash to satisfy unusually heavy redemption requests,
               or for other temporary or emergency purposes.
 
               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
 
                                                Glossary of investment terms  41
<PAGE> 
 
               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.
 
               WARRANTS are securities, typically issued with preferred stocks
               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
               Fund does not earn interest on such securities until settlement
               and bears 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.
 
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
               Fund 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. It may also enter into forward contracts to purchase
               or sell securities or other financial indices.
 
 42 Janus Venture Fund
<PAGE> 
 
               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 Fund 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 Fund
               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 instrument and may be more volatile
               than the underlying instrument. The Fund bears the market risk of
               an investment in the underlying instrument, as well as the credit
               risk of the issuer.
 
               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 Fund may purchase and
               write put and call options on securities, securities indices and
               foreign currencies.
 
                                                Glossary of investment terms  43
<PAGE> 
 
                       This page intentionally left blank
 
 44
<PAGE> 
 
                       This page intentionally left blank
<PAGE> 
 
[JANUS LOGO]
          1-800-525-3713
          P.O. Box 173375
          Denver, Colorado 80217-3375
          janus.com
 
   
You can request other information, including a Statement of
Additional Information, Annual Report or Semiannual Report, free of
charge, by contacting Janus at 1-800-525-3713 or visiting our Web
site at janus.com. In the Fund's Annual Report, you will find a
discussion of the market conditions and investment strategies that
significantly affected the Fund's performance during its last fiscal
year. Other information is also available from financial
intermediaries that sell shares of the Fund.
    
 
The Statement of Additional Information provides detailed
information about the Fund and is incorporated into this Prospectus
by reference. You may review the Fund's Statement of Additional
Information at the Public Reference Room of the SEC or get text only
copies for a fee, by writing to or calling the Public Reference
Room, Washington, D.C. 20549-6009 (1-800-SEC-0330). You may obtain
the Statement of Additional Information for free from the SEC's Web
site at http://www.sec.gov.
 
              Investment Company Act File No. 811-1879
 
  3167
<PAGE>
                                                                    [JANUS LOGO]
 
                         Janus Overseas Fund
 
                                       PROSPECTUS
 
                                       FEBRUARY 17, 1999
 
                         THE FUND HAS DISCONTINUED PUBLIC SALE OF ITS SHARES TO
                         NEW INVESTORS, BUT SHAREHOLDERS WHO HAVE OPEN FUND
                         ACCOUNTS MAY MAKE ADDITIONAL INVESTMENTS AND REINVEST
                         DIVIDENDS AND CAPITAL GAINS DISTRIBUTIONS. CURRENT
                         SHAREHOLDERS MAY ALSO OPEN ADDITIONAL FUND ACCOUNTS
                         UNDER CERTAIN CONDITIONS. IF A FUND ACCOUNT IS CLOSED,
                         HOWEVER, ADDITIONAL INVESTMENTS IN THE FUND MAY NOT BE
                         POSSIBLE.
 
                         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]
 
    
<PAGE> 
 
                                                                           
                                                             Table of contents
 
<TABLE>
                <S>                                               <C>
                RISK/RETURN SUMMARY
                   Janus Overseas Fund..........................    2
                   Fees and expenses............................    4
                INVESTMENT OBJECTIVES, PRINCIPAL INVESTMENT
                STRATEGIES AND RISKS
                   Investment objectives and principal
                   investment strategies........................    5
                   Risks........................................    8
                SHAREHOLDER'S MANUAL
                   Minimum investments..........................   16
                   Types of account ownership...................   16
                   How to open your Janus account...............   18
                   How to purchase shares.......................   19
                   How to exchange shares.......................   21
                   How to redeem shares.........................   23
                   Shareholder services and account policies....   28
                MANAGEMENT OF THE FUND
                   Investment adviser...........................   32
                   Portfolio managers...........................   33
                OTHER INFORMATION............... ...............   34
                DISTRIBUTIONS AND TAXES
                   Distributions................................   35
                   Taxes........................................   36
                FINANCIAL HIGHLIGHTS.............. .............   38
                GLOSSARY
                   Glossary of investment terms.................   39
 
</TABLE>
 
                                                            Table of contents  1
<PAGE> 
Risk return summary
 
JANUS OVERSEAS FUND
 
1. WHAT IS THE INVESTMENT OBJECTIVE OF JANUS OVERSEAS FUND?
 
               The Fund seeks long-term growth of capital.
 
               The Fund's Trustees may change this objective without a
               shareholder vote and the Fund will notify you of any changes that
               are material. If there is a material change in the Fund's
               objective or policies, you should consider whether the Fund
               remains an appropriate investment for you. There is no guarantee
               that the Fund will meet its objective.
 
2. WHAT ARE THE MAIN INVESTMENT STRATEGIES OF JANUS OVERSEAS FUND?
 
               The Fund 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 Fund 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.
 
               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 the portfolio
               managers are unable to find investments with earnings growth
               potential, a significant portion of the Fund's assets may be in
               cash or similar investments.
 
3. WHAT ARE THE MAIN RISKS OF INVESTING IN JANUS OVERSEAS FUND?
 
               The biggest risk of investing in this Fund is that its returns
               may vary and you could lose money. If you are considering
               investing in the Fund, remember that it is designed for long-term
               investors who can accept the risks of investing in a portfolio
               with significant foreign common stock holdings. Common stocks
               tend to be more volatile than other investment choices.
 
               The value of the Fund's portfolio may decrease if the value of an
               individual company in the portfolio decreases. The value of the
               Fund's portfolio could also decrease if the stock market goes
               down. If the value of the Fund's portfolio decreases, the Fund's
               net asset value (NAV) will also decrease which means if you sell
 
 2 Janus Overseas Fund
<PAGE> 
 
               your shares in the Fund you would get back less money. Because
               the Fund has significant exposure to foreign markets and may
               invest without limit in foreign securities, its 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.
 
               An investment in the Fund is not a bank deposit and is not
               insured or guaranteed by the Federal Deposit Insurance
               Corporation or any other government agency.
 
               The following information illustrates how the Fund's performance
               has varied over time. The bar chart depicts the change in the
               Fund's performance from year-to-year during the periods
               indicated. The table compares the Fund's average annual returns
               for the periods indicated to a broad-based securities market
               index.
 
   
               JANUS OVERSEAS FUND
    
 
A BAR CHART showing Annual Total Returns for Janus Overseas Fund from 1995 
through 1998:
   
               Annual returns for periods ended 12/31

                                22.05%   28.83%   18.25%   16.03%
                                 1995     1996     1997     1998

Each percentage is represented by a bar of proportionate size with the actual
total return printed above the bar.

               Best Quarter: 4th-1998 17.77%;  Worst Quarter: 3rd-1998 (19.58%)

    
 
                          Average annual total return for periods ended 12/31/98
                       ---------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                           Since Inception
                                                                  1 year      (5/2/94)
                <S>                                          <C>  <C>      <C>             <C>
                Janus Overseas Fund                               16.03%       18.03%
                Morgan Stanley Capital International EAFE
                  Index*                                          20.00%        8.11%
                                                             -------------------------
</TABLE>
    
 
               * The Morgan Stanley Capital International EAFE 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.
 
               The Fund's past performance does not necessarily indicate how it
               will perform in the future.
 
                                                          Risk return summary  3
<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 Fund.
 
               ANNUAL FUND OPERATING EXPENSES are paid out of the Fund'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 describes the fees and expenses that you may pay if
               you buy and hold shares of the Fund. It is based upon gross
               expenses (without the effect of expense offset arrangements) for
               the fiscal year ended October 31, 1998.
 
<TABLE>
<CAPTION>
                                                                 Janus Overseas Fund
   <S>                                                           <C>                
   Management Fee                                                   0.66%
   Other Expenses                                                   0.30%
   Total Annual Fund Operating Expenses                             0.96%
</TABLE>
 
- --------------------------------------------------------------------------------
 
  EXAMPLE:
  This example is intended to help you compare the cost of investing in the
  Fund with the cost of investing in other mutual funds. The example
  assumes that you invest $10,000 in the Fund for the time periods
  indicated 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 Fund's 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    5 Years    10 Years
                                             ----------------------------------------
   <S>                                       <C>       <C>        <C>        <C>     
   Janus Overseas Fund                        $98       $306       $531       $1,178
</TABLE>
 
 4 Janus Overseas Fund
<PAGE> 
Investment objective, principal 
           investment strategies 
           and risks
 
               This section takes a closer look at the investment objective of
               the Fund, its principal investment strategies and certain risks
               of investing in the Fund. 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 8-11 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
 
               Janus Overseas Fund seeks long-term growth of capital. Normally,
               the Fund 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
               Fund 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.
 
               The Fund may invest substantially all of its assets in common
               stocks of foreign issuers if its portfolio managers believe 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. Realization of income is not a
               significant consideration when choosing investments for the Fund.
               Income realized on the Fund's investments will be incidental to
               its objective.
 
               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
 
              Investment objective, principal investment strategies and risks  5
<PAGE> 
 
               for economic growth among countries, regions or geographic areas
               may warrant greater consideration in selecting foreign
               securities.
 
GENERAL PORTFOLIO POLICIES
 
               In investing its portfolio assets, the Fund will follow the
               general policies listed below. 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 the
               Fund exceeds a limit as a result of market fluctuations or the
               sale of securities, it will not be required to dispose of any
               securities.
 
               CASH POSITION
   
               When the Fund's portfolio managers believe that market conditions
               are unfavorable for profitable investing, or when they are
               otherwise unable to locate attractive investment opportunities,
               the Fund's cash or similar investments may increase. In other
               words, the Fund does not always stay fully invested in stocks.
               Cash or similar investments generally are a residual - they
               represent the assets that remain after the portfolio managers
               have committed available assets to desirable investment
               opportunities. However, the portfolio managers may also
               temporarily increase the Fund's cash position to protect its
               assets or maintain liquidity. When the Fund'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 Fund
               remained more fully invested in stocks.
    
 
               OTHER TYPES OF INVESTMENTS
               The Fund invests primarily in a portfolio of equity securities,
               which may include preferred stocks, common stocks, warrants and
               securities convertible into common or preferred stocks, but it
               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 securities (less than 35% of the Fund's
                 assets)
    
 
 6 Janus Overseas Fund
<PAGE> 
 
   
               - options, futures, forwards 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
    
 
               ILLIQUID INVESTMENTS
               The Fund 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 the 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 Fund's Trustees,
               certain restricted securities may be deemed liquid, and will not
               be counted toward this 15% limit.
 
               FOREIGN SECURITIES
               The Fund may invest without limit in foreign equity and debt
               securities. The Fund 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
               The Fund may invest in special situations. A special situation
               arises when, in the opinion of the Fund's portfolio managers, 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. The Fund's performance could suffer if the
               anticipated development in a "special situation" investment does
               not occur or does not attract the expected attention.
 
              Investment objective, principal investment strategies and risks  7
<PAGE> 
 
               PORTFOLIO TURNOVER
               The Fund generally intends to purchase securities for long-term
               investment although, to a limited extent, the Fund 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. The Fund 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 the Fund's portfolio
               whenever its portfolio managers believe 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
               the Fund's performance.
 
RISKS
 
               Because the Fund may invest substantially all of its assets in
               common stocks, the main risk is the risk that the value of the
               stocks it holds might decrease in response to the activities of
               an individual company or in response to general market and/or
               economic conditions. If this occurs, the Fund's share price may
               also decrease. The Fund'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 or companies with relatively small market
               capitalizations.
 
 8 Janus Overseas Fund
<PAGE> 
 
The following questions and answers are designed to help you better understand
some of the risks of investing in the Fund.
 
1. HOW COULD THE FUND'S INVESTMENTS IN FOREIGN SECURITIES AFFECT ITS
   PERFORMANCE?
 
               The Fund 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 Fund's performance may depend on
               issues other than the performance of a particular company. These
               issues include:
 
               - CURRENCY RISK. As long as the Fund holds a foreign security,
                 its value will be affected by the value of the local currency
                 relative to the U.S. dollar. When the Fund 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 the Fund's assets
                 from that country.
 
               - 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.
 
              Investment objective, principal investment strategies and risks  9
<PAGE> 
 
               - 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. THE FUND 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.
 
3. I'VE HEARD A LOT ABOUT HOW THE CHANGE TO THE YEAR 2000 COULD AFFECT COMPUTER
   SYSTEMS. DOES THIS CREATE ANY SPECIAL RISKS?
 
               The portfolio managers carefully research each potential
               investment before making an investment decision and, among other
               things, consider Year 2000 readiness when selecting portfolio
               holdings. However, there is no guarantee that the information a
               portfolio manager receives regarding a company's Year 2000
 
 10 Janus Overseas Fund
<PAGE> 
 
               readiness is completely accurate. If a company has not
               satisfactorily addressed Year 2000 issues, the Fund's performance
               could suffer.
 
4. ARE THERE SPECIAL RISKS ASSOCIATED WITH INVESTMENTS IN HIGH-YIELD/HIGH-RISK
   SECURITIES?
 
   
               High-yield/high-risk securities (or "junk" bonds) are securities
               rated below investment grade by the primary rating agencies such
               as Standard & Poor's and Moody's. The value of lower quality
               securities generally is more dependent on credit risk, or the
               ability of the issuer to meet interest and principal payments,
               than investment grade debt securities. Issuers of high-yield
               securities 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.
    
 
               Please refer to the SAI for a description of bond rating
               categories.
 
5. HOW DOES THE FUND TRY TO REDUCE RISK?
 
               The Fund may use futures, options and other derivative
               instruments to "hedge" or protect its portfolio from adverse
               movements in securities prices and interest rates. The Fund may
               also use a variety of currency hedging techniques, including
               forward currency contracts, to manage exchange rate risk. The
               Fund believes the use of these instruments will benefit the Fund.
               However, the Fund's performance could be worse than if the Fund
               had not used such instruments if the portfolio managers'
               judgement proves incorrect. Risks associated with the use of
               derivative instruments are described in the SAI.
 
             Investment objective, principal investment strategies and risks  11
<PAGE> 
 
Janus Overseas Fund
<PAGE> 
 
                   Shareholder's
                   Manual
 
                   This section will help you become
                   familiar with the different types
                   of accounts you can establish with
                   Janus. It also explains in detail
                   the wide array of services and
                   features you can establish on your
                   account, as well as account
                   policies and fees that may apply
                   to your account. Account policies
                   (including fees), services and
                   features may be modified or
                   discontinued without shareholder
                   approval or prior notice.
 
                                                    [JANUS LOGO]
<PAGE> 
 
               Although the Fund has discontinued public sales of its shares to
               new investors, shareholders who maintain open accounts will be
               able to continue to purchase shares and reinvest any dividends
               and capital gains distributions in additional shares. In
               addition, the Fund will continue to accept new accounts which are
               opened under taxpayer identification numbers that are identical
               to those for existing Fund accounts. Once a Fund account is
               closed, it may not be reopened. An account may be considered
               closed and subject to redemption by the Fund in the circumstances
               discussed under "Involuntary Redemptions" on page 30.
 
HOW TO GET IN TOUCH WITH JANUS
 
               Janus offers two Investor Service Centers for those individuals
               who would like to conduct their investing in person. Our
               representatives will be happy to assist you at either of the
               following locations Monday-Friday 7:00 a.m. to 6:00 p.m. Mountain
               time and Saturday 9:00 a.m. to 1:00 p.m. Mountain time.
 
               100 Fillmore Street, Suite 100
               Denver, CO 80206
 
               3773 Cherry Creek North Drive, Suite 101
               Denver, CO 80209
 
 14 Janus Overseas Fund
<PAGE> 
 
 QUICK ADDRESS AND TELEPHONE REFERENCE
- --------------------------------------------------------------------------------
 
<TABLE>
  <S>                                           <C>
  MAILING ADDRESS                               JANUS XPRESSLINE(TM)
  Janus                                         1-888-979-7737
  P.O. Box 173375                               For 24-hour access to account
  Denver, CO 80217-3375                         and fund information,
                                                exchanges, purchases and
  FOR OVERNIGHT CARRIER                         redemptions, automated daily
  Janus                                         quotes on fund share prices,
  Suite 101                                     yields and total returns.
  3773 Cherry Creek North Drive
  Denver, CO 80209-3811                         TDD
                                                1-800-525-0056
  INVESTOR SERVICE REPRESENTATIVES              A telecommunications device
  If you have any questions while reading       for our hearing- and
  this Prospectus, please call one of our       speech-impaired shareholders.
  Investor Service Representatives at
  1-800-525-3713 Monday-Friday: 8:00            JANUS LITERATURE LINE
  a.m.-8:00 p.m., and Saturday: 10:00           1-800-525-8983
  a.m.-4:00 p.m., New York time.                To request a prospectus,
                                                shareholder reports or
  JANUS INTERNET ADDRESS                        marketing materials 24 hours a
  janus.com                                     day.
</TABLE>
 
                                                        Shareholder's manual  15
<PAGE> 
 
MINIMUM INVESTMENTS*
- ---------------------------------------------
 
<TABLE>
<S>                                 <C>
To open a new regular account        $2,500
To open a new retirement,
education or UGMA/UTMA account       $  500
To open a new regular account with
an Automatic Investment Program      $  500**
To add to any type of an account     $  100+
</TABLE>
 
 * The Fund reserves the right to
   change the amount of these
   minimums from time to time or
   to waive them in whole or in
   part for certain types of
   accounts.
** An Automatic Investment Program
   requires a $100 minimum
   automatic investment per month
   until the account balance
   reaches $2,500.
 + The minimum subsequent
   investment for IRA UGMA/UTMA
   accounts is $50.
 
TYPES OF ACCOUNT OWNERSHIP
 
   
               As discussed on page 14, the Fund will accept new accounts opened
               under taxpayer identification numbers identical to those on
               current fund accounts. You can establish the following types of
               accounts by completing a New Account Application. To request an
               application, call 1-800-525-3713.
    
 
               INDIVIDUAL OR JOINT OWNERSHIP
               Individual accounts are owned by one person. Joint accounts have
               two or more owners.
 
               A GIFT OR TRANSFER TO MINOR (UGMA OR UTMA)
               An UGMA/UTMA account is a custodial account managed for the
               benefit of a minor. To open an UGMA or UTMA account, you must
               include the minor's Social Security number on the application.
 
               TRUST
               An established trust can open an account. The names of each
               trustee, the name of the trust and the date of the trust
               agreement must be included on the application.
 
 16 Janus Overseas Fund
<PAGE> 
 
               BUSINESS ACCOUNTS
               Corporations and partnerships may also open an account. The
               application must be signed by an authorized officer of the
               corporation or a general partner of the partnership.
 
TAX-DEFERRED ACCOUNTS
 
   
               If you are eligible, you may set up one or more tax-deferred
               accounts. A tax-deferred account allows you to shelter your
               investment income and capital gains from current income taxes. A
               contribution to certain of these plans may also be tax
               deductible. Tax-deferred accounts include retirement plans
               described below and the Education IRA. Distributions from these
               plans are generally subject to income tax and may be subject to
               an additional tax if withdrawn prior to age 59 1/2 or used for a
               nonqualifying purpose. Investors should consult their tax adviser
               or legal counsel before selecting a tax-deferred account.
    
 
   
               Investors Fiduciary Trust Company serves as custodian for the
               tax-deferred accounts offered by the Fund. You will be charged an
               annual account maintenance fee of $12 for each taxpayer
               identification number no matter how many tax-deferred accounts
               you have with Janus. You may pay the fee by check or have it
               automatically deducted from your account (usually in December).
               The custodian reserves the right to change the amount of this fee
               or to waive it in whole or in part for certain types of accounts.
    
 
               The following plans require a special application. For an
               application and more details about our Retirement Plans, call
               1-800-525-3713.
 
               TRADITIONAL AND ROTH INDIVIDUAL RETIREMENT ACCOUNTS
   
               Both types of IRAs allow most individuals with earned income to
               contribute up to the lesser of $2,000 ($4,000 for most married
               couples) or 100% of compensation annually. Please refer to the
               Janus IRA booklet for more complete information regarding IRAs.
    
 
                                                        Shareholder's manual  17
<PAGE> 
 
               EDUCATION IRA
               This plan allows individuals, subject to certain income
               limitations, to contribute up to $500 annually on behalf of any
               child under the age of 18. Please refer to the Janus IRA booklet
               for more complete information regarding the Education IRA.
 
               SIMPLIFIED EMPLOYEE PENSION PLAN
               This plan allows small business owners (including sole
               proprietors) to make tax-deductible contributions for themselves
               and any eligible employee(s). A SEP requires an IRA (a SEP-IRA)
               to be set up for each SEP participant.
 
               PROFIT SHARING OR MONEY PURCHASE PENSION PLAN
               These plans are open to corporations, partnerships and sole
               proprietors to benefit their employees and themselves.
 
               SECTION 403(B)(7) PLAN
               Employees of educational organizations or other qualifying, tax-
               exempt organizations may be eligible to participate in a Section
               403(b)(7) Plan.
 
HOW TO OPEN YOUR JANUS ACCOUNT
 
   
               If you are a current Fund shareholder and want to open another
               Fund account, complete and sign the appropriate application.
               Please be sure to provide your Social Security or taxpayer
               identification number on the application and make your check
               payable to Janus. The Fund is available only to U.S. citizens or
               residents, and your application will be returned if you do not
               meet these criteria. Send all items to one of the addresses
               listed in the "Quick Address and Telephone Reference" on page 15.
    
 
 18 Janus Overseas Fund
<PAGE> 
 
HOW TO PURCHASE SHARES
 
               PAYING FOR SHARES
 
               When you purchase shares, your request will be processed at the
               next NAV calculated after your order is received and accepted.
               Please note the following:
 
               - Cash, credit cards, third party checks and credit card checks
                 will not be accepted.
 
               - All purchases must be made in U.S. dollars.
 
               - Checks must be drawn on a U.S. bank and made payable to Janus.
 
               - If a check does not clear your bank, the Fund reserves the
                 right to cancel the purchase.
 
               - If the Fund is unable to debit your predesignated bank account
                 on the day of purchase, it may make additional attempts or
                 cancel the purchase.
 
               - The Fund reserves the right to reject any specific purchase
                 request.
 
               If your purchase is cancelled, you will be responsible for any
               losses or fees imposed by your bank and losses that may be
               incurred as a result of any decline in the value of the cancelled
               purchase. The Fund (or its agents) has the authority to redeem
               shares in your account(s) to cover any such losses due to
               fluctuations in share price. Any profit on such cancellation will
               accrue to the Fund.
 
               ONCE YOU HAVE OPENED YOUR JANUS ACCOUNT, THE MINIMUM AMOUNT FOR
               AN ADDITIONAL INVESTMENT IS $100 ($50 FOR IRAS OR UGMA/UTMA
               ACCOUNTS). You may add to your account at any time through any of
               the following options:
 
               BY MAIL
 
               Complete the remittance slip attached at the bottom of your
               confirmation statement. If you are making a purchase into a
 
                                                        Shareholder's manual  19
<PAGE> 
 
               retirement account, please indicate whether the purchase is a
               rollover or a current or prior year contribution. Send your check
               made payable to Janus and remittance slip or written instructions
               to one of the addresses listed previously. You may also request a
               booklet of remittance slips for non-retirement accounts.
 
               BY TELEPHONE
 
               This service allows you to purchase additional shares quickly and
               conveniently through an electronic transfer of money. To purchase
               shares by telephone, call an Investor Service Representative at
               1-800-525-3713 during normal business hours or call the Janus
               XpressLine, 1-888-979-7737, for access to this option 24 hours a
               day. When you make an additional purchase by telephone, Janus
               will automatically debit your predesignated bank account for the
               desired amount. To establish the telephone purchase option on
               your new account, complete the "Telephone Purchase of Shares
               Option" section on the application and attach a "voided" check or
               deposit slip from your bank account. If your account is already
               established, call 1-800-525-3713 to request the appropriate form.
               This option will become effective ten days after the form is
               received.
 
               BY WIRE
 
               Purchases may also be made by wiring money from your bank account
               to your Janus account. Call 1-800-525-3713 to receive wiring
               instructions.
 
               BY INTERNET
 
               You must pre-establish the "Telephone Purchase of Shares Option"
               to make a purchase on our Web site at janus.com. If you have
               questions, please call 1-800-975-9932 to speak to a Janus
               representative.
 
 20 Janus Overseas Fund
<PAGE> 
 
               AUTOMATIC INVESTMENT PROGRAMS
 
               Janus offers several automatic investment programs to help
               investors achieve their financial goals as simply and
               conveniently as possible. You may open a new account with a $500
               initial purchase and $100 automatic subsequent investments.
 
               AUTOMATIC MONTHLY INVESTMENT PROGRAM
               You select the day each month that your money ($100 minimum) will
               be electronically transferred from your bank account to your Fund
               account. To establish this option, complete the "Automatic
               Monthly Investment Program" section on the application and attach
               a "voided" check from your bank account. If your Fund account is
               already established, call 1-800-525-3713 to request the
               appropriate form.
 
               PAYROLL DEDUCTION
               If your employer can initiate an automatic payroll deduction, you
               may have all or a portion of your paycheck ($100 minimum)
               invested directly into your Fund account. To obtain information
               on establishing this option, call 1-800-525-3713.
 
               BY SYSTEMATIC EXCHANGE
               With a Systematic Exchange you determine the amount of money
               ($100 minimum) you would like automatically exchanged from one
               Janus account to another on any day of the month. For more
               information on how to establish this option, call 1-800-525-3713.
 
HOW TO EXCHANGE SHARES
 
               On any business day, you may exchange all or a portion of your
               shares into any other available Janus fund.
 
               IN WRITING
 
               To request an exchange in writing, please follow the instructions
               for written requests on page 25.
 
                                                        Shareholder's manual  21
<PAGE> 
 
               BY TELEPHONE
 
               All accounts are automatically eligible for the telephone
               exchange option. To exchange shares by telephone, call an
               Investor Service Representative at 1-800-525-3713 during normal
               business hours or call the Janus XpressLine, 1-888-979-7737, for
               access to this option 24 hours a day.
 
               BY SYSTEMATIC EXCHANGE
 
               As noted above, you may establish a Systematic Exchange for as
               little as a $100 subsequent purchase per month on established
               accounts. You may establish a new account with a $500 initial
               purchase and subsequent $100 systematic exchanges. If the balance
               in the account you are exchanging from falls below the systematic
               exchange amount, all remaining shares will be exchanged and the
               program will be discontinued.
 
               BY INTERNET
 
               Exchanges may also be made on our Web site at janus.com.
 
               EXCHANGE POLICIES
 
               - Except for Systematic Exchanges, new accounts established by
                 exchange must be opened with $2,500 or the total account value
                 if the value of the account you are exchanging from is less
                 than $2,500.
 
               - Exchanges between existing accounts must meet the $100
                 subsequent investment requirement.
 
               - You may make four exchanges out of the Fund during a calendar
                 year (exclusive of Systematic Exchanges). Exchanges in excess
                 of this limit may be subject to an exchange fee or may result
                 in termination of the exchange privilege.
 
               - The Fund reserves the right to reject any exchange request and
                 to modify or terminate the exchange privilege at any time. For
                 example, the Fund may reject exchanges from accounts engaged
 
 22 Janus Overseas Fund
<PAGE> 
 
                 in or known to engage in trading in excess of the limit above
                 (including market timing transactions).
 
               - Exchanges between accounts will be accepted only if the
                 registrations are identical.
 
               - If the shares you are exchanging are held in certificate form,
                 you must return the certificate to your Fund prior to making
                 any exchanges.
 
               - Be sure that you read the prospectus for the fund into which
                 you are exchanging.
 
               - An exchange represents the sale of shares from one fund and the
                 purchase of shares of another fund, which may produce a taxable
                 gain or loss in a non-tax deferred account.
 
HOW TO REDEEM SHARES
 
               On any business day, you may redeem all or a portion of your
               shares. REMEMBER THAT THE FUND IS CLOSED TO NEW INVESTORS AND IF
               A TOTAL REDEMPTION IS MADE ADDITIONAL INVESTMENTS IN YOUR FUND
               ACCOUNT MIGHT NOT BE POSSIBLE.
 
   
               If the shares are held in certificate form, the certificate must
               be returned with or before your redemption request. Your
               transaction will be processed at the next NAV calculated after
               your order is received and accepted. The redemption may be
               suspended for 10 days following an address change unless a
               signature guarantee is provided.
    
 
               IN WRITING
 
               To request a redemption in writing, please follow the
               instructions for written requests noted on page 25.
 
               BY TELEPHONE
 
               Most accounts have the telephone redemption option, unless this
               option was specifically declined on the application or in
               writing. This option enables you to request redemptions daily
               from your account by calling 1-800-525-3713 by the close of the
               regular
 
                                                        Shareholder's manual  23
<PAGE> 
 
               trading session of the New York Stock Exchange ("NYSE"), normally
               4:00 p.m., New York time. You may also use Janus XpressLine
               1-888-979-7737, for access to this option 24 hours a day. (There
               is a daily limit of $100,000 per account for redemptions payable
               by check).
 
               BY INTERNET
 
               Redemptions may also be made on our Web site at janus.com.
 
               SYSTEMATIC REDEMPTION OPTION
 
               The Systematic Redemption Option allows you to redeem a specific
               dollar amount from your account on a regular basis. For more
               information or to request the appropriate form, please call
               1-800-525-3713.
 
PAYMENT OF REDEMPTION PROCEEDS
 
               BY CHECK
               Redemption proceeds will be sent to the shareholder(s) of record
               at the address of record within seven days after receipt of a
               valid redemption request.
 
               BY ELECTRONIC TRANSFER
               If you have established the electronic redemption option, your
               redemption proceeds can be electronically transferred to your
               predesignated bank account on the next bank business day after
               receipt of your redemption request (wire transfer) or the second
               bank business day after receipt of your redemption request (ACH
               transfer). Wire transfers will be charged an $8 fee per wire and
               your bank may charge an additional fee to receive the wire. ACH
               transfers are made free of charge. Wire redemptions are not
               available for retirement accounts.
 
               If you would like to establish the electronic redemption option
               on an existing account, please call 1-800-525-3713 to request the
               appropriate form.
 
 24 Janus Overseas Fund
<PAGE> 
 
               IF THE SHARES BEING REDEEMED WERE PURCHASED BY CHECK, TELEPHONE
               ON OUR WEB SITE, OR THROUGH THE AUTOMATIC MONTHLY INVESTMENT
               PROGRAM, THE FUND MAY DELAY THE PAYMENT OF YOUR REDEMPTION
               PROCEEDS FOR UP TO 15 DAYS FROM THE DAY OF PURCHASE TO ALLOW THE
               PURCHASE TO CLEAR. Unless you provide alternate instructions,
               your proceeds will be invested in Janus Money Market
               Fund - Investor Shares during the 15 day hold period.
 
WRITTEN INSTRUCTIONS
 
               To redeem or exchange all or part of your shares in writing, your
               request should be sent to one of the addresses listed on page 14
               and must include the following information:
 
               - the name of the Fund
 
               - the account number
 
               - the amount of money or number of shares being redeemed or
                 exchanged
 
               - the name(s) on the account
 
               - the signature(s) of all registered account owners
 
               - your daytime telephone number
 
               SIGNATURE REQUIREMENTS BASED ON ACCOUNT TYPE
 
               INDIVIDUAL, JOINT TENANTS, TENANTS IN COMMON
               Written instructions must be signed by each shareholder, exactly
               as the names appear in the account registration.
 
               UGMA OR UTMA:
               Written instructions must be signed by the custodian in his/her
               capacity as it appears in the account registration.
 
               SOLE PROPRIETOR, GENERAL PARTNER
               Written instructions must be signed by an authorized individual
               in his/her capacity as it appears on the account registration.
 
                                                        Shareholder's manual  25
<PAGE> 
 
               CORPORATION, ASSOCIATION
               Written instructions must be signed by the person(s) authorized
               to act on the account. In addition, a certified copy of the
               corporate resolution authorizing the signer to act must accompany
               the request.
 
               TRUST
               Written instructions must be signed by the trustee(s). If the
               name(s) of the current trustee(s) does not appear in the account
               registration, a certificate of incumbency dated within 60 days
               must also be submitted.
 
               IRA
               Written instructions must be signed by the account owner. If you
               do not want federal income tax withheld from your redemption, you
               must state that you elect not to have such withholding apply. In
               addition, your instructions must state whether the distribution
               is normal (after age 59 1/2) or premature (before age 59 1/2)
               and, if premature, whether any exceptions such as death or
               disability apply with regard to the 10% additional tax on early
               distributions.
 
SIGNATURE GUARANTEE
 
               In addition to the signature requirements, a SIGNATURE GUARANTEE
               IS ALSO REQUIRED if any of the following is applicable:
 
               - You request a redemption by check that exceeds $100,000.
 
               - You would like the check made payable to anyone other than the
                 shareholder(s) of record.
 
               - You would like the check mailed to an address which has been
                 changed within 10 days of the redemption request.
 
               - You would like the check mailed to an address other than the
                 address of record.
 
               THE FUND RESERVES THE RIGHT TO REQUIRE A SIGNATURE GUARANTEE
               UNDER OTHER CIRCUMSTANCES OR TO REJECT OR DELAY A REDEMPTION ON
               CERTAIN LEGAL GROUNDS. FOR MORE INFORMATION PERTAINING TO
               SIGNATURE GUARANTEES, PLEASE CALL 1-800-525-3713.
 
 26 Janus Overseas Fund
<PAGE> 
 
               HOW TO OBTAIN A SIGNATURE GUARANTEE
 
               A signature guarantee assures that a signature is genuine. The
               signature guarantee protects shareholders from unauthorized
               account transfers. The following financial institutions may
               guarantee signatures: banks, savings and loan associations, trust
               companies, credit unions, broker-dealers and member firms of a
               national securities exchange. Call your financial institution to
               see if they have the ability to guarantee a signature. A
               signature guarantee cannot be provided by a notary public.
 
               If you live outside the United States, a foreign bank properly
               authorized to do business in your country of residence or a U.S.
               consulate may be able to authenticate your signature.
 
PRICING OF FUND SHARES
 
               All purchases, redemptions and exchanges will be processed at the
               NAV next calculated after your request is received and accepted
               by the Fund (or the Fund's agent or authorized designee). The
               Fund's NAV is calculated at the close of the regular trading
               session of the NYSE (normally 4:00 p.m. New York time) each day
               that the NYSE is open. The NAV of Fund shares is not determined
               on days the NYSE is closed (generally, New Year's Day, Martin
               Luther King Day, Presidents' Day, Good Friday, Memorial Day,
               Independence Day, Labor Day, Thanksgiving and Christmas). In
               order to receive a day's price, your order must be received by
               the close of the regular trading session of the NYSE. The Fund's
               portfolio securities 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.
 
                                                        Shareholder's manual  27
<PAGE> 
 
SHAREHOLDER SERVICES AND ACCOUNT POLICIES
 
               JANUS XPRESSLINE(TM)
 
               Janus XpressLine, our electronic telephone service, offers you
               24-hour access by TouchTone(TM) telephone to obtain information
               on account balances, Fund performance or dividends. You can also
               make exchanges, purchases and redemptions in existing accounts,
               request literature about any Janus fund, or order duplicate
               statements. Janus XpressLine is accessed by calling
               1-888-979-7737. Calls are limited to five minutes.
 
               JANUS WEB SITE
 
               Janus maintains a Web site located at JANUS.COM. You can
               purchase, exchange and redeem shares and access information such
               as your account balance and the Fund's NAV through the Web site.
               In order to engage in transactions on our Web site, you must
               authorize us to transmit account information online and accept
               online instructions (see janus.com and follow the procedures
               accordingly). You may also need to have bank account information,
               wire instructions or other options established on your account.
               The Fund and its agents will not be responsible for any losses
               resulting from unauthorized transactions on our Web site when
               procedures designed for engaging in such transactions are
               followed. If you have questions, please call 1-800-975-9932 to
               speak to a Janus representative.
 
               ACCOUNT MINIMUMS
 
               Due to the proportionately higher costs of maintaining small
               accounts, Janus reserves the right to deduct a $10 minimum
               balance fee (or the value of the account if less than $10) from
               accounts with values below the minimums described on page 16 or
               to close such accounts. This policy will apply to accounts
               participating in the Automatic Monthly Investment Program only if
               your account balance does not reach the required minimum initial
               investment or falls below such minimum and you have discontinued
               monthly investments. This policy does not apply to
 
 28 Janus Overseas Fund
<PAGE> 
 
               accounts that fall below the minimums solely as a result of
               market value fluctuations. It is expected that accounts will be
               valued in September and the $10 fee will be assessed on the
               second Friday of September of each year. You will receive notice
               before we charge the $10 fee or close your account so that you
               may increase your account balance to the required minimum.
 
               TRANSACTIONS THROUGH PROCESSING ORGANIZATIONS
 
               You may purchase or sell Fund shares through a broker-dealer,
               bank or other financial institution, or an organization that
               provides recordkeeping and consulting services to 401(k) plans or
               other employee benefit plans (a "Processing Organization").
               Processing Organizations may charge you a fee for this service
               and may require different minimum initial and subsequent
               investments than the Fund. Processing Organizations may also
               impose other charges or restrictions different from those
               applicable to shareholders who invest in the Fund directly. A
               Processing Organization, rather than its customer, may be the
               shareholder of record of your shares. The Fund is not responsible
               for the failure of any Processing Organization to carry out its
               obligations to its customers. Certain Processing Organizations
               may receive compensation from Janus Capital or its affiliates and
               certain Processing Organizations may receive compensation from
               the Fund for shareholder recordkeeping and similar services.
 
               TAXPAYER IDENTIFICATION NUMBER
 
               On the application or other appropriate form, you will be asked
               to certify that your Social Security or taxpayer identification
               number is correct and that you are not subject to backup
               withholding for failing to report income to the IRS. If you are
               subject to the 31% backup withholding or you did not certify your
               taxpayer identification number, the IRS requires the Fund to
               withhold 31% of any dividends paid and redemption or exchange
               proceeds. In addition to the 31% backup withholding, you may be
               subject to a $50 fee to reimburse the Fund for any penalty that
               the IRS may impose.
 
                                                        Shareholder's manual  29
<PAGE> 
 
               SHARE CERTIFICATES
 
   
               Most shareholders choose not to hold their shares in certificate
               form because account transactions such as exchanges and
               redemptions cannot be completed until the certificate has been
               returned to the Fund. The Fund will issue share certificates upon
               written request only and reserves the right to charge a fee for
               this service. Share certificates will not be issued until the
               shares have been held for at least 15 days and will not be issued
               for accounts that do not meet the minimum investment
               requirements. Share certificates cannot be issued for retirement
               accounts. In addition, if the certificate is lost, there may be a
               replacement charge.
    
 
               INVOLUNTARY REDEMPTIONS
 
               The Fund reserves the right to close an account if the
               shareholder is deemed to engage in activities which are illegal
               or otherwise believed to be detrimental to the Fund.
 
               TELEPHONE TRANSACTIONS
 
               You may initiate many transactions by telephone. The Fund and its
               agents will not be responsible for any losses resulting from
               unauthorized transactions when procedures designed to verify the
               identity of the caller are followed.
 
               It may be difficult to reach an Investor Service Representative
               by telephone during periods of unusual market activity. If you
               are unable to reach a representative by telephone, please
               consider sending written instructions, stopping by a Service
               Center, calling the Janus XpressLine or visiting our Web site.
 
               TEMPORARY SUSPENSION OF SERVICES
 
               The Fund or its agents may, in case of emergency, temporarily
               suspend telephone transactions and other shareholder services.
 
 30 Janus Overseas Fund
<PAGE> 
 
               ADDRESS CHANGES
 
               To change the address on your account, call 1-800-525-3713 or
               send a written request signed by all account owners. Include the
               name of the Fund, the account number(s), the name(s) on the
               account and both the old and new addresses. Certain options may
               be suspended for 10 days following an address change unless a
               signature guarantee is provided.
 
               REGISTRATION CHANGES
 
               To change the name on an account, the shares are generally
               transferred to a new account. In some cases, legal documentation
               may be required. For more information call 1-800-525-3713.
 
               STATEMENTS AND REPORTS
 
   
               Investors participating in an automatic investment program will
               receive quarterly confirmations of all transactions. Dividend
               information will be distributed annually. In addition, the Fund
               will send you an immediate transaction confirmation statement
               after every non-systematic transaction.
    
 
   
               The Fund produces financial reports, which include a list of the
               Fund's portfolio holdings, semiannually and updates its
               prospectus annually. To reduce expenses, the Fund may choose to
               mail only one report or prospectus to your household, even if
               more than one person in the household has a Fund account. Please
               call 1-800-525-3713 if you would like to receive additional
               reports or prospectuses. The Fund reserves the right to charge a
               fee for additional statement and report requests.
    
 
                                                        Shareholder's manual  31
<PAGE> 
Management of the fund
 
INVESTMENT ADVISER
 
               Janus Capital Corporation, 100 Fillmore Street, Denver, Colorado
               80206-4928, is the investment adviser to the Fund and is
               responsible for the day-to-day management of its investment
               portfolio and other business affairs.
 
               Janus Capital began serving as investment adviser to Janus Fund
               in 1970 and currently serves as investment adviser to all of the
               Janus 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 the Fund's investments. Janus Capital also furnishes
               certain administrative, compliance and accounting services for
               the Fund, and may be reimbursed by the Fund 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 Fund and pays the salaries, fees and expenses of
               all Fund officers and those Trustees who are affiliated with
               Janus Capital.
 
               The Fund pays Janus Capital a management fee which is calculated
               daily and paid monthly. The advisory agreement with the Fund
               spells out the management fee and other expenses that the Fund
               must pay.
 
               The Fund incurs expenses not assumed by Janus Capital, including
               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. The Annual Fund Operating Expenses
               table on page 4 lists the actual management fee and total
               operating expenses of the Fund for the most recent fiscal year.
 
 32 Janus Overseas Fund
<PAGE> 
 
PORTFOLIO MANAGERS
 
HELEN YOUNG HAYES
- --------------------------------------------------------------------------------
                   is Executive Vice President and co-manager of the Fund,
                   which she has managed since its inception. Ms. Hayes
                   joined Janus Capital in 1987 and has also managed or co-
                   managed Janus Worldwide Fund since its inception. She
                   holds a Bachelor of Arts in Economics from Yale University
                   and received the Chartered Financial Analyst designation.
 
LAURENCE J. CHANG
- --------------------------------------------------------------------------------
   
                   is Executive Vice President and co-manager of the Fund,
                   which he has co-managed since April 1998, and assistant
                   portfolio manager of Janus Worldwide Fund. Mr. Chang
                   joined Janus Capital in 1993 as a research analyst. He
                   received an undergraduate degree with honors in Religion
                   and Philosophy from Dartmouth College and a Master's
                   Degree in Political Science from Stanford University. Mr.
                   Chang received the Chartered Financial Analyst
                   designation.
    
 
                                                      Management of the fund  33
<PAGE> 
Other information
 
               SIZE OF THE FUND
 
               The Fund has discontinued sales of its shares because its
               management and the Trustees believe that a substantial increase
               in size may adversely affect the Fund's ability to achieve its
               investment objective by reducing its flexibility in making
               investments and in effecting portfolio changes. Although sales to
               new investors have been discontinued, existing shareholders are
               permitted to continue to purchase shares and to reinvest any
               dividends or capital gains distributions. See the Shareholder's
               Manual beginning on page 14.
 
               YEAR 2000
 
   
               Preparing for Year 2000 is a high priority for Janus Capital,
               which has established a dedicated group to address this issue.
               Janus Capital has devoted considerable internal resources and has
               engaged one of the foremost experts in the field to help achieve
               Year 2000 readiness. Janus Capital does not anticipate that Year
               2000-related issues will have a material impact on its ability to
               continue to provide the Fund with service at current levels;
               however, Janus Capital cannot make any assurances that the steps
               it has taken to ensure Year 2000 readiness will be successful. In
               addition, there can be no assurance that Year 2000 issues will
               not affect the companies in which the Fund invests or worldwide
               markets and economies.
    
   
    
 
 34 Janus Overseas Fund
<PAGE> 
                                                                   
                                                         Distributions and taxes
 
DISTRIBUTIONS
 
   
               To avoid taxation of the Fund, the Internal Revenue Code requires
               the Fund to distribute net income and any net gains realized on
               its investments annually. The Fund'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.
               Dividends and capital gains distributions are normally declared
               and paid in December.
    
 
               HOW DISTRIBUTIONS AFFECT A FUND'S NAV
 
               Distributions are paid to shareholders as of the record date of
               the distribution of the Fund, regardless of how long the shares
               have been held. Dividends and capital gains awaiting distribution
               are included in the Fund's daily NAV. The share price of the Fund
               drops by the amount of the distribution, net of any subsequent
               market fluctuations. As an example, assume that on December 31,
               the Fund declared a dividend in the amount of $0.25 per share. If
               the Fund's share price was $10.00 on December 30, the Fund's
               share price on December 31 would be $9.75, barring market
               fluctuations. Shareholders should be aware that distributions
               from a taxable mutual fund are not value-enhancing and may create
               income tax obligations.
 
               "BUYING A DIVIDEND"
 
   
               If you purchase shares of the Fund just before the distribution,
               you will pay the full price for the shares and receive a portion
               of the purchase price back as a taxable distribution. This is
               referred to as "buying a dividend." In the above example, if you
               bought shares on December 30, you would have paid $10.00 per
               share. On December 31, the Fund would pay you $0.25 per share as
               a dividend and your shares would now be worth $9.75 per share.
               Unless your account is set up as a tax-deferred account,
               dividends paid to you would be included in your gross income for
               tax purposes, even though you may not have participated in the
    
 
                                                     Distributions and taxes  35
<PAGE> 
 
               increase in NAV of the Fund, whether or not you reinvested the
               dividends.
 
DISTRIBUTION OPTIONS
 
               When you open an account, you must specify on your application
               how you want to receive your distributions. You may change your
               distribution option at any time by writing the Fund at one of the
               addresses listed on page 14 or calling 1-800-525-3713. The Fund
               offers the following options:
 
               1. REINVESTMENT OPTION. You may reinvest your income dividends
                  and capital gains distributions in additional shares. This
                  option is assigned automatically if no other choice is made.
 
               2. CASH OPTION. You may receive your income dividends and capital
                  gains distributions in cash.
 
               3. REINVEST AND CASH OPTION. You may receive either your income
                  dividends or capital gains distributions in cash and reinvest
                  the other in additional shares.
 
               4. REDIRECT OPTION. You may direct your dividends or capital
                  gains to purchase shares of another Janus fund.
 
               The Fund reserves the right to reinvest into your account
               undeliverable and uncashed dividend and distribution checks that
               remain outstanding for six months in shares of the Fund at the
               NAV next computed after the check is cancelled. Subsequent
               distributions may also be reinvested.
 
TAXES
 
   
               As with any investment, you should consider the tax consequences
               of investing in the Fund. Any time you sell or exchange shares of
               a Fund in a taxable account, it is considered a taxable event.
               Depending on the purchase price and the sale price, you may have
               a gain or loss on the transaction. Any tax liabilities generated
               by your transactions are your responsibility.
    
 
               The following discussion does not apply to tax-deferred accounts,
               nor is it a complete analysis of the federal tax implications of
               investing in the Fund. You may wish to consult your own tax
 
 36 Janus Overseas Fund
<PAGE> 
 
               adviser. Additionally, state or local taxes may apply to your
               investment, depending upon the laws of your state of residence.
 
               TAXES ON DISTRIBUTIONS
 
               Dividends and distributions by the Fund are subject to federal
               income tax, regardless of whether the distribution is made in
               cash or reinvested in additional shares of the Fund.
               Distributions may be taxable at different rates depending on the
               length of time the Fund holds a security. In certain states, a
               portion of the dividends and distributions (depending on the
               source of the Fund's income) may be exempt from state and local
               taxes. Information regarding the tax status of income dividends
               and capital gains distributions will be mailed to shareholders on
               or before January 31st of each year.
 
               TAXATION OF THE FUND
 
               Dividends, interest and some capital gains received by the Fund
               on foreign securities may be subject to tax withholding or other
               foreign taxes. The Fund 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 an election is not made, any foreign taxes paid or accrued
               will represent an expense to the Fund.
 
               The Fund does not expect to pay federal income or excise taxes
               because it intends to meet certain requirements of the Internal
               Revenue Code. It is important that the Fund meets these
               requirements so that any earnings on your investment will not be
               taxed twice.
 
                                                     Distributions and taxes  37
<PAGE> 
Financial highlights
 
   
               The financial highlights table is intended to help you understand
               the Fund's financial performance through October 31st of each
               fiscal period shown. Items 1 through 9 reflect financial results
               for a single Fund share. The total returns in the table represent
               the rate that an investor would have earned (or lost) on an
               investment in the Fund (assuming reinvestment of all dividends
               and distributions). This information has been audited by
               PricewaterhouseCoopers LLP, whose report, along with the Fund's
               financial statements, are included in the Annual Report, which is
               available upon request and incorporated by reference into the
               SAI.
    
 
   
<TABLE>
<CAPTION>
                                JANUS OVERSEAS FUND
- ------------------------------------------------------------------------------------
                                                 Periods ending October 31st
                                          1998     1997     1996    1995    1994>(1)
<S>                                      <C>      <C>      <C>      <C>     <C>
  1. NET ASSET VALUE, BEGINNING OF
     PERIOD                              $17.94   $14.81   $11.58   $10.36   $10.00
    INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                 0.08     0.04     0.10    0.12    (0.02)
  3. Net gains or (losses) on
     securities (both realized and
     unrealized)                           0.54     3.39     3.34    1.10      0.38
  4. Total from investment operations      0.62     3.43     3.44    1.22      0.36
    LESS DISTRIBUTIONS:
  5. Dividends (from net investment
     income)                             (0.10)   (0.04)   (0.11)      --        --
  6. Dividends (in excess of net
     investment income)                      --       --       --      --        --
  7. Distributions (from capital gains)  (0.51)   (0.26)   (0.10)      --        --
  8. Total distributions                 (0.61)   (0.30)   (0.21)      --        --
  9. NET ASSET VALUE, END OF PERIOD      $17.95   $17.94   $14.81   $11.58   $10.36
 10. Total return*                        3.55%   23.56%   30.19%   11.78%    3.60%
 11. Net assets, end of period (in
     millions)                           $3,889   $3,205     $773    $111       $64
 12. Average net assets for the period
     (in millions)                       $3,949   $2,093     $335     $78       $37
 13. Ratio of gross expenses to average
     net assets**                         0.96%    1.03%    1.26%   1.76%       N/A
 14. Ratio of net expenses to average
     net assets**                         0.94%    1.01%    1.23%   1.73%     2.16%
 15. Ratio of net investment
     income/(loss) to average net
     assets**                             0.58%    0.81%    0.73%   0.36%   (0.64%)
 16. Portfolio turnover rate**             105%      72%      71%    188%      181%
- -------------------------------------------------------------------------
</TABLE>
    
 
(1) Fiscal period from May 2, 1994 (inception) to October 31, 1994.
  * Total return is not annualized for periods of less than one full year.
 ** Annualized for periods of less than one full year.
 
 38 Janus Overseas Fund
<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 Fund may
               invest. The Fund may invest in these instruments to the extent
               permitted by its investment objective and policies. The Fund is
               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
               Fund 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 equity 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
 
                                                Glossary of investment terms  39
<PAGE> 
 
               (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 SECURITIES are securities 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 securities 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, the 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 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 Fund must pay if
               these investments are profitable, the Fund may make various
               elections permitted by the tax laws. These elections could
               require that the Fund recognize taxable income, which in turn
               must be
 
 40 Janus Overseas Fund
<PAGE> 
 
               distributed, before the securities are sold and before cash is
               received to pay the distributions.
 
               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 the
               Fund and a simultaneous agreement by the seller (generally a bank
               or dealer) to repurchase the security from the Fund 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, the Fund 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
               the Fund to another party (generally a bank or dealer) in return
               for cash and an agreement by the Fund to buy the security back at
               a specified price and time. This technique will be used primarily
               to provide cash to satisfy unusually heavy redemption requests,
               or for other temporary or emergency purposes.
 
               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.
 
                                                Glossary of investment terms  41
<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 stocks
               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
               Fund does not earn interest on such securities until settlement
               and bears 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.
 
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
               Fund may enter into forward currency contracts to hedge against
               declines on 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. It 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 Fund may buy and sell
               futures contracts on foreign currencies, securities and financial
               indices
 
 42 Janus Overseas Fund
<PAGE> 
 
               including interest rates or an index of U.S. government, foreign
               government, equity or fixed-income securities. The Fund 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. The Fund bears the
               market risk of an investment in the underlying instruments, as
               well as the credit risk of the issuer.
 
               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 Fund may purchase and
               write put and call options on securities, securities indices and
               foreign currencies.
 
                                                Glossary of investment terms  43
<PAGE> 
 
                       This page intentionally left blank
 
 44
<PAGE> 
 
                       This page intentionally left blank
<PAGE> 
 
[JANUS LOGO]

          1-800-525-3713
          P.O. Box 173375
          Denver, Colorado 80217-3375
          janus.com
 
You can request other information, including a Statement of
Additional Information, Annual Report or Semiannual Report, free of
charge, by contacting Janus at 1-800-525-3713 or visiting our Web
site at janus.com. In the Fund's Annual Report, you will find a
discussion of the market conditions and investment strategies that
significantly affected the Fund's performance during its last fiscal
year. Other information is also available from financial
intermediaries that sell shares of the Fund.
 
The Statement of Additional Information provides detailed
information about the Fund and is incorporated into this Prospectus
by reference. You may review the Fund's Statement of Additional
Information at the Public Reference Room of the SEC or get text only
copies for a fee, by writing to or calling the Public Reference
Room, Washington, D.C. 20549-6009 (1-800-SEC-0330). You may obtain
the Statement of Additional Information for free from the SEC's Web
site at http://www.sec.gov.
 
              Investment Company Act File No. 811-1879
 
  3166
<PAGE> 
                             [JANUS LOGO]
 
                       Janus Money Market Funds
                       Institutional Shares
 
                                    PROSPECTUS
 
                                    FEBRUARY 17, 1999
                                    Janus Money Market Fund
                                    Janus Government Money Market Fund
                                    Janus Tax-Exempt Money Market Fund
 
                       Janus Money Market Fund, Janus Government Money Market
                       Fund, and Janus Tax-Exempt Money Market Fund are
                       designed for investors who seek maximum current income
                       consistent with stability of capital. This prospectus
                       offers a separate class of shares of each Fund
                       (collectively, the "Shares") exclusively to
                       institutional and individual clients meeting minimum
                       investment requirements ($5,000,000 for Janus Money
                       Market Fund and $250,000 for Janus Government Money
                       Market Fund and Janus Tax-Exempt Money Market Fund).
                       Each Fund is a separate series of Janus Investment
                       Fund, an open-end management investment company.
 
                       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]
<PAGE> 
 
                                                              Table of contents
 
<TABLE>
                <S>                                               <C>
                RISK/RETURN SUMMARY
                   Janus Money Market Fund......................    2
                   Janus Government Money Market Fund...........    2
                   Janus Tax-Exempt Money Market Fund...........    2
                   Fees and expenses............................    5
                INVESTMENT OBJECTIVES, PRINCIPAL INVESTMENT
                STRATEGIES AND RISKS
                   Investment objectives and principal
                   investment strategies........................    6
                   Common investment policies...................    7
                   Types of investments.........................    7
                   Common investment techniques.................   10
                MANAGEMENT OF THE FUNDS
                   Investment adviser...........................   13
                   Portfolio managers...........................   13
                   Assistant portfolio manager..................   14
                DISTRIBUTIONS AND TAXES............ ............   15
                FINANCIAL HIGHLIGHTS.............. .............   17
                OTHER INFORMATION............... ...............   20
                SHAREHOLDER'S GUIDE
                   How to open an account.......................   24
                   Purchasing shares............................   25
                   How to exchange shares.......................   28
                   How to redeem shares.........................   28
                   Special shareholder services and other
                   information..................................   30
 
</TABLE>
 
                                                            Table of contents  1
<PAGE> 
Risk return summary
 
1. WHAT ARE THE INVESTMENT OBJECTIVES OF THE MONEY MARKET FUNDS?
 
- --------------------------------------------------------------------------------
 
               - JANUS MONEY MARKET FUND and JANUS GOVERNMENT MONEY MARKET
                 FUND seek maximum current income to the extent consistent
                 with stability of capital.
 
               - JANUS TAX-EXEMPT MONEY MARKET FUND seeks maximum current
                 income that is exempt from federal income taxes to the
                 extent consistent with stability of capital.
 
               The Funds' Trustees may change these objectives without a
               shareholder vote and the Funds will notify you of any changes
               that are material. If there is a material change in a Fund's
               objective or policies, you should consider whether that Fund
               remains an appropriate investment for you. There is no guarantee
               that any Fund will meet its objective.
 
2. WHAT ARE THE MAIN INVESTMENT STRATEGIES OF THE MONEY MARKET FUNDS?
 
               The Money Market Funds will invest only in high-quality, short-
               term money market instruments that present minimal credit risks,
               as determined by Janus Capital.
 
               JANUS MONEY MARKET FUND invests primarily in high quality debt
               obligations and obligations of financial institutions. Debt
               obligations may include commercial paper, notes and bonds, and
               variable amount master demand notes. Obligations of financial
               institutions include certificates of deposit and time deposits.
 
               JANUS GOVERNMENT MONEY MARKET FUND invests exclusively in
               obligations issued and/or guaranteed as to principal and interest
               by the United States government or by its agencies and
               instrumentalities and repurchase agreements secured by such
               obligations.
 
               JANUS TAX-EXEMPT MONEY MARKET FUND invests primarily in municipal
               securities whose interest is exempt from federal income taxes,
               including the federal alternative minimum tax. The Fund may
               invest up to 20% of its net assets in taxable securities and may
               invest without limit in cash and cash equivalents that may be
 
 2 Janus Money Market Funds - Institutional Shares
<PAGE> 
 
               federally taxable to the extent the portfolio manager cannot
               locate investment opportunities with desirable risk/reward
               characteristics.
 
3. WHAT ARE THE MAIN RISKS OF INVESTING IN THE MONEY MARKET FUNDS?
 
               The Funds' yields will vary as the short-term securities in their
               portfolios mature and the proceeds are reinvested in securities
               with different interest rates. Over time, the real value of a
               Fund's yield may be eroded by inflation. Although the Money
               Market Funds invest only in high-quality, short-term money market
               instruments, there is a risk that the value of the securities
               they hold will fall as a result of changes in interest rates, an
               issuer's actual or perceived credit-worthiness or an issuer's
               ability to meet its obligations.
 
               Economic, business, or political development or change affecting
               tax-exempt securities may affect Janus Tax-Exempt Money Market
               Fund's holdings similarly. This could result in increased
               variability of performance. Income from the Fund's investments
               may be taxable by your state or local government.
 
               An investment in the Money Market Funds is not a deposit of a
               bank and is not insured or guaranteed by the Federal Deposit
               Insurance Corporation or any other government agency. Although
               the Funds seek to preserve the value of your investment at $1.00
               per share, it is possible to lose money by investing in these
               Funds.
 
   
               The following information illustrates how Institutional Shares of
               each Money Market Fund's performance has varied over time. The
               bar charts depict the change in performance from year to year.
    
 
                                                          Risk return summary  3
<PAGE> 
 
                JANUS MONEY MARKET FUND - INSTITUTIONAL SHARES

A BAR CHART showing Annual Total Returns for Janus Money Market Fund - 
Institutional Shares from 1996 through 1998:
   
                Annual returns for periods ended 12/31

                5.53%          5.72%          5.67%
                1996           1997           1998

Each percentage is represented by a bar of proportionate size with the actual 
total return printed above the bar.

                Best Quarter:  4th-1997 1.45%;  Worst Quarter:  1st-1997 1.33%
    

 
                JANUS GOVERNMENT MONEY MARKET FUND - INSTITUTIONAL SHARES

A BAR CHART showing Annual Total Returns for Janus Government Money Market Fund
- - Institutional Shares from 1996 through 1998:
   
                Annual returns for periods ended 12/31

                5.44%          5.59%           5.53%
                1996           1997            1998

Each percentage is represented by a bar of proportionate size with the actual
total return printed above the bar.

                Best Quarter:  4th-1997 1.42%;  Worst Quarter:  1st-1997 1.29%
    
 
                JANUS TAX-EXEMPT MONEY MARKET FUND - INSTITUTIONAL SHARES

A BAR CHART showing Annual Total Returns for Janus Tax-Exempt Money Market Fund 
- - Institutional Shares from 1996 through 1998.
   
                Annual returns for periods ended 12/31

                3.64%          3.68%             3.65%
                1996           1997              1998

Each percentage is represented by a bar of proportionate size with the actual
total return printed above the bar.

                Best Quarter:  2nd-1997 0.98%;  Worst Quarter:  1st-1997 0.81%
    

   
               The 7-day yield on December 31, 1998 was 5.43% for Janus Money
               Market Fund - Institutional Shares; 5.17% for Janus Government
               Money Market Fund - Institutional Shares; and 3.92% for Janus
               Tax-Exempt Money Market Fund - Institutional Shares,
               respectively. For the Funds' current yields, call the Janus
               XpressLine(TM) at 1-888-979-7737.
    
 
               The Money Market Funds' past performance does not necessarily
               indicate how they will perform in the future.
 
 4 Janus Money Market Funds - Institutional Shares
<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 Funds.
 
               ANNUAL FUND OPERATING EXPENSES are paid out of a Fund'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 describes the fees and expenses that you may pay if
               you buy and hold Shares of the Funds. It is based upon gross
               expenses (without the effect of expense offset arrangements) for
               the fiscal year ended October 31, 1998.
    
 
<TABLE>
<CAPTION>
                                  Janus Money      Janus Government    Janus Tax-Exempt
      Institutional Shares        Market Fund      Money Market Fund   Money Market Fund
   <S>                         <C>                 <C>                 <C>               
   Management Fee                    .20 %               .20 %               .20 %
   Other Expenses                    .15 %               .15 %               .15 %
   Total Annual Fund
     Operating Expenses
     Without Waivers*                .35 %               .35 %               .35 %
   Total Waivers                    (.20)%              (.20)%              (.20)%
   Total Annual Fund
     Operating Expenses With
     Waivers*                        .15 %               .15 %               .15 %
</TABLE>
 
   
  * All expenses are stated both with and without contractual waivers by
    Janus Capital. Janus Capital has agreed to continue such waivers until
    at least the next annual renewal of the advisory agreements.
    
 
  EXAMPLE:
  THE FOLLOWING EXAMPLE IS BASED ON FUND EXPENSES WITHOUT WAIVERS.
  This example is intended to help you compare the cost of investing in the
  Funds with the cost of investing in other mutual funds. The example
  assumes that you invest $10,000 in each of the Funds 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 Funds' 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    5 Years    10 Years
                                             ----------------------------------------
   <S>                                       <C>       <C>        <C>        <C>      
   Janus Money Market Fund                    $36       $113       $197        $443
   Janus Government Money Market Fund         $36       $113       $197        $443
   Janus Tax-Exempt Money Market Fund         $36       $113       $197        $443
</TABLE>
 
                                                          Risk return summary  5
<PAGE> 
Investment objectives, principal 
           investment strategies 
           and risks
 
               This section takes a closer look at the investment objective of
               each of the Funds, their principal investment strategies and
               certain risks of investing in the Funds. Strategies and policies
               that are noted as "fundamental" cannot be changed without a
               shareholder vote.
 
               Money market funds are subject to certain specific SEC rule
               requirements. Among other things, the Funds are limited to
               investing in U.S. dollar-denominated instruments with a remaining
               maturity of 397 days or less (as calculated pursuant to Rule 2a-7
               under the 1940 Act).
 
               JANUS MONEY MARKET FUND
               Janus Money Market Fund seeks maximum current income to the
               extent consistent with stability of capital. It pursues its
               objective by investing primarily in high quality debt obligations
               and obligations of financial institutions. Debt obligations may
               include commercial paper, notes and bonds, and variable amount
               master demand notes. Obligations of financial institutions
               include certificates of deposit and time deposits.
 
               JANUS GOVERNMENT MONEY MARKET FUND
               Janus Government Money Market Fund seeks maximum current income
               to the extent consistent with stability of capital. It pursues
               its objective by investing exclusively in obligations issued
               and/or guaranteed as to principal and interest by the United
               States government or by its agencies and instrumentalities and
               repurchase agreements secured by such obligations.
 
               JANUS TAX-EXEMPT MONEY MARKET FUND
               Janus Tax-Exempt Money Market Fund seeks maximum current income
               that is exempt from federal income taxes to the extent consistent
               with stability of capital. It pursues it objective by investing
               primarily in municipal securities whose interest is exempt from
               federal income taxes, including the federal alternative minimum
               tax. The Fund may invest up to 20% of its net assets in
 
 6 Janus Money Market Funds - Institutional Shares
<PAGE> 
 
               taxable securities and may invest without limit in cash and cash
               equivalents to the extent the portfolio manager cannot locate
               investment opportunities with desirable risk/reward
               characteristics.
 
               COMMON INVESTMENT POLICIES
 
               Each of the Money Market Funds will:
 
               - invest in high quality, short-term money market instruments
                 that present minimal credit risks, as determined by Janus
                 Capital
 
               - invest only in U.S. dollar-denominated instruments that have a
                 remaining maturity of 397 days or less (as calculated pursuant
                 to Rule 2a-7 under the 1940 Act)
 
               - maintain a dollar-weighted average portfolio maturity of 90
                 days or less
 
               TYPES OF INVESTMENTS
 
               JANUS MONEY MARKET FUND
 
               Janus Money Market Fund invests primarily in:
 
               - high quality debt obligations
 
               - obligations of financial institutions
 
               This Fund may also invest (to a lesser degree) in:
 
               - U.S. Government Securities (securities issued or guaranteed by
                 the U.S. government, its agencies and instrumentalities)
 
               - municipal securities
 
               DEBT OBLIGATIONS
               The Fund may invest in debt obligations of domestic issuers. Debt
               obligations include:
 
               - commercial paper
 
               - notes and bonds
 
             Investment objectives, principal investment strategies and risks  7
<PAGE> 
 
               - variable amount master demand notes (the payment obligations on
                 these instruments may be backed by securities, swap agreements
                 or other assets, by a guarantee of a third party or solely by
                 the unsecured promise of the issuer to make payments when due)
 
               - privately issued commercial paper or other securities that are
                 restricted as to disposition under the federal securities laws
 
               OBLIGATIONS OF FINANCIAL INSTITUTIONS
               Examples of obligations of financial institutions include:
 
               - negotiable certificates of deposit, bankers' acceptances, time
                 deposits and other obligations of U.S. banks (including savings
                 and loan associations) having total assets in excess of one
                 billion dollars and U.S. branches of foreign banks having total
                 assets in excess of ten billion dollars
 
               - Eurodollar and Yankee bank obligations (Eurodollar bank
                 obligations are dollar-denominated certificates of deposit or
                 time deposits issued outside the U.S. capital markets by
                 foreign branches of U.S. banks and by foreign banks. Yankee
                 bank obligations are dollar-denominated obligations issued in
                 the U.S. capital markets by foreign banks)
 
               - other U.S. dollar-denominated obligations of foreign banks
                 having total assets in excess of ten billion dollars that Janus
                 Capital believes are of an investment quality comparable to
                 obligations of U.S. banks in which the Fund may invest
 
               Foreign, Eurodollar (and to a limited extent, Yankee) bank
               obligations are subject to certain sovereign risks. One such risk
               is the possibility that a foreign government might prevent
               dollar-denominated funds from flowing across its borders. Other
               risks include: adverse political and economic developments in a
               foreign country; the extent and quality of government regulation
               of financial markets and institutions; the imposition of foreign
               withholding taxes; and expropriation or nationalization of
               foreign issuers.
 
 8 Janus Money Market Funds - Institutional Shares
<PAGE> 
 
               JANUS GOVERNMENT MONEY MARKET FUND
 
               Janus Government Money Market Fund invests exclusively in:
 
               - U.S. Government Securities
 
               - repurchase agreements secured by such obligations
 
               JANUS TAX-EXEMPT MONEY MARKET FUND
 
               Janus Tax-Exempt Money Market Fund invests primarily in municipal
               securities whose interest is exempt from federal income taxes,
               including the federal alternative minimum tax. However, this Fund
               reserves the right to invest:
 
               - up to 20% of its net assets in securities whose interest is
                 federally taxable
 
               - without limit in cash and cash equivalents, including
                 obligations that may be federally taxable (when its portfolio
                 manager is unable to locate investment opportunities with
                 desirable risk/reward characteristics)
 
               MUNICIPAL SECURITIES
               Municipal securities include:
 
               - municipal notes
 
               - short-term municipal bonds
 
               - participation interests in municipal securities
 
               At times, the Fund may invest more than 25% of its total assets
               in tax-exempt securities that are related in such a way that an
               economic, business, or political development or change affecting
               one such security could similarly affect the other securities.
               Examples include securities whose issuers are located in the same
               state, or securities whose interest is derived from revenues of
               similar type projects. The Fund may also invest more than 25% of
               its assets in industrial development bonds or participation
               interests therein.
 
             Investment objectives, principal investment strategies and risks  9
<PAGE> 
 
               Yields on municipal securities are dependent on a variety of
               factors, including general market conditions, the size of a
               particular offering, the maturity of the obligation and the
               rating of the issue. Municipal securities investments may lose
               money if the municipal securities issuer does not pay principal
               and interest when due. Bankruptcy, insolvency and other laws
               affecting the rights and remedies of creditors may affect the
               issuer's ability to pay.
 
               MUNICIPAL LEASES
               The Fund may invest in municipal leases or participation
               interests therein. The issuing municipality's credit will not
               necessarily back a lease obligation. Interest on lease
               obligations may become taxable if the lease is assigned. The Fund
               may incur losses if the issuer does not appropriate funds for the
               lease payment on an annual basis.
 
               TAXABLE INVESTMENTS
               As discussed above, although the Fund will attempt to invest
               substantially all of its assets in municipal securities whose
               interest is exempt from federal income tax, the Fund may under
               certain circumstances invest in certain securities whose interest
               is subject to such taxation, as described under Janus Money
               Market Fund's investments.
 
               COMMON INVESTMENT TECHNIQUES
 
               The following is a description of other investment techniques
               that the Money Market Funds may use:
 
               PARTICIPATION INTERESTS
               A participation interest gives a Money Market Fund a
               proportionate, undivided interest in underlying debt securities
               and usually carries a demand feature.
 
               DEMAND FEATURES
               Demand features give the Money Market Funds the right to resell
               securities at specified periods prior to their maturity dates.
 
 10 Janus Money Market Funds - Institutional Shares
<PAGE> 
 
               Demand features may shorten the life of a variable or floating
               rate security, enhance the instrument's credit quality and
               provide a source of liquidity.
 
               Demand features are often issued by third party financial
               institutions, generally domestic and foreign banks. Accordingly,
               the credit quality and liquidity of the Money Market Funds'
               investments may be dependent in part on the credit quality of the
               banks supporting the Money Market Funds' investments. This will
               result in exposure to risks pertaining to the banking industry,
               including the foreign banking industry. Brokerage firms and
               insurance companies also provide certain liquidity and credit
               support. A substantial portion of the Janus Tax-Exempt Money
               Market Fund's portfolio in particular may consist of securities
               backed by banks and other financial institutions, and thus
               adverse changes in the credit quality of these institutions could
               cause losses to the Fund and affect its share price.
 
               VARIABLE AND FLOATING RATE SECURITIES
               The Money Market Funds may invest in securities which have
               variable or floating rates of interest. These securities pay
               interest at rates that are adjusted periodically according to a
               specified formula, usually with reference to an interest rate
               index or market interest rate. Variable and floating rate
               securities are subject to changes in value based on changes in
               market interest rates or changes in the issuer's or guarantor's
               creditworthiness.
 
               MORTGAGE- AND ASSET-BACKED SECURITIES
               The Money Market Funds may purchase fixed or variable rate
               mortgage-backed securities issued by the Government National
               Mortgage Association, Federal National Mortgage Association, the
               Federal Home Loan Mortgage Corporation, or other governmental or
               government-related entity. Janus Money Market Fund and Janus
               Tax-Exempt Money Market Fund may purchase other mortgage- and
               asset-backed securities including securities backed by automobile
               loans, equipment leases or credit card receivables.
 
            Investment objectives, principal investment strategies and risks  11
<PAGE> 
 
               Unlike traditional debt instruments, payments on these securities
               include both interest and a partial payment of principal.
               Prepayments of the principal of underlying loans may shorten the
               effective maturities of these securities and may result in a Fund
               having to reinvest proceeds at a lower interest rate.
 
               REPURCHASE AGREEMENTS
               Each Money Market Fund may enter into a collateralized repurchase
               agreements. Repurchase agreements are transactions in which a
               Fund purchases securities and simultaneously commits to resell
               those securities to the seller at an agreed-upon price on an
               agreed-upon future date. The repurchase price reflects a market
               rate of interest and is collateralized by cash or securities.
 
               If the seller of the securities underlying a repurchase agreement
               fails to pay the agreed resale price on the agreed delivery date,
               a Money Market Fund may incur costs in disposing of the
               collateral and may experience losses if there is any delay in its
               ability to do so.
 
 12 Janus Money Market Funds - Institutional Shares
<PAGE> 
                           Management of the Funds
 
INVESTMENT ADVISER
 
               Each Fund has a separate Investment Advisory Agreement with Janus
               Capital, 100 Fillmore Street, Denver, Colorado 80206-4923. Janus
               Capital has served as investment adviser to Janus Fund since 1970
               and currently serves as investment adviser to all of the Janus
               funds, acts as sub-adviser for a number of private-label mutual
               funds and provides separate account advisory services for
               institutional accounts.
 
   
               Pursuant to the Investment Advisory Agreements, Janus Capital
               furnishes continuous advice and recommendations concerning each
               Fund's investments. Each of the Funds has agreed to compensate
               Janus Capital for its advisory services by the monthly payment of
               a fee at the annual rate of 0.20% of the value of the average
               daily net assets of each Fund. However, Janus Capital has agreed
               to waive a portion of its fee and accordingly, the advisory fee
               of each Fund will be calculated at the annual rate of 0.10% of
               the value of each Fund's average daily net assets. Janus Capital
               has agreed to continue such waivers until at least the next
               annual renewal of the advisory agreements. You will be notified
               of any change in this limit.
    
 
PORTFOLIO MANAGERS
 
   
SHARON S. PICHLER
    
- --------------------------------------------------------------------------------
   
                   is Executive Vice President of Janus Money Market Fund,
                   Janus Government Money Market Fund and Janus Tax-Exempt
                   Money Market Fund. She is portfolio manager of Janus Money
                   Market Fund and Janus Tax-Exempt Money Market Fund, which
                   she has managed since inception. She previously served as
                   portfolio manager of Janus Government Money Market Fund
                   from inception to February 1999. She holds a Bachelor of
                   Arts in Economics from Michigan State University and a
                   Master of Business Administration from the University of
                   Texas at San Antonio. Ms. Pichler received the Chartered
                   Financial Analyst designation.
    
 
                                                     Management of the Funds  13
<PAGE> 
 
   
J. ERIC THORDERSON
    
- --------------------------------------------------------------------------------
   
                   is portfolio manager of Janus Government Money Market Fund
                   which he has managed since February 1999. Prior to
                   assuming management of the Fund, he served as assistant
                   portfolio manager of Janus Money Market Fund, Janus
                   Government Money Market Fund and Janus Tax-Exempt Money
                   Market Fund. He joined Janus Capital in May 1996 as a
                   senior fixed income analyst. Prior to joining Janus
                   Capital, he was a portfolio manager for USAA Investment
                   Management Company from 1991 to 1996. He holds a Bachelor
                   of Arts in Business Administration from Wayne State
                   University and a Master's Degree in Business
                   Administration from the University of Illinois. Mr.
                   Thorderson received the Chartered Financial Analyst
                   designation.
    
 
   
ASSISTANT PORTFOLIO MANAGER
    
 
   
JEANINE M. MORRONI
    
- --------------------------------------------------------------------------------
   
                   is assistant portfolio manager of Janus Government Money
                   Market Fund. Ms. Morroni joined Janus Capital in January
                   1994 as a Fund Accountant and began trading short-term
                   securities in July 1994. She has been a credit analyst for
                   the Money Market Funds since 1996. Prior to joining Janus
                   Capital, she worked as a Fund Accountant at Oppenheimer
                   Management Corporation. She holds a Bachelor of Science in
                   Accounting from Colorado State University. She is a
                   candidate for the Chartered Financial Analyst designation.
    
 
 14 Janus Money Market Funds - Institutional Shares
<PAGE> 
                           Distributions and taxes
 
               Dividends representing substantially all of the net investment
               income and any net realized gains on sales of securities are
               declared daily, Saturdays, Sundays and holidays included, and
               distributed on the last business day of each month. If a month
               begins on a Saturday, Sunday or holiday, dividends for those days
               are declared at the end of the preceding month and distributed on
               the first business day of the month. Distributions will be
               reinvested in Shares of a Fund or wired to a predesignated bank
               account at the election of the shareholder. If no election is
               made, all distributions will be reinvested in additional Shares
               of a Fund.
 
   
               Shares purchased by wire on a day on which the New York Stock
               Exchange ("NYSE") and the Federal Reserve Banks are open ("bank
               business day") will receive that day's dividend if the purchase
               is effected prior to 3:00 p.m. (New York time) for Janus Money
               Market Fund, 5:00 p.m. for Janus Government Money Market Fund and
               12:00 p.m. for Janus Tax-Exempt Money Market Fund. Otherwise,
               such Shares begin to accrue dividends on the first bank business
               day following receipt of the order.
    
 
   
               Redemption orders effected on any particular day will generally
               receive dividends declared through the day of redemption.
               However, redemptions made by wire which are received prior to
               3:00 p.m. (New York time) for Janus Money Market Fund, 5:00 p.m.
               for Janus Government Money Market Fund and 12:00 p.m. for Janus
               Tax-Exempt Money Market Fund on a bank business day will result
               in Shares being redeemed that day. Proceeds of such a redemption
               will normally be sent to the predesignated account on that day
               and that day's dividend will not be received. Requests for
               redemptions made by wire which are received after 3:00 p.m. for
               Janus Money Market Fund, after 5:00 p.m. for Janus Government
               Money Market Fund, and after 12:00 p.m. for Janus Tax-Exempt
               Money Market Fund will be processed on that day and receive that
               day's dividend, but will not be wired until the following bank
               business day.
    
 
               The Funds reserve the right to require purchase and redemption
               requests prior to these times on days when the bond market or the
               NYSE close early.
 
                                                     Distributions and taxes  15
<PAGE> 
 
               Distributions for all of the Funds (except Janus Tax-Exempt Money
               Market Fund) are taxable income and are subject to federal income
               tax (except for shareholders exempt from income tax), whether
               such distributions are received in cash or are reinvested in
               additional Shares. Full information regarding the tax status of
               income dividends and any capital gains distributions will be
               mailed to shareholders for tax purposes on or before January 31st
               of each year. Because the Funds are money market funds, they do
               not anticipate making any capital gains distributions.
 
               Janus Tax-Exempt Money Market Fund anticipates that substantially
               all income dividends it pays will be exempt from federal income
               tax. However, dividends attributable to interest on taxable
               investments, together with distributions from any net realized
               capital gains, are taxable. In addition, interest on certain
               private activity bonds is a preference item for purposes of the
               individual and corporate alternative minimum taxes. To the extent
               that the Fund earns such income, shareholders who are subject to
               the alternative minimum tax must include such income as a
               preference item. The Fund will advise shareholders of the
               percentage of dividends, if any, subject to the alternative
               minimum tax.
 
   
               Dividends and capital gains distributions may also be subject to
               state and local taxes. In certain states some portion of
               dividends and distributions (depending on the sources of the
               Fund's net income) of Janus Tax-Exempt Money Market Fund may be
               exempt from state and local taxes. Shareholders should consult
               their own tax adviser regarding exemption from any applicable
               state and local tax, as well as the tax treatment of any
               dividends or distributions from the Shares.
    
 
               The Funds intend to comply with provisions of the Internal
               Revenue Code applicable to investment companies, and thus it is
               not expected that any of the Funds will be required to pay any
               federal income or excise taxes. The SAI further explains the
               Funds' tax status.
 
 16 Janus Money Market Funds - Institutional Shares
<PAGE> 
                             Financial highlights
 
   
               The financial highlights tables are intended to help you
               understand the financial performance of the Fund's Shares through
               October 31st of each fiscal period shown. Items 1 through 8
               reflect financial results for a single Fund share. The total
               returns in the tables represent the rate that an investor would
               have earned (or lost) on an investment in the Shares of each of
               the Funds, (assuming the reinvestment of all dividends and
               distributions). This information has been audited by
               PricewaterhouseCoopers LLP, whose report, along with the Funds'
               financial statements, are included in the Annual Report, which is
               available upon request, and incorporated by reference into the
               SAI.
    
 
   
<TABLE>
<CAPTION>
                     JANUS MONEY MARKET FUND - INSTITUTIONAL SHARES
- ----------------------------------------------------------------------------------------
                                                         Periods ending October 31st
                                                       1998     1997     1996    1995(1)
<S>                                                   <C>      <C>      <C>      <C>
  1.  NET ASSET VALUE, BEGINNING OF PERIOD             $1.00    $1.00    $1.00    $1.00
      INCOME FROM INVESTMENT OPERATIONS:
  2.  Net investment income                             0.06     0.06     0.05     0.03
  3.  Net gains or (losses) on securities (both
      realized and unrealized)                            --       --       --       --
  4.  Total from investment operations                  0.06     0.06     0.05     0.03
      LESS DIVIDENDS AND DISTRIBUTIONS:
  5.  Dividends (from net investment income)          (0.06)   (0.06)   (0.05)   (0.03)
  6.  Distributions (from capital gains)                  --       --       --       --
  7.  Total dividends and distributions               (0.06)   (0.06)   (0.05)   (0.03)
  8.  NET ASSET VALUE, END OF PERIOD                  $1.00    $1.00    $1.00    $1.00
  9.  Total return*                                    5.72%    5.71%    5.61%    3.25%
  10. Net assets, end of period (in millions)         $4,974   $2,771   $1,706     $305
  11. Average net assets for the period (in
      millions)                                       $3,621   $2,545     $874     $202
  12. Ratio of expenses to average net assets**        0.15%(2)  0.15%(2)  0.15%(2)  0.15%(2)
  13. Ratio of net investment income to average net
      assets**                                         5.58%    5.54%    5.41%    5.86%
- ----------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Period from April 17, 1995 (inception of Shares) through October 31, 1995.
(2) The ratio was .35% before waiver.
 *  Total return is not annualized for periods of less than one full year.
**  Annualized for periods of less than one full year.
 
                                                        Financial highlights  17
<PAGE> 
 
   
<TABLE>
<CAPTION>
                JANUS GOVERNMENT MONEY MARKET FUND -INSTITUTIONAL SHARES
- ----------------------------------------------------------------------------------------
                                                         Periods ending October 31st
                                                       1998     1997     1996    1995(1)
<S>                                                   <C>      <C>      <C>      <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD              $1.00    $1.00    $1.00    $1.00
    INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                              0.05     0.05     0.05     0.03
  3. Net gains or (losses) on securities (both
     realized and unrealized)                             --       --       --       --
  4. Total from investment operations                   0.05     0.05     0.05     0.03
    LESS DIVIDENDS AND DISTRIBUTIONS:
  5. Dividends (from net investment income)           (0.05)   (0.05)   (0.05)   (0.03)
  6. Distributions (from capital gains)                   --       --       --       --
  7. Total dividends and distributions                (0.05)   (0.05)   (0.05)   (0.03)
  8. NET ASSET VALUE, END OF PERIOD                    $1.00    $1.00    $1.00    $1.00
  9. Total return*                                     5.59%    5.58%    5.50%    3.20%
  10. Net assets, end of period (in millions)           $821      $36      $59      $44
  11. Average net assets for the period (in
      millions)                                         $321      $57      $53      $25
  12. Ratio of expenses to average net assets**        0.15%(2)  0.15%(2)  0.15%(2)  0.15%(2)
  13. Ratio of net investment income to average net
      assets**                                         5.42%    6.04%    5.34%    5.75%
- ----------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Period from April 17, 1995 (inception of Shares) through October 31, 1995.
(2) The ratio was .35% before waiver.
 *  Total return is not annualized for periods of less than one full year.
**  Annualized for periods of less than one full year.
 
 18 Janus Money Market Funds - Institutional Shares
<PAGE> 
 
   
<TABLE>
<CAPTION>
               JANUS TAX-EXEMPT MONEY MARKET FUND - INSTITUTIONAL SHARES
- ----------------------------------------------------------------------------------------
                                                         Periods ending October 31st
                                                       1998     1997     1996    1995(1)
<S>                                                   <C>      <C>      <C>      <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD              $1.00    $1.00    $1.00    $1.00
    INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                              0.04     0.04     0.04     0.02
  3. Net gains or (losses) on securities (both
     realized and unrealized)                             --       --       --       --
  4. Total from investment operations                   0.04     0.04     0.04     0.02
    LESS DIVIDENDS AND DISTRIBUTIONS:
  5. Dividends (from net investment income)           (0.04)   (0.04)   (0.04)   (0.02)
  6. Distributions (from capital gains)                   --       --       --       --
  7. Total dividends and distributions                (0.04)   (0.04)   (0.04)   (0.02)
  8. NET ASSET VALUE, END OF PERIOD                    $1.00    $1.00    $1.00    $1.00
  9. Total return*                                     3.67%    3.67%    3.74%    2.09%
  10. Net assets, end of period (in millions)            $41       $4       $2      $11
  11. Average net assets for the period (millions)       $19       $3       $2       $1
  12. Ratio of expenses to average net assets**        0.15%(2)  0.15%(2)  0.15%(2)  0.15%(2)
  13. Ratio of net investment income to average net
      assets**                                         3.60%    3.94%    3.82%    3.82%
- ----------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Period from April 17, 1995 (inception of Shares) through October 31, 1995.
(2) The ratio was .35% before waiver.
 *  Total return is not annualized for periods of less than one full year.
**  Annualized for periods of less than one full year.
 
                                                        Financial highlights  19
<PAGE> 
Other information
 
               CLASSES OF SHARES
 
               Each Fund currently offers three classes of shares by separate
               prospectuses. The Shares offered by this Prospectus are available
               only to institutional clients, including corporations,
               foundations and trusts, and individuals meeting certain minimum
               investment requirements. A second class of shares of each Fund,
               Service Shares, are available only through banks or other
               Financial Institutions that meet minimum investment requirements
               in connection with trust accounts, cash management programs and
               similar programs. A third class of shares of each Fund, Investor
               Shares, are available to the general public. Because the expenses
               of each class may differ, the performance of each class is
               expected to differ. If you would like additional information,
               please call Janus Extended Services at 1-800-29JANUS.
 
               SIGNIFICANT SHAREHOLDERS
 
   
               As of January 20, 1999, the following shareholder owned more than
               25% of the Shares of Janus Government Money Market Fund:
    
 
   
<TABLE>
<CAPTION>
                                                                 Percentage
                Shareholder                      Address         Ownership
                -----------------------------------------------------------
                <S>                       <C>                    <C>
                Janus Twenty Fund         100 Fillmore Street,    61.13%
                                          Denver, CO 80206-4928
                -----------------------------------------------------------
</TABLE>
    
 
   
               As of January 20, 1999, the following shareholder owned more than
               25% of the Shares of Janus Tax-Exempt Money Market Fund:
    
 
   
<TABLE>
<CAPTION>
                                                                 Percentage
                Shareholder                      Address         Ownership
                -----------------------------------------------------------
                <S>                       <C>                    <C>
                Janus Capital             100 Fillmore Street,    84.67%
                  Corporation             Denver, CO 80206-4928
                -----------------------------------------------------------
</TABLE>
    
 
               Thus, these shareholders may have the power to control any vote
               of the Shares of these Funds.
 
 20 Janus Money Market Funds - Institutional Shares
<PAGE> 
 
               YEAR 2000
 
               Preparing for Year 2000 is a high priority for Janus Capital,
               which has established a dedicated group to address this issue.
               Janus Capital has devoted considerable internal resources and has
               engaged one of the foremost experts in the field to help achieve
               Year 2000 readiness. Janus Capital does not anticipate that Year
               2000-related issues will have a material impact on its ability to
               continue to provide the Funds with service at current levels;
               however, Janus Capital cannot make any assurances that the steps
               it has taken to ensure Year 2000 readiness will be successful. In
               addition, there can be no assurance that Year 2000 issues will
               not affect the companies in which the Funds invest or worldwide
               markets and economies.
 
                                                           Other Information  21
<PAGE> 
 
Janus Money Market Funds -
  Institutional Shares
<PAGE> 
 
                   Shareholder's
                   Guide
 
                   This section contains information
                   about opening your account with
                   Janus, purchases and redemptions,
                   and other services and options
                   available to shareholders.
 
                   You may visit our Web site at
                   janus.com for more information
                   about the Shares.
 
                                                    [JANUS LOGO]
<PAGE> 
 
HOW TO OPEN AN ACCOUNT
 
               ESTABLISHING YOUR ACCOUNT
 
               The Application enclosed with this Prospectus describes the
               options available to you as an institutional shareholder of the
               Funds. After reviewing the Application carefully, complete, sign
               and forward it to:
 
<TABLE>
                <S>                       <C>
                Via Regular Mail           Via Express Mail - Overnight Delivery
                Janus                      Janus
                P.O. Box 173375            100 Fillmore Street
                Denver, CO 80217-3375      Denver, CO 80206-4928
                Attn: Extended Services    Attn: Extended Services
</TABLE>
 
               Do not include any purchase money with the Application. All
               purchases of Shares should be effected by wire transfer. See
               "Purchasing Shares." The Funds reserve the right to suspend the
               offering of the Shares for a period of time and to reject any
               specific purchase request.
 
               You may set up your account for Investment Retirement Plan
               rollovers (in excess of $250,000) under a tax-sheltered
               retirement plan. A retirement plan allows you to shelter your
               investment income from current income taxes. A contribution to
               these plans may also be tax deductible. Distributions from a
               retirement plan are generally subject to income tax and may be
               subject to an additional tax if withdrawn prior to age 59 1/2.
 
               Please refer to the Janus IRA booklet for complete information
               regarding IRAs. You will need a special application to be
               enrolled in the plan. For an application and more details, call
               1-800-525-3713.
 
               TAXPAYER IDENTIFICATION NUMBERS
 
               On the application or other appropriate form, you will be asked
               to certify that your Social Security or taxpayer identification
               number is correct and that you are not subject to backup
               withholding for failing to report income to the IRS. If you are
 
 24 Janus Money Market Funds - Institutional Shares
<PAGE> 
 
               subject to the 31% backup withholding or you did not certify your
               taxpayer identification, the IRS requires the Funds to withhold
               31% of any dividends paid and redemption or exchange proceeds. In
               addition, to the 31% backup withholding, you may be subject to a
               $50 fee to reimburse the Funds for any penalty that the IRS may
               impose.
 
               DISTRIBUTION OPTIONS
 
               Shareholders have the option of having their dividends and
               distributions automatically reinvested in Shares of a Fund or
               wired to a predesignated bank account. If no election is made,
               all dividends and distributions will be reinvested in additional
               Shares.
 
PURCHASING SHARES
 
   
               You must establish a Fund account and receive an account number
               before making purchases by wire. Contact the Institutional
               Services Money Desk at 1-800-29JANUS for complete instructions.
               Purchase requests received before 3:00 p.m. for Janus Money
               Market Fund, (New York time) 5:00 p.m. for Janus Government Money
               Market Fund and 12:00 p.m. for Janus Tax-Exempt Money Market Fund
               on a bank business day will receive dividends declared on the
               purchase date (the daily yield for the Funds is calculated after
               these times). In addition, the Funds' transfer agent must receive
               payment in federal funds by 6:00 p.m. (New York time). If your
               payment on a purchase order is not received by this time, your
               purchase may be canceled. You will be responsible for any losses
               or expenses incurred by the Fund, Janus Capital, Janus Service
               Corporation or Janus Distributors, Inc., and the Fund can redeem
               shares you own in this or another identically registered Janus
               fund as reimbursement. The Funds and their agent have the right
               to reject or cancel any purchase, exchange, or redemption due to
               nonpayment. The Funds also reserve the right to require purchase
               requests and payments prior to these times on days when the bond
               market or the NYSE close early. Purchase orders received after
               these times will receive the dividend declared the following day.
    
 
                                                         Shareholder's guide  25
<PAGE> 
 
               Complete information regarding your account must be included in
               all wire instructions in order to facilitate prompt and accurate
               handling of investments. Please contact the Institutional
               Services Money Desk at 1-800-29JANUS when you intend to make a
               wire purchase. The Funds do not charge any fees for transactions
               by wire in Shares of the Funds.
 
               Once you have established a Fund account, you may purchase Shares
               for such account or open additional accounts with other Funds at
               any time. The Funds reserve the right to suspend the offering of
               Shares for a period of time and to reject any specific purchase
               request. If you have any questions, please call 1-800-29JANUS.
 
MINIMUM INVESTMENT
 
               JANUS MONEY MARKET FUND
 
               The minimum investment for the Institutional Shares of Janus
               Money Market Fund is $5,000,000. Shares may be purchased with an
               initial $250,000 investment, however, the $5,000,000 minimum must
               be reached within six months of opening the account. Shareholders
               who do not reach or maintain the $5,000,000 minimum will be given
               the option of (1) exchanging into Investor Shares of Janus Money
               Market Fund, Institutional Shares of Janus Government Money
               Market Fund or Janus Tax-Exempt Money Market Fund, or shares of
               another Janus fund or (2) having their shares redeemed.
               Shareholders' balances that fall below the required minimum will
               have 30 days to reach an account balance of $5,000,000.
 
               JANUS GOVERNMENT MONEY MARKET FUND AND JANUS TAX-EXEMPT MONEY
               MARKET FUND
 
               The minimum initial investment in these shares is $250,000. The
               Funds may, in their discretion, waive this minimum under certain
               circumstances but, in such event, the minimum must be reached
               within 90 days of opening the account. Shareholders who do not
               maintain the $250,000 minimum will be given the option of
 
 26 Janus Money Market Funds - Institutional Shares
<PAGE> 
 
               exchanging into Investor Shares or shares of another Janus fund
               or having their Shares redeemed.
 
NET ASSET VALUE
 
   
               The net asset value of the Shares is determined at the close of
               the regular trading session of the New York Stock Exchange
               (normally 4:00 p.m., New York time) each day that both the
               Exchange and the Federal Reserve Banks are open, except that
               Janus Government Money Market Fund's NAV is normally calculated
               at 5:00 p.m. (New York time) on such days. The NAV of Fund shares
               is not determined on the days the NYSE is closed (generally, New
               Year's Day, Martin Luther King Day, President's Day, Good Friday,
               Memorial Day, Independence Day, Labor Day, Thanksgiving and
               Christmas) and when the Federal Reserve Banks are closed
               (generally, the same days as the NYSE is closed and also Columbus
               Day and Veterans' Day). NAV per share is determined by dividing
               the total value of the securities and other assets, less
               liabilities, by the total number of Shares outstanding. Portfolio
               securities are valued at their amortized cost. Amortized cost
               valuation involves valuing an instrument at its cost and
               thereafter assuming a constant amortization to maturity (or such
               other date as permitted by Rule 2a-7) of any discount or premium.
               If fluctuating interest rates cause the market value of a
               portfolio to deviate more than 1/2 of 1% from the value
               determined on the basis of amortized cost, the Trustees will
               consider whether any action, such as adjusting the Share's NAV to
               reflect current market conditions, should be initiated to prevent
               any material dilutive effect on shareholders.
    
 
SHARE CERTIFICATES
 
               Share certificates are not available for the Shares in order to
               maintain the general liquidity that is representative of a money
               market fund and to help facilitate transactions in shareholder
               accounts.
 
                                                         Shareholder's guide  27
<PAGE> 
 
HOW TO EXCHANGE SHARES
 
               The Janus funds include several funds with a variety of
               investment objectives. You may exchange your Shares for shares of
               any other Janus fund that is available to the public and
               registered in your state of residence. There are certain
               procedures which should be followed to effect the transfer of the
               entire or partial balance in your Shares to one of the other
               Janus funds. The Funds reserve the right to reject any exchange
               request and to modify or terminate the exchange privilege at any
               time. For example, the Funds may reject exchanges from accounts
               engaged in excessive trading (including market timing
               transactions) that are detrimental to the Funds. If you would
               like more information regarding this option, please call
               Institutional Services at 1-800-29JANUS.
 
HOW TO REDEEM SHARES
 
               PARTIAL OR COMPLETE REDEMPTIONS
 
               You may redeem all or a portion of your Shares on any business
               day. Your Shares will be redeemed at the NAV next calculated
               after your Fund has received your redemption request in good
               order and meeting all the requirements of this Prospectus.
               Proceeds of such redemption generally will be wired to your
               predesignated bank account as of the day of redemption, or, if
               that day is a bank holiday, on the next bank business day.
 
               IN WRITING
 
               To redeem all or part of your Shares in writing, send a letter of
               instruction to the following address:
 
<TABLE>
                <S>                        <C>
                Via Regular Mail           Via Express Mail - Overnight Delivery
                Janus                      Janus
                P.O. Box 173375            100 Fillmore Street
                Denver, CO 80217-3375      Denver, CO 80206-4928
                Attn: Extended Services    Attn: Extended Services
</TABLE>
 
               The letter should be on company letterhead (in the case of
               institutional clients) and should specify the name of the Fund,
               the
 
 28 Janus Money Market Funds - Institutional Shares
<PAGE> 
 
               number of Shares or dollars being redeemed, the account number,
               appropriate wiring instructions, the name(s) on the account, your
               name and your daytime telephone number. The letter must be signed
               by an authorized person whose signature is on file with the Fund.
 
               For IRA shareholders, written instructions must be signed by the
               account owner. If you do not want federal income tax withheld
               from your redemption, you must state that you elect not to have
               such withholding apply. In addition, your instructions must state
               whether the distribution is normal (after age 59 1/2) or
               premature (before age 59 1/2) and, if premature, whether any
               exceptions apply with regard to the 10% additional tax on early
               distributions.
 
               BY TELEPHONE
 
   
               Shares may be redeemed by telephone. If a request for a
               redemption is received by 3:00 p.m. (New York time) for Janus
               Money Market Fund, 5:00 p.m. for Janus Government Money Market
               Fund and 12:00 p.m. for Janus Tax-Exempt Money Market Fund on a
               bank business day, Shares will be redeemed and the redemption
               amount wired in federal funds to the shareholder's predesignated
               bank account that day. After these times, a redemption request
               will be processed at that day's NAV and will include that day's
               dividends, but generally will not be wired until the next bank
               business day. The Funds reserve the right to require redemption
               requests prior to these times on days when the bond market or
               NYSE close early. There is no fee for redemptions by wire.
    
 
               BY A FUND
 
               Your account may be terminated by your Fund if, due to the
               transfer or redemption of Shares, the value of the remaining
               Shares in your account falls below the minimum investment
               required to open a new account, or if you engage in illegal or
               other conduct detrimental to the Funds. In the case of
               insufficient account size, your Fund will notify you that you
               have 30 days for Janus Money Market Fund or 60 days for Janus
               Government
 
                                                         Shareholder's guide  29
<PAGE> 
 
               Money Market Fund and Janus Tax-Exempt Money Market Fund to
               increase your account to the minimum required before redeeming
               your account.
 
SPECIAL SHAREHOLDER SERVICES AND OTHER INFORMATION
 
               PORTFOLIO INFORMATION
 
               You may call 1-800-29JANUS by TouchTone(TM) telephone for access
               to certain information regarding your account, including current
               yield and dividend rate information, Monday through Friday from
               7:00 a.m. to 10:00 p.m. (New York time).
 
               TELEPHONE INSTRUCTIONS
 
               You may initiate many transactions by telephone. The Funds and
               their agents will not be responsible for any losses resulting
               from unauthorized transactions when procedures designed to verify
               the identity of the caller are followed.
 
               ACCOUNT ADDRESS AND NAME CHANGES
 
               To change the address on your account, you may call 1-800-
               29JANUS or send a written request signed by all registered owners
               of your account. Please include the name of the Fund(s), the
               account number(s), the name(s) on the account and both the old
               and new addresses. Within the first 10 days of an address change,
               redemptions by institutional clients are permissible only if the
               redemption proceeds are wired to a pre-designated bank account or
               you provide the Funds with appropriate corporate resolutions
               changing wire instructions. Please call 1-800-29JANUS for
               additional information.
 
               To change the name on an account, the Shares must be transferred
               to a new account. Such a change generally requires written
               instructions with the guaranteed signatures of all registered
               owners, as well as an Application and supporting legal
               documentation, if applicable. Please call 1-800-29JANUS for
               additional information.
 
 30 Janus Money Market Funds - Institutional Shares
<PAGE> 
 
               STATEMENTS AND REPORTS
 
               Each shareholder will receive daily confirmations of purchases
               and redemptions made in the Funds. On the last day of each month,
               the shareholder will receive a statement reporting all purchases
               and redemptions made during that month, and dividends paid during
               the month.
 
   
               Twice each year you will receive the financial statements of the
               Funds, including a statement listing portfolio securities. To
               reduce expenses, only one copy of most reports (such as the
               Funds' Annual Report) may be mailed to all accounts with the same
               tax identification number. Please call 1-800-29JANUS if you need
               additional reports sent each time. The Funds reserve the right to
               charge a fee for additional statement and report requests.
    
 
               TEMPORARY SUSPENSION OF SERVICES
 
               The Funds or their agents may temporarily suspend telephone
               transactions and other shareholder services described in this
               Prospectus upon reasonable notice or to the extent that any
               circumstance reasonably beyond the control of the Funds or their
               agents materially hampers the provision of such services.
 
               TRANSACTIONS THROUGH PROCESSING ORGANIZATIONS
 
               You may purchase or sell Fund shares through a broker-dealer,
               bank or other financial institution, or an organization that
               provides recordkeeping and consulting services to retirement or
               other employee benefit plans (a "Processing Organization").
               Processing Organizations may charge you a fee for this service
               and may require different minimum initial and subsequent
               investments than the Funds. Processing Organizations may also
               impose other charges or restrictions different from those
               applicable to shareholders who invest in the Funds directly. A
               Processing Organization, rather than its customers, may be the
               shareholder of record of your shares. The Funds are not
               responsible for the failure of any Processing Organization to
               carry out its obligations to its customers. Janus Capital or its
               affiliates, from their own assets,
 
                                                         Shareholder's guide  31
<PAGE> 
 
   
               may compensate certain Processing Organizations for providing
               administrative, recordkeeping and similar services, as well as
               distribution-related services.
    
   
    
 
 32 Janus Money Market Funds - Institutional Shares
<PAGE> 
 
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                                                                              33
<PAGE> 
 
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 34
<PAGE> 
 
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                                                                              35
<PAGE> 
 
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 36
<PAGE> 
 
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<PAGE> 
 
[JANUS LOGO]
   
          1-800-29JANUS
    
          P.O. Box 173375
          Denver, Colorado 80217-3375
          janus.com
 
   
You can request other information, including a Statement of
Additional Information, Annual Report or Semiannual Report, free of
charge, by contacting Janus at 1-800-29JANUS or visiting our Web
site at janus.com. In the Funds' Annual Report you will find a
discussion of the market conditions and investment strategies that
significantly affected the Funds' performance during their last
fiscal year. Other information is also available from financial
intermediaries that sell shares of the Funds.
    
 
The Statement of Additional Information provides detailed
information about the Funds and is incorporated into this Prospectus
by reference. You may review the Funds' Statement of Additional
Information at the Public Reference Room of the SEC or get text only
copies for a fee, by writing to or calling the Public Reference
Room, Washington, D.C. 20549-6009 (1-800-SEC-0330). You may obtain
the Statement of Additional Information for free from the SEC's Web
site at http://www.sec.gov.
 
              Investment Company Act File No. 811-1879
 
  3168
<PAGE> 
                                                                    [JANUS LOGO]
 
                       Janus Money Market Funds
                       Service Shares
 
                                    PROSPECTUS
                                    FEBRUARY 17, 1999
                                    Janus Money Market Fund
                                    Janus Government Money Market Fund
                                    Janus Tax-Exempt Money Market Fund
 
                       Janus Money Market Fund, Janus Government Money Market
                       Fund, and Janus Tax-Exempt Money Market Fund are
                       designed for investors who seek maximum current income
                       consistent with stability of capital. This prospectus
                       offers a separate class of shares of each Fund
                       (collectively, the "Shares") exclusively through banks
                       and other financial institutions ("Financial
                       Institutions") in connection with trust accounts, cash
                       management programs and similar programs provided to
                       their customers. Each Fund is a separate series of
                       Janus Investment Fund, an open-end management
                       investment company.
 
                       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]
<PAGE> 
 
                                                             Table of contents
 
<TABLE>
                <S>                                               <C>
                RISK/RETURN SUMMARY
                   Janus Money Market Fund......................    2
                   Janus Government Money Market Fund...........    2
                   Janus Tax-Exempt Money Market Fund...........    2
                   Fees and expenses............................    5
                INVESTMENT OBJECTIVES, PRINCIPAL INVESTMENT
                STRATEGIES AND RISKS
                   Investment objectives and principal
                   investment strategies........................    6
                   Common investment policies...................    7
                   Types of investments.........................    7
                   Common investment techniques.................   10
                MANAGEMENT OF THE FUNDS
                   Investment adviser and administrator.........   13
                   Portfolio managers...........................   14
                   Assistant portfolio manager..................   15
                DISTRIBUTIONS AND TAXES............ ............   16
                FINANCIAL HIGHLIGHTS.............. .............   18
                OTHER INFORMATION............... ...............   21
                SHAREHOLDER'S GUIDE
                   Purchases....................................   26
                   Minimum investment...........................   27
                   Net asset value..............................   27
                   Redemptions..................................   28
                   Shareholder communications...................   29
 
</TABLE>
 
                                                            Table of contents  1
<PAGE> 
Risk return summary
 
1. WHAT ARE THE INVESTMENT OBJECTIVES OF THE MONEY MARKET FUNDS?
 
- --------------------------------------------------------------------------------
 
               - JANUS MONEY MARKET FUND AND JANUS GOVERNMENT MONEY MARKET
                 FUND seek maximum current income to the extent consistent
                 with stability of capital.
 
               - JANUS TAX-EXEMPT MONEY MARKET FUND seeks maximum current
                 income that is exempt from federal income taxes to the
                 extent consistent with stability of capital.
 
               The Funds' Trustees may change these objectives without a
               shareholder vote and the Funds will notify you of any changes
               that are material. If there is a material change in a Fund's
               objective or policies, you should consider whether that Fund
               remains an appropriate investment for you. There is no guarantee
               that any Fund will meet its objective.
 
2. WHAT ARE THE MAIN INVESTMENT STRATEGIES OF THE MONEY MARKET FUNDS?
 
               The Money Market Funds will invest only in high-quality, short-
               term money market instruments that present minimal credit risks,
               as determined by Janus Capital.
 
               JANUS MONEY MARKET FUND invests primarily in high quality debt
               obligations and obligations of financial institutions. Debt
               obligations may include commercial paper, notes and bonds, and
               variable amount master demand notes. Obligations of financial
               institutions include certificates of deposit and time deposits.
 
               JANUS GOVERNMENT MONEY MARKET FUND invests exclusively in
               obligations issued and/or guaranteed as to principal and interest
               by the United States government or by its agencies and
               instrumentalities and repurchase agreements secured by such
               obligations.
 
               JANUS TAX-EXEMPT MONEY MARKET FUND invests primarily in municipal
               securities whose interest is exempt from federal income taxes,
               including the federal alternative minimum tax. The Fund may
               invest up to 20% of its net assets in taxable securities and may
               invest without limit in cash and cash equivalents that may be
 
 2 Janus Money Market Funds - Service Shares
<PAGE> 
 
               federally taxable to the extent the portfolio manager cannot
               locate investment opportunities with desirable risk/reward
               characteristics.
 
3. WHAT ARE THE MAIN RISKS OF INVESTING IN THE MONEY MARKET FUNDS?
 
               The Funds' yields will vary as the short-term securities in their
               portfolios mature and the proceeds are reinvested in securities
               with different interest rates. Over time, the real value of a
               Fund's yield may be eroded by inflation. Although the Money
               Market Funds invest only in high-quality, short-term money market
               instruments, there is a risk that the value of the securities
               they hold will fall as a result of changes in interest rates, an
               issuer's actual or perceived credit-worthiness or an issuer's
               ability to meet its obligations.
 
               Economic, business, or political development or change affecting
               tax-exempt securities may affect Janus Tax-Exempt Money Market
               Fund's holdings similarly. This could result in increased
               variability of performance. Income from the Fund's investments
               may be taxable by your state or local government.
 
               An investment in the Money Market Funds is not a deposit of a
               bank and is not insured or guaranteed by the Federal Deposit
               Insurance Corporation or any other government agency. Although
               the Funds seek to preserve the value of your investment at $1.00
               per share, it is possible to lose money by investing in these
               Funds.
 
               The following information illustrates how Service Shares of each
               Money Market Fund's performance has varied over time. The bar
               charts depict the change in performance from year to year.
 
                                                          Risk return summary  3
<PAGE> 
 
                JANUS MONEY MARKET FUND - SERVICE SHARES

A BAR CHART showing Annual Total Returns for Janus Money Market Fund - Service
Shares from 1997 through 1998:
 
   
                Annual returns for periods ended 12/31

                                                      5.46%    5.40%
                                                      1997     1998

Each percentage is represented by a bar of proportionate size with the actual
total return printed above the bar.

                Best Quarter: 4th-1997 1.38%; Worst Quarter: 1st-1997 1.27%
    
 
                JANUS GOVERNMENT MONEY MARKET FUND - SERVICE SHARES

A BAR CHART showing Annual Total Returns for Janus Government Money Market Fund 
- - Service Shares:
   
                Annual returns for periods ended 12/31

                                                      5.33%    5.28%
                                                      1997     1998

Each percentage is represented by a bar of proportionate size with the actual 
total return printed above the bar.

                Best Quarter: 4th-1997 1.35%; Worst Quarter: 1st-1997 1.23%
    
 
                JANUS TAX-EXEMPT MONEY MARKET FUND - SERVICE SHARES

A BAR CHART showing Annual Total Returns for Janus Tax-Exempt Money Market Fund
- - Service Shares:
 
                Annual returns for periods ended 12/31

                                                      3.44%    3.41%
                                                      1997     1998 

Each percentage is represented by a bar of proportionate size with the actual
total return printed above the bar.

                Best Quarter: 2nd-1997 0.92%; Worst Quarter: 1st-1997 0.75%
   
               The 7-day yield on December 31, 1998 was 5.17% for Janus Money
               Market Fund - Service Shares; 4.90% for Janus Government Money
               Market Fund - Service Shares; and 3.66% for Janus Tax-Exempt
               Money Market Fund - Service Shares, respectively. For the Funds'
               current yields, call the Janus XpressLine(TM) at 1-888-979-7737.
    
 
               The Money Market Funds' past performance does not necessarily
               indicate how they will perform in the future.
 
 4 Janus Money Market Funds - Service Shares
<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 Funds.
 
               ANNUAL FUND OPERATING EXPENSES are paid out of a Fund'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 describes the fees and expenses that you may pay if
               you buy and hold Shares of the Funds. It is based upon gross
               expenses (without the effect of expense offset arrangements) for
               the fiscal year ended October 31, 1998.
    
 
<TABLE>
<CAPTION>
                                     Janus Money   Janus Government    Janus Tax-Exempt
            Service Shares           Market Fund   Money Market Fund   Money Market Fund
   <S>                               <C>           <C>                 <C>             
   Management Fee                       .20 %            .20 %               .20 %
   Other Expenses                       .40 %            .40 %               .40 %
   Total Annual Fund Operating
     Expenses Without Waivers*          .60 %            .60 %               .60 %
   Total Waivers                       (.20)%           (.20)%              (.20)%
   Total Annual Fund Operating
     Expenses With Waivers*             .40 %            .40 %               .40 %
</TABLE>
 
- --------------------------------------------------------------------------------
   
  * All expenses are stated both with and without contractual waivers by
    Janus Capital. Janus Capital has agreed to continue such waivers until
    at least the next annual renewal of the advisory agreements.
    
- --------------------------------------------------------------------------------
 
  EXAMPLE:
  THE FOLLOWING EXAMPLE IS BASED ON FUND EXPENSES WITHOUT WAIVERS.
  This example is intended to help you compare the cost of investing in the
  Funds with the cost of investing in other mutual funds. The example
  assumes that you invest $10,000 in each of the Funds 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 Funds' 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    5 Years    10 Years
                                             -----------------------------------------
   <S>                                       <C>        <C>        <C>        <C>     
   Janus Money Market Fund                     $61       $192       $335        $750
   Janus Government Money Market Fund          $61       $192       $335        $750
   Janus Tax-Exempt Money Market Fund          $61       $192       $335        $750
</TABLE>
 
                                                          Risk return summary  5
<PAGE> 
Investment objectives, principal 
           investment strategies 
           and risks
 
               This section takes a closer look at the investment objective of
               each of the Funds, their principal investment strategies and
               certain risks of investing in the Funds. Strategies and policies
               that are noted as "fundamental" cannot be changed without a
               shareholder vote.
 
               Money market funds are subject to certain specific SEC rule
               requirements. Among other things, the Funds are limited to
               investing in U.S. dollar-denominated instruments with a remaining
               maturity of 397 days or less (as calculated pursuant to Rule 2a-7
               under the 1940 Act).
 
INVESTMENT OBJECTIVES AND PRINCIPAL INVESTMENT STRATEGIES
 
               JANUS MONEY MARKET FUND
               Janus Money Market Fund seeks maximum current income to the
               extent consistent with stability of capital. It pursues its
               objective by investing primarily in high quality debt obligations
               and obligations of financial institutions. Debt obligations may
               include commercial paper, notes and bonds, and variable amount
               master demand notes. Obligations of financial institutions
               include certificates of deposit and time deposits.
 
               JANUS GOVERNMENT MONEY MARKET FUND
               Janus Government Money Market Fund seeks maximum current income
               to the extent consistent with stability of capital. It pursues
               its objective by investing exclusively in obligations issued
               and/or guaranteed as to principal and interest by the United
               States government or by its agencies and instrumentalities and
               repurchase agreements secured by such obligations.
 
               JANUS TAX-EXEMPT MONEY MARKET FUND
               Janus Tax-Exempt Money Market Fund seeks maximum current income
               that is exempt from federal income taxes to the extent consistent
               with stability of capital. It pursues it objective by investing
               primarily in municipal securities whose interest is exempt from
               federal income taxes, including the federal alternative
 
 6 Janus Money Market Funds - Service Shares
<PAGE> 
 
               minimum tax. The Fund may invest up to 20% of its net assets in
               taxable securities and may invest without limit in cash and cash
               equivalents to the extent the portfolio manager cannot locate
               investment opportunities with desirable risk/reward
               characteristics.
 
               COMMON INVESTMENT POLICIES
 
               Each of the Money Market Funds will:
 
               - invest in high quality, short-term money market instruments
                 that present minimal credit risks, as determined by Janus
                 Capital
 
               - invest only in U.S. dollar-denominated instruments that have a
                 remaining maturity of 397 days or less (as calculated pursuant
                 to Rule 2a-7 under the 1940 Act)
 
               - maintain a dollar-weighted average portfolio maturity of 90
                 days or less
 
               TYPES OF INVESTMENTS
 
               JANUS MONEY MARKET FUND
 
               Janus Money Market Fund invests primarily in:
 
               - high quality debt obligations
 
               - obligations of financial institutions
 
               This Fund may also invest (to a lesser degree) in:
 
               - U.S. Government Securities (securities issued or guaranteed by
                 the U.S. government, its agencies and instrumentalities)
 
               - municipal securities
 
               DEBT OBLIGATIONS
               The Fund may invest in debt obligations of domestic issuers. Debt
               obligations include:
 
               - commercial paper
 
               - notes and bonds
 
             Investment objectives, principal investment strategies and risks  7
<PAGE> 
 
               - variable amount master demand notes (the payment obligations on
                 these instruments may be backed by securities, swap agreements
                 or other assets, by a guarantee of a third party or solely by
                 the unsecured promise of the issuer to make payments when due)
 
               - privately issued commercial paper or other securities that are
                 restricted as to disposition under the federal securities laws
 
               OBLIGATIONS OF FINANCIAL INSTITUTIONS
               Examples of obligations of financial institutions include:
 
               - negotiable certificates of deposit, bankers' acceptances, time
                 deposits and other obligations of U.S. banks (including savings
                 and loan associations) having total assets in excess of one
                 billion dollars and U.S. branches of foreign banks having total
                 assets in excess of ten billion dollars
 
               - Eurodollar and Yankee bank obligations (Eurodollar bank
                 obligations are dollar-denominated certificates of deposit or
                 time deposits issued outside the U.S. capital markets by
                 foreign branches of U.S. banks and by foreign banks. Yankee
                 bank obligations are dollar-denominated obligations issued in
                 the U.S. capital markets by foreign banks)
 
               - other U.S. dollar-denominated obligations of foreign banks
                 having total assets in excess of ten billion dollars that Janus
                 Capital believes are of an investment quality comparable to
                 obligations of U.S. banks in which the Fund may invest
 
               Foreign, Eurodollar (and to a limited extent, Yankee) bank
               obligations are subject to certain sovereign risks. One such risk
               is the possibility that a foreign government might prevent
               dollar-denominated funds from flowing across its borders. Other
               risks include: adverse political and economic developments in a
               foreign country; the extent and quality of government regulation
               of financial markets and institutions; the imposition of foreign
               withholding taxes; and expropriation or nationalization of
               foreign issuers.
 
 8 Janus Money Market Funds - Service Shares
<PAGE> 
 
               JANUS GOVERNMENT MONEY MARKET FUND
 
               Janus Government Money Market Fund invests exclusively in:
 
               - U.S. Government Securities
 
               - repurchase agreements secured by such obligations
 
               JANUS TAX-EXEMPT MONEY MARKET FUND
 
               Janus Tax-Exempt Money Market Fund invests primarily in municipal
               securities whose interest is exempt from federal income taxes,
               including the federal alternative minimum tax. However, this Fund
               reserves the right to invest:
 
               - up to 20% of its net assets in securities whose interest is
                 federally taxable
 
               - without limit in cash and cash equivalents, including
                 obligations that may be federally taxable (when its portfolio
                 manager is unable to locate investment opportunities with
                 desirable risk/reward characteristics)
 
               MUNICIPAL SECURITIES
               Municipal securities include:
 
               - municipal notes
 
               - short-term municipal bonds
 
               - participation interests in municipal securities
 
               At times, the Fund may invest more than 25% of its total assets
               in tax-exempt securities that are related in such a way that an
               economic, business, or political development or change affecting
               one such security could similarly affect the other securities.
               Examples include securities whose issuers are located in the same
               state, or securities whose interest is derived from revenues of
               similar type projects. The Fund may also invest more than 25% of
               its assets in industrial development bonds or participation
               interests therein.
 
             Investment objectives, principal investment strategies and risks  9
<PAGE> 
 
               Yields on municipal securities are dependent on a variety of
               factors, including general market conditions, the size of a
               particular offering, the maturity of the obligation and the
               rating of the issue. Municipal securities investments may lose
               money if the municipal securities issuer does not pay principal
               and interest when due. Bankruptcy, insolvency and other laws
               affecting the rights and remedies of creditors may affect the
               issuer's ability to pay.
 
               MUNICIPAL LEASES
               The Fund may invest in municipal leases or participation
               interests therein. The issuing municipality's credit will not
               necessarily back a lease obligation. Interest on lease
               obligations may become taxable if the lease is assigned. The Fund
               may incur losses if the issuer does not appropriate funds for the
               lease payment on an annual basis.
 
               TAXABLE INVESTMENTS
               As discussed above, although the Fund will attempt to invest
               substantially all of its assets in municipal securities whose
               interest is exempt from federal income tax, the Fund may under
               certain circumstances invest in certain securities whose interest
               is subject to such taxation, as described under Janus Money
               Market Fund's investments.
 
               COMMON INVESTMENT TECHNIQUES
 
               The following is a description of other investment techniques
               that the Money Market Funds may use:
 
               PARTICIPATION INTERESTS
               A participation interest gives a Money Market Fund a
               proportionate, undivided interest in underlying debt securities
               and usually carries a demand feature.
 
               DEMAND FEATURES
               Demand features give the Money Market Funds the right to resell
               securities at specified periods prior to their maturity dates.
 
 10 Janus Money Market Funds - Service Shares
<PAGE> 
 
               Demand features may shorten the life of a variable or floating
               rate security, enhance the instrument's credit quality and
               provide a source of liquidity.
 
               Demand features are often issued by third party financial
               institutions, generally domestic and foreign banks. Accordingly,
               the credit quality and liquidity of the Money Market Funds'
               investments may be dependent in part on the credit quality of the
               banks supporting the Money Market Funds' investments. This will
               result in exposure to risks pertaining to the banking industry,
               including the foreign banking industry. Brokerage firms and
               insurance companies also provide certain liquidity and credit
               support. A substantial portion of the Janus Tax-Exempt Money
               Market Fund's portfolio in particular may consist of securities
               backed by banks and other financial institutions, and thus
               adverse changes in the credit quality of these institutions could
               cause losses to the Fund and affect its share price.
 
               VARIABLE AND FLOATING RATE SECURITIES
               The Money Market Funds may invest in securities which have
               variable or floating rates of interest. These securities pay
               interest at rates that are adjusted periodically according to a
               specified formula, usually with reference to an interest rate
               index or market interest rate. Variable and floating rate
               securities are subject to changes in value based on changes in
               market interest rates or changes in the issuer's or guarantor's
               creditworthiness.
 
               MORTGAGE- AND ASSET-BACKED SECURITIES
               The Money Market Funds may purchase fixed or variable rate
               mortgage-backed securities issued by the Government National
               Mortgage Association, Federal National Mortgage Association, the
               Federal Home Loan Mortgage Corporation, or other governmental or
               other government-related entity. Janus Money Market Fund and
               Janus Tax-Exempt Money Market Fund may purchase other mortgage-
               and asset-backed securities including securities backed by
               automobile loans, equipment leases or credit card receivables.
 
            Investment objectives, principal investment strategies and risks  11
<PAGE> 
 
               Unlike traditional debt instruments, payments on these securities
               include both interest and a partial payment of principal.
               Prepayments of the principal of underlying loans may shorten the
               effective maturities of these securities and may result in a Fund
               having to reinvest proceeds at a lower interest rate.
 
               REPURCHASE AGREEMENTS
               Each Money Market Fund may enter into a collateralized repurchase
               agreements. Repurchase agreements are transactions in which a
               Fund purchases securities and simultaneously commits to resell
               those securities to the seller at an agreed-upon price on an
               agreed-upon future date. The repurchase price reflects a market
               rate of interest and is collateralized by cash or securities.
 
               If the seller of the securities underlying a repurchase agreement
               fails to pay the agreed resale price on the agreed delivery date,
               a Money Market Fund may incur costs in disposing of the
               collateral and may experience losses if there is any delay in its
               ability to do so.
 
 12 Janus Money Market Funds - Service Shares
<PAGE> 
                                                         Management of the funds
 
INVESTMENT ADVISER AND ADMINISTRATOR
 
               Each Fund has a separate Investment Advisory Agreement with Janus
               Capital, 100 Fillmore Street, Denver, Colorado 80206-4923. Janus
               Capital has served as investment adviser to Janus Fund since 1970
               and currently serves as investment adviser to all of the Janus
               funds, acts as sub-adviser for a number of private-label mutual
               funds and provides separate account advisory services for
               institutional accounts.
 
   
               Pursuant to the Investment Advisory Agreements, Janus Capital
               furnishes continuous advice and recommendations concerning each
               Fund's investments. Each of the Funds has agreed to compensate
               Janus Capital for its advisory services by the monthly payment of
               a fee at the annual rate of 0.20% of the value of the average
               daily net assets of each Fund. However, Janus Capital has agreed
               to waive a portion of its fee and accordingly, the advisory fee
               of each Fund will be calculated at the annual rate of 0.10% of
               the value of each Fund's average daily net assets. Janus Capital
               has agreed to continue such waivers until at least the next
               annual renewal of the advisory agreements. You will be notified
               of any change in this limit.
    
 
               The Funds have entered into an Administrative Agreement with
               Janus Capital where Janus Capital is compensated for providing
               administrative, compliance and accounting services including
               custody and transfer agency services. Janus Capital may use all
               or a portion of its administrative fee to compensate Financial
               Institutions for providing administrative services to their
               customers who invest in the Shares. The types of services that
               the Financial Institutions would provide include serving as the
               sole shareholder of record, shareholder recordkeeping, processing
               and aggregating purchase and redemption transactions, providing
               periodic statements, forwarding shareholder reports and other
               materials, providing tax information, and providing similar
               services that the Funds would have to perform if they were
               dealing directly with the beneficial owners, rather than the
               Financial Institutions, as shareholders of record.
 
                                                     Management of the funds  13
<PAGE> 
 
               The Glass-Steagall Act prohibits a depository institution (such
               as a commercial bank or savings and loan association) from being
               an underwriter or distributor of most securities. In the event
               the Glass-Steagall Act is deemed to prohibit depository
               institutions from acting in the administrative capacities
               described above or should Congress relax current restriction on
               depository institutions, the Trustees will consider appropriate
               changes in the services.
 
PORTFOLIO MANAGERS
 
   
SHARON S. PICHLER
    
- --------------------------------------------------------------------------------
   
                   is Executive Vice President of Janus Money Market Fund,
                   Janus Government Money Market Fund and Janus Tax-Exempt
                   Money Market Fund. She is portfolio manager of Janus Money
                   Market Fund and Janus Tax-Exempt Money Market Fund, which
                   she has managed since inception. She previously served as
                   portfolio manager of Janus Government Money Market Fund
                   from inception to February 1999. She holds a Bachelor of
                   Arts in Economics from Michigan State University and a
                   Master of Business Administration from the University of
                   Texas at San Antonio. Ms. Pichler received the Chartered
                   Financial Analyst designation.
    
 
   
J. ERIC THORDERSON
    
- --------------------------------------------------------------------------------
   
                   is portfolio manager of Janus Government Money Market Fund
                   which he has managed since February 1999. Prior to
                   assuming management of the Fund, he served as assistant
                   portfolio manager of Janus Money Market Fund, Janus
                   Government Money Market Fund and Janus Tax-Exempt Money
                   Market Fund. He joined Janus Capital in May 1996 as a
                   senior fixed income analyst. Prior to joining Janus
                   Capital, he was a portfolio manager for USAA Investment
                   Management Company from 1991 to 1996. He holds a Bachelor
                   of Arts in Business Administration from Wayne State
                   University and a Master's Degree in Business
                   Administration from the University of Illinois. Mr.
                   Thorderson received the Chartered Financial Analyst
                   designation.
    
 
 14 Janus Money Market Funds - Service Shares
<PAGE> 
 
ASSISTANT PORTFOLIO MANAGER
 
   
JEANINE M. MORRONI
    
- --------------------------------------------------------------------------------
   
                   is assistant portfolio manager of Janus Government Money
                   Market Fund. Ms. Morroni joined Janus Capital in January
                   1994 as a Fund Accountant and began trading short-term
                   securities in July 1994. She has been a credit analyst for
                   the Money Market Funds since 1996. Prior to joining Janus
                   Capital, she worked as a Fund Accountant at Oppenheimer
                   Management Corporation. She holds a Bachelor of Science in
                   Accounting from Colorado State University. She is a
                   candidate for the Chartered Financial Analyst designation.
    
 
                                                     Management of the funds  15
<PAGE> 
Distributions and taxes
 
               Dividends representing substantially all of the net investment
               income and any net realized gains on sales of securities are
               declared daily, Saturdays, Sundays and holidays included, and
               distributed on the last business day of each month. If a month
               begins on a Saturday, Sunday or holiday, dividends for those days
               are declared at the end of the preceding month and distributed on
               the first business day of the month. Distributions will be
               reinvested in Shares of a Fund unless otherwise elected by the
               shareholder pursuant to the options offered by the Financial
               Institution.
 
               Distributions for all of the Funds (except Janus Tax-Exempt Money
               Market Fund) are taxable income and are subject to federal income
               tax (except for shareholders exempt from income tax), whether
               such distributions are received in cash or are reinvested in
               additional Shares. Full information regarding the tax status of
               income dividends and any capital gains distributions will be
               mailed to Financial Institutions who will forward the information
               to their customers for tax purposes on or before January 31st of
               each year. Because the Funds are money market funds, they do not
               anticipate making any capital gains distributions.
 
               Janus Tax-Exempt Money Market Fund anticipates that substantially
               all income dividends it pays will be exempt from federal income
               tax. However, dividends attributable to interest on taxable
               investments, together with distributions from any net realized
               capital gains, are taxable. In addition, interest on certain
               private activity bonds is a preference item for purposes of the
               individual and corporate alternative minimum taxes. To the extent
               that the Fund earns such income, shareholders who are subject to
               the alternative minimum tax must include such income as a
               preference item. The Fund will advise shareholders of the
               percentage of dividends, if any, subject to the alternative
               minimum tax.
 
               Dividends and capital gains distributions may also be subject to
               state and local taxes. In certain states some portion of
               dividends and distributions (depending on the sources of the
               Fund's net income) of Janus Tax-Exempt Money Market Fund may be
               exempt
 
 16 Janus Money Market Funds - Service Shares
<PAGE> 
 
   
               from state and local taxes. Shareholders should consult their own
               tax adviser regarding exemption from any applicable state and
               local tax, as well as the tax treatment of any dividends or
               distributions from the Shares.
    
 
               The Funds intend to comply with provisions of the Internal
               Revenue Code applicable to investment companies, and thus it is
               not expected that any of the Funds will be required to pay any
               federal income or excise taxes. The SAI further explains the
               Funds' tax status.
 
                                                     Distributions and taxes  17
<PAGE> 
Financial highlights
 
   
               The financial highlights table is intended to help you understand
               the Funds' financial performance of the Funds' Shares through
               October 31st of each fiscal period shown. Items 1 through 8
               reflect financial results for a single Fund share. The total
               returns in the table represent the rate that an investor would
               have earned (or lost) on an investment in the Shares of each of
               the Funds, (assuming the reinvestment of all dividends and
               distributions). This information has been audited by
               PricewaterhouseCoopers LLP, whose report, along with the Funds'
               financial statements, are included in the Annual Report, which is
               available upon request, and incorporated by reference into the
               SAI.
    
 
   
<TABLE>
<CAPTION>
                        JANUS MONEY MARKET FUND - SERVICE SHARES
- ----------------------------------------------------------------------------------------
                                                            Periods ending October 31st
                                                              1998              1997(1)
<S>                                                         <C>                <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD                      $1.00              $1.00
    INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                                      0.05               0.05
  3. Net gains or (losses) on securities (both realized
     and unrealized)                                              --                 --
  4. Total from investment operations                           0.05               0.05
    LESS DIVIDENDS AND DISTRIBUTIONS:
  5. Dividends (from net investment income)                   (0.05)             (0.05)
  6. Distributions (from capital gains)                           --                 --
  7. Total dividends and distributions                        (0.05)             (0.05)
  8. NET ASSET VALUE, END OF PERIOD                            $1.00              $1.00
  9. Total return*                                             5.45%              5.14%
 10. Net assets, end of period (in thousands)                $42,520            $10,341
 11. Average net assets for the period (in thousands)        $29,322               $913
 12. Ratio of expenses to average net assets**                 0.40%(2)           0.40%(2)
 13. Ratio of net investment income to average net
     assets**                                                  5.30%              5.02%
- ----------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Period from November 22, 1996 (inception of Shares) to October 31, 1997.
(2) The ratio was .60% before waiver.
  * Total return is not annualized for periods of less than one full year.
 ** Annualized for periods of less than one full year.
 
 18 Janus Money Market Funds - Service Shares
<PAGE> 
 
   
<TABLE>
<CAPTION>
                 JANUS GOVERNMENT MONEY MARKET FUND - SERVICE SHARES
- --------------------------------------------------------------------------------------
                                                           Periods ending October 31st
                                                            1998               1997(1)
<S>                                                        <C>                 <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD                   $1.00               $1.00
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                                   0.05                0.05
  3. Net gains or (losses) on securities (both realized
     and unrealized)                                           --                  --
  4. Total from investment operations                        0.05                0.05
     LESS DIVIDENDS AND DISTRIBUTIONS:
  5. Dividends (from net investment income)                (0.05)              (0.05)
  6. Distributions (from capital gains)                        --                  --
  7. Total dividends and distributions                     (0.05)              (0.05)
  8. NET ASSET VALUE, END OF PERIOD                         $1.00               $1.00
  9. Total return*                                          5.33%               5.01%
 10. Net assets, end of period (in thousands)              $2,770                $628
 11. Average net assets for the period (in thousands)        $639              $1,141
 12. Ratio of expenses to average net assets**              0.40%(2)            0.40%(2)
 13. Ratio of net investment income to average net
     assets**                                               5.15%               5.23%
- --------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Period from November 22, 1996 (inception of Shares) to October 31, 1997.
   
(2) The ratio was .60% before waiver.
    
  * Total return is not annualized for periods of less than one full year.
 ** Annualized for periods of less than one full year.
 
                                                        Financial highlights  19
<PAGE> 
 
   
<TABLE>
<CAPTION>
                 JANUS TAX-EXEMPT MONEY MARKET FUND - SERVICE SHARES
- --------------------------------------------------------------------------------------
                                                          Periods ending October 31st
                                                           1998                1997(1)
<S>                                                      <C>                   <C>
  1. NET ASSET VALUE, BEGINNING OF PERIOD                  $1.00                $1.00
     INCOME FROM INVESTMENT OPERATIONS:
  2. Net investment income                                  0.03                 0.03
  3. Net gains or (losses) on securities (both realized
     and unrealized)                                          --                   --
  4. Total from investment operations                       0.03                 0.03
     LESS DIVIDENDS AND DISTRIBUTIONS:
  5. Dividends (from net investment income)               (0.03)               (0.03)
  6. Distributions (from capital gains)                       --                   --
  7. Total dividends and distributions                    (0.03)               (0.03)
  8. NET ASSET VALUE, END OF PERIOD                        $1.00                $1.00
  9. Total return*                                         3.44%                3.22%
 10. Net assets, end of period (in thousands)            $17,696                  $10
 11. Average net assets for the period (in thousands)     $3,215                  $10
 12. Ratio of expenses to average net assets**             0.40%(2)             0.40%(2)
 13. Ratio of net investment income to average net
     assets**                                              3.32%                3.17%
- --------------------------------------------------------------------------------------
</TABLE>
    
 
(1) Period from November 22, 1996 (inception of Shares) to October 31, 1997.
   
(2) The ratio was .60% before waiver.
    
  * Total return is not annualized for periods of less than one full year.
 ** Annualized for periods of less than one full year.
 
 20 Janus Money Market Funds - Service Shares
<PAGE> 
                                                               Other information
 
               CLASSES OF SHARES
 
               Each Fund currently offers three classes of shares by separate
               prospectuses. The Shares offered by this Prospectus are available
               only to banks and other Financial Institutions that meet minimum
               investment requirements in connection with trust accounts, cash
               management programs and similar programs. A second class of
               shares, Institutional Shares of each Fund, are available only to
               institutional clients, including corporations, foundations and
               trusts, and individuals meeting certain minimum investment
               requirements. A third class of shares, Investor Shares of each
               Fund, are available to the general public. Because the expenses
               of each class may differ, the performance of each class is
               expected to differ. If you would like additional information,
               please call 1-800-29JANUS.
 
               SIGNIFICANT SHAREHOLDERS
 
   
               As of January 20, 1999, the following shareholder owned more than
               25% of the Shares of Janus Money Market Fund:
    
   
<TABLE>
<CAPTION>
                                                                    Percentage
           Shareholder                         Address              Ownership
- -------------------------------------------------------------------------------
<S>                                 <C>                             <C>
Norwest Investment Services, Inc.   608 2nd Avenue, South             89.46%
                                    Minneapolis, MN 55402-1916
</TABLE>
    
 
   
               As of January 20, 1999, the following shareholder owned more than
               25% of the Shares of Janus Government Money Market Fund:
    
   
<TABLE>
<CAPTION>
                                                                    Percentage
           Shareholder                         Address              Ownership
- -------------------------------------------------------------------------------
<S>                                 <C>                             <C>
EGAP & Co. Chittenden Trust Co.     P.O. Box 820                      98.71%
                                    Burlington, VT 05402-0820
 
</TABLE>
    
 
                                                           Other information  21
<PAGE> 
 
   
               As of January 20, 1999, the following shareholder owned more than
               25% of the Shares of Janus Tax-Exempt Money Market Fund:
    
   
<TABLE>
<CAPTION>
                                                                    Percentage
           Shareholder                         Address              Ownership
- -------------------------------------------------------------------------------
<S>                                 <C>                             <C>       
Norwest Investment Services, Inc.   608 2nd Avenue, South             99.18%
                                    Minneapolis, MN 55402-1916
- -------------------------------------------------------------------------------
</TABLE>
    
 
   
               Thus, these shareholders may have the power to control any vote
               of the Shares of these Funds.
    
 
               YEAR 2000
 
               Preparing for Year 2000 is a high priority for Janus Capital,
               which has established a dedicated group to address this issue.
               Janus Capital has devoted considerable internal resources and has
               engaged one of the foremost experts in the field to help achieve
               Year 2000 readiness. Janus Capital does not anticipate that Year
               2000-related issues will have a material impact on its ability to
               continue to provide the Funds with service at current levels;
               however, Janus Capital cannot make any assurances that the steps
               it has taken to ensure Year 2000 readiness will be successful. In
               addition, there can be no assurance that Year 2000 issues will
               not affect the companies in which the Funds invest or worldwide
               markets and economies.
 
 22 Janus Money Market Funds - Service Shares
<PAGE> 
 
                       This page intentionally left blank
 
                                                                              23
<PAGE> 
 
Janus Money Market Funds 
      Service Shares
<PAGE> 
 
                   Shareholder's
                   Guide
 
                   Investors may not purchase or
                   redeem shares of the Funds
                   directly. Shares may be purchased
                   or redeemed only through Financial
                   Institutions in connection with
                   trust accounts, Cash management
                   programs and similar programs.
                   Your Financial Institution will
                   provide you with instructions on
                   purchasing or redeeming shares.
 
                                                    [JANUS LOGO]
<PAGE> 
 
               The Financial Institutions are responsible for promptly
               transmitting purchase, redemption and other requests to the Funds
               under the arrangements made between the Financial Institutions
               and their customers. The Funds are not responsible for the
               failure of any Financial Institution to carry out its obligations
               to its customers.
 
PURCHASES
 
   
               Purchases of Fund Shares may be made only through omnibus
               accounts of Financial Institutions in connection with trust
               accounts, cash management programs and similar programs. Your
               Financial Institution will provide you with instructions on
               purchasing Shares. The following information applies to purchase
               orders from Financial Institutions to Janus (Check with your
               Financial Institution directly for deadlines for purchase orders
               from you to your Financial Institution). Requests to purchase
               received from a Financial Institution before 3:00 p.m. (New York
               time) for Janus Money Market Fund, 5:00 p.m., for Janus
               Government Money Market Fund, and 12:00 p.m. for Janus Tax-
               Exempt Money Market Fund on a bank business day (a day when both
               the New York Stock Exchange ("NYSE") and the Federal Reserve
               Banks are open) will receive dividends declared on the purchase
               date. In addition, the Funds' transfer agent must receive payment
               from the Financial Institution in federal funds by 6:00 p.m. (New
               York time). The Funds also reserve the right to require purchase
               requests and payments from the Financial Institution prior to
               these times on days when the bond market or NYSE close early.
               Purchase orders received after these times will receive the
               dividend declared the following day.
    
 
               The Financial Institutions may impose charges and restrictions
               different from those imposed by the Funds. The Financial
               Institutions may also require different minimum initial and
               subsequent investments than required by the Funds.
 
               Each Fund 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 Fund. Any Fund may discontinue sales of its Shares if
               management believes
 
 26 Janus Money Market Funds - Service Shares
<PAGE> 
 
               that a substantial further increase may adversely affect that
               Fund's ability to achieve its investment objective. In such
               event, however, it is anticipated that existing Financial
               Institution customers in that Fund would be permitted to continue
               to authorize investment in such Fund and to reinvest any
               dividends or capital gains distributions.
 
MINIMUM INVESTMENT
 
               There is a $250,000 initial aggregate investment minimum by each
               Financial Institution. The Funds may, in their discretion, waive
               this minimum under certain circumstances but, in such event, the
               minimum must be reached within 90 days of opening the account.
               Financial Institutions who do not maintain the $250,000 minimum
               will be given the option of requesting their customers to
               exchange into Investor Shares if the required minimum investment
               for Investor Shares is met or having their customers' Shares
               redeemed.
 
NET ASSET VALUE
 
   
               The net asset value of the Shares is determined at the close of
               the regular trading session of the NYSE (normally 4:00 p.m., New
               York time) each day that both the NYSE and the New York Federal
               Reserve Bank are open (bank business day), except that Janus
               Government Money Market Fund's NAV is normally calculated at 5:00
               p.m. (New York time) on such days. The NAV of Fund shares is not
               determined on days the NYSE is closed (generally, New Year's Day,
               Martin Luther King Day, Presidents' Day, Good Friday, Memorial
               Day, Independence Day, Labor Day, Thanksgiving and Christmas) and
               when the Federal Reserve Banks are closed (generally, the same
               days as the NYSE is closed and also Columbus Day and Veterans'
               Day). NAV per share is determined by dividing the total value of
               the securities and other assets, less liabilities, by the total
               number of Shares outstanding. Portfolio securities are valued at
               their amortized cost. Amortized cost valuation involves valuing
               an instrument at its cost and thereafter assuming a constant
               amortization to maturity (or such other date as permitted by Rule
               2a-7) of any discount or
    
 
                                                         Shareholder's guide  27
<PAGE> 
 
               premium. If fluctuating interest rates cause the market value of
               a portfolio to deviate more than 1/2 of 1% from the value
               determined on the basis of amortized cost, the Trustees will
               consider whether any action, such as adjusting the Share's NAV to
               reflect current market conditions, should be initiated to prevent
               any material dilutive effect on shareholders.
 
SHARE CERTIFICATES
 
               Share certificates are not available for the Shares in order to
               maintain the general liquidity that is representative of a money
               market fund and to help facilitate transactions in shareholder
               accounts.
 
REDEMPTIONS
 
   
               Redemptions, like purchases, may be effected only through the
               accounts of participating Financial Institutions. Your Financial
               Institution will provide you with instructions on redeeming
               shares. The following information applies to redemption orders
               from Financial Institutions to Janus (Check with your Financial
               Institution directly for deadlines for redemption orders from you
               to your Financial Institution). If a request for a redemption is
               received from a Financial Institution by 3:00 p.m. (New York
               time) for Janus Money Market Fund, 5:00 p.m. for Janus Government
               Money Market Fund and 12:00 p.m. for Janus Tax-Exempt Money
               Market Fund on a bank business day, Shares will be redeemed and
               the redemption amount wired in federal funds to the Financial
               Institution's omnibus account that day. After these times, a
               redemption request will be processed at that day's NAV and will
               include that day's dividends, but generally will not be wired
               until the next bank business day. The Funds reserve the right to
               require redemption requests prior to these times on days when the
               bond market or NYSE close early.
    
   
    
 
 28 Janus Money Market Funds - Service Shares
<PAGE> 
 
SHAREHOLDER COMMUNICATIONS
 
   
               Shareholders will receive annual and semiannual reports including
               the financial statements of the Funds that they have authorized
               for investment from their Financial Institution. Each report will
               show the investments owned by each Fund and the market values
               thereof, as well as other information about the Funds and their
               operations. The Trust's fiscal year ends October 31. The Funds
               reserve the right to charge a fee for additional statement and
               report requests.
    
 
                                                         Shareholder's guide  29
<PAGE> 
 
[JANUS LOGO]
   
          1-800-29JANUS
    
          P.O. Box 173375
          Denver, Colorado 80217-3375
          janus.com
 
   
You can request other information, including a Statement of
Additional Information, Annual Report or Semiannual Report, free of
charge, by contacting Janus at 1-800-29JANUS or visiting our Web
site at janus.com. In the Funds' Annual Report, you will find a
discussion of the market conditions and investment strategies that
significantly affected the Funds' performance during their last
fiscal year. Other information is also available from financial
intermediaries that sell shares of the Funds.
    
 
The Statement of Additional Information provides detailed
information about the Funds and is incorporated into this Prospectus
by reference. You may review the Funds' Statement of Additional
Information at the Public Reference Room of the SEC or get text only
copies for a fee, by writing to or calling the Public Reference
Room, Washington, D.C. 20549-6009 (1-800-SEC-0330). You may obtain
the Statement of Additional Information for free from the SEC's Web
site at http://www.sec.gov.
 
              Investment Company Act File No. 811-1879
 
  3169
<PAGE> 
                                  [JANUS LOGO]

                    Janus Investment Fund
 
                    Domestic Growth Funds
                     Janus Fund                         Janus Enterprise Fund
                     Janus Mercury Fund                    Janus Olympus Fund
                     Janus Special Situations Fund          Janus Twenty Fund
 
                    Global Growth Funds
                     Janus Global Life Sciences Fund     Janus Worldwide Fund
                     Janus Global Technology Fund
 
                    Combination Funds
                     Janus Balanced Fund         Janus Growth and Income Fund
                     Janus Equity Income Fund
 
                    Fixed-Income Funds
                     Janus Flexible Income Fund         Janus High-Yield Fund
                     Janus Federal Tax-Exempt Fund      Janus Short-Term Bond
                     Fund
 
                    100 Fillmore Street
                    Denver, CO 80206-4928
                    (800) 525-3713
 
                    Statement of Additional Information
 
                    February 17, 1999
 
                    This Statement of Additional Information pertains to the
                    Funds listed above, each of which is a separate series of
                    Janus Investment Fund, a Massachusetts business trust.
 
                    This SAI is not a Prospectus and should be read in
                    conjunction with the Funds' Prospectuses dated February
                    17, 1999, which are incorporated by reference into this
                    SAI and may be obtained from the Trust at the above phone
                    number or address. This SAI contains additional and more
                    detailed information about the Funds' operations and
                    activities than the Prospectuses. The Annual Reports,
                    which contain important financial information about the
                    Funds, are incorporated by reference into this SAI and
                    are also available, without charge, at the above phone
                    number or address.
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[JANUS LOGO]

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                                                               Table of contents
 
<TABLE>
                <S>                                               <C>
                Classification, Portfolio Turnover,
                Investment Policies and Restrictions,
                and Investment Strategies and Risks.............    2
                Investment Adviser..............................   40
                Custodian, Transfer Agent
                and Certain Affiliations........................   46
                Portfolio Transactions and Brokerage............   48
                Trustees and Officers...........................   55
                Purchase of Shares..............................   64
                   Net Asset Value Determination................   64
                   Reinvestment of Dividends and Distributions..   65
                Redemption of Shares............................   66
                Shareholder Accounts............................   67
                   Telephone Transactions.......................   67
                   Systematic Redemptions.......................   67
                Tax-Deferred Accounts...........................   68
                Income Dividends,
                Capital Gains Distributions and Tax Status......   70
                Principal Shareholders..........................   72
                Miscellaneous Information.......................   74
                   Shares of the Trust..........................   75
                   Shareholder Meetings.........................   75
                   Voting Rights................................   76
                   Master/Feeder Option.........................   76
                   Independent Accountants......................   76
                   Registration Statement.......................   77
                Performance Information.........................   78
                Financial Statements............................   81
                Appendix A......................................   82
</TABLE>
 
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Classification, portfolio turnover, 
                investment policies 
                and restrictions, and 
                investment strategies 
                and risks
 
CLASSIFICATION
 
   
               Each Fund is a series of the Trust, an open-end, management
               investment company. The Investment Company Act of 1940 ("1940
               Act") classifies mutual funds as either diversified or
               nondiversified. Janus Enterprise Fund, Janus Olympus Fund, Janus
               Special Situations Fund, Janus Twenty Fund, Janus Global Life
               Sciences Fund and Janus Global Technology Fund are nondiversified
               funds. Each of these Funds reserves the right to become a
               diversified fund by limiting the investments in which more than
               5% of its total assets are invested. Janus Fund, Janus Mercury
               Fund, Janus Worldwide Fund, Janus Balanced Fund, Janus Equity
               Income Fund, Janus Growth and Income Fund, Janus Flexible Income
               Fund, Janus High-Yield Fund, Janus Federal Tax-Exempt Fund and
               Janus Short-Term Bond Fund are diversified funds.
    
 
PORTFOLIO TURNOVER
 
               The Prospectuses include a discussion of portfolio turnover
               policies. Portfolio turnover is calculated by dividing total
               purchases or sales, whichever is less, by the average monthly
               value of a Fund's portfolio securities. The following table
               summarizes the portfolio turnover rates for the fiscal periods
               indicated. The information below is for fiscal years ended
               October 31.
 
 2
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<TABLE>
<CAPTION>
Fund Name                                                     1998      1997
- ----------------------------------------------------------------------------
<S>                                                           <C>       <C>
Janus Fund..................................................   70%      132%
Janus Enterprise Fund.......................................  134%      111%
Janus Mercury Fund..........................................  105%      157%
Janus Olympus Fund..........................................  123%      244%
Janus Special Situations Fund...............................  117%      146%(1)
Janus Twenty Fund...........................................   54%      123%
Janus Global Life Sciences Fund(2)..........................   N/A       N/A
Janus Global Technology Fund(2).............................   N/A       N/A
Janus Worldwide Fund........................................   86%       79%
Janus Balanced Fund.........................................   73%      139%
Janus Equity Income Fund....................................  101%      180%
Janus Growth and Income Fund................................   95%      127%
Janus Flexible Income Fund..................................  148%      207%
Janus High-Yield Fund.......................................  336%      404%
Janus Federal Tax-Exempt Fund...............................  227%      304%
Janus Short-Term Bond Fund..................................  101%      133%
</TABLE>
    
 
(1) Annualized rate based on the ten month period ended October 31, 1997.
(2) The Fund had not commenced operations as of October 31, 1998.
 
INVESTMENT POLICIES AND RESTRICTIONS APPLICABLE TO ALL FUNDS
 
               The Funds are subject to certain fundamental policies and
               restrictions that may not be changed without shareholder
               approval. Shareholder approval means approval by the lesser of
               (i) more than 50% of the outstanding voting securities of the
               Trust (or a particular Fund if a matter affects just that Fund),
               or (ii) 67% or more of the voting securities present at a meeting
               if the holders of more than 50% of the outstanding voting
               securities of the Trust (or a particular Fund) are present or
               represented by proxy. As fundamental policies, no Fund may:
 
               (1) Own more than 10% of the outstanding voting securities of any
               one issuer and, as to fifty percent (50%) of the value of its
               total assets for the nondiversified Funds and as to seventy-five
               percent (75%) of the value of the total assets of the diversified
               Funds, purchase the securities of any one issuer (except cash
               items and "government securities" as defined under the 1940 Act,
               as amended), if immediately after and as a result of such
               purchase, the value of the holdings of a Fund in the securities
               of such issuer exceeds 5% of the value of such Fund's total
               assets.
 
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               With respect to the other 50% of the value of their total assets,
               the nondiversified Funds may invest in the securities of as few
               as two issuers.
 
               (2) Invest 25% or more of the value of its total assets in any
               particular industry (other than U.S. government securities). This
               policy does not apply to Janus Global Life Sciences Fund. This
               policy does not apply to Janus Federal Tax-Exempt Fund regarding
               municipal obligations only. For the purposes of this limitation
               only, industrial development bonds issued by nongovernmental
               users shall not be deemed to be municipal obligations. Industrial
               development bonds shall be classified according to the industry
               of the entity that has the ultimate responsibility for the
               payment of principal and interest on the obligation.
 
               (3) Invest directly in real estate or interests in real estate;
               however, the Funds may own debt or equity securities issued by
               companies engaged in those businesses.
 
               (4) Purchase or sell physical commodities other than foreign
               currencies unless acquired as a result of ownership of securities
               (but this limitation shall not prevent the Funds from purchasing
               or selling options, futures, swaps and forward contracts or from
               investing in securities or other instruments backed by physical
               commodities).
 
               (5) Lend any security or make any other loan if, as a result,
               more than 25% of the Fund's total assets would be lent to other
               parties (but this limitation does not apply to purchases of
               commercial paper, debt securities or repurchase agreements).
 
               (6) Act as an underwriter of securities issued by others, except
               to the extent that the Fund may be deemed an underwriter in
               connection with the disposition of portfolio securities of the
               Fund.
 
               As a fundamental policy, each Fund may, notwithstanding any other
               investment policy or limitation (whether or not fundamental),
               invest all of its assets in the securities of a single open-end
               management investment company with substantially the same
               fundamental investment objectives, policies and limitations as
               such Fund.
 
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               The Trustees have adopted additional investment restrictions for
               the Funds. These restrictions are operating policies of the Funds
               and may be changed by the Trustees without shareholder approval.
               The additional investment restrictions adopted by the Trustees to
               date include the following:
 
               (a) A Fund will not (i) enter into any futures contracts and
               related options for purposes other than bona fide hedging
               transactions within the meaning of Commodity Futures Trading
               Commission ("CFTC") regulations if the aggregate initial margin
               and premiums required to establish positions in futures contracts
               and related options that do not fall within the definition of
               bona fide hedging transactions will exceed 5% of the fair market
               value of a Fund's net assets, after taking into account
               unrealized profits and unrealized losses on any such contracts it
               has entered into; and (ii) enter into any futures contracts if
               the aggregate amount of such Fund's commitments under outstanding
               futures contracts positions would exceed the market value of its
               total assets.
 
               (b) The Funds do not currently intend to sell securities short,
               unless they own or have the right to obtain securities equivalent
               in kind and amount to the securities sold short without the
               payment of any additional consideration therefor, and provided
               that transactions in futures, options, swaps and forward
               contracts are not deemed to constitute selling securities short.
 
               (c) The Funds do not currently intend to purchase securities on
               margin, except that the Funds may obtain such short-term credits
               as are necessary for the clearance of transactions, and provided
               that margin payments and other deposits in connection with
               transactions in futures, options, swaps and forward contracts
               shall not be deemed to constitute purchasing securities on
               margin.
 
               (d) A Fund may not mortgage or pledge any securities owned or
               held by such Fund in amounts that exceed, in the aggregate, 15%
               of that Fund's net asset value, provided that this limitation
               does not apply to reverse repurchase agreements, deposits of
               assets to margin, guarantee positions in futures, options, swaps
               or forward
 
                                                                               5
<PAGE> 
 
               contracts, or the segregation of assets in connection with such
               contracts.
 
               (e) The Funds may borrow money for temporary or emergency
               purposes (not for leveraging or investment) in an amount not
               exceeding 25% of the value of their respective total assets
               (including the amount borrowed) less liabilities (other than
               borrowings). If borrowings exceed 25% of the value of a Fund's
               total assets by reason of a decline in net assets, the Fund will
               reduce its borrowings within three business days to the extent
               necessary to comply with the 25% limitation. This policy shall
               not prohibit reverse repurchase agreements, deposits of assets to
               margin or guarantee positions in futures, options, swaps or
               forward contracts, or the segregation of assets in connection
               with such contracts.
 
               (f) The Funds do not currently intend to purchase any security or
               enter into a repurchase agreement if, as a result, more than 15%
               of their respective net assets would be invested in repurchase
               agreements not entitling the holder to payment of principal and
               interest within seven days and in securities that are illiquid by
               virtue of legal or contractual restrictions on resale or the
               absence of a readily available market. The Trustees, or the
               Funds' investment adviser acting pursuant to authority delegated
               by the Trustees, may determine that a readily available market
               exists for securities eligible for resale pursuant to Rule 144A
               under the Securities Act of 1933 ("Rule 144A Securities"), or any
               successor to such rule, Section 4(2) commercial paper and
               municipal lease obligations. Accordingly, such securities may not
               be subject to the foregoing limitation.
 
               (g) The Funds may not invest in companies for the purpose of
               exercising control of management.
 
               Under the terms of an exemptive order received from the
               Securities and Exchange Commission ("SEC"), each of the Funds may
               borrow money from or lend money to other funds that permit such
               transactions and for which Janus Capital serves as investment
               adviser. All such borrowing and lending will be subject to the
               above limits. A Fund will borrow money through the
 
 6
<PAGE> 
 
               program only when the costs are equal to or lower than the cost
               of bank loans. Interfund loans and borrowings normally extend
               overnight, but can have a maximum duration of seven days. A Fund
               will lend through the program only when the returns are higher
               than those available from other short-term instruments (such as
               repurchase agreements). A Fund may have to borrow from a bank at
               a higher interest rate if an interfund loan is called or not
               renewed. Any delay in repayment to a lending Fund could result in
               a lost investment opportunity or additional borrowing costs.
 
               For the purposes of these investment restrictions, the
               identification of the issuer of a municipal obligation depends on
               the terms and conditions of the security. When assets and
               revenues of a political subdivision are separate from those of
               the government that created the subdivision and the security is
               backed only by the assets and revenues of the subdivision, the
               subdivision is deemed to be the sole issuer. Similarly, in the
               case of an industrial development bond, if the bond is backed
               only by assets and revenues of a nongovernmental user, then the
               nongovernmental user would be deemed to be the sole issuer. If,
               however, in either case, the creating government or some other
               entity guarantees the security, the guarantee would be considered
               a separate security that would be treated as an issue of the
               guaranteeing entity.
 
               For the purposes of each Fund's policies on investing in
               particular industries, the Funds will rely primarily on industry
               or industry group classifications published by Bloomberg L.P. To
               the extent that Bloomberg L.P. industry classifications are so
               broad that the primary economic characteristics in a single
               industry are materially different, the Funds may further classify
               issuers in accordance with industry classifications as published
               by the SEC.
 
INVESTMENT POLICIES APPLICABLE TO CERTAIN FUNDS
 
               JANUS GLOBAL LIFE SCIENCES FUND. As a fundamental policy, Janus
               Global Life Sciences Fund will normally invest at least 25% of
               its total assets, in the aggregate, in the following industry
 
                                                                               7
<PAGE> 
 
               groups: health care; pharmaceuticals; agriculture;
               cosmetics/personal care; and biotechnology.
 
               JANUS BALANCED FUND. As an operational policy, at least 25% of
               the assets of Janus Balanced Fund normally will be invested in
               fixed-income securities.
 
               JANUS FLEXIBLE INCOME FUND. As a fundamental policy, this Fund
               may not purchase a non-income-producing security if, after such
               purchase, less than 80% of the Fund's total assets would be
               invested in income-producing securities. Income-producing
               securities include securities that make periodic interest
               payments as well as those that make interest payments on a
               deferred basis or pay interest only at maturity (e.g., Treasury
               bills or zero coupon bonds).
 
               JANUS FEDERAL TAX-EXEMPT FUND. As a fundamental policy, this Fund
               will normally invest at least 80% of its net assets in securities
               whose income is not subject to federal income taxes, including
               the alternative minimum tax.
 
               JANUS SHORT-TERM BOND FUND. As an operational policy, this Fund
               expects to maintain an average weighted effective maturity of
               three years or less. The portfolio manager may consider estimated
               prepayment dates or call dates of certain securities in computing
               the portfolio's effective maturity.
 
INVESTMENT STRATEGIES AND RISKS
 
Cash Position
 
   
               As discussed in the Prospectuses, when a Fund's portfolio manager
               believes that market conditions are unfavorable for profitable
               investing, or when he is otherwise unable to locate attractive
               investment opportunities, the Fund's investment in cash and
               similar investments may increase. Securities that the Funds may
               invest in as a means of receiving a return on idle cash include
               commercial paper, certificates of deposit, repurchase agreements
               or other short-term debt obligations. The Funds may also invest
               in money market funds, including funds managed by Janus Capital.
               (See "Investment Company Securities" on page 15).
    
 
 8
<PAGE> 
 
Illiquid Investments
 
               Each Fund may invest up to 15% of its net assets in illiquid
               investments (i.e., securities that are not readily marketable).
               The Trustees have authorized Janus Capital to make liquidity
               determinations with respect to certain securities, including Rule
               144A Securities, commercial paper and municipal lease obligations
               purchased by the Funds. Under the guidelines established by the
               Trustees, Janus Capital will consider the following factors: 1)
               the frequency of trades and quoted prices for the obligation; 2)
               the number of dealers willing to purchase or sell the security
               and the number of other potential purchasers; 3) the willingness
               of dealers to undertake to make a market in the security; and 4)
               the nature of the security and the nature of marketplace trades,
               including the time needed to dispose of the security, the method
               of soliciting offers and the mechanics of the transfer. In the
               case of commercial paper, Janus Capital will also consider
               whether the paper is traded flat or in default as to principal
               and interest and any ratings of the paper by a nationally
               recognized statistical rating organization ("NRSRO"). A foreign
               security that may be freely traded on or through the facilities
               of an offshore exchange or other established offshore securities
               market is not deemed to be a restricted security subject to these
               procedures.
 
               If illiquid securities exceed 15% of a Fund's net assets after
               the time of purchase the Fund will take steps to reduce in an
               orderly fashion its holdings of illiquid securities. Because
               illiquid securities may not be readily marketable, a portfolio
               manager may not be able to dispose of them in a timely manner. As
               a result, a Fund may be forced to hold illiquid securities while
               their price depreciates. Depreciation in the price of illiquid
               securities may cause the net asset value of a Fund to decline.
 
Foreign Securities
 
               The Funds 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
 
                                                                               9
<PAGE> 
 
               securities, because the Funds' performance may depend on issues
               other than the performance of a particular company. These issues
               include:
 
               CURRENCY RISK. As long as a Fund holds a foreign security, its
               value will be affected by the value of the local currency
               relative to the U.S. dollar. When a Fund 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 Fund's assets from that country.
 
               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.
 
 10
<PAGE> 
 
Short Sales
 
               Each Fund may engage in "short sales against the box." This
               technique involves selling either a security that a Fund owns, or
               a security equivalent in kind and amount to the security sold
               short that the Fund has the right to obtain, for delivery at a
               specified date in the future. A Fund may enter into a short sale
               against the box to hedge against anticipated declines in the
               market price of portfolio securities. If the value of the
               securities sold short increases prior to the scheduled delivery
               date, a Fund loses the opportunity to participate in the gain.
 
Zero Coupon, Step Coupon and Pay-In-Kind Securities
 
               Each Fund may invest up to 10% (without limit for Janus High-
               Yield Fund and Janus Flexible Income Fund) of its assets in zero
               coupon, pay-in-kind and step coupon securities. Zero coupon bonds
               are issued and traded at a discount from their face value. They
               do not entitle the holder to any periodic payment of interest
               prior to maturity. Step coupon bonds trade at a discount from
               their face value and pay coupon interest. The coupon rate is low
               for an initial period and then increases to a higher coupon rate
               thereafter. The discount from the face amount or par 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. Pay-in-kind bonds
               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. For the purposes of
               any Fund's restriction on investing in income-producing
               securities, income-producing securities include securities that
               make periodic interest payments as well as those that make
               interest payments on a deferred basis or pay interest only at
               maturity (e.g., Treasury bills or zero coupon bonds).
 
               Current federal income tax law requires holders of zero coupon
               and step coupon securities to report the portion of the original
               issue discount on such securities that accrues during a given
               year
 
                                                                              11
<PAGE> 
 
               as interest income, even though the holders receive no cash
               payments of interest during the year. In order to qualify as a
               "regulated investment company" under the Internal Revenue Code of
               1986 and the regulations thereunder (the "Code"), a Fund must
               distribute its investment company taxable income, including the
               original issue discount accrued on zero coupon or step coupon
               bonds. Because a Fund will not receive cash payments on a current
               basis in respect of accrued original-issue discount on zero
               coupon bonds or step coupon bonds during the period before
               interest payments begin, in some years that Fund may have to
               distribute cash obtained from other sources in order to satisfy
               the distribution requirements under the Code. A Fund might obtain
               such cash from selling other portfolio holdings which might cause
               the Fund to incur capital gains or losses on the sale.
               Additionally, these actions are likely to reduce the assets to
               which Fund expenses could be allocated and to reduce the rate of
               return for the Fund. In some circumstances, such sales might be
               necessary in order to satisfy cash distribution requirements even
               though investment considerations might otherwise make it
               undesirable for a Fund to sell the securities at the time.
 
               Generally, the market prices of zero coupon, step coupon and
               pay-in-kind securities are more volatile than the prices of
               securities that pay interest periodically and in cash and are
               likely to respond to changes in interest rates to a greater
               degree than other types of debt securities having similar
               maturities and credit quality.
 
Pass-Through Securities
 
               The Funds may invest in various types of pass-through securities,
               such as mortgage-backed securities, asset-backed securities and
               participation interests. A pass-through security is a share or
               certificate of interest in a pool of debt obligations that have
               been repackaged by an intermediary, such as a bank or
               broker-dealer. The purchaser of a pass-through security receives
               an undivided interest in the underlying pool of securities. The
               issuers of the underlying securities make interest and principal
               payments to the intermediary which are passed through to
               purchasers, such as the
 
 12
<PAGE> 
 
               Funds. The most common type of pass-through securities are
               mortgage-backed securities. Government National Mortgage
               Association ("GNMA") Certificates are mortgage-backed securities
               that evidence an undivided interest in a pool of mortgage loans.
               GNMA Certificates differ from bonds in that principal is paid
               back monthly by the borrowers over the term of the loan rather
               than returned in a lump sum at maturity. A Fund will generally
               purchase "modified pass-through" GNMA Certificates, which entitle
               the holder to receive a share of all interest and principal
               payments paid and owned on the mortgage pool, net of fees paid to
               the "issuer" and GNMA, regardless of whether or not the mortgagor
               actually makes the payment. GNMA Certificates are backed as to
               the timely payment of principal and interest by the full faith
               and credit of the U.S. government.
 
               The Federal Home Loan Mortgage Corporation ("FHLMC") issues two
               types of mortgage pass-through securities: mortgage participation
               certificates ("PCs") and guaranteed mortgage certificates
               ("GMCs"). PCs resemble GNMA Certificates in that each PC
               represents a pro rata share of all interest and principal
               payments made and owned on the underlying pool. FHLMC guarantees
               timely payments of interest on PCs and the full return of
               principal. GMCs also represent a pro rata interest in a pool of
               mortgages. However, these instruments pay interest semiannually
               and return principal once a year in guaranteed minimum payments.
               This type of security is guaranteed by FHLMC as to timely payment
               of principal and interest but it is not guaranteed by the full
               faith and credit of the U.S. government.
 
               The Federal National Mortgage Association ("FNMA") issues
               guaranteed mortgage pass-through certificates ("FNMA
               Certificates"). FNMA Certificates resemble GNMA Certificates in
               that each FNMA Certificate represents a pro rata share of all
               interest and principal payments made and owned on the underlying
               pool. This type of security is guaranteed by FNMA as to timely
               payment of principal and interest but it is not guaranteed by the
               full faith and credit of the U.S. government.
 
                                                                              13
<PAGE> 
 
               Except for GMCs, each of the mortgage-backed securities described
               above is characterized by monthly payments to the holder,
               reflecting the monthly payments made by the borrowers who
               received the underlying mortgage loans. The payments to the
               security holders (such as the Funds), like the payments on the
               underlying loans, represent both principal and interest. Although
               the underlying mortgage loans are for specified periods of time,
               such as 20 or 30 years, the borrowers can, and typically do, pay
               them off sooner. Thus, the security holders frequently receive
               prepayments of principal in addition to the principal that is
               part of the regular monthly payments. A portfolio manager will
               consider estimated prepayment rates in calculating the average
               weighted maturity of a Fund. A borrower is more likely to prepay
               a mortgage that bears a relatively high rate of interest. This
               means that in times of declining interest rates, higher yielding
               mortgage-backed securities held by a Fund might be converted to
               cash and that Fund will be forced to accept lower interest rates
               when that cash is used to purchase additional securities in the
               mortgage-backed securities sector or in other investment sectors.
               Additionally, prepayments during such periods will limit a Fund's
               ability to participate in as large a market gain as may be
               experienced with a comparable security not subject to prepayment.
 
               Asset-backed securities represent interests in pools of consumer
               loans and are backed by paper or accounts receivables originated
               by banks, credit card companies or other providers of credit.
               Generally, the originating bank or credit provider is neither the
               obligor nor the guarantor of the security, and interest and
               principal payments ultimately depend upon payment of the
               underlying loans by individuals. Tax-exempt asset-backed
               securities include units of beneficial interests in pools of
               purchase contracts, financing leases, and sales agreements that
               may be created when a municipality enters into an installment
               purchase contract or lease with a vendor. Such securities may be
               secured by the assets purchased or leased by the municipality;
               however, if the municipality stops making payments, there
               generally will be no recourse against the vendor. These
               obligations are likely to involve unscheduled prepayments of
               principal.
 
 14
<PAGE> 
 
Investment Company Securities
 
               From time to time, the Funds may invest in securities of other
               investment companies, subject to the provisions of Section
               12(d)(1) of the 1940 Act. The Funds may invest in securities of
               money market funds managed by Janus Capital in excess of the
               limitations of Section 12(d)(1) under the terms of an SEC
               exemptive order obtained by Janus Capital and the Janus funds.
 
Depositary Receipts
 
               The Funds may invest in sponsored and unsponsored American
               Depositary Receipts ("ADRs"), which are receipts issued by an
               American bank or trust company evidencing ownership of underlying
               securities issued by a foreign issuer. ADRs, in registered form,
               are designed for use in U.S. securities markets. Unsponsored ADRs
               may be created without the participation of the foreign issuer.
               Holders of these ADRs generally bear all the costs of the ADR
               facility, whereas foreign issuers typically bear certain costs in
               a sponsored ADR. The bank or trust company depositary of an
               unsponsored ADR may be under no obligation to distribute
               shareholder communications received from the foreign issuer or to
               pass through voting rights. The Funds may also invest in European
               Depositary Receipts ("EDRs"), Global Depositary Receipts ("GDRs")
               and in other similar instruments representing securities of
               foreign companies. EDRs are receipts issued by a European
               financial institution evidencing an arrangement similar to that
               of ADRs. EDRs, in bearer form, are designed for use in European
               securities markets.
 
               Depositary Receipts are generally subject to the same sort of
               risks as direct investments in a foreign country, such as,
               currency risk, political and economic risk, and market risk,
               because their values depend on the performance of a foreign
               security denominated in its home currency. The risks of foreign
               investing are addressed in some detail in the Funds'
               prospectuses.
 
                                                                              15
<PAGE> 
 
Municipal Obligations
 
               The Funds may invest in municipal obligations issued by states,
               territories and possessions of the United States and the District
               of Columbia. Janus Federal Tax-Exempt Fund may, at times, invest
               more than 25% of the value of its assets in industrial
               development bonds, a type of revenue bond which, although issued
               by a public authority, may be backed only by the credit and
               security of a private issuer, thus presenting a greater credit
               risk.
 
               The value of municipal obligations can be affected by changes in
               their actual or perceived credit quality. The credit quality of
               municipal obligations can be affected by among other things the
               financial condition of the issuer or guarantor, the issuer's
               future borrowing plans and sources of revenue, the economic
               feasibility of the revenue bond project or general borrowing
               purpose, political or economic developments in the region where
               the security is issued, and the liquidity of the security.
               Because municipal securities are generally traded
               over-the-counter, the liquidity of a particular issue often
               depends on the willingness of dealers to make a market in the
               security. The liquidity of some municipal obligations may be
               enhanced by demand features, which would enable a Fund to demand
               payment on short notice from the issuer or a financial
               intermediary.
 
Other Income-Producing Securities
 
               Other types of income producing securities that the Funds may
               purchase include, but are not limited to, the following types of
               securities:
 
               VARIABLE AND FLOATING RATE OBLIGATIONS. These types of 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. These types of securities are relatively
               long-term instruments that often carry demand features permitting
               the holder to demand
 
 16
<PAGE> 
 
               payment of principal at any time or at specified intervals prior
               to maturity.
 
               In order to most effectively use these investments, a portfolio
               manager must correctly assess probable movements in interest
               rates. This involves different skills than those used to select
               most portfolio securities. If the portfolio manager incorrectly
               forecasts such movements, a Fund could be adversely affected by
               the use of variable or floating rate obligations.
 
               STANDBY COMMITMENTS. These instruments, which are similar to a
               put, give a Fund the option to obligate a broker, dealer or bank
               to repurchase a security held by that Fund at a specified price.
 
               TENDER OPTION BONDS. Tender option bonds are relatively long-
               term bonds that are coupled with the agreement of a third party
               (such as a broker, dealer or bank) to grant the holders of such
               securities the option to tender the securities to the institution
               at periodic intervals.
 
               INVERSE FLOATERS. Inverse floaters are debt instruments whose
               interest bears an inverse relationship to the interest rate on
               another security. No Fund will invest more than 5% of its assets
               in inverse floaters. Similar to variable and floating rate
               obligations, effective use of inverse floaters requires skills
               different from those needed to select most portfolio securities.
               If movements in interest rates are incorrectly anticipated, a
               Fund could lose money or its NAV could decline by the use of
               inverse floaters.
 
               STRIP BONDS. 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.
 
               The Funds will purchase standby commitments, tender option bonds
               and instruments with demand features primarily for the purpose of
               increasing the liquidity of their portfolios.
 
                                                                              17
<PAGE> 
 
Repurchase and Reverse Repurchase Agreements
 
               In a repurchase agreement, a Fund purchases a security and
               simultaneously commits to resell that security to the seller at
               an agreed upon price on an agreed upon date within a number of
               days (usually not more than seven) from the date of purchase. The
               resale price consists of the purchase price plus an agreed upon
               incremental amount that is unrelated to the coupon rate or
               maturity of the purchased security. A repurchase agreement
               involves the obligation of the seller to pay the agreed upon
               price, which obligation is in effect secured by the value (at
               least equal to the amount of the agreed upon resale price and
               marked-to-market daily) of the underlying security or
               "collateral." A risk associated with repurchase agreements is the
               failure of the seller to repurchase the securities as agreed,
               which may cause a Fund to suffer a loss if the market value of
               such securities declines before they can be liquidated on the
               open market. In the event of bankruptcy or insolvency of the
               seller, a Fund may encounter delays and incur costs in
               liquidating the underlying security. Repurchase agreements that
               mature in more than seven days are subject to the 15% limit on
               illiquid investments. While it is not possible to eliminate all
               risks from these transactions, it is the policy of the Funds to
               limit repurchase agreements to those parties whose
               creditworthiness has been reviewed and found satisfactory by
               Janus Capital.
 
               A Fund may use reverse repurchase agreements to obtain cash to
               satisfy unusually heavy redemption requests or for other
               temporary or emergency purposes without the necessity of selling
               portfolio securities, or to earn additional income on portfolio
               securities, such as Treasury bills or notes. In a reverse
               repurchase agreement, a Fund sells a portfolio security to
               another party, such as a bank or broker-dealer, in return for
               cash and agrees to repurchase the instrument at a particular
               price and time. While a reverse repurchase agreement is
               outstanding, a Fund will maintain cash and appropriate liquid
               assets in a segregated custodial account to cover its obligation
               under the agreement. The Funds will enter into reverse repurchase
               agreements only with parties that Janus Capital deems
               creditworthy. Using reverse repurchase
 
 18
<PAGE> 
 
               agreements to earn additional income involves the risk that the
               interest earned on the invested proceeds is less than the expense
               of the reverse repurchase agreement transaction. This technique
               may also have a leveraging effect on the Fund's portfolio,
               although the Fund's intent to segregate assets in the amount of
               the reverse repurchase agreement minimizes this effect.
 
High-Yield/High-Risk Securities
 
               Janus Flexible Income Fund and Janus High-Yield Fund may invest
               without limit in securities that are rated below investment grade
               (e.g., securities rated BB or lower by Standard & Poor's Ratings
               Services or Ba or lower by Moody's Investors Service, Inc.). No
               other Fund intends to invest 35% or more of its net assets in
               such securities. Lower rated securities involve a higher degree
               of credit risk, which is the risk that the issuer will not make
               interest or principal payments when due. In the event of an
               unanticipated default, a Fund would experience a reduction in its
               income, and could expect a decline in the market value of the
               securities so affected.
 
               Any Fund may also invest in unrated debt securities of foreign
               and domestic issuers. Unrated debt, while not necessarily of
               lower quality than rated securities, may not have as broad a
               market. Because of the size and perceived demand of the issue,
               among other factors, certain municipalities may not incur the
               costs of obtaining a rating. A Fund's portfolio manager will
               analyze the creditworthiness of the issuer, as well as any
               financial institution or other party responsible for payments on
               the security, in determining whether to purchase unrated
               municipal bonds. Unrated debt securities will be included in the
               35% limit of each Fund unless its portfolio manager deems such
               securities to be the equivalent of investment grade securities.
 
               Subject to the above limits, each Fund may purchase defaulted
               securities only when its portfolio manager believes, based upon
               his analysis of the financial condition, results of operations
               and economic outlook of an issuer, that there is potential for
               resumption of income payments and that the securities offer an
 
                                                                              19
<PAGE> 
 
               unusual opportunity for capital appreciation. Notwithstanding the
               portfolio manager's belief about the resumption of income,
               however, the purchase of any security on which payment of
               interest or dividends is suspended involves a high degree of
               risk. Such risk includes, among other things, the following:
 
               Financial and Market Risks. Investments in securities that are in
               default involve a high degree of financial and market risks that
               can result in substantial or, at times, even total losses.
               Issuers of defaulted securities may have substantial capital
               needs and may become involved in bankruptcy or reorganization
               proceedings. Among the problems involved in investments in such
               issuers is the fact that it may be difficult to obtain
               information about the condition of such issuers. The market
               prices of such securities also are subject to abrupt and erratic
               movements and above average price volatility, and the spread
               between the bid and asked prices of such securities may be
               greater than normally expected.
 
               Disposition of Portfolio Securities. Although these Funds
               generally will purchase securities for which their portfolio
               managers expect an active market to be maintained, defaulted
               securities may be less actively traded than other securities and
               it may be difficult to dispose of substantial holdings of such
               securities at prevailing market prices. The Funds will limit
               holdings of any such securities to amounts that the portfolio
               managers believe could be readily sold, and holdings of such
               securities would, in any event, be limited so as not to limit the
               Funds' ability to readily dispose of securities to meet
               redemptions.
 
               Other. Defaulted securities require active monitoring and may, at
               times, require participation in bankruptcy or receivership
               proceedings on behalf of the Funds.
 
Futures, Options and Other Derivative Instruments
 
               FUTURES CONTRACTS. The Funds may enter into contracts for the
               purchase or sale for future delivery of fixed-income securities,
               foreign currencies or contracts based on financial indices,
               including indices of U.S. government securities, foreign
               government securities, equity or fixed-income securities. U.S.
               futures contracts
 
 20
<PAGE> 
 
               are traded on exchanges which have been designated "contract
               markets" by the CFTC and must be executed through a futures
               commission merchant ("FCM"), or brokerage firm, which is a member
               of the relevant contract market. Through their clearing
               corporations, the exchanges guarantee performance of the
               contracts as between the clearing members of the exchange.
 
               The buyer or seller of a futures contract is not required to
               deliver or pay for the underlying instrument unless the contract
               is held until the delivery date. However, both the buyer and
               seller are required to deposit "initial margin" for the benefit
               of the FCM when the contract is entered into. Initial margin
               deposits are equal to a percentage of the contract's value, as
               set by the exchange on which the contract is traded, and may be
               maintained in cash or certain other liquid assets by the Funds'
               custodian for the benefit of the FCM. Initial margin payments are
               similar to good faith deposits or performance bonds. Unlike
               margin extended by a securities broker, initial margin payments
               do not constitute purchasing securities on margin for purposes of
               the Fund's investment limitations. If the value of either party's
               position declines, that party will be required to make additional
               "variation margin" payments for the benefit of the FCM to settle
               the change in value on a daily basis. The party that has a gain
               may be entitled to receive all or a portion of this amount. In
               the event of the bankruptcy of the FCM that holds margin on
               behalf of a Fund, that Fund may be entitled to return of margin
               owed to such Fund only in proportion to the amount received by
               the FCM's other customers. Janus Capital will attempt to minimize
               the risk by careful monitoring of the creditworthiness of the
               FCMs with which the Funds do business and by depositing margin
               payments in a segregated account with the Funds' custodian.
 
               The Funds intend to comply with guidelines of eligibility for
               exclusion from the definition of the term "commodity pool
               operator" adopted by the CFTC and the National Futures
               Association, which regulate trading in the futures markets. The
               Funds will use futures contracts and related options primarily
               for bona fide hedging purposes within the meaning of CFTC
 
                                                                              21
<PAGE> 
 
               regulations. To the extent that the Funds hold positions in
               futures contracts and related options that do not fall within the
               definition of bona fide hedging transactions, the aggregate
               initial margin and premiums required to establish such positions
               will not exceed 5% of the fair market value of a Fund's net
               assets, after taking into account unrealized profits and
               unrealized losses on any such contracts it has entered into.
 
               Although a Fund will segregate cash and liquid assets in an
               amount sufficient to cover its open futures obligations, the
               segregated assets would be available to that Fund immediately
               upon closing out the futures position, while settlement of
               securities transactions could take several days. However, because
               a Fund's cash that may otherwise be invested would be held
               uninvested or invested in other liquid assets so long as the
               futures position remains open, such Fund's return could be
               diminished due to the opportunity losses of foregoing other
               potential investments.
 
               A Fund's primary purpose in entering into futures contracts is to
               protect that Fund from fluctuations in the value of securities or
               interest rates without actually buying or selling the underlying
               debt or equity security. For example, if the Fund anticipates an
               increase in the price of stocks, and it intends to purchase
               stocks at a later time, that Fund could enter into a futures
               contract to purchase a stock index as a temporary substitute for
               stock purchases. If an increase in the market occurs that
               influences the stock index as anticipated, the value of the
               futures contracts will increase, thereby serving as a hedge
               against that Fund not participating in a market advance. This
               technique is sometimes known as an anticipatory hedge. To the
               extent a Fund enters into futures contracts for this purpose, the
               segregated assets maintained to cover such Fund's obligations
               with respect to the futures contracts will consist of other
               liquid assets from its portfolio in an amount equal to the
               difference between the contract price and the aggregate value of
               the initial and variation margin payments made by that Fund with
               respect to the futures contracts. Conversely, if a Fund holds
               stocks and seeks to protect itself from a decrease in stock
               prices, the Fund might sell stock index futures contracts,
 
 22
<PAGE> 
 
               thereby hoping to offset the potential decline in the value of
               its portfolio securities by a corresponding increase in the value
               of the futures contract position. A Fund could protect against a
               decline in stock prices by selling portfolio securities and
               investing in money market instruments, but the use of futures
               contracts enables it to maintain a defensive position without
               having to sell portfolio securities.
 
               If a Fund owns Treasury bonds and the portfolio manager expects
               interest rates to increase, that Fund may take a short position
               in interest rate futures contracts. Taking such a position would
               have much the same effect as that Fund selling Treasury bonds in
               its portfolio. If interest rates increase as anticipated, the
               value of the Treasury bonds would decline, but the value of that
               Fund's interest rate futures contract will increase, thereby
               keeping the net asset value of that Fund from declining as much
               as it may have otherwise. If, on the other hand, a portfolio
               manager expects interest rates to decline, that Fund may take a
               long position in interest rate futures contracts in anticipation
               of later closing out the futures position and purchasing the
               bonds. Although a Fund can accomplish similar results by buying
               securities with long maturities and selling securities with short
               maturities, given the greater liquidity of the futures market
               than the cash market, it may be possible to accomplish the same
               result more easily and more quickly by using futures contracts as
               an investment tool to reduce risk.
 
               The ordinary spreads between prices in the cash and futures
               markets, due to differences in the nature of those markets, are
               subject to distortions. First, all participants in the futures
               market are subject to initial margin and variation margin
               requirements. Rather than meeting additional variation margin
               requirements, investors may close out futures contracts through
               offsetting transactions which could distort the normal price
               relationship between the cash and futures markets. Second, the
               liquidity of the futures market depends on participants entering
               into offsetting transactions rather than making or taking
               delivery of the instrument underlying a futures contract. To the
               extent partici-
 
                                                                              23
<PAGE> 
 
               pants decide to make or take delivery, liquidity in the futures
               market could be reduced and prices in the futures market
               distorted. Third, from the point of view of speculators, the
               margin deposit requirements in the futures market are less
               onerous than margin requirements in the securities market.
               Therefore, increased participation by speculators in the futures
               market may cause temporary price distortions. Due to the
               possibility of the foregoing distortions, a correct forecast of
               general price trends by a portfolio manager still may not result
               in a successful use of futures.
 
               Futures contracts entail risks. Although the Funds believe that
               use of such contracts will benefit the Funds, a Fund's overall
               performance could be worse than if such Fund had not entered into
               futures contracts if the portfolio manager's investment judgement
               proves incorrect. For example, if a Fund has hedged against the
               effects of a possible decrease in prices of securities held in
               its portfolio and prices increase instead, that Fund will lose
               part or all of the benefit of the increased value of these
               securities because of offsetting losses in its futures positions.
               In addition, if a Fund has insufficient cash, it may have to sell
               securities from its portfolio to meet daily variation margin
               requirements. Those sales may be, but will not necessarily be, at
               increased prices which reflect the rising market and may occur at
               a time when the sales are disadvantageous to such Fund.
 
               The prices of futures contracts depend primarily on the value of
               their underlying instruments. Because there are a limited number
               of types of futures contracts, it is possible that the
               standardized futures contracts available to a Fund will not match
               exactly such Fund's current or potential investments. A Fund may
               buy and sell futures contracts based on underlying instruments
               with different characteristics from the securities in which it
               typically invests -- for example, by hedging investments in
               portfolio securities with a futures contract based on a broad
               index of securities -- which involves a risk that the futures
               position will not correlate precisely with the performance of
               such Fund's investments.
 
               Futures prices can also diverge from the prices of their
               underlying instruments, even if the underlying instruments
               closely correlate
 
 24
<PAGE> 
 
               with a Fund's investments. Futures prices are affected by factors
               such as current and anticipated short-term interest rates,
               changes in volatility of the underlying instruments and the time
               remaining until expiration of the contract. Those factors may
               affect securities prices differently from futures prices.
               Imperfect correlations between a Fund's investments and its
               futures positions also may result from differing levels of demand
               in the futures markets and the securities markets, from
               structural differences in how futures and securities are traded,
               and from imposition of daily price fluctuation limits for futures
               contracts. A Fund may buy or sell futures contracts with a
               greater or lesser value than the securities it wishes to hedge or
               is considering purchasing in order to attempt to compensate for
               differences in historical volatility between the futures contract
               and the securities, although this may not be successful in all
               cases. If price changes in a Fund's futures positions are poorly
               correlated with its other investments, its futures positions may
               fail to produce desired gains or result in losses that are not
               offset by the gains in that Fund's other investments.
 
               Because futures contracts are generally settled within a day from
               the date they are closed out, compared with a settlement period
               of three days for some types of securities, the futures markets
               can provide superior liquidity to the securities markets.
               Nevertheless, there is no assurance that a liquid secondary
               market will exist for any particular futures contract at any
               particular time. In addition, futures exchanges may establish
               daily price fluctuation limits for futures contracts and may halt
               trading if a contract's price moves upward or downward more than
               the limit in a given day. On volatile trading days when the price
               fluctuation limit is reached, it may be impossible for a Fund to
               enter into new positions or close out existing positions. If the
               secondary market for a futures contract is not liquid because of
               price fluctuation limits or otherwise, a Fund may not be able to
               promptly liquidate unfavorable futures positions and potentially
               could be required to continue to hold a futures position until
               the delivery date, regardless of changes in its value. As a
               result, such Fund's access
 
                                                                              25
<PAGE> 
 
               to other assets held to cover its futures positions also could be
               impaired.
 
               OPTIONS ON FUTURES CONTRACTS. The Funds may buy and write put and
               call options on futures contracts. An option on a future gives a
               Fund the right (but not the obligation) to buy or sell a futures
               contract at a specified price on or before a specified date. The
               purchase of a call option on a futures contract is similar in
               some respects to the purchase of a call option on an individual
               security. Depending on the pricing of the option compared to
               either the price of the futures contract upon which it is based
               or the price of the underlying instrument, ownership of the
               option may or may not be less risky than ownership of the futures
               contract or the underlying instrument. As with the purchase of
               futures contracts, when a Fund is not fully invested it may buy a
               call option on a futures contract to hedge against a market
               advance.
 
               The writing of a call option on a futures contract constitutes a
               partial hedge against declining prices of the security or foreign
               currency which is deliverable under, or of the index comprising,
               the futures contract. If the futures' price at the expiration of
               the option is below the exercise price, a Fund will retain the
               full amount of the option premium which provides a partial hedge
               against any decline that may have occurred in that Fund's
               portfolio holdings. The writing of a put option on a futures
               contract constitutes a partial hedge against increasing prices of
               the security or foreign currency which is deliverable under, or
               of the index comprising, the futures contract. If the futures'
               price at expiration of the option is higher than the exercise
               price, a Fund will retain the full amount of the option premium
               which provides a partial hedge against any increase in the price
               of securities which that Fund is considering buying. If a call or
               put option a Fund has written is exercised, such Fund will incur
               a loss which will be reduced by the amount of the premium it
               received. Depending on the degree of correlation between the
               change in the value of its portfolio securities and changes in
               the value of the futures positions, a Fund's losses from existing
               options on futures
 
 26
<PAGE> 
 
               may to some extent be reduced or increased by changes in the
               value of portfolio securities.
 
               The purchase of a put option on a futures contract is similar in
               some respects to the purchase of protective put options on
               portfolio securities. For example, a Fund may buy a put option on
               a futures contract to hedge its portfolio against the risk of
               falling prices or rising interest rates.
 
               The amount of risk a Fund assumes when it buys an option on a
               futures contract is the premium paid for the option plus related
               transaction costs. In addition to the correlation risks discussed
               above, the purchase of an option also entails the risk that
               changes in the value of the underlying futures contract will not
               be fully reflected in the value of the options bought.
 
               FORWARD CONTRACTS. A forward contract is an agreement between two
               parties in which one party is obligated to deliver a stated
               amount of a stated asset at a specified time in the future and
               the other party is obligated to pay a specified amount for the
               assets at the time of delivery. The Funds may enter into forward
               contracts to purchase and sell government securities, equity or
               income securities, foreign currencies or other financial
               instruments. Forward contracts generally are traded in an
               interbank market conducted directly between traders (usually
               large commercial banks) and their customers. Unlike futures
               contracts, which are standardized contracts, forward contracts
               can be specifically drawn to meet the needs of the parties that
               enter into them. The parties to a forward contract may agree to
               offset or terminate the contract before its maturity, or may hold
               the contract to maturity and complete the contemplated exchange.
 
               The following discussion summarizes the Funds' principal uses of
               forward foreign currency exchange contracts ("forward currency
               contracts"). A Fund may enter into forward currency contracts
               with stated contract values of up to the value of that Fund's
               assets. A forward currency contract is an obligation to buy or
               sell an amount of a specified currency for an agreed price (which
               may be in U.S. dollars or a foreign currency). A Fund will
               exchange
 
                                                                              27
<PAGE> 
 
               foreign currencies for U.S. dollars and for other foreign
               currencies in the normal course of business and may buy and sell
               currencies through forward currency contracts in order to fix a
               price for securities it has agreed to buy or sell ("transaction
               hedge"). A Fund also may hedge some or all of its investments
               denominated in a foreign currency or exposed to foreign currency
               fluctuations against a decline in the value of that currency
               relative to the U.S. dollar by entering into forward currency
               contracts to sell an amount of that currency (or a proxy currency
               whose performance is expected to replicate or exceed the
               performance of that currency relative to the U.S. dollar)
               approximating the value of some or all of its portfolio
               securities denominated in that currency ("position hedge") or by
               participating in options or futures contracts with respect to the
               currency. A Fund also may enter into a forward currency contract
               with respect to a currency where the Fund is considering the
               purchase or sale of investments denominated in that currency but
               has not yet selected the specific investments ("anticipatory
               hedge"). In any of these circumstances a Fund may, alternatively,
               enter into a forward currency contract to purchase or sell one
               foreign currency for a second currency that is expected to
               perform more favorably relative to the U.S. dollar if the
               portfolio manager believes there is a reasonable degree of
               correlation between movements in the two currencies
               ("cross-hedge").
 
               These types of hedging minimize the effect of currency
               appreciation as well as depreciation, but do not eliminate
               fluctuations in the underlying U.S. dollar equivalent value of
               the proceeds of or rates of return on a Fund's foreign currency
               denominated portfolio securities. The matching of the increase in
               value of a forward contract and the decline in the U.S. dollar
               equivalent value of the foreign currency denominated asset that
               is the subject of the hedge generally will not be precise.
               Shifting a Fund's currency exposure from one foreign currency to
               another removes that Fund's opportunity to profit from increases
               in the value of the original currency and involves a risk of
               increased losses to such Fund if its portfolio manager's
               projection of future exchange rates is inaccurate. Proxy hedges
               and cross-hedges may result in losses
 
 28
<PAGE> 
 
               if the currency used to hedge does not perform similarly to the
               currency in which hedged securities are denominated. Unforeseen
               changes in currency prices may result in poorer overall
               performance for a Fund than if it had not entered into such
               contracts.
 
               The Funds will cover outstanding forward currency contracts by
               maintaining liquid portfolio securities denominated in or whose
               value is tied to, the currency underlying the forward contract or
               the currency being hedged. To the extent that a Fund is not able
               to cover its forward currency positions with underlying portfolio
               securities, the Funds' custodian will segregate cash or other
               liquid assets having a value equal to the aggregate amount of
               such Fund's commitments under forward contracts entered into with
               respect to position hedges, cross-hedges and anticipatory hedges.
               If the value of the securities used to cover a position or the
               value of segregated assets declines, a Fund will find alternative
               cover or segregate additional cash or liquid assets on a daily
               basis so that the value of the covered and segregated assets will
               be equal to the amount of such Fund's commitments with respect to
               such contracts. As an alternative to segregating assets, a Fund
               may buy call options permitting such Fund to buy the amount of
               foreign currency being hedged by a forward sale contract or a
               Fund may buy put options permitting it to sell the amount of
               foreign currency subject to a forward buy contract.
 
               While forward contracts are not currently regulated by the CFTC,
               the CFTC may in the future assert authority to regulate forward
               contacts. In such event, the Funds' ability to utilize forward
               contracts may be restricted. In addition, a Fund may not always
               be able to enter into forward contracts at attractive prices and
               may be limited in its ability to use these contracts to hedge
               Fund assets.
 
               OPTIONS ON FOREIGN CURRENCIES. The Funds may buy and write
               options on foreign currencies in a manner similar to that in
               which futures or forward contracts on foreign currencies will be
               utilized. For example, a decline in the U.S. dollar value of a
               foreign currency in which portfolio securities are denominated
               will reduce
 
                                                                              29
<PAGE> 
 
               the U.S. dollar value of such securities, even if their value in
               the foreign currency remains constant. In order to protect
               against such diminutions in the value of portfolio securities, a
               Fund may buy put options on the foreign currency. If the value of
               the currency declines, such Fund will have the right to sell such
               currency for a fixed amount in U.S. dollars, thereby offsetting,
               in whole or in part, the adverse effect on its portfolio.
 
               Conversely, when a rise in the U.S. dollar value of a currency in
               which securities to be acquired are denominated is projected,
               thereby increasing the cost of such securities, a Fund may buy
               call options on the foreign currency. The purchase of such
               options could offset, at least partially, the effects of the
               adverse movements in exchange rates. As in the case of other
               types of options, however, the benefit to a Fund from purchases
               of foreign currency options will be reduced by the amount of the
               premium and related transaction costs. In addition, if currency
               exchange rates do not move in the direction or to the extent
               projected, a Fund could sustain losses on transactions in foreign
               currency options that would require such Fund to forego a portion
               or all of the benefits of advantageous changes in those rates.
 
               The Funds may also write options on foreign currencies. For
               example, to hedge against a potential decline in the U.S. dollar
               value of foreign currency denominated securities due to adverse
               fluctuations in exchange rates, a Fund could, instead of
               purchasing a put option, write a call option on the relevant
               currency. If the expected decline occurs, the option will most
               likely not be exercised and the decline in value of portfolio
               securities will be offset by the amount of the premium received.
 
               Similarly, instead of purchasing a call option to hedge against a
               potential increase in the U.S. dollar cost of securities to be
               acquired, a Fund could write a put option on the relevant
               currency which, if rates move in the manner projected, should
               expire unexercised and allow that Fund to hedge the increased
               cost up to the amount of the premium. As in the case of other
               types of options, however, the writing of a foreign currency
               option will constitute only a partial hedge up to the amount of
               the
 
 30
<PAGE> 
 
               premium. If exchange rates do not move in the expected direction,
               the option may be exercised and a Fund would be required to buy
               or sell the underlying currency at a loss which may not be offset
               by the amount of the premium. Through the writing of options on
               foreign currencies, a Fund also may lose all or a portion of the
               benefits which might otherwise have been obtained from favorable
               movements in exchange rates.
 
               The Funds may write covered call options on foreign currencies. A
               call option written on a foreign currency by a Fund is "covered"
               if that Fund owns the foreign currency underlying the call or has
               an absolute and immediate right to acquire that foreign currency
               without additional cash consideration (or for additional cash
               consideration held in a segregated account by its custodian) upon
               conversion or exchange of other foreign currencies held in its
               portfolio. A call option is also covered if a Fund has a call on
               the same foreign currency in the same principal amount as the
               call written if the exercise price of the call held (i) is equal
               to or less than the exercise price of the call written or (ii) is
               greater than the exercise price of the call written, if the
               difference is maintained by such Fund in cash or other liquid
               assets in a segregated account with the Funds' custodian.
 
               The Funds also may write call options on foreign currencies for
               cross-hedging purposes. A call option on a foreign currency is
               for cross-hedging purposes if it is designed to provide a hedge
               against a decline due to an adverse change in the exchange rate
               in the U.S. dollar value of a security which a Fund owns or has
               the right to acquire and which is denominated in the currency
               underlying the option. Call options on foreign currencies which
               are entered into for cross-hedging purposes are not covered.
               However, in such circumstances, a Fund will collateralize the
               option by segregating cash or other liquid assets in an amount
               not less than the value of the underlying foreign currency in
               U.S. dollars marked-to-market daily.
 
               OPTIONS ON SECURITIES. In an effort to increase current income
               and to reduce fluctuations in net asset value, the Funds may
               write
 
                                                                              31
<PAGE> 
 
               covered put and call options and buy put and call options on
               securities that are traded on United States and foreign
               securities exchanges and over-the-counter. The Funds may write
               and buy options on the same types of securities that the Funds
               may purchase directly.
 
               A put option written by a Fund is "covered" if that Fund (i)
               segregates cash not available for investment or other liquid
               assets with a value equal to the exercise price of the put with
               the Funds' custodian or (ii) holds a put on the same security and
               in the same principal amount as the put written and the exercise
               price of the put held is equal to or greater than the exercise
               price of the put written. The premium paid by the buyer of an
               option will reflect, among other things, the relationship of the
               exercise price to the market price and the volatility of the
               underlying security, the remaining term of the option, supply and
               demand and interest rates.
 
               A call option written by a Fund is "covered" if that Fund owns
               the underlying security covered by the call or has an absolute
               and immediate right to acquire that security without additional
               cash consideration (or for additional cash consideration held in
               a segregated account by the Funds' custodian) upon conversion or
               exchange of other securities held in its portfolio. A call option
               is also deemed to be covered if a Fund holds a call on the same
               security and in the same principal amount as the call written and
               the exercise price of the call held (i) is equal to or less than
               the exercise price of the call written or (ii) is greater than
               the exercise price of the call written if the difference is
               maintained by that Fund in cash and other liquid assets in a
               segregated account with its custodian.
 
               The Funds also may write call options that are not covered for
               cross-hedging purposes. A Fund collateralizes its obligation
               under a written call option for cross-hedging purposes by
               segregating cash or other liquid assets in an amount not less
               than the market value of the underlying security,
               marked-to-market daily. A Fund would write a call option for
               cross-hedging purposes, instead of writing a covered call option,
               when the premium to be received
 
 32
<PAGE> 
 
               from the cross-hedge transaction would exceed that which would be
               received from writing a covered call option and its portfolio
               manager believes that writing the option would achieve the
               desired hedge.
 
               The writer of an option may have no control over when the
               underlying securities must be sold, in the case of a call option,
               or bought, in the case of a put option, since with regard to
               certain options, the writer may be assigned an exercise notice at
               any time prior to the termination of the obligation. Whether or
               not an option expires unexercised, the writer retains the amount
               of the premium. This amount, of course, may, in the case of a
               covered call option, be offset by a decline in the market value
               of the underlying security during the option period. If a call
               option is exercised, the writer experiences a profit or loss from
               the sale of the underlying security. If a put option is
               exercised, the writer must fulfill the obligation to buy the
               underlying security at the exercise price, which will usually
               exceed the then market value of the underlying security.
 
               The writer of an option that wishes to terminate its obligation
               may effect a "closing purchase transaction." This is accomplished
               by buying an option of the same series as the option previously
               written. The effect of the purchase is that the writer's position
               will be canceled by the clearing corporation. However, a writer
               may not effect a closing purchase transaction after being
               notified of the exercise of an option. Likewise, an investor who
               is the holder of an option may liquidate its position by
               effecting a "closing sale transaction." This is accomplished by
               selling an option of the same series as the option previously
               bought. There is no guarantee that either a closing purchase or a
               closing sale transaction can be effected.
 
               In the case of a written call option, effecting a closing
               transaction will permit a Fund to write another call option on
               the underlying security with either a different exercise price or
               expiration date or both. In the case of a written put option,
               such transaction will permit a Fund to write another put option
               to the extent that the
 
                                                                              33
<PAGE> 
 
               exercise price is secured by other liquid assets. Effecting a
               closing transaction also will permit a Fund to use the cash or
               proceeds from the concurrent sale of any securities subject to
               the option for other investments. If a Fund desires to sell a
               particular security from its portfolio on which it has written a
               call option, such Fund will effect a closing transaction prior to
               or concurrent with the sale of the security.
 
               A Fund will realize a profit from a closing transaction if the
               price of the purchase transaction is less than the premium
               received from writing the option or the price received from a
               sale transaction is more than the premium paid to buy the option.
               A Fund will realize a loss from a closing transaction if the
               price of the purchase transaction is more than the premium
               received from writing the option or the price received from a
               sale transaction is less than the premium paid to buy the option.
               Because increases in the market of a call option generally will
               reflect increases in the market price of the underlying security,
               any loss resulting from the repurchase of a call option is likely
               to be offset in whole or in part by appreciation of the
               underlying security owned by a Fund.
 
               An option position may be closed out only where a secondary
               market for an option of the same series exists. If a secondary
               market does not exist, the Fund may not be able to effect closing
               transactions in particular options and the Fund would have to
               exercise the options in order to realize any profit. If a Fund is
               unable to effect a closing purchase transaction in a secondary
               market, it will not be able to sell the underlying security until
               the option expires or it delivers the underlying security upon
               exercise. The absence of a liquid secondary market may be due to
               the following: (i) insufficient trading interest in certain
               options, (ii) restrictions imposed by a national securities
               exchange ("Exchange") on which the option is traded on opening or
               closing transactions or both, (iii) trading halts, suspensions or
               other restrictions imposed with respect to particular classes or
               series of options or underlying securities, (iv) unusual or
               unforeseen circumstances that interrupt normal operations on an
               Exchange, (v) the facilities of an Exchange or of the Options
               Clearing Corporation ("OCC") may not at all times be adequate to
               handle
 
 34
<PAGE> 
 
               current trading volume, or (vi) one or more Exchanges could, for
               economic or other reasons, decide or be compelled at some future
               date to discontinue the trading of options (or a particular class
               or series of options), in which event the secondary market on
               that Exchange (or in that class or series of options) would cease
               to exist, although outstanding options on that Exchange that had
               been issued by the OCC as a result of trades on that Exchange
               would continue to be exercisable in accordance with their terms.
 
               A Fund may write options in connection with buy-and-write
               transactions. In other words, a Fund may buy a security and then
               write a call option against that security. The exercise price of
               such call will depend upon the expected price movement of the
               underlying security. The exercise price of a call option may be
               below ("in-the-money"), equal to ("at-the-money") or above ("out-
               of-the-money") the current value of the underlying security at
               the time the option is written. Buy-and-write transactions using
               in-the-money call options may be used when it is expected that
               the price of the underlying security will remain flat or decline
               moderately during the option period. Buy-and-write transactions
               using at-the-money call options may be used when it is expected
               that the price of the underlying security will remain fixed or
               advance moderately during the option period. Buy-and-write
               transactions using out-of-the-money call options may be used when
               it is expected that the premiums received from writing the call
               option plus the appreciation in the market price of the
               underlying security up to the exercise price will be greater than
               the appreciation in the price of the underlying security alone.
               If the call options are exercised in such transactions, a Fund's
               maximum gain will be the premium received by it for writing the
               option, adjusted upwards or downwards by the difference between
               that Fund's purchase price of the security and the exercise
               price. If the options are not exercised and the price of the
               underlying security declines, the amount of such decline will be
               offset by the amount of premium received.
 
               The writing of covered put options is similar in terms of risk
               and return characteristics to buy-and-write transactions. If the
               market
 
                                                                              35
<PAGE> 
 
               price of the underlying security rises or otherwise is above the
               exercise price, the put option will expire worthless and a Fund's
               gain will be limited to the premium received. If the market price
               of the underlying security declines or otherwise is below the
               exercise price, a Fund may elect to close the position or take
               delivery of the security at the exercise price and that Fund's
               return will be the premium received from the put options minus
               the amount by which the market price of the security is below the
               exercise price.
 
               A Fund may buy put options to hedge against a decline in the
               value of its portfolio. By using put options in this way, a Fund
               will reduce any profit it might otherwise have realized in the
               underlying security by the amount of the premium paid for the put
               option and by transaction costs.
 
               A Fund may buy call options to hedge against an increase in the
               price of securities that it may buy in the future. The premium
               paid for the call option plus any transaction costs will reduce
               the benefit, if any, realized by such Fund upon exercise of the
               option, and, unless the price of the underlying security rises
               sufficiently, the option may expire worthless to that Fund.
 
               EURODOLLAR INSTRUMENTS. A Fund may make investments in Eurodollar
               instruments. Eurodollar instruments are U.S. dollar-denominated
               futures contracts or options thereon which are linked to the
               London Interbank Offered Rate ("LIBOR"), although foreign
               currency-denominated instruments are available from time to time.
               Eurodollar futures contracts enable purchasers to obtain a fixed
               rate for the lending of funds and sellers to obtain a fixed rate
               for borrowings. A Fund might use Eurodollar futures contracts and
               options thereon to hedge against changes in LIBOR, to which many
               interest rate swaps and fixed-income instruments are linked.
 
               SWAPS AND SWAP-RELATED PRODUCTS. A Fund may enter into interest
               rate swaps, caps and floors on either an asset-based or
               liability-based basis, depending upon whether it is hedging its
               assets or its liabilities, and will usually enter into interest
               rate swaps on a net basis (i.e., the two payment streams are
               netted out, with a Fund receiving or paying, as the case may be,
               only the
 
 36
<PAGE> 
 
               net amount of the two payments). The net amount of the excess, if
               any, of a Fund's obligations over its entitlement with respect to
               each interest rate swap will be calculated on a daily basis and
               an amount of cash or other liquid assets having an aggregate net
               asset value at least equal to the accrued excess will be
               maintained in a segregated account by the Funds' custodian. If a
               Fund enters into an interest rate swap on other than a net basis,
               it would maintain a segregated account in the full amount accrued
               on a daily basis of its obligations with respect to the swap. A
               Fund will not enter into any interest rate swap, cap or floor
               transaction unless the unsecured senior debt or the claims-paying
               ability of the other party thereto is rated in one of the three
               highest rating categories of at least one NRSRO at the time of
               entering into such transaction. Janus Capital will monitor the
               creditworthiness of all counterparties on an ongoing basis. If
               there is a default by the other party to such a transaction, a
               Fund will have contractual remedies pursuant to the agreements
               related to the transaction.
 
               The swap market has grown substantially in recent years with a
               large number of banks and investment banking firms acting both as
               principals and as agents utilizing standardized swap
               documentation. Janus Capital has determined that, as a result,
               the swap market has become relatively liquid. Caps and floors are
               more recent innovations for which standardized documentation has
               not yet been developed and, accordingly, they are less liquid
               than swaps. To the extent a Fund sells (i.e., writes) caps and
               floors, it will segregate cash or other liquid assets having an
               aggregate net asset value at least equal to the full amount,
               accrued on a daily basis, of its obligations with respect to any
               caps or floors.
 
               There is no limit on the amount of interest rate swap
               transactions that may be entered into by a Fund. These
               transactions may in some instances involve the delivery of
               securities or other underlying assets by a Fund or its
               counterparty to collateralize obligations under the swap. Under
               the documentation currently used in those markets, the risk of
               loss with respect to interest rate swaps is limited to the net
               amount of the payments that a Fund is contractually obligated to
               make. If the other party to an interest
 
                                                                              37
<PAGE> 
 
               rate swap that is not collateralized defaults, a Fund would risk
               the loss of the net amount of the payments that it contractually
               is entitled to receive. A Fund may buy and sell (i.e., write)
               caps and floors without limitation, subject to the segregation
               requirement described above.
 
               ADDITIONAL RISKS OF OPTIONS ON FOREIGN CURRENCIES, FORWARD
               CONTRACTS AND FOREIGN INSTRUMENTS. Unlike transactions entered
               into by the Funds in futures contracts, options on foreign
               currencies and forward contracts are not traded on contract
               markets regulated by the CFTC or (with the exception of certain
               foreign currency options) by the SEC. To the contrary, such
               instruments are traded through financial institutions acting as
               market-makers, although foreign currency options are also traded
               on certain Exchanges, such as the Philadelphia Stock Exchange and
               the Chicago Board Options Exchange, subject to SEC regulation.
               Similarly, options on currencies may be traded over-the-counter.
               In an over-the-counter trading environment, many of the
               protections afforded to Exchange participants will not be
               available. For example, there are no daily price fluctuation
               limits, and adverse market movements could therefore continue to
               an unlimited extent over a period of time. Although the buyer of
               an option cannot lose more than the amount of the premium plus
               related transaction costs, this entire amount could be lost.
               Moreover, an option writer and a buyer or seller of futures or
               forward contracts could lose amounts substantially in excess of
               any premium received or initial margin or collateral posted due
               to the potential additional margin and collateral requirements
               associated with such positions.
 
               Options on foreign currencies traded on Exchanges are within the
               jurisdiction of the SEC, as are other securities traded on
               Exchanges. As a result, many of the protections provided to
               traders on organized Exchanges will be available with respect to
               such transactions. In particular, all foreign currency option
               positions entered into on an Exchange are cleared and guaranteed
               by the OCC, thereby reducing the risk of counterparty default.
               Further, a liquid secondary market in options traded on an
               Exchange may be more readily available than in the over-the-
 
 38
<PAGE> 
 
               counter market, potentially permitting a Fund to liquidate open
               positions at a profit prior to exercise or expiration, or to
               limit losses in the event of adverse market movements.
 
               The purchase and sale of exchange-traded foreign currency
               options, however, is subject to the risks of the availability of
               a liquid secondary market described above, as well as the risks
               regarding adverse market movements, margining of options written,
               the nature of the foreign currency market, possible intervention
               by governmental authorities and the effects of other political
               and economic events. In addition, exchange-traded options on
               foreign currencies involve certain risks not presented by the
               over-the-counter market. For example, exercise and settlement of
               such options must be made exclusively through the OCC, which has
               established banking relationships in applicable foreign countries
               for this purpose. As a result, the OCC may, if it determines that
               foreign governmental restrictions or taxes would prevent the
               orderly settlement of foreign currency option exercises, or would
               result in undue burdens on the OCC or its clearing member, impose
               special procedures on exercise and settlement, such as technical
               changes in the mechanics of delivery of currency, the fixing of
               dollar settlement prices or prohibitions on exercise.
 
               In addition, options on U.S. government securities, futures
               contracts, options on futures contracts, forward contracts and
               options on foreign currencies may be traded on foreign exchanges
               and over-the-counter in foreign countries. Such transactions are
               subject to the risk of governmental actions affecting trading in
               or the prices of foreign currencies or securities. The value of
               such positions also could be adversely affected by (i) other
               complex foreign political and economic factors, (ii) lesser
               availability than in the United States of data on which to make
               trading decisions, (iii) delays in a Fund's ability to act upon
               economic events occurring in foreign markets during non-business
               hours in the United States, (iv) the imposition of different
               exercise and settlement terms and procedures and margin
               requirements than in the United States, and (v) low trading
               volume.
 
                                                                              39
<PAGE> 
Investment adviser
 
   
               As stated in the Prospectuses, each Fund has an Investment
               Advisory Agreement with Janus Capital, 100 Fillmore Street,
               Denver, Colorado 80206-4928. Each Advisory Agreement provides
               that Janus Capital will furnish continuous advice and
               recommendations concerning the Funds' investments, provide office
               space for the Funds, and pay the salaries, fees and expenses of
               all Fund officers and of those Trustees who are affiliated with
               Janus Capital. Janus Capital also may make payments to selected
               broker-dealer firms or institutions which perform recordkeeping
               or other services with respect to shareholder accounts. The
               minimum aggregate size required for eligibility for such
               payments, and the factors in selecting the broker-dealer firms
               and institutions to which they will be made, are determined from
               time to time by Janus Capital. Janus Capital is also authorized
               to perform the management and administrative services necessary
               for the operation of the Funds.
    
 
               The Funds pay custodian and transfer agent fees and expenses,
               brokerage commissions and dealer spreads and other expenses in
               connection with the execution of portfolio transactions, legal
               and accounting expenses, interest and taxes, registration fees,
               expenses of shareholders' meetings and reports to shareholders,
               fees and expenses of Trustees who are not affiliated with Janus
               Capital, costs of preparing, printing and mailing the Funds'
               Prospectuses and SAI to current shareholders, and other costs of
               complying with applicable laws regulating the sale of Fund
               shares. Pursuant to the Advisory Agreements, Janus Capital
               furnishes certain other services, including net asset value
               determination and fund accounting, recordkeeping, and blue sky
               registration and monitoring services, for which the Funds may
               reimburse Janus Capital for its costs.
 
               Janus Fund, Janus Enterprise Fund, Janus Mercury Fund, Janus
               Olympus Fund, Janus Special Situations Fund, Janus Twenty Fund,
               Janus Global Life Sciences Fund, Janus Global Technology Fund,
               Janus Worldwide Fund, Janus Balanced Fund, Janus Equity Income
               Fund and Janus Growth and Income Fund have each agreed to
               compensate Janus Capital for its services by the monthly payment
               of a fee at the annual rate of 0.75% of the first
 
 40
<PAGE> 
 
               $300 million of the average daily net assets of each Fund, 0.70%
               of the next $200 million of the average daily net assets of each
               Fund and 0.65% on the average daily net assets of each Fund in
               excess of $500 million.
 
               Janus High Yield Fund has agreed to compensate Janus Capital for
               its services by the monthly payment of a fee at the annual rate
               of 0.75% of the first $300 million of average daily net assets of
               the Fund and 0.65% of the average daily net assets in excess of
               $300 million. Janus Flexible Income Fund and Janus Short-Term
               Bond Fund have each agreed to compensate Janus Capital for its
               services by the monthly payment of a fee at the annual rate of
               0.65% of the first $300 million of the average daily net assets
               of the Fund, plus 0.55% of the average daily net assets of the
               Fund in excess of $300 million. Janus Federal Tax-Exempt Fund has
               agreed to compensate Janus Capital for its services by the
               monthly payment of a fee at the annual rate of 0.60% of the first
               $300 million of average daily net assets of the Fund and 0.55% of
               the average daily net assets in excess of $300 million. Janus
               Capital has agreed to waive the advisory fee payable by any of
               these Funds in an amount equal to the amount, if any, that such
               Fund's normal operating expenses chargeable to its income account
               in any fiscal year, including the investment advisory fee but
               excluding brokerage commissions, interest, taxes and
               extraordinary expenses, exceed 1% of the average daily net assets
               for a fiscal year for Janus Flexible Income Fund and Janus
               High-Yield Fund and 0.65% of the average daily net assets for a
               fiscal year for Janus Short-Term Bond Fund and Janus Federal
               Tax-Exempt Fund.
 
                                                                              41
<PAGE> 
 
               The following table summarizes the advisory fees paid by the
               Funds and any advisory fee waivers for the last three fiscal
               periods of each Fund. The information below is for fiscal years
               ended October 31.
 
   
<TABLE>
<CAPTION>
                                 1998                       1997                       1996
                       ------------------------   ------------------------   ------------------------
      Fund Name        Advisory Fees    Waiver    Advisory Fees    Waiver    Advisory Fees    Waiver
- -----------------------------------------------------------------------------------------------------
<S>                    <C>             <C>        <C>             <C>        <C>             <C>
Janus Fund             $135,223,467           -   $114,245,282           -    $89,848,418           -
Janus Enterprise Fund  $  3,982,454           -   $  4,438,870           -    $ 4,348,549           -
Janus Mercury Fund     $ 14,070,962           -   $ 13,721,557           -    $12,407,830           -
Janus Olympus Fund     $  5,433,827           -   $  3,801,421           -    $ 1,783,296(3)        -
Janus Special
  Situations Fund      $  5,040,157           -   $  1,090,013(4)        -            N/A           -
Janus Twenty Fund      $ 52,476,576           -   $ 32,875,794           -    $22,477,667           -
Janus Global Life
  Sciences Fund(1)              N/A           -            N/A           -            N/A           -
Janus Global
  Technology Fund(1)            N/A           -            N/A           -            N/A           -
Janus Worldwide Fund   $ 85,269,327           -   $ 51,015,512           -    $19,645,721           -
Janus Balanced Fund    $  3,869,978           -   $  2,167,710           -    $ 1,264,551           -
Janus Equity Income
  Fund                 $  1,002,095           -   $    394,962           -    $    71,858(2)        -
Janus Growth and
  Income Fund          $ 16,512,709           -   $  9,650,498           -    $ 5,501,734           -
Janus Flexible Income
  Fund                 $  5,210,692           -   $  3,910,319           -    $ 3,620,317           -
Janus High-Yield Fund  $  2,772,932           -   $  1,993,630    $ 18,746    $   556,207(3) $122,504
Janus Federal Tax-
  Exempt Fund          $    444,799    $236,058   $    321,447    $236,762    $   217,873    $167,598
Janus Short-Term Bond
  Fund                 $    582,112    $354,262   $    314,737    $258,118    $   274,319    $238,092
</TABLE>
    
 
(1) The Fund had not commenced operations as of October 31, 1998.
(2) June 28, 1996 (inception) to October 31, 1996.
(3) December 29, 1995 (inception) to October 31, 1996.
(4) December 31, 1996 (inception) to October 31, 1997.
 
               The Advisory Agreement for each of the Funds is dated July 1,
               1997 (except Janus Global Life Sciences Fund and Janus Global
               Technology Fund which are dated September 14, 1998). Each
               Advisory Agreement will continue in effect until July 1, 1999
               (except Janus Global Life Sciences Fund's and Janus Global
 
 42
<PAGE> 
 
               Technology Fund's agreements which will continue in effect until
               July 1, 2000), and thereafter from year to year so long as such
               continuance is approved annually by a majority of the Funds'
               Trustees who are not parties to the Advisory Agreements or
               interested persons of any such party, and by either a majority of
               the outstanding voting shares or the Trustees of the Funds. Each
               Advisory Agreement (i) may be terminated without the payment of
               any penalty by a Fund or Janus Capital on 60 days' written
               notice; (ii) terminates automatically in the event of its
               assignment; and (iii) generally, may not be amended without the
               approval by vote of a majority of the Trustees of the affected
               Fund, including the Trustees who are not interested persons of
               that Fund or Janus Capital and, to the extent required by the
               1940 Act, the vote of a majority of the outstanding voting
               securities of that Fund.
 
               Janus Capital acts as sub-adviser for a number of private-label
               mutual funds and provides separate account advisory services for
               institutional accounts. Investment decisions for each account
               managed by Janus Capital, including the Funds, are made
               independently from those for any other account that is or may in
               the future become managed by Janus Capital or its affiliates. If,
               however, a number of accounts managed by Janus Capital are
               contemporaneously engaged in the purchase or sale of the same
               security, the orders may be aggregated and/or the transactions
               may be averaged as to price and allocated equitably to each
               account. In some cases, this policy might adversely affect the
               price paid or received by an account or the size of the position
               obtained or liquidated for an account. Pursuant to an exemptive
               order granted by the SEC, the Funds and other funds advised by
               Janus Capital may also transfer daily uninvested cash balances
               into one or more joint trading accounts. Assets in the joint
               trading accounts are invested in money market instruments and the
               proceeds are allocated to the participating funds on a pro rata
               basis.
 
               Kansas City Southern Industries, Inc. ("KCSI") owns approximately
               82% of the outstanding voting stock of Janus Capital, most of
               which it acquired in 1984. KCSI is a publicly traded holding
               company whose primary subsidiaries are engaged in transporta-
 
                                                                              43
<PAGE> 
 
               tion, information processing and financial services. Thomas H.
               Bailey, President and Chairman of the Board of Janus Capital,
               owns approximately 12% of its voting stock and, by agreement with
               KCSI, selects a majority of Janus Capital's Board.
 
               KCSI has announced its intention to separate its transportation
               and financial services businesses. KCSI is currently studying
               alternatives for completion of the separation that meet its
               business objectives without risking adverse tax consequences.
               KCSI expects completion of the separation to be contemplated in
               1999.
 
               Each account managed by Janus Capital has its own investment
               objective and policies and is managed accordingly by a particular
               portfolio manager or team of portfolio managers. As a result,
               from time to time two or more different managed accounts may
               pursue divergent investment strategies with respect to
               investments or categories of investments.
 
               Janus Capital does not permit the Funds' portfolio managers to
               purchase and sell securities for their own accounts except under
               the limited exceptions contained in Janus Capital's policy
               regarding personal investing by directors/Trustees, officers and
               employees of Janus Capital and the Trust. The policy requires
               investment personnel and officers of Janus Capital, inside
               directors/Trustees of Janus Capital and the Funds and other
               designated persons deemed to have access to current trading
               information to pre-clear all transactions in securities not
               otherwise exempt under the policy. Requests for trading authority
               will be denied when, among other reasons, the proposed personal
               transaction would be contrary to the provisions of the policy or
               would be deemed to adversely affect any transaction then known to
               be under consideration for or to have been effected on behalf of
               any client account, including the Funds.
 
               In addition to the pre-clearance requirement described above, the
               policy subjects investment personnel, officers and directors/
               Trustees of Janus Capital and the Trust to various trading
               restrictions and reporting obligations. All reportable
               transactions are required to be reviewed for compliance with
               Janus Capital's
 
 44
<PAGE> 
 
               policy. Those persons also may be required under certain
               circumstances to forfeit their profits made from personal
               trading.
 
               The provisions of the policy are administered by and subject to
               exceptions authorized by Janus Capital.
 
                                                                              45
<PAGE> 
   
Custodian, transfer agent and 
           certain affiliations
    
 
               State Street Bank and Trust Company, P.O. Box 0351, Boston,
               Massachusetts 02117-0351 is the custodian of the domestic
               securities and cash of the Fund. State Street and the foreign
               subcustodians selected by it and approved by the Trustees have
               custody of the assets of the Funds held outside the U.S. and cash
               incidental thereto. The custodian and subcustodians hold the
               Funds' assets in safekeeping and collect and remit the income
               thereon, subject to the instructions of each Fund.
 
               Janus Service Corporation, P.O. Box 173375, Denver, Colorado
               80217-3375, a wholly-owned subsidiary of Janus Capital, is the
               Funds' transfer agent. In addition, Janus Service provides
               certain other administrative, recordkeeping and shareholder
               relations services to the Funds. For transfer agency and other
               services, Janus Service receives a fee calculated at an annual
               rate of 0.16% of average net assets of each Fund and, in
               addition, $4 per open shareholder account in each Fund except
               Janus Fund. In addition, the Funds pay DST Systems, Inc. ("DST"),
               a subsidiary of KCSI, license fees at the rate of $3.06 per
               shareholder account for the growth and combination funds and
               $3.98 per shareholder account for the fixed-income funds for the
               use of DST's shareholder accounting system. The Funds also pay
               DST $1.10 per closed shareholder account. The Funds pay DST for
               the use of its portfolio and fund accounting system a monthly
               base fee of $250 to $1,250 per month based on the number of Janus
               funds using the system and an asset charge of $1 per million
               dollars of net assets (not to exceed $500 per month). In
               addition, the Funds pay DST postage and forms costs of a DST
               affiliate incurred in mailing Fund shareholder transaction
               confirmations.
 
               The Trustees have authorized the Funds to use another affiliate
               of DST as introducing broker for certain Fund portfolio
               transactions as a means to reduce Fund expenses through credits
               against the charges of DST and its affiliates with regard to
               commissions earned by such affiliate. See "Portfolio Transactions
               and Brokerage."
 
               Janus Distributors, Inc., 100 Fillmore Street, Denver, Colorado
               80206-4928, a wholly-owned subsidiary of Janus Capital, is a
 
 46
<PAGE> 
 
               distributor of the Funds. Janus Distributors is registered as a
               broker-dealer under the Securities Exchange Act of 1934 and is a
               member of the National Association of Securities Dealers, Inc.
               Janus Distributors acts as the agent of the Funds in connection
               with the sale of their shares in all states in which the shares
               are registered and in which Janus Distributors is qualified as a
               broker-dealer. Under the Distribution Agreement, Janus
               Distributors continuously offers the Funds' shares and accepts
               orders at net asset value. No sales charges are paid by
               investors. Promotional expenses in connection with offers and
               sales of shares are paid by Janus Capital.
 
                                                                              47
<PAGE> 
Portfolio transactions and brokerage
 
               Decisions as to the assignment of portfolio business for the
               Funds and negotiation of its commission rates are made by Janus
               Capital, whose policy is to obtain the "best execution" (prompt
               and reliable execution at the most favorable security price) of
               all portfolio transactions. The Funds may trade foreign
               securities in foreign countries because the best available market
               for these securities is often on foreign exchanges. In
               transactions on foreign stock exchanges, brokers' commissions are
               frequently fixed and are often higher than in the United States,
               where commissions are negotiated.
 
               In selecting brokers and dealers and in negotiating commissions,
               Janus Capital considers a number of factors, including but not
               limited to: Janus Capital's knowledge of currently available
               negotiated commission rates or prices of securities currently
               available and other current transaction costs; the nature of the
               security being traded; the size and type of the transaction; the
               nature and character of the markets for the security to be
               purchased or sold; the desired timing of the trade; the activity
               existing and expected in the market for the particular security;
               confidentiality; the quality of the execution, clearance and
               settlement services; financial stability of the broker or dealer;
               the existence of actual or apparent operational problems of any
               broker or dealer; rebates of commissions by a broker to a Fund or
               to a third party service provider to the Fund to pay Fund
               expenses; and research products or services provided. In
               recognition of the value of the foregoing factors, Janus Capital
               may place portfolio transactions with a broker or dealer with
               whom it has negotiated a commission that is in excess of the
               commission another broker or dealer would have charged for
               effecting that transaction if Janus Capital determines in good
               faith that such amount of commission was reasonable in relation
               to the value of the brokerage and research provided by such
               broker or dealer viewed in terms of either that particular
               transaction or of the overall responsibilities of Janus Capital.
               Research may include furnishing advice, either directly or
               through publications or writings, as to the value of securities,
               the advisability of purchasing or selling specific securities and
               the availability of securities or purchasers or sellers of
               securities; furnishing seminars, information, analyses and
 
 48
<PAGE> 
 
               reports concerning issuers, industries, securities, trading
               markets and methods, legislative developments, changes in
               accounting practices, economic factors and trends and portfolio
               strategy; access to research analysts, corporate management
               personnel, industry experts, economists and government officials;
               comparative performance evaluation and technical measurement
               services and quotation services, and products and other services
               (such as third party publications, reports and analyses, and
               computer and electronic access, equipment, software, information
               and accessories that deliver, process or otherwise utilize
               information, including the research described above) that assist
               Janus Capital in carrying out its responsibilities. Research
               received from brokers or dealers is supplemental to Janus
               Capital's own research efforts. Most brokers and dealers used by
               Janus Capital provide research and other services described
               above.
 
               For the year ended October 31, 1998, the total brokerage
               commissions paid by the Funds to brokers and dealers in
               transactions identified for execution primarily on the basis of
               research and other services provided to the Funds are summarized
               below:
 
   
<TABLE>
<CAPTION>
                        Fund Name                          Commissions    Transactions
- ---------------------------------------------------------------------------------------
<S>                                                        <C>           <C>
Janus Fund                                                 $9,507,495    $9,765,974,357
Janus Enterprise Fund                                      $  445,410    $  349,429,266
Janus Mercury Fund                                         $1,159,118    $1,070,596,847
Janus Olympus Fund                                         $  269,118    $  245,178,152
Janus Special Situations Fund                              $  379,217    $  246,365,009
Janus Twenty Fund                                          $2,611,302    $2,933,293,562
Janus Global Life Sciences Fund(1)                                N/A               N/A
Janus Global Technology Fund(1)                                   N/A               N/A
Janus Worldwide Fund                                       $1,883,915    $1,252,006,241
Janus Balanced Fund                                        $  118,210    $  100,895,837
Janus Equity Income Fund                                   $   51,202    $   46,376,244
Janus Growth and Income Fund                               $1,157,382    $1,074,570,353
</TABLE>
    
 
(1) The Fund had not commenced operations as of October 31, 1998.
Note: Funds that are not included in the table did not pay any commissions
      related to research for the stated period.
 
                                                                              49
<PAGE> 
 
               Janus Capital may use research products and services in servicing
               other accounts in addition to the Funds. If Janus Capital
               determines that any research product or service has a mixed use,
               such that it also serves functions that do not assist in the
               investment decision-making process, Janus Capital may allocate
               the costs of such service or product accordingly. Only that
               portion of the product or service that Janus Capital determines
               will assist it in the investment decision-making process may be
               paid for in brokerage commission dollars. Such allocation may
               create a conflict of interest for Janus Capital.
 
               Janus Capital does not enter into agreements with any brokers
               regarding the placement of securities transactions because of the
               research services they provide. It does, however, have an
               internal procedure for allocating transactions in a manner
               consistent with its execution policy to brokers that it has
               identified as providing superior execution and research,
               research-related products or services which benefit its advisory
               clients, including the Funds. Research products and services
               incidental to effecting securities transactions furnished by
               brokers or dealers may be used in servicing any or all of Janus
               Capital's clients and such research may not necessarily be used
               by Janus Capital in connection with the accounts which paid
               commissions to the broker-dealer providing such research products
               and services.
 
               Janus Capital may consider sales of Fund shares by a broker-
               dealer or the recommendation of a broker-dealer to its customers
               that they purchase Fund shares as a factor in the selection of
               broker-dealers to execute Fund portfolio transactions. Janus
               Capital may also consider payments made by brokers effecting
               transactions for a Fund i) to the Fund or ii) to other persons on
               behalf of the Fund for services provided to the Fund for which it
               would be obligated to pay. In placing portfolio business with
               such broker-dealers, Janus Capital will seek the best execution
               of each transaction.
 
               When the Funds purchase or sell a security in the over-the-
               counter market, the transaction takes place directly with a
               principal market-maker, without the use of a broker, except in
 
 50
<PAGE> 
 
               those circumstances where in the opinion of Janus Capital better
               prices and executions will be achieved through the use of a
               broker.
 
               The Funds' Trustees have authorized Janus Capital to place
               transactions with DST Securities, Inc. ("DSTS"), a wholly-owned
               broker-dealer subsidiary of DST. Janus Capital may do so if it
               reasonably believes that the quality of the transaction and the
               associated commission are fair and reasonable and if, overall,
               the associated transaction costs, net of any credits described
               above under "Custodian, Transfer Agent and Certain Affiliations,"
               are lower than those that would otherwise be incurred.
 
                                                                              51
<PAGE> 
 
               The following table lists the total amount of brokerage
               commissions paid by each Fund for the fiscal periods ending on
               October 31st of each year:
 
   
<TABLE>
<CAPTION>
                  Fund Name                       1998          1997          1996
- --------------------------------------------------------------------------------------
<S>                                            <C>           <C>           <C>
Janus Fund                                     $28,468,686   $44,265,867   $29,000,380
Janus Enterprise Fund                          $ 1,281,067   $ 1,366,558   $ 1,188,690
Janus Mercury Fund                             $ 3,829,712   $ 5,379,505   $ 5,337,713
Janus Olympus Fund                             $ 1,285,709   $ 1,188,032   $   713,190(2)
Janus Special Situations Fund                  $ 2,183,339   $   833,811(3)           -
Janus Twenty Fund                              $ 6,924,862   $ 8,145,093   $ 7,346,447
Janus Global Life Sciences Fund(4)                     N/A             -             -
Janus Global Technology Fund(4)                        N/A             -             -
Janus Worldwide Fund                           $32,987,352   $26,537,096   $10,947,924
Janus Balanced Fund                            $   471,225   $   642,234   $    64,843
Janus Equity Income Fund                       $   218,190   $   179,800   $    63,683(1)
Janus Growth and Income Fund                   $ 3,923,528   $ 3,401,847   $ 1,985,334
Janus Flexible Income Fund                     $    35,152   $    35,674   $    15,386
Janus High-Yield Fund                          $   101,250   $    55,654   $    39,981(2)
Janus Federal Tax-Exempt Fund                  $    11,882             -             -
Janus Short-Term Bond Fund                     $       500   $     3,092             -
</TABLE>
    
 
(1) June 28, 1996 (inception) to October 31, 1996.
(2) December 29, 1995 (inception) to October 31, 1996.
(3) December 31, 1996 (inception) to October 31, 1997.
(4) The Fund had not commenced operations as of October 31, 1998.
Note: Funds that are not included in the table did not pay brokerage commissions
      because securities transactions for such Funds involved dealers acting as
      principals.
 
 52
<PAGE> 
 
               Included in such brokerage commissions are the following amounts
               paid to DSTS, which served to reduce each Fund's out-of-pocket
               expenses as follows:
 
   
<TABLE>
<CAPTION>
                                    Commission Paid
                                  through DSTS for the
                                      Period Ended       Reduction of    % of Total     % of Total
           Fund Name               October 31, 1998*      Expenses*     Commissions+   Transactions
- ----------------------------------------------------------------------------------------------------
<S>                               <C>                    <C>            <C>            <C>
Janus Fund                              $517,147           $387,860        1.82%           1.44%
Janus Enterprise Fund                   $  9,121           $  6,841         .71%            .67%
Janus Mercury Fund                      $ 17,664           $ 13,248         .46%            .51%
Janus Olympus Fund                      $ 12,268           $  9,201         .95%           1.20%
Janus Special Situations Fund           $ 21,682           $ 16,262         .99%            .85%
Janus Twenty Fund                       $ 45,075           $ 33,807         .65%            .95%
Janus Worldwide Fund                    $ 54,582           $ 40,937         .17%            .29%
Janus Balanced Fund                     $  9,864           $  7,398        2.09%           1.22%
Janus Equity Income Fund                $  1,944           $  1,458         .89%            .74%
Janus Growth and Income Fund            $ 70,167           $ 52,625        1.79%           1.42%
</TABLE>
    
 
Note: Funds that did not execute trades with DSTS during the stated period are
not included in the table.
 
<TABLE>
<CAPTION>
                             Commission Paid                           Commission
                           through DSTS for the                    Paid through DSTS
                               Period Ended       Reduction of    for the Period Ended     Reduction
        Fund Name           October 31, 1997*      Expenses*       October 31, 1996*      of Expenses*
- ------------------------------------------------------------------------------------------------------
<S>                        <C>                    <C>            <C>                      <C>
Janus Fund                      $1,118,869          $839,152           $  470,414           $352,810
Janus Enterprise Fund           $   33,551          $ 28,388           $   11,030           $  8,273
Janus Mercury Fund              $   95,033          $ 71,275           $   88,645           $ 66,483
Janus Olympus Fund              $    5,922          $  4,442           $    1,117(2)        $    838
Janus Twenty Fund               $  177,408          $133,056           $  183,255           $137,441
Janus Worldwide Fund            $  177,943          $133,457           $  104,173           $ 78,130
Janus Balanced Fund             $    2,636          $  1,977           $    9,591           $  7,194
Janus Equity Income Fund        $    1,920          $  1,440           $       83(1)        $     62
Janus Growth and Income
  Fund                          $   76,575          $ 57,431           $   79,006           $ 59,254
</TABLE>
 
* The difference between commissions paid through DSTS and expenses reduced
  constitute commissions paid to an unaffiliated clearing broker.
+ Differences in the percentage of total commissions versus the percentage of
  total transactions is due, in part, to variations among share prices and
  number of shares traded, while average price per share commission rates were
  substantially the same.
(1) June 28, 1996 (inception) to October 31, 1996.
(2) December 29, 1995 (inception) to October 31, 1996.
Note: Funds that did not execute trades with DSTS during the stated periods are
not included in the table.
 
                                                                              53
<PAGE> 
 
               As of October 31, 1998, certain Funds owned securities of their
               regular broker-dealers (or parents), as shown below:
 
   
<TABLE>
<CAPTION>
                                                          Value of
                                      Name of            Securities
          Fund Name                Broker-Dealer           Owned
- --------------------------------------------------------------------
<S>                            <C>                      <C>
Janus Fund                     Charles Schwab Corp.     $407,513,667
Janus Enterprise Fund          Charles Schwab Corp.     $  7,242,973
Janus Growth and Income Fund   Charles Schwab Corp.     $ 23,968,750
Janus Balanced Fund            Charles Schwab Corp.     $ 14,388,920
Janus Short-Term Bond Fund     Merrill Lynch, Pierce
                               Fenner & Smith, Inc.     $  3,773,437
Janus Olympus Fund             Charles Schwab Corp.     $ 11,735,483
Janus Equity Income Fund       Charles Schwab Corp.     $  5,308,389
</TABLE>
    
 
 54
<PAGE> 
Trustees and officers
 
               The following are the names of the Trustees and officers of the
               Trust, together with a brief description of their principal
               occupations during the last five years. In August 1992, Janus
               Venture Fund, Inc. and Janus Twenty Fund, Inc. (both separate
               Maryland corporations) and the Janus Income Series (a
               Massachusetts business trust comprised of Janus Flexible Income
               Fund series) were reorganized into separate series of the Trust.
               In general, all references to Trust offices in this section
               include comparable offices with the respective predecessor funds,
               unless a Trust office was filled subsequent to the
               reorganization.
 
Thomas H. Bailey, Age 61 - Trustee, Chairman and President*#
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Trustee, Chairman and President of Janus Aspen Series. Chairman,
               Chief Executive Officer, Director and President of Janus Capital.
               Director of Janus Distributors, Inc.
 
James P. Craig, III, Age 42 - Trustee and Executive Vice President*#
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Trustee and Executive Vice President of Janus Aspen Series. Chief
               Investment Officer, Vice Chairman and Director of Janus Capital.
               Executive Vice President and Portfolio Manager of Janus Fund.
               Executive Vice President and Co-Manager of Janus Venture Fund.
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
#Member of the Trust's Executive Committee.
 
                                                                              55
<PAGE> 
 
Gary O. Loo, Age 58  - Trustee#
102 N. Cascade, Suite 500
Colorado Springs, CO 80903
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. President and Director of High
               Valley Group, Inc., Colorado Springs, CO (investments).
 
Dennis B. Mullen, Age 55 - Trustee
7500 E. McCormick Parkway, #24
Scottsdale, AZ 85258
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Private Investor. Formerly (1997-
               1998), Chief Financial Officer-Boston Market Concepts, Boston
               Chicken, Inc., Golden, CO (restaurant chain); (1993-1997),
               President and Chief Executive Officer of BC Northwest, L.P., a
               franchise of Boston Chicken, Inc., Bellevue, WA (restaurant
               chain).
 
James T. Rothe, Age 55 - Trustee
102 South Tejon Street, Suite 1100
Colorado Springs, CO 80903
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Professor of Business, University
               of Colorado, Colorado Springs, CO. Principal, Phillips-Smith
               Retail Group, Colorado Springs, CO (a venture capital firm).
               Formerly (1986-1994), Dean of the College of Business, University
               of Colorado, Colorado Springs, CO.
 
William D. Stewart, Age 54 - Trustee#
5330 Sterling Drive
Boulder, CO 80302
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. President of HPS Division of MKS
               Instruments, Boulder, CO (manufacturer of vacuum fittings and
               valves).
 
- --------------------------------------------------------------------------------
#Member of the Trust's Executive Committee.
 
 56
<PAGE> 
 
Martin H. Waldinger, Age 60 - Trustee
4940 Sandshore Court
San Diego, CA 92130
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Private Consultant. Formerly
               (1993-1996), Director of Run Technologies, Inc., a software
               development firm, San Carlos, CA.
 
David J. Corkins, Age 32 - Executive Vice President*+
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Portfolio Manager of Janus Growth
               and Income Fund. Executive Vice President of Janus Aspen Series.
               Vice President of Janus Capital. Formerly, research analyst and
               assistant portfolio manager at Janus Capital (1995-1997).
               Formerly, Chief Financial Officer of Chase U.S. Consumer
               Services, Inc., a Chase Manhattan mortgage business (1993-1995).
 
David C. Decker, Age 32 - Executive Vice President*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Portfolio Manager of Janus Special
               Situations Fund. Assistant Portfolio Manager of Janus Fund. Vice
               President of Janus Capital. Formerly, research analyst at Janus
               Capital (1992-1996).
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
+Mr. Corkins and Mr. Lammert are related by marriage.
 
                                                                              57
<PAGE> 
 
James P. Goff, Age 34 - Executive Vice President*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Portfolio Manager of Janus
               Enterprise Fund. Executive Vice President of Janus Aspen Series.
               Vice President of Janus Capital. Formerly, Executive Vice
               President and Portfolio Manager of Janus Venture Fund (December
               1993 to February 1997).
 
Helen Young Hayes, Age 36  - Executive Vice President*+
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Portfolio Manager of Janus Worldwide
               Fund. Executive Vice President and Co-Manager of Janus Overseas
               Fund. Executive Vice President of Janus Aspen Series. Vice
               President of Janus Capital.
 
Warren B. Lammert, Age 37 - Executive Vice President*++
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Portfolio Manager of Janus Mercury
               Fund. Vice President of Janus Capital. Formerly, Executive Vice
               President and Portfolio Manager of Janus Venture Fund (December
               1993-December 1996).
 
C. Mike Lu, Age 29 - Executive Vice President
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Portfolio Manager of Janus Global
               Technology Fund. Formerly, research analyst at Janus Capital
               (1991-1998).
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
+Ms. Hayes and Ms. Young are sisters.
++Mr. Lammert and Mr. Corkins are related by marriage.
 
 58
<PAGE> 
 
Thomas R. Malley, Age 30 - Executive Vice President*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Portfolio Manager of Janus Global
               Life Sciences Fund. Formerly, research analyst at Janus Capital
               (1991-1998).
 
Blaine P. Rollins, Age 31 - Executive Vice President*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Portfolio Manager of Janus Balanced
               Fund and Janus Equity Income Fund. Assistant Portfolio Manager of
               Janus Fund. Executive Vice President of Janus Aspen Series. Vice
               President of Janus Capital. Formerly, fixed-income trader and
               equity securities analyst at Janus Capital (1990-1995).
 
Sandy R. Rufenacht, Age 33 - Executive Vice President*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Portfolio Manager of Janus Short-
               Term Bond Fund and Janus High-Yield Fund. Executive Vice
               President of Janus Aspen Series. Vice President of Janus Capital.
               Formerly, Co-Manager of Janus Flexible Income Fund (June 1996-
               February 1998). Formerly senior accountant, fixed-income trader
               and fixed-income research analyst at Janus Capital (1990-1995).
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
 
                                                                              59
<PAGE> 
 
Scott W. Schoelzel, Age 40 - Executive Vice President*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Portfolio Manager of Janus Twenty
               Fund. Executive Vice President of Janus Aspen Series. Vice
               President of Janus Capital. Formerly (1995-1997), Executive Vice
               President and Portfolio Manager of Janus Olympus Fund. Formerly
               (January 1994-June 1995), Vice President of Investments at Janus
               Capital.
 
Ronald V. Speaker, Age 34 - Executive Vice President*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Portfolio Manager of Janus Flexible
               Income Fund. Executive Vice President of Janus Aspen Series. Vice
               President of Janus Capital. Formerly, Co-Manager of Janus High-
               Yield Fund (December 1995-February 1998). Formerly, Portfolio
               Manager of Janus Short-Term Bond Fund (September 1992-December
               1995) and Janus Federal Tax-Exempt Fund (May 1993-December 1995).
 
Darrell W. Watters, Age 35 - Executive Vice President*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Portfolio Manager of Janus Federal
               Tax-Exempt Fund. Executive Vice President of Janus Aspen Series.
               Vice President of Janus Capital. Formerly, municipal bond trader
               and research analyst at Janus Capital (1993-1995).
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
 
 60
<PAGE> 
 
Claire Young, Age 33 - Executive Vice President*+
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Portfolio Manager of Janus Olympus
               Fund. Vice President of Janus Capital. Formerly, research analyst
               and assistant portfolio manager at Janus Capital (1992-1997).
 
Thomas A. Early, Age 44 - Vice President and General Counsel*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Vice President and General Counsel of Janus Aspen Series. Vice
               President, General Counsel and Secretary of Janus Capital. Vice
               President and General Counsel of Janus Service Corporation, Janus
               Distributors, Inc. and Janus Capital International, Ltd. Director
               of Janus World Funds Plc. Formerly (1997-1998), Executive Vice
               President and General Counsel of Prudential Investments Fund
               Management LLC, Newark, NJ. Formerly (1994-1997), Vice President
               and General Counsel of Prudential Retirement Services, Newark,
               NJ. Formerly (1988-1994), Associate General Counsel and Chief
               Financial Services Counsel, Frank Russell Company, Tacoma, WA.
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
+Ms. Young and Ms. Hayes are sisters.
 
                                                                              61
<PAGE> 
 
Steven R. Goodbarn, Age 41 - Vice President and Chief Financial Officer*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Vice President and Chief Financial Officer of Janus Aspen Series.
               Vice President of Finance, Treasurer and Chief Financial Officer
               of Janus Capital, Janus Service Corporation and Janus
               Distributors, Inc. Director of Janus Service Corporation, Janus
               Distributors, Inc. and Janus World Funds Plc. Director, Treasurer
               and Vice President of Finance of Janus Capital International Ltd.
               Formerly (May 1992-January 1996), Treasurer of Janus Investment
               Fund and Janus Aspen Series.
 
Kelley Abbott Howes, Age 33 - Assistant Vice President and Secretary*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Assistant Vice President and Secretary of Janus Aspen Series.
               Director and President of Janus Distributors, Inc. Assistant Vice
               President and Associate Counsel of Janus Capital. Formerly (1990
               to 1994), with The Boston Company Advisors, Inc., Boston, MA
               (mutual fund administration services).
 
Glenn P. O'Flaherty, Age 40 - Treasurer and Chief Accounting Officer*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Treasurer and Chief Accounting Officer of Janus Aspen Series.
               Vice President of Janus Capital. Formerly (1991-1997) Director of
               Fund Accounting, Janus Capital.
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
 
 62
<PAGE> 
 
               The Trustees are responsible for major decisions relating to each
               Fund's objective, policies and techniques. The Trustees also
               supervise the operation of the Funds by their officers and review
               the investment decisions of the officers, although they do not
               actively participate on a regular basis in making such decisions.
 
               The Trust's Executive Committee shall have and may exercise all
               the powers and authority of the Trustees except for matters
               requiring action by all Trustees pursuant to the Trust's Bylaws
               or Agreement and Declaration of Trust, Massachusetts law or the
               1940 Act.
 
               The following table shows the aggregate compensation earned by
               and paid to each Trustee by the Funds described in this SAI and
               all funds advised and sponsored by Janus Capital (collectively,
               the "Janus Funds") for the periods indicated. None of the
               Trustees receives any pension or retirement benefits from the
               Funds or the Janus Funds.
 
   
<TABLE>
<CAPTION>
                                             Aggregate Compensation      Total Compensation
                                               from the Funds for     from the Janus Funds for
                                               fiscal year ended         calendar year ended
         Name of Person, Position               October 31, 1998         December 31, 1998**
<S>                                          <C>                      <C>
- -----------------------------------------------------------------------------------------------
Thomas H. Bailey, Chairman and Trustee*             $     0                    $     0
James P. Craig, Trustee*                            $     0                    $     0
William D. Stewart, Trustee                         $63,741                    $82,000
Gary O. Loo, Trustee                                $50,063                    $74,000
Dennis B. Mullen, Trustee                           $57,978                    $82,000
Martin H. Waldinger, Trustee                        $60,572                    $74,000
James T. Rothe, Trustee                             $58,504                    $82,000
</TABLE>
    
 
 * An interested person of the Funds and of Janus Capital. Compensated by Janus
   Capital and not the Funds.
** As of December 31, 1998, Janus Funds consisted of two registered investment
   companies comprised of a total of 32 funds.
 
                                                                              63
<PAGE> 
Purchase of shares
 
               Shares of the Funds are sold at the net asset value per share as
               determined at the close of the regular trading session of the New
               York Stock Exchange (the "NYSE") next occurring after a purchase
               order is received and accepted by a Fund. The Shareholder's
               Manual Section of the Prospectus contains detailed information
               about the purchase of shares.
 
NET ASSET VALUE DETERMINATION
 
   
               As stated in the Prospectuses, the net asset value ("NAV") of
               Fund shares is determined once each day on which the NYSE is
               open, at the close of its regular trading session (normally 4:00
               p.m., New York time, Monday through Friday). As stated in the
               Prospectus, the NAV of Fund shares is not determined on days the
               NYSE is closed (generally, New Year's Day, Martin Luther King
               Day, Presidents' Day, Good Friday, Memorial Day, Independence
               Day, Labor Day, Thanksgiving and Christmas). The per share NAV of
               each Fund is determined by dividing the total value of a Fund's
               securities and other assets, less liabilities, by the total
               number of shares outstanding. In determining NAV, securities
               listed on an Exchange, the NASDAQ National Market and foreign
               markets are valued at the closing prices on such markets, or if
               such price is lacking for the trading period immediately
               preceding the time of determination, such securities are valued
               at their current bid price. Municipal securities held by the
               Funds are traded primarily in the over-the-counter market.
               Valuations of such securities are furnished by one or more
               pricing services employed by the Funds and are based upon a
               computerized matrix system or appraisals obtained by a pricing
               service, in each case in reliance upon information concerning
               market transactions and quotations from recognized municipal
               securities dealers. Other securities that are traded on the
               over-the-counter market are valued at their closing bid prices.
               Foreign securities and currencies are converted to U.S. dollars
               using the exchange rate in effect at the close of the NYSE. Each
               Fund will determine the market value of individual securities
               held by it, by using prices provided by one or more professional
               pricing services which may provide market prices to other funds,
               or, as needed, by obtaining market quotations from independent
               broker-dealers. Short-term securities maturing within 60 days are
               valued on an amortized cost basis. Securities for which
               quotations
    
 
 64
<PAGE> 
 
               are not readily available, and other assets, are valued at fair
               values determined in good faith under procedures established by
               and under the supervision of the Trustees.
 
               Trading in securities on European and Far Eastern securities
               exchanges and over-the-counter markets is normally completed well
               before the close of business on each business day in New York
               (i.e., a day on which the NYSE is open). In addition, European or
               Far Eastern securities trading generally or in a particular
               country or countries may not take place on all business days in
               New York. Furthermore, trading takes place in Japanese markets on
               certain Saturdays and in various foreign markets on days which
               are not business days in New York and on which a Fund's NAV is
               not calculated. A Fund calculates its NAV per share, and
               therefore effects sales, redemptions and repurchases of its
               shares, as of the close of the NYSE once on each day on which the
               NYSE is open. Such calculation may not take place
               contemporaneously with the determination of the prices of the
               foreign portfolio securities used in such calculation.
 
REINVESTMENT OF DIVIDENDS AND DISTRIBUTIONS
 
               If investors do not elect in writing or by phone to receive their
               dividends and distributions in cash, all income dividends and
               capital gains distributions, if any, on a Fund's shares are
               reinvested automatically in additional shares of that Fund at the
               NAV determined on the payment date. Checks for cash dividends and
               distributions and confirmations of reinvestments are usually
               mailed to shareholders within ten days after the record date. Any
               election of the manner in which a shareholder wishes to receive
               dividends and distributions (which may be made on the New Account
               Application form or by phone) will apply to dividends and
               distributions the record dates of which fall on or after the date
               that a Fund receives such notice. Changes to distribution options
               must be received at least three days prior to the record date to
               be effective for such date. Investors receiving cash
               distributions and dividends may elect in writing or by phone to
               change back to automatic reinvestment at any time.
 
                                                                              65
<PAGE> 
Redemption of shares
 
               Procedures for redemption of shares are set forth in the
               Shareholder's Manual section of the Prospectuses. Shares normally
               will be redeemed for cash, although each Fund retains the right
               to redeem its shares in kind under unusual circumstances, in
               order to protect the interests of remaining shareholders, by
               delivery of securities selected from its assets at its
               discretion. However, the Funds are governed by Rule 18f-1 under
               the 1940 Act, which requires each Fund to redeem shares solely in
               cash up to the lesser of $250,000 or 1% of the NAV of that Fund
               during any 90-day period for any one shareholder. Should
               redemptions by any shareholder exceed such limitation, a Fund
               will have the option of redeeming the excess in cash or in kind.
               If shares are redeemed in kind, the redeeming shareholder might
               incur brokerage costs in converting the assets to cash. The
               method of valuing securities used to make redemptions in kind
               will be the same as the method of valuing portfolio securities
               described under "Purchase of Shares - Net Asset Value
               Determination" and such valuation will be made as of the same
               time the redemption price is determined.
 
               The right to require the Funds to redeem its shares may be
               suspended, or the date of payment may be postponed, whenever (1)
               trading on the NYSE is restricted, as determined by the SEC, or
               the NYSE is closed except for holidays and weekends, (2) the SEC
               permits such suspension and so orders, or (3) an emergency exists
               as determined by the SEC so that disposal of securities or
               determination of NAV is not reasonably practicable.
 
 66
<PAGE> 
Shareholder accounts
 
               Detailed information about the general procedures for shareholder
               accounts and specific types of accounts is set forth in the
               Prospectuses. Applications for specific types of accounts may be
               obtained by calling the Funds at 1-800-525-3713 or writing to the
               Funds at P.O. Box 173375, Denver, Colorado 80217-3375.
 
TELEPHONE TRANSACTIONS
 
               As stated in the Prospectuses, shareholders may initiate a number
               of transactions by telephone. The Funds, their transfer agent and
               their distributor disclaim responsibility for the authenticity of
               instructions received by telephone. Such entities will employ
               reasonable procedures to confirm that instructions communicated
               by telephone are genuine. Such procedures may include, among
               others, requiring personal identification prior to acting upon
               telephone instructions, providing written confirmation of the
               transactions and tape recording telephone conversations.
 
SYSTEMATIC REDEMPTIONS
 
               As stated in the Shareholder's Manual section of the
               Prospectuses, if you have a regular account or are eligible for
               distributions from a retirement plan, you may establish a
               systematic redemption option. The payments will be made from the
               proceeds of periodic redemptions of shares in the account at the
               NAV. Depending on the size or frequency of the disbursements
               requested, and the fluctuation in value of a Fund's portfolio,
               redemptions for the purpose of making such disbursements may
               reduce or even exhaust the shareholder's account. Either an
               investor or a Fund, by written notice to the other, may terminate
               the investor's systematic redemption option without penalty at
               any time.
 
               Information about requirements to establish a systematic
               redemption option may be obtained by writing or calling the Funds
               at the address or phone number shown above.
 
                                                                              67
<PAGE> 
Tax-deferred accounts
 
               The Funds offer several different types of tax-deferred accounts
               that an investor may establish to invest in Fund shares,
               depending on rules prescribed by the Code. Traditional and Roth
               Individual Retirement Accounts may be used by most individuals
               who have taxable compensation. Simplified Employee Pensions and
               Defined Contribution Plans (Profit Sharing or Money Purchase
               Pension Plans) may be used by most employers, including
               corporations, partnerships and sole proprietors, for the benefit
               of business owners and their employees. Education IRAs allow
               individuals, subject to certain income limitations, to contribute
               up to $500 annually on behalf of any child under the age of 18.
               In addition, the Funds offer a Section 403(b)(7) Plan for
               employees of educational organizations and other qualifying
               tax-exempt organizations. Investors should consult their tax
               adviser or legal counsel before selecting a tax-deferred account.
 
   
               Contributions under Traditional and Roth IRAs, Education IRAs,
               SEPs, Defined Contribution Plans and Section 403(b)(7) Plans are
               subject to specific contribution limitations. Generally, such
               contributions may be invested at the direction of the
               participant. The investment is then held by Investors Fiduciary
               Trust Company as custodian. Each participant's account is charged
               an annual fee of $12 per taxpayer identification number no matter
               how many tax-deferred accounts the participant has with Janus.
               The custodian reserves the right to change the amount of this fee
               or to waive it in whole or in part for certain types of accounts.
    
 
               Distributions from tax-deferred accounts may be subject to
               ordinary income tax and may be subject to an additional 10% tax
               if withdrawn prior to age 59 1/2 or used for a nonqualifying
               purpose. Additionally, shareholders generally must start
               withdrawing retirement plan assets no later than April 1 of the
               year after they reach age 70 1/2. Several exceptions to these
               general rules may apply and several methods exist to determine
               the amount and timing of the minimum annual distribution (if
               any). Shareholders should consult with their tax adviser or legal
               counsel prior to receiving any distribution from any tax-deferred
               account, in order to determine the income tax impact of any such
               distribution.
 
 68
<PAGE> 
 
               To receive additional information about Traditional and Roth
               IRAs, SEPs, Defined Contribution Plans and Section 403(b)(7)
               Plans along with the necessary materials to establish an account,
               please call the Funds at 1-800-525-3713 or write to the Funds at
               P.O. Box 173375, Denver, Colorado 80217-3375. No contribution to
               a Traditional or Roth IRA, SEP, Defined Contribution Plan or
               Section 403(b)(7) Plan can be made until the appropriate forms to
               establish any such plan have been completed.
 
                                                                              69
<PAGE> 
Income dividends, capital gains 
       distributions and tax status
 
               It is a policy of the Funds to make distributions of
               substantially all of their investment income and any net realized
               capital gains. Any capital gains realized during each fiscal year
               ended October 31, as defined by the Code, are normally declared
               and payable to shareholders in December. Janus Fund, Janus
               Enterprise Fund, Janus Mercury Fund, Janus Olympus Fund, Janus
               Special Situations Fund, Janus Twenty Fund, Janus Global Life
               Sciences Fund, Janus Global Technology Fund and Janus Worldwide
               Fund, declare and make annual distributions of income (if any);
               Janus Equity Income Fund, Janus Balanced Fund and Janus Growth
               and Income Fund declare and make quarterly distributions of
               income and Janus Flexible Income Fund, Janus High-Yield Fund,
               Janus Federal Tax-Exempt Fund and Janus Short-Term Bond Fund
               declare dividends daily and make monthly distributions of income.
               If a month begins on a Saturday, Sunday or holiday, dividends for
               daily dividend Funds for those days are declared at the end of
               the preceding month. Janus Federal Tax-Exempt Fund will use the
               "average annual method" to determine the designated percentage of
               each distribution that is tax-exempt. Under this method, the
               percentage of income designated as tax-exempt is based on the
               percentage of tax-exempt income earned for each annual period,
               and may be substantially different from the Fund's income that
               was tax-exempt during any monthly period. The Funds intend to
               qualify as regulated investment companies by satisfying certain
               requirements prescribed by Subchapter M of the Code. Accordingly,
               a Fund will invest no more than 25% of its total assets in a
               single issuer (other than U.S. government securities).
 
               The Funds may purchase securities of certain foreign corporations
               considered to be passive foreign investment companies by the IRS.
               In order to avoid taxes and interest that must be paid by the
               Funds if these instruments are profitable, the Funds may make
               various elections permitted by the tax laws. However, these
               elections could require that the Funds recognize taxable income,
               which in turn must be distributed.
 
               Some foreign securities purchased by the Funds may be subject to
               foreign taxes which could reduce the yield on such securities.
               The amount of such foreign taxes is expected to be insignificant.
               The
 
 70
<PAGE> 
 
               Funds may from year to year make the election permitted under
               section 853 of the Code to pass through such taxes to
               shareholders, who will each decide whether to deduct such taxes
               or claim a foreign tax credit. If such election is not made,
               foreign taxes paid or accrued will represent an expense to each
               Fund which will reduce its investment company taxable income.
 
                                                                              71
<PAGE> 
Principal shareholders
 
   
               As of January 20, 1999, the officers and Trustees of the Funds as
               a group owned less than 1% of the outstanding shares of each of
               the Funds. In addition, as of January 20, 1999, Charles Schwab &
               Co., Inc. ("Schwab"), 101 Montgomery Street, San Francisco, CA
               94104-4122, and National Financial Services Co. ("National
               Financial"), P.O. Box 3908, Church Street Station, New York, NY
               10008-3908, owned of record 5% or more of the outstanding shares
               of the Funds, as shown below:
    
 
   
<TABLE>
<CAPTION>
                         Fund Name                            Held by Schwab
- ----------------------------------------------------------------------------
<S>                                                           <C>
Janus Fund..................................................      14.16%
Janus Enterprise Fund.......................................      15.74%
Janus Mercury Fund..........................................      15.76%
Janus Olympus Fund..........................................      27.33%
Janus Special Situations Fund...............................      15.85%
Janus Twenty Fund...........................................      13.57%
Janus Global Life Sciences Fund.............................      29.79%
Janus Worldwide Fund........................................      24.67%
Janus Balanced Fund.........................................      22.68%
Janus Equity Income Fund....................................      30.55%
Janus Growth and Income Fund................................      17.25%
Janus Flexible Income Fund..................................      36.12%
Janus High-Yield Fund.......................................      33.61%
Janus Federal Tax-Exempt Fund...............................      13.60%
Janus Short-Term Bond Fund..................................      13.72%
- ----------------------------------------------------------------------------
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                       Fund Name                         Held by National Financial
- -----------------------------------------------------------------------------------
<S>                                                      <C>
Janus Mercury Fund.....................................             5.07%
Janus Olympus Fund.....................................            10.19%
Janus Special Situations Fund..........................             7.17%
Janus Twenty Fund......................................             9.45%
Janus Global Life Sciences Fund........................             6.30%
Janus Worldwide Fund...................................            10.26%
Janus Balanced Fund....................................             9.03%
Janus Equity Income Fund...............................            11.08%
Janus Growth and Income Fund...........................             6.99%
Janus Flexible Income Fund.............................             8.80%
Janus High-Yield Fund..................................            13.39%
- -----------------------------------------------------------------------------------
</TABLE>
    
 
 72
<PAGE> 
 
   
               According to information provided by Schwab and National
               Financial, this ownership is by nominee only and does not
               represent beneficial ownership of such shares, because they have
               no investment discretion or voting power with respect to such
               shares.
    
 
   
               In addition, as of January 20, 1999, more than 5% of the
               outstanding shares of the following Fund was owned of record by
               the shareholder listed below:
    
 
   
<TABLE>
<CAPTION>
                                       Shareholder and
Fund                                  Address of Record       Percentage Ownership
- ----------------------------------------------------------------------------------
<S>                                <C>                        <C>
Janus Worldwide Fund               FIIOC                              5.87%
                                   100 Magellan Way
                                   Covington, KY 41015-1987
- ----------------------------------------------------------------------------------
</TABLE>
    
 
   
               To the knowledge of the Funds, no other shareholder owned more
               than 5% of the outstanding shares of any Fund as of January 20,
               1999.
    
 
                                                                              73
<PAGE> 
Miscellaneous information
 
               Each Fund is a series of the Trust, a Massachusetts business
               trust that was created on February 11, 1986. The Trust is an
               open-end management investment company registered under the 1940
               Act. As of the date of this SAI, the Trust offers 21 separate
               series, three of which currently offer three classes of shares.
               On June 16, 1986, the Trust assumed all the assets and
               liabilities of its predecessor corporation, Janus Fund, Inc.,
               which was incorporated under the laws of Maryland on September
               18, 1968. All references in this SAI to Janus Fund and all
               financial and other information about Janus Fund prior to June
               16, 1986, are to the former Janus Fund, Inc.; all references
               after June 16, 1986 are to the Janus Fund series of the Trust.
 
               On August 7, 1992, in a tax-free reorganization, the Trust
               assumed all the assets and liabilities of (i) the Janus Flexible
               Income Fund series of Janus Income Series, a separate
               Massachusetts business trust created on May 28, 1986; and (ii)
               Janus Twenty Fund, Inc., a Maryland corporation originally
               incorporated as Janus Value Fund in 1984. Shareholders received
               shares of the series of the Trust equal both in number and net
               asset value to their shares of the respective predecessor entity.
               In connection with the reorganization, Janus Flexible Income Fund
               changed its fiscal year end from December 31 to October 31. All
               references in this SAI to Janus Flexible Income Fund and Janus
               Twenty Fund, and all financial and other information about such
               Funds prior to August 7, 1992, are to the respective predecessor
               entities; all references after August 7, 1992, are to the
               respective series of the Trust.
 
               Janus Capital reserves the right to the name "Janus." In the
               event that Janus Capital does not continue to provide investment
               advice to the Funds, the Funds must cease to use the name "Janus"
               as soon as reasonably practicable.
 
               Under Massachusetts law, shareholders of the Funds could, under
               certain circumstances, be held liable for the obligations of
               their Fund. However, the Declaration of Trust disclaims
               shareholder liability for acts or obligations of the Funds and
               requires that notice of this disclaimer be given in each
               agreement, obligation or instrument entered into or executed by
               the Funds or the Trustees.
 
 74
<PAGE> 
 
               The Declaration of Trust also provides for indemnification from
               the assets of the Funds for all losses and expenses of any Fund
               shareholder held liable for the obligations of their Fund. Thus,
               the risk of a shareholder incurring a financial loss on account
               of its liability as a shareholder of one of the Funds is limited
               to circumstances in which their Fund would be unable to meet its
               obligations. The possibility that these circumstances would occur
               is remote. The Trustees intend to conduct the operations of the
               Funds to avoid, to the extent possible, liability of shareholders
               for liabilities of their Fund.
 
SHARES OF THE TRUST
 
               The Trust is authorized to issue an unlimited number of shares of
               beneficial interest with a par value of one cent per share for
               each series of the Trust. Shares of each Fund are fully paid and
               nonassessable when issued. All shares of a Fund participate
               equally in dividends and other distributions by such Fund, and in
               residual assets of that Fund in the event of liquidation. Shares
               of each Fund have no preemptive, conversion or subscription
               rights. Shares of each Fund may be transferred by endorsement or
               stock power as is customary, but a Fund is not bound to recognize
               any transfer until it is recorded on its books.
 
SHAREHOLDER MEETINGS
 
               The Trust does not intend to hold annual shareholder meetings.
               However, special meetings may be called for a specific Fund or
               for the Trust as a whole for purposes such as electing or
               removing Trustees, terminating or reorganizing the Trust,
               changing fundamental policies, or for any other purpose requiring
               a shareholder vote under the 1940 Act. Separate votes are taken
               by each Fund only if a matter affects or requires the vote of
               only that Fund or that Fund's interest in the matter differs from
               the interest of other portfolios of the Trust. As a shareholder,
               you are entitled to one vote for each share that you own.
 
                                                                              75
<PAGE> 
 
VOTING RIGHTS
 
               The present Trustees were elected at a meeting of shareholders
               held on July 10, 1992, with the exception of Mr. Craig and Mr.
               Rothe who were appointed by the Trustees as of June 30, 1995 and
               January 1, 1997, respectively. Under the Declaration of Trust,
               each Trustee will continue in office until the termination of the
               Trust or his earlier death, retirement, resignation, bankruptcy,
               incapacity or removal. Vacancies will be filled by a majority of
               the remaining Trustees, subject to the 1940 Act. Therefore, no
               annual or regular meetings of shareholders normally will be held,
               unless otherwise required by the Declaration of Trust or the 1940
               Act. Subject to the foregoing, shareholders have the power to
               vote to elect or remove Trustees, to terminate or reorganize
               their Fund, to amend the Declaration of Trust, to bring certain
               derivative actions and on any other matters on which a
               shareholder vote is required by the 1940 Act, the Declaration of
               Trust, the Trust's Bylaws or the Trustees.
 
               As mentioned above in "Shareholder Meetings," each share of each
               series of the Trust has one vote (and fractional votes for
               fractional shares). Shares of all series of the Trust have
               noncumulative voting rights, which means that the holders of more
               than 50% of the shares of all series of the Trust voting for the
               election of Trustees can elect 100% of the Trustees if they
               choose to do so and, in such event, the holders of the remaining
               shares will not be able to elect any Trustees.
 
MASTER/FEEDER OPTION
 
               The Trust may in the future seek to achieve a Fund's objective by
               investing all of that Fund's assets in another investment company
               having the same investment objective and substantially the same
               investment policies and restrictions as those applicable to that
               Fund. Unless otherwise required by law, this policy may be
               implemented by the Trustees without shareholder approval.
 
INDEPENDENT ACCOUNTANTS
 
               PricewaterhouseCoopers LLP, 950 Seventeenth Street, Suite 2500,
               Denver, Colorado 80202, independent accountants for the Funds,
 
 76
<PAGE> 
 
               audit the Funds' annual financial statements and prepare their
               tax returns.
 
REGISTRATION STATEMENT
 
               The Trust has filed with the SEC, Washington, D.C., a
               Registration Statement under the Securities Act of 1933, as
               amended, with respect to the securities to which this SAI
               relates. If further information is desired with respect to the
               Funds or such securities, reference is made to the Registration
               Statement and the exhibits filed as a part thereof.
 
                                                                              77
<PAGE> 
Performance information
 
               Quotations of average annual total return for a Fund will be
               expressed in terms of the average annual compounded rate of
               return of a hypothetical investment in such Fund over periods of
               1, 5, and 10 years (up to the life of the Fund). These are the
               annual total rates of return that would equate the initial amount
               invested to the ending redeemable value. These rates of return
               are calculated pursuant to the following formula: P(1 + T)n = ERV
               (where P = a hypothetical initial payment of $1,000, T = the
               average annual total return, n = the number of years and ERV =
               the ending redeemable value of a hypothetical $1,000 payment made
               at the beginning of the period). All total return figures reflect
               the deduction of a proportional share of Fund expenses on an
               annual basis, and assume that all dividends and distributions are
               reinvested when paid.
 
               The average annual total return of each Fund, computed as of
               October 31, 1998, is shown in the table below:
 
   
<TABLE>
<CAPTION>
                                                          Average Annual Total Return
                              Date        Number      -----------------------------------
                            Available    of Months      One      Five     Ten     Life of
        Fund Name           for Sale    in Lifetime    Year     Years    Years     Fund
- -----------------------------------------------------------------------------------------
<S>                         <C>         <C>           <C>       <C>      <C>      <C>
Janus Fund                     2/5/70       245        15.12%   16.08%   17.93%   16.85%
Janus Enterprise Fund          9/1/92        74        11.79%   13.34%      N/A   17.68%
Janus Mercury Fund             5/3/93        66        24.75%   21.20%      N/A   22.54%
Janus Olympus Fund           12/29/95        34        23.10%      N/A      N/A   25.55%
Janus Special Situations
  Fund                       12/31/96        22         8.49%      N/A      N/A   26.00%
Janus Twenty Fund             4/30/85       162        40.58%   23.22%   23.41%   19.20%
Janus Global Life Sciences
  Fund                       12/31/98         *           N/A      N/A      N/A      N/A
Janus Global Technology
  Fund                       12/31/98         *           N/A      N/A      N/A      N/A
Janus Worldwide Fund          5/15/91      89.5        11.40%   17.60%      N/A   19.04%
Janus Balanced Fund            9/1/92        74        15.48%   15.35%      N/A   16.26%
Janus Equity Income Fund      6/28/96        28        19.21%      N/A      N/A   27.00%
Janus Growth and Income
  Fund                        5/15/91      89.5        16.73%   20.01%      N/A   19.94%
Janus Flexible Income Fund     7/7/87       136         8.14%    8.40%    9.22%    9.36%
Janus High-Yield Fund        12/29/95        34        (1.45%)     N/A      N/A   12.01%
Janus Federal Tax-Exempt
  Fund                         5/3/93        66         7.65%    5.25%      N/A    5.94%
Janus Short-Term Bond Fund     9/1/92        74         6.49%    5.47%      N/A    5.40%
</TABLE>
    
 
* The Fund had not commenced operations as of October 31, 1998.
 
 78
<PAGE> 
 
               Quotations of a Fund's yield are based on the investment income
               per share earned during a particular 30-day period (including
               dividends, if any, and interest), less expenses accrued during
               the period ("net investment income"), and are computed by
               dividing net investment income by the net asset value per share
               on the last day of the period, according to the following
               formula:
 
                                 YIELD = 2[(a - b + 1)(6) - 1]
                                            -----
                                             cd
 
               where a = dividend and interest income
                     b = expenses accrued for the period (net of reimbursements)
                     c = average daily number of shares outstanding during the
                         period that were entitled to receive dividends
                     d = maximum net asset value per share on the last day of
                         the period
 
               The tax-equivalent yield used for Janus Federal Tax-Exempt Fund
               is the rate that an investor would have to earn from a fully
               taxable investment after taxes to equal the Fund's tax-free
               yield. Tax-equivalent yields are calculated by dividing a Fund's
               yield by the result of one minus a stated federal or combined
               federal and state tax rate. If only a portion of a Funds' yield
               is tax-exempt, only that portion is adjusted in the calculation.
               Janus Federal Tax-Exempt Fund may invest a portion of its assets
               in obligations that are subject to federal income tax. When the
               Fund invests in these obligations, its tax-equivalent yield will
               be lower.
 
               The yield for the 30-day period ending October 31, 1998, for the
               Fixed-Income Funds is shown below:
 
   
<TABLE>
<S>                                                          <C>
Janus Flexible Income Fund                                    6.05%
Janus High-Yield Fund                                         9.50%
Janus Federal Tax-Exempt Fund                                 4.89%
Janus Short-Term Bond Fund                                    4.78%
</TABLE>
    
 
                                                                              79
<PAGE> 
 
               From time to time in advertisements or sales material, the Funds
               may discuss their performance ratings or other information as
               published by recognized mutual fund statistical rating services,
               including, but not limited to, Lipper Analytical Services, Inc.
               ("Lipper"), Ibbotson Associates, Micropal or Morningstar, Inc.
               ("Morningstar") or by publications of general interest such as
               Forbes, Money, The Wall Street Journal, Mutual Funds Magazine,
               Kiplinger's, or Smart Money. The Funds may also compare their
               performance to that of other selected mutual funds (for example,
               peer groups created by Lipper or Morningstar), mutual fund
               averages or recognized stock market indicators, including, but
               not limited to, the Standard & Poor's 500 Composite Stock Price
               Index, the Standard & Poor's 400 Midcap Index, the Dow Jones
               Industrial Average, the Lehman Brothers Government/Corporate Bond
               Index, the Lehman Brothers Government/ Corporate 1-3 Year Bond
               Index, the Lehman Brothers Long Government/Corporate Bond Index,
               the Lehman Brothers Intermediate Government Bond Index, the
               Lehman Brothers Municipal Bond Index, the Russell 2000 Index and
               the NASDAQ composite. In addition, the Funds may compare their
               total return or yield to the yield on U.S. Treasury obligations
               and to the percentage change in the Consumer Price Index. Janus
               Worldwide Fund may also compare its performance to the record of
               global market indicators, such as the Morgan Stanley
               International World Index. Such performance ratings or
               comparisons may be made with funds that may have different
               investment restrictions, objectives, policies or techniques than
               the Funds and such other funds or market indicators may be
               comprised of securities that differ significantly from the Funds'
               investments.
 
 80
<PAGE> 
Financial statements
 
   
               The following audited financial statements for the period ended
               October 31, 1998 are hereby incorporated into this SAI by
               reference to the Funds' Annual Reports dated October 31, 1998
               (with the exception of Janus Global Life Sciences Fund and Janus
               Global Technology Fund which did not commence operations until
               December 31, 1998).
    
 
DOCUMENTS INCORPORATED BY REFERENCE TO THE ANNUAL REPORTS:
 
               Schedules of Investments as of October 31, 1998
 
               Statements of Operations for the period ended October 31, 1998
 
               Statements of Assets and Liabilities as of October 31, 1998
 
               Statements of Changes in Net Assets for the periods ended October
               31, 1998 and 1997
 
               Financial Highlights for each of the periods indicated
 
               Notes to Financial Statements
 
               Reports of Independent Accountants
 
               The portions of such Annual Reports that are not specifically
               listed above are not incorporated by reference into this SAI and
               are not part of the Registration Statement.
 
                                                                              81
<PAGE> 
Appendix A
 
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>
 
 82
<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>
 
                                                                              83
<PAGE> 
 
               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 different ratings from more than
               one agency are considered investment grade if at least one agency
               has rated the security investment grade.
 
 84
<PAGE>   87
 
                       This page intentionally left blank
<PAGE>   88
 
[JANUS LOGO]

                1-800-525-3713
                P.O. Box 173375
                Denver, Colorado 80217-3375
                janus.com
 
  3170
<PAGE> 
 
                          [JANUS LOGO]
 
                    Janus Investment Fund
 
                    Janus Money Market Fund
                    Janus Government Money Market Fund
                    Janus Tax-Exempt Money Market Fund
                    Investor Shares
 
                    100 Fillmore Street
                    Denver, CO 80206-4928
                    (800) 525-3713
 
                    Statement of Additional Information
 
                    February 17, 1999
 
                    This Statement of Additional Information expands upon and
                    supplements the information contained in the current
                    Prospectus for the Investor Shares (the "Shares") of
                    Janus Money Market Fund, Janus Government Money Market
                    Fund and Janus Tax-Exempt Money Market Fund. The Funds
                    are each a separate series of Janus Investment Fund, a
                    Massachusetts business trust.
 
                    This SAI is not a Prospectus and should be read in
                    conjunction with the Prospectus dated February 17, 1999,
                    which is incorporated by reference into this SAI and may
                    be obtained from the Trust at the above phone number or
                    address. This SAI contains additional and more detailed
                    information about the Funds' operations and activities
                    than the Prospectus. The Annual Report, which contains
                    important financial information about the Funds, is
                    incorporated by reference into this SAI and is also
                    available, without charge, at the above phone number or
                    address.
<PAGE> 
 
    [JANUS LOGO]
<PAGE> 
 
                                                              Table of contents
 
<TABLE>
                <S>                                               <C>
                Investment Restrictions
                and Investment Strategies.......................    2
                Performance Data................................   18
                Investment Adviser and Administrator............   22
                Custodian, Transfer Agent
                and Certain Affiliations........................   26
                Portfolio Transactions and Brokerage............   27
                Trustees and Officers...........................   30
                Purchase of Shares..............................   35
                Redemption of Shares............................   36
                Shareholder Accounts............................   37
                Tax-Deferred Accounts...........................   38
                Dividends and Tax Status........................   40
                Principal Shareholders..........................   42
                Miscellaneous Information.......................   43
                Financial Statements............................   46
                Appendix A - Description of Securities Ratings..   47
                Appendix B - Description of Municipal
                Securities......................................   51
</TABLE>
 
                                                                               1
<PAGE> 
Investment restrictions and 
           investment strategies
 
INVESTMENT RESTRICTIONS
 
               Each Fund has adopted certain fundamental investment restrictions
               that cannot be changed without shareholder approval. Shareholder
               approval means approval by the lesser of (i) more than 50% of the
               outstanding voting securities of the Trust (or a particular Fund
               or particular class of Shares if a matter affects just that Fund
               or that class of Shares), or (ii) 67% or more of the voting
               securities present at a meeting if the holders of more than 50%
               of the outstanding voting securities of the Trust (or a
               particular Fund or class of Shares) are present or represented by
               proxy.
 
               As used in the restrictions set forth below and as used elsewhere
               in this SAI, the term "U.S. Government Securities" shall have the
               meaning set forth in the 1940 Act. The 1940 Act defines U.S.
               Government Securities as securities issued or guaranteed by the
               United States government, its agencies or instrumentalities. U.S.
               Government Securities may also include repurchase agreements
               collateralized and municipal securities escrowed with or refunded
               with escrowed U.S. government securities.
 
               The Funds have adopted the following fundamental policies:
 
               (1) With respect to 75% of its assets, a Fund may not purchase a
               security other than a U.S. Government Security, if, as a result,
               more than 5% of the Fund's total assets would be invested in the
               securities of a single issuer or the Fund would own more than 10%
               of the outstanding voting securities of any single issuer. (As
               noted in the Prospectus, the Funds are also currently subject to
               the greater diversification standards of Rule 2a-7, which are not
               fundamental.)
 
               (2) A Fund may not purchase securities if 25% or more of the
               value of a Fund's total assets would be invested in the
               securities of issuers conducting their principal business
               activities in the same industry; provided that: (i) there is no
               limit on investments in U.S. Government Securities or in
               obligations of domestic commercial banks (including U.S. branches
               of foreign banks subject to regulations under U.S. laws
               applicable to domestic banks and, to the extent that its parent
               is unconditionally liable
 
 2
<PAGE> 
 
               for the obligation, foreign branches of U.S. banks); (ii) this
               limitation shall not apply to a Fund's investments in municipal
               securities; (iii) there is no limit on investments in issuers
               domiciled in a single country; (iv) financial service companies
               are classified according to the end users of their services (for
               example, automobile finance, bank finance and diversified finance
               are each considered to be a separate industry); and (v) utility
               companies are classified according to their services (for
               example, gas, gas transmission, electric, and telephone are each
               considered to be a separate industry).
 
               (3) A Fund may not act as an underwriter of securities issued by
               others, except to the extent that a Fund may be deemed an
               underwriter in connection with the disposition of portfolio
               securities of such Fund.
 
               (4) A Fund may not lend any security or make any other loan if,
               as a result, more than 25% of a Fund's total assets would be lent
               to other parties (but this limitation does not apply to purchases
               of commercial paper, debt securities or repurchase agreements).
 
               (5) A Fund may not purchase or sell real estate or any interest
               therein, except that the Fund may invest in debt obligations
               secured by real estate or interests therein or securities issued
               by companies that invest in real estate or interests therein.
 
               (6) A Fund may borrow money for temporary or emergency purposes
               (not for leveraging) in an amount not exceeding 25% of the value
               of its total assets (including the amount borrowed) less
               liabilities (other than borrowings). If borrowings exceed 25% of
               the value of a Fund's total assets by reason of a decline in net
               assets, the Fund will reduce its borrowings within three business
               days to the extent necessary to comply with the 25% limitation.
               Reverse repurchase agreements or the segregation of assets in
               connection with such agreements shall not be considered borrowing
               for the purposes of this limit.
 
               (7) Each Fund may, notwithstanding any other investment policy or
               restriction (whether or not fundamental), invest all of its
               assets
 
                                                                               3
<PAGE> 
 
               in the securities of a single open-end management investment
               company with substantially the same fundamental investment
               objectives, policies and restrictions as that Fund.
 
               Investment restriction (1) is intended to reflect the
               requirements under Section 5(b)(1) of the 1940 Act for a
               diversified fund. Rule 2a-7 provides that money market funds that
               comply with the diversification limits of Rule 2a-7 are deemed to
               comply with the diversification limits of Section 5(b)(1). Thus,
               the Funds interpret restriction (1) in accordance with Rule 2a-7.
               Accordingly, if securities are subject to a guarantee provided by
               a non-controlled person, the Rule 2a-7 diversification tests
               apply to the guarantor, and the diversification test in
               restriction (1) does not apply to the issuer.
 
               Each Fund has adopted the following nonfundamental investment
               restrictions that may be changed by the Trustees without
               shareholder approval:
 
               (1) A Fund may not invest in securities or enter into repurchase
               agreements with respect to any securities if, as a result, more
               than 10% of the Fund's net assets would be invested in repurchase
               agreements not entitling the holder to payment of principal
               within seven days and in other securities that are not readily
               marketable ("illiquid securities"). The Trustees, or the Fund's
               investment adviser acting pursuant to authority delegated by the
               Trustees, may determine that a readily available market exists
               for certain securities such as securities eligible for resale
               pursuant to Rule 144A under the Securities Act of 1933, or any
               successor to such rule, Section 4(2) commercial paper and
               municipal lease obligations. Accordingly, such securities may not
               be subject to the foregoing limitation.
 
               (2) A Fund may not purchase securities on margin, or make short
               sales of securities, except for short sales against the box and
               the use of short-term credit necessary for the clearance of
               purchases and sales of portfolio securities.
 
 4
<PAGE> 
 
               (3) A Fund may not pledge, mortgage, hypothecate or encumber any
               of its assets except to secure permitted borrowings or in
               connection with permitted short sales.
 
               (4) A Fund may not invest in companies for the purpose of
               exercising control of management.
 
               Under the terms of an exemptive order received from the
               Securities and Exchange Commission ("SEC"), each of the Funds may
               borrow money from or lend money to other funds that permit such
               transactions and for which Janus Capital serves as investment
               adviser. All such borrowing and lending will be subject to the
               above limits. A Fund will borrow money through the program only
               when the costs are equal to or lower than the cost of bank loans.
               Interfund loans and borrowings normally extend overnight, but can
               have a maximum duration of seven days. A Fund will lend through
               the program only when the returns are higher than those available
               from other short-term instruments (such as repurchase
               agreements). A Fund may have to borrow from a bank at a higher
               interest rate if an interfund loan is called or not renewed. Any
               delay in repayment to a lending Fund could result in a lost
               investment opportunity or additional borrowing costs.
 
               For the purposes of the Funds' policies on investing in
               particular industries, the Funds will rely primarily on industry
               or industry group classifications published by Bloomberg L.P. To
               the extent that Bloomberg L.P. industry classifications are so
               broad that the primary economic characteristics in a single
               industry are materially different, the Funds may further classify
               issuers in accordance with industry classifications as published
               by the SEC.
 
INVESTMENT STRATEGIES
 
               Each of the Funds may invest only in "eligible securities" as
               defined in Rule 2a-7 adopted under the 1940 Act. Generally, an
               eligible security is a security that (i) is denominated in U.S.
               dollars and has a remaining maturity of 397 days or less (as
               calculated pursuant to Rule 2a-7); (ii) is rated, or is issued by
               an
 
                                                                               5
<PAGE> 
 
               issuer with short-term debt outstanding that is rated, in one of
               the two highest rating categories by any two nationally
               recognized statistical rating organizations ("NRSROs") or, if
               only one NRSRO has issued a rating, by that NRSRO (the "Requisite
               NRSROs") or is unrated and of comparable quality to a rated
               security, as determined by Janus Capital; and (iii) has been
               determined by Janus Capital to present minimal credit risks
               pursuant to procedures approved by the Trustees. In addition, the
               Funds will maintain a dollar-weighted average portfolio maturity
               of 90 days or less. A description of the ratings of some NRSROs
               appears in Appendix A.
 
               Under Rule 2a-7, a Fund may not invest more than five percent of
               its total assets in the securities of any one issuer other than
               U.S. Government Securities, provided that in certain cases a Fund
               may invest more than 5% of its assets in a single issuer for a
               period of up to three business days. Investment in demand
               features, guarantees and other types of instruments or features
               are subject to the diversification limits under Rule 2a-7.
 
               Pursuant to Rule 2a-7, each Fund (except Janus Tax-Exempt Money
               Market Fund) will invest at least 95% of its total assets in
               "first-tier" securities. First-tier securities are eligible
               securities that are rated, or are issued by an issuer with
               short-term debt outstanding that is rated, in the highest rating
               category by the Requisite NRSROs or are unrated and of comparable
               quality to a rated security. In addition, a Fund may invest in
               "second-tier" securities which are eligible securities that are
               not first-tier securities. However, a Fund (except for Janus
               Tax-Exempt Money Market Fund, in certain cases) may not invest in
               a second-tier security if immediately after the acquisition
               thereof the Fund would have invested more than (i) the greater of
               one percent of its total assets or one million dollars in
               second-tier securities issued by that issuer, or (ii) five
               percent of its total assets in second-tier securities.
 
               The following discussion of types of securities in which the
               Funds may invest supplements and should be read in conjunction
               with the Prospectus.
 
 6
<PAGE> 
 
Participation Interests
 
               Each Fund may purchase participation interests in loans or
               securities in which the Funds may invest directly. Participation
               interests are generally sponsored or issued by banks or other
               financial institutions. A participation interest gives a Fund an
               undivided interest in the underlying loans or securities in the
               proportion that the Fund's interest bears to the total principal
               amount of the underlying loans or securities. Participation
               interests, which may have fixed, floating or variable rates, may
               carry a demand feature backed by a letter of credit or guarantee
               of a bank or institution permitting the holder to tender them
               back to the bank or other institution. For certain participation
               interests, a Fund will have the right to demand payment, on not
               more than seven days' notice, for all or a part of the Fund's
               participation interest. The Funds intend to exercise any demand
               rights they may have upon default under the terms of the loan or
               security, to provide liquidity or to maintain or improve the
               quality of the Funds' investment portfolio. A Fund will only
               purchase participation interests that Janus Capital determines
               present minimal credit risks.
 
Variable and Floating Rate Notes
 
               Janus Money Market Fund also may purchase variable and floating
               rate demand notes of corporations and other entities, which are
               unsecured obligations redeemable upon not more than 30 days'
               notice. These obligations include master demand notes that permit
               investment of fluctuating amounts at varying rates of interest
               pursuant to direct arrangements with the issuer of the
               instrument. The issuer of these obligations often has the right,
               after a given period, to prepay the outstanding principal amount
               of the obligations upon a specified number of days' notice. These
               obligations generally are not traded, nor generally is there an
               established secondary market for these obligations. To the extent
               a demand note does not have a seven day or shorter demand feature
               and there is no readily available market for the obligation, it
               is treated as an illiquid investment.
 
                                                                               7
<PAGE> 
 
               Securities with ultimate maturities of greater than 397 days may
               be purchased only pursuant to Rule 2a-7. Under that Rule, only
               those long-term instruments that have demand features which
               comply with certain requirements and certain variable rate U.S.
               Government Securities may be purchased. The rate of interest on
               securities purchased by a Fund may be tied to short-term Treasury
               or other government securities or indices on securities that are
               permissible investments of the Funds, as well as other money
               market rates of interest. The Funds will not purchase securities
               whose values are tied to interest rates or indices that are not
               appropriate for the duration and volatility standards of a money
               market fund.
 
Mortgage- and Asset-Backed Securities
 
               The Funds may invest in mortgage-backed securities, which
               represent an interest in a pool of mortgages made by lenders such
               as commercial banks, savings and loan institutions, mortgage
               bankers, mortgage brokers and savings banks. Mortgage-backed
               securities may be issued by governmental or government-related
               entities or by non-governmental entities such as banks, savings
               and loan institutions, private mortgage insurance companies,
               mortgage bankers and other secondary market issuers.
 
               Interests in pools of mortgage-backed securities differ from
               other forms of debt securities which normally provide for
               periodic payment of interest in fixed amounts with principal
               payments at maturity or specified call dates. In contrast,
               mortgage-backed securities provide periodic payments which
               consist of interest and, in most cases, principal. In effect,
               these payments are a "pass-through" of the periodic payments and
               optional prepayments made by the individual borrowers on their
               mortgage loans, net of any fees paid to the issuer or guarantor
               of such securities. Additional payments to holders of
               mortgage-backed securities are caused by prepayments resulting
               from the sale of the underlying residential property, refinancing
               or foreclosure, net of fees or costs which may be incurred.
 
               As prepayment rates of individual pools of mortgage loans vary
               widely, it is not possible to predict accurately the average life
               of a
 
 8
<PAGE> 
 
               particular security. Although mortgage-backed securities are
               issued with stated maturities of up to forty years, unscheduled
               or early payments of principal and interest on the underlying
               mortgages may shorten considerably the effective maturities.
               Mortgage-backed securities may have varying assumptions for
               average life. The volume of prepayments of principal on a pool of
               mortgages underlying a particular security will influence the
               yield of that security, and the principal returned to a Fund may
               be reinvested in instruments whose yield may be higher or lower
               than that which might have been obtained had the prepayments not
               occurred. When interest rates are declining, prepayments usually
               increase, with the result that reinvestment of principal
               prepayments will be at a lower rate than the rate applicable to
               the original mortgage-backed security.
 
               The Funds may invest in mortgage-backed securities that are
               issued by agencies or instrumentalities of the U.S. government.
               The Government National Mortgage Association ("GNMA") is the
               principal federal government guarantor of mortgage-backed
               securities. GNMA is a wholly-owned U.S. government corporation
               within the Department of Housing and Urban Development. GNMA
               Certificates are debt securities which represent an interest in
               one mortgage or a pool of mortgages which are insured by the
               Federal Housing Administration or the Farmers Home Administration
               or are guaranteed by the Veterans Administration. The Funds may
               also invest in pools of conventional mortgages which are issued
               or guaranteed by agencies of the U.S. government. GNMA
               pass-through securities are considered to be riskless with
               respect to default in that (i) the underlying mortgage loan
               portfolio is comprised entirely of government-backed loans and
               (ii) the timely payment of both principal and interest on the
               securities is guaranteed by the full faith and credit of the U.S.
               government, regardless of whether or not payments have been made
               on the underlying mortgages. GNMA pass-through securities are,
               however, subject to the same market risk as comparable debt
               securities. Therefore, the market value of a
 
                                                                               9
<PAGE> 
 
               Fund's GNMA securities can be expected to fluctuate in response
               to changes in prevailing interest rate levels.
 
               Residential mortgage loans are pooled also by the Federal Home
               Loan Mortgage Corporation ("FHLMC"). FHLMC is a privately
               managed, publicly chartered agency created by Congress in 1970
               for the purpose of increasing the availability of mortgage credit
               for residential housing. FHLMC issues participation certificates
               ("PCs") which represent interests in mortgages from FHLMC's
               national portfolio. The mortgage loans in FHLMC's portfolio are
               not U.S. government backed; rather, the loans are either
               uninsured with loan-to-value ratios of 80% or less, or privately
               insured if the loan-to-value ratio exceeds 80%. FHLMC guarantees
               the timely payment of interest and ultimate collection of
               principal on FHLMC PCs; the U.S. government does not guarantee
               any aspect of FHLMC PCs.
 
               The Federal National Mortgage Association ("FNMA") is a
               government-sponsored corporation owned entirely by private
               shareholders. It is subject to general regulation by the
               Secretary of Housing and Urban Development. FNMA purchases
               residential mortgages from a list of approved seller/servicers
               which include savings and loan associations, savings banks,
               commercial banks, credit unions and mortgage bankers. FNMA
               guarantees the timely payment of principal and interest on the
               pass-through securities issued by FNMA; the U.S. government does
               not guarantee any aspect of the FNMA pass-through securities.
 
               The Funds may also invest in privately-issued mortgage-backed
               securities to the extent permitted by their investment
               restrictions. Mortgage-backed securities offered by private
               issuers include pass-through securities comprised of pools of
               conventional residential mortgage loans; mortgage-backed bonds
               which are considered to be debt obligations of the institution
               issuing the bonds and which are collateralized by mortgage loans;
               and collateralized mortgage obligations ("CMOs") which are
               collateralized by mortgage-backed securities issued by GNMA,
               FHLMC or FNMA or by pools of conventional mortgages.
 
 10
<PAGE> 
 
               Asset-backed securities represent direct or indirect
               participations in, or are secured by and payable from, assets
               other than mortgage-backed assets such as motor vehicle
               installment sales contracts, installment loan contracts, leases
               of various types of real and personal property and receivables
               from revolving credit agreements (credit cards). Asset-backed
               securities have yield characteristics similar to those of
               mortgage-backed securities and, accordingly, are subject to many
               of the same risks.
 
Reverse Repurchase Agreements
 
               Reverse repurchase agreements are transactions in which a Fund
               sells a security and simultaneously commits to repurchase that
               security from the buyer at an agreed upon price on an agreed upon
               future date. The resale price in a reverse repurchase agreement
               reflects a market rate of interest that is not related to the
               coupon rate or maturity of the sold security. For certain demand
               agreements, there is no agreed upon repurchase date and interest
               payments are calculated daily, often based upon the prevailing
               overnight repurchase rate. The Funds will use the proceeds of
               reverse repurchase agreements only to satisfy unusually heavy
               redemption requests or for other temporary or emergency purposes
               without the necessity of selling portfolio securities.
 
               Generally, a reverse repurchase agreement enables the Fund to
               recover for the term of the reverse repurchase agreement all or
               most of the cash invested in the portfolio securities sold and to
               keep the interest income associated with those portfolio
               securities. Such transactions are only advantageous if the
               interest cost to the Fund of the reverse repurchase transaction
               is less than the cost of obtaining the cash otherwise. In
               addition, interest costs on the money received in a reverse
               repurchase agreement may exceed the return received on the
               investments made by a Fund with those monies.
 
                                                                              11
<PAGE> 
 
When-Issued and Delayed Delivery Securities
 
               Each Fund may purchase securities on a when-issued or delayed
               delivery basis. A Fund will enter into such transactions only
               when it has the intention of actually acquiring the securities.
               To facilitate such acquisitions, the Funds' custodian will
               segregate cash or high quality liquid assets in an amount at
               least equal to such commitments. On delivery dates for such
               transactions, the Fund will meet its obligations from maturities,
               sales of the segregated securities or from other available
               sources of cash. If a Fund chooses to dispose of the right to
               acquire a when-issued security prior to its acquisition, it
               could, as with the disposition of any other portfolio obligation,
               incur a gain or loss due to market fluctuation. At the time a
               Fund makes the commitment to purchase securities on a when-issued
               or delayed delivery basis, it will record the transaction as a
               purchase and thereafter reflect the value of such securities in
               determining its net asset value.
 
Investment Company Securities
 
               From time to time, the Funds may invest in securities of other
               investment companies. The Funds are subject to the provisions of
               Section 12(d)(1) of the 1940 Act. Funds managed by Janus Capital
               ("Janus Funds") may invest in securities of the Funds and any
               other money market funds managed by Janus Capital in excess of
               the limitations of Section 12(d)(1) under the terms of an SEC
               exemptive order obtained by Janus Capital and the Janus Funds.
 
Debt Obligations
 
               Janus Money Market Fund may invest in debt obligations of
               domestic issuers. In general, sales of these securities may not
               be made absent registration under the Securities Act of 1933 or
               the availability of an appropriate exemption. Pursuant to Section
               4(2) of the 1933 Act or Rule 144A adopted under the 1933 Act,
               however, some of these securities are eligible for resale to
               institutional investors, and accordingly, Janus Capital may
               determine that a liquid market exists for such a security
               pursuant to guidelines adopted by the Trustees.
 
 12
<PAGE> 
 
Obligations of Financial Institutions
 
               Janus Money Market Fund may invest in obligations of financial
               institutions. Examples of obligations in which the Fund may
               invest include negotiable certificates of deposit, bankers'
               acceptances, time deposits and other obligations of U.S. banks
               (including savings and loan associations) having total assets in
               excess of one billion dollars and U.S. branches of foreign banks
               having total assets in excess of ten billion dollars. The Fund
               may also invest in Eurodollar and Yankee bank obligations as
               discussed below and other U.S. dollar-denominated obligations of
               foreign banks having total assets in excess of ten billion
               dollars that Janus Capital believes are of an investment quality
               comparable to obligations of U.S. banks in which the Fund may
               invest.
 
               Certificates of deposit represent an institution's obligation to
               repay funds deposited with it that earn a specified interest rate
               over a given period. Bankers' acceptances are negotiable
               obligations of a bank to pay a draft which has been drawn by a
               customer and are usually backed by goods in international trade.
               Time deposits are non-negotiable deposits with a banking
               institution that earn a specified interest rate over a given
               period. Fixed time deposits, which are payable at a stated
               maturity date and bear a fixed rate of interest, generally may be
               withdrawn on demand by the Fund but may be subject to early
               withdrawal penalties and that could reduce the Fund's yield.
               Unless there is a readily available market for them, time
               deposits that are subject to early withdrawal penalties and that
               mature in more than seven days will be treated as illiquid
               securities.
 
               Eurodollar bank obligations are dollar-denominated certificates
               of deposit or time deposits issued outside the U.S. capital
               markets by foreign branches of U.S. banks and by foreign banks.
               Yankee bank obligations are dollar-denominated obligations issued
               in the U.S. capital markets by foreign banks.
 
               Foreign, Eurodollar (and to a limited extent, Yankee) bank
               obligations are subject to certain sovereign risks. One such risk
               is the possibility that a foreign government might prevent
               dollar-
 
                                                                              13
<PAGE> 
 
               denominated funds from flowing across its borders. Other risks
               include: adverse political and economic developments in a foreign
               country; the extent and quality of government regulation of
               financial markets and institutions; the imposition of foreign
               withholding taxes; and exploration or nationalization of foreign
               issuers.
 
U.S. Government Securities
 
               Janus Government Money Market Fund and to a lesser extent, Janus
               Money Market Fund, invest in U.S. Government Securities. U.S.
               Government Securities shall have the meaning set forth in the
               1940 Act. The 1940 Act defines U.S. Government Securities to
               include securities issued or guaranteed by the U.S. Government,
               its agencies and instrumentalities. U.S. Government Securities
               may also include repurchase agreements collateralized by and
               municipal securities escrowed with or refunded with U.S.
               government securities. U.S. Government Securities in which the
               Fund may invest include U.S. Treasury securities and obligations
               issued or guaranteed by U.S. government agencies and
               instrumentalities that are backed by the full faith and credit of
               the U.S. government, such as those guaranteed by the Small
               Business Administration or issued by the Government National
               Mortgage Association. In addition, U.S. Government Securities in
               which the Fund may invest include securities supported primarily
               or solely by the creditworthiness of the issuer, such as
               securities of the Federal National Mortgage Association, the
               Federal Home Loan Mortgage Corporation and the Tennessee Valley
               Authority. There is no guarantee that the U.S. government will
               support securities not backed by its full faith and credit.
               Accordingly, although these securities have historically involved
               little risk of loss of principal if held to maturity, they may
               involve more risk than securities backed by the full faith and
               credit of the U.S. government.
 
Municipal Securities
 
               The municipal securities in which Janus Tax-Exempt Money Market
               Fund may invest include municipal notes and short-term municipal
               bonds. Municipal notes are generally used to provide for the
               issuer's short-term capital needs and generally have
 
 14
<PAGE> 
 
               maturities of 397 days or less. Examples include tax anticipation
               and revenue anticipation notes, which generally are issued in
               anticipation of various seasonal revenues, bond anticipation
               notes, construction loan notes and tax-exempt commercial paper.
               Short-term municipal bonds may include "general obligation
               bonds," which are secured by the issuer's pledge of its faith,
               credit and taxing power for payment of principal and interest;
               "revenue bonds," which are generally paid from the revenues of a
               particular facility or a specific excise tax or other source; and
               "industrial development bonds," which are issued by or on behalf
               of public authorities to provide funding for various privately
               operated industrial and commercial facilities. The Fund may also
               invest in high quality participation interests in municipal
               securities. A more detailed description of various types of
               municipal securities is contained in Appendix B.
 
               When the assets and revenues of an agency, authority,
               instrumentality or other political subdivision are separate from
               those of the government creating the issuing entity and a
               security is backed only by the assets and revenues of the issuing
               entity, that entity will be deemed to be the sole issuer of the
               security. Similarly, in the case of an industrial development
               bond backed only by the assets and revenues of the
               non-governmental issuer, the non-governmental issuer will be
               deemed to be the sole issuer of the bond.
 
Municipal Leases
 
               Janus Money Market Fund and Janus Tax-Exempt Money Market Fund
               may invest in municipal leases. Municipal leases are municipal
               securities which may take the form of a lease or an installment
               purchase or conditional sales contract. Municipal leases are
               issued by state and local governments and authorities to acquire
               a wide variety of equipment and facilities. Municipal leases
               frequently have special risks not normally associated with
               general obligation or revenue bonds. Leases and installment
               purchase or conditional sales contracts (which normally provide
               for title to the leased asset to pass eventually to the
               government issuer) have
 
                                                                              15
<PAGE> 
 
               evolved as a means for governmental issuers to acquire property
               and equipment without meeting the constitutional and statutory
               requirements for the issuance of debt. The debt-issuance
               limitations of many state constitutions and statutes are deemed
               to be inapplicable because of the inclusion in many leases or
               contracts of "non-appropriation" clauses that provide that the
               governmental issuer has no obligation to make future payments
               under the lease or contract unless money is appropriated for such
               purpose by the appropriate legislative body on a yearly or other
               periodic basis. The Funds will only purchase municipal leases
               subject to a non-appropriation clause when the payment of
               principal and accrued interest is backed by an unconditional,
               irrevocable letter of credit, or guarantee of a bank or other
               entity that meets the criteria described in the Prospectus under
               "Taxable Investments".
 
               In evaluating municipal lease obligations, Janus Capital will
               consider such factors as it deems appropriate, including: (a)
               whether the lease can be canceled; (b) the ability of the lease
               obligee to direct the sale of the underlying assets; (c) the
               general creditworthiness of the lease obligor; (d) the likelihood
               that the municipality will discontinue appropriating funding for
               the leased property in the event such property is no longer
               considered essential by the municipality; (e) the legal recourse
               of the lease obligee in the event of such a failure to
               appropriate funding; (f) whether the security is backed by a
               credit enhancement such as insurance; and (g) any limitations
               which are imposed on the lease obligor's ability to utilize
               substitute property or services other than those covered by the
               lease obligation. If a lease is backed by an unconditional letter
               of credit or other unconditional credit enhancement, then Janus
               Capital may determine that a lease is an eligible security solely
               on the basis of its evaluation of the credit enhancement.
 
               Municipal leases, like other municipal debt obligations, are
               subject to the risk of non-payment. The ability of issuers of
               municipal leases to make timely lease payments may be adversely
               impacted in general economic downturns and as relative
               governmental cost burdens are allocated and reallocated among
               federal, state and
 
 16
<PAGE> 
 
               local governmental units. Such non-payment would result in a
               reduction of income to the Fund, and could result in a reduction
               in the value of the municipal lease experiencing non-payment and
               a potential decrease in the net asset value of the Fund.
 
                                                                              17
<PAGE> 
Performance data
 
               A Fund may provide current annualized and effective annualized
               yield quotations based on its daily dividends. These quotations
               may from time to time be used in advertisements, shareholder
               reports or other communications to shareholders. All performance
               information supplied by the Funds in advertising is historical
               and is not intended to indicate future returns.
 
               In performance advertising, the Funds may compare their Shares'
               performance information with data published by independent
               evaluators such as Morningstar, Inc., Lipper Analytical Services,
               Inc., CDC/Wiesenberger, IBC/Donoghue's Money Fund Report or other
               companies which track the investment performance of investment
               companies ("Fund Tracking Companies"). The Funds may also compare
               their Shares' performance information with the performance of
               recognized stock, bond and other indices, including but not
               limited to the Municipal Bond Buyers Indices, the Salomon
               Brothers Bond Index, the Lehman Bond Index, the Standard & Poor's
               500 Composite Stock Price Index, the Dow Jones Industrial
               Average, U.S. Treasury bonds, bills or notes and changes in the
               Consumer Price Index as published by the U.S. Department of
               Commerce. The Funds may refer to general market performance over
               past time periods such as those published by Ibbotson Associates
               (for instance, its "Stocks, Bonds, Bills and Inflation
               Yearbook"). The Funds may also refer in such materials to mutual
               fund performance rankings and other data published by Fund
               Tracking Companies. Performance advertising may also refer to
               discussions of the Funds and comparative mutual fund data and
               ratings reported in independent periodicals, such as newspapers
               and financial magazines. The Funds may also compare the Shares'
               yield to those of certain U.S. Treasury obligations or other
               money market instruments.
 
               Any current yield quotation of the Shares which is used in such a
               manner as to be subject to the provisions of Rule 482(d) under
               the Securities Act of 1933, as amended, shall consist of an
               annualized historical yield, carried at least to the nearest
               hundredth of one percent, based on a specific seven calendar day
               period. The Fund's current yield shall be calculated by (a)
               determining the net change during a seven calendar day period
 
 18
<PAGE> 
 
               in the value of a hypothetical account having a balance of one
               share at the beginning of the period, (b) dividing the net change
               by the value of the account at the beginning of the period to
               obtain a base period return, and (c) multiplying the quotient by
               365/7 (i.e., annualizing). For this purpose, the net change in
               account value would reflect the value of additional Shares
               purchased with dividends declared on the original Share and
               dividends declared on both the original Share and any such
               additional Shares, but would not reflect any realized gains or
               losses from the sale of securities or any unrealized appreciation
               or depreciation on portfolio securities. In addition, the Shares
               may advertise effective yield quotations. Effective yield
               quotations are calculated by adding 1 to the base period return,
               raising the sum to a power equal to 365/7, and subtracting 1 from
               the result (i.e., compounding).
 
               Janus Tax-Exempt Money Market Fund's tax equivalent yield is the
               rate an investor would have to earn from a fully taxable
               investment in order to equal such Shares' yield after taxes. Tax
               equivalent yields are calculated by dividing Janus Tax-Exempt
               Money Market Fund's yield by one minus the stated federal or
               combined federal and state tax rate. If only a portion of the
               Shares' yield is tax-exempt, only that portion is adjusted in the
               calculation.
 
               The Shares' current yield and effective yield for the seven-day
               period ended October 31, 1998 is shown below:
 
   
<TABLE>
<CAPTION>
                                                         Seven-day         Effective
                       Fund Name                           Yield        Seven-day Yield
- ---------------------------------------------------------------------------------------
<S>                                                      <C>            <C>
Janus Money Market Fund - Investor Shares                  4.89%             5.01%
Janus Government Money Market Fund - Investor Shares       4.73%             4.84%
Janus Tax-Exempt Money Market Fund - Investor Shares*      3.08%             3.13%
</TABLE>
    
 
   
*Janus Tax-Exempt Money Market Fund Investor Shares' tax equivalent yield for
 the seven day period ended October 31, 1998 was 4.28%.
    
 
                                                                              19
<PAGE> 
 
               Although published yield information is useful to investors in
               reviewing a Fund's performance, investors should be aware that
               the Fund's yield fluctuates from day to day and that the Fund's
               yield for any given period is not an indication or representation
               by the Fund of future yields or rates of return on the Shares.
               Also, processing organizations or other institutions may charge
               their customers direct fees in connection with an investment in a
               Fund, which will have the effect of reducing the Fund's net yield
               to those shareholders. The yield on a class of Shares is not
               fixed or guaranteed, and an investment in the Shares is not
               insured. Accordingly, yield information may not necessarily be
               used to compare Shares with investment alternatives which, like
               money market instruments or bank accounts, may provide a fixed
               rate of interest. In addition, because investments in the Funds
               are not insured or guaranteed, yield on the Shares may not
               necessarily be used to compare the Shares with investment
               alternatives which are insured or guaranteed.
 
DETERMINATION OF NET ASSET VALUE
 
               Pursuant to the rules of the SEC, the Trustees have established
               procedures to stabilize each Fund's net asset value at $1.00 per
               Share. These procedures include a review of the extent of any
               deviation of net asset value per Share as a result of fluctuating
               interest rates, based on available market rates, from the Fund's
               $1.00 amortized cost price per Share. Should that deviation
               exceed 1/2 of 1%, the Trustees will consider whether any action
               should be initiated to eliminate or reduce material dilution or
               other unfair results to shareholders. Such action may include
               redemption of Shares in kind, selling portfolio securities prior
               to maturity, reducing or withholding dividends and utilizing a
               net asset value per Share as determined by using available market
               quotations. Each Fund i) will maintain a dollar-weighted average
               portfolio maturity of 90 days or less; ii) will not purchase any
               instrument with a remaining maturity greater than 397 days or
               subject to a repurchase agreement having a duration of greater
               than 397 days; iii) will limit portfolio investments, including
               repurchase agreements, to those U.S. dollar-denominated
               instruments that Janus Capital has determined present minimal
               credit
 
 20
<PAGE> 
 
               risks pursuant to procedures established by the Trustees; and iv)
               will comply with certain reporting and recordkeeping procedures.
               The Trust has also established procedures to ensure that
               portfolio securities meet the Funds' high quality criteria.
 
                                                                              21
<PAGE> 
Investment adviser and 
           administrator
 
   
               As stated in the Prospectus, each Fund has an Investment Advisory
               Agreement with Janus Capital, 100 Fillmore Street, Denver,
               Colorado 80206-4928. Each Advisory Agreement provides that Janus
               Capital will furnish continuous advice and recommendations
               concerning the Funds' investments. The Funds have each agreed to
               compensate Janus Capital for its advisory services by the monthly
               payment of an advisory fee at the annual rate of .20% of the
               average daily net assets of each Fund. However, Janus Capital has
               agreed to waive .10% of the value of each Fund's average daily
               net assets of the advisory fee. Janus Capital has agreed to
               continue such waivers until at least the next annual renewal of
               the advisory agreements. In addition, the Funds pay brokerage
               commissions or dealer spreads and other expenses in connection
               with the execution of portfolio transactions.
    
 
               On behalf of the Shares, each of the Funds has also entered into
               an Administration Agreement with Janus Capital. Under the terms
               of the Administration Agreements, each of the Funds has agreed to
               compensate Janus Capital for administrative services at the
               annual rate of .50% of the value of the average daily net assets
               of the Shares for certain services, including custody, transfer
               agent fees and expenses, legal fees not related to litigation,
               accounting expenses, net asset value determination and Fund
               accounting, recordkeeping, and blue sky registration and
               monitoring services, registration fees, expenses of shareholders'
               meetings and reports to shareholders, costs of preparing,
               printing and mailing the Shares' Prospectuses and Statements of
               Additional Information to current shareholders, and other costs
               of complying with applicable laws regulating the sale of Shares.
               Each Fund will pay those expenses not assumed by Janus Capital,
               including interest and taxes, fees and expenses of Trustees who
               are not affiliated with Janus Capital, audit fees and expenses,
               and extraordinary costs.
 
 22
<PAGE> 
 
               The following table summarizes the advisory fees paid by the
               Funds for the fiscal years ended October 31:
 
   
<TABLE>
<CAPTION>
                                 1998                      1997                      1996
                        -----------------------   -----------------------   -----------------------
                         Advisory     Advisory     Advisory     Advisory     Advisory     Advisory
                        Fees Prior   Fees After   Fees Prior   Fees After   Fees Prior   Fees After
      Fund Name         to Waiver      Waiver     to Waiver      Waiver     to Waiver      Waiver
- ---------------------------------------------------------------------------------------------------
<S>                     <C>          <C>          <C>          <C>          <C>          <C>
Janus Money Market
  Fund                  $9,548,370   $4,774,185   $6,858,596   $3,429,298   $3,101,530   $1,550,765
Janus Government Money
  Market Fund             $944,654     $472,327     $362,308     $181,154     $330,914     $165,457
Janus Tax-Exempt Money
  Market Fund             $226,264     $113,132     $158,812      $79,406     $140,898      $70,449
</TABLE>
    
 
(1) February 15, 1995 (inception) to October 31, 1995.
 
               The following table summarizes the administration fees paid by
               the Shares for the fiscal years ended October 31:
 
   
<TABLE>
<CAPTION>
                                                     1998             1997             1996
                                                --------------   --------------   --------------
                                                Administration   Administration   Administration
                  Fund Name                          Fees             Fees             Fees
- ------------------------------------------------------------------------------------------------
<S>                                             <C>              <C>              <C>
Janus Money Market Fund - Investor Shares         $5,619,954       $4,415,259       $3,381,669
Janus Government Money Market Fund - Investor
  Shares                                             $752,625        $615,966           $560,294
Janus Tax-Exempt Money Market Fund - Investor
  Shares                                            $455,293          $379,650          $343,475
</TABLE>
    
 
               Advisory fees are paid on the Fund level while administration
               fees are paid on the class level.
 
               The Advisory Agreements for each Fund were reexecuted on July 1,
               1997 (without amendment other than effective dates) and will
               continue in effect until July 1, 1999, and thereafter from year
               to year so long as such continuance is approved annually by a
               majority of the Trustees who are not parties to the Advisory
               Agreements or interested persons of any such party, and by either
               a majority of the outstanding voting shares or the Trustees of
               the Funds. Each Advisory Agreement i) may be terminated without
 
                                                                              23
<PAGE> 
 
               the payment of any penalty by any Fund or Janus Capital on
               60 days' written notice; ii) terminates automatically in the
               event of its assignment; and iii) generally, may not be amended
               without the approval of a majority of the Trustees of the
               affected Fund, including the Trustees who are not interested
               persons of that Fund or Janus Capital and, to the extent required
               by the 1940 Act, the vote of a majority of the outstanding voting
               securities of that Fund.
 
               Janus Capital also acts as sub-adviser for a number of
               private-label mutual funds and provides separate account advisory
               services for institutional accounts. Investment decisions for
               each account managed by Janus Capital, including the Funds, are
               made independently from those for any other account that is or
               may in the future become managed by Janus Capital or its
               affiliates. If, however, a number of accounts managed by Janus
               Capital are contemporaneously engaged in the purchase or sale of
               the same security, the orders may be aggregated and/or the
               transactions may be averaged as to price and allocated equitably
               to each account. In some cases, this policy might adversely
               affect the price paid or received by an account or the size of
               the position obtained or liquidated for an account. Pursuant to
               an exemptive order granted by the SEC, the Funds and other funds
               advised by Janus Capital may also transfer daily uninvested cash
               balances into one or more joint trading accounts. Assets in the
               joint trading accounts are invested in money market instruments
               and the proceeds are allocated to the participating funds on a
               pro rata basis.
 
               Kansas City Southern Industries, Inc. ("KCSI") owns approximately
               82% of the outstanding voting stock of Janus Capital, most of
               which it acquired in 1984. KCSI is a publicly traded holding
               company whose primary subsidiaries are engaged in transportation,
               information processing and financial services. Thomas H. Bailey,
               President and Chairman of the Board of Janus Capital, owns
               approximately 12% of its voting stock and, by agreement with
               KCSI, selects a majority of Janus Capital's Board.
 
               KCSI has announced its intention to separate its transportation
               and financial services businesses. KCSI is currently studying
 
 24
<PAGE> 
 
               alternatives for completion of the separation that meet its
               business objectives without risking adverse tax consequences.
               KCSI expects completion of the separation to be contemplated in
               1999.
 
               Each account managed by Janus Capital has its own investment
               objective and is managed in accordance with that objective by a
               particular portfolio manager or team of portfolio managers. As a
               result, from time to time two or more different managed accounts
               may pursue divergent investment strategies with respect to
               investments or categories of investments.
 
               Janus Capital does not permit portfolio managers to purchase and
               sell securities for their own accounts except under the limited
               exceptions contained in Janus Capital's policy regarding personal
               investing by directors, officers and employees of Janus Capital
               and the Funds. The policy requires investment personnel and
               officers of Janus Capital, inside directors of Janus Capital and
               the Funds and other designated persons deemed to have access to
               current trading information to pre-clear all transactions in
               securities not otherwise exempt under the policy. Requests for
               trading authority will be denied when, among other reasons, the
               proposed personal transaction would be contrary to the provisions
               of the policy or would be deemed to adversely affect any
               transaction then known to be under consideration for or to have
               been effected on behalf of any client account, including the
               Funds.
 
               In addition to the pre-clearance requirement described above, the
               policy subjects investment personnel, officers and
               directors/Trustees of Janus Capital and the Funds to various
               trading restrictions and reporting obligations. All reportable
               transactions are required to be reviewed for compliance with
               Janus Capital's policy. Those persons also may be required under
               certain circumstances to forfeit their profits made from personal
               trading.
 
               The provisions of the policy are administered by and subject to
               exceptions authorized by Janus Capital.
 
                                                                              25
<PAGE> 
   
Custodian, transfer agent and 
           certain affiliations
    
 
               UMB Bank, N.A. ("UMB"), P.O. Box 419226, Kansas City, Missouri
               64141-6226, is the Funds' current custodian. However, it is
               expected that Citibank, N.A., 111 Wall Street 24th Floor, Zone 5,
               New York, NY 10043, will replace UMB as custodian for the Funds
               in the first quarter of 1999. The custodian holds the Funds'
               assets in safekeeping and collects and remits the income thereon,
               subject to the instructions of each Fund.
 
               Janus Service Corporation, P.O. Box 173375, Denver, Colorado
               80217-3375, a wholly-owned subsidiary of Janus Capital, is the
               Funds' transfer agent. In addition, Janus Service provides
               certain other administrative, recordkeeping and shareholder
               relations services to the Funds. The Funds do not pay Janus
               Service a fee.
 
               Janus Distributors, Inc., 100 Fillmore Street, Denver, Colorado
               80206-4928, a wholly-owned subsidiary of Janus Capital, is a
               distributor of the Funds. Janus Distributors is registered as a
               broker-dealer under the Securities Exchange Act of 1934 and is a
               member of the National Association of Securities Dealers, Inc.
               Janus Distributors acts as the agent of the Funds in connection
               with the sale of their shares in all states in which the shares
               are registered and in which Janus Distributors is qualified as a
               broker-dealer. Under the Distribution Agreement, Janus
               Distributors continuously offers the Funds' shares and accepts
               orders at net asset value. No sales charges are paid by
               investors. Promotional expenses in connection with offers and
               sales of shares are paid by Janus Capital.
 
               Janus Capital also may make payments to selected broker-dealer
               firms or institutions which were instrumental in the acquisition
               of shareholders for the Funds or which performed services with
               respect to shareholder accounts. The minimum aggregate size
               required for eligibility for such payments, and the factors in
               selecting the broker-dealer firms and institutions to which they
               will be made, are determined from time to time by Janus Capital.
 
 26
<PAGE> 
Portfolio transactions and brokerage
 
               Decisions as to the assignment of portfolio business for the
               Funds and negotiation of its commission rates are made by Janus
               Capital, whose policy is to obtain the "best execution" (prompt
               and reliable execution at the most favorable security price) of
               all portfolio transactions.
 
               In selecting brokers and dealers and in negotiating commissions,
               Janus Capital considers a number of factors, including but not
               limited to: Janus Capital's knowledge of currently available
               negotiated commission rates or prices of securities currently
               available and other current transaction costs; the nature of the
               security being traded; the size and type of the transaction; the
               nature and character of the markets for the security to be
               purchased or sold; the desired timing of the trade; the activity
               existing and expected in the market for the particular security;
               confidentiality; the quality of the execution, clearance and
               settlement services; financial stability of the broker or dealer;
               the existence of actual or apparent operational problems of any
               broker or dealer; and research products or services provided. In
               recognition of the value of the foregoing factors, Janus Capital
               may place portfolio transactions with a broker or dealer with
               whom it has negotiated a commission that is in excess of the
               commission another broker or dealer would have charged for
               effecting that transaction if Janus Capital determines in good
               faith that such amount of commission was reasonable in relation
               to the value of the brokerage and research provided by such
               broker or dealer viewed in terms of either that particular
               transaction or of the overall responsibilities of Janus Capital.
               These research and other services may include, but are not
               limited to, general economic and security market reviews,
               industry and company reviews, evaluations of securities,
               recommendations as to the purchase and sale of securities, and
               access to third party publications, computer and electronic
               equipment and software. Research received from brokers or dealers
               is supplemental to Janus Capital's own research efforts.
 
               For the fiscal year ended October 31, 1998, the Funds paid no
               brokerage commissions to brokers and dealers in transactions
 
                                                                              27
<PAGE> 
 
               identified for execution primarily on the basis of research and
               other services provided to the Funds.
 
               For the fiscal years ended October 31, 1998, October 31, 1997 and
               October 31, 1996, the total brokerage commissions paid by the
               Funds are summarized below:
 
   
<TABLE>
<CAPTION>
                       Fund Name                            1998       1997        1996
- ----------------------------------------------------------------------------------------
<S>                                                         <C>       <C>         <C>
Janus Money Market Fund                                     $0          $0        $4,851
Janus Government Money Market Fund                          $0          $0          $0
Janus Tax-Exempt Money Market Fund                          $0          $0          $0
</TABLE>
    
 
               The Funds generally buy and sell securities in principal
               transactions, in which no commissions are paid. However, the
               Funds may engage an agent and pay commissions for such
               transactions if Janus Capital believes that the net result of the
               transaction to the respective Fund will be no less favorable than
               that of contemporaneously available principal transactions.
 
               Janus Capital may use research products and services in servicing
               other accounts in addition to the Funds. If Janus Capital
               determines that any research product or service has a mixed use,
               such that it also serves functions that do not assist in the
               investment decision-making process, Janus Capital may allocate
               the costs of such service or product accordingly. Only that
               portion of the product or service that Janus Capital determines
               will assist it in the investment decision-making process may be
               paid for in brokerage commission dollars. Such allocation may
               create a conflict of interest for Janus Capital.
 
               Janus Capital may consider sales of Shares by a broker-dealer or
               the recommendation of a broker-dealer to its customers that they
               purchase Shares as a factor in the selection of broker-dealers to
               execute Fund portfolio transactions. Janus Capital may also
               consider payments made by brokers effecting transactions for a
               Fund (i) to the Fund or (ii) to other persons on behalf of the
               Fund for services provided to the Fund for which it would be
               obligated to pay. In placing portfolio business with such broker-
               dealers, Janus Capital will seek the best execution of each
               transaction.
 
 28
<PAGE> 
 
               When the Funds purchase or sell a security in the over-the-
               counter market, the transaction takes place directly with a
               principal market-maker, without the use of a broker, except in
               those circumstances where in the opinion of Janus Capital better
               prices and executions will be achieved through the use of a
               broker.
 
               As of October 31, 1998, certain Funds owned securities of their
               regular broker-dealers (or parents), as shown below:
 
   
<TABLE>
<CAPTION>
                                        Name of                  Value of
        Fund Name                    Broker-Dealer           Securities Owned
- -----------------------------------------------------------------------------
<S>                         <C>                              <C>
Janus Money Market Fund     Banker's Trust Securities Corp.    $262,495,236
                            Merrill Lynch, Pierce, Fenner &
                              Smith, Inc.                      $139,999,803
                            Lehman Brothers, Inc.              $300,000,000
                            Goldman Sachs Group L.P.           $300,000,000
                            Deutsche Morgan Grenfell, Inc.     $150,000,000
                            Bear Stearns Co., Inc.             $ 99,015,375
                            ABN AMRO Securities, Inc.          $586,000,000
                            BT Alex Brown, Inc.                $ 50,000,000
                            Salomon Smith Barney, Inc.         $675,000,000
                            HSBC America, Inc.                 $ 73,435,489
                            CIT Group, Inc.                    $149,881,540
                            Barclay Capital, Inc.              $250,000,000
Janus Government Money
  Market Fund               ABN AMRO Securities, Inc.          $ 93,200,000
                            CS First Boston, Inc.              $250,000,000
                            JP Morgan Securities, Inc.         $ 25,100,000
                            Salomon Smith Barney, Inc.         $125,000,000
</TABLE>
    
 
                                                                              29
<PAGE> 
Trustees and officers
 
               The following are the names of the Trustees and officers of the
               Trust, together with a brief description of their principal
               occupations during the last five years.
 
Thomas H. Bailey, Age 61  - Trustee, Chairman and President*#
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Trustee, Chairman and President of Janus Aspen Series. Chairman,
               Chief Executive Officer, Director and President of Janus Capital.
               Director of Janus Distributors, Inc.
 
James P. Craig, III, Age 42 - Trustee*#
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Trustee and Executive Vice President of Janus Aspen Series. Chief
               Investment Officer, Vice Chairman and Director of Janus Capital.
               Executive Vice President and Portfolio Manager of Janus Fund.
               Executive Vice President and Co-Manager of Janus Venture Fund.
 
Gary O. Loo, Age 58 - Trustee#
102 N. Cascade Avenue, Suite 500
Colorado Springs, CO 80903
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. President and Director of High
               Valley Group, Inc., Colorado Springs, CO (investments).
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
#Member of the Trust's Executive Committee.
 
 30
<PAGE> 
 
Dennis B. Mullen, Age 55 - Trustee
7500 E. McCormick Parkway, #24
Scottsdale, AZ 85258
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Private Investor. Formerly (1997-
               1998), Chief Financial Officer-Boston Market Concepts, Boston
               Chicken, Inc., Golden, CO (restaurant chain); (1993-1997),
               President and Chief Executive Officer of BC Northwest, L.P., a
               franchise of Boston Chicken, Inc., Bellevue, WA (restaurant
               chain).
 
James T. Rothe, Age 55 - Trustee
102 South Tejon Street, Suite 1100
Colorado Springs, CO 80903
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Professor of Business, University
               of Colorado, Colorado Springs, CO. Principal, Phillips-Smith
               Retail Group, Colorado Springs, CO (a venture capital firm).
               Formerly (1986-1994), Dean of the College of Business, University
               of Colorado, Colorado Springs, CO.
 
William D. Stewart, Age 54 - Trustee#
5330 Sterling Drive
Boulder, CO 80302
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. President of HPS Division of MKS
               Instruments, Boulder, CO (manufacturer of vacuum fittings and
               valves).
 
Martin H. Waldinger, Age 60 - Trustee
4940 Sandshore Court
San Diego, CA 92130
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Private Consultant. Formerly (1993
               - 1996), Director of Run Technologies, Inc., a software
               development firm, San Carlos, CA.
 
- --------------------------------------------------------------------------------
#Member of the Trust's Executive Committee.
 
                                                                              31
<PAGE> 
 
Sharon S. Pichler, Age 49 - Executive Vice President*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
   
               Executive Vice President of Janus Money Market Fund, Janus
               Government Money Market Fund and Janus Tax-Exempt Money Market
               Fund. Portfolio Manager of Janus Money Market Fund and Janus
               Tax-Exempt Money Market Fund. Formerly, Portfolio Manager of
               Janus Government Money Market Fund (February 1995-February 1999).
               Vice President of Janus Capital. Formerly, Assistant Vice
               President and Portfolio Manager at USAA Investment Management Co.
               (1990-1994).
    
 
Thomas A. Early, Age 44 - Vice President and General Counsel*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Vice President and General Counsel of Janus Aspen Series. Vice
               President, General Counsel and Secretary of Janus Capital. Vice
               President and General Counsel of Janus Service Corporation, Janus
               Distributors, Inc. and Janus Capital International, Ltd. Director
               of Janus World Funds Plc. Formerly (1997-1998), Executive Vice
               President and General Counsel of Prudential Investments Fund
               Management LLC, Newark, NJ. Formerly (1994-1997), Vice President
               and General Counsel of Prudential Retirement Services, Newark,
               NJ. Formerly (1988-1994), Associate General Counsel and Chief
               Financial Services Counsel, Frank Russell Company, Tacoma, WA.
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
 
 32
<PAGE> 
 
Steven R. Goodbarn, Age 41 - Vice President and Chief Financial Officer*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Vice President and Chief Financial Officer of Janus Aspen Series.
               Vice President of Finance, Treasurer and Chief Financial Officer
               of Janus Capital, Janus Service Corporation and Janus
               Distributors, Inc. Director of Janus Service Corporation, Janus
               Distributors, Inc. and Janus World Funds Plc. Director, Treasurer
               and Vice President of Finance of Janus Capital International Ltd.
               Formerly (May 1992-January 1996), Treasurer of Janus Investment
               Fund and Janus Aspen Series.
 
Kelley Abbott Howes, Age 33 - Assistant Vice President and Secretary*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Assistant Vice President and Secretary of Janus Aspen Series.
               Director and President of Janus Distributors, Inc. Assistant Vice
               President and Associate Counsel of Janus Capital. Formerly (1990
               - 1994), with The Boston Company Advisors, Inc., Boston, MA
               (mutual fund administration services).
 
Glenn P. O'Flaherty, Age 40  - Treasurer and Chief Accounting Officer*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Treasurer and Chief Accounting Officer of Janus Aspen Series.
               Vice President of Janus Capital. Formerly (1991-1997) Director of
               Fund Accounting, Janus Capital.
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
 
                                                                              33
<PAGE> 
 
               The Trustees are responsible for major decisions relating to each
               Fund's objective, policies and techniques. The Trustees also
               supervise the operation of the Funds by their officers and review
               the investment decisions of the officers, although they do not
               actively participate on a regular basis in making such decisions.
 
               The Trust's Executive Committee shall have and may exercise all
               the powers and authority of the Trustees except for matters
               requiring action by all Trustees pursuant to the Trust's Bylaws
               or Declaration of Trust, Massachusetts Law or the 1940 Act.
 
               The Money Market Funds Committee, consisting of Messrs. Loo,
               Mullen and Rothe, monitors the compliance with policies and
               procedures adopted particularly for money market funds.
 
               The following table shows the aggregate compensation earned by
               and paid to each Trustee by the Funds described in this SAI and
               all funds advised and sponsored by Janus Capital (collectively,
               the "Janus Funds") for the periods indicated. None of the
               Trustees receives any pension or retirement benefits from the
               Funds or the Janus Funds.
 
   
<TABLE>
<CAPTION>
                                                Aggregate Compensation     Total Compensation
                                                  from the Funds for    from the Janus Funds for
                                                  fiscal year ended        calendar year ended
           Name of Person, Position                October 31, 1998        December 31, 1998**
- -------------------------------------------------------------------------------------------------
<S>                                             <C>                     <C>
Thomas H. Bailey, Chairman and Trustee*                   $0                       $0
James P. Craig, Trustee*                                  $0                       $0
William D. Stewart, Trustee                            $ 5,754                   $82,000
Gary O. Loo, Trustee                                   $13,896                   $74,000
Dennis B. Mullen, Trustee                              $12,531                   $82,000
Martin H. Waldinger, Trustee                           $ 5,517                   $74,000
James T. Rothe, Trustee                                $11,913                   $82,000
</TABLE>
    
 
 *An interested person of the Funds and of Janus Capital. Compensated by Janus
  Capital and not the Funds.
**As of December 31, 1998, Janus Funds consisted of two registered investment
  companies comprised of a total of 32 funds.
 
 34
<PAGE> 
Purchase of shares
 
   
               Shares are sold at the net asset value per share as determined at
               the close of the regular trading session of the New York Stock
               Exchange (the "NYSE" or the "Exchange") next occurring after a
               purchase order is received and accepted by a Fund (except net
               asset value is normally determined at 5:00 p.m. (New York time)
               for Janus Government Money Market Fund). A Fund's net asset value
               is calculated each day that both the NYSE and the Federal Reserve
               Banks are open ("bank business day"). As stated in the
               Prospectus, the Funds each seek to maintain a stable net asset
               value per share of $1.00. The Shareholder's Manual Section of the
               Prospectus contains detailed information about the purchase of
               Shares.
    
 
REINVESTMENT OF DIVIDENDS AND DISTRIBUTIONS
 
               If investors do not elect in writing or by phone to receive their
               dividends and distributions in cash, all income dividends and
               capital gains distributions, if any, on Shares are reinvested
               automatically in additional Shares of that Fund at the NAV
               determined on the payment date. Checks for cash dividends and
               distributions and confirmations of reinvestments are usually
               mailed to shareholders within ten days after the record date. Any
               election (which may be made on the New Account Application form
               or by phone) will apply to dividends and distributions the record
               dates of which fall on or after the date that a Fund receives
               such notice. Changes to distribution options must be received at
               least three days prior to the record date to be effective for
               such date. Investors receiving cash distributions and dividends
               may elect in writing or by phone to change back to automatic
               reinvestment at any time.
 
                                                                              35
<PAGE> 
Redemption of shares
 
               Procedures for redemption of Shares are set forth in the
               Shareholder's Manual section of the Prospectus. Shares normally
               will be redeemed for cash, although each Fund retains the right
               to redeem Shares in kind under unusual circumstances, in order to
               protect the interests of remaining shareholders, by delivery of
               securities selected from its assets at its discretion. However,
               the Funds are governed by Rule 18f-1 under the 1940 Act, which
               requires each Fund to redeem Shares solely in cash up to the
               lesser of $250,000 or 1% of the net asset value of that Fund
               during any 90-day period for any one shareholder. Should
               redemptions by any shareholder exceed such limitation, their Fund
               will have the option of redeeming the excess in cash or in kind.
               If Shares are redeemed in kind, the redeeming shareholder might
               incur brokerage costs in converting the assets to cash. The
               method of valuing securities used to make redemptions in kind
               will be the same as the method of valuing portfolio securities
               described under "Determination of Net Asset Value" and such
               valuation will be made as of the same time the redemption price
               is determined.
 
               The right to require the Funds to redeem Shares may be suspended,
               or the date of payment may be postponed, whenever (1) trading on
               the NYSE is restricted, as determined by the SEC, or the NYSE is
               closed except for holidays and weekends, (2) the SEC permits such
               suspension and so orders, or (3) an emergency exists as
               determined by the SEC so that disposal of securities or
               determination of NAV is not reasonably practicable.
 
 36
<PAGE> 
Shareholder accounts
 
               Detailed information about the general procedures for shareholder
               accounts and specific types of accounts is set forth in the
               Prospectus. Applications for specific types of accounts may be
               obtained by calling the Funds at 1-800-525-3713 or writing to the
               Funds at P.O. Box 173375, Denver, Colorado 80217-3375.
 
SYSTEMATIC REDEMPTIONS
 
               As stated in the Shareholder's Manual section of the Prospectus,
               if you have a regular account or are eligible for distributions
               from a retirement plan, you may establish a systematic redemption
               option. The payments will be made from the proceeds of periodic
               redemptions of Shares in the account at the net asset value.
               Depending on the size or frequency of the disbursements
               requested, and the fluctuation in value of the Shares in the
               Fund's portfolio, redemptions for the purpose of making such
               disbursements may reduce or even exhaust the shareholder's
               account. Either an investor or their Fund, by written notice to
               the other, may terminate the investor's systematic redemption
               option without penalty at any time.
 
               Information about requirements to establish a systematic
               redemption option may be obtained by writing or calling the Funds
               at the address or phone number shown above.
 
                                                                              37
<PAGE> 
Tax-Deferred accounts
 
               The Funds offer several different types of tax-deferred
               retirement plans that an investor may establish to invest in
               Shares, depending on rules prescribed by the Internal Revenue
               Code of 1986 and the regulations thereunder (the "Code").
               Traditional and Roth Individual Retirement Accounts may be used
               by most individuals who have taxable compensation. Simplified
               Employee Pensions and the Defined Contribution Plans may be used
               by most employers, including corporations, partnerships and sole
               proprietors, for the benefit of business owners and their
               employees. Education IRAs allow individuals, subject to certain
               income limitations, to contribute up to $500 annually on behalf
               of any child under the age of 18. In addition, the Funds offer a
               Section 403(b)(7) Plan for employees of educational organizations
               and other qualifying tax-exempt organizations. Investors should
               consult their tax adviser or legal counsel before selecting a
               tax-deferred account.
 
   
               Contributions under Traditional and Roth IRAs, Education IRAs,
               SEPs, Defined Contribution Plans (Profit Sharing or Money
               Purchase Pension Plans) and Section 403(b)(7) Plans are subject
               to specific contribution limitations. Generally, such
               contributions may be invested at the direction of the
               participant. The investment is then held by Investors Fiduciary
               Trust Company as custodian. Each participant's account is charged
               an annual fee of $12 per taxpayer identification number no matter
               how many tax-deferred accounts the participant has with Janus.
    
 
               Distributions from tax deferred accounts may be subject to
               ordinary income tax and may be subject to an additional 10% tax
               if withdrawn prior to age 59 1/2 or used for a nonqualifying
               purpose. Several exceptions to the general rule may apply.
               Additionally, shareholders generally must start withdrawing
               retirement plan assets no later than April 1 of the year after
               they reach age 70 1/2. Several exceptions to these general rules
               may apply and several methods exist to determine the amount and
               timing of the minimum annual distribution (if any). Shareholders
               should consult with their tax adviser or legal counsel prior to
               receiving any distribution from any tax-deferred plan, in order
               to determine the income tax impact of any such distribution.
 
               To receive additional information about Traditional and Roth
               IRAs, SEPs, Defined Contribution Plans and Section 403(b)(7)
               Plans
 
 38
<PAGE> 
 
               along with the necessary materials to establish an account,
               please call the Funds at 1-800-525-3713 or write to the Funds at
               P.O. Box 173375, Denver, Colorado 80217-3375. No contribution to
               a Traditional or Roth IRA, SEP, Defined Contribution Plan or
               Section 403(b)(7) Plan can be made until the appropriate forms to
               establish any such plan have been completed.
 
                                                                              39
<PAGE> 
Dividends and tax status
 
   
               Dividends representing substantially all of the net investment
               income and any net realized gains on sales of securities are
               declared daily, Saturdays, Sundays and holidays included, and
               distributed on the last business day of each month. If a month
               begins on a Saturday, Sunday, or holiday, dividends for those
               days are declared at the end of the preceding month and
               distributed on the first business day of the month. A shareholder
               may receive dividends in cash or may choose to have dividends
               automatically reinvested in a Fund's Shares. As described in the
               Prospectus, Shares purchased by wire on a bank business day will
               receive that day's dividend if the purchase is effected at or
               prior to 3:00 p.m. (New York time) for Janus Money Market Fund,
               5:00 p.m. for Janus Government Money Market Fund and 12:00 p.m.
               for Janus Tax-Exempt Money Market Fund. Otherwise, such Shares
               will begin to accrue dividends on the following day. Orders for
               purchase accompanied by a check or other negotiable bank draft
               will be accepted and effected as of 4:00 p.m. (New York time),
               (5:00 p.m. for Janus Government Money Market Fund) on the day of
               receipt and such Shares will begin to accrue dividends on the
               first bank business day following receipt of the order. Requests
               for redemption of Shares of a Fund will be redeemed at the next
               determined net asset value. If processed by 4:00 p.m. (New York
               time), (5:00 p.m. for Janus Government Money Market Fund) such
               redemption will generally include dividends declared through the
               day of redemption. However, redemption requests made by wire that
               are received prior to 3:00 p.m. (New York time) for Janus Money
               Market Fund, 5:00 p.m. for Janus Government Money Market Fund and
               12:00 p.m. for Janus Tax-Exempt Money Market Fund on a bank
               business day will result in Shares being redeemed that day and no
               dividend will be accrued for such day. Proceeds of such a
               redemption will normally be sent to the predesignated bank
               account on that day, but that day's dividend will not be
               received. If shares of a Fund were originally purchased by check
               or through an Automated Clearing House transaction, the Fund may
               delay transmittal of redemption proceeds up to 15 days in order
               to ensure that purchase funds have been collected. Closing times
               for purchase and redemption of Shares may be changed for days in
               which the bond market or the NYSE close early.
    
 
 40
<PAGE> 
 
               Distributions for all of the Funds (except Janus Tax-Exempt Money
               Market Fund) are taxable income and are subject to federal income
               tax (except for shareholders exempt from income tax), whether
               such distributions are received in cash or are reinvested in
               additional Shares. Full information regarding the tax status of
               income dividends and any capital gains distributions will be
               mailed to shareholders for tax purposes on or before January 31st
               of each year. As described in detail in the Prospectus, Janus
               Tax-Exempt Money Market Fund anticipates that substantially all
               income dividends it pays will be exempt from federal income tax,
               although dividends attributable to interest on taxable
               investments, together with distributions from any net realized
               short- or long-term capital gains, are taxable.
 
               The Funds intend to qualify as regulated investment companies by
               satisfying certain requirements prescribed by Subchapter M of the
               Code. Accordingly, a Fund will invest no more than 25% of its
               total assets in a single issuer (other than U.S. government
               securities).
 
               Some money market securities employ a trust or other similar
               structure to modify the maturity, price characteristics, or
               quality of financial assets. For example, put features can be
               used to modify the maturity of a security, or interest rate
               adjustment features can be used to enhance price stability. If
               the structure does not perform as intended, adverse tax or
               investment consequences may result. Neither the Internal Revenue
               Service nor any other regulatory authority has ruled definitively
               on certain legal issues presented by structured securities.
               Future tax or other regulatory determinations could adversely
               affect the value, liquidity, or tax treatment of the income
               received from these securities or the nature and timing of
               distributions made by a Fund.
 
                                                                              41
<PAGE> 
Principal shareholders
 
   
               As of January 20, 1999, the officers and Trustees as a group
               owned less than 1% of the outstanding Shares.
    
 
   
               As of January 20, 1999, Janus Capital Corporation, 100 Fillmore
               Street, Denver, CO 80206-4928, owned 6.15% of the Shares of Janus
               Money Market Fund.
    
 
 42
<PAGE> 
Miscellaneous information
 
               Each Fund is a series of the Trust, a Massachusetts business
               trust that was created on February 11, 1986. The Trust is an
               open-end management investment company registered under the 1940
               Act. As of the date of this SAI, the Trust offers 21 separate
               series, three of which currently offer three classes of shares.
 
               Janus Capital reserves the right to the name "Janus." In the
               event that Janus Capital does not continue to provide investment
               advice to the Funds, the Funds must cease to use the name "Janus"
               as soon as reasonably practicable.
 
               Under Massachusetts law, shareholders of the Funds could, under
               certain circumstances, be held liable for the obligations of
               their Fund. However, the Agreement and Declaration of Trust (the
               "Declaration of Trust") disclaims shareholder liability for acts
               or obligations of the Funds and requires that notice of this
               disclaimer be given in each agreement, obligation or instrument
               entered into or executed by the Funds or the Trustees. The
               Declaration of Trust also provides for indemnification from the
               assets of the Funds for all losses and expenses of any Fund
               shareholder held liable for the obligations of their Fund. Thus,
               the risk of a shareholder incurring a financial loss on account
               of its liability as a shareholder of one of the Funds is limited
               to circumstances in which their Fund would be unable to meet its
               obligations. The possibility that these circumstances would occur
               is remote. The Trustees intend to conduct the operations of the
               Funds to avoid, to the extent possible, liability of shareholders
               for liabilities of their Fund.
 
SHARES OF THE TRUST
 
               The Trust is authorized to issue an unlimited number of shares of
               beneficial interest with a par value of one cent per share for
               each series of the Trust. Shares of each Fund are fully paid and
               nonassessable when issued. All shares of a Fund participate
               equally in dividends and other distributions by such Fund, and in
               residual assets of that Fund in the event of liquidation. Shares
               of each Fund have no preemptive, conversion or subscription
               rights.
 
                                                                              43
<PAGE> 
 
               The Trust is authorized to issue multiple classes of shares for
               each Fund. Currently, Janus Money Market Fund, Janus Government
               Money Market Fund and Janus Tax-Exempt Money Market Fund each
               offer three classes of shares by separate prospectuses. The
               Shares discussed in this SAI are offered to the general public. A
               second class of shares, Service Shares, is offered through banks
               and other financial institutions that meet minimum investment
               requirements in connection with trust accounts, cash management
               programs and similar programs. A third class of shares,
               Institutional Shares, is offered only to clients meeting certain
               minimum investment criteria.
 
SHAREHOLDER MEETINGS
 
               The Trust does not intend to hold annual shareholder meetings.
               However, special meetings may be called for a specific Fund or
               for the Trust as a whole for purposes such as electing or
               removing Trustees, terminating or reorganizing the Trust,
               changing fundamental policies, or for any other purpose requiring
               a shareholder vote under the 1940 Act. Separate votes are taken
               by each Fund only if a matter affects or requires the vote of
               only that Fund or that Fund's interest in the matter differs from
               the interest of other portfolios of the Trust. As a shareholder,
               you are entitled to one vote for each share that you own.
 
VOTING RIGHTS
 
               The present Trustees were elected at a meeting of shareholders
               held on July 10, 1992 with the exception of Mr. Craig and Mr.
               Rothe who were appointed by the Trustees as of June 30, 1995 and
               January 1, 1997, respectively. Under the Declaration of Trust,
               each Trustee will continue in office until the termination of the
               Trust or his earlier death, retirement, resignation, bankruptcy,
               incapacity or removal. Vacancies will be filled by a majority of
               the remaining Trustees, subject to the 1940 Act. Therefore, no
               annual or regular meetings of shareholders normally will be held,
               unless otherwise required by the Declaration of Trust or the 1940
               Act. Subject to the foregoing, shareholders have the power to
               vote to elect or remove Trustees, to terminate or reorganize
               their Fund, to amend the Declaration of Trust, to bring certain
               derivative actions
 
 44
<PAGE> 
 
               and on any other matters on which a shareholder vote is required
               by the 1940 Act, the Declaration of Trust, the Trust's Bylaws or
               the Trustees.
 
               As mentioned above in "Shareholder Meetings," each share of each
               series of the Trust has one vote (and fractional votes for
               fractional shares). Shares of all series of the Trust have
               noncumulative voting rights, which means that the holders of more
               than 50% of the shares of all series of the Trust voting for the
               election of Trustees can elect 100% of the Trustees if they
               choose to do so and, in such event, the holders of the remaining
               shares will not be able to elect any Trustees.
 
INDEPENDENT ACCOUNTANTS
 
               PricewaterhouseCoopers LLP, 950 Seventeenth Street, Suite 2500,
               Denver, Colorado 80202, independent accountants for the Funds,
               audit the Funds' annual financial statements and prepare their
               tax returns.
 
REGISTRATION STATEMENT
 
               The Trust has filed with the SEC, Washington, D.C., a
               Registration Statement under the Securities Act of 1933, as
               amended, with respect to the securities to which this SAI
               relates. If further information is desired with respect to the
               Funds or such securities, reference is made to the Registration
               Statement and the exhibits filed as a part thereof.
 
                                                                              45
<PAGE> 
Financial statements
 
   
               The following audited financial statements of the Funds for the
               period ended October 31, 1998 are hereby incorporated into this
               SAI by reference to the Funds' Annual Report dated October 31,
               1998.
    
 
DOCUMENTS INCORPORATED BY REFERENCE TO THE ANNUAL REPORT
 
               Schedules of Investments as of October 31, 1998
 
               Statements of Operations for the period ended October 31, 1998
 
               Statements of Assets and Liabilities as of October 31, 1998
 
               Statements of Changes in Net Assets for the periods ended October
               31, 1998 and 1997
 
               Financial Highlights for each of the periods indicated
 
               Notes to Financial Statements
 
               Report of Independent Accountants
 
               The portions of such Annual Report that are not specifically
               listed above are not incorporated by reference into this SAI and
               are not part of the Registration Statement.
 
 46
<PAGE> 
Appendix A
 
DESCRIPTION OF SECURITIES RATINGS
 
MOODY'S AND STANDARD & POOR'S
 
               MUNICIPAL AND CORPORATE BONDS AND MUNICIPAL LOANS. The two
               highest ratings of Standard & Poor's Ratings Services for
               municipal and corporate bonds are AAA and AA. Bonds rated AAA
               have the highest rating assigned by S&P to a debt obligation.
               Capacity to pay interest and repay principal is extremely strong.
               Bonds rated AA have a very strong capacity to pay interest and
               repay principal and differ from the highest rated issues only in
               a small degree. The AA rating may be modified by the addition of
               a plus (+) or minus (-) sign to show relative standing within
               that rating category.
 
               The two highest ratings of Moody's Investors Service, Inc. for
               municipal and corporate bonds are Aaa and Aa. Bonds rated Aaa are
               judged by Moody's to be of the best quality. Bonds rated Aa are
               judged to be of high quality by all standards. Together with the
               Aaa group, they comprise what are generally known as high-grade
               bonds. Moody's states that Aa bonds are rated lower than the best
               bonds because margins of protection or other elements make
               long-term risks appear somewhat larger than Aaa securities. The
               generic rating Aa may be modified by the addition of the numerals
               1, 2 or 3. The modifier 1 indicates that the security ranks in
               the higher end of the Aa rating category; the modifier 2
               indicates a mid-range ranking; and the modifier 3 indicates that
               the issue ranks in the lower end of such rating category.
 
               SHORT-TERM MUNICIPAL LOANS. S&P's highest rating for short-term
               municipal loans is SP-1. S&P states that short-term municipal
               securities bearing the SP-1 designation have a strong capacity to
               pay principal and interest. Those issues rated SP-1 which are
               determined to possess a very strong capacity to pay debt service
               will be given a plus (+) designation. Issues rated SP-2 have
               satisfactory capacity to pay principal and interest with some
               vulnerability to adverse financial and economic changes over the
               term of the notes.
 
               Moody's highest rating for short-term municipal loans is
               MIG-1/VMIG-1. Moody's states that short-term municipal securities
               rated MIG-1/VMIG-1 are of the best quality, enjoying strong
 
                                                                              47
<PAGE> 
 
               protection from established cash flows of funds for their
               servicing or from established and broad-based access to the
               market for refinancing, or both. Loans bearing the MIG-2/VMIG-2
               designation are of high quality, with margins of protection ample
               although not so large as in the MIG-1/VMIG-1 group.
 
               OTHER SHORT-TERM DEBT SECURITIES. Prime-1 and Prime-2 are the two
               highest ratings assigned by Moody's for other short-term debt
               securities and commercial paper, and A-1 and A-2 are the two
               highest ratings for commercial paper assigned by S&P. Moody's
               uses the numbers 1, 2 and 3 to denote relative strength within
               its highest classification of Prime, while S&P uses the numbers
               1, 2 and 3 to denote relative strength within its highest
               classification of A. Issuers rated Prime-1 by Moody's have a
               superior ability for repayment of senior short-term debt
               obligations and have many of the following characteristics:
               leading market positions in well-established industries, high
               rates of return on funds employed, conservative capitalization
               structure with moderate reliance on debt and ample asset
               protection, broad margins in earnings coverage of fixed financial
               charges and high internal cash generation, and well established
               access to a range of financial markets and assured sources of
               alternate liquidity. Issuers rated Prime-2 by Moody's have a
               strong ability for repayment of senior short-term debt
               obligations and display many of the same characteristics
               displayed by issuers rated Prime-1, but to a lesser degree.
               Issuers rated A-1 by S&P carry a strong degree of safety
               regarding timely repayment. Those issues determined to possess
               extremely strong safety characteristics are denoted with a plus
               (+) designation. Issuers rated A-2 by S&P carry a satisfactory
               degree of safety regarding timely repayment.
 
 48
<PAGE> 
 
FITCH
 
<TABLE>
                <S>                          <C>
                BOND RATING                  EXPLANATION
                ----------------------------------------------------------------
                F-1+........................ Exceptionally strong credit
                                             quality. Issues assigned this
                                             rating are regarded as having the
                                             strongest degree of assurance for
                                             timely payment.
                F-1......................... Very strong credit quality. Issues
                                             assigned this rating reflect an
                                             assurance for timely payment only
                                             slightly less in degree than issues
                                             rated F-1+.
                F-2......................... Good credit quality. Issues
                                             assigned this rating have a
                                             satisfactory degree of assurance
                                             for timely payments, but the margin
                                             of safety is not as great as the F-
                                             1+ and F-1 ratings.
</TABLE>
 
DUFF & PHELPS INC.
 
<TABLE>
                <S>                          <C>
                BOND RATING                  EXPLANATION
                ----------------------------------------------------------------
                Duff 1+..................... Highest certainty of timely
                                             payment. Short-term liquidity,
                                             including internal operating
                                             factors and/or ready access to
                                             alternative sources of funds, is
                                             clearly outstanding, and safety is
                                             just below risk-free U.S. Treasury
                                             short-term obligations.
                Duff 1...................... Very high certainty of timely
                                             payment. Liquidity factors are
                                             excellent and supported by good
                                             fundamental protection factors.
                                             Risk factors are minor.
                Duff 1-..................... High certainty of timely payment.
                                             Liquidity factors are strong and
                                             supported by good fundamental
                                             protection factors. Risk factors
                                             are very small.
                Duff 2...................... Good certainty of timely payment.
                                             Liquidity factors and company
                                             fundamentals are sound. Although
                                             ongoing funding needs may enlarge
                                             total financing requirements,
                                             access to capital markets is good.
                                             Risk factors are small.
</TABLE>
 
                                                                              49
<PAGE> 
 
THOMSON BANKWATCH, INC.
 
<TABLE>
                <S>                          <C>
                BOND RATING                  EXPLANATION
                ----------------------------------------------------------------
                TBW-1....................... The highest category; indicates a
                                             very high degree of likelihood that
                                             principal and interest will be paid
                                             on a timely basis.
                TBW-2                        The second highest category; while
                                             the degree of safety regarding
                                             timely repayment of principal and
                                             interest is strong, the relative
                                             degree of safety is not as high as
                                             for issues rated TBW-1.
                TBW-3....................... The lowest investment grade
                                             category; indicates that while more
                                             susceptible to adverse developments
                                             (both internal and external) than
                                             obligations with higher ratings,
                                             capacity to service principal and
                                             interest in a timely fashion is
                                             considered adequate.
                TBW-4....................... The lowest rating category; this
                                             rating is regarded as
                                             non-investment grade and therefore
                                             speculative.
</TABLE>
 
IBCA, INC.
 
<TABLE>
                <S>                          <C>
                BOND RATING                  EXPLANATION
                ----------------------------------------------------------------
                A1+......................... Obligations supported by the
                                             highest capacity for timely
                                             repayment. Where issues possess a
                                             particularly strong credit feature,
                                             a rating of A1+ is assigned.
                A2.......................... Obligations supported by a good
                                             capacity for timely repayment.
                A3.......................... Obligations supported by a
                                             satisfactory capacity for timely
                                             repayment.
                B........................... Obligations for which there is an
                                             uncertainty as to the capacity to
                                             ensure timely repayment.
                C                            Obligations for which there is a
                                             high risk of default or which are
                                             currently in default.
</TABLE>
 
 50
<PAGE> 
Appendix B
 
DESCRIPTION OF MUNICIPAL SECURITIES
 
               MUNICIPAL NOTES generally are used to provide for short-term
               capital needs and usually have maturities of one year or less.
               They include the following:
 
               1. PROJECT NOTES, which carry a U.S. government guarantee, are
               issued by public bodies (called "local issuing agencies") created
               under the laws of a state, territory, or U.S. possession. They
               have maturities that range up to one year from the date of
               issuance. Project Notes are backed by an agreement between the
               local issuing agency and the Federal Department of Housing and
               Urban Development. These Notes provide financing for a wide range
               of financial assistance programs for housing, redevelopment, and
               related needs (such as low-income housing programs and renewal
               programs).
 
               2. TAX ANTICIPATION NOTES are issued to finance working capital
               needs of municipalities. Generally, they are issued in
               anticipation of various seasonal tax revenues, such as income,
               sales, use and business taxes, and are payable from these
               specific future taxes.
 
               3. REVENUE ANTICIPATION NOTES are issued in expectation of
               receipt of other types of revenues, such as Federal revenues
               available under the Federal Revenue Sharing Programs.
 
               4. BOND ANTICIPATION NOTES are issued to provide interim
               financing until long-term financing can be arranged. In most
               cases, the long-term bonds then provide the money for the
               repayment of the Notes.
 
               5. CONSTRUCTION LOAN NOTES are sold to provide construction
               financing. After successful completion and acceptance, many
               projects receive permanent financing through the Federal Housing
               Administration under the Federal National Mortgage Association
               ("Fannie Mae") or the Government National Mortgage Association
               ("Ginnie Mae").
 
               6. TAX-EXEMPT COMMERCIAL PAPER is a short-term obligation with a
               stated maturity of 365 days or less. It is issued by agencies of
               state and local governments to finance seasonal working capital
               needs or as short-term financing in anticipation of longer term
               financing.
 
                                                                              51
<PAGE> 
 
               MUNICIPAL BONDS, which meet longer term capital needs and
               generally have maturities of more than one year when issued, have
               three principal classifications:
 
               1. GENERAL OBLIGATION BONDS are issued by such entities as
               states, counties, cities, towns and regional districts. The
               proceeds of these obligations are used to fund a wide range of
               public projects, including construction or improvement of
               schools, highways and roads, and water and sewer systems. The
               basic security behind General Obligation Bonds is the issuer's
               pledge of its full faith and credit and taxing power for the
               payment of principal and interest. The taxes that can be levied
               for the payment of debt service may be limited or unlimited as to
               the rate or amount of special assessments.
 
               2. REVENUE BONDS in recent years have come to include an
               increasingly wide variety of types of municipal obligations. As
               with other kinds of municipal obligations, the issuers of revenue
               bonds may consist of virtually any form of state or local
               governmental entity, including states, state agencies, cities,
               counties, authorities of various kinds, such as public housing or
               redevelopment authorities, and special districts, such as water,
               sewer or sanitary districts. Generally, revenue bonds are secured
               by the revenues or net revenues derived from a particular
               facility, group of facilities, or, in some cases, the proceeds of
               a special excise or other specific revenue source. Revenue bonds
               are issued to finance a wide variety of capital projects
               including electric, gas, water and sewer systems; highways,
               bridges, and tunnels; port and airport facilities; colleges and
               universities; and hospitals. Many of these bonds provide
               additional security in the form of a debt service reserve fund to
               be used to make principal and interest payments. Various forms of
               credit enhancement, such as a bank letter of credit or municipal
               bond insurance, may also be employed in revenue bond issues.
               Housing authorities have a wide range of security, including
               partially or fully insured mortgages, rent subsidized and/or
               collateralized mortgages, and/or the net revenues from housing or
               other public projects. Some authorities provide further security
               in the form of a state's ability (without
 
 52
<PAGE> 
 
               obligation) to make up deficiencies in the debt service reserve
               fund.
 
               In recent years, revenue bonds have been issued in large volumes
               for projects that are privately owned and operated (see 3 below).
 
               3. PRIVATE ACTIVITY BONDS are considered municipal bonds if the
               interest paid thereon is exempt from Federal income tax and are
               issued by or on behalf of public authorities to raise money to
               finance various privately operated facilities for business and
               manufacturing, housing and health. These bonds are also used to
               finance public facilities such as airports, mass transit systems
               and ports. The payment of the principal and interest on such
               bonds is dependent solely on the ability of the facility's user
               to meet its financial obligations and the pledge, if any, of real
               and personal property as security for such payment.
 
               While, at one time, the pertinent provisions of the Internal
               Revenue Code permitted private activity bonds to bear tax-exempt
               interest in connection with virtually any type of commercial or
               industrial project (subject to various restrictions as to
               authorized costs, size limitations, state per capita volume
               restrictions, and other matters), the types of qualifying
               projects under the Code have become increasingly limited,
               particularly since the enactment of the Tax Reform Act of 1986.
               Under current provisions of the Code, tax-exempt financing
               remains available, under prescribed conditions, for certain
               privately owned and operated rental multi-family housing
               facilities, nonprofit hospital and nursing home projects,
               airports, docks and wharves, mass commuting facilities and solid
               waste disposal projects, among others, and for the refunding
               (that is, the tax-exempt refinancing) of various kinds of other
               private commercial projects originally financed with tax-exempt
               bonds. In future years, the types of projects qualifying under
               the Code for tax-exempt financing are expected to become
               increasingly limited.
 
               Because of terminology formerly used in the Internal Revenue
               Code, virtually any form of private activity bond may still be
               referred to as an "industrial development bond," but more and
 
                                                                              53
<PAGE> 
 
               more frequently revenue bonds have become classified according to
               the particular type of facility being financed, such as hospital
               revenue bonds, nursing home revenue bonds, multi-family housing
               revenues bonds, single family housing revenue bonds, industrial
               development revenue bonds, solid waste resource recovery revenue
               bonds, and so on.
 
               OTHER MUNICIPAL OBLIGATIONS, incurred for a variety of financing
               purposes, include: municipal leases, which may take the form of a
               lease or an installment purchase or conditional sale contract,
               are issued by state and local governments and authorities to
               acquire a wide variety of equipment and facilities such as fire
               and sanitation vehicles, telecommunications equipment and other
               capital assets. Municipal leases frequently have special risks
               not normally associated with general obligation or revenue bonds.
               Leases and installment purchase or conditional sale contracts
               (which normally provide for title to the leased asset to pass
               eventually to the government issuer) have evolved as a means for
               governmental issuers to acquire property and equipment without
               meeting the constitutional and statutory requirements for the
               issuance of debt. The debt-issuance limitations of many state
               constitutions and statutes are deemed to be inapplicable because
               of the inclusion in many leases or contracts of
               "non-appropriation" clauses that provide that the governmental
               issuer has no obligation to make future payments under the lease
               or contract unless money is appropriated for such purpose by the
               appropriate legislative body on a yearly or other periodic basis.
               To reduce this risk, the Fund will only purchase municipal leases
               subject to a non-appropriation clause when the payment of
               principal and accrued interest is backed by an unconditional
               irrevocable letter of credit, or guarantee of a bank or other
               entity that meets the criteria described in the Prospectus.
 
               Tax-exempt bonds are also categorized according to whether the
               interest is or is not includible in the calculation of
               alternative minimum taxes imposed on individuals, according to
               whether the costs of acquiring or carrying the bonds are or are
               not deductible in part by banks and other financial institutions,
               and according to other criteria relevant for Federal income tax
               purposes. Due to the
 
 54
<PAGE> 
 
               increasing complexity of Internal Revenue Code and related
               requirements governing the issuance of tax-exempt bonds, industry
               practice has uniformly required, as a condition to the issuance
               of such bonds, but particularly for revenue bonds, an opinion of
               nationally recognized bond counsel as to the tax-exempt status of
               interest on the bonds.
 
                                                                              55
<PAGE> 
 
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 58
<PAGE> 
 
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                                                                              59
<PAGE> 
 
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 60
<PAGE> 
 
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<PAGE> 
 
        [JANUS LOGO]
                1-800-525-3713
                P.O. Box 173375
                Denver, Colorado 80217-3375
                janus.com
 
  3171
<PAGE> 
 
                           [JANUS LOGO]
 
                    Janus Investment Fund
                    Janus Venture Fund
 
                    100 Fillmore Street
                    Denver, CO 80206-4928
                    (800) 525-3713
 
                    Statement of Additional Information
 
                    February 17, 1999
 
                    Janus Venture Fund is a no-load, diversified mutual fund
                    that seeks capital appreciation. The Fund normally
                    invests at least 50% of its equity assets in securities
                    issued by small-sized companies. Small-sized companies
                    are those who have market capitalizations of less than $1
                    billion or annual gross revenues of less than $500
                    million. Subject to this policy, the Fund may also invest
                    in larger issuers. Depending upon its portfolio managers'
                    opinion of prevailing market, financial and economic
                    conditions, the Fund may at times hold substantial
                    positions in cash or interest-bearing securities.
 
                    The Fund is a separate series of Janus Investment Fund, a
                    Massachusetts business trust.
 
                    The Fund has discontinued public sales of its shares to
                    new investors. However, shareholders who maintain open
                    Fund accounts are permitted to continue to purchase
                    shares of the Fund and to reinvest any dividends and/or
                    capital gains distributions in shares of the Fund. Once a
                    shareholder's Fund account is closed, it may not be
                    possible for that shareholder to purchase additional Fund
                    shares. See the "Shareholder's Manual" section of the
                    Prospectus for more details. The Fund may resume sales of
                    its shares at some future date, although it has no
                    present intention of doing so.
 
                    This Statement of Additional Information is not a
                    Prospectus and should be read in conjunction with the
                    Fund's Prospectus dated February 17, 1999, which is
                    incorporated by reference into this SAI and may be
                    obtained from the Trust at the above phone number or
                    address. This SAI contains additional and more detailed
                    information about the Fund's operations and activities
                    than the Prospectus. The Annual Report, which contains
                    important financial information about the Fund, is
                    incorporated by reference into this SAI and is also
                    available, without charge, at the above phone number or
                    address.
<PAGE> 
 
[JANUS LOGO]
<PAGE> 
 
                                                             Table of contents
 
<TABLE>
                <S>                                               <C>
                Classification, Portfolio Turnover, Investment
                Policies and Restrictions, and Investment
                Strategies and Risks............................    2
                Investment Adviser..............................   38
                Custodian, Transfer Agent and Certain
                Affiliations....................................   42
                Portfolio Transactions and Brokerage............   44
                Trustees and Officers...........................   48
                Purchase of Shares..............................   54
                   Net Asset Value Determination................   54
                   Reinvestment of Dividends and Distributions..   55
                Redemption of Shares............................   57
                Shareholder Accounts............................   58
                   Telephone Transactions.......................   58
                   Systematic Redemptions.......................   58
                Tax-Deferred Accounts...........................   59
                Income Dividends, Capital Gains Distributions
                and Tax Status..................................   61
                Principal Shareholders..........................   62
                Miscellaneous Information.......................   63
                   Shares of the Trust..........................   64
                   Shareholder Meetings.........................   64
                   Voting Rights................................   64
                   Master/Feeder Option.........................   65
                   Independent Accountants......................   65
                   Registration Statement.......................   65
                Performance Information.........................   66
                Financial Statements............................   67
                Appendix A......................................   68
</TABLE>
 
                                                                               1
<PAGE> 
Classification, portfolio turnover, 
                investment policies 
                and restrictions, and 
                investment strategies 
                and risks
 
CLASSIFICATION
 
   
               The Fund is a series of the Trust, an open-end, management
               investment company. The Investment Company Act of 1940 ("1940
               Act") classifies mutual funds as either diversified or
               nondiversified, and the Fund is a diversified fund.
    
 
PORTFOLIO TURNOVER
 
   
               The Prospectus includes a discussion of portfolio turnover
               policies. The Fund's portfolio turnover rates (total purchases or
               sales, whichever is less, compared to average monthly value of
               portfolio securities) for the fiscal years ended October 31, 1998
               and October 31, 1997, were 90% and 146%, respectively.
    
 
INVESTMENT POLICIES AND RESTRICTIONS
 
               The Fund is subject to certain fundamental policies and
               restrictions that may not be changed without shareholder
               approval. Shareholder approval means approval by the lesser of
               (i) more than 50% of the outstanding voting securities of the
               Trust (or the Fund if a matter affects just the Fund), or (ii)
               67% or more of the voting securities present at a meeting if the
               holders of more than 50% of the outstanding voting securities of
               the Trust (or the Fund) are present or represented by proxy. As
               fundamental policies, the Fund may not:
 
               (1) Own more than 10% of the outstanding voting securities of any
               one issuer and, as to seventy-five percent (75%) of the value of
               its total assets, purchase the securities of any one issuer
               (except cash items and "government securities" as defined under
               the 1940 Act, if immediately after and as a result of such
               purchase, the value of the holdings of the Fund in the securities
               of such issuer exceeds 5% of the value of the Fund's total
               assets.
 
 2
<PAGE> 
 
               (2) Invest 25% or more of the value of its total assets in any
               particular industry (other than U.S. government securities).
 
               (3) Invest directly in real estate or interests in real estate;
               however, the Fund may own debt or equity securities issued by
               companies engaged in those businesses.
 
               (4) Purchase or sell physical commodities other than foreign
               currencies unless acquired as a result of ownership of securities
               (but this limitation shall not prevent the Fund from purchasing
               or selling options, futures, swaps and forward contracts or from
               investing in securities or other instruments backed by physical
               commodities).
 
               (5) Lend any security or make any other loan if, as a result,
               more than 25% of its total assets would be lent to other parties
               (but this limitation does not apply to purchases of commercial
               paper, debt securities or repurchase agreements).
 
               (6) Act as an underwriter of securities issued by others, except
               to the extent that the Fund may be deemed an underwriter in
               connection with the disposition of portfolio securities of the
               Fund.
 
               As a fundamental policy, the Fund may, notwithstanding any other
               investment policy or limitation (whether or not fundamental),
               invest all of its assets in the securities of a single open-end
               management investment company with substantially the same
               fundamental investment objective, policies and limitations as the
               Fund.
 
               The Trustees have adopted additional investment restrictions for
               the Fund. These restrictions are operating policies of the Fund
               and may be changed by the Trustees without shareholder approval.
               The additional investment restrictions adopted by the Trustees to
               date include the following:
 
               (a) The Fund will not (i) enter into any futures contracts and
               related options for purposes other than bona fide hedging
               transactions within the meaning of Commodity Futures Trading
               Commission ("CFTC") regulations if the aggregate initial margin
 
                                                                               3
<PAGE> 
 
               and premiums required to establish positions in futures contracts
               and related options that do not fall within the definition of
               bona fide hedging transactions will exceed 5% of the fair market
               value of the Fund's net assets, after taking into account
               unrealized profits and unrealized losses on any such contracts it
               has entered into; and (ii) enter into any futures contracts if
               the aggregate amount of the Fund's commitments under outstanding
               futures contracts positions would exceed the market value of its
               total assets.
 
               (b) The Fund does not currently intend to sell securities short,
               unless it owns or has the right to obtain securities equivalent
               in kind and amount to the securities sold short without the
               payment of any additional consideration therefor, and provided
               that transactions in futures, options, swaps and forward
               contracts are not deemed to constitute selling securities short.
 
               (c) The Fund does not currently intend to purchase securities on
               margin, except that the Fund may obtain such short-term credits
               as are necessary for the clearance of transactions, and provided
               that margin payments and other deposits in connection with
               transactions in futures, options, swaps and forward contracts
               shall not be deemed to constitute purchasing securities on
               margin.
 
               (d) The Fund may not mortgage or pledge any securities owned or
               held by the Fund in amounts that exceed, in the aggregate, 15% of
               the Fund's net asset value, provided that this limitation does
               not apply to reverse repurchase agreements, deposits of assets to
               margin, guarantee positions in futures, options, swaps or forward
               contracts, or the segregation of assets in connection with such
               contracts.
 
               (e) The Fund may borrow money for temporary or emergency purposes
               (not for leveraging or investment) in an amount not exceeding 25%
               of the value of its total assets (including the amount borrowed)
               less liabilities (other than borrowings). If borrowings exceed
               25% of the value of the Fund's total assets by reason of a
               decline in net assets, the Fund will reduce its borrowings within
               three business days to the extent necessary to comply with the
               25% limitation. This policy shall not prohibit
 
 4
<PAGE> 
 
               reverse repurchase agreements, deposits of assets to margin or
               guarantee positions in futures, options, swaps or forward
               contracts, or the segregation of assets in connection with such
               contracts.
 
               (f) The Fund does not currently intend to purchase any security
               or enter into a repurchase agreement if, as a result, more than
               15% of its net assets would be invested in repurchase agreements
               not entitling the holder to payment of principal and interest
               within seven days and in securities that are illiquid by virtue
               of legal or contractual restrictions on resale or the absence of
               a readily available market. The Trustees, or the Fund's
               investment adviser acting pursuant to authority delegated by the
               Trustees, may determine that a readily available market exists
               for securities eligible for resale pursuant to Rule 144A under
               the Securities Act of 1933 ("Rule 144A Securities"), or any
               successor to such rule, Section 4(2) commercial paper and
               municipal lease obligations. Accordingly, such securities may not
               be subject to the foregoing limitation.
 
               (g) The Fund may not invest in companies for the purpose of
               exercising control of management.
 
               Under the terms of an exemptive order received from the
               Securities and Exchange Commission ("SEC") the Fund may borrow
               money from or lend money to other funds that permit such
               transactions and for which Janus Capital serves as investment
               adviser. All such borrowing and lending will be subject to the
               above limits. The Fund will borrow money through the program only
               when the costs are equal to or lower than the cost of bank loans.
               Interfund loans and borrowings normally extend overnight, but can
               have maximum duration of seven days. The Fund will lend through
               the program only when the returns are higher than those available
               from other short-term instruments (such as repurchase
               agreements). The Fund may have to borrow from a bank at a higher
               interest rate if an interfund loan is called or not renewed. Any
               delay in repayment to a lending Fund could result in a lost
               investment opportunity or additional borrowing costs.
 
                                                                               5
<PAGE> 
 
               For the purposes of the Fund's policies on investing in
               particular industries, the Fund will rely primarily on industry
               or industry group classifications published by Bloomberg L.P. To
               the extent that Bloomberg L.P. industry classifications are so
               broad that the primary economic characteristics in a single
               industry are materially different, the Fund may further classify
               issuers in accordance with industry classifications as published
               by the SEC.
 
INVESTMENT STRATEGIES AND RISKS
 
Cash Position
 
   
               As discussed in the Prospectus, when the Fund's portfolio
               managers believe that market conditions are unfavorable for
               profitable investing, or when they are otherwise unable to locate
               attractive investment opportunities, the Fund's investment in
               cash and similar investments may increase. Securities that the
               Fund may invest in as a means of receiving a return on idle cash
               include commercial paper, certificates of deposit, repurchase
               agreements or other short-term debt obligations. The Fund may
               also invest in money market funds, including funds managed by
               Janus Capital. (See "Investment Company Securities" on page 12).
    
 
Illiquid Investments
 
               The Fund may invest up to 15% of its net assets in illiquid
               investments (i.e., securities that are not readily marketable).
               The Trustees have authorized Janus Capital to make liquidity
               determinations with respect to certain securities, including Rule
               144A Securities, commercial paper and municipal lease obligations
               purchased by the Fund. Under the guidelines established by the
               Trustees, Janus Capital will consider the following factors: 1)
               the frequency of trades and quoted prices for the obligation; 2)
               the number of dealers willing to purchase or sell the security
               and the number of other potential purchasers; 3) the willingness
               of dealers to undertake to make a market in the security; and 4)
               the nature of the security and the nature of marketplace trades,
               including the time needed to dispose of the security, the method
               of soliciting offers and the mechanics of the
 
 6
<PAGE> 
 
               transfer. In the case of commercial paper, Janus Capital will
               also consider whether the paper is traded flat or in default as
               to principal and interest and any ratings of the paper by a
               Nationally Recognized Statistical Rating Organization ("NRSRO").
               A foreign security that may be freely traded on or through the
               facilities of an offshore exchange or other established offshore
               securities market is not deemed to be a restricted security
               subject to these procedures.
 
               If illiquid securities exceed 15% of the Fund's net assets after
               the time of purchase the Fund will take steps to reduce in an
               orderly fashion its holdings of illiquid securities. Because
               illiquid securities may not be readily marketable, the portfolio
               managers may not be able to dispose of them in a timely manner.
               As a result, the Fund may be forced to hold illiquid securities
               while their price depreciates. Depreciation in the price of
               illiquid securities may cause the net asset value of the Fund to
               decline.
 
Foreign Securities
 
               The Fund 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 Fund's performance may depend on
               issues other than the performance of a particular company. These
               issues include:
 
               - CURRENCY RISK. As long as the Fund holds a foreign security,
                 its value will be affected by the value of the local currency
                 relative to the U.S. dollar. When the Fund 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
 
                                                                               7
<PAGE> 
 
                 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 Fund's assets
                 from that country.
 
               - 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.
 
Short Sales
 
               The Fund may engage in "short sales against the box." This
               technique involves selling either a security that the Fund owns,
               or a security equivalent in kind and amount to the security sold
               short that the Fund has the right to obtain, for delivery at a
               specified date in the future. The Fund may enter into a short
               sale against the box to hedge against anticipated declines in the
               market price of portfolio securities. If the value of the
               securities sold short increases prior to the scheduled delivery
               date, the Fund loses the opportunity to participate in the gain.
 
 8
<PAGE> 
 
Zero Coupon, Step Coupon and Pay-In-Kind Securities
 
               The Fund may invest up to 10% of its assets in zero coupon, pay-
               in-kind and step coupon securities. Zero coupon bonds are issued
               and traded at a discount from their face value. They do not
               entitle the holder to any periodic payment of interest prior to
               maturity. Step coupon bonds trade at a discount from their face
               value and pay coupon interest. The coupon rate is low for an
               initial period and then increases to a higher coupon rate
               thereafter. The discount from the face amount or par 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. Pay-in-kind bonds
               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.
 
               Current federal income tax law requires holders of zero coupon
               and step coupon securities to report the portion of the original
               issue discount on such securities that accrues during a given
               year as interest income, even though the holders receive no cash
               payments of interest during the year. In order to qualify as a
               "regulated investment company" under the Internal Revenue Code of
               1986 and the regulations thereunder (the "Code"), the Fund must
               distribute its investment company taxable income, including the
               original issue discount accrued on zero coupon or step coupon
               bonds. Because the Fund will not receive cash payments on a
               current basis in respect of accrued original issue discount on
               zero coupon bonds or step coupon bonds during the period before
               interest payments begin, in some years the Fund may have to
               distribute cash obtained from other sources in order to satisfy
               the distribution requirements under the Code. The Fund might
               obtain such cash from selling other portfolio holdings which
               might cause the Fund to incur capital gains or losses on the
               sale. Additionally, these actions are likely to reduce the assets
               to which Fund expenses could be allocated and to reduce the rate
               of return for the Fund. In some circumstances, such sales might
               be
 
                                                                               9
<PAGE> 
 
               necessary in order to satisfy cash distribution requirements even
               though investment considerations might otherwise make it
               undesirable for the Fund to sell the securities at the time.
 
               Generally, the market prices of zero coupon, step coupon and
               pay-in-kind securities are more volatile than the prices of
               securities that pay interest periodically and in cash and are
               likely to respond to changes in interest rates to a greater
               degree than other types of debt securities having similar
               maturities and credit quality.
 
Pass-Through Securities
 
               The Fund may invest in various types of pass-through securities,
               such as mortgage-backed securities, asset-backed securities and
               participation interests. A pass-through security is a share or
               certificate of interest in a pool of debt obligations that have
               been repackaged by an intermediary, such as a bank or
               broker-dealer. The purchaser of a pass-through security receives
               an undivided interest in the underlying pool of securities. The
               issuers of the underlying securities make interest and principal
               payments to the intermediary which are passed through to
               purchasers, such as the Fund. The most common type of
               pass-through securities are mortgage-backed securities.
               Government National Mortgage Association ("GNMA") Certificates
               are mortgage-backed securities that evidence an undivided
               interest in a pool of mortgage loans. GNMA Certificates differ
               from bonds in that principal is paid back monthly by the
               borrowers over the term of the loan rather than returned in a
               lump sum at maturity. The Fund will generally purchase "modified
               pass-through" GNMA Certificates, which entitle the holder to
               receive a share of all interest and principal payments paid and
               owned on the mortgage pool, net of fees paid to the "issuer" and
               GNMA, regardless of whether or not the mortgagor actually makes
               the payment. GNMA Certificates are backed as to the timely
               payment of principal and interest by the full faith and credit of
               the U.S. government.
 
               The Federal Home Loan Mortgage Corporation ("FHLMC") issues two
               types of mortgage pass-through securities: mortgage participation
               certificates ("PCs") and guaranteed mortgage
 
 10
<PAGE> 
 
               certificates ("GMCs"). PCs resemble GNMA Certificates in that
               each PC represents a pro rata share of all interest and principal
               payments made and owned on the underlying pool. FHLMC guarantees
               timely payments of interest on PCs and the full return of
               principal. GMCs also represent a pro rata interest in a pool of
               mortgages. However, these instruments pay interest semiannually
               and return principal once a year in guaranteed minimum payments.
               This type of security is guaranteed by FHLMC as to timely payment
               of principal and interest but it is not guaranteed by the full
               faith and credit of the U.S. government.
 
               The Federal National Mortgage Association ("FNMA") issues
               guaranteed mortgage pass-through certificates ("FNMA
               Certificates"). FNMA Certificates resemble GNMA Certificates in
               that each FNMA Certificate represents a pro rata share of all
               interest and principal payments made and owned on the underlying
               pool. This type of security is guaranteed by FNMA as to timely
               payment of principal and interest but it is not guaranteed by the
               full faith and credit of the U.S. government.
 
               Except for GMCs, each of the mortgage-backed securities described
               above is characterized by monthly payments to the holder,
               reflecting the monthly payments made by the borrowers who
               received the underlying mortgage loans. The payments to the
               security holders (such as the Fund), like the payments on the
               underlying loans, represent both principal and interest. Although
               the underlying mortgage loans are for specified periods of time,
               such as 20 or 30 years, the borrowers can, and typically do, pay
               them off sooner. Thus, the security holders frequently receive
               prepayments of principal in addition to the principal that is
               part of the regular monthly payments. The Fund's portfolio
               managers will consider estimated prepayment rates in calculating
               the average weighted maturity of the Fund. A borrower is more
               likely to prepay a mortgage that bears a relatively high rate of
               interest. This means that in times of declining interest rates,
               higher yielding mortgage-backed securities held by the Fund might
               be converted to cash and the Fund will be forced to accept lower
               interest rates when that cash is used to purchase additional
               securities in the
 
                                                                              11
<PAGE> 
 
               mortgage-backed securities sector or in other investment sectors.
               Additionally, prepayments during such periods will limit the
               Fund's ability to participate in as large a market gain as may be
               experienced with a comparable security not subject to prepayment.
 
               Asset-backed securities represent interests in pools of consumer
               loans and are backed by paper or accounts receivables originated
               by banks, credit card companies or other providers of credit.
               Generally, the originating bank or credit provider is neither the
               obligor nor the guarantor of the security, and interest and
               principal payments ultimately depend upon payment of the
               underlying loans by individuals. Tax-exempt asset-backed
               securities include units of beneficial interests in pools of
               purchase contracts, financing leases, and sales agreements that
               may be created when a municipality enters into an installment
               purchase contract or lease with a vendor. Such securities may be
               secured by the assets purchased or leased by the municipality;
               however, if the municipality stops making payments, there
               generally will be no recourse against the vendor. These
               obligations are likely to involve unscheduled prepayments of
               principal.
 
Investment Company Securities
 
               From time to time, the Fund may invest in securities of other
               investment companies, subject to the provisions of Section
               12(d)(1) of the 1940 Act. The Fund may invest in securities of
               money market funds managed by Janus Capital in excess of the
               limitations of Section 12(d)(1) under the terms of an SEC
               exemptive order obtained by Janus Capital and the Janus funds.
 
Depositary Receipts
 
               The Fund may invest in sponsored and unsponsored American
               Depositary Receipts ("ADRs"), which are receipts issued by an
               American bank or trust company evidencing ownership of underlying
               securities issued by a foreign issuer. ADRs, in registered form,
               are designed for use in U.S. securities markets. Unsponsored ADRs
               may be created without the participation of
 
 12
<PAGE> 
 
               the foreign issuer. Holders of these ADRs generally bear all the
               costs of the ADR facility, whereas foreign issuers typically bear
               certain costs in a sponsored ADR. The bank or trust company
               depositary of an unsponsored ADR may be under no obligation to
               distribute shareholder communications received from the foreign
               issuer or to pass through voting rights. The Fund may also invest
               in European Depositary Receipts ("EDRs"), Global Depositary
               Receipts ("GDRs") and in other similar instruments representing
               securities of foreign companies. EDRs are receipts issued by a
               European financial institution evidencing an arrangement similar
               to that of ADRs. EDRs, in bearer form, are designed for use in
               European securities markets.
 
               Depositary Receipts are generally subject to the same sort of
               risks as direct investments in a foreign country, such as,
               currency risk, political and economic risk, and market risk,
               because their values depend on the performance of a foreign
               security denominated in its home currency. The risks of foreign
               investing are addressed in some detail in the Fund's prospectus.
 
Municipal Obligations
 
               The Fund may invest in municipal obligations issued by states,
               territories and possessions of the United States and the District
               of Columbia. The value of municipal obligations can be affected
               by changes in their actual or perceived credit quality. The
               credit quality of municipal obligations can be affected by, among
               other things the financial condition of the issuer or guarantor,
               the issuer's future borrowing plans and sources of revenue, the
               economic feasibility of the revenue bond project or general
               borrowing purpose, political or economic developments in the
               region where the security is issued, and the liquidity of the
               security. Because municipal securities are generally traded over-
               the-counter, the liquidity of a particular issue often depends on
               the willingness of dealers to make a market in the security. The
               liquidity of some municipal obligations may be enhanced by demand
               features, which would enable the Fund to demand
 
                                                                              13
<PAGE> 
 
               payment on short notice from the issuer or a financial
               intermediary.
 
Other Income-Producing Securities
 
               Other types of income producing securities that the Fund may
               purchase include, but are not limited to, the following types of
               securities:
 
               VARIABLE AND FLOATING RATE OBLIGATIONS. These types of 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. These types of securities have variable or
               floating rates of interest and, under certain limited
               circumstances, may have varying principal amounts. Variable and
               floating rate 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 "underlying index"). See also "Inverse Floaters."
 
               In order to most effectively use these investments, the portfolio
               managers must correctly assess probable movements in interest
               rates. This involves different skills than those used to select
               most portfolio securities. If the portfolio managers incorrectly
               forecast such movements, the Fund could be adversely affected by
               the use of variable or floating rate obligations.
 
               STANDBY COMMITMENTS. These instruments, which are similar to a
               put, give the Fund the option to obligate a broker, dealer or
               bank to repurchase a security held by the Fund at a specified
               price.
 
               TENDER OPTION BONDS. Tender option bonds are generally long-term
               securities that are coupled with the 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.
 
 14
<PAGE> 
 
               INVERSE FLOATERS. Inverse floaters are debt instruments whose
               interest bears an inverse relationship to the interest rate on
               another security. The Fund will not invest more than 5% of its
               assets in inverse floaters. Similar to variable and floating rate
               obligations, effective use of inverse floaters requires skills
               different from those needed to select most portfolio securities.
               If movements in interest rates are incorrectly anticipated, the
               Fund could lose money or its NAV could decline by the use of
               inverse floaters.
 
               STRIP BONDS. 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.
 
               The Fund will purchase standby commitments, tender option bonds
               and instruments with demand features primarily for the purpose of
               increasing the liquidity of its portfolio.
 
High-Yield/High-Risk Securities
 
               The Fund intends to invest less than 35% of its net assets in
               securities that are rated below investment grade (e.g.,
               securities rated BB or lower by Standard & Poor's Ratings
               Services or Ba or lower by Moody's Investors Service, Inc.).
               Lower rated securities involve a higher degree of credit risk,
               which is the risk that the issuer will not make interest or
               principal payments when due. In the event of an unanticipated
               default, the Fund would experience a reduction in its income, and
               could expect a decline in the market value of the securities so
               affected.
 
               The Fund may also invest in unrated debt securities of foreign
               and domestic issuers. Unrated debt, while not necessarily of
               lower quality than rated securities, may not have as broad a
               market. Sovereign debt of foreign governments is generally rated
               by country. Because these ratings do not take into account
               individual factors relevant to each issue and may not be updated
               regularly, Janus Capital may treat such securities as unrated
               debt. Because of
 
                                                                              15
<PAGE> 
 
               the size and perceived demand of the issue, among other factors,
               certain municipalities may not incur the costs of obtaining a
               rating. The Fund's portfolio managers will analyze the
               creditworthiness of the issuer, as well as any financial
               institution or other party responsible for payments on the
               security, in determining whether to purchase unrated municipal
               bonds. Unrated debt securities will be included in the 35% limit
               unless the portfolio managers deem such securities to be the
               equivalent of investment grade securities.
 
               Subject to the above limits, the Fund may purchase defaulted
               securities only when its portfolio managers believe, based upon
               their analysis of the financial condition, results of operations
               and economic outlook of an issuer, that there is potential for
               resumption of income payments and that the securities offer an
               unusual opportunity for capital appreciation. Notwithstanding the
               portfolio managers' belief about the resumption of income,
               however, the purchase of any security on which payment of
               interest or dividends is suspended involves a high degree of
               risk. Such risk includes, among other things, the following:
 
               Financial and Market Risks. Investments in securities that are in
               default involve a high degree of financial and market risks that
               can result in substantial or, at times, even total losses.
               Issuers of defaulted securities may have substantial capital
               needs and may become involved in bankruptcy or reorganization
               proceedings. Among the problems involved in investments in such
               issuers is the fact that it may be difficult to obtain
               information about the condition of such issuers. The market
               prices of such securities also are subject to abrupt and erratic
               movements and above average price volatility, and the spread
               between the bid and asked prices of such securities may be
               greater than normally expected.
 
               Disposition of Portfolio Securities. Although the Fund generally
               will purchase securities for which its portfolio managers expect
               an active market to be maintained, defaulted securities may be
               less actively traded than other securities and it may be
               difficult to dispose of substantial holdings of such securities
               at prevailing market prices. The Fund will limit holdings of any
               such securities
 
 16
<PAGE> 
 
               to amounts that the portfolio managers believe could be readily
               sold, and holdings of such securities would, in any event, be
               limited so as not to limit the Fund's ability to readily dispose
               of securities to meet redemptions.
 
               Other. Defaulted securities require active monitoring and may, at
               times, require participation in bankruptcy or receivership
               proceedings on behalf of the Fund.
 
Repurchase and Reverse Repurchase Agreements
 
               In a repurchase agreement, the Fund purchases a security and
               simultaneously commits to resell that security to the seller at
               an agreed upon price on an agreed upon date within a number of
               days (usually not more than seven) from the date of purchase. The
               resale price consists of the purchase price plus an agreed upon
               incremental amount that is unrelated to the coupon rate or
               maturity of the purchased security. A repurchase agreement
               involves the obligation of the seller to pay the agreed upon
               price, which obligation is in effect secured by the value (at
               least equal to the amount of the agreed upon resale price and
               marked-to-market daily) of the underlying security or
               "collateral." A risk associated with repurchase agreements is the
               failure of the seller to repurchase the securities as agreed,
               which may cause the Fund to suffer a loss if the market value of
               such securities declines before they can be liquidated on the
               open market. In the event of bankruptcy or insolvency of the
               seller, the Fund may encounter delays and incur costs in
               liquidating the underlying security. Repurchase agreements that
               mature in more than seven days are subject to the 15% limit on
               illiquid investments. While it is possible to eliminate all risks
               from these transactions, it is the policy of the Fund to limit
               repurchase agreements to those parties whose creditworthiness has
               been reviewed and found satisfactory by Janus Capital.
 
               The Fund may use reverse repurchase agreements to obtain cash to
               satisfy unusually heavy redemption requests or for other
               temporary or emergency purposes without the necessity of selling
               portfolio securities or to earn additional income on portfolio
 
                                                                              17
<PAGE> 
 
               securities, such as Treasury bills or notes. In a reverse
               repurchase agreement, the Fund sells a portfolio security to
               another party, such as a bank or broker-dealer, in return for
               cash and agrees to repurchase the instrument at a particular
               price and time. While a reverse repurchase agreement is
               outstanding, the Fund will maintain cash and appropriate liquid
               assets in a segregated custodial account to cover its obligation
               under the agreement. The Fund will enter into reverse repurchase
               agreements only with parties that Janus Capital deems
               creditworthy. Using reverse repurchase agreements to earn
               additional income involves the risk that the interest earned on
               the invested proceeds is less than the expense of the reverse
               repurchase agreement transaction. This technique may also have a
               leveraging effect on the Fund's portfolio, although the Fund's
               intent to segregate assets in the amount of the reverse
               repurchase agreement minimizes this effect.
 
Futures, Options and Other Derivative Instruments
 
               FUTURES CONTRACTS. The Fund may enter into contracts for the
               purchase or sale for future delivery of fixed-income securities,
               foreign currencies or contracts based on financial indices,
               including indices of U.S. government securities, foreign
               government securities, equity or fixed-income securities. U.S.
               futures contracts are traded on exchanges which have been
               designated "contract markets" by the CFTC and must be executed
               through a futures commission merchant ("FCM"), or brokerage firm,
               which is a member of the relevant contract market. Through their
               clearing corporations, the exchanges guarantee performance of the
               contracts as between the clearing members of the exchange.
 
               The buyer or seller of a futures contract is not required to
               deliver or pay for the underlying instrument unless the contract
               is held until the delivery date. However, both the buyer and
               seller are required to deposit "initial margin" for the benefit
               of the FCM when the contract is entered into. Initial margin
               deposits are equal to a percentage of the contract's value, as
               set by the exchange on which the contract is traded, and may be
               maintained in cash or certain other liquid assets by the Fund's
               custodian for the benefit of the FCM. Initial margin payments are
               similar to good faith
 
 18
<PAGE> 
 
               deposits or performance bonds. Unlike margin extended by a
               securities broker, initial margin payments do not constitute
               purchasing securities on margin for purposes of the Fund's
               investment limitations. If the value of either party's position
               declines, that party will be required to make additional
               "variation margin" payments for the benefit of the FCM to settle
               the change in value on a daily basis. The party that has a gain
               may be entitled to receive all or a portion of this amount. In
               the event of the bankruptcy of the FCM that holds margin on
               behalf of the Fund, the Fund may be entitled to a return of
               margin owed to the Fund only in proportion to the amount received
               by the FCM's other customers. Janus Capital will attempt to
               minimize the risk by careful monitoring of the creditworthiness
               of the FCMs with which the Fund does business and by depositing
               margin payments in a segregated account with the Fund's
               custodian.
 
               The Fund intends to comply with guidelines of eligibility for
               exclusion from the definition of the term "commodity pool
               operator" adopted by the CFTC and the National Futures
               Association, which regulate trading in the futures markets. The
               Fund will use futures contracts and related options primarily for
               bona fide hedging purposes within the meaning of CFTC
               regulations. To the extent that the Fund holds positions in
               futures contracts and related options that do not fall within the
               definition of bona fide hedging transactions, the aggregate
               initial margin and premiums required to establish such positions
               will not exceed 5% of the fair market value of the Fund's net
               assets, after taking into account unrealized profits and
               unrealized losses on any such contracts it has entered into.
 
               Although the Fund will segregate cash and liquid assets in an
               amount sufficient to cover its open futures obligations, the
               segregated assets would be available to the Fund immediately upon
               closing out the futures position, while settlement of securities
               transactions could take several days. However, because the Fund's
               cash that may otherwise be invested would be held uninvested or
               invested in other liquid assets so long as the futures
 
                                                                              19
<PAGE> 
 
               position remains open, the Fund's return could be diminished due
               to the opportunity losses of foregoing other potential
               investments.
 
               The Fund's primary purpose in entering into futures contracts is
               to protect the Fund from fluctuations in the value of securities
               or interest rates without actually buying or selling the
               underlying debt or equity security. For example, if the Fund
               anticipates an increase in the price of stocks, and it intends to
               purchase stocks at a later time, the Fund could enter into a
               futures contract to purchase a stock index as a temporary
               substitute for stock purchases. If an increase in the market
               occurs that influences the stock index as anticipated, the value
               of the futures contracts will increase, thereby serving as a
               hedge against the Fund not participating in a market advance.
               This technique is sometimes known as an anticipatory hedge. To
               the extent the Fund enters into futures contracts for this
               purpose, the segregated assets maintained to cover the Fund's
               obligations with respect to the futures contracts will consist of
               other liquid assets from its portfolio in an amount equal to the
               difference between the contract price and the aggregate value of
               the initial and variation margin payments made by the Fund with
               respect to the futures contracts. Conversely, if the Fund holds
               stocks and seeks to protect itself from a decrease in stock
               prices, the Fund might sell stock index futures contracts,
               thereby hoping to offset the potential decline in the value of
               its portfolio securities by a corresponding increase in the value
               of the futures contract position. The Fund could protect against
               a decline in stock prices by selling portfolio securities and
               investing in money market instruments, but the use of futures
               contracts enables it to maintain a defensive position without
               having to sell portfolio securities.
 
               If the Fund owns Treasury bonds and the portfolio managers expect
               interest rates to increase, the Fund may take a short position in
               interest rate futures contracts. Taking such a position would
               have much the same effect as the Fund selling Treasury bonds in
               its portfolio. If interest rates increase as anticipated, the
               value of the Treasury bonds would decline, but the value of the
               Fund's interest rate futures contract will increase, thereby
               keeping the net asset value of the Fund from declining as much as
               it may
 
 20
<PAGE> 
 
               have otherwise. If, on the other hand, the portfolio managers
               expect interest rates to decline, the Fund may take a long
               position in interest rate futures contracts in anticipation of
               later closing out the futures position and purchasing bonds.
               Although the Fund can accomplish similar results by buying
               securities with long maturities and selling securities with short
               maturities, given the greater liquidity of the futures market
               than the cash market, it may be possible to accomplish the same
               result more easily and more quickly by using futures contracts as
               an investment tool to reduce risk.
 
               The ordinary spreads between prices in the cash and futures
               markets, due to differences in the nature of those markets, are
               subject to distortions. First, all participants in the futures
               market are subject to initial margin and variation margin
               requirements. Rather than meeting additional variation margin
               requirements, investors may close out futures contracts through
               offsetting transactions which could distort the normal price
               relationship between the cash and futures markets. Second, the
               liquidity of the futures market depends on participants entering
               into offsetting transactions rather than making or taking
               delivery of the instrument underlying a futures contract. To the
               extent participants decide to make or take delivery, liquidity in
               the futures market could be reduced and prices in the futures
               market distorted. Third, from the point of view of speculators,
               the margin deposit requirements in the futures market are less
               onerous than margin requirements in the securities market.
               Therefore, increased participation by speculators in the futures
               market may cause temporary price distortions. Due to the
               possibility of the foregoing distortions, a correct forecast of
               general price trends by the portfolio managers still may not
               result in a successful use of futures.
 
               Futures contracts entail risks. Although the Fund believes that
               use of such contracts will benefit the Fund, the Fund's overall
               performance could be worse than if the Fund had not entered into
               futures contracts if the portfolio managers' investment judgement
               proves incorrect. For example, if the Fund has hedged
 
                                                                              21
<PAGE> 
 
               against the effects of a possible decrease in prices of
               securities held in its portfolio and prices increase instead, the
               Fund will lose part or all of the benefit of the increased value
               of these securities because of offsetting losses in its futures
               positions. In addition, if the Fund has insufficient cash, it may
               have to sell securities from its portfolio to meet daily
               variation margin requirements. Those sales may be, but will not
               necessarily be, at increased prices which reflect the rising
               market and may occur at a time when the sales are disadvantageous
               to the Fund.
 
               The prices of futures contracts depend primarily on the value of
               their underlying instruments. Because there are a limited number
               of types of futures contracts, it is possible that the
               standardized futures contracts available to the Fund will not
               match exactly the Fund's current or potential investments. The
               Fund may buy and sell futures contracts based on underlying
               instruments with different characteristics from the securities in
               which it typically invests D for example, by hedging investments
               in portfolio securities with a futures contract based on a broad
               index of securities D which involves a risk that the futures
               position will not correlate precisely with the performance of the
               Fund's investments.
 
               Futures prices can also diverge from the prices of their
               underlying instruments, even if the underlying instruments
               closely correlate with the Fund's investments. Futures prices are
               affected by factors such as current and anticipated short-term
               interest rates, changes in volatility of the underlying
               instruments and the time remaining until expiration of the
               contract. Those factors may affect securities prices differently
               from futures prices. Imperfect correlations between the Fund's
               investments and its futures positions also may result from
               differing levels of demand in the futures markets and the
               securities markets, from structural differences in how futures
               and securities are traded, and from imposition of daily price
               fluctuation limits for futures contracts. The Fund may buy or
               sell futures contracts with a greater or lesser value than the
               securities it wishes to hedge or is considering purchasing in
               order to attempt to compensate for differences in historical
               volatility between the futures contract and the securities,
               although this may
 
 22
<PAGE> 
 
               not be successful in all cases. If price changes in the Fund's
               futures positions are poorly correlated with its other
               investments, its futures positions may fail to produce desired
               gains or result in losses that are not offset by the gains in the
               Fund's other investments.
 
               Because futures contracts are generally settled within a day from
               the date they are closed out, compared with a settlement period
               of three days for some types of securities, the futures markets
               can provide superior liquidity to the securities markets.
               Nevertheless, there is no assurance that a liquid secondary
               market will exist for any particular futures contract at any
               particular time. In addition, futures exchanges may establish
               daily price fluctuation limits for futures contracts and may halt
               trading if a contract's price moves upward or downward more than
               the limit in a given day. On volatile trading days when the price
               fluctuation limit is reached, it may be impossible for the Fund
               to enter into new positions or close out existing positions. If
               the secondary market for a futures contract is not liquid because
               of price fluctuation limits or otherwise, the Fund may not be
               able to promptly liquidate unfavorable futures positions and
               potentially could be required to continue to hold a futures
               position until the delivery date, regardless of changes in its
               value. As a result, the Fund's access to other assets held to
               cover its futures positions also could be impaired.
 
               OPTIONS ON FUTURES CONTRACTS. The Fund may buy and write put and
               call options on futures contracts. An option on a future gives
               the Fund the right (but not the obligation) to buy or sell a
               futures contract at a specified price on or before a specified
               date. The purchase of a call option on a futures contract is
               similar in some respects to the purchase of a call option on an
               individual security. Depending on the pricing of the option
               compared to either the price of the futures contract upon which
               it is based or the price of the underlying instrument, ownership
               of the option may or may not be less risky than ownership of the
               futures contract or the underlying instrument. As with the
               purchase of futures contracts,
 
                                                                              23
<PAGE> 
 
               when the Fund is not fully invested it may buy a call option on a
               futures contract to hedge against a market advance.
 
               The writing of a call option on a futures contract constitutes a
               partial hedge against declining prices of the security or foreign
               currency which is deliverable under, or of the index comprising,
               the futures contract. If the future's price at the expiration of
               the option is below the exercise price, the Fund will retain the
               full amount of the option premium which provides a partial hedge
               against any decline that may have occurred in the Fund's
               portfolio holdings. The writing of a put option on a futures
               contract constitutes a partial hedge against increasing prices of
               the security or foreign currency which is deliverable under, or
               of the index comprising, the futures contract. If the futures'
               price at expiration of the option is higher than the exercise
               price, the Fund will retain the full amount of the option premium
               which provides a partial hedge against any increase in the price
               of securities which the Fund is considering buying. If a call or
               put option the Fund has written is exercised, the Fund will incur
               a loss which will be reduced by the amount of the premium it
               received. Depending on the degree of correlation between the
               change in the value of its portfolio securities and changes in
               the value of the futures positions, the Fund's losses from
               existing options on futures may to some extent be reduced or
               increased by changes in the value of portfolio securities.
 
               The purchase of a put option on a futures contract is similar in
               some respects to the purchase of protective put options on
               portfolio securities. For example, the Fund may buy a put option
               on a futures contract to hedge its portfolio against the risk of
               falling prices or rising interest rates.
 
               The amount of risk the Fund assumes when it buys an option on a
               futures contract is the premium paid for the option plus related
               transaction costs. In addition to the correlation risks discussed
               above, the purchase of an option also entails the risk that
               changes in the value of the underlying futures contract will not
               be fully reflected in the value of the options bought.
 
 24
<PAGE> 
 
               FORWARD CONTRACTS. A forward contract is an agreement between two
               parties in which one party is obligated to deliver a stated
               amount of a stated asset at a specified time in the future and
               the other party is obligated to pay a specified amount for the
               assets at the time of delivery. The Fund may enter into forward
               contracts to purchase and sell government securities, equity or
               income securities, foreign currencies or other financial
               instruments. Forward contracts generally are traded in an
               interbank market conducted directly between traders (usually
               large commercial banks) and their customers. Unlike futures
               contracts, which are standardized contracts, forward contracts
               can be specifically drawn to meet the needs of the parties that
               enter into them. The parties to a forward contract may agree to
               offset or terminate the contract before its maturity, or may hold
               the contract to maturity and complete the contemplated exchange.
 
               The following discussion summarizes the Fund's principal uses of
               forward foreign currency exchange contracts ("forward currency
               contracts"). The Fund may enter into forward currency contracts
               with stated contract values of up to the value of the Fund's
               assets. A forward currency contract is an obligation to buy or
               sell an amount of a specified currency for an agreed price (which
               may be in U.S. dollars or a foreign currency). The Fund will
               exchange foreign currencies for U.S. dollars and for other
               foreign currencies in the normal course of business and may buy
               and sell currencies through forward currency contracts in order
               to fix a price for securities it has agreed to buy or sell
               ("transaction hedge"). The Fund also may hedge some or all of its
               investments denominated in a foreign currency or exposed to
               foreign currency fluctuations against a decline in the value of
               that currency relative to the U.S. dollar by entering into
               forward currency contracts to sell an amount of that currency (or
               a proxy currency whose performance is expected to replicate or
               exceed the performance of that currency relative to the U.S.
               dollar) approximating the value of some or all of its portfolio
               securities denominated in that currency ("position hedge") or by
               participating in options or futures contracts with respect to the
               currency. The Fund also may enter
 
                                                                              25
<PAGE> 
 
               into a forward currency contract with respect to a currency where
               the Fund is considering the purchase or sale of investments
               denominated in that currency but has not yet selected the
               specific investments ("anticipatory hedge"). In any of these
               circumstances the Fund may, alternatively, enter into a forward
               currency contract to purchase or sell one foreign currency for a
               second currency that is expected to perform more favorably
               relative to the U.S. dollar if the portfolio managers believe
               there is a reasonable degree of correlation between movements in
               the two currencies ("cross-hedge").
 
               These types of hedging minimize the effect of currency
               appreciation as well as depreciation, but do not eliminate
               fluctuations in the underlying U.S. dollar equivalent value of
               the proceeds of or rates of return on the Fund's foreign currency
               denominated portfolio securities. The matching of the increase in
               value of a forward contract and the decline in the U.S. dollar
               equivalent value of the foreign currency denominated asset that
               is the subject of the hedge generally will not be precise.
               Shifting the Fund's currency exposure from one foreign currency
               to another removes the Fund's opportunity to profit from
               increases in the value of the original currency and involves a
               risk of increased losses to the Fund if its portfolio managers'
               projection of future exchange rates is inaccurate. Proxy hedges
               and cross-hedges may result in losses if the currency used to
               hedge does not perform similarly to the currency in which hedged
               securities are denominated. Unforeseen changes in currency prices
               may result in poorer overall performance for the Fund than if it
               had not entered into such contracts.
 
               The Fund will cover outstanding forward currency contracts by
               maintaining liquid portfolio securities denominated in or whose
               value its tied to, the currency underlying the forward contract
               or the currency being hedged. To the extent that the Fund is not
               able to cover its forward currency positions with underlying
               portfolio securities, the Fund's custodian will segregate cash or
               other liquid assets having a value equal to the aggregate amount
               of the Fund's commitments under forward contracts entered into
               with respect to position hedges, cross-hedges and anticipatory
 
 26
<PAGE> 
 
               hedges. If the value of the securities used to cover a position
               or the value of segregated assets declines, the Fund will find
               alternative cover or segregate additional cash or liquid assets
               on a daily basis so that the value of the covered and segregated
               assets will be equal to the amount of the Fund's commitments with
               respect to such contracts. As an alternative to segregating
               assets, the Fund may buy call options permitting the Fund to buy
               the amount of foreign currency being hedged by a forward sale
               contract or the Fund may buy put options permitting it to sell
               the amount of foreign currency subject to a forward buy contract.
 
               While forward contracts are not currently regulated by the CFTC,
               the CFTC may in the future assert authority to regulate forward
               contacts. In such event, the Fund's ability to utilize forward
               contracts may be restricted. In addition, the Fund may not always
               be able to enter into forward contracts at attractive prices and
               may be limited in its ability to use these contracts to hedge
               Fund assets.
 
               OPTIONS ON FOREIGN CURRENCIES. The Fund may buy and write options
               on foreign currencies in a manner similar to that in which
               futures or forward contracts on foreign currencies will be
               utilized. For example, a decline in the U.S. dollar value of a
               foreign currency in which portfolio securities are denominated
               will reduce the U.S. dollar value of such securities, even if
               their value in the foreign currency remains constant. In order to
               protect against such diminutions in the value of portfolio
               securities, the Fund may buy put options on the foreign currency.
               If the value of the currency declines, the Fund will have the
               right to sell such currency for a fixed amount in U.S. dollars,
               thereby offsetting, in whole or in part, the adverse effect on
               its portfolio.
 
               Conversely, when a rise in the U.S. dollar value of a currency in
               which securities to be acquired are denominated is projected,
               thereby increasing the cost of such securities, the Fund may buy
               call options on the foreign currency. The purchase of such
               options could offset, at least partially, the effects of the
               adverse movements in exchange rates. As in the case of other
               types of options,
 
                                                                              27
<PAGE> 
 
               however, the benefit to the Fund from purchases of foreign
               currency options will be reduced by the amount of the premium and
               related transaction costs. In addition, if currency exchange
               rates do not move in the direction or to the extent projected,
               the Fund could sustain losses on transactions in foreign currency
               options that would require the Fund to forego a portion or all of
               the benefits of advantageous changes in those rates.
 
               The Fund may also write options on foreign currencies. For
               example, to hedge against a potential decline in the U.S. dollar
               value of foreign currency denominated securities due to adverse
               fluctuations in exchange rates, the Fund could, instead of
               purchasing a put option, write a call option on the relevant
               currency. If the expected decline occurs, the option will most
               likely not be exercised and the decline in value of portfolio
               securities will be offset by the amount of the premium received.
 
               Similarly, instead of purchasing a call option to hedge against a
               potential increase in the U.S. dollar cost of securities to be
               acquired, the Fund could write a put option on the relevant
               currency which, if rates move in the manner projected, should
               expire unexercised and allow the Fund to hedge the increased cost
               up to the amount of the premium. As in the case of other types of
               options, however, the writing of a foreign currency option will
               constitute only a partial hedge up to the amount of the premium.
               If exchange rates do not move in the expected direction, the
               option may be exercised and the Fund would be required to buy or
               sell the underlying currency at a loss which may not be offset by
               the amount of the premium. Through the writing of options on
               foreign currencies, the Fund also may lose all or a portion of
               the benefits which might otherwise have been obtained from
               favorable movements in exchange rates.
 
               The Fund may write covered call options on foreign currencies. A
               call option written on a foreign currency by the Fund is
               "covered" if the Fund owns the foreign currency underlying the
               call or has an absolute and immediate right to acquire that
               foreign currency without additional cash consideration (or for
               additional cash consideration held in a segregated account by its
               custodian) upon
 
 28
<PAGE> 
 
               conversion or exchange of other foreign currencies held in its
               portfolio. A call option is also covered if the Fund has a call
               on the same foreign currency in the same principal amount as the
               call written if the exercise price of the call held (i) is equal
               to or less than the exercise price of the call written or (ii) is
               greater than the exercise price of the call written, if the
               difference is maintained by the Fund in cash or other liquid
               assets in a segregated account with the Fund's custodian.
 
               The Fund also may write call options on foreign currencies for
               cross-hedging purposes. A call option on a foreign currency is
               for cross-hedging purposes if it is designed to provide a hedge
               against a decline due to an adverse change in the exchange rate
               in the U.S. dollar value of a security which the Fund owns or has
               the right to acquire and which is denominated in the currency
               underlying the option. Call options on foreign currencies which
               are entered into for cross-hedging purposes are not covered.
               However, in such circumstances, the Fund will collateralize the
               option by segregating cash or other liquid assets in an amount
               not less than the value of the underlying foreign currency in
               U.S. dollars marked-to-market daily.
 
               OPTIONS ON SECURITIES. In an effort to increase current income
               and to reduce fluctuations in net asset value, the Fund may write
               covered put and call options and buy put and call options on
               securities that are traded on United States and foreign
               securities exchanges and over-the-counter. The Fund may write and
               buy options on the same types of securities that the Fund may
               purchase directly.
 
               A put option written by the Fund is "covered" if the Fund (i)
               segregates cash not available for investment or other liquid
               assets with a value equal to the exercise price of the put with
               the Fund's custodian or (ii) holds a put on the same security and
               in the same principal amount as the put written and the exercise
               price of the put held is equal to or greater than the exercise
               price of the put written. The premium paid by the buyer of an
               option will reflect, among other things, the relationship of the
               exercise
 
                                                                              29
<PAGE> 
 
               price to the market price and the volatility of the underlying
               security, the remaining term of the option, supply and demand and
               interest rates.
 
               A call option written by the Fund is "covered" if the Fund owns
               the underlying security covered by the call or has an absolute
               and immediate right to acquire that security without additional
               cash consideration (or for additional cash consideration held in
               a segregated account by the Fund's custodian) upon conversion or
               exchange of other securities held in its portfolio. A call option
               is also deemed to be covered if the Fund holds a call on the same
               security and in the same principal amount as the call written and
               the exercise price of the call held (i) is equal to or less than
               the exercise price of the call written or (ii) is greater than
               the exercise price of the call written if the difference is
               maintained by the Fund in cash and other liquid assets in a
               segregated account with its custodian.
 
               The Fund also may write call options that are not covered for
               cross-hedging purposes. The Fund collateralizes its obligation
               under a written call option for cross-hedging purposes by
               segregating cash or other liquid assets in an amount not less
               than the market value of the underlying security,
               marked-to-market daily. The Fund would write a call option for
               cross-hedging purposes, instead of writing a covered call option,
               when the premium to be received from the cross-hedge transaction
               would exceed that which would be received from writing a covered
               call option and its portfolio managers believe that writing the
               option would achieve the desired hedge.
 
               The writer of an option may have no control over when the
               underlying securities must be sold, in the case of a call option,
               or bought, in the case of a put option, since with regard to
               certain options, the writer may be assigned an exercise notice at
               any time prior to the termination of the obligation. Whether or
               not an option expires unexercised, the writer retains the amount
               of the premium. This amount, of course, may, in the case of a
               covered call option, be offset by a decline in the market value
               of the underlying security during the option period. If a call
               option is
 
 30
<PAGE> 
 
               exercised, the writer experiences a profit or loss from the sale
               of the underlying security. If a put option is exercised, the
               writer must fulfill the obligation to buy the underlying security
               at the exercise price, which will usually exceed the then market
               value of the underlying security.
 
               The writer of an option that wishes to terminate its obligation
               may effect a "closing purchase transaction." This is accomplished
               by buying an option of the same series as the option previously
               written. The effect of the purchase is that the writer's position
               will be canceled by the clearing corporation. However, a writer
               may not effect a closing purchase transaction after being
               notified of the exercise of an option. Likewise, an investor who
               is the holder of an option may liquidate its position by
               effecting a "closing sale transaction." This is accomplished by
               selling an option of the same series as the option previously
               bought. There is no guarantee that either a closing purchase or a
               closing sale transaction can be effected.
 
               In the case of a written call option, effecting a closing
               transaction will permit the Fund to write another call option on
               the underlying security with either a different exercise price or
               expiration date or both. In the case of a written put option,
               such transaction will permit the Fund to write another put option
               to the extent that the exercise price is secured by other liquid
               assets. Effecting a closing transaction also will permit the Fund
               to use the cash or proceeds from the concurrent sale of any
               securities subject to the option for other investments. If the
               Fund desires to sell a particular security from its portfolio on
               which it has written a call option, the Fund will effect a
               closing transaction prior to or concurrent with the sale of the
               security.
 
               The Fund will realize a profit from a closing transaction if the
               price of the purchase transaction is less than the premium
               received from writing the option or the price received from a
               sale transaction is more than the premium paid to buy the option.
               The Fund will realize a loss from a closing transaction if the
               price of the purchase transaction is more than the premium
               received from
 
                                                                              31
<PAGE> 
 
               writing the option or the price received from a sale transaction
               is less than the premium paid to buy the option. Because
               increases in the market of a call option generally will reflect
               increases in the market price of the underlying security, any
               loss resulting from the repurchase of a call option is likely to
               be offset in whole or in part by appreciation of the underlying
               security owned by the Fund.
 
               An option position may be closed out only where a secondary
               market for an option of the same series exists. If a secondary
               market does not exist, the Fund may not be able to effect closing
               transactions in particular options and the Fund would have to
               exercise the options in order to realize any profit. If the Fund
               is unable to effect a closing purchase transaction in a secondary
               market, it will not be able to sell the underlying security until
               the option expires or it delivers the underlying security upon
               exercise. The absence of a liquid secondary market may be due to
               the following: (i) insufficient trading interest in certain
               options, (ii) restrictions imposed by a national securities
               exchange ("Exchange") on which the option is traded on opening or
               closing transactions or both, (iii) trading halts, suspensions or
               other restrictions imposed with respect to particular classes or
               series of options or underlying securities, (iv) unusual or
               unforeseen circumstances that interrupt normal operations on an
               Exchange, (v) the facilities of an Exchange or of the Options
               Clearing Corporation ("OCC") may not at all times be adequate to
               handle current trading volume, or (vi) one or more Exchanges
               could, for economic or other reasons, decide or be compelled at
               some future date to discontinue the trading of options (or a
               particular class or series of options), in which event the
               secondary market on that Exchange (or in that class or series of
               options) would cease to exist, although outstanding options on
               that Exchange that had been issued by the OCC as a result of
               trades on that Exchange would continue to be exercisable in
               accordance with their terms.
 
               The Fund may write options in connection with buy-and-write
               transactions. In other words, the Fund may buy a security and
               then write a call option against that security. The exercise
               price of such call will depend upon the expected price movement
               of the
 
 32
<PAGE> 
 
               underlying security. The exercise price of a call option may be
               below ("in-the-money"), equal to ("at-the-money") or above ("out-
               of-the-money") the current value of the underlying security at
               the time the option is written. Buy-and-write transactions using
               in-the-money call options may be used when it is expected that
               the price of the underlying security will remain flat or decline
               moderately during the option period. Buy-and-write transactions
               using at-the-money call options may be used when it is expected
               that the price of the underlying security will remain fixed or
               advance moderately during the option period. Buy-and-write
               transactions using out-of-the-money call options may be used when
               it is expected that the premiums received from writing the call
               option plus the appreciation in the market price of the
               underlying security up to the exercise price will be greater than
               the appreciation in the price of the underlying security alone.
               If the call options are exercised in such transactions, the
               Fund's maximum gain will be the premium received by it for
               writing the option, adjusted upwards or downwards by the
               difference between the Fund's purchase price of the security and
               the exercise price. If the options are not exercised and the
               price of the underlying security declines, the amount of such
               decline will be offset by the amount of premium received.
 
               The writing of covered put options is similar in terms of risk
               and return characteristics to buy-and-write transactions. If the
               market price of the underlying security rises or otherwise is
               above the exercise price, the put option will expire worthless
               and the Fund's gain will be limited to the premium received. If
               the market price of the underlying security declines or otherwise
               is below the exercise price, the Fund may elect to close the
               position or take delivery of the security at the exercise price
               and the Fund's return will be the premium received from the put
               options minus the amount by which the market price of the
               security is below the exercise price.
 
               The Fund may buy put options to hedge against a decline in the
               value of its portfolio. By using put options in this way, the
               Fund will reduce any profit it might otherwise have realized in
               the
 
                                                                              33
<PAGE> 
 
               underlying security by the amount of the premium paid for the put
               option and by transaction costs.
 
               The Fund may buy call options to hedge against an increase in the
               price of securities that it may buy in the future. The premium
               paid for the call option plus any transaction costs will reduce
               the benefit, if any, realized by the Fund upon exercise of the
               option, and, unless the price of the underlying security rises
               sufficiently, the option may expire worthless to the Fund.
 
               EURODOLLAR INSTRUMENTS. The Fund may make investments in
               Eurodollar instruments. Eurodollar instruments are U.S. dollar-
               denominated futures contracts or options thereon which are linked
               to the London Interbank Offered Rate ("LIBOR"), although foreign
               currency-denominated instruments are available from time to time.
               Eurodollar futures contracts enable purchasers to obtain a fixed
               rate for the lending of funds and sellers to obtain a fixed rate
               for borrowings. The Fund might use Eurodollar futures contracts
               and options thereon to hedge against changes in LIBOR, to which
               many interest rate swaps and fixed-income instruments are linked.
 
               SWAPS AND SWAP-RELATED PRODUCTS. The Fund may enter into interest
               rate swaps, caps and floors on either an asset-based or
               liability-based basis, depending upon whether it is hedging its
               assets or its liabilities, and will usually enter into interest
               rate swaps on a net basis (i.e., the two payment streams are
               netted out, with the Fund receiving or paying, as the case may
               be, only the net amount of the two payments). The net amount of
               the excess, if any, of the Fund's obligations over its
               entitlement with respect to each interest rate swap will be
               calculated on a daily basis and an amount of cash or other liquid
               assets having an aggregate net asset value at least equal to the
               accrued excess will be maintained in a segregated account by the
               Fund's custodian. If the Fund enters into an interest rate swap
               on other than a net basis, it would maintain a segregated account
               in the full amount accrued on a daily basis of its obligations
               with respect to the swap. The Fund will not enter into any
               interest rate swap, cap or floor transaction unless the unsecured
               senior debt or the claims-paying ability of the other party
               thereto is rated in one of the
 
 34
<PAGE> 
 
               three highest rating categories of at least one NRSRO at the time
               of entering into such transaction. Janus Capital will monitor the
               creditworthiness of all counterparties on an ongoing basis. If
               there is a default by the other party to such a transaction, the
               Fund will have contractual remedies pursuant to the agreements
               related to the transaction.
 
               The swap market has grown substantially in recent years with a
               large number of banks and investment banking firms acting both as
               principals and as agents utilizing standardized swap
               documentation. Janus Capital has determined that, as a result,
               the swap market has become relatively liquid. Caps and floors are
               more recent innovations for which standardized documentation has
               not yet been developed and, accordingly, they are less liquid
               than swaps. To the extent the Fund sells (i.e., writes) caps and
               floors, it will segregate cash or other liquid assets having an
               aggregate net asset value at least equal to the full amount,
               accrued on a daily basis, of its obligations with respect to any
               caps or floors.
 
               There is no limit on the amount of interest rate swap
               transactions that may be entered into by the Fund. These
               transactions may in some instances involve the delivery of
               securities or other underlying assets by the Fund or its
               counterparty to collateralize obligations under the swap. Under
               the documentation currently used in those markets, the risk of
               loss with respect to interest rate swaps is limited to the net
               amount of the payments that the Fund is contractually obligated
               to make. If the other party to an interest rate swap that is not
               collateralized defaults, the Fund would risk the loss of the net
               amount of the payments that it contractually is entitled to
               receive. The Fund may buy and sell (i.e., write) caps and floors
               without limitation, subject to the segregation requirement
               described above.
 
               ADDITIONAL RISKS OF OPTIONS ON FOREIGN CURRENCIES, FORWARD
               CONTRACTS AND FOREIGN INSTRUMENTS. Unlike transactions entered
               into by the Fund in futures contracts, options on foreign
               currencies and forward contracts are not traded on contract
 
                                                                              35
<PAGE> 
 
               markets regulated by the CFTC or (with the exception of certain
               foreign currency options) by the SEC. To the contrary, such
               instruments are traded through financial institutions acting as
               market-makers, although foreign currency options are also traded
               on certain Exchanges, such as the Philadelphia Stock Exchange and
               the Chicago Board Options Exchange, subject to SEC regulation.
               Similarly, options on currencies may be traded over the-counter.
               In an over-the-counter trading environment, many of the
               protections afforded to Exchange participants will not be
               available. For example, there are no daily price fluctuation
               limits, and adverse market movements could therefore continue to
               an unlimited extent over a period of time. Although the buyer of
               an option cannot lose more than the amount of the premium plus
               related transaction costs, this entire amount could be lost.
               Moreover, an option writer and a buyer or seller of futures or
               forward contracts could lose amounts substantially in excess of
               any premium received or initial margin or collateral posted due
               to the potential additional margin and collateral requirements
               associated with such positions.
 
               Options on foreign currencies traded on Exchanges are within the
               jurisdiction of the SEC, as are other securities traded on
               Exchanges. As a result, many of the protections provided to
               traders on organized Exchanges will be available with respect to
               such transactions. In particular, all foreign currency option
               positions entered into on an Exchange are cleared and guaranteed
               by the OCC, thereby reducing the risk of counterparty default.
               Further, a liquid secondary market in options traded on an
               Exchange may be more readily available than in the over-the-
               counter market, potentially permitting the Fund to liquidate open
               positions at a profit prior to exercise or expiration, or to
               limit losses in the event of adverse market movements.
 
               The purchase and sale of exchange-traded foreign currency
               options, however, is subject to the risks of the availability of
               a liquid secondary market described above, as well as the risks
               regarding adverse market movements, margining of options written,
               the nature of the foreign currency market, possible intervention
               by governmental authorities and the effects of other
 
 36
<PAGE> 
 
               political and economic events. In addition, exchange-traded
               options on foreign currencies involve certain risks not presented
               by the over-the-counter market. For example, exercise and
               settlement of such options must be made exclusively through the
               OCC, which has established banking relationships in applicable
               foreign countries for this purpose. As a result, the OCC may, if
               it determines that foreign governmental restrictions or taxes
               would prevent the orderly settlement of foreign currency option
               exercises, or would result in undue burdens on the OCC or its
               clearing member, impose special procedures on exercise and
               settlement, such as technical changes in the mechanics of
               delivery of currency, the fixing of dollar settlement prices or
               prohibitions on exercise.
 
               In addition, options on U.S. government securities, futures
               contracts, options on futures contracts, forward contracts and
               options on foreign currencies may be traded on foreign exchanges
               and over-the-counter in foreign countries. Such transactions are
               subject to the risk of governmental actions affecting trading in
               or the prices of foreign currencies or securities. The value of
               such positions also could be adversely affected by (i) other
               complex foreign political and economic factors, (ii) lesser
               availability than in the United States of data on which to make
               trading decisions, (iii) delays in the Fund's ability to act upon
               economic events occurring in foreign markets during non-business
               hours in the United States, (iv) the imposition of different
               exercise and settlement terms and procedures and margin
               requirements than in the United States, and (v) low trading
               volume.
 
                                                                              37
<PAGE> 
Investment adviser
 
               As stated in the Prospectus, the Fund has an Investment Advisory
               Agreement with Janus Capital, 100 Fillmore Street, Denver,
               Colorado 80206-4928. The Advisory Agreement provides that Janus
               Capital will furnish continuous advice and recommendations
               concerning the Fund's investments, provide office space for the
               Fund, and pay the salaries, fees and expenses of all Fund
               officers and of those Trustees who are affiliated with Janus
               Capital. Janus Capital also may make payments to selected
               broker-dealer firms or institutions which perform recordkeeping
               or other services with respect to shareholder accounts. The
               minimum aggregate size required for eligibility for such
               payments, and the factors in selecting the broker-dealer firms
               and institutions to which they will be made, are determined from
               time to time by Janus Capital. Janus Capital is also authorized
               to perform the management and administrative services necessary
               for the operation of the Fund.
 
               The Fund pays custodian and transfer agent fees and expenses,
               brokerage commissions and dealer spreads and other expenses in
               connection with the execution of portfolio transactions, legal
               and accounting expenses, interest and taxes, registration fees,
               expenses of shareholders' meetings and reports to shareholders,
               fees and expenses of Trustees who are not affiliated with Janus
               Capital, costs of preparing, printing and mailing the Fund's
               Prospectus and SAI to current shareholders, and other costs of
               complying with applicable laws regulating the sale of Fund
               shares. Pursuant to the Advisory Agreement, Janus Capital
               furnishes certain other services, including net asset value
               determination and Fund accounting, recordkeeping, and blue sky
               registration and monitoring services, for which the Fund may
               reimburse Janus Capital for its costs.
 
               The Fund has agreed to compensate Janus Capital for its services
               by the monthly payment of a fee at the annual rate of 0.75% of
               the first $300 million of the Fund's average daily net assets,
               0.70% of the next $200 million of the Fund's average daily net
               assets, and 0.65% of the average daily net assets of the Fund in
               excess of $500 million.
 
   
               For the fiscal year ended October 31, 1998, the investment
               advisory fee was $8,032,427. For the fiscal years ended October
               31, 1997 and October 31, 1996, the Fund incurred
    
 
 38
<PAGE> 
 
               investment advisory fees of $9,406,417 and $12,316,252,
               respectively. Janus Capital did not waive any portion of its fee
               in any of these years.
 
               The Advisory Agreement is dated July 1, 1997, and it will
               continue in effect until July 1, 1999, and thereafter from year
               to year so long as such continuance is approved annually by a
               majority of the Fund's Trustees who are not parties to the
               Advisory Agreement or interested persons of any such party, and
               by either a majority of the outstanding voting shares or the
               Trustees of the Fund. The Advisory Agreement i) may be terminated
               without the payment of any penalty by the Fund or Janus Capital
               on 60 days' written notice; ii) terminates automatically in the
               event of its assignment; and iii) generally, may not be amended
               without the approval by vote of a majority of the Trustees of the
               Fund, including the Trustees who are not interested persons of
               the Fund or Janus Capital and, to the extent required by the 1940
               Act, the vote of a majority of the outstanding voting securities
               of the Fund.
 
               Janus Capital also acts as sub-adviser for a number of
               private-label mutual funds and provides separate account advisory
               services for institutional accounts. Investment decisions for
               each account managed by Janus Capital, including the Fund, are
               made independently from those for any other account that is or
               may in the future become managed by Janus Capital or its
               affiliates. If, however, a number of accounts managed by Janus
               Capital are contemporaneously engaged in the purchase or sale of
               the same security, the orders may be aggregated and/or the
               transactions may be averaged as to price and allocated equitably
               to each account. In some cases, this policy might adversely
               affect the price paid or received by an account or the size of
               the position obtained or liquidated for an account. Pursuant to
               an exemptive order granted by the SEC, the Fund and other funds
               advised by Janus Capital may also transfer daily uninvested cash
               balances into one or more joint trading accounts. Assets in the
               joint trading accounts are invested in money market instruments
               and the proceeds are allocated to the participating Funds on a
               pro rata basis.
 
                                                                              39
<PAGE> 
 
               Kansas City Southern Industries, Inc. ("KCSI") owns approximately
               82% of the outstanding voting stock of Janus Capital, most of
               which it acquired in 1984. KCSI is a publicly traded holding
               company whose primary subsidiaries are engaged in transportation,
               information processing and financial services. Thomas H. Bailey,
               President and Chairman of the Board of Janus Capital, owns
               approximately 12% of its voting stock and, by agreement with
               KCSI, selects a majority of Janus Capital's Board.
 
               KCSI has announced its intention to separate its transportation
               and financial services businesses. KCSI is currently studying
               alternatives for completion of the separation that meet its
               business objectives without risking adverse tax consequences.
               KCSI expects completion of the separation to be contemplated in
               1999.
 
               Each account managed by Janus Capital has its own investment
               objective and policies and is managed accordingly by a particular
               portfolio manager or team of portfolio managers. As a result,
               from time to time two or more different managed accounts may
               pursue divergent investment strategies with respect to
               investments or categories of investments.
 
               Janus Capital does not permit the Fund's portfolio managers to
               purchase and sell securities for their own accounts except under
               the limited exceptions contained in Janus Capital's policy
               regarding personal investing by directors/Trustees, officers and
               employees of Janus Capital and the Trust. The policy requires
               investment personnel and officers of Janus Capital, inside
               directors/Trustees of Janus Capital and the Fund and other
               designated persons deemed to have access to current trading
               information to pre-clear all transactions in securities not
               otherwise exempt under the policy. Requests for trading authority
               will be denied when, among other reasons, the proposed personal
               transaction would be contrary to the provisions of the policy or
               would be deemed to adversely affect any transaction known to be
               under consideration for or to have been effected on behalf of any
               client account, including the Fund.
 
               In addition to the pre-clearance requirement described above, the
               policy subjects investment personnel, officers and directors/
 
 40
<PAGE> 
 
               Trustees of Janus Capital and the Trust to various trading
               restrictions and reporting obligations. All reportable
               transactions are required to be reviewed for compliance with
               Janus Capital's policy. Those persons also may be required under
               certain circumstances to forfeit their profits made from personal
               trading.
 
               The provisions of the policy are administered by and subject to
               exceptions authorized by Janus Capital.
 
                                                                              41
<PAGE> 
Custodian, transfer agent and 
           certain affiliations
 
               State Street Bank and Trust Company, P.O. Box 0351, Boston,
               Massachusetts 02117-0351 is the custodian of the domestic
               securities and cash of the Fund. State Street and the foreign
               subcustodians selected by it and approved by the Trustees have
               custody of the assets of the Fund held outside the U.S. and cash
               incidental thereto. The custodian and subcustodians hold the
               Fund's assets in safekeeping and collect and remit the income
               thereon, subject to the instructions of the Fund.
 
               Janus Service Corporation, P.O. Box 173375, Denver, Colorado
               80217-3375, a wholly-owned subsidiary of Janus Capital, is the
               Fund's transfer agent. In addition, Janus Service provides
               certain other administrative, recordkeeping and shareholder
               relations services to the Fund. For transfer agency and other
               services, Janus Service receives a fee calculated at an annual
               rate of 0.16% of average net assets of the Fund. In addition, the
               Fund pays DST Systems, Inc. ("DST"), a subsidiary of KCSI,
               license fees at the rate of $3.06 per shareholder account for the
               use of DST's shareholder accounting system. The fund also pays
               DST $1.10 per closed shareholder account. The Fund pays DST for
               the use of its portfolio and fund accounting system a monthly
               base fee of $250 to $1,250 based on the number of Janus funds
               using the system and an asset charge of $1 per million dollars of
               net assets (not to exceed $500 per month). In addition, the Fund
               pays DST postage and forms costs of a DST affiliate incurred in
               mailing Fund shareholder transaction confirmations.
 
               The Trustees have authorized the Fund to use another affiliate of
               DST as introducing broker for certain Fund portfolio transactions
               as a means to reduce Fund expenses through credits against the
               charges of DST and its affiliates with regard to commissions
               earned by such affiliate. See "Portfolio Transactions and
               Brokerage."
 
               Janus Distributors, Inc., 100 Fillmore Street, Denver, Colorado
               80206-4928, a wholly-owned subsidiary of Janus Capital, is a
               distributor of the Fund. Janus Distributors is registered as a
               broker-dealer under the Securities Exchange Act of 1934 and is a
               member of the National Association of Securities Dealers, Inc.
               Janus Distributors acts as the agent of the Fund in connection
 
 42
<PAGE> 
 
               with the sale of its shares in all states in which the shares are
               registered and in which Janus Distributors is qualified as a
               broker-dealer. Under the Distribution Agreement, Janus
               Distributors continuously offers the Fund's shares and accepts
               orders at net asset value. No sales charges are paid by
               investors. Promotional expenses in connection with offers and
               sales of shares are paid by Janus Capital.
 
                                                                              43
<PAGE> 
Portfolio transactions and brokerage
 
               Decisions as to the assignment of portfolio business for the Fund
               and negotiation of its commission rates are made by Janus
               Capital, whose policy is to obtain the "best execution" (prompt
               and reliable execution at the most favorable security price) of
               all portfolio transactions. The Fund may trade foreign securities
               in foreign countries because the best available market for these
               securities is often on foreign exchanges. In transactions on
               foreign stock exchanges, brokers' commissions are frequently
               fixed and are often higher than in the United States, where
               commissions are negotiated.
 
               In selecting brokers and dealers and in negotiating commissions,
               Janus Capital considers a number of factors, including but not
               limited to: Janus Capital's knowledge of currently available
               negotiated commission rates or prices of securities currently
               available and other current transaction costs; the nature of the
               security being traded; the size and type of the transaction; the
               nature and character of the markets for the security to be
               purchased or sold; the desired timing of the trade; the activity
               existing and expected in the market for the particular security;
               confidentiality; the quality of the execution, clearance and
               settlement services; financial stability of the broker or dealer;
               the existence of actual or apparent operational problems of any
               broker or dealer; rebates of commissions by a broker to the Fund
               or to a third party service provider to the Fund to pay Fund
               expenses; and research products or services provided. In
               recognition of the value of the foregoing factors, Janus Capital
               may place portfolio transactions with a broker or dealer with
               whom it has negotiated a commission that is in excess of the
               commission another broker or dealer would have charged for
               effecting that transaction if Janus Capital determines in good
               faith that such amount of commission was reasonable in relation
               to the value of the brokerage and research provided by such
               broker or dealer viewed in terms of either that particular
               transaction or of the overall responsibilities of Janus Capital.
               Research may include furnishing advice, either directly or
               through publications or writings, as to the value of securities,
               the advisability of purchasing or selling specific securities and
               the availability of securities or purchasers or sellers of
               securities; furnishing seminars, information, analyses and
 
 44
<PAGE> 
 
               reports concerning issuers, industries, securities, trading
               markets and methods, legislative developments, changes in
               accounting practices, economic factors and trends and portfolio
               strategy; access to research analysts, corporate management
               personnel, industry experts, economists and government officials;
               comparative performance evaluation and technical measurement
               services and quotation services, and products and other services
               (such as third party publications, reports and analyses, and
               computer and electronic access, equipment, software, information
               and accessories that deliver, process or otherwise utilize
               information, including the research described above) that assist
               Janus Capital in carrying out its responsibilities.
 
   
               Most brokers and dealers used by Janus Capital provide research
               and other services described above. For the year ended October
               31, 1998, the Fund paid $557,951 of its total brokerage
               commissions to brokers and dealers in transactions identified for
               execution primarily on the basis of research and other services
               provided to the Fund on transactions of $328,322,385. Research
               received from brokers or dealers is supplemental to Janus
               Capital's own research efforts.
    
 
               Janus Capital may use research products and services in servicing
               other accounts in addition to the Fund. If Janus Capital
               determines that any research product or service has a mixed use,
               such that it also serves functions that do not assist in the
               investment decision-making process, Janus Capital may allocate
               the costs of such service or product accordingly. Only that
               portion of the product or service that Janus Capital determines
               will assist it in the investment decision-making process may be
               paid for in brokerage commission dollars. Such allocation may
               create a conflict of interest for Janus Capital.
 
               Janus Capital does not enter into agreements with any brokers
               regarding the placement of securities transactions because of the
               research services they provide. It does, however, have an
               internal procedure for allocating transactions in a manner
               consistent with its execution policy to brokers that it has
               identified as providing
 
                                                                              45
<PAGE> 
 
               superior execution and research, research-related products or
               services which benefit its advisory clients, including the Fund.
               Research products and services incidental to effecting securities
               transactions furnished by brokers or dealers may be used in
               servicing any or all of Janus Capital's clients and such research
               may not necessarily be used by Janus Capital in connection with
               the accounts which paid commissions to the broker-dealer
               providing such research products and services.
 
               Janus Capital may consider sales of Fund shares by a broker-
               dealer or the recommendation of a broker-dealer to its customers
               that they purchase Fund shares as a factor in the selection of
               broker-dealers to execute Fund portfolio transactions. Janus
               Capital may also consider payments made by brokers effecting
               transactions for the Fund i) to the Fund or ii) to other persons
               on behalf of the Fund for services provided to the Fund for which
               it would be obligated to pay. In placing portfolio business with
               such broker-dealers, Janus Capital will seek the best execution
               of each transaction.
 
               When the Fund purchases or sells a security in the over-the-
               counter market, the transaction takes place directly with a
               principal market-maker, without the use of a broker, except in
               those circumstances where in the opinion of Janus Capital better
               prices and executions will be achieved through the use of a
               broker.
 
               The Fund's Trustees have authorized Janus Capital to place
               transactions with DST Securities, Inc. ("DSTS"), a wholly-owned
               broker-dealer subsidiary of DST. Janus Capital may do so if it
               reasonably believes that the quality of the transaction and the
               associated commission are fair and reasonable and if, overall,
               the associated transaction costs, net of any credits described
               above under "Custodian, Transfer Agent and Certain Affiliations,"
               are lower than those that would otherwise be incurred.
 
   
               The total amount of brokerage commissions paid by the Fund during
               the fiscal year ended October 31, 1998, was $1,688,512. For the
               fiscal years ended October 31, 1997 and October 31, 1996, the
               Fund paid brokerage commissions of $3,599,484 and
    
 
 46
<PAGE> 
 
   
               $3,945,142, respectively. Included in the brokerage commissions
               paid for the fiscal year ended October 31, 1998, was $15,909 paid
               through DSTS, which served to reduce by $11,932 certain
               out-of-pocket expenses paid by the Fund. Included in brokerage
               commissions paid for the fiscal years ended October 31, 1997 and
               October 31, 1996, was $51,096 and $64,665, respectively, paid
               through DSTS which served to reduce by $38,322 and $48,499,
               respectively, certain out-of-pocket expenses. Brokerage
               commissions paid through DSTS for the 1998 fiscal year
               represented 0.94% of the Fund's aggregate brokerage commissions
               for such fiscal year, while 0.66% of the aggregate dollar amount
               of the Fund's portfolio transactions involving a commission
               payment were executed through DSTS. The difference between
               commissions paid through DSTS and expenses reduced constitute
               commissions paid to an unaffiliated clearing broker. Differences
               in the percentage of total commissions versus the percentage of
               total transactions is due, in part, to variations among share
               prices and number of shares traded, while average price per share
               commission rates were substantially the same.
    
 
   
               As of October 31, 1998, the Fund did not own securities of
               regular broker-dealers (or parents).
    
   
    
 
                                                                              47
<PAGE> 
Trustees and officers
 
               The following are the names of the Trustees and officers of the
               Trust, together with a brief description of their principal
               occupations during the last five years. In August 1992, Janus
               Venture Fund, Inc. and Janus Twenty Fund, Inc. (both separate
               Maryland corporations) and the Janus Income Series (a
               Massachusetts business trust comprised of Janus Flexible Income
               Fund series) were reorganized into separate series of the Trust.
               In general, all references to Trust offices in this section
               include comparable offices with the respective predecessor funds,
               unless a Trust office was filled subsequent to the
               reorganization.
 
Thomas H. Bailey, Age 61 - Trustee, Chairman and President*#
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Trustee, Chairman and President of Janus Aspen Series. Chairman,
               Chief Executive Officer, Director and President of Janus Capital.
               Director of Janus Distributors, Inc.
 
James P. Craig, III, Age 42 - Trustee and Executive Vice President*#
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Trustee and Executive Vice President of Janus Aspen Series. Chief
               Investment Officer, Vice Chairman and Director of Janus Capital.
               Executive Vice President and Portfolio Manager of Janus Fund.
               Executive Vice President and Co-Manager of Janus Venture Fund.
 
Gary O. Loo, Age 58 - Trustee#
102 N. Cascade, Suite 500
Colorado Springs, CO 80903
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. President and Director of High
               Valley Group, Inc., Colorado Springs, CO (investments).
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
#Member of the Trust's Executive Committee.
 
 48
<PAGE> 
 
Dennis B. Mullen, Age 55 - Trustee
7500 E. McCormick Parkway, #24
Scottsdale, AZ 85258
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Private Investor. Formerly (1997-
               1998), Chief Financial Officer-Boston Market Concepts, Boston
               Chicken, Inc., Golden, CO (restaurant chain); (1993-1997),
               President and Chief Executive Officer of BC Northwest, L.P., a
               franchise of Boston Chicken, Inc., Bellevue, WA (restaurant
               chain).
 
James T. Rothe, Age 55 - Trustee
102 South Tejon Street, Suite 1100
Colorado Springs, CO 80903
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Professor of Business, University
               of Colorado, Colorado Springs, CO. Principal, Phillips-Smith
               Retail Group, Colorado Springs, CO (a venture capital firm).
               Formerly (1986-1994), Dean of the College of Business, University
               of Colorado, Colorado Springs, CO.
 
William D. Stewart, Age 54 - Trustee#
5330 Sterling Drive
Boulder, CO 80302
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. President of HPS Division of MKS
               Instruments, Boulder, CO (manufacturer of vacuum fittings and
               valves).
 
- --------------------------------------------------------------------------------
#Member of the Trust's Executive Committee.
 
                                                                              49
<PAGE> 
 
Martin H. Waldinger, Age 60 - Trustee
4940 Sandshore Court
San Diego, CA 92130
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Private Consultant. Formerly
               (1993-1996), Director of Run Technologies, Inc., a software
               development firm, San Carlos, CA.
 
William H. Bales, Age 30 - Executive Vice President*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Portfolio Manager of Janus Venture
               Fund. Formerly, research analyst at Janus Capital (1993-1996).
 
Jonathan D. Coleman, Age 27 - Executive Vice President*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Portfolio Manager of Janus Venture
               Fund. Formerly, research analyst at Janus Capital (1994-1996).
               Fulbright Fellow (1993-1994).
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
 
 50
<PAGE> 
 
Thomas A. Early, Age 44 - Vice President and General Counsel*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Vice President and General Counsel of Janus Aspen Series. Vice
               President, General Counsel and Secretary of Janus Capital. Vice
               President and General Counsel of Janus Service Corporation, Janus
               Distributors, Inc. and Janus Capital International, Ltd. Director
               of Janus World Funds Plc. Formerly (1997-1998), Executive Vice
               President and General Counsel of Prudential Investments Fund
               Management LLC, Newark, NJ. Formerly (1994-1997), Vice President
               and General Counsel of Prudential Retirement Services, Newark,
               NJ. Formerly (1988-1994), Associate General Counsel and Chief
               Financial Services Counsel, Frank Russell Company, Tacoma, WA.
 
Steven R. Goodbarn, Age 41 - Vice President and Chief Financial Officer*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Vice President and Chief Financial Officer of Janus Aspen Series.
               Vice President of Finance, Treasurer and Chief Financial Officer
               of Janus Capital, Janus Service Corporation and Janus
               Distributors, Inc. Director of Janus Service Corporation, Janus
               Distributors, Inc. and Janus World Funds Plc. Director, Treasurer
               and Vice President of Finance of Janus Capital International Ltd.
               Formerly (May 1992-January 1996), Treasurer of Janus Investment
               Fund and Janus Aspen Series.
 
- --------------------------------------------------------------------------------
   
*Interested person of the Trust and of Janus Capital.
    
 
                                                                              51
<PAGE> 
 
Kelley Abbott Howes, Age 33 - Assistant Vice President and Secretary*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Assistant Vice President and Secretary of Janus Aspen Series.
               Director and President of Janus Distributors, Inc. Assistant Vice
               President and Associate Counsel of Janus Capital. Formerly (1990-
               1994), with The Boston Company Advisors, Inc., Boston, MA (mutual
               fund administration services).
 
Glenn P. O'Flaherty, Age 40 - Treasurer and Chief Accounting Officer*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Treasurer and Chief Accounting Officer of Janus Aspen Series.
               Vice President of Janus Capital. Formerly (1991 to 1997),
               Director of Fund Accounting, Janus Capital.
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
 
 52
<PAGE> 
 
               The Trustees are responsible for major decisions relating to the
               Fund's objective, policies and techniques. The Trustees also
               supervise the operation of the Fund by its officers and review
               the investment decisions of the officers, although they do not
               actively participate on a regular basis in making such decisions.
 
               The Trust's Executive Committee shall have and may exercise all
               the powers and authority of the Trustees except for matters
               requiring action by all Trustees pursuant to the Trust's Bylaws
               or Agreement and Declaration of Trust, Massachusetts law or the
               1940 Act.
 
               The following table shows the aggregate compensation earned by
               and paid to each Trustee by the Fund described in this SAI and
               all funds advised and sponsored by Janus Capital (collectively,
               the "Janus Funds") for the periods indicated. None of the
               Trustees receives any pension or retirement benefits from the
               Fund or the Janus Funds.
 
   
<TABLE>
<CAPTION>
                                              Aggregate Compensation      Total Compensation
                                                from the Fund for      from the Janus Funds for
                                                fiscal year ended        calendar year ended
          Name of Person, Position               October 31, 1998        December 31, 1998**
- ------------------------------------------------------------------------------------------------
<S>                                           <C>                     <C>
Thomas H. Bailey, Chairman and Trustee*                 $0                        $0
James P. Craig, Trustee*                                $0                        $0
William D. Stewart, Trustee                           $1,519                   $82,000
Gary O. Loo, Trustee                                  $1,181                   $74,000
Dennis B. Mullen, Trustee                             $1,380                   $82,000
Martin H. Waldinger, Trustee                          $1,450                   $74,000
James T. Rothe, Trustee                               $1,395                   $82,000
</TABLE>
    
 
 *An interested person of the Fund and of Janus Capital. Compensated by Janus
  Capital and not the Fund.
   
**As of December 31, 1998, Janus Funds consisted of two registered investment
  companies comprised of a total of 32 funds.
    
 
                                                                              53
<PAGE> 
Purchase of shares
 
               The Fund has discontinued public sales of its shares to new
               investors. Only shareholders who maintain open accounts are
               permitted to continue to make investments in the Fund and to
               reinvest any dividends and capital gains distributions. Once a
               Fund account is closed, additional investments in the Fund may
               not be possible. The Shareholder's Manual section of the
               Prospectus contains detailed information about the purchase of
               shares.
 
NET ASSET VALUE DETERMINATION
 
               As stated in the Prospectus, the net asset value ("NAV") of Fund
               shares is determined once each day on which the New York Stock
               Exchange ("NYSE") is open, at the close of its regular trading
               session (normally 4:00 p.m., New York time, Monday through
               Friday). As stated in the Prospectus, the NAV of Fund shares is
               not determined on days the NYSE is closed (generally, New Year's
               Day, Presidents' Day, Martin Luther King Day, Good Friday,
               Memorial Day, Independence Day, Labor Day, Thanksgiving and
               Christmas). The per share NAV of the Fund is determined by
               dividing the total value of the Fund's securities and other
               assets, less liabilities, by the total number of shares
               outstanding. In determining NAV, securities listed on an
               Exchange, the NASDAQ National Market and foreign markets are
               valued at the closing prices on such markets, or if such price is
               lacking for the trading period immediately preceding the time of
               determination, such securities are valued at their current bid
               price. Municipal securities held by the Fund are traded primarily
               in the over-the-counter market. Valuations of such securities are
               furnished by one or more pricing services employed by the Fund
               and are based upon a computerized matrix system or appraisals
               obtained by a pricing service, in each case in reliance upon
               information concerning market transactions and quotations from
               recognized municipal securities dealers. Other securities that
               are traded on the over-the-counter market are valued at their
               closing bid prices. Foreign securities and currencies are
               converted to U.S. dollars using the exchange rate in effect at
               the close of the NYSE. The Fund will determine the market value
               of individual securities held by it, by using prices provided by
               one or more professional pricing services
 
 54
<PAGE> 
 
               which may provide market prices to other funds, or, as needed, by
               obtaining market quotations from independent broker-dealers.
               Short-term securities maturing within 60 days are valued on an
               amortized cost basis. Securities for which quotations are not
               readily available, and other assets, are valued at fair values
               determined in good faith under procedures established by and
               under the supervision of the Trustees.
 
               Trading in securities on European and Far Eastern securities
               exchanges and over-the-counter markets is normally completed well
               before the close of business on each business day in New York
               (i.e., a day on which the NYSE is open). In addition, European or
               Far Eastern securities trading generally or in a particular
               country or countries may not take place on all business days in
               New York. Furthermore, trading takes place in Japanese markets on
               certain Saturdays and in various foreign markets on days which
               are not business days in New York and on which the Fund's NAV is
               not calculated. The Fund calculates its NAV per share, and
               therefore effects sales, redemptions and repurchases of its
               shares, as of the close of the NYSE once on each day on which the
               NYSE is open. Such calculation may not take place
               contemporaneously with the determination of the prices of the
               foreign portfolio securities used in such calculation.
 
REINVESTMENT OF DIVIDENDS AND DISTRIBUTIONS
 
               If investors do not elect in writing or by phone to receive their
               dividends and distributions in cash, all income dividends and
               capital gains distributions, if any, on the Fund's shares are
               reinvested automatically in additional shares of the Fund at the
               NAV determined on the payment date. Checks for cash dividends and
               distributions and confirmations of reinvestments are usually
               mailed to shareholders within ten days after the record date. Any
               election of the manner in which a shareholder wishes to receive
               dividends and distributions (which may be made on the New Account
               Application form or by phone) will apply to dividends and
               distributions the record dates of which fall on or after the date
               that the Fund receives such notice. Changes to distribution
 
                                                                              55
<PAGE> 
 
               options must be received at least three days prior to the record
               date to be effective for such date. Investors receiving cash
               distributions and dividends may elect in writing or by phone to
               change back to automatic reinvestment at any time.
 
 56
<PAGE> 
Redemption of shares
 
               Procedures for redemption of shares are set forth in the
               Shareholder's Manual section of the Prospectus. Shares normally
               will be redeemed for cash, although the Fund retains the right to
               redeem its shares in kind under unusual circumstances, in order
               to protect the interests of remaining shareholders, by delivery
               of securities selected from its assets at its discretion.
               However, the Fund is governed by Rule 18f-1 under the 1940 Act,
               which requires the Fund to redeem shares solely in cash up to the
               lesser of $250,000 or 1% of the NAV of the Fund during any 90-day
               period for any one shareholder. Should redemptions by any
               shareholder exceed such limitation, the Fund will have the option
               of redeeming the excess in cash or in kind. If shares are
               redeemed in kind, the redeeming shareholder might incur brokerage
               costs in converting the assets to cash. The method of valuing
               securities used to make redemptions in kind will be the same as
               the method of valuing portfolio securities described under
               "Purchase of Shares D Net Asset Value Determination" and such
               valuation will be made as of the same time the redemption price
               is determined.
 
               The right to require the Fund to redeem its shares may be
               suspended, or the date of payment may be postponed, whenever (1)
               trading on the NYSE is restricted, as determined by the SEC, or
               the NYSE is closed except for holidays and weekends, (2) the SEC
               permits such suspension and so orders, or (3) an emergency exists
               as determined by the SEC so that disposal of securities or
               determination of NAV is not reasonably practicable.
 
                                                                              57
<PAGE> 
Shareholder accounts
 
               Detailed information about the general procedures for shareholder
               accounts and specific types of accounts is set forth in the
               Prospectus. Applications for specific types of accounts may be
               obtained by calling the Fund at 1-800-525-3713 or writing to the
               Fund at P.O. Box 173375, Denver, Colorado 80217-3375.
 
TELEPHONE TRANSACTIONS
 
               As stated in the Prospectus, shareholders may initiate a number
               of transactions by telephone. The Fund, its transfer agent and
               its distributor disclaim responsibility for the authenticity of
               instructions received by telephone. Such entities will employ
               reasonable procedures to confirm that instructions communicated
               by telephone are genuine. Such procedures may include, among
               others, requiring personal identification prior to acting upon
               telephone instructions, providing written confirmation of the
               transactions and tape recording telephone conversations.
 
SYSTEMATIC REDEMPTIONS
 
               As stated in the Shareholder's Manual section of the Prospectus,
               if you have a regular account or are eligible for distributions
               from a retirement plan, you may establish a systematic redemption
               option. The payments will be made from the proceeds of periodic
               redemptions of shares in the account at the NAV. Depending on the
               size or frequency of the disbursements requested, and the
               fluctuation in value of the Fund's portfolio, redemptions for the
               purpose of making such disbursements may reduce or even exhaust
               the shareholder's account. Either an investor or the Fund, by
               written notice to the other, may terminate the investor's
               systematic redemption option without penalty at any time.
 
               Information about requirements to establish a systematic
               redemption option may be obtained by writing or calling the Fund
               at the address or phone number shown above.
 
 58
<PAGE> 
Tax-deferred accounts
 
               The Fund offers several different types of tax-deferred accounts
               that an investor may establish to invest in Fund shares,
               depending on rules prescribed by the Code. Traditional and Roth
               Individual Retirement Accounts may be used by most individuals
               who have taxable compensation. Simplified Employee Pensions and
               Defined Contribution Plans (Profit Sharing or Money Purchase
               Pension Plans) may be used by most employers, including
               corporations, partnerships and sole proprietors, for the benefit
               of business owners and their employees. Education IRAs allow
               individuals, subject to certain income limitations, to contribute
               up to $500 annually on behalf of any child under the age of 18.
               In addition, the Fund offers a Section 403(b)(7) Plan for
               employees of educational organizations and other qualifying
               tax-exempt organizations. Investors should consult their tax
               adviser or legal counsel before selecting a tax-deferred account.
 
   
               Contributions under Traditional and Roth IRAs, Education IRAs,
               SEPs, Defined Contribution Plans and Section 403(b)(7) Plans are
               subject to specific contribution limitations. Generally, such
               contributions may be invested at the direction of the
               participant. The investment is then held by Investors Fiduciary
               Trust Company as custodian. Each participant's account is charged
               an annual fee of $12 per taxpayer identification number no matter
               how many tax-deferred accounts the participant has with Janus.
               The custodian reserves the right to change the amount of this fee
               or to waive it in whole or in part for certain types of accounts.
    
 
               Distributions from tax-deferred accounts may be subject to
               ordinary income tax and may be subject to an additional 10% tax
               if withdrawn prior to age 59 1/2 or used for a nonqualifying
               purpose. Additionally, shareholders generally must start
               withdrawing retirement plan assets no later than April 1 of the
               year after they reach age 70 1/2. Several exceptions to these
               general rules may apply and several methods exist to determine
               the amount and timing of the minimum annual distribution (if
               any). Shareholders should consult with their tax adviser or legal
               counsel prior to receiving any distribution from any tax-deferred
               account, in order to determine the income tax impact of any such
               distribution.
 
                                                                              59
<PAGE> 
 
               To receive additional information about Traditional and Roth
               IRAs, SEPs, Defined Contribution Plans and Section 403(b)(7)
               Plans along with the necessary materials to establish an account,
               please call the Fund at 1-800-525-3713 or write to the Fund at
               P.O. Box 173375, Denver, Colorado 80217-3375. No contribution to
               a Traditional or Roth IRA, SEP, Defined Contribution Plan or
               Section 403(b)(7) Plan can be made until the appropriate forms to
               establish any such plan have been completed.
 
 60
<PAGE> 
Income dividends, capital gains 
       distributions and tax status
 
               It is a policy of the Fund to make distributions of substantially
               all of its investment income and any net realized capital gains.
               Any capital gains realized during each fiscal year of the Fund
               ended October 31, as defined by the Code, are normally declared
               and payable to shareholders in December. The Fund intends to
               qualify as a regulated investment company by satisfying certain
               requirements prescribed by Subchapter M of the Code. Accordingly,
               the Fund will invest no more than 25% of its total assets in a
               single issuer (other than U.S. government securities).
 
               The Fund may purchase securities of certain foreign corporations
               considered to be passive foreign investment companies by the IRS.
               In order to avoid taxes and interest that must be paid by the
               Fund, if these instruments are profitable, the Fund may make
               various elections permitted by the tax laws. However, these
               elections could require that the Fund recognize taxable income,
               which in turn must be distributed.
 
               Some foreign securities purchased by the Fund may be subject to
               foreign taxes which could reduce the yield on such securities.
               The amount of such foreign taxes is expected to be insignificant.
               Accordingly, the Fund does not intend to make the election
               permitted under section 853 of the Code to pass through such
               taxes to shareholders as a foreign tax credit as this would
               increase the taxable income reported to shareholders and require
               shareholders to take the credit on their tax returns,
               complicating the preparation of such returns. As a result, any
               foreign taxes paid or accrued will represent an expense to the
               Fund which will reduce its investment company taxable income.
 
                                                                              61
<PAGE> 
Principal shareholders
 
   
               As of January 20, 1999, the officers and Trustees of the Fund as
               a group owned less than 1% of the outstanding shares of the Fund.
               In addition, as of January 20, 1999, Charles Schwab & Co., Inc.
               101 Montgomery Street, San Francisco, CA 94104-4122, owned 8.67%
               of the outstanding shares of the Fund.
    
 
   
               According to information provided by Charles Schwab & Co., Inc.,
               this ownership is by nominee only and does not represent
               beneficial ownership of such shares, because they have no
               investment discretion or voting power with respect to such
               shares.
    
 
 62
<PAGE> 
Miscellaneous information
 
               The Fund was originally organized in 1984 as a Maryland
               corporation. On August 7, 1992, the Fund was reorganized from a
               Maryland corporation into Janus Venture Fund, a separate series
               of the Trust. Pursuant to this reorganization, the Trust assumed
               all the assets and liabilities of Janus Venture Fund, Inc., and
               shareholders received shares of Janus Venture Fund series of the
               Trust equal both in number and net asset value to their shares of
               Janus Venture Fund, Inc. All references in this SAI to the Fund
               and all financial and other information about the Fund prior to
               August 7, 1992 are to the former Janus Venture Fund, Inc.; all
               references after August 7, 1992, are to the Janus Venture Fund
               series of the Trust. As the result of the reorganization, the
               fiscal year end of the Fund changed from July 31 to October 31.
               As of the date of this SAI, the Trust offers 21 separate series,
               three of which currently offer three classes of shares.
 
               Janus Capital reserves the right to the name "Janus." In the
               event that Janus Capital does not continue to provide investment
               advice to the Fund, the Fund must cease to use the name "Janus"
               as soon as reasonably practicable.
 
               Under Massachusetts law, shareholders of the Fund could, under
               certain circumstances, be held liable for the obligations of the
               Fund. However, the Declaration of Trust disclaims shareholder
               liability for acts or obligations of the Fund and requires that
               notice of this disclaimer be given in each agreement, obligation
               or instrument entered into or executed by the Fund or the
               Trustees. The Declaration of Trust also provides for
               indemnification from the assets of the Fund for all losses and
               expenses of any Fund shareholder held liable for the obligations
               of the Fund. Thus, the risk of a shareholder incurring a
               financial loss on account of its liability as a shareholder of
               the Fund is limited to circumstances in which the Fund would be
               unable to meet its obligations. The possibility that these
               circumstances would occur is remote. The Trustees intend to
               conduct the operations of the Fund to avoid, to the extent
               possible, liability of shareholders for liabilities of the Fund.
 
                                                                              63
<PAGE> 
 
SHARES OF THE TRUST
 
               The Trust is authorized to issue an unlimited number of shares of
               beneficial interest with a par value of one cent per share for
               each series of the Trust. Shares of the Fund are fully paid and
               nonassessable when issued. All shares of the Fund participate
               equally in dividends and other distributions by the Fund, and in
               residual assets of the Fund in the event of liquidation. Shares
               of the Fund have no preemptive, conversion or subscription
               rights. Shares of the Fund may be transferred by endorsement or
               stock power as is customary, but the Fund is not bound to
               recognize any transfer until it is recorded on its books.
 
SHAREHOLDER MEETINGS
 
               The Trust does not intend to hold annual shareholder meetings.
               However, special meetings may be called for a specific Fund or
               for the Trust as a whole for purposes such as electing or
               removing Trustees, terminating or reorganizing the Trust,
               changing fundamental policies, or for any other purpose requiring
               a shareholder vote under the 1940 Act. Separate votes are taken
               by the Fund only if a matter affects or requires the vote of only
               the Fund or the Fund's interest in the matter differs from the
               interest of other portfolios of the Trust. As a shareholder, you
               are entitled to one vote for each share that you own.
 
VOTING RIGHTS
 
               The present Trustees were elected at a meeting of shareholders
               held on July 10, 1992, with the exception of Mr. Craig and Mr.
               Rothe who were appointed by the Trustees as of June 30, 1995 and
               January 1, 1997, respectively. Under the Declaration of Trust,
               each Trustee will continue in office until the termination of the
               Trust or his earlier death, retirement, resignation, bankruptcy,
               incapacity or removal. Vacancies will be filled by a majority of
               the remaining Trustees, subject to the 1940 Act. Therefore, no
               annual or regular meetings of shareholders normally will be held,
               unless otherwise required by the Declaration of Trust or the 1940
               Act. Subject to the foregoing, shareholders have the power to
               vote to elect or remove Trustees, to terminate or reorganize the
               Fund, to
 
 64
<PAGE> 
 
               amend the Declaration of Trust, to bring certain derivative
               actions and on any other matters on which a shareholder vote is
               required by the 1940 Act, the Declaration of Trust, the Trust's
               Bylaws or the Trustees.
 
               As mentioned above in "Shareholder Meetings," each share of the
               Fund and of each other series of the Trust has one vote (and
               fractional votes for fractional shares). Shares of all series of
               the Trust have noncumulative voting rights, which means that the
               holders of more than 50% of the shares of all series of the Trust
               voting for the election of Trustees can elect 100% of the
               Trustees if they choose to do so and, in such event, the holders
               of the remaining shares will not be able to elect any Trustees.
 
MASTER/FEEDER OPTION
 
               The Trust may in the future seek to achieve the Fund's objective
               by investing all of the Fund's assets in another investment
               company having the same investment objective and substantially
               the same investment policies and restrictions as those applicable
               to the Fund. Unless otherwise required by law, this policy may be
               implemented by the Trustees without shareholder approval.
 
INDEPENDENT ACCOUNTANTS
 
               PricewaterhouseCoopers LLP, 950 Seventeenth Street, Suite 2500,
               Denver, Colorado 80202, independent accountants for the Fund,
               audit the Fund's annual financial statements and prepare its tax
               returns.
 
REGISTRATION STATEMENT
 
               The Trust has filed with the SEC, Washington, D.C., a
               Registration Statement under the Securities Act of 1933, as
               amended, with respect to the securities to which this SAI
               relates. If further information is desired with respect to the
               Fund or such securities, reference is made to the Registration
               Statement and the exhibits filed as a part thereof.
 
                                                                              65
<PAGE> 
Performance information
 
               Quotations of average annual total return for the Fund will be
               expressed in terms of the average annual compounded rate of
               return of a hypothetical investment in the Fund over periods of
               1, 5, and 10 years (up to the life of the Fund). These are the
               annual total rates of return that would equate the initial amount
               invested to the ending redeemable value. These rates of return
               are calculated pursuant to the following formula: P(1 + T)n = ERV
               (where P = a hypothetical initial payment of $1,000, T = the
               average annual total return, n = the number of years and
               ERV = the ending redeemable value of a hypothetical $1,000
               payment made at the beginning of the period). All total return
               figures reflect the deduction of a proportional share of Fund
               expenses on an annual basis, and assume that all dividends and
               distributions are reinvested when paid.
 
   
               The Fund was made available for public sale on April 30, 1985.
               The one year, five year, ten year and lifetime average annual
               total returns, computed as of October 31, 1998, for each of those
               periods, are 1.07%, 10.28%, 14.55% and 15.28%, respectively.
    
 
               From time to time in advertisements or sales material, the Fund
               may discuss its performance ratings or other information as
               published by recognized mutual fund statistical rating services,
               including, but not limited to, Lipper Analytical Services, Inc.
               ("Lipper"), Ibbotson Associates, Micropal or Morningstar, Inc.
               ("Morningstar") or by publications of general interest such as
               Forbes, Money, The Wall Street Journal, Mutual Funds Magazine,
               Kiplinger's or Smart Money. The Fund may also compare its
               performance to that of other selected mutual funds (for example,
               peer groups created by Lipper or Morningstar), mutual fund
               averages or recognized stock market indicators, including, but
               not limited to, the Russell 2000 Index and the NASDAQ composite.
               In addition, the Fund may compare its total return to the yield
               on U.S. Treasury obligations and to the percentage change in the
               Consumer Price Index. Such performance ratings or comparisons may
               be made with funds that may have different investment
               restrictions, objectives, policies or techniques than the Fund
               and such other funds or market indicators may be comprised of
               securities that differ significantly from the Fund's investments.
 
 66
<PAGE> 
Financial statements
 
   
               The following audited financial statements for the period ended
               October 31, 1998 are hereby incorporated into this SAI by
               reference to the Fund's Annual Report dated October 31, 1998.
    
 
DOCUMENTS INCORPORATED BY REFERENCE TO THE ANNUAL REPORT:
 
               Schedule of Investments as of October 31, 1998
 
               Statement of Operations for the period ended October 31, 1998
 
               Statement of Assets and Liabilities as of October 31, 1998
 
               Statements of Changes in Net Assets for the periods ended October
               31, 1998 and 1997
 
               Financial Highlights for each of the periods indicated
 
               Notes to Financial Statements
 
               Report of Independent Accountants
 
               The portions of such Annual Report that are not specifically
               listed above are not incorporated by reference into this SAI and
               are not part of the Registration Statement.
 
                                                                              67
<PAGE> 
Appendix A
 
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>
 
 68
<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>
 
                                                                              69
<PAGE> 
 
               Unrated securities will be treated as noninvestment grade
               securities unless the portfolio managers determine 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.
 
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<PAGE> 
 
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<PAGE> 
 
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<PAGE> 
 
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<PAGE> 
 
  [JANUS LOGO]
                1-800-525-3713
                P.O. Box 173375
                Denver, Colorado 80217-3375
                janus.com
 
  3173
<PAGE> 
 
                                                     [JANUS LOGO]
 
                    Janus Investment Fund
                    Janus Overseas Fund
 
                    100 Fillmore Street
                    Denver, CO 80206-4928
                    (800) 525-3713
 
                    Statement of Additional Information
 
                    February 17, 1999
 
                    Janus Overseas Fund is a no-load, diversified mutual fund
                    that seeks long-term growth of capital. It invests
                    primarily in common stocks of issuers located outside the
                    United States. The Fund has the flexibility to invest on
                    a worldwide basis in companies and other organizations of
                    any size, regardless of country of organization or place
                    of principal business activity. The Fund 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 Fund 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.
 
                    The Fund is a separate series of Janus Investment Fund, a
                    Massachusetts business trust.
 
                    The Fund has discontinued public sales of its shares to
                    new investors. However, shareholders who maintain open
                    Fund accounts are permitted to continue to purchase
                    shares of the Fund and to reinvest any dividends and/or
                    capital gains distributions in shares of the Fund. Once a
                    shareholder's Fund account is closed, it may not be
                    possible for that shareholder to purchase additional Fund
                    shares. See the "Shareholder's Manual" section of the
                    Prospectus for more details. The Fund may resume sales of
                    its shares at some future date, although it has no
                    present intention of doing so.
 
                    This Statement of Additional Information is not a
                    Prospectus and should be read in conjunction with the
                    Fund's Prospectus dated February 17, 1999, which is
                    incorporated by reference into this SAI and may be
                    obtained from the Trust at the above phone number or
                    address. This SAI contains additional and more detailed
                    information about the Fund's operations and activities
                    than the Prospectus. The Annual Report, which contains
                    important financial information about the Fund, is
                    incorporated by reference into this SAI and is also
                    available, without charge, at the above phone number or
                    address.
<PAGE> 
 
  [JANUS  LOGO]
<PAGE> 
 
                                                             Table of contents
 
<TABLE>
                <S>                                               <C>
                Classification, Portfolio Turnover, Investment
                Policies and Restrictions, and Investment
                Strategies and Risks............................    2
                Investment Adviser..............................   37
                Custodian, Transfer Agent
                and Certain Affiliations........................   41
                Portfolio Transactions and Brokerage............   43
                Trustees and Officers...........................   47
                Purchase of Shares..............................   52
                   Net Asset Value Determination................   52
                   Reinvestment of Dividends and Distributions..   53
                Redemption of Shares............................   55
                Shareholder Accounts............................   56
                   Telephone Transactions.......................   56
                   Systematic Redemptions.......................   56
                Tax-Deferred Accounts...........................   57
                Income Dividends, Capital Gains Distributions
                and Tax Status..................................   59
                Principal Shareholders..........................   60
                Miscellaneous Information.......................   61
                   Shares of the Trust..........................   61
                   Shareholder Meetings.........................   62
                   Voting Rights................................   62
                   Master/Feeder Option.........................   63
                   Independent Accountants......................   63
                   Registration Statement.......................   63
                Performance Information.........................   64
                Financial Statements............................   66
                Appendix A......................................   67
</TABLE>
 
                                                                               1
<PAGE> 
Classification, portfolio turnover, 
                investment policies 
                and restrictions, and 
                investment strategies 
                and risks
 
CLASSIFICATION
 
   
               The Fund is a series of the Trust, an open-end, management
               investment company. The Investment Company Act of 1940 ("1940
               Act") classifies mutual funds as either diversified or
               nondiversified, and the Fund is a diversified fund.
    
 
PORTFOLIO TURNOVER
 
   
               The Prospectus includes a discussion of portfolio turnover
               policies. The Fund's portfolio turnover rates (total purchases or
               sales, whichever is less, compared to average monthly value of
               portfolio securities) for the fiscal years ended October 31, 1998
               and October 31, 1997, were 105% and 72%%, respectively.
    
 
INVESTMENT POLICIES AND RESTRICTIONS
 
               The Fund is subject to certain fundamental policies and
               restrictions that may not be changed without shareholder
               approval. Shareholder approval means approval by the lesser of
               (i) more than 50% of the outstanding voting securities of the
               Trust (or the Fund if a matter affects just the Fund), or (ii)
               67% or more of the voting securities present at a meeting if the
               holders of more than 50% of the outstanding voting securities of
               the Trust (or the Fund) are present or represented by proxy. As
               fundamental policies, the Fund may not:
 
               (1) Own more than 10% of the outstanding voting securities of any
               one issuer and, as to seventy-five percent (75%) of the value of
               its total assets, purchase the securities of any one issuer
               (except cash items and "government securities" as defined under
               the 1940 Act), if immediately after and as a result of such
               purchase, the value of the holdings of the Fund in the securities
               of such issuer exceeds 5% of the value of the Fund's total
               assets.
 
 2
<PAGE> 
 
               (2) Invest 25% or more of the value of its total assets in any
               particular industry (other than U.S. government securities).
 
               (3) Invest directly in real estate or interests in real estate;
               however, the Fund may own debt or equity securities issued by
               companies engaged in those businesses.
 
               (4) Purchase or sell physical commodities other than foreign
               currencies unless acquired as a result of ownership of securities
               (but this limitation shall not prevent the Fund from purchasing
               or selling options, futures, swaps and forward contracts or from
               investing in securities or other instruments backed by physical
               commodities).
 
               (5) Lend any security or make any other loan if, as a result,
               more than 25% of its total assets would be lent to other parties
               (but this limitation does not apply to purchases of commercial
               paper, debt securities or repurchase agreements).
 
               (6) Act as an underwriter of securities issued by others, except
               to the extent that the Fund may be deemed an underwriter in
               connection with the disposition of portfolio securities of the
               Fund.
 
               As a fundamental policy, the Fund may, notwithstanding any other
               investment policy or limitation (whether or not fundamental),
               invest all of its assets in the securities of a single open-end
               management investment company with substantially the same
               fundamental investment objective, policies and limitations as the
               Fund.
 
               The Trustees have adopted additional investment restrictions for
               the Fund. These restrictions are operating policies of the Fund
               and may be changed by the Trustees without shareholder approval.
               The additional investment restrictions adopted by the Trustees to
               date include the following:
 
               (a) The Fund will not (i) enter into any futures contracts and
               related options for purposes other than bona fide hedging
               transactions within the meaning of Commodity Futures Trading
               Commission ("CFTC") regulations if the aggregate initial margin
 
                                                                               3
<PAGE> 
 
               and premiums required to establish positions in futures contracts
               and related options that do not fall within the definition of
               bona fide hedging transactions will exceed 5% of the fair market
               value of the Fund's net assets, after taking into account
               unrealized profits and unrealized losses on any such contracts it
               has entered into; and (ii) enter into any futures contracts if
               the aggregate amount of the Fund's commitments under outstanding
               futures contracts positions would exceed the market value of its
               total assets.
 
               (b) The Fund does not currently intend to sell securities short,
               unless it owns or has the right to obtain securities equivalent
               in kind and amount to the securities sold short without the
               payment of any additional consideration therefor, and provided
               that transactions in futures, options, swaps and forward
               contracts are not deemed to constitute selling securities short.
 
               (c) The Fund does not currently intend to purchase securities on
               margin, except that the Fund may obtain such short-term credits
               as are necessary for the clearance of transactions, and provided
               that margin payments and other deposits in connection with
               transactions in futures, options, swaps and forward contracts
               shall not be deemed to constitute purchasing securities on
               margin.
 
               (d) The Fund may not mortgage or pledge any securities owned or
               held by the Fund in amounts that exceed, in the aggregate, 15% of
               the Fund's net asset value, provided that this limitation does
               not apply to reverse repurchase agreements, deposits of assets to
               margin, guarantee positions in futures, options, swaps or forward
               contracts, or the segregation of assets in connection with such
               contracts.
 
               (e) The Fund may borrow money for temporary or emergency purposes
               (not for leveraging or investment) in an amount not exceeding 25%
               of the value of its total assets (including the amount borrowed)
               less liabilities (other than borrowings). If borrowings exceed
               25% of the value of the Fund's total assets by reason of a
               decline in net assets, the Fund will reduce its borrowings within
               three business days to the extent necessary to comply with the
               25% limitation. This policy shall not prohibit
 
 4
<PAGE> 
 
               reverse repurchase agreements, deposits of assets to margin or
               guarantee positions in futures, options, swaps or forward
               contracts, or the segregation of assets in connection with such
               contracts.
 
               (f) The Fund does not currently intend to purchase any security
               or enter into a repurchase agreement if, as a result, more than
               15% of its net assets would be invested in repurchase agreements
               not entitling the holder to payment of principal and interest
               within seven days and in securities that are illiquid by virtue
               of legal or contractual restrictions on resale or the absence of
               a readily available market. The Trustees, or the Fund's
               investment adviser acting pursuant to authority delegated by the
               Trustees, may determine that a readily available market exists
               for securities eligible for resale pursuant to Rule 144A under
               the Securities Act of 1933 ("Rule 144A Securities"), or any
               successor to such rule, Section 4(2) commercial paper and
               municipal lease obligations. Accordingly, such securities may not
               be subject to the foregoing limitation.
 
               (g) The Fund may not invest in companies for the purpose of
               exercising control of management.
 
               Under the terms of an exemptive order received from the
               Securities and Exchange Commission ("SEC") the Fund may borrow
               money from or lend money to other funds that permit such
               transactions and for which Janus Capital serves as investment
               adviser. All such borrowing and lending will be subject to the
               above limits. The Fund will borrow money through the program only
               when the costs are equal to or lower than the cost of bank loans.
               Interfund loans and borrowings normally extend overnight, but can
               have maximum duration of seven days. The Fund will lend through
               the program only when the returns are higher than those available
               from other short-term instruments (such as repurchase
               agreements). The Fund may have to borrow from a bank at a higher
               interest rate if an interfund loan is called or not renewed. Any
               delay in repayment to a lending Fund could result in a lost
               investment opportunity or additional borrowing costs.
 
                                                                               5
<PAGE> 
 
               For the purposes of the Fund's policies on investing in
               particular industries, the Fund will rely primarily on industry
               or industry group classifications published by Bloomberg L.P. To
               the extent that Bloomberg L.P. industry classifications are so
               broad that the primary economic characteristics in a single
               industry are materially different, the Fund may further classify
               issuers in accordance with industry classifications as published
               by the SEC.
 
INVESTMENT STRATEGIES AND RISKS
 
Cash Position
 
               As discussed in the Prospectus, when the Fund's portfolio
               managers believe that market conditions are unfavorable for
               profitable investing, or when they are otherwise unable to locate
               attractive investment opportunities, the Fund's investment in
               cash and similar investments may increase. Securities that the
               Fund may invest in as a means of receiving a return on idle cash
               include commercial paper, certificates of deposit, repurchase
               agreements or other short-term debt obligations. The Fund may
               also invest in money market funds, including funds managed by
               Janus Capital. (See "Investment Company Securities" on page 11).
 
Illiquid Investments
 
               The Fund may invest up to 15% of its net assets in illiquid
               investments (i.e., securities that are not readily marketable).
               The Trustees have authorized Janus Capital to make liquidity
               determinations with respect to certain securities, including Rule
               144A Securities, commercial paper and municipal lease obligations
               purchased by the Fund. Under the guidelines established by the
               Trustees, Janus Capital will consider the following factors: 1)
               the frequency of trades and quoted prices for the obligation; 2)
               the number of dealers willing to purchase or sell the security
               and the number of other potential purchasers; 3) the willingness
               of dealers to undertake to make a market in the security; and 4)
               the nature of the security and the nature of marketplace trades,
               including the time needed to dispose of the security, the method
               of soliciting offers and the mechanics of the
 
 6
<PAGE> 
 
               transfer. In the case of commercial paper, Janus Capital will
               also consider whether the paper is traded flat or in default as
               to principal and interest and any ratings of the paper by a
               Nationally Recognized Statistical Rating Organization ("NRSRO").
               A foreign security that may be freely traded on or through the
               facilities of an offshore exchange or other established offshore
               securities market is not deemed to be a restricted security
               subject to these procedures.
 
               If illiquid securities exceed 15% of the Fund's net assets after
               the time of purchase the Fund will take steps to reduce in an
               orderly fashion its holdings of illiquid securities. Because
               illiquid securities may not be readily marketable, the portfolio
               managers may not be able to dispose of them in a timely manner.
               As a result, the Fund may be forced to hold illiquid securities
               while their price depreciates. Depreciation in the price of
               illiquid securities may cause the net asset value of the Fund to
               decline.
 
Short Sales
 
               The Fund may engage in "short sales against the box." This
               technique involves selling either a security that the Fund owns,
               or a security equivalent in kind and amount to the security sold
               short that the Fund has the right to obtain, for delivery at a
               specified date in the future. The Fund may enter into a short
               sale against the box to hedge against anticipated declines in the
               market price of portfolio securities. If the value of the
               securities sold short increases prior to the scheduled delivery
               date, the Fund loses the opportunity to participate in the gain.
 
Zero Coupon, Step Coupon and Pay-In-Kind Securities
 
               The Fund may invest up to 10% of its assets in zero coupon, pay-
               in-kind and step coupon securities. Zero coupon bonds are issued
               and traded at a discount from their face value. They do not
               entitle the holder to any periodic payment of interest prior to
               maturity. Step coupon bonds trade at a discount from their face
               value and pay coupon interest. The coupon rate is low for an
               initial period and then increases to a higher coupon rate
               thereafter. The
 
                                                                               7
<PAGE> 
 
               discount from the face amount or par 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. Pay-in-kind bonds 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.
 
               Current federal income tax law requires holders of zero coupon
               and step coupon securities to report the portion of the original
               issue discount on such securities that accrues during a given
               year as interest income, even though the holders receive no cash
               payments of interest during the year. In order to qualify as a
               "regulated investment company" under the Internal Revenue Code of
               1986 and the regulations thereunder (the "Code"), the Fund must
               distribute its investment company taxable income, including the
               original issue discount accrued on zero coupon or step coupon
               bonds. Because the Fund will not receive cash payments on a
               current basis in respect of accrued original issue discount on
               zero coupon bonds or step coupon bonds during the period before
               interest payments begin, in some years the Fund may have to
               distribute cash obtained from other sources in order to satisfy
               the distribution requirements under the Code. The Fund might
               obtain such cash from selling other portfolio holdings which
               might cause the Fund to incur capital gains or losses on the
               sale. Additionally, these actions are likely to reduce the assets
               to which Fund expenses could be allocated and to reduce the rate
               of return for the Fund. In some circumstances, such sales might
               be necessary in order to satisfy cash distribution requirements
               even though investment considerations might otherwise make it
               undesirable for the Fund to sell the securities at the time.
 
               Generally, the market prices of zero coupon, step coupon and
               pay-in-kind securities are more volatile than the prices of
               securities that pay interest periodically and in cash and are
               likely to respond to changes in interest rates to a greater
               degree than other types of debt securities having similar
               maturities and credit quality.
 
 8
<PAGE> 
 
Pass-Through Securities
 
               The Fund may invest in various types of pass-through securities,
               such as mortgage-backed securities, asset-backed securities and
               participation interests. A pass-through security is a share or
               certificate of interest in a pool of debt obligations that have
               been repackaged by an intermediary, such as a bank or
               broker-dealer. The purchaser of a pass-through security receives
               an undivided interest in the underlying pool of securities. The
               issuers of the underlying securities make interest and principal
               payments to the intermediary which are passed through to
               purchasers, such as the Fund. The most common type of
               pass-through securities are mortgage-backed securities.
               Government National Mortgage Association ("GNMA") Certificates
               are mortgage-backed securities that evidence an undivided
               interest in a pool of mortgage loans. GNMA Certificates differ
               from bonds in that principal is paid back monthly by the
               borrowers over the term of the loan rather than returned in a
               lump sum at maturity. The Fund will generally purchase "modified
               pass-through" GNMA Certificates, which entitle the holder to
               receive a share of all interest and principal payments paid and
               owned on the mortgage pool, net of fees paid to the "issuer" and
               GNMA, regardless of whether or not the mortgagor actually makes
               the payment. GNMA Certificates are backed as to the timely
               payment of principal and interest by the full faith and credit of
               the U.S. government.
 
               The Federal Home Loan Mortgage Corporation ("FHLMC") issues two
               types of mortgage pass-through securities: mortgage participation
               certificates ("PCs") and guaranteed mortgage certificates
               ("GMCs"). PCs resemble GNMA Certificates in that each PC
               represents a pro rata share of all interest and principal
               payments made and owned on the underlying pool. FHLMC guarantees
               timely payments of interest on PCs and the full return of
               principal. GMCs also represent a pro rata interest in a pool of
               mortgages. However, these instruments pay interest semiannually
               and return principal once a year in guaranteed minimum payments.
               This type of security is guaranteed by FHLMC as to
 
                                                                               9
<PAGE> 
 
               timely payment of principal and interest but it is not guaranteed
               by the full faith and credit of the U.S. government.
 
               The Federal National Mortgage Association ("FNMA") issues
               guaranteed mortgage pass-through certificates ("FNMA
               Certificates"). FNMA Certificates resemble GNMA Certificates in
               that each FNMA Certificate represents a pro rata share of all
               interest and principal payments made and owned on the underlying
               pool. This type of security is guaranteed by FNMA as to timely
               payment of principal and interest but it is not guaranteed by the
               full faith and credit of the U.S. government.
 
               Except for GMCs, each of the mortgage-backed securities described
               above is characterized by monthly payments to the holder,
               reflecting the monthly payments made by the borrowers who
               received the underlying mortgage loans. The payments to the
               security holders (such as the Fund), like the payments on the
               underlying loans, represent both principal and interest. Although
               the underlying mortgage loans are for specified periods of time,
               such as 20 or 30 years, the borrowers can, and typically do, pay
               them off sooner. Thus, the security holders frequently receive
               prepayments of principal in addition to the principal that is
               part of the regular monthly payments. The Fund's portfolio
               managers will consider estimated prepayment rates in calculating
               the average weighted maturity of the Fund. A borrower is more
               likely to prepay a mortgage that bears a relatively high rate of
               interest. This means that in times of declining interest rates,
               higher yielding mortgage-backed securities held by the Fund might
               be converted to cash and the Fund will be forced to accept lower
               interest rates when that cash is used to purchase additional
               securities in the mortgage-backed securities sector or in other
               investment sectors. Additionally, prepayments during such periods
               will limit the Fund's ability to participate in as large a market
               gain as may be experienced with a comparable security not subject
               to prepayment.
 
               Asset-backed securities represent interests in pools of consumer
               loans and are backed by paper or accounts receivables originated
               by banks, credit card companies or other providers of credit.
 
 10
<PAGE> 
 
               Generally, the originating bank or credit provider is neither the
               obligor nor the guarantor of the security, and interest and
               principal payments ultimately depend upon payment of the
               underlying loans by individuals. Tax-exempt asset-backed
               securities include units of beneficial interests in pools of
               purchase contracts, financing leases, and sales agreements that
               may be created when a municipality enters into an installment
               purchase contract or lease with a vendor. Such securities may be
               secured by the assets purchased or leased by the municipality;
               however, if the municipality stops making payments, there
               generally will be no recourse against the vendor. These
               obligations are likely to involve unscheduled prepayments of
               principal.
 
Investment Company Securities
 
               From time to time, the Fund may invest in securities of other
               investment companies, subject to the provisions of Section
               12(d)(1) of the 1940 Act. The Fund may invest in securities of
               money market funds managed by Janus Capital in excess of the
               limitations of Section 12(d)(1) under the terms of an SEC
               exemptive order obtained by Janus Capital and the Janus funds.
 
Depositary Receipts
 
               The Fund may invest in sponsored and unsponsored American
               Depositary Receipts ("ADRs"), which are receipts issued by an
               American bank or trust company evidencing ownership of underlying
               securities issued by a foreign issuer. ADRs, in registered form,
               are designed for use in U.S. securities markets. Unsponsored ADRs
               may be created without the participation of the foreign issuer.
               Holders of these ADRs generally bear all the costs of the ADR
               facility, whereas foreign issuers typically bear certain costs in
               a sponsored ADR. The bank or trust company depositary of an
               unsponsored ADR may be under no obligation to distribute
               shareholder communications received from the foreign issuer or to
               pass through voting rights. The Fund may also invest in European
               Depositary Receipts ("EDRs"), Global Depositary Receipts ("GDRs")
               and in other similar instruments representing
 
                                                                              11
<PAGE> 
 
               securities of foreign companies. EDRs are receipts issued by a
               European financial institution evidencing an arrangement similar
               to that of ADRs. EDRs, in bearer form, are designed for use in
               European securities markets.
 
               Depositary Receipts are generally subject to the same sort of
               risks as direct investments in a foreign country, such as,
               currency risk, political and economic risk, and market risk,
               because their values depend on the performance of a foreign
               security denominated in its home currency. The risks of foreign
               investing are addressed in some detail in the Fund's prospectus.
 
Municipal Obligations
 
               The Fund may invest in municipal obligations issued by states,
               territories and possessions of the United States and the District
               of Columbia. The value of municipal obligations can be affected
               by changes in their actual or perceived credit quality. The
               credit quality of municipal obligations can be affected by, among
               other things the financial condition of the issuer or guarantor,
               the issuer's future borrowing plans and sources of revenue, the
               economic feasibility of the revenue bond project or general
               borrowing purpose, political or economic developments in the
               region where the security is issued, and the liquidity of the
               security. Because municipal securities are generally traded over-
               the-counter, the liquidity of a particular issue often depends on
               the willingness of dealers to make a market in the security. The
               liquidity of some municipal obligations may be enhanced by demand
               features, which would enable the Fund to demand payment on short
               notice from the issuer or a financial intermediary.
 
Other Income-Producing Securities
 
               Other types of income producing securities that the Fund may
               purchase include, but are not limited to, the following types of
               securities:
 
               VARIABLE AND FLOATING RATE OBLIGATIONS. These types of securities
               have variable or floating rates of interest and, under certain
               limited circumstances, may have varying principal amounts. These
 
 12
<PAGE> 
 
               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. These types of securities have variable or
               floating rates of interest and, under certain limited
               circumstances, may have varying principal amounts. Variable and
               floating rate 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 "underlying index"). See also "Inverse Floaters."
 
               In order to most effectively use these investments, the portfolio
               managers must correctly assess probable movements in interest
               rates. This involves different skills than those used to select
               most portfolio securities. If the portfolio managers incorrectly
               forecasts such movements, the Fund could be adversely affected by
               the use of variable or floating rate obligations.
 
               STANDBY COMMITMENTS. These instruments, which are similar to a
               put, give the Fund the option to obligate a broker, dealer or
               bank to repurchase a security held by the Fund at a specified
               price.
 
               TENDER OPTION BONDS. Tender option bonds are generally long-term
               securities that are coupled with the 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.
 
               INVERSE FLOATERS. Inverse floaters are debt instruments whose
               interest bears an inverse relationship to the interest rate on
               another security. The Fund will not invest more than 5% of its
               assets in inverse floaters. Similar to variable and floating rate
               obligations, effective use of inverse floaters requires skills
               different from those needed to select most portfolio securities.
               If movements in interest rates are incorrectly anticipated, the
               Fund could lose money or its NAV could decline by the use of
               inverse floaters.
 
                                                                              13
<PAGE> 
 
               STRIP BONDS. 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.
 
               The Fund will purchase standby commitments, tender option bonds
               and instruments with demand features primarily for the purpose of
               increasing the liquidity of its portfolio.
 
High-Yield/High-Risk Securities
 
               The Fund intends to invest less than 35% of its net assets in
               securities that are rated below investment grade (e.g.,
               securities rated BB or lower by Standard & Poor's Ratings
               Services or Ba or lower by Moody's Investors Service, Inc.).
               Lower rated securities involve a higher degree of credit risk,
               which is the risk that the issuer will not make interest or
               principal payments when due. In the event of an unanticipated
               default, the Fund would experience a reduction in its income, and
               could expect a decline in the market value of the securities so
               affected.
 
               The Fund may also invest in unrated debt securities of foreign
               and domestic issuers. Unrated debt, while not necessarily of
               lower quality than rated securities, may not have as broad a
               market. Sovereign debt of foreign governments is generally rated
               by country. Because these ratings do not take into account
               individual factors relevant to each issue and may not be updated
               regularly, Janus Capital may treat such securities as unrated
               debt. Because of the size and perceived demand of the issue,
               among other factors, certain municipalities may not incur the
               costs of obtaining a rating. The Fund's portfolio managers will
               analyze the creditworthiness of the issuer, as well as any
               financial institution or other party responsible for payments on
               the security, in determining whether to purchase unrated
               municipal bonds. Unrated debt securities will be included in the
               35% limit unless the portfolio managers deem such securities to
               be the equivalent of investment grade securities.
 
 14
<PAGE> 
 
               Subject to the above limits, the Fund may purchase defaulted
               securities only when its portfolio managers believe, based upon
               their analysis of the financial condition, results of operations
               and economic outlook of an issuer, that there is potential for
               resumption of income payments and that the securities offer an
               unusual opportunity for capital appreciation. Notwithstanding the
               portfolio managers' belief about the resumption of income,
               however, the purchase of any security on which payment of
               interest or dividends is suspended involves a high degree of
               risk. Such risk includes, among other things, the following:
 
               Financial and Market Risks. Investments in securities that are in
               default involve a high degree of financial and market risks that
               can result in substantial or, at times, even total losses.
               Issuers of defaulted securities may have substantial capital
               needs and may become involved in bankruptcy or reorganization
               proceedings. Among the problems involved in investments in such
               issuers is the fact that it may be difficult to obtain
               information about the condition of such issuers. The market
               prices of such securities also are subject to abrupt and erratic
               movements and above average price volatility, and the spread
               between the bid and asked prices of such securities may be
               greater than normally expected.
 
               Disposition of Portfolio Securities. Although the Fund generally
               will purchase securities for which its portfolio managers expect
               an active market to be maintained, defaulted securities may be
               less actively traded than other securities and it may be
               difficult to dispose of substantial holdings of such securities
               at prevailing market prices. The Fund will limit holdings of any
               such securities to amounts that the portfolio managers believe
               could be readily sold, and holdings of such securities would, in
               any event, be limited so as not to limit the Fund's ability to
               readily dispose of securities to meet redemptions.
 
               Other. Defaulted securities require active monitoring and may, at
               times, require participation in bankruptcy or receivership
               proceedings on behalf of the Fund.
 
                                                                              15
<PAGE> 
 
Repurchase and Reverse Repurchase Agreements
 
               In a repurchase agreement, the Fund purchases a security and
               simultaneously commits to resell that security to the seller at
               an agreed upon price on an agreed upon date within a number of
               days (usually not more than seven) from the date of purchase. The
               resale price consists of the purchase price plus an agreed upon
               incremental amount that is unrelated to the coupon rate or
               maturity of the purchased security. A repurchase agreement
               involves the obligation of the seller to pay the agreed upon
               price, which obligation is in effect secured by the value (at
               least equal to the amount of the agreed upon resale price and
               marked-to-market daily) of the underlying security or
               "collateral." A risk associated with repurchase agreements is the
               failure of the seller to repurchase the securities as agreed,
               which may cause the Fund to suffer a loss if the market value of
               such securities declines before they can be liquidated on the
               open market. In the event of bankruptcy or insolvency of the
               seller, the Fund may encounter delays and incur costs in
               liquidating the underlying security. Repurchase agreements that
               mature in more than seven days are subject to the 15% limit on
               illiquid investments. While it is possible to eliminate all risks
               from these transactions, it is the policy of the Fund to limit
               repurchase agreements to those parties whose creditworthiness has
               been reviewed and found satisfactory by Janus Capital.
 
               The Fund may use reverse repurchase agreements to obtain cash to
               satisfy unusually heavy redemption requests or for other
               temporary or emergency purposes without the necessity of selling
               portfolio securities or to earn additional income on portfolio
               securities, such as Treasury bills or notes. In a reverse
               repurchase agreement, the Fund sells a portfolio security to
               another party, such as a bank or broker-dealer, in return for
               cash and agrees to repurchase the instrument at a particular
               price and time. While a reverse repurchase agreement is
               outstanding, the Fund will maintain cash and appropriate liquid
               assets in a segregated custodial account to cover its obligation
               under the agreement. The Fund will enter into reverse repurchase
               agreements only with parties that Janus Capital deems
               creditworthy. Using reverse
 
 16
<PAGE> 
 
               repurchase agreements to earn additional income involves the risk
               that the interest earned on the invested proceeds is less than
               the expense of the reverse repurchase agreement transaction. This
               technique may also have a leveraging effect on the Fund's
               portfolio, although the Fund's intent to segregate assets in the
               amount of the reverse repurchase agreement minimizes this effect.
 
Futures, Options and Other Derivative Instruments
 
               FUTURES CONTRACTS. The Fund may enter into contracts for the
               purchase or sale for future delivery of fixed-income securities,
               foreign currencies or contracts based on financial indices,
               including indices of U.S. government securities, foreign
               government securities, equity or fixed-income securities. U.S.
               futures contracts are traded on exchanges which have been
               designated "contract markets" by the CFTC and must be executed
               through a futures commission merchant ("FCM"), or brokerage firm,
               which is a member of the relevant contract market. Through their
               clearing corporations, the exchanges guarantee performance of the
               contracts as between the clearing members of the exchange.
 
               The buyer or seller of a futures contract is not required to
               deliver or pay for the underlying instrument unless the contract
               is held until the delivery date. However, both the buyer and
               seller are required to deposit "initial margin" for the benefit
               of the FCM when the contract is entered into. Initial margin
               deposits are equal to a percentage of the contract's value, as
               set by the exchange on which the contract is traded, and may be
               maintained in cash or certain other liquid assets by the Fund's
               custodian for the benefit of the FCM. Initial margin payments are
               similar to good faith deposits or performance bonds. Unlike
               margin extended by a securities broker, initial margin payments
               do not constitute purchasing securities on margin for purposes of
               the Fund's investment limitations. If the value of either party's
               position declines, that party will be required to make additional
               "variation margin" payments for the benefit of the FCM to settle
               the change in value on a daily basis. The party that has a gain
               may be entitled to receive all or a portion of this amount. In
               the event of
 
                                                                              17
<PAGE> 
 
               the bankruptcy of the FCM that holds margin on behalf of the
               Fund, the Fund may be entitled to a return of margin owed to the
               Fund only in proportion to the amount received by the FCM's other
               customers. Janus Capital will attempt to minimize the risk by
               careful monitoring of the creditworthiness of the FCMs with which
               the Fund does business and by depositing margin payments in a
               segregated account with the Fund's custodian.
 
               The Fund intends to comply with guidelines of eligibility for
               exclusion from the definition of the term "commodity pool
               operator" adopted by the CFTC and the National Futures
               Association, which regulate trading in the futures markets. The
               Fund will use futures contracts and related options primarily for
               bona fide hedging purposes within the meaning of CFTC
               regulations. To the extent that the Fund holds positions in
               futures contracts and related options that do not fall within the
               definition of bona fide hedging transactions, the aggregate
               initial margin and premiums required to establish such positions
               will not exceed 5% of the fair market value of the Fund's net
               assets, after taking into account unrealized profits and
               unrealized losses on any such contracts it has entered into.
 
               Although the Fund will segregate cash and liquid assets in an
               amount sufficient to cover its open futures obligations, the
               segregated assets would be available to the Fund immediately upon
               closing out the futures position, while settlement of securities
               transactions could take several days. However, because the Fund's
               cash that may otherwise be invested would be held uninvested or
               invested in other liquid assets so long as the futures position
               remains open, the Fund's return could be diminished due to the
               opportunity losses of foregoing other potential investments.
 
               The Fund's primary purpose in entering into futures contracts is
               to protect the Fund from fluctuations in the value of securities
               or interest rates without actually buying or selling the
               underlying debt or equity security. For example, if the Fund
               anticipates an increase in the price of stocks, and it intends to
               purchase stocks at a later time, the Fund could enter into a
               futures contract to purchase a stock index as a temporary
               substitute for stock
 
 18
<PAGE> 
 
               purchases. If an increase in the market occurs that influences
               the stock index as anticipated, the value of the futures
               contracts will increase, thereby serving as a hedge against the
               Fund not participating in a market advance. This technique is
               sometimes known as an anticipatory hedge. To the extent the Fund
               enters into futures contracts for this purpose, the segregated
               assets maintained to cover the Fund's obligations with respect to
               the futures contracts will consist of other liquid assets from
               its portfolio in an amount equal to the difference between the
               contract price and the aggregate value of the initial and
               variation margin payments made by the Fund with respect to the
               futures contracts. Conversely, if the Fund holds stocks and seeks
               to protect itself from a decrease in stock prices, the Fund might
               sell stock index futures contracts, thereby hoping to offset the
               potential decline in the value of its portfolio securities by a
               corresponding increase in the value of the futures contract
               position. The Fund could protect against a decline in stock
               prices by selling portfolio securities and investing in money
               market instruments, but the use of futures contracts enables it
               to maintain a defensive position without having to sell portfolio
               securities.
 
               If the Fund owns Treasury bonds and the portfolio managers expect
               interest rates to increase, the Fund may take a short position in
               interest rate futures contracts. Taking such a position would
               have much the same effect as the Fund selling Treasury bonds in
               its portfolio. If interest rates increase as anticipated, the
               value of the Treasury bonds would decline, but the value of the
               Fund's interest rate futures contract will increase, thereby
               keeping the net asset value of the Fund from declining as much as
               it may have otherwise. If, on the other hand, the portfolio
               managers expect interest rates to decline, the Fund may take a
               long position in interest rate futures contracts in anticipation
               of later closing out the futures position and purchasing bonds.
               Although the Fund can accomplish similar results by buying
               securities with long maturities and selling securities with short
               maturities, given the greater liquidity of the futures market
               than the cash market, it may be possible to accomplish the same
               result more easily and
 
                                                                              19
<PAGE> 
 
               more quickly by using futures contracts as an investment tool to
               reduce risk.
 
               The ordinary spreads between prices in the cash and futures
               markets, due to differences in the nature of those markets, are
               subject to distortions. First, all participants in the futures
               market are subject to initial margin and variation margin
               requirements. Rather than meeting additional variation margin
               requirements, investors may close out futures contracts through
               offsetting transactions which could distort the normal price
               relationship between the cash and futures markets. Second, the
               liquidity of the futures market depends on participants entering
               into offsetting transactions rather than making or taking
               delivery of the instrument underlying a futures contract. To the
               extent participants decide to make or take delivery, liquidity in
               the futures market could be reduced and prices in the futures
               market distorted. Third, from the point of view of speculators,
               the margin deposit requirements in the futures market are less
               onerous than margin requirements in the securities market.
               Therefore, increased participation by speculators in the futures
               market may cause temporary price distortions. Due to the
               possibility of the foregoing distortions, a correct forecast of
               general price trends by the portfolio managers still may not
               result in a successful use of futures.
 
               Futures contracts entail risks. Although the Fund believes that
               use of such contracts will benefit the Fund, the Fund's overall
               performance could be worse than if the Fund had not entered into
               futures contracts if the portfolio managers' investment judgement
               proves incorrect. For example, if the Fund has hedged against the
               effects of a possible decrease in prices of securities held in
               its portfolio and prices increase instead, the Fund will lose
               part or all of the benefit of the increased value of these
               securities because of offsetting losses in its futures positions.
               In addition, if the Fund has insufficient cash, it may have to
               sell securities from its portfolio to meet daily variation margin
               requirements. Those sales may be, but will not necessarily be, at
               increased prices which reflect the rising market and may occur at
               a time when the sales are disadvantageous to the Fund.
 
 20
<PAGE> 
 
               The prices of futures contracts depend primarily on the value of
               their underlying instruments. Because there are a limited number
               of types of futures contracts, it is possible that the
               standardized futures contracts available to the Fund will not
               match exactly the Fund's current or potential investments. The
               Fund may buy and sell futures contracts based on underlying
               instruments with different characteristics from the securities in
               which it typically invests D for example, by hedging investments
               in portfolio securities with a futures contract based on a broad
               index of securities D which involves a risk that the futures
               position will not correlate precisely with the performance of the
               Fund's investments.
 
               Futures prices can also diverge from the prices of their
               underlying instruments, even if the underlying instruments
               closely correlate with the Fund's investments. Futures prices are
               affected by factors such as current and anticipated short-term
               interest rates, changes in volatility of the underlying
               instruments and the time remaining until expiration of the
               contract. Those factors may affect securities prices differently
               from futures prices. Imperfect correlations between the Fund's
               investments and its futures positions also may result from
               differing levels of demand in the futures markets and the
               securities markets, from structural differences in how futures
               and securities are traded, and from imposition of daily price
               fluctuation limits for futures contracts. The Fund may buy or
               sell futures contracts with a greater or lesser value than the
               securities it wishes to hedge or is considering purchasing in
               order to attempt to compensate for differences in historical
               volatility between the futures contract and the securities,
               although this may not be successful in all cases. If price
               changes in the Fund's futures positions are poorly correlated
               with its other investments, its futures positions may fail to
               produce desired gains or result in losses that are not offset by
               the gains in the Fund's other investments.
 
               Because futures contracts are generally settled within a day from
               the date they are closed out, compared with a settlement period
               of three days for some types of securities, the futures markets
               can
 
                                                                              21
<PAGE> 
 
               provide superior liquidity to the securities markets.
               Nevertheless, there is no assurance that a liquid secondary
               market will exist for any particular futures contract at any
               particular time. In addition, futures exchanges may establish
               daily price fluctuation limits for futures contracts and may halt
               trading if a contract's price moves upward or downward more than
               the limit in a given day. On volatile trading days when the price
               fluctuation limit is reached, it may be impossible for the Fund
               to enter into new positions or close out existing positions. If
               the secondary market for a futures contract is not liquid because
               of price fluctuation limits or otherwise, the Fund may not be
               able to promptly liquidate unfavorable futures positions and
               potentially could be required to continue to hold a futures
               position until the delivery date, regardless of changes in its
               value. As a result, the Fund's access to other assets held to
               cover its futures positions also could be impaired.
 
               OPTIONS ON FUTURES CONTRACTS. The Fund may buy and write put and
               call options on futures contracts. An option on a future gives
               the Fund the right (but not the obligation) to buy or sell a
               futures contract at a specified price on or before a specified
               date. The purchase of a call option on a futures contract is
               similar in some respects to the purchase of a call option on an
               individual security. Depending on the pricing of the option
               compared to either the price of the futures contract upon which
               it is based or the price of the underlying instrument, ownership
               of the option may or may not be less risky than ownership of the
               futures contract or the underlying instrument. As with the
               purchase of futures contracts, when the Fund is not fully
               invested it may buy a call option on a futures contract to hedge
               against a market advance.
 
               The writing of a call option on a futures contract constitutes a
               partial hedge against declining prices of the security or foreign
               currency which is deliverable under, or of the index comprising,
               the futures contract. If the future's price at the expiration of
               the option is below the exercise price, the Fund will retain the
               full amount of the option premium which provides a partial hedge
               against any decline that may have occurred in the Fund's
               portfolio holdings. The writing of a put option on a futures
               contract
 
 22
<PAGE> 
 
               constitutes a partial hedge against increasing prices of the
               security or foreign currency which is deliverable under, or of
               the index comprising, the futures contract. If the futures' price
               at expiration of the option is higher than the exercise price,
               the Fund will retain the full amount of the option premium which
               provides a partial hedge against any increase in the price of
               securities which the Fund is considering buying. If a call or put
               option the Fund has written is exercised, the Fund will incur a
               loss which will be reduced by the amount of the premium it
               received. Depending on the degree of correlation between the
               change in the value of its portfolio securities and changes in
               the value of the futures positions, the Fund's losses from
               existing options on futures may to some extent be reduced or
               increased by changes in the value of portfolio securities.
 
               The purchase of a put option on a futures contract is similar in
               some respects to the purchase of protective put options on
               portfolio securities. For example, the Fund may buy a put option
               on a futures contract to hedge its portfolio against the risk of
               falling prices or rising interest rates.
 
               The amount of risk the Fund assumes when it buys an option on a
               futures contract is the premium paid for the option plus related
               transaction costs. In addition to the correlation risks discussed
               above, the purchase of an option also entails the risk that
               changes in the value of the underlying futures contract will not
               be fully reflected in the value of the options bought.
 
               FORWARD CONTRACTS. A forward contract is an agreement between two
               parties in which one party is obligated to deliver a stated
               amount of a stated asset at a specified time in the future and
               the other party is obligated to pay a specified amount for the
               assets at the time of delivery. The Fund may enter into forward
               contracts to purchase and sell government securities, equity or
               income securities, foreign currencies or other financial
               instruments. Forward contracts generally are traded in an
               interbank market conducted directly between traders (usually
               large commercial banks) and their customers. Unlike futures
               contracts, which are
 
                                                                              23
<PAGE> 
 
               standardized contracts, forward contracts can be specifically
               drawn to meet the needs of the parties that enter into them. The
               parties to a forward contract may agree to offset or terminate
               the contract before its maturity, or may hold the contract to
               maturity and complete the contemplated exchange.
 
               The following discussion summarizes the Fund's principal uses of
               forward foreign currency exchange contracts ("forward currency
               contracts"). The Fund may enter into forward currency contracts
               with stated contract values of up to the value of the Fund's
               assets. A forward currency contract is an obligation to buy or
               sell an amount of a specified currency for an agreed price (which
               may be in U.S. dollars or a foreign currency). The Fund will
               exchange foreign currencies for U.S. dollars and for other
               foreign currencies in the normal course of business and may buy
               and sell currencies through forward currency contracts in order
               to fix a price for securities it has agreed to buy or sell
               ("transaction hedge"). The Fund also may hedge some or all of its
               investments denominated in a foreign currency or exposed to
               foreign currency fluctuations against a decline in the value of
               that currency relative to the U.S. dollar by entering into
               forward currency contracts to sell an amount of that currency (or
               a proxy currency whose performance is expected to replicate or
               exceed the performance of that currency relative to the U.S.
               dollar) approximating the value of some or all of its portfolio
               securities denominated in that currency ("position hedge") or by
               participating in options or futures contracts with respect to the
               currency. The Fund also may enter into a forward currency
               contract with respect to a currency where the Fund is considering
               the purchase or sale of investments denominated in that currency
               but has not yet selected the specific investments ("anticipatory
               hedge"). In any of these circumstances the Fund may,
               alternatively, enter into a forward currency contract to purchase
               or sell one foreign currency for a second currency that is
               expected to perform more favorably relative to the U.S. dollar if
               the portfolio managers believe there is a reasonable degree of
               correlation between movements in the two currencies
               ("cross-hedge").
 
 24
<PAGE> 
 
               These types of hedging minimize the effect of currency
               appreciation as well as depreciation, but do not eliminate
               fluctuations in the underlying U.S. dollar equivalent value of
               the proceeds of or rates of return on the Fund's foreign currency
               denominated portfolio securities. The matching of the increase in
               value of a forward contract and the decline in the U.S. dollar
               equivalent value of the foreign currency denominated asset that
               is the subject of the hedge generally will not be precise.
               Shifting the Fund's currency exposure from one foreign currency
               to another removes the Fund's opportunity to profit from
               increases in the value of the original currency and involves a
               risk of increased losses to the Fund if its portfolio managers'
               projection of future exchange rates is inaccurate. Proxy hedges
               and cross-hedges may result in losses if the currency used to
               hedge does not perform similarly to the currency in which hedged
               securities are denominated. Unforeseen changes in currency prices
               may result in poorer overall performance for the Fund than if it
               had not entered into such contracts.
 
               The Fund will cover outstanding forward currency contracts by
               maintaining liquid portfolio securities denominated in or whose
               value its tied to, the currency underlying the forward contract
               or the currency being hedged. To the extent that the Fund is not
               able to cover its forward currency positions with underlying
               portfolio securities, the Fund's custodian will segregate cash or
               other liquid assets having a value equal to the aggregate amount
               of the Fund's commitments under forward contracts entered into
               with respect to position hedges, cross-hedges and anticipatory
               hedges. If the value of the securities used to cover a position
               or the value of segregated assets declines, the Fund will find
               alternative cover or segregate additional cash or liquid assets
               on a daily basis so that the value of the covered and segregated
               assets will be equal to the amount of the Fund's commitments with
               respect to such contracts. As an alternative to segregating
               assets, the Fund may buy call options permitting the Fund to buy
               the amount of foreign currency being hedged by a forward sale
 
                                                                              25
<PAGE> 
 
               contract or the Fund may buy put options permitting it to sell
               the amount of foreign currency subject to a forward buy contract.
 
               While forward contracts are not currently regulated by the CFTC,
               the CFTC may in the future assert authority to regulate forward
               contacts. In such event, the Fund's ability to utilize forward
               contracts may be restricted. In addition, the Fund may not always
               be able to enter into forward contracts at attractive prices and
               may be limited in its ability to use these contracts to hedge
               Fund assets.
 
               OPTIONS ON FOREIGN CURRENCIES. The Fund may buy and write options
               on foreign currencies in a manner similar to that in which
               futures or forward contracts on foreign currencies will be
               utilized. For example, a decline in the U.S. dollar value of a
               foreign currency in which portfolio securities are denominated
               will reduce the U.S. dollar value of such securities, even if
               their value in the foreign currency remains constant. In order to
               protect against such diminutions in the value of portfolio
               securities, the Fund may buy put options on the foreign currency.
               If the value of the currency declines, the Fund will have the
               right to sell such currency for a fixed amount in U.S. dollars,
               thereby offsetting, in whole or in part, the adverse effect on
               its portfolio.
 
               Conversely, when a rise in the U.S. dollar value of a currency in
               which securities to be acquired are denominated is projected,
               thereby increasing the cost of such securities, the Fund may buy
               call options on the foreign currency. The purchase of such
               options could offset, at least partially, the effects of the
               adverse movements in exchange rates. As in the case of other
               types of options, however, the benefit to the Fund from purchases
               of foreign currency options will be reduced by the amount of the
               premium and related transaction costs. In addition, if currency
               exchange rates do not move in the direction or to the extent
               projected, the Fund could sustain losses on transactions in
               foreign currency options that would require the Fund to forego a
               portion or all of the benefits of advantageous changes in those
               rates.
 
               The Fund may also write options on foreign currencies. For
               example, to hedge against a potential decline in the U.S. dollar
 
 26
<PAGE> 
 
               value of foreign currency denominated securities due to adverse
               fluctuations in exchange rates, the Fund could, instead of
               purchasing a put option, write a call option on the relevant
               currency. If the expected decline occurs, the option will most
               likely not be exercised and the decline in value of portfolio
               securities will be offset by the amount of the premium received.
 
               Similarly, instead of purchasing a call option to hedge against a
               potential increase in the U.S. dollar cost of securities to be
               acquired, the Fund could write a put option on the relevant
               currency which, if rates move in the manner projected, should
               expire unexercised and allow the Fund to hedge the increased cost
               up to the amount of the premium. As in the case of other types of
               options, however, the writing of a foreign currency option will
               constitute only a partial hedge up to the amount of the premium.
               If exchange rates do not move in the expected direction, the
               option may be exercised and the Fund would be required to buy or
               sell the underlying currency at a loss which may not be offset by
               the amount of the premium. Through the writing of options on
               foreign currencies, the Fund also may lose all or a portion of
               the benefits which might otherwise have been obtained from
               favorable movements in exchange rates.
 
               The Fund may write covered call options on foreign currencies. A
               call option written on a foreign currency by the Fund is
               "covered" if the Fund owns the foreign currency underlying the
               call or has an absolute and immediate right to acquire that
               foreign currency without additional cash consideration (or for
               additional cash consideration held in a segregated account by its
               custodian) upon conversion or exchange of other foreign
               currencies held in its portfolio. A call option is also covered
               if the Fund has a call on the same foreign currency in the same
               principal amount as the call written if the exercise price of the
               call held (i) is equal to or less than the exercise price of the
               call written or (ii) is greater than the exercise price of the
               call written, if the difference is maintained by the Fund in cash
               or other liquid assets in a segregated account with the Fund's
               custodian.
 
                                                                              27
<PAGE> 
 
               The Fund also may write call options on foreign currencies for
               cross-hedging purposes. A call option on a foreign currency is
               for cross-hedging purposes if it is designed to provide a hedge
               against a decline due to an adverse change in the exchange rate
               in the U.S. dollar value of a security which the Fund owns or has
               the right to acquire and which is denominated in the currency
               underlying the option. Call options on foreign currencies which
               are entered into for cross-hedging purposes are not covered.
               However, in such circumstances, the Fund will collateralize the
               option by segregating cash or other liquid assets in an amount
               not less than the value of the underlying foreign currency in
               U.S. dollars marked-to-market daily.
 
               OPTIONS ON SECURITIES. In an effort to increase current income
               and to reduce fluctuations in net asset value, the Fund may write
               covered put and call options and buy put and call options on
               securities that are traded on United States and foreign
               securities exchanges and over-the-counter. The Fund may write and
               buy options on the same types of securities that the Fund may
               purchase directly.
 
               A put option written by the Fund is "covered" if the Fund (i)
               segregates cash not available for investment or other liquid
               assets with a value equal to the exercise price of the put with
               the Fund's custodian or (ii) holds a put on the same security and
               in the same principal amount as the put written and the exercise
               price of the put held is equal to or greater than the exercise
               price of the put written. The premium paid by the buyer of an
               option will reflect, among other things, the relationship of the
               exercise price to the market price and the volatility of the
               underlying security, the remaining term of the option, supply and
               demand and interest rates.
 
               A call option written by the Fund is "covered" if the Fund owns
               the underlying security covered by the call or has an absolute
               and immediate right to acquire that security without additional
               cash consideration (or for additional cash consideration held in
               a segregated account by the Fund's custodian) upon conversion or
               exchange of other securities held in its portfolio. A call option
               is
 
 28
<PAGE> 
 
               also deemed to be covered if the Fund holds a call on the same
               security and in the same principal amount as the call written and
               the exercise price of the call held (i) is equal to or less than
               the exercise price of the call written or (ii) is greater than
               the exercise price of the call written if the difference is
               maintained by the Fund in cash and other liquid assets in a
               segregated account with its custodian.
 
               The Fund also may write call options that are not covered for
               cross-hedging purposes. The Fund collateralizes its obligation
               under a written call option for cross-hedging purposes by
               segregating cash or other liquid assets in an amount not less
               than the market value of the underlying security,
               marked-to-market daily. The Fund would write a call option for
               cross-hedging purposes, instead of writing a covered call option,
               when the premium to be received from the cross-hedge transaction
               would exceed that which would be received from writing a covered
               call option and its portfolio managers believe that writing the
               option would achieve the desired hedge.
 
               The writer of an option may have no control over when the
               underlying securities must be sold, in the case of a call option,
               or bought, in the case of a put option, since with regard to
               certain options, the writer may be assigned an exercise notice at
               any time prior to the termination of the obligation. Whether or
               not an option expires unexercised, the writer retains the amount
               of the premium. This amount, of course, may, in the case of a
               covered call option, be offset by a decline in the market value
               of the underlying security during the option period. If a call
               option is exercised, the writer experiences a profit or loss from
               the sale of the underlying security. If a put option is
               exercised, the writer must fulfill the obligation to buy the
               underlying security at the exercise price, which will usually
               exceed the then market value of the underlying security.
 
               The writer of an option that wishes to terminate its obligation
               may effect a "closing purchase transaction." This is accomplished
               by buying an option of the same series as the option previously
 
                                                                              29
<PAGE> 
 
               written. The effect of the purchase is that the writer's position
               will be canceled by the clearing corporation. However, a writer
               may not effect a closing purchase transaction after being
               notified of the exercise of an option. Likewise, an investor who
               is the holder of an option may liquidate its position by
               effecting a "closing sale transaction." This is accomplished by
               selling an option of the same series as the option previously
               bought. There is no guarantee that either a closing purchase or a
               closing sale transaction can be effected.
 
               In the case of a written call option, effecting a closing
               transaction will permit the Fund to write another call option on
               the underlying security with either a different exercise price or
               expiration date or both. In the case of a written put option,
               such transaction will permit the Fund to write another put option
               to the extent that the exercise price is secured by other liquid
               assets. Effecting a closing transaction also will permit the Fund
               to use the cash or proceeds from the concurrent sale of any
               securities subject to the option for other investments. If the
               Fund desires to sell a particular security from its portfolio on
               which it has written a call option, the Fund will effect a
               closing transaction prior to or concurrent with the sale of the
               security.
 
               The Fund will realize a profit from a closing transaction if the
               price of the purchase transaction is less than the premium
               received from writing the option or the price received from a
               sale transaction is more than the premium paid to buy the option.
               The Fund will realize a loss from a closing transaction if the
               price of the purchase transaction is more than the premium
               received from writing the option or the price received from a
               sale transaction is less than the premium paid to buy the option.
               Because increases in the market of a call option generally will
               reflect increases in the market price of the underlying security,
               any loss resulting from the repurchase of a call option is likely
               to be offset in whole or in part by appreciation of the
               underlying security owned by the Fund.
 
               An option position may be closed out only where a secondary
               market for an option of the same series exists. If a secondary
 
 30
<PAGE> 
 
               market does not exist, the Fund may not be able to effect closing
               transactions in particular options and the Fund would have to
               exercise the options in order to realize any profit. If the Fund
               is unable to effect a closing purchase transaction in a secondary
               market, it will not be able to sell the underlying security until
               the option expires or it delivers the underlying security upon
               exercise. The absence of a liquid secondary market may be due to
               the following: (i) insufficient trading interest in certain
               options, (ii) restrictions imposed by a national securities
               exchange ("Exchange") on which the option is traded on opening or
               closing transactions or both, (iii) trading halts, suspensions or
               other restrictions imposed with respect to particular classes or
               series of options or underlying securities, (iv) unusual or
               unforeseen circumstances that interrupt normal operations on an
               Exchange, (v) the facilities of an Exchange or of the Options
               Clearing Corporation ("OCC") may not at all times be adequate to
               handle current trading volume, or (vi) one or more Exchanges
               could, for economic or other reasons, decide or be compelled at
               some future date to discontinue the trading of options (or a
               particular class or series of options), in which event the
               secondary market on that Exchange (or in that class or series of
               options) would cease to exist, although outstanding options on
               that Exchange that had been issued by the OCC as a result of
               trades on that Exchange would continue to be exercisable in
               accordance with their terms.
 
               The Fund may write options in connection with buy-and-write
               transactions. In other words, the Fund may buy a security and
               then write a call option against that security. The exercise
               price of such call will depend upon the expected price movement
               of the underlying security. The exercise price of a call option
               may be below ("in-the-money"), equal to ("at-the-money") or above
               ("out-of-the-money") the current value of the underlying security
               at the time the option is written. Buy-and-write transactions
               using in-the-money call options may be used when it is expected
               that the price of the underlying security will remain flat or
               decline moderately during the option period. Buy-and-write
               transactions using at-the-money call options may be used when it
               is expected
 
                                                                              31
<PAGE> 
 
               that the price of the underlying security will remain fixed or
               advance moderately during the option period. Buy-and-write
               transactions using out-of-the-money call options may be used when
               it is expected that the premiums received from writing the call
               option plus the appreciation in the market price of the
               underlying security up to the exercise price will be greater than
               the appreciation in the price of the underlying security alone.
               If the call options are exercised in such transactions, the
               Fund's maximum gain will be the premium received by it for
               writing the option, adjusted upwards or downwards by the
               difference between the Fund's purchase price of the security and
               the exercise price. If the options are not exercised and the
               price of the underlying security declines, the amount of such
               decline will be offset by the amount of premium received.
 
               The writing of covered put options is similar in terms of risk
               and return characteristics to buy-and-write transactions. If the
               market price of the underlying security rises or otherwise is
               above the exercise price, the put option will expire worthless
               and the Fund's gain will be limited to the premium received. If
               the market price of the underlying security declines or otherwise
               is below the exercise price, the Fund may elect to close the
               position or take delivery of the security at the exercise price
               and the Fund's return will be the premium received from the put
               options minus the amount by which the market price of the
               security is below the exercise price.
 
               The Fund may buy put options to hedge against a decline in the
               value of its portfolio. By using put options in this way, the
               Fund will reduce any profit it might otherwise have realized in
               the underlying security by the amount of the premium paid for the
               put option and by transaction costs.
 
               The Fund may buy call options to hedge against an increase in the
               price of securities that it may buy in the future. The premium
               paid for the call option plus any transaction costs will reduce
               the benefit, if any, realized by the Fund upon exercise of the
               option, and, unless the price of the underlying security rises
               sufficiently, the option may expire worthless to the Fund.
 
 32
<PAGE> 
 
               EURODOLLAR INSTRUMENTS. The Fund may make investments in
               Eurodollar instruments. Eurodollar instruments are U.S. dollar-
               denominated futures contracts or options thereon which are linked
               to the London Interbank Offered Rate ("LIBOR"), although foreign
               currency-denominated instruments are available from time to time.
               Eurodollar futures contracts enable purchasers to obtain a fixed
               rate for the lending of funds and sellers to obtain a fixed rate
               for borrowings. The Fund might use Eurodollar futures contracts
               and options thereon to hedge against changes in LIBOR, to which
               many interest rate swaps and fixed-income instruments are linked.
 
               SWAPS AND SWAP-RELATED PRODUCTS. The Fund may enter into interest
               rate swaps, caps and floors on either an asset-based or
               liability-based basis, depending upon whether it is hedging its
               assets or its liabilities, and will usually enter into interest
               rate swaps on a net basis (i.e., the two payment streams are
               netted out, with the Fund receiving or paying, as the case may
               be, only the net amount of the two payments). The net amount of
               the excess, if any, of the Fund's obligations over its
               entitlement with respect to each interest rate swap will be
               calculated on a daily basis and an amount of cash or other liquid
               assets having an aggregate net asset value at least equal to the
               accrued excess will be maintained in a segregated account by the
               Fund's custodian. If the Fund enters into an interest rate swap
               on other than a net basis, it would maintain a segregated account
               in the full amount accrued on a daily basis of its obligations
               with respect to the swap. The Fund will not enter into any
               interest rate swap, cap or floor transaction unless the unsecured
               senior debt or the claims-paying ability of the other party
               thereto is rated in one of the three highest rating categories of
               at least one NRSRO at the time of entering into such transaction.
               Janus Capital will monitor the creditworthiness of all
               counterparties on an ongoing basis. If there is a default by the
               other party to such a transaction, the Fund will have contractual
               remedies pursuant to the agreements related to the transaction.
 
               The swap market has grown substantially in recent years with a
               large number of banks and investment banking firms acting both
 
                                                                              33
<PAGE> 
 
               as principals and as agents utilizing standardized swap
               documentation. Janus Capital has determined that, as a result,
               the swap market has become relatively liquid. Caps and floors are
               more recent innovations for which standardized documentation has
               not yet been developed and, accordingly, they are less liquid
               than swaps. To the extent the Fund sells (i.e., writes) caps and
               floors, it will segregate cash or other liquid assets having an
               aggregate net asset value at least equal to the full amount,
               accrued on a daily basis, of its obligations with respect to any
               caps or floors.
 
               There is no limit on the amount of interest rate swap
               transactions that may be entered into by the Fund. These
               transactions may in some instances involve the delivery of
               securities or other underlying assets by the Fund or its
               counterparty to collateralize obligations under the swap. Under
               the documentation currently used in those markets, the risk of
               loss with respect to interest rate swaps is limited to the net
               amount of the payments that the Fund is contractually obligated
               to make. If the other party to an interest rate swap that is not
               collateralized defaults, the Fund would risk the loss of the net
               amount of the payments that it contractually is entitled to
               receive. The Fund may buy and sell (i.e., write) caps and floors
               without limitation, subject to the segregation requirement
               described above.
 
               ADDITIONAL RISKS OF OPTIONS ON FOREIGN CURRENCIES, FORWARD
               CONTRACTS AND FOREIGN INSTRUMENTS. Unlike transactions entered
               into by the Fund in futures contracts, options on foreign
               currencies and forward contracts are not traded on contract
               markets regulated by the CFTC or (with the exception of certain
               foreign currency options) by the SEC. To the contrary, such
               instruments are traded through financial institutions acting as
               market-makers, although foreign currency options are also traded
               on certain Exchanges, such as the Philadelphia Stock Exchange and
               the Chicago Board Options Exchange, subject to SEC regulation.
               Similarly, options on currencies may be traded over the-counter.
               In an over-the-counter trading environment, many of the
               protections afforded to Exchange participants will not be
               available. For example, there are no daily price fluctuation
               limits,
 
 34
<PAGE> 
 
               and adverse market movements could therefore continue to an
               unlimited extent over a period of time. Although the buyer of an
               option cannot lose more than the amount of the premium plus
               related transaction costs, this entire amount could be lost.
               Moreover, an option writer and a buyer or seller of futures or
               forward contracts could lose amounts substantially in excess of
               any premium received or initial margin or collateral posted due
               to the potential additional margin and collateral requirements
               associated with such positions.
 
               Options on foreign currencies traded on Exchanges are within the
               jurisdiction of the SEC, as are other securities traded on
               Exchanges. As a result, many of the protections provided to
               traders on organized Exchanges will be available with respect to
               such transactions. In particular, all foreign currency option
               positions entered into on an Exchange are cleared and guaranteed
               by the OCC, thereby reducing the risk of counterparty default.
               Further, a liquid secondary market in options traded on an
               Exchange may be more readily available than in the over-the-
               counter market, potentially permitting the Fund to liquidate open
               positions at a profit prior to exercise or expiration, or to
               limit losses in the event of adverse market movements.
 
               The purchase and sale of exchange-traded foreign currency
               options, however, is subject to the risks of the availability of
               a liquid secondary market described above, as well as the risks
               regarding adverse market movements, margining of options written,
               the nature of the foreign currency market, possible intervention
               by governmental authorities and the effects of other political
               and economic events. In addition, exchange-traded options on
               foreign currencies involve certain risks not presented by the
               over-the-counter market. For example, exercise and settlement of
               such options must be made exclusively through the OCC, which has
               established banking relationships in applicable foreign countries
               for this purpose. As a result, the OCC may, if it determines that
               foreign governmental restrictions or taxes would prevent the
               orderly settlement of foreign currency option exercises, or would
               result in undue burdens on the OCC or its clearing
 
                                                                              35
<PAGE> 
 
               member, impose special procedures on exercise and settlement,
               such as technical changes in the mechanics of delivery of
               currency, the fixing of dollar settlement prices or prohibitions
               on exercise.
 
               In addition, options on U.S. government securities, futures
               contracts, options on futures contracts, forward contracts and
               options on foreign currencies may be traded on foreign exchanges
               and over-the-counter in foreign countries. Such transactions are
               subject to the risk of governmental actions affecting trading in
               or the prices of foreign currencies or securities. The value of
               such positions also could be adversely affected by (i) other
               complex foreign political and economic factors, (ii) lesser
               availability than in the United States of data on which to make
               trading decisions, (iii) delays in the Fund's ability to act upon
               economic events occurring in foreign markets during non-business
               hours in the United States, (iv) the imposition of different
               exercise and settlement terms and procedures and margin
               requirements than in the United States, and (v) low trading
               volume.
 
 36
<PAGE> 
Investment adviser
 
               As stated in the Prospectus, the Fund has an Investment Advisory
               Agreement with Janus Capital, 100 Fillmore Street, Denver,
               Colorado 80206-4928. The Advisory Agreement provides that Janus
               Capital will furnish continuous advice and recommendations
               concerning the Fund's investments, provide office space for the
               Fund, and pay the salaries, fees and expenses of all Fund
               officers and of those Trustees who are affiliated with Janus
               Capital. Janus Capital also may make payments to selected
               broker-dealer firms or institutions which perform recordkeeping
               or other services with respect to shareholder accounts. The
               minimum aggregate size required for eligibility for such
               payments, and the factors in selecting the broker-dealer firms
               and institutions to which they will be made, are determined from
               time to time by Janus Capital. Janus Capital is also authorized
               to perform the management and administrative services necessary
               for the operation of the Fund.
 
               The Fund pays custodian and transfer agent fees and expenses,
               brokerage commissions and dealer spreads and other expenses in
               connection with the execution of portfolio transactions, legal
               and accounting expenses, interest and taxes, registration fees,
               expenses of shareholders' meetings and reports to shareholders,
               fees and expenses of Trustees who are not affiliated with Janus
               Capital, costs of preparing, printing and mailing the Fund's
               Prospectus and SAI to current shareholders, and other costs of
               complying with applicable laws regulating the sale of Fund
               shares. Pursuant to the Advisory Agreement, Janus Capital
               furnishes certain other services, including net asset value
               determination and Fund accounting, recordkeeping, and blue sky
               registration and monitoring services, for which the Fund may
               reimburse Janus Capital for its costs.
 
               The Fund has agreed to compensate Janus Capital for its services
               by the monthly payment of a fee at the annual rate of 0.75% of
               the first $300 million of the Fund's average daily net assets,
               0.70% of the next $200 million of the Fund's average daily net
               assets, and 0.65% of the average daily net assets of the Fund in
               excess of $500 million.
 
   
               For the fiscal year ended October 31, 1998, the investment
               advisory fee was $26,060,535. For the fiscal years ended
    
 
                                                                              37
<PAGE> 
 
               October 31, 1997 and October 31, 1996, the Fund incurred
               investment advisory fees of $14,049,919 and $2,528,345,
               respectively. Janus Capital did not waive any portion of its fee
               in any of these years.
 
               The Advisory Agreement is dated July 1, 1997, and it will
               continue in effect until July 1, 1999, and thereafter from year
               to year so long as such continuance is approved annually by a
               majority of the Fund's Trustees who are not parties to the
               Advisory Agreement or interested persons of any such party, and
               by either a majority of the outstanding voting shares or the
               Trustees of the Fund. The Advisory Agreement i) may be terminated
               without the payment of any penalty by the Fund or Janus Capital
               on 60 days' written notice; ii) terminates automatically in the
               event of its assignment; and iii) generally, may not be amended
               without the approval by vote of a majority of the Trustees of the
               Fund, including the Trustees who are not interested persons of
               the Fund or Janus Capital and, to the extent required by the 1940
               Act, the vote of a majority of the outstanding voting securities
               of the Fund.
 
               Janus Capital also acts as sub-adviser for a number of
               private-label mutual funds and provides separate account advisory
               services for institutional accounts. Investment decisions for
               each account managed by Janus Capital, including the Fund, are
               made independently from those for any other account that is or
               may in the future become managed by Janus Capital or its
               affiliates. If, however, a number of accounts managed by Janus
               Capital are contemporaneously engaged in the purchase or sale of
               the same security, the orders may be aggregated and/or the
               transactions may be averaged as to price and allocated equitably
               to each account. In some cases, this policy might adversely
               affect the price paid or received by an account or the size of
               the position obtained or liquidated for an account. Pursuant to
               an exemptive order granted by the SEC, the Fund and other funds
               advised by Janus Capital may also transfer daily uninvested cash
               balances into one or more joint trading accounts. Assets in the
               joint trading accounts are invested in money market instruments
               and the proceeds are allocated to the participating Funds on a
               pro rata basis.
 
 38
<PAGE> 
 
               Kansas City Southern Industries, Inc. ("KCSI") owns approximately
               82% of the outstanding voting stock of Janus Capital, most of
               which it acquired in 1984. KCSI is a publicly traded holding
               company whose primary subsidiaries are engaged in transportation,
               information processing and financial services. Thomas H. Bailey,
               President and Chairman of the Board of Janus Capital, owns
               approximately 12% of its voting stock and, by agreement with
               KCSI, selects a majority of Janus Capital's Board.
 
               KCSI has announced its intention to separate its transportation
               and financial services businesses. KCSI is currently studying
               alternatives for completion of the separation that meet its
               business objectives without risking adverse tax consequences.
               KCSI expects completion of the separation to be contemplated in
               1999.
 
               Each account managed by Janus Capital has its own investment
               objective and policies and is managed accordingly by a particular
               portfolio manager or team of portfolio managers. As a result,
               from time to time two or more different managed accounts may
               pursue divergent investment strategies with respect to
               investments or categories of investments.
 
               Janus Capital does not permit the Fund's portfolio managers to
               purchase and sell securities for their own accounts except under
               the limited exceptions contained in Janus Capital's policy
               regarding personal investing by directors/Trustees, officers and
               employees of Janus Capital and the Trust. The policy requires
               investment personnel and officers of Janus Capital, inside
               directors/Trustees of Janus Capital and the Fund and other
               designated persons deemed to have access to current trading
               information to pre-clear all transactions in securities not
               otherwise exempt under the policy. Requests for trading authority
               will be denied when, among other reasons, the proposed personal
               transaction would be contrary to the provisions of the policy or
               would be deemed to adversely affect any transaction known to be
               under consideration for or to have been effected on behalf of any
               client account, including the Fund.
 
                                                                              39
<PAGE> 
 
               In addition to the pre-clearance requirement described above, the
               policy subjects investment personnel, officers and directors/
               Trustees of Janus Capital and the Trust to various trading
               restrictions and reporting obligations. All reportable
               transactions are required to be reviewed for compliance with
               Janus Capital's policy. Those persons also may be required under
               certain circumstances to forfeit their profits made from personal
               trading.
 
               The provisions of the policy are administered by and subject to
               exceptions authorized by Janus Capital.
 
 40
<PAGE> 
Custodian, transfer agent and 
         certain affiliations
 
               State Street Bank and Trust Company, P.O. Box 0351, Boston,
               Massachusetts 02117-0351 is the custodian of the domestic
               securities and cash of the Fund. State Street and the foreign
               subcustodians selected by it and approved by the Trustees have
               custody of the assets of the Fund held outside the U.S. and cash
               incidental thereto. The custodian and subcustodians hold the
               Fund's assets in safekeeping and collect and remit the income
               thereon, subject to the instructions of the Fund.
 
               Janus Service Corporation, P.O. Box 173375, Denver, Colorado
               80217-3375, a wholly-owned subsidiary of Janus Capital, is the
               Fund's transfer agent. In addition, Janus Service provides
               certain other administrative, recordkeeping and shareholder
               relations services to the Fund. For transfer agency and other
               services, Janus Service receives a fee calculated at an annual
               rate of 0.16% of average net assets of the Fund. In addition, the
               Fund pays DST Systems, Inc. ("DST"), a subsidiary of KCSI,
               license fees at the rate of $3.06 per shareholder account for the
               use of DST's shareholder accounting system. The fund also pays
               DST $1.10 per closed shareholder account. The Fund pays DST for
               the use of its portfolio and fund accounting system a monthly
               base fee of $250 to $1,250 based on the number of Janus funds
               using the system and an asset charge of $1 per million dollars of
               net assets (not to exceed $500 per month). In addition, the Fund
               pays DST postage and forms costs of a DST affiliate incurred in
               mailing Fund shareholder transaction confirmations.
 
               The Trustees have authorized the Fund to use another affiliate of
               DST as introducing broker for certain Fund portfolio transactions
               as a means to reduce Fund expenses through credits against the
               charges of DST and its affiliates with regard to commissions
               earned by such affiliate. See "Portfolio Transactions and
               Brokerage."
 
               Janus Distributors, Inc., 100 Fillmore Street, Denver, Colorado
               80206-4928, a wholly-owned subsidiary of Janus Capital, is a
               distributor of the Fund. Janus Distributors is registered as a
               broker-dealer under the Securities Exchange Act of 1934 and is a
               member of the National Association of Securities Dealers, Inc.
 
                                                                              41
<PAGE> 
 
               Janus Distributors acts as the agent of the Fund in connection
               with the sale of its shares in all states in which the shares are
               registered and in which Janus Distributors is qualified as a
               broker-dealer. Under the Distribution Agreement, Janus
               Distributors continuously offers the Fund's shares and accepts
               orders at net asset value. No sales charges are paid by
               investors. Promotional expenses in connection with offers and
               sales of shares are paid by Janus Capital.
 
 42
<PAGE> 
                                            Portfolio transactions and brokerage
 
               Decisions as to the assignment of portfolio business for the Fund
               and negotiation of its commission rates are made by Janus
               Capital, whose policy is to obtain the "best execution" (prompt
               and reliable execution at the most favorable security price) of
               all portfolio transactions. The Fund may trade foreign securities
               in foreign countries because the best available market for these
               securities is often on foreign exchanges. In transactions on
               foreign stock exchanges, brokers' commissions are frequently
               fixed and are often higher than in the United States, where
               commissions are negotiated.
 
               In selecting brokers and dealers and in negotiating commissions,
               Janus Capital considers a number of factors, including but not
               limited to: Janus Capital's knowledge of currently available
               negotiated commission rates or prices of securities currently
               available and other current transaction costs; the nature of the
               security being traded; the size and type of the transaction; the
               nature and character of the markets for the security to be
               purchased or sold; the desired timing of the trade; the activity
               existing and expected in the market for the particular security;
               confidentiality; the quality of the execution, clearance and
               settlement services; financial stability of the broker or dealer;
               the existence of actual or apparent operational problems of any
               broker or dealer; rebates of commissions by a broker to the Fund
               or to a third party service provider to the Fund to pay Fund
               expenses; and research products or services provided. In
               recognition of the value of the foregoing factors, Janus Capital
               may place portfolio transactions with a broker or dealer with
               whom it has negotiated a commission that is in excess of the
               commission another broker or dealer would have charged for
               effecting that transaction if Janus Capital determines in good
               faith that such amount of commission was reasonable in relation
               to the value of the brokerage and research provided by such
               broker or dealer viewed in terms of either that particular
               transaction or of the overall responsibilities of Janus Capital.
               Research may include furnishing advice, either directly or
               through publications or writings, as to the value of securities,
               the advisability of purchasing or selling specific securities and
               the availability of securities or purchasers or sellers
 
                                                                              43
<PAGE> 
 
               of securities; furnishing seminars, information, analyses and
               reports concerning issuers, industries, securities, trading
               markets and methods, legislative developments, changes in
               accounting practices, economic factors and trends and portfolio
               strategy; access to research analysts, corporate management
               personnel, industry experts, economists and government officials;
               comparative performance evaluation and technical measurement
               services and quotation services, and products and other services
               (such as third party publications, reports and analyses, and
               computer and electronic access, equipment, software, information
               and accessories that deliver, process or otherwise utilize
               information, including the research described above) that assist
               Janus Capital in carrying out its responsibilities.
 
   
               Most brokers and dealers used by Janus Capital provide research
               and other services described above. For the year ended October
               31, 1998, the Fund paid $559,952 of its total brokerage
               commissions to brokers and dealers in transactions identified for
               execution primarily on the basis of research and other services
               provided to the Fund on transactions of $328,382,673. Research
               received from brokers or dealers is supplemental to Janus
               Capital's own research efforts.
    
 
               Janus Capital may use research products and services in servicing
               other accounts in addition to the Fund. If Janus Capital
               determines that any research product or service has a mixed use,
               such that it also serves functions that do not assist in the
               investment decision-making process, Janus Capital may allocate
               the costs of such service or product accordingly. Only that
               portion of the product or service that Janus Capital determines
               will assist it in the investment decision-making process may be
               paid for in brokerage commission dollars. Such allocation may
               create a conflict of interest for Janus Capital.
 
               Janus Capital does not enter into agreements with any brokers
               regarding the placement of securities transactions because of the
               research services they provide. It does, however, have an
               internal procedure for allocating transactions in a manner
               consistent with its execution policy to brokers that it has
               identified as providing
 
 44
<PAGE> 
 
               superior execution and research, research-related products or
               services which benefit its advisory clients, including the Fund.
               Research products and services incidental to effecting securities
               transactions furnished by brokers or dealers may be used in
               servicing any or all of Janus Capital's clients and such research
               may not necessarily be used by Janus Capital in connection with
               the accounts which paid commissions to the broker-dealer
               providing such research products and services.
 
               Janus Capital may consider sales of Fund shares by a broker-
               dealer or the recommendation of a broker-dealer to its customers
               that they purchase Fund shares as a factor in the selection of
               broker-dealers to execute Fund portfolio transactions. Janus
               Capital may also consider payments made by brokers effecting
               transactions for the Fund i) to the Fund or ii) to other persons
               on behalf of the Fund for services provided to the Fund for which
               it would be obligated to pay. In placing portfolio business with
               such broker-dealers, Janus Capital will seek the best execution
               of each transaction.
 
               When the Fund purchases or sells a security in the over-the-
               counter market, the transaction takes place directly with a
               principal market-maker, without the use of a broker, except in
               those circumstances where in the opinion of Janus Capital better
               prices and executions will be achieved through the use of a
               broker.
 
               The Fund's Trustees have authorized Janus Capital to place
               transactions with DST Securities, Inc. ("DSTS"), a wholly-owned
               broker-dealer subsidiary of DST. Janus Capital may do so if it
               reasonably believes that the quality of the transaction and the
               associated commission are fair and reasonable and if, overall,
               the associated transaction costs, net of any credits described
               above under "Custodian, Transfer Agent and Certain Affiliations,"
               are lower than those that would otherwise be incurred.
 
   
               The total amount of brokerage commissions paid by the Fund during
               the fiscal year ended October 31, 1998, was $13,649,799. For the
               fiscal years ended October 31, 1997 and October 31,
    
 
                                                                              45
<PAGE> 
 
   
               1996, the Fund paid brokerage commissions of $9,508,507 and
               $1,900,947, respectively. Included in the brokerage commissions
               paid for the fiscal year ended October 31, 1998, was $4,968 paid
               through DSTS, which served to reduce by $3,726 certain
               out-of-pocket expenses paid by the Fund. Included in brokerage
               commissions paid for the fiscal years ended October 31, 1997 and
               October 31, 1996, was $15,169 and $5,123, respectively, paid
               through DSTS which served to reduce by $11,377 and $3,842,
               respectively, certain out-of-pocket expenses. Brokerage
               commissions paid through DSTS for the 1998 fiscal year
               represented 0.04% of the Fund's aggregate brokerage commissions
               for such fiscal year, while 0.12% of the aggregate dollar amount
               of the Fund's portfolio transactions involving a commission
               payment were executed through DSTS. The difference between
               commissions paid through DSTS and expenses reduced constitute
               commissions paid to an unaffiliated clearing broker. Differences
               in the percentage of total commissions versus the percentage of
               total transactions is due, in part, to variations among share
               prices and number of shares traded, while average price per share
               commission rates were substantially the same.
    
 
   
               As of October 31, 1998, the Fund did not own securities of
               regular broker-dealers (or parents).
    
   
    
 
 46
<PAGE> 
Trustees and officers
 
               The following are the names of the Trustees and officers of the
               Trust, together with a brief description of their principal
               occupations during the last five years.
 
Thomas H. Bailey, Age 61 - Trustee, Chairman and President*#
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Trustee, Chairman and President of Janus Aspen Series. Chairman,
               Chief Executive Officer, Director and President of Janus Capital.
               Director of Janus Distributors, Inc.
 
James P. Craig, III, Age 42 - Trustee and Executive Vice President*#
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Trustee and Executive Vice President of Janus Aspen Series. Chief
               Investment Officer, Vice Chairman and Director of Janus Capital.
               Executive Vice President and Portfolio Manager of Janus Fund.
               Executive Vice President and Co-Manager of Janus Venture Fund.
 
Gary O. Loo, Age 58 - Trustee#
102 N. Cascade, Suite 500
Colorado Springs, CO 80903
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. President and Director of High
               Valley Group, Inc., Colorado Springs, CO (investments).
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
#Member of the Trust's Executive Committee.
 
                                                                              47
<PAGE> 
 
Dennis B. Mullen, Age 55 - Trustee
7500 E. McCormick Parkway, #24
Scottsdale, AZ 85258
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Private Investor. Formerly
               (1997-1998), Chief Financial Officer-Boston Market Concepts,
               Boston Chicken, Inc., Golden, CO (restaurant chain); (1993-1997),
               President and Chief Executive Officer of BC Northwest, L.P., a
               franchise of Boston Chicken, Inc., Bellevue, WA (restaurant
               chain).
 
James T. Rothe, Age 55 - Trustee
102 South Tejon Street, Suite 1100
Colorado Springs, CO 80903
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Professor of Business, University
               of Colorado, Colorado Springs, CO. Principal, Phillips-Smith
               Retail Group, Colorado Springs, CO (a venture capital firm).
               Formerly (1986-1994), Dean of the College of Business, University
               of Colorado, Colorado Springs, CO.
 
William D. Stewart, Age 54 - Trustee#
5330 Sterling Drive
Boulder, CO 80302
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. President of HPS Division of MKS
               Instruments, Boulder, CO (manufacturer of vacuum fittings and
               valves).
 
Martin H. Waldinger, Age 60 - Trustee
4940 Sandshore Court
San Diego, CA 92130
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Private Consultant. Formerly
               (1993-1996), Director of Run Technologies, Inc., a software
               development firm, San Carlos, CA.
 
- --------------------------------------------------------------------------------
#Member of the Trust's Executive Committee.
 
 48
<PAGE> 
 
Laurence J. Chang, Age 33 - Executive Vice President*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Co-Manager of Janus Overseas Fund.
               Assistant Portfolio Manager of Janus Worldwide Fund. Executive
               Vice President of Janus Aspen Series. Vice President of Janus
               Capital. Formerly, research analyst at Janus Capital (1993-1996).
 
Helen Young Hayes, Age 36 - Executive Vice President*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Executive Vice President and Co-Manager of Janus Overseas Fund.
               Executive Vice President and Portfolio Manager of Janus Worldwide
               Fund, Executive Vice President of Janus Aspen Series. Vice
               President of Janus Capital.
 
Thomas A. Early, Age 44 - Vice President and General Counsel*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Vice President and General Counsel of Janus Aspen Series. Vice
               President, General Counsel and Secretary of Janus Capital. Vice
               President and General Counsel of Janus Service Corporation, Janus
               Distributors, Inc. and Janus Capital International, Ltd. Director
               of Janus World Funds Plc. Formerly (1997-1998), Executive Vice
               President and General Counsel of Prudential Investments Fund
               Management LLC, Newark, NJ. Formerly (1994-1997), Vice President
               and General Counsel of Prudential Retirement Services, Newark,
               NJ. Formerly (1988-1994), Associate General Counsel and Chief
               Financial Services Counsel, Frank Russell Company, Tacoma, WA.
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
 
                                                                              49
<PAGE> 
 
Steven R. Goodbarn, Age 41  - Vice President and Chief Financial Officer*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Vice President and Chief Financial Officer of Janus Aspen Series.
               Vice President of Finance, Treasurer and Chief Financial Officer
               of Janus Capital, Janus Service Corporation and Janus
               Distributors, Inc. Director of Janus Service Corporation, Janus
               Distributors, Inc. and Janus World Funds Plc. Director, Treasurer
               and Vice President of Finance of Janus Capital International Ltd.
               Formerly (May 1992-January 1996), Treasurer of Janus Investment
               Fund and Janus Aspen Series.
 
Kelley Abbott Howes, Age 33 - Assistant Vice President and Secretary*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Assistant Vice President and Secretary of Janus Aspen Series.
               Director and President of Janus Distributors, Inc. Assistant Vice
               President and Associate Counsel of Janus Capital. Formerly
               (1990-1994), with The Boston Company Advisors, Inc., Boston, MA
               (mutual fund administration services).
 
Glenn P. O'Flaherty, Age 40 - Treasurer and Chief Accounting Officer*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Treasurer and Chief Accounting Officer of Janus Aspen Series.
               Vice President of Janus Capital. Formerly (1991 to 1997),
               Director of Fund Accounting, Janus Capital.
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
 
 50
<PAGE> 
 
               The Trustees are responsible for major decisions relating to the
               Fund's objective, policies and techniques. The Trustees also
               supervise the operation of the Fund by its officers and review
               the investment decisions of the officers, although they do not
               actively participate on a regular basis in making such decisions.
 
               The Trust's Executive Committee shall have and may exercise all
               the powers and authority of the Trustees except for matters
               requiring action by all Trustees pursuant to the Trust's Bylaws
               or Agreement and Declaration of Trust, Massachusetts law or the
               1940 Act.
 
               The following table shows the aggregate compensation earned by
               and paid to each Trustee by the Fund described in this SAI and
               all funds advised and sponsored by Janus Capital (collectively,
               the "Janus Funds") for the periods indicated. None of the
               Trustees receives any pension or retirement benefits from the
               Fund or the Janus Funds.
 
   
<TABLE>
<CAPTION>
                                              Aggregate Compensation      Total Compensation
                                                from the Fund for      from the Janus Funds for
                                                fiscal year ended        calendar year ended
          Name of Person, Position               October 31, 1998        December 31, 1998**
- ------------------------------------------------------------------------------------------------
<S>                                           <C>                     <C>
Thomas H. Bailey, Chairman and Trustee*                 $0                        $0
James P. Craig, Trustee*                                $0                        $0
William D. Stewart, Trustee                           $4,934                   $82,000
Gary O. Loo, Trustee                                  $3,862                   $74,000
Dennis B. Mullen, Trustee                             $4,488                   $82,000
Martin H. Waldinger, Trustee                          $4,675                   $74,000
James T. Rothe, Trustee                               $4,528                   $82,000
</TABLE>
    
 
 *An interested person of the Fund and of Janus Capital. Compensated by Janus
  Capital and not the Fund.
   
**As of December 31, 1998, Janus Funds consisted of two registered investment
  companies comprised of a total of 32 funds.
    
 
                                                                              51
<PAGE> 
Purchase of shares
 
               The Fund has discontinued public sales of its shares to new
               investors. Only shareholders who maintain open accounts are
               permitted to continue to make investments in the Fund and to
               reinvest any dividends and capital gains distributions. Once a
               Fund account is closed, additional investments in the Fund may
               not be possible. The Shareholder's Manual section of the
               Prospectus contains detailed information about the purchase of
               shares.
 
NET ASSET VALUE DETERMINATION
 
               As stated in the Prospectus, the net asset value ("NAV") of Fund
               shares is determined once each day on which the New York Stock
               Exchange ("NYSE") is open, at the close of its regular trading
               session (normally 4:00 p.m., New York time, Monday through
               Friday). As stated in the Prospectus, the NAV of Fund shares is
               not determined on days the NYSE is closed (generally, New Year's
               Day, Presidents' Day, Martin Luther King Day, Good Friday,
               Memorial Day, Independence Day, Labor Day, Thanksgiving and
               Christmas). The per share NAV of the Fund is determined by
               dividing the total value of the Fund's securities and other
               assets, less liabilities, by the total number of shares
               outstanding. In determining NAV, securities listed on an
               Exchange, the NASDAQ National Market and foreign markets are
               valued at the closing prices on such markets, or if such price is
               lacking for the trading period immediately preceding the time of
               determination, such securities are valued at their current bid
               price. Municipal securities held by the Fund are traded primarily
               in the over-the-counter market. Valuations of such securities are
               furnished by one or more pricing services employed by the Fund
               and are based upon a computerized matrix system or appraisals
               obtained by a pricing service, in each case in reliance upon
               information concerning market transactions and quotations from
               recognized municipal securities dealers. Other securities that
               are traded on the over-the-counter market are valued at their
               closing bid prices. Foreign securities and currencies are
               converted to U.S. dollars using the exchange rate in effect at
               the close of the NYSE. The Fund will determine the market value
               of individual securities held by it, by using prices provided by
               one or more professional pricing services
 
 52
<PAGE> 
 
               which may provide market prices to other funds, or, as needed, by
               obtaining market quotations from independent broker-dealers.
               Short-term securities maturing within 60 days are valued on an
               amortized cost basis. Securities for which quotations are not
               readily available, and other assets, are valued at fair values
               determined in good faith under procedures established by and
               under the supervision of the Trustees.
 
               Trading in securities on European and Far Eastern securities
               exchanges and over-the-counter markets is normally completed well
               before the close of business on each business day in New York
               (i.e., a day on which the NYSE is open). In addition, European or
               Far Eastern securities trading generally or in a particular
               country or countries may not take place on all business days in
               New York. Furthermore, trading takes place in Japanese markets on
               certain Saturdays and in various foreign markets on days which
               are not business days in New York and on which the Fund's NAV is
               not calculated. The Fund calculates its NAV per share, and
               therefore effects sales, redemptions and repurchases of its
               shares, as of the close of the NYSE once on each day on which the
               NYSE is open. Such calculation may not take place
               contemporaneously with the determination of the prices of the
               foreign portfolio securities used in such calculation.
 
REINVESTMENT OF DIVIDENDS AND DISTRIBUTIONS
 
               If investors do not elect in writing or by phone to receive their
               dividends and distributions in cash, all income dividends and
               capital gains distributions, if any, on the Fund's shares are
               reinvested automatically in additional shares of the Fund at the
               NAV determined on the payment date. Checks for cash dividends and
               distributions and confirmations of reinvestments are usually
               mailed to shareholders within ten days after the record date. Any
               election of the manner in which a shareholder wishes to receive
               dividends and distributions (which may be made on the New Account
               Application form or by phone) will apply to dividends and
               distributions the record dates of which fall on or after the date
               that the Fund receives such notice. Changes to distribution
 
                                                                              53
<PAGE> 
 
               options must be received at least three days prior to the record
               date to be effective for such date. Investors receiving cash
               distributions and dividends may elect in writing or by phone to
               change back to automatic reinvestment at any time.
 
 54
<PAGE> 
Redemption of shares
 
               Procedures for redemption of shares are set forth in the
               Shareholder's Manual section of the Prospectus. Shares normally
               will be redeemed for cash, although the Fund retains the right to
               redeem its shares in kind under unusual circumstances, in order
               to protect the interests of remaining shareholders, by delivery
               of securities selected from its assets at its discretion.
               However, the Fund is governed by Rule 18f-1 under the 1940 Act,
               which requires the Fund to redeem shares solely in cash up to the
               lesser of $250,000 or 1% of the NAV of the Fund during any 90-day
               period for any one shareholder. Should redemptions by any
               shareholder exceed such limitation, the Fund will have the option
               of redeeming the excess in cash or in kind. If shares are
               redeemed in kind, the redeeming shareholder might incur brokerage
               costs in converting the assets to cash. The method of valuing
               securities used to make redemptions in kind will be the same as
               the method of valuing portfolio securities described under
               "Purchase of Shares D Net Asset Value Determination" and such
               valuation will be made as of the same time the redemption price
               is determined.
 
               The right to require the Fund to redeem its shares may be
               suspended, or the date of payment may be postponed, whenever (1)
               trading on the NYSE is restricted, as determined by the SEC, or
               the NYSE is closed except for holidays and weekends, (2) the SEC
               permits such suspension and so orders, or (3) an emergency exists
               as determined by the SEC so that disposal of securities or
               determination of NAV is not reasonably practicable.
 
                                                                              55
<PAGE> 
Shareholder accounts
 
               Detailed information about the general procedures for shareholder
               accounts and specific types of accounts is set forth in the
               Prospectus. Applications for specific types of accounts may be
               obtained by calling the Fund at 1-800-525-3713 or writing to the
               Fund at P.O. Box 173375, Denver, Colorado 80217-3375.
 
TELEPHONE TRANSACTIONS
 
               As stated in the Prospectus, shareholders may initiate a number
               of transactions by telephone. The Fund, its transfer agent and
               its distributor disclaim responsibility for the authenticity of
               instructions received by telephone. Such entities will employ
               reasonable procedures to confirm that instructions communicated
               by telephone are genuine. Such procedures may include, among
               others, requiring personal identification prior to acting upon
               telephone instructions, providing written confirmation of the
               transactions and tape recording telephone conversations.
 
SYSTEMATIC REDEMPTIONS
 
               As stated in the Shareholder's Manual section of the Prospectus,
               if you have a regular account or are eligible for distributions
               from a retirement plan, you may establish a systematic redemption
               option. The payments will be made from the proceeds of periodic
               redemptions of shares in the account at the NAV. Depending on the
               size or frequency of the disbursements requested, and the
               fluctuation in value of the Fund's portfolio, redemptions for the
               purpose of making such disbursements may reduce or even exhaust
               the shareholder's account. Either an investor or the Fund, by
               written notice to the other, may terminate the investor's
               systematic redemption option without penalty at any time.
 
               Information about requirements to establish a systematic
               redemption option may be obtained by writing or calling the Fund
               at the address or phone number shown above.
 
 56
<PAGE> 
Tax-deferred accounts
 
               The Fund offers several different types of tax-deferred accounts
               that an investor may establish to invest in Fund shares,
               depending on rules prescribed by the Code. Traditional and Roth
               Individual Retirement Accounts may be used by most individuals
               who have taxable compensation. Simplified Employee Pensions and
               Defined Contribution Plans (Profit Sharing or Money Purchase
               Pension Plans) may be used by most employers, including
               corporations, partnerships and sole proprietors, for the benefit
               of business owners and their employees. Education IRAs allow
               individuals, subject to certain income limitations, to contribute
               up to $500 annually on behalf of any child under the age of 18.
               In addition, the Fund offers a Section 403(b)(7) Plan for
               employees of educational organizations and other qualifying
               tax-exempt organizations. Investors should consult their tax
               adviser or legal counsel before selecting a tax-deferred account.
 
   
               Contributions under Traditional and Roth IRAs, Education IRAs,
               SEPs, Defined Contribution Plans and Section 403(b)(7) Plans are
               subject to specific contribution limitations. Generally, such
               contributions may be invested at the direction of the
               participant. The investment is then held by Investors Fiduciary
               Trust Company as custodian. Each participant's account is charged
               an annual fee of $12 per taxpayer identification number no matter
               how many tax-deferred accounts the participant has with Janus.
               The custodian reserves the right to change the amount of this fee
               or to waive it in whole or in part for certain types of accounts.
    
 
               Distributions from tax-deferred accounts may be subject to
               ordinary income tax and may be subject to an additional 10% tax
               if withdrawn prior to age 59 1/2 or used for a nonqualifying
               purpose. Additionally, shareholders generally must start
               withdrawing retirement plan assets no later than April 1 of the
               year after they reach age 70 1/2. Several exceptions to these
               general rules may apply and several methods exist to determine
               the amount and timing of the minimum annual distribution (if
               any). Shareholders should consult with their tax adviser or legal
               counsel prior to receiving any distribution from any tax-deferred
               account, in order to determine the income tax impact of any such
               distribution.
 
                                                                              57
<PAGE> 
 
               To receive additional information about Traditional and Roth
               IRAs, SEPs, Defined Contribution Plans and Section 403(b)(7)
               Plans along with the necessary materials to establish an account,
               please call the Fund at 1-800-525-3713 or write to the Fund at
               P.O. Box 173375, Denver, Colorado 80217-3375. No contribution to
               a Traditional or Roth IRA, SEP, Defined Contribution Plan or
               Section 403(b)(7) Plan can be made until the appropriate forms to
               establish any such plan have been completed.
 
 58
<PAGE> 
Income dividends, capital gains 
       distributions and tax status
 
               It is a policy of the Fund to make distributions of substantially
               all of its investment income and any net realized capital gains.
               Any capital gains realized during each fiscal year of the Fund
               ended October 31, as defined by the Code, are normally declared
               and payable to shareholders in December. The Fund intends to
               qualify as a regulated investment company by satisfying certain
               requirements prescribed by Subchapter M of the Code. Accordingly,
               the Fund will invest no more than 25% of its total assets in a
               single issuer (other than U.S. government securities).
 
               The Fund may purchase securities of certain foreign corporations
               considered to be passive foreign investment companies by the IRS.
               In order to avoid taxes and interest that must be paid by the
               Fund, if these instruments are profitable, the Fund may make
               various elections permitted by the tax laws. However, these
               elections could require that the Fund recognize taxable income,
               which in turn must be distributed.
 
               Some foreign securities purchased by the Fund may be subject to
               foreign taxes which could reduce the yield on such securities.
               The amount of such foreign taxes is expected to be insignificant.
               Accordingly, the Fund does not intend to make the election
               permitted under section 853 of the Code to pass through such
               taxes to shareholders as a foreign tax credit as this would
               increase the taxable income reported to shareholders and require
               shareholders to take the credit on their tax returns,
               complicating the preparation of such returns. As a result, any
               foreign taxes paid or accrued will represent an expense to the
               Fund which will reduce its investment company taxable income.
 
                                                                              59
<PAGE> 
Principal shareholders
 
   
               As of January 20, 1999, the officers and Trustees of the Fund as
               a group owned less than 1% of the outstanding shares of the Fund.
               In addition, as of January 20, 1999, the following shareholders
               owned more than 5% of the outstanding shares of the Fund:
    
   
<TABLE>
<CAPTION>
 
           Shareholder                         Address
- -----------------------------------------------------------------
<S>                                 <C>
Charles Schwab & Co., Inc.          101 Montgomery Street
                                    San Francisco, CA 94101-4122
Donaldson Lufkin & Jenrette         P.O. Box 2052
  Securities Corp.                  Jersey City, NJ 07303-2052
National Financial Services Co.     P.O. Box 3908
                                    Church Street Station
                                    New York, NY 10008-3908
 
<CAPTION>
                                    Percentage
           Shareholder              Ownership
<S>                                 <C>
Charles Schwab & Co., Inc.
                                                 33.27%
Donaldson Lufkin & Jenrette
                                                  5.22%
  Securities Corp.
National Financial Services Co.
                                                 13.44%
</TABLE>
    
 
   
               According to information provided by Charles Schwab & Co., Inc.
               and National Financial Services Co., this ownership is by nominee
               only and does not represent beneficial ownership of such shares,
               because they have no investment discretion or voting power with
               respect to such shares.
    
 
 60
<PAGE> 
Miscellaneous information
 
               The Fund is a series of the Trust, a Massachusetts business trust
               that was created on February 11, 1986. The Trust is an open-end
               management investment company registered under the 1940 Act. As
               of the date of this SAI, the Trust offers 21 separate series,
               three of which currently offer three classes of shares.
 
               Janus Capital reserves the right to the name "Janus." In the
               event that Janus Capital does not continue to provide investment
               advice to the Fund, the Fund must cease to use the name "Janus"
               as soon as reasonably practicable.
 
               Under Massachusetts law, shareholders of the Fund could, under
               certain circumstances, be held liable for the obligations of the
               Fund. However, the Declaration of Trust disclaims shareholder
               liability for acts or obligations of the Fund and requires that
               notice of this disclaimer be given in each agreement, obligation
               or instrument entered into or executed by the Fund or the
               Trustees. The Declaration of Trust also provides for
               indemnification from the assets of the Fund for all losses and
               expenses of any Fund shareholder held liable for the obligations
               of the Fund. Thus, the risk of a shareholder incurring a
               financial loss on account of its liability as a shareholder of
               the Fund is limited to circumstances in which the Fund would be
               unable to meet its obligations. The possibility that these
               circumstances would occur is remote. The Trustees intend to
               conduct the operations of the Fund to avoid, to the extent
               possible, liability of shareholders for liabilities of the Fund.
 
SHARES OF THE TRUST
 
               The Trust is authorized to issue an unlimited number of shares of
               beneficial interest with a par value of one cent per share for
               each series of the Trust. Shares of the Fund are fully paid and
               nonassessable when issued. All shares of the Fund participate
               equally in dividends and other distributions by the Fund, and in
               residual assets of the Fund in the event of liquidation. Shares
               of the Fund have no preemptive, conversion or subscription
               rights. Shares of the Fund may be transferred by endorsement or
               stock power as is customary, but the Fund is not bound to
               recognize any transfer until it is recorded on its books.
 
                                                                              61
<PAGE> 
 
SHAREHOLDER MEETINGS
 
               The Trust does not intend to hold annual shareholder meetings.
               However, special meetings may be called for a specific Fund or
               for the Trust as a whole for purposes such as electing or
               removing Trustees, terminating or reorganizing the Trust,
               changing fundamental policies, or for any other purpose requiring
               a shareholder vote under the 1940 Act. Separate votes are taken
               by the Fund only if a matter affects or requires the vote of only
               the Fund or the Fund's interest in the matter differs from the
               interest of other portfolios of the Trust. As a shareholder, you
               are entitled to one vote for each share that you own.
 
VOTING RIGHTS
 
               The present Trustees were elected at a meeting of shareholders
               held on July 10, 1992, with the exception of Mr. Craig and Mr.
               Rothe who were appointed by the Trustees as of June 30, 1995 and
               January 1, 1997, respectively. Under the Declaration of Trust,
               each Trustee will continue in office until the termination of the
               Trust or his earlier death, retirement, resignation, bankruptcy,
               incapacity or removal. Vacancies will be filled by a majority of
               the remaining Trustees, subject to the 1940 Act. Therefore, no
               annual or regular meetings of shareholders normally will be held,
               unless otherwise required by the Declaration of Trust or the 1940
               Act. Subject to the foregoing, shareholders have the power to
               vote to elect or remove Trustees, to terminate or reorganize the
               Fund, to amend the Declaration of Trust, to bring certain
               derivative actions and on any other matters on which a
               shareholder vote is required by the 1940 Act, the Declaration of
               Trust, the Trust's Bylaws or the Trustees.
 
               As mentioned above in "Shareholder Meetings," each share of the
               Fund and of each other series of the Trust has one vote (and
               fractional votes for fractional shares). Shares of all series of
               the Trust have noncumulative voting rights, which means that the
               holders of more than 50% of the shares of all series of the Trust
               voting for the election of Trustees can elect 100% of the
               Trustees if they choose to do so and, in such event, the holders
               of the remaining shares will not be able to elect any Trustees.
 
 62
<PAGE> 
 
MASTER/FEEDER OPTION
 
               The Trust may in the future seek to achieve the Fund's objective
               by investing all of the Fund's assets in another investment
               company having the same investment objective and substantially
               the same investment policies and restrictions as those applicable
               to the Fund. Unless otherwise required by law, this policy may be
               implemented by the Trustees without shareholder approval.
 
INDEPENDENT ACCOUNTANTS
 
               PricewaterhouseCoopers LLP, 950 Seventeenth Street, Suite 2500,
               Denver, Colorado 80202, independent accountants for the Fund,
               audit the Fund's annual financial statements and prepare its tax
               returns.
 
REGISTRATION STATEMENT
 
               The Trust has filed with the SEC, Washington, D.C., a
               Registration Statement under the Securities Act of 1933, as
               amended, with respect to the securities to which this SAI
               relates. If further information is desired with respect to the
               Fund or such securities, reference is made to the Registration
               Statement and the exhibits filed as a part thereof.
 
                                                                              63
<PAGE> 
Performance information
 
               Quotations of average annual total return for the Fund will be
               expressed in terms of the average annual compounded rate of
               return of a hypothetical investment in the Fund over periods of
               1, 5, and 10 years (up to the life of the Fund). These are the
               annual total rates of return that would equate the initial amount
               invested to the ending redeemable value. These rates of return
               are calculated pursuant to the following formula: P(1 + T)n = ERV
               (where P = a hypothetical initial payment of $1,000, T = the
               average annual total return, n = the number of years and
               ERV = the ending redeemable value of a hypothetical $1,000
               payment made at the beginning of the period). All total return
               figures reflect the deduction of a proportional share of Fund
               expenses on an annual basis, and assume that all dividends and
               distributions are reinvested when paid.
 
   
               The Fund was made available for public sale on May 2, 1994. The
               one year and lifetime average annual total returns, computed as
               of October 31, 1998, for each of those periods, are 3.55% and
               15.72%, respectively.
    
 
               From time to time in advertisements or sales material, the Fund
               may discuss its performance ratings or other information as
               published by recognized mutual fund statistical rating services,
               including, but not limited to, Lipper Analytical Services, Inc.,
               ("Lipper") Ibbotson Associates, Micropal or Morningstar, Inc.
               ("Morningstar") or by publications of general interest such as
               Forbes, Money, The Wall Street Journal, Mutual Funds Magazine,
               Kiplinger's or Smart Money. The Fund may also compare its
               performance to that of other selected mutual funds (for example,
               peer groups created by Lipper or Morningstar), mutual fund
               averages or recognized stock market indicators, including, but
               not limited to, the Morgan Stanley Capital International Europe,
               Australasia, Far East (EAFE Index) and the NASDAQ composite. In
               addition, the Fund may compare its total return to the yield on
               U.S. Treasury obligations and to the percentage change in the
               Consumer Price Index. Such performance ratings or comparisons may
               be made with funds that may have different investment
               restrictions, objectives, policies or techniques than the Fund
               and
 
 64
<PAGE> 
 
               such other funds or market indicators may be comprised of
               securities that differ significantly from the Fund's investments.
 
                                                                              65
<PAGE> 
Financial statements
 
   
               The following audited financial statements for the period ended
               October 31, 1998 are hereby incorporated into this SAI by
               reference to the Fund's Annual Report dated October 31, 1998.
    
 
DOCUMENTS INCORPORATED BY REFERENCE TO THE ANNUAL REPORT:
 
               Schedule of Investments as of October 31, 1998
 
               Statement of Operations for the period ended October 31, 1998
 
               Statement of Assets and Liabilities as of October 31, 1998
 
               Statements of Changes in Net Assets for the periods ended October
               31, 1998 and 1997
 
               Financial Highlights for each of the periods indicated
 
               Notes to Financial Statements
 
               Report of Independent Accountants
 
               The portions of such Annual Report that are not specifically
               listed above are not incorporated by reference into this SAI and
               are not part of the Registration Statement.
 
 66
<PAGE> 
Appendix A
 
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>
 
                                                                              67
<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>
 
 68
<PAGE> 
 
               Unrated securities will be treated as noninvestment grade
               securities unless the portfolio managers determine 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.
 
                                                                              69
<PAGE> 
 
        [JANUS LOGO]
                1-800-525-3713
                P.O. Box 173375
                Denver, Colorado 80217-3375
                janus.com
 
  3172
<PAGE> 
 
                                                                  [JANUS LOGO]
 
                    Janus Investment Fund
                    Janus Money Market Fund
                    Janus Government Money Market Fund
                    Janus Tax-Exempt Money Market Fund
                    Institutional Shares
 
                    100 Fillmore Street
                    Denver, CO 80206-4928
   
                    (800) 29JANUS
    
 
                    Statement of Additional Information
 
                    February 17, 1999
 
                    This Statement of Additional Information expands upon and
                    supplements the information contained in the current
                    Prospectus for the Institutional Shares (the "Shares") of
                    Janus Money Market Fund, Janus Government Money Market
                    Fund and Janus Tax-Exempt Money Market Fund. The Funds
                    are each a separate series of Janus Investment Fund, a
                    Massachusetts business trust.
 
                    This SAI is not a Prospectus and should be read in
                    conjunction with the Prospectus dated February 17, 1999,
                    which is incorporated by reference into this SAI and may
                    be obtained from the Trust at the above phone number or
                    address. This SAI contains additional and more detailed
                    information about the Funds' operations and activities
                    than the Prospectus. The Annual Report, which contains
                    important financial information about the Funds, is
                    incorporated by reference into this SAI and is also
                    available, without charge, at the above phone number or
                    address.
<PAGE> 
 
[JANUS LOGO]
<PAGE> 
 
                                                              Table of contents
 
<TABLE>
                <S>                                               <C>
                Investment Restrictions and Investment
                Strategies......................................    2
                Performance Data................................   18
                Investment Adviser and Administrator............   22
                Custodian, Transfer Agent and Certain
                Affiliations....................................   26
                Portfolio Transactions and Brokerage............   27
                Trustees and Officers...........................   30
                Purchase of Shares..............................   35
                Redemption of Shares............................   36
                Tax-Deferred Accounts...........................   37
                Shareholder Accounts............................   38
                Dividends and Tax Status........................   38
                Principal Shareholders..........................   40
                Miscellaneous Information.......................   41
                Financial Statements............................   44
                Appendix A - Description of Securities Ratings..   45
                Appendix B - Description of Municipal
                Securities......................................   49
</TABLE>
 
                                                                               1
<PAGE> 
Investment restrictions and 
           investment strategies
 
INVESTMENT RESTRICTIONS
 
               Each Fund has adopted certain fundamental investment restrictions
               that cannot be changed without shareholder approval. Shareholder
               approval means approval by the lesser of (i) more than 50% of the
               outstanding voting securities of the Trust (or a particular Fund
               or particular class of Shares if a matter affects just that Fund
               or that class of Shares), or (ii) 67% or more of the voting
               securities present at a meeting if the holders of more than 50%
               of the outstanding voting securities of the Trust (or a
               particular Fund or class of Shares) are present or represented by
               proxy.
 
               As used in the restrictions set forth below and as used elsewhere
               in this SAI, the term "U.S. Government Securities" shall have the
               meaning set forth in the 1940 Act. The 1940 Act defines U.S.
               Government Securities as securities issued or guaranteed by the
               United States government, its agencies or instrumentalities. U.S.
               Government Securities may also include repurchase agreements
               collateralized and municipal securities escrowed with or refunded
               with escrowed U.S. government securities.
 
               The Funds have adopted the following fundamental policies:
 
               (1) With respect to 75% of its assets, a Fund may not purchase a
               security other than a U.S. Government Security, if, as a result,
               more than 5% of the Fund's total assets would be invested in the
               securities of a single issuer or the Fund would own more than 10%
               of the outstanding voting securities of any single issuer. (As
               noted in the Prospectus, the Funds are also currently subject to
               the greater diversification standards of Rule 2a-7, which are not
               fundamental.)
 
               (2) A Fund may not purchase securities if 25% or more of the
               value of a Fund's total assets would be invested in the
               securities of issuers conducting their principal business
               activities in the same industry; provided that: (i) there is no
               limit on investments in U.S. Government Securities or in
               obligations of domestic commercial banks (including U.S. branches
               of foreign banks subject to regulations under U.S. laws
               applicable to domestic banks and, to the extent that its parent
               is unconditionally liable
 
 2
<PAGE> 
 
               for the obligation, foreign branches of U.S. banks); (ii) this
               limitation shall not apply to a Fund's investments in municipal
               securities; (iii) there is no limit on investments in issuers
               domiciled in a single country; (iv) financial service companies
               are classified according to the end users of their services (for
               example, automobile finance, bank finance and diversified finance
               are each considered to be a separate industry); and (v) utility
               companies are classified according to their services (for
               example, gas, gas transmission, electric, and telephone are each
               considered to be a separate industry).
 
               (3) A Fund may not act as an underwriter of securities issued by
               others, except to the extent that a Fund may be deemed an
               underwriter in connection with the disposition of portfolio
               securities of such Fund.
 
               (4) A Fund may not lend any security or make any other loan if,
               as a result, more than 25% of a Fund's total assets would be lent
               to other parties (but this limitation does not apply to purchases
               of commercial paper, debt securities or repurchase agreements).
 
               (5) A Fund may not purchase or sell real estate or any interest
               therein, except that the Fund may invest in debt obligations
               secured by real estate or interests therein or securities issued
               by companies that invest in real estate or interests therein.
 
               (6) A Fund may borrow money for temporary or emergency purposes
               (not for leveraging) in an amount not exceeding 25% of the value
               of its total assets (including the amount borrowed) less
               liabilities (other than borrowings). If borrowings exceed 25% of
               the value of a Fund's total assets by reason of a decline in net
               assets, the Fund will reduce its borrowings within three business
               days to the extent necessary to comply with the 25% limitation.
               Reverse repurchase agreements or the segregation of assets in
               connection with such agreements shall not be considered borrowing
               for the purposes of this limit.
 
               (7) Each Fund may, notwithstanding any other investment policy or
               restriction (whether or not fundamental), invest all of its
               assets
 
                                                                               3
<PAGE> 
 
               in the securities of a single open-end management investment
               company with substantially the same fundamental investment
               objectives, policies and restrictions as that Fund.
 
               Investment restriction (1) is intended to reflect the
               requirements under Section 5(b)(1) of the 1940 Act for a
               diversified fund. Rule 2a-7 provides that money market funds that
               comply with the diversification limits of Rule 2a-7 are deemed to
               comply with the diversification limits of Section 5(b)(1). Thus,
               the Funds interpret restriction (1) in accordance with Rule 2a-7.
               Accordingly, if securities are subject to a guarantee provided by
               a non-controlled person, the Rule 2a-7 diversification tests
               apply to the guarantor, and the diversification test in
               restriction (1) does not apply to the issuer.
 
               Each Fund has adopted the following nonfundamental investment
               restrictions that may be changed by the Trustees without
               shareholder approval:
 
               (1) A Fund may not invest in securities or enter into repurchase
               agreements with respect to any securities if, as a result, more
               than 10% of the Fund's net assets would be invested in repurchase
               agreements not entitling the holder to payment of principal
               within seven days and in other securities that are not readily
               marketable ("illiquid investments"). The Trustees, or the Fund's
               investment adviser acting pursuant to authority delegated by the
               Trustees, may determine that a readily available market exists
               for certain securities such as securities eligible for resale
               pursuant to Rule 144A under the Securities Act of 1933, or any
               successor to such rule, Section 4(2) commercial paper and
               municipal lease obligations. Accordingly, such securities may not
               be subject to the foregoing limitation.
 
               (2) A Fund may not purchase securities on margin, or make short
               sales of securities, except for short sales against the box and
               the use of short-term credit necessary for the clearance of
               purchases and sales of portfolio securities.
 
 4
<PAGE> 
 
               (3) A Fund may not pledge, mortgage, hypothecate or encumber any
               of its assets except to secure permitted borrowings or in
               connection with permitted short sales.
 
               (4) A Fund may not invest in companies for the purpose of
               exercising control of management.
 
               Under the terms of an exemptive order received from the
               Securities and Exchange Commission ("SEC"), each of the Funds may
               borrow money from or lend money to other funds that permit such
               transactions and for which Janus Capital serves as investment
               adviser. All such borrowing and lending will be subject to the
               above limits. A Fund will borrow money through the program only
               when the costs are equal to or lower than the costs of bank
               loans. Interfund loans and borrowings normally extend overnight,
               but can have a maximum duration of seven days. A Fund will lend
               through the program only when the returns are higher than those
               available from other short-term instruments (such as repurchase
               agreements). A Fund may have to borrow from a bank at a higher
               interest rate if an interfund loan is called or not renewed. Any
               delay in repayment to a lending Fund could result in a lost
               investment opportunity or additional borrowing costs.
 
               For purposes of the Funds' policies on investing in particular
               industries, the Funds will rely primarily on industry or industry
               group classifications published by Bloomberg L.P. To the extent
               that Bloomberg L.P. industry classifications are so broad that
               the primary economic characteristics in a single industry are
               materially different, the Funds may further classify issuers in
               accordance with industry classifications as published by the SEC.
 
                                                                               5
<PAGE> 
 
INVESTMENT STRATEGIES
 
               Each of the Funds may invest only in "eligible securities" as
               defined in Rule 2a-7 adopted under the 1940 Act. Generally, an
               eligible security is a security that (i) is denominated in U.S.
               dollars and has a remaining maturity of 397 days or less (as
               calculated pursuant to Rule 2a-7); (ii) is rated, or is issued by
               an issuer with short-term debt outstanding that is rated, in one
               of the two highest rating categories by any two nationally
               recognized statistical rating organizations ("NRSROs") or, if
               only one NRSRO has issued a rating, by that NRSRO (the "Requisite
               NRSROs") or is unrated and of comparable quality to a rated
               security, as determined by Janus Capital; and (iii) has been
               determined by Janus Capital to present minimal credit risks
               pursuant to procedures approved by the Trustees. In addition, the
               Funds will maintain a dollar-weighted average portfolio maturity
               of 90 days or less. A description of the ratings of some NRSROs
               appears in Appendix A.
 
               Under Rule 2a-7, a Fund may not invest more than five percent of
               its total assets in the securities of any one issuer other than
               U.S. Government Securities, provided that in certain cases a Fund
               may invest more than 5% of its assets in a single issuer for a
               period of up to three business days. Investment in demand
               features, guarantees, and other types of instruments or features
               are subject to the diversification limits under Rule 2a-7.
 
               Pursuant to Rule 2a-7, each Fund (except Janus Tax-Exempt Money
               Market Fund) will invest at least 95% of its total assets in
               "first-tier" securities. First-tier securities are eligible
               securities that are rated, or are issued by an issuer with
               short-term debt outstanding that is rated, in the highest rating
               category by the Requisite NRSROs or are unrated and of comparable
               quality to a rated security. In addition, a Fund may invest in
               "second-tier" securities which are eligible securities that are
               not first-tier securities. However, a Fund (except for Janus
               Tax-Exempt Money Market Fund, in certain cases) may not invest in
               a second-tier security if immediately after the acquisition
               thereof the Fund would have invested more than (i) the greater of
               one percent of
 
 6
<PAGE> 
 
               its total assets or one million dollars in second-tier securities
               issued by that issuer, or (ii) five percent of its total assets
               in second-tier securities.
 
               The following discussion of types of securities in which the
               Funds may invest supplements and should be read in conjunction
               with the Prospectus.
 
Participation Interests
 
               Each Fund may purchase participation interests in loans or
               securities in which the Funds may invest directly. Participation
               interests are generally sponsored or issued by banks or other
               financial institutions. A participation interest gives a Fund an
               undivided interest in the underlying loans or securities in the
               proportion that the Fund's interest bears to the total principal
               amount of the underlying loans or securities. Participation
               interests, which may have fixed, floating or variable rates, may
               carry a demand feature backed by a letter of credit or guarantee
               of a bank or institution permitting the holder to tender them
               back to the bank or other institution. For certain participation
               interests, a Fund will have the right to demand payment, on not
               more than seven days' notice, for all or a part of the Fund's
               participation interest. The Funds intend to exercise any demand
               rights they may have upon default under the terms of the loan or
               security, to provide liquidity or to maintain or improve the
               quality of the Funds' investment portfolio. A Fund will only
               purchase participation interests that Janus Capital determines
               present minimal credit risks.
 
Variable and Floating Rate Notes
 
               Janus Money Market Fund also may purchase variable and floating
               rate demand notes of corporations and other entities, which are
               unsecured obligations redeemable upon not more than 30 days'
               notice. These obligations include master demand notes that permit
               investment of fluctuating amounts at varying rates of interest
               pursuant to direct arrangements with the issuer of the
               instrument. The issuer of these obligations often has the right,
               after a given
 
                                                                               7
<PAGE> 
 
               period, to prepay the outstanding principal amount of the
               obligations upon a specified number of days' notice. These
               obligations generally are not traded, nor generally is there an
               established secondary market for these obligations. To the extent
               a demand note does not have a seven day or shorter demand feature
               and there is no readily available market for the obligation, it
               is treated as an illiquid investment.
 
               Securities with ultimate maturities of greater than 397 days may
               be purchased only pursuant to Rule 2a-7. Under that Rule, only
               those long-term instruments that have demand features which
               comply with certain requirements and certain variable rate U.S.
               Government Securities may be purchased. The rate of interest on
               securities purchased by a Fund may be tied to short-term Treasury
               or other government securities or indices on securities that are
               permissible investments of the Funds, as well as other money
               market rates of interest. The Funds will not purchase securities
               whose values are tied to interest rates or indices that are not
               appropriate for the duration and volatility standards of a money
               market fund.
 
Mortgage- and Asset-Backed Securities
 
               The Funds may invest in mortgage-backed securities, which
               represent an interest in a pool of mortgages made by lenders such
               as commercial banks, savings and loan institutions, mortgage
               bankers, mortgage brokers and savings banks. Mortgage-backed
               securities may be issued by governmental or government-related
               entities or by non-governmental entities such as banks, savings
               and loan institutions, private mortgage insurance companies,
               mortgage bankers and other secondary market issuers.
 
               Interests in pools of mortgage-backed securities differ from
               other forms of debt securities which normally provide for
               periodic payment of interest in fixed amounts with principal
               payments at maturity or specified call dates. In contrast,
               mortgage-backed securities provide periodic payments which
               consist of interest and, in most cases, principal. In effect,
               these payments are a "pass-through" of the periodic payments and
               optional prepayments made by the individual borrowers on their
               mortgage loans, net of
 
 8
<PAGE> 
 
               any fees paid to the issuer or guarantor of such securities.
               Additional payments to holders of mortgage-backed securities are
               caused by prepayments resulting from the sale of the underlying
               residential property, refinancing or foreclosure, net of fees or
               costs which may be incurred.
 
               As prepayment rates of individual pools of mortgage loans vary
               widely, it is not possible to predict accurately the average life
               of a particular security. Although mortgage-backed securities are
               issued with stated maturities of up to forty years, unscheduled
               or early payments of principal and interest on the underlying
               mortgages may shorten considerably the effective maturities.
               Mortgage-backed securities may have varying assumptions for
               average life. The volume of prepayments of principal on a pool of
               mortgages underlying a particular security will influence the
               yield of that security, and the principal returned to a Fund may
               be reinvested in instruments whose yield may be higher or lower
               than that which might have been obtained had the prepayments not
               occurred. When interest rates are declining, prepayments usually
               increase, with the result that reinvestment of principal
               prepayments will be at a lower rate than the rate applicable to
               the original mortgage-backed security.
 
               The Funds may invest in mortgage-backed securities that are
               issued by agencies or instrumentalities of the U.S. government.
               The Government National Mortgage Association ("GNMA") is the
               principal federal government guarantor of mortgage-backed
               securities. GNMA is a wholly-owned U.S. government corporation
               within the Department of Housing and Urban Development. GNMA
               Certificates are debt securities which represent an interest in
               one mortgage or a pool of mortgages which are insured by the
               Federal Housing Administration or the Farmers Home Administration
               or are guaranteed by the Veterans Administration. The Funds may
               also invest in pools of conventional mortgages which are issued
               or guaranteed by agencies of the U.S. government. GNMA
               pass-through securities are considered to be riskless with
               respect to default in that (i) the underlying mortgage loan
               portfolio is comprised entirely of government-backed loans and
               (ii) the timely
 
                                                                               9
<PAGE> 
 
               payment of both principal and interest on the securities is
               guaranteed by the full faith and credit of the U.S. government,
               regardless of whether or not payments have been made on the
               underlying mortgages. GNMA pass-through securities are, however,
               subject to the same market risk as comparable debt securities.
               Therefore, the market value of a Fund's GNMA securities can be
               expected to fluctuate in response to changes in prevailing
               interest rate levels.
 
               Residential mortgage loans are pooled also by the Federal Home
               Loan Mortgage Corporation ("FHLMC"). FHLMC is a privately
               managed, publicly chartered agency created by Congress in 1970
               for the purpose of increasing the availability of mortgage credit
               for residential housing. FHLMC issues participation certificates
               ("PCs") which represent interests in mortgages from FHLMC's
               national portfolio. The mortgage loans in FHLMC's portfolio are
               not U.S. government backed; rather, the loans are either
               uninsured with loan-to-value ratios of 80% or less, or privately
               insured if the loan-to-value ratio exceeds 80%. FHLMC guarantees
               the timely payment of interest and ultimate collection of
               principal on FHLMC PCs; the U.S. government does not guarantee
               any aspect of FHLMC PCs.
 
               The Federal National Mortgage Association ("FNMA") is a
               government-sponsored corporation owned entirely by private
               shareholders. It is subject to general regulation by the
               Secretary of Housing and Urban Development. FNMA purchases
               residential mortgages from a list of approved seller/servicers
               which include savings and loan associations, savings banks,
               commercial banks, credit unions and mortgage bankers. FNMA
               guarantees the timely payment of principal and interest on the
               pass-through securities issued by FNMA; the U.S. government does
               not guarantee any aspect of the FNMA pass-through securities.
 
               The Funds may also invest in privately-issued mortgage-backed
               securities to the extent permitted by their investment
               restrictions. Mortgage-backed securities offered by private
               issuers include pass-through securities comprised of pools of
               conventional residential mortgage loans; mortgage-backed bonds
               which are considered to
 
 10
<PAGE> 
 
               be debt obligations of the institution issuing the bonds and
               which are collateralized by mortgage loans; and collateralized
               mortgage obligations ("CMOs") which are collateralized by
               mortgage-backed securities issued by GNMA, FHLMC or FNMA or by
               pools of conventional mortgages.
 
               Asset-backed securities represent direct or indirect
               participations in, or are secured by and payable from, assets
               other than mortgage-backed assets such as motor vehicle
               installment sales contracts, installment loan contracts, leases
               of various types of real and personal property and receivables
               from revolving credit agreements (credit cards). Asset-backed
               securities have yield characteristics similar to those of
               mortgage-backed securities and, accordingly, are subject to many
               of the same risks.
 
Reverse Repurchase Agreements
 
               Reverse repurchase agreements are transactions in which a Fund
               sells a security and simultaneously commits to repurchase that
               security from the buyer at an agreed upon price on an agreed upon
               future date. The resale price in a reverse repurchase agreement
               reflects a market rate of interest that is not related to the
               coupon rate or maturity of the sold security. For certain demand
               agreements, there is no agreed upon repurchase date and interest
               payments are calculated daily, often based upon the prevailing
               overnight repurchase rate. The Funds will use the proceeds of
               reverse repurchase agreements only to satisfy unusually heavy
               redemption requests or for other temporary or emergency purposes
               without the necessity of selling portfolio securities.
 
               Generally, a reverse repurchase agreement enables the Fund to
               recover for the term of the reverse repurchase agreement all or
               most of the cash invested in the portfolio securities sold and to
               keep the interest income associated with those portfolio
               securities. Such transactions are only advantageous if the
               interest cost to the Fund of the reverse repurchase transaction
               is less than the cost of obtaining the cash otherwise. In
               addition, interest costs on the money received in a reverse
               repurchase agreement may exceed the
 
                                                                              11
<PAGE> 
 
               return received on the investments made by a Fund with those
               monies.
 
When-Issued and Delayed Delivery Securities
 
               Each Fund may purchase securities on a when-issued or delayed
               delivery basis. A Fund will enter into such transactions only
               when it has the intention of actually acquiring the securities.
               To facilitate such acquisitions, the Funds' custodian will
               segregate cash or high quality liquid assets in an amount at
               least equal to such commitments. On delivery dates for such
               transactions, the Fund will meet its obligations from maturities,
               sales of the segregated securities or from other available
               sources of cash. If a Fund chooses to dispose of the right to
               acquire a when-issued security prior to its acquisition, it
               could, as with the disposition of any other portfolio obligation,
               incur a gain or loss due to market fluctuation. At the time a
               Fund makes the commitment to purchase securities on a when-issued
               or delayed delivery basis, it will record the transaction as a
               purchase and thereafter reflect the value of such securities in
               determining its net asset value.
 
Investment Company Securities
 
               From time to time, the Funds may invest in securities of other
               investment companies. The Funds are subject to the provisions of
               Section 12(d)(1) of the 1940 Act. Funds managed by Janus Capital
               ("Janus Funds") may invest in securities of the Funds and any
               other money market funds managed by Janus Capital in excess of
               the limitations of Section 12(d)(1) under the terms of an SEC
               exemptive order obtained by Janus Capital and the Janus Funds.
 
Debt Obligations
 
               Janus Money Market Fund may invest in debt obligations of
               domestic issuers. In general, sales of these securities may not
               be made absent registration under the Securities Act of 1933 or
               the availability of an appropriate exemption. Pursuant to Section
               4(2) of the 1933 Act or Rule 144A adopted under the 1933 Act,
               however, some of these securities are eligible for resale to
               institutional investors, and accordingly, Janus Capital may
               deter-
 
 12
<PAGE> 
 
               mine that a liquid market exists for such a security pursuant to
               guidelines adopted by the Trustees.
 
Obligations of Financial Institutions
 
               Janus Money Market Fund may invest in obligations of financial
               institutions. Examples of obligations in which the Fund may
               invest include negotiable certificates of deposit, bankers'
               acceptances, time deposits and other obligations of U.S. banks
               (including savings and loan associations) having total assets in
               excess of one billion dollars and U.S. branches of foreign banks
               having total assets in excess of ten billion dollars. The Fund
               may also invest in Eurodollar and Yankee bank obligations as
               discussed below and other U.S. dollar-denominated obligations of
               foreign banks having total assets in excess of ten billion
               dollars that Janus Capital believes are of an investment quality
               comparable to obligations of U.S. banks in which the Fund may
               invest.
 
               Certificates of deposit represent an institution's obligation to
               repay funds deposited with it that earn a specified interest rate
               over a given period. Bankers' acceptances are negotiable
               obligations of a bank to pay a draft which has been drawn by a
               customer and are usually backed by goods in international trade.
               Time deposits are non-negotiable deposits with a banking
               institution that earn a specified interest rate over a given
               period. Fixed time deposits, which are payable at a stated
               maturity date and bear a fixed rate of interest, generally may be
               withdrawn on demand by the Fund but may be subject to early
               withdrawal penalties and that could reduce the Fund's yield.
               Unless there is a readily available market for them, time
               deposits that are subject to early withdrawal penalties and that
               mature in more than seven days will be treated as illiquid
               securities.
 
               Eurodollar bank obligations are dollar-denominated certificates
               of deposit or time deposits issued outside the U.S. capital
               markets by foreign branches of U.S. banks and by foreign banks.
               Yankee bank obligations are dollar-denominated obligations issued
               in the U.S. capital markets by foreign banks.
 
                                                                              13
<PAGE> 
 
               Foreign, Eurodollar (and to a limited extent, Yankee) bank
               obligations are subject to certain sovereign risks. One such risk
               is the possibility that a foreign government might prevent
               dollar-denominated funds from flowing across its borders. Other
               risks include: adverse political and economic developments in a
               foreign country; the extent and quality of government regulation
               of financial markets and institutions; the imposition of foreign
               withholding taxes; and exploration or nationalization of foreign
               issuers.
 
U.S. Government Securities
 
               Janus Government Money Market Fund and to a lesser extent, Janus
               Money Market Fund, invest in U.S. Government Securities. U.S.
               Government Securities shall have the meaning set forth in the
               1940 Act. The 1940 Act defines U.S. Government Securities to
               include securities issued or guaranteed by the U.S. Government,
               its agencies and instrumentalities. U.S. Government Securities
               may also include repurchase agreements collateralized by and
               municipal securities escrowed with or refunded with U.S.
               government securities. U.S. Government Securities in which the
               Fund may invest include U.S. Treasury securities and obligations
               issued or guaranteed by U.S. government agencies and
               instrumentalities that are backed by the full faith and credit of
               the U.S. government, such as those guaranteed by the Small
               Business Administration or issued by the Government National
               Mortgage Association. In addition, U.S. Government Securities in
               which the Fund may invest include securities supported primarily
               or solely by the creditworthiness of the issuer, such as
               securities of the Federal National Mortgage Association, the
               Federal Home Loan Mortgage Corporation and the Tennessee Valley
               Authority. There is no guarantee that the U.S. government will
               support securities not backed by its full faith and credit.
               Accordingly, although these securities have historically involved
               little risk of loss of principal if held to maturity, they may
               involve more risk than securities backed by the full faith and
               credit of the U.S. government.
 
 14
<PAGE> 
 
Municipal Securities
 
               The municipal securities in which Janus Tax-Exempt Money Market
               Fund may invest include municipal notes and short-term municipal
               bonds. Municipal notes are generally used to provide for the
               issuer's short-term capital needs and generally have maturities
               of 397 days or less. Examples include tax anticipation and
               revenue anticipation notes, which generally are issued in
               anticipation of various seasonal revenues, bond anticipation
               notes, construction loan notes and tax-exempt commercial paper.
               Short-term municipal bonds may include "general obligation
               bonds," which are secured by the issuer's pledge of its faith,
               credit and taxing power for payment of principal and interest;
               "revenue bonds," which are generally paid from the revenues of a
               particular facility or a specific excise tax or other source; and
               "industrial development bonds," which are issued by or on behalf
               of public authorities to provide funding for various privately
               operated industrial and commercial facilities. The Fund may also
               invest in high quality participation interests in municipal
               securities. A more detailed description of various types of
               municipal securities is contained in Appendix B.
 
               When the assets and revenues of an agency, authority,
               instrumentality or other political subdivision are separate from
               those of the government creating the issuing entity and a
               security is backed only by the assets and revenues of the issuing
               entity, that entity will be deemed to be the sole issuer of the
               security. Similarly, in the case of an industrial development
               bond backed only by the assets and revenues of the
               non-governmental issuer, the non-governmental issuer will be
               deemed to be the sole issuer of the bond.
 
Municipal Leases
 
               Janus Money Market Fund and Janus Tax-Exempt Money Market Fund
               may invest in municipal leases. Municipal leases are municipal
               securities which may take the form of a lease or an installment
               purchase or conditional sales contract. Municipal leases are
               issued by state and local governments and authorities to
 
                                                                              15
<PAGE> 
 
               acquire a wide variety of equipment and facilities. Municipal
               leases frequently have special risks not normally associated with
               general obligation or revenue bonds. Leases and installment
               purchase or conditional sale contracts (which normally provide
               for title to the leased asset to pass eventually to the
               government issuer) have evolved as a means for governmental
               issuers to acquire property and equipment without meeting the
               constitutional and statutory requirements for the issuance of
               debt. The debt-issuance limitations of many state constitutions
               and statutes are deemed to be inapplicable because of the
               inclusion in many leases or contracts of "non-appropriation"
               clauses that provide that the governmental issuer has no
               obligation to make future payments under the lease or contract
               unless money is appropriated for such purpose by the appropriate
               legislative body on a yearly or other periodic basis. A Fund will
               only purchase municipal leases subject to a non-appropriation
               clause when the payment of principal and accrued interest is
               backed by an unconditional irrevocable letter of credit, or
               guarantee of a bank or other entity that meets the criteria
               described in the Prospectus under "Taxable Investments."
 
               In evaluating municipal lease obligations, Janus Capital will
               consider such factors as it deems appropriate, including: (a)
               whether the lease can be canceled; (b) the ability of the lease
               obligee to direct the sale of the underlying assets; (c) the
               general creditworthiness of the lease obligor; (d) the likelihood
               that the municipality will discontinue appropriating funding for
               the leased property in the event such property is no longer
               considered essential by the municipality; (e) the legal recourse
               of the lease obligee in the event of such a failure to
               appropriate funding; (f) whether the security is backed by a
               credit enhancement such as insurance; and (g) any limitations
               which are imposed on the lease obligor's ability to utilize
               substitute property or services other than those covered by the
               lease obligation. If a lease is backed by an unconditional letter
               of credit or other unconditional credit enhancement, then Janus
               Capital may determine that a lease is an eligible security solely
               on the basis of its evaluation of the credit enhancement.
 
 16
<PAGE> 
 
               Municipal leases, like other municipal debt obligations, are
               subject to the risk of non-payment. The ability of issuers of
               municipal leases to make timely lease payments may be adversely
               impacted in general economic downturns and as relative
               governmental cost burdens are allocated and reallocated among
               federal, state and local governmental units. Such non-payment
               would result in a reduction of income to the Funds, and could
               result in a reduction in the value of the municipal lease
               experiencing non-payment and a potential decrease in the net
               asset value of a Fund.
 
                                                                              17
<PAGE> 
Performance data
 
               A Fund may provide current annualized and effective annualized
               yield quotations based on its daily dividends. These quotations
               may from time to time be used in advertisements, shareholder
               reports or other communications to shareholders. All performance
               information supplied by the Funds in advertising is historical
               and is not intended to indicate future returns.
 
               In performance advertising, the Funds may compare their Shares'
               performance information with data published by independent
               evaluators such as Morningstar, Inc., Lipper Analytical Services,
               Inc., or CDC/Wiesenberger, IBC/Donoghue's Money Fund Report or
               other companies which track the investment performance of
               investment companies ("Fund Tracking Companies"). The Funds may
               also compare their Shares' performance information with the
               performance of recognized stock, bond and other indices,
               including but not limited to the Municipal Bond Buyers Indices,
               the Salomon Brothers Bond Index, the Lehman Bond Index, the
               Standard & Poor's 500 Composite Stock Price Index, the Dow Jones
               Industrial Average, U.S. Treasury bonds, bills or notes and
               changes in the Consumer Price Index as published by the U.S.
               Department of Commerce. The Funds may refer to general market
               performance over past time periods such as those published by
               Ibbotson Associates (for instance, its "Stocks, Bonds, Bills and
               Inflation Yearbook"). The Funds may also refer in such materials
               to mutual fund performance rankings and other data published by
               Fund Tracking Companies. Performance advertising may also refer
               to discussions of the Funds and comparative mutual fund data and
               ratings reported in independent periodicals, such as newspapers
               and financial magazines. The Funds may also compare the Shares'
               yield to those of certain U.S. Treasury obligations or other
               money market instruments.
 
               Any current yield quotation of the Shares which is used in such a
               manner as to be subject to the provisions of Rule 482(d) under
               the Securities Act of 1933, as amended, shall consist of an
               annualized historical yield, carried at least to the nearest
               hundredth of one percent, based on a specific seven calendar day
               period. Current yield shall be calculated by (a) determining the
               net change during a seven calendar day period in the value of a
 
 18
<PAGE> 
 
               hypothetical account having a balance of one Share at the
               beginning of the period, (b) dividing the net change by the value
               of the account at the beginning of the period to obtain a base
               period return, and (c) multiplying the quotient by 365/7 (i.e.,
               annualizing). For this purpose, the net change in account value
               will reflect the value of additional Shares purchased with
               dividends declared on the original Share and dividends declared
               on both the original Share and any such additional Shares, but
               will not reflect any realized gains or losses from the sale of
               securities or any unrealized appreciation or depreciation on
               portfolio securities. In addition, the Shares may advertise
               effective yield quotations. Effective yield quotations are
               calculated by adding 1 to the base period return, raising the sum
               to a power equal to 365/7, and subtracting 1 from the result
               (i.e., compounding).
 
               Janus Tax-Exempt Money Market Fund's tax equivalent yield is the
               rate an investor would have to earn from a fully taxable
               investment in order to equal such Shares' yield after taxes. Tax
               equivalent yields are calculated by dividing Janus Tax-Exempt
               Money Market Fund's yield by one minus the stated federal or
               combined federal and state tax rate. If only a portion of the
               Shares' yield is tax-exempt, only that portion is adjusted in the
               calculation.
 
               The Shares' current yield and effective yield for the seven-day
               period ended October 31, 1998 is shown below:
 
   
<TABLE>
<CAPTION>
                                                         Seven-day         Effective
                       Fund Name                           Yield        Seven-day Yield
- ---------------------------------------------------------------------------------------
<S>                                                      <C>            <C>
Janus Money Market Fund - Institutional Shares             5.33%             5.47%
Janus Government Money Market Fund - Institutional
  Shares                                                   5.15%             5.29%
Janus Tax-Exempt Money Market Fund - Institutional
  Shares*                                                  3.35%             3.40%
</TABLE>
    
 
   
*Janus Tax-Exempt Money Market Fund Institutional Shares' tax-equivalent yield
 for the seven-day period ended October 31, 1998 was 4.65%.
    
 
                                                                              19
<PAGE> 
 
               Although published yield information is useful to investors in
               reviewing a Fund's performance, investors should be aware that
               the Fund's yield fluctuates from day to day and that the Fund's
               yield for any given period is not an indication or representation
               by the Fund of future yields or rates of return on the Shares.
               Also, processing organizations or other institutions may charge
               their customers direct fees in connection with an investment in a
               Fund, which will have the effect of reducing the Fund's net yield
               to those shareholders. The yield on a class of Shares is not
               fixed or guaranteed, and an investment in the Shares is not
               insured. Accordingly, yield information may not necessarily be
               used to compare Shares with investment alternatives which, like
               money market instruments or bank accounts, may provide a fixed
               rate of interest. In addition, because investments in the Funds
               are not insured or guaranteed, yield on the Shares may not
               necessarily be used to compare the Shares with investment
               alternatives which are insured or guaranteed.
 
DETERMINATION OF NET ASSET VALUE
 
               Pursuant to the rules of the SEC, the Trustees have established
               procedures to stabilize each Fund's net asset value at $1.00 per
               Share. These procedures include a review of the extent of any
               deviation of net asset value per Share as a result of fluctuating
               interest rates, based on available market rates, from the Fund's
               $1.00 amortized cost price per Share. Should that deviation
               exceed 1/2 of 1%, the Trustees will consider whether any action
               should be initiated to eliminate or reduce material dilution or
               other unfair results to shareholders. Such action may include
               redemption of Shares in kind, selling portfolio securities prior
               to maturity, reducing or withholding dividends and utilizing a
               net asset value per Share as determined by using available market
               quotations. Each Fund (i) will maintain a dollar-weighted average
               portfolio maturity of 90 days or less; (ii) will not purchase any
               instrument with a remaining maturity greater than 397 days or
               subject to a repurchase agreement having a duration of greater
               than 397 days; (iii) will limit portfolio investments, including
               repurchase agreements, to those U.S. dollar-denominated
               instruments that Janus Capital has determined present minimal
               credit
 
 20
<PAGE> 
 
               risks pursuant to procedures established by the Trustees; and
               (iv) will comply with certain reporting and recordkeeping
               procedures. The Trust has also established procedures to ensure
               that portfolio securities meet the Funds' high quality criteria.
 
                                                                              21
<PAGE> 
Investment adviser and 
           administrator
 
   
               As stated in the Prospectus, each Fund has an Investment Advisory
               Agreement with Janus Capital, 100 Fillmore Street, Denver,
               Colorado 80206-4928. Each Advisory Agreement provides that Janus
               Capital will furnish continuous advice and recommendations
               concerning the Funds' investments. The Funds have each agreed to
               compensate Janus Capital for its advisory services by the monthly
               payment of an advisory fee at the annual rate of .20% of the
               average daily net assets of each Fund. However, Janus Capital has
               agreed to waive .10% of the value of each Fund's average daily
               net assets of the advisory fee. Janus Capital has agreed to
               continue such waivers until at least the next annual renewal of
               the advisory agreements. In addition, the Funds pay brokerage
               commissions or dealer spreads and other expenses in connection
               with the execution of portfolio transactions.
    
 
   
               On behalf of the Shares, each of the Funds has also entered into
               an Administration Agreement with Janus Capital. Under the terms
               of the Administration Agreements, each of the Funds has agreed to
               compensate Janus Capital for administrative services at the
               annual rate of .15% of the value of the average daily net assets
               of the Shares for certain services, including custody, transfer
               agent fees and expenses, legal fees not related to litigation,
               accounting expenses, net asset value determination and fund
               accounting, recordkeeping, and blue sky registration and
               monitoring services, registration fees, expenses of shareholders'
               meetings and reports to shareholders, costs of preparing,
               printing and mailing the Shares' Prospectuses and Statements of
               Additional Information to current shareholders, and other costs
               of complying with applicable laws regulating the sale of Shares.
               Each Fund will pay those expenses not assumed by Janus Capital,
               including interest and taxes, fees and expenses of Trustees who
               are not affiliated with Janus Capital, audit fees and expenses,
               and extraordinary costs. Janus Capital has agreed to waive a
               portion of the administration fee, and accordingly the effective
               rate for calculating the administration fee payable by the Shares
               will be .05%. Janus Capital has agreed to continue such waivers
               until at least the next annual renewal of the advisory
               agreements.
    
 
 22
<PAGE> 
 
               The following table summarizes the advisory fees paid by the
               Funds for the fiscal years ended October 31:
 
   
<TABLE>
<CAPTION>
                                 1998                      1997                      1996
                        -----------------------   -----------------------   -----------------------
                         Advisory     Advisory     Advisory     Advisory     Advisory     Advisory
                        Fees Prior   Fees After   Fees Prior   Fees After   Fees Prior   Fees After
      Fund Name         to Waiver      Waiver     to Waiver      Waiver     to Waiver      Waiver
- ---------------------------------------------------------------------------------------------------
<S>                     <C>          <C>          <C>          <C>          <C>          <C>
Janus Money Market
  Fund                  $9,548,370   $4,774,185   $6,858,596   $3,429,298   $3,101,530   $1,550,765
Janus Government Money
  Market Fund             $944,654     $472,327     $362,308     $181,154     $330,914     $165,457
Janus Tax-Exempt Money
  Market Fund             $226,264     $113,132     $158,812      $79,406     $140,898      $70,449
</TABLE>
    
 
(1) February 15, 1995 (inception of Funds) to October 31, 1995.
 
               The following table summarizes the administration fees paid by
               the Shares for the fiscal years ended October 31:
 
   
<TABLE>
<CAPTION>
                                   1998                      1997                      1996
                          -----------------------   -----------------------   -----------------------
                            Admin-       Admin-       Admin-       Admin-       Admin-       Admin-
                          istration    istration    istration    istration    istration    istration
                          Fees Prior   Fees After   Fees Prior   Fees After   Fees Prior   Fees After
       Fund Name          to Waiver      Waiver     to Waiver      Waiver     to Waiver      Waiver
- -----------------------------------------------------------------------------------------------------
<S>                       <C>          <C>          <C>          <C>          <C>          <C>
Janus Money Market
  Fund - Institutional
  Shares                  $5,431,308   $1,810,436   $3,818,091   $1,272,697   $1,311,645    $437,215
Janus Government Money
  Market Fund -
  Institutional Shares      $481,760     $160,587      $85,227      $28,409      $80,097      $26,699
Janus Tax-Exempt Money
  Market Fund -
  Institutional Shares       $28,289       $9,430       $5,199       $1,733       $2,631         $877
</TABLE>
    
 
               Advisory fees are paid on the Fund level while administration
               fees are paid on the class level.
 
               The Advisory Agreements for each Fund were reexecuted on July 1,
               1997 (without amendment other than effective dates) and will
               continue in effect until July 1, 1999, and thereafter from year
               to year so long as such continuance is approved annually by a
               majority of the Trustees who are not parties to the Advisory
 
                                                                              23
<PAGE> 
 
               Agreements or interested persons of any such party, and by either
               a majority of the Funds' outstanding voting shares or the
               Trustees. Each Advisory Agreement (i) may be terminated without
               the payment of any penalty by any Fund or Janus Capital on 60
               days' written notice; (ii) terminates automatically in the event
               of its assignment; and (iii) generally, may not be amended
               without the approval of a majority of the Trustees of the
               affected Fund, including the Trustees who are not interested
               persons of that Fund or Janus Capital and, to the extent required
               by the 1940 Act, the vote of a majority of the outstanding voting
               securities of that Fund.
 
               Janus Capital also acts as sub-adviser for a number of
               private-label mutual funds and provides separate account advisory
               services for institutional accounts. Investment decisions for
               each account managed by Janus Capital, including the Funds, are
               made independently from those for any other account that is or
               may in the future become managed by Janus Capital or its
               affiliates. If, however, a number of accounts managed by Janus
               Capital are contemporaneously engaged in the purchase or sale of
               the same security, the orders may be aggregated and/or the
               transactions may be averaged as to price and allocated equitably
               to each account. In some cases, this policy might adversely
               affect the price paid or received by an account or the size of
               the position obtained or liquidated for an account. Pursuant to
               an exemptive order granted by the SEC, the Funds and other funds
               advised by Janus Capital may also transfer daily uninvested cash
               balances into one or more joint trading accounts. Assets in the
               joint trading accounts are invested in money market instruments
               and the proceeds are allocated to the participating funds on a
               pro rata basis.
 
               Kansas City Southern Industries, Inc. ("KCSI") owns approximately
               82% of the outstanding voting stock of Janus Capital, most of
               which it acquired in 1984. KCSI is a publicly traded holding
               company whose primary subsidiaries are engaged in transportation,
               information processing and financial services. Thomas H. Bailey,
               President and Chairman of the Board of Janus Capital, owns
               approximately 12% of its voting stock and, by agreement with
               KCSI, selects a majority of Janus Capital's Board.
 
 24
<PAGE> 
 
               KCSI has announced its intention to separate its transportation
               and financial services businesses. KCSI is currently studying
               alternatives for completion of the separation that meet its
               business objectives without risking adverse tax consequences.
               KCSI expects completion of the separation to be contemplated in
               1999.
 
               Each account managed by Janus Capital has its own investment
               objective and is managed in accordance with that objective by a
               particular portfolio manager or team of portfolio managers. As a
               result, from time to time two or more different managed accounts
               may pursue divergent investment strategies with respect to
               investments or categories of investments.
 
               Janus Capital does not permit portfolio managers to purchase and
               sell securities for their own accounts except under the limited
               exceptions contained in Janus Capital's policy regarding personal
               investing by directors, officers and employees of Janus Capital
               and the Funds. The policy requires investment personnel and
               officers of Janus Capital, inside directors of Janus Capital and
               the Funds and other designated persons deemed to have access to
               current trading information to pre-clear all transactions in
               securities not otherwise exempt under the policy. Requests for
               trading authority will be denied when, among other reasons, the
               proposed personal transaction would be contrary to the provisions
               of the policy or would be deemed to adversely affect any
               transaction then known to be under consideration for or to have
               been effected on behalf of any client account, including the
               Funds.
 
               In addition to the pre-clearance requirement described above, the
               policy subjects investment personnel, officers and directors/
               Trustees of Janus Capital and the Funds to various trading
               restrictions and reporting obligations. All reportable
               transactions are required to be reviewed for compliance with
               Janus Capital's policy. Those persons also may be required under
               certain circumstances to forfeit their profits made from personal
               trading.
 
               The provisions of the policy are administered by and subject to
               exceptions authorized by Janus Capital.
 
                                                                              25
<PAGE> 
Custodian, transfer agent and 
           certain affiliations
 
               UMB Bank, N.A. ("UMB"), P.O. Box 419226, Kansas City, Missouri
               64141-6226, is the Funds' current custodian. However, it is
               expected that Citibank, N.A., 111 Wall Street 24th Floor, Zone 5,
               New York, NY 10043, will replace UMB as custodian for the Funds
               in the first quarter of 1999. The custodian holds the Funds'
               assets in safekeeping and collects and remits the income thereon,
               subject to the instructions of each Fund.
 
               Janus Service Corporation, P.O. Box 173375, Denver, Colorado
               80217-3375, a wholly-owned subsidiary of Janus Capital, is the
               Funds' transfer agent. In addition, Janus Service provides
               certain other administrative, recordkeeping and shareholder
               relations services to the Funds. The Funds do not pay Janus
               Service a fee.
 
               Janus Distributors, Inc., 100 Fillmore Street, Denver, Colorado
               80206-4928, a wholly-owned subsidiary of Janus Capital, is a
               distributor of the Funds. Janus Distributors is registered as a
               broker-dealer under the Securities Exchange Act of 1934 and is a
               member of the National Association of Securities Dealers, Inc.
               Janus Distributors acts as the agent of the Funds in connection
               with the sale of their shares in all states in which the shares
               are registered and in which Janus Distributors is qualified as a
               broker-dealer. Under the Distribution Agreement, Janus
               Distributors continuously offers the Funds' shares and accepts
               orders at net asset value. No sales charges are paid by
               investors. Promotional expenses in connection with offers and
               sales of shares are paid by Janus Capital.
 
               Janus Capital also may make payments to selected broker-dealer
               firms or institutions which were instrumental in the acquisition
               of shareholders for the Funds or which performed services with
               respect to shareholder accounts. The minimum aggregate size
               required for eligibility for such payments, and the factors in
               selecting the broker-dealer firms and institutions to which they
               will be made, are determined from time to time by Janus Capital.
 
 26
<PAGE> 
Portfolio transactions and brokerage
 
               Decisions as to the assignment of portfolio business for the
               Funds and negotiation of its commission rates are made by Janus
               Capital, whose policy is to obtain the "best execution" (prompt
               and reliable execution at the most favorable security price) of
               all portfolio transactions.
 
               In selecting brokers and dealers and in negotiating commissions,
               Janus Capital considers a number of factors, including but not
               limited to: Janus Capital's knowledge of currently available
               negotiated commission rates or prices of securities currently
               available and other current transaction costs; the nature of the
               security being traded; the size and type of the transaction; the
               nature and character of the markets for the security to be
               purchased or sold; the desired timing of the trade; the activity
               existing and expected in the market for the particular security;
               confidentiality; the quality of the execution, clearance and
               settlement services; financial stability of the broker or dealer;
               the existence of actual or apparent operational problems of any
               broker or dealer; and research products or services provided. In
               recognition of the value of the foregoing factors, Janus Capital
               may place portfolio transactions with a broker or dealer with
               whom it has negotiated a commission that is in excess of the
               commission another broker or dealer would have charged for
               effecting that transaction if Janus Capital determines in good
               faith that such amount of commission was reasonable in relation
               to the value of the brokerage and research provided by such
               broker or dealer viewed in terms of either that particular
               transaction or of the overall responsibilities of Janus Capital.
               These research and other services may include, but are not
               limited to, general economic and security market reviews,
               industry and company reviews, evaluations of securities,
               recommendations as to the purchase and sale of securities and
               access to third party publications, computer and electronic
               equipment and software. Research received from brokers or dealers
               is supplemental to Janus Capital's own research efforts.
 
               For the fiscal year ended October 31, 1998, the Funds paid no
               brokerage commissions to brokers and dealers in transactions
 
                                                                              27
<PAGE> 
 
               identified for execution primarily on the basis of research and
               other services provided to the Funds.
 
               For the fiscal years ended October 31, 1998, October 31, 1997 and
               October 31, 1996, the total brokerage commissions paid by the
               Funds are summarized below:
 
   
<TABLE>
<CAPTION>
                       Fund Name                            1998       1997        1996
- ----------------------------------------------------------------------------------------
<S>                                                         <C>       <C>         <C>
Janus Money Market Fund                                     $0          $0        $4,851
Janus Government Money Market Fund                          $0          $0          $0
Janus Tax-Exempt Money Market Fund                          $0          $0          $0
</TABLE>
    
 
               The Funds generally buy and sell securities in principal
               transactions, in which no commissions are paid. However, the
               Funds may engage an agent and pay commissions for such
               transactions if Janus Capital believes that the net result of the
               transaction to the respective Fund will be no less favorable than
               that of contemporaneously available principal transactions.
 
               Janus Capital may use research products and services in servicing
               other accounts in addition to the Funds. If Janus Capital
               determines that any research product or service has a mixed use,
               such that it also serves functions that do not assist in the
               investment decision-making process, Janus Capital may allocate
               the costs of such service or product accordingly. Only that
               portion of the product or service that Janus Capital determines
               will assist it in the investment decision-making process may be
               paid for in brokerage commission dollars. Such allocation may
               create a conflict of interest for Janus Capital.
 
               Janus Capital may consider sales of Shares by a broker-dealer or
               the recommendation of a broker-dealer to its customers that they
               purchase Shares as a factor in the selection of broker-dealers to
               execute Fund portfolio transactions. Janus Capital may also
               consider payments made by brokers effecting transactions for a
               Fund (i) to the Fund or (ii) to other persons on behalf of the
               Fund for services provided to the Fund for which it would be
               obligated to pay. In placing portfolio business with such broker-
               dealers, Janus Capital will seek the best execution of each
               transaction.
 
 28
<PAGE> 
 
               When the Funds purchase or sell a security in the over-the-
               counter market, the transaction takes place directly with a
               principal market-maker, without the use of a broker, except in
               those circumstances where in the opinion of Janus Capital better
               prices and executions will be achieved through the use of a
               broker.
 
               As of October 31, 1998, certain Funds owned securities of their
               regular broker-dealers (or parents), as shown below:
 
   
<TABLE>
<CAPTION>
                                       Name of                  Value of
        Fund Name                   Broker-Dealer           Securities Owned
- ----------------------------------------------------------------------------
<S>                         <C>                             <C>
Janus Money Market Fund     Banker's Trust Securities
                             Corp.                            $262,495,236
                            Merrill Lynch, Pierce,
                            Fenner & Smith, Inc.              $139,999,803
                            Lehman Brothers, Inc.             $300,000,000
                            Goldman Sachs Group L.P.          $300,000,000
                            Deutsche Morgan Grenfell, Inc.    $150,000,000
                            Bear Stearns Co., Inc.            $ 99,015,375
                            ABN AMRO Securities, Inc.         $586,000,000
                            BT Alex Brown, Inc.               $ 50,000,000
                            Salomon Smith Barney, Inc.        $675,000,000
                            HSBC America, Inc.                $ 73,435,489
                            CIT Group, Inc.                   $149,881,540
                            Barclay Capital, Inc.             $250,000,000
Janus Government Money
  Market Fund               ABN AMRO Securities, Inc.         $ 93,200,000
                            CS First Boston, Inc.             $250,000,000
                            JP Morgan Securities, Inc.        $ 25,100,000
                            Salomon Smith Barney, Inc.        $125,000,000
</TABLE>
    
 
                                                                              29
<PAGE> 
Trustees and officers
 
               The following are the names of the Trustees and officers of the
               Trust, together with a brief description of their principal
               occupations during the last five years.
 
Thomas H. Bailey, Age 61 - Trustee, Chairman and President*#
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Trustee, Chairman and President of Janus Aspen Series. Chairman,
               Chief Executive Officer, Director and President of Janus Capital.
               Director of Janus Distributors, Inc.
 
James P. Craig, III, Age 42 - Trustee*#
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Trustee and Executive Vice President of Janus Aspen Series. Chief
               Investment Officer, Vice Chairman and Director of Janus Capital.
               Executive Vice President and Portfolio Manager of Janus Fund.
               Executive Vice President and Co-Manager of Janus Venture Fund.
 
Gary O. Loo, Age 58 - Trustee#
102 N. Cascade Avenue, Suite 500
Colorado Springs, CO 80903
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. President and Director of High
               Valley Group, Inc., Colorado Springs, CO (investments).
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
#Member of the Trust's Executive Committee.
 
 30
<PAGE> 
 
Dennis B. Mullen, Age 55 - Trustee
7500 E. McCormick Parkway, #24
Scottsdale, AZ 85258
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Private Investor. Formerly (1997-
               1998), Chief Financial Officer-Boston Market Concepts, Boston
               Chicken, Inc., Golden, CO (restaurant chain); (1993-1997),
               President and Chief Executive Officer of BC Northwest, L.P., a
               franchise of Boston Chicken, Inc., Bellevue, WA (restaurant
               chain).
 
James T. Rothe, Age 55 - Trustee
102 South Tejon Street, Suite 1100
Colorado Springs, CO 80903
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Professor of Business, University
               of Colorado, Colorado Springs, CO. Principal, Phillips-Smith
               Retail Group, Colorado Springs, CO (a venture capital firm).
               Formerly (1986-1994), Dean of the College of Business, University
               of Colorado, Colorado Springs, CO.
 
William D. Stewart, Age 54 - Trustee#
5330 Sterling Drive
Boulder, CO 80302
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. President of HPS Division of MKS
               Instruments, Boulder, CO (manufacturer of vacuum fittings and
               valves).
 
Martin H. Waldinger, Age 60 - Trustee
4940 Sandshore Court
San Diego, CA 92130
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Private Consultant. Formerly (1993
               - 1996), Director of Run Technologies, Inc., a software
               development firm, San Carlos, CA.
 
- --------------------------------------------------------------------------------
#Member of the Trust's Executive Committee.
 
                                                                              31
<PAGE> 
 
Sharon S. Pichler, Age 49 - Executive Vice President*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
   
               Executive Vice President of Janus Money Market Fund, Janus
               Government Money Market Fund and Janus Tax-Exempt Money Market
               Fund. Portfolio Manager of Janus Money Market Fund and Janus
               Tax-Exempt Money Market Fund. Formerly, Portfolio Manager of
               Janus Government Money Market Fund (February 1995-February 1999).
               Vice President of Janus Capital. Formerly, Assistant Vice
               President and Portfolio Manager at USAA Investment Management Co.
               (1990-1994).
    
 
Thomas A. Early, Age 44 - Vice President and General Counsel*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Vice President and General Counsel of Janus Aspen Series. Vice
               President, General Counsel and Secretary of Janus Capital. Vice
               President and General Counsel of Janus Service Corporation, Janus
               Distributors, Inc. and Janus Capital International, Ltd. Director
               of Janus World Funds Plc. Formerly (1997-1998), Executive Vice
               President and General Counsel of Prudential Investments Fund
               Management LLC, Newark, NJ. Formerly (1994-1997), Vice President
               and General Counsel of Prudential Retirement Services, Newark,
               NJ. Formerly (1988-1994), Associate General Counsel and Chief
               Financial Services Counsel, Frank Russell Company, Tacoma, WA.
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
 
 32
<PAGE> 
 
Steven R. Goodbarn, Age 41  - Vice President and Chief Financial Officer*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Vice President and Chief Financial Officer of Janus Aspen Series.
               Vice President of Finance, Treasurer and Chief Financial Officer
               of Janus Capital, Janus Service Corporation and Janus
               Distributors, Inc. Director of Janus Service Corporation, Janus
               Distributors, Inc. and Janus World Funds Plc. Director, Treasurer
               and Vice President of Finance of Janus Capital International Ltd.
               Formerly (May 1992-January 1996), Treasurer of Janus Investment
               Fund and Janus Aspen Series.
 
Kelley Abbott Howes, Age 33 - Assistant Vice President and Secretary*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Assistant Vice President and Secretary of Janus Aspen Series.
               Director and President of Janus Distributors, Inc. Assistant Vice
               President and Associate Counsel of Janus Capital. Formerly (1990
               - 1994), with The Boston Company Advisors, Inc., Boston, MA
               (mutual fund administration services).
 
Glenn P. O'Flaherty, Age 40 - Treasurer and Chief Accounting Officer*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Treasurer and Chief Accounting Officer of Janus Aspen Series.
               Vice President of Janus Capital. Formerly, (1991-1997) Director
               of Fund Accounting, Janus Capital.
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
 
                                                                              33
<PAGE> 
 
               The Trustees are responsible for major decisions relating to each
               Fund's objective, policies and techniques. The Trustees also
               supervise the operation of the Funds by their officers and review
               the investment decisions of the officers although they do not
               actively participate on a regular basis in making such decisions.
 
               The Trust's Executive Committee shall have and may exercise all
               the powers and authority of the Trustees except for matters
               requiring action by all Trustees pursuant to the Trust's Bylaws
               or Declaration of Trust, Massachusetts Law or the 1940 Act.
 
               The Money Market Funds Committee, consisting of Messrs. Loo,
               Mullen and Rothe, monitors the compliance with policies and
               procedures adopted particularly for money market funds.
 
               The following table shows the aggregate compensation earned by
               and paid to each Trustee by the Funds described in this SAI and
               all funds advised and sponsored by Janus Capital (collectively,
               the "Janus Funds") for the periods indicated. None of the
               Trustees receives any pension or retirement benefits from the
               Funds or the Janus Funds.
 
   
<TABLE>
<CAPTION>
                                              Aggregate Compensation      Total Compensation
                                                from the Funds for     from the Janus Funds for
                                                fiscal year ended        calendar year ended
          Name of Person, Position               October 31, 1998        December 31, 1998**
- ------------------------------------------------------------------------------------------------
<S>                                           <C>                     <C>
Thomas H. Bailey, Chairman and Trustee*                 $0                        $0
James P. Craig, Trustee*                                $0                        $0
William D. Stewart, Trustee                          $ 5,754                   $82,000
Gary O. Loo, Trustee                                 $13,896                   $74,000
Dennis B. Mullen, Trustee                            $12,531                   $82,000
Martin H. Waldinger, Trustee                         $ 5,517                   $74,000
James T. Rothe, Trustee                              $11,913                   $82,000
</TABLE>
    
 
 *An interested person of the Funds and of Janus Capital. Compensated by Janus
  Capital and not the Funds.
**As of December 31, 1998, Janus Funds consisted of two registered investment
  companies comprised of a total of 32 funds.
 
 34
<PAGE> 
Purchase of shares
 
   
               Shares are sold at the net asset value per share as determined at
               the close of the regular trading session of the New York Stock
               Exchange (the "NYSE" or the "Exchange") next occurring after a
               purchase order is received and accepted by a Fund (except net
               asset value is normally determined at 5:00 p.m. (New York time)
               for Janus Government Money Market Fund). A Fund's net asset value
               is calculated each day that both the NYSE and the Federal Reserve
               Banks are open ("bank business day"). As stated in the
               Prospectus, the Funds each seek to maintain a stable net asset
               value per share of $1.00. The Shareholder's Guide Section of the
               Prospectus contains detailed information about the purchase of
               Shares.
    
 
REINVESTMENT OF DIVIDENDS AND DISTRIBUTIONS
 
               If investors do not elect in writing or by phone to receive their
               dividends and distributions via wire transfer, all income
               dividends and capital gains distributions, if any, on Shares are
               reinvested automatically in additional Shares of that Fund at the
               NAV determined on the payment date. Any such election (which may
               be made on the Application or by phone) will apply to dividends
               and distributions the record dates of which fall on or after the
               date that a Fund receives such notice. Changes to distribution
               options must be received at least three days prior to the record
               date to be effective for such date. Investors receiving
               distributions and dividends via wire transfer may elect in
               writing or by phone to change back to automatic reinvestment at
               any time.
 
                                                                              35
<PAGE> 
Redemption of shares
 
               Procedures for redemption of Shares are set forth in the
               Shareholder's Guide section of the Prospectus. Shares normally
               will be redeemed for cash (via wire), although each Fund retains
               the right to redeem Shares in kind under unusual circumstances,
               in order to protect the interests of remaining shareholders, by
               delivery of securities selected from its assets at its
               discretion. However, the Funds are governed by Rule 18f-1 under
               the 1940 Act, which requires each Fund to redeem Shares solely in
               cash up to the lesser of $250,000 or 1% of the net asset value of
               that Fund during any 90-day period for any one shareholder.
               Should redemptions by any shareholder exceed such limitation,
               their Fund will have the option of redeeming the excess in cash
               or in kind. If Shares are redeemed in kind, the redeeming
               shareholder might incur brokerage costs in converting the assets
               to cash. The method of valuing securities used to make
               redemptions in kind will be the same as the method of valuing
               portfolio securities described under "Determination of Net Asset
               Value" and such valuation will be made as of the same time the
               redemption price is determined.
 
               The right to require the Funds to redeem Shares may be suspended,
               or the date of payment may be postponed, whenever (1) trading on
               the NYSE is restricted, as determined by the SEC, or the NYSE is
               closed except for holidays and weekends, (2) the SEC permits such
               suspension and so orders, or (3) an emergency exists as
               determined by the SEC so that disposal of securities or
               determination of NAV is not reasonably practicable.
 
 36
<PAGE> 
Tax-deferred accounts
 
               The Funds offer tax-deferred retirement plans for rollover
               accounts in excess of $250,000. The Individual Retirement Account
               may be used by individuals who meet the above requirement.
 
               Contributions under Traditional and Roth IRAs, SEPs, Defined
               Contribution Plans and Section 403(b)(7) Plans are subject to
               specific contribution limitations. Generally, such contributions
               may be invested at the direction of the participant. The
               investment is then held by Investors Fiduciary Trust Company as
               custodian.
 
               Distributions from tax-deferred accounts may be subject to
               ordinary income tax and may be subject to an additional 10% tax
               if withdrawn prior to age 59 1/2 or used for a nonqualifying
               purpose. Additionally, shareholders generally must start
               withdrawing retirement plan assets no later than April 1 of the
               year after they reach age 70 1/2. Several exceptions to these
               general rules may apply and several methods exist to determine
               the amount and timing of the minimum annual distribution (if
               any). Shareholders should consult with their tax adviser or legal
               counsel prior to receiving any distribution from any tax-deferred
               account, in order to determine the income tax impact of any such
               distribution.
 
               To receive additional information about IRAs along with the
               necessary materials to establish an account, please call the
               Funds at 1-800-525-3713 or write the Funds at P.O. Box 173375,
               Denver, CO 80217-3375. No contribution to any IRA can be made
               until the appropriate forms to establish any such plan have been
               completed.
 
                                                                              37
<PAGE> 
Shareholder accounts
 
               Detailed information about the general procedures for shareholder
               accounts is set forth in the Prospectus. Applications to open
               accounts may be obtained by calling the Funds at 1-800-29JANUS or
               writing to the Funds at 100 Fillmore Street, Denver, Colorado
               80206-4928, Attention: Institutional Services.
 
Dividends and tax status
 
   
               Dividends representing substantially all of the net investment
               income and any net realized gains on sales of securities are
               declared daily, Saturdays, Sundays and holidays included, and
               distributed on the last business day of each month. If a month
               begins on a Saturday, Sunday or holiday, dividends for those days
               are declared at the end of the preceding month and distributed on
               the first business day of the month. A shareholder may receive
               dividends via wire transfer or may choose to have dividends
               automatically reinvested in a Fund's Shares. As described in the
               Prospectus, Shares purchased by wire on a bank business day will
               receive that day's dividend if the purchase is effected at or
               prior to 3:00 p.m. (New York time) for Janus Money Market Fund,
               5:00 p.m. for Janus Government Money Market Fund and 12:00 p.m.
               for Janus Tax-Exempt Money Market Fund. Otherwise, such Shares
               will begin to accrue dividends on the first bank business day
               following receipt of the order. Requests for redemption of Shares
               will be redeemed at the next determined net asset value.
               Redemption requests made by wire that are received prior to 3:00
               p.m. (New York time) for Janus Money Market Fund, 5:00 p.m. for
               Janus Government Money Market Fund and 12:00 p.m. for Janus
               Tax-Exempt Money Market Fund on a bank business day will result
               in Shares being redeemed that day. Proceeds of such a redemption
               will normally be sent to the predesignated bank account on that
               day, but that day's dividend will not be received. Closing times
               for purchase and redemption of Shares may be changed for days in
               which the bond market or the NYSE close early.
    
 
 38
<PAGE> 
 
               Distributions for all of the Funds (except Janus Tax-Exempt Money
               Market Fund) are taxable income and are subject to federal income
               tax (except for shareholders exempt from income tax), whether
               such distributions are received via wire transfer or are
               reinvested in additional Shares. Full information regarding the
               tax status of income dividends and any capital gains
               distributions will be mailed to shareholders for tax purposes on
               or before January 31st of each year. As described in detail in
               the Prospectus, Janus Tax-Exempt Money Market Fund anticipates
               that substantially all income dividends it pays will be exempt
               from federal income tax, although dividends attributable to
               interest on taxable investments, together with distributions from
               any net realized short- or long-term capital gains, are taxable.
 
               The Funds intend to qualify as regulated investment companies by
               satisfying certain requirements prescribed by Subchapter M of the
               Code. Accordingly, a Fund will invest no more than 25% of its
               total assets in a single issuer (other than U.S. government
               securities).
 
               Some money market securities employ a trust or other similar
               structure to modify the maturity, price characteristics, or
               quality of financial assets. For example, put features can be
               used to modify the maturity of a security, or interest rate
               adjustment features can be used to enhance price stability. If
               the structure does not perform as intended, adverse tax or
               investment consequences may result. Neither the Internal Revenue
               Service nor any other regulatory authority has ruled definitively
               on certain legal issues presented by structured securities.
               Future tax or other regulatory determinations could adversely
               affect the value, liquidity, or tax treatment of the income
               received from these securities or the nature and timing of
               distributions made by a Fund.
 
                                                                              39
<PAGE> 
Principal shareholders
 
   
               As of January 20, 1999, the officers and Trustees as a group
               owned less than 1% of the outstanding Shares.
    
 
   
               As of January 20, 1999, the following shareholders owned more
               than 5% of the Shares of Janus Money Market Fund:
    
   
<TABLE>
<CAPTION>
                                                                               Percentage
           Shareholders                        Address                         Ownership
- -----------------------------------------------------------------------------------------
<S>                                 <C>
Wells Fargo Institutional Trust     45 Fremont Street                           10.49%
  Co.                               San Francisco, CA 94105-2204
Capital Network Services            One Bush Street, 11th Floor                  5.08%
                                    San Francisco, CA 94104-4425
Comerica Bank                       411 West Lafayette                          20.67%
                                    Mail Code 3455
                                    Detroit, MI 48226-3155                                               
</TABLE>
    
 
   
               As of January 20, 1999, the following shareholders owned more
               than 5% of the Shares of Janus Government Money Market Fund:
    
   
<TABLE>
<CAPTION>
                                                                               Percentage
           Shareholders                        Address                         Ownership
- -----------------------------------------------------------------------------------------
<S>                                 <C>
Janus Twenty Fund                   100 Fillmore Street                         61.13%
                                    Denver, CO 80206-4928
Janus Worldwide Fund                100 Fillmore Street                         23.32%
                                    Denver, CO 80206-4928 
</TABLE>
    
 
   
               As of January 20, 1999, the following shareholder owned more than
               5% of the Shares of Janus Tax-Exempt Money Market Fund:
    
   
<TABLE>
<CAPTION>
                                                                               Percentage
           Shareholder                         Address                         Ownership
- -----------------------------------------------------------------------------------------
<S>                                 <C>
Janus Capital Corporation           100 Fillmore Street                         64.67%
                                    Denver, CO 80206-4928 
</TABLE>
    
 
 40
<PAGE> 
Miscellaneous information
 
               Each Fund is a series of the Trust, a Massachusetts Business
               Trust that was created on February 11, 1986. The Trust is an
               open-end management investment company registered under the 1940
               Act. As of the date of this SAI, the Trust offers 21 separate
               series, three of which currently offer three classes of Shares.
 
               Janus Capital reserves the right to the name "Janus." In the
               event that Janus Capital does not continue to provide investment
               advice to the Funds, the Funds must cease to use the name "Janus"
               as soon as reasonably practicable.
 
               Under Massachusetts law, shareholders of the Funds could, under
               certain circumstances, be held liable for the obligations of
               their Fund. However, the Agreement and Declaration of Trust (the
               "Declaration of Trust") disclaims shareholder liability for acts
               or obligations of the Funds and requires that notice of this
               disclaimer be given in each agreement, obligation or instrument
               entered into or executed by the Funds or the Trustees. The
               Declaration of Trust also provides for indemnification from the
               assets of the Funds for all losses and expenses of any Fund
               shareholder held liable for the obligations of their Fund. Thus,
               the risk of a shareholder incurring a financial loss on account
               of its liability as a shareholder of one of the Funds is limited
               to circumstances in which their Fund would be unable to meet its
               obligations. The possibility that these circumstances would occur
               is remote. The Trustees intend to conduct the operations of the
               Funds to avoid, to the extent possible, liability of shareholders
               for liabilities of their Fund.
 
SHARES OF THE TRUST
 
               The Trust is authorized to issue an unlimited number of shares of
               beneficial interest with a par value of one cent per share for
               each series of the Trust. Shares of each Fund are fully paid and
               nonassessable when issued. All shares of a Fund participate
               equally in dividends and other distributions by such Fund, and in
               residual assets of that Fund in the event of liquidation. Shares
               of each Fund have no preemptive, conversion or subscription
               rights.
 
                                                                              41
<PAGE> 
 
               The Trust is authorized to issue multiple classes of shares for
               each Fund. Currently, Janus Money Market Fund, Janus Government
               Money Market Fund and Janus Tax-Exempt Money Market Fund each
               offer three classes of shares by separate prospectuses. The
               Shares discussed in this SAI are offered only to individual,
               institutional and corporate clients and foundations and trusts
               meeting certain minimum investment criteria. A second class of
               shares, Service Shares, is offered through banks and other
               financial institutions that meet minimum investment requirements
               in connection with trust accounts, cash management programs and
               similar programs. A third class of shares, Investor Shares, is
               offered to the general public.
 
SHAREHOLDER MEETINGS
 
               The Trust does not intend to hold annual shareholder meetings.
               However, special meetings may be called for a specific Fund or
               for the Trust as a whole for purposes such as electing or
               removing Trustees, terminating or reorganizing the Trust,
               changing fundamental policies, or for any other purpose requiring
               a shareholder vote under the 1940 Act. Separate votes are taken
               by each Fund only if a matter affects or requires the vote of
               only that Fund or that Fund's interest in the matter differs from
               the interest of other portfolios of the Trust. As a shareholder,
               you are entitled to one vote for each share that you own.
 
VOTING RIGHTS
 
               The present Trustees were elected at a meeting of the Trust's
               shareholders held on July 10, 1992, with the exception of Mr.
               Craig and Mr. Rothe who were appointed by the Trustees as of June
               30, 1995 and January 1, 1997, respectively. Under the Declaration
               of Trust, each Trustee will continue in office until the
               termination of the Trust or his earlier death, retirement,
               resignation, bankruptcy, incapacity or removal. Vacancies will be
               filled by a majority of the remaining Trustees, subject to the
               1940 Act. Therefore, no annual or regular meetings of
               shareholders normally will be held, unless otherwise required by
               the Declaration of Trust or the 1940 Act. Subject to the
               foregoing, shareholders have the power to vote to elect or remove
               Trustees,
 
 42
<PAGE> 
 
               to terminate or reorganize their Fund, to amend the Declaration
               of Trust, to bring certain derivative actions and on any other
               matters on which a shareholder vote is required by the 1940 Act,
               the Declaration of Trust, the Trust's Bylaws or the Trustees.
 
               As mentioned above in "Shareholder Meetings," each share of each
               series of the Trust has one vote (and fractional votes for
               fractional shares). Shares of all series of the Trust have
               noncumulative voting rights, which means that the holders of more
               than 50% of the shares of all series of the Trust voting for the
               election of Trustees can elect 100% of the Trustees if they
               choose to do so and, in such event, the holders of the remaining
               shares will not be able to elect any Trustees. Each series or
               class of the Trust will vote separately only with respect to
               those matters that affect only that series or class or if the
               interest of the series or class in the matter differs from the
               interests of other series or classes of the Trust.
 
INDEPENDENT ACCOUNTANTS
 
               PricewaterhouseCoopers LLP, 950 Seventeenth Street, Suite 2500,
               Denver, Colorado 80202, independent accountants for the Funds,
               audit the Funds' annual financial statements and prepare their
               tax returns.
 
REGISTRATION STATEMENT
 
               The Trust has filed with the SEC, Washington, D.C., a
               Registration Statement under the Securities Act of 1933, as
               amended, with respect to the securities to which this SAI
               relates. If further information is desired with respect to the
               Funds or such securities, reference is made to the Registration
               Statement and the exhibits filed as a part thereof.
 
                                                                              43
<PAGE> 
Financial statements
 
   
               The following audited financial statements of the Funds for the
               period ended October 31, 1998 are hereby incorporated into this
               SAI by reference to the Funds' Annual Report dated October 31,
               1998.
    
 
DOCUMENTS INCORPORATED BY REFERENCE TO THE ANNUAL REPORT
 
               Schedules of Investments as of October 31, 1998
 
               Statements of Operations for the period ended October 31, 1998
 
               Statements of Assets and Liabilities as of October 31, 1998
 
               Statements of Changes in Net Assets for the periods ended October
               31, 1998 and 1997
 
               Financial Highlights for each of the periods indicated
 
               Notes to Financial Statements
 
               Report of Independent Accountants
 
               The portions of such Annual Report that are not specifically
               listed above are not incorporated by reference into this SAI and
               are not part of the Registration Statement.
 
 44
<PAGE> 
Appendix A
 
DESCRIPTION OF SECURITIES RATINGS
 
MOODY'S AND STANDARD & POOR'S
 
               MUNICIPAL AND CORPORATE BONDS AND MUNICIPAL LOANS. The two
               highest ratings of Standard & Poor's Ratings Services for
               municipal and corporate bonds are AAA and AA. Bonds rated AAA
               have the highest rating assigned by S&P to a debt obligation.
               Capacity to pay interest and repay principal is extremely strong.
               Bonds rated AA have a very strong capacity to pay interest and
               repay principal and differ from the highest rated issues only in
               a small degree. The AA rating may be modified by the addition of
               a plus (+) or minus (-) sign to show relative standing within
               that rating category.
 
               The two highest ratings of Moody's Investors Service, Inc. for
               municipal and corporate bonds are Aaa and Aa. Bonds rated Aaa are
               judged by Moody's to be of the best quality. Bonds rated Aa are
               judged to be of high quality by all standards. Together with the
               Aaa group, they comprise what are generally known as high-grade
               bonds. Moody's states that Aa bonds are rated lower than the best
               bonds because margins of protection or other elements make
               long-term risks appear somewhat larger than Aaa securities. The
               generic rating Aa may be modified by the addition of the numerals
               1, 2 or 3. The modifier 1 indicates that the security ranks in
               the higher end of the Aa rating category; the modifier 2
               indicates a mid-range ranking; and the modifier 3 indicates that
               the issue ranks in the lower end of such rating category.
 
               SHORT TERM MUNICIPAL LOANS. S&P's highest rating for short-term
               municipal loans is SP-1. S&P states that short-term municipal
               securities bearing the SP-1 designation have a strong capacity to
               pay principal and interest. Those issues rated SP-1 which are
               determined to possess a very strong capacity to pay debt service
               will be given a plus (+) designation. Issues rated SP-2 have
               satisfactory capacity to pay principal and interest with some
               vulnerability to adverse financial and economic changes over the
               term of the notes.
 
               Moody's highest rating for short-term municipal loans is MIG-1/
               VMIG-1. Moody's states that short-term municipal securities rated
               MIG-1/VMIG-1 are of the best quality, enjoying strong protection
 
                                                                              45
<PAGE> 
 
               from established cash flows of funds for their servicing or from
               established and broad-based access to the market for refinancing,
               or both. Loans bearing the MIG-2/VMIG-2 designation are of high
               quality, with margins of protection ample although not so large
               as in the MIG-1/VMIG-1 group.
 
               OTHER SHORT-TERM DEBT SECURITIES. Prime-1 and Prime-2 are the two
               highest ratings assigned by Moody's for other short-term debt
               securities and commercial paper, and A-1 and A-2 are the two
               highest ratings for commercial paper assigned by S&P. Moody's
               uses the numbers 1, 2 and 3 to denote relative strength within
               its highest classification of Prime, while S&P uses the numbers
               1, 2 and 3 to denote relative strength within its highest
               classification of A. Issuers rated Prime-1 by Moody's have a
               superior ability for repayment of senior short-term debt
               obligations and have many of the following characteristics:
               leading market positions in well-established industries, high
               rates of return on funds employed, conservative capitalization
               structure with moderate reliance on debt and ample asset
               protection, broad margins in earnings coverage of fixed financial
               charges and high internal cash generation, and well established
               access to a range of financial markets and assured sources of
               alternate liquidity. Issuers rated Prime-2 by Moody's have a
               strong ability for repayment of senior short-term debt
               obligations and display many of the same characteristics
               displayed by issuers rated Prime-1, but to a lesser degree.
               Issuers rated A-1 by S&P carry a strong degree of safety
               regarding timely repayment. Those issues determined to possess
               extremely strong safety characteristics are denoted with a plus
               (+) designation. Issuers rated A-2 by S&P carry a satisfactory
               degree of safety regarding timely repayment.
 
 46
<PAGE> 
 
FITCH
 
<TABLE>
                <S>                          <C>
                BOND RATING                  EXPLANATION
                ----------------------------------------------------------------
                F-1+........................ Exceptionally strong credit
                                             quality. Issues assigned this
                                             rating are regarded as having the
                                             strongest degree of assurance for
                                             timely payment.
                F-1......................... Very strong credit quality. Issues
                                             assigned this rating reflect an
                                             assurance for timely payment only
                                             slightly less in degree than issues
                                             rated F-1+.
                F-2......................... Good credit quality. Issues
                                             assigned this rating have a
                                             satisfactory degree of assurance
                                             for timely payments, but the margin
                                             of safety is not as great as the F-
                                             1+ and F-1 ratings.
</TABLE>
 
DUFF & PHELPS INC.
 
<TABLE>
                <S>                          <C>
                BOND RATING                  EXPLANATION
                ----------------------------------------------------------------
                Duff 1+..................... Highest certainty of timely
                                             payment. Short-term liquidity,
                                             including internal operating
                                             factors and/or ready access to
                                             alternative sources of funds, is
                                             clearly outstanding, and safety is
                                             just below risk-free U.S. Treasury
                                             short-term obligations.
                Duff 1...................... Very high certainty of timely
                                             payment. Liquidity factors are
                                             excellent and supported by good
                                             fundamental protection factors.
                                             Risk factors are minor.
                Duff 1-..................... High certainty of timely payment.
                                             Liquidity factors are strong and
                                             supported by good fundamental
                                             protection factors. Risk factors
                                             are very small.
                Duff 2...................... Good certainty of timely payment.
                                             Liquidity factors and company
                                             fundamentals are sound. Although
                                             ongoing funding needs may enlarge
                                             total financing requirements,
                                             access to capital markets is good.
                                             Risk factors are small.
</TABLE>
 
                                                                              47
<PAGE> 
 
THOMSON BANKWATCH, INC.
 
<TABLE>
                <S>                          <C>
                BOND RATING                  EXPLANATION
                ----------------------------------------------------------------
                TBW-1....................... The highest category; indicates a
                                             very high degree of likelihood that
                                             principal and interest will be paid
                                             on a timely basis.
                TBW-2....................... The second highest category; while
                                             the degree of safety regarding
                                             timely repayment of principal and
                                             interest is strong, the relative
                                             degree of safety is not as high as
                                             for issues rated TBW-1.
                TBW-3....................... The lowest investment grade
                                             category; indicates that while more
                                             susceptible to adverse developments
                                             (both internal and external) than
                                             obligations with higher ratings,
                                             capacity to service principal and
                                             interest in a timely fashion is
                                             considered adequate.
                TBW-4....................... The lowest rating category; this
                                             rating is regarded as
                                             non-investment grade and therefore
                                             speculative.
</TABLE>
 
IBCA, INC.
 
<TABLE>
                <S>                          <C>
                BOND RATING                  EXPLANATION
                ----------------------------------------------------------------
                A1+......................... Obligations supported by the
                                             highest capacity for timely
                                             repayment. Where issues possess a
                                             particularly strong credit feature,
                                             a rating of A1+ is assigned.
                A2.......................... Obligations supported by a good
                                             capacity for timely repayment.
                A3.......................... Obligations supported by a
                                             satisfactory capacity for timely
                                             repayment.
                B........................... Obligations for which there is an
                                             uncertainty as to the capacity to
                                             ensure timely repayment.
                C........................... Obligations for which there is a
                                             high risk of default or which are
                                             currently in default.
</TABLE>
 
 48
<PAGE> 
Appendix B
 
DESCRIPTION OF MUNICIPAL SECURITIES
 
               MUNICIPAL NOTES generally are used to provide for short-term
               capital needs and usually have maturities of one year or less.
               They include the following:
 
               1. PROJECT NOTES, which carry a U.S. government guarantee, are
               issued by public bodies (called "local issuing agencies") created
               under the laws of a state, territory, or U.S. possession. They
               have maturities that range up to one year from the date of
               issuance. Project Notes are backed by an agreement between the
               local issuing agency and the Federal Department of Housing and
               Urban Development. These Notes provide financing for a wide range
               of financial assistance programs for housing, redevelopment, and
               related needs (such as low-income housing programs and renewal
               programs).
 
               2. TAX ANTICIPATION NOTES ARE issued to finance working capital
               needs of municipalities. Generally, they are issued in
               anticipation of various seasonal tax revenues, such as income,
               sales, use and business taxes, and are payable from these
               specific future taxes.
 
               3. REVENUE ANTICIPATION NOTES are issued in expectation of
               receipt of other types of revenues, such as Federal revenues
               available under the Federal Revenue Sharing Programs.
 
               4. BOND ANTICIPATION NOTES are issued to provide interim
               financing until long-term financing can be arranged. In most
               cases, the long-term bonds then provide the money for the
               repayment of the Notes.
 
               5. CONSTRUCTION LOAN NOTES are sold to provide construction
               financing. After successful completion and acceptance, many
               projects receive permanent financing through the Federal Housing
               Administration under the Federal National Mortgage Association
               ("Fannie Mae") or the Government National Mortgage Association
               ("Ginnie Mae").
 
               6. TAX-EXEMPT COMMERCIAL PAPER is a short-term obligation with a
               stated maturity of 365 days or less. It is issued by agencies of
               state and local governments to finance seasonal working capital
               needs or as short-term financing in anticipation of longer term
               financing.
 
                                                                              49
<PAGE> 
 
               MUNICIPAL BONDS, which meet longer term capital needs and
               generally have maturities of more than one year when issued, have
               three principal classifications:
 
               1. GENERAL OBLIGATION BONDS are issued by such entities as
               states, counties, cities, towns, and regional districts. The
               proceeds of these obligations are used to fund a wide range of
               public projects, including construction or improvement of
               schools, highways and roads, and water and sewer systems. The
               basic security behind General Obligation Bonds is the issuer's
               pledge of its full faith and credit and taxing power for the
               payment of principal and interest. The taxes that can be levied
               for the payment of debt service may be limited or unlimited as to
               the rate or amount of special assessments.
 
               2. REVENUE BONDS in recent years have come to include an
               increasingly wide variety of types of municipal obligations. As
               with other kinds of municipal obligations, the issuers of revenue
               bonds may consist of virtually any form of state or local
               governmental entity, including states, state agencies, cities,
               counties, authorities of various kinds, such as public housing or
               redevelopment authorities, and special districts, such as water,
               sewer or sanitary districts. Generally, revenue bonds are secured
               by the revenues or net revenues derived from a particular
               facility, group of facilities, or, in some cases, the proceeds of
               a special excise or other specific revenue source. Revenue bonds
               are issued to finance a wide variety of capital projects
               including electric, gas, water and sewer systems; highways,
               bridges, and tunnels; port and airport facilities; colleges and
               universities; and hospitals. Many of these bonds provide
               additional security in the form of a debt service reserve fund to
               be used to make principal and interest payments. Various forms of
               credit enhancement, such as a bank letter of credit or municipal
               bond insurance, may also be employed in revenue bond issues.
               Housing authorities have a wide range of security, including
               partially or fully insured mortgages, rent subsidized and/or
               collateralized mortgages, and/or the net revenues from housing or
               other public projects. Some authorities provide further security
               in the form of a state's ability (without
 
 50
<PAGE> 
 
               obligation) to make up deficiencies in the debt service reserve
               fund.
 
               In recent years, revenue bonds have been issued in large volumes
               for projects that are privately owned and operated (see 3 below).
 
               3. PRIVATE ACTIVITY BONDS are considered municipal bonds if the
               interest paid thereon is exempt from Federal income tax and are
               issued by or on behalf of public authorities to raise money to
               finance various privately operated facilities for business and
               manufacturing, housing and health. These bonds are also used to
               finance public facilities such as airports, mass transit systems
               and ports. The payment of the principal and interest on such
               bonds is dependent solely on the ability of the facility's user
               to meet its financial obligations and the pledge, if any, of real
               and personal property as security for such payment.
 
               While, at one time, the pertinent provisions of the Internal
               Revenue Code permitted private activity bonds to bear tax-exempt
               interest in connection with virtually any type of commercial or
               industrial project (subject to various restrictions as to
               authorized costs, size limitations, state per capita volume
               restrictions, and other matters), the types of qualifying
               projects under the Code have become increasingly limited,
               particularly since the enactment of the Tax Reform Act of 1986.
               Under current provisions of the Code, tax-exempt financing
               remains available, under prescribed conditions, for certain
               privately owned and operated rental multi-family housing
               facilities, nonprofit hospital and nursing home projects,
               airports, docks and wharves, mass commuting facilities and solid
               waste disposal projects, among others, and for the refunding
               (that is, the tax-exempt refinancing) of various kinds of other
               private commercial projects originally financed with tax-exempt
               bonds. In future years, the types of projects qualifying under
               the Code for tax-exempt financing are expected to become
               increasingly limited.
 
               Because of terminology formerly used in the Internal Revenue
               Code, virtually any form of private activity bond may still be
               referred to as an "industrial development bond," but more and
 
                                                                              51
<PAGE> 
 
               more frequently revenue bonds have become classified according to
               the particular type of facility being financed, such as hospital
               revenue bonds, nursing home revenue bonds, multi-family housing
               revenue bonds, single family housing revenue bonds, industrial
               development revenue bonds, solid waste resource recovery revenue
               bonds, and so on.
 
               OTHER MUNICIPAL OBLIGATIONS, incurred for a variety of financing
               purposes, include: municipal leases, which may take the form of a
               lease or an installment purchase or conditional sale contract,
               are issued by state and local governments and authorities to
               acquire a wide variety of equipment and facilities such as fire
               and sanitation vehicles, telecommunications equipment and other
               capital assets. Municipal leases frequently have special risks
               not normally associated with general obligation or revenue bonds.
               Leases and installment purchase or conditional sale contracts
               (which normally provide for title to the leased asset to pass
               eventually to the government issuer) have evolved as a means for
               governmental issuers to acquire property and equipment without
               meeting the constitutional and statutory requirements for the
               issuance of debt. The debt-issuance limitations of many state
               constitutions and statutes are deemed to be inapplicable because
               of the inclusion in many leases or contracts of
               "non-appropriation" clauses that provide that the governmental
               issuer has no obligation to make future payments under the lease
               or contract unless money is appropriated for such purpose by the
               appropriate legislative body on a yearly or other periodic basis.
               To reduce this risk, the Fund will only purchase municipal leases
               subject to a non-appropriation clause when the payment of
               principal and accrued interest is backed by an unconditional
               irrevocable letter of credit, or guarantee of a bank or other
               entity that meets the criteria described in the Prospectus.
 
               Tax-exempt bonds are also categorized according to whether the
               interest is or is not includible in the calculation of
               alternative minimum taxes imposed on individuals, according to
               whether the costs of acquiring or carrying the bonds are or are
               not deductible in part by banks and other financial institutions,
               and according to other criteria relevant for Federal income tax
               purposes. Due to the
 
 52
<PAGE> 
 
               increasing complexity of Internal Revenue Code and related
               requirements governing the issuance of tax-exempt bonds, industry
               practice has uniformly required, as a condition to the issuance
               of such bonds, but particularly for revenue bonds, an opinion of
               nationally recognized bond counsel as to the tax-exempt status of
               interest on the bonds.
 
                                                                              53
<PAGE> 
 
[JANUS LOGO]


   
                1-800-29JANUS
    
                P.O. Box 173375
                Denver, Colorado 80217-3375
                janus.com
 
  3174
<PAGE> 
 
                                                    [JANUS LOGO]
 
                    Janus Investment Fund
                    Janus Money Market Fund
                    Janus Government Money Market Fund
                    Janus Tax-Exempt Money Market Fund
                    Service Shares
 
                    100 Fillmore Street
                    Denver, CO 80206-4928
                    (800) 29JANUS
 
                    Statement of Additional Information
 
                    February 17, 1999
 
                    This Statement of Additional Information expands upon and
                    supplements the information contained in the current
                    Prospectus for the Service Shares (the "Shares") of Janus
                    Money Market Fund, Janus Government Money Market Fund and
                    Janus Tax-Exempt Money Market Fund. The Funds are each a
                    separate series of Janus Investment Fund, a Massachusetts
                    business trust.
 
                    This SAI is not a Prospectus and should be read in
                    conjunction with the Prospectus dated February 17, 1999,
                    which is incorporated by reference into this SAI and may
                    be obtained from the Trust at the above phone number or
                    address. This SAI contains additional and more detailed
                    information about the Funds' operations and activities
                    than the Prospectus. The Annual Report, which contains
                    important financial information about the Funds, is
                    incorporated by reference into this SAI and is also
                    available, without charge, at the above phone number or
                    address.
<PAGE> 
 
    [JANUS LOGO]
<PAGE> 
 
                                                            Table of contents
 
<TABLE>
                <S>                                               <C>
                Investment Restrictions and Investment
                Strategies......................................    2
                Performance Data................................   18
                Investment Adviser and Administrator............   22
                Custodian, Transfer Agent and Certain
                Affiliations....................................   27
                Portfolio Transactions and Brokerage............   28
                Trustees and Officers...........................   31
                Purchase of Shares..............................   36
                Redemptions of Shares...........................   36
                Shareholder Accounts............................   38
                Dividends and Tax Status........................   38
                Principal Shareholders..........................   40
                Miscellaneous Information.......................   41
                Financial Statements............................   44
                Appendix A - Description of Securities Ratings..   45
                Appendix B - Description of Municipal
                Securities......................................   49
</TABLE>
 
                                                                               1
<PAGE> 
Investment restrictions and 
           investment strategies
 
INVESTMENT RESTRICTIONS
 
               Each Fund has adopted certain fundamental investment restrictions
               that cannot be changed without shareholder approval. Shareholder
               approval means approval by the lesser of (i) more than 50% of the
               outstanding voting securities of the Trust (or a particular Fund
               or particular class of Shares if a matter affects just that Fund
               or that class of Shares), or (ii) 67% or more of the voting
               securities present at a meeting if the holders of more than 50%
               of the outstanding voting securities of the Trust (or a
               particular Fund or class of Shares) are present or represented by
               proxy.
 
               As used in the restrictions set forth below and as used elsewhere
               in this SAI, the term "U.S. Government Securities" shall have the
               meaning set forth in the 1940 Act. The 1940 Act defines U.S.
               Government Securities as securities issued or guaranteed by the
               United States government, its agencies or instrumentalities. U.S.
               Government Securities may also include repurchase agreements
               collateralized and municipal securities escrowed with or refunded
               with escrowed U.S. government securities.
 
               The Funds have adopted the following fundamental policies:
 
               (1) With respect to 75% of its assets, a Fund may not purchase a
               security other than a U.S. Government Security, if, as a result,
               more than 5% of the Fund's total assets would be invested in the
               securities of a single issuer or the Fund would own more than 10%
               of the outstanding voting securities of any single issuer. (As
               noted in the Prospectus, the Funds are also currently subject to
               the greater diversification standards of Rule 2a-7, which are not
               fundamental.)
 
               (2) A Fund may not purchase securities if 25% or more of the
               value of a Fund's total assets would be invested in the
               securities of issuers conducting their principal business
               activities in the same industry; provided that: (i) there is no
               limit on investments in U.S. Government Securities or in
               obligations of domestic commercial banks (including U.S. branches
               of foreign banks subject to regulations under U.S. laws
               applicable to domestic banks and, to the extent that its parent
               is unconditionally liable
 
 2
<PAGE> 
 
               for the obligation, foreign branches of U.S. banks); (ii) this
               limitation shall not apply to a Fund's investments in municipal
               securities; (iii) there is no limit on investments in issuers
               domiciled in a single country; (iv) financial service companies
               are classified according to the end users of their services (for
               example, automobile finance, bank finance and diversified finance
               are each considered to be a separate industry); and (v) utility
               companies are classified according to their services (for
               example, gas, gas transmission, electric, and telephone are each
               considered to be a separate industry).
 
               (3) A Fund may not act as an underwriter of securities issued by
               others, except to the extent that a Fund may be deemed an
               underwriter in connection with the disposition of portfolio
               securities of such Fund.
 
               (4) A Fund may not lend any security or make any other loan if,
               as a result, more than 25% of a Fund's total assets would be lent
               to other parties (but this limitation does not apply to purchases
               of commercial paper, debt securities or repurchase agreements).
 
               (5) A Fund may not purchase or sell real estate or any interest
               therein, except that the Fund may invest in debt obligations
               secured by real estate or interests therein or securities issued
               by companies that invest in real estate or interests therein.
 
               (6) A Fund may borrow money for temporary or emergency purposes
               (not for leveraging) in an amount not exceeding 25% of the value
               of its total assets (including the amount borrowed) less
               liabilities (other than borrowings). If borrowings exceed 25% of
               the value of a Fund's total assets by reason of a decline in net
               assets, the Fund will reduce its borrowings within three business
               days to the extent necessary to comply with the 25% limitation.
               Reverse repurchase agreements or the segregation of assets in
               connection with such agreements shall not be considered borrowing
               for the purposes of this limit.
 
               (7) Each Fund may, notwithstanding any other investment policy or
               restriction (whether or not fundamental), invest all of its
               assets
 
                                                                               3
<PAGE> 
 
               in the securities of a single open-end management investment
               company with substantially the same fundamental investment
               objectives, policies and restrictions as that Fund.
 
               Investment restriction (1) is intended to reflect the
               requirements under Section 5(b)(1) of the 1940 Act for a
               diversified fund. Rule 2a-7 provides that money market funds that
               comply with the diversification limits of Rule 2a-7 are deemed to
               comply with the diversification limits of Section 5(b)(1). Thus,
               the Funds interpret restriction (1) in accordance with Rule 2a-7.
               Accordingly, if securities are subject to a guarantee provided by
               a non-controlled person, the Rule 2a-7 diversification tests
               apply to the guarantor, and the diversification test in
               restriction (1) does not apply to the issuer.
 
               Each Fund has adopted the following nonfundamental investment
               restrictions that may be changed by the Trustees without
               shareholder approval:
 
               (1) A Fund may not invest in securities or enter into repurchase
               agreements with respect to any securities if, as a result, more
               than 10% of the Fund's net assets would be invested in repurchase
               agreements not entitling the holder to payment of principal
               within seven days and in other securities that are not readily
               marketable ("illiquid investments"). The Trustees, or the Fund's
               investment adviser acting pursuant to authority delegated by the
               Trustees, may determine that a readily available market exists
               for certain securities such as securities eligible for resale
               pursuant to Rule 144A under the Securities Act of 1933, or any
               successor to such rule, Section 4(2) commercial paper and
               municipal lease obligations. Accordingly, such securities may not
               be subject to the foregoing limitation.
 
               (2) A Fund may not purchase securities on margin, or make short
               sales of securities, except for short sales against the box and
               the use of short-term credit necessary for the clearance of
               purchases and sales of portfolio securities.
 
 4
<PAGE> 
 
               (3) A Fund may not pledge, mortgage, hypothecate or encumber any
               of its assets except to secure permitted borrowings or in
               connection with permitted short sales.
 
               (4) A Fund may not invest in companies for the purpose of
               exercising control of management.
 
               Under the terms of an exemptive order received from the
               Securities and Exchange Commission ("SEC"), each of the Funds may
               borrow money from or lend money to other funds that permit such
               transactions and for which Janus Capital serves as investment
               adviser. All such borrowing and lending will be subject to the
               above limits. A Fund will borrow money through the program only
               when the costs are equal to or lower than the cost of bank loans.
               Interfund loans and borrowings normally extend overnight, but can
               have a maximum duration of seven days. A Fund will lend through
               the program only when the returns are higher than those available
               from other short-term instruments (such as repurchase
               agreements). A Fund may have to borrow from a bank at a higher
               interest rate if an interfund loan is called or not renewed. Any
               delay in repayment to a lending Fund could result in a lost
               investment opportunity or additional borrowing costs.
 
               For the purposes of the Funds' policies on investing in
               particular industries, the Funds will rely primarily on industry
               or industry group classifications published by Bloomberg L.P. To
               the extent that Bloomberg L.P. industry classifications are so
               broad that the primary economic characteristics in a single
               industry are materially different, the Funds may further classify
               issuers in accordance with industry classifications as published
               by the SEC.
 
                                                                               5
<PAGE> 
 
INVESTMENT STRATEGIES
 
               Each of the Funds may invest only in "eligible securities" as
               defined in Rule 2a-7 adopted under the 1940 Act. Generally, an
               eligible security is a security that (i) is denominated in U.S.
               dollars and has a remaining maturity of 397 days or less (as
               calculated pursuant to Rule 2a-7); (ii) is rated, or is issued by
               an issuer with short-term debt outstanding that is rated, in one
               of the two highest rating categories by any two nationally
               recognized statistical rating organizations ("NRSROs") or, if
               only one NRSRO has issued a rating, by that NRSRO (the "Requisite
               NRSROs") or is unrated and of comparable quality to a rated
               security, as determined by Janus Capital; and (iii) has been
               determined by Janus Capital to present minimal credit risks
               pursuant to procedures approved by the Trustees. In addition, the
               Funds will maintain a dollar-weighted average portfolio maturity
               of 90 days or less. A description of the ratings of some NRSROs
               appears in Appendix A.
 
               Under Rule 2a-7, a Fund may not invest more than five percent of
               its total assets in the securities of any one issuer other than
               U.S. Government Securities, provided that in certain cases a Fund
               may invest more than 5% of its assets in a single issuer for a
               period of up to three business days. Investment in demand
               features, guarantees and other types of instruments or features
               are subject to the diversification limits under Rule 2a-7.
 
               Pursuant to Rule 2a-7, each Fund (except Janus Tax-Exempt Money
               Market Fund) will invest at least 95% of its total assets in
               "first-tier" securities. First-tier securities are eligible
               securities that are rated, or are issued by an issuer with
               short-term debt outstanding that is rated, in the highest rating
               category by the Requisite NRSROs or are unrated and of comparable
               quality to a rated security. In addition, a Fund may invest in
               "second-tier" securities which are eligible securities that are
               not first-tier securities. However, a Fund (except for Janus
               Tax-Exempt Money Market Fund, in certain cases) may not invest in
               a second-tier security if immediately after the acquisition
               thereof the Fund would have invested more than (i) the greater of
               one percent of its total assets or one million dollars in
               second-tier securities issued by that issuer, or (ii) five
               percent of its total assets in second-tier securities.
 
 6
<PAGE> 
 
               The following discussion of types of securities in which the
               Funds may invest supplements and should be read in conjunction
               with the Prospectus.
 
Participation Interests
 
               Each Fund may purchase participation interests in loans or
               securities in which the Funds may invest directly. Participation
               interests are generally sponsored or issued by banks or other
               financial institutions. A participation interest gives a Fund an
               undivided interest in the underlying loans or securities in the
               proportion that the Fund's interest bears to the total principal
               amount of the underlying loans or securities. Participation
               interests, which may have fixed, floating or variable rates, may
               carry a demand feature backed by a letter of credit or guarantee
               of a bank or institution permitting the holder to tender them
               back to the bank or other institution. For certain participation
               interests, a Fund will have the right to demand payment, on not
               more than seven days' notice, for all or a part of the Fund's
               participation interest. The Funds intend to exercise any demand
               rights they may have upon default under the terms of the loan or
               security, to provide liquidity or to maintain or improve the
               quality of the Funds' investment portfolio. A Fund will only
               purchase participation interests that Janus Capital determines
               present minimal credit risks.
 
Variable and Floating Rate Notes
 
               Janus Money Market Fund also may purchase variable and floating
               rate demand notes of corporations and other entities, which are
               unsecured obligations redeemable upon not more than 30 days'
               notice. These obligations include master demand notes that permit
               investment of fluctuating amounts at varying rates of interest
               pursuant to direct arrangements with the issuer of the
               instrument. The issuer of these obligations often has the right,
               after a given period, to prepay the outstanding principal amount
               of the obligations upon a specified number of days' notice. These
               obligations generally are not traded, nor generally is there an
               established secondary market for these obligations. To the extent
               a
 
                                                                               7
<PAGE> 
 
               demand note does not have a seven day or shorter demand feature
               and there is no readily available market for the obligation, it
               is treated as an illiquid investment.
 
               Securities with ultimate maturities of greater than 397 days may
               be purchased only pursuant to Rule 2a-7. Under that Rule, only
               those long-term instruments that have demand features which
               comply with certain requirements and certain variable rate U.S.
               Government Securities may be purchased. The rate of interest on
               securities purchased by a Fund may be tied to short-term Treasury
               or other government securities or indices on securities that are
               permissible investments of the Funds, as well as other money
               market rates of interest. The Funds will not purchase securities
               whose values are tied to interest rates or indices that are not
               appropriate for the duration and volatility standards of a money
               market fund.
 
Mortgage- and Asset-Backed Securities
 
               The Funds may invest in mortgage-backed securities, which
               represent an interest in a pool of mortgages made by lenders such
               as commercial banks, savings and loan institutions, mortgage
               bankers, mortgage brokers and savings banks. Mortgage-backed
               securities may be issued by governmental or government-related
               entities or by non-governmental entities such as banks, savings
               and loan institutions, private mortgage insurance companies,
               mortgage bankers and other secondary market issuers.
 
               Interests in pools of mortgage-backed securities differ from
               other forms of debt securities which normally provide for
               periodic payment of interest in fixed amounts with principal
               payments at maturity or specified call dates. In contrast,
               mortgage-backed securities provide periodic payments which
               consist of interest and, in most cases, principal. In effect,
               these payments are a "pass-through" of the periodic payments and
               optional prepayments made by the individual borrowers on their
               mortgage loans, net of any fees paid to the issuer or guarantor
               of such securities. Additional payments to holders of
               mortgage-backed securities are caused by prepayments resulting
               from the sale of the underlying
 
 8
<PAGE> 
 
               residential property, refinancing or foreclosure, net of fees or
               costs which may be incurred.
 
               As prepayment rates of individual pools of mortgage loans vary
               widely, it is not possible to predict accurately the average life
               of a particular security. Although mortgage-backed securities are
               issued with stated maturities of up to forty years, unscheduled
               or early payments of principal and interest on the underlying
               mortgages may shorten considerably the effective maturities.
               Mortgage-backed securities may have varying assumptions for
               average life. The volume of prepayments of principal on a pool of
               mortgages underlying a particular security will influence the
               yield of that security, and the principal returned to a Fund may
               be reinvested in instruments whose yield may be higher or lower
               than that which might have been obtained had the prepayments not
               occurred. When interest rates are declining, prepayments usually
               increase, with the result that reinvestment of principal
               prepayments will be at a lower rate than the rate applicable to
               the original mortgage-backed security.
 
               The Funds may invest in mortgage-backed securities that are
               issued by agencies or instrumentalities of the U.S. government.
               The Government National Mortgage Association ("GNMA") is the
               principal federal government guarantor of mortgage-backed
               securities. GNMA is a wholly-owned U.S. government corporation
               within the Department of Housing and Urban Development. GNMA
               Certificates are debt securities which represent an interest in
               one mortgage or a pool of mortgages which are insured by the
               Federal Housing Administration or the Farmers Home Administration
               or are guaranteed by the Veterans Administration. The Funds may
               also invest in pools of conventional mortgages which are issued
               or guaranteed by agencies of the U.S. government. GNMA
               pass-through securities are considered to be riskless with
               respect to default in that (i) the underlying mortgage loan
               portfolio is comprised entirely of government-backed loans and
               (ii) the timely payment of both principal and interest on the
               securities is guaranteed by the full faith and credit of the U.S.
               government, regardless of whether or not payments have been
 
                                                                               9
<PAGE> 
 
               made on the underlying mortgages. GNMA pass-through securities
               are, however, subject to the same market risk as comparable debt
               securities. Therefore, the market value of a Fund's GNMA
               securities can be expected to fluctuate in response to changes in
               prevailing interest rate levels.
 
               Residential mortgage loans are pooled also by the Federal Home
               Loan Mortgage Corporation ("FHLMC"). FHLMC is a privately
               managed, publicly chartered agency created by Congress in 1970
               for the purpose of increasing the availability of mortgage credit
               for residential housing. FHLMC issues participation certificates
               ("PCs") which represent interests in mortgages from FHLMC's
               national portfolio. The mortgage loans in FHLMC's portfolio are
               not U.S. government backed; rather, the loans are either
               uninsured with loan-to-value ratios of 80% or less, or privately
               insured if the loan-to-value ratio exceeds 80%. FHLMC guarantees
               the timely payment of interest and ultimate collection of
               principal on FHLMC PCs; the U.S. government does not guarantee
               any aspect of FHLMC PCs.
 
               The Federal National Mortgage Association ("FNMA") is a
               government-sponsored corporation owned entirely by private
               shareholders. It is subject to general regulation by the
               Secretary of Housing and Urban Development. FNMA purchases
               residential mortgages from a list of approved seller/servicers
               which include savings and loan associations, savings banks,
               commercial banks, credit unions and mortgage bankers. FNMA
               guarantees the timely payment of principal and interest on the
               pass-through securities issued by FNMA; the U.S. government does
               not guarantee any aspect of the FNMA pass-through securities.
 
               The Funds may also invest in privately-issued mortgage-backed
               securities to the extent permitted by their investment
               restrictions. Mortgage-backed securities offered by private
               issuers include pass-through securities comprised of pools of
               conventional residential mortgage loans; mortgage-backed bonds
               which are considered to be debt obligations of the institution
               issuing the bonds and which are collateralized by mortgage loans;
               and collateralized mortgage obligations ("CMOs") which are
               collateralized by mortgage-backed
 
 10
<PAGE> 
 
               securities issued by GNMA, FHLMC or FNMA or by pools of
               conventional mortgages.
 
               Asset-backed securities represent direct or indirect
               participations in, or are secured by and payable from, assets
               other than mortgage-backed assets such as motor vehicle
               installment sales contracts, installment loan contracts, leases
               of various types of real and personal property and receivables
               from revolving credit agreements (credit cards). Asset-backed
               securities have yield characteristics similar to those of
               mortgage-backed securities and, accordingly, are subject to many
               of the same risks.
 
Reverse Repurchase Agreements
 
               Reverse repurchase agreements are transactions in which a Fund
               sells a security and simultaneously commits to repurchase that
               security from the buyer at an agreed upon price on an agreed upon
               future date. The resale price in a reverse repurchase agreement
               reflects a market rate of interest that is not related to the
               coupon rate or maturity of the sold security. For certain demand
               agreements, there is no agreed upon repurchase date and interest
               payments are calculated daily, often based upon the prevailing
               overnight repurchase rate. The Funds will use the proceeds of
               reverse repurchase agreements only to satisfy unusually heavy
               redemption requests or for other temporary or emergency purposes
               without the necessity of selling portfolio securities.
 
               Generally, a reverse repurchase agreement enables the Fund to
               recover for the term of the reverse repurchase agreement all or
               most of the cash invested in the portfolio securities sold and to
               keep the interest income associated with those portfolio
               securities. Such transactions are only advantageous if the
               interest cost to the Fund of the reverse repurchase transaction
               is less than the cost of obtaining the cash otherwise. In
               addition, interest costs on the money received in a reverse
               repurchase agreement may exceed the return received on the
               investments made by a Fund with those monies.
 
                                                                              11
<PAGE> 
 
When-Issued and Delayed Delivery Securities
 
               Each Fund may purchase securities on a when-issued or delayed
               delivery basis. A Fund will enter into such transactions only
               when it has the intention of actually acquiring the securities.
               To facilitate such acquisitions, the Funds' custodian will
               segregate cash or high quality liquid assets in an amount at
               least equal to such commitments. On delivery dates for such
               transactions, the Fund will meet its obligations from maturities,
               sales of the segregated securities or from other available
               sources of cash. If a Fund chooses to dispose of the right to
               acquire a when-issued security prior to its acquisition, it
               could, as with the disposition of any other portfolio obligation,
               incur a gain or loss due to market fluctuation. At the time a
               Fund makes the commitment to purchase securities on a when-issued
               or delayed delivery basis, it will record the transaction as a
               purchase and thereafter reflect the value of such securities in
               determining its net asset value.
 
Investment Company Securities
 
               From time to time, the Funds may invest in securities of other
               investment companies. The Funds are subject to the provisions of
               Section 12(d)(1) of the 1940 Act. Funds managed by Janus Capital
               ("Janus Funds") may invest in securities of the Funds and any
               other money market funds managed by Janus Capital in excess of
               the limitations of Section 12(d)(1) under the terms of an SEC
               exemptive order obtained by Janus Capital and the Janus Funds.
 
Debt Obligations
 
               Janus Money Market Fund may invest in debt obligations of
               domestic issuers. In general, sales of these securities may not
               be made absent registration under the Securities Act of 1933 or
               the availability of an appropriate exemption. Pursuant to Section
               4(2) of the 1933 Act or Rule 144A adopted under the 1933 Act,
               however, some of these securities are eligible for resale to
               institutional investors, and accordingly, Janus Capital may
               determine that a liquid market exists for such a security
               pursuant to guidelines adopted by the Trustees.
 
 12
<PAGE> 
 
Obligations of Financial Institutions
 
               Janus Money Market Fund may invest in obligations of financial
               institutions. Examples of obligations in which the Fund may
               invest include negotiable certificates of deposit, bankers'
               acceptances, time deposits and other obligations of U.S. banks
               (including savings and loan associations) having total assets in
               excess of one billion dollars and U.S. branches of foreign banks
               having total assets in excess of ten billion dollars. The Fund
               may also invest in Eurodollar and Yankee bank obligations as
               discussed below and other U.S. dollar-denominated obligations of
               foreign banks having total assets in excess of ten billion
               dollars that Janus Capital believes are of an investment quality
               comparable to obligations of U.S. banks in which the Fund may
               invest.
 
               Certificates of deposit represent an institution's obligation to
               repay funds deposited with it that earn a specified interest rate
               over a given period. Bankers' acceptances are negotiable
               obligations of a bank to pay a draft which has been drawn by a
               customer and are usually backed by goods in international trade.
               Time deposits are non-negotiable deposits with a banking
               institution that earn a specified interest rate over a given
               period. Fixed time deposits, which are payable at a stated
               maturity date and bear a fixed rate of interest, generally may be
               withdrawn on demand by the Fund but may be subject to early
               withdrawal penalties and that could reduce the Fund's yield.
               Unless there is a readily available market for them, time
               deposits that are subject to early withdrawal penalties and that
               mature in more than seven days will be treated as illiquid
               securities.
 
               Eurodollar bank obligations are dollar-denominated certificates
               of deposit or time deposits issued outside the U.S. capital
               markets by foreign branches of U.S. banks and by foreign banks.
               Yankee bank obligations are dollar-denominated obligations issued
               in the U.S. capital markets by foreign banks.
 
               Foreign, Eurodollar (and to a limited extent, Yankee) bank
               obligations are subject to certain sovereign risks. One such risk
               is the possibility that a foreign government might prevent
               dollar-
 
                                                                              13
<PAGE> 
 
               denominated funds from flowing across its borders. Other risks
               include: adverse political and economic developments in a foreign
               country; the extent and quality of government regulation of
               financial markets and institutions; the imposition of foreign
               withholding taxes; and exploration or nationalization of foreign
               issuers.
 
U.S. Government Securities
 
               Janus Government Money Market Fund and to a lesser extent, Janus
               Money Market Fund, invest in U.S. Government Securities. U.S.
               Government Securities shall have the meaning set forth in the
               1940 Act. The 1940 Act defines U.S. Government Securities to
               include securities issued or guaranteed by the U.S. Government,
               its agencies and instrumentalities. U.S. Government Securities
               may also include repurchase agreements collateralized by and
               municipal securities escrowed with or refunded with U.S.
               government securities. U.S. Government Securities in which the
               Fund may invest include U.S. Treasury securities and obligations
               issued or guaranteed by U.S. government agencies and
               instrumentalities that are backed by the full faith and credit of
               the U.S. government, such as those guaranteed by the Small
               Business Administration or issued by the Government National
               Mortgage Association. In addition, U.S. Government Securities in
               which the Fund may invest include securities supported primarily
               or solely by the creditworthiness of the issuer, such as
               securities of the Federal National Mortgage Association, the
               Federal Home Loan Mortgage Corporation and the Tennessee Valley
               Authority. There is no guarantee that the U.S. government will
               support securities not backed by its full faith and credit.
               Accordingly, although these securities have historically involved
               little risk of loss of principal if held to maturity, they may
               involve more risk than securities backed by the full faith and
               credit of the U.S. government.
 
Municipal Securities
 
               The municipal securities in which Janus Tax-Exempt Money Market
               Fund may invest include municipal notes and short-term municipal
               bonds. Municipal notes are generally used to provide for the
               issuer's short-term capital needs and generally have
 
 14
<PAGE> 
 
               maturities of 397 days or less. Examples include tax anticipation
               and revenue anticipation notes, which generally are issued in
               anticipation of various seasonal revenues, bond anticipation
               notes, construction loan notes and tax-exempt commercial paper.
               Short-term municipal bonds may include "general obligation
               bonds," which are secured by the issuer's pledge of its faith,
               credit and taxing power for payment of principal and interest;
               "revenue bonds," which are generally paid from the revenues of a
               particular facility or a specific excise tax or other source; and
               "industrial development bonds," which are issued by or on behalf
               of public authorities to provide funding for various privately
               operated industrial and commercial facilities. The Fund may also
               invest in high quality participation interests in municipal
               securities. A more detailed description of various types of
               municipal securities is contained in Appendix B.
 
               When the assets and revenues of an agency, authority,
               instrumentality or other political subdivision are separate from
               those of the government creating the issuing entity and a
               security is backed only by the assets and revenues of the issuing
               entity, that entity will be deemed to be the sole issuer of the
               security. Similarly, in the case of an industrial development
               bond backed only by the assets and revenues of the
               non-governmental issuer, the non-governmental issuer will be
               deemed to be the sole issuer of the bond.
 
Municipal Leases
 
               Janus Money Market Fund and Janus Tax-Exempt Money Market Fund
               may invest in municipal leases. Municipal leases are municipal
               securities which may take the form of a lease or an installment
               purchase or conditional sales contract. Municipal leases are
               issued by state and local governments and authorities to acquire
               a wide variety of equipment and facilities. Municipal leases
               frequently have special risks not normally associated with
               general obligation or revenue bonds. Leases and installment
               purchase or conditional sale contracts (which normally provide
               for title to the leased asset to pass eventually to the
               government issuer) have
 
                                                                              15
<PAGE> 
 
               evolved as a means for governmental issuers to acquire property
               and equipment without meeting the constitutional and statutory
               requirements for the issuance of debt. The debt-issuance
               limitations of many state constitutions and statutes are deemed
               to be inapplicable because of the inclusion in many leases or
               contracts of "non-appropriation" clauses that provide that the
               governmental issuer has no obligation to make future payments
               under the lease or contract unless money is appropriated for such
               purpose by the appropriate legislative body on a yearly or other
               periodic basis. A Fund will only purchase municipal leases
               subject to a non-appropriation clause when the payment of
               principal and accrued interest is backed by an unconditional
               irrevocable letter of credit, or guarantee of a bank or other
               entity that meets the criteria described in the Prospectus under
               "Taxable Investments."
 
               In evaluating municipal lease obligations, Janus Capital will
               consider such factors as it deems appropriate, including: (a)
               whether the lease can be canceled; (b) the ability of the lease
               obligee to direct the sale of the underlying assets; (c) the
               general creditworthiness of the lease obligor; (d) the likelihood
               that the municipality will discontinue appropriating funding for
               the leased property in the event such property is no longer
               considered essential by the municipality; (e) the legal recourse
               of the lease obligee in the event of such a failure to
               appropriate funding; (f) whether the security is backed by a
               credit enhancement such as insurance; and (g) any limitations
               which are imposed on the lease obligor's ability to utilize
               substitute property or services other than those covered by the
               lease obligation. If a lease is backed by an unconditional letter
               of credit or other unconditional credit enhancement, then Janus
               Capital may determine that a lease is an eligible security solely
               on the basis of its evaluation of the credit enhancement.
 
               Municipal leases, like other municipal debt obligations, are
               subject to the risk of non-payment. The ability of issuers of
               municipal leases to make timely lease payments may be adversely
               impacted in general economic downturns and as relative
               governmental cost burdens are allocated and reallocated among
               federal, state and local governmental units. Such non-payment
               would result in a
 
 16
<PAGE> 
 
               reduction of income to the Funds, and could result in a reduction
               in the value of the municipal lease experiencing non-payment and
               a potential decrease in the net asset value of a Fund.
 
                                                                              17
<PAGE> 
Performance data
 
               A Fund may provide current annualized and effective annualized
               yield quotations based on its daily dividends. These quotations
               may from time to time be used in advertisements, shareholder
               reports or other communications to shareholders. All performance
               information supplied by the Funds in advertising is historical
               and is not intended to indicate future returns.
 
               In performance advertising, the Funds may compare their Shares'
               performance information with data published by independent
               evaluators such as Morningstar, Inc., Lipper Analytical Services,
               Inc., or CDC/Wiesenberger, IBC/Donoghue's Money Fund Report or
               other companies which track the investment performance of
               investment companies ("Fund Tracking Companies"). The Funds may
               also compare their Shares' performance information with the
               performance of recognized stock, bond and other indices,
               including but not limited to the Municipal Bond Buyers Indices,
               the Salomon Brothers Bond Index, the Lehman Bond Index, the
               Standard & Poor's 500 Composite Stock Price Index, the Dow Jones
               Industrial Average, U.S. Treasury bonds, bills or notes and
               changes in the Consumer Price Index as published by the U.S.
               Department of Commerce. The Funds may refer to general market
               performance over past time periods such as those published by
               Ibbotson Associates (for instance, its "Stocks, Bonds, Bills and
               Inflation Yearbook"). The Funds may also refer in such materials
               to mutual fund performance rankings and other data published by
               Fund Tracking Companies. Performance advertising may also refer
               to discussions of the Funds and comparative mutual fund data and
               ratings reported in independent periodicals, such as newspapers
               and financial magazines. The Funds may also compare the Shares'
               yield to those of certain U.S. Treasury obligations or other
               money market instruments.
 
               Any current yield quotation of the Shares which is used in such a
               manner as to be subject to the provisions of Rule 482(d) under
               the Securities Act of 1933, as amended, shall consist of an
               annualized historical yield, carried at least to the nearest
               hundredth of one percent, based on a specific seven calendar day
               period. Current yield shall be calculated by (a) determining the
               net change during a seven calendar day period in the value of a
 
 18
<PAGE> 
 
               hypothetical account having a balance of one Share at the
               beginning of the period, (b) dividing the net change by the value
               of the account at the beginning of the period to obtain a base
               period return, and (c) multiplying the quotient by 365/7 (i.e.,
               annualizing). For this purpose, the net change in account value
               will reflect the value of additional Shares purchased with
               dividends declared on the original Share and dividends declared
               on both the original Share and any such additional Shares, but
               will not reflect any realized gains or losses from the sale of
               securities or any unrealized appreciation or depreciation on
               portfolio securities. In addition, the Shares may advertise
               effective yield quotations. Effective yield quotations are
               calculated by adding 1 to the base period return, raising the sum
               to a power equal to 365/7, and subtracting 1 from the result
               (i.e., compounding).
 
               Janus Tax-Exempt Money Market Fund's tax equivalent yield is the
               rate an investor would have to earn from a fully taxable
               investment in order to equal such Shares' yield after taxes. Tax
               equivalent yields are calculated by dividing Janus Tax-Exempt
               Money Market Fund's yield by one minus the stated federal or
               combined federal and state tax rate. If only a portion of the
               Shares' yield is tax-exempt, only that portion is adjusted in the
               calculation.
 
               The Shares' current yield and effective yield for the seven day
               period ended October 31, 1998 is shown below.
 
   
<TABLE>
<CAPTION>
                                                         Seven-day         Effective
                       Fund Name                           Yield        Seven-day Yield
- ---------------------------------------------------------------------------------------
<S>                                                      <C>            <C>
Janus Money Market Fund - Service Shares                   5.08%             5.21%
Janus Government Money Market Fund - Service Shares        4.90%             5.02%
Janus Tax-Exempt Money Market Fund - Service Shares*       3.24%             3.30%
</TABLE>
    
 
   
*Janus Tax-Exempt Money Market Fund - Service Shares tax equivalent yield for
 the seven day period ended October 31, 1998 was 4.51%.
    
 
                                                                              19
<PAGE> 
 
               Although published yield information is useful to investors in
               reviewing a Fund's performance, investors should be aware that
               the Fund's yield fluctuates from day to day and that the Fund's
               yield for any given period is not an indication or representation
               by the Fund of future yields or rates of return on the Shares.
               Also, Financial Institutions may charge their customers direct
               fees in connection with an investment in a Fund, which will have
               the effect of reducing the Fund's net yield to those
               shareholders. The yield on a class of Shares is not fixed or
               guaranteed, and an investment in the Shares is not insured.
               Accordingly, yield information may not necessarily be used to
               compare Shares with investment alternatives which, like money
               market instruments or bank accounts, may provide a fixed rate of
               interest. In addition, because investments in the Funds are not
               insured or guaranteed, yield on the Shares may not necessarily be
               used to compare the Shares with investment alternatives which are
               insured or guaranteed.
 
DETERMINATION OF NET ASSET VALUE
 
               Pursuant to the rules of the SEC, the Trustees have established
               procedures to stabilize each Fund's net asset value at $1.00 per
               Share. These procedures include a review of the extent of any
               deviation of net asset value per Share as a result of fluctuating
               interest rates, based on available market rates, from the Fund's
               $1.00 amortized cost price per Share. Should that deviation
               exceed 1/2 of 1%, the Trustees will consider whether any action
               should be initiated to eliminate or reduce material dilution or
               other unfair results to shareholders. Such action may include
               redemption of Shares in kind, selling portfolio securities prior
               to maturity, reducing or withholding dividends and utilizing a
               net asset value per Share as determined by using available market
               quotations. Each Fund (i) will maintain a dollar-weighted average
               portfolio maturity of 90 days or less; (ii) will not purchase any
               instrument with a remaining maturity greater than 397 days or
               subject to a repurchase agreement having a duration of greater
               than 397 days; (iii) will limit portfolio investments, including
               repurchase agreements, to those U.S. dollar-denominated
               instruments that Janus Capital has determined present minimal
               credit
 
 20
<PAGE> 
 
               risks pursuant to procedures established by the Trustees; and
               (iv) will comply with certain reporting and recordkeeping
               procedures. The Trust has also established procedures to ensure
               that portfolio securities meet the Funds' high quality criteria.
 
                                                                              21
<PAGE> 
Investment adviser and 
           administrator
 
   
               As stated in the Prospectus, each Fund has an Investment Advisory
               Agreement with Janus Capital, 100 Fillmore Street, Denver,
               Colorado 80206-4928. Each Advisory Agreement provides that Janus
               Capital will furnish continuous advice and recommendations
               concerning the Funds' investments. The Funds have each agreed to
               compensate Janus Capital for its advisory services by the monthly
               payment of an advisory fee at the annual rate of .20% of the
               average daily net assets of each Fund. However, Janus Capital has
               agreed to waive .10% of the value of each Fund's average daily
               net assets of the advisory fee. Janus Capital has agreed to
               continue such waivers until at least the next annual renewal of
               the advisory agreements. In addition, the Funds pay brokerage
               commissions or dealer spreads and other expenses in connection
               with the execution of portfolio transactions.
    
 
   
               On behalf of the Shares, each of the Funds has also entered into
               an Administration Agreement with Janus Capital. Under the terms
               of the Administration Agreements, each of the Funds has agreed to
               compensate Janus Capital for administrative services at the
               annual rate of .40% of the value of the average daily net assets
               of the Shares for certain services, including custody, transfer
               agent fees and expenses, legal fees not related to litigation,
               accounting expenses, net asset value determination and fund
               accounting, recordkeeping, and blue sky registration and
               monitoring services, registration fees, expenses of shareholders'
               meetings and reports to shareholders, costs of preparing,
               printing and mailing the Shares' Prospectuses and Statements of
               Additional Information to current shareholders, and other costs
               of complying with applicable laws regulating the sale of Shares.
               Each Fund will pay those expenses not assumed by Janus Capital,
               including interest and taxes, fees and expenses of Trustees who
               are not affiliated with Janus Capital, audit fees and expenses,
               and extraordinary costs. Janus Capital has agreed to waive a
               portion of the administration fee, and accordingly the effective
               rate for calculating the administration fee payable by the Shares
               will be .30%. Janus Capital has agreed to continue such waivers
               until at least the next annual renewal of the advisory
               agreements.
    
 
 22
<PAGE> 
 
               Janus Capital may use all or a portion of its administration fee
               to compensate Financial Institutions for providing administrative
               services to their customers who invest in the Shares. The types
               of services that the Financial Institutions would provide include
               serving as the sole shareholder of record, shareholder
               recordkeeping, processing and aggregating purchase and redemption
               transactions, providing periodic statements, forwarding
               shareholder reports and other materials, and providing other
               similar services that the Funds would have to perform if they
               were dealing directly with the beneficial owners, rather than the
               Financial Institutions, as shareholders of record.
 
               The following table summarizes the advisory fees paid by the
               Funds for the fiscal years ended October 31:
 
   
<TABLE>
<CAPTION>
                                 1998                      1997                      1996
                        -----------------------   -----------------------   -----------------------
                         Advisory     Advisory     Advisory     Advisory     Advisory     Advisory
                        Fees Prior   Fees After   Fees Prior   Fees After   Fees Prior   Fees After
      Fund Name         to Waiver      Waiver     to Waiver      Waiver     to Waiver      Waiver
- ---------------------------------------------------------------------------------------------------
<S>                     <C>          <C>          <C>          <C>          <C>          <C>
Janus Money Market
  Fund                  $9,548,370   $4,774,185   $6,858,596   $3,429,298   $3,101,530   $1,550,765
Janus Government Money
  Market Fund             $944,654     $472,327     $362,308     $181,154     $330,914     $165,457
Janus Tax-Exempt Money
  Market Fund             $226,264     $113,132     $158,812      $79,406     $140,898      $70,449
</TABLE>
    
 
(1) February 15, 1995 (inception of Funds) to October 31, 1995.
 
               The following table summarizes the administration fees paid by
               the Shares for the fiscal year ended October 31:
 
   
<TABLE>
<CAPTION>
                                                              1998                     1997(1)
                                                     -----------------------   -----------------------
                                                       Admin-       Admin-       Admin-       Admin-
                                                     istration    istration    istration    istration
                                                     Fees Prior   Fees After   Fees Prior   Fees After
                     Fund Name                       to Waiver      Waiver     to Waiver      Waiver
- ------------------------------------------------------------------------------------------------------
<S>                                                  <C>          <C>          <C>          <C>
Janus Money Market Fund - Service Shares              $117,287     $87,965       $3,432       $2,574
Janus Government Money Market Fund - Service Shares      $2,554     $1,915        $4,565        $3,424
Janus Tax-Exempt Money Market Fund - Service Shares    $12,859       $9,644          $35           $28
</TABLE>
    
 
(1) November 22, 1996 (inception of Shares) to October 31, 1997.
 
                                                                              23
<PAGE> 
 
               Advisory fees are paid on the Fund level while administration
               fees are paid on the class level.
 
               The Advisory Agreements for each Fund were reexecuted on July 1,
               1997 (without amendment other than effective dates) and will
               continue in effect until July 1, 1999, and thereafter from year
               to year so long as such continuance is approved annually by a
               majority of the Trustees who are not parties to the Advisory
               Agreements or interested persons of any such party, and by either
               a majority of the Funds' outstanding voting shares or the
               Trustees. Each Advisory Agreement (i) may be terminated without
               the payment of any penalty by any Fund or Janus Capital on 60
               days' written notice; (ii) terminates automatically in the event
               of its assignment; and (iii) generally, may not be amended
               without the approval of a majority of the Trustees of the
               affected Fund, including the Trustees who are not interested
               persons of that Fund or Janus Capital and, to the extent required
               by the 1940 Act, the vote of a majority of the outstanding voting
               securities of that Fund.
 
               Janus Capital also acts as sub-adviser for a number of
               private-label mutual funds and provides separate account advisory
               services for institutional accounts. Investment decisions for
               each account managed by Janus Capital, including the Funds, are
               made independently from those for any other account that is or
               may in the future become managed by Janus Capital or its
               affiliates. If, however, a number of accounts managed by Janus
               Capital are contemporaneously engaged in the purchase or sale of
               the same security, the orders may be aggregated and/or the
               transactions may be averaged as to price and allocated equitably
               to each account. In some cases, this policy might adversely
               affect the price paid or received by an account or the size of
               the position obtained or liquidated for an account. Pursuant to
               an exemptive order granted by the SEC, the Funds and other funds
               advised by Janus Capital may also transfer daily uninvested cash
               balances into one or more joint trading accounts. Assets in the
               joint trading accounts are invested in money market instruments
               and the proceeds are allocated to the participating funds on a
               pro rata basis.
 
 24
<PAGE> 
 
               Kansas City Southern Industries, Inc. ("KCSI") owns approximately
               82% of the outstanding voting stock of Janus Capital, most of
               which it acquired in 1984. KCSI is a publicly traded holding
               company whose primary subsidiaries are engaged in transportation,
               information processing and financial services. Thomas H. Bailey,
               President and Chairman of the Board of Janus Capital, owns
               approximately 12% of its voting stock and, by agreement with
               KCSI, selects a majority of Janus Capital's Board.
 
               KCSI has announced its intention to separate its transportation
               and financial services businesses. KCSI is currently studying
               alternatives for completion of the separation that meet its
               business objectives without risking adverse tax consequences.
               KCSI expects completion of the separation to be contemplated in
               1999.
 
               Each account managed by Janus Capital has its own investment
               objective and is managed in accordance with that objective by a
               particular portfolio manager or team of portfolio managers. As a
               result, from time to time two or more different managed accounts
               may pursue divergent investment strategies with respect to
               investments or categories of investments.
 
               Janus Capital does not permit portfolio managers to purchase and
               sell securities for their own accounts except under the limited
               exceptions contained in Janus Capital's policy regarding personal
               investing by directors, officers and employees of Janus Capital
               and the Funds. The policy requires investment personnel and
               officers of Janus Capital, inside directors of Janus Capital and
               the Funds and other designated persons deemed to have access to
               current trading information to pre-clear all transactions in
               securities not otherwise exempt under the policy. Requests for
               trading authority will be denied when, among other reasons, the
               proposed personal transaction would be contrary to the provisions
               of the policy or would be deemed to adversely affect any
               transaction then known to be under consideration for or to have
               been effected on behalf of any client account, including the
               Funds.
 
               In addition to the pre-clearance requirement described above, the
               policy subjects investment personnel, officers and directors/
 
                                                                              25
<PAGE> 
 
               Trustees of Janus Capital and the Funds to various trading
               restrictions and reporting obligations. All reportable
               transactions are required to be reviewed for compliance with
               Janus Capital's policy. Those persons also may be required under
               certain circumstances to forfeit their profits made from personal
               trading.
 
               The provisions of the policy are administered by and subject to
               exceptions authorized by Janus Capital.
 
 26
<PAGE> 
Custodian, transfer agent and 
           certain affiliations
 
               UMB Bank, N.A. ("UMB"), P.O. Box 419226, Kansas City, Missouri
               64141-6226, is the Funds' current custodian. However, it is
               expected that Citibank, N.A., 111 Wall Street 24th Floor, Zone 5,
               New York, NY 10043, will replace UMB as custodian for the Funds
               in the first quarter of 1999. The custodian holds the Funds'
               assets in safekeeping and collects and remits the income thereon,
               subject to the instructions of each Fund.
 
               Janus Service Corporation, P.O. Box 173375, Denver, Colorado
               80217-3375, a wholly-owned subsidiary of Janus Capital, is the
               Funds' transfer agent. In addition, Janus Service provides
               certain other administrative, recordkeeping and shareholder
               relations services to the Funds. The Funds do not pay Janus
               Service a fee.
 
               Janus Distributors, Inc., 100 Fillmore Street, Denver, Colorado
               80206-4928, a wholly-owned subsidiary of Janus Capital, is a
               distributor of the Funds. Janus Distributors is registered as a
               broker-dealer under the Securities Exchange Act of 1934 and is a
               member of the National Association of Securities Dealers, Inc.
               Janus Distributors acts as the agent of the Funds in connection
               with the sale of their shares in all states in which the shares
               are registered and in which Janus Distributors is qualified as a
               broker-dealer. Under the Distribution Agreement, Janus
               Distributors continuously offers the Funds' shares and accepts
               orders at net asset value. No sales charges are paid by
               investors. Promotional expenses in connection with offers and
               sales of shares are paid by Janus Capital.
 
               Janus Capital also may make payments to selected broker-dealer
               firms or institutions which were instrumental in the acquisition
               of shareholders for the Funds or which performed services with
               respect to shareholder accounts. The minimum aggregate size
               required for eligibility for such payments, and the factors in
               selecting the broker-dealer firms and institutions to which they
               will be made, are determined from time to time by Janus Capital.
 
                                                                              27
<PAGE> 
Portfolio transactions and brokerage
 
               Decisions as to the assignment of portfolio business for the
               Funds and negotiation of its commission rates are made by Janus
               Capital, whose policy is to obtain the "best execution" (prompt
               and reliable execution at the most favorable security price) of
               all portfolio transactions.
 
               In selecting brokers and dealers and in negotiating commissions,
               Janus Capital considers a number of factors, including but not
               limited to: Janus Capital's knowledge of currently available
               negotiated commission rates or prices of securities currently
               available and other current transaction costs; the nature of the
               security being traded; the size and type of the transaction; the
               nature and character of the markets for the security to be
               purchased or sold; the desired timing of the trade; the activity
               existing and expected in the market for the particular security;
               confidentiality; the quality of the execution, clearance and
               settlement services; financial stability of the broker or dealer;
               the existence of actual or apparent operational problems of any
               broker or dealer; and research products or services provided. In
               recognition of the value of the foregoing factors, Janus Capital
               may place portfolio transactions with a broker or dealer with
               whom it has negotiated a commission that is in excess of the
               commission another broker or dealer would have charged for
               effecting that transaction if Janus Capital determines in good
               faith that such amount of commission was reasonable in relation
               to the value of the brokerage and research provided by such
               broker or dealer viewed in terms of either that particular
               transaction or of the overall responsibilities of Janus Capital.
               These research and other services may include, but are not
               limited to, general economic and security market reviews,
               industry and company reviews, evaluations of securities,
               recommendations as to the purchase and sale of securities and
               access to third party publications, computer and electronic
               equipment and software. Research received from brokers or dealers
               is supplemental to Janus Capital's own research efforts.
 
               For the fiscal year ended October 31, 1998, the Funds paid no
               brokerage commissions to brokers and dealers in transactions
 
 28
<PAGE> 
 
               identified for execution primarily on the basis of research and
               other services provided to the Funds.
 
               For the fiscal years ended October 31, 1998, October 31, 1997 and
               October 31, 1996, the total brokerage commissions paid by the
               Funds are summarized below:
 
   
<TABLE>
<CAPTION>
                 Fund Name                     1998       1997        1996
- ---------------------------------------------------------------------------
<S>                                            <C>       <C>         <C>
Janus Money Market Fund                        $0          $0        $4,851
Janus Government Money Market Fund             $0          $0          $0
Janus Tax-Exempt Money Market Fund             $0          $0          $0
</TABLE>
    
 
               The Funds generally buy and sell securities in principal
               transactions, in which no commissions are paid. However, the
               Funds may engage an agent and pay commissions for such
               transactions if Janus Capital believes that the net result of the
               transaction to the respective Fund will be no less favorable than
               that of contemporaneously available principal transactions.
 
               Janus Capital may use research products and services in servicing
               other accounts in addition to the Funds. If Janus Capital
               determines that any research product or service has a mixed use,
               such that it also serves functions that do not assist in the
               investment decision-making process, Janus Capital may allocate
               the costs of such service or product accordingly. Only that
               portion of the product or service that Janus Capital determines
               will assist it in the investment decision-making process may be
               paid for in brokerage commission dollars. Such allocation may
               create a conflict of interest for Janus Capital.
 
               Janus Capital may consider sales of Shares by a broker-dealer or
               the recommendation of a broker-dealer to its customers that they
               purchase Shares as a factor in the selection of broker-dealers to
               execute Fund portfolio transactions. Janus Capital may also
               consider payments made by brokers effecting transactions for a
               Fund (i) to the Fund or (ii) to other persons on behalf of the
               Fund for services provided to the Fund for which it would be
               obligated to pay. In placing portfolio business with such broker-
               dealers, Janus Capital will seek the best execution of each
               transaction.
 
                                                                              29
<PAGE> 
 
               When the Funds purchase or sell a security in the over-the-
               counter market, the transaction takes place directly with a
               principal market-maker, without the use of a broker, except in
               those circumstances where in the opinion of Janus Capital better
               prices and executions will be achieved through the use of a
               broker.
 
               As of October 31, 1998, certain Funds owned securities of their
               regular broker-dealers (or parents), as shown below:
 
   
<TABLE>
<CAPTION>
                                    Name of                  Value of
       Fund Name                 Broker-Dealer           Securities Owned
- -------------------------------------------------------------------------
<S>                      <C>                             <C>
Janus Money Market Fund  Banker's Trust Securities
                           Corp.                           $262,495,236
                         Merrill Lynch, Pierce, Fenner
                         & Smith, Inc.                     $139,999,803
                         Lehman Brothers, Inc              $300,000,000
                         Goldman Sachs Group L.P.          $300,000,000
                         Deutsche Morgan Grenfell, Inc.    $150,000,000
                         Bear Stearns Co., Inc.             $99,015,375
                         ABN AMRO Securities, Inc.         $586,000,000
                         BT Alex Brown, Inc.                $50,000,000
                         Salomon Smith Barney, Inc.        $675,000,000
                         HSBC America, Inc.                 $73,435,489
                         CIT Group, Inc.                   $149,881,540
                         Barclay Capital, Inc.             $250,000,000
Janus Government Money
  Market Fund            ABN AMRO Securities, Inc.          $93,200,000
                         CS First Boston, Inc.             $250,000,000
                         JP Morgan Securities, Inc.         $25,100,000
                         Salomon Smith Barney, Inc.        $125,000,000
</TABLE>
    
 
 30
<PAGE> 
Trustees and officers
 
               The following are the names of the Trustees and officers of the
               Trust, together with a brief description of their principal
               occupations during the last five years.
 
Thomas H. Bailey, Age 61 - Trustee, Chairman and President*#
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Trustee, Chairman and President of Janus Aspen Series. Chairman,
               Chief Executive Officer, Director and President of Janus Capital.
               Director of Janus Distributors, Inc.
 
James P. Craig, III, Age 42 - Trustee*#
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Trustee and Executive Vice President of Janus Aspen Series. Chief
               Investment Officer, Vice Chairman and Director of Janus Capital.
               Executive Vice President and Portfolio Manager of Janus Fund.
               Executive Vice President and Co-Manager of Janus Venture Fund.
 
Gary O. Loo, Age 58 - Trustee#
102 N. Cascade Avenue, Suite 500
Colorado Springs, CO 80903
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. President and Director of High
               Valley Group, Inc., Colorado Springs, CO (investments).
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
#Member of the Trust's Executive Committee.
 
                                                                              31
<PAGE> 
 
Dennis B. Mullen, Age 55 - Trustee
7500 E. McCormick Parkway, #24
Scottsdale, AZ 85258
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Private Investor. Formerly (1997-
               1998), Chief Financial Officer-Boston Market Concepts, Boston
               Chicken, Inc., Golden, CO (restaurant chain); (1993-1997),
               President and Chief Executive Officer of BC Northwest, L.P., a
               franchise of Boston Chicken, Inc., Bellevue, WA (restaurant
               chain).
 
James T. Rothe, Age 55 - Trustee
102 South Tejon Street, Suite 1100
Colorado Springs, CO 80903
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Professor of Business, University
               of Colorado, Colorado Springs, CO. Principal, Phillips-Smith
               Retail Group, Colorado Springs, CO (a venture capital firm).
               Formerly (1986-1994), Dean of the College of Business, University
               of Colorado, Colorado Springs, CO.
 
William D. Stewart, Age 54 - Trustee#
5330 Sterling Drive
Boulder, CO 80302
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. President of HPS Division of MKS
               Instruments, Boulder, CO (manufacturer of vacuum fittings and
               valves).
 
Martin H. Waldinger, Age 60 - Trustee
4940 Sandshore Court
San Diego, CA 92130
- --------------------------------------------------------------------------------
               Trustee of Janus Aspen Series. Private Consultant. Formerly (1993
               - 1996), Director of Run Technologies, Inc., a software
               development firm, San Carlos, CA.
 
- --------------------------------------------------------------------------------
#Member of the Trust's Executive Committee.
 
 32
<PAGE> 
 
Sharon S. Pichler, Age 49 - Executive Vice President*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
   
               Executive Vice President of Janus Money Market Fund, Janus
               Government Money Market Fund and Janus Tax-Exempt Money Market
               Fund. Portfolio Manager of Janus Money Market Fund and Janus
               Tax-Exempt Money Market Fund. Formerly, Portfolio Manager of
               Janus Government Money Market Fund (February 1995-February 1999).
               Vice President of Janus Capital. Formerly, Assistant Vice
               President and Portfolio Manager at USAA Investment Management Co.
               (1990-1994).
    
 
Thomas A. Early, Age 44 - Vice President and General Counsel*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Vice President and General Counsel of Janus Aspen Series. Vice
               President, General Counsel and Secretary of Janus Capital. Vice
               President and General Counsel of Janus Service Corporation, Janus
               Distributors, Inc. and Janus Capital International, Ltd. Director
               of Janus World Funds Plc. Formerly (1997-1998), Executive Vice
               President and General Counsel of Prudential Investments Fund
               Management LLC, Newark, NJ. Formerly (1994-1997), Vice President
               and General Counsel of Prudential Retirement Services, Newark,
               NJ. Formerly (1988-1994), Associate General Counsel and Chief
               Financial Services Counsel, Frank Russell Company, Tacoma, WA.
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
 
                                                                              33
<PAGE> 
 
Steven R. Goodbarn, Age 41 - Vice President and Chief Financial Officer*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Vice President and Chief Financial Officer of Janus Aspen Series.
               Vice President of Finance, Treasurer and Chief Financial Officer
               of Janus Capital, Janus Service Corporation and Janus
               Distributors, Inc. Director of Janus Service Corporation, Janus
               Distributors, Inc. and Janus World Funds Plc. Director, Treasurer
               and Vice President of Finance of Janus Capital International Ltd.
               Formerly (May 1992-January 1996), Treasurer of Janus Investment
               Fund and Janus Aspen Series.
 
Kelley Abbott Howes, Age 33 - Assistant Vice President and Secretary*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Assistant Vice President and Secretary of Janus Aspen Series.
               Director and President of Janus Distributors, Inc. Assistant Vice
               President and Associate Counsel of Janus Capital. Formerly (1990-
               1994), with The Boston Company Advisors, Inc., Boston, MA (mutual
               fund administration services).
 
Glenn P. O'Flaherty, Age 40 - Treasurer and Chief Accounting Officer*
100 Fillmore Street
Denver, CO 80206-4928
- --------------------------------------------------------------------------------
               Treasurer and Chief Accounting Officer of Janus Aspen Series.
               Vice President of Janus Capital. Formerly, (1991-1997) Director
               of Fund Accounting, Janus Capital.
 
- --------------------------------------------------------------------------------
*Interested person of the Trust and of Janus Capital.
 
 34
<PAGE> 
 
               The Trustees are responsible for major decisions relating to each
               Fund's objective, policies and techniques. The Trustees also
               supervise the operation of the Funds by their officers and review
               the investment decisions of the officers, although they do not
               actively participate on a regular basis in making such decisions.
 
               The Trust's Executive Committee shall have and may exercise all
               the powers and authority of the Trustees except for matters
               requiring action by all Trustees pursuant to the Trust's Bylaws
               or Declaration of Trust, Massachusetts Law or the 1940 Act.
 
               The Money Market Funds Committee, consisting of Messrs. Loo,
               Mullen and Rothe, monitors the compliance with policies and
               procedures adopted particularly for money market funds.
 
               The following table shows the aggregate compensation earned by
               and paid to each Trustee by the Funds described in this SAI and
               all funds advised and sponsored by Janus Capital (collectively,
               the "Janus Funds") for the periods indicated. None of the
               Trustees receives any pension or retirement benefits from the
               Funds or the Janus Funds.
 
   
<TABLE>
<CAPTION>
                                     Aggregate Compensation      Total Compensation
                                       from the Funds for     from the Janus Funds for
                                       fiscal year ended        calendar year ended
     Name of Person, Position           October 31, 1998        December 31, 1998**
- ---------------------------------------------------------------------------------------
<S>                                  <C>                     <C>
Thomas H. Bailey, Chairman and
  Trustee*                                     $0                        $0
James P. Craig, Trustee*                       $0                        $0
William D. Stewart, Trustee                 $ 5,754                   $82,000
Gary O. Loo, Trustee                        $13,896                   $74,000
Dennis B. Mullen, Trustee                   $12,531                   $82,000
Martin H. Waldinger, Trustee                $ 5,517                   $74,000
James T. Rothe, Trustee                     $11,913                   $82,000
</TABLE>
    
 
 *An interested person of the Funds and of Janus Capital. Compensated by Janus
  Capital and not the Funds.
**As of December 31, 1998, Janus Funds consisted of two registered investment
  companies comprised of a total of 32 funds.
 
                                                                              35
<PAGE> 
Purchase of shares
 
   
               Shares are sold at the net asset value per share as determined at
               the close of the regular trading session of the New York Stock
               Exchange (the "NYSE" or the "Exchange") next occurring after a
               purchase order is received and accepted by a Fund (except net
               asset value is determined at 5:00 p.m. (New York time) for Janus
               Government Money Market Fund). A Fund's net asset value is
               calculated each day that both the NYSE and the Federal Reserve
               Banks are open ("bank business day"). As stated in the
               Prospectus, the Funds each seek to maintain a stable net asset
               value per share of $1.00. The Shareholder's Guide Section of the
               Prospectus contains detailed information about the purchase of
               Shares.
    
 
Redemptions of shares
 
               Redemptions, like purchases, may only be effected through the
               trust accounts, cash management programs and similar programs of
               participating banks and financial institutions. Shares normally
               will be redeemed for cash, although each Fund retains the right
               to redeem its shares in kind under unusual circumstances, in
               order to protect the interests of remaining shareholders, by
               delivery of securities selected from its assets at its
               discretion. However, the Funds are governed by Rule 18f-1 under
               the 1940 Act, which requires each Fund to redeem shares solely in
               cash up to the lesser of $250,000 or 1% of the NAV of that Fund
               during any 90-day period for any one shareholder. Should
               redemptions by any shareholder exceed such limitation, a Fund
               will have the option of redeeming the excess in cash or in kind.
               If shares are redeemed in kind, the redeeming shareholder
               generally will incur brokerage costs in converting the assets to
               cash. The method of valuing securities used to make redemptions
               in kind will be the same as the method of valuing portfolio
               securities described under "Shares
 
 36
<PAGE> 
 
               of the Trust" and such valuation will be made as of the same time
               the redemption price is determined.
 
               The right to require the Funds to redeem its shares may be
               suspended, or the date of payment may be postponed, whenever (1)
               trading on the NYSE is restricted, as determined by the SEC, or
               the NYSE is closed except for holidays and weekends, (2) the SEC
               permits such suspension and so orders, or (3) an emergency exists
               as determined by the SEC so that disposal of securities or
               determination of NAV is not reasonably practicable.
 
                                                                              37
<PAGE> 
Shareholder accounts
 
               Detailed information about the general procedures for shareholder
               accounts is set forth in the Prospectus. Applications to open
               accounts may be obtained by calling or writing your Financial
               Institution.
 
Dividends and tax status
 
   
               Dividends representing substantially all of the net investment
               income and any net realized gains on sales of securities are
               declared daily, Saturdays, Sundays and holidays included, and
               distributed on the last business day of each month. If a month
               begins on a Saturday, Sunday or holiday, dividends for those days
               are declared at the end of the preceding month and distributed on
               the first business day of the month. A shareholder may receive
               dividends via wire transfer or may choose to have dividends
               automatically reinvested in a Fund's Shares. As described in the
               Prospectus, Shares purchased by wire on a bank business day will
               receive that day's dividend if the purchase request is received
               from a Financial Institution at or prior to 3:00 p.m. (New York
               time) for Janus Money Market Fund, 5:00 p.m. for Janus Government
               Money Market Fund and 12:00 p.m. for Janus Tax-Exempt Money
               Market Fund. Otherwise, such Shares will begin to accrue
               dividends on the first bank business day following receipt of the
               order. Requests for redemption of Shares will be redeemed at the
               next determined net asset value. Redemption requests made by wire
               that are received from a Financial Institution prior to 3:00 p.m.
               (New York time) for Janus Money Market Fund, 5:00 p.m. for Janus
               Government Money Market Fund and 12:00 p.m. for Janus Tax-Exempt
               Money Market Fund on a bank business day will result in Shares
               being redeemed that day. Proceeds of such a redemption will
               normally be sent to the
    
 
 38
<PAGE> 
 
               predesignated bank account on that day, but that day's dividend
               will not be received. Closing times for purchase and redemption
               of Shares may be changed for days in which the bond market or the
               NYSE close early.
 
               Distributions for all of the Funds (except Janus Tax-Exempt Money
               Market Fund) are taxable income and are subject to federal income
               tax (except for shareholders exempt from income tax), whether
               such distributions are received via wire transfer or are
               reinvested in additional Shares. Full information regarding the
               tax status of income dividends and any capital gains
               distributions will be mailed to shareholders for tax purposes on
               or before January 31st of each year. As described in detail in
               the Prospectus, Janus Tax-Exempt Money Market Fund anticipates
               that substantially all income dividends it pays will be exempt
               from federal income tax, although dividends attributable to
               interest on taxable investments, together with distributions from
               any net realized short- or long-term capital gains, are taxable.
 
               The Funds intend to qualify as regulated investment companies by
               satisfying certain requirements prescribed by Subchapter M of the
               Code. Accordingly, a Fund will invest no more than 25% of its
               total assets in a single issuer (other than U.S. government
               securities).
 
               Some money market securities employ a trust or other similar
               structure to modify the maturity, price characteristics, or
               quality of financial assets. For example, put features can be
               used to modify the maturity of a security, or interest rate
               adjustment features can be used to enhance price stability. If
               the structure does not perform as intended, adverse tax or
               investment consequences may result. Neither the Internal Revenue
               Service nor any other regulatory authority has ruled definitively
               on certain legal issues presented by structured securities.
               Future tax or other regulatory determinations could adversely
               affect the value, liquidity, or tax treatment of the income
               received from these securities or the nature and timing of
               distributions made by a Fund.
 
                                                                              39
<PAGE> 
Principal shareholders
 
   
               As of January 20, 1999, the officers and Trustees as a group
               owned less than 1% of the outstanding Shares
    
 
   
               As of January 20, 1999, the following shareholders owned more
               than 5% of the Shares of the Janus Money Market Fund:
    
   
<TABLE>
<CAPTION>
                                                                    Percentage
           Shareholders                        Address              Ownership
- -------------------------------------------------------------------------------
<S>                                 <C>                             <C>
UMB Bank                            P.O. Box 419232
                                    Kansas City, MO 64141-6232      10.50%
Norwest Investment Services, Inc.   608 2nd Avenue, South
                                    Minneapolis, MN 55402-1916      89.46%                                    
</TABLE>
    
 
   
               As of January 20, 1999, the following shareholder owned more than
               5% of the Shares of Janus Government Money Market Fund:
    
   
<TABLE>
<CAPTION>
                                                                Percentage
           Shareholder                         Address          Ownership
- -------------------------------------------------------------------------------
<S>                                 <C>                         <C>
EGAP & Co. Chittenden Trust Co.     P.O. Box 820
                                    Burlington, VT 05402-0820   98.71%
</TABLE>
    
 
   
               As of January 20, 1999, the following shareholder owned more than
               5% of the Shares of Janus Tax-Exempt Money Market Fund:
    
   
<TABLE>
<CAPTION>
                                                                 Percentage
           Shareholder                         Address           Ownership
- --------------------------------------------------------------------------------
<S>                                 <C>                          <C>
Norwest Investment Services, Inc.   608 2nd Avenue, South
                                    Minneapolis, MN 55402-1916   99.18%
</TABLE>
    
 
 40
<PAGE> 
Miscellaneous information
 
               Each Fund is a series of the Trust, a Massachusetts Business
               Trust that was created on February 11, 1986. The Trust is an
               open-end management investment company registered under the 1940
               Act. As of the date of this SAI, the Trust offers 21 separate
               series, three of which currently offer three classes of Shares.
 
               Janus Capital reserves the right to the name "Janus." In the
               event that Janus Capital does not continue to provide investment
               advice to the Funds, the Funds must cease to use the name "Janus"
               as soon as reasonably practicable.
 
               Under Massachusetts law, shareholders of the Funds could, under
               certain circumstances, be held liable for the obligations of
               their Fund. However, the Agreement and Declaration of Trust (the
               "Declaration of Trust") disclaims shareholder liability for acts
               or obligations of the Funds and requires that notice of this
               disclaimer be given in each agreement, obligation or instrument
               entered into or executed by the Funds or the Trustees. The
               Declaration of Trust also provides for indemnification from the
               assets of the Funds for all losses and expenses of any Fund
               shareholder held liable for the obligations of their Fund. Thus,
               the risk of a shareholder incurring a financial loss on account
               of its liability as a shareholder of one of the Funds is limited
               to circumstances in which their Fund would be unable to meet its
               obligations. The possibility that these circumstances would occur
               is remote. The Trustees intend to conduct the operations of the
               Funds to avoid, to the extent possible, liability of shareholders
               for liabilities of their Fund.
 
SHARES OF THE TRUST
 
               The Trust is authorized to issue an unlimited number of shares of
               beneficial interest with a par value of one cent per share for
               each series of the Trust. Shares of each Fund are fully paid and
               nonassessable when issued. All shares of a Fund participate
               equally in dividends and other distributions by such Fund, and in
               residual assets of that Fund in the event of liquidation. Shares
               of each Fund have no preemptive, conversion or subscription
               rights.
 
               The Trust is authorized to issue multiple classes of shares for
               each
 
                                                                              41
<PAGE> 
 
               Fund. Currently, Janus Money Market Fund, Janus Government Money
               Market Fund and Janus Tax-Exempt Money Market Fund each offer
               three classes of shares by separate prospectuses. The Shares
               discussed in this SAI are offered only through Financial
               Institutions that meet minimum investment requirements in
               connection with trust accounts, cash management programs and
               similar programs provided to their customers. A second class of
               shares, Institutional Shares, is offered to individual,
               institutional and corporate clients and foundations and trusts
               meeting certain minimum investment criteria. A third class of
               shares, Investor Shares, is offered to the general public.
 
SHAREHOLDER MEETINGS
 
               The Trust does not intend to hold annual shareholder meetings.
               However, special meetings may be called for a specific Fund or
               for the Trust as a whole for purposes such as electing or
               removing Trustees, terminating or reorganizing the Trust,
               changing fundamental policies, or for any other purpose requiring
               a shareholder vote under the 1940 Act. Separate votes are taken
               by each Fund only if a matter affects or requires the vote of
               only that Fund or that Fund's interest in the matter differs from
               the interest of other portfolios of the Trust. As a shareholder,
               you are entitled to one vote for each share that you own.
 
VOTING RIGHTS
 
               The present Trustees were elected at a meeting of the Trust's
               shareholders held on July 10, 1992, with the exception of Mr.
               Craig and Mr. Rothe who were appointed by the Trustees as of June
               30, 1995 and January 1, 1997, respectively. Under the Declaration
               of Trust, each Trustee will continue in office until the
               termination of the Trust or his earlier death, resignation,
               bankruptcy, incapacity or removal. Vacancies will be filled by a
               majority of the remaining Trustees, subject to the 1940 Act.
               Therefore, no annual or regular meetings of shareholders normally
               will be held, unless otherwise required by the Declaration of
               Trust or the 1940 Act. Subject to the foregoing, shareholders
               have the power to vote to elect or remove Trustees, to terminate
               or reorganize their Fund, to amend the Declaration of Trust, to
               bring
 
 42
<PAGE> 
 
               certain derivative actions and on any other matters on which a
               shareholder vote is required by the 1940 Act, the Declaration of
               Trust, the Trust's Bylaws or the Trustees.
 
               As mentioned above in "Shareholder Meetings," each share of each
               series of the Trust has one vote (and fractional votes for
               fractional shares). Shares of all series of the Trust have
               noncumulative voting rights, which means that the holders of more
               than 50% of the shares of all series of the Trust voting for the
               election of Trustees can elect 100% of the Trustees if they
               choose to do so and, in such event, the holders of the remaining
               shares will not be able to elect any Trustees.
 
INDEPENDENT ACCOUNTANTS
 
               PricewaterhouseCoopers LLP, 950 Seventeenth Street, Suite 2500,
               Denver, Colorado 80202, independent accountants for the Funds,
               audit the Funds' annual financial statements and prepare their
               tax returns.
 
REGISTRATION STATEMENT
 
               The Trust has filed with the SEC, Washington, D.C., a
               Registration Statement under the Securities Act of 1933, as
               amended, with respect to the securities to which this SAI
               relates. If further information is desired with respect to the
               Funds or such securities, reference is made to the Registration
               Statement and the exhibits filed as a part thereof.
 
                                                                              43
<PAGE> 
Financial statements
 
   
               The following audited financial statements of the Funds for the
               period ended October 31, 1998 are hereby incorporated by
               reference to the Funds' Annual Report dated October 31, 1998.
    
 
DOCUMENTS INCORPORATED BY REFERENCE TO THE ANNUAL REPORT
 
               Schedules of Investments as of October 31, 1998
 
               Statements of Operations for the period ended October 31, 1998
 
               Statements of Assets and Liabilities as of October 31, 1998
 
               Statements of Changes in Net Assets for the periods ended October
               31, 1998 and October 31, 1997
 
               Financial Highlights for each of the periods indicated
 
               Notes to Financial Statements
 
               Report of Independent Accountants
 
               The portions of such Annual Report that are not specifically
               listed above are not incorporated by reference into this SAI and
               are not part of the Registration Statement.
 
 44
<PAGE> 
Appendix A
 
DESCRIPTION OF SECURITIES RATINGS
 
MOODY'S AND STANDARD & POOR'S
 
               MUNICIPAL AND CORPORATE BONDS AND MUNICIPAL LOANS. The two
               highest ratings of Standard & Poor's Ratings Services for
               municipal and corporate bonds are AAA and AA. Bonds rated AAA
               have the highest rating assigned by S&P to a debt obligation.
               Capacity to pay interest and repay principal is extremely strong.
               Bonds rated AA have a very strong capacity to pay interest and
               repay principal and differ from the highest rated issues only in
               a small degree. The AA rating may be modified by the addition of
               a plus (+) or minus (-) sign to show relative standing within
               that rating category.
 
               The two highest ratings of Moody's Investors Service, Inc. for
               municipal and corporate bonds are Aaa and Aa. Bonds rated Aaa are
               judged by Moody's to be of the best quality. Bonds rated Aa are
               judged to be of high quality by all standards. Together with the
               Aaa group, they comprise what are generally known as high-grade
               bonds. Moody's states that Aa bonds are rated lower than the best
               bonds because margins of protection or other elements make
               long-term risks appear somewhat larger than Aaa securities. The
               generic rating Aa may be modified by the addition of the numerals
               1, 2 or 3. The modifier 1 indicates that the security ranks in
               the higher end of the Aa rating category; the modifier 2
               indicates a mid-range ranking; and the modifier 3 indicates that
               the issue ranks in the lower end of such rating category.
 
               SHORT TERM MUNICIPAL LOANS. S&P's highest rating for short-term
               municipal loans is SP-1. S&P states that short-term municipal
               securities bearing the SP-1 designation have a strong capacity to
               pay principal and interest. Those issues rated SP-1 which are
               determined to possess a very strong capacity to pay debt service
               will be given a plus (+) designation. Issues rated SP-2 have
               satisfactory capacity to pay principal and interest with some
               vulnerability to adverse financial and economic changes over the
               term of the notes.
 
               Moody's highest rating for short-term municipal loans is
               MIG-1/VMIG-1. Moody's states that short-term municipal securities
               rated MIG-1/VMIG-1 are of the best quality, enjoying strong
 
                                                                              45
<PAGE> 
 
               protection from established cash flows of funds for their
               servicing or from established and broad-based access to the
               market for refinancing, or both. Loans bearing the MIG-2/VMIG-2
               designation are of high quality, with margins of protection ample
               although not so large as in the MIG-1/VMIG-1 group.
 
               OTHER SHORT-TERM DEBT SECURITIES. Prime-1 and Prime-2 are the two
               highest ratings assigned by Moody's for other short-term debt
               securities and commercial paper, and A-1 and A-2 are the two
               highest ratings for commercial paper assigned by S&P. Moody's
               uses the numbers 1, 2 and 3 to denote relative strength within
               its highest classification of Prime, while S&P uses the numbers
               1, 2 and 3 to denote relative strength within its highest
               classification of A. Issuers rated Prime-1 by Moody's have a
               superior ability for repayment of senior short-term debt
               obligations and have many of the following characteristics:
               leading market positions in well-established industries, high
               rates of return on funds employed, conservative capitalization
               structure with moderate reliance on debt and ample asset
               protection, broad margins in earnings coverage of fixed financial
               charges and high internal cash generation, and well established
               access to a range of financial markets and assured sources of
               alternate liquidity. Issuers rated Prime-2 by Moody's have a
               strong ability for repayment of senior short-term debt
               obligations and display many of the same characteristics
               displayed by issuers rated Prime-1, but to a lesser degree.
               Issuers rated A-1 by S&P carry a strong degree of safety
               regarding timely repayment. Those issues determined to possess
               extremely strong safety characteristics are denoted with a plus
               (+) designation. Issuers rated A-2 by S&P carry a satisfactory
               degree of safety regarding timely repayment.
 
 46
<PAGE> 
 
FITCH
 
<TABLE>
                <S>                          <C>
                BOND RATING                  EXPLANATION
                ----------------------------------------------------------------
                F-1+........................ Exceptionally strong credit
                                             quality. Issues assigned this
                                             rating are regarded as having the
                                             strongest degree of assurance for
                                             timely payment.
                F-1......................... Very strong credit quality. Issues
                                             assigned this rating reflect an
                                             assurance for timely payment only
                                             slightly less in degree than issues
                                             rated F-1+.
                F-2......................... Good credit quality. Issues
                                             assigned this rating have a
                                             satisfactory degree of assurance
                                             for timely payments, but the margin
                                             of safety is not as great as the F-
                                             1+ and F-1 ratings.
</TABLE>
 
DUFF & PHELPS INC.
 
<TABLE>
                <S>                          <C>
                BOND RATING                  EXPLANATION
                ----------------------------------------------------------------
                Duff 1+..................... Highest certainty of timely
                                             payment. Short-term liquidity,
                                             including internal operating
                                             factors and/or ready access to
                                             alternative sources of funds, is
                                             clearly outstanding, and safety is
                                             just below risk-free U.S. Treasury
                                             short-term obligations.
                Duff 1...................... Very high certainty of timely
                                             payment. Liquidity factors are
                                             excellent and supported by good
                                             fundamental protection factors.
                                             Risk factors are minor.
                Duff 1...................... High certainty of timely payment.
                                             Liquidity factors are strong and
                                             supported by good fundamental
                                             protection factors. Risk factors
                                             are very small.
                Duff 2...................... Good certainty of timely payment.
                                             Liquidity factors and company
                                             fundamentals are sound. Although
                                             ongoing funding needs may enlarge
                                             total financing requirements,
                                             access to capital markets is good.
                                             Risk factors are small.
</TABLE>
 
                                                                              47
<PAGE> 
 
THOMSON BANKWATCH, INC.
 
<TABLE>
                <S>                          <C>
                BOND RATING                  EXPLANATION
                ----------------------------------------------------------------
                TBW-1....................... The highest category; indicates a
                                             very high degree of likelihood that
                                             principal and interest will be paid
                                             on a timely basis.
                TBW-2....................... The second highest category; while
                                             the degree of safety regarding
                                             timely repayment of principal and
                                             interest is strong, the relative
                                             degree of safety is not as high as
                                             for issues rated TBW-1.
                TBW-3....................... The lowest investment grade
                                             category; indicates that while more
                                             susceptible to adverse developments
                                             (both internal and external) than
                                             obligations with higher ratings,
                                             capacity to service principal and
                                             interest in a timely fashion is
                                             considered adequate.
                TBW-4....................... The lowest rating category; this
                                             rating is regarded as
                                             non-investment grade and therefore
                                             speculative.
</TABLE>
 
IBCA, INC.
 
<TABLE>
                <S>                          <C>
                BOND RATING                  EXPLANATION
                ----------------------------------------------------------------
                A1+......................... Obligations supported by the
                                             highest capacity for timely
                                             repayment. Where issues possess a
                                             particularly strong credit feature,
                                             a rating of A1+ is assigned.
                A2.......................... Obligations supported by a good
                                             capacity for timely repayment.
                A3.......................... Obligations supported by a
                                             satisfactory capacity for timely
                                             repayment.
                B........................... Obligations for which there is an
                                             uncertainty as to the capacity to
                                             ensure timely repayment.
                C........................... Obligations for which there is a
                                             high risk of default or which are
                                             currently in default.
</TABLE>
 
 48
<PAGE> 
Appendix B
 
DESCRIPTION OF MUNICIPAL SECURITIES
 
               MUNICIPAL NOTES generally are used to provide for short-term
               capital needs and usually have maturities of one year or less.
               They include the following:
 
               1. PROJECT NOTES, which carry a U.S. government guarantee, are
               issued by public bodies (called "local issuing agencies") created
               under the laws of a state, territory, or U.S. possession. They
               have maturities that range up to one year from the date of
               issuance. Project Notes are backed by an agreement between the
               local issuing agency and the Federal Department of Housing and
               Urban Development. These Notes provide financing for a wide range
               of financial assistance programs for housing, redevelopment, and
               related needs (such as low-income housing programs and renewal
               programs).
 
               2. TAX ANTICIPATION NOTES are issued to finance working capital
               needs of municipalities. Generally, they are issued in
               anticipation of various seasonal tax revenues, such as income,
               sales, use and business taxes, and are payable from these
               specific future taxes.
 
               3. REVENUE ANTICIPATION NOTES are issued in expectation of
               receipt of other types of revenues, such as Federal revenues
               available under the Federal Revenue Sharing Programs.
 
               4. BOND ANTICIPATION NOTES are issued to provide interim
               financing until long-term financing can be arranged. In most
               cases, the long-term bonds then provide the money for the
               repayment of the Notes.
 
               5. CONSTRUCTION LOAN NOTES are sold to provide construction
               financing. After successful completion and acceptance, many
               projects receive permanent financing through the Federal Housing
               Administration under the Federal National Mortgage Association
               ("Fannie Mae") or the Government National Mortgage Association
               ("Ginnie Mae").
 
               6. TAX-EXEMPT COMMERCIAL PAPER is a short-term obligation with a
               stated maturity of 365 days or less. It is issued by agencies of
               state and local governments to finance seasonal working capital
               needs or as short-term financing in anticipation of longer term
               financing.
 
                                                                              49
<PAGE> 
 
               MUNICIPAL BONDS, which meet longer term capital needs and
               generally have maturities of more than one year when issued, have
               three principal classifications:
 
               1. GENERAL OBLIGATION BONDS are issued by such entities as
               states, counties, cities, towns, and regional districts. The
               proceeds of these obligations are used to fund a wide range of
               public projects, including construction or improvement of
               schools, highways and roads, and water and sewer systems. The
               basic security behind General Obligation Bonds is the issuer's
               pledge of its full faith and credit and taxing power for the
               payment of principal and interest. The taxes that can be levied
               for the payment of debt service may be limited or unlimited as to
               the rate or amount of special assessments.
 
               2. REVENUE BONDS in recent years have come to include an
               increasingly wide variety of types of municipal obligations. As
               with other kinds of municipal obligations, the issuers of revenue
               bonds may consist of virtually any form of state or local
               governmental entity, including states, state agencies, cities,
               counties, authorities of various kinds, such as public housing or
               redevelopment authorities, and special districts, such as water,
               sewer or sanitary districts. Generally, revenue bonds are secured
               by the revenues or net revenues derived from a particular
               facility, group of facilities, or, in some cases, the proceeds of
               a special excise or other specific revenue source. Revenue bonds
               are issued to finance a wide variety of capital projects
               including electric, gas, water and sewer systems; highways,
               bridges, and tunnels; port and airport facilities; colleges and
               universities; and hospitals. Many of these bonds provide
               additional security in the form of a debt service reserve fund to
               be used to make principal and interest payments. Various forms of
               credit enhancement, such as a bank letter of credit or municipal
               bond insurance, may also be employed in revenue bond issues.
               Housing authorities have a wide range of security, including
               partially or fully insured mortgages, rent subsidized and/or
               collateralized mortgages, and/or the net revenues from housing or
               other public projects. Some authorities provide further security
               in the form of a state's ability (without
 
 50
<PAGE> 
 
               obligation) to make up deficiencies in the debt service reserve
               fund.
 
               In recent years, revenue bonds have been issued in large volumes
               for projects that are privately owned and operated (see 3 below).
 
               3. PRIVATE ACTIVITY BONDS are considered municipal bonds if the
               interest paid thereon is exempt from Federal income tax and are
               issued by or on behalf of public authorities to raise money to
               finance various privately operated facilities for business and
               manufacturing, housing and health. These bonds are also used to
               finance public facilities such as airports, mass transit systems
               and ports. The payment of the principal and interest on such
               bonds is dependent solely on the ability of the facility's user
               to meet its financial obligations and the pledge, if any, of real
               and personal property as security for such payment.
 
               While, at one time, the pertinent provisions of the Internal
               Revenue Code permitted private activity bonds to bear tax-exempt
               interest in connection with virtually any type of commercial or
               industrial project (subject to various restrictions as to
               authorized costs, size limitations, state per capita volume
               restrictions, and other matters), the types of qualifying
               projects under the Code have become increasingly limited,
               particularly since the enactment of the Tax Reform Act of 1986.
               Under current provisions of the Code, tax-exempt financing
               remains available, under prescribed conditions, for certain
               privately owned and operated rental multi-family housing
               facilities, nonprofit hospital and nursing home projects,
               airports, docks and wharves, mass commuting facilities and solid
               waste disposal projects, among others, and for the refunding
               (that is, the tax-exempt refinancing) of various kinds of other
               private commercial projects originally financed with tax-exempt
               bonds. In future years, the types of projects qualifying under
               the Code for tax-exempt financing are expected to become
               increasingly limited.
 
               Because of terminology formerly used in the Internal Revenue
               Code, virtually any form of private activity bond may still be
               referred to as an "industrial development bond," but more and
 
                                                                              51
<PAGE> 
 
               more frequently revenue bonds have become classified according to
               the particular type of facility being financed, such as hospital
               revenue bonds, nursing home revenue bonds, multi-family housing
               revenue bonds, single family housing revenue bonds, industrial
               development revenue bonds, solid waste resource recovery revenue
               bonds, and so on.
 
               OTHER MUNICIPAL OBLIGATIONS, incurred for a variety of financing
               purposes, include: municipal leases, which may take the form of a
               lease or an installment purchase or conditional sale contract,
               are issued by state and local governments and authorities to
               acquire a wide variety of equipment and facilities such as fire
               and sanitation vehicles, telecommunications equipment and other
               capital assets. Municipal leases frequently have special risks
               not normally associated with general obligation or revenue bonds.
               Leases and installment purchase or conditional sale contracts
               (which normally provide for title to the leased asset to pass
               eventually to the government issuer) have evolved as a means for
               governmental issuers to acquire property and equipment without
               meeting the constitutional and statutory requirements for the
               issuance of debt. The debt-issuance limitations of many state
               constitutions and statutes are deemed to be inapplicable because
               of the inclusion in many leases or contracts of
               "non-appropriation" clauses that provide that the governmental
               issuer has no obligation to make future payments under the lease
               or contract unless money is appropriated for such purpose by the
               appropriate legislative body on a yearly or other periodic basis.
               To reduce this risk, the Fund will only purchase municipal leases
               subject to a non-appropriation clause when the payment of
               principal and accrued interest is backed by an unconditional
               irrevocable letter of credit, or guarantee of a bank or other
               entity that meets the criteria described in the Prospectus.
 
               Tax-exempt bonds are also categorized according to whether the
               interest is or is not includible in the calculation of
               alternative minimum taxes imposed on individuals, according to
               whether the costs of acquiring or carrying the bonds are or are
               not deductible in part by banks and other financial institutions,
               and according to other criteria relevant for Federal income tax
               purposes. Due to the
 
 52
<PAGE> 
 
               increasing complexity of Internal Revenue Code and related
               requirements governing the issuance of tax-exempt bonds, industry
               practice has uniformly required, as a condition to the issuance
               of such bonds, but particularly for revenue bonds, an opinion of
               nationally recognized bond counsel as to the tax-exempt status of
               interest on the bonds.
 
                                                                              53
<PAGE> 
 
       [JANUS LOGO]
   
                1-800-29JANUS
    
                P.O. Box 173375
                Denver, Colorado 80217-3375
                janus.com
 
  3175
  
<PAGE> 
                           JANUS INVESTMENT FUND
                           PART C - OTHER INFORMATION

ITEM 23. Exhibits

         Exhibit 1     (a) Agreement and Declaration of Trust dated February
                           11, 1986, is incorporated herein by reference to
                           Exhibit 1(a) to Post-Effective Amendment No. 79.

                       (b) Certificate of Designation for Janus Growth and 
                           Income Fund is incorporated herein by reference to 
                           Exhibit 1(b) to Post-Effective Amendment No. 79.

                       (c) Certificate of Designation for Janus Worldwide Fund 
                           is incorporated herein by reference to Exhibit 1(c) 
                           to Post-Effective Amendment No. 79.

                       (d) Certificate of Designation for Janus Twenty Fund is 
                           incorporate herein by reference to Exhibit 1(d) to 
                           Post-Effective Amendment No. 80.

                       (e) Certificate of Designation for Janus Flexible Income 
                           Fund is incorporated herein by reference to Exhibit 
                           1(e) to Post-Effective Amendment No. 80.

                       (f) Certificate of Designation for Janus Intermediate 
                           Government Securities Fund filed as Exhibit 1(f) to 
                           Post-Effective Amendment No. 46 has been withdrawn.

                       (g) Certificate of Designation for Janus Venture Fund is 
                           incorporated herein by reference to Exhibit 1(g) to 
                           Post-Effective Amendment No. 80.

                       (h) Certificate of Designation for Janus Enterprise Fund
                           is incorporated herein by reference to Exhibit 1(h) 
                           to Post-Effective Amendment No. 80. 

                       (i) Certificate of Designation for Janus Balanced Fund is
                           incorporated herein by reference to Exhibit 1(i) to 
                           Post-Effective Amendment No. 80.

                       (j) Certificate of Designation for Janus Short-Term Bond 
                           Fund is incorporated herein by reference to Exhibit 
                           1(j) to Post-Effective Amendment No. 80.

                                      C-1
<PAGE>
                       (k) Certificate of Designation for Janus Federal Tax-
                           Exempt Fund is incorporated herein by reference to 
                           Exhibit 1(k) to Post-Effective Amendment No. 81.

                       (l) Certificate of Designation for Janus Mercury Fund is 
                           incorporated herein by reference to Exhibit 1(l) to 
                           Post-Effective Amendment No. 81.

                       (m) Certificate of Designation for Janus Overseas Fund is
                           incorporated herein by reference to Exhibit 1(m) to
                           Post-Effective Amendment No. 81.

                       (n) Form of Amendment to the Registrant's Agreement and 
                           Declaration of Trust is incorporated herein by 
                           reference to Exhibit 1(n) to Post-Effective Amendment
                           No. 81.

                       (o) Form of Certificate of Designation for Janus Money 
                           Market Fund, Janus Government Money Market Fund and 
                           Janus Tax-Exempt Money Market Fund is incorporated 
                           herein by reference to Exhibit 1(o) to Post-Effective
                           Amendment No. 81.

                       (p) Form of Certificate of Designation for Janus High-
                           Yield Fund and Janus Olympus Fund is incorporated 
                           herein by reference to Exhibit 1(p) to Post-Effective
                           Amendment No. 68.

                       (q) Certificate of Designation for Janus Equity Income 
                           Fund is incorporated herein by reference to Exhibit
                           1(q) to Post-Effective Amendment No. 72.

                       (r) Form of Certificate of Establishment and Designation
                           for Janus Special Situations Fund is incorporated
                           herein by reference to Exhibit 1(r) to Post-Effective
                           Amendment No. 75.

                       (s) Form of Amendment to Registrant's Agreement and 
                           Declaration of Trust is incorporated herein by 
                           reference to Exhibit 1(s) to Post-Effective Amendment
                           No. 75.

                       (t) Certificate of Establishment and Designation for 
                           Janus Global Life Sciences Fund filed as Exhibit 1(t)
                           to Post-Effective Amendment No. 82 has been 
                           withdrawn.

                                      C-2
<PAGE>
                       (u) Certificate of Establishment and Designation for 
                           Janus Global Life Sciences Fund is incorporated 
                           herein by reference to Exhibit 1(u) to Post-Effective
                           Amendment No. 85.

                       (v) Form of Certificate of Establishment and Designation 
                           for Janus Global Technology Fund is incorporated
                           herein by referenced to Exhibit 1(v) to Post-
                           Effective Amendment No. 85.

         Exhibit 2     (a) Restated Bylaws are incorporated herein by reference
                           to Exhibit 2(a) to Post-Effective Amendment No. 71.

                       (b) First Amendment to the Bylaws is incorporated herein
                           by reference to Exhibit 2(b) to Post-Effective
                           Amendment No. 71.

         Exhibit 3     (a) Specimen Stock Certificate for Janus Fund1 is 
                           incorporated herein by reference to Exhibit 4(b) to 
                           Post-Effective Amendment No. 79.

                       (b) Specimen Stock Certificate for Janus Growth and 
                           Income Fund is incorporated herein by reference to
                           Exhibit 4(b) to Post-Effective Amendment No. 79.

                       (c) Specimen Stock Certificate for Janus Worldwide Fund 
                           is incorporated herein by reference to Exhibit 4(c)
                           to Post-Effective Amendment No. 79.

                       (d) Specimen Stock Certificate for Janus Twenty Fund(1) 
                           is incorporated herein by reference to Exhibit 4(d)
                           to Post-Effective Amendment No. 80.

                       (e) Specimen Stock Certificate for Janus Flexible Income 
                           Fund(1) is incorporated herein by reference to
                           Exhibit 4(e) to Post-Effective Amendment No. 80.

                       (f) Specimen Stock Certificate for Janus Intermediate 
                           Government Securities Fund(1) filed as Exhibit 4(f) 
                           to Post-Effective Amendment No. 46 has been 
                           withdrawn.

                       (g) Specimen Stock Certificate for Janus Venture Fund(1) 
                           is 

- -------------------
(1) Outstanding certificates representing shares of predecessor entity to this
series of the Trust are deemed to represent shares of this series.

                                      C-3
<PAGE>                           
                           incorporated herein by reference to Exhibit 4(g)
                           to Post-Effective Amendment No. 80.

                       (h) Specimen Stock Certificate for Janus Enterprise Fund 
                           is incorporated herein by reference to Exhibit 4(h)
                           to Post-Effective Amendment No. 80.

                       (i) Specimen Stock Certificate for Janus Balanced Fund 
                           is incorporated herein by reference to Exhibit 4(i) 
                           to Post-Effective Amendment No. 80.

                       (j) Specimen Stock Certificate for Janus Short-Term Bond
                           Fund is incorporated herein by reference to Exhibit 
                           4(j) to Post-Effective Amendment No. 80.

                       (k) Specimen Stock Certificate for Janus Federal Tax-
                           Exempt Fund is incorporated herein by reference to 
                           Exhibit 4(k) to Post-Effective Amendment No. 81.

                       (l) Specimen Stock Certificate for Janus Mercury Fund is
                           incorporated herein by reference to Exhibit 4(l) to
                           Post-Effective Amendment No. 81.

                       (m) Specimen Stock Certificate for Janus Overseas Fund 
                           is incorporated herein by reference to Exhibit 4(m)
                           to Post-Effective Amendment No. 81.

                       (n) Revised Specimen Stock Certificates for Janus High-
                           Yield Fund and Janus Olympus Fund are incorporated 
                           herein by reference to Exhibit 4(n) to Post-
                           Effective Amendment No. 79.

                       (o) Revised Specimen Stock Certificate for Janus Equity 
                           Income Fund is incorporated herein by reference to
                           Exhibit 4(o) to Post-Effective Amendment No. 79.

                       (p) Revised Specimen Stock Certificate for Janus Special
                           Situations Fund is incorporated herein by reference
                           to Exhibit 4(p) to Post-Effective Amendment No. 79.

                       (q) Specimen Stock Certificate for Janus Global Life 
                           Sciences Fund filed as Exhibit 4(q) to Post-
                           Effective Amendment No. 82 has been withdrawn.

                       (r) Form of Specimen Stock Certificate for Janus Global
                           Life

                                      C-4
<PAGE>
                           Sciences Fund is incorporated herein by 
                           reference to Exhibit 3(r) to Post-Effective 
                           Amendment No. 85.

                       (s) Form of Specimen Stock Certificate for Janus Global 
                           Technology Fund is incorporated herein by reference 
                           to Exhibit 3(s) to Post-Effective Amendment No. 85.

         Exhibit 4     (a) Investment Advisory Agreement for Janus Fund dated
                           July 1, 1997, is incorporated herein by reference
                           to Exhibit 5(a) to Post-Effective Amendment No. 83.

                       (b) Investment Advisory Agreements for Janus Growth and 
                           Income Fund and Janus Worldwide Fund dated July 1,
                           1997, are incorporated herein by reference to 
                           Exhibit 5(b) to Post-Effective Amendment No. 83.

                       (c) Investment Advisory Agreements for Janus Twenty Fund
                           and Janus Venture Fund dated July 1, 1997, are
                           incorporated herein by reference to Exhibit 5(c) to 
                           Post-Effective Amendment No. 83.

                       (d) Investment Advisory Agreement for Janus Flexible 
                           Income Fund dated July 1, 1997, is incorporated 
                           herein by reference to Exhibit 5(d) to Post-
                           Effective Amendment No. 83.

                       (e) Investment Advisory Agreements for Janus Enterprise 
                           Fund, Janus Balanced Fund, and Janus Short-Term
                           Bond Fund dated July 1, 1997, are incorporated 
                           herein by reference to Exhibit 5(e) to Post-
                           Effective Amendment No. 83.

                       (f) Investment Advisory Agreements for Janus Federal 
                           Tax-Exempt Fund and Janus Mercury Fund dated July 1,
                           1997, are incorporated herein by reference to 
                           Exhibit 5(f) to Post-Effective Amendment No. 83.

                       (g) Investment Advisory Agreement for Janus Overseas 
                           Fund dated July 1, 1997, is incorporated herein by
                           reference to Exhibit 5(g) to Post-Effective 
                           Amendment No. 83.

                       (h) Investment Advisory Agreements for Janus Money 
                           Market Fund, Janus Government Money Market Fund, and
                           Janus Tax-Exempt Money Market Fund dated July 1, 
                           1997, are incorporated herein by reference to 
                           Exhibit 5(h) to Post-

                                      C-5
<PAGE>
                           Effective Amendment No. 83.

                       (i) Investment Advisory Agreement for Janus High-Yield 
                           Fund dated July 1, 1997, is incorporated herein by
                           reference to Exhibit 5(i) to Post-Effective
                           Amendment No. 83.

                       (j) Investment Advisory Agreement for Janus Olympus Fund
                           dated July 1, 1997, is incorporated herein by
                           reference to Exhibit 5(j) to Post-Effective 
                           Amendment No. 83.

                       (k) Investment Advisory Agreement for Janus Equity 
                           Income Fund dated July 1, 1997, is incorporated 
                           herein by reference to Exhibit 5(k) to Post-
                           Effective Amendment No. 83.

                       (l) Investment Advisory Agreement for Janus Special 
                           Situations Fund dated July 1, 1997, is incorporated
                           herein by reference to Exhibit 5(l) to Post-
                           Effective Amendment No. 83.

                       (m) Investment Advisory Agreement for Janus Global Life 
                           Sciences Fund filed as Exhibit 5(m) to Post-
                           Effective Amendment No. 82 has been withdrawn.

                       (n) Form of Investment Advisory Agreement for Janus 
                           Global Life Sciences Fund is incorporated herein by 
                           reference to Exhibit 4(n) to Post-Effective 
                           Amendment No. 85.

                       (o) Form of Investment Advisory Agreement for Janus 
                           Global Technology Fund is incorporated herein by 
                           reference to Exhibit 4(o) to Post-Effective 
                           Amendment No. 85.

      Exhibit 5            Distribution Agreement between Janus Investment Fund
                           incorporated herein by reference to Exhibit 6 to 
                           Post-Effective Amendment No. 83.

      Exhibit 6            Not Applicable.

      Exhibit 7        (a) Custodian Contract between Janus Investment Fund and
                           State Street Bank and Trust Company is incorporated 
                           herein by reference to Exhibit 8(a) to Post-
                           Effective Amendment No. 79.

                                      C-6
<PAGE>
                       (b) Amendment dated April 25, 1990, of State Street 
                           Custodian Contract is incorporated herein by 
                           reference to Exhibit 8(b) to Post-Effective
                           Amendment No. 79.

                       (c) Letter Agreement dated February 1, 1991, regarding 
                           State Street Custodian Contract is incorporated
                           herein by reference to Exhibit 8(c) to Post-
                           Effective Amendment No. 79.

                       (d)  Custodian Contract between Janus Investment Fund and
                            Investors Fiduciary Trust Company filed as Exhibit 
                            8(d) to Post-Effective Amendment No. 79 has been 
                            withdrawn.

                       (e) Letter Agreement dated October 9, 1992, regarding 
                           State Street Custodian Agreement is incorporated
                           herein by reference to Exhibit 8(e) to Post-
                           Effective Amendment No. 81.

                       (f) Letter Agreement dated April 28, 1993, regarding 
                           State Street Custodian Agreement is incorporated
                           herein by reference to Exhibit 8(f) to Post-
                           Effective Amendment No. 81.

                       (g) Letter Agreement dated April 4, 1994, regarding 
                           State Street Custodian Agreement is incorporated
                           herein by reference to Exhibit 8(g) to Post-
                           Effective Amendment No. 81.

                       (h) Form of Custody Agreement between Janus Investment 
                           Fund, on behalf of Janus Money Market Fund, Janus
                           Government Money Market Fund and Janus Tax-Exempt 
                           Money Market Fund, and United Missouri Bank, N.A. is
                           incorporated herein by reference to Exhibit 8(h) to 
                           Post-Effective Amendment No. 81.

                       (i) Letter Agreement dated December 12, 1995, regarding 
                           State Street Custodian Contract is incorporated
                           herein by reference to Exhibit 8(i) to Post-
                           Effective Amendment No. 72.

                       (j) Amendment dated October 11, 1995, of State Street 
                           Custodian Contract is incorporated herein by 
                           reference to Exhibit 8(j) to Post-Effective
                           Amendment No. 71.

                       (k) Form of Amendment dated September 10, 1996, of State
 
                                    C-7
<PAGE>
                           Street Custodian Contract is incorporated herein by
                           reference to Exhibit 8(k) to Post-Effective 
                           Amendment No. 75.

                       (l) Letter Agreement dated September 10, 1996, regarding
                           State Street Custodian Contract is incorporated     
                           herein by reference to Exhibit 8(l) to Post-
                           Effective Amendment No. 75.

                       (m) Form of Subcustodian Contract between United 
                           Missouri Bank, N.A., and State Street Bank and Trust
                           Company is incorporated herein by reference to 
                           Exhibit 8(m) to Post-Effective Amendment No. 75.

                       (n) Form of Letter Agreement dated September 9, 1997, 
                           regarding State Street Custodian Contract is
                           incorporated herein by reference to Exhibit 8(n) to
                           Post-Effective Amendment No. 82.

                       (o) Form of Letter Agreement dated September 14, 1998, 
                           regarding State Street Custodian Contract is
                           incorporated herein by reference to Exhibit 7(o) to
                           Post-Effective Amendment No. 85.

      Exhibit 8        (a) Transfer Agency Agreement with Investors Fiduciary 
                           Trust Company filed as Exhibit 9(a) to Post-
                           Effective Amendment No. 79 has been withdrawn.

                       (b) Subagency Agreement between Janus Service
                           Corporation and Investors Fiduciary Trust Company 
                           filed as Exhibit 9(b) to Post-Effective Amendment 
                           No. 79 has been withdrawn.

                       (c) Form of Administration Agreement with Janus Capital
                           Corporation for Janus Money Market Fund, Janus
                           Government Money Market Fund and Janus Tax-Exempt 
                           Money Market Fund is incorporated herein by
                           reference to Exhibit 9(c) to Post-Effective
                           Amendment No. 81.

                       (d) Transfer Agency Agreement dated December 9, 1994, 
                           with Janus Service Corporation for Janus Money 
                           Market Fund, Janus Government Money Market Fund and
                           Janus Tax-Exempt Money Market Fund filed as Exhibit
                           9(d) to Post-Effective Amendment No. 64 has been 
                           withdrawn.

                                      C-8
<PAGE>
                       (e) Transfer Agency Agreement dated September 27, 1995, 
                           with Janus Service Corporation for Janus Money 
                           Market Fund, Janus Government Money Market Fund, 
                           Janus Tax-Exempt Money Market Fund, Janus High-Yield
                           Fund and Janus Olympus Fund is incorporated herein 
                           by reference to Exhibit 9(e) to Post-Effective
                           Amendment No. 70.

                       (f) Letter Agreement dated December 21, 1995, regarding 
                           Janus Service Corporation Transfer Agency Agreement 
                           is incorporated herein by reference to Exhibit 9(f) 
                           to Post-Effective Amendment No. 72.

                       (g) Letter Agreement dated May 21, 1996, regarding Janus
                           Service Corporation Transfer Agency Agreement is
                           incorporated by reference to Exhibit 9(g) to Post-
                           Effective Amendment No. 73.

                       (h) Form of Amended Administration Agreement with Janus
                           Capital Corporation for Janus Money Market Fund, 
                           Janus Government Money Market Fund, and Janus Tax-
                           Exempt Money Market Fund is incorporated by
                           reference to Exhibit 9(h) to Post-Effective 
                           Amendment No. 77.

                       (i) Letter Agreement dated September 10, 1996, regarding
                           Janus Service Corporation Transfer Agency Agreement
                           is incorporated herein by reference to Exhibit 9(i)
                           to Post-Effective Amendment No. 76.

                       (j) Letter Agreement dated September 9,1997, regarding
                           Janus Service Corporation Transfer Agency Agreement 
                           is incorporated herein by reference to Exhibit 9(j) 
                           to Post-Effective Amendment No. 82.

                       (k) Form of Letter Agreement dated September 14, 1998, 
                           regarding Janus Service Corporation Transfer Agency
                           Agreement is incorporated herein by reference to 
                           Exhibit 8(k) to Post-Effective Amendment No. 85.

      Exhibit 9        (a) Opinion and Consent of Messrs. Davis, Graham & 
                           Stubbs with respect to shares of Janus Fund is 
                           incorporated herein by reference to Exhibit 10 (a)  
                           to Post-Effective Amendment No. 79.

                       (b) Opinion and Consent of Fund Counsel with respect to 
                           shares of Janus Growth and Income Fund and Janus

                                      C-9
<PAGE>
                           Worldwide Fund is incorporated herein by reference 
                           to Exhibit 10(b) to Post-Effective Amendment No. 79.

                       (c) Opinion and Consent of Fund Counsel with respect to 
                           shares of Janus Enterprise Fund, Janus Balanced Fund
                           and Janus Short-Term Bond Fund is incorporated 
                           herein by reference to Exhibit 10(c) to Post-
                           Effective Amendment No. 80.

                       (d) Opinion and Consent of Messrs. Sullivan and 
                           Worcester with respect to shares of Janus Twenty 
                           Fund is incorporated herein by reference to Exhibit
                           10(d) to Post-Effective Amendment No. 81.

                       (e) Opinion and Consent of Messrs. Sullivan and 
                           Worcester with respect to shares of Janus Venture 
                           Fund is incorporated herein by reference to Exhibit
                           10(e) to Post-Effective Amendment No. 81.

                       (f) Opinion and Consent of Messrs. Sullivan and 
                           Worcester with respect to shares of Janus Flexible 
                           Income Fund is incorporated herein by reference to 
                           Exhibit 10(f) to Post-Effective Amendment No. 81.

                       (g) Opinion and Consent of Messrs. Sullivan and 
                           Worcester with respect to shares of Janus 
                           Intermediate Government Securities Fund filed as
                           Exhibit 10(g) to Post-Effective Amendment No. 46 has
                           been withdrawn.

                       (h) Opinion and Consent of Fund Counsel with respect to
                           shares of Janus Federal Tax-Exempt Fund and Janus
                           Mercury Fund is incorporated herein by reference to
                           Exhibit 10(h) to Post-Effective Amendment No. 81.

                       (i) Opinion and Consent of Fund Counsel with respect to
                           shares of Janus Overseas Fund is incorporated herein
                           by reference to Exhibit 10(i) to Post-Effective
                           Amendment No. 81.

                       (j) Opinion and Consent of Fund Counsel with respect to 
                           shares of Janus Money Market Fund, Janus Government
                           Money Market Fund and Janus Tax-Exempt Money Market 
                           Fund is incorporated herein by reference to Exhibit
                           10(j) to Post-Effective Amendment No. 81.

                                      C-10
<PAGE>

                       (k) Opinion and Consent of Fund Counsel with respect to 
                           Institutional Shares of Janus Money Market Fund, 
                           Janus Government Money Market Fund and Janus Tax-
                           Exempt Money Market Fund is incorporated herein b
                           reference to Exhibit 10(k) to Post-Effective
                           Amendment No. 81.

                       (l) Opinion and Consent of Fund Counsel with respect to 
                           shares of Janus High-Yield Fund and Janus Olympus
                           Fund is incorporated herein by reference to Exhibit 
                           10(l) to Post-Effective Amendment No. 68.

                       (m) Opinion and Consent of Fund Counsel with respect to 
                           shares of Janus Equity Income Fund is incorporated
                           herein by reference to Exhibit 10(m) to Post-
                           Effective Amendment No. 72.

                       (n) Opinion and Consent of Fund Counsel with respect to 
                           shares of Janus Special Situations Fund is 
                           incorporated herein by reference to Exhibit 10(n) to
                           Post-Effective Amendment No. 75.

                       (o) Opinion and Consent of Fund Counsel with respect to 
                           shares of Janus Money Market Fund, Janus Government
                           Money Market Fund, and Janus Tax-Exempt Money Market
                           Fund is incorporated herein by reference to Exhibit 
                           10(o) to Post-Effective Amendment No. 76.

                       (p) Opinion and Consent of Fund Counsel with respect to 
                           shares of Janus Global Life Sciences Fund filed as
                           Exhibit 10(p) to Post-Effective Amendment No. 82 has
                           been withdrawn.

                       (q) Opinion and Consent of Fund Counsel with respect to 
                           shares of Janus Global Life Sciences Fund and Janus
                           Global Technology Fund is incorporated herein by
                           reference to Exhibit 9(q) to Post-Effective 
                           Amendment No. 85.

      Exhibit 10           Consent of PricewaterhouseCoopers LLP is filed 
                           herein as Exhibit 10.

      Exhibit 11           Not Applicable.

      Exhibit 12           Not Applicable.

                                      C-11
<PAGE>

      Exhibit 13           Not Applicable.

      Exhibit 14           Financial Data Schedules for all of the Funds (or 
                           classes of shares thereof) (except Janus Global Life
                           Sciences Fund and Janus Global Technology Fund) are 
                           filed herein as Exhibit 14:

      Exhibit 15       (a) Form of plan entered into by Janus Money Market 
                           Fund, Janus Government Money Market Fund and Janus
                           Tax-Exempt Money Market Fund pursuant to Rule 18f-3
                           setting forth the separate arrangement and expense
                           allocation of each class of such Funds filed as 
                           Exhibit 18 to Post-Effective Amendment No. 66 has
                           been withdrawn.

                       (b) Restated form of Rule 18f-3 Plan entered into by 
                           Janus Money Market Fund, Janus Government Money 
                           Market Fund and Janus Tax-Exempt Money Market Fund 
                           is incorporated herein by reference to Exhibit 18(b)
                           to Post-Effective Amendment No. 69.

                       (c) Amended and Restated form of Rule 18f-3 Plan entered
                           into by Janus Money Market Fund, Janus Government
                           Money Market Fund, and Janus Tax-Exempt Money Market
                           Fund is incorporated herein by reference to Exhibit
                           18(c) to Post-Effective Amendment No. 78.

ITEM 24. Persons Controlled by or Under Common Control with Fund

                  None

ITEM 25. Indemnification

Article VIII of Janus Investment Fund's Agreement and Declaration of
Trust provides for indemnification of certain persons acting on behalf of the
Funds. In general, Trustees and officers will be indemnified against liability
and against all expenses of litigation incurred by them in connection with any
claim, action, suit or proceeding (or settlement of the same) in which they
become involved by virtue of their Fund office, unless their conduct is
determined to constitute willful misfeasance, bad faith, gross negligence or
reckless disregard of their duties, or unless it has been determined that they
have not acted in good faith in the reasonable belief that their actions were in
or not opposed to the best interests of the Funds. A determination that a person
covered by the indemnification provisions is entitled to indemnification may be
made by the court or other body before which the proceeding is brought, or by
either a vote of a majority of a quorum of Trustees who are neither "interested
persons" of the Trust nor parties to the proceeding or by an independent legal
counsel in a written opinion. The Funds also may


                                      C-12
<PAGE>
advance money for these expenses, provided that the Trustee or officer
undertakes to repay the Funds if his conduct is later determined to preclude
indemnification, and that either he provide security for the undertaking, the 
Trust be insured against losses resulting from lawful advances or a majority of
a quorum of disinterested Trustees, or independent counsel in a written opinion,
determines that he ultimately will be found to be entitled to indemnification. 
The Trust also maintains a liability insurance policy covering its Trustees and 
officers.


ITEM 26. Business and Other Connections of Investment Adviser

     The only business of Janus Capital Corporation is to serve as the
investment adviser of the Fund and as investment adviser or subadviser to
several other mutual funds and private and retirement accounts. Business
backgrounds of the principal executive officers and directors of the adviser
that also hold positions with the Registrant are included under "Officers and
Trustees" in the currently effective Statements of Additional Information of the
Registrant. The remaining principal executive officers of the investment adviser
and their positions with the adviser and affiliated entities are: Mark B.
Whiston, Vice President and Chief Marketing Officer of Janus Capital
Corporation, Director and President of Janus Capital International Ltd.,
Director of Janus World Funds Plc; Marjorie G. Hurd, Vice President and Chief
Operations Officer of Janus Capital Corporation, Director and President of Janus
Service Corporation; and Stephen L. Stieneker, Assistant General Counsel, Chief
Compliance Officer and Vice President of Compliance of Janus Capital
Corporation. Mr. Michael E. Herman, a director of Janus Capital Corporation, is
Chairman of the Finance Committee (1990 to present) of Ewing Marion Kauffman
Foundation, 4900 Oak, Kansas City, Missouri 64112. Mr. Michael N. Stolper, a
director of Janus Capital Corporation, is President of Stolper & Company, Inc.,
600 West Broadway, Suite 1010, San Diego, California 92101, an investment
performance consultant. Mr. Thomas A. McDonnell, a director of Janus Capital
Corporation, is President, Chief Executive Officer and a Director of DST
Systems, Inc., 333 West 11th Street, 5th Floor, Kansas City, Missouri 64105,
provider of data processing and recordkeeping services for various mutual funds,
and is Executive Vice President and a director of Kansas City Southern
Industries, Inc., 114 W. 11th Street, Kansas City, Missouri 64105, a publicly
traded holding company whose primary subsidiaries are engaged in transportation,
information processing and financial services. Mr. Landon H. Rowland, a director
of Janus Capital Corporation, is President and Chief Executive Officer of Kansas
City Southern Industries, Inc.


ITEM 27. Principal Underwriters

                  (a)      Janus Distributors, Inc. ("Janus Distributors") 
                           serves as a principal underwriter for the Fund and 
                           Janus Aspen Series.

                  (b)      The principal business address, positions with Janus
                           Distributors and positions with Registrant of Thomas
                           E. Early, Kelley Abbott Howes, and Steven R. 
                           Goodbarn, officers and directors of Janus 
                           Distributors, are described under "Officers and
                           Trustees" in the Statements of Additional

                                      C-13
<PAGE>
                           Information included in this Registration Statement. 
                           The remaining principal executive officer of Janus
                           Distributors is Jennifer A. Davis, Secretary. Ms.
                           Davis does not hold any positions with the 
                           Registrant. Ms. Davis's principal business address is
                           100 Fillmore Street, Denver, Colorado 80206-4928.

                  (c)      Not applicable.


ITEM 28. Location of Accounts and Records

     The accounts, books and other documents required to be maintained by
Section 31(a) of the Investment Company Act of 1940 and the rules promulgated
thereunder are maintained by Janus Capital Corporation and Janus Service
Corporation, both of which are located at 100 Fillmore Street, Denver, Colorado
80206-4928, and by State Street Bank and Trust Company, P.O. Box 351, Boston,
Massachusetts 02101, and United Missouri Bank, P.O. Box 419226, Kansas City,
Missouri 64141-6226.


ITEM 29. Management Services

         The  Fund  has no  management-related  service  contract  which  is not
discussed in Part A or Part B of this form.


ITEM 30. Undertakings

         Not applicable.


                                      C-14
<PAGE>




                                   SIGNATURES


Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant certifies that it meets all of
the requirements for effectiveness of this Amendment to its Registration
Statement pursuant to Rule 485(b) under the Securities Act of 1933 and the Fund
has duly caused this Amendment to its Registration Statement to be signed on its
behalf by the undersigned, thereto duly authorized, in the City of Denver, and
State of Colorado, on the 16th day of February, 1999.

                                                     JANUS INVESTMENT FUND


                                                     By:  /s/ Thomas H. Bailey
                                                     Thomas H. Bailey, President

Janus Investment Fund is organized under an Agreement and Declaration
of Trust dated February 11, 1986, a copy of which is on file with the Secretary
of State of The Commonwealth of Massachusetts. The obligations of the Registrant
hereunder are not binding upon any of the Trustees, shareholders, nominees,
officers, agents or employees of the Registrant personally, but bind only the
trust property of the Registrant, as provided in the Agreement and Declaration
of Trust of the Registrant. The execution of this Amendment to the Registration
Statement has been authorized by the Trustees of the Registrant and this
Amendment to the Registration Statement has been signed by an authorized officer
of the Registrant, acting as such, and neither such authorization by such
Trustees nor such execution by such officer shall be deemed to have been made by
any of them personally, but shall bind only the trust property of the Registrant
as provided in its Declaration of Trust.

Pursuant to the requirements of the Securities Act of 1933, this
Amendment to the Registration Statement has been signed below by the following
persons in the capacities and on the dates indicated.

Signature                       Title                             Date


/s/ Thomas H. Bailey            President                  February 16, 1999
Thomas H. Bailey                (Principal Executive
                                Officer) and Trustee

/s/ Steven R. Goodbarn          Vice President and         February 16, 1999
Steven R. Goodbarn              Chief Financial Officer
                                (Principal Financial
                                Officer)

<PAGE>
/s/ Glenn P. O'Flaherty         Treasurer and Chief        February 16, 1999
Glenn P. O'Flaherty             Accounting Officer
                                (Principal Accounting
                                Officer)

/s/ James P. Craig, III         Trustee                    February 16, 1999
James P. Craig, III

Gary O. Loo*                    Trustee                    February 16, 1999
Gary O. Loo

Dennis B. Mullen*               Trustee                    February 16, 1999
Dennis B. Mullen

James T. Rothe*                 Trustee                    February 16, 1999
James T. Rothe

William D. Stewart*             Trustee                    February 16, 1999
William D. Stewart

Martin H. Waldinger*            Trustee                    February 16, 1999
Martin H. Waldinger



/s/ Steven R. Goodbarn
*By      Steven R. Goodbarn
         Attorney-in-Fact


<PAGE>




                                INDEX OF EXHIBITS

Exhibit 10                 Consent of PricewaterhouseCoopers LLP

Exhibit 14                 Financial Data Schedules







                                                                      EXHIBIT 10

                       CONSENT OF INDEPENDENT ACCOUNTANTS



We hereby consent to the incorporation by reference in the Prospectus and 
Statement of Additional Information constituting parts of this Post-Effective
Amendment No. 87 to the registration statement on N-1A (the "Registration
Statement") of our reports dated December 1, 1998, relating to the financial
statements and financial highlights appearing in the October 31, 1998 Annual 
Reports to Shareholders of Janus Investment Fund, which are also incorporated 
by reference into the Registration Statement.  We also consent to the references
to us under the heading "Financial Highlights" in the Prospectus and under the
heading "Independent Accountants" in the Statement of Additional Information.

/s/ PricewaterhouseCoopers LLP
PricewaterhouseCoopers LLP


Denver, Colorado
February 15, 1999

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       001
<NAME>                                  JANUS FUND
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                     15024990
<INVESTMENTS-AT-VALUE>                    20635999
<RECEIVABLES>                               143277
<ASSETS-OTHER>                                3442
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                            20782718
<PAYABLE-FOR-SECURITIES>                     16166
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                    45290
<TOTAL-LIABILITIES>                          61456
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                  14546706
<SHARES-COMMON-STOCK>                       740775
<SHARES-COMMON-PRIOR>                       648151
<ACCUMULATED-NII-CURRENT>                        0
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                     579287
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                   5595269
<NET-ASSETS>                              20721262
<DIVIDEND-INCOME>                           130361
<INTEREST-INCOME>                            46886
<OTHER-INCOME>                                   0
<EXPENSES-NET>                              178072
<NET-INVESTMENT-INCOME>                       (825)
<REALIZED-GAINS-CURRENT>                    589663
<APPREC-INCREASE-CURRENT>                  2210595
<NET-CHANGE-FROM-OPS>                      2799433
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                  (149577)
<DISTRIBUTIONS-OF-GAINS>                  (3125216)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                     113579
<NUMBER-OF-SHARES-REDEEMED>                (151587)
<SHARES-REINVESTED>                         130632
<NET-CHANGE-IN-ASSETS>                     1691928
<ACCUMULATED-NII-PRIOR>                     160515
<ACCUMULATED-GAINS-PRIOR>                  3104409
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                       135223
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                             181755
<AVERAGE-NET-ASSETS>                      20777322
<PER-SHARE-NAV-BEGIN>                       29.360
<PER-SHARE-NII>                             (0.020)
<PER-SHARE-GAIN-APPREC>                      3.700
<PER-SHARE-DIVIDEND>                        (0.230)
<PER-SHARE-DISTRIBUTIONS>                   (4.840)
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                         27.970
<EXPENSE-RATIO>                              0.870
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>           
<SERIES>                           
<NUMBER>                                       004
<NAME>                       JANUS ENTERPRISE FUND
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                       455646
<INVESTMENTS-AT-VALUE>                      576940
<RECEIVABLES>                                10309
<ASSETS-OTHER>                                1815
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                              589064
<PAYABLE-FOR-SECURITIES>                     23625
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                     6440
<TOTAL-LIABILITIES>                          30065
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                    361296
<SHARES-COMMON-STOCK>                        17291
<SHARES-COMMON-PRIOR>                        17881
<ACCUMULATED-NII-CURRENT>                        0
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                      76223
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                    121480
<NET-ASSETS>                                558999
<DIVIDEND-INCOME>                             1684
<INTEREST-INCOME>                              472
<OTHER-INCOME>                                   0
<EXPENSES-NET>                                5825
<NET-INVESTMENT-INCOME>                      (3669)
<REALIZED-GAINS-CURRENT>                     79005
<APPREC-INCREASE-CURRENT>                   (12029)
<NET-CHANGE-FROM-OPS>                        63307
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                        0
<DISTRIBUTIONS-OF-GAINS>                    (34480)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                      16290
<NUMBER-OF-SHARES-REDEEMED>                 (18034)
<SHARES-REINVESTED>                           1154
<NET-CHANGE-IN-ASSETS>                        7171
<ACCUMULATED-NII-PRIOR>                          0
<ACCUMULATED-GAINS-PRIOR>                    35367
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                         3982
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                               5963
<AVERAGE-NET-ASSETS>                        551467
<PER-SHARE-NAV-BEGIN>                       30.860
<PER-SHARE-NII>                              0.000
<PER-SHARE-GAIN-APPREC>                      3.430
<PER-SHARE-DIVIDEND>                         0.000
<PER-SHARE-DISTRIBUTIONS>                   (1.960)
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                         32.330
<EXPENSE-RATIO>                              1.080
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                       6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       011
<NAME>                          JANUS MERCURY FUND
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                      1857923
<INVESTMENTS-AT-VALUE>                     2349455
<RECEIVABLES>                                37126
<ASSETS-OTHER>                                1731
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                             2388312
<PAYABLE-FOR-SECURITIES>                     14262
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                     5973
<TOTAL-LIABILITIES>                          20235
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                   1644255
<SHARES-COMMON-STOCK>                       114002
<SHARES-COMMON-PRIOR>                       105674
<ACCUMULATED-NII-CURRENT>                        0
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                     234405
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                    489417
<NET-ASSETS>                               2368077
<DIVIDEND-INCOME>                             8451
<INTEREST-INCOME>                             4544
<OTHER-INCOME>                                   0
<EXPENSES-NET>                               19858
<NET-INVESTMENT-INCOME>                      (6863)
<REALIZED-GAINS-CURRENT>                    243921
<APPREC-INCREASE-CURRENT>                   204681
<NET-CHANGE-FROM-OPS>                       441739
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                    (4295)
<DISTRIBUTIONS-OF-GAINS>                   (196658)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                      80428
<NUMBER-OF-SHARES-REDEEMED>                 (84267)
<SHARES-REINVESTED>                          12167
<NET-CHANGE-IN-ASSETS>                      397028
<ACCUMULATED-NII-PRIOR>                       5512
<ACCUMULATED-GAINS-PRIOR>                   192788
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                        14071
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                              20430
<AVERAGE-NET-ASSETS>                       2103414
<PER-SHARE-NAV-BEGIN>                       18.650
<PER-SHARE-NII>                             (0.010)
<PER-SHARE-GAIN-APPREC>                      4.070
<PER-SHARE-DIVIDEND>                        (0.040)
<PER-SHARE-DISTRIBUTIONS>                   (1.900)
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                         20.770
<EXPENSE-RATIO>                              0.970
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

 <ARTICLE>                                       6
 <LEGEND>
 This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
 qualified in its entirely by reference to such financial statements.
 </LEGEND>
 <SERIES>
 <NUMBER>                                       018
 <NAME>                          JANUS OLYMPUS FUND
 <MULTIPLIER>                                  1000
 <CURRENCY>                            U.S. DOLLARS
        
 <S>                                            <C>
 <PERIOD-TYPE>                                 YEAR
 <FISCAL-YEAR-END>                      OCT-31-1998
 <PERIOD-START>                         NOV-01-1997
 <PERIOD-END>                           OCT-31-1998
 <EXCHANGE-RATE>                              1.000
 <INVESTMENTS-AT-COST>                       683632
 <INVESTMENTS-AT-VALUE>                      951517
 <RECEIVABLES>                                16163
 <ASSETS-OTHER>                                1074
 <OTHER-ITEMS-ASSETS>                             0
 <TOTAL-ASSETS>                              968754
 <PAYABLE-FOR-SECURITIES>                     17617
 <SENIOR-LONG-TERM-DEBT>                          0
 <OTHER-ITEMS-LIABILITIES>                     3643
 <TOTAL-LIABILITIES>                          21260
 <SENIOR-EQUITY>                                  0
 <PAID-IN-CAPITAL-COMMON>                    685433
 <SHARES-COMMON-STOCK>                        43666
 <SHARES-COMMON-PRIOR>                        33441
 <ACCUMULATED-NII-CURRENT>                        0
 <OVERDISTRIBUTION-NII>                           0
 <ACCUMULATED-NET-GAINS>                      (5261)
 <OVERDISTRIBUTION-GAINS>                         0
 <ACCUM-APPREC-OR-DEPREC>                    267322
 <NET-ASSETS>                                947494
 <DIVIDEND-INCOME>                             3174
 <INTEREST-INCOME>                             2771
 <OTHER-INCOME>                                   0
 <EXPENSES-NET>                                7580
 <NET-INVESTMENT-INCOME>                      (1635)
 <REALIZED-GAINS-CURRENT>                     (4017)
 <APPREC-INCREASE-CURRENT>                   150137
 <NET-CHANGE-FROM-OPS>                       144485
 <EQUALIZATION>                                   0
 <DISTRIBUTIONS-OF-INCOME>                    (1358)
 <DISTRIBUTIONS-OF-GAINS>                    (24652)
 <DISTRIBUTIONS-OTHER>                            0
 <NUMBER-OF-SHARES-SOLD>                      32029
 <NUMBER-OF-SHARES-REDEEMED>                 (23295)
 <SHARES-REINVESTED>                           1491
 <NET-CHANGE-IN-ASSETS>                      331843
 <ACCUMULATED-NII-PRIOR>                       1267
 <ACCUMULATED-GAINS-PRIOR>                    23497
 <OVERDISTRIB-NII-PRIOR>                          0
 <OVERDIST-NET-GAINS-PRIOR>                       0
 <GROSS-ADVISORY-FEES>                         5434
 <INTEREST-EXPENSE>                               0
 <GROSS-EXPENSE>                               7828
 <AVERAGE-NET-ASSETS>                        774434
 <PER-SHARE-NAV-BEGIN>                       18.410
 <PER-SHARE-NII>                              0.000
 <PER-SHARE-GAIN-APPREC>                      4.050
 <PER-SHARE-DIVIDEND>                        (0.040)
 <PER-SHARE-DISTRIBUTIONS>                   (0.720)
 <RETURNS-OF-CAPITAL>                         0.000
 <PER-SHARE-NAV-END>                         21.700
 <EXPENSE-RATIO>                              1.010
 <AVG-DEBT-OUTSTANDING>                           0
 <AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       020
<NAME>                   JANUS SPECIAL SITUATIONS FUND
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                       747176
<INVESTMENTS-AT-VALUE>                      789582
<RECEIVABLES>                                 8387
<ASSETS-OTHER>                                 555
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                              798524
<PAYABLE-FOR-SECURITIES>                      9884
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                     2323
<TOTAL-LIABILITIES>                          12207
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                    745046
<SHARES-COMMON-STOCK>                        53972
<SHARES-COMMON-PRIOR>                        23704
<ACCUMULATED-NII-CURRENT>                        0
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                      (1103)
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                     42374
<NET-ASSETS>                                786317
<DIVIDEND-INCOME>                             3267
<INTEREST-INCOME>                              757
<OTHER-INCOME>                                   0
<EXPENSES-NET>                                7511
<NET-INVESTMENT-INCOME>                      (3487)
<REALIZED-GAINS-CURRENT>                     (2070)
<APPREC-INCREASE-CURRENT>                     9074
<NET-CHANGE-FROM-OPS>                         3517
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                        0
<DISTRIBUTIONS-OF-GAINS>                    (17012)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                      59478
<NUMBER-OF-SHARES-REDEEMED>                 (30431)
<SHARES-REINVESTED>                           1221
<NET-CHANGE-IN-ASSETS>                      452540
<ACCUMULATED-NII-PRIOR>                          0
<ACCUMULATED-GAINS-PRIOR>                    17997
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                         5040
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                               7722
<AVERAGE-NET-ASSETS>                        716123
<PER-SHARE-NAV-BEGIN>                       14.080
<PER-SHARE-NII>                              0.000
<PER-SHARE-GAIN-APPREC>                      1.150
<PER-SHARE-DIVIDEND>                         0.000
<PER-SHARE-DISTRIBUTIONS>                   (0.660)
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                         14.570
<EXPENSE-RATIO>                              1.080
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       002
<NAME>                           JANUS TWENTY FUND
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                      7545618
<INVESTMENTS-AT-VALUE>                    11123804
<RECEIVABLES>                               156636
<ASSETS-OTHER>                                1620
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                            11282060
<PAYABLE-FOR-SECURITIES>                      9429
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                    17761
<TOTAL-LIABILITIES>                          27190
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                   7560146
<SHARES-COMMON-STOCK>                       261874
<SHARES-COMMON-PRIOR>                       167001
<ACCUMULATED-NII-CURRENT>                    31035
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                      86537
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                   3577152
<NET-ASSETS>                              11254870
<DIVIDEND-INCOME>                            39870
<INTEREST-INCOME>                            63216
<OTHER-INCOME>                                   0
<EXPENSES-NET>                               72034
<NET-INVESTMENT-INCOME>                      31052
<REALIZED-GAINS-CURRENT>                     84283
<APPREC-INCREASE-CURRENT>                  2427694
<NET-CHANGE-FROM-OPS>                      2543029
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                   (16587)
<DISTRIBUTIONS-OF-GAINS>                   (752195)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                     137366
<NUMBER-OF-SHARES-REDEEMED>                 (67253)
<SHARES-REINVESTED>                          24760
<NET-CHANGE-IN-ASSETS>                     5383800
<ACCUMULATED-NII-PRIOR>                      16568
<ACCUMULATED-GAINS-PRIOR>                   754451
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                        52477
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                              73196
<AVERAGE-NET-ASSETS>                       8025121
<PER-SHARE-NAV-BEGIN>                       35.160
<PER-SHARE-NII>                              0.120
<PER-SHARE-GAIN-APPREC>                     12.260
<PER-SHARE-DIVIDEND>                        (0.100)
<PER-SHARE-DISTRIBUTIONS>                   (4.460)
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                         42.980
<EXPENSE-RATIO>                              0.910
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       005
<NAME>                        JANUS WORLDWIDE FUND
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                     11347700
<INVESTMENTS-AT-VALUE>                    13948548
<RECEIVABLES>                               201338
<ASSETS-OTHER>                                 647
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                            14150533
<PAYABLE-FOR-SECURITIES>                    113989
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                   104554
<TOTAL-LIABILITIES>                         218543
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                  11702483
<SHARES-COMMON-STOCK>                       335568
<SHARES-COMMON-PRIOR>                       258645
<ACCUMULATED-NII-CURRENT>                    61968
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                    (359700)
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                   2527239
<NET-ASSETS>                              13931990
<DIVIDEND-INCOME>                           133821
<INTEREST-INCOME>                            45943
<OTHER-INCOME>                                   0
<EXPENSES-NET>                              117830
<NET-INVESTMENT-INCOME>                      61934
<REALIZED-GAINS-CURRENT>                   (331717)
<APPREC-INCREASE-CURRENT>                  1260143
<NET-CHANGE-FROM-OPS>                       990360
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                   (50801)
<DISTRIBUTIONS-OF-GAINS>                   (676334)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                     204904
<NUMBER-OF-SHARES-REDEEMED>                (146793)
<SHARES-REINVESTED>                          18812
<NET-CHANGE-IN-ASSETS>                     3573765
<ACCUMULATED-NII-PRIOR>                      69045
<ACCUMULATED-GAINS-PRIOR>                   630141
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                        85269
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                             120512
<AVERAGE-NET-ASSETS>                      13078350
<PER-SHARE-NAV-BEGIN>                       40.050
<PER-SHARE-NII>                              1.260
<PER-SHARE-GAIN-APPREC>                      3.010
<PER-SHARE-DIVIDEND>                        (1.350)
<PER-SHARE-DISTRIBUTIONS>                   (1.450)
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                         41.520
<EXPENSE-RATIO>                              0.920
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31,1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>                                 
<NUMBER>                                       007
<NAME>                         JANUS BALANCED FUND
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       <S>                                     <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                       740915
<INVESTMENTS-AT-VALUE>                      822729
<RECEIVABLES>                                20238
<ASSETS-OTHER>                                 560
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                              843527
<PAYABLE-FOR-SECURITIES>                     12029
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                     1449
<TOTAL-LIABILITIES>                          13478
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                    737933
<SHARES-COMMON-STOCK>                        48209
<SHARES-COMMON-PRIOR>                        21530
<ACCUMULATED-NII-CURRENT>                     4165
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                       6135
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                     81816
<NET-ASSETS>                                830049
<DIVIDEND-INCOME>                             4522
<INTEREST-INCOME>                            13427
<OTHER-INCOME>                                   0
<EXPENSES-NET>                                5410
<NET-INVESTMENT-INCOME>                      12539
<REALIZED-GAINS-CURRENT>                      5846
<APPREC-INCREASE-CURRENT>                    49716
<NET-CHANGE-FROM-OPS>                        68101
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                   (10977)
<DISTRIBUTIONS-OF-GAINS>                    (34067)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                      37044
<NUMBER-OF-SHARES-REDEEMED>                 (13233)
<SHARES-REINVESTED>                           2868
<NET-CHANGE-IN-ASSETS>                      469890
<ACCUMULATED-NII-PRIOR>                       2406
<ACCUMULATED-GAINS-PRIOR>                    34553
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                         3870
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                               5512
<AVERAGE-NET-ASSETS>                        536524
<PER-SHARE-NAV-BEGIN>                       16.730
<PER-SHARE-NII>                              0.330
<PER-SHARE-GAIN-APPREC>                      2.000
<PER-SHARE-DIVIDEND>                        (0.350)
<PER-SHARE-DISTRIBUTIONS>                   (1.490)
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                         17.220
<EXPENSE-RATIO>                              1.030
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>                 
<NUMBER>                                       019
<NAME>                    JANUS EQUITY INCOME FUND
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                       177256
<INVESTMENTS-AT-VALUE>                      198519
<RECEIVABLES>                                 4776
<ASSETS-OTHER>                                 671
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                              203966
<PAYABLE-FOR-SECURITIES>                      2238
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                      946
<TOTAL-LIABILITIES>                           3184
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                    175807
<SHARES-COMMON-STOCK>                        12875
<SHARES-COMMON-PRIOR>                         5317
<ACCUMULATED-NII-CURRENT>                      474
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                       3236
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                     21265
<NET-ASSETS>                                200782
<DIVIDEND-INCOME>                             1492
<INTEREST-INCOME>                              633
<OTHER-INCOME>                                   0
<EXPENSES-NET>                                1582
<NET-INVESTMENT-INCOME>                        543
<REALIZED-GAINS-CURRENT>                      3247
<APPREC-INCREASE-CURRENT>                    13912
<NET-CHANGE-FROM-OPS>                        17702
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                     (233)
<DISTRIBUTIONS-OF-GAINS>                     (5097)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                      15102
<NUMBER-OF-SHARES-REDEEMED>                  (7952)
<SHARES-REINVESTED>                            408
<NET-CHANGE-IN-ASSETS>                      126457
<ACCUMULATED-NII-PRIOR>                         87
<ACCUMULATED-GAINS-PRIOR>                     5163
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                         1002
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                               1615
<AVERAGE-NET-ASSETS>                        133613
<PER-SHARE-NAV-BEGIN>                       13.980
<PER-SHARE-NII>                              0.050
<PER-SHARE-GAIN-APPREC>                      2.470
<PER-SHARE-DIVIDEND>                        (0.030)
<PER-SHARE-DISTRIBUTIONS>                   (0.880)
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                         15.590
<EXPENSE-RATIO>                              1.210
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       006
<NAME>                JANUS GROWTH AND INCOME FUND
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                      2331485
<INVESTMENTS-AT-VALUE>                     2825721
<RECEIVABLES>                                18100
<ASSETS-OTHER>                                1103
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                             2844924
<PAYABLE-FOR-SECURITIES>                     18678
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                     7167
<TOTAL-LIABILITIES>                          25845
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                   2102737
<SHARES-COMMON-STOCK>                       106584
<SHARES-COMMON-PRIOR>                        75342
<ACCUMULATED-NII-CURRENT>                     5513
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                     219309
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                    491520
<NET-ASSETS>                               2819079
<DIVIDEND-INCOME>                            18143
<INTEREST-INCOME>                            13361
<OTHER-INCOME>                                   0
<EXPENSES-NET>                               23209
<NET-INVESTMENT-INCOME>                       8295
<REALIZED-GAINS-CURRENT>                    220260
<APPREC-INCREASE-CURRENT>                   104949
<NET-CHANGE-FROM-OPS>                       333504
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                    (3592)
<DISTRIBUTIONS-OF-GAINS>                   (184658)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                      54594
<NUMBER-OF-SHARES-REDEEMED>                 (31457)
<SHARES-REINVESTED>                           8105
<NET-CHANGE-IN-ASSETS>                      930080
<ACCUMULATED-NII-PRIOR>                        823
<ACCUMULATED-GAINS-PRIOR>                   183694
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                        16513
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                              23782
<AVERAGE-NET-ASSETS>                       2478899
<PER-SHARE-NAV-BEGIN>                       25.070
<PER-SHARE-NII>                              0.080
<PER-SHARE-GAIN-APPREC>                      3.720
<PER-SHARE-DIVIDEND>                        (0.040)
<PER-SHARE-DISTRIBUTIONS>                   (2.380)
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                         26.450
<EXPENSE-RATIO>                              0.960
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirely by reference to such financial statements.
</LEGEND>
<SERIES>                     
<NUMBER>                                       003
<NAME>                          JANUS VENTURE FUND
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                       814361
<INVESTMENTS-AT-VALUE>                     1040256
<RECEIVABLES>                                  426
<ASSETS-OTHER>                                1752
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                             1042434
<PAYABLE-FOR-SECURITIES>                      5014
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                     1552
<TOTAL-LIABILITIES>                           6566
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                    720685
<SHARES-COMMON-STOCK>                        20797
<SHARES-COMMON-PRIOR>                        21284
<ACCUMULATED-NII-CURRENT>                        0
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                      89289
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                    225894
<NET-ASSETS>                               1035868
<DIVIDEND-INCOME>                             2827
<INTEREST-INCOME>                             4665
<OTHER-INCOME>                                   0
<EXPENSES-NET>                               10872
<NET-INVESTMENT-INCOME>                      (3380)
<REALIZED-GAINS-CURRENT>                     88939
<APPREC-INCREASE-CURRENT>                   (64755)
<NET-CHANGE-FROM-OPS>                        20804
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                    (1510)
<DISTRIBUTIONS-OF-GAINS>                   (193117)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                       3296
<NUMBER-OF-SHARES-REDEEMED>                  (7687)
<SHARES-REINVESTED>                           3904
<NET-CHANGE-IN-ASSETS>                     (216473)
<ACCUMULATED-NII-PRIOR>                       3432
<ACCUMULATED-GAINS-PRIOR>                   191545
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                         8032
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                              11045
<AVERAGE-NET-ASSETS>                       1174220
<PER-SHARE-NAV-BEGIN>                       58.840
<PER-SHARE-NII>                             (0.090)
<PER-SHARE-GAIN-APPREC>                      0.430
<PER-SHARE-DIVIDEND>                        (0.070)
<PER-SHARE-DISTRIBUTIONS>                   (9.300)
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                         49.810
<EXPENSE-RATIO>                              0.940
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31,1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       013
<NAME>                         JANUS OVERSEAS FUND
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                      3385944
<INVESTMENTS-AT-VALUE>                     3921704
<RECEIVABLES>                                63376
<ASSETS-OTHER>                                1081
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                             3986161
<PAYABLE-FOR-SECURITIES>                     43390
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                    53673
<TOTAL-LIABILITIES>                          97063
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                   3548643
<SHARES-COMMON-STOCK>                       216615
<SHARES-COMMON-PRIOR>                       178699
<ACCUMULATED-NII-CURRENT>                    19959
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                    (175453)
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                    495949
<NET-ASSETS>                               3889098
<DIVIDEND-INCOME>                            45935
<INTEREST-INCOME>                            13965
<OTHER-INCOME>                                   0
<EXPENSES-NET>                               37156
<NET-INVESTMENT-INCOME>                      22744
<REALIZED-GAINS-CURRENT>                   (174093)
<APPREC-INCREASE-CURRENT>                   200570
<NET-CHANGE-FROM-OPS>                        49221
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                   (16883)
<DISTRIBUTIONS-OF-GAINS>                    (89374)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                     220566
<NUMBER-OF-SHARES-REDEEMED>                (188605)
<SHARES-REINVESTED>                           5955
<NET-CHANGE-IN-ASSETS>                      683901
<ACCUMULATED-NII-PRIOR>                      19546
<ACCUMULATED-GAINS-PRIOR>                    82566
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                        26061
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                              37810
<AVERAGE-NET-ASSETS>                       3948710
<PER-SHARE-NAV-BEGIN>                       17.940
<PER-SHARE-NII>                              0.080
<PER-SHARE-GAIN-APPREC>                      0.540
<PER-SHARE-DIVIDEND>                        (0.100)
<PER-SHARE-DISTRIBUTIONS>                   (0.510)
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                         17.950
<EXPENSE-RATIO>                              0.960
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       008
<NAME>                       JANUS FLEXIBLE INCOME FUND
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                      1102565
<INVESTMENTS-AT-VALUE>                     1118112
<RECEIVABLES>                                24613
<ASSETS-OTHER>                                 217
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                             1142942
<PAYABLE-FOR-SECURITIES>                     34947
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                     4404
<TOTAL-LIABILITIES>                          39351
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                   1075251
<SHARES-COMMON-STOCK>                       111320
<SHARES-COMMON-PRIOR>                        72706
<ACCUMULATED-NII-CURRENT>                      708
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                      12577
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                     15055
<NET-ASSETS>                               1103591
<DIVIDEND-INCOME>                             1177
<INTEREST-INCOME>                            65763
<OTHER-INCOME>                                   0
<EXPENSES-NET>                                7315
<NET-INVESTMENT-INCOME>                      59625
<REALIZED-GAINS-CURRENT>                     13197
<APPREC-INCREASE-CURRENT>                    (8610)
<NET-CHANGE-FROM-OPS>                        64212
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                   (59616)
<DISTRIBUTIONS-OF-GAINS>                    (15666)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                      69152
<NUMBER-OF-SHARES-REDEEMED>                 (37113)
<SHARES-REINVESTED>                           6575
<NET-CHANGE-IN-ASSETS>                      376490
<ACCUMULATED-NII-PRIOR>                        610
<ACCUMULATED-GAINS-PRIOR>                    15135
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                         5211
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                               7545
<AVERAGE-NET-ASSETS>                        892853
<PER-SHARE-NAV-BEGIN>                       10.000
<PER-SHARE-NII>                              0.670
<PER-SHARE-GAIN-APPREC>                      0.120
<PER-SHARE-DIVIDEND>                        (0.670)
<PER-SHARE-DISTRIBUTIONS>                   (0.210)
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                          9.910
<EXPENSE-RATIO>                              0.840
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                       6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                      017
<NAME>                      JANUS HIGH-YIELD FUND
<MULTIPLIER>                                 1000
<CURRENCY>                           U.S. DOLLARS
       
<S>                                           <C>
<PERIOD-TYPE>                                YEAR
<FISCAL-YEAR-END>                     OCT-31-1998
<PERIOD-START>                        NOV-01-1997
<PERIOD-END>                          OCT-31-1998
<EXCHANGE-RATE>                             1.000
<INVESTMENTS-AT-COST>                      292300
<INVESTMENTS-AT-VALUE>                     270339
<RECEIVABLES>                               13946
<ASSETS-OTHER>                                365
<OTHER-ITEMS-ASSETS>                            0
<TOTAL-ASSETS>                             284650
<PAYABLE-FOR-SECURITIES>                    15067
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>                    1366
<TOTAL-LIABILITIES>                         16433
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>                   291286
<SHARES-COMMON-STOCK>                       26156
<SHARES-COMMON-PRIOR>                       25471
<ACCUMULATED-NII-CURRENT>                      (6)
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                     (1101)
<OVERDISTRIBUTION-GAINS>                        0
<ACCUM-APPREC-OR-DEPREC>                   (21962)
<NET-ASSETS>                               268217
<DIVIDEND-INCOME>                             252
<INTEREST-INCOME>                           33298
<OTHER-INCOME>                                  0
<EXPENSES-NET>                               3662
<NET-INVESTMENT-INCOME>                     29888
<REALIZED-GAINS-CURRENT>                    (1034)
<APPREC-INCREASE-CURRENT>                  (28168)
<NET-CHANGE-FROM-OPS>                         686
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>                  (29888)
<DISTRIBUTIONS-OF-GAINS>                   (16609)
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>                     43131
<NUMBER-OF-SHARES-REDEEMED>                (46003)
<SHARES-REINVESTED>                          3557
<NET-CHANGE-IN-ASSETS>                     (33205)
<ACCUMULATED-NII-PRIOR>                       142
<ACCUMULATED-GAINS-PRIOR>                   16395
<OVERDISTRIB-NII-PRIOR>                         0
<OVERDIST-NET-GAINS-PRIOR>                      0
<GROSS-ADVISORY-FEES>                        2773
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                              3783
<AVERAGE-NET-ASSETS>                       380942
<PER-SHARE-NAV-BEGIN>                      11.830
<PER-SHARE-NII>                             0.900
<PER-SHARE-GAIN-APPREC>                    (1.020)
<PER-SHARE-DIVIDEND>                       (0.900)
<PER-SHARE-DISTRIBUTIONS>                  (0.560)
<RETURNS-OF-CAPITAL>                        0.000
<PER-SHARE-NAV-END>                        10.250
<EXPENSE-RATIO>                             0.990
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                        0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       012
<NAME>                    JANUS FEDERAL TAX - EXEMPT FUND
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                             1.000
<INVESTMENTS-AT-COST>                       91775
<INVESTMENTS-AT-VALUE>                      93941
<RECEIVABLES>                                4811
<ASSETS-OTHER>                                140
<OTHER-ITEMS-ASSETS>                            0
<TOTAL-ASSETS>                              98892
<PAYABLE-FOR-SECURITIES>                     6924
<SENIOR-LONG-TERM-DEBT>                         0
<OTHER-ITEMS-LIABILITIES>                     343
<TOTAL-LIABILITIES>                          7267
<SENIOR-EQUITY>                                 0
<PAID-IN-CAPITAL-COMMON>                    89965
<SHARES-COMMON-STOCK>                       12595
<SHARES-COMMON-PRIOR>                        8755
<ACCUMULATED-NII-CURRENT>                       0
<OVERDISTRIBUTION-NII>                          0
<ACCUMULATED-NET-GAINS>                      (506)
<OVERDISTRIBUTION-GAINS>                        0
<ACCUM-APPREC-OR-DEPREC>                     2166
<NET-ASSETS>                                91625
<DIVIDEND-INCOME>                               0
<INTEREST-INCOME>                            4012
<OTHER-INCOME>                                  0
<EXPENSES-NET>                                482
<NET-INVESTMENT-INCOME>                      3530
<REALIZED-GAINS-CURRENT>                      945
<APPREC-INCREASE-CURRENT>                     701
<NET-CHANGE-FROM-OPS>                        5176
<EQUALIZATION>                                  0
<DISTRIBUTIONS-OF-INCOME>                   (3530)
<DISTRIBUTIONS-OF-GAINS>                        0
<DISTRIBUTIONS-OTHER>                           0
<NUMBER-OF-SHARES-SOLD>                      9960
<NUMBER-OF-SHARES-REDEEMED>                 (6525)
<SHARES-REINVESTED>                           405
<NET-CHANGE-IN-ASSETS>                      29570
<ACCUMULATED-NII-PRIOR>                         0
<ACCUMULATED-GAINS-PRIOR>                   (1451)
<OVERDISTRIB-NII-PRIOR>                         0
<OVERDIST-NET-GAINS-PRIOR>                      0
<GROSS-ADVISORY-FEES>                         445
<INTEREST-EXPENSE>                              0
<GROSS-EXPENSE>                               735
<AVERAGE-NET-ASSETS>                        74133
<PER-SHARE-NAV-BEGIN>                       7.090
<PER-SHARE-NII>                             0.340
<PER-SHARE-GAIN-APPREC>                     0.180
<PER-SHARE-DIVIDEND>                       (0.340)
<PER-SHARE-DISTRIBUTIONS>                   0.000
<RETURNS-OF-CAPITAL>                        0.000
<PER-SHARE-NAV-END>                         7.270
<EXPENSE-RATIO>                             0.670
<AVG-DEBT-OUTSTANDING>                          0
<AVG-DEBT-PER-SHARE>                        0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       010
<NAME>                      JANUS SHORT TERM BOND FUND
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                       138098
<INVESTMENTS-AT-VALUE>                      138931
<RECEIVABLES>                                 3174
<ASSETS-OTHER>                                  41
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                              142146
<PAYABLE-FOR-SECURITIES>                         0
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                     1240
<TOTAL-LIABILITIES>                           1240
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                    142939
<SHARES-COMMON-STOCK>                        48497
<SHARES-COMMON-PRIOR>                        19980
<ACCUMULATED-NII-CURRENT>                        1
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                      (2428)
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                       394
<NET-ASSETS>                                140906
<DIVIDEND-INCOME>                                0
<INTEREST-INCOME>                             5879
<OTHER-INCOME>                                   0
<EXPENSES-NET>                                 582
<NET-INVESTMENT-INCOME>                       5297
<REALIZED-GAINS-CURRENT>                       401
<APPREC-INCREASE-CURRENT>                      (14)
<NET-CHANGE-FROM-OPS>                         5684
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                    (5297)
<DISTRIBUTIONS-OF-GAINS>                         0
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                      60319
<NUMBER-OF-SHARES-REDEEMED>                 (33460)
<SHARES-REINVESTED>                           1658
<NET-CHANGE-IN-ASSETS>                       82998
<ACCUMULATED-NII-PRIOR>                          1
<ACCUMULATED-GAINS-PRIOR>                    (2829)
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                          582
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                                950
<AVERAGE-NET-ASSETS>                         89556
<PER-SHARE-NAV-BEGIN>                        2.900
<PER-SHARE-NII>                              0.170
<PER-SHARE-GAIN-APPREC>                      0.010
<PER-SHARE-DIVIDEND>                        (0.170)
<PER-SHARE-DISTRIBUTIONS>                    0.000
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                          2.910
<EXPENSE-RATIO>                              0.670
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       141
<NAME>               JANUS MONEY MARKET FUND - INVESTOR SHARES
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                      6672769
<INVESTMENTS-AT-VALUE>                           0
<RECEIVABLES>                                40546
<ASSETS-OTHER>                                 173
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                             6713488
<PAYABLE-FOR-SECURITIES>                    177403
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                    27633
<TOTAL-LIABILITIES>                         205036
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                   6508452
<SHARES-COMMON-STOCK>                      1492023
<SHARES-COMMON-PRIOR>                      1032647
<ACCUMULATED-NII-CURRENT>                        0
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                          0
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                         0
<NET-ASSETS>                               1492023
<DIVIDEND-INCOME>                                0
<INTEREST-INCOME>                           273633
<OTHER-INCOME>                                   0
<EXPENSES-NET>                               12377
<NET-INVESTMENT-INCOME>                     261256
<REALIZED-GAINS-CURRENT>                       161
<APPREC-INCREASE-CURRENT>                        0
<NET-CHANGE-FROM-OPS>                       261417
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                   (57683)
<DISTRIBUTIONS-OF-GAINS>                       (42)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                    5447777
<NUMBER-OF-SHARES-REDEEMED>               (5042859)
<SHARES-REINVESTED>                          54458
<NET-CHANGE-IN-ASSETS>                      459376
<ACCUMULATED-NII-PRIOR>                          0
<ACCUMULATED-GAINS-PRIOR>                        0
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                         1124
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                               6828
<AVERAGE-NET-ASSETS>                       1123991
<PER-SHARE-NAV-BEGIN>                        1.000
<PER-SHARE-NII>                              0.050
<PER-SHARE-GAIN-APPREC>                      0.000
<PER-SHARE-DIVIDEND>                        (0.050)
<PER-SHARE-DISTRIBUTIONS>                    0.000
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                          1.000
<EXPENSE-RATIO>                              0.600
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998  included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       142
<NAME>            JANUS MONEY MARKET FUND - INSTITUTIONAL SHARES
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                      6672769
<INVESTMENTS-AT-VALUE>                           0
<RECEIVABLES>                                40546
<ASSETS-OTHER>                                 173
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                             6713488
<PAYABLE-FOR-SECURITIES>                    177403
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                    27633
<TOTAL-LIABILITIES>                         205036
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                   6508452
<SHARES-COMMON-STOCK>                      4973909
<SHARES-COMMON-PRIOR>                      2770961
<ACCUMULATED-NII-CURRENT>                        0
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                          0
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                         0
<NET-ASSETS>                               4973909
<DIVIDEND-INCOME>                                0
<INTEREST-INCOME>                           273633
<OTHER-INCOME>                                   0
<EXPENSES-NET>                               12377
<NET-INVESTMENT-INCOME>                     261256
<REALIZED-GAINS-CURRENT>                       161
<APPREC-INCREASE-CURRENT>                        0
<NET-CHANGE-FROM-OPS>                       261417
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                  (202020)
<DISTRIBUTIONS-OF-GAINS>                      (118)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                   89394668
<NUMBER-OF-SHARES-REDEEMED>              (87252582)
<SHARES-REINVESTED>                          60862
<NET-CHANGE-IN-ASSETS>                     2202948
<ACCUMULATED-NII-PRIOR>                          0
<ACCUMULATED-GAINS-PRIOR>                        0
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                         3621
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                               5515
<AVERAGE-NET-ASSETS>                       3620872
<PER-SHARE-NAV-BEGIN>                        1.000
<PER-SHARE-NII>                             (0.060)
<PER-SHARE-GAIN-APPREC>                      0.000
<PER-SHARE-DIVIDEND>                         0.060
<PER-SHARE-DISTRIBUTIONS>                    0.000
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                          1.000
<EXPENSE-RATIO>                              0.150
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       143
<NAME>                    JANUS MONEY MARKET FUND - SERVICE SHARES
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                      6672769
<INVESTMENTS-AT-VALUE>                           0
<RECEIVABLES>                                40546
<ASSETS-OTHER>                                 173
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                             6713488
<PAYABLE-FOR-SECURITIES>                    177403
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                    27633
<TOTAL-LIABILITIES>                         205036
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                   6508452
<SHARES-COMMON-STOCK>                        42520
<SHARES-COMMON-PRIOR>                        10341
<ACCUMULATED-NII-CURRENT>                        0
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                          0
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                         0
<NET-ASSETS>                                 42520
<DIVIDEND-INCOME>                                0
<INTEREST-INCOME>                           273633
<OTHER-INCOME>                                   0
<EXPENSES-NET>                               12377
<NET-INVESTMENT-INCOME>                     261256
<REALIZED-GAINS-CURRENT>                       161
<APPREC-INCREASE-CURRENT>                        0
<NET-CHANGE-FROM-OPS>                       261417
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                    (1553)
<DISTRIBUTIONS-OF-GAINS>                        (1)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                     323786
<NUMBER-OF-SHARES-REDEEMED>                (293167)
<SHARES-REINVESTED>                           1560
<NET-CHANGE-IN-ASSETS>                       32179
<ACCUMULATED-NII-PRIOR>                          0
<ACCUMULATED-GAINS-PRIOR>                        0
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                           29
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                                202
<AVERAGE-NET-ASSETS>                         29322
<PER-SHARE-NAV-BEGIN>                        1.000
<PER-SHARE-NII>                              0.050
<PER-SHARE-GAIN-APPREC>                      0.000
<PER-SHARE-DIVIDEND>                        (0.050)
<PER-SHARE-DISTRIBUTIONS>                    0.000
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                          1.000
<EXPENSE-RATIO>                              0.400
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31,1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       151
<NAME>             JANUS GOVT MONEY MARKET FUND - INVESTOR SHARES
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                      1038994
<INVESTMENTS-AT-VALUE>                     1038994
<RECEIVABLES>                                 1634
<ASSETS-OTHER>                                  93
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                             1040721
<PAYABLE-FOR-SECURITIES>                         0
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                     4042
<TOTAL-LIABILITIES>                           4042
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                   1036679
<SHARES-COMMON-STOCK>                       213239
<SHARES-COMMON-PRIOR>                       132134
<ACCUMULATED-NII-CURRENT>                        0
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                          0
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                         0
<NET-ASSETS>                                213239
<DIVIDEND-INCOME>                                0
<INTEREST-INCOME>                            26376
<OTHER-INCOME>                                   0
<EXPENSES-NET>                                1400
<NET-INVESTMENT-INCOME>                      24976
<REALIZED-GAINS-CURRENT>                        10
<APPREC-INCREASE-CURRENT>                        0
<NET-CHANGE-FROM-OPS>                        24986
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                    (7537)
<DISTRIBUTIONS-OF-GAINS>                        (5)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                     384359
<NUMBER-OF-SHARES-REDEEMED>                (310430)
<SHARES-REINVESTED>                           7176
<NET-CHANGE-IN-ASSETS>                       81105
<ACCUMULATED-NII-PRIOR>                          0
<ACCUMULATED-GAINS-PRIOR>                        0
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                          151
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                                915
<AVERAGE-NET-ASSETS>                        150525
<PER-SHARE-NAV-BEGIN>                        1.000
<PER-SHARE-NII>                              0.050
<PER-SHARE-GAIN-APPREC>                      0.000
<PER-SHARE-DIVIDEND>                        (0.050)
<PER-SHARE-DISTRIBUTIONS>                    0.000
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                          1.000
<EXPENSE-RATIO>                              0.600
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31,1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       152
<NAME>                JANUS GOVT MONEY MARKET FUND - INSTITUTIONAL SHARES
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                      1038994
<INVESTMENTS-AT-VALUE>                     1038994
<RECEIVABLES>                                 1634
<ASSETS-OTHER>                                  93
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                             1040721
<PAYABLE-FOR-SECURITIES>                         0
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                     4042
<TOTAL-LIABILITIES>                           4042
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                   1036679
<SHARES-COMMON-STOCK>                       820670
<SHARES-COMMON-PRIOR>                        35775
<ACCUMULATED-NII-CURRENT>                        0
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                          0
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                         0
<NET-ASSETS>                                820670
<DIVIDEND-INCOME>                                0
<INTEREST-INCOME>                            26376
<OTHER-INCOME>                                   0
<EXPENSES-NET>                                1400
<NET-INVESTMENT-INCOME>                      24976
<REALIZED-GAINS-CURRENT>                        10
<APPREC-INCREASE-CURRENT>                        0
<NET-CHANGE-FROM-OPS>                        24986
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                   (17406)
<DISTRIBUTIONS-OF-GAINS>                        (5)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                    2152976
<NUMBER-OF-SHARES-REDEEMED>               (1371965)
<SHARES-REINVESTED>                           3884
<NET-CHANGE-IN-ASSETS>                      784895
<ACCUMULATED-NII-PRIOR>                          0
<ACCUMULATED-GAINS-PRIOR>                        0
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                          321
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                                493
<AVERAGE-NET-ASSETS>                        321174
<PER-SHARE-NAV-BEGIN>                        1.000
<PER-SHARE-NII>                              0.050
<PER-SHARE-GAIN-APPREC>                      0.000
<PER-SHARE-DIVIDEND>                        (0.050)
<PER-SHARE-DISTRIBUTIONS>                    0.000
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                          1.000
<EXPENSE-RATIO>                              0.150
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31,1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       153
<NAME>                JANUS GOVT MONEY MARKET FUND - SERVICE SHARES
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                      1038994
<INVESTMENTS-AT-VALUE>                     1038994
<RECEIVABLES>                                 1634
<ASSETS-OTHER>                                  93
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                             1040721
<PAYABLE-FOR-SECURITIES>                         0
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                     4042
<TOTAL-LIABILITIES>                           4042
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                   1036679
<SHARES-COMMON-STOCK>                         2770
<SHARES-COMMON-PRIOR>                          628
<ACCUMULATED-NII-CURRENT>                        0
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                          0
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                         0
<NET-ASSETS>                                  2770
<DIVIDEND-INCOME>                                0
<INTEREST-INCOME>                            26376
<OTHER-INCOME>                                   0
<EXPENSES-NET>                                1400
<NET-INVESTMENT-INCOME>                      24976
<REALIZED-GAINS-CURRENT>                        10
<APPREC-INCREASE-CURRENT>                        0
<NET-CHANGE-FROM-OPS>                        24986
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                      (33)
<DISTRIBUTIONS-OF-GAINS>                         0
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                       2772
<NUMBER-OF-SHARES-REDEEMED>                   (658)
<SHARES-REINVESTED>                             28
<NET-CHANGE-IN-ASSETS>                        2142
<ACCUMULATED-NII-PRIOR>                          0
<ACCUMULATED-GAINS-PRIOR>                        0
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                            1
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                                 14
<AVERAGE-NET-ASSETS>                           639
<PER-SHARE-NAV-BEGIN>                        1.000
<PER-SHARE-NII>                              0.050
<PER-SHARE-GAIN-APPREC>                      0.000
<PER-SHARE-DIVIDEND>                        (0.050)
<PER-SHARE-DISTRIBUTIONS>                    0.000
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                          1.000
<EXPENSE-RATIO>                              0.400
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       161
<NAME>             JANUS TAX EXEMPT MONEY MARKET FUND - INVESTOR SHARES
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                       165882
<INVESTMENTS-AT-VALUE>                      165882
<RECEIVABLES>                                 8451
<ASSETS-OTHER>                                   0
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                              174333
<PAYABLE-FOR-SECURITIES>                      9701
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                      606
<TOTAL-LIABILITIES>                          10307
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                    164026
<SHARES-COMMON-STOCK>                       105011
<SHARES-COMMON-PRIOR>                        81269
<ACCUMULATED-NII-CURRENT>                        0
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                          0
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                         0
<NET-ASSETS>                                105011
<DIVIDEND-INCOME>                                0
<INTEREST-INCOME>                             4261
<OTHER-INCOME>                                   0
<EXPENSES-NET>                                 597
<NET-INVESTMENT-INCOME>                       3664
<REALIZED-GAINS-CURRENT>                        26
<APPREC-INCREASE-CURRENT>                        0
<NET-CHANGE-FROM-OPS>                         3690
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                    (2879)
<DISTRIBUTIONS-OF-GAINS>                       (21)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                     330543
<NUMBER-OF-SHARES-REDEEMED>                (309566)
<SHARES-REINVESTED>                           2765
<NET-CHANGE-IN-ASSETS>                       23742
<ACCUMULATED-NII-PRIOR>                          0
<ACCUMULATED-GAINS-PRIOR>                        0
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                           91
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                                555
<AVERAGE-NET-ASSETS>                         91058
<PER-SHARE-NAV-BEGIN>                        1.000
<PER-SHARE-NII>                              0.030
<PER-SHARE-GAIN-APPREC>                      0.000
<PER-SHARE-DIVIDEND>                        (0.030)
<PER-SHARE-DISTRIBUTIONS>                    0.000
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                          1.000
<EXPENSE-RATIO>                              0.600
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       162
<NAME>            JANUS TAX EXEMPT MONEY MARKET FUND - INSTITUTIONAL SHARES
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                       165882
<INVESTMENTS-AT-VALUE>                      165882
<RECEIVABLES>                                 8451
<ASSETS-OTHER>                                   0
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                              174333
<PAYABLE-FOR-SECURITIES>                      9701
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                      606
<TOTAL-LIABILITIES>                          10307
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                    164026
<SHARES-COMMON-STOCK>                        41319
<SHARES-COMMON-PRIOR>                         3559
<ACCUMULATED-NII-CURRENT>                        0
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                          0
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                         0
<NET-ASSETS>                                 41319
<DIVIDEND-INCOME>                                0
<INTEREST-INCOME>                             4261
<OTHER-INCOME>                                   0
<EXPENSES-NET>                                 597
<NET-INVESTMENT-INCOME>                       3664
<REALIZED-GAINS-CURRENT>                        26
<APPREC-INCREASE-CURRENT>                        0
<NET-CHANGE-FROM-OPS>                         3690
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                     (678)
<DISTRIBUTIONS-OF-GAINS>                        (3)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                     211444
<NUMBER-OF-SHARES-REDEEMED>                (174273)
<SHARES-REINVESTED>                            589
<NET-CHANGE-IN-ASSETS>                       37760
<ACCUMULATED-NII-PRIOR>                          0
<ACCUMULATED-GAINS-PRIOR>                        0
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                           19
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                                 38
<AVERAGE-NET-ASSETS>                         18859
<PER-SHARE-NAV-BEGIN>                        1.000
<PER-SHARE-NII>                             (0.040)
<PER-SHARE-GAIN-APPREC>                      0.000
<PER-SHARE-DIVIDEND>                         0.040
<PER-SHARE-DISTRIBUTIONS>                    0.000
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                          1.000
<EXPENSE-RATIO>                              0.150
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE>                                        6
<LEGEND>
This schedule contains summary financial information extracted from financial
statements dated October 31, 1998 included in the Fund's Annual Report and is
qualified in its entirety by reference to such financial statements.
</LEGEND>
<SERIES>
<NUMBER>                                       163
<NAME>                JANUS TAX EXEMPT MONEY MARKET FUND - SERVICE SHARES
<MULTIPLIER>                                  1000
<CURRENCY>                            U.S. DOLLARS
       
<S>                                            <C>
<PERIOD-TYPE>                                 YEAR
<FISCAL-YEAR-END>                      OCT-31-1998
<PERIOD-START>                         NOV-01-1997
<PERIOD-END>                           OCT-31-1998
<EXCHANGE-RATE>                              1.000
<INVESTMENTS-AT-COST>                       165882
<INVESTMENTS-AT-VALUE>                      165882
<RECEIVABLES>                                 8451
<ASSETS-OTHER>                                   0
<OTHER-ITEMS-ASSETS>                             0
<TOTAL-ASSETS>                              174333
<PAYABLE-FOR-SECURITIES>                      9701
<SENIOR-LONG-TERM-DEBT>                          0
<OTHER-ITEMS-LIABILITIES>                      606
<TOTAL-LIABILITIES>                          10307
<SENIOR-EQUITY>                                  0
<PAID-IN-CAPITAL-COMMON>                    164026
<SHARES-COMMON-STOCK>                        17696
<SHARES-COMMON-PRIOR>                           10
<ACCUMULATED-NII-CURRENT>                        0
<OVERDISTRIBUTION-NII>                           0
<ACCUMULATED-NET-GAINS>                          0
<OVERDISTRIBUTION-GAINS>                         0
<ACCUM-APPREC-OR-DEPREC>                         0
<NET-ASSETS>                                 17696
<DIVIDEND-INCOME>                                0
<INTEREST-INCOME>                             4261
<OTHER-INCOME>                                   0
<EXPENSES-NET>                                 597
<NET-INVESTMENT-INCOME>                       3664
<REALIZED-GAINS-CURRENT>                        26
<APPREC-INCREASE-CURRENT>                        0
<NET-CHANGE-FROM-OPS>                         3690
<EQUALIZATION>                                   0
<DISTRIBUTIONS-OF-INCOME>                     (107)
<DISTRIBUTIONS-OF-GAINS>                        (2)
<DISTRIBUTIONS-OTHER>                            0
<NUMBER-OF-SHARES-SOLD>                      38120
<NUMBER-OF-SHARES-REDEEMED>                 (20544)
<SHARES-REINVESTED>                            110
<NET-CHANGE-IN-ASSETS>                       17686
<ACCUMULATED-NII-PRIOR>                          0
<ACCUMULATED-GAINS-PRIOR>                        0
<OVERDISTRIB-NII-PRIOR>                          0
<OVERDIST-NET-GAINS-PRIOR>                       0
<GROSS-ADVISORY-FEES>                            3
<INTEREST-EXPENSE>                               0
<GROSS-EXPENSE>                                 22
<AVERAGE-NET-ASSETS>                          3215
<PER-SHARE-NAV-BEGIN>                        1.000
<PER-SHARE-NII>                              0.030
<PER-SHARE-GAIN-APPREC>                      0.000
<PER-SHARE-DIVIDEND>                        (0.030)
<PER-SHARE-DISTRIBUTIONS>                    0.000
<RETURNS-OF-CAPITAL>                         0.000
<PER-SHARE-NAV-END>                          1.000
<EXPENSE-RATIO>                              0.400
<AVG-DEBT-OUTSTANDING>                           0
<AVG-DEBT-PER-SHARE>                         0.000
        

</TABLE>


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