RYDEX SERIES TRUST
497, 1998-10-07
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<PAGE>

A FAMILY OF MUTUAL FUNDS DESIGNED EXCLUSIVELY FOR PROFESSIONAL MONEY MANAGERS

NOVA FUND
URSA FUND
JUNO FUND
OTC FUND
ARKTOS FUND
PRECIOUS METALS FUND
U.S. GOVERNMENT BOND FUND
U.S. GOVERNMENT MONEY MARKET FUND

RYDEX SERIES TRUST
6116 EXECUTIVE BLVD., SUITE 400
ROCKVILLE, MD 20852
301/468-8520 - 800/820-0888

[RYDEX INVESTMENT FLEXIBILITY LOGO]

RYDEX SERIES TRUST
PROSPECTUS
AUGUST 1, 1998

INVESTOR CLASS SHARES

[BULL AND BEAR LOGO]

NOVA FUND
URSA FUND
JUNO FUND
OTC FUND
ARKTOS FUND
PRECIOUS METALS FUND
U.S. GOVERNMENT BOND FUND
U.S. GOVERNMENT MONEY MARKET FUND

<PAGE>
                          PROSPECTUS -- INVESTOR CLASS
 
<TABLE>
<C>        <S>
        1  INTRODUCTION
      ---
 
        2  NOVA FUND
      ---
 
        4  URSA FUND
      ---
 
        6  OTC FUND
      ---
 
        8  ARKTOS FUND
      ---
 
       10  PRECIOUS METALS FUND
      ---
 
       12  U.S. GOVERNMENT BOND FUND
      ---
 
       14  JUNO FUND
      ---
 
       16  U.S. GOVERNMENT MONEY MARKET FUND
      ---
 
       18  MORE INFORMATION ABOUT RISK
      ---
 
       21  SHAREHOLDER INFORMATION
      ---
 
       26  MANAGEMENT
      ---
 
       28  DIVIDENDS, DISTRIBUTIONS AND TAXES
      ---
 
       30  FINANCIAL HIGHLIGHTS
      ---
 
       37  BENCHMARK INFORMATION
      ---
 
       BC  ADDITIONAL INFORMATION
      ---
</TABLE>
 
AUGUST 1, 1998, AS REVISED
 
                               RYDEX SERIES TRUST
 
                                   NOVA FUND
                                   URSA FUND
                                    OTC FUND
                                  ARKTOS FUND
                              PRECIOUS METALS FUND
                           U.S. GOVERNMENT BOND FUND
                                   JUNO FUND
                       U.S. GOVERNMENT MONEY MARKET FUND
 
         6116 Executive Boulevard, Suite 400, Rockville, Maryland 20852
                          1-800-820-0888  301-468-8520
 
Rydex Series Trust (the "Trust") is a no-load mutual fund complex with
twenty-two separate investment portfolios (the "Rydex Funds"), eight of which
are described in this Prospectus (the "Funds"). Investor Class Shares of the
Funds are sold principally to professional money managers and to investors who
take part in certain strategic and tactical asset-allocation investment
programs.
 
THE SECURITIES AND EXCHANGE COMMISSION HAS NOT APPROVED OR DISAPPROVED THE
TRUST'S SHARES OR PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
<PAGE>
 
     ICON LEGEND
 
      [ICON]
 
      Fund Objective
      The fund's particular investment goal.
 
      [ICON]
 
      Portfolio Investments
      The primary types of securities in which the fund invests.
 
      [ICON]
 
      Risk Considerations
      The major risk factors associated with the fund.
 
      [ICON]
 
      Fund Performance and Fee Information
      The overall costs incurred by an investor in the fund.
 
      [ICON]
 
      Financial Highlights
      A table showing the fund's financial performance.
 
                                       ii
<PAGE>
                                                            PROSPECTUS  1
                                                                        --------
 
INTRODUCTION
 
    The Funds' objectives (except the U.S. Government Money Market Fund) are to
match, exceed or perform the opposite of the performance of a specific index or
market indicator. The benchmark used by each Fund is set forth below:
 
<TABLE>
<CAPTION>
        FUND (TICKER SYMBOL)                                       BENCHMARK
<S>                                   <C>
 NOVA FUND (RYNVX)                    150% OF THE PERFORMANCE OF THE S&P 500 COMPOSITE STOCK PRICE
                                      INDEX-TM- (SPX)
 URSA FUND (RYURX)                    INVERSE (OPPOSITE) OF THE PERFORMANCE OF S&P 500 COMPOSITE STOCK
                                      PRICE INDEX-TM- (SPX)
 OTC FUND (RYOCX)                     100% OF THE PERFORMANCE OF THE NASDAQ 100 INDEX-TM- (NDX)
 ARKTOS FUND                          INVERSE (OPPOSITE) OF THE PERFORMANCE OF NASDAQ 100 INDEX-TM- (NDX)
 PRECIOUS METALS FUND (RYPMX)         100% OF THE PERFORMANCE OF THE PHILADELPHIA STOCK EXCHANGE
                                      GOLD/SILVER INDEX-TM- (XAU)
 U.S. GOVERNMENT BOND FUND (RYGBX)    120% OF THE PRICE MOVEMENT OF THE LONG TREASURY BOND
 JUNO FUND (RYJUX)                    INVERSE (OPPOSITE) OF THE PRICE MOVEMENT OF THE LONG
                                      TREASURY BOND
</TABLE>
 
A BRIEF GUIDE TO THE BENCHMARKS.
 
THE S&P 500 COMPOSITE STOCK PRICE INDEX-TM- (S&P 500 INDEX). The S&P 500 Index
is a capitalization-weighted index composed of 500 common stocks, which are
chosen by the Standard & Poor's Corporation ("S&P"), on a statistical basis to
be included in the S&P 500 Index.
 
THE NASDAQ 100 INDEX-TM-. The NASDAQ 100 Index-TM- is a capitalization-weighted
index composed of 100 of the largest non-financial companies listed on the
National Association of Securities Dealers Automated Quotations System.
 
THE PHILADELPHIA STOCK EXCHANGE GOLD/SILVER INDEX-TM- (XAU INDEX). The XAU Index
is a capitalization-weighted index featuring securities of ten widely-held
companies in the gold and silver mining and production industry, or companies
that invest in such mining and production companies.
 
THE LONG TREASURY BOND. The Long Treasury Bond is the current U.S. Treasury bond
with the longest maturity. Currently, the longest maturity of a U.S. Treasury
bond is 30 years.
 
    THE FUNDS:
 
    - are not federally insured
 
    - are not guaranteed by any government agency
 
    - are not bank deposits
 
    - are not guaranteed to achieve their objectives
 
INVESTING IN ANY OF THE FUNDS INVOLVES RISKS THAT MAY ADVERSELY AFFECT THE
FUNDS' NET ASSET VALUE, YIELD AND TOTAL RETURN. YOU MAY LOSE MONEY. Each Fund
(except the U.S. Government Money Market Fund) is non-diversified. Non-
diversified funds may invest in the securities of a relatively few number of
issuers. If the assets of a Fund are invested in a limited number of issuers,
the Fund may be more susceptible to a single adverse economic or regulatory
occurrence.
<PAGE>
- ------
2  PROSPECTUS
 
                         FUND INFORMATION -- NOVA FUND
 
FUND OBJECTIVE
 
[LOGO]
          The Nova Fund seeks to provide investment returns that are 150% of the
S&P 500 Index.
 
PORTFOLIO INVESTMENTS
 
[LOGO]
          Unlike a traditional index fund, as its primary investment strategy,
          the Fund invests to a significant extent in futures contracts and
options on: securities, futures contracts, and stock indexes. On a day-to-day
basis, the Fund holds U.S. Government securities to collateralize these futures
and options contracts. Futures and options contracts, if used properly, may
enable the Fund to meet its objective without investing directly in the
securities included in the index. The Fund also may purchase equity securities
and enter into repurchase agreements.
 
RISK CONSIDERATIONS
 
[LOGO]
         The Nova Fund is subject to a number of risks that will affect the
         value of its shares, including:
 
    - EQUITY RISK -- The equity markets are volatile, and the value of the
      Fund's futures and options contracts and other securities may fluctuate
      drastically from day-to-day.
 
    - LEVERAGING RISK -- The Fund invests a percentage of its assets in
      leveraged instruments, such as certain futures and options contracts. The
      more the Fund invests in these leveraged instruments, the more this
      leverage will magnify the Fund's gains or losses on those investments.
 
    - TRACKING ERROR RISK -- The Advisor may not be able to match the
      performance of the Fund's benchmark.
 
    If the Fund meets its objective, the value of the Fund's shares will tend to
increase by 150% of the value of any increase in the S&P 500 Index. However,
when the value of the S&P 500 Index declines, the value of the Fund's shares
should also decrease by 150% of the value of any decrease in the Index.
<PAGE>
                                                            PROSPECTUS  3
                                                                        --------
 
FUND PERFORMANCE AND FEE INFORMATION
 
NOVA FUND PERFORMANCE
 
[LOGO]
         The bar chart and table below show the performance of the Nova Fund
         both year-by-year and as an average over different periods of time. The
         variability of performance over time provides an indication of the
         risks of investing in the Fund. Of course, this past performance does
         not necessarily indicate how the Fund will perform in the future.
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
             NOVA FUND
<S>        <C>
1997              42.34%
1996              27.29%
1995              50.42%
1994              -4.77%
</TABLE>
 
* THE YEAR-TO-DATE RETURN FOR THE PERIOD FROM JANUARY 1, 1998 THROUGH JUNE 30,
  1998 IS 23.43%.
DURING THE PERIOD SHOWN IN THE BAR CHART, THE HIGHEST RETURN FOR A QUARTER WAS
25.15% (QUARTER ENDED JUNE 30, 1997) AND THE LOWEST RETURN FOR A QUARTER WAS
- -8.31% (QUARTER ENDED MARCH 31, 1994).
 
<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURN (FOR PERIODS ENDING DECEMBER 31, 1997)(1)
                                                                       INVESTOR CLASS
                                                                           SHARES         S&P 500 INDEX(2)
                                                                     --------------------------------------
<S>                                                                  <C>                  <C>
  Past One Year                                                                  42.34%           31.01%
  Since Inception (07/12/93)                                                     25.64%           18.80%
</TABLE>
 
(1) THESE FIGURES ASSUME THE REINVESTMENT OF DIVIDENDS AND CAPITAL GAINS
    DISTRIBUTIONS.
(2) THE S&P 500 INDEX IS AN UNMANAGED INDEX THAT IS A WIDELY RECOGNIZED
    INDICATOR OF GENERAL STOCK MARKET PERFORMANCE.
 
FEES AND EXPENSES OF THE FUND
    This table describes the fees and expenses that you may pay if you buy and
hold Investor Class Shares of the Nova Fund.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                               <C>
SHAREHOLDER FEES
  Redemption Fees*                                                                                     None
ANNUAL FUND OPERATING EXPENSES (EXPENSES THAT ARE DEDUCTED FROM NET ASSETS)
  Management Fees                                                                                      .75%
  Distribution (12b-1) Fees                                                                            None
  Other Expenses                                                                                       .36%
                                                                                                  ---------
  Total Annual Fund Operating Expenses                                                                1.11%
</TABLE>
 
* THE FUND MAY IMPOSE A WIRE TRANSFER CHARGE OF $15 ON CERTAIN REDEMPTIONS UNDER
  $5,000.
 
EXAMPLE
- --------------------------------------------------------------------------------
    This Example is intended to help you compare the cost of investing in the
Nova Fund with the cost of investing in other mutual funds.
    The Example assumes that you invest $10,000 in the Fund for the time period
indicated and 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 cost would be:
 
<TABLE>
<CAPTION>
   1 YEAR     3 YEARS    5 YEARS     10 YEARS
  --------------------------------------------
  <S>         <C>        <C>        <C>
    $113        $353       $612       $1,352
</TABLE>
<PAGE>
- ------
4  PROSPECTUS
 
                         FUND INFORMATION -- URSA FUND
 
FUND OBJECTIVE
 
[LOGO]
          The Ursa Fund seeks to provide investment results that will inversely
correlate to the performance of the S&P 500 Index.
 
PORTFOLIO INVESTMENTS
 
[LOGO]
          Unlike a traditional index fund, the Fund's benchmark is to perform
exactly opposite the S&P 500 Index, and the Fund will not own the securities
included in the Index. Instead, as its primary investment strategy, the Fund
invests to a significant extent in futures contracts and options on: securities,
futures contracts, and stock indexes. On a day-to-day basis, the Fund holds U.S.
Government securities to collateralize these futures and options contracts. The
Fund also may enter into repurchase agreements and sell securities short.
 
RISK CONSIDERATIONS
 
[LOGO]
         The Ursa Fund is subject to a number of risks that will affect the
         value of its shares, including:
 
    - EQUITY RISK -- The equity markets are volatile, and the value of the
      Fund's futures and options contracts and other securities may fluctuate
      drastically from day-to-day.
 
    - TRACKING ERROR RISK -- The Advisor may not be able to match the
      performance of the Fund's benchmark.
 
    If the Fund meets its objective, the value of the Fund's shares will tend to
increase during times when the value of the S&P 500 Index is decreasing. When
the value of the S&P 500 Index is increasing, however, the value of the Fund's
shares should decrease by an inversely proportionate amount (e.g., if the S&P
500 Index goes up by 10%, the value of the Fund's shares should go down by 10%).
<PAGE>
                                                            PROSPECTUS  5
                                                                        --------
 
FUND PERFORMANCE AND FEE INFORMATION
 
URSA FUND PERFORMANCE
 
[LOGO]
         The bar chart and table below show the performance of the Ursa Fund
         both year-by-year and as an average over different periods of time. The
         variability of performance over time provides an indication of the
         risks of investing in the Fund. Of course, this past performance does
         not necessarily indicate how the Fund will perform in the future.
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
            URSA FUND
<S>        <C>
1997            -20.99%
1996            -12.17%
1995            -20.14%
</TABLE>
 
* THE YEAR-TO-DATE RETURN FOR THE PERIOD FROM JANUARY 1, 1998 THROUGH JUNE 30,
  1998 IS -11.91%.
DURING THE PERIOD SHOWN IN THE BAR CHART, THE HIGHEST RETURN FOR A QUARTER WAS
1.69% (QUARTER ENDED DECEMBER 31, 1994) AND THE LOWEST RETURN FOR A QUARTER WAS
- -14.1% (QUARTER ENDED JUNE 30, 1997).
 
<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURN (FOR PERIODS ENDING DECEMBER 31, 1997)(1)
                                                                       INVESTOR CLASS
                                                                           SHARES         S&P 500 INDEX(2)
                                                                     --------------------------------------
<S>                                                                  <C>                  <C>
  Past One Year                                                                 -20.99%           31.01%
  Since Inception (01/07/94)                                                    -12.98%           19.97%
</TABLE>
 
(1) THESE FIGURES ASSUME THE REINVESTMENT OF DIVIDENDS AND CAPITAL GAINS
    DISTRIBUTIONS.
(2) THE S&P 500 INDEX IS AN UNMANAGED INDEX THAT IS A WIDELY RECOGNIZED
    INDICATOR OF GENERAL STOCK MARKET PERFORMANCE.
 
FEES AND EXPENSES OF THE FUND
    This table describes the fees and expenses that you may pay if you buy and
hold Investor Class Shares of the Ursa Fund.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                               <C>
SHAREHOLDER FEES
  Redemption Fees*                                                                                     None
ANNUAL FUND OPERATING EXPENSES (EXPENSES THAT ARE DEDUCTED FROM NET ASSETS)
  Management Fees                                                                                      .90%
  Distribution (12b-1) Fees                                                                            None
  Other Expenses                                                                                       .44%
                                                                                                  ---------
  Total Annual Fund Operating Expenses                                                                1.34%
</TABLE>
 
* THE FUND MAY IMPOSE A WIRE TRANSFER CHARGE OF $15 ON CERTAIN REDEMPTIONS UNDER
  $5,000.
 
EXAMPLE
- --------------------------------------------------------------------------------
    This Example is intended to help you compare the cost of investing in the
Ursa Fund with the cost of investing in other mutual funds.
    The Example assumes that you invest $10,000 in the Fund for the time period
indicated and 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 cost would be:
 
<TABLE>
<CAPTION>
   1 YEAR     3 YEARS    5 YEARS     10 YEARS
  --------------------------------------------
  <S>         <C>        <C>        <C>
    $137        $425       $734       $1,612
</TABLE>
<PAGE>
- ------
6  PROSPECTUS
 
                          FUND INFORMATION -- OTC FUND
 
FUND OBJECTIVE
 
[LOGO]
          The OTC Fund seeks to provide investment results that correspond to a
benchmark for over-the-counter securities. The Fund's current benchmark is the
NASDAQ 100 Index-TM-.
 
PORTFOLIO INVESTMENTS
 
[LOGO]
          The Fund invests principally in securities of companies included in
the NASDAQ 100 Index-TM-. It also may invest in other instruments whose
performance is expected to correspond to that of the Index, and may engage in
futures and options transactions. The Fund may also purchase U.S.Government
securities and enter into repurchase agreements.
 
RISK CONSIDERATIONS
 
[LOGO]
         The OTC Fund is subject to a number of risks that will affect the value
         of its shares, including:
 
    - EQUITY RISK -- The equity markets are volatile, and the value of the
      Fund's securities and futures and options contracts may fluctuate
      drastically from day-to-day.
 
    - TRACKING ERROR RISK -- The Advisor may not be able to match the
      performance of the Fund's benchmark.
 
    If the Fund meets its objective, the value of the Fund's shares will tend to
increase by the amount of the increase in value of the NASDAQ 100 Index-TM-.
However, when the value of the NASDAQ 100 Index-TM- declines, the value of the
Fund's shares should also decrease by the amount of the decrease in value of the
Index.
<PAGE>
                                                            PROSPECTUS  7
                                                                        --------
 
FUND PERFORMANCE AND FEE INFORMATION
 
OTC FUND PERFORMANCE
 
[LOGO]
         The bar chart and table below show the performance of the OTC Fund both
         year-by-year and as an average over different periods of time. The
         variability of performance over time provides an indication of the
         risks of investing in the Fund. Of course, this past performance does
         not necessarily indicate how the Fund will perform in the future.
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
             OTC FUND
<S>        <C>
1997             21.85%
1996             43.46%
1995             44.24%
</TABLE>
 
* THE YEAR-TO-DATE RETURN FOR THE PERIOD FROM JANUARY 1, 1998 THROUGH JUNE 30,
  1998 IS 35.96%.
DURING THE PERIOD SHOWN IN THE BAR CHART, THE HIGHEST RETURN FOR A QUARTER WAS
21.65% (QUARTER ENDED JUNE 30, 1995) AND THE LOWEST RETURN FOR A QUARTER WAS
- -9.67% (QUARTER ENDED DECEMBER 31, 1997).
 
<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURN (FOR PERIODS ENDING DECEMBER 31, 1997)(1)
                                                                 INVESTOR CLASS      NASDAQ 100 INDEX-TM-
                                                                     SHARES                   (2)
                                                               --------------------------------------------
<S>                                                            <C>                  <C>
  Past One Year                                                            21.85%              20.63%
  Since Inception (02/14/94)                                               26.00%              25.93%
</TABLE>
 
(1) THESE FIGURES ASSUME THE REINVESTMENT OF DIVIDENDS AND CAPITAL GAINS
    DISTRIBUTIONS.
(2) THE NASDAQ 100 INDEX-TM- IS AN UNMANAGED INDEX THAT IS A WIDELY RECOGNIZED
    INDICATOR OF OTC MARKET PERFORMANCE.
 
FEES AND EXPENSES OF THE FUND
    This table describes the fees and expenses that you may pay if you buy and
hold Investor Class Shares of the OTC Fund.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                               <C>
SHAREHOLDER FEES
  Redemption Fees*                                                                                     None
ANNUAL FUND OPERATING EXPENSES (EXPENSES THAT ARE DEDUCTED FROM NET ASSETS)
  Management Fees                                                                                      .75%
  Distribution (12b-1) Fees                                                                            None
  Other Expenses                                                                                       .38%
                                                                                                  ---------
  Total Annual Fund Operating Expenses                                                                1.13%
</TABLE>
 
* THE FUND MAY IMPOSE A WIRE TRANSFER CHARGE OF $15 ON CERTAIN REDEMPTIONS UNDER
  $5,000.
 
EXAMPLE
- --------------------------------------------------------------------------------
    This Example is intended to help you compare the cost of investing in the
OTC Fund with the cost of investing in other mutual funds.
    The Example assumes that you invest $10,000 in the Fund for the time period
indicated and 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 cost would be:
 
<TABLE>
<CAPTION>
   1 YEAR     3 YEARS    5 YEARS     10 YEARS
  --------------------------------------------
  <S>         <C>        <C>        <C>
    $115        $359       $622       $1,375
</TABLE>
<PAGE>
- ------
8  PROSPECTUS
 
                        FUND INFORMATION -- ARKTOS FUND
 
FUND OBJECTIVE
 
[LOGO]
          The Arktos Fund seeks to provide investment results that will match
          the performance of a specific benchmark. The Fund's current benchmark
is the inverse of the performance of the NASDAQ 100 Index-TM-.
 
PORTFOLIO INVESTMENTS
 
[LOGO]
          Unlike a traditional index fund, the Fund's benchmark is to perform
exactly opposite the NASDAQ 100 Index-TM-, and the Fund will not own the
securities included in the Index. Instead, as its primary investment strategy,
the Fund engages to a significant extent in short sales of securities, futures
contracts and options on: securities, futures contracts, and stock indexes. On a
day-to-day basis, the Fund holds U.S. Government securities to collateralize
these futures and options contracts. The Fund also may enter into repurchase
agreements.
 
RISK CONSIDERATIONS
 
[LOGO]
         The Arktos Fund is subject to a number of risks that will affect the
value of its shares, including:
 
    - EQUITY RISK -- The equity markets are volatile, and the value of the
      Fund's futures and options contracts and other securities may fluctuate
      drastically from day-to-day.
 
    - TRACKING ERROR RISK -- The Advisor may not be able to match the
      performance of the Fund's benchmark.
 
    If the Fund meets its objective, the value of the Fund's shares will tend to
increase during times when the value of the NASDAQ 100 Index-TM- is decreasing.
When the value of the NASDAQ 100 Index-TM- is increasing, however, the value of
the Fund's shares should decrease by an inversely proportionate amount (e.g., if
the NASDAQ 100 Index-TM- goes up by 10%, the value of the Fund's shares should
go down by 10%).
<PAGE>
                                                            PROSPECTUS  9
                                                                        --------
 
FUND PERFORMANCE AND FEE INFORMATION
 
[LOGO]
         As of August 1, 1998, the Arktos Fund had not commenced operations, and
         did not yet have a performance history.
 
FEES AND EXPENSES OF THE FUND
 
    This table describes the fees and expenses that you may pay if you buy and
hold Investor Class Shares of the Arktos Fund.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                               <C>
SHAREHOLDER FEES
  Redemption Fees*                                                                                     None
 
ANNUAL FUND OPERATING EXPENSES (EXPENSES THAT ARE DEDUCTED FROM NET ASSETS)
  Management Fees                                                                                      .90%
  Distribution (12b-1) Fees                                                                            None
  Other Expenses**                                                                                     .60%
                                                                                                  ---------
  Total Annual Fund Operating Expenses                                                                1.50%
</TABLE>
 
*  THE FUND MAY IMPOSE A WIRE TRANSFER CHARGE OF $15 ON CERTAIN REDEMPTIONS
   UNDER $5,000.
 
** OTHER EXPENSES ARE ESTIMATED.
 
EXAMPLE
- --------------------------------------------------------------------------------
 
    This Example is intended to help you compare the cost of investing in the
Arktos Fund with the cost of investing in other mutual funds.
 
    The Example assumes that you invest $10,000 in the Fund for the time period
indicated and 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 cost would be:
 
<TABLE>
<CAPTION>
   1 YEAR     3 YEARS
  --------------------
  <S>         <C>
    $153        $474
</TABLE>
<PAGE>
- ------
10  PROSPECTUS
 
                    FUND INFORMATION -- PRECIOUS METALS FUND
 
FUND OBJECTIVE
 
[LOGO]
          The Precious Metals Fund seeks to provide investment results that
correspond to a benchmark primarily for metals-related securities. The Fund's
current benchmark is the XAU Index.
 
PORTFOLIO INVESTMENTS
 
[LOGO]
          The Fund invests in securities of companies included in the XAU Index,
as well as securities whose performance is expected to track the performance of
the XAU Index. The Fund also may engage in futures and options transactions,
purchase ADRs and U.S. government securities, and enter into repurchase
agreements. The Fund may also invest a portion of its assets in securities of
foreign issuers.
 
RISK CONSIDERATIONS
 
[LOGO]
         The Precious Metals Fund is subject to a number of risks that will
         affect the value of the Fund's shares, including:
 
    - CONCENTRATION RISK -- The risk that the relatively few securities of
      issuers in the same industry (e.g., mining) that the Fund purchases will
      underperform the market as a whole. To the extent that the Fund's
      investments are concentrated in issuers conducting business in the same
      industry, the Fund is subject to legislative or regulatory changes,
      adverse market conditions and/or increased competition affecting that
      industry, as well as to the volatility of global prices for precious
      metals. The prices of precious metals may fluctuate widely due to changes
      in inflation or inflation expectations, currency fluctuations,
      speculation, worldwide demand and political developments in precious
      metals producing countries.
 
    - EQUITY RISK -- The equity markets are volatile, and the value of the
      Fund's securities and futures and options contracts may fluctuate
      drastically from day-to-day.
 
    - TRACKING ERROR RISK -- The Advisor may not be able to match the
      performance of the Fund's benchmark.
 
    If the Fund meets its objective, the value of the Fund's shares will tend to
increase by the amount of the increase in value of the XAU Index. However, when
the value of the XAU Index declines, the value of the Fund's shares should also
decrease by the amount of the decrease in value of the Index.
<PAGE>
                                                            PROSPECTUS  11
                                                                        --------
 
FUND PERFORMANCE AND FEE INFORMATION
 
PRECIOUS METALS FUND PERFORMANCE
 
[LOGO]
         The bar chart and table below show the performance of the Precious
         Metals Fund both year-by-year and as an average over different periods
         of time. The variability of performance over time provides an
         indication of the risks of investing in the Fund. Of course, this past
         performance does not necessarily indicate how the Fund will perform in
         the future.
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
            PRECIOUS METALS FUND
<S>        <C>
1997                       -37.62%
1996                        -2.62%
1995                        11.54%
1994                       -25.44%
</TABLE>
 
* THE YEAR-TO-DATE RETURN FOR THE PERIOD FROM JANUARY 1, 1998 THROUGH JUNE 30,
  1998 IS -4.18%.
DURING THE PERIOD SHOWN IN THE BAR CHART, THE HIGHEST RETURN FOR A QUARTER WAS
19.23% (QUARTER ENDED MARCH 31, 1996) AND THE LOWEST RETURN FOR A QUARTER WAS
- -32.91% (QUARTER ENDED DECEMBER 31, 1997).
 
<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURN (FOR PERIODS ENDING DECEMBER 31, 1997)(1)
                                                                          INVESTOR CLASS
                                                                              SHARES         XAU INDEX(2)
                                                                        ----------------------------------
<S>                                                                     <C>                  <C>
 Past One Year                                                                     -37.62%        -36.45%
  Since Inception (12/01/93)                                                       -14.06%        -11.26%
</TABLE>
 
(1) THESE FIGURES ASSUME THE REINVESTMENT OF DIVIDENDS AND CAPITAL GAINS
    DISTRIBUTIONS.
(2) THE XAU INDEX IS AN UNMANAGED INDEX THAT IS A WIDELY RECOGNIZED INDICATOR OF
    PRECIOUS METALS SECTOR PERFORMANCE.
 
FEES AND OPERATING EXPENSES OF THE FUND
    This table describes the fees and expenses that you may pay if you buy and
hold Investor Class Shares of the Precious Metals Fund.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                               <C>
SHAREHOLDER FEES
  Redemption Fees*                                                                                     None
ANNUAL FUND OPERATING EXPENSES (EXPENSES THAT ARE DEDUCTED FROM NET ASSETS)
  Management Fees                                                                                      .75%
  Distribution (12b-1) Fees                                                                            None
  Other Expenses                                                                                       .66%
                                                                                                  ---------
  Total Annual Fund Operating Expenses                                                                1.41%
</TABLE>
 
* THE FUND MAY IMPOSE A WIRE TRANSFER CHARGE OF $15 ON CERTAIN REDEMPTIONS UNDER
  $5,000.
 
EXAMPLE
- --------------------------------------------------------------------------------
    This Example is intended to help you compare the cost of investing in the
Precious Metals Fund with the cost of investing in other mutual funds.
    The Example assumes that you invest $10,000 in the Fund for the time period
indicated and 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 cost would be:
 
<TABLE>
<CAPTION>
   1 YEAR     3 YEARS    5 YEARS     10 YEARS
  --------------------------------------------
  <S>         <C>        <C>        <C>
    $144        $446       $771       $1,691
</TABLE>
<PAGE>
- ------
12  PROSPECTUS
 
                 FUND INFORMATION -- U.S. GOVERNMENT BOND FUND
 
FUND OBJECTIVE
 
[LOGO]
          The U.S. Government Bond Fund seeks to provide investment results that
correspond to a benchmark for U.S. Government securities. The Fund's current
benchmark is 120% of the price movement of the Long Treasury Bond.
 
PORTFOLIO INVESTMENTS
 
[LOGO]
          The Fund invests principally in U.S. Government securities, futures
contracts, and options. Some of the Fund's U.S. Government securities will be
used to collateralize these futures and options. Futures and options contracts,
if used properly, may enable the Fund to meet its objective by increasing the
Fund's exposure to the securities included in its benchmark. In addition, the
Fund may enter into transactions involving zero coupon U.S. Treasury bonds and
repurchase agreements.
 
RISK CONSIDERATIONS
 
[LOGO]
         The U.S. Government Bond Fund is subject to a number of risks that will
affect the value of its shares, including:
 
    - FIXED INCOME RISK -- The Fund's fixed income investments will change in
      value in response to interest rate changes and other factors. In addition,
      the value of securities with longer maturities will fluctuate more in
      response to interest rate changes.
 
    - LEVERAGING RISK -- The Fund invests a percentage of its assets in
      leveraged instruments, such as certain futures and options contracts. The
      more the Fund invests in these leveraged instruments, the more this
      leverage will magnify the Fund's gains or losses on those investments.
 
    - TRACKING ERROR RISK -- The Advisor may not be able to match the
      performance of the Fund's benchmark.
 
    If the Fund meets its objective, the value of the Fund's shares should
increase by 120% of any price increase by the Long Treasury Bond. In contrast,
when the price of the Long Treasury Bond declines, the value of the Fund's
shares should decline by 120% of any price decline of the Long Treasury Bond.
<PAGE>
                                                            PROSPECTUS  13
                                                                        --------
 
FUND PERFORMANCE AND FEE INFORMATION
 
U.S. GOVERNMENT BOND FUND PERFORMANCE
 
[LOGO]
         The bar chart and table below show the performance of the U.S.
         Government Bond Fund both year-by-year and as an average over different
         periods of time. The variability of performance over time provides an
         indication of the risks of investing in the Fund. Of course, this past
         performance does not necessarily indicate how the Fund will perform in
         the future.
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
              U.S. GOVERNMENT BOND FUND
<S>        <C>
1997                                16.36%
1996                                -7.09%
1995                                36.14%
1994                               -17.96%
</TABLE>
 
* THE YEAR-TO-DATE RETURN FOR THE PERIOD FROM JANUARY 1, 1998 THROUGH JUNE 30,
  1998 IS 7.10%.
DURING THE PERIOD SHOWN IN THE BAR CHART, THE HIGHEST RETURN FOR A QUARTER WAS
13.9% (QUARTER ENDED JUNE 30, 1995) AND THE LOWEST RETURN FOR A QUARTER WAS
- -10.68% (QUARTER ENDED MARCH 31, 1996).
 
<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURN (FOR PERIODS ENDING DECEMBER 31, 1997)(1)
                                                           INVESTOR CLASS
                                                               SHARES         LEHMAN LONG TREASURY INDEX(2)
                                                         --------------------------------------------------
<S>                                                      <C>                  <C>
  Past One Year                                                      16.37%                  7.80%
  Since Inception (01/03/94)                                          4.84%                 -0.18%
</TABLE>
 
(1) THESE FIGURES ASSUME THE REINVESTMENT OF DIVIDENDS AND CAPITAL GAINS
    DISTRIBUTIONS.
(2) THE LEHMAN LONG TREASURY INDEX IS AN UNMANAGED INDEX THAT IS A WIDELY
    RECOGNIZED INDICATOR OF U.S. GOVERNMENT BOND PERFORMANCE.
 
FEES AND EXPENSES OF THE FUND
    This table describes the fees and expenses that you may pay if you buy or
hold Investor Class Shares of the U.S. Government Bond Fund.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                               <C>
SHAREHOLDER FEES
  Redemption Fees*                                                                                     None
ANNUAL FUND OPERATING EXPENSES (EXPENSES THAT ARE DEDUCTED FROM NET ASSETS)
  Management Fees                                                                                      .50%
  Distribution (12b-1) Fees                                                                            None
  Other Expenses                                                                                       .61%
                                                                                                  ---------
  Total Annual Fund Operating Expenses                                                                1.11%
</TABLE>
 
* THE FUND MAY IMPOSE A WIRE TRANSFER CHARGE OF $15 ON CERTAIN REDEMPTIONS UNDER
  $5,000.
 
EXAMPLE
- --------------------------------------------------------------------------------
    This Example is intended to help you compare the cost of investing in the
Bond Fund with the cost of investing in other mutual funds.
    The Example assumes that you invest $10,000 in the Fund for the time period
indicated and 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 cost would be:
 
<TABLE>
<CAPTION>
   1 YEAR     3 YEARS    5 YEARS     10 YEARS
  --------------------------------------------
  <S>         <C>        <C>        <C>
    $113        $353       $612       $1,352
</TABLE>
<PAGE>
- ------
14  PROSPECTUS
 
                         FUND INFORMATION -- JUNO FUND
 
FUND OBJECTIVE
 
[LOGO]
          The Juno Fund seeks to provide total returns that will inversely
          correlate to the price movements of a benchmark for U.S. Treasury debt
instruments or futures contract on a specified debt instrument. The Fund's
current benchmark is the inverse of the price movement of the Long Treasury
Bond.
 
PORTFOLIO INVESTMENTS
 
[LOGO]
          Unlike a traditional fund, the Fund's benchmark is to perform exactly
opposite the Long Treasury Bond. As its primary investment strategy, the Fund
enters into short sales and engages in futures and options transactions. On a
day-to-day basis, the Fund holds U.S. Government securities to collateralize
these obligations. The Fund also may enter into repurchase agreements.
 
RISK CONSIDERATIONS
 
[LOGO]
         The Juno Fund is subject to a number of risks that will affect the
         value of its shares, including:
 
    - FIXED INCOME RISK -- The Fund's fixed income investments will change in
      value in response to interest rate changes and other factors. In addition,
      the value of securities with longer maturities will fluctuate more in
      response to interest rate changes.
 
    - TRACKING ERROR RISK -- The Advisor may not be able to match the
      performance of the Fund's benchmark.
 
    If the Fund meets its objective, the value of the Fund's shares will tend to
increase during periods when the price of the Long Treasury Bond decreases. When
the price of the Long Treasury Bond increases, however, the value of the Fund's
shares should decrease by an inversely proportionate amount (e.g., if the price
of the Long Treasury Bond increases by 2%, the value of the Fund's shares should
go down by 2%).
<PAGE>
                                                            PROSPECTUS  15
                                                                        --------
 
FUND PERFORMANCE AND FEE INFORMATION
 
JUNO FUND PERFORMANCE
 
[LOGO]
         The bar chart and table below show the performance of Juno Fund both
         year-by-year and as an average over different periods of time. The
         variability of performance over time provides an indication of the
         risks of investing in the Fund. Of course, this past performance does
         not necessarily indicate how the Fund will perform in the future.
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
            JUNO FUND
<S>        <C>
1997             -5.56%
1996                 8%
</TABLE>
 
* THE YEAR-TO-DATE PERFORMANCE FOR THE PERIOD FROM JANUARY 1, 1998 THROUGH JUNE
  30, 1998 IS -1.86%.
DURING THE PERIOD SHOWN IN THE BAR CHART, THE HIGHEST RETURN FOR A QUARTER WAS
8.77% (QUARTER ENDED MARCH 31, 1996) AND THE LOWEST RETURN FOR A QUARTER WAS
- -7.9% (QUARTER ENDED JUNE 30, 1995).
 
<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURN (FOR PERIODS ENDING DECEMBER 31, 1997)(1)
                                                           INVESTOR CLASS
                                                               SHARES          LEHMAN LONG TREASURY INDEX(2)
                                                         ----------------------------------------------------
<S>                                                      <C>                  <C>
 Past One Year                                                       -5.56%                   7.80%
  Since Inception (03/03/95)                                         -4.72%                   5.58%
</TABLE>
 
(1) These figures assume the reinvestment of dividends and capital gains
    distributions.
(2) The Lehman Long Treasury Index is an unmanaged index that is a widely
    recognized indicator of U.S. government bond performance.
 
FEES AND EXPENSES OF THE FUND
    This table describes the fees and expenses that you may pay if you buy and
hold Investor Class Shares of the Juno Fund.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                               <C>
SHAREHOLDER FEES
  Redemption Fees*                                                                                     None
ANNUAL FUND OPERATING EXPENSES (EXPENSES THAT ARE DEDUCTED FROM NET ASSETS)
  Management Fees                                                                                      .90%
  Distribution (12b-1) Fees                                                                            None
  Other Expenses                                                                                       .69%
                                                                                                  ---------
  Total Annual Fund Operating Expenses                                                                1.59%
</TABLE>
 
* THE FUND MAY IMPOSE A WIRE TRANSFER CHARGE OF $15 ON CERTAIN REDEMPTIONS UNDER
  $5,000.
 
EXAMPLE
- --------------------------------------------------------------------------------
    This Example is intended to help you compare the cost of investing in the
Juno Fund with the cost of investing in other mutual funds.
    The Example assumes that you invest $10,000 in the Fund for the time period
indicated and 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 cost would be:
 
<TABLE>
<CAPTION>
   1 YEAR     3 YEARS    5 YEARS     10 YEARS
  --------------------------------------------
  <S>         <C>        <C>        <C>
    $162        $502       $866       $1,889
</TABLE>
<PAGE>
- ------
16  PROSPECTUS
 
             FUND INFORMATION -- U.S. GOVERNMENT MONEY MARKET FUND
 
FUND OBJECTIVE
 
[LOGO]
          The U.S. Government Money Market Fund seeks to provide security of
principal, high current income, and liquidity.
 
PORTFOLIO INVESTMENTS
 
[LOGO]
          The U.S. Government Money Market Fund invests primarily in money
market instruments issued or guaranteed as to principal and interest by the U.S.
Government, its agencies or instrumentalities, and enters into repurchase
agreements fully collateralized by U.S. Government securities.
 
RISK CONSIDERATIONS
 
[LOGO]
         The U.S. Government Money Market Fund is subject to the following risk
that will potentially affect the value of its shares:
 
    - INTEREST RATE RISK -- The Fund's securities are subject to Interest Rate
      Risk, which is the potential for decline in the price of the Fund's
      securities due to rising interest rates.
 
    In addition, the U.S. Government Money Market Fund is governed by SEC rules
which impose certain liquidity, maturity and diversification requirements. All
securities purchased by the Fund must have remaining maturities of 397 days or
less. The Fund's assets are valued using the amortized cost method, which
enables the Fund to maintain a stable price of $1.00 per share. ALTHOUGH THE
FUND IS MANAGED TO MAINTAIN A STABLE PRICE PER SHARE OF $1.00, THERE IS NO
GUARANTEE THAT THE PRICE WILL BE CONSTANTLY MAINTAINED, AND IT IS POSSIBLE TO
LOSE MONEY.
<PAGE>
                                                            PROSPECTUS  17
                                                                        --------
 
FUND PERFORMANCE AND FEE INFORMATION
 
U.S. GOVERNMENT MONEY MARKET FUND PERFORMANCE
 
[LOGO]
         The bar chart and table below show the performance of the U.S.
         Government Money Market Fund both year-by-year and as an average over
         different periods of time. The variability of performance over time
         provides an indication of the risks of investing in the Fund. Of
         course, this past performance does not necessarily indicate how the
         Fund will perform in the future.
 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<CAPTION>
               U.S. GOVERNMENT MONEY MARKET FUND
<S>        <C>
1997                                           4.60%
1996                                           4.38%
1995                                           4.90%
</TABLE>
 
* THE YEAR-TO-DATE RETURN FOR THE PERIOD FROM JANUARY 1, 1998 THROUGH JUNE 30,
  1998 IS 2.36%.
DURING THE PERIOD SHOWN IN THE BAR CHART, THE HIGHEST RETURN FOR A QUARTER WAS
1.24% (QUARTER ENDED JUNE 30, 1995) AND THE LOWEST RETURN FOR A QUARTER WAS .50%
(QUARTER ENDED MARCH 31, 1994).
 
<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURN (FOR PERIODS ENDING DECEMBER 31, 1997)(1)
                                                       INVESTOR CLASS SHARES   90-DAY TREASURY COMPOSITE(2)
                                                      ------------------------------------------------------
<S>                                                   <C>                      <C>
 Past One Year                                                    4.60%                       5.53%
  Since Inception (12/03/93)                                      4.27%                       5.28%
</TABLE>
 
(1) THESE FIGURES ASSUME THE REINVESTMENT OF DIVIDENDS AND CAPITAL GAINS
    DISTRIBUTIONS.
(2) THE 90-DAY TREASURY COMPOSITE INDEX IS AN UNMANAGED INDEX THAT IS A WIDELY
    RECOGNIZED INDICATOR OF GENERAL MONEY MARKET PERFORMANCE.
 
YIELD - As of June 30, 1998, the current yield of the Fund was 5.01%.
 
FEES AND EXPENSES OF THE FUND
    This table describes the fees and expenses that you may pay if you buy and
hold Investor Class Shares of the U.S. Government Money Market Fund.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                               <C>
SHAREHOLDER FEES
  Redemption Fees*                                                                                     None
ANNUAL FUND OPERATING EXPENSES (EXPENSES THAT ARE DEDUCTED FROM NET ASSETS)
  Management Fees                                                                                      .50%
  Distribution (12b-1) Fees                                                                            None
  Other Expenses                                                                                       .39%
                                                                                                  ---------
  Total Annual Fund Operating Expenses                                                                 .89%
</TABLE>
 
* THE FUND MAY IMPOSE A WIRE TRANSFER CHARGE OF $15 ON CERTAIN REDEMPTIONS UNDER
  $5,000.
 
EXAMPLE
- --------------------------------------------------------------------------------
    This Example is intended to help you compare the cost of investing in the
U.S. Government Money Market Fund with the cost of investing in other mutual
funds.
    The Example assumes that you invest $10,000 in the Fund for the time period
indicated and 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 cost would be:
 
<TABLE>
<CAPTION>
   1 YEAR     3 YEARS    5 YEARS     10 YEARS
  --------------------------------------------
  <S>         <C>        <C>        <C>
     $91        $284       $493       $1,096
</TABLE>
<PAGE>
- ------
18  PROSPECTUS
 
MORE INFORMATION ABOUT RISK
 
    As indicated below, the Funds are subject to a number of risks that may
affect the value of Fund shares.
 
EQUITY RISK (NOVA, URSA, OTC, ARKTOS AND PRECIOUS METALS FUNDS) -- The Funds may
invest in public and privately issued equity securities, including common and
preferred stocks, warrants, and rights, as well as instruments that attempt to
track the price movement of equity indices. Investments in equity securities and
equity derivatives in general are subject to market risks that may cause their
prices to fluctuate over time. The value of securities convertible into equity
securities, such as warrants or convertible debt, is also affected by prevailing
interest rates, the credit quality of the issuer and any call provision.
Fluctuations in the value of equity securities in which the Funds invest will
cause the net asset value of the Funds to fluctuate. An investment in the Funds
may be more suitable for long-term investors who can bear the risk of short-term
principal fluctuations.
 
FIXED INCOME RISK (U.S. GOVERNMENT BOND AND JUNO FUNDS) -- The market value of
fixed income investments will change in response to interest rate changes and
other factors. During periods of falling interest rates, the values of
outstanding fixed income securities generally rise. Conversely, during periods
of rising interest rates, the values of such securities generally decline.
Moreover, while securities with longer maturities tend to produce higher yields,
the prices of longer maturity securities are also subject to greater market
fluctuations as a result of changes in interest rates.
 
TRACKING ERROR RISK (ALL FUNDS EXCEPT U.S. GOVERNMENT MONEY MARKET FUND) --
While the Funds do not expect returns to deviate from their respective
benchmarks by more than ten percent, factors such as Fund expenses, imperfect
correlation between the Funds' investments and those of their benchmarks,
rounding of share prices, changes to the benchmark, regulatory policies, and
leverage, may affect their ability to achieve perfect correlation. The magnitude
of any tracking error may be affected by a higher portfolio turnover rate.
 
TRADING HALT RISK (NOVA, URSA, U.S. GOVERNMENT BOND AND JUNO FUNDS) -- The Funds
typically will hold short-term options and futures contracts. The major
exchanges on which these contracts are traded, such as the Chicago Mercantile
Exchange ("CME"), have established limits on how much an option or futures
contract may decline over various time periods within a day. If an option or
futures contract's price declines more than the established limits, trading on
the exchange is halted on that instrument. If a trading halt occurs at the close
of a trading day, a Fund may not be able to purchase or sell options or futures
contracts. In such an event, a Fund also may be required to use a "fair-value"
method to price its outstanding contracts.
<PAGE>
                                                            PROSPECTUS  19
                                                                        --------
 
LEVERAGING RISK (NOVA AND U.S. GOVERNMENT BOND FUNDS) -- Leveraging activities
include, among other things, borrowing and the use of short sales, options and
futures. There are risks associated with leveraging activities, including:
 
    - A Fund experiencing losses over certain ranges in the market that exceed
      losses experienced by a non-leveraged Fund.
 
    - There may be an imperfect or no correlation between the changes in market
      value of the securities held by a Fund and the prices of futures and
      options on futures.
 
    - Although the Funds will only purchase exchange-traded futures and options,
      due to market conditions there may not be a liquid secondary market for a
      futures contract or option. As a result, the Funds may be unable to close
      out their futures or options contracts at a time which is advantageous.
 
    - Trading restrictions or limitations may be imposed by an exchange, and
      government regulations may restrict trading in futures contracts and
      options.
 
In addition, the following leveraged instruments are subject to certain specific
risks:
 
    FUTURES RISK -- Futures contracts and options on futures contracts provide
    for the future sale by one party and purchase by another party of a
    specified amount of a specific security at a specified future time and at a
    specified price. An option on a futures contract gives the purchaser the
    right, in exchange for a premium, to assume a position in a futures contract
    at a specified exercise price during the term of the option. Index futures
    are futures contracts for various indices that are traded on registered
    securities exchanges.
 
    The Funds may use futures contracts and related options for bona fide
    hedging purposes to offset changes in the value of securities held or
    expected to be acquired. They may also be used to gain exposure to a
    particular market or instrument, to create a synthetic money market
    position, and for certain other tax-related purposes. The Fund will only
    enter into futures contracts traded on a national futures exchange or board
    of trade.
 
    OPTIONS RISK -- The buyer of an option acquires the right to buy (a call
    option) or sell (a put option) a certain quantity of a security (the
    underlying security) or instrument at a certain price up to a specified
    point in time. The seller or writer of an option is obligated to sell (a
    call option) or buy (a put option) the underlying security. When writing
    (selling) call options on securities, the Funds may cover its position by
    owning the underlying security on which the option is written or by owning a
    call option on the underlying security. Alternatively, the Funds may cover
    its position by maintaining in a segregated account cash or liquid
    securities equal in value to the exercise price of the call option written
    by the Funds.
<PAGE>
- ------
20  PROSPECTUS
 
    Because option premiums paid or received by the Funds are small in relation
    to the market value of the investments underlying the options, buying and
    selling put and call options can be more speculative than investing directly
    in securities.
 
    SHORT SALES RISK -- Short sales are transactions in which a Fund sells a
    security it does not own. To complete the transaction, the Fund must borrow
    the security to make delivery to the buyer. The Fund is then obligated to
    replace the security borrowed by purchasing the security at the market price
    at the time of replacement. The price at such time may be more or less than
    the price at which the security was sold by the Fund.
 
PORTFOLIO TURNOVER RATE RISK (PRECIOUS METALS, OTC AND U.S. GOVERNMENT BOND
FUNDS) -- The Trust anticipates that investors that are part of a tactical or
strategic asset-allocation strategy will frequently redeem or exchange shares of
a Fund, which will cause that Fund to experience high portfolio turnover. A
higher portfolio turnover rate may result in a Fund paying higher levels of
transaction costs and generating greater tax liabilities for shareholders.
 
CONCENTRATION RISK (PRECIOUS METALS FUND) -- Since the Precious Metals Fund
invests in the securities of a limited number of issuers conducting business in
a specific industry, it is subject to the risk that those issuers (or that
industry) will perform poorly, and the Fund will be negatively impacted by that
poor performance. In addition, the prices of precious metals may fluctuate
widely due to changes in inflation or inflation expectations, currency
fluctuations, speculation, worldwide demand and political developments in
precious metals-producing countries. None of the other Funds will invest 25% or
more of the value of the Fund's total assets in the securities of one or more
issuers conducting their principal business activities in the same industry;
EXCEPT THAT, to the extent the benchmark selected for a particular Fund is
concentrated in a particular industry, the Fund will necessarily be concentrated
in that industry. This limitation does not apply to investments or obligations
of the U.S. Government or any of its agencies or instrumentalities.
 
EARLY CLOSING RISK (OTC AND ARKTOS FUNDS) -- The normal close of trading of
securities listed on the National Association of Securities Dealers Automated
Quotations system ("NASDAQ") and the New York Stock Exchange ("NYSE") is 4:00
P.M., Eastern Time. Unanticipated early closings may result in a Fund being
unable to sell or buy securities on that day. If an exchange closes early on a
day when one or more of the Funds needs to execute a high volume of securities
trades late in a trading day, a Fund might incur substantial trading losses.
 
YEAR 2000 RISK (ALL FUNDS) -- The Funds depend on the smooth functioning of
computer systems in almost every aspect of their business. Like other mutual
funds, businesses and individuals around the world, the Funds could be adversely
affected if the computer systems used by its service providers do not properly
process dates on and after January 1, 2000 and distinguish between the year 2000
and the year 1900. The Trust has asked their service providers whether they
expect to have
<PAGE>
                                                            PROSPECTUS  21
                                                                        --------
 
their computer systems adjusted for the year 2000 transition, and received
assurances from all that they are devoting significant resources to prevent
material adverse consequences to the Funds. The Funds and their respective
shareholders may experience losses if these assurances prove to be incorrect or
as a result of year 2000 computer difficulties experienced by issuers of
portfolio securities or third parties, such as custodians, banks, broker-dealers
or others with which the Funds do business.
 
FOREIGN COMPANY RISKS (PRECIOUS METALS FUND) -- Investments in securities of
foreign companies can be more volatile than investments in U.S. companies.
Diplomatic, political, or economic developments could affect investments in
foreign countries. Foreign companies generally are not subject to uniform
accounting, auditing, and financial reporting standards comparable to those
applicable to U.S. domestic companies.
 
                            SHAREHOLDER INFORMATION
 
HOW TO INVEST IN THE FUNDS
 
PURCHASING SHARES
 
    Shares are offered continuously, and may be purchased on any day that the
NYSE is open for business (a "Business Day"). The price per share (the offering
price) will be the net asset value per share ("NAV") next determined after your
purchase order is received by the Trust. No sales charges are imposed on initial
or subsequent investments in a Fund. NAV is calculated by (1) taking the current
market value of a Fund's total assets, (2) subtracting the liabilities, and (3)
dividing that amount by the total number of shares owned by shareholders. For
most Funds, the NAV is calculated once each Business Day after the close of the
New York Stock Exchange (currently, 4:00 p.m., Eastern Time) and the settlement
time for the Funds' futures and options contracts, if any (typically, 4:15 p.m.,
Eastern Time). The NAV of the Bond Fund and the Juno Fund is determined each day
on which the Chicago Board of Trade ("CBOT") is open for trading futures
contracts on U.S. Treasury bonds as of the close of normal trading on the CBOT
(normally 3:00 P.M., Eastern Time). If the exchange or market where a Fund's
securities or other investments are primarily traded closes early, the NAV may
be calculated earlier. To receive the current Business Day's NAV, the Trust must
receive your purchase order before the cutoff times specified below for each
method of investing.
 
MINIMUM INVESTMENT
 
    If a registered investment advisor has discretionary authority over your
account, the minimum initial investment in the Investor Class Shares of the
Funds is $15,000. For all other shareholder accounts ("Self-Directed Accounts"),
the minimum initial investment in the Investor Class Shares of the Funds is
$25,000. These minimums also apply to retirement plan accounts. The Trust, at
its discretion, may accept lesser amounts in certain circumstances. If you
invest in the Trust without designating which Fund you want to invest in on your
account application, your check or your wire
<PAGE>
- ------
22  PROSPECTUS
 
advice, your money will be invested in the Money Market Fund until you tell us
where to invest your money. There is no minimum amount for subsequent
investments in a Fund. The Trust reserves the right to modify its minimum
investment requirements at any time. The Trust also reserves the right to reject
or refuse, at the Trust's discretion, any order for the purchase of a Fund's
shares in whole or in part.
 
    Investments in the Funds may be made (i) through securities brokers and
dealers or other financial institutions who have the responsibility to transmit
orders promptly and who may charge a processing fee for purchases, redemptions
or exchanges of shares, or (ii) directly with the Trust by mail or by bank wire
transfer as follows:
 
BY MAIL
 
    Initial applications and investments, as well as subsequent investments, in
the Funds made BY MAIL must be received in good form by the Trust, on any
Business Day, at or prior to 2:00 p.m., Eastern Time, in order to be processed
for that Business Day's NAV. Fill out an application and make a check payable to
"Rydex Series Trust." Mail the check, along with the application to:
 
      Rydex Series Trust
     6116 Executive Boulevard, Suite 400
     Rockville, Maryland 20852
 
IN ADDITION TO CHARGES DESCRIBED ELSEWHERE IN THIS PROSPECTUS, THE TRUST ALSO
MAY CHARGE $25.00 FOR CHECKS RETURNED FOR INSUFFICIENT OR UNCOLLECTIBLE FUNDS.
 
BY BANK WIRE TRANSFER
 
    First, fill out an application and fax the completed application, along with
a request for a shareholder account number, to the Trust at 301-468-8585. Then,
request that your bank wire transfer the purchase amount to our custodian, Star
Bank, N.A., along with the following instructions:
 
      Star Bank, N.A.
     Cincinnati, Ohio
     Routing Number: 0420-00013
     For Account of Rydex Series Trust
     Trust Account Number: 48038-9030
     [Your Name]
     [Your Shareholder Account Number and Fund Designation]
 
AFTER INSTRUCTING YOUR BANK TO TRANSFER MONEY BY WIRE FOR BOTH INITIAL AND
SUBSEQUENT PURCHASES, YOU MUST CALL THE TRUST AT 1-800-820-0888 AND INFORM THE
TRUST AS TO THE AMOUNT THAT YOU HAVE TRANSFERRED AND THE NAME OF THE BANK
SENDING THE TRANSFER IN ORDER TO OBTAIN SAME-DAY PRICING OR CREDIT. FOR INITIAL
PURCHASES, YOU MUST ALSO SUPPLY THE TIME
<PAGE>
                                                            PROSPECTUS  23
                                                                        --------
 
THE WIRE WAS SENT AND THE FED WIRE REFERENCE NUMBER. YOUR BANK MAY CHARGE A FEE
FOR SUCH SERVICES. IF THE PURCHASE IS CANCELED BECAUSE YOUR WIRE TRANSFER IS NOT
RECEIVED, YOU MAY BE LIABLE FOR ANY LOSS THAT THE TRUST INCURS.
 
    Wire transfers for both initial investments (which must be preceded by a
faxed application) and subsequent investments in the Funds must be received in
good form at the Trust, on any Business Day, at or prior to the cutoff time of
the Funds as outlined in the "EXCHANGES" section (1:00 p.m., Eastern Time, for
the Money Market Fund) in order to be processed at that Business Day's NAV. An
initial application that is faxed to the Trust does not constitute a purchase
order until the application has been processed and correct payment by check or
wire transfer has been received by the Trust.
 
TAX-QUALIFIED RETIREMENT PLANS
 
    Investors may purchase shares of the Funds through any of the following
types of tax-qualified retirement plans:
 
      Individual Retirement Accounts (IRAs, including Roth IRAs)
     Keogh Accounts -- Defined Contribution Plans (Profit Sharing Plans)
     Keogh Accounts -- Pension Plans (Money Purchase Plans)
     Internal Revenue Code Section 403(b) Plans
 
    For retirement plan accounts that have engaged a registered investment
advisor with discretionary authority over the retirement plan account with the
Trust, the minimum initial investment in Investor Class Shares of the Funds is
$15,000. For retirement plan accounts that are Self-Directed Accounts, the
minimum initial investment in Investor Class Shares of the Funds is $25,000.
 
    Retirement plans are charged an annual $15.00 maintenance fee and a $15.00
account closing fee. Additional information regarding these accounts, including
the annual maintenance fee, may be obtained by calling 1-800-820-0888 or
301-468-8520.
 
REDEEMING FUND SHARES
 
GENERAL
 
    You may redeem all or any portion of your Fund shares at the next determined
NAV after receipt of the redemption request (subject to applicable account
minimums). You may redeem your shares by letter or by telephone subject to the
procedures set forth below. Your redemption proceeds normally will be sent
within five Business Days of the Trust receiving your request. For investments
made by check, payment on redemption requests may be delayed until the Trust's
transfer agent is reasonably satisfied that payment has been collected by the
Trust (which may require up to 10 Business Days). If you invest by check, you
may not wire out any redemption proceeds for the 30 calendar days following the
purchase. You may avoid a delay in receiving redemption proceeds by purchasing
shares with a certified check. Telephone redemptions will be sent only to your
address or your bank
<PAGE>
- ------
24  PROSPECTUS
 
account (as listed in the Trust's records). The Trust may charge $15 for certain
wire transfers of redemption proceeds.
 
    The proceeds of non-telephone redemptions will be sent directly to your
address (as listed in the Trust's records). If you request payment of redemption
proceeds to a third party or to a location other than your address or your bank
account (as listed in the Trust's records), this request must be in writing and
must include a signature guarantee.
 
    REDEMPTIONS FROM TAX-QUALIFIED RETIREMENT PLANS MAY HAVE ADVERSE TAX
CONSEQUENCES. YOU SHOULD CONSULT YOUR TAX ADVISOR BEFORE REDEEMING SHARES FROM
YOUR TAX-QUALIFIED ACCOUNT.
 
INVOLUNTARY REDEMPTIONS
 
    Because of the administrative expense of handling small accounts, any
request for a redemption when your account balance (a) is below the currently
applicable minimum investment, or (b) would be below that minimum as a result of
the redemption, will be treated as a request for the complete redemption of that
account. If, due to withdrawals or transfers, your account balance drops below
the required minimum of $15,000 ($25,000 for Self-Directed Accounts), the Trust
reserves the right to redeem your remaining shares without any additional
notification to you.
 
SUSPENSION OF REDEMPTIONS
 
    With respect to each Fund, and as permitted by the Securities and Exchange
Commission ("Commission"), the right of redemption may be suspended, or the date
of payment postponed: (i) for any period during which the NYSE, the Federal
Reserve Bank of New York (the "New York Fed"), NASDAQ, the CME, the Chicago
Board Options Exchange ("CBOE"), or the CBOT, as appropriate, is closed (other
than customary weekend or holiday closings) or trading on the NYSE, NASDAQ, the
CME, the CBOE, or the CBOT, as appropriate, is restricted; (ii) for any period
during which an emergency exists so that disposal of Fund investments or the
determination of NAV is not reasonably practicable; or (iii) for such other
periods as the Commission, by order, may permit for protection of Fund
investors. On any day that the New York Fed or the NYSE closes early, the
principal government securities and corporate bond markets close early (such as
on days in advance of holidays generally observed by participants in these
markets), or as permitted by the Commission, the right is reserved to advance
the time on that day by which purchase and redemption orders must be received.
 
EXCHANGES
 
    You may exchange Investor Class Shares of any Fund for Investor Class Shares
of any other Rydex Fund on the basis of the respective net asset values of the
shares involved. An exchange involving a Self-Directed Account must be for at
least the lesser of $1,000 or 100% of the account value of the Rydex Fund from
which the redemption is to be made. The Trust currently is composed
<PAGE>
                                                            PROSPECTUS  25
                                                                        --------
 
of twenty-two separate Funds. Investor Class Shares of 14 Sector Funds and
Advisor Class Shares of certain Funds are offered in separate prospectuses.
Exchanges may be made by letter or by telephone subject to the procedures set
forth below.
 
    To exchange your shares, you need to provide certain information, including
the name on the account, the account number (or your taxpayer identification
number), the number or dollar value of shares (or the percentage of the total
value of your account) you want to exchange, and the names of the Rydex Funds
involved in the exchange transaction. If you are contemplating an exchange for
shares of a Rydex Fund not described in this Prospectus, you should obtain and
review the current prospectus of that Rydex Fund before making the exchange.
 
    Exchange orders into other Rydex Funds must be received by the time set
forth below for either the relevant Rydex Fund from which an exchange is being
made and into which an exchange is being made (whichever is earlier):
 
<TABLE>
<CAPTION>
FUND(S)                                                                          CUT OFF TIME
- ----------------------------------------------------------------------------------------------
<S>                                                                             <C>
Nova                                                                              3:45 p.m.
Ursa
OTC
Arktos
- ----------------------------------------------------------------------------------------------
Rydex Sector Funds                                                                3:30 p.m.
Precious Metals
- ----------------------------------------------------------------------------------------------
U.S. Government Bond                                                              2:45 p.m.
Juno
</TABLE>
 
    The exchange privilege may be modified or discontinued at any time.
 
PROCEDURES FOR REDEMPTIONS AND EXCHANGES
 
    Written requests for redemptions and exchanges should be sent to Rydex
Series Trust, 6116 Executive Boulevard, Suite 400, Rockville, Maryland 20852,
and should be signed by the record owner or owners. With proper authorization,
telephone and electronic redemption and transfer requests are also permitted.
Telephone redemption and exchange requests may be made by calling 1-800-820-0888
or 301-468-8520 by 3:30 p.m., Eastern Time, or by any earlier cutoff time
specified above for exchanges between Funds, on any Business Day. The Trust
reserves the right to suspend the right of redemption in accordance with this
Prospectus. The Trust's offices are open between 8:30 a.m. and 5:30 p.m.,
Eastern Time on each Business Day.
<PAGE>
- ------
26  PROSPECTUS
 
TRANSACTIONS OVER THE TELEPHONE
 
    Telephone redemption and exchange transactions are extremely convenient, but
are not risk-free. To ensure that your telephone transactions are safe, secure,
and as risk-free as possible, the Trust has instituted certain safeguards and
procedures for determining the identity of callers and authenticity of
instructions, including recording telephone inquiries. As a result, neither the
Trust nor its transfer agent will be responsible for any loss, liability, cost,
or expense for following telephone or wire instructions they reasonably believe
to be genuine. If you make exchange or redemption requests by telephone, you
will generally bear the risk of any loss. If you are unable to reach the Trust
by telephone, you may want to try to reach the Trust by other means.
 
MANAGEMENT
 
THE ADVISOR'S INVESTMENT METHODOLOGY
 
    In managing the Funds, the Advisor's primary objective is to match the
performance of each Fund's benchmark as closely as possible. Through the use of
quantitative analysis techniques, each Fund is structured to match the risk and
return characteristics of the appropriate benchmark, while remaining fully
invested in all market environments. The Advisor monitors each Fund on an
ongoing basis, and makes adjustments, as necessary, to minimize tracking error
and to maximize liquidity. The Advisor may utilize options contracts to leverage
a Fund's investment exposure. In addition, some Funds may require short selling
techniques designed to inversely correlate to the performance of an index or
benchmark.
 
MANAGEMENT OF THE FUNDS
 
THE INVESTMENT ADVISOR -- PADCO Advisors, Inc., a Maryland corporation with
offices at 6116 Executive Boulevard, Suite 400, Rockville, Maryland 20852,
serves as investment advisor and manager of the Funds. Albert P. Viragh, Jr.,
the Chairman of the Board and the President of the Advisor, owns a controlling
interest in the Advisor. From 1985 until the incorporation of the Advisor, Mr.
Viragh was a Vice President of Money Management Associates ("MMA"), a
Maryland-based registered investment advisor. From 1992 to June 1993, Mr. Viragh
was the portfolio manager of The Rushmore Nova Portfolio, a series of The
Rushmore Fund, Inc., an investment company managed by MMA.
 
    The Advisor makes investment decisions for the assets of the Funds and
continuously reviews, supervises, and administers each Fund's investment
program. The Trustees of the Trust supervise the Advisor and establish policies
that the Advisor must follow in its day-to-day management activities. Under an
investment advisory agreement between the Trust and the Advisor, the Funds pay
the
<PAGE>
                                                            PROSPECTUS  27
                                                                        --------
 
Advisor a fee at an annualized rate, based on the average daily net assets for
each Fund, as set forth below:
 
<TABLE>
<CAPTION>
FUND                                                                             ADVISORY FEE
- ----------------------------------------------------------------------------------------------
<S>                                                                             <C>
Nova                                                                                 .75%
Ursa                                                                                 .90%
OTC                                                                                  .75%
Arktos                                                                               .90%
Precious Metals                                                                      .75%
U.S. Government Bond                                                                 .50%
Juno                                                                                 .90%
U.S. Government Money Market                                                         .50%
</TABLE>
 
    The Advisor bears all of its own costs associated with providing these
advisory services and the expenses of the Trustees who are affiliated with the
Advisor. The Advisor may make payments from its own resources to broker-dealers
and other financial institutions in connection with the sale of Fund shares.
 
    The portfolio manager of the Ursa Fund, OTC Fund and the Arktos Fund is
Michael P. Byrum, who is the Advisor's senior portfolio manager. Prior to
joining the Advisor as a portfolio manager in July 1993, Mr. Byrum worked as an
investor representative with MMA.
 
    The portfolio manager of the Nova Fund and the Juno Fund is Thomas Michael,
who joined the Advisor as a portfolio manager in March 1994. From 1992 to
February 1994, Mr. Michael was a financial markets analyst at Cedar Street
Investment Management Co., of Chicago, Illinois, an institutional consulting
firm specializing in developing hedging and speculative strategies in stock
index futures contracts and U.S. Treasury bond futures contracts.
 
    The portfolio manager of the Precious Metals Fund is T. Daniel Gillespie,
who joined the Advisor as a portfolio manager in January 1997. From July 1994 to
January 1997, Mr. Gillespie was a portfolio manager for GIT Investment Funds, a
registered investment company in Arlington, Virginia, where Mr. Gillespie
managed over $160 million in equity, bond, and money market mutual fund assets.
From 1991 to 1994, Mr. Gillespie worked as a portfolio manager to The Rushmore
Funds, Inc., in Bethesda, Maryland, a registered investment company, where Mr.
Gillespie managed over $900 million in mutual fund assets.
 
    The portfolio manager of the U.S. Government Bond Fund is Anne H. Ruff, who
joined the Advisor as a portfolio manager in August 1996. From 1989 to 1995, Ms.
Ruff worked as a portfolio manager for United Services Life Insurance Company in
Arlington, Virginia, where Ms. Ruff managed $2.5 billion in fixed-income
portfolios.
<PAGE>
- ------
28  PROSPECTUS
 
                       DIVIDENDS, DISTRIBUTIONS AND TAXES
 
DIVIDENDS AND DISTRIBUTIONS
 
    Income dividends, if any, are paid at least annually by each of the Funds,
except the U.S. Government Money Market and Bond Funds, which declare dividends
daily and pay them monthly. If you own Fund shares on a Fund's record date, you
will be entitled to receive the dividend. The Funds may declare and pay
dividends on the same date. The Funds make distributions of capital gains at
least annually. The Trust, however, may declare a special capital gains
distribution if the Trustees believe that such a distribution would be in the
best interest of the shareholders of a Fund.
 
    You will receive dividends and distributions in the form of additional Fund
shares unless you have elected to receive payment in cash. If you have not
already elected to receive cash payments on your application, you must notify
the Trust in writing prior to the date of distribution. Your election will
become effective for dividends paid after the Trust receives your written
notice. To cancel your election, simply send written notice to the Trust.
 
    Dividends and distributions from a Fund are taxable to you whether they are
reinvested in additional shares of the Fund or are received in cash. You will
receive an account statement at least quarterly.
 
TAX INFORMATION
 
    The following is a summary of some important tax issues that affect the
Funds and their shareholders. The summary is based on current tax laws, which
may be changed by legislative, judicial or administrative action. We have not
tried to present a detailed explanation of the tax treatment of the Funds, or of
the tax consequences of an investment in the Funds. MORE INFORMATION ABOUT TAXES
IS LOCATED IN THE SAI. WE URGE YOU TO CONSULT YOUR TAX ADVISOR REGARDING
SPECIFIC QUESTIONS AS TO FEDERAL, STATE AND LOCAL INCOME TAXES.
 
TAX STATUS OF EACH FUND
 
    Each Fund is treated as a separate entity for federal tax purposes, and
intends to qualify for the special tax treatment afforded regulated investment
companies. As long as a Fund qualifies as a regulated investment company, it
pays no federal income tax on the earnings it distributes to Shareholders.
 
TAX STATUS OF DISTRIBUTIONS
 
    - Each Fund will distribute substantially all of its income. THE INCOME
      DIVIDENDS YOU RECEIVE FROM THE FUNDS WILL BE TAXED AS ORDINARY INCOME
      WHETHER YOU RECEIVE THE DIVIDENDS IN CASH OR IN ADDITIONAL SHARES.
<PAGE>
                                                            PROSPECTUS  29
                                                                        --------
 
    - Corporate shareholders may be entitled to a dividends-received deduction
      for the portion of dividends they receive which are attributable to
      dividends received by a Fund from U.S. corporations.
 
    - Capital gains distributions will result from gains on the sale or exchange
      of capital assets held for more than one year, and will be taxed at
      different rates depending on how long the Fund held the assets.
 
    - Distributions paid in January but declared by a Fund in October, November
      or December of the previous year, may be taxable to you in the previous
      year.
 
TAX STATUS OF SHARE TRANSACTIONS
 
    EACH SALE, EXCHANGE, OR REDEMPTION OF FUND SHARES IS A TAXABLE EVENT TO YOU.
YOU SHOULD CONSIDER THE TAX CONSEQUENCES OF ANY REDEMPTION OR EXCHANGE BEFORE
MAKING SUCH A REQUEST, ESPECIALLY WITH RESPECT TO REDEMPTIONS, IF YOU INVEST IN
THE FUNDS THROUGH A TAX-QUALIFIED RETIREMENT PLAN.
 
STATE TAX CONSIDERATIONS
 
    A Fund is not liable for any income or franchise tax in Delaware as long as
it qualifies as a regulated investment company for Federal income tax purposes.
 
    Distributions by the Funds may be subject to state and local taxation. You
should verify your tax liability with your tax advisor.
<PAGE>
- ------
30  PROSPECTUS
 
                              FINANCIAL HIGHLIGHTS
                                   NOVA FUND
 
(FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)
 
[LOGO]
       The financial highlights table is intended to help you understand the
       Fund's financial performance for the period of the Fund's operations.
       Certain information reflects financial results for a single Nova 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 Deloitte & Touche LLP, whose report, along with the financial
statements and related notes, appears in the Trust's 1998 Annual Report. Our
1998 Annual Report is available by telephoning us at 800-820-0888 or (301)
468-8520. The Annual Report is incorporated by reference in the SAI.
 
<TABLE>
<CAPTION>
                                                                     YEAR       PERIOD          YEAR      YEAR      PERIOD
                                                                     ENDED       ENDED         ENDED     ENDED      ENDED
                                                                   MARCH 31,   MARCH 31,      JUNE 30,  JUNE 30,   JUNE 30,
                                                                     1998        1997*          1996      1995      1994**
                                                                   ---------   ---------      --------  --------   --------
<S>                                                                <C>         <C>            <C>       <C>        <C>
Per Share Operating Performance:+
Net Asset Value -- Beginning of Period...........................  $  17.89    $  15.68       $  11.81  $  9.77    $ 10.01
                                                                   ---------   ---------      --------  --------   --------
  Net Investment Income (Loss)...................................       .59         .35            .56      .28        .01
  Net Realized and Unrealized Gains (Losses) on Securities.......     11.39        2.19           3.31     2.88       (.25)
                                                                   ---------   ---------      --------  --------   --------
  Net Increase (Decrease) in Net Asset Value Resulting from
   Operations....................................................     11.98        2.54           3.87     3.16       (.24)
  Dividends to Shareholders from Net Investment Income...........       .00         .00            .00     (.29)       .00
  Distributions to Shareholders from Net Realized Capital Gain...      (.05)       (.33)           .00     (.83)       .00
                                                                   ---------   ---------      --------  --------   --------
Net Increase (Decrease) in Net Asset Value.......................     11.93        2.21           3.87     2.04       (.24)
                                                                   ---------   ---------      --------  --------   --------
Net Asset Value -- End of Period.................................  $  29.82    $  17.89       $  15.68  $ 11.81    $  9.77
                                                                   ---------   ---------      --------  --------   --------
                                                                   ---------   ---------      --------  --------   --------
Total Investment Return..........................................     67.02%      20.92%***      32.77%   32.65%     (2.47)%
Ratios to Average Net Assets
  Gross Expenses.................................................      1.13%       1.19%***
  Net Expenses...................................................      1.11%       1.16%***       1.31%    1.43%      1.73%***
  Net Investment Income (Loss)...................................      2.42%       2.69%***       3.14%    2.62%      1.05%***
Supplementary Data
  Portfolio Turnover Rate****....................................         0%          0%             0%       0%         0%
  Net Assets, End of Period (000's omitted)......................  $986,247    $181,930       $224,541  $62,916    $77,914
</TABLE>
 
- ------------
 
+     THE PER SHARE DATA OF THE FINANCIAL HIGHLIGHTS TABLE IS CALCULATED USING
     THE DAILY SHARES OUTSTANDING AVERAGE FOR THE YEAR.
 
*     ON MARCH 12, 1997, THE TRUSTEES CHANGED THE TRUST'S FISCAL YEAR END FROM
     JUNE 30 TO MARCH 31.
 
**    COMMENCEMENT OF OPERATIONS: JULY 12, 1993.
 
***    ANNUALIZED.
 
****   PORTFOLIO TURNOVER RATIO IS CALCULATED WITHOUT REGARD TO SECURITIES
     HAVING A MATURITY OF LESS THAN ONE YEAR. THE NOVA FUND TYPICALLY HOLDS MOST
     OF ITS INVESTMENTS IN OPTIONS AND FUTURES CONTRACTS, WHICH ARE DEEMED
     SHORT-TERM SECURITIES.
<PAGE>
                                                            PROSPECTUS  31
                                                                        --------
 
                              FINANCIAL HIGHLIGHTS
                                   URSA FUND
 
(FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)
 
[LOGO]
       The financial highlights table is intended to help you understand the
       Fund's financial performance for the period of the Fund's operations.
       Certain information reflects financial results for a single Ursa 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 Deloitte & Touche LLP, whose report, along with the financial
statements and related notes, appears in the Trust's 1998 Annual Report. Our
1998 Annual Report is available by telephoning us at 800-820-0888 or (301)
468-8520. The Annual Report is incorporated by reference in the SAI.
 
<TABLE>
<CAPTION>
                                                                     YEAR       PERIOD          YEAR       YEAR       PERIOD
                                                                     ENDED       ENDED         ENDED       ENDED       ENDED
                                                                   MARCH 31,   MARCH 31,      JUNE 30,   JUNE 30,    JUNE 30,
                                                                     1998        1997*          1996       1995       1994**
                                                                   ---------   ---------      --------   ---------   ---------
<S>                                                                <C>         <C>            <C>        <C>         <C>
Per Share Operating Performance:+
Net Asset Value -- Beginning of Period...........................  $   7.02    $   7.55       $   8.79   $   10.54   $   10.00
                                                                   ---------   ---------      --------   ---------   ---------
  Net Investment Income (Loss)...................................       .19         .17            .30         .35         .01
  Net Realized and Unrealized Gains (Losses) on Securities.......     (2.23)       (.68)         (1.54)      (1.78)        .53
                                                                   ---------   ---------      --------   ---------   ---------
  Net Increase (Decrease) in Net Asset Value Resulting from
   Operations....................................................     (2.04)       (.51)         (1.24)      (1.43)        .54
  Dividends to Shareholders from Net Investment Income...........      (.02)       (.02)           .00        (.32)        .00
                                                                   ---------   ---------      --------   ---------   ---------
Net Increase (Decrease) in Net Asset Value.......................     (2.06)       (.53)         (1.24)      (1.75)        .54
                                                                   ---------   ---------      --------   ---------   ---------
Net Asset Value -- End of Period.................................  $   4.96    $   7.02       $   7.55   $    8.79   $   10.54
                                                                   ---------   ---------      --------   ---------   ---------
                                                                   ---------   ---------      --------   ---------   ---------
Total Investment Return..........................................    (29.06)%     (8.98)%***    (14.11)%    (14.08)%     10.89%
Ratios to Average Net Assets
  Gross Expenses.................................................      1.36%       1.36%***
  Net Expenses...................................................      1.34%       1.34%***       1.39%       1.39%       1.67%***
  Net Investment Income (Loss)...................................      3.18%       3.21%***       3.38%       3.50%       1.43%***
Supplementary Data
  Portfolio Turnover Rate****....................................         0%          0%             0%          0%          0%
  Net Assets, End of Period (000's omitted)......................  $254,225    $582,288       $192,553   $ 127,629   $ 110,899
</TABLE>
 
- ------------
 
+     THE PER SHARE DATA OF THE FINANCIAL HIGHLIGHTS TABLE IS CALCULATED USING
     THE DAILY SHARES OUTSTANDING AVERAGE FOR THE YEAR.
 
*     ON MARCH 12, 1997, THE TRUSTEES CHANGED THE TRUST'S FISCAL YEAR END FROM
     JUNE 30 TO MARCH 31.
 
**    COMMENCEMENT OF OPERATIONS: JANUARY 7, 1994.
 
***    ANNUALIZED.
 
****   PORTFOLIO TURNOVER RATIO IS CALCULATED WITHOUT REGARD TO SECURITIES
     HAVING A MATURITY OF LESS THAN ONE YEAR. THE URSA FUND TYPICALLY HOLDS MOST
     OF ITS INVESTMENTS IN OPTIONS AND FUTURES CONTRACTS, WHICH ARE DEEMED
     SHORT-TERM SECURITIES.
<PAGE>
- -------
  32  PROSPECTUS
 
                              FINANCIAL HIGHLIGHTS
                                    OTC FUND
 
(FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)
 
[LOGO]
       The financial highlights table is intended to help you understand the
       Fund's financial performance for the period of the Fund's operations.
       Certain information reflects financial results for a single OTC 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 Deloitte & Touche LLP, whose report, along with the financial
statements and related notes, appears in the Trust's 1998 Annual Report. Our
1998 Annual Report is available by telephoning us at 800-820-0888 or (301)
468-8520. The Annual Report is incorporated by reference in the SAI.
 
<TABLE>
<CAPTION>
                                                                     YEAR       PERIOD          YEAR        YEAR       PERIOD
                                                                     ENDED       ENDED          ENDED       ENDED       ENDED
                                                                   MARCH 31,   MARCH 31,      JUNE 30,    JUNE 30,    JUNE 30,
                                                                     1998        1997*          1996        1995       1994**
                                                                   ---------   ---------      ---------   ---------   ---------
<S>                                                                <C>         <C>            <C>         <C>         <C>
Per Share Operating Performance:+
Net Asset Value -- Beginning of Period...........................  $  17.93    $  15.16       $   12.22   $    8.76   $   10.00
                                                                   ---------   ---------      ---------   ---------   ---------
  Net Investment Income (Loss)...................................      (.14)        .01             .06         .14         .01
  Net Realized and Unrealized Gains (Losses) on Securities.......      9.99        2.84            3.24        4.17       (1.25)
                                                                   ---------   ---------      ---------   ---------   ---------
  Net Increase (Decrease) in Net Asset Value Resulting from
   Operations....................................................      9.85        2.85            3.30        4.31       (1.24)
  Dividends to Shareholders from Net Investment Income...........       .00        (.07)            .00        (.12)        .00
Distributions to Shareholders from Net Realized Capital Gain.....      (.10)       (.01)           (.36)       (.73)        .00
                                                                   ---------   ---------      ---------   ---------   ---------
Net Increase (Decrease) in Net Asset Value.......................      9.75        2.77            2.94        3.46       (1.24)
                                                                   ---------   ---------      ---------   ---------   ---------
Net Asset Value -- End of Period.................................  $  27.68    $  17.93       $   15.16   $   12.22   $    8.76
                                                                   ---------   ---------      ---------   ---------   ---------
                                                                   ---------   ---------      ---------   ---------   ---------
Total Investment Return..........................................     55.05%      24.77%***       26.44%      49.00%     (30.17)%
Ratios to Average Net Assets
  Gross Expenses.................................................      1.13%       1.27%***
  Net Expenses...................................................      1.13%       1.27%***        1.33%       1.41%       1.97%***
  Net Investment Income (Loss)...................................      (.58)%       .08%***         .44%       1.34%       1.69%***
Supplementary Data
  Portfolio Turnover Rate****....................................    971.80%   1,140.35%       2,578.56%   2,241.00%   1,171.00%
  Net Assets, End of Period (000's omitted)......................  $449,794    $ 52,278       $  48,716   $  61,948   $  30,695
</TABLE>
 
- ------------
 
+     THE PER SHARE DATA OF THE FINANCIAL HIGHLIGHTS TABLE IS CALCULATED USING
     THE DAILY SHARES OUTSTANDING AVERAGE FOR THE YEAR.
 
*     ON MARCH 12, 1997, THE TRUSTEES CHANGED THE TRUST'S FISCAL YEAR END FROM
     JUNE 30 TO MARCH 31.
 
**    COMMENCEMENT OF OPERATIONS: FEBRUARY 14, 1994.
 
***    ANNUALIZED.
 
****   PORTFOLIO TURNOVER RATIO IS CALCULATED WITHOUT REGARD TO SECURITIES
     HAVING A MATURITY OF LESS THAN ONE YEAR.
<PAGE>
                                                            PROSPECTUS  33
                                                                        --------
 
                              FINANCIAL HIGHLIGHTS
                              PRECIOUS METALS FUND
 
(FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)
 
[LOGO]
       The financial highlights table is intended to help you understand the
       Fund's financial performance for the period of the Fund's operations.
       Certain information reflects financial results for a single Precious
       Metals 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 Deloitte & Touche LLP, whose report,
along with the financial statements and related notes, appears in the Trust's
1998 Annual Report. Our 1998 Annual Report is available by telephoning us at
800-820-0888 or (301) 468-8520. The Annual Report is incorporated by reference
in the SAI.
 
<TABLE>
<CAPTION>
                                                                     YEAR       PERIOD          YEAR        YEAR       PERIOD
                                                                     ENDED       ENDED          ENDED       ENDED       ENDED
                                                                   MARCH 31,   MARCH 31,      JUNE 30,    JUNE 30,    JUNE 30,
                                                                     1998        1997*          1996        1995       1994**
                                                                   ---------   ---------      ---------   ---------   ---------
<S>                                                                <C>         <C>            <C>         <C>         <C>
Per Share Operating Performance:+
Net Asset Value -- Beginning of Period...........................  $   7.64    $   9.05       $    8.73   $    8.29   $   10.00
                                                                   ---------   ---------      ---------   ---------   ---------
  Net Investment Income (Loss)...................................       .00         .00             .00         .10         .01
  Net Realized and Unrealized Gains (Losses) on Securities.......     (1.82)      (1.41)            .32         .43       (1.72)
                                                                   ---------   ---------      ---------   ---------   ---------
  Net Increase (Decrease) in Net Asset Value Resulting from
   Operations....................................................     (1.82)      (1.41)            .32         .53       (1.71)
  Dividends to Shareholders from Net Investment Income...........       .00         .00             .00        (.09)        .00
                                                                   ---------   ---------      ---------   ---------   ---------
Net Increase (Decrease) in Net Asset Value.......................     (1.82)      (1.41)            .32         .44       (1.71)
                                                                   ---------   ---------      ---------   ---------   ---------
Net Asset Value -- End of Period.................................  $   5.82    $   7.64       $    9.05   $    8.73   $    8.29
                                                                   ---------   ---------      ---------   ---------   ---------
                                                                   ---------   ---------      ---------   ---------   ---------
Total Investment Return..........................................    (23.82)%    (20.77)%***       3.67%       6.21%     (29.27)%
Ratios to Average Net Assets
  Gross Expenses.................................................      1.42%       1.49%***
  Net Expenses...................................................      1.41%       1.45%***        1.33%       1.38%       2.06%***
  Net Investment Income (Loss)...................................       .05%        .00%***        (.01)%      1.15%       1.23%***
Supplementary Data
  Portfolio Turnover Rate****....................................    752.05%     743.33%       1,036.37%   1,765.00%   2,728.00%
  Average Commission Rate Paid****...............................     .0140       .0101           .0151          --          --
Net Assets, End of Period (000's omitted)........................  $ 34,538    $ 23,680       $  36,574   $  40,861   $   1,526
</TABLE>
 
- ------------
 
+     THE PER SHARE DATA OF THE FINANCIAL HIGHLIGHTS TABLE IS CALCULATED USING
     THE DAILY SHARES OUTSTANDING AVERAGE FOR THE YEAR.
 
*     ON MARCH 12, 1997, THE TRUSTEES CHANGED THE TRUST'S FISCAL YEAR END FROM
     JUNE 30 TO MARCH 31.
 
**    COMMENCEMENT OF OPERATIONS: DECEMBER 1, 1993.
 
***    ANNUALIZED.
 
****   PORTFOLIO TURNOVER RATIO IS CALCULATED WITHOUT REGARD TO SECURITIES
     HAVING A MATURITY OF LESS THAN ONE YEAR.
 
*****  FOR FISCAL YEARS BEGINNING ON OR AFTER SEPTEMBER 1, 1995, THE FUND IS
     REQUIRED TO DISCLOSE ITS AVERAGE COMMISSION RATE PER SHARE FOR PURCHASES
     AND SALES OF EQUITY SECURITIES.
<PAGE>
- ------
34  PROSPECTUS
 
                              FINANCIAL HIGHLIGHTS
                           U.S. GOVERNMENT BOND FUND
 
(FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)
 
[LOGO]
       The financial highlights table is intended to help you understand the
       Fund's financial performance for the period of the Fund's operations.
       Certain information reflects financial results for a single U.S.
       Government Bond 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 Deloitte & Touche LLP, whose report, along with
the financial statements and related notes, appears in the Trust's 1998 Annual
Report. Our 1998 Annual Report is available by telephoning us at 800-820-0888 or
(301) 468-8520. The Annual Report is incorporated by reference in the SAI.
 
<TABLE>
<CAPTION>
                                                                  YEAR       PERIOD          YEAR       YEAR       PERIOD
                                                                  ENDED       ENDED         ENDED       ENDED       ENDED
                                                                MARCH 31,   MARCH 31,      JUNE 30,   JUNE 30,    JUNE 30,
                                                                  1998        1997*          1996       1995       1994**
                                                                ---------   ---------      --------   ---------   ---------
<S>                                                             <C>         <C>            <C>        <C>         <C>
Per Share Operating Performance:+
Net Asset Value -- Beginning of Period........................  $   8.52     $  8.97       $  9.55    $    8.24   $   10.00
                                                                ---------   ---------      --------   ---------   ---------
  Net Investment Income (Loss)................................       .45         .34           .46          .39         .02
  Net Realized and Unrealized Gains (Losses) on Securities....      1.50        (.45)         (.45)        1.17       (1.76)
                                                                ---------   ---------      --------   ---------   ---------
  Net Increase (Decrease) in Net Asset Value Resulting from
   Operations.................................................      1.95        (.11)          .01         1.56       (1.74)
  Dividends to Shareholders from Net Investment Income........      (.43)       (.34)         (.46)        (.25)       (.02)
  Distributions to Shareholders from Net Realized Capital
   Gain.......................................................       .00         .00          (.13)         .00         .00
                                                                ---------   ---------      --------   ---------   ---------
Net Increase (Decrease) in Net Asset Value....................      1.52        (.45)         (.58)        1.31       (1.76)
                                                                ---------   ---------      --------   ---------   ---------
Net Asset Value -- End of Period..............................  $  10.04     $  8.52       $  8.97    $    9.55   $    8.24
                                                                ---------   ---------      --------   ---------   ---------
                                                                ---------   ---------      --------   ---------   ---------
Total Investment Return.......................................     24.72%       (.46)%***    (1.48)%      18.97%     (32.63)%
Ratios to Average Net Assets
  Gross Expenses..............................................      1.13%       1.51%***
  Net Expenses................................................      1.11%       1.49%***      1.26%        2.26%       3.05%***
  Net Investment Income (Loss)................................      4.65%       5.06%***      4.73%        4.64%       3.39%***
Supplementary Data
  Portfolio Turnover Rate****.................................  1,496.21%     962.17%       780.30%    3,452.59%   1,290.00%
  Net Assets, End of Period (000's omitted)...................  $ 20,508     $ 3,302       $18,331    $   2,592   $   1,564
</TABLE>
 
- ------------
 
+     THE PER SHARE DATA OF THE FINANCIAL HIGHLIGHTS TABLE IS CALCULATED USING
     THE DAILY SHARES OUTSTANDING AVERAGE FOR THE YEAR.
 
*     ON MARCH 12, 1997, THE TRUSTEES CHANGED THE TRUST'S FISCAL YEAR END FROM
     JUNE 30 TO MARCH 31.
 
**    COMMENCEMENT OF OPERATIONS: JANUARY 3, 1994.
 
***    ANNUALIZED.
 
****   PORTFOLIO TURNOVER RATIO IS CALCULATED WITHOUT REGARD TO SECURITIES
     HAVING A MATURITY OF LESS THAN ONE YEAR.
<PAGE>
                                                            PROSPECTUS  35
                                                                        --------
 
                              FINANCIAL HIGHLIGHTS
                                   JUNO FUND
 
(FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)
 
[LOGO]
       The financial highlights table is intended to help you understand the
       Fund's financial performance for the period of the Fund's operations.
       Certain information reflects financial results for a single Juno 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 Deloitte & Touche LLP, whose report, along with the financial
statements and related notes, appears in the Trust's 1998 Annual Report. Our
1998 Annual Report is available by telephoning us at 800-820-0888 or (301)
468-8520. The Annual Report is incorporated by reference in the SAI.
 
<TABLE>
<CAPTION>
                                                                     YEAR       PERIOD          YEAR        YEAR
                                                                     ENDED       ENDED          ENDED      ENDED
                                                                   MARCH 31,   MARCH 31,      JUNE 30,    JUNE 30,
                                                                     1998        1997*          1996       1995**
                                                                   ---------   ---------      ---------   --------
<S>                                                                <C>         <C>            <C>         <C>
Per Share Operating Performance:+
Net Asset Value -- Beginning of Period...........................  $   9.69    $   9.47       $    9.08   $  10.00
                                                                   ---------   ---------      ---------   --------
  Net Investment Income (Loss)...................................       .16         .25             .34        .14
  Net Realized and Unrealized Gains (Losses) on Securities            (1.12)        .00             .05      (1.06)
                                                                   ---------   ---------      ---------   --------
  Net Increase (Decrease) in Net Asset Value Resulting from
   Operations                                                          (.96)        .25             .39       (.92)
  Dividends to Shareholders from Net Investment Income                 (.08)       (.03)            .00        .00
  Net Increase (Decrease) in Net Asset Value                          (1.04)        .22             .39       (.92)
                                                                   ---------   ---------      ---------   --------
Net Asset Value -- End of Period                                   $   8.65    $   9.69       $    9.47   $   9.08
                                                                   ---------   ---------      ---------   --------
                                                                   ---------   ---------      ---------   --------
Total Investment Return..........................................     (9.92)%      3.75%***        4.30%     (9.20)%
Ratios to Average Net Assets
  Gross Expenses.................................................      1.61%       1.60%***
  Net Expenses...................................................      1.59%       1.58%***        1.64%      1.50%***
  Net Investment Income (Loss)...................................      3.55%       3.51%***        3.63%      1.32%***
Supplementary Data
  Portfolio Turnover Rate****....................................        0%          0%              0%         0%
  Net Assets, End of Period (000's omitted)......................  $ 12,887    $ 32,577       $  18,860   $  4,301
</TABLE>
 
- ------------
 
+     THE PER SHARE DATA OF THE FINANCIAL HIGHLIGHTS TABLE IS CALCULATED USING
     THE DAILY SHARES OUTSTANDING AVERAGE FOR THE YEAR.
 
*     ON MARCH 12, 1997, THE TRUSTEES CHANGED THE TRUST'S FISCAL YEAR END FROM
     JUNE 30 TO MARCH 31.
 
**    COMMENCEMENT OF OPERATIONS: MARCH 3, 1995.
 
***    ANNUALIZED.
 
****   PORTFOLIO TURNOVER RATIO IS CALCULATED WITHOUT REGARD TO SECURITIES
     HAVING A MATURITY OF LESS THAN ONE YEAR. THE JUNO FUND TYPICALLY HOLDS MOST
     OF ITS INVESTMENTS IN OPTIONS AND FUTURES CONTRACTS, WHICH ARE DEEMED
     SHORT-TERM SECURITIES.
<PAGE>
- ------
36  PROSPECTUS
 
                              FINANCIAL HIGHLIGHTS
                       U.S. GOVERNMENT MONEY MARKET FUND
 
(FOR A SHARE OUTSTANDING THROUGHOUT EACH PERIOD)
 
[LOGO]
       The financial highlights table is intended to help you understand the
       Fund's financial performance for the period of the Fund's operations.
       Certain information reflects financial results for a single U.S.
       Government Money Market 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 Deloitte & Touche
LLP, whose report, along with the financial statements and related notes,
appears in the Trust's 1998 Annual Report. Our 1998 Annual Report is available
by telephoning us at 800-820-0888 or (301) 468-8520. The Annual Report is
incorporated by reference in the SAI.
 
<TABLE>
<CAPTION>
                                                                     YEAR       PERIOD          YEAR        YEAR       PERIOD
                                                                     ENDED       ENDED          ENDED       ENDED      ENDED
                                                                   MARCH 31,   MARCH 31,      JUNE 30,    JUNE 30,    JUNE 30,
                                                                     1998        1997*          1996        1995       1994**
                                                                   ---------   ---------      ---------   ---------   --------
<S>                                                                <C>         <C>            <C>         <C>         <C>
Per Share Operating Performance:+
Net Asset Value -- Beginning of Period...........................  $   1.00    $   1.00       $    1.00   $    1.00   $  1.00
                                                                   ---------   ---------      ---------   ---------   --------
  Net Investment Income (Loss)...................................       .04         .03             .04         .04       .01
                                                                   ---------   ---------      ---------   ---------   --------
  Net Increase in Net Asset Value Resulting from Operations......       .04         .03             .04         .04       .01
  Dividends to Shareholders from Net Investment Income...........      (.04)       (.03)           (.04)       (.04)     (.01)
                                                                   ---------   ---------      ---------   ---------   --------
Net Increase in Net asset Value..................................       .00         .00             .00         .00       .00
                                                                   ---------   ---------      ---------   ---------   --------
Net Asset Value -- End of Period.................................  $   1.00    $   1.00       $    1.00   $    1.00   $  1.00
                                                                   ---------   ---------      ---------   ---------   --------
                                                                   ---------   ---------      ---------   ---------   --------
Total Investment Return..........................................      4.69%       4.39%***        4.60%       4.43%     2.47%
Ratios to Average Net Assets
  Gross Expenses.................................................       .89%        .86%***
  Net Expenses...................................................       .89%        .86%***         .99%        .89%     1.16%***
  Net Investment Income (Loss)...................................      4.37%       4.06%***        4.18%       4.23%     2.34%***
Supplementary Data
  Portfolio Turnover Rate****....................................         0%          0%              0%          0%        0%
  Net Assets, End of Period (000's omitted)......................  $253,295    $283,553       $ 153,925   $ 284,198   $88,107
</TABLE>
 
- ------------
 
+     THE PER SHARE DATA OF THE FINANCIAL HIGHLIGHTS TABLE IS CALCULATED USING
     THE DAILY SHARES OUTSTANDING AVERAGE FOR THE YEAR.
 
*     ON MARCH 12, 1997, THE TRUSTEES CHANGED THE TRUST'S FISCAL YEAR END FROM
     JUNE 30 TO MARCH 31.
 
**    COMMENCEMENT OF OPERATIONS: DECEMBER 3, 1993.
 
***    ANNUALIZED.
 
****   PORTFOLIO TURNOVER RATE IS CALCULATED WITHOUT REGARD TO SHORT-TERM
     SECURITIES HAVING A MATURITY OF LESS THAN ONE YEAR.
<PAGE>
                                                            PROSPECTUS  37
                                                                        --------
 
BENCHMARK INFORMATION.
 
NEITHER THE NOVA FUND NOR THE URSA FUND IS SPONSORED, ENDORSED, SOLD, OR
PROMOTED BY STANDARD & POOR'S CORP. (S&P); NEITHER THE OTC FUND NOR THE ARKTOS
FUND IS SPONSORED, ENDORSED, SOLD, OR PROMOTED BY NASDAQ OR ANY OF NASDAQ'S
AFFILIATES (NASDAQ AND ITS AFFILIATES HEREINAFTER COLLECTIVELY REFERRED TO AS
"NASDAQ"); AND THE METALS FUND IS NOT SPONSORED, ENDORSED, SOLD, OR PROMOTED BY
THE PHILADELPHIA STOCK EXCHANGE (PHLX), SPONSOR OF THE XAU INDEX.
 
NONE OF S&P, NASDAQ, AND PHLX MAKE ANY REPRESENTATION OR WARRANTY, IMPLIED OR
EXPRESS, TO THE INVESTORS IN THE FUNDS, OR ANY MEMBER OF THE PUBLIC, REGARDING
THE ADVISABILITY OF INVESTING IN INDEX FUNDS OR THE ABILITY OF THE S&P 500
INDEX, NASDAQ 100 INDEX-TM-, AND THE XAU INDEX, RESPECTIVELY, TO TRACK GENERAL
STOCK MARKET PERFORMANCE.
 
NONE OF S&P, NASDAQ, AND PHLX GUARANTEES THE ACCURACY AND/OR THE COMPLETENESS OF
THE S&P 500 INDEX, NASDAQ 100 INDEX-TM-, AND THE XAU INDEX, RESPECTIVELY, OR ANY
DATA INCLUDED THEREIN.
 
NONE OF S&P, NASDAQ, AND PHLX MAKE ANY WARRANTY, EXPRESS OR IMPLIED, AS TO
RESULTS TO BE OBTAINED BY ANY OF THE FUNDS, THE INVESTORS IN THE FUNDS, OR ANY
PERSON OR ENTITY FROM THE USE OF THE S&P 500 INDEX, THE NASDAQ 100 INDEX-TM-,
THE XAU INDEX, RESPECTIVELY, OR ANY DATA INCLUDED THEREIN.
 
NONE OF S&P, NASDAQ, AND PHLX MAKE ANY EXPRESS OR IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE FOR USE WITH RESPECT TO THE
S&P 500 INDEX, THE NASDAQ 100 INDEX-TM-, THE XAU INDEX, RESPECTIVELY, OR ANY
DATA INCLUDED THEREIN.
<PAGE>
Additional information about the Funds is included in a Statement of Additional
   Information dated August 1, 1998 (the "SAI"), which contains more detailed
  information about the Funds. The SAI has been filed with the Securities and
     Exchange Commission ("SEC") and is incorporated by reference into this
  Prospectus and, therefore, legally forms a part of this Prospectus. The SEC
  maintains a Web site ("http://www.sec.gov") that contains the SAI, material
incorporated by reference, and other information regarding registrants that file
 electronically with the SEC. You may also review and copy documents at the SEC
Public Reference Room in Washington, D.C. (for information call 1-800-SEC-0330).
 You may request documents by mail from the SEC, upon payment of a duplication
    fee, by writing to: Securities and Exchange Commission, Public Reference
     Section, Washington, D.C. 20549-6009. To help you to obtain additional
          information, the Fund's SEC registration number is 811-7584.
 
 You may obtain a copy of the SAI or the annual or semi-annual reports, without
 charge by calling 1-800-820-0888 or by writing to Rydex Series Trust, at 6116
     Executive Boulevard, Suite 400, Rockville, Maryland 20852. Additional
 information about the Funds' investments is available in the annual and semi-
annual reports. Also, in the Funds' annual report, you will find a discussion of
the market conditions and investment strategies that significantly affected the
                Funds' performance during its last fiscal year.
 
- --------------------------------------------------------------------------------
 
       NO ONE HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
   REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS OR IN THE TRUST'S SAI IN
CONNECTION WITH THE OFFERING OF FUND SHARES. DO NOT RELY ON ANY SUCH INFORMATION
  OR REPRESENTATIONS AS HAVING BEEN AUTHORIZED BY THE TRUST OR PADCO ADVISORS,
    INC. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE TRUST IN ANY
               JURISDICTION WHERE SUCH AN OFFERING IS NOT LAWFUL.


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