VANGUARD MONEY MARKET RESERVES INC
485BPOS, 1995-03-10
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                   FORM N-1A
                   REGISTRATION STATEMENT (NO. 2-52698) UNDER
                           THE SECURITIES ACT OF 1933
                       PRE-EFFECTIVE AMENDMENT NO.    /X/
   
                      POST-EFFECTIVE AMENDMENT NO. 44 /X/
    
                                      AND
 
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                  ACT OF 1940
 
   
                             AMENDMENT NO. 46 /X/

                      VANGUARD MONEY MARKET RESERVES, INC.
    
               (EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)
 
                     P.O. BOX 2600, VALLEY FORGE, PA 19482
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE)
 
                  REGISTRANT'S TELEPHONE NUMBER (610) 669-1000
 
                         RAYMOND J. KLAPINSKY, ESQUIRE
                                  P.O. BOX 876
                             VALLEY FORGE, PA 19482
 
              IT IS PROPOSED THAT THIS AMENDMENT BECOME EFFECTIVE:
   
 on March 17, 1995, pursuant to paragraph (b) of Rule 485 of the Securities Act
                                    of 1933.
    
 
                 APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING:
  As soon as practicable after this Registration Statement becomes effective.
 
   
     REGISTRANT ELECTS TO REGISTER AN INDEFINITE NUMBER OF SHARES PURSUANT TO
REGULATION 24F-2 UNDER THE INVESTMENT COMPANY ACT OF 1940. REGISTRANT FILED ITS
RULE 24F-2 NOTICE FOR THE PERIOD ENDED NOVEMBER 30, 1994 ON JANUARY 30, 1995.
    
 
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<PAGE>   2
 
                      VANGUARD MONEY MARKET RESERVES, INC.
 
                             CROSS REFERENCE SHEET
<TABLE>
<CAPTION>
FORM N-1A
ITEM NUMBER                                                    LOCATION IN PROSPECTUS
<C>           <S>                                              <C>
    Item 1.   Cover Page....................................   Cover Page
    Item 2.   Synopsis......................................   Highlights
    Item 3.   Condensed Financial Information...............   Financial Highlights
    Item 4.   General Description of Registrant.............   Investment Objective; Investment
                                                               Limitations; Investment Policies;
                                                               General Information
    Item 5.   Management of the Fund........................   Directors and Officers; Management of
                                                               the Fund; The Vanguard Group
    Item 6.   Capital Stock and Other Securities............   Opening an Account and Purchasing
                                                               Shares; Selling Your Shares; The
                                                               Share Price of Each Portfolio;
                                                               Dividends and Taxes; General
                                                               Information
    Item 7.   Purchase of Securities Being Offered..........   Cover Page; Opening an Account and
                                                               Purchasing Shares
    Item 8.   Redemption or Repurchase......................   Selling Shares
    Item 9.   Pending Legal Proceedings.....................   Not Applicable
 
<CAPTION>
FORM N-1A                                                      LOCATION IN STATEMENT
ITEM NUMBER                                                    OF ADDITIONAL INFORMATION
<C>           <S>                                              <C>
   Item 10.   Cover Page....................................   Cover Page
   Item 11.   Table of Contents.............................   Cover Page
   Item 12.   General Information and History...............   Investment Objectives and Policies;
                                                               General Information
   Item 13.   Investment Objective and Policies.............   Investment Objectives and Policies;
                                                               Investment Limitations
   Item 14.   Management of the Fund........................   Management of the Fund
   Item 15.   Control Persons and Principal Holders of
              Securities....................................   Management of the Fund
   Item 16.   Investment Advisory and Other Services........   Management of the Fund
   Item 17.   Brokerage Allocation..........................   Not Applicable
   Item 18.   Capital Stock and Other Securities............   Financial Statements
   Item 19.   Purchase, Redemption and Pricing of Securities
              Being Offered.................................   Purchase of Shares; Redemption of
                                                               Shares;
   Item 20.   Tax Status....................................   Appendix
   Item 21.   Underwriters..................................   Not Applicable
   Item 22.   Calculations of Yield Quotations of Money
              Market Fund...................................   Calculation of Yield.
   Item 23.   Financial Statements..........................   Financial Statements
</TABLE>
<PAGE>   3
 
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[LOGO] 
                                                  A Member of The Vanguard Group
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PROSPECTUS--MARCH 17, 1995
    
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NEW ACCOUNT INFORMATION: INVESTOR INFORMATION DEPARTMENT--1-800-662-7447 (SHIP)
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SHAREHOLDER ACCOUNT SERVICES: CLIENT SERVICES DEPARTMENT--1-800-662-2739 (CREW)
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INVESTMENT
OBJECTIVE
AND POLICIES          Vanguard Money Market Reserves, Inc. (the "Fund") is an
                      open-end, diversified investment company known as a money
                      market fund. The Fund offers three separate Portfolios.
                      The objective of each Portfolio is to provide the maximum
                      current income that is consistent with the preservation of
                      capital and liquidity by investing in specified money
                      market instruments. Each Portfolio seeks to maintain, but
                      does not guarantee, a constant net asset value of $1.00
                      per share. ALTHOUGH EACH PORTFOLIO INVESTS IN HIGH-QUALITY
                      INSTRUMENTS, AN INVESTMENT IN THE PORTFOLIOS IS NEITHER
                      INSURED NOR GUARANTEED BY THE U.S. GOVERNMENT AND THERE
                      CAN BE NO ASSURANCE THAT EACH PORTFOLIO WILL BE ABLE TO
                      MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.
    
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OPENING AN
ACCOUNT               To open a regular (non-retirement) account, please
                      complete and return the Account Registration Form. If you
                      need assistance in completing this Form, please call the
                      Investor Information Department. To open an Individual
                      Retirement Account (IRA), please use a Vanguard IRA
                      Adoption Agreement. To obtain a copy of this form, call
                      1-800-662-7447, Monday through Friday, from 8:00 a.m. to
                      9:00 p.m. and Saturday from 9:00 a.m. to 4:00 p.m.
                      (Eastern time). The minimum initial investment is $3,000
                      per Portfolio or $500 for Uniform Gifts/Transfers to
                      Minors Act accounts. The Fund is offered on a no-load
                      basis (i.e., there are no sales commissions or 12b-1
                      fees). However, the Fund incurs expenses for investment
                      advisory, management, administrative and distribution
                      services.
    
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ABOUT THIS
PROSPECTUS            This Prospectus is designed to set forth concisely the
                      information you should know about the Fund before you
                      invest. It should be retained for future reference. A
                      "Statement of Additional Information" containing
                      additional information about the Fund has been filed with
                      the Securities and Exchange Commission. This Statement is
                      dated March 17, 1995, and has been incorporated by
                      reference into this Prospectus. A copy may be obtained
                      without charge by writing to the Fund or by calling the
                      Investor Information Department.
    
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TABLE OF CONTENTS
 
<TABLE>
<S>                                        <C>                                        <C>
                                  Page                                        Page                                       Page
Highlights .......................  2      Implementation of Policies .......   9     SHAREHOLDER GUIDE
Fund Expenses ....................  4      Investment Limitations ...........  10     Opening an Account and
Financial Highlights .............  4      Management of the Fund ...........  10     Purchasing Shares ................  15
Yield and Total Return ...........  6      Investment Adviser ...............  11     When Your Account Will Be
                                           Dividends and Taxes ..............  11     Credited .........................  18 
FUND INFORMATION                           The Share Price of Each                    Selling Your Shares ..............  18 
Investment Objective .............  6      Portfolio ........................  12     Exchanging Your Shares ...........  21
Investment Policies ..............  7      General Information ..............  13     Important Information about
Investment Risks .................  8                                                 Telephone Transactions ...........  22
Who Should Invest ................  9                                                 Transferring
                                                                                      Registration .....................  22
                                                                                      Other Vanguard Services ..........  22
</TABLE>
 
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THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE COMMISSION PASSED UPON THE ACCURACY OR
ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
OFFENSE.
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<PAGE>   4
 
                                   HIGHLIGHTS
 
OBJECTIVE AND
POLICIES
                      Vanguard Money Market Reserves, Inc. (the "Fund") is an
                      open-end, diversified investment company known as a money
                      market fund. The Fund offers three separate Portfolios.
                      The objective of each Portfolio is to provide the maximum
                      current income that is consistent with the preservation of
                      capital and liquidity by investing in specified money
                      market instruments.
 
                      Each Portfolio seeks to maintain a constant net asset
                      value of $1.00 per share. In pursuit of this objective,
                      each Portfolio will invest in securities that mature in
                      less than 13 months, and each Portfolio will maintain an
                      average weighted maturity of 90 days or less.       PAGE 6
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THREE SEPARATE
PORTFOLIOS            Investors may choose from three separate Portfolios, each
                      of which invests in specified money market instruments:
 
   
                      PRIME PORTFOLIO -- invests in high-quality money market
                      obligations issued by financial institutions, nonfinancial
                      corporations, and the U.S. Government, state and municipal
                      governments and their agencies or instrumentalities, as
                      well as repurchase agreements collateralized by such
                      securities. The Prime Portfolio also invests in Eurodollar
                      obligations (dollar-denominated obligations issued outside
                      the U.S. by foreign banks or foreign branches of domestic
                      banks) and Yankee obligations (dollar-denominated
                      obligations issued in the U.S. by foreign banks).
    
 
                      FEDERAL PORTFOLIO -- invests in securities issued by the
                      United States Government or its agencies and
                      instrumentalities, and repurchase agreements
                      collateralized by such securities. A portion of the U.S.
                      Government securities held by the Federal Portfolio may
                      not be backed by the full faith and credit of the U.S.
                      Government.
 
                      U.S. TREASURY PORTFOLIO -- invests in securities backed by
                      the full faith and credit of the U.S. Government.   PAGE 7
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RISK
CHARACTERISTICS       The three Portfolios of the Fund differ primarily in terms
                      of credit risk. Credit risk is the possibility that an
                      issuer of securities held by a Portfolio will fail to make
                      timely payments of either interest or principal. The
                      credit risk of a Portfolio is a function of the credit
                      quality of its underlying securities. All other things
                      being equal, money market instruments with greater credit
                      risk offer higher yields. Although each Portfolio invests
                      in high-quality instruments, money market portfolios,
                      unlike federally-insured bank deposits, are not insured or
                      guaranteed.
    
 
                      In absolute terms, the credit quality of each Portfolio is
                      very high. In relative terms, the U.S. Treasury Portfolio,
                      which invests in full faith and credit obligations of the
                      U.S. Government, offers the lowest credit risk and
                      therefore usually the lowest yield. The Federal Portfolio
                      includes U.S. Government securities that are not backed by
                      the full faith and credit of the U.S. Government, and so
                      potential credit risk and yield are somewhat higher. The
                      Prime Portfolio, although of a very high credit quality in
                      general, invests in the money market obligations of
                      private financial and
 
                                        2
<PAGE>   5
 
                      nonfinancial corporations. It therefore offers the highest
                      relative credit risk and yield of the three
                      Portfolios.                                         PAGE 8
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THE VANGUARD
GROUP                 The Fund is a member of The Vanguard Group of Investment
                      Companies, a group of more than 30 investment companies
                      with more than 80 distinct investment portfolios and total
                      assets in excess of $130 billion. The Vanguard Group, Inc.
                      ("Vanguard"), a subsidiary jointly owned by the Vanguard
                      Funds, provides all corporate management, administrative,
                      distribution and shareholder accounting services on an
                      at-cost basis to the Funds in the Group.           PAGE 10
    
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INVESTMENT
ADVISER               The Fund receives investment advisory services on an
                      at-cost basis from Vanguard's Fixed Income Group. As a
                      result, the Fund receives its investment advisory services
                      at a substantially lower cost than would be possible if
                      the Fund paid an investment advisory fee to an external
                      investment adviser.                                PAGE 11
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DIVIDEND POLICY       Each Portfolio declares a dividend each business day based
                      on its ordinary income. Dividends are paid monthly and may
                      be received in cash or reinvested in additional
                      shares.                                            PAGE 11
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PURCHASING SHARES     You may purchase shares by mail, wire or exchange from
                      another Vanguard Fund. The minimum initial investment is
                      $3,000 per Portfolio; the minimum for subsequent
                      investments is $100. There are no sales commissions or
                      12b-1 fees.                                        PAGE 15
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SELLING SHARES        You may redeem shares of each Portfolio by mail,
                      telephone, wire or check. There is no charge for
                      redemption, except for wire withdrawals under $5,000,
                      which are subject to a $5 charge. Your bank may also
                      assess a fee for incoming wires.
                                                                         PAGE 18
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SERVICES TO
SHAREHOLDERS          The Fund offers free checkwriting services (minimum $250
                      per check) for easy access to your account balance.   
                                                                         PAGE 18
 
   
                      The Fund also offers two special services: Fund Express,
                      for electronic transfers between the Fund and your bank
                      account; and Tele-Account, for around-the-clock telephone
                      access to your Fund account balance and certain
                      transactions.                                      PAGE 23
    
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                                        3
<PAGE>   6
 
   
FUND EXPENSES         The following table illustrates all expenses and fees that
                      you would incur as a shareholder of the Fund. The expenses
                      set forth below are for the 1994 fiscal year.
    
 
   
<TABLE>
                           <S>                                     <C>            <C>           <C>
                           SHAREHOLDER TRANSACTION EXPENSES
                           ----------------------------------------------------------------------------------
                           Sales Load Imposed on Purchases...................................            None
                           Sales Load Imposed on Reinvested 
                             Dividends.......................................................            None
                           Redemption Fees*..................................................            None
                           Exchange Fees.....................................................            None
                                                                         PRIME        FEDERAL   U.S. TREASURY
                           ANNUAL PORTFOLIO OPERATING EXPENSES       PORTFOLIO      PORTFOLIO       PORTFOLIO
                           ----------------------------------------------------------------------------------
                           Management & Administrative                   
                             Expenses............................        0.27%          0.27%           0.27% 
                           Investment Advisory Fees..............         0.01           0.01            0.01
                           12b-1 Fees............................         None           None            None
                           Other Expenses
                             Distribution Costs..................  0.03%          0.03%           0.03%
                             Miscellaneous Expenses..............  0.01           0.01            0.01
                                                                   ----           ----           -----
                           Total Other Expenses..................         0.04           0.04            0.04
                                                                         -----          -----           -----
                                    TOTAL OPERATING EXPENSES.....        0.32%          0.32%           0.32%
                                                                         -----          -----           -----
                                                                         -----          -----           -----
                           *Wire redemptions of less than $5,000 are subject to a $5 processing fee.
</TABLE>
    
 
                      The purpose of this table is to assist you in
                      understanding the various expenses that you would bear
                      directly or indirectly as an investor in the Fund.
 
                      The following example illustrates the expenses that you
                      would incur on a $1,000 investment over various periods,
                      assuming (1) a 5% annual rate of return and (2) redemption
                      at the end of each period. As noted in the table above,
                      the Fund charges no redemption fees of any kind.
 
<TABLE>
<CAPTION>
                                                         1 YEAR     3 YEARS     5 YEARS     10 YEARS
                                                         ------     -------     -------     --------
                        <S>                              <C>        <C>         <C>         <C>
                        Prime Portfolio..............     $  3       $  10       $  18        $ 41
                        Federal Portfolio............     $  3       $  10       $  18        $ 41
                        U.S. Treasury Portfolio......     $  3       $  10       $  18        $ 41
</TABLE>
 
                      THIS EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF
                      PAST OR FUTURE EXPENSES OR PERFORMANCE. ACTUAL EXPENSES
                      MAY BE HIGHER OR LOWER THAN THOSE SHOWN.
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FINANCIAL
HIGHLIGHTS            The following financial highlights for a share outstanding
                      throughout each period, insofar as they relate to each of
                      the five years in the period ended November 30, 1994, have
                      been audited by Price Waterhouse LLP, independent
                      accountants, whose report thereon was unqualified. This
                      information should be read in conjunction with the Fund's
                      financial statements and notes thereto, which are
                      incorporated by reference in the Statement of Additional
                      Information and this Prospectus, and which appear, along
                      with the report of Price Waterhouse LLP, in the Fund's
                      1994 Annual Report to Shareholders. For a more complete
                      discussion of the Fund's performance, please see the
                      Fund's 1994 Annual Report to Shareholders, which may be
                      obtained without charge by writing to the Fund or by
                      calling our Investor Information Department at
                      1-800-662-7447.
    
 
                                        4
<PAGE>   7
 
   
<TABLE>
<CAPTION>
                                            --------------------------------------------------------------------------------------
                                                                               PRIME PORTFOLIO
                                            --------------------------------------------------------------------------------------
                                                                            YEAR ENDED NOVEMBER 30,
                                            --------------------------------------------------------------------------------------
                                 1994       1993       1992       1991      1990     1989     1988     1987     1986     1985
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<S>                           <C>        <C>        <C>        <C>       <C>       <C>      <C>      <C>      <C>      <C>    <C>
NET ASSET VALUE,
  BEGINNING OF YEAR.........    $1.00      $1.00      $1.00      $1.00     $1.00    $1.00    $1.00    $1.00    $1.00    $1.00
                                -----      -----      -----      -----     -----    -----    -----    -----    -----   ------
INVESTMENT OPERATIONS
  Net Investment Income.....     .038       .030       .038       .062      .080     .090     .072     .063     .066     .079
  Net Realized and
    Unrealized
    Gain on Investment
    Securities..............       --         --         --         --        --       --       --       --       --       --
                                -----      -----      -----      -----     -----    -----    -----    -----    -----   ------
    TOTAL FROM INVESTMENT
      OPERATIONS............     .038       .030       .038       .062      .080     .090     .072     .063     .066     .079
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DISTRIBUTIONS
  Dividends from Net
    Investment Income.......    (.038)     (.030)     (.038)     (.062)    (.080)   (.090)   (.072)   (.063)   (.066)   (.079)
  Distributions from
    Realized Capital
    Gains...................       --         --         --         --        --       --       --       --       --       --
                                -----      -----      -----      -----     -----    -----    -----    -----    -----   ------
    TOTAL DISTRIBUTIONS.....    (.038)     (.030)     (.038)     (.062)    (.080)   (.090)   (.072)   (.063)   (.066)   (.079)
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NET ASSET VALUE, END OF
  YEAR......................    $1.00      $1.00      $1.00      $1.00     $1.00    $1.00    $1.00    $1.00    $1.00    $1.00
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TOTAL RETURN................     3.87%      3.02%      3.89%      6.39%     8.32%    9.40%    7.47%    6.49%    6.78%    8.20%
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RATIOS/SUPPLEMENTAL DATA
Net Assets, End of Year
  (Millions)................  $15,109    $12,367    $12,638    $13,496   $13,579   $11,067  $6,863   $4,088   $2,186   $1,725
Ratio of Expenses to Average
  Net Assets................      .32%       .32%       .30%       .30%      .30%     .28%     .33%     .37%     .48%     .51%
Ratio of Net Investment
  Income to Average Net
  Assets....................     3.84%      2.98%      3.82%      6.20%     8.06%    9.05%    7.28%    6.30%    6.60%    7.90%

<CAPTION>
                                            --------------------------------------------------------------------------------------
                                                                               FEDERAL PORTFOLIO
                                            --------------------------------------------------------------------------------------
                                                                            YEAR ENDED NOVEMBER 30,
                                            --------------------------------------------------------------------------------------
                                 1994       1993       1992       1991      1990     1989     1988     1987     1986     1985
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<S>                           <C>        <C>        <C>        <C>       <C>       <C>      <C>      <C>      <C>      <C>    <C>
NET ASSET VALUE, 
  BEGINNING OF YEAR.........    $1.00      $1.00      $1.00      $1.00     $1.00    $1.00    $1.00    $1.00    $1.00    $1.00
                                -----      -----      -----      -----     -----    -----    -----    -----    -----   ------
INVESTMENT OPERATIONS
  Net Investment Income.....     .038       .029       .038       .060      .078     .088     .070     .061     .064     .077
  Net Realized and
    Unrealized
    Gain on Investment
    Securities..............       --         --         --         --        --       --       --       --       --       --
                                -----      -----      -----      -----     -----    -----    -----    -----    -----   ------
    TOTAL FROM INVESTMENT
      OPERATIONS............     .038       .029       .038       .060      .078     .088     .070     .061     .064     .077
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DISTRIBUTIONS
  Dividends from Net
    Investment Income.......    (.038)     (.029)     (.038)     (.060)    (.078)   (.088)   (.070)   (.061)   (.064)   (.077)
  Distributions from
    Realized
    Capital Gains...........       --         --         --         --        --       --       --       --       --       --
                                -----      -----      -----      -----     -----    -----    -----    -----    -----   ------
    TOTAL DISTRIBUTIONS.....    (.038)     (.029)     (.038)     (.060)    (.078)   (.088)   (.070)   (.061)   (.064)   (.077)
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NET ASSET VALUE, END OF
  YEAR......................    $1.00      $1.00      $1.00      $1.00     $1.00    $1.00    $1.00    $1.00    $1.00    $1.00
- ----------------------------------------------------------------------------------------------------------------------------------
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TOTAL RETURN................     3.82%      2.98%      3.83%      6.18%     8.14%    9.15%    7.20%    6.25%    6.56%    8.01%
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RATIOS/SUPPLEMENTAL DATA
Net Assets, End of Year
  (Millions)................   $2,196     $1,907     $1,986     $2,000    $1,950   $1,531   $1,214     $839     $545     $498
Ratio of Expenses to Average
  Net Assets................      .32%       .32%       .30%       .30%      .30%     .28%     .33%     .37%     .48%     .51%
Ratio of Net Investment
  Income to
  Average Net Assets........     3.78%      2.94%      3.76%      6.01%     7.90%    8.78%    7.00%    6.10%    6.40%    7.70%
</TABLE>
    
 
                                        5
<PAGE>   8
 
   
<TABLE>
<CAPTION>
                                  --------------------------------------------------------------------------------------------
                                                                      U.S. TREASURY PORTFOLIO
                                  --------------------------------------------------------------------------------------------
                                                                      YEAR ENDED NOVEMBER 30,
                                  --------------------------------------------------------------------------------------------
                                   1994      1993      1992      1991      1990     1989     1988     1987     1986     1985
- ------------------------------------------------------------------------------------------------------------------------------
<S>                               <C>       <C>       <C>       <C>       <C>       <C>      <C>      <C>      <C>      <C> 
NET ASSET VALUE, BEGINNING OF
  YEAR..........................   $1.00     $1.00     $1.00     $1.00     $1.00    $1.00    $1.00    $1.00    $1.00    $1.00
                                   -----     -----     -----     -----     -----    -----    -----    -----    -----    -----
INVESTMENT OPERATIONS
  Net Investment Income.........    .036      .028      .036      .058      .077     .085     .068     .058     .060     .072
  Net Realized and Unrealized
    Gain
    on Investment Securities....      --        --        --        --        --       --       --       --       --       --
                                   -----     -----     -----     -----     -----    -----    -----    -----    -----    -----
    TOTAL FROM INVESTMENT
      OPERATIONS................    .036      .028      .036      .058      .077     .085     .068     .058     .060     .072
- ------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net Investment
    Income......................   (.036)    (.028)    (.036)    (.058)    (.077)   (.085)   (.068)   (.058)   (.060)   (.072)
  Distributions from Realized
    Capital Gains...............      --        --        --        --        --       --       --       --       --       --
                                   -----     -----     -----     -----     -----    -----    -----    -----    -----    -----
    TOTAL DISTRIBUTIONS.........   (.036)    (.028)    (.036)    (.058)    (.077)   (.085)   (.068)   (.058)   (.060)   (.072)
- ------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF YEAR....   $1.00     $1.00     $1.00     $1.00     $1.00    $1.00    $1.00    $1.00    $1.00    $1.00
- ------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------
TOTAL RETURN....................    3.63%     2.86%     3.68%     5.94%     8.02%    8.89%    7.02%    5.99%    6.15%    7.45%
- ------------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of Year
  (Millions)....................  $2,056    $1,751    $2,321    $2,092    $1,594     $412     $140     $113      $56      $51
Ratio of Expenses to Average Net
  Assets........................     .32%      .32%      .30%      .30%      .30%     .31%+    .70%+    .79%+    .93%+    .96%+
Ratio of Net Investment Income
  to
  Average Net Assets............    3.59%     2.83%     3.60%     5.76%     7.74%    8.44%    6.85%    5.80%    6.00%    7.20%
+Insurance premiums represent .40%, .42%, .44%, .44%, .42% and .37%.
</TABLE>
    
 
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YIELD AND
TOTAL RETURN          From time to time a Portfolio of the Fund may advertise
                      its yield and total return. Both yield and total return
                      figures are based on historical earnings and are not
                      intended to indicate future performance. The "total
                      return" of a Portfolio refers to the average annual
                      compounded rates of return over one-, five- and ten-year
                      periods or over the life of a Portfolio (as stated in the
                      advertisement) that would equate an initial amount
                      invested at the beginning of a stated period to the ending
                      redeemable value of the investment, assuming the
                      reinvestment of all dividends and distributions.
    
 
   
                      In accordance with industry guidelines set forth by the
                      U.S. Securities and Exchange Commission, a Portfolio's
                      "seven-day" or "current" yield reflects the income earned
                      by a hypothetical account in the Portfolio during a
                      seven-day period, expressed as an annual percentage rate.
                      A Portfolio's "effective yield" assumes the income over
                      the seven-day period is reinvested weekly, resulting in a
                      slightly higher stated yield through compounding. Methods
                      used to calculate advertised yields are standardized for
                      money market funds. However, these methods differ from the
                      accounting methods used by a Portfolio to maintain its
                      books and records, and so advertised yields may not fully
                      reflect the income paid to your own account.
    
- --------------------------------------------------------------------------------
 
INVESTMENT
OBJECTIVE             The Fund offers three separate Portfolios. The objective
                      of each Portfolio is to provide the maximum current income
                      that is consistent with the preservation of capital and
                      liquidity by investing in specified money market
                      instruments. Each Portfolio also seeks to maintain a
                      constant net asset value of $1.00 per share.
- --------------------------------------------------------------------------------
 
                                        6
<PAGE>   9

 
INVESTMENT
POLICIES
                      Each Portfolio of the Fund invests in money market
                      instruments that mature in 13 months or less, and each
                      Portfolio maintains an average weighted maturity of 90
                      days or less. The Portfolios differ chiefly in terms of
                      the types of securities in which they invest.
 
   
THE PRIME PORTFOLIO
INVESTS IN HIGH-
QUALITY, MONEY
MARKET SECURITIES
                      The Prime Portfolio will invest in the following
                      high-quality, money market obligations issued by financial
                      institutions, nonfinancial corporations, and the U.S.
                      Government, state and municipal governments and their
                      agencies or instrumentalities:
    
 
                      (1) Negotiable certificates of deposit and bankers'
                          acceptances of U.S. banks having total assets in
                          excess of $1 billion.
 
                      (2) Repurchase agreements that are collateralized by U.S.
                          Treasury obligations, including bills, notes, bonds
                          and other debt obligations or securities issued or
                          guaranteed by agencies and instrumentalities of the
                          U.S. Government (as described in (1) and (2) for the
                          Federal Portfolio).
 
                      (3) Commercial paper (including variable amount master
                          demand notes) rated Prime-1 by Moody's Investors
                          Services, Inc. or A-1 by Standard & Poor's Corporation
                          or, if unrated, issued by a corporation having an
                          outstanding debt issue rated Aa3 or better by Moody's
                          or AA- or better by Standard & Poor's.
 
                      (4) Short-term corporate obligations rated Aa3 or better
                          by Moody's or AA- or better by Standard & Poor's.
 
                      (5) Short-term Eurodollar and Yankee bank obligations.
                          Eurodollar bank obligations are dollar-denominated
                          certificates of deposit or time deposits issued
                          outside the U.S. capital markets by foreign branches
                          of U.S. banks or by foreign banks; Yankee bank
                          obligations are dollar-denominated obligations issued
                          in the U.S. capital markets by foreign banks.
 
                      (6) Securities eligible for purchase by the Federal
                          Portfolio, as described below.
 
                      In addition, up to 10% of the Prime Portfolio's net assets
                      may be invested in "restricted" money market securities,
                      which are not freely marketable or which are subject to
                      restrictions on disposition under the Securities Act of
                      1933.
 
THE FEDERAL PORTFOLIO
INVESTS IN SHORT-TERM,
U.S. GOVERNMENT
OBLIGATIONS
                      In contrast with the Prime Portfolio, which invests in
                      both corporate and government securities, the Federal
                      Portfolio will invest only in the following U.S.
                      Government obligations and repurchase agreements
                      collateralized by such securities:
 
                      (1) United States Treasury obligations including bills,
                          notes, bonds, and other debt obligations issued by the
                          United States Treasury. These securities are backed by
                          the full faith and credit of the U.S. Government.
 
                      (2) Securities issued or guaranteed by agencies and
                          instrumentalities of the U.S. Government. These
                          include securities issued by the Federal Home Loan
                          Banks, Federal Land Bank, Farmers Home Administration,
                          Farm Credit Banks, Federal Intermediate Credit Bank,
                          Federal National Mortgage Association, Federal
                          Financing Bank, Tennessee Valley Authority, and
                          others. Such "agency" securities may not be backed by
                          the full faith and credit of the U.S. Government.
 
                                        7
<PAGE>   10
 
                      (3) Repurchase agreements that are collateralized by the
                          securities listed in (1) and (2) above.
 
THE U.S. TREASURY
PORTFOLIO INVESTS IN
"FULL FAITH AND 
CREDIT" SECURITIES    The U.S. Treasury Portfolio will invest 100% of its assets
                      in securities backed by the full faith and credit of the
                      U.S. Government. Such securities include:
 
                      (1) U.S. Treasury obligations backed by the full faith and
                          credit of the U.S. Government (at least 65% of the
                          Portfolio's assets will be invested in such
                          obligations).
 
                      (2) Other full faith and credit obligations of the U.S.
                          Government. These include securities issued by the
                          General Services Administration, Government National
                          Mortgage Association, Rural Electrification
                          Administration, Small Business Administration, Federal
                          Financing Bank, and others.
 
                      See "Implementation of Policies" for a further description
                      of the Fund's investment practices.
 
                      The investment policies of each Portfolio are not
                      fundamental, and so may be changed without shareholder
                      approval by the Board of Directors. However, shareholders
                      would be notified of any material change in a Portfolio's
                      policies.
- --------------------------------------------------------------------------------
 
   
INVESTMENT
RISKS

THE PORTFOLIOS VARY IN
TERMS OF CREDIT RISK
                      The three Portfolios of the Fund differ primarily in terms
                      of credit risk. Credit risk is the possibility that an
                      issuer of securities held by a Portfolio will fail to make
                      timely payments of either interest or principal. The
                      credit risk of a Portfolio is a function of the credit
                      quality of its underlying securities. Although each
                      Portfolio invests in high-quality instruments, money
                      market portfolios, unlike federally-insured bank deposits,
                      are not insured or guaranteed.
    
 
                      The U.S. Treasury Portfolio invests solely in full faith
                      and credit United States Government securities and
                      therefore has a very low credit risk.
 
                      The Federal Portfolio invests in securities issued by
                      agencies and instrumentalities sponsored by the U.S.
                      Government. Not all securities issued by U.S. agencies and
                      instrumentalities are backed by the full faith and credit
                      of the U.S. Government. As a result, the Federal
                      Portfolio, which is of very high quality in absolute
                      terms, is subject to a slightly higher degree of credit
                      risk than the U.S. Treasury Portfolio. The Federal
                      Portfolio is therefore expected to provide a
                      correspondingly higher yield.
 
   
                      The Prime Portfolio invests primarily in high-quality bank
                      and corporate money market obligations. These obligations,
                      though highly rated, are of somewhat lower credit quality
                      than those issued by the U.S. Government or its agencies
                      and instrumentalities. Thus, the Prime Portfolio is
                      generally expected to provide the highest yield of the
                      three Portfolios.
    
 
THE PORTFOLIOS ARE
SUBJECT TO 
INCOME RISK           Income risk is the potential for a decline in a
                      Portfolio's income due to falling market interest rates.
                      Because the Fund's Portfolios' income is based on
                      short-term interest rates, which can fluctuate
                      substantially over short periods, income risk is expected
                      to be high for the Fund.
- --------------------------------------------------------------------------------
 
                                        8
<PAGE>   11
 
WHO SHOULD
INVEST

INVESTORS SEEKING
CURRENT INCOME AND
PRINCIPAL STABILITY
                      The Fund is intended for investors seeking maximum current
                      income, consistent with the preservation of capital and
                      liquidity. In addition, each Portfolio expects to maintain
                      a constant net asset value of $1.00 per share. The Fund is
                      thus appropriate for investors who desire maximum
                      principal stability.
 
                      The Fund is designed to be a convenient and economical
                      medium for investing short-term funds. It is also useful
                      as a component of a long-term, balanced investment
                      program, consisting of money market instruments, bonds and
                      stocks.
- --------------------------------------------------------------------------------
 
IMPLEMENTATION
OF POLICIES

THE PRIME AND FEDERAL
PORTFOLIOS MAY INVEST
IN REPURCHASE
AGREEMENTS            The Fund follows a number of additional investment
                      practices in pursuit of its objective.
 
                      The Prime and Federal Portfolios may invest in repurchase
                      agreements according to the restrictions and limitations
                      set forth above in "Investment Policies." A repurchase
                      agreement is a means of investing monies for a short
                      period. In a repurchase agreement, a seller--a U.S.
                      commercial bank or recognized U.S. securities
                      dealer--sells securities to a Portfolio and agrees to
                      repurchase the securities at the Portfolio's cost plus
                      interest within a specified period (normally one day). In
                      these transactions, the securities purchased by the
                      Portfolio will have a total value equal to or in excess of
                      the value of the repurchase agreement, and will be held by
                      the Fund's Custodian Bank until repurchased.
 
                      The use of repurchase agreements involves certain risks.
                      For example, if the seller of the agreement defaults on
                      its obligation to repurchase the underlying securities at
                      a time when the value of these securities has declined,
                      the Portfolio may incur a loss upon disposition of them.
                      If the seller of the agreement becomes insolvent and
                      subject to liquidation or reorganization under the
                      bankruptcy code or other laws, a bankruptcy court may
                      determine that the underlying securities are collateral
                      not within the control of the Portfolio and therefore
                      subject to sale by the trustee in bankruptcy. Finally, it
                      is possible that the Portfolio may not be able to
                      substantiate its interest in the underlying securities.
                      While the Fund's management acknowledges these risks, it
                      is expected that they can be controlled through stringent
                      security selection and careful monitoring.
 
THE PRIME PORTFOLIO
MAY INVEST IN
EURODOLLAR OR YANKEE
OBLIGATIONS
                      Eurodollar bank obligations are dollar-denominated
                      certificates of deposit and time deposits issued outside
                      the U.S. capital markets by foreign branches of U.S. banks
                      and by foreign banks. Yankee bank obligations are
                      dollar-denominated obligations issued in the U.S. capital
                      markets by foreign banks.
 
                      Eurodollar and Yankee obligations are subject to the same
                      risks that pertain to domestic issues, notably credit
                      risk, market risk and liquidity risk. Additionally,
                      Eurodollar (and to a limited extent, Yankee) obligations
                      are subject to certain sovereign risks. One such risk is
                      the possibility that a foreign government might prevent
                      dollar-denominated funds from flowing across its borders.
                      Other risks include: adverse political and economic
                      developments in a foreign country; the extent and quality
                      of government regulation of financial markets and
                      institutions; the imposition of foreign withholding taxes;
                      and expropriation or nationalization of foreign issuers.
                      However, Eurodollar and Yankee obligations will undergo
                      the same
 
                                        9
<PAGE>   12
 
                      credit analysis as domestic issues in which the Prime
                      Portfolio invests, and foreign issuers will be required to
                      meet the same tests of financial strength as the domestic
                      issuers approved for the Prime Portfolio.
 
   
PORTFOLIO TURNOVER
WILL BE HIGH
                      Each Portfolio of the Fund is expected to have a high
                      portfolio turnover rate due to the short maturities of the
                      securities purchased. However, this high turnover rate
                      should not increase the Fund's costs since brokerage
                      commissions are not normally charged on the purchase or
                      sale of money market instruments.
    
- --------------------------------------------------------------------------------
 
INVESTMENT
LIMITATIONS

THE FUND HAS
ADOPTED CERTAIN
FUNDAMENTAL
LIMITATIONS
                      Each Portfolio of the Fund has adopted certain limitations
                      designed to reduce its risk exposure. These limitations
                      include the following:
 
                      (a)  A Portfolio will not invest more than 5% of its
                           assets in the securities of any single company,
                           excluding obligations of the United States
                           Government.
 
                      (b)  A Portfolio will not purchase more than 10% of any
                           class of securities of any issuer.
 
                      (c)  A Portfolio will not invest more than 25% of its
                           assets in any one industry, excluding obligations of
                           the United States Government or certificates of
                           deposit or bankers' acceptances of domestic
                           institutions.
 
                      (d)  A Portfolio will not borrow money except for
                           emergency purposes and then not in excess of 15% of
                           total assets.
 
                      These investment limitations are considered at the time
                      investment securities are purchased. The limitations
                      described here and in the Statement of Additional
                      Information may be changed only with the approval of a
                      majority of the Fund's shareholders.
- --------------------------------------------------------------------------------
 
   
MANAGEMENT
OF THE FUND

VANGUARD ADMINISTERS
AND DISTRIBUTES THE
FUND
                      The Fund is a member of The Vanguard Group of Investment
                      Companies, a family of more than 30 investment companies
                      with more than 80 distinct investment portfolios and total
                      assets in excess of $130 billion. Through their
                      jointly-owned subsidiary, The Vanguard Group, Inc.
                      ("Vanguard"), the Fund and the other funds in the Group
                      obtain at cost virtually all of their corporate
                      management, administrative, shareholder accounting and
                      distribution services. Vanguard also provides investment
                      advisory services on an at-cost basis to certain Vanguard
                      funds. As a result of Vanguard's unique corporate
                      structure, the Vanguard funds have costs substantially
                      lower than those of most competing mutual funds. In 1994,
                      the average expense ratio (annual costs including advisory
                      fees divided by total net assets) for the Vanguard funds
                      amounted to approximately .30% compared to an average of
                      1.05% for the mutual fund industry (data provided by
                      Lipper Analytical Services).
    
 
                      The Officers of the Fund manage its day-to-day operations
                      and are responsible to the Fund's Board of Directors. The
                      Directors set broad policies for the Fund and choose its
                      Officers. A list of the Directors and Officers of the Fund
                      and a statement of their present positions and principal
                      occupations during the past five years can be found in the
                      Statement of Additional Information.
 
                                       10
<PAGE>   13
 
                      Vanguard employs a supporting staff of management and
                      administrative personnel needed to provide the requisite
                      services to the funds and also furnishes the funds with
                      necessary office space, furnishings and equipment. Each
                      fund pays its share of Vanguard's total expenses, which
                      are allocated among the funds under methods approved by
                      the Board of Directors (Trustees) of each fund. In
                      addition, each fund bears its own direct expenses, such as
                      legal, auditing and custodian fees.
 
                      Vanguard also provides distribution and marketing services
                      to the Vanguard funds. The funds are available on a
                      no-load basis (i.e., there are no sales commissions or
                      12b-1 fees). However, each fund bears its share of the
                      Group's distribution costs.
- --------------------------------------------------------------------------------
 
   
INVESTMENT
ADVISER

VANGUARD MANAGES
THE FUND'S
INVESTMENTS           The three Portfolios of the Fund receive all investment
                      advisory services on an at-cost basis from Vanguard's
                      Fixed Income Group. The Group also provides investment
                      advisory services to more than 40 Vanguard money market
                      and bond portfolios, both taxable and tax-exempt. Total
                      assets under management by Vanguard's Fixed Income Group
                      were approximately $55 billion as of December 31, 1994.
                      The Fixed Income Group is supervised by the Officers of
                      the Fund. Ian A. MacKinnon, Senior Vice President of
                      Vanguard, has been in charge of the Group since its
                      inception in 1981.
    
 
                      The Fixed Income Group manages the investment and
                      reinvestment of the assets of the Fund's Portfolios and
                      continuously reviews, supervises and administers each
                      Portfolio's investment program, subject to the maturity
                      and quality standards specified in this Prospectus and
                      supplemental guidelines approved by the Fund's Board of
                      Directors. The Fixed Income Group's selection of
                      investments for the Portfolios is based on: (a) continuing
                      credit analysis of those instruments held in the
                      Portfolios and those being considered for inclusion
                      therein; (b) possible disparities in yield relationships
                      between different money market instruments; and (c) actual
                      or anticipated movements in the general level of interest
                      rates.
 
                      The Fixed Income Group is also responsible for the
                      allocation of principal business and portfolio brokerage
                      and the negotiation of commissions. The purchase and sale
                      of investment securities by the Fund will ordinarily be
                      principal transactions. Portfolio securities will normally
                      be purchased directly from the issuer or from an
                      underwriter or market maker for the securities. There
                      usually will be no brokerage commissions paid by a
                      Portfolio for securities purchased from an issuer.
                      Purchases from underwriters of securities will include a
                      commission or concession paid by the issuer to the
                      underwriter, and purchases from dealers serving as market
                      makers will include a dealer's mark-up.
 
                      In purchasing and selling securities for each of the
                      Portfolios, it is the Fund's policy to seek to obtain
                      quality execution at the most favorable prices through
                      issuers or responsible broker-dealers. In selecting
                      broker-dealers to execute the securities transactions for
                      the Portfolios, consideration will be given to such
                      factors as: the price of the security; the rate of the
                      commission; the size and difficulty of the order; the
                      reliability, integrity, financial condition, general
                      execution and operational
 
                                       11
<PAGE>   14
 
                      capabilities of competing broker-dealers; and the overall
                      brokerage and research services provided to the Fund.
- --------------------------------------------------------------------------------
 
DIVIDENDS AND
TAXES

DIVIDENDS ARE PAID ON
THE FIRST BUSINESS DAY
OF EACH MONTH         Each Portfolio's dividends are accrued daily based on
                      ordinary income and are distributed on the first business
                      day of the month. A Portfolio's dividends may be
                      automatically reinvested in additional shares or received
                      in cash. See "Choosing a Distribution Option" for a
                      description of these distribution methods.
 
                      Each Portfolio's dividends are computed and declared daily
                      as of the regular close of the New York Stock Exchange
                      (generally 4:00 p.m. Eastern time), and are payable to
                      shareholders of record as of 10:45 a.m. (Eastern time) on
                      that day. In other words, shareholders whose purchases of
                      shares are effective as of 10:45 a.m. will receive the
                      dividend for that day. See "When Your Account Will Be
                      Credited" for more information on the crediting of
                      dividends.
 
                      Net realized short-term capital gains of each Portfolio,
                      if any, will be distributed whenever the Directors
                      determine that such distributions would be in the best
                      interest of shareholders, but in any event at least once a
                      year. The Portfolios do not expect to realize any
                      long-term capital gains. Should any such gains be
                      realized, they will be distributed annually.
 
                      In addition, in order to satisfy certain distribution
                      requirements of the Tax Reform Act of 1986, the Fund may
                      declare special or regular year-end dividend and capital
                      gains distributions during December. Such distributions,
                      if received by shareholders by January 31, are deemed to
                      have been paid by the Fund and received by shareholders on
                      December 31 of the prior year.
 
DIVIDENDS WILL BE
SUBJECT TO FEDERAL
INCOME TAX
                      Each Portfolio of the Fund intends to continue to qualify
                      for taxation as a "regulated investment company" under the
                      Internal Revenue Code so that it will not be subject to
                      federal income tax to the extent its income is distributed
                      to shareholders. Dividends paid by each Portfolio from net
                      investment income, whether received in cash or reinvested
                      in additional shares, will be taxable to shareholders as
                      ordinary income. For corporate investors, dividends from
                      net investment income will not qualify for the
                      intercorporate dividends-received deduction.
 
   
                      Although the Portfolios do not expect to distribute any
                      long-term capital gains, any capital gains distribution
                      made by a Portfolio would be subject to federal income
                      tax. Such distributions would not qualify for the
                      intercorporate dividends-received deduction.
    
 
                      A sale of shares of a Portfolio, either by redemption or
                      exchange, is a taxable event, and may result in a capital
                      gain or loss. However, since each Portfolio seeks to
                      maintain a constant $1.00 share price for both purchases
                      and redemptions, shareholders are not expected to realize
                      a capital gain or loss upon sale.
 
                      Dividend distributions, any capital gains distributions,
                      and any capital gains or losses from redemptions and
                      exchanges may be subject to state and local taxes.
                      However, depending on your state's tax rules, the portion
                      of a Portfolio's income derived from direct U.S. Treasury
                      obligations may be exempt from state and local
 
                                       12
<PAGE>   15
 
                      taxes. The Fund will indicate each year the portion of a
                      Portfolio's income, if any, that may qualify for this
                      exemption.
 
   
                      The Fund is required to withhold 31% of taxable dividends,
                      capital gains distributions, and redemptions paid to
                      shareholders who have not complied with IRS taxpayer
                      identification regulations. You may avoid this withholding
                      requirement by certifying on your Account Registration
                      Form your proper Social Security or Employer
                      Identification Number and certifying that you are not
                      subject to backup withholding.
    
 
                      The Fund has obtained a Certificate of Authority to do
                      business as a foreign corporation in Pennsylvania, and
                      does business and maintains an office in that state. In
                      the opinion of counsel, the shares of the Fund are exempt
                      from Pennsylvania personal property taxes.
 
                      The tax discussion set forth above is included for general
                      information only. Prospective investors should consult
                      their own tax advisers concerning the tax consequences of
                      an investment in the Fund.
- --------------------------------------------------------------------------------
 
THE SHARE PRICE OF
EACH PORTFOLIO        Each Portfolio's share price or "net asset value" per
                      share is calculated daily at the close of trading on the
                      New York Stock Exchange (generally 4:00 p.m. Eastern
                      time). Each Portfolio determines its net asset value per
                      share by subtracting the Portfolio's liabilities
                      (including accrued expenses and dividends payable) from
                      the total value of the Portfolio's investments and other
                      assets and by dividing the result by the total outstanding
                      shares of the Portfolio.
 
                      For the purpose of calculating each Portfolio's net asset
                      value per share, securities are valued by the "amortized
                      cost" method of valuation, which does not take into
                      account unrealized gains or losses. This involves valuing
                      an instrument at its cost and thereafter assuming a
                      constant amortization to maturity of any discount or
                      premium, regardless of the impact of fluctuating interest
                      rates on the market value of the instrument. While this
                      method provides certainty in valuation, it may result in
                      periods during which value, as determined by amortized
                      cost, is higher or lower than the price the Portfolio
                      would receive if it sold the instrument.
 
                      The use of amortized cost and the maintenance of each
                      Portfolio's per share net asset value at $1.00 is based on
                      its election to operate under the provisions of Rule 2a-7
                      under the Investment Company Act of 1940. As a condition
                      of operating under that rule, each Portfolio must maintain
                      a dollar-weighted average portfolio maturity of 90 days or
                      less, purchase only instruments having remaining
                      maturities of 13 months or less, and invest only in
                      securities that are determined by the Directors to present
                      minimal credit risks and that are of high quality as
                      determined by any major rating service, or in the case of
                      any instrument not so rated, considered by the Directors
                      to be of comparable quality.
 
   
                      The Directors have established procedures designed to
                      stabilize the net asset value per share as computed for
                      the purposes of sales and redemptions at $1.00. These
                      procedures include periodic review, as the Directors deem
                      appropriate and at such intervals as are reasonable in
                      light of current market conditions, of the relationship
                      between the amortized cost value per share and a net asset
                      value per share based
    
 
                                       13
<PAGE>   16
 
                      upon available indications of market value. In such a
                      review, investments for which market quotations are
                      readily available are valued at the most recent bid price
                      or quoted yield equivalent for such securities or for
                      securities of comparable maturity, quality and type as
                      obtained from one or more of the major market makers for
                      the securities to be valued. Other investments and assets
                      are valued at fair value, as determined in good faith by
                      the Directors.
 
   
                      In the event of a deviation of over 1/2 of 1% between a
                      Portfolio's net asset value based upon available market
                      quotations or market equivalents and $1.00 per share based
                      on amortized cost, the Directors will promptly consider
                      what action, if any, should be taken. The Directors will
                      also take such action as they deem appropriate to
                      eliminate or to reduce, to the extent reasonably
                      practicable, any material dilution or other unfair results
                      to investors or existing shareholders which might arise
                      from differences between the two. Such action may include
                      redeeming shares in kind, selling instruments prior to
                      maturity to realize capital gains or losses or to shorten
                      average maturity, withholding dividends, paying
                      distributions from capital or capital gains, or utilizing
                      a net asset value per share based upon available market
                      quotations.
    
- --------------------------------------------------------------------------------
 
GENERAL
INFORMATION           The Fund, formerly known as "Whitehall Money Market
                      Trust," and then as "Vanguard Money Market Trust, Inc.,"
                      is a Maryland corporation. The Fund's Articles of
                      Incorporation permit the Directors to issue 35,000,000,000
                      shares of common stock, with a $.001 par value. The Board
                      of Directors has the power to designate one or more
                      classes ("Portfolios") of shares of common stock and to
                      classify or reclassify any unissued shares with respect to
                      such Portfolios. Currently the Fund is offering shares of
                      three Portfolios.
 
                      The shares of each Portfolio are fully paid and
                      non-assessable; have no preference as to conversion,
                      exchange, dividends, retirement or other features; and
                      have no pre-emptive rights. The shares of each Portfolio
                      have non-cumulative voting rights, meaning that the
                      holders of more than 50% of the shares voting for the
                      election of Directors can elect 100% of the Directors if
                      they choose to do so.
 
                      Annual meetings of shareholders will not be held except as
                      required by the Investment Company Act of 1940 and other
                      applicable law. An annual meeting will be held on the
                      removal of a Director or Directors of the Fund if
                      requested in writing by holders of not less than 10% of
                      the outstanding shares of the Fund.
 
   
                      CoreStates Bank, N.A., Philadelphia, PA, has been retained
                      to act as Custodian of the assets of each Portfolio of the
                      Fund. The Vanguard Group, Inc., Valley Forge, PA, serves
                      as the Fund's Transfer and Dividend Disbursing Agent.
                      Price Waterhouse LLP, serves as independent accountants
                      for the Fund and will audit its financial statements
                      annually. The Fund is not involved in any litigation.
    
- --------------------------------------------------------------------------------
 
                                       14
<PAGE>   17
 
                               SHAREHOLDER GUIDE
OPENING AN
ACCOUNT AND
PURCHASING
SHARES                You may open a regular (non-retirement) account, either by
                      mail or wire. Simply complete and return an Account
                      Registration Form and any required legal documentation,
                      indicating the Portfolio you have chosen and the amount
                      you wish to invest. Your purchase must be equal to or
                      greater than the $3,000 minimum initial investment
                      requirement in any Portfolio ($500 for Uniform
                      Gifts/Transfers to Minors Act accounts). You must open a
                      new Individual Retirement Account by mail (IRAs may not be
                      opened by wire) using a Vanguard IRA Adoption Agreement.
                      Your purchase must be equal to or greater than the $500
                      minimum initial investment requirement, but no more than
                      $2,000 if you are making a regular IRA contribution.
                      Rollover contributions are generally limited to the amount
                      withdrawn within the past 60 days from an IRA or other
                      qualified Retirement Plan. If you need assistance with the
                      forms or have any questions about this Fund, please call
                      our Investor Information Department at 1-800-662-7447.
                      Note: For other account registrations (e.g., corporations,
                      associations, other organizations, trust or powers of
                      attorney), please call us to determine which additional
                      forms you may need.
 
                      Each Portfolio's shares are purchased at a $1.00 net asset
                      value after your investment has been received in the form
                      of Federal Funds. See "When Your Account Will Be
                      Credited". The Fund is offered on a no-load basis (i.e.,
                      there are no sales commissions or 12b-1 fees).
 
ADDITIONAL
INVESTMENTS           Subsequent investments to regular accounts may be made by
                      mail ($100 minimum per Portfolio), wire ($1,000 minimum
                      per Portfolio), exchange from another Vanguard Fund
                      account ($100 minimum per Portfolio), or Vanguard Fund
                      Express. Subsequent investments to Individual Retirement
                      Accounts may be made by mail ($100 minimum) or exchange
                      from another Vanguard Fund account. In some instances,
                      contributions may be made by wire or Vanguard Fund
                      Express. Please call us for more information on these
                      options.
- --------------------------------------------------------------------------------
 
                                       15
<PAGE>   18
 
<TABLE>
<S>                   <C>                                              
                                                                    ADDITIONAL INVESTMENTS
                          NEW ACCOUNT                               TO EXISTING ACCOUNTS

PURCHASING BY MAIL        Please include the amount of              Additional investments should
Complete and sign the     your initial investment and the           include the Invest-by-Mail
enclosed Account          name of the Portfolios you have           remittance form attached to your
Registration Form         selected on the registration              Fund confirmation statements.
                          form, make your check payable to          Please make your check payable
                          The Vanguard Group (Portfolio             to The Vanguard Group (Portfolio
                          Number), see below for the                Number), see below for the
                          appropriate number and mail to:           appropriate number. Write your
                                                                    account number on your check
                                                                    and, using the return envelope 
                          VANGUARD FINANCIAL CENTER                 provided, mail to the address  
                          P.O. BOX 2600                             indicated on the Invest-by-Mail
                          VALLEY FORGE, PA 19482                    Form.                          
                                                                                                   
For express or            VANGUARD FINANCIAL CENTER                 All written requests should be
registered mail,          455 DEVON PARK DRIVE                      mailed to one of the addresses
send to:                  WAYNE, PA 19087                           indicated for new accounts. Do
                                                                    not send registered or express
                                                                    mail to the post office box
                                                                    address.

                          VANGUARD MONEY MARKET RESERVES PORTFOLIOS:
                          Prime Portfolio--30
                          Federal Portfolio--33
                          U.S. Treasury Portfolio--50
                          ------------------------------------------------------
PURCHASING BY WIRE                          CORESTATES BANK, N.A.
Money should be                             ABA 031000011
wired to:                                   CORESTATES NO 01446936
                                            ATTN VANGUARD
BEFORE Wiring                               VANGUARD MONEY MARKET RESERVES
Please contact                              NAME OF PORTFOLIO
Client Services                             ACCOUNT NUMBER
(1-800-662-2739)                            ACCOUNT REGISTRATION
</TABLE>
 
                      To assure proper receipt, please be sure your bank
                      includes the Portfolio name, the account number Vanguard
                      has assigned to you and the eight digit CoreStates number.
                      If you are opening a new account, please complete the
                      Account Registration Form and mail it to the "New Account"
                      address after completing your wire arrangement. Note:
                      Federal Funds wire purchase orders will be accepted only
                      when the Fund and Custodian Bank are open for business.
- --------------------------------------------------------------------------------
 
PURCHASING BY
EXCHANGE (from a
Vanguard account)     You may open an account or purchase additional shares by
                      making an exchange from an existing Vanguard Fund account.
                      Call our Client Services Department at 1-800-662-2739. The
                      new account will have the same registration as the
                      existing account.
- --------------------------------------------------------------------------------
 
                                       16
<PAGE>   19
 
   
PURCHASING BY
FUND EXPRESS

Special Purchase and
Automatic Investment  The Fund Express Special Purchase option lets you move
                      money from your bank account to your Vanguard account on
                      an "as needed" basis. Or if you choose the Automatic
                      Investment option, money will be moved automatically from
                      your bank account to your Vanguard account on the schedule
                      (monthly, bimonthly [every other month], quarterly or
                      yearly) you select. To establish these Fund Express
                      options, please provide the appropriate information on the
                      Account Registration Form. We will send you a confirmation
                      of your Fund Express service; please wait three weeks
                      before using the service.
    
- --------------------------------------------------------------------------------
 
CHOOSING A
DISTRIBUTION
OPTION
                      You must select one of three distribution options:
 
                      1. AUTOMATIC REINVESTMENT OPTION--Both dividends and
                         capital gains distributions will be reinvested in
                         additional Fund shares. This option will be selected
                         for you automatically unless you specify another
                         option.
 
                      2. CASH DIVIDEND OPTION--Your dividends will be paid in
                         cash and your capital gains will be reinvested in
                         additional Fund shares.
 
                      3. ALL CASH OPTION--Both dividend and capital gains
                         distributions will be paid in cash.
 
                      In addition, an option to invest your cash dividends
                      and/or capital gains distributions in another Vanguard
                      Fund Account is available. Please call our Client Services
                      Department (1-800-662-2739) for information. You may also
                      elect Vanguard Dividend Express which allows you to
                      transfer your cash dividends and/or capital gains
                      distributions automatically to your bank account. Please
                      see "Other Vanguard Services" for more information.
 
                      You may change your option by calling our Client Services
                      Department (1-800-662-2739).
- --------------------------------------------------------------------------------
 
IMPORTANT ACCOUNT
INFORMATION

ESTABLISHING OPTIONAL
SERVICES
                      The easiest way to establish optional Vanguard services on
                      your account is to select the options you desire when you
                      complete your Account Registration Form. IF YOU WISH TO
                      ADD SHAREHOLDER OPTIONS LATER, YOU MAY NEED TO PROVIDE
                      VANGUARD WITH ADDITIONAL INFORMATION AND A SIGNATURE
                      GUARANTEE. PLEASE CALL OUR CLIENT SERVICES DEPARTMENT
                      (1-800-662-2739) FOR FURTHER ASSISTANCE.
 
SIGNATURE GUARANTEES  For our mutual protection, we may require a signature
                      guarantee on certain written transaction requests. A
                      signature guarantee verifies the authenticity of your
                      signature, and may be obtained from banks, brokers and any
                      other guarantor that Vanguard deems acceptable. A
                      SIGNATURE GUARANTEE CANNOT BE PROVIDED BY A NOTARY PUBLIC.
 
CERTIFICATES
                      Share certificates will not be issued.
 
BROKER-DEALER
PURCHASES
                      If you purchase shares in Vanguard Funds through a
                      registered broker-dealer or investment adviser, the
                      broker-dealer or adviser may charge a service fee.
 
                                       17
<PAGE>   20
 
   
CANCELLING TRADES     The Fund will not cancel any trade (e.g., a purchase,
                      exchange or redemption) believed to be authentic, received
                      in writing or by telephone, once the trade request has
                      been received.
    
- --------------------------------------------------------------------------------
 
WHEN YOUR
ACCOUNT WILL
BE CREDITED           The trade date is the date on which your account is
                      credited. It is generally the day on which the Fund
                      receives your investment in the form of Federal Funds
                      (monies credited to the Fund's Custodian Bank by a Federal
                      Reserve Bank). Your trade date varies according to your
                      method of payment for your shares.
 
   
                      For purchases by check, the Fund is ordinarily credited
                      with Federal Funds within one business day. Thus, if your
                      purchase by check is received by the regular close of the
                      New York Stock Exchange (generally 4:00 p.m. Eastern
                      time), your trade date is the business day following
                      receipt of your check. If your purchase is received after
                      the close of the Exchange, your trade date is the second
                      business day following receipt of your check. Vanguard
                      will not accept third-party checks to open an account.
                      Please be sure your purchase check is made payable to the
                      Vanguard Group.
    
 
                      For purchases by Federal Funds wire or exchange from
                      another Vanguard Fund, the Fund is credited immediately
                      with Federal Funds. Thus, if your purchase by Federal
                      Funds wire or exchange is received by the close of the
                      Exchange, your trade date is the day of receipt. If your
                      purchase is received after the close of the Exchange, your
                      trade date is the business day following receipt of your
                      wire or exchange.
 
                      Your shares are purchased at a $1.00 net asset value. You
                      will begin to earn dividends on the calendar day following
                      the trade date. (For a Friday trade date, you will begin
                      earning dividends on Saturday.) For a purchase by Federal
                      Funds wire, you may qualify for a dividend on the date of
                      purchase if you have notified the Fund of your intention
                      to make the purchase by 10:45 a.m. (Eastern time) on the
                      business day of the wire.
 
   
                      In order to prevent lengthy processing delays caused by
                      the clearing of foreign checks, Vanguard will only accept
                      a foreign check which has been drawn in U.S. dollars and
                      has been issued by a foreign bank with a U.S.
                      correspondent bank. The name of the U.S. correspondent
                      bank must be printed on the face of the foreign check.
    
 
                      Each Portfolio reserves the right to suspend the offering
                      of shares for a period of time. Each Portfolio also
                      reserves the right to reject any specific purchase
                      request.
- --------------------------------------------------------------------------------
 
SELLING YOUR
SHARES                You may withdraw any portion of the funds in your account
                      by redeeming shares at any time. You may initiate a
                      request by writing or by telephoning. Your redemption
                      proceeds are normally mailed, credited or wired--depending
                      upon the method of withdrawal you have PREVIOUSLY
                      chosen--within two business days after the receipt of the
                      request in Good Order.
 
SELLING BY WRITING A
CHECK
                      You may withdraw funds from your account by writing a
                      check payable in the amount of $250 or more. When a check
                      is presented for payment to the Fund's agent, CoreStates
                      Bank, the Fund will redeem sufficient shares in your
                      account to cover the amount of the check.
 
                                       18
<PAGE>   21
 
                      In order to establish the checkwriting option on your
                      account, all registered shareholders must sign a signature
                      card. After your completed signature card is received by
                      the Fund, an initial supply of checks will be mailed
                      within 10 business days. There is no charge for checks or
                      for their clearance. CORPORATIONS, TRUSTS AND OTHER
                      ORGANIZATIONS SHOULD CALL OUR CLIENT SERVICES DEPARTMENT
                      (1-800-662-2739) BEFORE SUBMITTING SIGNATURE CARDS, AS
                      ADDITIONAL DOCUMENTS MAY BE REQUIRED TO ESTABLISH THE
                      CHECKWRITING SERVICE.
 
                      Before establishing the checkwriting option, you should be
                      aware that:
 
                      1. The Fund does not allow an account to be closed through
                         the checkwriting option.
                      2. Vanguard cannot guarantee a stop payment on the
                         checkwriting option. If you wish to reverse a stop
                         payment order, you must do so in writing.
                      3. The Fund reserves the right to terminate or alter this
                         service at any time.
- --------------------------------------------------------------------------------
 
SELLING BY MAIL
                      Requests should be mailed to VANGUARD FINANCIAL CENTER,
                      VANGUARD MONEY MARKET RESERVES, P.O. BOX 1120, VALLEY
                      FORGE, PA 19482. (For express or registered mail, send
                      your request to Vanguard Financial Center, Vanguard Money
                      Market Reserves, 455 Devon Park Drive, Wayne, PA 19087.)
 
                      The redemption price of shares will be at a $1.00 net
                      asset value per share. All requests must be received in
                      Good Order.
 
DEFINITION OF
GOOD ORDER
                      Good Order means that the request includes the following:
 
                      1. The account number and Portfolio name.
                      2. The amount of the transaction (specified in dollars or
                         shares).
                      3. The signatures of all owners EXACTLY as they are
                         registered on the account.
                      4. Any required signature guarantees.
                      5. Other supporting legal documentation that might be
                         required, in the case of estates, corporations, trusts,
                         and certain other accounts.
 
                      IF YOU HAVE QUESTIONS ABOUT THIS DEFINITION AS IT PERTAINS
                      TO YOUR REQUEST, PLEASE CALL OUR CLIENT SERVICES
                      DEPARTMENT AT 1-800-662-2739.
- --------------------------------------------------------------------------------
 
SELLING BY
TELEPHONE
                      To sell shares by telephone, you or your pre-authorized
                      representative may call our Client Services Department at
                      1-800-662-2739. For telephone redemptions, you may have
                      the proceeds sent to you by mail, or by wire. In addition
                      to the details below, please see "Important Information
                      About Telephone Transactions."
 
                      BY MAIL: Telephone mail redemption is automatically
                      established on your account unless you indicate otherwise
                      on your Account Registration Form. You may redeem any
                      amount by calling Vanguard. The proceeds will be paid to
                      the registered shareholders and mailed to the address of
                      record.
 
                      BY WIRE: Telephone wire redemption must be specifically
                      elected for your account. The best time to elect telephone
                      wire redemption is at the time you complete your Account
                      Registration Form. If you do not presently have telephone
                      wire redemption and wish to establish it, please contact
                      our Client Services Department.
 
                                       19
<PAGE>   22
 
                      With the wire redemption option, you may withdraw a
                      minimum of $1,000 and have the amount wired directly to
                      your bank account. Wire redemptions less than $5,000 are
                      subject to a $5 charge deducted by Vanguard. There is no
                      Vanguard charge for wire redemptions of $5,000 or more.
                      However, your bank may assess a separate fee to accept
                      incoming wires.
 
                      A request to change the bank associated with your wire
                      redemption option must be received in writing, signed by
                      each registered shareholder, and accompanied by a voided
                      check or preprinted deposit slip. A signature guarantee is
                      required if your bank registration is not identical to
                      your Vanguard Fund account registration.
- --------------------------------------------------------------------------------
 
   
SELLING BY FUND
EXPRESS

Automatic Withdrawal
& Special Redemption  If you select the Fund Express AUTOMATIC WITHDRAWAL
                      option, money will be automatically moved from your
                      Vanguard Fund account to your bank account according to
                      the schedule you have selected. The SPECIAL REDEMPTION
                      option lets you move money from your Vanguard account to
                      your bank account on an "as needed" basis. To establish
                      these Fund Express options, please provide the appropriate
                      information on the Account Registration Form. We will send
                      you a confirmation of your Fund Express service; please
                      wait three weeks before using the service.
    
- --------------------------------------------------------------------------------
 
SELLING BY EXCHANGE   You may sell shares of a Portfolio by making an exchange
                      into another Vanguard Fund account. Please see "Exchanging
                      Your Shares" for details.
- --------------------------------------------------------------------------------
 
   
IMPORTANT REDEMPTION
INFORMATION
                      Shares purchased by check or Fund Express may be redeemed
                      at any time. However, your redemption proceeds will not be
                      paid until payment for the purchase is collected, which
                      will take ten calendar days.
    
- --------------------------------------------------------------------------------
 
DELIVERY OF
REDEMPTION PROCEEDS   Redemption requests received by telephone prior to the
                      close of the New York Stock Exchange (generally 4:00 p.m.
                      Eastern time) are processed on the day of receipt and the
                      redemption proceeds are normally sent on the following
                      business day.
 
                      Redemption requests received by telephone after the close
                      of the Exchange are processed on the business day
                      following receipt and the proceeds are normally sent on
                      the second business day following receipt. Redemption
                      proceeds must be sent to you within seven days of receipt
                      of your request in Good Order.
 
                      If you experience difficulty in making a telephone
                      redemption during periods of drastic economic or market
                      changes, your redemption request may be made by regular or
                      express mail. It will be implemented at the net asset
                      value next determined after your request has been received
                      by Vanguard in Good Order. The Fund reserves the right to
                      revise or terminate the telephone redemption privilege at
                      any time.
 
                      The Fund may suspend the redemption right or postpone
                      payment at times when the New York Stock Exchange is
                      closed or under any emergency circumstances as determined
                      by the United States Securities and Exchange Commission.
- --------------------------------------------------------------------------------
 
                                       20
<PAGE>   23
 
VANGUARD'S AVERAGE
COST STATEMENT        If you make a redemption from a qualifying account,
                      Vanguard will send you an Average Cost Statement which
                      provides you with the tax basis of the shares you
                      redeemed. Please see "Other Vanguard Services" for
                      additional information.
- --------------------------------------------------------------------------------
 
   
MINIMUM ACCOUNT
BALANCE REQUIREMENT   Due to the relatively high cost of maintaining smaller
                      accounts, the Fund reserves the right to redeem shares in
                      any account that is below the minimum initial investment
                      amount of $3,000. If at any time your total investment
                      does not have a value of at least $3,000, you may be
                      notified that your account is below the Fund's minimum
                      account balance requirement. You would then be allowed 60
                      days to make an additional investment before the account
                      is liquidated. Proceeds would be promptly paid to the
                      registered shareholder. (This minimum requirement does not
                      apply to IRAs, other retirement accounts, and Uniform
                      Gifts/Transfers to Minors Act accounts.)
    
 
   
                      The Fund's minimum account balance requirement will not
                      apply if your account falls below $3,000 solely as a
                      result of declining markets (i.e., a decline in a Fund's
                      net asset value).
    
- --------------------------------------------------------------------------------
 
EXCHANGING YOUR
SHARES                Should your investment goals change, you may exchange your
                      shares of Vanguard Money Market Reserves for those of
                      other available Vanguard Funds.
 
   
EXCHANGING BY
TELEPHONE

Call Client Services 
at 1-800-662-2739     When exchanging shares by telephone, please have ready the
                      Portfolio name, account number, Social Security Number or
                      Employer Identification number listed on the account, and
                      the exact name and address in which the account is
                      registered. Only the registered shareholder may complete
                      such an exchange. Requests for telephone exchanges
                      received prior to close of trading on the New York Stock
                      Exchange (generally 4:00 p.m. Eastern time) are processed
                      at the close of business that same day. Requests received
                      after close of the Exchange are processed the next
                      business day. Telephone exchanges are not accepted into or
                      from VANGUARD BALANCED INDEX FUND, VANGUARD INDEX TRUST,
                      VANGUARD INTERNATIONAL EQUITY INDEX FUND AND VANGUARD
                      QUANTITATIVE PORTFOLIOS. If you experience difficulty in
                      making a telephone exchange, your exchange request may be
                      made by regular or express mail, and it will be
                      implemented at the closing net asset value on the date
                      received by Vanguard provided the request is received in
                      Good Order.
    
- --------------------------------------------------------------------------------
 
EXCHANGING BY MAIL    Please be sure to include on your exchange request the
                      name and account number of your current Fund, the name of
                      the Fund you wish to exchange into, the amount you wish to
                      exchange, and the signatures of all registered account
                      holders. Send your request to VANGUARD FINANCIAL CENTER,
                      VANGUARD MONEY MARKET RESERVES, P.O. BOX 1120, VALLEY
                      FORGE, PA 19482. (For express or registered mail, send
                      your request to Vanguard Financial Center, Vanguard Money
                      Market Reserves, 455 Devon Park Drive, Wayne, PA 19087.)
- --------------------------------------------------------------------------------
 
IMPORTANT EXCHANGE
INFORMATION
                      Before you make an exchange, you should consider the
                      following:
 
                      - Please read the Fund's prospectus before making an
                        exchange. For a copy and for answers to any questions
                        you may have, call our Investor Information Department
                        (1-800-662-7447).
 
                                       21
<PAGE>   24
 
                      - An exchange is treated as a redemption and a purchase.
                        Therefore, you could realize a taxable gain or loss on
                        the transaction.
 
                      - Exchanges are accepted only if the registrations and the
                        Taxpayer Identification numbers of the two accounts are
                        identical.
 
                      - New accounts are not currently accepted in
                        Vanguard/Windsor Fund.
 
                      - Shares will be redeemed by exchange at the net asset
                        value per share.
 
                      - When opening a new account by exchange, you must meet
                        the minimum investment requirement of the new Fund.
 
                      Every effort will be made to maintain the exchange
                      privilege. However, the Fund reserves the right to revise
                      or terminate its provisions, limit the amount of or reject
                      any exchange, as deemed necessary, at any time.
 
   
                      The exchange privilege is only available in states in
                      which shares of the Fund are registered for sale. The
                      Fund's shares are currently registered for sale in all 50
                      states and the Fund intends to maintain such registration.
    
- --------------------------------------------------------------------------------
 
IMPORTANT
INFORMATION ABOUT
TELEPHONE
TRANSACTIONS          The ability to initiate redemptions (except wire
                      redemptions) and exchanges by telephone is automatically
                      established on your account unless you request in writing
                      that telephone transactions on your account not be
                      permitted.
 
                      To protect your account from losses resulting from
                      unauthorized or fraudulent telephone instructions,
                      Vanguard adheres to the following security procedures:
 
   
                      1. SECURITY CHECK.  To request a transaction by telephone,
                         the caller must know (i) the name of the Portfolio;
                         (ii) the 10-digit account number; (iii) the exact name
                         and address used in the registration; and (iv) the
                         Social Security or Employer Identification number
                         listed on the account.
    
 
                      2. PAYMENT POLICY.  The proceeds of any telephone
                         redemption made by mail will be made payable to the
                         registered shareowner and mailed to the address of
                         record, only.
 
   
                      Neither the Fund nor Vanguard will be responsible for the
                      authenticity of transaction instructions received by
                      telephone, provided that reasonable security procedures
                      have been followed. Vanguard believes that the security
                      procedures described above are reasonable, and that if
                      such procedures are followed, you will bear the risk of
                      any losses resulting from unauthorized or fraudulent
                      telephone transactions on your account.
    
   
- --------------------------------------------------------------------------------
    
 
TRANSFERRING
REGISTRATION          You may transfer the registration of any of your Fund
                      shares to another person by completing a transfer form and
                      sending it to: VANGUARD FINANCIAL CENTER, P.O. BOX 1110,
                      VALLEY FORGE, PA 19482 ATTENTION: TRANSFER DEPARTMENT. The
                      request must be in Good Order. Before mailing your
                      request, please call our Client Services Department
                      (1-800-662-2739) for full instructions.
- --------------------------------------------------------------------------------
 
                                       22
<PAGE>   25
 
   
STATEMENTS AND
REPORTS               Vanguard will send you a confirmation statement each time
                      you initiate a transaction in your account except for
                      checkwriting redemptions from Vanguard money market
                      accounts. You will also receive a comprehensive account
                      statement at the end of each calendar quarter. The
                      fourth-quarter statement will be a year-end statement,
                      listing all transaction activity for the entire calendar
                      year.
    
 
                      Vanguard's Average Cost Statement provides you with the
                      average cost of shares redeemed from your account, using
                      the average cost single category method. This service is
                      available for most taxable accounts opened since January
                      1, 1986. In general, investors who redeem shares from a
                      qualifying Vanguard account may expect to receive their
                      Average Cost Statement in February of the following year.
                      Please call our Client Services Department
                      (1-800-662-2739) for information.
 
                      Financial reports on the Fund will be mailed to you
                      semiannually, according to the Fund's fiscal year-end.
- --------------------------------------------------------------------------------
 
   
OTHER VANGUARD
SERVICES              For more information about any of these services, please
                      call our Investor Information Department at
                      1-800-662-7447.
    
 
VANGUARD DIRECT
DEPOSIT SERVICE
                      With Vanguard's Direct Deposit Service, most U.S.
                      Government checks (including Social Security and military
                      pension checks) and private payroll checks may be
                      automatically deposited into your Vanguard Fund account.
                      Separate brochures and forms are available for direct
                      deposit of U.S. Government and private payroll checks.
 
   
VANGUARD AUTOMATIC
EXCHANGE SERVICE      Vanguard's Automatic Exchange Service allows you to move
                      money automatically among your Vanguard Fund accounts. For
                      instance, the service can be used to "dollar cost average"
                      from a money market portfolio into a stock or bond fund or
                      to contribute to an IRA or other retirement plan. Please
                      contact our Client Services Department at 1-800-662-2739
                      for additional information.
    
 
VANGUARD FUND
EXPRESS
                      Vanguard's Fund Express allows you to transfer money
                      between your Fund account and your account at a bank,
                      savings and loan association, or a credit union that is a
                      member of the Automated Clearing House (ACH) system. You
                      may elect this service on the Account Registration Form or
                      call our Investor Information Department (1-800-662-7447)
                      for a Fund Express application.
 
                      The minimum amount that can be transferred by telephone is
                      $100. However, if you have established one of the
                      automatic options, the minimum amount is $50. The maximum
                      amount that can be transferred using any of the options is
                      $100,000.
 
                      Special rules govern how your Fund Express purchases or
                      redemptions are credited to your account. In addition,
                      some services of Fund Express cannot be used with specific
                      Vanguard Funds. For more information, please refer to the
                      Vanguard Fund Express brochure.
 
VANGUARD DIVIDEND
EXPRESS
                      Vanguard's Dividend Express allows you to transfer your
                      dividends and/or capital gains distributions
                      automatically from your Fund account, one business day
                      after the Fund's payable date, to your account at a bank,
                      savings and loan association, or credit union that is a
                      member of the Automated Clearing House (ACH) network. You
                      may elect this service on the Account Registration Form
                      or call our Investor
 
                                       23
<PAGE>   26
 
                      Information Department (1-800-662-7447) for a Vanguard
                      Dividend Express application.
 
   
VANGUARD
TELE-ACCOUNT          Vanguard's Tele-Account is a convenient, automated service
                      that provides share price, price change and yield
                      quotations on Vanguard Funds through any TouchTone(TM)
                      telephone. This service also lets you obtain information
                      about your account balance, your last transaction, and
                      your most recent dividend or capital gains payment. To
                      contact Vanguard's Tele-Account service, dial
                      1-800-ON-BOARD (1-800-662-6273). A brochure offering
                      detailed operating instructions is available from our
                      Investor Information Department (1-800-662-7447).
    
- --------------------------------------------------------------------------------
 
                                       24
<PAGE>   27
 
   
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<PAGE>   28
 
   
                     (THIS PAGE INTENTIONALLY LEFT BLANK.)
    
<PAGE>   29
 
   
                     (THIS PAGE INTENTIONALLY LEFT BLANK.)
    
<PAGE>   30
<TABLE>
 
- ------------------------------------------------------------------------------------------------------------------------------------
 
   
<S>                              <C>                                    <C>
                                 [LOGO]                                                          [LOGO]
                                 ---------------------------                                                           
                                 THE VANGUARD GROUP                               P   R   O   S   P   E   C   T   U   S
                                 OF INVESTMENT                                                              
                                 COMPANIES                                                    MARCH 17, 1995
                                 Vanguard Financial Center
                                 P.O. Box 2600
                                 Valley Forge, PA 19482

                                 INVESTOR INFORMATION
                                 DEPARTMENT:
                                 1-800-662-7447 (SHIP)

                                 CLIENT SERVICES
                                 DEPARTMENT:
                                 1-800-662-2739 (CREW)

                                 TELE-ACCOUNT FOR
                                 24-HOUR ACCESS:
                                 1-800-662-6273 (ON-BOARD)

                                 TELECOMMUNICATION SERVICE
                                 FOR THE HEARING-IMPAIRED:
                                 1-800-662-2738

                                 TRANSFER AGENT:
                                 The Vanguard Group, Inc.
                                 Vanguard Financial Center
                                 Valley Forge, PA 19482
    
P030                                                                                             [LOGO]
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
<PAGE>   31
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
[LOGO]                                            A Member of The Vanguard Group
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
   
PROSPECTUS--MARCH 17, 1995
    
- --------------------------------------------------------------------------------
 
FUND INFORMATION: PARTICIPANT SERVICES--1-800-523-1188
- --------------------------------------------------------------------------------
 
   
INVESTMENT
OBJECTIVE AND
POLICIES              Vanguard Money Market Reserves, Inc. (the "Fund") is an
                      open-end, diversified investment company known as a money
                      market fund. The Fund offers three separate Portfolios.
                      The objective of each Portfolio is to provide the maximum
                      current income that is consistent with the preservation of
                      capital and liquidity by investing in specified money
                      market instruments. Each Portfolio seeks to maintain a
                      constant net asset value of $1.00 per share. ALTHOUGH EACH
                      PORTFOLIO INVESTS IN HIGH-QUALITY INSTRUMENTS, AN
                      INVESTMENT IN THE PORTFOLIOS IS NEITHER INSURED NOR
                      GUARANTEED BY THE U.S. GOVERNMENT AND THERE CAN BE NO
                      ASSURANCE THAT EACH PORTFOLIO WILL BE ABLE TO MAINTAIN A
                      CONSTANT NET ASSET VALUE OF $1.00 PER SHARE.
    
- --------------------------------------------------------------------------------
 
IMPORTANT NOTE        This Prospectus is intended exclusively for participants
                      in employer-sponsored retirement or savings plans, such as
                      tax-qualified pension and profit-sharing plans and 401(k)
                      thrift plans, as well as 403(b) custodial accounts for
                      non-profit educational and charitable organizations.
                      Another version of this Prospectus, containing information
                      on how to open a personal investment account with the
                      Fund, is available for individual investors. To obtain a
                      copy of that version of the Prospectus, please call
                      1-800-662-7447.
- --------------------------------------------------------------------------------
 
OPENING AN
ACCOUNT               A Portfolio of the Fund is an investment option under a
                      retirement or savings program sponsored by your employer.
                      The administrator of your retirement plan or your employee
                      benefits office can provide you with detailed information
                      on how to participate in your plan and how to elect a
                      Portfolio of the Fund as an investment option.
 
                      If you have any questions about the Fund, please contact
                      Participant Services at 1-800-523-1188. If you have any
                      questions about your plan account, contact your plan
                      administrator or the organization that provides
                      recordkeeping services for your plan.
- --------------------------------------------------------------------------------
 
   
ABOUT THIS
PROSPECTUS            This Prospectus is designed to set forth concisely the
                      information you should know about the Fund before you
                      invest. It should be retained for future reference. A
                      "Statement of Additional Information" containing
                      additional information about the Fund has been filed with
                      the Securities and Exchange Commission. This Statement is
                      dated March 17, 1995, and has been incorporated by
                      reference into this Prospectus. A copy may be obtained
                      without charge by writing to the Fund or by calling the
                      Investor Information Department.
    
- --------------------------------------------------------------------------------
 
TABLE OF CONTENTS
 
   
<TABLE>

                                  Page                                       Page                                          Page
<S>                                <C>     <C>                                <C>     <C>                                    <C>
Highlights .......................  2      Investment Risks .................  8      Dividends and Taxes .................. 12
Fund Expenses ....................  4      Who Should Invest ................  9      The Share Price of Each Portfolio .... 12
Financial Highlights .............  4      Implementation of Policies .......  9     General Information ................... 13
Yield and Total Return ...........  6      Investment Limitations ........... 10                                           
Investment Objective .............  7      Management of the Fund ........... 10                  SERVICE GUIDE
Investment Policies ..............  7      Investment Adviser ............... 11      Participating in Your Plan ........... 14
</TABLE>
    
 
- --------------------------------------------------------------------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE COMMISSION PASSED UPON THE ACCURACY OR
ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
OFFENSE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   32
 
                                   HIGHLIGHTS
 
OBJECTIVE AND
POLICIES
                      Vanguard Money Market Reserves, Inc. (the "Fund") is an
                      open-end, diversified investment company known as a money
                      market fund. The Fund offers three separate Portfolios.
                      The objective of each Portfolio is to provide the maximum
                      current income that is consistent with the preservation of
                      capital and liquidity by investing in specified money
                      market instruments.
 
                      Each Portfolio seeks to maintain a constant net asset
                      value of $1.00 per share. In pursuit of this objective,
                      each Portfolio will invest in securities that mature in
                      less than 13 months, and each Portfolio will maintain an
                      average weighted maturity of 90 days or less.       PAGE 7
- --------------------------------------------------------------------------------
 
THREE SEPARATE
PORTFOLIOS            Investors may choose from three separate Portfolios, each
                      of which invests in specified money market instruments:
 
   
                      PRIME PORTFOLIO -- invests in high-quality money market
                      obligations issued by financial institutions, nonfinancial
                      corporations, and the U.S. Government, state and municipal
                      governments and their agencies or instrumentalities, as
                      well as repurchase agreements collateralized by such
                      securities. The Prime Portfolio also invests in Eurodollar
                      obligations (dollar-denominated obligations issued outside
                      the U.S. by foreign banks or foreign branches of domestic
                      banks) and Yankee obligations (dollar-denominated
                      obligations issued in the U.S. by foreign banks).
    
 
                      FEDERAL PORTFOLIO -- invests in securities issued by the
                      United States Government or its agencies and
                      instrumentalities, and repurchase agreements
                      collateralized by such securities. A portion of the U.S.
                      Government securities held by the Federal Portfolio may
                      not be backed by the full faith and credit of the U.S.
                      Government.
 
                      U.S. TREASURY PORTFOLIO -- invests in securities backed by
                      the full faith and credit of the U.S. Government.   PAGE 7
- --------------------------------------------------------------------------------
 
   
RISK
CHARACTERISTICS       The three Portfolios of the Fund differ primarily in terms
                      of credit risk. Credit risk is the possibility that an
                      issuer of securities held by a Portfolio will fail to make
                      timely payments of either interest or principal. The
                      credit risk of a Portfolio is a function of the credit
                      quality of its underlying securities. All other things
                      being equal, money market instruments with greater credit
                      risk offer higher yields. Although each Portfolio invests
                      in high-quality instruments, money market portfolios,
                      unlike federally-insured bank deposits, are not insured or
                      guaranteed.
    
 
                      In absolute terms, the credit quality of each Portfolio is
                      very high. In relative terms, the U.S. Treasury Portfolio,
                      which invests in full faith and credit obligations of the
                      U.S. Government, offers the lowest credit risk and
                      therefore usually the lowest yield. The Federal Portfolio
                      includes U.S. Government securities that are not backed by
                      the full faith and credit of the U.S. Government, and so
                      potential credit risk and yield are somewhat higher. The
                      Prime Portfolio, although of a very high credit quality in
                      general, invests in the money market obligations of
                      private financial and nonfinan-
 
                                        2
<PAGE>   33
 
                      cial corporations. It therefore offers the highest
                      relative credit risk and yield of the three
                      Portfolios.                                         PAGE 8
- --------------------------------------------------------------------------------
 
   
THE VANGUARD
GROUP                 The Fund is a member of The Vanguard Group of Investment
                      Companies, a group of more than 30 investment companies
                      with more than 80 distinct investment portfolios and total
                      assets in excess of $130 billion. The Vanguard Group, Inc.
                      ("Vanguard"), a subsidiary jointly owned by the Vanguard
                      Funds, provides all corporate management, administrative,
                      distribution and shareholder accounting services on an
                      at-cost basis to the Funds in the Group.           PAGE 10
    
- --------------------------------------------------------------------------------
 
INVESTMENT
ADVISER               The Fund receives investment advisory services on an
                      at-cost basis from Vanguard's Fixed Income Group. As a
                      result, the Fund receives its investment advisory services
                      at a substantially lower cost than would be possible if
                      the Fund paid an investment advisory fee to an external
                      investment adviser.                                PAGE 11
- --------------------------------------------------------------------------------
 
DIVIDEND POLICY       Each Portfolio declares a dividend each business day based
                      on its ordinary income (interest income less expenses).
                      Dividends are paid monthly. Dividends are automatically
                      reinvested in additional shares.                   PAGE 12
- --------------------------------------------------------------------------------
 
                                        3
<PAGE>   34
 
   
FUND
EXPENSES              The following table illustrates all expenses and fees that
                      a shareholder of the Fund would incur. The expenses set
                      forth below are for the 1994 fiscal year.
    
 
<TABLE>
                           <S>                                                                          <C>
                                                    SHAREHOLDER TRANSACTION EXPENSES          
                           -----------------------------------------------------------------------------------
                           Sales Load Imposed on Purchases........................................       None
                           Sales Load Imposed on Reinvested Dividends.............................       None
                           Redemption Fees*.......................................................       None
                           Exchange Fees..........................................................       None
</TABLE>
 
   
<TABLE>
<CAPTION>
                                                                        PRIME        FEDERAL      U.S. TREASURY
                              ANNUAL PORTFOLIO OPERATING EXPENSES     PORTFOLIO     PORTFOLIO       PORTFOLIO
                           <S>                                        <C>   <C>     <C>   <C>     <C>     <C>
                           -------------------------------------------------------------------------------------
                           Management & Administrative Expenses......       0.27%         0.27%           0.27%
                           Investment Advisory Fees..................       0.01          0.01            0.01
                           12b-1 Fees................................       None          None            None
                           Other Expenses
                             Distribution Costs...................... 0.03%         0.03%         0.03%
                             Miscellaneous Expenses.................. 0.01          0.01          0.01
                                                                            ----          ----            ----
                           Total Other Expenses......................       0.04          0.04            0.04
                                                                            ----          ----            ----
                                    TOTAL OPERATING EXPENSES.........       0.32%         0.32%           0.32%
                                                                            ====          ====            ====

</TABLE>
    
 
                      *Wire redemptions of less than $5,000 are subject to a $5
                      processing fee.

                      The purpose of this table is to assist you in
                      understanding the various expenses an investor would bear
                      directly or indirectly as a shareholder in the Fund.
 
                      The following example illustrates the expenses that you
                      would incur on a $1,000 investment over various periods,
                      assuming (1) a 5% annual rate of return and (2) redemption
                      at the end of each period. As noted in the table above,
                      the Fund charges no redemption fees of any kind.
 
<TABLE>
<CAPTION>
                                                                   1 YEAR     3 YEARS     5 YEARS     10 YEARS
                                                                  --------   ---------   ---------   ----------
                               <S>                                <C>        <C>         <C>         <C>
                               Prime Portfolio.................      $3         $10         $18         $41
                               Federal Portfolio...............      $3         $10         $18         $41
                               U.S. Treasury Portfolio.........      $3         $10         $18         $41
</TABLE>
 
                      THIS EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF
                      PAST OR FUTURE EXPENSES OR PERFORMANCE. ACTUAL EXPENSES
                      MAY BE HIGHER OR LOWER THAN THOSE SHOWN.
- --------------------------------------------------------------------------------
 
   
FINANCIAL
HIGHLIGHTS            The following financial highlights for a share outstanding
                      throughout each period, insofar as they relate to each of
                      the five years in the period ended November 30, 1994, have
                      been audited by Price Waterhouse LLP, independent
                      accountants, whose report thereon was unqualified. This
                      information should be read in conjunction with the Fund's
                      financial statements and notes thereto which are
                      incorporated by reference in the Statement of Additional
                      Information and this Prospectus, and which appear, along
                      with the report of Price Waterhouse LLP, in the Fund's
                      1994 Annual Report to Shareholders. For a more complete
                      discussion of the Fund's performance, please see the
                      Fund's 1994 Annual Report to Shareholders, which may be
                      obtained without charge by writing to the Fund or by
                      calling Participant Services at 1-800-523-1188.
    
 
                                        4
<PAGE>   35
 
   
<TABLE>
<CAPTION>
                                  ---------------------------------------------------------------------------------------------
                                                                           PRIME PORTFOLIO
                                  ---------------------------------------------------------------------------------------------
                                                                       YEAR ENDED NOVEMBER 30,
                                  ---------------------------------------------------------------------------------------------
                                   1994      1993      1992      1991      1990      1989     1988     1987     1986     1985
- -------------------------------------------------------------------------------------------------------------------------------
<S>                               <C>       <C>       <C>       <C>       <C>       <C>      <C>      <C>      <C>      <C>
NET ASSET VALUE, BEGINNING OF
  YEAR........................    $1.00     $1.00     $1.00     $1.00     $1.00     $1.00    $1.00    $1.00    $1.00    $1.00
                                  -----     -----     -----     -----     -----     -----    -----    -----    -----    -----
INVESTMENT OPERATIONS
  Net Investment Income.......     .038      .030      .038      .062      .080      .090     .072     .063     .066     .079
  Net Realized and Unrealized
    Gain on Investment
    Securities................       --        --        --        --        --        --       --       --       --       --
                                  -----     -----     -----     -----     -----     -----    -----    -----    -----    -----
    TOTAL FROM INVESTMENT
      OPERATIONS..............     .038      .030      .038      .062      .080      .090     .072     .063     .066     .079
- -------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net
    Investment Income.........    (.038)    (.030)    (.038)    (.062)    (.080)    (.090)   (.072)   (.063)   (.066)   (.079)
  Distributions from Realized
    Capital Gains.............       --        --        --        --        --        --       --       --       --       --
                                  -----     -----     -----     -----     -----     -----    -----    -----    -----    -----
    TOTAL DISTRIBUTIONS.......    (.038)    (.030)    (.038)    (.062)    (.080)    (.090)   (.072)   (.063)   (.066)   (.079)
- -------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF
  YEAR........................    $1.00     $1.00     $1.00     $1.00     $1.00     $1.00    $1.00    $1.00    $1.00    $1.00
===============================================================================================================================
TOTAL RETURN..................     3.87%     3.02%     3.89%     6.39%     8.32%     9.40%    7.47%    6.49%    6.78%    8.20%
===============================================================================================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of Year
  (Millions)..................  $15,109   $12,367   $12,638   $13,496   $13,579   $11,067   $6,863   $4,088   $2,186   $1,725
Ratio of Expenses to Average
  Net Assets..................      .32%      .32%      .30%      .30%      .30%      .28%     .33%     .37%     .48%     .51%
Ratio of Net Investment Income
  to Average Net Assets.......     3.84%     2.98%     3.82%     6.20%     8.06%     9.05%    7.28%    6.30%    6.60%    7.90%
- -------------------------------------------------------------------------------------------------------------------------------
<CAPTION>

                                                                       FEDERAL PORTFOLIO
                                  ---------------------------------------------------------------------------------------------
                                                                    YEAR ENDED NOVEMBER 30,
                                  ---------------------------------------------------------------------------------------------
                                   1994      1993      1992      1991      1990      1989     1988     1987     1986     1985
- -------------------------------------------------------------------------------------------------------------------------------
<S>                               <C>       <C>       <C>       <C>       <C>       <C>      <C>      <C>      <C>      <C>
NET ASSET VALUE, BEGINNING OF
  YEAR........................    $1.00     $1.00     $1.00     $1.00     $1.00     $1.00    $1.00    $1.00    $1.00    $1.00
                                  -----     -----     -----     -----     -----     -----    -----    -----    -----    -----
INVESTMENT OPERATIONS
  Net Investment Income.......     .038      .029      .038      .060      .078      .088     .070     .061     .064     .077
  Net Realized and Unrealized
    Gain on Investment
    Securities................       --        --        --        --        --        --       --       --       --       --
                                  -----     -----     -----     -----     -----     -----    -----    -----    -----    -----
    TOTAL FROM INVESTMENT
      OPERATIONS..............     .038      .029      .038      .060      .078      .088     .070     .061     .064     .077
- -------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net
    Investment Income.........    (.038)    (.029)    (.038)    (.060)    (.078)    (.088)   (.070)   (.061)   (.064)   (.077)
    Distributions from
      Realized
      Capital Gains...........       --        --        --        --        --        --       --       --       --       --
                                  -----     -----     -----     -----     -----     -----    -----    -----    -----    -----
    TOTAL DISTRIBUTIONS.......    (.038)    (.029)    (.038)    (.060)    (.078)    (.088)   (.070)   (.061)   (.064)   (.077)
- -------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF
  YEAR........................    $1.00     $1.00     $1.00     $1.00     $1.00     $1.00    $1.00    $1.00    $1.00    $1.00
===============================================================================================================================
TOTAL RETURN..................     3.82%     2.98%     3.83%     6.18%     8.14%     9.15%    7.20%    6.25%    6.56%    8.01%
===============================================================================================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of Year
  (Millions)..................   $2,196    $1,907    $1,986    $2,000    $1,950    $1,531   $1,214     $839     $545     $498
Ratio of Expenses to Average
  Net Assets..................      .32%      .32%      .30%      .30%      .30%      .28%     .33%     .37%     .48%     .51%
Ratio of Net Investment Income
  to Average Net Assets.......     3.78%     2.94%     3.76%     6.01%     7.90%     8.78%    7.00%    6.10%    6.40%    7.70%
</TABLE>
    
 
                                        5
<PAGE>   36
 
   
<TABLE>
<CAPTION>

                                 -----------------------------------------------------------------------------------------------
                                                                       U.S. TREASURY PORTFOLIO
                                 -----------------------------------------------------------------------------------------------
                                                                       YEAR ENDED NOVEMBER 30,
                                 -----------------------------------------------------------------------------------------------
                                   1994      1993      1992      1991      1990      1989     1988     1987     1986     1985
- --------------------------------------------------------------------------------------------------------------------------------
<S>                               <C>       <C>       <C>       <C>       <C>       <C>      <C>      <C>      <C>      <C>
NET ASSET VALUE, BEGINNING OF
  YEAR........................    $1.00     $1.00     $1.00     $1.00     $1.00     $1.00    $1.00    $1.00    $1.00    $1.00
                                  -----     -----     -----     -----     -----     -----    -----    -----    -----    -----
INVESTMENT OPERATIONS
  Net Investment Income.......     .036      .028      .036      .058      .077      .085     .068     .058     .060     .072
  Net Realized and Unrealized
    Gain on Investment
    Securities................       --        --        --        --        --        --       --       --       --       --
                                  -----     -----     -----     -----     -----     -----    -----    -----    -----    -----
    TOTAL FROM INVESTMENT
      OPERATIONS..............     .036      .028      .036      .058      .077      .085     .068     .058     .060     .072
- --------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net
    Investment Income.........    (.036)    (.028)    (.036)    (.058)    (.077)    (.085)   (.068)   (.058)   (.060)   (.072)
    Distributions from
      Realized
      Capital Gains...........       --        --        --        --        --        --       --       --       --       --
                                  -----     -----     -----     -----     -----     -----    -----    -----    -----    -----
    TOTAL DISTRIBUTIONS.......    (.036)    (.028)    (.036)    (.058)    (.077)    (.085)   (.068)   (.058)   (.060)   (.072)
- --------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF
  YEAR........................    $1.00     $1.00     $1.00     $1.00     $1.00     $1.00    $1.00    $1.00    $1.00    $1.00
================================================================================================================================
TOTAL RETURN..................     3.63%     2.86%     3.68%     5.94%     8.02%     8.89%    7.02%    5.99%    6.15%    7.45%
================================================================================================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of Year
  (Millions)..................   $2,056    $1,751    $2,321    $2,092    $1,594      $412     $140     $113      $56      $51
Ratio of Expenses to Average
  Net Assets..................      .32%      .32%      .30%      .30%      .30%      .31%+    .70%+    .79%+    .93%+    .96%+
Ratio of Net Investment Income
  to Average Net Assets.......     3.59%     2.83%     3.60%     5.76%     7.74%     8.44%    6.85%    5.80%    6.00%    7.20%
</TABLE>
    
 
+ Insurance premiums represent .40%, .42%, .44%, .44%, .42% and .37%.
- --------------------------------------------------------------------------------
 
   
YIELD AND TOTAL
RETURN                From time to time a Portfolio of the Fund may advertise
                      its yield and total return. Both yield and total return
                      figures are based on historical earnings and are not
                      intended to indicate future performance. The "total
                      return" of a Portfolio refers to the average annual
                      compounded rates of return over one-, five- and ten-year
                      periods or over the life of a Portfolio (as stated in the
                      advertisement) that would equate an initial amount
                      invested at the beginning of a stated period to the ending
                      redeemable value of the investment, assuming the
                      reinvestment of all dividends and distributions.
    
 
   
                      In accordance with industry guidelines set forth by the
                      U.S. Securities and Exchange Commission, a Portfolio's
                      "seven-day" or "current" yield reflects the income earned
                      by a hypothetical account in the Portfolio during a
                      seven-day period, expressed as an annual percentage rate.
                      A Portfolio's "effective yield" assumes the income over
                      the seven-day period is reinvested weekly, resulting in a
                      slightly higher stated yield through compounding. Methods
                      used to calculate advertised yields are standardized for
                      money market funds. However, these methods differ from the
                      accounting methods used by a Portfolio to maintain its
                      books and records, and so advertised yields may not fully
                      reflect the income paid to your own account.
    
- --------------------------------------------------------------------------------
 
                                        6
<PAGE>   37
 
INVESTMENT
OBJECTIVE             The Fund offers three separate Portfolios. The objective
                      of each Portfolio is to provide the maximum current income
                      that is consistent with the preservation of capital and
                      liquidity by investing in specified money market
                      instruments. Each Portfolio also seeks to maintain a
                      constant net asset value of $1.00 per share.
- --------------------------------------------------------------------------------
 
INVESTMENT
POLICIES              Each Portfolio of the Fund invests in money market
                      instruments that mature in 13 months or less, and each
                      Portfolio maintains an average weighted maturity of 90
                      days or less. The Portfolios differ chiefly in terms of
                      the types of securities in which they invest.
 
   
THE PRIME PORTFOLIO
INVESTS IN HIGH-
QUALITY, MONEY
MARKET SECURITIES     The Prime Portfolio will invest in the following
                      high-quality, money market obligations issued by financial
                      institutions, nonfinancial corporations, and the U.S.
                      Government, state and municipal governments and their
                      agencies or instrumentalities:
    
 
                      (1) Negotiable certificates of deposit and bankers'
                          acceptances of U.S. banks having total assets in
                          excess of $1 billion.
 
                      (2) Repurchase agreements that are collateralized by U.S.
                          Treasury obligations, including bills, notes, bonds
                          and other debt obligations or securities issued or
                          guaranteed by agencies and instrumentalities of the
                          U.S. Government (as described in (2) for the Federal
                          Portfolio).
 
                      (3) Commercial paper (including variable amount master
                          demand notes) rated Prime-1 by Moody's Investors
                          Services, Inc. or A-1 by Standard & Poor's Corporation
                          or, if unrated, issued by a corporation having an
                          outstanding debt issue rated Aa or better by Moody's
                          or AA or better by Standard & Poor's.
 
                      (4) Short-term corporate obligations rated Aa or better by
                          Moody's or AA or better by Standard & Poor's.
 
                      (5) Short-term Eurodollar and Yankee bank obligations.
                          Eurodollar bank obligations are dollar-denominated
                          certificates of deposit or time deposits issued
                          outside the U.S. capital markets by foreign branches
                          of U.S. banks or by foreign banks; Yankee bank
                          obligations are dollar-denominated obligations issued
                          in the U.S. capital markets by foreign banks.
 
                      (6) Securities eligible for purchase by the Federal
                          Portfolio, as described below.
 
                      In addition, up to 10% of the Prime Portfolio's net assets
                      may be invested in "restricted" money market securities,
                      which are not freely marketable or which are subject to
                      restrictions on disposition under the Securities Act of
                      1933.
 
THE FEDERAL PORTFOLIO
INVESTS IN SHORT-TERM,
U.S. GOVERNMENT
OBLIGATIONS
                      In contrast with the Prime Portfolio, which invests in
                      both corporate and government securities, the Federal
                      Portfolio will invest only in the following U.S.
                      Government obligations and repurchase agreements
                      collateralized by such securities:
 
                      (1) United States Treasury obligations including bills,
                          notes, bonds, and other debt obligations issued by the
                          United States Treasury. These securities are backed by
                          the full faith and credit of the U.S. Government.
 
                                        7
<PAGE>   38
 
                      (2) Securities issued or guaranteed by agencies and
                          instrumentalities of the U.S. Government. These
                          include securities issued by the Federal Home Loan
                          Banks, Federal Land Bank, Farmers Home Administration,
                          Farm Credit Banks, Federal Intermediate Credit Bank,
                          Federal National Mortgage Association, Federal
                          Financing Bank, Tennessee Valley Authority, and
                          others. Such "agency" securities may not be backed by
                          the full faith and credit of the U.S. Government.
 
                      (3) Repurchase agreements that are collateralized by the
                          securities listed in (1) and (2) above.
 
THE U.S. TREASURY
PORTFOLIO INVESTS IN
"FULL FAITH AND CREDIT"
SECURITIES            The U.S. Treasury Portfolio will invest 100% of its assets
                      in securities backed by the full faith and credit of the
                      U.S. Government. Such securities include:
 
                      (1) U.S. Treasury obligations backed by the full faith and
                          credit of the U.S. Government (at least 65% of the
                          Portfolio's assets will be invested in such
                          obligations).
 
                      (2) Other full faith and credit obligations of the U.S.
                          Government. These include securities issued by the
                          General Services Administration, Government National
                          Mortgage Association, Rural Electrification
                          Administration, Small Business Administration, Federal
                          Financing Bank, and others.
 
                      See "Implementation of Policies" for a further description
                      of the Fund's invest-ment practices.
 
                      The investment policies of each Portfolio are not
                      fundamental, and so may be changed without shareholder
                      approval by the Board of Directors. However, shareholders
                      would be notified of any material change in a Portfolio's
                      policies.
- --------------------------------------------------------------------------------
 
   
INVESTMENT
RISKS

THE PORTFOLIOS VARY   
IN TERMS OF CREDIT 
RISK                  The three Portfolios of the Fund differ primarily in terms
                      of credit risk. Credit risk is the possibility that an
                      issuer of securities held by a Portfolio will fail to make
                      timely payments of either interest or principal. The
                      credit risk of a Portfolio is a function of the credit
                      quality of its underlying securities. Although each
                      Portfolio invests in high-quality instruments, money
                      market portfolios, unlike federally-insured bank deposits,
                      are not insured or guaranteed.
    
 
                      The U.S. Treasury Portfolio invests solely in full faith
                      and credit United States Government securities and
                      therefore has a very low credit risk.
 
                      The Federal Portfolio invests in securities issued by
                      agencies and instrumentalities sponsored by the U.S.
                      Government. Not all securities issued by U.S. agencies and
                      instrumentalities are backed by the full faith and credit
                      of the U.S. Government. As a result, the Federal
                      Portfolio, which is of very high quality in absolute
                      terms, is subject to a slightly higher degree of credit
                      risk than the U.S. Treasury Portfolio. The Federal
                      Portfolio is therefore expected to provide a
                      correspondingly higher yield.
 
   
                      The Prime Portfolio invests primarily in high-quality bank
                      and corporate money market obligations. These obligations,
                      though highly rated, are of somewhat lower credit quality
                      than those issued by the U.S. Government or its agencies
                      and
    
 
                                        8
<PAGE>   39
 
                      instrumentalities. Thus, the Prime Portfolio is generally
                      expected to provide the highest yield of the three
                      Portfolios.
 
THE PORTFOLIOS ARE
SUBJECT TO INCOME 
RISK                  Income risk is the potential for a decline in a
                      Portfolio's income due to falling market interest rates.
                      Because the Fund's Portfolios' income is based on
                      short-term interest rates, which can fluctuate
                      substantially over short periods, income risk is expected
                      to be high for the Fund.
- --------------------------------------------------------------------------------
 
WHO SHOULD
INVEST

INVESTORS SEEKING
CURRENT INCOME AND
PRINCIPAL STABILITY   The Fund is intended for investors seeking maximum current
                      income, consistent with the preservation of capital and
                      liquidity. In addition, each Portfolio expects to maintain
                      a constant net asset value of $1.00 per share. The Fund is
                      thus appropriate for investors who desire maximum
                      principal stability.
 
                      The Fund is designed to be a convenient and economical
                      medium for investing short-term funds. It is also useful
                      as a component of a long-term, balanced investment
                      program, consisting of money market instruments, bonds and
                      stocks.
- --------------------------------------------------------------------------------
 
IMPLEMENTATION        The Fund follows a number of additional investment
OF POLICIES           practices in pursuit of its objective.

THE PRIME AND FEDERAL
PORTFOLIOS MAY INVEST
IN REPURCHASE
AGREEMENTS            
   
                      The Prime and Federal Portfolios may invest in repurchase
                      agreements according to the restrictions and limitations
                      set forth above in "Investment Policies." A repurchase
                      agreement is a means of investing monies for a short
                      period. In a repurchase agreement, a seller -- a U.S.
                      commercial bank or recognized U.S. securities
                      dealer -- sells securities to a Portfolio and agrees to
                      repurchase the securities at the Portfolio's cost plus
                      interest within a specified period (normally one day). In
                      these transactions, the securities purchased by the
                      Portfolio will have a total value equal to, or in excess
                      of, the value of the repurchase agreement, and will be
                      held by the Fund's Custodian Bank until repurchased.
    
 
                      The use of repurchase agreements involves certain risks.
                      For example, if the seller of the agreement defaults on
                      its obligation to repurchase the underlying securities at
                      a time when the value of these securities has declined,
                      the Portfolio may incur a loss upon disposition of them.
                      If the seller of the agreement becomes insolvent and
                      subject to liquidation or reorganization under the
                      bankruptcy code or other laws, a bankruptcy court may
                      determine that the underlying securities are collateral
                      not within the control of the Portfolio and therefore
                      subject to sale by the trustee in bankruptcy. Finally, it
                      is possible that the Portfolio may not be able to
                      substantiate its interest in the underlying securities.
                      While the Fund's management acknowledges these risks, it
                      is expected that they can be controlled through stringent
                      security selection and careful monitoring.
 
THE PRIME PORTFOLIO
MAY INVEST IN
EURODOLLAR OR YANKEE
OBLIGATIONS           Eurodollar bank obligations are dollar-denominated
                      certificates of deposit and time deposits issued outside
                      the U.S. capital markets by foreign branches of U.S. banks
                      and by foreign banks. Yankee bank obligations are
                      dollar-denominated obligations issued in the U.S. capital
                      markets by foreign banks.
 
                      Eurodollar and Yankee obligations are subject to the same
                      risks that pertain to domestic issues, notably credit
                      risk, market risk and liquidity risk. Additionally,
                      Eurodollar (and to a limited extent, Yankee) obligations
                      are subject to certain
 
                                        9
<PAGE>   40
 
                      sovereign risks. One such risk is the possibility that a
                      foreign government might prevent dollar-denominated funds
                      from flowing across its borders. Other risks include:
                      adverse political and economic developments in a foreign
                      country; the extent and quality of government regulation
                      of financial markets and institutions; the imposition of
                      foreign withholding taxes; and expropriation or
                      nationalization of foreign issuers. However, Eurodollar
                      and Yankee obligations will undergo the same credit
                      analysis as domestic issues in which the Prime Portfolio
                      invests, and foreign issuers will be required to meet the
                      same tests of financial strength as the domestic issuers
                      approved for the Prime Portfolio.
 
PORTFOLIO TURNOVER
WILL BE HIGH
                      Each Portfolio of the Fund is expected to have a high
                      portfolio turnover rate due to the short maturities of the
                      securities purchased. However, this high turnover rate
                      should not increase the Fund's costs since brokerage
                      commissions are not normally charged on the purchase or
                      sale of money market instruments.
- --------------------------------------------------------------------------------
 
INVESTMENT
LIMITATIONS
THE FUND HAS ADOPTED
CERTAIN FUNDAMENTAL
LIMITATIONS
                      Each Portfolio of the Fund has adopted certain limitations
                      designed to reduce its risk exposure. These limitations
                      include the following:
 
                      (a) A Portfolio will not invest more than 5% of its assets
                          in the securities of any single company, excluding
                          obligations of the United States Government.
 
                      (b) A Portfolio will not purchase more than 10% of any
                          class of securities of any issuer.
 
                      (c) A Portfolio will not invest more than 25% of its
                          assets in any one industry, excluding obligations of
                          the United States Government or certificates of
                          deposit or bankers' acceptances of domestic
                          institutions.
 
                      (d) A Portfolio will not borrow money except for emergency
                          purposes and then not in excess of 15% of total
                          assets.
 
                      These investment limitations are considered at the time
                      investment securities are purchased. The limitations
                      described here and in the Statement of Additional
                      Information may be changed only with the approval of a
                      majority of the Fund's shareholders.
- --------------------------------------------------------------------------------
 
   
MANAGEMENT
OF THE FUND
VANGUARD ADMINISTERS
AND DISTRIBUTES THE
FUND
                      The Fund is a member of The Vanguard Group of Investment
                      Companies, a family of more than 30 investment companies
                      with more than 80 distinct investment portfolios and total
                      assets in excess of $130 billion. Through their
                      jointly-owned subsidiary, The Vanguard Group, Inc.
                      ("Vanguard"), the Fund and the other funds in the Group
                      obtain at cost virtually all of their corporate
                      management, administrative, shareholder accounting and
                      distribution services. Vanguard also provides investment
                      advisory services on an at-cost basis to certain Vanguard
                      funds. As a result of Vanguard's unique corporate
                      structure, the Vanguard funds have costs substantially
                      lower than those of most competing mutual funds. In 1994,
                      the average expense ratio (annual costs including advisory
                      fees divided by total net assets) for the Vanguard funds
                      amounted to approximately .30% compared to an average of
                      1.05% for the mutual fund industry (data provided by
                      Lipper Analytical Services).
    
 
                      The Officers of the Fund manage its day-to-day operations
                      and are responsible to the Fund's Board of Directors. The
                      Directors set broad policies for the Fund and
 
                                       10
<PAGE>   41
 
                      choose its Officers. A list of the Directors and Officers
                      of the Fund and a statement of their present positions and
                      principal occupations during the past five years can be
                      found in the Statement of Additional Information.
 
                      Vanguard employs a supporting staff of management and
                      administrative personnel needed to provide the requisite
                      services to the funds and also furnishes the funds with
                      necessary office space, furnishings and equipment. Each
                      fund pays its share of Vanguard's total expenses, which
                      are allocated among the funds under methods approved by
                      the Board of Directors (Trustees) of each fund. In
                      addition, each fund bears its own direct expenses, such as
                      legal, auditing and custodian fees.
 
                      Vanguard also provides distribution and marketing services
                      to the Vanguard funds. The funds are available on a
                      no-load basis (i.e., there are no sales commissions or
                      12b-1 fees). However, each fund bears its share of the
                      Group's distribution costs.
- --------------------------------------------------------------------------------
 
   
INVESTMENT
ADVISER
VANGUARD MANAGES THE
FUND'S INVESTMENTS    The three Portfolios of the Fund receive all investment
                      advisory services on an at-cost basis from Vanguard's
                      Fixed Income Group. The Group also provides investment
                      advisory services to more than 40 Vanguard money market
                      and bond portfolios, both taxable and tax-exempt. Total
                      assets under management by Vanguard's Fixed Income Group
                      were $55 billion as of December 31, 1994. The Fixed Income
                      Group is supervised by the Officers of the Fund. Ian A.
                      MacKinnon, Senior Vice President of Vanguard, has been in
                      charge of the Group since its inception in 1981.
    
 
                      The Fixed Income Group manages the investment and
                      reinvestment of the assets of the Fund's Portfolios and
                      continuously reviews, supervises and administers each
                      Portfolio's investment program, subject to the maturity
                      and quality standards specified in this Prospectus and
                      supplemental guidelines approved by the Fund's Board of
                      Directors. The Fixed Income Group's selection of
                      investments for the Portfolios is based on: (a) continuing
                      credit analysis of those instruments held in the
                      Portfolios and those being considered for inclusion
                      therein; (b) possible disparities in yield relationships
                      between different money market instruments; and (c) actual
                      or anticipated movements in the general level of interest
                      rates.
 
                      The Fixed Income Group is also responsible for the
                      allocation of principal business and portfolio brokerage
                      and the negotiation of commissions. The purchase and sale
                      of investment securities by the Fund will ordinarily be
                      principal transactions. Portfolio securities will normally
                      be purchased directly from the issuer or from an
                      underwriter or market maker for the securities. There
                      usually will be no brokerage commissions paid by a
                      Portfolio for securities purchased from an issuer.
                      Purchases from underwriters of securities will include a
                      commission or concession paid by the issuer to the
                      underwriter, and purchases from dealers serving as market
                      makers will include a dealer's mark-up.
 
                      In purchasing and selling securities for each of the
                      Portfolios, it is the Fund's policy to seek to obtain
                      quality execution at the most favorable prices through
                      issuers or responsible broker-dealers. In selecting
                      broker-dealers to execute the securities transactions for
                      the Portfolios, consideration will be given to such
                      factors as: the price of the security; the rate of the
                      commission; the size and difficulty of the order; the
                      reliability, integrity, financial condition, general
                      execution and operational
 
                                       11
<PAGE>   42
 
                      capabilities of competing broker-dealers; and the overall
                      brokerage and research services provided to the Fund.
- --------------------------------------------------------------------------------
 
DIVIDENDS AND
TAXES
DIVIDENDS ARE PAID ON
THE FIRST BUSINESS DAY
OF EACH MONTH         Each Portfolio's dividends are accrued daily based on
                      ordinary income and are distributed on the first business
                      day of the month. A Portfolio's dividends may be
                      automatically reinvested in additional shares or received
                      in cash. All dividend distributions are automatically
                      reinvested in additional shares of a Portfolio. Each
                      Portfolio of the Fund intends to continue to qualify as a
                      "regulated investment company" under the Internal Revenue
                      Code so that it will not be subject to federal income tax
                      to the extent its income is distributed to its
                      shareholders.
 
                      If you utilize the Fund as an investment option in an
                      employer-sponsored retirement savings plan, dividend
                      distributions from the Fund will generally not be subject
                      to current taxation, but will accumulate on a tax-deferred
                      basis. In general, employer-sponsored retirement and
                      savings plans are governed by complex tax rules. If you
                      participate in such a plan, consult your plan
                      administrator, your plan's Summary Plan Description, or a
                      professional tax adviser regarding the tax consequences of
                      your participation in the plan and of any plan
                      contributions or withdrawals.
- --------------------------------------------------------------------------------
 
THE SHARE PRICE OF
EACH PORTFOLIO        Each Portfolio's share price or "net asset value" per
                      share is calculated daily at the close of trading on the
                      New York Stock Exchange (generally 4:00 p.m. Eastern
                      time). Each Portfolio determines its net asset value per
                      share by subtracting the Portfolio's liabilities
                      (including accrued expenses and dividends payable) from
                      the total value of the Portfolio's investments and other
                      assets and by dividing the result by the total outstanding
                      shares of the Portfolio.
 
                      For the purpose of calculating each Portfolio's net asset
                      value per share, securities are valued by the "amortized
                      cost" method of valuation, which does not take into
                      account unrealized gains or losses. This involves valuing
                      an instrument at its cost and thereafter assuming a
                      constant amortization to maturity of any discount or
                      premium, regardless of the impact of fluctuating interest
                      rates on the market value of the instrument. While this
                      method provides certainty in valuation, it may result in
                      periods during which value, as determined by amortized
                      cost, is higher or lower than the price the Portfolio
                      would receive if it sold the instrument.
 
                      The use of amortized cost and the maintenance of each
                      Portfolio's per share net asset value at $1.00 is based on
                      its election to operate under the provisions of Rule 2a-7
                      under the Investment Company Act of 1940. As a condition
                      of operating under that rule, each Portfolio must maintain
                      a dollar-weighted average portfolio maturity of 90 days or
                      less, purchase only instruments having remaining
                      maturities of 13 months or less, and invest only in
                      securities that are determined by the Directors to present
                      minimal credit risks and that are of high quality as
                      determined by any major rating service, or in the case of
                      any instrument not so rated, considered by the Directors
                      to be of comparable quality.
 
   
                      The Directors have established procedures reasonably
                      designed to stabilize the net asset value per share as
                      computed for the purposes of sales and redemptions at
    
 
                                       12
<PAGE>   43
 
                      $1.00. These procedures include periodic review, as the
                      Directors deem appropriate and at such intervals as are
                      reasonable in light of current market conditions, of the
                      relationship between the amortized cost value per share
                      and a net asset value per share based upon available
                      indications of market value. In such a review, investments
                      for which market quotations are readily available are
                      valued at the most recent bid price or quoted yield
                      equivalent for such securities or for securities of
                      comparable maturity, quality and type as obtained from one
                      or more of the major market makers for the securities to
                      be valued. Other investments and assets are valued at fair
                      value, as determined in good faith by the Directors.
 
   
                      In the event of a deviation of over 1/2 of 1% between a
                      Portfolio's net asset value based upon available market
                      quotations or market equivalents and $1.00 per share based
                      on amortized cost, the Directors will promptly consider
                      what action, if any, should be taken. The Directors will
                      also take such action as they deem appropriate to
                      eliminate or to reduce, to the extent reasonably
                      practicable, any material dilution or other unfair results
                      to investors or existing shareholders which might arise
                      from differences between the two. Such action may include
                      redeeming shares in kind, selling instruments prior to
                      maturity to realize capital gains or losses or to shorten
                      average maturity, withholding dividends, paying
                      distributions from capital or capital gains, or utilizing
                      a net asset value per share based upon available market
                      quotations.
    
- --------------------------------------------------------------------------------
 
GENERAL
INFORMATION           The Fund, formerly known as "Whitehall Money Market
                      Trust," and then as "Vanguard Money Market Trust, Inc.,"
                      is a Maryland corporation. The Fund's Articles of
                      Incorporation permit the Directors to issue 35,000,000,000
                      shares of common stock, with a $.001 par value. The Board
                      of Directors has the power to designate one or more
                      classes ("Portfolios") of shares of common stock and to
                      classify or reclassify any unissued shares with respect to
                      such Portfolios. Currently the Fund is offering shares of
                      three Portfolios.
 
                      The shares of each Portfolio are fully paid and
                      non-assessable; have no preference as to conversion,
                      exchange, dividends, retirement or other features; and
                      have no pre-emptive rights. The shares of each Portfolio
                      have non-cumulative voting rights, meaning that the
                      holders of more than 50% of the shares voting for the
                      election of Directors can elect 100% of the Directors if
                      they choose to do so.
 
                      Annual meetings of shareholders will not be held except as
                      required by the Investment Company Act of 1940 and other
                      applicable law. An annual meeting will be held on the
                      removal of a Director or Directors of the Fund if
                      requested in writing by holders of not less than 10% of
                      the outstanding shares of the Fund.
 
   
                      CoreStates Bank, N.A., Philadelphia, PA, has been retained
                      to act as Custodian of the assets of each Portfolio of
                      the Fund. The Vanguard Group, Inc., Valley Forge, PA,
                      serves as the Fund's Transfer and Dividend Disbursing
                      Agent. Price Waterhouse LLP, serves as independent
                      accountants for the Fund and will audit its financial
                      statements annually. The Fund is not involved in any
                      litigation.
    
- --------------------------------------------------------------------------------
 
                                       13
<PAGE>   44
 
                                 SERVICE GUIDE
 
PARTICIPATING IN
YOUR PLAN             One or more Portfolios of the Fund is available as an
                      investment option in your retirement or savings plan. The
                      administrator of your plan or your employee benefits
                      office can provide you with detailed information on how to
                      participate in your plan and how to elect a Portfolio of 
                      the Fund as an investment option.
 
                      If you have any questions about a Portfolio, including the
                      Portfolio's investment objective, policies, risk
                      characteristics or historical performance, please contact
                      Participant Services at 1-800-523-1188.
 
                      If you have questions about your account, contact your
                      plan administrator or the organization which provides
                      recordkeeping services for your plan.
- --------------------------------------------------------------------------------
 
INVESTMENT OPTIONS
AND ALLOCATIONS       You may be permitted to elect different investment
                      options, alter the amounts contributed to your plan, or
                      change how contributions are allocated among your
                      investment options in accordance with your plan's specific
                      provisions. See your plan administrator or employee
                      benefits office for more details.
- --------------------------------------------------------------------------------
 
TRANSACTIONS IN
FUND SHARES           Contributions, exchanges or redemptions of a Portfolio's
                      shares are effective when received in "good order" by
                      Vanguard. "Good order" means that complete information on
                      the contribution, exchange or redemption and the
                      appropriate monies have been received by Vanguard.
- --------------------------------------------------------------------------------
 
MAKING EXCHANGES      Your plan may allow you to exchange monies from one
                      investment option to another. Check with your plan 
                      administrator for details on the rules governing 
                      exchanges in your plan. Certain investment options,  
                      particularly company stock or guaranteed investment 
                      contracts (GICs), may be subject to unique restrictions.
 
                      Before making an exchange, you should consider the
                      following:
 
                      - If you are making an exchange to another Vanguard Fund
                        option, please read the Fund's prospectus. Contact
                        Participant Services at 1-800-523-1188 for a copy.
 
                      - Exchanges are accepted by Vanguard only as permitted by
                        your plan. Your plan administrator can explain how
                        frequently exchanges are allowed.
- --------------------------------------------------------------------------------
 
                                       14
<PAGE>   45
 
                     (THIS PAGE INTENTIONALLY LEFT BLANK.)
<PAGE>   46
 
- --------------------------------------------------------------------------------
[LOGO] 
   
- ---------------------------                            [LOGO]
THE VANGUARD GROUP                                           
  OF INVESTMENT                              I N S T I T U T I O N A L  
  COMPANIES                                     P R O S P E C T U S     
Institutional Division
P.O. Box 2900                                      MARCH 17, 1995
Vanguard Financial Center
Valley Forge, PA 19482

PARTICIPANT SERVICES:
1-800-523-1188
                                                       [LOGO]
I030
    
 
- --------------------------------------------------------------------------------
<PAGE>   47
 
                                     PART B
 
                         VANGUARD MONEY MARKET RESERVES
 
                      STATEMENT OF ADDITIONAL INFORMATION
 
   
                                 MARCH 17, 1995
    
 
   
     This Statement is not a prospectus but should be read in conjunction with
the Fund's current Prospectus (dated March 17, 1995). To obtain the Prospectus
please call the Investor Information Department:
    
 
                                 1-800-662-7447
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                            PAGE
                                                                                            ----
<S>                                                                                         <C>
Investment Limitations....................................................................     1
Yield and Total Return....................................................................     2
Calculation of Yield......................................................................     3
Purchase of Shares........................................................................     3
Redemption of Shares......................................................................     4
Shareholder Services......................................................................     4
Performance Measures......................................................................     5
Management of the Fund....................................................................     7
Description of Shares and Voting Rights...................................................     9
Financial Statements......................................................................    10
Appendix--Description of Securities and Ratings...........................................    10
</TABLE>
 
                             INVESTMENT LIMITATIONS
 
     The following restrictions and fundamental policies cannot be changed
without approval of the holders of a majority of the outstanding shares of the
Fund (as defined in the Investment Company Act of 1940), including a majority of
the shares of each Portfolio. The Fund may not under any circumstances:
 
      1) purchase securities for any Portfolio of the Fund other than the
         securities in which the Portfolio is authorized to invest as set forth
         in the Prospectus under "Investment Objectives" and "Investment
         Policies";
 
      2) borrow money in excess of 15% of the total assets of any Portfolio
         taken at market value and then only from banks as a temporary measure
         for extraordinary or emergency purposes; the Fund will not borrow to
         increase income (leveraging) but only to facilitate redemption requests
         which might otherwise require untimely dispositions of portfolio
         securities; the Fund will repay all borrowings before making additional
         investments and interest paid on such borrowings will reduce net
         income;
 
      3) make loans to other persons (except by the purchase of obligations in
         which the Fund is authorized to invest); provided, however, that the
         Fund will not enter into repurchase agreements if, as a result thereof,
         more than 10% of the net assets of any Portfolio (taken at current
         value) would be subject to repurchase agreements maturing in more than
         seven days;
 
      4) purchase the securities of any issuer (other than obligations issued or
         guaranteed as to principal and interest by the Government of the United
         States, its agencies or instrumentalities) if, as a result, (a) more
         than 5% of a Portfolio's total assets (taken at current value) would be
         invested in the securities of such issuer, or (b) any Portfolio would
         hold more than 10% of any class of securities of such issuer (for this
         purpose, all debt obligations of an issuer maturing in less than one
         year are treated as a single class of securities);
 
      5) write, or invest in, put, call, straddle or spread options or invest in
         interests in oil, gas or other mineral exploration or development
         programs;
 
                                        1
<PAGE>   48
 
      6) purchase securities on margin or sell any securities short;
 
      7) purchase or retain securities of an issuer if an officer or director of
         such issuer is an officer or Director of the Fund or its investment
         adviser and one or more of such officers or directors (trustees) of the
         Fund or its investment adviser owns beneficially more than 1/2% of the
         shares of securities of such issuer and all such directors and officers
         owning more than 1/2% of such shares or securities together own more
         than 5% of such shares or securities;
 
      8) purchase any securities which could cause more than 25% of the value of
         a Portfolio's total net assets at the time of such purchase to be
         invested in the securities of one or more issuers conducting their
         principal business activities in the same industry, provided that there
         is no limitation with respect to investments in United States Treasury
         Bills, other obligations issued or guaranteed by the Federal
         Government, its agencies and instrumentalities or certificates of
         deposit or bankers' acceptances of domestic institutions;
 
      9) mortgage, pledge or hypothecate its assets except in an amount up to
         15% (10% as long as the Fund's shares are registered for sale in
         certain states) of the value of a Portfolio's total assets but only to
         secure borrowings for temporary or emergency purposes;
 
     10) engage in the business of underwriting securities issued by other
         persons, except to the extent that the Portfolio may technically be
         deemed to be an underwriter under the Securities Act of 1933, as
         amended, in disposing of investment securities;
 
     11) purchase or otherwise acquire any security if, as a result, more than
         10% of its net assets (including any investment in The Vanguard Group
         Inc.) would be invested in securities that are illiquid;
 
     12) purchase or sell real estate, real estate investment trust securities,
         commodities, or commodity contracts;
 
     13) invest in companies for the purpose of exercising control;
 
     14) invest in securities of other investment companies, except as they may
         be acquired as part of a merger, consolidation or acquisition of
         assets; and
 
     15) issue senior securities.
 
     Notwithstanding these limitations, the Fund may own all or any portion of
the securities of, or make loans to, or contribute to the costs or other
financial requirements of, any company which will be: (1) wholly owned by the
Fund and one or more other investment companies, and is (2) primarily engaged in
the business of providing, at-cost, management, administrative, distribution or
related services to the Fund and other investment companies. See "Management of
the Fund."
 
     As an operational policy of the Fund, the Fund will not in the aggregate,
enter into repurchase agreements maturing in more than seven days, purchase
restricted securities or invest in any other illiquid securities if, as a result
thereof, more than 10% of the net assets of the Fund would be invested in such
assets.
 
     The above-mentioned investment limitations are considered at the time
investment securities are purchased.
 
                             YIELD AND TOTAL RETURN
 
   
     The yield of each Portfolio of the Fund for the 7-day period ended November
30, 1994 is set forth below. Yields are calculated daily for each Portfolio.
    
 
   
<TABLE>
    <S>                                                                                 <C>
    Prime Portfolio..................................................................   5.12%
    Federal Portfolio................................................................   5.03%
    U.S. Treasury Portfolio..........................................................   4.76%
</TABLE>
    
 
                                        2
<PAGE>   49
 
   
     The average annual total return of each Portfolio of the Fund for the one-,
five- and ten-year periods ending November 30, 1994 is set forth below:
    
 
   
<TABLE>
<CAPTION>
                                               1 YEAR ENDED     5 YEARS ENDED     10 YEARS ENDED
                                                 11/30/94         11/30/94           11/30/94
                                               ------------     -------------     --------------
    <S>                                        <C>              <C>               <C>
    Prime Portfolio..........................     + 3.87%           +5.09%            + 6.37%
    Federal Portfolio........................     + 3.82%           +4.98%            + 6.20%
    U.S. Treasury Portfolio..................     + 3.63%           +4.81%            + 5.95%*
</TABLE>
    
 
     Total return is computed by finding the average compounded rates of return
over the periods set forth above that would equate an initial amount invested at
the beginning of the periods to the ending redeemable value of the investment.
 
                              CALCULATION OF YIELD
 
     The current yield of each of the Fund's Portfolios is calculated daily on a
base period return of a hypothetical account having a beginning balance of one
share for a particular period of time (generally 7 days). The return is
determined by dividing the net change (exclusive of any capital changes) in such
account by its average net asset value for the period, and then multiplying it
by 365/7 to get the annualized current yield. The calculation of net change
reflects the value of additional shares purchased with the dividends by the
Portfolio, including dividends on both the original share and on such additional
shares. An effective yield, which reflects the effects of compounding and
represents an annualization of the current yield with all dividends reinvested,
may also be calculated for the Portfolio by adding 1 to the net change, raising
the sum to the 365/7 power, and subtracting 1 from the result.
 
   
     Set forth below is an example, for purposes of illustration only, of the
current and effective yield calculations for each of the Portfolios for the
7-day base period ended November 30, 1994.
    
 
   
<TABLE>
<CAPTION>
                                                                                                   U.S. TREASURY
                                                           PRIME PORTFOLIO    FEDERAL PORTFOLIO      PORTFOLIO
                                                           ---------------    -----------------    -------------
                                                              11/30/94            11/30/94           11/30/94
                                                           ---------------    -----------------    -------------
<S>                                                        <C>                <C>                  <C>
Value of account at beginning of period.................      $ 1.00000           $ 1.00000          $ 1.00000
Value of same account at end of period*.................        1.00098             1.00097            1.00092
                                                           ---------------    -----------------    -------------
Net Change in account value.............................      $  .00098           $  .00097          $  .00092
Annualized Current Net Yield (Net Change X 365/7)
  average net asset value...............................          5.12%               5.03%              4.76%
Effective Yield [(Net Change)+1]365/7-1.................          5.24%               5.19%              4.91%
Average Weighted Maturity of Investments................        38 Days             39 Days            38 Days
</TABLE>
    
 
- ---------------
*Exclusive of any capital changes.
 
     The net asset value of a share of each Portfolio is $1.00 and it is not
expected to fluctuate. However, the yield of each Portfolio will fluctuate. The
annualization of a week's dividend is not a representation by the Portfolio as
to what an investment in the Portfolio will actually yield in the future. Actual
yields will depend on such variables as investment quality, average maturity,
the type of instruments the Portfolio invests in, changes in interest rates on
instruments, changes in the expenses of the Fund and other factors. Yields are
one basis investors may use to analyze the Portfolios of the Fund, and other
investment vehicles; however, yields of other investment vehicles may not be
comparable because of the factors set forth in the preceding sentence,
differences in the time periods compared, and differences in the methods used in
valuing portfolio instruments, computing net asset values and calculating
yields.
 
                               PURCHASE OF SHARES
 
     The Fund reserves the right in its sole discretion (i) to suspend the
offerings of its shares, (ii) to reject purchase orders when in the judgment of
management such rejection is in the best interest of the Fund, and
 
                                        3
<PAGE>   50
 
(iii) to reduce or waive the minimum for initial and subsequent investments for
certain fiduciary accounts or under circumstances where certain economies can be
achieved in sales of the Fund's shares.
 
                              REDEMPTION OF SHARES
 
     The Fund may suspend redemption privileges for each Portfolio or postpone
the date of payment (i) during any period that the New York Stock Exchange is
closed, or trading on the Exchange is restricted as determined by the Securities
and Exchange Commission (the "Commission"), (ii) during any period when an
emergency exists as defined by the rules of the Commission as a result of which
it is not reasonably practicable for a Portfolio to dispose of securities owned
by it, or fairly to determine the value of its assets, and (iii) for such other
periods as the Commission may permit.
 
     The Fund has made an election with the Commission to pay in cash all
redemptions requested by any shareholder of record limited in amount during any
90-day period to the lesser of $250,000 or l% of the net assets of the Fund at
the beginning of such period. Such commitment is irrevocable without the prior
approval of the Commission. Redemptions in excess of the above limits may be
paid in whole or in part, in investment readily marketable securities or in
cash, as the Directors may deem advisable; however, payment will be made wholly
in cash unless the Directors believe that economic or market conditions exist
which would make such a practice detrimental to the best interests of the Fund.
If redemptions are paid in investment securities, such securities will be valued
as set forth in the Prospectus under "The Share Price of Each Portfolio" and a
redeeming shareholder would normally incur brokerage expenses if he converted
these securities to cash.
 
     No charge is made by the Fund for redemptions; except for wire withdrawals
in amounts less than $5,000 which will be subject to a maximum charge of $5.00
which will be deducted from the principal in your account. Any redemption may be
more or less than the shareholder's cost depending on the market value of the
securities held by each Portfolio.
 
                              SHAREHOLDER SERVICES
 
     EXCHANGE PRIVILEGE  Each Portfolio's shares may be exchanged without cost
for shares of any other Portfolio, or for the shares of any open-end Fund
currently offering its shares to new investors in The Vanguard Group
("Vanguard"). A shareholder of any other open-end Fund in Vanguard may likewise
exchange his shares for shares of any of the Fund's Portfolios. Exchange
requests may be made either by mail, telephone or telegraph.
 
   
     Telephone and telegraph exchanges (referred to as "expedited exchanges")
will be accepted only if the account of the shareholder and the registration of
the two accounts is identical. Requests for expedited exchanges received prior
to the close of the New York Stock Exchange (generally 4:00 P.M. Eastern time)
will be processed at the next determined net asset value after such request is
received. Requests received after the close of the New York Stock Exchange
(generally 4:00 P.M. Eastern time), will be processed on the next business day.
NO EXPEDITED EXCHANGES WILL BE ACCEPTED INTO, OR FROM, VANGUARD BALANCED INDEX
FUND, VANGUARD INDEX TRUST, VANGUARD QUANTITATIVE PORTFOLIOS AND VANGUARD
INTERNATIONAL EQUITY INDEX FUND. Neither the Fund nor Vanguard will be
responsible for the authenticity of exchange instructions received by telephone
or telegraph. Expedited exchanges may also be subject to limitations as to
amounts and frequency, and to other restrictions established by the Board of
Directors to assure that such exchanges do not disadvantage the Fund and its
shareholders. Shareholders may obtain the terms of these limitations, which may
be revised at any time, from Vanguard.
    
 
     Any such exchange will be based on the respective net asset values of the
shares involved. There are no sales commissions or charges of any kind. Before
making an exchange, a shareholder should consider the investment objectives and
policies of the Portfolio or Fund to be purchased, and other relevant
information (including the minimum initial investment), which can be found in
the prospectus relating to that particular Portfolio or Fund. A prospectus for
any of the Vanguard Funds or Portfolios may be obtained from Vanguard.
 
                                        4
<PAGE>   51
 
     For Federal income tax purposes an exchange between Funds is a taxable
event and, accordingly, a capital gain or loss may be realized. In a revenue
ruling relating to circumstances similar to the Fund's, an exchange between
series of a Fund was also deemed to be a taxable event. It is likely, therefore,
that a capital gain or loss would be realized on an exchange between Portfolios;
you may want to consult your tax adviser for further information in this regard.
The exchange privilege may be modified or terminated at any time, and any of the
Portfolios or Vanguard Funds may limit or discontinue the offering of its shares
without notice to shareholders.
 
     TRANSFER OF SHARES  Fund shares may be transferred to another person by
sending appropriate written instructions to Vanguard. The account must be
clearly identified and include the number of shares to be transferred and the
signatures of all registered owners. The signature on the letter of instructions
or any stock power must be guaranteed. As in the case of withdrawals, the
written request must be received in "Good Order" before any transfer can be
made.
 
     INFORMATION FOR SHAREHOLDERS  Following any purchase or redemption, a
shareholder will receive a statement which reflects all activity during the
current calendar year. Each shareholder will also receive a monthly statement,
which includes a valuation as of the day the statement is prepared.
 
     Shareholders will receive semi-annual financial statements audited at least
annually by independent accountants whose selection is ratified by shareholders.
 
                              PERFORMANCE MEASURES
 
     Vanguard Money Market Reserves may use one or more of the following
unmanaged indexes for comparative performance purposes:
 
STANDARD AND POOR'S 500 COMPOSITE STOCK PRICE INDEX -- is a well diversified
list of 500 companies representing the U.S. Stock Market.
 
   
WILSHIRE 5000 EQUITY INDEXES -- consists of more than 6,000 common equity
securities, covering all stocks in the U.S. for which daily pricing is
available.
    
 
WILSHIRE 4500 EQUITY INDEX -- consists of all stocks in the Wilshire 5000 except
for the 500 stocks in the Standard and Poor's 500 Index.
 
   
RUSSELL 3000 STOCK INDEX -- a diversified portfolio of approximately 3,000
common stocks accounting for over 90% of the market value of publicly traded
stocks in the U.S.
    
 
RUSSELL 2000 STOCK INDEX -- a subset of approximately 2,000 of the smallest
stocks contained in the Russell 3000; a widely used benchmark for small
capitalization common stocks.
 
MORGAN STANLEY CAPITAL INTERNATIONAL EAFE INDEX -- is an arithmetic, market
value-weighted average of the performance of over 900 securities listed on the
stock exchanges of countries in Europe, Australia and the Far East.
 
GOLDMAN SACHS 100 CONVERTIBLE BOND INDEX -- currently includes 67 bonds and 33
preferreds. The original list of names was generated by screening for
convertible issues of 100 million or greater in market capitalization. The index
is priced monthly.
 
SALOMON BROTHERS GNMA INDEX -- includes pools of mortgages originated by private
lenders and guaranteed by the mortgage pools of the Government National Mortgage
Association.
 
SALOMON BROTHERS HIGH-GRADE CORPORATE BOND INDEX -- consists of publicly issued,
non-convertible corporate bonds rated AA or AAA. It is a value-weighted, total
return index, including approximately 800 issues with maturities of 12 years or
greater.
 
   
LEHMAN LONG-TERM TREASURY BOND -- is composed of all bonds covered by the
Shearson Lehman Hutton Treasury Bond Index with maturities of 10 years or
greater.
    
 
MERRILL LYNCH CORPORATE & GOVERNMENT BOND -- consists of over 4,500 U.S.
Treasury, Agency and investment grade corporate bonds.
 
                                        5
<PAGE>   52
 
   
LEHMAN CORPORATE (BAA) BOND INDEX -- all publicly offered fixed-rate,
nonconvertible domestic corporate bonds rated Baa by Moody's, with a maturity
longer than 1 year and with more than $25 million outstanding. This index
includes over 1,000 issues.
    
 
   
BOND BUYER MUNICIPAL INDEX (20 YEAR) BOND -- is a yield index on current coupon
high-grade general obligation municipal bonds.
    
 
   
STANDARD & POOR'S PREFERRED INDEX -- is a yield index based upon the average
yield of four high-grade, non-callable preferred stock issues.
    
 
NASDAQ INDUSTRIAL INDEX -- is composed of more than 3,000 industrial issues. It
is a value-weighted index calculated on price change only and does not include
income.
 
COMPOSITE INDEX -- 70% Standard & Poor's 500 Index and 30% NASDAQ Industrial
Index.
 
COMPOSITE INDEX -- 35% Standard & Poor's 500 Index and 65% Salomon Brothers
High-Grade Bond Index.
 
COMPOSITE INDEX -- 65% Standard & Poor's 500 Index and 35% Salomon Brothers
High-Grade Bond Index.
 
LEHMAN BROTHERS AGGREGATE BOND INDEX -- is a market weighted index that contains
individually priced U.S. Treasury, agency, corporate, and mortgage pass-through
securities corporate rated BBB- or better. The Index has a market value of over
$4 trillion.
 
LEHMAN BROTHERS MUTUAL FUND SHORT (1-5) GOVERNMENT/CORPORATE INDEX -- is a
market weighted index that contains individually priced U.S. Treasury, agency,
and corporate investment grade bonds rated BBB- or better with maturities
between 1 and 5 years. The index has a market value of over $1.3 trillion.
 
LEHMAN BROTHERS MUTUAL FUND INTERMEDIATE (5-10) GOVERNMENT/CORPORATE INDEX -- is
a market weighted index that contains individually priced U.S. Treasury, agency,
and corporate securities rated BBB- or better with maturities between 5 and 10
years. The index has a market value of over $600 billion.
 
LEHMAN BROTHERS MUTUAL FUND LONG (10+) GOVERNMENT/CORPORATE INDEX -- is a market
weighted index that contains individually priced U.S. Treasury, agency, and
corporate securities rated BBB- or better with maturities greater than 10 years.
The index has a market value of over $900 billion.
 
LIPPER SMALL COMPANY GROWTH FUND AVERAGE -- the average performance of small
company growth funds as defined by Lipper Analytical Services, Inc. Lipper
defines a small company growth fund as a fund that by prospectus or portfolio
practice, limits its investments to companies on the basis of the size of the
company. From time to time, Vanguard may advertise using the average performance
and/or the average expense ratio of the small company growth funds. (This fund
category was first established in 1982. For years prior to 1982, the results of
the Lipper Small Company Growth category were estimated using the returns of the
Funds that constituted the Group at its inception.)
 
LIPPER BALANCED FUND AVERAGE -- An industry benchmark of average balanced funds
with similar investment objectives and policies, as measured by Lipper
Analytical Services, Inc.
 
LIPPER NON-GOVERNMENT MONEY MARKET FUND AVERAGE -- An industry benchmark of
average non-government money market funds with similar investment objectives and
policies, as measured by Lipper Analytical Services, Inc.
 
LIPPER GOVERNMENT MONEY MARKET FUND AVERAGE -- An industry benchmark of average
government money market funds with similar investment objectives and policies,
as measured by Lipper Analytical Services, Inc.
 
                                        6
<PAGE>   53
 
                             MANAGEMENT OF THE FUND
 
OFFICERS AND DIRECTORS
 
   
     The Fund's Officers, under the supervision of the Board of Directors,
manage the day-to-day operations of the Fund. The Directors, who are elected
annually by shareholders, set broad policies for the Fund and choose its
Officers. A list of the Directors and Officers of the Fund and a brief statement
of their present positions and principal occupations during the past 5 years is
set forth below. The mailing address of the Directors and Officers of the Fund
is Post Office Box 876, Valley Forge, PA 19482.
    
 
JOHN C. BOGLE, Chairman, Chief Executive Officer and Director*
     Chairman, Chief Executive Officer, and Director of The Vanguard Group,
     Inc., and of each of the investment companies in The Vanguard Group.
     Director of The Mead Corporation and General Accident Insurance.
 
JOHN J. BRENNAN, President & Director*
     President and Director of The Vanguard Group, Inc. and each of the
     investment companies in The Vanguard Group.
 
ROBERT E. CAWTHORN, Director
   
     Chairman of Rhone-Poulenc Rorer, Inc.; Director of Sun Company, Inc.
    
 
BARBARA BARNES HAUPTFUHRER, Director
   
     Director of The Great Atlantic and Pacific Tea Company, Alco Standard
     Corp., Raytheon Company, Knight-Ridder Inc., and Massachusetts Mutual Life
     Insurance Co. and Trustee Emerita of Wellesley College.
    
 
BRUCE K. MACLAURY, Director
   
     President, The Brookings Institution; Director of American Express Bank,
     Ltd., The St. Paul Companies, Inc. and Scott Paper Company.
    
 
BURTON G. MALKIEL, Director
   
     Chemical Bank Chairman's Professor of Economics, Princeton University;
     Director of Prudential Insurance Co. of America, Amdahl Corporation, Baker
     Fentress & Co., The Jeffrey Co., and Southern New England Communications
     Company.
    
 
ALFRED M. RANKIN, JR., Director
   
     Chairman, President, and Chief Executive Officer of NACCO Industries, Inc.;
     Director of The BFGoodrich Company, The Standard Products Company and The
     Reliance Electric Company.
    
 
JOHN C. SAWHILL, Director
     President and Chief Executive Officer, of The Nature Conservancy; formerly,
     Director and Senior Partner, McKinsey & Co.; President, New York
     University; Director of Pacific Gas and Electric Company and NACCO
     Industries.
 
JAMES O. WELCH, JR., Director
     Retired Chairman of Nabisco Brands Inc., retired Vice Chairman and Director
     of RJR Nabisco; Director of TECO Energy, Inc.
 
J. LAWRENCE WILSON, Director
   
     Chairman and Chief Executive Officer, Rohm & Haas Company; Director of
     Cummins Engine Company, Trustee of Vanderbilt University and the Culver
     Educational Foundation.
    
 
RAYMOND J. KLAPINSKY, Secretary*
     Senior Vice President and Secretary of The Vanguard Group, Inc.; Secretary
     of each of the investment companies in The Vanguard Group.
 
RICHARD F. HYLAND, Treasurer*
     Treasurer of The Vanguard Group, Inc. and of each of the investment
     companies in The Vanguard Group.
 
KAREN E. WEST, Controller*
     Vice President of The Vanguard Group, Inc.; Controller of each of the
     investment companies in The Vanguard Group.
- ---------------
 
*Officers of the Fund are "interested persons" as defined in the Investment
 Company Act of 1940.
 
THE VANGUARD GROUP
 
   
     The Fund is a member of The Vanguard Group of Investment Companies. Through
their jointly-owned subsidiary, The Vanguard Group, Inc. ("Vanguard"), the Fund
and the other Funds in the Group obtain at cost
    
 
                                        7
<PAGE>   54
 
virtually all of their corporate management, administrative and distribution
services. Vanguard also provides investment advisory services on an at-cost
basis to certain of the Vanguard Funds.
 
     Vanguard employs a supporting staff of management and administrative
personnel needed to provide the requisite services to the Funds and also
furnishes the Funds with necessary office space, furnishings and equipment. Each
Fund pays its share of Vanguard's total expenses which are allocated among the
Funds under methods approved by the Board of Directors (Trustees) of each Fund.
In addition, each Fund bears its own direct expenses such as legal, auditing and
custodian fees.
 
     The Fund's Officers are also Officers and employees of Vanguard. No Officer
or employee owns, or is permitted to own, any securities of any external adviser
for the Funds.
 
   
     The Vanguard Group adheres to a Code of Ethics established pursuant to Rule
17j-I under the Investment Company Act of 1940. The Code is designed to prevent
unlawful practices in connection with the purchase or sale of securities by
persons associated with Vanguard. Under Vanguard's Code of Ethics certain
officers and employees of Vanguard who are considered access persons are
permitted to engage in personal securities transactions. However, such
transactions are subject to procedures and guidelines substantially similar to
those recommended by the mutual fund industry and approved by the U.S.
Securities and Exchange Commission.
    
 
   
     The Vanguard Group, Inc. ("Vanguard") was established and operates under a
Funds' Service Agreement which was approved by the shareholders of each of the
Funds. The amounts of which each of the Funds have invested are adjusted from
time to time in order to maintain the proportionate relationship between each
Fund's relative net assets and its contribution to Vanguard's capital. At
November 30, 1994, the Fund had contributed capital of $2,852,000 to Vanguard,
representing 14.3% of Vanguard's capitalization. The Fund's service agreement
was amended on May 10, 1993, to provide as follows: (a) each Vanguard Fund may
invest up to 0.40% of its current assets in Vanguard and (b) there is no other
limitation on the amount that each Vanguard Fund may contribute to Vanguard's
Capitalization.
    
 
   
     MANAGEMENT  Corporate management and administrative services include: (1)
executive staff; (2) accounting and financial; (3) legal and regulatory; (4)
shareholder account maintenance; (5) monitoring and control of custodian
relationships; (6) shareholder reporting; and (7) review and evaluation of
advisory and other services provided to the Funds by third parties. During the
fiscal year ended November 30, 1994, the Fund's share of Vanguard's actual net
costs of operation relating to management and administrative services (including
transfer agency) totaled approximately $45,903,000.
    
 
     DISTRIBUTION  Vanguard provides all distribution and marketing activities
for the Funds in the Group. Vanguard Marketing Corporation, a wholly-owned
subsidiary of The Vanguard Group, Inc., acts as Sales Agent for the shares of
the Funds, in connection with any sales made directly to investors in the states
of Florida, Missouri, New York, Ohio, Texas and such other states as it may be
required.
 
     The principal distribution expenses are for advertising, promotional
materials and marketing personnel. Distribution services may also include
organizing and offering to the public, from time to time, one or more new
investment companies which will become members of the Group. The Directors and
Officers of Vanguard determine the amount to be spent annually on distribution
activities, the manner and amount to be spent on each Fund, and whether to
organize new investment companies.
 
   
     One half of the distribution expenses of a marketing and promotional nature
is allocated among the Funds based upon relative net assets. The remaining one
half of those expenses is allocated among the Funds based upon each Fund's sales
for the preceding 24 months relative to the total sales of the Funds as a Group,
provided, however, that no Fund's aggregate quarterly rate of contribution for
distribution expenses of a marketing and promotional nature shall exceed 125% of
average distribution expense rate for the Group, and that no Fund shall incur
annual distribution expenses in excess of 20/100 of 1% of its average month-end
net assets. During the fiscal year ended November 30, 1994, the Fund paid
approximately $4,617,000 of the Group's distribution and marketing expenses or
3/100 of 1% of the Fund's average month-end net assets.
    
 
                                        8
<PAGE>   55
 
   
     INVESTMENT ADVISORY SERVICES  Vanguard also provides the Fund, Vanguard
Municipal Bond Fund, Vanguard Bond Index Fund, Vanguard Institutional Money
Market Portfolio, several Portfolios of Vanguard Fixed Income Securities Fund,
Vanguard Admiral Funds, Vanguard California Tax-Free Fund, Vanguard Pennsylvania
Tax-Free Fund, Vanguard Ohio Tax-Free Fund, Vanguard New York Insured Tax-Free
Fund, Vanguard New Jersey Tax-Free Fund, Vanguard Florida Insured Tax-Free Fund,
Vanguard Index Trust, Vanguard Balanced Index Fund, Vanguard Institutional Index
Fund, Vanguard Tax-Managed Fund, several Portfolios of Vanguard Variable
Insurance Fund, Vanguard International Equity Index Fund, a portion of
Vanguard/Windsor II, a portion of Vanguard/Morgan Growth Fund as well as several
indexed separate accounts with investment advisory services. These services are
provided on an at-cost basis from a money management staff employed directly by
Vanguard. The compensation and other expenses of this staff are paid by the
Funds utilizing these services. During the years ended November 30, 1992, 1993
and 1994, the Fund paid approximately $1,532,000, $1,603,000, and $1,896,000
respectively, of Vanguard's expenses relating to investment advisory services.
    
 
   
     REMUNERATION OF DIRECTORS  The Fund pays each Director (Trustee), who is
not also an Officer, an annual fee plus travel and other expenses incurred in
attending Board meetings. The Fund's Officers and employees are paid by Vanguard
which, in turn, is reimbursed by the Fund and each other Fund in the Group, for
its proportionate share of Officers' and employees' salaries and retirement
benefits.
    
 
   
     The following information is furnished with respect to the Directors and
Officers of the Fund for whom the Fund's proportionate shares of remuneration
exceeded $60,000 for the fiscal year ended November 30, 1994, and for all
Directors:
    
 
   
                         VANGUARD MONEY MARKET RESERVES
    
   
                               COMPENSATION TABLE
    
 
   
<TABLE>
<CAPTION>
                                AGGREGATE       PENSION OR RETIREMENT        ESTIMATED          TOTAL COMPENSATION
                               COMPENSATION      BENEFITS ACCRUED AS      ANNUAL BENEFITS     FROM ALL VANGUARD FUNDS
    NAMES OF DIRECTORS          FROM FUND       PART OF FUND EXPENSES     UPON RETIREMENT      PAID TO DIRECTORS(2)
- ---------------------------    ------------     ---------------------     ---------------     -----------------------
<S>                            <C>              <C>                       <C>                 <C>
John C. Bogle(1)                 $387,407              $    --                     --                      --
John J. Brennan(1)               $191,762              $    --                     --                      --
Barbara Barnes Hauptfuhrer       $  9,273              $ 1,934                $15,000                 $50,000
Robert E. Cawthorn               $  9,273              $ 1,611                $13,000                 $50,000
Bruce K. MacLaury                $ 10,424              $ 1,611                $12,000                 $54,650
Burton G. Malkiel                $  9,273              $ 1,289                $15,000                 $50,000
Alfred M. Rankin, Jr.            $  9,273              $ 1,018                $15,000                 $50,000
John C. Sawhill                  $  9,273              $ 1,209                $15,000                 $50,000
James O. Welch, Jr.              $  8,892              $ 1,487                $15,000                 $48,000
J. Lawrence Wilson               $  9,082              $ 1,074                $15,000                 $49,000
</TABLE>
    
 
   
(1)As "Interested Directors," Messrs. Bogle and Brennan receive no compensation
   for their service as Directors. Compensation amounts reported for Messrs.
   Bogle and Brennan relate to their respective positions as Chief Executive
   Officer and President of the Fund.
    
   
(2)The amounts reported in this column reflect the total compensation paid to
   each Director for their service as Director or Trustee of 33 Vanguard Funds
   (26 in the case of Mr. MacLaury).
    
 
     Under its retirement plan, Vanguard contributes annually an amount equal to
10% of each eligible Officer's annual compensation plus 5.7% of that part of an
eligible Officer's compensation during the year, if any, that exceeds the Social
Security Taxable Wage Base then in effect. Under the Thrift Plan, all eligible
Officers are permitted to make pre-tax basic contributions in a maximum amount
equal to 4% of total compensation which are matched by Vanguard on a 100% basis.
Directors who are not Officers are paid an annual fee based on the number of
years of service on the board, up to fifteen years of service, upon retirement.
The fee is equal to $1,000 for each year of service and each investment company
member of The Vanguard Group contributes a proportionate amount of this fee
based on its relative net assets. This fee is paid, subsequent to a Director's
retirement, for a period of ten years or until the death of a retired Director.
 
                                        9
<PAGE>   56
 
                    DESCRIPTION OF SHARES AND VOTING RIGHTS
 
     The Articles of Incorporation, as amended and restated, permit the
Directors to issue 35,000,000,000 shares of common stock, with a $.001 par
value. The Board of Directors has the power to designate one or more classes
("Portfolios") of shares of common stock and to classify or reclassify any
unissued shares with respect to such Portfolios. Currently the Fund is offering
shares of three Portfolios.
 
     The shares of each Portfolio are fully paid and nonassessable, and have no
preference as to conversion, exchange, dividends, retirement or other features.
The shares of each Portfolio have no pre-emptive rights. The shares of each
Portfolio have non-cumulative voting rights, which means that the holders of
more than 50% of the shares voting for the election of Directors can elect 100%
of the Directors if they choose to do so. A shareholder is entitled to one vote
for each full share held (and a fractional vote for each fractional share held),
then standing in his name on the books of the Fund. On any matter submitted to a
vote of shareholders, all shares of the Fund then issued and outstanding and
entitled to vote, irrespective of the class, shall be voted in the aggregate and
not by class: except (i) when required by the Investment Company Act of 1940,
shares shall be voted by individual class; and (ii) when the matter does not
affect any interest of a particular class, then only shareholders of the
affected class or classes shall be entitled to vote thereon.
 
                              FINANCIAL STATEMENTS
 
   
     The Fund's financial statements for the year ended November 30, 1994,
including the financial highlights for each of the five fiscal years in the
period ended November 30, 1994, appearing in the Fund's 1994 Annual Report to
Shareholders, and the report thereon of Price Waterhouse LLP, independent
accountants, also appearing therein, are incorporated by reference in this
Statement of Additional Information. The Fund's Annual Report to Shareholders is
enclosed with this Statement of Additional Information.
    
 
               APPENDIX -- DESCRIPTION OF SECURITIES AND RATINGS
 
A-1 AND PRIME-1 COMMERCIAL PAPER RATINGS
 
     Commercial paper rated A-1 by Standard & Poor's has the following
characteristics: (1) liquidity ratios are adequate to meet cash requirements;
(2) long-term senior debt is rated "A" or better; (3) the issuer has access to
at least two additional channels of borrowing; (4) basic earnings and cash flow
have an upward trend with allowance made for unusual circumstances; (5)
typically, the issuer's industry is well established and the issuer has a strong
position within the industry; and (6) the reliability and quality of management
are unquestioned. Relative strength or weakness of the above factors determine
whether the issuer's commercial paper is A-1, A-2, or A-3. The rating Prime-1 is
the highest commercial paper rating assigned by Moody's. Among the factors
considered by Moody's in assigning ratings are the following: (1) evaluation of
the management of the issuer; (2) economic evaluation of the issuer's industry
or industries and the appraisal of speculative-type risks which may be inherent
in certain areas; (3) evaluation of the issuer's products in relation to
competition and customer acceptance; (4) liquidity; (5) amount and quality of
long-term debt; (6) trend of earnings over a period of ten years; (7) financial
strength of a parent company and the relationships which exist with the issuer;
and (8) recognition by the management of obligations which may be present or may
arise as a result of public interest questions and preparations to meet such
obligations.
 
BOND RATINGS
 
     Bonds rated AA by Standard & Poor's are judged by S&P to be high-grade
obligations, and in the majority of instances differs only in small degrees from
issues rated AAA (the AA rating may be modified by the addition of a plus or
minus sign to show relative standing with the AA category). Bonds rated AAA are
considered by S&P to be the highest grade obligations and possess the ultimate
degree of protection as to principal and interest. Bonds rated Aa by Moody's are
judged by Moody's to be of high quality by all standards. Together with the Aaa
group, they comprise what are generally known as high-grade bonds. They are
rated lower than Aaa bonds because margins of protection may not be as large or
fluctuations of protective
 
                                       10
<PAGE>   57
 
elements may be of greater amplitude or there may be other elements present
which make the long-term risks appear somewhat larger. Moody's also supplies
numerical indicators, 1, 2 and 3 to the Aa rating category. The modifier 1
indicates that the security is in the higher end of its rating category; the
modifier 2 indicates a mid-range ranking and 3 indicates a ranking toward the
lower end of the category.
 
VARIABLE AMOUNT MASTER DEMAND NOTES
 
     Variable amount master demand notes are demand obligations that permit the
investment of fluctuating amounts at varying market rates of interest pursuant
to an arrangement between the issuer and a commercial bank acting as agent for
the payees of such notes, whereby both parties have the right to vary the amount
of the outstanding indebtedness on the notes. Because variable amount master
demand notes are direct lending arrangements between a lender and a borrower, it
is not generally contemplated that such instruments will be traded, and there is
no secondary market for these notes, although they are redeemable (and thus
immediately repayable by the borrower) at face value, plus accrued interest, at
any time. In connection with a Portfolio's investment in variable amount master
demand notes, Vanguard's investment management staff will monitor, on an ongoing
basis, the earning power, cash flow and other liquidity ratios of the issuer,
and the borrower's ability to pay principal and interest on demand.
 
DESCRIPTION OF U.S. GOVERNMENT SECURITIES
 
     As used in this prospectus, the term "U.S. Government Securities" refers to
a variety of securities which are issued or guaranteed by the United States
Treasury, by various agencies of the United States Government, and by various
instrumentalities which have been established or sponsored by the United States
Government. The term also refers to "repurchase agreements" collateralized by
such securities.
 
     U.S. Treasury Securities are backed by the "full faith and credit" of the
United States. Securities issued or guaranteed by Federal agencies and the U.S.
Government sponsored instrumentalities may or may not be backed by the full
faith and credit of the United States. In the case of securities not backed by
the full faith and credit of the United States, the investor must look
principally to the agency or instrumentality issuing or guaranteeing the
obligation for ultimate repayment, and may not be able to assert a claim against
the United States itself in the event the agency or instrumentality does not
meet its commitment.
 
     Some of the U.S. Government agencies that issue or guarantee securities
include the Export-Import Bank of the United States, Farmers Home
Administration, Federal Housing Administration, Maritime Administration, Small
Business Administration, and The Tennessee Valley Authority.
 
     An instrumentality of the U.S. Government is a government agency organized
under Federal charter with government supervision. Instrumentalities issuing or
guaranteeing securities include, among others, Federal Home Loan Banks, the
Federal Land Banks, Central Bank for Cooperatives, Federal Intermediate Credit
Banks, and the Federal National Mortgage Association.
 
DESCRIPTION OF REPURCHASE AGREEMENTS
 
     Repurchase agreements are transactions by which a person purchases a
security and simultaneously commits to resell that security to the seller (a
member bank of the Federal Reserve System or recognized securities dealer) at an
agreed upon price on an agreed upon date within a number of days (usually not
more than seven) from the date of purchase. The resale price reflects the
purchase price plus an agreed upon market rate of interest which is unrelated to
the coupon rate or maturity of the purchased security. A repurchase agreement
involves the obligation of the seller to pay the agreed upon price, which
obligation is in effect secured by the value of the underlying security.
 
     The use of repurchase agreements involves certain risks. For example, if
the seller of the agreement defaults on its obligation to repurchase the
underlying securities at a time when the value of these securities has declined,
the Portfolio may incur a loss upon disposition of them. If the seller of the
agreement becomes insolvent and subject to liquidation or reorganization under
the Bankruptcy Code or other laws, a bankruptcy court may determine that the
underlying securities are collateral not within the control of the Portfolio and
therefore subject to sale by the trustee in bankruptcy. Finally, it is possible
that the Portfolio may not be able to substantiate its
 
                                       11
<PAGE>   58
 
interest in the underlying securities. While the Fund's management acknowledges
these risks, it is expected that they can be controlled through stringent
security selection criteria and careful monitoring procedures.
 
EURODOLLAR AND YANKEE OBLIGATIONS
 
     Eurodollar bank obligations are dollar-denominated certificates of deposit
and time deposits issued outside the U.S. capital markets by foreign branches of
banks and by foreign banks. Yankee bank obligations are dollar-denominated
obligations issued in the U.S. capital markets by foreign banks.
 
     Eurodollar and Yankee obligations are subject to the same risks that
pertain to domestic issues, notably credit risk, market risk and liquidity risk.
Additionally, Eurodollar (and to a limited extent, Yankee) obligations are
subject to certain sovereign risks. One such risk is the possibility that a
sovereign country might prevent capital, in the form of dollars, from flowing
across their borders. Other risks include: adverse political and economic
developments; the extent and quality of government regulation of financial
markets and institutions; the imposition of foreign withholding taxes; and
expropriation or nationalization of foreign issuers. However, Eurodollar and
Yankee obligations will undergo the same credit analysis as domestic issues in
which the Prime Portfolio invests, and will have at least the same financial
strength as the domestic issuers approved for the Prime Portfolio.
 
                                       12
<PAGE>   59
 
                                     PART C
                      VANGUARD MONEY MARKET RESERVES, INC.
                               OTHER INFORMATION
 
ITEM 24. FINANCIAL STATEMENTS AND EXHIBITS
     (A) FINANCIAL STATEMENTS
 
   
     The Registrant's audited financial statements for the year ended November
30, 1994, including Price Waterhouse LLP's report thereon, are incorporated by
reference, in the Statement of Additional Information, from the Registrant's
1994 Annual Report to Shareholders which has been filed with the Commission. The
financial statements included in the Annual Report are:
    
 
   
      1. Statement of Net Assets as of November 30, 1994
    
   
      2. Statement of Operations for the year ended November 30, 1994
    
   
      3. Statement of Changes in Net Assets for each of the two years in the
         period ended November 30, 1994
    
   
      4. Financial Highlights for each of the five years in the period ended
         November 30, 1994
    
      5. Notes to Financial Statements
      6. Report of Independent Accountants
 
     (B) EXHIBITS
 
      1. Articles of Incorporation
      2. By-Laws of Registrant
      3. Not Applicable
      4. Not Applicable
      5. Not Applicable
      6. Not Applicable
      7. Reference is made to the section entitled "Management of the Fund" in
         the Registrant's Statement of Additional Information
      8. Form of Custody Agreement
      9. Form of Vanguard Service Agreement
     10. Opinion of Counsel
     11. Consent of Independent Accountants*
     12. Financial Statements -- reference is made to (a) above
     13. Not Applicable
     14. Not Applicable
     15. Not Applicable
     16. Schedule for Computation of Performance Quotations*
   
     27. Financial Data Schedule*
    
- ---------------
*Filed herewith
 
ITEM 25. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT
 
   
     Registrant is not controlled by or under common control with any person.
The officers of the Registrant, the investment companies in The Vanguard Group
of Investment Companies and The Vanguard Group, Inc. are identical. Reference is
made to the caption "Management of the Fund" in the Prospectus constituting Part
A and in the Statement of Additional Information constituting Part B of this
Registration Statement.
    
 
ITEM 26. NUMBER OF HOLDERS OF SECURITIES
 
   
     As of November 30, 1994 the number of shareholders of each portfolio of the
Fund was as follows:
    
 
   
<TABLE>
    <S>                                                                               <C>
    Prime Portfolio................................................................   724,370
    Federal Portfolio..............................................................   110,564
    U.S. Treasury Portfolio........................................................    89,658
</TABLE>
    
<PAGE>   60
 
ITEM 27. INDEMNIFICATION
 
     Reference is made to Article XI of Registrant's Articles of Incorporation.
 
ITEM 28. BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER
 
     Investment advisory services are provided to the Registrant on an at-cost
basis by The Vanguard Group, Inc., a jointly-owned subsidiary of the Registrant
and the other Funds in the Group. See the information concerning The Vanguard
Group set forth in Parts A and B.
 
ITEM 29. PRINCIPAL UNDERWRITERS
 
     (a) None
 
     (b) Not Applicable
 
ITEM 30. LOCATION OF ACCOUNTS AND RECORDS
 
The books, accounts and other documents required by Section 31(a) under the     
Investment Company Act and the rules promulgated thereunder will be maintained
in the physical possession of Registrant; Registrant's Transfer Agent, The
Vanguard Group, Inc. c/o The Vanguard Financial Center, Valley Forge,
Pennsylvania 19482; and the Registrant's Custodian, CoreStates Bank, N.A.,
Philadelphia, Pa.
 
ITEM 31. MANAGEMENT SERVICES
 
     Other than the Amended and Restated Funds' Service Agreement with The
Vanguard Group, Inc. which was previously filed as Exhibit 9(c) and described in
Part B hereof under "Management of the Fund;" the Registrant is not a party of
any management-related service contract.
 
ITEM 32. UNDERTAKINGS
 
     Annual meetings of shareholders will not be held except as required by the
Investment Company Act of 1940 ("1940 Act") or other applicable law. Registrant
undertakes to comply with the provisions of Section 16(c) of the 1940 Act in
regard to shareholders' rights to call a meeting of shareholders for the purpose
of voting on the removal of Directors and to assist in shareholder
communications in such matters, to the extent required by law.
 
     Registrant hereby undertakes to provide an Annual Report to Shareholders or
prospective investors, free of charge, upon request.
<PAGE>   61
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant certifies that it meets all the
requirements for effectiveness of this Registration Statement pursuant to Rule
485(b) under the Securities Act of 1933 and has duly caused this Post-Effective
Amendment to this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the Town of Valley Forge and the
Commonwealth of Pennsylvania, on the 10th day of March, 1995.
    
 
VANGUARD MONEY MARKET RESERVES, INC.
 
BY: (Raymond J. Klapinsky)
    John C. Bogle*, Chairman and Chief Executive Officer
 
     Pursuant to the requirements of the Securities Act of 1933, this
Post-Effective Amendment to the Registration Statement has been signed below by
the following persons in the capacities and on the date indicated:
 
BY: (Raymond J. Klapinsky)
    John C. Bogle*, Chairman of the Board, Director,
    and Chief Executive Officer
   
    March 10, 1995
    
 
BY: (Raymond J. Klapinsky)
    John J. Brennan*, Director and President
   
    March 10, 1995
    
 
BY: (Raymond J. Klapinsky)
    Robert E. Cawthorn*, Director
   
    March 10, 1995
    
 
BY: (Raymond J. Klapinsky)
    Barbara B. Hauptfuhrer*, Director
   
    March 10, 1995
    
 
BY: (Raymond J. Klapinsky)
    Bruce K. MacLaury, Director
   
    March 10, 1995
    
 
BY: (Raymond J. Klapinsky)
    Burton G. Malkiel*, Director
   
    March 10, 1995
    
 
BY: (Raymond J. Klapinsky)
    John C. Sawhill*, Director
   
    March 10, 1995
    
 
BY: (Raymond J. Klapinsky)
    James O. Welch, Jr.*, Director
   
    March 10, 1995
    
 
BY: (Raymond J. Klapinsky)
    J. Lawrence Wilson*, Director
   
    March 10, 1995
    
 
BY: (Raymond J. Klapinsky)
    Richard F. Hyland*, Treasurer and Principal
    Financial Officer and Accounting Officer
   
    March 10, 1995
    
 
*By Power of Attorney. See File Number 2-14336, January 23, 1990. Incorporated
by Reference.
<PAGE>   62
 
                               INDEX TO EXHIBITS
 
   
<TABLE>
<S>                                                                                    <C>
Consent of Independent Accountants...................................................  EX-99.B11
Schedule for Computation of Performance Quotations...................................  EX-99.B16
Financial Data Schedule..............................................................  EX-27
</TABLE>
    

<PAGE>   1
 
   
                                                                       EX-99.B11
    
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
   
     We hereby consent to the incorporation by reference in the Prospectuses and
the Statement of Additional Information, constituting parts of this amended
Registration Statement on Form N-1A, of our report dated December 30, 1994,
relating to the financial statements, and the financial highlights, appearing in
the November 30, 1994 Annual Report to Shareholders of Vanguard Money Market
Reserves, Inc. We also consent to the references to us under the headings
"Financial Highlights" and "General Information" in the Prospectuses and
"Financial Statements" in the Statement of Additional Information.
    
 
   
PRICE WATERHOUSE LLP
    
Philadelphia, PA
   
March 9, 1995
    

<PAGE>   1
 
   
                                                                       EX-99.B16
    
 
               SCHEDULE FOR COMPUTATION OF PERFORMANCE QUOTATIONS
                         VANGUARD MONEY MARKET RESERVES
 
   
1. Average Annual Total Return (As of November 30, 1994)
    
 
        P (1 + T)n = ERV
 
<TABLE>
<S>          <C>   
     Where:  P = a hypothetical initial payment of $1,000
             T = average annual total return
             N = number of years
             ERV = ending redeemable value at the end of the period
</TABLE>
 
   
<TABLE>
    <S>          <C>
    EXAMPLE:
         Prime
      One Year
           P =   $1,000
           T =   3.87%
           N =   1
         ERV =   $1,038.70
     Five Year
           P =   $1,000
           T =   5.09%
           N =   5
         ERV =   $1,281.48
      Ten Year
           P =   $1,000
           T =   6.37%
           N =   10
         ERV =   $1,854.30
       Federal
      One Year
           P =   $1,000
           T =   3.82%
           N =   1
         ERV =   $1,038.21
     Five Year
           P =   $1,000
           T =   4.98%
           N =   5
         ERV =   $1,274.88
      Ten Year
           P =   $1,000
           T =   6.20%
           N =   10
         ERV =   $1,824.84
</TABLE>
    
<PAGE>   2
 
   
<TABLE>
    <S>          <C>
    U.S. Treasury
      One Year
           P =   $1,000
           T =   3.63%
           N =   1
         ERV =   $1,036.27
     Five Year
           P =   $1,000
           T =   4.81%
           N =   5
         ERV =   $1,264.94
      Ten Year
           P =   $1,000
           T =   5.95%
           N =   10
         ERV =   $1,782.63
</TABLE>
    
 
   
2. YIELD (30 Days Ended November 30, 1994)
    
                                a   
                  Yield = 2[( ----- +1)6-1] -b x 100
                              c x d
                                   
                             
   
<TABLE>
    <S>         <C>
        Where:      a = dividends and interest paid during the period
                    b = expense ratios during the period (net of reimbursements)
                    c = the average daily number of shares outstanding during the period
                    d = the maximum offering price per share on the last day of the period
    Example         a = $
                    b = $--
                    c =
                    d = $
                Yield =   %
</TABLE>
    

<TABLE> <S> <C>

<ARTICLE> 6
<RESTATED> 
<CIK> 0000106830
<NAME> VANGUARD MONEY MARKET RESERVES, INC.
<SERIES>
   <NUMBER> 1
   <NAME> PRIME PORTFOLIO
<MULTIPLIER> 1,000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          NOV-30-1994
<PERIOD-START>                             DEC-01-1993
<PERIOD-END>                               NOV-30-1994
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                         15069109
<INVESTMENTS-AT-VALUE>                        15069109
<RECEIVABLES>                                   136631
<ASSETS-OTHER>                                    2619
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                15208359
<PAYABLE-FOR-SECURITIES>                         19796
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        79846
<TOTAL-LIABILITIES>                              99642
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      15108529
<SHARES-COMMON-STOCK>                         15108531
<SHARES-COMMON-PRIOR>                         12366953
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                            188
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                                  15108717
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                               552670
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   42506
<NET-INVESTMENT-INCOME>                         510164
<REALIZED-GAINS-CURRENT>                          (97)
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                           510067
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       510164
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                       17731785
<NUMBER-OF-SHARES-REDEEMED>                   15479781
<SHARES-REINVESTED>                             489573
<NET-CHANGE-IN-ASSETS>                         2741480
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          285
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             1460
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  42506
<AVERAGE-NET-ASSETS>                          13277829
<PER-SHARE-NAV-BEGIN>                            1.000
<PER-SHARE-NII>                                  0.038
<PER-SHARE-GAIN-APPREC>                          0.000
<PER-SHARE-DIVIDEND>                             0.038
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              1.000
<EXPENSE-RATIO>                                  0.003
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<RESTATED> 
<CIK> 0000106830
<NAME> VANGUARD MONEY MARKET RESERVES, INC.
<SERIES>
   <NUMBER> 2
   <NAME> FEDERAL PORTFOLIO
<MULTIPLIER> 1,000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          NOV-30-1994
<PERIOD-START>                             DEC-01-1993
<PERIOD-END>                               NOV-30-1994
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          2233295
<INVESTMENTS-AT-VALUE>                         2233295
<RECEIVABLES>                                    11784
<ASSETS-OTHER>                                     342
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 2245421
<PAYABLE-FOR-SECURITIES>                         36288
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        12709
<TOTAL-LIABILITIES>                              48997
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       2196347
<SHARES-COMMON-STOCK>                          2196318
<SHARES-COMMON-PRIOR>                          1906901
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                             77
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                                   2196424
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                83281
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                    6504
<NET-INVESTMENT-INCOME>                          76777
<REALIZED-GAINS-CURRENT>                          (55)
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                            76722
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        76777
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        1946245
<NUMBER-OF-SHARES-REDEEMED>                    1730176
<SHARES-REINVESTED>                              73348
<NET-CHANGE-IN-ASSETS>                          289362
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          209
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              224
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   6504
<AVERAGE-NET-ASSETS>                           2030763
<PER-SHARE-NAV-BEGIN>                            1.000
<PER-SHARE-NII>                                  0.038
<PER-SHARE-GAIN-APPREC>                          0.000
<PER-SHARE-DIVIDEND>                             0.038
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              1.000
<EXPENSE-RATIO>                                  0.003
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<RESTATED> 
<CIK> 0000106830
<NAME> VANGUARD MONEY MARKET RESERVES, INC.
<SERIES>
   <NUMBER> 3
   <NAME> U.S. TREASURY PORTFOLIO
<MULTIPLIER> 1,000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          NOV-30-1994
<PERIOD-START>                             DEC-01-1993
<PERIOD-END>                               NOV-30-1994
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          2098327
<INVESTMENTS-AT-VALUE>                         2098327
<RECEIVABLES>                                    17074
<ASSETS-OTHER>                                     770
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 2116171
<PAYABLE-FOR-SECURITIES>                         49300
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        10814
<TOTAL-LIABILITIES>                              60114
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       2055884
<SHARES-COMMON-STOCK>                          2055866
<SHARES-COMMON-PRIOR>                          1751011
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                            173
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                                   2056057
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                75370
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                    6163
<NET-INVESTMENT-INCOME>                          69207
<REALIZED-GAINS-CURRENT>                          (24)
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                            69183
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        69207
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        2178457
<NUMBER-OF-SHARES-REDEEMED>                    1939613
<SHARES-REINVESTED>                              66010
<NET-CHANGE-IN-ASSETS>                          304830
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          197
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              212
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   6163
<AVERAGE-NET-ASSETS>                           1926692
<PER-SHARE-NAV-BEGIN>                            1.000
<PER-SHARE-NII>                                  0.036
<PER-SHARE-GAIN-APPREC>                          0.000
<PER-SHARE-DIVIDEND>                             0.036
<PER-SHARE-DISTRIBUTIONS>                        0.000
<RETURNS-OF-CAPITAL>                             0.000
<PER-SHARE-NAV-END>                              1.000
<EXPENSE-RATIO>                                  0.003
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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