VANGUARD TREASURY FUND
485BPOS, 1997-03-18
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<PAGE>   1
 
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                   FORM N-1A
                  REGISTRATION STATEMENT (NO. 333-11763) UNDER
                           THE SECURITIES ACT OF 1933
                          PRE-EFFECTIVE AMENDMENT NO.
   
                         POST-EFFECTIVE AMENDMENT NO. 2
    
                                      AND
 
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                  ACT OF 1940
   
                                AMENDMENT NO. 3
    
                             VANGUARD TREASURY FUND
               (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 FILING BECOME EFFECTIVE
   
 on March 26, 1997, 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.
 
   
     WE HAVE ELECTED TO REGISTER AN INDEFINITE NUMBER OF SHARES UNDER THIS
REGISTRATION STATEMENT PURSUANT TO RULE 24F-2 UNDER THE INVESTMENT COMPANY ACT
OF 1940. WE FILED OUR RULE 24F-2 NOTICE FOR THE PERIOD ENDED NOVEMBER 30, 1996
ON JANUARY 31, 1997.
    
 
================================================================================
<PAGE>   2
 
                             VANGUARD TREASURY FUND
 
                             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 Strategies; Investment
                                                               Limitations; Investment Policies;
                                                               General Information
    Item 5.   Management of the Fund........................   Management of the Fund; The Funds and
                                                               Vanguard
    Item 6.   Capital Stock and Other Securities............   Investing with Vanguard; Buying
                                                               Shares; Redeeming Shares; Share
                                                               Price; Dividends and Taxes; General
                                                               Information
    Item 7.   Purchase of Securities Being Offered..........   Cover Page; Investing with Vanguard;
                                                               Buying Shares
    Item 8.   Redemption or Repurchase......................   Redeeming 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
   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
                               [COVER OF A SHIP]


                                     VANGUARD MONEY
                                     MARKET PORTFOLIOS

   
                                     Prospectus
                                     March 26, 1997
    

- ----------
VANGUARD MONEY 
MARKET RESERVES

- -        PRIME PORTFOLIO

- -        FEDERAL PORTFOLIO


VANGUARD TREASURY
MONEY MARKET
PORTFOLIO

   
This prospectus contains financial data for the Portfolios through the fiscal
year ended November 30, 1996.
    


                                              [THE VANGUARD GROUP LOGO]
<PAGE>   4
VANGUARD MONEY MARKET RESERVES,
VANGUARD TREASURY MONEY MARKET PORTFOLIO               Money Market Mutual Funds


   
CONTENTS

Portfolio Expenses          3
Financial Highlights        5
A Word About Risk           7
The Portfolios'
Objectives                  7
Who Should Invest           7
Investment Policies         8
Investment Limitations     11
Investment
Performance                11
Share Price                13
Dividends and Taxes        13
The Funds and
Vanguard                   13
Investment Adviser         14
General Information        14
Investing
with Vanguard              15
Services and
Account Features           15
Types of Accounts          16
Distribution Options       17
Buying Shares              17
Redeeming Shares           19
Fund and Account Updates   22
Prospectus Postscript      23
Risk Quiz                  24
Glossary    Inside Back Cover
    

INVESTMENT OBJECTIVES AND POLICIES
Vanguard Money Market Reserves, Inc. is a diversified, open-end investment
company that consists of two separate Portfolios: Federal and Prime. The
Treasury Money Market Portfolio is part of Vanguard Treasury Fund, which is a
diversified, open-end investment company as well.

         Each Portfolio seeks to provide current income and to maintain
liquidity and a stable share price of $1.00. Each Portfolio focuses on specific
high-quality, short-term money market instruments, such as securities backed by
the full faith and credit of the U.S. government, securities issued by U.S.
government agencies, or obligations issued by corporations and financial
institutions.

         IT IS IMPORTANT TO NOTE THAT EACH PORTFOLIO SEEKS TO MAINTAIN, BUT DOES
NOT GUARANTEE, A STABLE NET ASSET VALUE OF $1.00 PER SHARE. IN ADDITION, NONE OF
THE PORTFOLIOS' SHARES IS GUARANTEED OR INSURED BY THE FDIC, THE U.S.
GOVERNMENT, OR ITS AGENCIES.

FEES AND EXPENSES
The Portfolios are offered on a no-load basis, which means that you pay no sales
commissions or 12b-1 marketing fees. You will, however, incur expenses for
investment advisory, management, administrative, and distribution services,
which are included in each Portfolio's expense ratio.

   
ADDITIONAL INFORMATION ABOUT THE PORTFOLIOS
Statements of Additional Information (dated March 26, 1997) containing more
information about the Portfolios are, by reference, part of this prospectus and
may be obtained without charge by writing to Vanguard or by calling our Investor
Information Department at 1-800-662-7447.

         The Prime Portfolio features two, separate classes of shares. For
investments of $10 million or more, the Portfolio offers Prime Portfolio
Institutional Shares (available through a separate prospectus). Prime Portfolio
Shares and Prime Portfolio Institutional Shares do not have the same expenses;
as a result, the performance of these separate classes could differ.
    

WHY READING THIS PROSPECTUS IS IMPORTANT
This prospectus explains the objectives, risks, and policies of the three
Portfolios. To highlight terms and concepts important to mutual fund investors,
we have provided "Plain Talk" explanations along the way. Reading the prospectus
will help you to decide whether one of the Portfolios is the right investment
for you.


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>   5
PORTFOLIO PROFILE                                 Vanguard Money Market Reserves
                                        Vanguard Treasury Money Market Portfolio
                                                                                


WHO SHOULD INVEST (page 7)

- -        Investors seeking a money market mutual fund as part of a balanced and
         diversified investment program.

- -        Investors uncomfortable with share-price fluctuations.

- -        Investors seeking current income.

- -        Investors needing a temporary holding place for a portion of their
         assets.

WHO SHOULD NOT INVEST

- -        Investors seeking growth of their investment over time.

- -        Investors looking for a fund that invests in stocks or bonds.

RISKS OF THE PORTFOLIOS (pages 7 - 10)

Each Portfolio is subject to income risk (the chance that falling short-term
interest rates will cause the Portfolios' income -- and thus the Portfolios'
return -- to decline) and manager risk (the chance that poor security selection
will cause a Portfolio to lag similar funds). In addition, while the credit
quality of all three Portfolios is expected to be very high, each Portfolio is
subject to some degree of credit risk (the chance that the issuer of a security
will be unable to pay interest and principal in a timely manner). More detailed
information about risk -- including risks specific to each Portfolio -- is
provided beginning on page 8.

DIVIDENDS (page 13)

Dividends are declared daily and paid on the first business day of each month.

   
INVESTMENT ADVISER (page 14)
Vanguard Fixed Income Group, Valley Forge, PA, manages each of the three
Portfolios.
    

   
Minimum Initial Investment for Each Portfolio: $3,000; $1,000 for IRAs and
custodial accounts for minors
    

   
ACCOUNT FEATURES (pages 15 - 19)
    

- -       Telephone Redemption

- -       Checkwriting

- -       Vanguard Direct Deposit Service(sm)

- -       Vanguard Automatic Exchange Service(sm)

- -       Vanguard Fund Express(R)

- -       Vanguard Dividend Express(sm)

AVERAGE ANNUAL TOTAL RETURNS --
PERIODS ENDED NOVEMBER 30, 1996

   
<TABLE>
<CAPTION>
                                              1 YEAR        5 YEARS      10 YEARS
                                              -----------------------------------
<S>                                            <C>           <C>           <C> 
Treasury Money
  Market Portfolio*                             5.1%          4.1%          5.6%
Lipper U.S. Treasury Money
  Market Average                                4.8           3.9           5.4
Federal Portfolio                               5.2%          4.3%          5.8%
Lipper U.S. Government
  Money Market Average                          4.8           3.9           5.4
Prime Portfolio                                 5.3           4.4           6.0
Lipper Non-Government
  Money Market Average                          4.8%          3.9%          5.5%
- --------------------------------------------------------------------------------
</TABLE>

*Formerly known as Vanguard Money Market Reserves -  U.S. Treasury Portfolio.
    

                                                                                

In evaluating past performance, remember that it is not indicative of future
performance. Performance figures include the reinvestment of any dividends. The
returns shown are net of expenses, but they do not reflect income taxes an
investor would have incurred. An investment in a money market fund is neither
insured nor guaranteed by the U.S. government, and there is no assurance that
the fund will be able to maintain a stable net asset value of $1.00 per share.


                                       1
<PAGE>   6
PORTFOLIO PROFILE (continued)                     Vanguard Money Market Reserves
                                        Vanguard Treasury Money Market Portfolio



                                                 
   
<TABLE>
<CAPTION>

                                                 TREASURY
                                               MONEY MARKET*        FEDERAL            PRIME
- -------------------------------------------------------------------------------------------------

<S>                                            <C>               <C>              <C>           
Inception Date:                                   12/2/96           7/13/81           6/4/75
Net Assets as of 11/30/96:                     $2.92 billion     $3.10 billion    $22.22 billion

Expense Ratio for the Year

   Ended 11/30/96:                                 0.32%             0.32%             0.32%

Fees
   Loads, 12b-1 Marketing Fees:                    None              None              None
Suitable for IRAs:                                 Yes               Yes               Yes

Newspaper Abbreviation:**                        VangTrsy           VangFdl           VangPr

Vanguard Fund Number:                               050               033               030
- -------------------------------------------------------------------------------------------------
</TABLE>
    


*On 12/2/96, Vanguard Money Market Reserves - U.S. Treasury Portfolio was
reorganized as a separate portfolio of Vanguard Treasury Fund and renamed the
Treasury Money Market Portfolio.

**Money market portfolios are listed separately from the daily mutual fund
listings.


                                       2
<PAGE>   7
PORTFOLIO EXPENSES

The examples below are designed to help you understand the various costs you
would bear, directly or indirectly, as an investor in one of the Portfolios.

         As noted in this table, you do not pay fees of any kind when you buy,
sell, or exchange shares of any Portfolio:

SHAREHOLDER TRANSACTION EXPENSES
Sales Load Imposed on Purchases:                            None
Sales Load Imposed on Reinvested Dividends:                 None
Redemption Fees:                                            None
Exchange Fees:                                              None

   
         The next table illustrates the operating expenses that you would incur
as a shareholder of each Portfolio. These expenses are deducted from the
Portfolio's income before it is paid to you. Expenses include investment
advisory fees as well as the costs of maintaining accounts, administering the
Portfolios, providing shareholder services, and other activities. The expenses
shown in the table are based upon expenses incurred in the fiscal year ended
November 30, 1996 (the expenses for the Treasury Money Market Portfolio are
based upon those of Vanguard Money Market Reserves - U.S. Treasury Portfolio for
its fiscal year ended November 30, 1996).
    
   
ANNUAL PORTFOLIO OPERATING EXPENSES (as a percentage of average net assets)
    

<TABLE>
<CAPTION>
                                  TREASURY MONEY       FEDERAL      PRIME
                                  MARKET PORTFOLIO    PORTFOLIO    PORTFOLIO
- --------------------------------------------------------------------------------
<S>                              <C>    <C>     <C>    <C>    <C>     <C>
Management and
   Administrative Expenses:             0.26%          0.26%          0.26%
Investment Advisory Expenses:           0.01%          0.01%          0.01%
12b-1 Marketing Fees:                   None           None           None
Other Expenses
   Marketing and Distribution
     Costs:                      0.03%          0.03%         0.03%
   Miscellaneous Expenses
     (e.g., Taxes, Auditing):    0.02%                 0.02%          0.02%
                                 ----                  ----           ----
Total Other Expenses:                   0.05%          0.05%          0.05%
TOTAL OPERATING EXPENSES                ----           ----           ----
   (EXPENSE RATIO):                     0.32%          0.32%          0.32%
                                        ====           ====           ====
</TABLE>
                                PLAIN TALK ABOUT
                             THE COSTS OF INVESTING

Costs are an important consideration in choosing a mutual fund. That's because
you, as a shareholder, pay the costs of operating a fund, plus any transaction
costs associated with buying, selling, or exchanging shares. These costs can
erode a substantial portion of the gross income a fund achieves. Even seemingly
small differences in fund expenses can, over time, have a dramatic impact on a
fund's performance. 

                                   PLAIN TALK
                                     ABOUT

                                 FUND EXPENSES

   
All mutual funds have operating expenses. These expenses, which are deducted
from a fund's gross income, are expressed as a percentage of the average net
assets of the fund. For instance, the Prime Portfolio's expense ratio in fiscal
year 1996 was 0.32%, or $3.20 per $1,000 of average net assets. The average
money market fund had expenses in 1996 of 0.72%, or $7.20 per $1,000 of average
net assets, according to Lipper Analytical Services, Inc., which reports on the
mutual fund industry.
    


                                       3
<PAGE>   8
The following example illustrates the hypothetical expenses that you would incur
on a $1,000 investment over various periods. The example assumes (1) that the
Portfolio provides a return of 5% a year and (2) that you redeem your investment
at the end of each period. 
<TABLE>
<CAPTION>
PORTFOLIO                     1 YEAR  3 YEARS   5 YEARS  10 YEARS
- -----------------------------------------------------------------
<S>                              <C>     <C>       <C>      <C>
Treasury Money Market            $3      $10       $18      $41
Federal                          $3      $10       $18      $41
Prime                            $3      $10       $18      $41
- -----------------------------------------------------------------
</TABLE>
THIS EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF ACTUAL EXPENSES OR
PERFORMANCE FROM THE PAST OR FOR THE FUTURE, WHICH MAY BE HIGHER OR LOWER THAN
THOSE SHOWN.


                                       4
<PAGE>   9
FINANCIAL HIGHLIGHTS

   
The following financial highlights tables show the results for a share
outstanding for each of the last ten years ended November 30, 1996. The
financial highlights for the fiscal years ended November 30 were audited by
Price Waterhouse LLP, independent accountants. You should read this information
in conjunction with each Portfolio's financial statements and accompanying
notes, which appear in Vanguard Money Market Reserves' most recent Annual Report
(along with the audit report from Price Waterhouse). The Annual Report (which
includes information on the U.S. Treasury Portfolio) is incorporated by
reference in the Statement of Additional Information and in this prospectus, and
contains a more complete discussion of each Portfolio's performance. You may
have the Report sent to you without charge by writing to Vanguard or by calling
our Investor Information Department. 
    

                                PLAIN TALK ABOUT
                   HOW TO READ THE FINANCIAL HIGHLIGHTS TABLE
   
This explanation uses the Treasury Money Market Portfolio as an example. The
Treasury Money Market Portfolio (known as the U.S. Treasury Portfolio until
December 2, 1996) began fiscal 1996 with a net asset value (price) of $1.00 per
share. During the year, the Portfolio earned $.050 per share from investment
income (interest and dividends). All of these earnings were returned to
shareholders in the form of dividend distributions. The earnings ($.050 per
share) less distributions ($.050 per share) resulted in a share price of $1.00
at the end of the year. Assuming that the shareholder had reinvested the
distribution in the purchase of more shares, total return from the Portfolio was
5.11% for the year.
    
   
         As of November 30, 1996, the Portfolio had more than $2.91 billion in
net assets; an expense ratio of 0.32% ($3.20 per $1,000 of net assets); and net
investment income amounting to 4.99% of its average net assets.
    

   
<TABLE>
<CAPTION>
                                     TREASURY MONEY MARKET PORTFOLIO*
                          --------------------------------------------------------------------------------------------------------
                                           Year Ended November 30,
                          --------------------------------------------------------------------------------------------------------
                            1996       1995       1994       1993       1992       1991       1990     1989       1988       1987
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                       <C>        <C>        <C>        <C>        <C>        <C>        <C>      <C>        <C>        <C>   
NET ASSET VALUE,
 BEGINNING OF PERIOD      $ 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      .050       .053       .036       .028       .036       .058       .077     .085       .068       .058
 Net Realized and
  Unrealized Gain (Loss)
  on Investments              --         --         --         --         --         --         --       --         --         --
                          --------------------------------------------------------------------------------------------------------
  TOTAL FROM INVESTMENT
   OPERATIONS               .050       .053       .036       .028       .036       .058       .077     .085       .068       .058
- ----------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
 Dividends from Net
  Investment Income        (.050)     (.053)     (.036)     (.028)     (.036)     (.058)     (.077)   (.085)     (.068)     (.058)
 Distributions from
  Realized Capital Gains      --         --         --         --         --         --         --       --         --         --
                          --------------------------------------------------------------------------------------------------------
  TOTAL DISTRIBUTIONS      (.050)     (.053)     (.036)     (.028)     (.036)     (.058)     (.077)   (.085)     (.068)     (.058)
- ----------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE,
 END OF PERIOD            $ 1.00     $ 1.00     $ 1.00     $ 1.00     $ 1.00     $ 1.00     $ 1.00   $ 1.00     $ 1.00     $ 1.00
==================================================================================================================================
TOTAL RETURN                5.11%      5.47%      3.63%      2.86%      3.68%      5.94%      8.02%    8.89%      7.02%      5.99%
==================================================================================================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
 Period (Millions)        $2,917     $2,527     $2,056     $1,751     $2,321     $2,092     $1,594   $  412     $  140     $  113
Ratio of Expenses to
 Average Net Assets         0.32%      0.32%      0.32%      0.32%      0.30%      0.30%      0.30%    0.31%**    0.70%**    0.79%**
Ratio of Net Investment
 Income to Average
 Net Assets                 4.99%      5.33%      3.59%      2.83%      3.60%      5.76%      7.74%    8.44%      6.85%      5.80%
- ----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
    

*  Formerly known as Vanguard Money Market Reserves - U.S. Treasury Portfolio.

   
** Insurance premiums represent 0.40%, 0.42% and 0.44%.
    





                                       5
<PAGE>   10
   
    

   
<TABLE>
<CAPTION>
                                                                  FEDERAL PORTFOLIO
                           --------------------------------------------------------------------------------------------------------
                                                                YEAR ENDED NOVEMBER 30,
                           --------------------------------------------------------------------------------------------------------
                             1996       1995       1994       1993       1992       1991       1990       1989       1988      1987
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>       <C>   
NET ASSET VALUE,
 BEGINNING OF PERIOD       $ 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       .051       .056       .038       .029       .038       .060       .078       .088       .070      .061
 Net Realized and
  Unrealized Gain (Loss)
  on Investments               --         --         --         --         --         --         --         --         --        --
                           --------------------------------------------------------------------------------------------------------
  TOTAL FROM INVESTMENT
   OPERATIONS                .051       .056       .038       .029       .038       .060       .078       .088       .070      .061
- -----------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
 Dividends from Net
  Investment Income         (.051)     (.056)     (.038)     (.029)     (.038)     (.060)     (.078)     (.088)     (.070)    (.061)
 Distributions from
  Realized Capital Gains       --         --         --         --         --         --         --         --         --        -- 
                           --------------------------------------------------------------------------------------------------------
  TOTAL DISTRIBUTIONS       (.051)     (.056      (.038      (.029)     (.038)     (.060)     (.078)     (.088)     (.070)    (.061)
- -----------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE,
 END OF PERIOD             $ 1.00     $ 1.00     $ 1.00     $ 1.00     $ 1.00     $ 1.00     $ 1.00     $ 1.00     $ 1.00    $ 1.00
===================================================================================================================================
TOTAL RETURN                 5.26%      5.77%      3.82%      2.98%      3.83%      6.18%      8.14%      9.15%      7.20%     6.25%
===================================================================================================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
 Period (Millions)         $3,100     $2,637     $2,196     $1,907     $1,986     $2,000     $1,950     $1,531     $1,214    $  839
Ratio of Expenses to
 Average Net Assets          0.32%      0.32%      0.32%      0.32%      0.30%      0.30%      0.30%      0.28%      0.33%     0.37%
Ratio of Net Investment
 Income to Average
 Net Assets                  5.13%      5.61%      3.78%      2.94%      3.76%      6.01%      7.90%      8.78%      7.00%     6.10%
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
    

   
<TABLE>
<CAPTION>
                                                                              PRIME PORTFOLIO
                           --------------------------------------------------------------------------------------------------------
                                                                            Year Ended November 30,
                           --------------------------------------------------------------------------------------------------------
                             1996       1995       1994       1993       1992       1991       1990       1989       1988      1987
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>       <C>   
NET ASSET VALUE,
 BEGINNING OF PERIOD       $ 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       .052       .057       .038       .030       .038       .062       .080       .090       .072      .063
 Net Realized and
  Unrealized Gain (Loss)
  on Investments               --         --         --         --         --         --         --         --         --        --
                           --------------------------------------------------------------------------------------------------------
  TOTAL FROM INVESTMENT
   OPERATIONS                .052       .057       .038       .030       .038       .062       .080       .090       .072      .063
- -----------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
 Dividends from Net
  Investment Income         (.052)     (.057)     (.038)     (.030)     (.038)     (.062)     (.080)     (.090)     (.072)    (.063)
 Distributions from
  Realized Capital Gains       --         --         --         --         --         --         --         --         --        --
                           --------------------------------------------------------------------------------------------------------
  TOTAL DISTRIBUTIONS       (.052)     (.057)     (.038)     (.030)     (.038)     (.062)     (.080)     (.090)     (.072)    (.063)
- -----------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE,
 END OF PERIOD             $ 1.00     $ 1.00     $ 1.00     $ 1.00     $ 1.00     $ 1.00     $ 1.00     $ 1.00     $ 1.00    $ 1.00
===================================================================================================================================
TOTAL RETURN                 5.31%      5.82%      3.87%      3.02%      3.89%      6.39%      8.32%      9.40%      7.47%     6.49%
===================================================================================================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
 Period (Millions)        $22,218    $18,764    $15,109    $12,367    $12,638    $13,496    $13,579    $11,067     $6,863    $4,088
Ratio of Expenses to
 Average Net Assets          0.32%      0.32%      0.32%      0.32%      0.30%      0.30%      0.30%      0.28%      0.33%     0.37%
Ratio of Net Investment
 Income to Average
 Net Assets                  5.18%      5.64%      3.84%      2.98%      3.82%      6.20%      8.06%      9.05%      7.28%     6.30%
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
    

   From time to time, the Vanguard funds advertise yield and total return
figures. Yield is an historical measure of dividend income, and total return is
a measure of past dividend income (assuming that it has been reinvested) plus
any capital appreciation. Neither yield nor total return should be used to
predict the future performance of a fund.

                                       6
<PAGE>   11
   
A WORD ABOUT RISK

This prospectus describes the risks you will face as an investor in the Treasury
Money Market, Federal, and Prime Portfolios. It is important to keep in mind one
of the main axioms of investing: the higher the risk of losing money, the higher
the potential reward. The reverse, also, is generally true: the lower the risk,
the lower the potential reward. As you consider an investment in one or more of
the Portfolios, you should weigh your desire for income with your need to
protect your investment.

         Look for this "warning flag" symbol [FLAG] throughout the prospectus.
It is used to mark detailed information about each type of risk that you, as a
shareholder of any of the three Portfolios, may confront.
    

THE PORTFOLIOS' OBJECTIVES

Each Portfolio seeks to provide current income while maintaining liquidity and a
stable net asset value of $1.00 per share. These objectives are fundamental,
which means that they cannot be changed unless a majority of Portfolio
shareholders vote to do so.


WHO SHOULD INVEST

Any of the Portfolios may be a suitable investment for you if:

- -        You wish to add a money market portfolio to your existing holdings,
         which could include other cash -- as well as stock, bond, and
         tax-exempt -- investments.

- -        You want an investment that does not fluctuate in value.

- -        You want current income.
 
- -        You characterize your investment temperament as "very conservative."

- -        You want to be able to move your money into stock or bond investments
         quickly and without penalty.

         Each Portfolio is intended to serve most investors' short-term needs.
However, investors who engage in excessive in-and-out trading activity generate
additional costs that are borne by all of the Portfolio's shareholders. To
minimize such costs, which reduce the ultimate returns achieved by you and other
shareholders, the Portfolios have adopted the following policies:

- -        Each of the Portfolios reserves the right to reject any purchase
         request -- including exchanges from other Vanguard Funds -- that it
         regards as disruptive to the efficient management of the Portfolio.
         This could be because of the timing of the investment or because of a
         history of excessive trading by the investor.

- -        The Portfolios reserve the right to stop offering shares at any time.

                                       7
<PAGE>   12
                                PLAIN TALK ABOUT
                                  CASH RESERVES

Cash reserves are any investment that can be easily converted into cash with
little or no cost or penalty. A money market mutual fund, a checking account or
certificate of deposit (CD) at a bank, and Treasury bills issued by the U.S.
government are examples of cash reserves. Keep in mind, however, that each type
varies in its credit quality and its ability to provide a competitive yield. 

INVESTMENT POLICIES
   

This section explains how the Portfolios' investment adviser pursues the
objectives of income, liquidity, and stability. It also explains several
important risks -- income risk, manager risk, and credit risk -- faced by
Portfolio shareholders. Unlike the Portfolios' objectives, the Portfolios'
policies are not fundamental and can be changed by the Portfolios' boards of
directors or trustees without shareholder approval. However, before making any
important change in its policies, the Portfolios will give shareholders 30-days
notice, in writing.
    

MARKET EXPOSURE

Each Portfolio invests in very high-quality money market instruments -- also
known as cash reserves -- that are considered short term (that is, they mature
in 13 months or less). Each Portfolio will maintain a dollar-weighted average
maturity of 90 days or less.

[FLAG]   EACH PORTFOLIO IS SUBJECT TO INCOME RISK, WHICH IS THE POSSIBILITY THAT
         A PORTFOLIO'S DIVIDENDS (THAT IS, INCOME) WILL DECLINE BECAUSE OF
         FALLING INTEREST RATES. BECAUSE THE PORTFOLIOS' INCOME IS BASED ON
         SHORT-TERM INTEREST RATES -- WHICH CAN FLUCTUATE SIGNIFICANTLY OVER
         SHORT PERIODS -- INCOME RISK IS EXPECTED TO BE HIGH FOR ALL THREE
         PORTFOLIOS.
   

         To illustrate how the yields of short-term securities can fluctuate as
interest rates rise and fall, the following chart shows month-end yields for
short-term securities (as represented by 90-day Treasury bills) and long-term
securities (as represented by 30-year U.S. Treasury bonds) over the past five
years.
    


   
                    SHORT-TERM AND LONG-TERM MONTH-END YIELDS
                                  (1992 - 1996)

                                  [GRAPH]
    



These yields reflect past performance and should not be regarded as an
indication of future returns from either Treasury bills or bonds as a whole or
any of the Fund's Portfolios in particular.

                                       8
<PAGE>   13
SECURITY SELECTION

Vanguard Fixed Income Group, adviser to the Portfolios, selects high-quality
money market instruments. Each Portfolio focuses on securities of a particular
class of issuer (for example, the U.S. government, U.S. government agencies,
financial institutions).

[FLAG]   EACH PORTFOLIO IS SUBJECT TO MANAGER RISK, WHICH IS THE POSSIBILITY
         THAT VANGUARD FIXED INCOME GROUP MAY DO A POOR JOB OF SELECTING
         SECURITIES.

         The Treasury Money Market Portfolio invests solely in securities whose
interest and principal payments are backed by the full faith and credit of the
U.S. government. At least 65% of the Portfolio's assets will always be invested
in U.S. Treasury securities. The remainder of the Portfolio's assets may include
securities issued by the U.S. Treasury and other government agencies, such as
the Government National Mortgage Association (GNMA), the Small Business
Administration, and the Federal Financing Bank.

         The Federal Portfolio invests in securities whose interest and
principal payments are backed by the full faith and credit of the U.S.
government or by an agency of the government (these agency securities are not
backed by the full faith and credit of the U.S. government). These agencies
include, among others, the Federal Home Loan Bank, the Federal National Mortgage
Association (FNMA), the Tennessee Valley Authority, and the Federal Land Bank.

   
         The Prime Portfolio invests in certificates of deposit, bankers
acceptances, commercial paper, and other money market securities rated Prime-1
by Moody's Investors Service, Inc., or A-1 by Standard & Poor's Corporation.
Securities that are unrated must be issued by a corporation with a debt rating
of Aa3 or better by Moody's or AA- or better by Standard & Poor's. The Prime
Portfolio also invests in short-term corporate, state, and municipal obligations
rated Aa3 or better by Moody's or AA- or better by Standard & Poor's; and
securities that are considered suitable for the Federal Portfolio (see the
previous paragraph). 
    

         The Prime Portfolio may also invest in Eurodollar and Yankee
obligations, which are certificates of deposit issued in U.S. dollars by foreign
banks and foreign branches of U.S. banks. Eurodollar and Yankee obligations have
the same risks, such as income risk and credit risk, as U.S. money market
instruments. Other risks of Eurodollar and Yankee obligations include the
possibility that a foreign government will not let U.S. dollar-denominated
assets leave the country; the possibility that the banks that issue Eurodollar
obligations may not be subject to the same regulations as U.S. banks; and the
possibility that adverse political or economic developments will affect
investments in a foreign country. Before the Portfolio's adviser selects a
Eurodollar or Yankee obligation, however, any foreign issuer undergoes the same
credit-quality analysis and tests of financial strength as the issuers of
domestic securities.


                                PLAIN TALK ABOUT
                            MONEY MARKET INSTRUMENTS

The term "money market instruments" refers to a variety of short-term
investments, usually with a maturity of 13 months or less. Some common types are
Treasury bills and notes, which are securities issued by the U.S. government;
commercial paper, which is a promissory note issued by a large company or
financial firm; bankers acceptances, which are credit instruments guaranteed by
a bank; and negotiable certificates of deposit, which are issued by banks in
large denominations.

                                PLAIN TALK ABOUT
                           CREDIT QUALITY AND RATINGS

A money market instrument's credit quality depends upon the issuer's ability to
pay interest on the security and, ultimately, to repay the debt. The lower the
rating by one of the independent bond-rating agencies (for example, Moody's or
Standard & Poor's), the greater the chance (in the rating agency's opinion) the
security's issuer will default, or fail to meet its payment obligations. Direct
U.S. Treasury obligations (that is, securities backed by the U.S. government)
carry the highest credit ratings. All things being equal, money market
instruments with greater credit risk offer higher yields.




                                       9
<PAGE>   14
                                PLAIN TALK ABOUT
                              REPURCHASE AGREEMENTS

A means of investing money for a short period, repurchase agreements are
contracts in which a U.S. commercial bank or securities dealer sells government
securities and agrees to repurchase the securities on a specific date (normally
the next business day) and at a specific price.


                                PLAIN TALK ABOUT
                                   DERIVATIVES

A derivative is a financial contract whose value, or interest rate, is based on
(or "derived" from) a traditional security (such as a stock or bond), money
market benchmark (such as U.S. Treasury bill rates or Federal Funds Effective
Rate), an asset (such as a commodity like gold), or a market index (such as the
S&P 500 Index).
   

         In addition, each Portfolio may invest up to 10% of its net assets in
restricted or illiquid securities that may not have price quotations immediately
available. Restricted or illiquid securities are not freely marketable or are
subject to legal restrictions on their sale.
    

[FLAG]   EACH PORTFOLIO IS SUBJECT, TO A LIMITED EXTENT, TO CREDIT RISK, WHICH
         IS THE POSSIBILITY THAT THE ISSUER OF A SECURITY WILL BE UNABLE TO
         REPAY INTEREST AND PRINCIPAL IN A TIMELY MANNER.

         The three Portfolios differ mainly in terms of credit risk. In absolute
terms, each Portfolio's credit quality is very high.

         In relative terms, the Treasury Money Market Portfolio, which invests
in securities backed by the full faith and credit of the U.S. Government, offers
the lowest credit risk -- and generally the lowest yield -- of the three
Portfolios.

         Not all of the securities included in the Federal Portfolio are backed
by the full faith and credit of the U.S. government, and so the Portfolio's
potential credit risk and yield are somewhat higher than the Treasury Money
Market Portfolio.

         While the credit quality of its securities is very high, the Prime
Portfolio invests in money market securities of private financial and
nonfinancial corporations; therefore, it offers the highest credit risk and
generally the highest yield of the three Portfolios.

         Bear in mind that, while each Portfolio invests in high-quality money
market instruments, the three Portfolios are not insured or guaranteed by the
FDIC or any other agency of the U.S. government.

[FLAG]   THE PRIME AND FEDERAL PORTFOLIOS RESERVE THE RIGHT TO INVEST IN
         REPURCHASE AGREEMENTS, WHICH ARE SUBJECT TO SPECIFIC RISKS.
   

         Repurchase agreements carry several risks. For instance, if the seller
is unable to repurchase the securities as promised, the Portfolio may experience
a loss when trying to sell the securities to another person. Or, if the seller
becomes insolvent, a bankruptcy court may determine that the securities do not
belong to the Portfolio and order that the securities be sold to pay off the
seller's debts. The Portfolio's adviser believes that these risks can be
controlled through careful security selection and monitoring.
    

[FLAG]   THE PORTFOLIOS RESERVE THE RIGHT TO INVEST, TO A LIMITED EXTENT, IN
         FLOATING-RATE SECURITIES, WHICH ARE TRADITIONAL TYPES OF DERIVATIVES.



                                       10
<PAGE>   15
         A floating-rate security's interest rate, as the name implies, is not
set; instead, it fluctuates periodically. Generally, the security's yield is
based on a U.S. dollar-based interest-rate benchmark such as the Federal Funds
Rate, the 90-day Treasury bill rate, or the London Interbank Offered Rate
(LIBOR). These securities reset their yields on a periodic basis (for example,
daily, weekly, or quarterly) and are closely correlated to changes in money
market interest rates.

         The Portfolios will not use derivatives for speculative purposes or as
leveraged investments that magnify the risks of an investment.

PORTFOLIO TURNOVER

Because of the short-term nature of money market instruments, the turnover rate
for each Portfolio is expected to be high. This high turnover rate should not
increase Portfolio costs, however, since brokerage commissions are not usually
charged for the purchase or sale of money market instruments.

INVESTMENT LIMITATIONS

To reduce risk and maintain diversification, the Portfolios have adopted limits
on some of their investment policies. Specifically, each Portfolio will not:

- -        Invest more than 5% of its assets in the securities of any one issuer,
         excluding the U.S. government.

- -        Buy more than 10% of any class of securities of any issuer.

- -        Invest more than 25% of its assets in any one industry, excluding
         obligations of the U.S. government, certificates of deposit, and U.S.
         bankers acceptances.

- -        Borrow money from a bank, except for temporary or emergency purposes.
         Amounts borrowed will not exceed 15% of the Portfolio's net assets.
         When borrowing exceeds 5% of the Portfolio's total net assets, the
         Portfolio will not make additional investments. In borrowing, each
         Portfolio may be leveraged and may rise or fall in value more rapidly.

   
         The limitations listed in this prospectus and in the Statements of
Additional Information are fundamental and may be changed only by approval of a
majority of the Portfolios' shareholders.
    


INVESTMENT PERFORMANCE

The Portfolios invest in short-term securities; therefore, their performance is
closely correlated to short-term interest rates. Historically, short-term
interest rates' up-and-down fluctuations have been influenced primarily by
Federal Reserve policy and by market supply and demand.

                                PLAIN TALK ABOUT
                                PAST PERFORMANCE

Whenever you see information on a fund's performance, do not consider the
figures to be an indication of the performance you could expect by making an
investment in the fund today. The past is an imperfect guide to the future;
history does not repeat itself in neat, predictable patterns.

                                       11
<PAGE>   16

                          AVERAGE ANNUAL TOTAL RETURNS
                           FOR PERIODS ENDED 11/30/96

   
<TABLE>
<CAPTION>


                              1 YEAR           5 YEARS         10 YEARS
                              ------           -------         --------
<S>                           <C>              <C>             <C>
TREASURY MONEY MARKET
  PORTFOLIO*                   5.1%              4.1%            5.6%

LIPPER U.S. TREASURY MONEY
  MARKET AVERAGE               4.8%              3.9%            5.4%

<CAPTION>

                              1 YEAR           5 YEARS         10 YEARS
                              ------           -------         --------
<S>                           <C>              <C>             <C>
FEDERAL PORTFOLIO              5.2%              4.3%            5.8%

LIPPER U.S. GOVERNMENT   
  MONEY MARKET AVERAGE         4.8%              3.9%            5.4%


<CAPTION>

                              1 YEAR           5 YEARS         10 YEARS
                              ------           -------         --------
<S>                           <C>              <C>             <C>
PRIME PORTFOLIO                5.3%              4.4%            6.0%

LIPPER NON-GOVERNMENT    
  MONEY MARKET AVERAGE         4.8%              3.9%            5.5%
</TABLE>
    




*Formerly known as Vanguard Money Market Reserves - U.S. Treasury Portfolio.

         The results shown above represent the Portfolios' "average annual total
return" performance, which assumes that any distributions of dividends were
reinvested for the indicated periods. Also included is comparative information
on industry money market averages. The chart does not make any allowance for
federal, state, or local income taxes that shareholders must pay on a current
basis.

                                       12
<PAGE>   17
SHARE PRICE

Each Portfolio's share price, called its net asset value, is expected to remain
at a constant $1.00. Although the stable share price is not guaranteed, the
Portfolios are managed and securities are purchased to maintain that price.


DIVIDENDS AND TAXES

Each Portfolio's dividends accrue daily. On the first business day of every
month, the Portfolios distribute to shareholders virtually all of their income
from interest as dividend distributions. As a shareholder, you are entitled to
your share of a Portfolio's income from interest and dividends. You can receive
income distributions in cash, or you may have them automatically reinvested in
more shares of the Portfolio. In either case, distributions that are earned in
December -- even if paid to you in January -- are taxed as if they had been paid
in December. Vanguard will process your dividend distributions and send you a
statement each year showing the tax status of all of your distributions. 

- -        The dividends that you receive are taxable to you as ordinary dividend
         income whether received in cash or reinvested in additional shares.

- -        Distributions of dividends may be subject to state and local taxes as
         well. However, depending on your state's tax rules, the portion of a
         Portfolio's dividends that come from U.S. Treasury securities and other
         "direct" U.S. Treasury obligations may be exempt from state and local
         income taxes. The Portfolios will notify you each year how much, if
         any, of your distribution may qualify for this exemption.

- -        As a part of a Delaware business trust and a portfolio made up of
         direct U.S. government obligations, the Treasury Money Market Portfolio
         should be exempt from any intangibles taxes to the extent that its
         securities are direct U.S. government obligations. The Portfolio will
         notify you each year how much, if any, of the Portfolio's assets
         qualify for this exemption.

         The tax information in this prospectus is provided as general
information. You should consult your own tax adviser about the tax consequences
of an investment in one or more of the Portfolios.


THE FUNDS AND VANGUARD
   
Vanguard Treasury Fund and Vanguard Money Market Reserves are members of The
Vanguard Group, a family of more than 30 investment companies with more than 90
distinct investment portfolios and total net assets of more than $250 billion.
All of the Vanguard funds share in the expenses associated with business
operations, such as personnel, office space, equipment, and advertising.
    
                                PLAIN TALK ABOUT
                      VANGUARD'S UNIQUE CORPORATE STRUCTURE

The Vanguard Group, Inc. is the only MUTUAL mutual fund company. It is owned
jointly by the funds it oversees and by the shareholders in those funds. Other
mutual funds are operated by for-profit management companies that may be owned
by one person, by a group of individuals, or by investors who bought the
management company's publicly traded stock. Because of its structure, Vanguard
operates its funds at cost. Instead of distributing profits from operations to a
separate management company, Vanguard returns profits to fund shareholders in
the form of lower operating expenses. 

                                       13
<PAGE>   18
                                PLAIN TALK ABOUT
                             THE PORTFOLIOS' ADVISER

Vanguard Fixed Income Group provides investment advisory services to some 40
Vanguard Portfolios; as of November 30, 1996, the Group managed some $78 billion
in assets.

         The managers responsible for the Portfolios' investments are:

   
         IAN A. MACKINNON, Senior Vice President of Vanguard; 23 years
fixed-income investment experience, 17 years primary responsibility for
Vanguard's internal fixed-income policy and strategy; B.A. from Lafayette
College, M.B.A. from Pennsylvania State University.
    

   
         ROBERT F. AUWAERTER, Principal of Vanguard and Portfolio Manager; 19
years fixed-income investment experience; B.S., the University of Pennsylvania,
M.B.A., Northwestern University.
    

   
         JOHN HOLLYER, Principal of Vanguard and Portfolio Manager; 10 years
fixed-income investment experience; B.S. from the University of Pennsylvania.
    

         Mr. Auwaerter and Mr. Hollyer manage the Portfolios on a day-to-day
basis. Mr. MacKinnon is responsible for setting the Portfolios' broad investment
policies and for overseeing the Portfolio managers.


         Vanguard also provides marketing services to the funds. Although
shareholders do not pay sales commissions or 12b-1 marketing fees, each fund
pays its allocated share of The Vanguard Group's costs.

   
         A list of each Fund's directors (or trustees) and officers, and their
present positions and principal occupations during the past five years, can be
found in each Fund's Statement of Additional Information.
    


INVESTMENT ADVISER

   
Vanguard Fixed Income Group, P.O. Box 2600, Valley Forge, PA 19482, provides
advisory services on an at-cost basis to the Treasury Money Market, Federal, and
Prime Portfolios. For the year ended November 30, 1996, the three Portfolios
paid a total of $3,238,000 in investment advisory expenses ($338,000 for the
U.S. Treasury Portfolio, $343,000 for the Federal Portfolio, and $2,557,000 for
the Prime Portfolio).
    

         The Group places all orders for purchases and sales for Portfolio
securities, and is directed to get the best available price and most favorable
execution with respect to all transactions.


GENERAL INFORMATION

Vanguard Money Market Reserves, Inc. is organized as a corporation under the
laws of the state of Maryland. Until December 2, 1996, the Treasury Money Market
Portfolio was a Portfolio of Vanguard Money Market Reserves, known as the U.S.
Treasury Portfolio. On that date, the Treasury Money Market Portfolio was
reorganized -- through a transfer of assets into a Portfolio of Vanguard
Treasury Fund, a Delaware business trust.


         Shareholders of the Funds have rights and privileges similar to those
enjoyed by other corporate shareholders. For example, shareholders will not be
responsible for any liabilities of the trust or corporation. If any matters are
to be voted on by shareholders (such as a change in a fundamental investment
objective or the election of directors or trustees), each share outstanding at
that point would be entitled to one vote. Annual meetings will not be held by
the Funds except as required by the Investment Company Act of 1940. A meeting
will be scheduled (for example, to vote on the removal of a director or trustee)
if the holders of at least 10% of the Fund's shares request a meeting in
writing. 

                                       14
<PAGE>   19
INVESTING WITH VANGUARD

Are you looking for the most convenient way to open or add money to a Vanguard
account? Obtain instant access to fund information? Establish an account for a
minor child or for your retirement savings?

         Vanguard can help. Our goal is to make it easy and pleasant for you to
do business with us.

         The following sections of the prospectus briefly explain the many
services we offer you as a shareholder of the Treasury Money Market, Federal, or
Prime Portfolios. Booklets providing detailed information are available on the
services marked with a [BOOK ICON]. Please call us to request copies.

SERVICES AND ACCOUNT FEATURES

Vanguard offers many services that make it convenient to buy, sell, or exchange
shares.

TELEPHONE REDEMPTIONS               Automatically set up for these Portfolios
(SALES AND EXCHANGES)               unless you notify us otherwise.


CHECKWRITING                        Method for drawing money from your account
                                    by writing a check for $250 or more.

VANGUARD DIRECT DEPOSIT             Automatic method for depositing your
SERVICE                             paycheck or U.S. government payment
[BOOK ICON]                         (including Social Security and government
                                    pension checks) into your account.*


VANGUARD AUTOMATIC EXCHANGE         Automatic method for moving a fixed amount
SERVICE                             of money from one Vanguard fund account to
[BOOK ICON]                         another.*



VANGUARD FUND EXPRESS               Electronic method for buying or selling
[BOOK ICON]                         shares. You can transfer money between your
                                    Vanguard fund account and an account at your
                                    bank, savings and loan, or credit union on a
                                    systematic schedule or whenever you wish.*

VANGUARD DIVIDEND EXPRESS           Electronic method for transferring dividends
[BOOK ICON]                         directly from your Vanguard fund account to
                                    your bank, savings and loan, or credit union
                                    account, or to another Vanguard fund
                                    account.

VANGUARD BROKERAGE SERVICES         A cost-effective way to trade stocks, bonds,
(VBS)                               and options on major exchanges, Nasdaq, and
[BOOK ICON]                         other domestic over-the-counter markets at
                                    reduced rates, and to buy and sell shares of
                                    non-Vanguard mutual funds. Call VBS
                                    (1-800-992-8327) for additional information
                                    and the appropriate forms.

*Can be used to invest a fixed amount on a regular basis or to contribute to an
IRA or other retirement plan.

    INVESTOR INFORMATION 1-800-662-7447 -- CLIENT SERVICES 1-800-662-2739 --
                          TELE-ACCOUNT 1-800-662-6273

                                       15
<PAGE>   20
TYPES OF ACCOUNTS

INDIVIDUAL OR OTHER ENTITY

Vanguard's account registration form can be used to establish a variety of
non-retirement accounts.

FOR ONE OR MORE PEOPLE              To open an account in the name of one
                                    (individual) or more (joint tenants) people.
                                    $3,000 minimum initial investment.

   
FOR A MINOR CHILD                   To open an account as an UGMA/UTMA (Uniform
  [BOOK ICON]                       Gifts/Transfers to Minors Act). Age of
                                    majority and other requirements are set by
                                    state law. $1,000 minimum initial
                                    investment.
    

FOR HOLDING TRUST ASSETS            To invest assets held in an existing trust.
  [BOOK ICON]                       $3,000 minimum initial investment.


FOR THIRD-PARTY TRUSTEE             To open an account as a retirement trust or
RETIREMENT INVESTMENTS              plan based on an existing corporate or
(Vanguard is not the custodian      institutional plan. These accounts are
or trustee.)                        established by the custodian or trustee of
                                    the existing plan.


FOR AN ORGANIZATION                 To open an account as a corporation,
                                    partnership, or other entity. These accounts
                                    may require a corporate resolution or other
                                    documents to name the individuals authorized
                                    to act. $3,000 minimum initial investment.


RETIREMENT

You establish these accounts with a Vanguard adoption agreement -- not a
Vanguard account registration form. To request the appropriate adoption
agreement and forms, or to ask questions about investing for retirement, call
Investor Information.

FOR AN INDIVIDUAL RETIREMENT        To open a retirement account in the name of
ACCOUNT (IRA)                       an individual. IRAs can be established with
(Vanguard Fiduciary Trust           a contribution, a direct rollover from an
Company is the custodian.)          employer's plan, such as a 401(k), or an
                                    asset transfer or rollover from another
                                    financial institution, such as a bank or
                                    mutual fund company. $1,000 minimum initial
                                    investment.

FOR A SIMPLIFIED EMPLOYEE           To open a retirement account in the name of
PENSION PLAN ACCOUNT (SEP-IRA)      an employee. SEPs allow employers to make
(Vanguard Fiduciary Trust           deductible contributions directly to IRAs
Company is the custodian.)          established by their employees. A SEP can be
                                    established by people who are self-employed,
                                    small-business owners, partnerships, or
                                    corporations.

 INVESTOR INFORMATION  1-800-662-7447  --  CLIENT SERVICES  1-800-662-2739  --
                          TELE-ACCOUNT  1-800-662-6273


                                       16
<PAGE>   21
TYPES OF ACCOUNTS (continued)
   
FOR A SAVINGS INCENTIVE MATCH       To open a retirement account in the name of
PLAN FOR EMPLOYEES ACCOUNT          an employee. Created as part of the Small
(SIMPLE-IRA)                        Business Job Protection Act of 1996, SIMPLEs
(Vanguard Fiduciary Trust           replace SAR-SEPs. SIMPLEs are exclusively
Company is the custodian.)          for employers that had 100 or fewer
                                    employees in the most recent calendar year
                                    and that do not maintain another
                                    employer-sponsored retirement plan. A SIMPLE
                                    can be established by people who are
                                    self-employed, small business owners,
                                    partnerships, or corporations. Salary
                                    reduction contributions may be made by the
                                    employee, with matching or non-matching
                                    contributions from the employer.
    

   
FOR A QUALIFIED RETIREMENT          To open a retirement account that allows
PROGRAM ACCOUNT                     small-business owners or people who are
(Vanguard Fiduciary Trust           self-employed to make tax-deductible
Company can be the trustee.)        retirement contributions for themselves and
                                    their employees into Profit-Sharing and
                                    Money Purchase Pension (Keogh) plans.
    

FOR A 403(b)(7) CUSTODIAL           To open a retirement account that allows
ACCOUNT                             employees of tax-exempt institutions (for
(Vanguard Fiduciary Trust           example, schools or hospitals) to make
Company is the custodian.)          pre-tax retirement contributions.


DISTRIBUTION OPTIONS

You can receive your dividend distributions in one of two ways:

REINVESTMENT                        Dividends are automatically reinvested in
                                    additional shares of the Portfolio unless
                                    you request a different distribution method.

DIVIDENDS IN CASH                   Dividends are paid by check and mailed to
                                    your account's address of record.

To electronically transfer cash dividends to your bank, savings and loan, or
credit union account, or to another Vanguard fund account, see Vanguard Dividend
Express under "Services and Account Features."

BUYING SHARES

You buy your Portfolio shares at a net asset value of $1.00 per share. Before it
can begin earning dividends, your investment must be converted to federal funds,
which usually takes one business day. (Federal funds are Federal Reserve
deposits that banks and other financial institutions "borrow" from one another
to meet short-term cash needs; portfolio advisers must use federal funds to pay
for the securities they buy.) You begin earning dividends the calendar day after
the Portfolio receives the federal funds.

         The Portfolios are offered on a no-load basis, meaning that you do not
pay sales commissions or 12b-1 marketing fees.

 INVESTOR INFORMATION  1-800-662-7447  --  CLIENT SERVICES  1-800-662-2739  --
                          TELE-ACCOUNT  1-800-662-6273

                                       17
<PAGE>   22
BUYING SHARES (continued)

MINIMUM INVESTMENT                                    

BY MAIL
[envelope icon]
FIRST-CLASS mail to:
The Vanguard Group
P.O. Box 2600
Valley Forge, PA 19482

EXPRESS or REGISTERED mail to:
The Vanguard Group
455 Devon Park Drive
Wayne, PA 19087


OPEN A NEW ACCOUNT

$3,000 (regular account); $1,000 (IRAs and custodial accounts for minors)

Complete and sign the application form.


Make your check payable to: 
The Vanguard Group--(appropriate Portfolio number; see below)
Treasury Money Market  50
Federal                33
Prime                  30


All purchases must be made in U.S. dollars, and checks must be drawn on 
U.S. banks.


ADD TO AN EXISTING ACCOUNT

$100 by mail or exchange; $1,000 by wire.

Mail your check with an Invest-By-Mail form detached from your confirmation
statement to the address listed on the form.

Make your check payable to: 
The Vanguard Group--(appropriate Portfolio number; see below)
Treasury Money Market  50
Federal                33
Prime                  30


All purchases must be made in U.S. dollars, and checks must be drawn on 
U.S. banks.

If Vanguard receives your check by 4 p.m., Eastern time (the close of trading on
the New York Stock Exchange), your investment is converted to federal funds the
following business day, and you begin earning dividends the next calendar day.
(For instance, if we received your check before 4 p.m. on a Thursday, your
account would be credited Friday, and you would begin earning dividends
Saturday.) 

        If the check arrives after 4 p.m. Eastern time, your account is
credited after two business days, and you begin earning dividends the calendar
day after that. (If we received your check after 4 p.m. on a Thursday, your
account would be credited Monday, and you would begin earning dividends
Tuesday.) 

IMPORTANT NOTE: To prevent check fraud, Vanguard will not accept checks made
payable to third parties.


BY TELEPHONE
[telephone icon]      
1-800-662-6273
Vanguard Tele-Account(R)
1-800-662-2739
Client Services


OPEN A NEW ACCOUNT

Call Vanguard Tele-Account* 24 hours a day--or Client Services during
business hours--to exchange from another Vanguard fund account with the same
registration (name, address, taxpayer I.D., and account type).

ADD TO AN EXISTING ACCOUNT

Call Vanguard Tele-Account* 24 hours a day--or Client Services during business
hours--to exchange from another Vanguard fund account with the same
registration (name, address, taxpayer I.D., and account type).

Use Vanguard Fund Express (see "Services and Account Features") to transfer
assets from your bank account. Call Client Services before your first use to
verify that this option is in place.

*You must obtain a Personal Identification Number through Tele-Account at least
seven days before you request your first exchange.

If you buy Portfolio shares through an exchange from another Vanguard fund by 4
p.m. Eastern time, your investment does not have to be converted to federal
funds; you begin earning dividends the next calendar day.

IMPORTANT NOTE: Once a telephone transaction has been approved by you and a
confirmation number assigned, it cannot be revoked. We reserve the right to
refuse any purchase.

 INVESTOR INFORMATION  1-800-662-7447  --  CLIENT SERVICES  1-800-662-2739  --
                          TELE-ACCOUNT  1-800-662-6273

                                       18
<PAGE>   23
BUYING SHARES (continued)

<TABLE>
<CAPTION>


<S>                                   <C>                                               <C>
BY WIRE                               Call Client Services to arrange your              Call Client Services to arrange your
                                      wire transaction.                                 wire transaction.
Wire to:
CoreStates Bank, N.A.                 Wire transactions are not available               Wire transactions are not available
ABA 031000011                         for retirement accounts.                          for retirement accounts.
CoreStates No 01446936
[Temporary Account Number]
Vanguard Treasury Fund OR
Vanguard Money Market Reserves      
[Account Registration]
Attention Vanguard

</TABLE>

If you buy Portfolio shares through a federal funds wire, your investment
begins earning dividends the next calendar day. You can begin earning dividends
immediately if you notify Vanguard by 10:45 a.m. Eastern time that you intend to
make a wire purchase that day.

<TABLE>

<S>                                   <C>                                               <C>
AUTOMATICALLY                                     --                                    Vanguard offers a variety of ways
                                                                                        that you can add to your account
                                                                                        automatically. See "Services and
                                                                                        Account Features."
</TABLE>


   
You can redeem (that is, sell or exchange) shares purchased by check or Vanguard
Fund Express at any time. However, while your redemption request will be
processed as soon as it is received, your redemption proceeds will not be
available until payment for your purchase is collected, which may take up to ten
calendar days. 
    

NOTE: If you buy Portfolio shares through a registered broker-dealer or
investment adviser, the broker-dealer or adviser may charge you a service fee.

         It is important that you call Vanguard before you invest a large dollar
amount by wire or check. We must consider the interests of all Portfolio
shareholders and so reserve the right to delay or refuse any purchase that will
disrupt the Portfolio's operation or performance.

REDEEMING SHARES

IMPORTANT TAX NOTE: Any sale or exchange of shares in a non-retirement account
could result in a taxable gain or a loss. However, because the Portfolios seek
to maintain a stable net asset value of $1.00 per share, you will not incur a
taxable gain or loss when you sell or exchange shares of these Portfolios.

The ability to redeem (that is, sell or exchange) Portfolio shares by telephone
is automatically established for your account unless you tell us in writing that
you do not want this option.

         To protect your account from unauthorized or fraudulent telephone
instructions, Vanguard follows specific security procedures. When we receive a
call requesting an account transaction, we require the caller to provide:

         /x/      Portfolio name.

         /x/      10-digit account number.

         /x/      Name and address exactly as registered on that account.

   
         /x/      Social Security or employer identification number as
                  registered on that account.
    

         If you call to sell shares, the sale proceeds will be made payable to
you, as the registered shareholder, and mailed to your account's address of
record.

   
         If we follow reasonable security procedures, neither the Portfolio nor
Vanguard will be responsible for the authenticity of transaction instructions
received by telephone. We believe that

    INVESTOR INFORMATION 1-800-662-7447 -- CLIENT SERVICES 1-800-662-2739 --
                          TELE-ACCOUNT 1-800-662-6273                      

                                       19
<PAGE>   24
REDEEMING SHARES (continued)

these procedures are reasonable and that, if we follow them, you bear the risk
of any losses resulting from unauthorized or fraudulent telephone transactions
on your account.
    

HOW TO SELL SHARES

You may withdraw any part of your account, at any time, by selling shares.

   
         One way to sell shares is the checkwriting option (established when you
set up your account or by calling Client Services). Your personalized Vanguard
checks work in much the same way as bank checks, except that Vanguard checks are
considered drafts and cannot be cashed immediately like a bank check. You cannot
write a Vanguard check to redeem shares that you purchased by check within the
previous ten days.
    

         When you sell shares by telephone or mail, sale proceeds are normally
mailed within two business days after Vanguard receives your request in good
order. Good order means that the request includes:

   /x/  Portfolio name and account number.

   /x/  Amount of the transaction (in dollars).

   /x/  Signatures of all owners exactly as registered on the account.

   /x/  Signature guarantees (if required).

   /x/  Any supporting legal documentation that may be required.

   /x/  Any certificates you are holding for the account.

         Sales or exchange requests received after the close of trading on the
New York Stock Exchange (generally 4 p.m. Eastern time) are processed the next
business day.

         The Portfolios reserve the right to close any non-retirement or
UGMA/UTMA account whose balance falls below the minimum initial investment. The
Portfolios will deduct a $10 annual fee if your non-retirement account balance
falls below $2,500 or if your UGMA/UTMA account balance falls below $500. The
fee is waived if your total Vanguard account assets are $50,000 or more.

   
Some written requests require a signature guarantee from a bank, broker, or
other acceptable financial institution. A notary public cannot provide a
signature guarantee.
    

HOW TO EXCHANGE SHARES

An exchange is the selling of shares of one Vanguard fund to purchase shares of
another.

         Although we make every effort to maintain the exchange privilege,
Vanguard reserves the right to revise or terminate the exchange privilege, limit
the amount of an exchange, or reject any exchange, at any time, without notice.

         Before you exchange into a new Vanguard fund, be sure to read its
prospectus. For a copy and for answers to questions you might have, call
Investor Information.

    INVESTOR INFORMATION 1-800-662-7447 -- CLIENT SERVICES 1-800-662-2739 --
                          TELE-ACCOUNT 1-800-662-6273

                                       20
<PAGE>   25
REDEEMING SHARES (continued)
SELLING OR EXCHANGING SHARES        ACCOUNT TYPE

BY TELEPHONE                        ALL TYPES EXCEPT RETIREMENT:
[PHONE ICON]                        Call Vanguard Tele-Account* 24 hours a 
1-800-662-6273                      day -- or Client Services during business
Vanguard Tele-Account               hours -- to sell or exchange shares. You can
1-800-662-2739                      exchange shares from any of these Portfolios
Client Service                      to open an account in another Vanguard fund
                                    or to add to an existing Vanguard fund
                                    account with an identical registration.

                                    RETIREMENT:

                                    You can exchange -- but not sell -- shares
                                    by calling Tele-Account or Client Services.

                                    *You must obtain a Personal Identification
                                    Number through Tele-Account at least seven
                                    days before you request your first
                                    redemption.

BY MAIL                             ALL TYPES EXCEPT RETIREMENT:
[ENVELOPE ICON]                     Send a letter of instruction signed by all
FIRST CLASS mail to:                registered account holders. Include the
The Vanguard Group                  Portfolio name and account number and (if
Vanguard Treasury Fund OR           you are selling) a dollar amount OR (if you
Vanguard Money Market Reserves      are exchanging) the name of the fund you
P.O. Box 1120                       want to exchange into and a dollar amount.
Valley Forge, PA 19482
                                    RETIREMENT:
                                                              
EXPRESS or REGISTERED mail to:      For information on how to request           
The Vanguard Group                  distributions from . . .                    
Vanguard Treasury Fund OR                                                       
Vanguard Money Market Reserves      -        IRAs, call Client Services.        
455 Devon Park Drive                                                            
Wayne, PA 19087                     -        SEP-IRAs, 403(b)(7) custodial      
                                             accounts, and Profit-Sharing and   
                                             Money Purchase Pension (Keogh)     
                                             Plans, call Individual Retirement  
                                             Services at 1-800-662-2003.        
                                                                                
                                    Depending on your account registration type,
                                    additional documentation may be required.   


BY CHECK                            ALL TYPES EXCEPT RETIREMENT:                
[CHECK ICON]                        You can sell shares by writing a check for 
                                    $250 or more.
                                                        
                                    RETIREMENT:                                 
                                    Checkwriting is not available for retirement
                                    accounts.

AUTOMATICALLY                       ALL TYPES EXCEPT RETIREMENT: 
[AUTO ICON]                         Vanguard offers several ways to sell or 
                                    exchange shares automatically (see "Services
                                    and Account Features"). Call Investor
                                    Information for the appropriate booklet and
                                    application if you did not elect a feature
                                    when you opened your account.

         It is important that you call Vanguard before you redeem a large dollar
amount. We must consider the interests of all Portfolio shareholders and so
reserve the right to delay your redemption proceeds -- up to seven days -- if
the amount will disrupt a Portfolio's operation or performance.
                                                                    
                        A NOTE ON UNUSUAL CIRCUMSTANCES

Vanguard reserves the right to revise or terminate the telephone redemption
privilege at any time, without notice. In addition, Vanguard can stop selling
shares 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. If you experience difficulty making a
telephone redemption during periods of drastic economic or market change, you
can send us your request by regular or express mail. Follow the instructions on
selling or exchanging shares by mail in the "Redeeming Shares" section.

    INVESTOR INFORMATION 1-800-662-7447 -- CLIENT SERVICES 1-800-662-2739 --
                          TELE-ACCOUNT 1-800-662-6273

                                       21

                                   
                                    
                                  
                                   
                                    
                                         
                                   
                                   
                            
                              
<PAGE>   26
FUND AND ACCOUNT UPDATES

STATEMENTS AND REPORTS

We will send you clear, concise account and tax statements to help you keep
track of your Portfolio account throughout the year, as well as when you are
preparing your income tax returns.

         In addition, you will receive financial reports about the Treasury
Money Market, Federal, and Prime Portfolios twice a year. These comprehensive
reports include an assessment of each Portfolio's performance (and a comparison
to its industry benchmark), an overview of the markets, a report from the
adviser, as well as a listing of its holdings and other financial statements.

   
CONFIRMATION STATEMENT              Sent each time you buy, sell, or exchange
                                    shares; confirms the trade date and the
                                    amount of your transaction.
    

PORTFOLIO SUMMARY                   Mailed quarterly; shows the market value of
                                    your account at the close of the statement
                                    period, as well as distributions, purchases,
                                    sales, and exchanges for the current
                                    calendar year.

FUND FINANCIAL REPORTS              Mailed in January and July for these
                                    Portfolios.

TAX STATEMENTS                      Generally mailed in January; report previous
                                    year's dividend distributions as well as
                                    distributions from IRAs or other retirement
                                    accounts.

AUTOMATED TELEPHONE ACCESS

VANGUARD TELE-ACCOUNT               Toll-free access to Vanguard fund and
1-800-662-6273                      account information -- as well as some
Any time, seven days a week,        transactions -- through any TouchTone(TM)
from anywhere in the continental    telephone. Tele-Account provides total
United States and Canada.           return, share price, price change, and yield
[BOOK ICON]                          quotations for all Vanguard funds; gives
                                    your account balances and history (e.g.,
                                    last transaction, latest dividend
                                    distribution, redemptions by check during
                                    the last three months); and allows you to
                                    sell or exchange fund shares.

COMPUTER ACCESS

VANGUARD ON THE                     Use your personal computer to visit
WORLD WIDE WEB                      Vanguard's education-oriented website,
http://www.vanguard.com             which provides timely news and information
                                    about Vanguard funds and services; an
                                    on-line "university" that offers a variety
                                    of mutual fund classes; and easy-to-use,
                                    interactive tools to help you create your
                                    own investment and retirement strategies.

VANGUARD ONLINE(SM)                 Use your personal computer to learn more
KEYWORD: Vanguard                   about Vanguard funds and services; keep in
                                    touch with your Vanguard accounts; map out a
                                    long-term investment strategy; and ask
                                    questions, make suggestions, and send
                                    messages to Vanguard. Vanguard Online is
                                    offered through America Online(R) (AOL). To
                                    establish an AOL account, call
                                    1-800-238-6336.
   
    

    INVESTOR INFORMATION 1-800-662-7447 -- CLIENT SERVICES 1-800-662-2739 --
                          TELE-ACCOUNT 1-800-662-6273


                                       22
<PAGE>   27
PROSPECTUS POSTSCRIPT

This prospectus is designed to provide you with pertinent information about the
Treasury Money Market, Federal, and Prime Portfolios, including their investment
objectives, risks, strategies, and expenses, as well as services available to
you as a shareholder.
         It is important that you understand these facts so that you can decide
whether an investment in any of the Portfolios is right for you. The following
questions offer a quick review of some of the subjects covered by this
prospectus.

IN READING THE PROSPECTUS, DID YOU LEARN . . .

         []       Each Portfolio's objectives? (page 7)

         []       Each Portfolio's investment policies? (page 8)

         []       Who should invest in each Portfolio? (page 7)

         []       The risks associated with each Portfolio? (pages 7-10)

         []       Whether each Portfolio is federally insured? 
                  (inside front cover)

         []       Each Portfolio's expenses? (page 3)

         []       The background of the Portfolios' investment managers? 
                  (page 14)

         []       How to open an account? (page 17)

         []       How to sell or exchange shares? (page 19)

   
         []       How often you'll receive statements and financial reports?
                  (page 22)
    
                                PLAIN TALK ABOUT
                             KEEPING YOUR PROSPECTUS

Reading this prospectus will help you to decide whether one or more of the
Portfolios is suitable for your investment goals. If you decide to invest, don't
throw the prospectus out; you will no doubt need it for future reference.


                                       23
<PAGE>   28
                                 ABOUT THE QUIZ

Knowing your risk tolerance is important when you are making an investment
decision. To give you a general idea of your comfort level with investing,
circle the response that most closely matches your personal situation. Keep in
mind, though, that there is no "foolproof" way to accurately gauge your risk
tolerance. Scoring for the quiz is below.


A SIMPLE RISK QUIZ

A.  I HAVE BEEN INVESTING IN STOCK AND BOND MUTUAL FUNDS (OR IN INDIVIDUAL 
    STOCKS OR BONDS) FOR . . .
    1.  Less than a year
    2.  1 - 2 years
    3.  3 - 4 years
    4.  5 - 9 years
    5.  10 years or more

B.  WHEN IT COMES TO INVESTING IN STOCK OR BOND MUTUAL FUNDS (OR INDIVIDUAL 
    STOCKS OR BONDS), I WOULD SAY I'M . . .
    1.  A very inexperienced investor
    2.  A somewhat inexperienced investor
    3.  A somewhat experienced investor
    4.  An experienced investor
    5.  A very experienced investor

C.  I AM COMFORTABLE WITH INVESTMENTS THAT MAY LOSE MONEY FROM TIME TO TIME IF 
    THEY OFFER THE POTENTIAL FOR HIGHER RETURNS.
    1.  I strongly disagree
    2.  I disagree
    3.  I somewhat agree
    4.  I agree
    5.  I strongly agree

D.  I WILL KEEP AN INVESTMENT EVEN IF IT LOSES 10% OF ITS VALUE OVER THE COURSE
    OF A YEAR.
    1.  I strongly disagree
    2.  I disagree
    3.  I somewhat agree
    4.  I agree
    5.  I strongly agree

E.  IN ADDITION TO MY LONG-TERM INVESTMENTS, I HAVE EMERGENCY SAVINGS EQUAL 
    TO ____ MONTHS OF MY TAKE-HOME PAY.
    1.  Zero
    2.  One
    3.  Two
    4.  Three
    5.  Four or more

   
F.  I FIND IT EASY TO PAY MY MONTHLY BILLS FROM MY CURRENT PAY.
    1.  I strongly disagree
    2.  I disagree
    3.  I somewhat agree
    4.  I agree
    5.  I strongly agree
    

G.  OVERALL, MY PERSONAL FINANCIAL SITUATION IS SECURE.
    1.  I strongly disagree
    2.  I disagree
    3.  I somewhat agree
    4.  I agree
    5.  I strongly agree

                              HOW TO SCORE THE QUIZ

Use the number of your answer as the number of points scored. For instance, if
you chose answer #3 to a question, that's worth three points. Add up your points
and check below for the type of investor you are. (Note: if you chose answer #1
or #2 to Question C, subtract five points from your total score.)

- - If you scored between 0 and 25 points, you are considered a conservative
investor.

- - If you scored between 26 and 32 points, you are considered a moderate
investor.

- - If you scored between 33 and 35 points, you are considered an aggressive
investor.


                                       24
<PAGE>   29
GLOSSARY OF INVESTMENT TERMS


   
CASH RESERVES
Cash deposits as well as short-term bank deposits, money market instruments,
bank CDs, repurchase agreements, and U.S. Treasury bills.
    

DIVERSIFICATION
Spreading your investments among many issuers (that is, organizations that sell
securities).

DIVIDEND INCOME
Payment to shareholders of income from interest or dividends generated by the
fund's investments.

EXPENSE RATIO
The percentage of a fund's average net assets used to pay its expenses. The
expense ratio includes management fees, administrative fees, and any 12b-1
marketing fees.

FIXED INCOME SECURITIES
Investments, such as bonds, that have a fixed payment schedule. While the level
of income offered by these securities is predetermined, their prices may
fluctuate.

INVESTMENT ADVISER
An organization that makes the day-to-day decisions regarding a portfolio's
investments.

LIQUIDITY
The degree of a security's marketability (that is, how quickly the security can
be sold at a fair price and converted to cash).

MONEY MARKET FUND
A mutual fund that seeks to provide income, liquidity, and a stable share price
by investing in very short-term, liquid investments.

MUTUAL FUND
An investment company that pools the money of many people and invests it in a
variety of securities in an effort to achieve a specific objective over time.

NET ASSET VALUE (NAV)
The market value of a mutual fund's total assets, minus liabilities, divided by
the number of shares outstanding. The value of a single share is called its
share value or share price. 

PORTFOLIO DIVERSIFICATION 
Holding a variety of securities so that a portfolio's return is not hurt by the
poor performance of a single security.

PRINCIPAL
The amount of your own money you put into an investment.

SECURITIES
Stocks, bonds, money market instruments, and other investment vehicles.

TOTAL RETURN
A percentage change, over a specified time period, in a mutual fund's net asset
value, with the ending net asset value adjusted to account for the reinvestment
of all distributions of dividends and capital gains.

VOLATILITY
The fluctuations in value of a mutual fund or other security. The greater a
fund's volatility, the wider the fluctuations between its high and low prices.

YIELD
Current income (interest or dividends) earned by an investment, expressed as a
percentage of the investment's price.


<PAGE>   30
                             [VANGUARD GROUP LOGO]
                                        
                              Post Office Box 2600
                             Valley Forge, PA 19482


INVESTOR INFORMATION
DEPARTMENT
1-800-662-7447 (SHIP)
TEXT TELEPHONE:
1-800-952-3335
For information on our funds,
fund services, and retirement accounts; requests for
literature

CLIENT SERVICES DEPARTMENT
1-800-662-2739 (CREW)
TEXT TELEPHONE:
1-800-662-2738
For information on your
account, account transactions,
account statements

VANGUARD BROKERAGE
SERVICES
1-800-992-8327
For information on trading
stocks, bonds, and options
at reduced commissions

VANGUARD TELE-ACCOUNT(R) 
1-800-662-6273 (ON-BOARD) 
For 24-hour automated access
to price and yield, information 
on your account, certain 
transactions


ELECTRONIC ACCESS TO THE 
VANGUARD MUTUAL FUND 
EDUCATION AND INFORMATION 
CENTER
   
    
World Wide Web
http://www.vanguard.com

E-mail
[email protected]


   
                                        (C) 1997 Vanguard Marketing  
                                        Corporation, Distributor     
                             
                                        P030N                        
    

<PAGE>   31

VANGUARD MONEY
MARKET PORTFOLIOS

   
Institutional Prospectus
March 26, 1997
    
                           [BACKGROUND SHIP GRAPHIC]

- --------

VANGUARD MONEY MARKET RESERVES

- -   Prime Portfolio

- -   Federal Portfolio


VANGUARD TREASURY 
MONEY MARKET
PORTFOLIO


   
This prospectus contains financial data for the Portfolios through the fiscal
year ended November 30, 1996.
    


                                [VANGUARD LOGO]
<PAGE>   32
VANGUARD MONEY MARKET RESERVES
VANGUARD TREASURY MONEY MARKET PORTFOLIO               MONEY MARKET MUTUAL FUNDS

<TABLE>
<CAPTION>
CONTENTS

<S>                                 <C>
Portfolio Expenses                                  3

Financial Highlights                                5

A Word About Risk                                   7

The Portfolios'
Objectives                                          7

Who Should Invest                                   7

Investment Policies                                 8

Investment Limitations                             11

Investment
Performance                                        11

Share Price                                        13

Dividends and Taxes                                13

The Funds and
Vanguard                                           13

Investment Adviser                                 14

General Information                                14

Investing
with Vanguard

- - For Plan Participants                            15

- - For Other Institutional Investors                15

Accessing Fund Information
by Computer                                        16

Glossary                            Inside Back Cover
</TABLE>


INVESTMENT OBJECTIVES AND POLICIES

Vanguard Money Market Reserves, Inc. is a diversified, open-end investment
company that consists of two separate Portfolios: Federal and Prime. The
Treasury Money Market Portfolio is part of Vanguard Treasury Fund, which is a
diversified, open-end investment company as well.

   Each Portfolio seeks to provide current income and to maintain liquidity and
a stable share price of $1.00. Each Portfolio focuses on specific high-quality,
short-term money market instruments, such as securities backed by the full faith
and credit of the U.S. government, securities issued by U.S. government
agencies, or obligations issued by corporations and financial institutions.

   IT IS IMPORTANT TO NOTE THAT EACH PORTFOLIO SEEKS TO MAINTAIN, BUT DOES NOT
GUARANTEE, A STABLE NET ASSET VALUE OF $1.00 PER SHARE. IN ADDITION, NONE OF THE
PORTFOLIOS' SHARES IS GUARANTEED OR INSURED BY THE FDIC, THE U.S. GOVERNMENT, OR
ITS AGENCIES.


FEES AND EXPENSES

The Portfolios are offered on a no-load basis, which means that you pay no sales
commissions or 12b-1 marketing fees. You will, however, incur expenses for
investment advisory, management, administrative, and distribution services,
which are included in each Portfolio's expense ratio.


IMPORTANT NOTE

This prospectus is intended for institutional clients and for participants in
employer-sponsored retirement or savings plans. Another version -- for
individuals who would like to open a personal account -- can be obtained by
calling Vanguard at 1-800-662-7447.


ADDITIONAL INFORMATION ABOUT THE PORTFOLIOS

   
Statements of Additional Information (dated March 26, 1997) containing more
information about the Portfolios are, by reference, part of this prospectus and
may be obtained without charge by contacting Vanguard (see back cover).
    


WHY READING THIS PROSPECTUS IS IMPORTANT

This prospectus explains the objectives, risks, and policies of the three
Portfolios. To highlight terms and concepts important to mutual fund investors,
we have provided "Plain Talk" explanations along the way. Reading the prospectus
will help you to decide whether one or more of the Portfolios is the right
investment for your needs. We suggest that you keep it for future reference.


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>   33


PORTFOLIO PROFILE                                 Vanguard Money Market Reserves
                                        Vanguard Treasury Money Market Portfolio


WHO SHOULD INVEST (page 7)

- -   Investors seeking a money market mutual fund as part of a balanced and
    diversified investment program.

- -   Investors uncomfortable with share-price fluctuations.

- -   Investors seeking income.

WHO SHOULD NOT INVEST

- -   Investors seeking growth of their investment over time.

- -   Investors looking for a fund that invests in stocks or bonds.

RISKS OF THE PORTFOLIOS (pages 7 - 10)

Each Portfolio is subject to income risk (the chance that falling short-term
interest rates will cause the Portfolios' income -- and thus the Portfolios'
return -- to decline) and manager risk (the chance that poor security selection
will cause a Portfolio to lag similar funds). In addition, while the credit
quality of all three Portfolios is expected to be very high, each Portfolio is
subject to some degree of credit risk (the chance that the issuer of a security
will be unable to pay interest and principal in a timely manner). More detailed
information about risk -- including risks specific to each Portfolio -- is
provided beginning on page 8.


DIVIDENDS (page 13)

Dividends are declared daily and paid on the first business day of each month.
In participant accounts, all distributions are automatically reinvested.


INVESTMENT ADVISER (page 14)

Vanguard Fixed Income Group, Valley Forge, PA, manages each of the three
Portfolios.

AVERAGE ANNUAL TOTAL RETURNS --
PERIODS ENDED NOVEMBER 30, 1996
   
<TABLE>
<CAPTION>
                           1 Year   5 Years   10 Years
                          -----------------------------
<S>                         <C>       <C>       <C>
Treasury Money
  Market Portfolio*         5.1%      4.1%      5.6%

Lipper U.S. Treasury
  Money Market Average      4.8       3.9       5.4

Federal Portfolio           5.2%      4.3%      5.8%

Lipper U.S. Government
  Money Market Average      4.8       3.9       5.4

Prime Portfolio             5.3%      4.4%      6.0%

Lipper Non-Government
  Money Market Average      4.8       3.9       5.5
</TABLE>
    
- -------------------------------------------------------
*Formerly known as Vanguard Money Market
 Reserves - U.S. Treasury Portfolio.


In evaluating past performance, remember that it is not indicative of future
performance. Performance figures include the reinvestment of any dividends. The
returns shown are net of expenses, but they do not reflect income taxes an
investor would have incurred. An investment in a money market fund is neither
insured nor guaranteed by the U.S. government, and there is no assurance that
the fund will be able to maintain a stable net asset value of $1.00 per share.

                                       1
<PAGE>   34
PORTFOLIO PROFILE (continued)                     Vanguard Money Market Reserves
                                        Vanguard Treasury Money Market Portfolio
   
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------
                                      TREASURY
                                     MONEY MARKET*            FEDERAL               PRIME
- ---------------------------------------------------------------------------------------------------
<S>                                 <C>                   <C>                  <C>
INCEPTION DATE:                           12/2/96               7/13/81                6/4/75

NET ASSETS AS OF 11/30/96:          $2.92 billion         $3.10 billion        $22.22 billion

EXPENSE RATIO FOR THE YEAR
   ENDED 11/30/96:                           0.32%                 0.32%                 0.32%

NEWSPAPER ABBREVIATION:**                VangTrsy               VangFdl                VangPr

VANGUARD FUND NUMBER:                         050                   033                   030
    
- ---------------------------------------------------------------------------------------------------
</TABLE>

*  On 12/2/96, Vanguard Money Market Reserves - U.S. Treasury Portfolio was
   reorganized as a separate portfolio of Vanguard Treasury Fund and renamed the
   Treasury Money Market Portfolio.

** Money market portfolios are listed separately from the daily mutual fund
   listings.


                                        2
<PAGE>   35
PORTFOLIO EXPENSES

The examples below are designed to help you understand the various costs you
would bear, directly or indirectly, as an investor in one of the Portfolios.

  As noted in this table, you do not pay fees of any kind when you buy, sell, or
exchange shares of any Portfolio:

SHAREHOLDER TRANSACTION EXPENSES
<TABLE>
<S>                                                         <C>
Sales Load Imposed on Purchases:                            None
Sales Load Imposed on Reinvested Dividends:                 None
Redemption Fees:                                            None
Exchange Fees:                                              None
</TABLE>

   
 The next table illustrates the operating expenses that you would incur as a
shareholder of each Portfolio. These expenses are deducted from the Portfolio's
income before it is paid to you. Expenses include investment advisory fees as
well as the costs of maintaining accounts, administering the Portfolios,
providing shareholder services, and other activities. The expenses shown in the
table are based upon expenses incurred in the fiscal year ended November 30,
1996 (the expenses for the Treasury Money Market Portfolio are based upon those
of Vanguard Money Market Reserves-U.S. Treasury Portfolio for its fiscal year
ended November 30, 1996).
    



ANNUAL PORTFOLIO OPERATING EXPENSES
(AS A PERCENTAGE OF AVERAGE NET ASSETS)
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
                                  TREASURY MONEY      FEDERAL         PRIME
                                 MARKET PORTFOLIO    PORTFOLIO      PORTFOLIO
- --------------------------------------------------------------------------------
<S>                              <C>              <C>           <C>
Management and
   Administrative Expenses:               0.26%          0.26%          0.26%
Investment Advisory Expenses:             0.01%          0.01%          0.01%
12b-1 Marketing Fees:                     None           None           None
Other Expenses
   Marketing and Distribution
     Costs:                       0.03%            0.03%          0.03%
   Miscellaneous Expenses
     (e.g., Taxes, Auditing):     0.02%            0.02%          0.02%
Total Other Expenses:                     0.05%          0.05%          0.05%
TOTAL OPERATING EXPENSES
   (EXPENSE RATIO):                       0.32%          0.32%          0.32%
</TABLE>


                                PLAIN TALK ABOUT
                             THE COSTS OF INVESTING

Costs are an important consideration in choosing a mutual fund. That's because
you, as a shareholder, pay the costs of operating a fund, plus any transaction
costs associated with buying, selling, or exchanging shares. These costs can
erode a substantial portion of the gross income a fund achieves. Even seemingly
small differences in fund expenses can, over time, have a dramatic impact on a
fund's performance.



                                PLAIN TALK ABOUT
                                  FUND EXPENSES

   
All mutual funds have operating expenses. These expenses, which are deducted
from a fund's gross income, are expressed as a percentage of the average net
assets of the fund. For instance, the Prime Portfolio's expense ratio in fiscal
year 1996 was 0.32%, or $3.20 per $1,000 of average net assets. The average
money market fund had expenses in 1996 of 0.72%, or $7.20 per $1,000 of average
net assets, according to Lipper Analytical Services, Inc., which reports on the
mutual fund industry.
    

                                       3
<PAGE>   36
   The following example illustrates the hypothetical expenses that you would
incur on a $1,000 investment over various periods. The example assumes (1) that
the Portfolio provides a return of 5% a year and (2) that you redeem your
investment at the end of each period.

<TABLE>
<CAPTION>
PORTFOLIO                     1 YEAR   3 YEARS   5 YEARS    10 YEARS
- --------------------------------------------------------------------------------
<S>                             <C>      <C>       <C>        <C>
Treasury Money Market           $3       $10       $18        $41
Federal                         $3       $10       $18        $41
Prime                           $3       $10       $18        $41
- --------------------------------------------------------------------------------
</TABLE>

THIS EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF ACTUAL EXPENSES OR
PERFORMANCE FROM THE PAST OR FOR THE FUTURE, WHICH MAY BE HIGHER OR LOWER THAN
THOSE SHOWN.

                                       4
<PAGE>   37
FINANCIAL HIGHLIGHTS

   
The following financial highlights tables show the results for a share
outstanding for each of the last ten years ended November 30, 1996. The
financial highlights for the fiscal years ended November 30 were audited by
Price Waterhouse LLP, independent accountants. You should read this information
in conjunction with each Portfolio's financial statements and accompanying
notes, which appear in Vanguard Money Market Reserves' most recent Annual Report
(along with the audit report from Price Waterhouse). The Annual Report (which
includes information on the U.S. Treasury Portfolio) is incorporated by
reference in the Statement of Additional Information and in this prospectus, and
contains a more complete discussion of each Portfolio's performance. You may
have the Report sent to you without charge by writing to or calling Vanguard
(see back cover).
    

   
<TABLE>
<CAPTION>
                                 TREASURY MONEY MARKET PORTFOLIO*
- -----------------------------------------------------------------------------------------------------------------------
                                      YEAR ENDED NOVEMBER 30,
- -----------------------------------------------------------------------------------------------------------------------
                              1996       1995        1994        1993        1992        1991        1990        1989
- ------------------------------------------------------------------------------------------------------------------------
<S>                       <C>         <C>         <C>         <C>         <C>         <C>         <C>         <C>     
NET ASSET VALUE,
 BEGINNING OF PERIOD      $   1.00    $   1.00    $   1.00    $   1.00    $   1.00    $   1.00    $   1.00    $   1.00
- ------------------------------------------------------------------------------------------------------------------------
INVESTMENT OPERATIONS
 Net Investment Income        .050        .053        .036        .028        .036        .058        .077        .085
 Net Realized and
  Unrealized Gain (Loss)
  on Investments                --          --          --          --          --          --          --          --
- ------------------------------------------------------------------------------------------------------------------------
  TOTAL FROM INVESTMENT
   OPERATIONS                 .050        .053        .036        .028        .036        .058        .077        .085
- ------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
 Dividends from Net
  Investment Income          (.050)      (.053)      (.036)      (.028)      (.036)      (.058)      (.077)      (.085)
 Distributions from
  Realized Capital Gains        --          --          --          --          --          --          --          --
- ------------------------------------------------------------------------------------------------------------------------
  TOTAL DISTRIBUTIONS        (.050)      (.053)      (.036)      (.028)      (.036)      (.058)      (.077)      (.085)
- ------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE,
 END OF PERIOD            $   1.00    $   1.00    $   1.00    $   1.00    $   1.00    $   1.00    $   1.00    $   1.00
=========================================================================================================================
TOTAL RETURN                  5.11%       5.47%       3.63%       2.86%       3.68%       5.94%       8.02%       8.89%
=========================================================================================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
 Period (Millions)        $  2,917    $  2,527    $  2,056    $  1,751    $  2,321    $  2,092    $  1,594    $    412
Ratio of Expenses to
 Average Net Assets           0.32%       0.32%       0.32%       0.32%       0.30%       0.30%       0.30%       0.31%**
Ratio of Net Investment
 Income to Average
 Net Assets                   4.99%       5.33%       3.59%       2.83%       3.60%       5.76%       7.74%       8.44%
- ------------------------------------------------------------------------------------------------------------------------
</TABLE>
    
   
<TABLE>
<CAPTION>
                           YEAR ENDED NOVEMBER 30,
- ------------------------------------------------------
                            1988           1987
- ------------------------------------------------------
<S>                      <C>            <C>
NET ASSET VALUE,
 BEGINNING OF PERIOD     $   1.00       $   1.00
- ------------------------------------------------------
INVESTMENT OPERATIONS
 Net Investment Income       .068           .058
 Net Realized and
  Unrealized Gain (Loss)
  on Investments               --            --
- ------------------------------------------------------
  TOTAL FROM INVESTMENT
   OPERATIONS                .068           .058
- ------------------------------------------------------
DISTRIBUTIONS
 Dividends from Net
  Investment Income         (.068)         (.058)
 Distributions from
  Realized Capital Gains       --            --
  TOTAL DISTRIBUTIONS       (.068)         (.058)
- ------------------------------------------------------
NET ASSET VALUE,
 END OF PERIOD           $   1.00       $   1.00
======================================================
TOTAL RETURN                 7.02%          5.99%
======================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
 Period (Millions)       $    140       $   113
Ratio of Expenses to
 Average Net Assets          0.70%**       0.79%**
Ratio of Net Investment
 Income to Average
 Net Assets                  6.85%          5.80%
- ------------------------------------------------------
</TABLE>
    

*   Formerly known as Vanguard Money Market Reserves - U.S. Treasury Portfolio.
   
**  Insurance premiums represent 0.40%, 0.42%, and 0.44%.
    



  From time to time, the Vanguard funds advertise yield and total return 
figures. Yield is an historical measure of dividend income, and total return is
a measure of past dividend income (assuming that it has been reinvested) plus
any capital appreciation. Neither yield nor total return should be used to
predict the future performance of a fund.



                                PLAIN TALK ABOUT
                   HOW TO READ THE FINANCIAL HIGHLIGHTS TABLE

   
This explanation uses the Treasury Money Market Portfolio as an example. The
Treasury Money Market Portfolio (known as the U.S. Treasury Portfolio until
December 2, 1996) began fiscal 1996 with a net asset value (price) of $1.00 per
share. During the year, the Portfolio earned $.050 per share from investment
income (interest and dividends). All of these earnings were returned to
shareholders in the form of dividend distributions. The earnings ($.050 per
share) less distributions ($.050 per share) resulted in a share price of $1.00
at the end of the year. Assuming that the shareholder had reinvested the
distribution in the purchase of more shares, total return from the Portfolio was
5.11% for the year.

  As of November 30, 1996, the Portfolio had more than $2.91 billion in net
assets; an expense ratio of 0.32% ($3.20 per $1,000 of net assets); and net
investment income amounting to 4.99% of its average net assets.
    


                                       5
<PAGE>   38
   
<TABLE>
<CAPTION>
                                                          FEDERAL PORTFOLIO
- -----------------------------------------------------------------------------------------------------------------------------------
                                                       YEAR ENDED NOVEMBER 30,
- -----------------------------------------------------------------------------------------------------------------------------------
                            1996      1995       1994       1993       1992       1991       1990       1989       1988       1987
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                       <C>       <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
NET ASSET VALUE,
 BEGINNING OF PERIOD      $  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       .051      .056       .038       .029       .038       .060       .078       .088       .070       .061
 Net Realized and
  Unrealized Gain (Loss)
  on Investments             --        --         --         --         --         --         --         --         --         --
- -----------------------------------------------------------------------------------------------------------------------------------
  TOTAL FROM INVESTMENT
   OPERATIONS                .051      .056       .038       .029       .038       .060       .078       .088       .070       .061
- -----------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
 Dividends from Net
  Investment Income         (.051)    (.056)     (.038)     (.029)     (.038)     (.060)     (.078)     (.088)     (.070)     (.061)
 Distributions from
  Realized Capital Gains     --        --         --         --         --         --         --         --         --         --
- -----------------------------------------------------------------------------------------------------------------------------------
  TOTAL DISTRIBUTIONS       (.051)    (.056)     (.038)     (.029)     (.038)     (.060)     (.078)     (.088)     (.070)     (.061)
- -----------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE,
 END OF PERIOD            $  1.00   $  1.00    $  1.00    $  1.00    $  1.00    $  1.00    $  1.00    $  1.00    $  1.00    $  1.00
===================================================================================================================================
TOTAL RETURN                 5.26%     5.77%      3.82%      2.98%      3.83%      6.18%      8.14%      9.15%      7.20%      6.25%
===================================================================================================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
 Period (Millions)        $ 3,100   $ 2,637    $ 2,196    $ 1,907    $ 1,986    $ 2,000    $ 1,950    $ 1,531    $ 1,214    $   839
Ratio of Expenses to
 Average Net Assets          0.32%     0.32%      0.32%      0.32%      0.30%      0.30%      0.30%      0.28%      0.33%      0.37%
Ratio of Net Investment
 Income to Average
 Net Assets                  5.13%     5.61%      3.78%      2.94%      3.76%      6.01%      7.90%      8.78%      7.00%      6.10%
- -----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
    


   
<TABLE>
<CAPTION>
                                                          PRIME PORTFOLIO
- -----------------------------------------------------------------------------------------------------------------------------------
                                                      YEAR ENDED NOVEMBER 30,
- -----------------------------------------------------------------------------------------------------------------------------------
                            1996       1995       1994       1993       1992       1991       1990       1989       1988      1987
- -----------------------------------------------------------------------------------------------------------------------------------
<S>                       <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>       <C>
NET ASSET VALUE,
 BEGINNING OF PERIOD      $  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       .052       .057       .038       .030       .038       .062       .080       .090       .072      .063
 Net Realized and
  Unrealized Gain (Loss)
  on Investments             --         --         --         --         --         --         --         --         --        --
 ----------------------------------------------------------------------------------------------------------------------------------
  TOTAL FROM INVESTMENT
   OPERATIONS                .052       .057       .038       .030       .038       .062       .080       .090       .072      .063
 ----------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
 Dividends from Net
  Investment Income         (.052)     (.057)     (.038)     (.030)     (.038)     (.062)     (.080)     (.090)     (.072)    (.063)
 Distributions from
  Realized Capital Gains     --         --         --         --         --         --         --         --         --        --
 ----------------------------------------------------------------------------------------------------------------------------------
  TOTAL DISTRIBUTIONS       (.052)     (.057)     (.038)     (.030)     (.038)     (.062)     (.080)     (.090)     (.072)    (.063)
 ----------------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE,
 END OF PERIOD            $  1.00    $  1.00    $  1.00    $  1.00    $  1.00    $  1.00    $  1.00    $  1.00    $  1.00   $  1.00
===================================================================================================================================
TOTAL RETURN                 5.31%      5.82%      3.87%      3.02%      3.89%      6.39%      8.32%      9.40%      7.47%     6.49%
===================================================================================================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
 Period (Millions)        $22,218    $18,764    $15,109    $12,367    $12,638    $13,496    $13,579    $11,067    $ 6,863   $ 4,088
Ratio of Expenses to
 Average Net Assets          0.32%      0.32%      0.32%      0.32%      0.30%      0.30%      0.30%      0.28%      0.33%     0.37%
Ratio of Net Investment
 Income to Average
 Net Assets                  5.18%      5.64%      3.84%      2.98%      3.82%      6.20%      8.06%      9.05%      7.28%     6.30%
 ----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
    

                                       6
<PAGE>   39
A WORD ABOUT RISK

This prospectus describes the risks you will face as an investor in the Treasury
Money Market, Federal, and Prime Portfolios. It is important to keep in mind one
of the main axioms of investing: the higher the risk of losing money, the higher
the potential reward. The reverse, also, is generally true: the lower the risk,
the lower the potential reward. As you consider an investment in one or more of
the Portfolios, you should weigh your desire for income with your need to
protect your investment.

    Look for this "warning flag" symbol [BLACK FLAG] throughout the prospectus.
It is used to mark detailed information about each type of risk that you, as a
shareholder of any of the three Portfolios, may confront.



THE PORTFOLIOS' OBJECTIVES

Each Portfolio seeks to provide current income while maintaining liquidity and a
stable net asset value of $1.00 per share. These objectives are fundamental,
which means that they cannot be changed unless a majority of Portfolio
shareholders vote to do so.


WHO SHOULD INVEST

Any of the Portfolios may be a suitable investment for you if:

- -   You wish to add a money market portfolio to your existing holdings, which
    could include other cash -- as well as stock and bond -- investments.

- -   You want an investment that does not fluctuate in value.

- -   You want income.

- -   You characterize your investment temperament as "very conservative." 

    Each Portfolio is intended to serve most investors' short-term needs.
However, investors who engage in excessive in-and-out trading activity generate
additional costs that are borne by all of the Portfolio's shareholders. To
minimize such costs, which reduce the ultimate returns achieved by you and other
shareholders, the Portfolios have adopted the following policies:

- -   Each of the Portfolios reserves the right to reject any purchase request --
    including exchanges from other Vanguard Funds -- that it regards as
    disruptive to the efficient management of the Portfolio. This could be
    because of the timing of the investment or because of a history of excessive
    trading by the investor.

- -   The Portfolios reserve the right to stop offering shares at any time.

    If you own shares of one of the Portfolios as an investment option in an
employer-sponsored retirement or savings plan, your plan dictates the rules
governing exchanges. Contact your plan administrator for details.

                                       7
<PAGE>   40
                                PLAIN TALK ABOUT

                                  CASH RESERVES

Cash reserves are any investment that can be easily converted into cash with
little or no cost or penalty. A money market mutual fund, a checking account or
certificate of deposit (CD) at a bank, and Treasury bills issued by the U.S.
government are examples of cash reserves. Keep in mind, however, that each type
varies in its credit quality and its ability to provide a competitive yield.


INVESTMENT POLICIES

   
This section explains how the Portfolios' investment adviser pursues the
objectives of income, liquidity, and stability. It also explains several
important risks -- income risk, manager risk, and credit risk -- faced by
Portfolio shareholders. Unlike the Portfolios' objectives, the Portfolios'
policies are not fundamental and can be changed by the Portfolios' boards of
directors or trustees without shareholder approval. However, before making any
important change in its policies, the Portfolio will give shareholders 30-days
notice, in writing.
    

MARKET EXPOSURE

Each Portfolio invests in very high-quality money market instruments -- also
known as cash reserves -- that are considered short term (that is, they mature
in 13 months or less). Each Portfolio will maintain a dollar-weighted average
maturity of 90 days or less.

[BLACK FLAG] EACH PORTFOLIO IS SUBJECT TO INCOME RISK, WHICH IS THE POSSIBILITY
             THAT A PORTFOLIO'S DIVIDENDS (THAT IS, INCOME) WILL DECLINE BECAUSE
             OF FALLING INTEREST RATES. BECAUSE THE PORTFOLIOS' INCOME IS BASED
             ON SHORT-TERM INTEREST RATES -- WHICH CAN FLUCTUATE SIGNIFICANTLY
             OVER SHORT PERIODS -- INCOME RISK IS EXPECTED TO BE HIGH FOR ALL
             THREE PORTFOLIOS.
   

  To illustrate how the yields of short-term securities can fluctuate as 
interest rates rise and fall, the following chart shows month-end yields for
short-term securities (as represented by 90-day Treasury bills) and long-term
securities (as represented by 30-year U.S. Treasury bonds) over the past five
years.
    

   
                    SHORT-TERM AND LONG-TERM MONTH-END YIELDS
                                  (1992 - 1996)


                                  [LINE CHART]
    


These yields reflect past performance and should not be regarded as an
indication of future returns from either Treasury bills or bonds as a whole or
any of the Portfolios in particular.



                                       8
<PAGE>   41
SECURITY SELECTION

Vanguard Fixed Income Group, adviser to the Portfolios, selects high-quality
money market instruments. Each Portfolio focuses on securities of a particular
class of issuer (for example, the U.S. government, U.S. government agencies,
financial institutions).
                
[FLAG GRAPHIC] EACH PORTFOLIO IS SUBJECT TO MANAGER RISK, WHICH IS THE
               POSSIBILITY THAT VANGUARD FIXED INCOME GROUP MAY DO A POOR JOB OF
               SELECTING SECURITIES.

   The Treasury Money Market Portfolio invests solely in securities whose
interest and principal payments are backed by the full faith and credit of the
U.S. government. At least 65% of the Portfolio's assets will always be invested
in U.S. Treasury securities. The remainder of the Portfolio's assets may include
securities issued by the U.S. Treasury and other government agencies, such as
the Government National Mortgage Association (GNMA), the Small Business
Administration, and the Federal Financing Bank.

   The Federal Portfolio invests in securities whose interest and principal
payments are backed by the full faith and credit of the U.S. government or by an
agency of the government (these agency securities are not backed by the full
faith and credit of the U.S. government). These agencies include, among others,
the Federal Home Loan Bank, the Federal National Mortgage Association (FNMA),
the Tennessee Valley Authority, and the Federal Land Bank.

   
   The Prime Portfolio invests in certificates of deposit, bankers acceptances,
commercial paper, and other money market securities rated Prime-1 by Moody's
Investors Service, Inc., or A-1 by Standard & Poor's Corporation. Securities
that are unrated must be issued by a corporation with a debt rating of Aa3 or
better by Moody's or AA- or better by Standard & Poor's. The Prime Portfolio
also invests in short-term corporate, state, and municipal obligations rated Aa3
or better by Moody's or AA- or better by Standard & Poor's; and securities that
are considered suitable for the Federal Portfolio (see the previous paragraph).
    

   The Prime Portfolio may also invest in Eurodollar and Yankee obligations,
which are certificates of deposit issued in U.S. dollars by foreign banks and
foreign branches of U.S. banks. Eurodollar and Yankee obligations have the same
risks, such as income risk and credit risk, as U.S. money market instruments.
Other risks of Eurodollar and Yankee obligations include the possibility that a
foreign government will not let U.S. dollar-denominated assets leave the
country; the possibility that the banks that issue Eurodollar obligations may
not be subject to the same regulations as U.S. banks; and the possibility that
adverse political or economic developments will affect investments in a foreign
country. Before the Portfolio's adviser selects a Eurodollar or Yankee
obligation, however, any foreign issuer undergoes the same credit-quality
analysis and tests of financial strength as the issuers of domestic securities.


                                PLAIN TALK ABOUT

                            MONEY MARKET INSTRUMENTS

The term "money market instruments" refers to a variety of short-term
investments, usually with a maturity of 13 months or less. Some common types are
Treasury bills and notes, which are securities issued by the U.S. Government;
commercial paper, which is a promissory note issued by a large company or
financial firm; bankers acceptances, which are credit instruments guaranteed by
a bank; and negotiable certificates of deposit, which are issued by banks in
large denominations.


                                PLAIN TALK ABOUT

                           CREDIT QUALITY AND RATINGS

A money market instrument's credit quality depends upon the issuer's ability to
pay interest on the security and, ultimately, to repay the debt. The lower the
rating by one of the independent bond-rating agencies (for example, Moody's or
Standard & Poor's), the greater the chance (in the rating agency's opinion) the
security's issuer will default, or fail to meet its payment obligations. Direct
U.S. Treasury obligations (that is, securities backed by the U.S. government)
carry the highest credit ratings. All things being equal, money market
instruments with greater credit risk offer higher yields.

                                       9
<PAGE>   42
                                PLAIN TALK ABOUT

                              REPURCHASE AGREEMENTS

A means of investing money for a short period, repurchase agreements are
contracts in which a U.S. commercial bank or securities dealer sells government
securities and agrees to repurchase the securities on a specific date (normally
the next business day) and at a specific price. 


                                PLAIN TALK ABOUT

                                   DERIVATIVES

A derivative is a financial contract whose value, or interest rate, is based on
(or "derived" from) a traditional security (such as a stock or bond), money
market benchmark (such as U.S. Treasury bill rates or Federal Funds Effective
Rate), an asset (such as a commodity like gold), or a market index (such as the
S&P 500 Index).

   

   In addition, each Portfolio may invest up to 10% of its net assets in
restricted or illiquid securities that may not have price quotations immediately
available. Restricted or illiquid securities are not freely marketable or are
subject to legal restrictions on their sales.

    

[FLAG GRAPHIC] EACH PORTFOLIO IS SUBJECT, TO A LIMITED EXTENT, TO CREDIT RISK,
               WHICH IS THE POSSIBILITY THAT THE ISSUER OF A SECURITY WILL BE
               UNABLE TO REPAY INTEREST AND PRINCIPAL IN A TIMELY MANNER.

   The three Portfolios differ mainly in terms of credit risk. In absolute
terms, each Portfolio's credit quality is very high.

   In relative terms, the Treasury Money Market Portfolio, which invests in
securities backed by the full faith and credit of the U.S. government, offers
the lowest credit risk -- and generally the lowest yield -- of the three
Portfolios.

   Not all of the securities included in the Federal Portfolio are backed by the
full faith and credit of the U.S. government, and so the Portfolio's potential
credit risk and yield are somewhat higher than the Treasury Money Market
Portfolio.

   While the credit quality of its securities is very high, the Prime Portfolio
invests in money market securities of private financial and nonfinancial
corporations; therefore, it offers the highest credit risk and generally the
highest yield of the three Portfolios.

   Bear in mind that, while each Portfolio invests in high-quality money market
instruments, the three Portfolios are not insured or guaranteed by the FDIC or
any other agency of the U.S. government.

[FLAG GRAPHIC] THE PRIME AND FEDERAL PORTFOLIOS RESERVE THE RIGHT TO INVEST IN
               REPURCHASE AGREEMENTS, WHICH ARE SUBJECT TO SPECIFIC RISKS.

   

   Repurchase agreements carry several risks. For instance, if the seller is
unable to repurchase the securities as promised, the Portfolio may experience a
loss when trying to sell the securities to another person. Or, if the seller
becomes insolvent, a bankruptcy court may determine that the securities do not
belong to the Portfolio and order that the securities be sold to pay off the
seller's debts. The Portfolio's adviser believes that these risks can be
controlled through careful security selection and monitoring.

    

[FLAG GRAPHIC] THE PORTFOLIOS RESERVE THE RIGHT TO INVEST, TO A LIMITED EXTENT,
               IN FLOATING-RATE SECURITIES, WHICH ARE TRADITIONAL TYPES OF
               DERIVATIVES.

   A floating-rate security's interest rate, as the name implies, is not set;
instead, it fluctuates periodically. Generally, the security's yield is based on
a U.S. dollar-based interest-rate benchmark such as the Federal Funds Rate, the
90-day Treasury bill rate, or the London Interbank Offered Rate (LIBOR). These
securities reset their yields

                                       10
<PAGE>   43
on a periodic basis (for example, daily, weekly, or quarterly) and are closely
correlated to changes in money market interest rates.

   The Portfolios will not use derivatives for speculative purposes or as
leveraged investments that magnify the risks of an investment.


PORTFOLIO TURNOVER

Because of the short-term nature of money market instruments, the turnover rate
for each Portfolio is expected to be high. This high turnover rate should not
increase Portfolio costs, however, since brokerage commissions are not usually
charged for the purchase or sale of money market instruments.


INVESTMENT LIMITATIONS

To reduce risk and maintain diversification, the Portfolios have adopted limits
on some of their investment policies. Specifically, each Portfolio will not: 

- -   Invest more than 5% of its assets in the securities of any one issuer,
    excluding the U.S. government.

- -   Buy more than 10% of any class of securities of any issuer.

- -   Invest more than 25% of its assets in any one industry, excluding
    obligations of the U.S. government, certificates of deposit, and U.S.
    bankers acceptances.

- -   Borrow money from a bank, except for temporary or emergency purposes.
    Amounts borrowed will not exceed 15% of the Portfolio's net assets. When
    borrowing exceeds 5% of the Portfolio's total net assets, the Portfolio will
    not make additional investments. In borrowing, each Portfolio may be
    leveraged and may rise or fall in value more rapidly.

   

   The limitations listed in this prospectus and in the Statements of Additional
Information are fundamental and may be changed only by approval of a majority of
the Portfolios' shareholders.

    

INVESTMENT PERFORMANCE

The Portfolios invest in short-term securities; therefore, their performance is
closely correlated to short-term interest rates. Historically, short-term
interest rates' up-and-down fluctuations have been influenced primarily by
Federal Reserve policy and by market supply and demand.


                                PLAIN TALK ABOUT

                                PAST PERFORMANCE

Whenever you see information on a fund's performance, do not consider the
figures to be an indication of the performance you could expect by making an
investment in the fund today. The past is an imperfect guide to the future;
history does not repeat itself in neat, predictable patterns. 

                                       11
<PAGE>   44
                          AVERAGE ANNUAL TOTAL RETURNS
                           FOR PERIODS ENDED 11/30/96

   

<TABLE>
<CAPTION>
                                               1 YEAR    5 YEARS   10 YEARS
                                               ------    -------   --------
<S>                                              <C>       <C>       <C> 
TREASURY MONEY MARKET PORTFOLIO                  5.1%      4.1%      5.6%

LIPPER U.S. TREASURY MONEY MARKET AVERAGE        4.8%      3.9%      5.4%

FEDERAL PORTFOLIO                                5.2%      4.3%      5.8%

LIPPER U.S. GOVERNMENT MONEY MARKET AVERAGE      4.8%      3.9%      5.4%

PRIME PORTFOLIO                                  5.3%      4.4%      6.0%

LIPPER NON-GOVERNMENT MONEY MARKET AVERAGE       4.8%      3.9%      5.5%
</TABLE>

    

*Formerly known as Vanguard Money Market Reserves - U.S. Treasury Portfolio.


 The results shown above represent the Portfolios' "average annual total return"
performance, which assumes that any distributions of dividends were reinvested
for the indicated periods. Also included is comparative information on industry
money market averages. The chart does not make any allowance for federal, state,
or local income taxes that shareholders must pay on a current basis.

                                       12
<PAGE>   45
SHARE PRICE

Each Portfolio's share price, called its net asset value, is expected to remain
at a constant $1.00. Although the stable share price is not guaranteed, the
Portfolios are managed and securities are purchased to maintain that price.


DIVIDENDS AND TAXES

Each Portfolio's dividends accrue daily. On the first business day of every
month, the Portfolios distribute to shareholders virtually all of their income
from interest as dividend distributions.

    If you own shares of a Portfolio as an investment option in an
employer-sponsored retirement or savings plan, these dividends will be
reinvested in additional Portfolio shares and accumulate on a tax-deferred
basis. You will not owe taxes on these distributions until you begin
withdrawals. You should consult your plan administrator, your plan's Summary
Plan document, or your own tax adviser about the tax consequences of an
investment in a Portfolio or of any plan withdrawals.

    If your Portfolio investment is not part of an employer-sponsored plan, 
you can receive distributions in cash, or you may have them automatically 
reinvested in more shares of the Portfolio. Dividend distributions -- whether 
received in cash or reinvested in additional shares -- are subject to federal 
(and possibly state and local) income taxes, no matter how long you have held 
the shares in the Portfolio. In addition, if your investment is not part of an 
employer-sponsored plan, you may be eligible for other tax considerations:

- -   Depending on your state's tax rules, the portion of a Portfolio's dividends
    that comes from U.S. Treasury securities and other "direct" U.S. Treasury
    obligations may be exempt from state and local taxes. The Portfolios will
    notify you each year how much, if any, of your distribution may qualify for
    this exemption.

- -   As part of a Delaware business trust and a portfolio made up of direct U.S.
    government obligations, the Treasury Money Market Portfolio should be exempt
    from any intangibles taxes. The Portfolio will notify you each year how
    much, if any, of the Portfolio's assets qualify for this exemption.

    You should consult your own tax adviser about other tax consequences of an
investment in any of the Portfolios.


THE FUNDS AND VANGUARD
   

Vanguard Treasury Fund and Vanguard Money Market Reserves are members of The
Vanguard Group, a family of more than 30 investment companies with more than 90
distinct investment portfolios and total net assets of more than $250 billion.
All of the Vanguard funds share in the expenses associated with business
operations, such as personnel, office space, equipment, and advertising.
    

                                PLAIN TALK ABOUT

                      VANGUARD'S UNIQUE CORPORATE STRUCTURE

The Vanguard Group, Inc. is the only MUTUAL mutual fund company. It is owned
jointly by the funds it oversees and by the shareholders in those funds. Other
mutual funds are operated by for-profit management companies that may be owned
by one person, by a group of individuals, or by investors who bought the
management company's publicly traded stock. Because of its structure, Vanguard
operates its funds at cost. Instead of distributing profits from operations to a
separate management company, Vanguard returns profits to fund shareholders in
the form of lower operating expenses.

                                       13
<PAGE>   46
                                PLAIN TALK ABOUT

                             THE PORTFOLIOS' ADVISER

Vanguard Fixed Income Group provides investment advisory services to some 40
Vanguard Portfolios; as of November 30, 1996, the Group managed some $78 billion
in assets.

   The managers responsible for the Portfolios' investments are:

   
   IAN A. MACKINNON, Senior Vice President of Vanguard; 23 years fixed-income
investment experience, 17 years primary responsibility for Vanguard's internal
fixed-income policy and strategy; B.A. from Lafayette College, M.B.A. from
Pennsylvania State University.
    

   
   ROBERT F. AUWAERTER, Principal of Vanguard and Portfolio Manager; 19 years
fixed-income investment experience; B.S., the University of Pennsylvania,
M.B.A., Northwestern University.
    

   
   JOHN HOLLYER, Principal of Vanguard and Portfolio Manager; 10 years
fixed-income investment experience; B.S. from the University of Pennsylvania.
    

   Mr. Auwaerter and Mr. Hollyer manage the Portfolios on a day-to-day basis.
Mr. MacKinnon is responsible for setting the Portfolios' broad investment
policies and for overseeing the Portfolio managers.


   Vanguard also provides marketing services to the funds. Although shareholders
do not pay sales commissions or 12b-1 marketing fees, each fund pays its
allocated share of The Vanguard Group's costs.

   A list of each Fund's directors (or trustees) and Officers, and their present
positions and principal occupations during the past five years, can be found in
each Fund's Statement of Additional Information.


INVESTMENT ADVISER

   
Vanguard Fixed Income Group, P.O. Box 2600, Valley Forge, PA 19482, provides
advisory services on an at-cost basis to the Treasury Money Market, Federal, and
Prime Portfolios. For the year ended November 30, 1996, the three Portfolios
paid a total of $3,238,000 in investment advisory expenses ($338,000 for the
U.S. Treasury Portfolio, $343,000 for the Federal Portfolio, and $2,557,000 for
the Prime Portfolio).
    

   The Group places all orders for purchases and sales for Portfolio securities,
and is directed to get the best available price and most favorable execution
with respect to all transactions.


GENERAL INFORMATION

Vanguard Money Market Reserves, Inc. is organized as a corporation under the
laws of the State of Maryland. Until December 2, 1996, the Treasury Money Market
Portfolio was a Portfolio of Vanguard Money Market Reserves, known as the U.S.
Treasury Portfolio. On that date, the Treasury Money Market Portfolio was
reorganized -- through a transfer of assets into a Portfolio of Vanguard
Treasury Fund, a Delaware business trust.

   Shareholders of the Funds have rights and privileges similar to those enjoyed
by other corporate shareholders. For example, shareholders will not be
responsible for any liabilities of the trust or corporation. If any matters are
to be voted on by shareholders (such as a change in a fundamental investment
objective or the election of directors or trustees), each share outstanding at
that point would be entitled to one vote.

   
   The Prime Portfolio features two separate classes of shares. For personal
investments of $10 million or more, the Portfolio offers Prime Portfolio
Institutional Shares; for personal investments of lesser amounts the Portfolio
offers Prime Portfolio Shares, which is the share class described in this
prospectus. Prime Portfolio Institutional Shares and Prime Portfolio Shares do
not have the same expenses; as a result the performance of these separate share
classes could differ.
    


                                       14
<PAGE>   47
INVESTING WITH VANGUARD

FOR PLAN PARTICIPANTS

One or more of the three Portfolios described in this prospectus is an
investment option in your retirement or savings plan. Your plan administrator or
your employee benefits office can provide you with detailed information on how
to participate in your plan and how to elect a Portfolio as an investment
option.

- -   If you have any questions about a Portfolio or Vanguard, including the
    Portfolio's investment objective, strategies, or risks, contact Vanguard's
    Participant Services Department, toll-free, at 1-800-523-1188.

- -   If you have questions about your account, contact your plan administrator or
    the organization that provides recordkeeping services for your plan.


INVESTMENT OPTIONS AND ALLOCATIONS

Your plan's specific provisions may allow you to change your investment
selections, the amount of your contributions, or how your contributions are
allocated among the investment choices available to you. Contact your plan
administrator or employee benefits office for more details.


TRANSACTIONS

Contributions, exchanges, or redemptions of a Portfolio's shares are processed
as soon as they have been received by Vanguard in good order. Good order means
that your request includes complete information on your contribution, exchange,
or redemption, and that Vanguard has received the appropriate assets.


EXCHANGES

The exchange privilege (your ability to redeem shares from one fund to purchase
shares of another fund) may be available to you through your plan. However,
because excessive exchanges can potentially disrupt the management of a
Portfolio and increase its transaction costs, Vanguard reserves the right to
refuse any exchange request. In addition, certain investment options,
particularly funds made up of company stock or investment contracts, may be
subject to unique restrictions. Contact your plan administrator for details on
the exchange policies that apply to your plan.

    Before making an exchange, you should consider the following: 

- -   Before you exchange to another Vanguard fund available in your plan, you
    should read that fund's prospectus. Contact Participant Services, toll-free,
    at 1-800-523-1188 for a copy.

- -   Vanguard can accept exchanges only as permitted by your plan. Your plan
    administrator can explain how frequently exchanges are allowed.

FOR OTHER INSTITUTIONAL INVESTORS

If you have questions about the Treasury Money Market, Federal, or Prime
Portfolios, including how to establish an account, call Vanguard, toll-free, at
1-800-523-1036.

    If you have questions about an existing account, contact your Vanguard
account administrator.


TRANSACTIONS

Purchases, exchanges, or redemptions of a Portfolio's shares are processed as
soon as they have been received by Vanguard in good order. Good order means that
your request

                                       15
<PAGE>   48
includes complete information on your purchase, exchange, or redemption, and
that Vanguard has received the appropriate assets.

   Vanguard must consider the interests of all Portfolio shareholders and so
reserves the right to . . .

- -   Delay or reject any purchase or exchange request that may disrupt the
    Portfolio's operation or performance.

- -   Revise or terminate the exchange privilege or limit the amount of an
    exchange, at any time, without notice.

- -   Take up to seven days to deliver your redemption proceeds.


ACCESSING FUND INFORMATION BY COMPUTER

Vanguard on the
World Wide Web
http://www.vanguard.com

Use your personal computer to visit Vanguard's education-oriented website,
which provides timely news and information about Vanguard funds and services,
an on-line "university" that offers a variety of mutual fund classes; and
easy-to-use, interactive tools to help you create your own investment and
retirement strategies.


VANGUARD ONLINE(sm)
KEYWORD: Vanguard

Use your personal computer to learn more about Vanguard funds and services; map
out a long-term investment strategy; and ask questions, make suggestions, and
send messages to Vanguard. Vanguard Online is offered through America Online(R)
(AOL). To establish an AOL account, call 1-800-238-6336.
   
    

                                       16

<PAGE>   49
GLOSSARY OF INVESTMENT TERMS


CASH RESERVES

   
Cash deposits as well as short-term bank deposits, money market instruments,
bank CDs, repurchase agreements, and U.S. Treasury bills.
    


DIVERSIFICATION

Spreading your investments among many issuers (that is, organizations that sell
securities).


DIVIDEND INCOME

Payment to shareholders of income from interest or dividends generated by the
fund's investments.


EXPENSE RATIO

The percentage of a fund's average net assets used to pay its expenses. The
expense ratio includes management fees, administrative fees, and any 12b-1
marketing fees.


FIXED INCOME SECURITIES

Investments, such as bonds, that have a fixed payment schedule. While the level
of income offered by these securities is predetermined, their prices may
fluctuate.


INVESTMENT ADVISER

An organization that makes the day-to-day decisions regarding a portfolio's
investments.


LIQUIDITY

The degree of a security's marketability (that is, how quickly the security can
be sold at a fair price and converted to cash).


MONEY MARKET FUND

A mutual fund that seeks to provide income, liquidity, and a stable share price
by investing in very short-term, liquid investments.


MUTUAL FUND

An investment company that pools the money of many people and invests it in a
variety of securities in an effort to achieve a specific objective over time.


NET ASSET VALUE (NAV)

The market value of a mutual fund's total assets, minus liabilities, divided by
the number of shares outstanding. The value of a single share is called its
share value or share price. 


PORTFOLIO DIVERSIFICATION 

Holding a variety of securities so that a portfolio's return is not hurt by 
the poor performance of a single security.


PRINCIPAL

The amount of your own money you put into an investment.


SECURITIES

Stocks, bonds, money market instruments, and other investment vehicles.


TOTAL RETURN

A percentage change, over a specified time period, in a mutual fund's net asset
value, with the ending net asset value adjusted to account for the reinvestment
of all distributions of dividends and capital gains.


VOLATILITY

The fluctuations in value of a mutual fund or other security. The greater a
fund's volatility, the wider the fluctuations between its high and low prices.


YIELD

Current income (interest or dividends) earned by an investment, expressed as a
percentage of the investment's price. 

<PAGE>   50
[LOGO]

THE VANGUARD GROUP

Institutional Division
Post Office Box 2900
Valley Forge, PA 19482


FOR PARTICIPANTS IN EMPLOYER-SPONSORED PLANS

PARTICIPANT SERVICES DEPARTMENT

1-800-523-1188

Text Telephone:
1-800-523-8004

For information on the Vanguard Funds in your plan, Monday through Friday 8:30
a.m. to 7:00 p.m., Eastern time


FOR OTHER INSTITUTIONAL INVESTORS
1-800-523-1036

For information on Vanguard Funds and services



ELECTRONIC ACCESS TO THE VANGUARD MUTUAL FUND EDUCATION AND INFORMATION CENTER

World Wide Web
http://www.vanguard.com

E-mail
[email protected]


   
(C) 1997 Vanguard Marketing Corporation, Distributor
    

<PAGE>   51
 
                                     PART B
 
                             VANGUARD TREASURY FUND
 
                      STATEMENT OF ADDITIONAL INFORMATION
 
   
                                 MARCH 26, 1997
    
 
   
     This Statement is not a prospectus but should be read in conjunction with
the Fund's current Prospectus (dated March 26, 1997). To obtain the Prospectus
please call the Investor Information Department:
    
 
                                 1-800-662-7447
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                            PAGE
                                                                                            ----
<S>                                                                                         <C>
The Fund..................................................................................     1
Investment Objectives and Policies........................................................     1
Investment Limitations....................................................................     2
Yield and Total Return....................................................................     4
Calculation of Yield......................................................................     4
Purchase of Shares........................................................................     5
Redemption of Shares......................................................................     5
Shareholder Services......................................................................     5
Comparative Indexes.......................................................................     6
Management of the Fund....................................................................     9
Description of Shares and Voting Rights...................................................    12
Financial Statements......................................................................    12
Appendix--Description of Securities and Ratings...........................................    12
</TABLE>
 
                                    THE FUND
 
   
     Vanguard Treasury Fund (the "Fund") is an open-end, diversified, management
investment company whose shares are currently offered in one distinct Portfolio.
    
 
                       INVESTMENT OBJECTIVE AND POLICIES
 
     The following policies supplement the investment objective and policies set
forth in the Fund's Prospectus:
 
     RESTRICTED SECURITIES  The Portfolio may invest in restricted securities
(privately placed debt securities) and other securities which are not readily
marketable, but will not acquire such securities if as a result they, together
with the aggregate of other securities for which no quotations are readily
available, would comprise more than 10% of the value of the Portfolio's net
assets. Pursuant to Section 4(2) of the Securities Act of 1933 and Rule 144A
under the Securities Act of 1933, as amended, if a substantial market among
qualified institutional buyers develops for restricted securities held by any
Portfolio, the Fund intends to treat such securities as liquid securities, in
accordance with procedures approved by the Fund's Board of Trustees.
 
     Restricted securities may be sold only in privately negotiated transactions
or in a public offering with respect to which a registration statement is in
effect under the Securities Act of 1933. Where registration is required, a
Portfolio may be obligated to pay all or part of the registration expenses and a
considerable period may elapse between the time of the decision to sell and the
time the Portfolio may be permitted to sell a security under an effective
registration statement. If, during such a period, adverse market conditions were
to develop, the Portfolio might obtain a less favorable price than prevailed
when it decided to sell. Restricted securities will be priced at fair value as
determined in good faith by the Board of Trustees. If through the appreciation
of restricted securities or the depreciation of unrestricted securities, a
Portfolio should be in a
 
                                        1
<PAGE>   52
 
   
position where more than 10% of the value of its net assets are invested in
restricted or illiquid assets, including restricted securities, the Portfolio
will take appropriate steps to protect liquidity.
    
 
     ILLIQUID SECURITIES  Illiquid securities are securities that may not be
sold or disposed of in the ordinary course of business within seven business
days at approximately the value at which they are being carried on a Fund's
books. An illiquid security includes repurchase agreements which have a maturity
of longer than seven days, securities which are illiquid by virtue of the
absence of a readily available market, and demand instruments with a demand
notice exceeding seven days. Illiquid securities may include securities that are
not registered under the Securities Act of 1933 (the "1933 Act"); however,
unregistered securities that can be sold to "qualified institutional buyers" in
accordance with Rule 144A under the 1933 Act will not be considered illiquid so
long as it is determined by the Fund's adviser that an adequate trading market
exists for the security. From time to time, the Fund's Board of Trustees may
determine that certain restricted securities known as Rule 144A securities are
liquid and not subject to the 10% limitation described above.
 
     SECURITIES OF OTHER INVESTMENT COMPANIES  The Portfolio may invest in
securities of other investment companies if the securities are acquired as part
of a merger, consolidation of acquisition of assets approved by the Portfolio's
shareholders or otherwise to the extent permitted by Section 12 of the
Investment Company Act of 1940. The Portfolio will invest only in investment
companies which have investment objectives and policies consistent with those of
the Portfolio. When investing in the securities of other investment companies,
the Portfolio may incur fees and expenses of the underlying fund in addition to
the Portfolio's own fees and expenses.
 
                             INVESTMENT LIMITATIONS
 
   
     The following policies supplement the investment limitations set forth in
the Prospectus. It is a fundamental policy of the Portfolio not to engage in any
of the following activities or business practices. These restrictions may not be
changed with respect to the Portfolio without the approval of a majority of the
Portfolio's outstanding shares (as defined in the Investment Company Act of
1940). The Portfolio may not:
    
 
      1) purchase securities other than the securities in which the Portfolio is
         authorized to invest as set forth in the Prospectus;
 
      2) borrow money in excess of 15% of the total assets of the Portfolio
         taken at market value and then only from banks as a temporary measure
         for extraordinary or emergency purposes; provided, the Portfolio may
         borrow from any existing and future investment company member of The
         Vanguard Group of Investment Companies, or its predecessors, through
         its interfund lending facility; the Portfolio will not borrow to
         increase income (leveraging) but only to facilitate redemption requests
         which might otherwise require untimely dispositions of portfolio
         securities; the Portfolio 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 Portfolio is authorized to invest); provided, the Portfolio
         may make loans to any existing and future investment company member of
         The Vanguard Group or its predecessors, through its interfund lending
         facility; and provided further, that the Portfolio will not enter into
         repurchase agreements if, as a result thereof, more than 10% of the net
         assets of the 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 the Portfolio's total assets (taken at current value) would
         be invested in the securities of such issuer, or (b) the 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);
 
                                        2
<PAGE>   53
 
      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;
 
      6) purchase securities on margin or sell any securities short;
 
      7) purchase any securities which could cause more than 25% of the value of
         the 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;
 
      8) 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 the Portfolio's total assets but only
         to secure borrowings for temporary or emergency purposes;
 
      9) 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;
 
     10) 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;
 
     11) purchase or sell real estate, real estate investment trust securities,
         commodities, or commodity contracts;
 
     12) invest in companies for the purpose of exercising control;
 
     13) invest in securities of other investment companies, except as may be
         acquired as a part of a merger, consolidation or acquisition of assets
         approved by the Portfolio's shareholders or otherwise to the extent
         permitted by Section 12 of the Investment Company Act of 1940. The
         Portfolio will invest only in investment companies which have
         investment objectives and investment policies consistent with those of
         the Portfolio;
 
     14) issue senior securities.
 
     Notwithstanding these limitations, the Portfolio 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 Portfolio, the Portfolio will not in the
aggregate, enter into repurchase agreements maturing in more than seven days, or
invest in any other illiquid securities if, as a result thereof, more than 10%
of the net assets of the Portfolio would be invested in such assets.
    
 
   
     The above-mentioned investment limitations are considered at the time
investment securities are purchased.
    
 
                                        3
<PAGE>   54
 
                             YIELD AND TOTAL RETURN
 
   
     The yield of the Portfolio for the 7-day period ended November 30, 1996 is
set forth below. Yields are calculated daily for the Portfolio.
    
 
   
<TABLE>
    <S>                                                                                 <C>
    Treasury Money Market Portfolio*.................................................   5.03%
</TABLE>
    
 
   
     The average annual total return of the Portfolio for the one-, five- and
ten-year periods ending November 30, 1996 is set forth below:
    
 
   
<TABLE>
<CAPTION>
                               1 YEAR ENDED     3 YEARS ENDED     5 YEARS ENDED     10 YEARS ENDED
                                 11/30/96         11/30/96          11/30/96           11/30/96
                               ------------     -------------     -------------     --------------
    <S>                        <C>              <C>               <C>               <C>
    Treasury Money Market
      Portfolio*.............       5.1%              4.7%              4.1%              5.6%
</TABLE>
    
 
- ---------------
*Formerly the U.S. Treasury Portfolio of Vanguard Money Market Reserves, Inc.
 
     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 the Portfolio 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 the Portfolio for the 7-day base
period ended November 30, 1996.
    
 
   
<TABLE>
<CAPTION>
                                                                                      TREASURY MONEY
                                                                                     MARKET PORTFOLIO
                                                                                     ----------------
                                                                                         11/30/96
                                                                                     ----------------
<S>                                                                                  <C>
Value of account at beginning of period...........................................       $1.00000
Value of same account at end of period*...........................................        1.00096
                                                                                     ----------------
Net Change in account value.......................................................       $ .00096
Annualized Current Net Yield (Net
  Change X 365/7) average net asset value.........................................           5.03
Effective Yield [(Net Change)+1]365/7-1...........................................           5.13
Average Weighted Maturity of Investments..........................................        53 Days
</TABLE>
    
 
- ---------------
*Exclusive of any capital changes.
 
     The net asset value of a share of the Portfolio is $1.00 and it is not
expected to fluctuate. However, the yield of the 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 Portfolio 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.
 
                                        4
<PAGE>   55
 
                               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 (iii) to
reduce or waive the minimum investment for or any other restrictions on 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 the 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 the 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 will make 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 Trustees may deem advisable; however, payment will be made wholly
in cash unless the Trustees 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 the 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  The Portfolio's shares may be exchanged without cost
for 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 the Portfolio. 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 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 Trustees 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.
 
                                        5
<PAGE>   56
 
     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 the
Portfolio 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 quarterly 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.
 
                              COMPARATIVE INDEXES
 
     Vanguard may use reprinted material discussing the Vanguard Group, Inc. or
any of the member funds of the Vanguard Group of Investment Companies.
 
     Vanguard Treasury Fund 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 INDEX -- consists of more than 7,000 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 -- composed of the 2,000 smallest stocks contained in
the Russell 3000, representing approximately 7% of the Russell 3000 total market
capitalization.
 
RUSSELL 2000(R) VALUE INDEX -- contains stocks from the Russell 2000 Index with
a less-than-average growth orientation.
 
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, Australasia and the Far East.
 
GOLDMAN SACHS 100 CONVERTIBLE BOND INDEX -- currently includes 71 bonds and 29
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.
 
                                        6
<PAGE>   57
 
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.
 
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.
 
LEHMAN BROTHERS LONG-TERM CORPORATE BOND INDEX -- is a subset of the Lehman
Corporate Bond Index covering all corporate, publicly issued, fixed-rate,
nonconvertible U.S. debt issues rated at least Baa, with at least $50 million
principal outstanding and maturity greater than 10 years.
 
   
BOND BUYER MUNICIPAL BOND INDEX -- 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 -- 65% Standard & Poor's 500 Index and 35% Lehman Long-Term
Corporate AA or Better Bond Index.
 
COMPOSITE INDEX -- 65% Lehman Long-Term Corporate AA or Better Bond Index and a
35% weighting in a blended equity composite (75% Standard & Poor's/BARRA Value
Index and 25% Standard & Poor's Utilities Index).
 
LEHMAN LONG-TERM CORPORATE AA OR BETTER BOND INDEX -- consists of all publicly
issued, fixed rate, nonconvertible investment grade, dollar-denominated,
SEC-registered corporate debt rated AA or AAA.
 
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 Baa- 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.
 
                                        7
<PAGE>   58
 
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.
 
LIPPER GENERAL EQUITY FUND AVERAGE -- an industry benchmark of average general
equity funds with similar investment objectives and policies, as measured by
Lipper Analytical Services, Inc.
 
LIPPER FIXED INCOME FUND AVERAGE -- an industry benchmark of average fixed
income funds with similar investment objectives and policies, as measured by
Lipper Analytical Services, Inc.
 
                                        8
<PAGE>   59
 
                             MANAGEMENT OF THE FUND
 
OFFICERS AND TRUSTEES
 
     The Fund's Officers, under the supervision of the Board of Trustees, manage
the day-to-day operations of the Fund. The Trustees, who are elected annually by
shareholders, set broad policies for the Fund. A list of the Trustees 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 Trustees and Officers of the Fund is Post Office Box 876, Valley
Forge, PA 19482.
 
JOHN C. BOGLE, Chairman and Trustee*
     Chairman and Director of The Vanguard Group, Inc., and of each of the
     investment companies in The Vanguard Group. Director of The Mead
     Corporation, General Accident Insurance and Chris-Craft Industries, Inc.
 
JOHN J. BRENNAN, President, Chief Executive Officer & Trustee*
     President, Chief Executive Officer and Director of The Vanguard Group, Inc.
     and each of the investment companies in The Vanguard Group.
 
ROBERT E. CAWTHORN, Trustee
     Chairman Emeritus and Director of Rhone-Poulenc Rorer, Inc.; Director of
     Sun Company, Inc.; Director of Westinghouse Electric Corporation.
 
BARBARA BARNES HAUPTFUHRER, Trustee
     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, Trustee
     President Emeritus of The Brookings Institution; Director of American
     Express Bank, Ltd., The St. Paul Companies, Inc., and National Steel
     Corporation.
 
BURTON G. MALKIEL, Trustee
     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., Trustee
     Chairman, President, and Chief Executive Officer of NACCO Industries, Inc.;
     Director of The BFGoodrich Company and The Standard Products Company.
 
JOHN C. SAWHILL, Trustee
   
     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, Procter & Gamble
     Company and NACCO Industries.
    
 
JAMES O. WELCH, JR., Trustee
     Retired Chairman of Nabisco Brands Inc., retired Vice Chairman and Director
     of RJR Nabisco; Director of TECO Energy, Inc. and Director of Kmart
     Corporation.
 
J. LAWRENCE WILSON, Trustee
     Chairman and Chief Executive Officer, Rohm & Haas Company; Director of
     Cummins Engine Company and Trustee of Vanderbilt University.
 
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*
     Principal 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.
 
                                        9
<PAGE>   60
 
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 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.
 
     Vanguard 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.
 
   
     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 has 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, 1996, Vanguard
Treasury Money Market Portfolio (then known as U.S. Treasury Portfolio, a series
of Vanguard Money Market Reserves, Inc.), had contributed capital of $268,000 to
Vanguard, representing 1.34% of Vanguard's capitalization. The Funds' Service
Agreement provides 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, 1996, the Portfolio's share of Vanguard's actual
net costs of operation relating to management and administrative services
(including transfer agency) totaled approximately $4,181,000.
    
 
     DISTRIBUTION  Vanguard provides all distribution and marketing activities
for the Funds in the Group. Vanguard Marketing Corporation, a wholly-owned
subsidiary of Vanguard, 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
 
                                       10
<PAGE>   61
 
   
assets. During the fiscal year ended November 30, 1996, the Portfolio paid
approximately $819,000 of the Group's distribution and marketing expenses or .03
of 1% of the Portfolio's average month-end net assets.
    
 
   
     INVESTMENT ADVISORY SERVICES  Vanguard also provides the Fund, Vanguard
Money Market Reserves, Vanguard Municipal Bond Fund, Vanguard Bond Index Fund,
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, Reit Index Portfolio of Vanguard Specialized Portfolios,
several Portfolios of Vanguard Variable Insurance Fund, Vanguard International
Equity Index Fund, Aggressive Growth Portfolio of Vanguard Horizon Fund, Total
International Portfolio of Vanguard STAR 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, 1994, 1995, and 1996 the
Portfolio paid approximately $212,000, $297,000 and $338,000, respectively, of
Vanguard's expenses relating to investment advisory services.
    
 
     REMUNERATION OF TRUSTEES  The Fund pays each 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.
 
     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.
 
     TRUSTEES' RETIREMENT FEES  A Retirement Plan for Trustees has been
implemented to provide a fee to retired Trustees equal to $1,000 per year of
service on the Board, up to 15 years of service. This fee will remain in place
subsequent to the Trustee's retirement for a period of 10 years or until a
retired Trustee's death.
 
                            VANGUARD TREASURY FUND*
                               COMPENSATION TABLE
 
   
<TABLE>
<CAPTION>
                                AGGREGATE       PENSION OR RETIREMENT        ESTIMATED          TOTAL COMPENSATION
                               COMPENSATION      BENEFITS ACCRUED AS      ANNUAL BENEFITS     FROM ALL VANGUARD FUNDS
     NAMES OF TRUSTEES          FROM FUND       PART OF FUND EXPENSES     UPON RETIREMENT       PAID TO TRUSTEES(2)
- ---------------------------    ------------     ---------------------     ---------------     -----------------------
<S>                            <C>              <C>                       <C>                 <C>
John C. Bogle(1)                  $   --                $  --                      --                      --
John J. Brennan(1)                $   --                $  --                      --                      --
Barbara Barnes Hauptfuhrer        $  955                $ 148                 $15,000                 $65,000
Robert E. Cawthorn                $  955                $ 124                 $13,000                 $65,000
Bruce K. MacLaury                 $1,036                $ 145                 $12,000                 $60,000
Burton G. Malkiel                 $  955                $  99                 $15,000                 $65,000
Alfred M. Rankin, Jr.             $  955                $  78                 $15,000                 $65,000
John C. Sawhill                   $  955                $  93                 $15,000                 $65,000
James O. Welch, Jr.               $  955                $ 114                 $15,000                 $65,000
J. Lawrence Wilson                $  955                $  82                 $15,000                 $65,000
</TABLE>
    
 
   
(1) As "Interested Trustees," Messrs. Bogle and Brennan receive no compensation
    for their service as Trustees.
    
   
(2) The amounts reported in this column reflect the total compensation paid to
    each Trustee for their service as Director or Trustee of 34 Vanguard Funds
    (33 in the case of Mr. Malkiel; 27 in the case of Mr. MacLaury).
    
* Formerly the U.S. Treasury Portfolio of Vanguard Money Market Reserves.
 
                                       11
<PAGE>   62
 
                    DESCRIPTION OF SHARES AND VOTING RIGHTS
 
     The Declaration of Trust permits the Trustees to issue an unlimited number
of shares of beneficial interest with a par value of $.001. The Board of
Trustees has the power to designate one or more classes ("Portfolios") of shares
of beneficial interest. Currently the Fund is offering shares of one Portfolio.
 
     The shares of the Portfolio are fully paid and nonassessable, and have no
preference as to conversion, exchange, dividends, retirement or other features.
The shares of the Portfolio have no pre-emptive rights. The shares of the
Portfolio have non-cumulative voting rights, which means that the holders of
more than 50% of the shares voting for the election of Trustees can elect 100%
of the Trustees 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 Portfolio or class, shall be voted in the
aggregate and not by Portfolio or class: except (i) when required by the
Investment Company Act of 1940, shares shall be voted by individual Portfolio or
class; and (ii) when the matter does not affect any interest of a particular
Portfolio or class, then only shareholders of the affected class or classes
shall be entitled to vote thereon.
 
                              FINANCIAL STATEMENTS
 
   
     The Vanguard Treasury Money Market Portfolio's (formerly the U.S. Treasury
Portfolio of Vanguard Money Market Reserves) financial statements for the year
ended November 30, 1996, including the financial highlights for each of the five
fiscal years in the period ended November 30, 1996, appearing in the Vanguard
Money Market Reserves 1996 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
Vanguard Money Market Reserves 1996 Annual Report to Shareholders is enclosed
with this Statement of Additional Information.
    
 
   
               APPENDIX -- DESCRIPTION OF SECURITIES AND RATINGS
    
 
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.
 
                                       12
<PAGE>   63
 
                                     PART C
                             VANGUARD TREASURY FUND
                               OTHER INFORMATION
 
ITEM 24. FINANCIAL STATEMENTS AND EXHIBITS
     (A) FINANCIAL STATEMENTS
 
   
     The Registrant's audited financial statements for the year ended November
30, 1996, including Price Waterhouse LLP's report thereon, are incorporated by
reference, in the Statement of Additional Information, from the Registrant's
1996 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, 1996.
    
   
      2. Statement of Operations for the year ended November 30, 1996.
    
   
      3. Statement of Changes in Net Assets for each of the two years in the
         period ended November 30, 1996.
    
   
      4. Financial Highlights for each of the five years in the period ended
         November 30, 1996.
    
   
      5. Notes to Financial Statements at November 30, 1996.
    
   
      6. Report of Independent Accountants.
    
 
     (B) EXHIBITS
 
   
     1a. Certificate of Trust
    
   
     1b. Certificate of Amendment
    
   
      1. Agreement and Declaration of Trust
    
   
      2. By-Laws of Registrant
    
      3. Not Applicable
      4. Reference is made to Articles III and VII of the Agreement and
         Declaration of Trust dated August 19, 1996 of the Registrant filed
         herewith.
      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.
<PAGE>   64
 
ITEM 26. NUMBER OF HOLDERS OF SECURITIES
 
   
     As of November 30, 1996, there were 111,356 shareholders of the U.S.
Treasury Portfolio of Vanguard Money Market Reserves. On December 2, 1996, this
portfolio was reorganized as a separate portfolio of Vanguard Treasury Fund and
renamed the Treasury Money Market Portfolio.
    
 
ITEM 27. INDEMNIFICATION
 
     Reference is made to Article VII of Registrant's Declaration of Trust.
 
     Insofar as indemnification for liability arising under the Securities Act
of 1933 may be permitted to trustees, directors, officers and controlling
persons of the registrant pursuant to the foregoing provisions, or otherwise,
the registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a trustee, officer or controlling
person of the registrant in the successful defense of any action, suit or
proceeding) is asserted by such trustee, officer or controlling person in
connection with the securities being registered, the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.
 
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
 
     (c) 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 a form of such Agreement is filed herewith as Exhibit
9(c) and described in Part B hereof under "Management of the Fund," the
Registrant is not a party to any management-related service contract.
 
ITEM 32. UNDERTAKINGS
 
     Registrant hereby undertakes to provide an Annual Report to Shareholders or
prospective investors, free of charge, upon request.
 
     Registrant undertakes to file a post-effective amendment containing
financial statements, which need not be audited, within 4-6 months from
effectiveness under the Securities Act of 1933.
<PAGE>   65
 
                                   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 18th day of March, 1997.
    
 
VANGUARD TREASURY FUND
 
BY: (Raymond J. Klapinsky)
    John C. Bogle*, Chairman
   
    March 18, 1997
    
 
BY: (Raymond J. Klapinsky)
    John J. Brennan*, President & Chief Executive Officer
   
    March 18, 1997
    
 
BY: (Raymond J. Klapinsky)
    Robert E. Cawthorn*, Director
   
    March 18, 1997
    
 
BY: (Raymond J. Klapinsky)
    Barbara B. Hauptfuhrer*, Director
   
    March 18, 1997
    
 
BY: (Raymond J. Klapinsky)
    Bruce K. MacLaury, Director
   
    March 18, 1997
    
 
BY: (Raymond J. Klapinsky)
    Burton G. Malkiel*, Director
   
    March 18, 1997
    
 
BY: (Raymond J. Klapinsky)
    Alfred M. Rankin, Jr.*, Director
   
    March 18, 1997
    
 
BY: (Raymond J. Klapinsky)
    John C. Sawhill*, Director
   
    March 18, 1997
    
 
BY: (Raymond J. Klapinsky)
    James O. Welch, Jr.*, Director
   
    March 18, 1997
    
 
BY: (Raymond J. Klapinsky)
    J. Lawrence Wilson*, Director
   
    March 18, 1997
    
 
BY: (Raymond J. Klapinsky)
    Richard F. Hyland*, Treasurer and Principal
    Financial Officer and Accounting Officer
   
    March 18, 1997
    
 
*By Power of Attorney. See File Number 2-14336, January 23, 1990. Incorporated
by Reference.
<PAGE>   66
 
                             VANGUARD TREASURY FUND
 
                               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 Prospectus and
Statement of Additional Information constituting parts of this Post-Effective
Amendment No. 2 to the registration statement on Form N-1A (the "Registration
Statement") of our report dated December 31, 1996, relating to the financial
statements and financial highlights appearing in the 1996 Annual Report to
Shareholders of Vanguard Money Market Reserves, which are also incorporated by
reference into the Registration Statement. We also consent to the references to
us under the heading "Financial Highlights" in the Prospectus and under the
heading "Financial Statements" in the Statement of Additional Information.
    
 
PRICE WATERHOUSE LLP
 
Philadelphia, PA
   
March 13, 1997
    

<PAGE>   1
 
                                                                       EX-99.B16
 
               SCHEDULE FOR COMPUTATION OF PERFORMANCE QUOTATIONS
 
                 VANGUARD TREASURY FUND - TREASURY MONEY MARKET
               PORTFOLIO (FORMERLY THE U.S. TREASURY PORTFOLIO OF
                        VANGUARD MONEY MARKET RESERVES)
 
   
1.  AVERAGE ANNUAL TOTAL RETURN (AS OF NOVEMBER 30, 1996)
    
 
   
     (P1 + T)(N) = ERV
    
 
  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
 
   
  ONE YEAR
    
     P = $1,000
   
     T = 5.11%
    
     N = 1
   
     ERV = $1,051.09
    
 
  FIVE YEARS
     P = $1,000
   
     T = 4.15%
    
     N = 5
   
     ERV = $1,225.22
    
 
  TEN YEARS
     P = $1,000
   
     T = 5.65%
    
     N = 10
   
     ERV = $1,732.42
    

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0001021882
<NAME> VANGUARD TREASURY FUND
<SERIES>
   <NUMBER> 03
   <NAME> TREASURY MONEY MARKET PORTFOLIO (FORMERLY THE U.S. TREASURY
          PORTFOLIO OF VANGUARD MONEY MARKET RESERVES, INC.)
<MULTIPLIER> 1,000                        
<CURRENCY> US                                  
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          NOV-30-1996
<PERIOD-START>                             DEC-01-1995
<PERIOD-END>                               NOV-30-1996
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                        2,775,286
<INVESTMENTS-AT-VALUE>                       2,775,286
<RECEIVABLES>                                  370,220
<ASSETS-OTHER>                                     269
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                               3,145,875
<PAYABLE-FOR-SECURITIES>                       216,431
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       12,914
<TOTAL-LIABILITIES>                            229,345
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     2,916,650
<SHARES-COMMON-STOCK>                        2,916,630
<SHARES-COMMON-PRIOR>                        2,527,188
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          (120)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                                 2,916,530
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              148,220
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   8,933
<NET-INVESTMENT-INCOME>                        139,287
<REALIZED-GAINS-CURRENT>                         (340)
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                          138,947
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      139,287
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      3,440,062
<NUMBER-OF-SHARES-REDEEMED>                  3,183,441
<SHARES-REINVESTED>                            132,823
<NET-CHANGE-IN-ASSETS>                         389,104
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          220
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              338
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  8,933
<AVERAGE-NET-ASSETS>                         2,791,732
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                  0.050
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                             0.050
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                   0.32
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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