VANGUARD TREASURY FUND
485BPOS, 1997-01-23
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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. 1
    
                                      AND
 
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                  ACT OF 1940
   
                                AMENDMENT NO. 2
    
                             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 January 24, 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.
 
   
     REGISTRANT HAS ELECTED TO REGISTER AN INDEFINITE NUMBER OF SHARES UNDER
THIS REGISTRATION STATEMENT PURSUANT TO RULE 24F-2 UNDER THE INVESTMENT COMPANY
ACT OF 1940.
    
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<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 Objective; Investment
                                                               Limitations; Investment Policies;
                                                               General Information
    Item 5.   Management of the Fund........................   Directors and Officers; Management of
                                                               the Fund; The Vanguard Group
    Item 6.   Capital Stock and Other Securities............   Opening an Account and Purchasing
                                                               Shares; Selling Your Shares; The
                                                               Share Price of the Portfolio;
                                                               Dividends and Taxes; General
                                                               Information
    Item 7.   Purchase of Securities Being Offered..........   Cover Page; Opening an Account and
                                                               Purchasing Shares
    Item 8.   Redemption or Repurchase......................   Selling Shares
    Item 9.   Pending Legal Proceedings.....................   Not Applicable
 
<CAPTION>
                         FORM N-1A                                     LOCATION IN STATEMENT
                        ITEM NUMBER                                  OF ADDITIONAL INFORMATION
<C>           <S>                                              <C>
   Item 10.   Cover Page....................................   Cover Page
   Item 11.   Table of Contents.............................   Cover Page
   Item 12.   General Information and History...............   Investment Objectives and Policies
   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
   
                                                       VANGUARD MONEY
                                                       MARKET PORTFOLIOS

                                                       Institutional Prospectus
                                                       January 24, 1997



VANGUARD MONEY
MARKET RESERVES

- -  PRIME PORTFOLIO

- -  FEDERAL PORTFOLIO


VANGUARD TREASURY FUND

- -  TREASURY MONEY MARKET PORTFOLIO


This prospectus contains financial data for the Portfolios through the fiscal
year ended November 30, 1995, and the six months ended May 31, 1996.





                                                    A member of
                                                 THE VANGUARD GROUP(R)
    
<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

- - For Plan Participants                           15

- - For Other Institutional Investors               15

Accessing Fund Information by Computer            16

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.

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 December 2, 1996) 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>   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 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 manages each of the three Portfolios.

AVERAGE ANNUAL TOTAL RETURNS--PERIODS ENDED MAY 31, 1996

<TABLE>
<CAPTION>
                        1 YEAR  5 YEARS  10 YEARS
                        -------------------------
<S>                     <C>     <C>      <C>
Treasury Money
  Market Portfolio*      5.3%     4.2%      5.7%

Lipper U.S. Treasury
  Money Market Average   5.0      3.9       5.5

Federal Portfolio        5.5%     4.4%      5.9%

Lipper U.S. Government
  Money Market Average   5.0      3.9       5.4

Prime Portfolio          5.5%     4.4%      6.0%

Lipper Non-Government
  Money Market Average   5.1      4.0       5.6
- -------------------------------------------------
</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 5/31/96:   $2.76 billion  $2.81 billion  $19.88 billion

EXPENSE RATIO FOR THE YEAR
  ENDED 11/30/95:               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 the Vanguard Treasury Fund and renamed
   the Treasury Money Market Portfolio of Vanguard Treasury Fund.

** 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,
1995 (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, 1995).


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 1995 was 0.32%, or $3.20 per $1,000 of average net assets. The average
money market fund had expenses in 1995 of 0.74%, or $7.40 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, 1995, and the six
months ended May 31, 1996. The financial highlights for the fiscal years ended
November 30 were audited by Price Waterhouse LLP, independent accountants. The
information for the six-month period ended May 31, 1996, has not been audited by
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) and Semi-Annual Report to shareholders. The Annual
Report and Semi-Annual Report (which include information on the U.S. Treasury
Portfolio) are incorporated by reference in the Statement of Additional
Information and in this prospectus, and contain a more complete discussion of
each Portfolio's performance. You may have the Reports sent to you without
charge by writing to or calling Vanguard (see back cover).

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------
                                                                 TREASURY MONEY MARKET PORTFOLIO*
                                                ------------------------------------------------------------------
                                 SIX MONTHS                            YEAR ENDED NOVEMBER 30,
                                   ENDED        ------------------------------------------------------------------
                                  5/31/96        1995        1994        1993        1992        1991        1990 
- ------------------------------------------------------------------------------------------------------------------
<S>                             <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
                                 ---------------------------------------------------------------------------------
INVESTMENT OPERATIONS
  Net Investment Income             .025          .053        .036        .028        .036        .058        .077
  Net Realized and
    Unrealized Gain (Loss)
    on Investments                    --            --          --          --          --          --          --
                                 ---------------------------------------------------------------------------------
    TOTAL FROM INVESTMENT
     OPERATIONS                     .025          .053        .036        .028        .036        .058        .077
- ------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net
    Investment Income              (.025)        (.053)      (.036)      (.028)      (.036)      (.058)      (.077)
  Distributions from
    Realized Capital Gains            --            --          --          --          --          --          -- 
                                 ---------------------------------------------------------------------------------
    TOTAL DISTRIBUTIONS            (.025)        (.053)      (.036)      (.028)      (.036)      (.058)      (.077)
- ------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE,
 END OF PERIOD                     $1.00         $1.00       $1.00       $1.00       $1.00       $1.00       $1.00
==================================================================================================================
TOTAL RETURN                       2.53%         5.47%       3.63%       2.86%       3.68%       5.94%       8.02%
==================================================================================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
 Period (Millions)                $2,766        $2,527      $2,056      $1,751      $2,321      $2,092      $1,594
Ratio of Expenses to
  Average Net Assets             0.32%**         0.32%       0.32%       0.32%       0.30%       0.30%       0.30%
Ratio of Net Investment
  Income to Average
  Net Assets                     4.98%**         5.33%       3.59%       2.83%       3.60%       5.76%       7.74%
</TABLE>

<TABLE>
<CAPTION>
                                 -----------------------------------------
                                      TREASURY MONEY MARKET PORTFOLIO*
                                 -----------------------------------------
                                          YEAR ENDED NOVEMBER 30,
                                 ------------------------------------------
                                  1989        1988        1987        1986
- ---------------------------------------------------------------------------
<S>                              <C>         <C>         <C>        <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD             $1.00       $1.00       $1.00       $1.00
                                 ------------------------------------------
INVESTMENT OPERATIONS
  Net Investment Income            .085        .068        .058        .060
  Net Realized and
    Unrealized Gain (Loss)
    on Investments                   --          --          --          --
                                 ------------------------------------------
TOTAL FROM INVESTMENT
  OPERATIONS                       .085        .068        .058        .060
- ---------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net
    Investment Income             (.085)      (.068)      (.058)      (.060)
  Distributions from
   Realized Capital Gains            --          --          --          --
                                 ------------------------------------------
TOTAL DISTRIBUTIONS               (.085)      (.068)      (.058)      (.060)
- ---------------------------------------------------------------------------
NET ASSET VALUE,
 END OF PERIOD                    $1.00       $1.00       $1.00       $1.00
===========================================================================
TOTAL RETURN                      8.89%       7.02%       5.99%       6.15%
===========================================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
 Period (Millions)                 $412        $140        $113         $56
Ratio of Expenses to
  Average Net Assets             0.31%+      0.70%+      0.79%+      0.93%+
Ratio of Net Investment
  Income to Average
  Net Assets                      8.44%       6.85%       5.80%       6.00%
</TABLE>

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



                                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 1995 with a net asset value
(price) of $1.00 per share. During the year, the Portfolio earned $0.053 per
share from investment income (interest and dividends). All of these earnings
were returned to shareholders in the form of dividend distributions. The
earnings ($0.053 per share) less distributions ($0.053 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 5.47% for the year.

  As of November 30, 1995, the Portfolio had nearly $2.53 billion in net assets;
an expense ratio of 0.32% ($3.20 per $1,000 of net assets); and net investment
income amounting to 5.33% of its average net assets.



                                       5
    
<PAGE>   10
   
                                PLAIN TALK ABOUT
                   HOW TO READ THE FINANCIAL HIGHLIGHTS TABLE

Refer to the detailed explanation on page 5.

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------
                                                                            FEDERAL PORTFOLIO
                                           ----------------------------------------------------------------------------
                               SIX MONTHS                                  YEAR ENDED NOVEMBER 30,
                                 ENDED     ----------------------------------------------------------------------------
                                5/31/96     1995      1994      1993      1992      1991      1990      1989      1988
- -----------------------------------------------------------------------------------------------------------------------
<S>                            <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
                                ---------------------------------------------------------------------------------------
INVESTMENT OPERATIONS
  Net Investment Income           .026       .056      .038      .029      .038      .060      .078      .088      .070
  Net Realized and
    Unrealized Gain (Loss)
    on Investments                  --         --        --        --        --        --        --        --        --
                                ---------------------------------------------------------------------------------------
    TOTAL FROM INVESTMENT
    OPERATIONS                    .026       .056      .038      .029      .038      .060      .078      .088      .070
- -----------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net
    Investment Income            (.026)     (.056)    (.038)    (.029)    (.038)    (.060)    (.078)    (.088)    (.070)
  Distributions from
    Realized Capital Gains          --         --        --        --        --        --        --        --        --
                                ---------------------------------------------------------------------------------------
    TOTAL DISTRIBUTIONS          (.026)     (.056)    (.038)    (.029)    (.038)    (.060)    (.078)    (.088)    (.070)
- -----------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE,
  END OF PERIOD                  $1.00      $1.00     $1.00     $1.00     $1.00     $1.00     $1.00     $1.00     $1.00
=======================================================================================================================
TOTAL RETURN                     2.61%      5.77%     3.82%     2.98%     3.83%     6.18%     8.14%     9.15%     7.20%
=======================================================================================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
  Period (Millions)             $2,815     $2,637    $2,196    $1,907    $1,986    $2,000    $1,950    $1,531    $1,214
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%
Ratio of Net Investment
  Income to Average
  Net Assets                    5.14%*      5.61%     3.78%     2.94%     3.76%     6.01%     7.90%     8.78%     7.00%
- -----------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
- ------------------------------------------------------
                                  FEDERAL PORTFOLIO
                               -----------------------
                               YEAR ENDED NOVEMBER 30,
                               -----------------------
                                 1987            1986
- ------------------------------------------------------
<S>                            <C>              <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD            $1.00           $1.00
                                ----------------------
INVESTMENT OPERATIONS
  Net Investment Income           .061            .064
  Net Realized and
    Unrealized Gain (Loss)
    on Investments                  --              --
                                ----------------------
    TOTAL FROM INVESTMENT
    OPERATIONS                    .061            .064
- ------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net
    Investment Income            (.061)          (.064)
  Distributions from
    Realized Capital Gains          --              --
                                ----------------------
    TOTAL DISTRIBUTIONS          (.061)          (.064)
- ------------------------------------------------------
NET ASSET VALUE,
  END OF PERIOD                  $1.00           $1.00
======================================================
TOTAL RETURN                     6.25%           6.56%
======================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
  Period (Millions)               $839            $545
Ratio of Expenses to
  Average Net Assets             0.37%           0.48%
Ratio of Net Investment
  Income to Average
  Net Assets                     6.10%           6.40%
- ------------------------------------------------------
</TABLE>

*Annualized.


<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------------
                                                                           PRIME PORTFOLIO
- ----------------------------------------------------------------------------------------------------------------------------
                            SIX MONTHS                                  YEAR ENDED NOVEMBER 30,
                              ENDED      -----------------------------------------------------------------------------------
                             5/31/96       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         .026        .057         .038         .030        .038        .062         .080         .090
  Net Realized and
    Unrealized Gain (Loss)
    on Investments                --          --           --           --          --          --           --           --
                             -----------------------------------------------------------------------------------------------
    TOTAL FROM INVESTMENT
      OPERATIONS                .026        .057         .038         .030        .038        .062         .080         .090
- ----------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net
    Investment Income          (.026)      (.057)       (.038)       (.030)      (.038)      (.062)       (.080)       (.090)
  Distributions from
    Realized Capital Gains        --          --           --           --          --          --           --           --
                             -----------------------------------------------------------------------------------------------
    TOTAL DISTRIBUTIONS        (.026)      (.057)       (.038)       (.030)      (.038)      (.062)       (.080)       (.090)
- ----------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE,
  END OF PERIOD              $  1.00     $  1.00      $  1.00      $  1.00     $  1.00     $  1.00      $  1.00      $  1.00
============================================================================================================================
TOTAL RETURN                   2.63%       5.82%        3.87%        3.02%       3.89%       6.39%        8.32%        9.40%
============================================================================================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
  Period (Millions)          $19,880     $18,764      $15,109      $12,367     $12,638     $13,496      $13,579      $11,067
Ratio of Expenses to
  Average Net Assets          0.32%*       0.32%        0.32%        0.32%       0.30%       0.30%        0.30%        0.28%
Ratio of Net Investment
  Income to Average
  Net Assets                  5.21%*       5.64%        3.84%        2.98%       3.82%       6.20%        8.06%        9.05%
- ----------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
- -----------------------------------------------------------
                                     PRIME PORTFOLIO
- -----------------------------------------------------------
                                YEAR ENDED NOVEMBER 30,
                            -------------------------------
                              1988        1987        1986
- -----------------------------------------------------------
<S>                          <C>         <C>         <C>
NET ASSET VALUE,
  BEGINNING OF PERIOD         $1.00        $1.00      $1.00
                             ------------------------------
INVESTMENT OPERATIONS
  Net Investment Income         .072        .063       .066
  Net Realized and
    Unrealized Gain (Loss)
    on Investments               --          --          --
                             ------------------------------
    TOTAL FROM INVESTMENT
      OPERATIONS               .072        .063        .066
- -----------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net
    Investment Income         (.072)      (.063)      (.066)
  Distributions from
    Realized Capital Gains       --          --          --
                             ------------------------------
    TOTAL DISTRIBUTIONS       (.072)      (.063)      (.066)
- -----------------------------------------------------------
NET ASSET VALUE,
  END OF PERIOD               $1.00       $1.00       $1.00
===========================================================
TOTAL RETURN                  7.47%       6.49%       6.78%
===========================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
  Period (Millions)          $6,863      $4,088      $2,186
Ratio of Expenses to
  Average Net Assets          0.33%       0.37%       0.48%
Ratio of Net Investment
  Income to Average
  Net Assets                  7.28%       6.30%       6.60%
- -----------------------------------------------------------
</TABLE>

*Annualized.



                                       6
    
<PAGE>   11
   
     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.

================================================================================
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 GRAPHIC] throughout the 
prospectus. It is used to mark detailed information about each type of risk 
that you, as a shareholder 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 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.

     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.

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 Portfolio's policies are
not fundamental and can be changed by the Funds' Boards of Directors or Trustees
without shareholder approval. However, before making any important change in its
policies, the Funds 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 GRAPHIC] 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. Note in this illustration how short-term yields tend to fluctuate more
than longer-term yields.

                    SHORT-TERM AND LONG-TERM MONTH-END YIELDS
                                   (1991-1995)


                                [CHART GRAPHIC]

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>   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 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 Investor 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 sale restrictions according to the Securities Act of 1933.

[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 itself. 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 

                                       10
    
<PAGE>   15
   
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 Statement of
Additional Information are fundamental and may be changed only by approval of a
majority of the Funds' 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 5/31/96


                             [THREE CHART GRAPHICS]



*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.

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

- -  As part of a 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 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 $230 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, 1995, the Group managed some $67 billion
in assets.

     The managers responsible for the Portfolios' investments are:

     IAN A. MACKINNON, Senior Vice President of Vanguard; 22 years fixed income
investment experience, 16 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; 18 years
fixed income investment experience; B.S., the University of Pennsylvania,
M.B.A., Northwestern University.

     JOHN HOLLYER, Principal of Vanguard and Portfolio Manager; 9 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, 1995, the three Portfolios
paid a total of $2,788,000 in investment advisory expenses ($297,000 for the
U.S. Treasury Portfolio, $310,000 for the Federal Portfolio, and $2,181,000 for
the Prime Portfolio). For the six months ended May 31, 1996, the three
Portfolios paid a total of $1,461,000 ($152,000 for the U.S. Treasury Portfolio,
$155,000 for the Federal Portfolio, and $1,154,000 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.

                                       14
    
<PAGE>   19
   
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 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 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>   20
   
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 or performance.

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

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

ACCESSING FUND INFORMATION BY COMPUTER


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

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


SHARES OF THE PORTFOLIOS MAY ONLY BE SOLD IN THOSE STATES IN WHICH THEY ARE
REGISTERED. THE PORTFOLIOS' SHARES ARE CURRENTLY REGISTERED FOR SALE IN ALL 50
STATES, AND THE PORTFOLIOS INTENDS TO MAINTAIN SUCH REGISTRATION.


                                       16
    
<PAGE>   21
   
GLOSSARY OF INVESTMENT TERMS

CASH RESERVES

Cash deposits as well as short-term bank deposits, money market instruments, 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>   22
   
                                                       [VANGUARD GROUP LOGO]
                                                       THE VANGUARD GROUP(R)

                                                        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

On America Online(R)
Keyword: Vanguard

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

To send e-mail to Vanguard
[email protected]

(C) 1997 Vanguard Marketing CENTER Corporation, Distributor


I030N
    
<PAGE>   23
 
                                     PART B
 
                             VANGUARD TREASURY FUND
 
                      STATEMENT OF ADDITIONAL INFORMATION
 
   
                                JANUARY 24, 1997
    
 
   
     This Statement is not a prospectus but should be read in conjunction with
the Fund's current Prospectus (dated December 2, 1996 for the Retail version and
January 24, 1997 for the Institutional version). 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.
The Portfolio of the Fund in effect represents a separate mutual fund with its
own investment objective and policies.
 
                       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>   24
 
position where more than 10% of the value of its net assets are invested in
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
outstanding shares (as defined in the Investment Company Act of 1940) of the
Portfolio. 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; provided further, however, 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>   25
 
      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,
purchase restricted securities 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.
 
     Although not fundamental policies subject to shareholder vote, as long as
the Fund's shares are registered for sale in certain states, the Portfolio may
not purchase or retain securities of an issuer if an officer or director of such
issuer is an officer or Trustee of the Fund or its investment adviser and one or
more of such officers or directors (trustees) of the Fund or its investment
adviser owns beneficially more than 1/2% of the shares of securities of such
issuer and all such directors and officers owning more than 1/2% of such shares
or securities together own more than 5% of such shares or securities.
 
     The above-mentioned investment limitations are considered at the time
investment securities are purchased.
 
                                        3
<PAGE>   26
 
                             YIELD AND TOTAL RETURN
 
     The yield of the Portfolio for the 7-day period ended May 31, 1996 is set
forth below. Yields are calculated daily for the Portfolio.
 
<TABLE>
    <S>                                                                                 <C>
    Treasury Money Market Portfolio*.................................................   4.87%
</TABLE>
 
     The average annual total return of the Portfolio for the one-, five- and
ten-year periods ending May 31, 1996 is set forth below:
 
<TABLE>
<CAPTION>
                               1 YEAR ENDED     3 YEARS ENDED     5 YEARS ENDED     10 YEARS ENDED
                                 5/31/96           5/31/96           5/31/96           5/31/96
                               ------------     -------------     -------------     --------------
    <S>                        <C>              <C>               <C>               <C>
    Treasury Money Market
      Portfolio*.............       5.3%              4.4%              4.2%              5.7%
</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 May 31, 1996.
 
<TABLE>
<CAPTION>
                                                                                      TREASURY MONEY
                                                                                     MARKET PORTFOLIO
                                                                                     ----------------
                                                                                         5/31/96
                                                                                     ----------------
<S>                                                                                  <C>
Value of account at beginning of period...........................................       $1.00000
Value of same account at end of period*...........................................        1.00094
                                                                                     ----------------
Net Change in account value.......................................................       $ .00094
Annualized Current Net Yield (Net
  Change X 365/7) average net asset value.........................................           4.87
Effective Yield [(Net Change)+1]365/7-1...........................................           5.02
Average Weighted Maturity of Investments..........................................        49 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>   27
 
                               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 1% 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>   28
 
     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>   29
 
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 INDEX (20 YEAR) BOND -- is a yield index on current coupon
high-grade general obligation municipal bonds.
 
STANDARD & POOR'S PREFERRED INDEX -- is a yield index based upon the average
yield of four high-grade, non-callable preferred stock issues.
 
NASDAQ INDUSTRIAL INDEX -- is composed of more than 3,000 industrial issues. It
is a value-weighted index calculated on price change only and does not include
income.
 
COMPOSITE INDEX -- 70% Standard & Poor's 500 Index and 30% NASDAQ Industrial
Index.
 
COMPOSITE INDEX -- 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>   30
 
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>   31
 
                             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>   32
 
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, 1995, Vanguard
Treasury Money Market Portfolio (then known as U.S. Treasury Portfolio, a series
of Vanguard Money Market Reserves, Inc.), had contributed capital of $238,000 to
Vanguard, representing 14.4% 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, 1995 and the six months ended May 31, 1996, the
Portfolio's share of Vanguard's actual net costs of operation relating to
management and
administrative services (including transfer agency) totaled approximately
$3,192,000 and $2,080,000, respectively.
 
     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>   33
 
assets. During the fiscal year ended November 30, 1995 and the six months ended
May 31, 1996, the Portfolio paid approximately $627,000 and $414,000,
respectively of the Group's distribution and marketing expenses or .03 of 1% and
 .03 of 1%, respectively 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, 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, 1993,
1994, 1995 and the six months ended May 31, 1996, the Portfolio paid
approximately $196,000, $212,000, $297,000 and $152,000, 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(3)
- ---------------------------    ------------     ---------------------     ---------------     -----------------------
<S>                            <C>              <C>                       <C>                 <C>
John C. Bogle(1),(2)             $408,820              $ 4,320                     --                      --
John J. Brennan(2)               $205,080              $ 4,320                     --                      --
Barbara Barnes Hauptfuhrer       $  9,344              $ 1,571                $15,000                 $60,000
Robert E. Cawthorn               $  9,344              $ 1,309                $13,000                 $60,000
Bruce K. MacLaury                $ 10,131              $ 1,549                $12,000                 $55,000
Burton G. Malkiel                $  9,344              $ 1,047                $15,000                 $60,000
Alfred M. Rankin, Jr.            $  9,344              $   827                $15,000                 $60,000
John C. Sawhill                  $  9,344              $   982                $15,000                 $60,000
James O. Welch, Jr.              $  9,344              $ 1,209                $15,000                 $60,000
J. Lawrence Wilson               $  9,344              $   873                $15,000                 $60,000
</TABLE>
 
(1) For the period reported in this table, Mr. Bogle was the Fund's Chief
    Executive Officer, and therefore an "Interested Trustee" under the Federal
    securities laws. Mr. Bogle receives no compensation for his service as
    Trustee.
(2) As "Interested Trustees," Messrs. Bogle and Brennan receive no compensation
    for their service as Trustees. Compensation amounts reported for Messrs.
    Bogle and Brennan relate to their respective positions as Chief Executive
    Officer and President of the Fund.
(3) 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
    (27 in the case of Mr. MacLaury).
* Formerly the U.S. Treasury Portfolio of Vanguard Money Market Reserves.
 
                                       11
<PAGE>   34
 
                    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 Portfolio's financial statements for the year ended November 30, 1995,
including the financial highlights for each of the five fiscal years in the
period ended November 30, 1995, appearing in the Vanguard Money Market Reserves
1995 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 unaudited financial
statements and financial highlights of the Portfolio for the six months ended
May 31, 1996, as set forth in the Vanguard Money Market Reserves Semi-Annual
Report to Shareholders, are incorporated herein by reference. The Vanguard Money
Market Reserves Annual Report and Semi-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>   35
 
                                     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, 1995, including Price Waterhouse LLP's report thereon, and the unaudited
financial statements for the six months ended May 31, 1996, are incorporated by
reference, in the Statement of Additional Information, from the Registrant's
1995 Annual Report and the May 31, 1996 Semi-Annual Report to Shareholders which
has been filed with the Commission. The financial statements included in the
Annual Report and Semi-Annual Report are:
 
      1. Statement of Net Assets as of November 30, 1995 and as of May 31, 1996.
      2. Statement of Operations for the year ended November 30, 1995 and for
         six months ended May 31, 1996.
      3. Statement of Changes in Net Assets for each of the two years in the
         period ended November 30, 1995 and the six months ended May 31, 1996.
      4. Financial Highlights for each of the five years in the period ended
         November 30, 1995 and the six months ended May 31, 1996.
      5. Notes to Financial Statements at November 30, 1995 and May 31, 1996.
      6. Report of Independent Accountants, December 29, 1995.
 
     (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
**Previously filed
 
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>   36
 
ITEM 26. NUMBER OF HOLDERS OF SECURITIES
 
     As of August 31, 1996, there were no shareholders of 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>   37
 
                                   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 Pre-Effective
Amendment No. 1 to the 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 23rd day of January, 1997.
    
 
VANGUARD TREASURY FUND
 
BY: (Raymond J. Klapinsky)
    John C. Bogle*, Chairman
   
    January 23, 1997
    
 
BY: (Raymond J. Klapinsky)
    John J. Brennan*, President & Chief Executive Officer
   
    January 23, 1997
    
 
   
BY: (Raymond J. Klapinsky)
    
   
    Robert E. Cawthorn*, Director
    
   
    January 23, 1997
    
 
   
BY: (Raymond J. Klapinsky)
    
   
    Barbara B. Hauptfuhrer*, Director
    
   
    January 23, 1997
    
 
   
BY: (Raymond J. Klapinsky)
    
   
    Bruce K. MacLaury, Director
    
   
    January 23, 1997
    
 
   
BY: (Raymond J. Klapinsky)
    
   
    Burton G. Malkiel*, Director
    
   
    January 23, 1997
    
 
   
BY: (Raymond J. Klapinsky)
    
   
    Alfred M. Rankin, Jr.*, Director
    
   
    January 23, 1997
    
 
   
BY: (Raymond J. Klapinsky)
    
   
    John C. Sawhill*, Director
    
   
    January 23, 1997
    
 
   
BY: (Raymond J. Klapinsky)
    
   
    James O. Welch, Jr.*, Director
    
   
    January 23, 1997
    
 
   
BY: (Raymond J. Klapinsky)
    
   
    J. Lawrence Wilson*, Director
    
   
    January 23, 1997
    
 
BY: (Raymond J. Klapinsky)
   
    Richard F. Hyland*, Treasurer and Principal
    
   
    Financial Officer and Accounting Officer
    
   
    January 23, 1997
    
 
*By Power of Attorney. See File Number 2-14336, January 23, 1990. Incorporated
by Reference.
<PAGE>   38
 
                             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-99.B27
</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. 1 to the registration statement on Form N-1A (the "Registration
Statement") of our report dated December 29, 1995, relating to the financial
statements and financial highlights appearing in the 1995 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
    
   
January 21, 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, 1995)
    
 
   
     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
    
 
   
  DUE YEAR
    
   
     P = $1,000
    
   
     T = +5.47%
    
   
     N = 1
    
   
     ERV = $1,054.71
    
 
   
  FIVE YEARS
    
   
     P = $1,000
    
   
     T = +4.31%
    
   
     N = 5
    
   
     ERV = $1,235.01
    
 
   
  TEN YEARS
    
   
     P = $1,000
    
   
     T = +5.75%
    
   
     N = 10
    
   
     ERV = $1,749.61
    

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0001021882
<NAME> VANGUARD TREASURY FUND
<SERIES>
   <NUMBER> 03
   <NAME> TREASURY MONEY MARKET PORTFOLIO (FORMERLY U.S. TREASURY PORTFOLIO OF
VANGUARD MONEY MARKET RESERVES, INC.)
<MULTIPLIER> 1,000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          NOV-30-1996
<PERIOD-START>                             DEC-01-1995
<PERIOD-END>                               MAY-31-1996
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                        2,738,388
<INVESTMENTS-AT-VALUE>                       2,738,388
<RECEIVABLES>                                  687,538
<ASSETS-OTHER>                                     288
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                               3,426,214
<PAYABLE-FOR-SECURITIES>                       648,594
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       11,132
<TOTAL-LIABILITIES>                            659,726
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     2,766,509
<SHARES-COMMON-STOCK>                        2,766,489
<SHARES-COMMON-PRIOR>                        2,527,188
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                           (21)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                                 2,766,488
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                               73,258
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                   4,409
<NET-INVESTMENT-INCOME>                         68,849
<REALIZED-GAINS-CURRENT>                         (241)
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                           68,608
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       68,849
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      1,995,352
<NUMBER-OF-SHARES-REDEEMED>                  1,821,747
<SHARES-REINVESTED>                             65,698
<NET-CHANGE-IN-ASSETS>                         239,062
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                          220
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              152
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  4,409
<AVERAGE-NET-ASSETS>                         2,755,581
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                  0.025
<PER-SHARE-GAIN-APPREC>                              0
<PER-SHARE-DIVIDEND>                             0.025
<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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