VANGUARD TREASURY FUND
497, 1996-12-06
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<PAGE>   1
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                   FORM N-1A
                  REGISTRATION STATEMENT (NO. 33-111763) UNDER
                           THE SECURITIES ACT OF 1933
                         PRE-EFFECTIVE AMENDMENT NO. 1
                        POST-EFFECTIVE AMENDMENT NO.  _
                                      AND
 
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                  ACT OF 1940
                                AMENDMENT NO.  _
                             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 December 2, 1996.
 
                 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.
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATES AS
MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE A
FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT
SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF THE
SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION ACTING PURSUANT TO SUCH SECTION 8(a),
MAY DETERMINE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<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

Prospectus
December 2, 1996

Vanguard Money
Market Reserves

- - Prime Portfolio

- - Federal Portfolio

  Vanguard Treasury Fund

- - Treasury Money Market Portfolio

This prospectus contains financial data for the Portfolios through May 31,
1996.


[A MEMBER OF THE VANGUARD GROUP LOGO]


<PAGE>   4
VANGUARD MONEY MARKET RESERVES,
VANGUARD TREASURY MONEY MARKET PORTFOLIO               Money Market Mutual Funds


CONTENTS

Portfolio Expenses                                                       3

Financial Highlights                                                     5

A Word About Risk                                                        7

The Portfolios' Objectives                                               7

Who Should Invest                                                        7

Investment Policies                                                      8

Investment Limitations                                                  11

Investment Performance                                                  11

Share Price                                                             13

Dividends and Taxes                                                     13

The Funds and Vanguard                                                  13

Investment Adviser                                                      14

General Information                                                     14

Investing with Vanguard                                                 15

Services and Account Features                                           15

Types of Accounts                                                       16

Distribution Options                                                    17

Buying Shares                                                           17

Redeeming Shares                                                        19

Fund and Account Updates                                                21

Prospectus Postscript                                                   23

Risk Quiz                                                               24

Glossary                                                 Inside Back Cover

INVESTMENT OBJECTIVES AND POLICIES

Vanguard Money Market Reserves, Inc. is a diversified, open-end investment
management 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 management company as well.

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

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

FEES AND EXPENSES

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

ADDITIONAL INFORMATION ABOUT THE PORTFOLIOS

Statements of Additional Information (dated December 2, 1996) containing more
information about the Portfolios are, by reference, part of this prospectus and
may be obtained without charge by writing to Vanguard or by calling our Investor
Information Department at 1-800-662-7447.

   For investments of $10 million or more, Vanguard Money Market Reserves offers
Prime Portfolio Institutional Shares (available through a separate prospectus).
The Prime Portfolio and the Prime Portfolio Institutional Shares do not have the
same expenses; as a result, the two Portfolios' performance could differ.

WHY READING THIS PROSPECTUS IS IMPORTANT

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

WHO SHOULD INVEST (page 7)
- - Investors seeking a money market mutual fund as part of a balanced and
  diversified investment program.
- - Investors uncomfortable with share-price fluctuations.
- - Investors seeking current income.
- - Investors needing a temporary holding place for a portion of their assets.

WHO SHOULD NOT INVEST
- - Investors seeking growth of their investment over time.
- - Investors looking for a fund that invests in stocks or bonds.

RISKS OF THE PORTFOLIOS (pages 7 - 10)
Each Portfolio is subject to income risk (the chance that falling short-term
interest rates will cause the Portfolios' income -- and thus the Portfolios'
return -- to decline) and manager risk (the chance that poor security selection
will cause a Portfolio to lag similar funds). In addition, while the credit
quality of all three Portfolios is expected to be very high, each Portfolio is
subject to some degree of credit risk (the chance that the issuer of a security
will be unable to pay interest and principal in a timely manner). More detailed
information about risk -- including risks specific to each Portfolio -- is
provided beginning on page 8.

DIVIDENDS (page 13)
Dividends are declared daily and paid on the first business day of each month.

                                                  Vanguard Money Market Reserves
                                        Vanguard Treasury Money Market Portfolio

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

MINIMUM INITIAL INVESTMENT FOR EACH PORTFOLIO: $3,000; $1,000 for IRAs and
custodial accounts for minors

ACCOUNT FEATURES (pages 15-19)
- - Telephone Redemption
- - Checkwriting
- - Vanguard Direct Deposit Service(SM)
- - Vanguard Automatic Exchange Service(SM)
- - Vanguard Fund Express(R)
- - Vanguard Dividend Express(SM)

AVERAGE ANNUAL TOTAL RETURNS -- PERIODS ENDED 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:                   12/1/96          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%

FEES
  LOADS, 12b-1 MARKETING FEES:     None              None              None
  SUITABLE FOR IRAS:                Yes               Yes               Yes

NEWSPAPER ABBREVIATION:**        VangTrsy           VangFdl           VangPr

VANGUARD FUND NUMBER:               050               033               030
</TABLE>

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

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

  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 Revenue - 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 includes 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 Vanguard or by calling our Investor Information Department.
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                           TREASURY MONEY MARKET 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        .025          .053        .036        .028        .036        .058        .077        .085       .068
 Net Realized and
  Unrealized Gain (Loss)
  on Investments                --            --          --          --          --          --          --          --         --
                            --------------------------------------------------------------------------------------------------------
  TOTAL FROM INVESTMENT
  OPERATIONS                  .025          .053        .036        .028        .036        .058        .077        .085       .068
- ------------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
 Dividends from Net
  Investment Income          (.025)        (.053)      (.036)      (.028)      (.036)      (.058)      (.077)      (.085)     (.068)
 Distributions from
  Realized Capital Gains        --            --          --          --          --          --          --          --         --
                            --------------------------------------------------------------------------------------------------------
  TOTAL DISTRIBUTIONS        (.025)        (.053)      (.036)      (.028)      (.036)      (.058)      (.077)      (.085)     (.068)
- ------------------------------------------------------------------------------------------------------------------------------------
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                  2.53%         5.47%       3.63%       2.86%       3.68%       5.94%       8.02%       8.89%      7.02%
====================================================================================================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
 Period (Millions)          $2,766        $2,527      $2,056      $1,751      $2,321      $2,092      $1,594      $  412     $  140
Ratio of Expenses to
 Average Net Assets            .32%**        .32%        .32%        .32%        .30%        .30%        .30%        .31%+      .70%
Ratio of Net Investment
 Income to Average
 Net Assets                   4.98%**       5.33%       3.59%       2.83%       3.60%       5.76%       7.74%       8.44%      6.85%
- ------------------------------------------------------------------------------------------------------------------------------------
<CAPTION>
- --------------------------------------------
                            TREASURY MONEY
                           MARKET 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       .058       .060
 Net Realized and
  Unrealized Gain (Loss)
  on Investments               --         --
                           -----------------
  TOTAL FROM INVESTMENT
  OPERATIONS                 .058       .060
- --------------------------------------------
DISTRIBUTIONS
 Dividends from Net
  Investment Income         (.058)     (.060)
 Distributions from
  Realized Capital Gains       --         --
                           -----------------
  TOTAL DISTRIBUTIONS       (.058)     (.060)
- --------------------------------------------
NET ASSET VALUE,
 END OF PERIOD             $ 1.00     $ 1.00
============================================
TOTAL RETURN                 5.99%      6.15%
============================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
 Period (Millions)         $  113     $   56
Ratio of Expenses to
 Average Net Assets           .79%+      .93%+
Ratio of Net Investment
 Income to Average
 Net Assets                  5.80%      6.00%
- --------------------------------------------
</TABLE>

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

** Annualized.

+Insurance premiums represent .40%, .42%, .44%, and .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 $.053 per share from investment
income (interest and dividends). All of these earnings were returned to
shareholders in the form of dividend distributions. The earnings ($.053 per
share) less distributions ($.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                    5.14%      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              .32%*      .32%       .32%       .32%       .30%       .30%       .30%       .28%       .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%
- -----------------------------------------------------------------------------------------------------------------------------

<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                .37%       .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        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       .057        .038        .030        .038        .062        .080        .090        .072
 Net Realized and
  Unrealized Gain (Loss)
  on Investments                  --         --          --          --          --          --          --          --          --
                              ------------------------------------------------------------------------------------------------------
  TOTAL FROM INVESTMENT
  OPERATIONS                    .026       .057        .038        .030        .038        .062        .080        .090        .072
- ------------------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
 Dividends from Net
  Investment Income            (.026)     (.057)      (.038)      (.030)      (.038)      (.062)      (.080)      (.090)      (.072)
 Distributions from
  Realized Capital Gains          --         --          --          --          --          --          --          --          --
                              ------------------------------------------------------------------------------------------------------
  TOTAL DISTRIBUTIONS          (.026)     (.057)      (.038)      (.030)      (.038)      (.062)      (.080)      (.090)      (.072)
- ------------------------------------------------------------------------------------------------------------------------------------
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                    2.63%      5.82%       3.87%       3.02%       3.89%       6.39%       8.32%       9.40%       7.47%
====================================================================================================================================
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      $6,863
Ratio of Expenses to
 Average Net Assets             .32%*       .32%        .32%        .32%        .30%        .30%        .30%        .28%        .33%
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%       7.28%
- ------------------------------------------------------------------------------------------------------------------------------------

<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        .063        .066
 Net Realized and
  Unrealized Gain (Loss)
  on Investments                --          --
                            ------------------
  TOTAL FROM INVESTMENT
  OPERATIONS                  .063        .066
- ----------------------------------------------
DISTRIBUTIONS
 Dividends from Net
  Investment Income          (.063)      (.066)
 Distributions from
  Realized Capital Gains        --          --
                            ------------------
  TOTAL DISTRIBUTIONS        (.063)      (.066)
- ----------------------------------------------
NET ASSET VALUE,
 END OF PERIOD              $ 1.00      $ 1.00
==============================================
Total Return                  6.49%       6.78%
==============================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of
 Period (Millions)          $4,088      $2,186
Ratio of Expenses to
 Average Net Assets            .37%        .48%
Ratio of Net Investment
 Income to Average
 Net Assets                   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 ICON] throughout the prospectus. It
is used to mark detailed information about each type of risk that you, as a
shareholder of any of the three Portfolios, may confront.

THE PORTFOLIOS' OBJECTIVES

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

WHO SHOULD INVEST

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

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

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

- - You want current income.

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

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

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

- - Each of the Portfolios reserves the right to reject any purchase request
  -including exchanges from other Vanguard Funds -- that


                                       7
<PAGE>   12
  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.

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 Fund'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.

                                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.

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 ICON]

    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)

[LINE GRAPH]

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


                                       8
<PAGE>   13
                                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.


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 ICON]

    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.


                                       9
<PAGE>   14
  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 ICON]

    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 ICON]

    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 ICON]

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

                                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).


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

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

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

INVESTMENT LIMITATIONS

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

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

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

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

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

  The limitations listed in this prospectus and in the 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

[BAR GRAPH]

<TABLE>
<CAPTION>
                                              1 YEAR    3 YEARS    5 YEARS    10 YEARS
                                              ------    -------    -------    --------
<S>                                           <C>        <C>        <C>        <C>
TREASURY MONEY MARKET PORTFOLIO*               5.3%       4.4%       4.2%       5.7%
LIPPER U.S. TREASURY MONEY MARKET AVERAGE      5.0%       4.1%       3.9%       5.5%
</TABLE>

[BAR GRAPH]

<TABLE>
<CAPTION>
                                              1 YEAR    3 YEARS    5 YEARS    10 YEARS
                                              ------    -------    -------    --------
<S>                                            <C>        <C>        <C>        <C>
FEDERAL PORTFOLIO                              5.5%        4.6%       4.4%       5.9%
LIPPER U.S. GOVERNMENT MONEY MARKET AVERAGE    5.0%        4.1%       3.9%       5.4%
</TABLE>

[BAR GRAPH]

<TABLE>
<CAPTION>
                                              1 YEAR    3 YEARS    5 YEARS    10 YEARS
                                              ------    -------    -------    --------
<S>                                            <C>        <C>        <C>        <C>
PRIME PORTFOLIO                                 5.5%       4.6%       4.4%       6.0%
LIPPER NON-GOVERNMENT MONEY MARKET AVERAGE      5.1%       4.2%       4.0%       5.6%
</TABLE>

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

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


                                       12
<PAGE>   17
SHARE PRICE

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

DIVIDENDS AND TAXES

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

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

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

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

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

THE FUNDS AND VANGUARD

Vanguard Treasury Fund and Vanguard Money Market Reserves are members of The
Vanguard Group, a family of more than 30 investment companies with more than 90
distinct investment portfolios and total net assets of more than $230 billion.
All of the Vanguard Funds share in the expenses associated with business
operations, such as personnel, office space, equipment, and advertising.

  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.

                                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
  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.

                                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.

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. Annual meetings will not be held by
the Funds except as required by the Investment Company Act of 1940. A meeting
will be scheduled (for example, to vote on the removal of a director or
trustee) if the holders of at least 10% of the fund's shares request a meeting
in writing.


                                       14
<PAGE>   19
Investor Information 1-800-662-7447                  Tele-Account 1-800-662-6273
                         Client Services 1-800-662-2739


Investing with Vanguard

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

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

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

Services and Account Features

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

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

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

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

VANGUARD AUTOMATIC EXCHANGE Automatic method for moving a fixed amount of money 
SERVICE                     from one Vanguard Fund account to another.*
[Book Graphic]

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

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

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

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

                                       15
<PAGE>   20
Investor Information 1-800-662-7447                  Tele-Account 1-800-662-6273
                         Client Services 1-800-662-2739

Types of Accounts

INDIVIDUAL OR OTHER ENTITY

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

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

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

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

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

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

RETIREMENT

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

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

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

                                       16
<PAGE>   21
Investor Information 1-800-662-7447                  Tele-Account 1-800-662-6273
                         Client Services 1-800-662-2739


Types of Accounts (continued)

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

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

Distribution Options

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

REINVESTMENT                     Dividends are automatically reinvested in 
                                 additional shares of the Portfolio.

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

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

Buying Shares

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

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


<TABLE>
<CAPTION>
                                  OPEN A NEW ACCOUNT                   ADD TO AN EXISTING ACCOUNT
- -------------------------------------------------------------------------------------------------------
<S>                               <C>                                  <C>
MINIMUM INVESTMENT                $3,000 (regular account); $1,000     $100 by mail or exchange; $1,000 
                                  (IRAs and custodial accounts for     by wire.
                                  minors).
- -------------------------------------------------------------------------------------------------------
BY MAIL                           Complete and sign the application   Mail your check with an         
[Envelope Graphic]                form.                               Invest-By-Mail form detached    
                                                                      from your confirmation statement
FIRST-CLASS mail to:                                                  to the address listed on the    
The Vanguard Group                                                    form.                           
P.O. Box 2600                                                         
Valley Forge, PA 19482            Make your check payable to:         Make your check payable to:
                                  The Vanguard Group-(appropriate     The Vanguard Group-(appropriate
EXPRESS or REGISTERED mail to:    Portfolio number; see below).       Portfolio number; see below).  
The Vanguard Group                Treasury Money Market      50       Treasury Money Market      50  
455 Devon Park Drive              Federal                    33       Federal                    33  
Wayne, PA 19087                   Prime                      30       Prime                      30  

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

                                       17
<PAGE>   22
Investor Information 1-800-662-7447                  Tele-Account 1-800-662-6273
                         Client Services 1-800-662-2739


Buying Shares (continued)

If Vanguard receives your check by 4:00 p.m. Eastern time (the close of trading
on the New York Stock Exchange), your investment is converted to Federal funds
the following business day, and you begin earning dividends the next calendar
day. (For instance, if we received your check before 4:00 p.m. on a Thursday,
your account would be credited Friday, and you would begin earning dividends
Saturday.)

         If the check arrives after 4:00 p.m. Eastern time, your account is
credited after two business days, and you begin earning dividends the calendar
day after that. (If we received your check after 4:00 p.m. on a Thursday, your
account would be credited Monday, and you would begin earning dividends
Tuesday.)

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

<TABLE>
<CAPTION>
                                  OPEN A NEW ACCOUNT                   ADD TO AN EXISTING ACCOUNT
- ----------------------------------------------------------------------------------------------------------
<S>                               <C>                                  <C>
BY TELEPHONE                      Call Vanguard Tele-Account* 24       Call Vanguard Tele-Account* 24     
[Phone Graphic]                   hours a day--or Client Services      hours a day--or Client Services    
1-800-662-6273                    during business hours--to exchange   during business hours--to exchange 
Vanguard Tele-Account(R)          from another Vanguard Fund account   from another Vanguard Fund account 
1-800-662-2739                    with the same registration (name,    with the same registration (name,  
Client Services                   address, taxpayer I.D., and account  address, taxpayer I.D., and account
                                  type).                               type).                             
                                                                       
                                                                       Use Vanguard Fund Express (see     
                                                                       "Services and Account Features") to
                                                                       transfer assets from your bank     
                                                                       account. Call Client Services      
                                                                       before your first use to verify    
                                                                       that this option is in place.      

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

If you buy Portfolio shares through an exchange from another Vanguard Fund by
4:00 p.m. Eastern time, your investment does not have to be converted to Federal
funds, and you begin earning dividends the next calendar day.

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

<TABLE>
<CAPTION>
                                  OPEN A NEW ACCOUNT                   ADD TO AN EXISTING ACCOUNT
- ----------------------------------------------------------------------------------------------------------
<S>                               <C>                                  <C>
BY WIRE                           Call Client Services to arrange      Call Client Services to arrange
[Wire Graphic]                    your wire transactions.              your wire transactions.        
Wire to:                          
CoreStates Bank, N.A.             Wire transactions are not available  Wire transactions are not available
ABA 031000011                     for retirement accounts.             for retirement accounts.           
CoreStates No 01019897
[Temporary Account Number]    
Vanguard Treasury Fund OR     
Vanguard Money Market Reserves
[Portfolio Name]                                                                                     
[Account Registration]        
Attn Vanguard                 
</TABLE>

                                       18
<PAGE>   23
Investor Information 1-800-662-7447                  Tele-Account 1-800-662-6273
                         Client Services 1-800-662-2739

Buying Shares (continued)

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

<TABLE>
<CAPTION>
                          OPEN A NEW ACCOUNT        ADD TO AN EXISTING ACCOUNT
- ---------------------------------------------------------------------------------------
<S>                       <C>                       <C>
AUTOMATICALLY                                       Vanguard offers a variety of ways 
                                                    that you can add to your account 
                                                    automatically. See "Services and 
                                                    Account Features."
</TABLE>

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

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

Redeeming Shares

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

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

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

         - Portfolio name.

         - 10-digit account number.

         - Name and address exactly as registered on that account.

         - Social Security or Employer Identification number as registered on
that account.

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

         If we follow reasonable security procedures, neither the Portfolio nor
Vanguard will be responsible for the authenticity of transaction instructions
received by telephone. We believe that these procedures are reasonable and that,
if we follow them, you bear the risk of any losses resulting from unauthorized
or fraudulent telephone transactions on your account. However, if we do not
follow these or other reasonable procedures, Vanguard may be liable for any
losses resulting from unauthorized or fraudulent transactions. 

HOW TO SELL SHARES 

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

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

                                       19
<PAGE>   24
Investor Information 1-800-662-7447                  Tele-Account 1-800-662-6273
                         Client Services 1-800-662-2739

Redeeming Shares (continued)

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

         - Portfolio name and account number.

         - Amount of the transaction (in dollars).

         - Signatures of all owners exactly as registered on the account.

         - Signature guarantees (if required).

         - Any supporting legal documentation that may be required.

         - Any certificates you are holding for the account.

         Sales or exchange requests received after the close of trading on the
New York Stock Exchange (generally 4:00 p.m. Eastern time) are processed the
next business day.

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

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

HOW TO EXCHANGE SHARES

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

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

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

<TABLE>
<CAPTION>
SELLING OR EXCHANGING SHARES      ACCOUNT TYPE
- --------------------------------------------------------------------------------
<S>                               <C>
BY TELEPHONE                      ALL TYPES EXCEPT RETIREMENT:
[Telephone Graphic]
1-800-662-6273                    Call Vanguard Tele-Account* 24 hours a day--or
Vanguard Tele-Account             Client Services during business hours--to sell
1-800-662-2739                    or exchange shares. You can exchange shares
Client Services                   from any of these Portfolios to open an
                                  account in another Vanguard Fund or to add to
                                  an existing Vanguard Fund account with an
                                  identical registration.

                                  RETIREMENT:

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

                                  *You must obtain a Personal Identification
                                  Number through Tele-Account at least seven
                                  days before you request your first redemption.
- --------------------------------------------------------------------------------
BY CHECK                          ALL TYPES EXCEPT RETIREMENT:

                                  You can sell shares by writing a check for
                                  $250 or more.

                                  RETIREMENT:

                                  Checkwriting is not available for retirement
                                  accounts.
</TABLE>

                                       20
<PAGE>   25
Investor Information 1-800-662-7447                  Tele-Account 1-800-662-6273
                         Client Services 1-800-662-2739

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

                                     Vanguard offers several ways to sell or
                                     exchange shares automatically (see
                                     "Services and Account Features"). Call
                                     Investor Information for the appropriate
                                     booklet and application if you did not
                                     elect a feature when you opened your
                                     account.
</TABLE>

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

                         A NOTE ON UNUSUAL CIRCUMSTANCES

Vanguard reserves the right to revise or terminate the telephone redemption
privilege at any time, without notice. In addition, Vanguard can stop selling
shares or postpone payment at times when the New York Stock Exchange is closed
or under any emergency circumstances as determined by the United States
Securities and Exchange Commission. If you experience difficulty making a
telephone redemption during periods of drastic economic or market change, you
can send us your request by regular or express mail. Follow the instructions on
selling or exchanging shares by mail in the "Redeeming Shares" section.

Fund and Account Updates

STATEMENTS AND REPORTS

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

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

                                       21
<PAGE>   26
Investor Information 1-800-662-7447                  Tele-Account 1-800-662-6273
                         Client Services 1-800-662-2739


Fund and Account Updates (continued)

CONFIRMATION STATEMENT               Sent each time you buy, sell or exchange
                                     shares; confirms the date and the amount
                                     of the transaction.
                                                                               
PORTFOLIO SUMMARY                    Mailed quarterly; shows the market value
                                     of your account at the close of the
                                     statement period, as well as distributions,
                                     purchases, sales, and exchanges for the
                                     current calendar year.
                                                                               
FUND FINANCIAL REPORTS               Mailed in January and July for these 
                                     Portfolios.
                                                                               
TAX STATEMENTS                       Generally mailed in January; report
                                     previous year's dividend distributions
                                     as well as distributions from IRAs or
                                     other retirement accounts.

AUTOMATED TELEPHONE ACCESS

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

COMPUTER ACCESS

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

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

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 FUNDS INTEND TO MAINTAIN SUCH REGISTRATION.

                                       22

<PAGE>   27
GLOSSARY OF INVESTMENT TERMS

CASH RESERVES
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>   28
[THE VANGUARD GROUP LOGO]

Post Office Box 2600
Valley Forge, PA 19482

<TABLE>
<S>                                <C>                                <C>

INVESTMENT INFORMATION             VANGUARD BROKERAGE                 ELECTRONIC ACCESS TO THE
DEPARTMENT                         SERVICES                           VANGUARD MUTUAL FUND
1-800-662-7447 (SHIP)              1-800-992-8327                     EDUCATION AND INFORMATION
TEXT TELEPHONE:                    For information on trading         CENTER
1-800-952-3335                     stocks, bonds, and options         On America Online(R)
For information on our Funds,      at reduced commissions             Keyword:vanguard
Funds services and retirement
accounts, requests for             VANGUARD TELE-ACCOUNT(R)           On the World-Wide Web
literature.                        1-800-662-6273 (ON-BOARD)          http://www.vanguard.com
                                   For 24-hour automated access   
CLIENT SERVICES DEPARTMENT         to price and yield information     To send e-mail to Vanguard
1-800-662-2739 (CREW)              to your account, certain           [email protected]
TEXT TELEPHONE:                    transactions.
1-800-662-2738
For information on your
account, account transactions,
account statements.
</TABLE>


(C)1996 Vanguard Marketing
Corporation, Distributor

P030N


<PAGE>   29
 
                                     PART B
 
                             VANGUARD TREASURY FUND
 
                      STATEMENT OF ADDITIONAL INFORMATION
 
                                DECEMBER 2, 1996
 
     This Statement is not a prospectus but should be read in conjunction with
the Fund's current Prospectus (dated December 1, 1996). 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>   30
 
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>   31
 
      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>   32
 
                             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>   33
 
                               PURCHASE OF SHARES
 
     The Fund reserves the right in its sole discretion (i) to suspend the
offerings of its shares, (ii) to reject purchase orders when in the judgment of
management such rejection is in the best interest of the Fund, and (iii) to
reduce or waive the minimum investment for or any other restrictions on initial
and subsequent investments for certain fiduciary accounts or under circumstances
where certain economies can be achieved in sales of the Fund's shares.
 
                              REDEMPTION OF SHARES
 
     The Fund may suspend redemption privileges for the Portfolio or postpone
the date of payment (i) during any period that the New York Stock Exchange is
closed, or trading on the Exchange is restricted as determined by the Securities
and Exchange Commission (the "Commission"), (ii) during any period when an
emergency exists as defined by the rules of the Commission as a result of which
it is not reasonably practicable for the Portfolio to dispose of securities
owned by it, or fairly to determine the value of its assets, and (iii) for such
other periods as the Commission may permit.
 
     The Fund will make an election with the Commission to pay in cash all
redemptions requested by any shareholder of record limited in amount during any
90-day period to the lesser of $250,000 or l% of the net assets of the Fund at
the beginning of such period. Such commitment is irrevocable without the prior
approval of the Commission. Redemptions in excess of the above limits may be
paid in whole or in part, in investment readily marketable securities or in
cash, as the Trustees may deem advisable; however, payment will be made wholly
in cash unless the Trustees believe that economic or market conditions exist
which would make such a practice detrimental to the best interests of the Fund.
If redemptions are paid in investment securities, such securities will be valued
as set forth in the Prospectus under "The Share Price of the Portfolio" and a
redeeming shareholder would normally incur brokerage expenses if he converted
these securities to cash.
 
     No charge is made by the Fund for redemptions; except for wire withdrawals
in amounts less than $5,000 which will be subject to a maximum charge of $5.00
which will be deducted from the principal in your account. Any redemption may be
more or less than the shareholder's cost depending on the market value of the
securities held by each Portfolio.
 
                              SHAREHOLDER SERVICES
 
     EXCHANGE PRIVILEGE  The Portfolio's shares may be exchanged without cost
for shares of any open-end Fund currently offering its shares to new investors
in The Vanguard Group ("Vanguard"). A shareholder of any other open-end Fund in
Vanguard may likewise exchange his shares for shares of the Portfolio. Exchange
requests may be made either by mail, telephone or telegraph.
 
     Telephone and telegraph exchanges (referred to as "expedited exchanges")
will be accepted only if the registration of the two accounts is identical.
Requests for expedited exchanges received prior to the close of the New York
Stock Exchange (generally 4:00 P.M. Eastern time) will be processed at the next
determined net asset value after such request is received. Requests received
after the close of the New York Stock Exchange (generally 4:00 P.M. Eastern
time), will be processed on the next business day. NO EXPEDITED EXCHANGES WILL
BE ACCEPTED INTO, OR FROM, VANGUARD BALANCED INDEX FUND, VANGUARD INDEX TRUST,
VANGUARD QUANTITATIVE PORTFOLIOS AND VANGUARD INTERNATIONAL EQUITY INDEX FUND.
Neither the Fund nor Vanguard will be responsible for the authenticity of
exchange instructions received by telephone or telegraph. Expedited exchanges
may also be subject to limitations as to amounts and frequency, and to other
restrictions established by the Board of Trustees to assure that such exchanges
do not disadvantage the Fund and its shareholders. Shareholders may obtain the
terms of these limitations, which may be revised at any time, from Vanguard.
 
     Any such exchange will be based on the respective net asset values of the
shares involved. There are no sales commissions or charges of any kind. Before
making an exchange, a shareholder should consider the investment objectives and
policies of the Portfolio or Fund to be purchased, and other relevant
information (including the minimum initial investment), which can be found in
the prospectus relating to that particular Portfolio or Fund. A prospectus for
any of the Vanguard Funds or Portfolios may be obtained from Vanguard.
 
                                        5
<PAGE>   34
 
     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(@) 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>   35
 
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>   36
 
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>   37
 
                             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>   38
 
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>   39
 
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>   40
 
                    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


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