VANGUARD ASSET ALLOCATION FUND INC
497, 1994-01-04
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<PAGE>   1
 
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                   FORM N-1A
                  REGISTRATION STATEMENT (NO. 33-23444) UNDER
                           THE SECURITIES ACT OF 1933
                          PRE-EFFECTIVE AMENDMENT NO.                        /X/
                         POST-EFFECTIVE AMENDMENT NO. 8                      /X/
                                      AND
 
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                  ACT OF 1940
                                AMENDMENT NO. 9                              /X/
 
                      VANGUARD ASSET ALLOCATION FUND, INC.
               (EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)
                     P.O. BOX 2600, VALLEY FORGE, PA 19482
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE)
 
                  REGISTRANT'S TELEPHONE NUMBER (215) 669-1000
 
                         RAYMOND J. KLAPINSKY, ESQUIRE
                                  P.O. BOX 876
                             VALLEY FORGE, PA 19482
 
                IT IS PROPOSED THAT THIS FILING BECOME EFFECTIVE
          60 days after filing, pursuant to paragraph (b) of Rule 485
 (acceleration of the effective date to December 31, 1993 has been requested).
 
                 APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING:
  As soon as practicable after this Registration Statement becomes effective.
 
     REGISTRANT ELECTS TO REGISTER AN INDEFINITE NUMBER OF SHARES PURSUANT TO
REGULATION 24F-2 UNDER THE INVESTMENT COMPANY ACT OF 1940. REGISTRANT FILED ITS
RULE 24(F )(2) FOR THE YEAR ENDED SEPTEMBER 30, 1993, ON NOVEMBER 12, 1993.
 
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<PAGE>   2
 
                      VANGUARD ASSET ALLOCATION FUND, INC.
 
                             CROSS REFERENCE SHEET
<TABLE>
<CAPTION>
 FORM N-1A
ITEM NUMBER                                                           LOCATION IN PROSPECTUS
<C>           <S>                                              <C>
    Item 1.   Cover Page....................................   Cover Page
    Item 2.   Synopsis......................................   Not Applicable
    Item 3.   Condensed Financial Information...............   Financial Highlights; Performance
                                                               Record
    Item 4.   General Description of Registrant.............   Investment Objective; Investment
                                                               Policies, Investment Risks;
                                                               Investment Limitations; General
                                                               Information
    Item 5.   Management of the Fund........................   Management of the Fund; Investment
                                                               Adviser
    Item 6.   Capital Stock and Other Securities............   Opening an Account and Purchasing
                                                               Shares; Selling Your Shares; The
                                                               Fund's Share Price; Dividends,
                                                               Capital Gains 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 Your 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...............   Management of the Fund
   Item 13.   Investment Objective and Policies.............   Investment Limitations; Description
                                                               of U.S. Government Securities;
                                                               Description of Repurchase Agreements;
                                                               Futures Contracts
   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; Investment
                                                               Advisory Services
   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....................................   Not Applicable
   Item 21.   Underwriters..................................   Not Applicable
   Item 22.   Calculations of Yield Quotations of Money
              Market Fund...................................   Not Applicable
   Item 23.   Financial Statements..........................   Financial Statements
</TABLE>
<PAGE>   3
 
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[LOGO]
                                                  A Member of The Vanguard Group
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PROSPECTUS--DECEMBER 31, 1993
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NEW ACCOUNT INFORMATION: INVESTOR INFORMATION DEPARTMENT--1-800-662-7447 (SHIP)
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SHAREHOLDER ACCOUNT SERVICES: CLIENT SERVICES DEPARTMENT--1-800-662-2739 (CREW)
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<TABLE>
<S>                       <C>
INVESTMENT                Vanguard Asset Allocation Fund, Inc. (the "Fund") is an open-end
OBJECTIVE AND             diversified investment company that seeks to maximize total return
POLICIES                  (i.e., capital change plus income). The Fund invests in common stocks,
                          bonds and money market instruments in proportions consistent with their
                          expected returns and risks as evaluated by the Fund's adviser. The Fund
                          should not be considered a complete investment program. There is no
                          assurance that the Fund will achieve its stated objective.
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OPENING AN                Please complete and return the Account Registration Form. If you need
ACCOUNT                   assistance in completing this Form, please call our Investor Information
                          Department. The minimum initial investment is $3,000 ($500 for
                          Individual Retirement Accounts and Uniform Gifts/Transfers to Minors Act
                          accounts). The Fund is offered on a no-load basis
                          (i.e., there are no sales commissions or 12b-1 fees). However, the Fund
                          incurs expenses for investment advisory, management, administrative and
                          distribution services.
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ABOUT THIS                This Prospectus is designed to set forth concisely the information you
PROSPECTUS                should know about the Fund before you invest. It should be retained for
                          future reference. A "Statement of Additional Information" containing
                          additional information about the Fund has been filed with the Securities
                          and Exchange Commission. Such Statement is dated December 31, 1993 and
                          has been incorporated by reference into this Prospectus. A copy may be
                          obtained without charge by writing to the Fund or by calling the
                          Investor Information Department.
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</TABLE>
 
TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                 Page      
<S>                              <C>       
Fund Expenses..................    2
Financial Highlights...........    2
Yield and Total Return.........    3
          FUND INFORMATION
Investment Objective...........    4
Investment Policies............    4
Investment Risks...............    5
Who Should Invest..............    6
</TABLE>
 
<TABLE>
<S>                              <C>       
Implementation of Policies.....    7
Investment Limitations.........    9
Management of the Fund.........    9
Investment Adviser.............   10
Performance Record.............   11
Dividends, Capital Gains and
  Taxes........................   12
The Fund's Share Price.........   13
General Information............   14
          SHAREHOLDER GUIDE
Opening an Account and
  Purchasing Shares............   15
When Your Account Will Be
  Credited.....................   17
Selling Your Shares............   17
Exchanging Your Shares.........   19
Transferring Registration......   21
Other Vanguard Services........   21
</TABLE>
 
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THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE COMMISSION PASSED UPON THE ACCURACY OR
ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
OFFENSE.
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<PAGE>   4
 
<TABLE>
<S>                       <C>
FUND EXPENSES             The following table illustrates all expenses and fees that you would
                          incur as a shareholder of the Fund. The expenses and fees set forth in
                          the table are for the 1993 fiscal year.
</TABLE>
 
<TABLE>
                           <S>                                                                        <C>
                                                   SHAREHOLDER TRANSACTION EXPENSES
                           ---------------------------------------------------------------------------------
                           Sales Load Imposed on Purchases.......................................      None
                           Sales Load Imposed on Reinvested Dividends............................      None
                           Redemption Fees.......................................................      None
                           Exchange Fees.........................................................      None
                                                    ANNUAL FUND OPERATING EXPENSES
                           ---------------------------------------------------------------------------------
                           Management & Administrative...........................................      0.27%
                           Investment Advisory Fees..............................................      0.17
                           12b-1 Fees............................................................      None
                           Other Expenses
                             Distribution Costs..................................................      0.02%
                             Miscellaneous Expenses..............................................      0.03
                                                                                                       ----
                           Total Other Expenses..................................................      0.05
                                                                                                       ----
                                    TOTAL OPERATING EXPENSES.....................................      0.49%
                                                                                                       ----
                                                                                                       ----
</TABLE>
 
<TABLE>
<S>                       <C>
                          The purpose of this table is to assist you in understanding the various
                          costs and expenses that you would bear directly or indirectly as an
                          investor in the Fund.
                          The following example illustrates the expenses that you would incur on a
                          $1,000 investment over various periods, assuming (1) a 5% annual rate of
                          return and (2) redemption at the end of each period. As noted in the
                          table above, the Fund charges no redemption fees of any kind.
</TABLE>
 
<TABLE>
<CAPTION>
                                       
                                1 YEAR       3 YEARS       5 YEARS       10 YEARS
                                ------       -------       -------       --------
                                <S>          <C>           <C>           <C>
                                 $  5         $  16         $  27          $ 62
</TABLE>
 
<TABLE>
<S>                       <C>
                          THIS EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE
                          EXPENSES OR PERFORMANCE. ACTUAL EXPENSES MAY BE HIGHER OR LOWER THAN
                          THOSE SHOWN.
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FINANCIAL HIGHLIGHTS      The following financial highlights information for a share outstanding
                          throughout each period, has been audited by Price Waterhouse,
                          independent accountants, whose report thereon was unqualified. This
                          information should be read in conjunction with the financial statements
                          and notes thereto, which are incorporated by reference in the Statement
                          of Additional Information and this Prospectus, and which appear, along
                          with the report of Price Waterhouse, in the Fund's 1993 Annual Report to
                          Shareholders. For a more complete discussion of the Fund's performance,
                          please see the Fund's 1993 Annual Report to Shareholders, which may be
                          obtained without charge.
</TABLE>
 
                                        2
<PAGE>   5
 
<TABLE>
<CAPTION>
                                                                        YEAR ENDED SEPTEMBER 30,
                                                                   -----------------------------------         NOV. 3, 1988+ TO
                                                                  1993       1992       1991       1990         SEP. 30, 1989
<S>                                                              <C>        <C>        <C>        <C>         <C>
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NET ASSET VALUE, BEGINNING OF PERIOD...........................  $13.79     $13.06     $10.93     $12.11            $10.00
                                                                 ------     ------     ------     ------      ------------
INVESTMENT OPERATIONS
  Net Investment Income........................................     .54        .61        .60        .60               .46
  Net Realized and Unrealized Gain (Loss) on Investments.......    1.51        .90       2.28      (1.12)             1.90
                                                                 ------     ------     ------     ------      ------------
    TOTAL FROM INVESTMENT OPERATIONS...........................    2.05       1.51       2.88       (.52)             2.36
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DISTRIBUTIONS
  Dividends from Net Investment Income.........................    (.59)      (.59)      (.62)      (.51)             (.25)
  Distributions from Realized Capital Gains....................    (.17)      (.19)      (.13)      (.15)               --
                                                                 ------     ------     ------     ------      ------------
    TOTAL DISTRIBUTIONS........................................    (.76)      (.78)      (.75)      (.66)             (.25)
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NET ASSET VALUE, END OF PERIOD.................................  $15.08     $13.79     $13.06     $10.93            $12.11
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TOTAL RETURN...................................................   15.41%     12.16%     27.32%     (4.57)%           23.93%
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RATIO/SUPPLEMENTAL DATA
Net Assets, End of Period (Millions)...........................  $1,003       $502       $265       $160              $107
Ratio of Expenses to Average Net Assets........................     .49%       .52%       .44%       .50%              .49%*
Ratio of Net Investment Income to Average Net Assets...........    4.07%      4.95%      5.28%      5.53%             5.53%*
Portfolio Turnover Rate........................................      31%        18%        44%        12%               52%
</TABLE>
 
*Annualized.
+Commencement of operations.
 
<TABLE>
<S>                       <C>
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YIELD AND TOTAL           From time to time the Fund may advertise its yield and total return.
RETURN                    Both yield and total return figures are based on historical earnings and
                          are not intended to indicate future performance. The "total return" of
                          the Fund refers to the average annual compounded rates of return over
                          one, five and ten-year periods or for the life of the Fund (which
                          periods will be stated in the advertisement) that would equate an
                          initial amount invested at the beginning of a stated period to the
                          ending redeemable value of the investment, assuming the reinvestment of
                          all dividend and capital gains distributions.
                          The "30-day yield" of the Fund is calculated by dividing the net
                          investment income per share earned during a 30-day period by the net
                          asset value per share on the last day of the period. Net investment
                          income includes interest and dividend income earned on the Fund's
                          securities; it is net of all expenses and all recurring and nonrecurring
                          charges that have been applied to all shareholder accounts. The yield
                          calculation assumes that the net investment income earned over thirty
                          days is compounded monthly for six months and then annualized. Methods
                          used to calculate advertised yields are standardized for all stock and
                          bond mutual funds. However, these methods differ from the accounting
                          methods used by the Fund to maintain its books and records, and so the
                          advertised thirty-day yield may not fully reflect the income paid to
                          your own account or the yield reported in the Fund's financial
                          statements. Additionally, the Fund may compare its performance to that
                          of the Standard & Poor's 500 Composite Stock Price Index.
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</TABLE>
 
                                        3
<PAGE>   6
<TABLE>
<S>                       <C>
INVESTMENT                The objective of the Fund is to maximize total return (i.e., capital
OBJECTIVE                 change plus income) while exhibiting less investment risk than a
                          portfolio consisting entirely of common stocks. There is no assurance
THE FUND SEEKS TO         that the Fund will achieve its stated objective.
MAXIMIZE TOTAL RETURN
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INVESTMENT                The Fund will allocate its assets among a common stock portfolio, a bond
POLICIES                  portfolio, and money market instruments. The Fund's adviser, Mellon
                          Capital Management, allocates the Fund's assets among stocks, bonds and
THE FUND INVESTS IN       money market instruments in proportions which reflect the anticipated
STOCKS, BONDS AND         returns and risks of each asset class. The estimates of return and risk
MONEY MARKET              are developed based upon the adviser's disciplined valuation
INSTRUMENTS IN            methodology. There are no limitations on the amount of the Fund's assets
VARYING                   which may be allocated to each of the three asset classes (stocks, bonds
PROPORTIONS               and money market instruments). The Fund is managed without regard to tax
                          ramifications.
                          In estimating the relative attractiveness of each asset class, the
                          adviser takes into account various factors. Common stocks are evaluated
                          using a "dividend-discount" model. This model provides an estimate of
                          the expected return of the Standard & Poor's 500 Composite Stock Price
                          Index (the "S&P 500 Index") based upon earnings forecasts for companies
                          whose stocks are included in the S&P 500 Index. The expected bond return
                          is the current yield-to-maturity of long-term U.S. Treasury bonds, while
                          the return on money market instruments reflects the current yield on
                          three-month U.S. Treasury bills and long-term inflation forecasts.
                          Once expected return and volatility (risk) estimates are developed for
                          each asset class, the adviser attempts to identify apparent imbalances
                          in the relative pricing of common stocks, bonds and money market
                          instruments, using a computer model. Implicit in the adviser's approach
                          is the belief that such short-term imbalances occur periodically but
                          tend to be corrected fairly quickly. The Fund's allocation among the
                          three asset classes is then structured to take advantage of these
                          perceived imbalances.
                          To implement a particular allocation strategy, the Fund may invest in
                          the following securities: a diversified portfolio of common stocks
                          selected by the adviser to parallel the performance of the S&P 500
                          Index; long-term U.S. Treasury bonds with maturities generally in excess
                          of 20 years; and selected money market instruments, including repurchase
                          agreements. The Fund may also invest in futures contracts on stock
                          indexes and bonds. See "Implementation of Policies" for a description of
                          the securities in which the Fund invests and other investment practices
                          of the Fund.
                          The investment objective and policies of the Fund are not fundamental
                          and so may be changed by the Board of Directors without shareholder
                          approval. However, shareholders would be notified prior to a material
                          change in either.
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</TABLE>
 
                                        4
<PAGE>   7
<TABLE>
<S>                       <C>
INVESTMENT RISKS          Depending on the adviser's allocation of the Fund's assets among stocks,
                          bonds and cash reserves, investors in the Fund may be exposed to the market
THE FUND IS SUBJECT       risk of common stocks and bonds.
TO STOCK AND BOND         Stock market risk is the possibility that stock prices in general will
MARKET RISK               decline over short or even extended periods. The stock market tends to be cyclical,
                          with periods when stock prices generally rise and periods when stock prices generally
                          decline.  To illustrate the volatility of domestic stock prices, the following
                          table sets forth the extremes for U.S. stock market returns as well as the average return
                          for the period from 1926 to 1992, as measured by the Standard & Poor's 500
                          Composite Stock Price Index:
</TABLE>
 
<TABLE>
<CAPTION>
                                  AVERAGE ANNUAL U.S. STOCK MARKET RETURNS (1926-1992)
                                               OVER VARIOUS TIME HORIZONS
                                            1 YEAR     5 YEARS     10 YEARS     20 YEARS
                                            ------     -------     --------     --------
                                <S>         <C>        <C>         <C>          <C>
                                Best        +53.9%      +23.9%       +20.1%       +16.9%
                                Worst       -43.3       -12.5        - 0.9        + 3.1
                                Average     +12.2       +10.1        +10.4        +10.4
</TABLE>
 
<TABLE>
<S>                       <C>
                          As shown, from 1926 to 1992, U.S. common stocks as measured by the Index
                          have provided an average annual total return (capital appreciation plus
                          dividend income) of +12.2%. While this average return can be used as a
                          guide for setting reasonable expectations for future stock market
                          returns, it may not be useful for forecasting future returns in any
                          particular period, as stock returns are quite volatile from year to
                          year.
                          Bond market risk is the potential for fluctuations in the market value
                          of bonds. Bond prices vary inversely with changes in the level of
                          interest rates. When interest rates rise, the prices of bonds fall;
                          conversely, when interest rates fall, bond prices rise. While bonds
                          normally fluctuate less in price than stocks, there have been extended
                          periods of cyclical increases in interest rates that have caused
                          significant declines in bond prices. For example, long-term bond prices
                          fell 48% from December 1976 to September 1981. The risk of bonds
                          declining in value, however, may be offset in whole or in part by the
                          higher level of income that bonds provide.
                          While the Fund invests in stocks, bonds and money market instruments in
                          varying proportions, investors should not construe the Fund as a
                          balanced investment program offering relatively stable allocations among
                          these asset classes. Because the allocation strategy of the adviser may,
                          at certain times, result in a portfolio with a primary emphasis on
                          common stocks, the Fund may from time to time exhibit a level of
                          volatility which is more consistent with a common stock portfolio than a
                          balanced portfolio. However, under normal circumstances, the volatility
                          of the Fund's total return is expected to be less than that of a common
                          stock portfolio, as represented, for example, by the S&P 500 Index.
THE ADVISER MAY FAIL      Investors should also be aware that the investment results of the Fund
TO ANTICIPATE MARKET      depend upon the adviser's ability to anticipate correctly the relative
ADVANCES OR DECLINES      performance and risk of stocks, bonds and money market instruments.
                          Historical evidence indicates that
</TABLE>
 
                                        5
<PAGE>   8
<TABLE>
<S>                       <C>
                          correctly timing portfolio allocations among these asset classes has
                          been an extremely difficult strategy to implement successfully. While
                          the adviser has substantial experience in asset allocation, there can be
                          no assurance that the adviser will correctly anticipate relative asset
                          class performance in the future on a consistent basis. The Fund's
                          investment results would suffer, for example, if only a small portion of
                          the Fund's assets were allocated to stocks during a significant stock
                          market advance, or if a major portion of its assets were allocated to
                          stocks during a market decline. Similarly, the Fund's performance could
                          deteriorate if the Fund were substantially invested in bonds at a time
                          when interest rates moved adversely.
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WHO SHOULD INVEST         The Fund is designed for investors seeking maximum total return through
                          an investment vehicle which provides an actively managed mix of stocks,
LONG-TERM INVESTORS       bonds and money market instruments. Because the Fund can and may have a
SEEKING MAXIMUM           large percentage of its portfolio invested in common stocks, investors
TOTAL RETURN              in the Fund should be willing to accept the risk of an all-stock
                          portfolio, including the potential for sudden, sometimes substantial
                          declines in market value.
                          Due to the risks associated with common stock and bond investments, the
                          Fund is intended to be a long-term investment vehicle and is not
                          designed to provide investors with a means of speculating on short-term
                          stock and bond market movements. Investors who engage in excessive
                          account activity generate additional costs which are borne by all of the
                          Fund's shareholders. In order to minimize such costs the Fund has
                          adopted the following policies. The Fund reserves the right to reject
                          any purchase request (including exchange purchases from other Vanguard
                          portfolios) that is reasonably deemed to be disruptive to efficient
                          portfolio management. Additionally, the Fund has adopted exchange
                          privilege limitations as described in the section "Exchange Privilege
                          Limitations." Finally, the Fund reserves the right to suspend the
                          offering of its shares.
                          No assurance can be given that the Fund will achieve its objective or
                          that shareholders will be protected from the risk of loss that is
                          inherent in equity investing. Also, there can be no guarantee that the
                          adviser will correctly anticipate fluctuations in the stock and bond
                          markets in its effort to maximize total return while minimizing risk.
                          The Fund should be considered part of a well-rounded investment program
                          and not its sole component. Investors may wish to reduce the potential
                          risk of investing in the Fund by purchasing shares on a regular,
                          periodic basis (dollar-cost averaging) rather than making an investment
                          in one lump sum.
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</TABLE>
 
                                        6
<PAGE>   9
 
<TABLE>
<S>                       <C>
IMPLEMENTATION OF         In an effort to maximize its total investment return, the Fund utilizes
POLICIES                  a number of investment practices.
THE FUND MAY INVEST IN    The Fund invests in stocks, bonds and money market instruments in
STOCKS, BONDS AND         varying proportions. For common stocks, the Fund will invest in a
MONEY MARKET              diversified portfolio of common stocks selected to parallel the
INSTRUMENTS               investment performance of the S&P 500 Index. The Fund may also invest in
                          stock index futures and options to a limited extent, as described below.
                          Bond investments for the Fund will consist of long-term U.S. Treasury
                          bonds (those with maturities generally in excess of 20 years) and, as
                          described below, futures contracts and options on such bonds. As part of
                          its bond portfolio, the Fund may also invest in other long-term "full
                          faith and credit" obligations of the U.S. Government.
                          The money market instruments held by the Fund will have an average
                          weighted maturity of less than 90 days. Money market instruments may
                          include obligations of the United States Government and its agencies and
                          instrumentalities; commercial paper, bank certificates of deposit, and
                          bankers' acceptances; and repurchase agreements collateralized by these
                          securities.
                          A repurchase agreement is a means of investing monies for a short
                          period. In a repurchase agreement, a seller--a U.S. commercial bank or
                          recognized U.S. securities dealer--sells securities to the Fund and
                          agrees to repurchase the securities at the Fund's cost plus interest
                          within a specified period (normally one day). In these transactions, the
                          securities purchased by the Fund will have a total value equal to or in
                          excess of the value of the repurchase agreement, and will be held by the
                          Fund's Custodian Bank until repurchased.
THE FUND MAY              The Fund may utilize stock and bond futures contracts and options to a
USE FUTURES CONTRACTS     limited extent. Specifically, the Fund may enter into futures contracts
AND OPTIONS               provided that not more than 5% of its assets are required as a futures
                          contract deposit; in addition, the Fund may enter into futures contracts
                          and options only to the extent that obligations under such contracts or
                          transactions represent not more than 50% of the Fund's assets. However,
                          under unusual circumstances, the Fund may maintain futures positions
                          that are equivalent in value to up to 100% of the Fund's assets, so that
                          the Fund may remain effectively fully invested in proportions consistent
                          with the adviser's current asset allocation strategy.
                          Futures contracts and options may be used for several reasons: to
                          reallocate the Fund's assets among stocks, bonds and money market
                          instruments while minimizing transaction costs; to maintain cash
                          reserves while simulating full investment; to facilitate trading; or to
                          seek higher investment returns when a futures contract is priced more
                          attractively than the underlying security or index.
                          For example, in order to reallocate 10% of the Fund's assets from stocks
                          to bonds while minimizing transaction costs, the adviser may sell stock
                          index futures and purchase bond futures. Because the transaction costs
                          of futures contracts and options may be lower than the costs of
                          investing in stocks or bonds directly, it is 
</TABLE>
 
                                        7

<PAGE>   10
<TABLE>
<S>                       <C>
                          expected that the use of futures contracts and options may reduce the 
                          Fund's total transaction costs. Also, because futures contracts only
                          require a small initial margin deposit, the Fund would then be able to 
                          simultaneously maintain a cash reserve for potential redemptions and 
                          simulate full investment. In the event of net redemptions from the Fund, 
                          sufficient futures contracts would be sold to avoid any leveraging of 
                          the Fund's assets.
FUTURES CONTRACTS AND     The primary risks associated with the use of futures contracts and
OPTIONS POSE CERTAIN      options are: (i) imperfect correlation between the change in market
RISKS                     value of the securities held by the Fund and the prices of futures
                          contracts and options; and (ii) possible lack of a liquid secondary
                          market for a futures contract and the resulting inability to close a
                          futures position prior to its maturity date. The risk of imperfect
                          correlation will be minimized by investing only in those contracts whose
                          behavior is expected to resemble that of the Fund's underlying
                          securities. The risk that the Fund will be unable to close out a futures
                          position will be minimized by entering into such transactions on a
                          national exchange with an active and liquid secondary market. While
                          futures contracts and options can be used as leveraged instruments, the
                          Fund may not use futures contracts or options to leverage its net
                          assets.
                          The risk of loss in trading futures contracts in some strategies can be
                          substantial, due both to the low margin deposits required, and the
                          extremely high degree of leverage involved in futures pricing. As a
                          result, a relatively small price movement in a futures contract may
                          result in immediate and substantial loss (or gain) to the investor. When
                          investing in futures contracts, the Fund will segregate cash or cash
                          equivalents in the amount of the underlying obligation.
THE FUND MAY LEND         The Fund may lend its investment securities to qualified institutional
ITS SECURITIES            investors for either short-term or long-term purposes of realizing
                          additional income. Loans of securities by the Fund will be
                          collateralized by cash, letters of credit, or securities issued or
                          guaranteed by the U.S. Government or its agencies. The collateral will
                          equal at least 100% of the current market value of the loaned
                          securities.
THE FUND MAY BORROW       The Fund may borrow money, subject to the limitations set forth below,
MONEY UNDER UNUSUAL       for temporary or emergency purposes, including the meeting of redemption
CIRCUMSTANCES             requests which might otherwise require the untimely disposition of
                          securities.
PORTFOLIO TURNOVER        Due to the active asset allocation approach employed by the Fund, the
MAY BE HIGH               Fund's portfolio turnover rate may be high, approximately 100% per year.
                          A 100% portfolio turnover rate would occur, for example, if all of the
                          Fund's securities were replaced within one year. Further, in order to
                          comply with the "short-short" test of the Internal Revenue Service, it
                          may be necessary for the Fund to modify its investment strategy and
                          refrain from securities sales that it would otherwise make. Under the
                          IRS's "short-short" test, a mutual fund must not receive more than 30%
                          of its gross income from gains realized on securities held for less than
                          90 days.
- --------------------------------------------------------------------------------------------------
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                                        8

<PAGE>   11
<TABLE>
<S>                       <C>

INVESTMENT                The Fund has adopted certain limitations in an attempt to reduce its
LIMITATIONS               exposure to specific situations. Some of these limitations are that the
                          Fund will not:
THE FUND HAS ADOPTED
CERTAIN FUNDAMENTAL       (a)       with respect to 75% of the value of its total assets,
LIMITATIONS                         purchase the securities of any issuer (except obligations of the
                                    United States government and its instrumentalities) if as a result
                                    the Fund would hold more than 10% of the outstanding voting
                                    securities of the issuer, or more than 5% of the value of the
                                    Fund's total assets would be invested in the securities of
                                    such issuer;
                          (b)       invest more than 25% of its assets in any one industry;
                          (c)       borrow money except from banks (or through reverse repurchase
                                    agreements) for temporary or emergency purposes (not leveraging), and
                                    then only in an amount not in excess of 15% of the value of
                                    the Fund's net assets at the time the borrowing is made.
                                    Whenever borrowing exceeds 5% of the value of the Fund's
                                    assets, the Fund will not make any additional investments; and
                          (d)       pledge, mortgage or hypothecate any of its assets to an
                                    extent greater than 5% of its total assets.
                          These investment limitations are considered at the time investment
                          securities are purchased. The investment limitations described here and
                          in the Statement of Additional Information may be changed only with the
                          approval of a majority of the Fund's shareholders.
- --------------------------------------------------------------------------------------------------
MANAGEMENT OF             The Fund is a member of The Vanguard Group of Investment Companies, a
THE FUND                  family of 32 investment companies with 77 distinct investment portfolios
                          and total assets in excess of $120 billion. Through their jointly-owned
VANGUARD                  subsidiary, The Vanguard Group, Inc. ("Vanguard"), the Fund and the
ADMINISTERS AND           other funds in the Group obtain at cost virtually all of their corporate
DISTRIBUTES THE           management, administrative and distribution services. Vanguard also
FUND                      provides investment advisory services on an at-cost basis to certain
                          Vanguard funds. As a result of Vanguard's unique corporate structure,
                          the Vanguard funds have costs substantially lower than those of most
                          competing mutual funds. In 1992, the average expense ratio (annual costs
                          including advisory fees divided by average net assets) for the Vanguard
                          Funds amounted to .31% compared to an average of 1.03% for the mutual
                          fund industry (data provided by Lipper Analytical Services).
                          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 a 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 Officers of the Fund manage its day-to-day operations and are
                          responsible to the Fund's Board of Directors. The Directors set broad
                          policies for the Fund and 
</TABLE>
 
                                        9

<PAGE>   12
<TABLE>
<S>                       <C>
                          choose its Officers. A list of Directors and Officers of the Fund and a 
                          statement of their present positions and principal occupations during the 
                          past five years can be found in the Statement of Additional Information.
                          Vanguard provides distribution and marketing services to the funds.
                          However, each fund bears its share of the Group's distribution costs.
- --------------------------------------------------------------------------------------------------
INVESTMENT                The Fund employs Mellon Capital Management Corporation, 595 Market St.,
ADVISER                   Suite 3000, San Francisco, CA 94105, as its investment adviser. Under an
                          investment advisory agreement dated August 25, 1988, the adviser manages
MELLON CAPITAL            the investment and reinvestment of the assets of the Fund and
MANAGEMENT                continuously reviews, supervises and administers the Fund's investment
MANAGES THE FUND'S        program. The adviser discharges its responsibilities subject to the
INVESTMENTS               control of the Officers and Directors of the Fund.
                          The adviser is a professional counseling firm which manages
                          well-diversified stock and bond portfolios for institutional clients. As
                          of September 30, 1993 the adviser provided investment advisory services
                          to 157 clients and managed assets with an approximate value of $34.3
                          billion. The adviser's asset allocation strategy was developed by the
                          adviser's Chairman, William Fouse, in 1972, and is used by 93 of its
                          clients and accounts for approximately $10.9 billion of the assets that
                          it manages. For its asset allocation clients, including the Fund, the
                          adviser employs a proprietary asset allocation model in managing client
                          investment portfolios and an indexing approach in selecting individual
                          equity securities. The Fund is one of the adviser's two investment
                          company clients.
                          The adviser was founded in October 1983 by a group of investment
                          professionals from Wells Fargo Bank, including Mr. Fouse. Mr. Fouse has
                          been responsible for overseeing the implementation of the firm's
                          strategy for the Fund since the Fund's inception. The adviser is a
                          wholly owned subsidiary of MBC Investment Corporation, which itself is a
                          subsidiary of Mellon Bank Corporation.
                          The Fund pays the adviser a basic fee at the end of each fiscal quarter,
                          calculated by applying a quarterly rate, based on the following annual
                          percentage rates, to the Fund's average month-end net assets for the
                          quarter:
</TABLE>
 
<TABLE>
<CAPTION>
                                                           
                                            NET ASSETS         RATE
                                       --------------------    ----
                                       <S>                     <C>
                                       First $100 million      .20%
                                       Over $100 million       .15%

                          This fee may be increased or decreased by applying an adjustment formula
                          based on the performance of the Fund relative to the investment record
                          of the S&P 500 Index. The fee payment will be increased (decreased) by
                          an incentive (penalty) of 0.05% of average net assets if the Fund's
                          cumulative investment performance for the thirty-six months preceding
                          the end of the quarter is at least six percentage points above (below)
                          the cumulative investment record of the S&P 500 Index for the same
                          period. For the year ended September 30, 1993, the investment advisory
                          fee paid by the Fund represented an effective annual rate of .16 of 1%
                          before an increase of .01 of 1% based on performance.
 </TABLE>
                                       10

<PAGE>   13
<TABLE>
<S>                       <C>
                          The investment advisory agreement authorizes the adviser to select
                          brokers or dealers to execute purchases and sales of the Fund's
                          portfolio securities, and directs the adviser to use its best efforts to
                          obtain the best available price and most favorable execution with
                          respect to all transactions. The full range and quality of brokerage
                          services available are considered in making these determinations.
                          The Fund has authorized the adviser to pay higher commissions in
                          recognition of brokerage services felt necessary for the achievement of
                          better execution, provided the adviser believes this to be in the best
                          interest of the Fund. Although the Fund does not market its shares
                          through intermediary brokers or dealers, the Fund may place orders with
                          qualified broker-dealers who recommend the Fund to clients if the
                          Officers of the Fund believe that the quality of the transaction and the
                          commission are comparable to what they would be with other qualified
                          brokerage firms.
                          The Fund's Board of Directors may, without the approval of shareholders,
                          provide for: (a) the employment of a new investment adviser pursuant to
                          the terms of a new advisory agreement either as a replacement for an
                          existing adviser or as an additional adviser; (b) a change in the terms
                          of an advisory agreement; and (c) the continued employment of an
                          existing adviser on the same advisory contract terms where a contract
                          has been assigned because of a change in control of the adviser. Any
                          such change will only be made upon not less than 30 days prior written
                          notice to shareholders of the Fund which shall include substantially the
                          information concerning the adviser that would have normally been
                          included in a proxy statement.
- --------------------------------------------------------------------------------------------------
PERFORMANCE               The table below provides investment results for the Fund for several
RECORD                    periods throughout the Fund's lifetime. The results shown represent
                          "total return" investment performance, which assumes the reinvestment of
                          all capital gains and income dividends for the indicated periods. Also
                          included is comparative information with respect to the unmanaged
                          Standard & Poor's 500 Composite Stock Price Index, a widely-used
                          barometer of stock market activity, and the Consumer Price Index, a
                          statistical measure of changes in the prices of goods and services. The
                          tables do not make any allowance for federal, state or local income
                          taxes, which shareholders must pay on a current basis.
                          The results should not be considered a representation of the total
                          return from an investment made in the Fund today. This information is
                          provided to help investors better understand the Fund and may not
                          provide a basis for comparison with other investments or mutual funds
                          which use a different method to calculate performance. During the
                          periods shown, Mellon Capital Management Corporation served as the
                          Fund's sole investment adviser.
</TABLE>
 
                                       11

<PAGE>   14
 
<TABLE>
<CAPTION>
                                  AVERAGE ANNUAL RETURN FOR VANGUARD ASSET ALLOCATION FUND   
                                                               PERCENTAGE CHANGE             
                                                  -------------------------------------------
                                FISCAL PERIODS    VANGUARD ASSET      S&P 500      CONSUMER  
                                ENDED 9/30/93     ALLOCATION FUND      INDEX      PRICE INDEX
                                --------------    ---------------     -------     -----------
                                <S>               <C>                 <C>         <C>        
                                1 Year                 +15.41%         +13.0          +2.7%  
                                Lifetime*              +14.6           +14.3            --   
</TABLE>                                  
 
<TABLE>
<S>                       <C>
                          *November 3, 1988, to September 30, 1993.
- --------------------------------------------------------------------------------------------------
DIVIDENDS,                The Fund expects to pay dividends semi-annually from ordinary income.
CAPITAL GAINS             Net capital gains distributions, if any, will be made annually.
AND TAXES
                          In addition, in order to satisfy certain distribution requirements of
THE FUND PAYS SEMI-       the Tax Reform Act of 1986, the Fund may declare special year-end
ANNUAL DIVIDENDS          dividend and capital gains distributions during December. Such
AND ANY CAPITAL           distributions, if received by shareholders by January 31, are deemed to
GAINS ANNUALLY            have been paid by the Fund and received by shareholders on December 31st
                          of the prior year.
                          Dividend and capital gains distributions may be automatically reinvested
                          or received in cash. See "Choosing a Distribution Option" for a
                          description of these distribution methods.
                          The Fund intends to continue to qualify for taxation as a "regulated
                          investment company" under the Internal Revenue Code so that it will not
                          be subject to federal income tax to the extent its income is distributed
                          to shareholders. Dividends paid by the Fund from net investment income
                          and net short-term capital gains, whether received in cash or reinvested
                          in additional shares, will be taxable to shareholders as ordinary
                          income. For corporate investors, dividends from net investment income
                          and net short-term capital gains will generally qualify in part for the
                          intercorporate dividends-received deduction. However, the portion of the
                          dividends so qualified depends on the aggregate taxable qualifying
                          dividend income received by the Fund from domestic (U.S.) sources.
                          Distributions paid by the Fund from long-term capital gains, whether
                          received in cash or reinvested in additional shares, are taxable as
                          long-term capital gains, regardless of the length of time you have owned
                          shares in the Fund. Capital gains distributions are made when the Fund
                          realizes net capital gains on sales of portfolio securities during the
                          year. The Fund does not seek to realize any particular amount of capital
                          gains during a year; rather, realized gains are a byproduct of portfolio
                          management activities. Consequently, capital gains distributions may be
                          expected to vary considerably from year to year; there will be no
                          capital gains distributions in years when the Fund realizes net capital
                          losses.
                          Note that if you accept capital gains distributions in cash, instead of
                          reinvesting them in additional shares, you are in effect reducing the
                          capital at work for you in the Fund. Also, keep in mind that if you
                          purchase shares in the Fund shortly before the record date for a
                          dividend or capital gains distribution, a portion of your
</TABLE>
 
                                       12
<PAGE>   15
<TABLE>
<S>                       <C>
                          investment will be returned to you as a taxable distribution, regardless
                          of whether you are reinvesting your distributions or receiving them in
                          cash.
                          The Fund will notify you annually as to the tax status of dividend and
                          capital gains distributions paid by the Fund.
A CAPITAL GAIN OR LOSS    A sale of shares of the Fund is a taxable event and may result in a
MAY BE REALIZED UPON      capital gain or loss. A capital gain or loss may be realized from an
EXCHANGE OR               ordinary redemption of shares or an exchange of shares between two
REDEMPTION                mutual funds (or two portfolios of a mutual fund).
                          Dividend distributions, capital gains distributions, and capital gains
                          or losses from redemptions and exchanges may be subject to state and
                          local taxes.
                          The Fund is required to withhold 31% of taxable dividends, capital gains
                          distributions, and redemptions paid to shareholders who have not
                          complied with IRS taxpayer identification regulations. You may avoid
                          this withholding requirement by certifying on your Account Registration
                          Form your proper Social Security or Taxpayer Identification Number and
                          by certifying that you are not subject to backup withholding.
                          The Fund has obtained a Certificate of Authority to do business as a
                          foreign corporation in Pennsylvania and does business and maintains an
                          office in that state. In the opinion of counsel, the shares of the Fund
                          are exempt from Pennsylvania personal property taxes.
                          The tax discussion set forth above is included for general information
                          only. Prospective investors should consult their own tax advisers
                          concerning the tax consequences of an investment in the Fund. The Fund
                          is managed without regard to tax ramifications.
- --------------------------------------------------------------------------------------------------
THE FUND'S SHARE          The Fund's share price or "net asset value" per share is determined by
PRICE                     dividing the total market value of the Fund's investments and other
                          assets, less any liabilities, by the number of outstanding shares of the
                          Fund. The Fund's net asset value is determined at the close of regular
                          trading (generally, 4:00 p.m. Eastern time) each day the New York Stock
                          Exchange is open for trading.
                          Common stocks that are listed on a securities exchange are valued at the
                          last quoted sales price on the day the valuation is made. Price
                          information on listed stocks is taken from the exchange where the
                          security is primarily traded. Securities which are listed on an exchange
                          but which are not traded on the valuation date are valued at the mean of
                          the bid and asked prices. Unlisted securities for which market
                          quotations are readily available are valued at the latest quoted bid
                          price. Bonds are valued at the latest bid prices and on the basis of a
                          matrix system (which considers such factors as security prices, yields,
                          maturities and ratings), both as furnished by independent pricing
                          services. Other assets and securities for which no quotations are
                          readily available are valued at fair value as determined in good faith
                          by the Directors. Securities may be valued on the basis of prices
                          provided by a pricing service when such prices are believed to reflect
                          the fair market value of such
</TABLE>
 
                                       13
<PAGE>   16
 
<TABLE>
<S>                       <C>
                          securities. Short-term instruments (those with remaining maturities of
                          60 days or less) are valued at cost, which approximates market.
                          The Fund's share price can be found daily in the mutual fund listings of
                          most major newspapers under the heading of The Vanguard Group.
- --------------------------------------------------------------------------------------------------
GENERAL                   The Fund is a Maryland corporation. The Articles of Incorporation permit
INFORMATION               the Directors to issue 1,000,000,000 shares of common stock, with a
                          $.001 par value. The Board of Directors has the power to designate one
                          or more classes ("series") of shares of common stock and to classify or
                          reclassify any unissued shares with respect to such series. Currently
                          the Fund is offering one class of shares.
                          The shares of the Fund are fully paid and non-assessable; have no
                          preference as to conversion, exchange, dividends, retirement or other
                          features; and have no pre-emptive rights. Such shares have
                          non-cumulative voting rights, meaning that the holders of more than 50%
                          of the shares voting for the election of Directors can elect 100% of the
                          Directors if they so choose.
                          Annual meetings of shareholders will not be held except as required by
                          the Investment Company Act of 1940 and other applicable law. An annual
                          meeting will be held to vote on the removal of a Director or Directors
                          of the Fund if requested in writing by the holders of not less than 10%
                          of the outstanding shares of the Fund.
                          All securities and cash are held by State Street Bank and Trust Company,
                          Boston, MA. The Vanguard Group, Inc., Valley Forge, PA, serves as the
                          Fund's Transfer and Dividend Disbursing Agent. Price Waterhouse serves
                          as independent accountants for the Fund and will audit its financial
                          statements annually. The Fund is not involved in any litigation.
- --------------------------------------------------------------------------------------------------
</TABLE>
 
                                       14
<PAGE>   17
<TABLE>
<S>                       <C>
SHAREHOLDER GUIDE
OPENING AN                To open a new account, either by mail or by wire, simply complete and
ACCOUNT AND               return an Account Registration Form or appropriate Adoption Agreement
PURCHASING                (e.g., the IRA Adoption Agreement) and any required legal documentation.
SHARES                    Please indicate the amount you wish to invest. Your purchase must be
                          equal to or greater than the $3,000 minimum initial investment
                          requirement ($500 for Individual Retirement Accounts, other retirement
                          accounts and Uniform Gifts/Transfers to Minors Act accounts). If you
                          need assistance with the Account Registration Form or have any questions
                          about the Fund, please call our Investor Information Department at
                          1-800-662-7447. Note: For other types of account registrations (e.g.
                          corporations, associations, other organizations, trusts or power of
                          attorney), please call us to determine which additional forms you may
                          need.
                          The Fund's shares are purchased at the next-determined net asset value
                          after your investment has been received. The Fund is offered on a
                          no-load basis (i.e., there are no sales commissions or 12b-1 fees).
ADDITIONAL                Subsequent investments may be made by mail ($100 minimum), wire ($1,000
INVESTMENTS               minimum), exchange from another Vanguard Fund account, or Vanguard Fund
                          Express. However, the Fund reserves the right to reject any specific
                          purchase request, whether it be made by check, wire, exchange from
                          another Vanguard Fund account or Vanguard Fund Express.
                          ------------------------------------------------------------------------
</TABLE>
 
<TABLE>
<S>                       <C>                                       <C>
                                                                    ADDITIONAL INVESTMENTS
                          NEW ACCOUNT                               TO EXISTING ACCOUNTS
PURCHASING BY MAIL        Please include the amount of              Additional investments should
                          your initial investment on the            include the Invest-by-Mail
Complete and sign the     registration form, make your              remittance form attached to your
enclosed Account          check payable to The Vanguard             Fund confirmation statements.
Registration Form         Group-78 and                              Please make your check payable
                          mail to:                                  to The Vanguard Group-78, write
                                                                    your account number on your
                          VANGUARD FINANCIAL CENTER                 check and, using the return
                          P.O. BOX 2600                             envelope provided, mail to the
                          VALLEY FORGE, PA 19482                    address indicated on the Invest-
                                                                    by-Mail Form.
For express or            VANGUARD FINANCIAL CENTER                 All written requests should be
registered mail,          455 DEVON PARK DRIVE                      mailed to one of the addresses
send to:                  WAYNE, PA 19087                           indicated for new accounts. Do
                                                                    not send registered or express
                                                                    mail to the post office box
                                                                    address.
                          --------------------------------------------------------------------------
</TABLE>
 
                                       15
<PAGE>   18
<TABLE>
<S>                       <C>                                       <C>
PURCHASING BY WIRE                          CORESTATES BANK, N.A.
                                            ABA 031000011
Money should be                             CORESTATES NO. 0101 9897
wired to:                                   ATTN VANGUARD
                                            VANGUARD ASSET ALLOCATION FUND
BEFORE WIRING                               ACCOUNT NUMBER
                                            ACCOUNT REGISTRATION
Please contact
Client Services           To assure proper receipt, please be sure your bank includes the name of
(1-800-662-2739)          the Fund, the account number Vanguard has assigned to you and the eight
                          digit CoreStates number. If you are opening a new account, please complete
                          the Account Registration Form and mail it to the "New Account" address
                          after completing your wire arrangement. Note: Federal Funds wire purchase
                          orders will be accepted only when the Fund and Custodian Bank are open for
                          business.
</TABLE>
<TABLE>
<S>                       <C>
                          ------------------------------------------------------------------------
PURCHASING BY             You may open an account or purchase additional shares by making an
EXCHANGE (from a          exchange from another Vanguard Fund account. However, the Fund reserves
Vanguard account)         the right to refuse any exchange purchase request. Call our Client
                          Services Department toll-free at 1-800-662-2739. The new account will
                          have the same registration as the existing account.
                          ------------------------------------------------------------------------
PURCHASING BY             The Fund Express Special Purchase option lets you move money from your
FUND EXPRESS              bank account to your Vanguard account at your request. Or if you choose
                          the Automatic Investment option, money will be moved from your bank
Special Purchase and      account to your Vanguard account on the schedule--monthly, bimonthly
Automatic Investment      (every other month), quarterly or yearly--you select. To establish these
                          Fund Express options, please provide the appropriate information on the
                          Account Registration Form. We will send you a confirmation of your Fund
                          Express service; please wait three weeks before using the service.
- --------------------------------------------------------------------------------------------------
CHOOSING A                You must select one of three distribution options:
DISTRIBUTION
OPTION                    1. AUTOMATIC REINVESTMENT OPTION--Both dividends and capital gains
                             distributions will be reinvested in additional Fund shares. This option
                             will be selected for you automatically unless you specify one of the
                             other options.
                          2. CASH DIVIDEND OPTION--Your dividends will be paid in cash and your
                             capital gains will be reinvested in additional Fund shares.
                          3. ALL CASH OPTION--Both dividend and capital gains distributions will
                             be paid in cash.
                          You may change your option by calling our Client Services Department
                          (1-800-662-2739).
                          An option to invest your dividends and/or capital gains distributions in
                          another Vanguard Fund account is available. Please call our Client
                          Services Department (1-800-662-2739) for information. You may also elect
                          Vanguard Dividend Express which allows you to transfer your dividends
                          and/or capital gains distributions
</TABLE>
 
                                       16
<PAGE>   19
<TABLE>
<S>                       <C>
                          automatically to your bank account. Please see "Other Vanguard Services"
                          for more information.
IMPORTANT TAX NOTE        If you purchase shares shortly before a distribution of dividends or
                          capital gains, a portion of your investment will be classified as a
                          taxable distribution (regardless of whether you are reinvesting your
                          distributions or taking them in cash).
- --------------------------------------------------------------------------------------------------
IMPORTANT                 The easiest way to establish optional Vanguard services on your account
INFORMATION               is to select the options you desire when you complete your Account
                          Registration Form. If you wish to add shareholder options later, you may
OPTIONAL SERVICES         need to provide Vanguard with additional information and a signature
                          guarantee. Please call our Client Services Department (1-800-662-2739)
                          for further assistance.
SIGNATURE                 For our mutual protection, we may require a signature guarantee on
GUARANTEES                certain written transaction requests. A signature guarantee verifies the
                          authenticity of your signature and may be obtained from banks, brokers
                          and any other guarantor that Vanguard deems acceptable. A SIGNATURE
                          GUARANTEE CANNOT BE PROVIDED BY A NOTARY PUBLIC.
CERTIFICATES              Share certificates will be issued upon request. If a certificate is
                          lost, you may incur an expense to replace it.
BROKER-DEALER             If you purchase shares in Vanguard Funds through a registered
PURCHASES                 broker-dealer or investment adviser, the broker-dealer or adviser may
                          charge a service fee.
CANCELLING TRADES         The Fund will not cancel any trade (e.g., a purchase, exchange, or
                          redemption) believed to be authentic, received in writing or by
                          telephone, once the trade has been received.
- --------------------------------------------------------------------------------------------------
WHEN YOUR                 Your trade date is the date on which your account is credited. If your
ACCOUNT WILL BE           purchase is made by check, Federal Funds wire, or exchange, and is
CREDITED                  received by the close of regular trading on the New York Stock Exchange,
                          (generally 4:00 p.m. Eastern time), your trade date is the day of
                          receipt. If your purchase is received after the close of the Exchange,
                          your trade date is the next business day. Your shares are purchased at
                          the net asset value determined on your trade date.
                          In order to prevent lengthy processing delays caused by the clearing of
                          foreign checks, Vanguard will only accept a foreign check which has been
                          drawn in U.S. dollars and has been issued by a foreign bank with a U.S.
                          correspondent bank.
                          Because of the risks associated with common stock and bond investments,
                          the Fund is intended to be a long-term investment vehicle and is not
                          designed to provide investors with a means of speculating on short-term
                          stock and bond market movements. Consequently the Fund reserves the
                          right to reject any specific purchase (and exchange purchase) request.
                          The Fund also reserves the right to suspend the offering of shares for a
                          period of time.
- --------------------------------------------------------------------------------------------------
SELLING YOUR              You may withdraw any portion of the funds in your account by redeeming
SHARES                    shares at any time (please see Important Redemption Information). You
                          may initiate a
</TABLE>
 
                                       17
<PAGE>   20
 
<TABLE>
<S>                       <C>
                          request by writing or by telephoning.  Your redemption proceeds are 
                          normally mailed within two business days after the receipt of the request 
                          in Good Order.
                          ------------------------------------------------------------------------
SELLING BY MAIL           Requests should be mailed to VANGUARD FINANCIAL CENTER, VANGUARD ASSET
                          ALLOCATION FUND, P.O. BOX 1120, VALLEY FORGE, PA 19482. (For express or
                          registered mail, send your request to Vanguard Financial Center,
                          Vanguard Asset Allocation Fund, 455 Devon Park Drive, Wayne, PA 19087.)
                          The redemption price of shares will be the Fund's net asset value next
                          determined after Vanguard has received all required documents in Good
                          Order.
                          ------------------------------------------------------------------------
DEFINITION OF             GOOD ORDER means that the request includes the following:
GOOD ORDER
                          1. The account number and Fund name.
                          2. The amount of the transaction (specified in dollars or shares).
                          3. Signatures of all owners EXACTLY as they are registered on the
                             account.
                          4. Any required signature guarantees.
                          5. Other supporting legal documentation that might be required in the
                             case of estates, corporations, trusts and certain other accounts.
                          If you have questions about this definition as it pertains to your
                          request, please call our Client Services Department at 1-800-662-2739.
                          ------------------------------------------------------------------------
SELLING BY TELEPHONE      To sell shares by telephone, you or your pre-authorized representative
                          may call our Client Services Department at 1-800-662-2739. The proceeds
                          will be sent to you by mail. In addition to the details below, please
                          see "Important Information About Telephone Transactions."
                          BY MAIL: Telephone mail redemption is automatically established on your
                          account unless you indicate otherwise on your Account Registration Form.
                          You may redeem any amount by calling Vanguard. The proceeds will be paid
                          to the registered shareholders and mailed to the address of record.
                          ------------------------------------------------------------------------
SELLING BY FUND           If you select the Fund Express Automatic Withdrawal option, money will
EXPRESS                   be automatically moved from your Vanguard Fund account to your bank
                          account according to the schedule you have selected. The Special
Automatic                 Redemption option lets you move money from your Vanguard account to your
Withdrawal                bank account on your request. You may elect Fund Express on the Account
& Special Redemption      Registration Form or call our Investor Information Department at
                          1-800-662-7447 for a Fund Express application.
                          ------------------------------------------------------------------------
SELLING BY EXCHANGE       You may sell shares by making an exchange to another Vanguard Fund
                          account. Please see "Exchanging Your Shares" for details.
                          ------------------------------------------------------------------------
IMPORTANT                 Shares purchased by check, Fund Express Special Purchase or Fund Express
REDEMPTION                Automatic Investment Plan may not be redeemed until payment for the
INFORMATION               purchase is collected, which may take up to ten calendar days. Your
                          money is invested during the holding period.
                          ------------------------------------------------------------------------
</TABLE>
 
                                       18

<PAGE>   21
 
<TABLE>
<S>                       <C>
DELIVERY OF               Redemption requests received by telephone prior to the close of regular
REDEMPTION PROCEEDS       trading on the New York Stock Exchange (generally, 4:00 p.m. Eastern
                          time) are processed on the day of receipt and the redemption proceeds
                          are normally sent on the following business day.
                          Redemption requests received by telephone after the close of the
                          Exchange are processed on the business day following receipt and the
                          proceeds are normally sent on the second business day following receipt.
                          The Fund reserves the right to revise or terminate the telephone
                          redemption privilege at any time.
                          Redemption proceeds must be sent to you within seven days of receipt of
                          your request in Good Order.
                          If you experience difficulty in making a telephone redemption during
                          periods of drastic economic or market changes, your redemption request
                          may be made by regular or express mail. It will be implemented at the
                          net asset value next determined after your request has been received by
                          Vanguard in Good Order.
                          The Fund may suspend the redemption right or postpone payment at times
                          when the New York Stock Exchange is closed or under any emergency
                          circumstances as determined by the United States Securities and Exchange
                          Commission.
                          If the Board of Directors determines that it would be detrimental to the
                          best interests of the Fund's remaining shareholders to make payment in
                          cash, the Fund may pay redemption proceeds in whole or in part by a
                          distribution in kind of readily marketable securities.
                          ------------------------------------------------------------------------
VANGUARD'S AVERAGE        If you make a redemption from a qualifying account, Vanguard will send
COST STATEMENT            you an Average Cost Statement which provides you with the tax basis of
                          the shares you redeemed. Please see "Other Vanguard Services" for
                          additional information.
                          ------------------------------------------------------------------------
MINIMUM ACCOUNT           Due to the relatively high cost of maintaining smaller accounts, the
BALANCE                   Fund reserves the right to redeem shares in any account that is below
REQUIREMENT               the minimum initial investment amount of $3,000. In addition, if at any
                          time the total investment does not have a value of at least $1,000, you
                          may be notified that the value of your account is below the Fund's
                          minimum account balance requirement. You would then be allowed 60 days
                          to make an additional investment before the account is liquidated.
                          Proceeds would be promptly paid to the shareholder. This minimum does
                          not apply to Individual Retirement Accounts, other retirement accounts
                          and Uniform Gifts/Transfers to Minors Act accounts.
- --------------------------------------------------------------------------------------------------
EXCHANGING YOUR           Should your investment goals change, you may exchange your shares of
SHARES                    Vanguard Asset Allocation Fund for those of other available Vanguard
                          Funds.
EXCHANGING BY
TELEPHONE:                In addition to the details below, please see "Important Information
Call Client Services      About Telephone Transactions."
(1-800-662-2739)
                          When exchanging shares by telephone, please have ready the Fund name,
                          account number, Social Security number or Taxpayer Identification number listed
                          on the 
</TABLE>
 
                                       19
 
<PAGE>   22
<TABLE>
<S>                       <C>
                          account, and account address. Only the registered shareowner may
                          complete such an exchange. Requests for telephone exchanges received
                          prior to the close of the New York Stock Exchange (generally, 4:00 p.m.
                          Eastern time) are processed at the close of business that same day.
                          Requests received after the close of the Exchange are processed the next
                          business day. TELEPHONE EXCHANGES ARE NOT ACCEPTED INTO OR FROM VANGUARD
                          BALANCED INDEX FUND, VANGUARD EXPLORER FUND, VANGUARD INDEX TRUST,
                          VANGUARD INTERNATIONAL EQUITY INDEX FUND--EUROPEAN AND PACIFIC
                          PORTFOLIOS, AND VANGUARD QUANTITATIVE PORTFOLIOS. If you experience
                          difficulty in making a telephone exchange, your exchange request may be
                          made by regular or express mail, and it will be implemented at the
                          closing net asset value on the date received by Vanguard provided the
                          request is received in Good Order.
                          ------------------------------------------------------------------------
EXCHANGING BY MAIL        Please be sure to include on your exchange request the name and account
                          number of your current Fund, the name of the Fund you wish to exchange
                          into, the amount you wish to exchange, and the signatures of all
                          registered account holders. Send your request to VANGUARD FINANCIAL
                          CENTER, VANGUARD ASSET ALLOCATION FUND, P.O. BOX 1120, VALLEY FORGE, PA
                          19482. (For express or registered mail, send your request to Vanguard
                          Financial Center, Vanguard Asset Allocation Fund, 455 Devon Park Drive,
                          Wayne, PA 19087.)
                          ------------------------------------------------------------------------
IMPORTANT EXCHANGE        Before you make an exchange, you should consider the following:
INFORMATION
                          - Please read the Fund's prospectus before making an exchange. For a
                            copy and for answers to any questions you may have, call our Investor
                            Information Department (1-800-662-7447).
                          - An exchange is treated as a redemption and a purchase. Therefore, you
                            could realize a taxable gain or loss on the transaction.
                          - Exchanges are accepted only if the registrations and the Taxpayer
                            Identification numbers of the two accounts are identical.
                          - The shares to be exchanged must be on deposit and not held in
                            certificate form.
                          - New accounts are not currently accepted in Vanguard/Windsor Fund.
                          - The redemption price of shares redeemed by exchange is the net asset
                            value next determined after Vanguard has received the required
                            documentation in Good Order.
                          - When opening a new account by exchange, you must meet the minimum
                            investment requirement of the new Fund.
                          Every effort will be made to maintain the exchange privilege. However,
                          the Fund reserves the right to revise or terminate its provisions, limit
                          the amount of or reject any exchange, as deemed necessary, at any time.
- --------------------------------------------------------------------------------------------------
EXCHANGE                  The Fund's exchange privilege is not intended to afford shareholders a
PRIVILEGE                 way to speculate on short-term movements in the market. Accordingly, in
LIMITATIONS               order to prevent excessive use of the exchange privilege that may
                          potentially disrupt the manage-
</TABLE>
 
                                       20

<PAGE>   23
<TABLE>
<S>                       <C>
                          ment of the Fund and increase transaction costs, the Fund has established 
                          a policy of limiting excessive exchange activity.
                          Exchange activity generally will not be deemed excessive if limited to
                          TWO SUBSTANTIVE EXCHANGE REDEMPTIONS (AT LEAST 30 DAYS APART) from the
                          Fund during any calendar year. These limitations do not apply to
                          exchanges from Vanguard's money market portfolios.
IMPORTANT                 The ability to initiate redemptions (except wire redemptions) and
INFORMATION ABOUT         exchanges by telephone is automatically established on your account
TELEPHONE                 unless you request in writing that telephone transactions on your
TRANSACTIONS              account not be permitted.
                          To protect your account from losses resulting from unauthorized or
                          fraudulent telephone instructions, Vanguard adheres to the following
                          security procedures:
                          1. SECURITY CHECK. To request a transaction by telephone, the caller
                             must know (i) the name of the Portfolio; (ii) the 10-digit account
                             number; (iii) the exact name in which the account is registered; and
                             (iv) the Social Security or Taxpayer Identification number listed on
                             the account.
                          2. PAYMENT POLICY. The proceeds of any telephone redemption by mail will
                             be made payable to the registered shareowner and mailed to the address
                             of record, only.
                          Neither the Fund nor Vanguard will be responsible for the authenticity
                          of transaction instructions received by telephone, provided that
                          reasonable security procedures have been followed. Vanguard believes
                          that the security procedures described above are reasonable and that if
                          such procedures are followed, you will bear the risk of any losses
                          resulting from unauthorized or fraudulent telephone transactions on your
                          account. If Vanguard fails to follow reasonable security procedures, it
                          may be liable for any losses resulting from unauthorized or fraudulent
                          telephone transactions on your account.
- --------------------------------------------------------------------------------------------------
TRANSFERRING              You may transfer the registration of any of your Fund shares to another
REGISTRATION              person by completing a transfer form and sending it to: VANGUARD
                          FINANCIAL CENTER, P.O. BOX 1110, VALLEY FORGE, PA 19482. The request
                          must be in Good Order. BEFORE MAILING YOUR REQUEST, PLEASE CALL OUR
                          CLIENT SERVICES DEPARTMENT (1-800-662-2739) FOR FULL INSTRUCTIONS.
- --------------------------------------------------------------------------------------------------
OTHER VANGUARD            For more information about any of these services, please call our
SERVICES                  Investor Information Department at 1-800-662-7447.
STATEMENTS AND            Vanguard will send you a confirmation statement each time you initiate a
REPORTS                   transaction in your account except for checkwriting redemptions from
                          Vanguard money market accounts. You will also receive a comprehensive
                          account statement at the end of each calendar quarter. The
                          fourth-quarter statement will be a year-end statement, listing all
                          transaction activity for the entire calendar year.
                          Vanguard's Average Cost Statement provides you with the average cost of
                          shares redeemed from your account, using the average cost single
                          category method. This service is available for most taxable accounts
                          opened since January 1, 1986. In 
</TABLE>
 
                                       21

<PAGE>   24
<TABLE>
<S>                       <C>
                          general, investors who redeemed shares from a qualifying Vanguard account 
                          may expect to receive their Average Cost Statement in February of the 
                          following year. Please call our Client Services Department (1-800-662-2739) 
                          for information.
                          Financial reports on the Fund will be mailed to you semi-annually,
                          according to the Fund's fiscal year-end.
VANGUARD DIRECT           With Vanguard's Direct Deposit Service, most U.S. Government checks
DEPOSIT SERVICE           (including Social Security and military pension checks) and private
                          payroll checks may be automatically deposited into your Vanguard Fund
                          account. Separate brochures and forms are available for direct deposit
                          of U.S. Government and private payroll checks.
VANGUARD AUTOMATIC        Vanguard's Automatic Exchange Service allows you to move money
EXCHANGE SERVICE          automatically among your Vanguard Fund accounts. For instance, the
                          service can be used to "dollar cost average" from a money market
                          portfolio into a stock or bond fund or to contribute to an IRA or other
                          retirement plan.
VANGUARD FUND             Vanguard's Fund Express allows you to transfer money between your Fund
EXPRESS                   account and your account at a bank, savings and loan association, or a
                          credit union that is a member of the Automated Clearing House (ACH)
                          system. You may elect this service on the Account Registration Form or
                          call our Investor Information Department (1-800-662-7447) for a Fund
                          Express application.
                          The minimum amount that can be transferred by telephone is $100.
                          However, if you have established one of the automatic options, the
                          minimum amount is $50. The maximum amount that can be transferred using
                          any of the options is $100,000.
                          Special rules govern how your Fund Express purchases or redemptions are
                          credited to your account. In addition, some services of Fund Express
                          cannot be used with specific Vanguard Funds. For more information,
                          please refer to the Vanguard Fund Express brochure.
VANGUARD DIVIDEND         Vanguard's Dividend Express allows you to transfer your dividends and/or
EXPRESS                   capital gains distributions automatically from your Fund account, one
                          business day after the Fund's payable date, to your account at a bank,
                          savings and loan association, or credit union that is a member of the
                          Automated Clearing House (ACH) network. You may elect this service on
                          the Account Registration Form or call our Investor Information
                          Department (1-800-662-7447) for a Vanguard Dividend Express application.
VANGUARD                  Vanguard's Tele-Account is a convenient, automated service that provides
TELE-ACCOUNT              share price, price change and yield quotations on Vanguard Funds through
                          any TouchTone(TM) telephone. This free service also lets you obtain
                          information about your account balance, your last transaction, and your
                          most recent dividend or capital gains payment. To contact Vanguard's
                          Tele-Account service, dial 1-800-ON-BOARD (1-800-662-6273). A free
                          brochure offering detailed operating instructions is available from our
                          Investor Information Department (1-800-662-7447).
- --------------------------------------------------------------------------------------------------
</TABLE>
 
                                       22

<PAGE>   25
 
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                                       23

<PAGE>   26
 
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                                       24
<PAGE>   27
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                             <C>                            <C> <C>
                                (VANGUARD LOGO)                                            (VANGUARD LOGO)
                                ---------------------------                     P   R   O   S   P   E   C   T   U   S
                                THE VANGUARD GROUP                                        DECEMBER 31, 1993
                                  OF INVESTMENT
                                  COMPANIES
                                Vanguard Financial Center
                                P.O. Box 2600
                                Valley Forge, PA 19482
    
                                INVESTOR INFORMATION
                                  DEPARTMENT:
                                1-800-662-7447 (SHIP)

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

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

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

                                TRANSFER AGENT:
                                The Vanguard Group, Inc.
                                Vanguard Financial Center
                                Valley Forge, PA 19482                                     
                                                                                           (VANGUARD LOGO)
</TABLE>
 
      IPO78
 
- --------------------------------------------------------------------------------
<PAGE>   28
 
                                     PART B
 
                      VANGUARD ASSET ALLOCATION FUND, INC.
 
                      STATEMENT OF ADDITIONAL INFORMATION
                               DECEMBER 31, 1993
 
  This Statement is not a prospectus but should be read in conjunction with the
Fund's current Prospectus (dated December 31, 1993). To obtain the Prospectus
please call:
 
                        Investor Information Department
                             1-800-662-7447 (SHIP)
 
<TABLE>
     <S>                                                                                  <C>
     TABLE OF CONTENTS                                                                    PAGE
     Investment Limitations............................................................      1
     Purchase of Shares................................................................      2
     Redemption of Shares..............................................................      2
     Management of the Fund............................................................      3
     Performance Measures..............................................................      5
     Total Return......................................................................      6
     Investment Advisory Services......................................................      6
     Portfolio Transactions............................................................      7
     Description of U.S. Government Securities.........................................      7
     Description of Repurchase Agreements..............................................      8
     Futures Contracts.................................................................      8
     Glossary..........................................................................     10
     Financial Statements..............................................................     11
</TABLE>
 
                             INVESTMENT LIMITATIONS
 
  The following restrictions are fundamental policies and cannot be changed
without approval of the holders of a majority of the outstanding shares of the
Fund, as defined in the Investment Company Act of 1940 (the "1940 Act"). The
Fund may not under any circumstances:
 
   1) Borrow money, except from banks (or through reverse repurchase agreements)
      for temporary or emergency purposes (not leveraging), and then only in an
      amount not in excess of 15% of the value of the Fund's net assets at the
      time the borrowing is made. Whenever borrowing exceeds 5% of the value of
      the Fund's assets, the Fund will not make any additional investments;
 
   2) With respect to 75% of the value of its total assets, purchase the
      securities of any issuer (except obligations of the United States
      government and its instrumentalities) if as a result the Fund would hold
      more than 10% of the outstanding voting securities of the issuer, or more
      than 5% of the value of the Fund's total assets would be invested in the
      securities of such issuer;
 
   3) Invest for the purpose of exercising control of management of any company;
 
   4) Purchase the securities of any other investment company, except as they
      may be acquired as part of a merger, consolidation or acquisition of
      assets or otherwise to the extent permitted by Section 12 of the 1940 Act.
      The Fund will invest only in investment companies which have investment
      objectives consistent with those of the Fund;
 
   5) The Fund will not engage in the business of underwriting securities issued
      by other persons except to the extent that the Fund may technically be
      deemed to be an underwriter under the Securities Act of 1933 in disposing
      of portfolio securities. Additionally, the Fund will not purchase or
      otherwise acquire any security if, as a result, more than 15% of its net
      assets would be invested in securities that are illiquid (included in this
      limitation is the Fund's investment in The Vanguard Group, Inc.);
 
   6) Invest in commodities, except that the Fund may invest in futures
      contracts, options and options on futures contracts to the extent that not
      more than 5% of the Fund's assets are required as margin deposit for
      futures contracts;
 
                                        1
<PAGE>   29
 
   
   7) Invest in real estate or real estate limited partnership interests
      although the Fund may purchase and sell securities of companies which
      invest in real estate, or interests therein;
    
 
   8) Purchase securities on margin or sell any securities short except as
      specified in investment limitation No. 6 above;
 
   
   9) Make loans except (i) by purchasing bonds, debentures or similar
      obligations (including repurchase agreements, subject to the limitation
      described in (5) above) which are either publicly distributed or
      customarily purchased by institutional investors, and (ii) by lending its
      securities to banks, brokers, dealers and other financial institutions so
      long as such loans are not inconsistent with the Investment Company Act or
      the Rules and Regulations or interpretations of the Securities and
      Exchange Commission thereunder. No loan of securities will be made if, as
      a result the aggregate of such loans in the Fund would exceed 33 1/3% of
      the value of the Fund's total assets;
    
 
  10) Pledge, mortgage, or hypothecate any of its assets to an extent greater
      than 5% of its total assets; and
 
  11) Invest more than 25% of the value of its total assets in any one industry.
 
   
  These investment limitations are considered at the time Portfolio securities
are purchased. Although not fundamental policies subject to shareholder vote, as
long as the Fund's shares are registered for sale in certain states, it will not
(i) invest in put, call, straddle or spread options except as permitted in
investment limitation No. 6, above, (ii) invest in interests in oil, gas or
other mineral exploration or development programs, (iii) invest more than 5% of
the assets of the Fund, at the time of investment, in the securities of any
issuers which have (with predecessors) a record of less than three years'
continuous operation, and (iv) purchase or retain any security if (i) one or
more officers, trustees or partners of the Fund or its investment adviser
individually own or would own, directly or beneficially, more than 1/2 of 1 per
cent of the securities of such issuer, and (ii) in the aggregate such persons
own or would own more than 5% of such securities.
    
 
  Notwithstanding these limitations, the Fund may own all or any portion of the
securities of, or make loans to, or contribute to the costs or other financial
requirements of any company which will be wholly owned by the Fund and one or
more other investment companies and is 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."
 
                               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 for initial and subsequent investments for certain
fiduciary accounts or under circumstances where certain economies can be
achieved in sales of the Fund's shares.
 
                              REDEMPTION OF SHARES
 
  The Fund may suspend redemption privileges 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 Fund to dispose of securities owned by it, or fairly to
determine the value of its assets, and (iii) for such other periods as the
Commission may permit.
 
  The Fund has made an election with the Commission to pay in cash all
redemptions requested by any shareholder of record limited in amount during any
90-day period to the lesser of $250,000 or l% of the net assets of the Fund at
the beginning of such period. Such commitment is irrevocable without the prior
approval of the Commission. Redemptions in excess of the above limits may be
paid in whole or in part, in investment securities or in cash, as the Directors
may deem advisable; however, payment will be made wholly in cash unless the
Directors believe that economic or market conditions exist which would make such
a practice detrimental to the best interests of the Fund. If redemptions are
paid in investment securities, such securities will be valued as set forth in
the Prospectus under "The Fund's Share Price" 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. Any redemption may be more or
less than the shareholder's cost depending on the market value of the securities
held by the Fund.
 
                                        2
<PAGE>   30
 
                             MANAGEMENT OF THE FUND
 
DIRECTORS AND OFFICERS
 
The officers of the Fund manage its day to day operations and are responsible to
the Fund's Board of Directors. The Directors set broad policies for the Fund and
choose its officers. The following is a list of Directors and officers of the
Fund and a statement of their present positions and principal occupations during
the past five years. The mailing address of the Directors and officers of the
Fund is Post Office Box 876, Valley Forge, PA 19482.
 
JOHN C. BOGLE, Chairman and Chief Executive Officer
 
  Chairman and Director of The Vanguard Group, Inc., and of each of the
  investment companies in The Vanguard Group, Director of the Mead Corporation
  and General Accident Insurance.
 
JOHN J. BRENNAN, President
 
  President and Director of The Vanguard Group, Inc., and of each of the
  investment companies in The Vanguard Group.
 
ROBERT E. CAWTHORN, Director
 
  Chairman and Chief Executive Officer, Rhone-Poulenc Rorer, Inc; Director of
  Immune Response Corp. and Sun Company, Inc; Trustee, Universal Health Realty
  Income Trust.
 
BARBARA BARNES HAUPTFUHRER, Director
 
  Director of The Great Atlantic and Pacific Tea Company, Alco Standard Corp.,
  Raytheon Company, Knight-Ridder, Inc., and Massachusetts Mutual Life Insurance
  Co.
 
BRUCE K. MACLAURY, Director
 
  President, The Brookings Institution; Director of Dayton Hudson Corporation,
  American Express Bank Ltd., and The St. Paul Companies, Inc.
 
BURTON G. MALKIEL, Director
 
  Chemical Bank Chairmen's Professor of Economics, Princeton University;
  Director of Prudential Insurance Co. of America, Amdahl Corporation, Baker
  Fentress & Co., and The Southern New England Telephone Company.
ALFRED M. RANKIN, JR., Director
  President, Chief Executive Officer and Director of NACCO Industries, Inc.;
  Director of The BFGoodrich Company, The Standard Products Company and The
  Reliance Electric Company.
 
JOHN C. SAWHILL, Director
  President and Chief Executive Officer, The Nature Conservancy; formerly,
  Director and Senior Partner, McKinsey & Co.; and President, New York
  University; Director of Pacific Gas and Electric Company and NACCO Industries.
 
JAMES O. WELCH, JR., Director
  Retired Chairman of Nabisco Brands, Inc., retired Vice Chairman and Director
  of RJR Nabisco; Director of TECO Energy, Inc.
 
J. LAWRENCE WILSON, Director
  Chairman and Director of Rohn & Haas Company; Director of Cummins Engine
  Company and Vanderbilt University; Trustee of the Culver Educational
  Foundation.
 
RAYMOND J. KLAPINSKY, Secretary
  Senior Vice President and Secretary of The Vanguard Group, Inc.; Secretary of
  each of the investment companies in The Vanguard Group.
 
RICHARD F. HYLAND, Treasurer
  Treasurer of The Vanguard Group, Inc., and of each of the invest-
  ment companies in The Vanguard Group.
 
KAREN E. WEST, Controller
  Vice President of The Vanguard Group, Inc.; Controller of each of the
  investment companies in The Vanguard Group.
 
  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.
 
  The Vanguard Group was established and operates under a Funds' Service
Agreement which was approved by the shareholders of each of the Funds. The
amounts which each of the Funds have invested are adjusted from time to time in
order to maintain the proportionate relationship between each Fund's relative
net assets and its contribution to Vanguard's capital. The Fund's Service
Agreement was amended on May 15, 1992 to provide as follows: (a) each Vanguard
Fund may invest up to .40% of its current assets in Vanguard, and (b) there is
no limit on the amount that each Vanguard Fund may contribute to Vanguard's
capitalization. At September 30, 1993, the Fund had contributed capital of
$161,000, representing .8% of Vanguard's capitalization.
 
                                        3
<PAGE>   31
 
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
September 30, 1993, the Fund's allocated share of Vanguard's actual net costs of
operations relating to management and administrative services (including
transfer agency) totaled approximately $2,008,000.
 
DISTRIBUTION
 
  Vanguard provides all distribution and marketing activities for the Funds in
the Group. Vanguard Marketing Corporation, a wholly-owned subsidiary of
Vanguard, acts as Sales Agent for the shares of the Funds in connection with any
sales made directly to investors in the states of Florida, Missouri, New York,
Ohio, Texas and such other states as it may be required.
 
  The principal distribution expenses are for advertising, promotional materials
and marketing personnel. Distribution services may also include organizing and
offering to the public, from time to time, one or more new investment companies
which will become members of the Group. The Directors and officers of Vanguard
determine the amount to be spent annually on distribution activities, the manner
and amount to be spent on each Fund, and whether to organize new investment
companies.
 
  One half of the distribution expenses of a marketing and promotional nature is
allocated among the Funds based upon relative net assets. The remaining one half
of those expenses is allocated among the Funds based upon each Fund's sales for
the preceding 24 months relative to the total sales of the Funds as a Group,
provided, however, that no Fund's aggregate quarterly rate of contribution for
distribution expenses of a marketing and promotional nature shall exceed 125% of
average distribution expense rate for the Group, and that no Fund shall incur
annual distribution expenses in excess of 20/100 of 1% of its average month-end
net assets. During the fiscal year ended September 30, 1993, the Fund paid
approximately $173,000 of the Group's distribution and marketing expenses, which
represented an effective annual rate of .02 of 1% of the Fund's average net
assets.
 
INVESTMENT ADVISORY SERVICES
 
  Vanguard provides investment advisory services to Vanguard Money Market
Reserves, Vanguard Institutional Portfolios, Vanguard Municipal Bond Fund,
Short-Term, Intermediate-Term, and Long-Term Corporate Portfolios of Vanguard
Fixed Income Securities Fund, Vanguard California Tax-Free Fund, Vanguard
Florida Insured Tax-Free Fund, Vanguard New Jersey Tax-Free Fund, Vanguard New
York Insured Tax-Free Fund, Vanguard Pennsylvania Tax-Free Fund, Vanguard Ohio
Tax-Free Fund, Vanguard Admiral Funds, Vanguard Balanced Index Fund, Vanguard
Bond Index Fund, Vanguard Index Trust, Vanguard International Equity Index Fund,
Money Market, High-Grade Bond, and Equity Index Portfolios of Vanguard Variable
Insurance Fund, Vanguard/Windsor II and Vanguard Institutional Index Fund. 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.
 
REMUNERATION OF DIRECTORS AND OFFICERS
 
  The Fund pays each Director 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. During the year ended September
30, 1993 the Fund's proportionate share of remuneration paid to all officers of
the Fund, as a group,was approximately $33,431.
 
  Retired Directors who are not officers are paid an annual fee based on the
number of years of service. The fee is equal to $1,000 for each year of service
and each investment company member of The Vanguard Group contributes a
proportionate amount to this fee based on its relative net assets. 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 its thrift plan, all eligible officers
are permitted to make pre-tax contributions in an amount up to 4% of total
compensation, subject to federal tax limitations, which are matched by Vanguard
on a 100% basis. The Fund's proportionate share of retirement contributions made
by Vanguard under its retirement and thrift plans on behalf of all Officers of
the Fund, as a group, during the 1993 fiscal year was approximately $4,929.
 
                                        4
<PAGE>   32
 
                              PERFORMANCE MEASURES
 
  Each of the investment company members of the Vanguard Group, including
Vanguard Asset Allocation Fund, may, from time to time, use one or more of the
following unmanaged indices for comparative performance purposes.
 
STANDARD AND POOR'S 500 COMPOSITE STOCK PRICE INDEX -- is a well diversified
list of 500 companies representing the U.S. Stock Market.
 
WILSHIRE 5000 EQUITY INDEXES -- consists of nearly 5,000 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.
 
MORGAN STANLEY CAPITAL INTERNATIONAL EAFE INDEX -- is an arithmetic, market
value-weighted average of the performance of over 900 securities listed on the
stock exchanges of countries in Europe, Australia and the Far East.
 
GOLDMAN SACHS 100 CONVERTIBLE BOND INDEX -- currently includes 67 bonds and 33
preferreds. The original list of names was generated by screening for
convertible issues of 100 million or greater in market capitalization. The index
is priced monthly.
 
SALOMON BROTHERS GNMA INDEX -- includes pools of mortgages originated by private
lenders and guaranteed by the mortgage pools of the Government National Mortgage
Association.
 
SALOMON BROTHERS HIGH-GRADE CORPORATE BOND INDEX -- consists of publicly issued,
non-convertible corporate bonds rated AA or AAA. It is a value-weighted, total
return index, including approximately 800 issues with maturities of 12 years or
greater.
 
LEHMAN BROTHERS AGGREGATE BOND INDEX -- is a market weighted index that contains
over 6,000 individually priced U.S. Treasury, agency, corporate, and mortgage
pass-through securities corporate rated BBB - or better. The Index has a market
value of over $4 trillion.
 
LEHMAN BROTHERS MUTUAL FUND SHORT (1-5) GOVERNMENT/CORPORATE INDEX -- is a
market weighted index that contains over 1,500 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 over 1,500 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 over 1,900 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.
 
SHEARSON 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 --
 
SHEARSON LEHMAN CORPORATE (BAA) BOND INDEX --
 
BOND BUYER MUNICIPAL INDEX (20 YEAR) BOND --
 
STANDARD & POOR'S PREFERRED INDEX --
 
NASDAQ INDUSTRIAL INDEX -- is composed of more than 3,000 industrial issues. It
is a value-weighted index calculated on price change only and does not include
income.
 
COMPOSITE INDEX -- 70% Standard & Poor's 500 Index and 30% NASDAQ Industrial
Index.
 
COMPOSITE INDEX -- 35% Standard & Poor's 500 Index and 65% Salomon Brothers High
Grade Bond Index.
 
COMPOSITE INDEX -- 65% Standard & Poor's 500 Index and 35% Salomon Brothers High
Grade Bond Index.
 
                                        5
<PAGE>   33
 
                                  TOTAL RETURN
 
  The average annual total return for the Fund for the year ended September 30,
1993 and for the period from inception (November 3, 1988) to September 30, 1993
was +15.4% and +14.6%, respectively.
  Total return is computed by determining 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.
                          INVESTMENT ADVISORY SERVICES
 
  The Fund employs Mellon Capital Management Corporation ("MCM"), 595 Market
St., Suite 3000, San Francisco, California (the "Adviser") under an investment
advisory agreement dated as of August 25, 1988 to manage the investment and
reinvestment of the assets of the Fund and to continuously review, supervise and
administer the Fund's investment program. The Adviser discharges its
responsibilities subject to the control of the officers and Directors of the
Fund.
  The Fund pays the Adviser a Basic fee at the end of each fiscal quarter,
calculated by applying a quarterly rate, based on the following annual
percentage rates, to the Fund's average month-end net assets for the quarter:
 
<TABLE>
<CAPTION>
                                        NET ASSETS            RATE
                              <S>                             <C>
                              First $100 million............  .20%
                              Over $100 million.............  .15%
</TABLE>
 
  This fee may be increased or decreased by applying an adjustment formula based
on the performance of the Fund's portfolio relative to the investment record of
the S&P 500 Index. The fee payment will be increased (decreased) by an incentive
(penalty) of 0.05% of average net assets, if the Fund's cumulative investment
performance for the thirty-six months preceding the end of the quarter is at
least six percentage points above (below) the cumulative investment record of
the S&P 500 Index for the same period.
  The agreement will continue until July 31, 1994 and will be renewable
thereafter for successive one year periods, only if each renewal is specifically
approved by a vote of the Fund's Board of Directors, including the affirmative
votes of a majority of the Trustees who are not parties to the contract or
"interested persons" (as defined in the Investment Company Act of 1940) of any
such party, cast in person at a meeting called for the purpose of considering
such approval. In addition, the question of continuance shall be effected only
if approved by the affirmative vote of a majority of the outstanding voting
securities of the Fund. The agreement is automatically terminated if assigned,
and may be terminated without penalty at any time (1) either by vote of the
Board of Directors of the Fund or by vote of its outstanding voting securities
on 60 days' written notice to the Adviser, or (2) by the Adviser upon 90 days'
written notice to the Fund.
  The Fund's Board of Directors may, without the approval of shareholders,
provide for:
     A. The employment of a new investment adviser pursuant to the terms of a
new advisory agreement, either as a replacement for an existing adviser or as an
additional adviser.
     B. A change in the terms of an advisory agreement.
     C. The continued employment of an existing adviser on the same advisory
contract terms where a contract has been assigned because of a change in control
of the adviser.
  Any such change will only be made upon not less than 30 days' prior written
notice to shareholders, which shall include the information concerning the
adviser that would have normally been included in a proxy statement.
  Because the Adviser provides only investment advisory services to the Fund and
has no control over the Fund's expenses, the Adviser has not undertaken to
guarantee expenses of the Fund. The officers of the Fund have worked out
alternative arrangements with state authorities which do require an expense
guarantee.
  DESCRIPTION OF THE ADVISER. The Adviser is a professional counseling firm
which manages well diversified stock and bond portfolios for institutional
clients. As of September 30, 1993 the Adviser provided investment advisory
services to 157 clients and managed assets with an approximate value of $34.3
billion. The Adviser's asset allocation strategy was developed by the Adviser's
Chairman, William Fouse, in 1972, and is used by 93 of its clients and accounts
for approximately $10.9 billion of the assets that it manages. The Adviser is a
wholly-owned subsidiary of MBC Investment Corporation, which itself is a
wholly-owned subsidiary of Mellon Bank Corporation. For the fiscal years ended
September 30, 1991, September 30, 1992, and September 30, 1993, the Fund paid
approximately $313,000 ($363,000 basic fee reduced by $50,000 for performance
adjustment), $629,000, and $1,224,000 ($1,176,000 basic fee increased by $48,000
for performance adjustment), respectively, to the Adviser for investment
advisory services.
 
                                        6
<PAGE>   34
 
                             PORTFOLIO TRANSACTIONS
 
  The investment advisory agreement authorizes the Adviser (with the approval of
the Fund's Board of Directors) to select the brokers or dealers that will
execute the purchases and sales of portfolio securities for the Fund and directs
the Adviser to use its best efforts to obtain the best available price and most
favorable execution as to all transactions for the Fund. The Adviser undertakes
to execute each investment transaction at a price and commission which provides
the most favorable total cost or proceeds reasonably obtainable under the
circumstances.
 
  In placing portfolio transactions, the Adviser will use its best judgment to
choose the broker most capable of providing the brokerage services necessary to
obtain best available price and most favorable execution. The full range and
quality of brokerage services available will be considered in making these
determinations. In those instances where it is reasonably determined that more
than one broker can offer the brokerage services needed to obtain the best
available price and most favorable execution, consideration may be given to
those brokers which supply investment research and statistical information and
provide other services in addition to execution services to the Fund and/or the
Adviser. The Adviser considers such information useful in the performance of its
obligations under the agreement, but is unable to determine the amount by which
such services may reduce its expenses.
 
  The investment advisory agreement also incorporates the concepts of Section
28(e) of the Securities Exchange Act of 1934 by providing that, subject to the
approval of the Fund's Board of Directors, the Adviser may cause the Fund to pay
a broker-dealer which furnishes brokerage and research services a higher
commission than that which might be charged by another broker-dealer for
effecting the same transaction; provided that such commission is deemed
reasonable in terms of either that particular transaction or the overall
responsibilities of the Adviser to the Fund.
 
  Currently, it is the Fund's policy that the Adviser may at times pay higher
commissions in recognition of brokerage services felt necessary for the
achievement of better execution of certain securities transactions that
otherwise might not be available. The Adviser will only pay such higher
commissions if it believes this to be in the best interest of the Fund. Some
brokers or dealers who may receive such higher commissions in recognition of
brokerage services related to execution of securities transactions are also
providers of research information to the Adviser and/or the Fund. However, the
Adviser has informed the Fund that it will not pay higher commission rates
specifically for the purpose of obtaining research services.
 
  Since the Fund does not market its shares through intermediary brokers or
dealers, it is not the Fund's practice to allocate brokerage or principal
business on the basis of sales of its shares which may be through such firms.
However, the Fund may place portfolio orders with qualified broker-dealers who
recommend the Fund to other clients, or who act as agent in the purchase of the
Fund's shares for their clients, and may, when a number of brokers and dealers
can provide comparable best price and execution on a particular transaction,
consider the sale of Fund shares by a broker or dealer in selecting among
qualified broker-dealers.
 
  The total brokerage commissions paid by the Fund for the fiscal years ended
September 30, 1991, September 30, 1992 and September 30, 1993, totaled $73,209,
$93,112 and $288,270, respectively.
 
  Some securities considered for investment by the Fund may also be appropriate
for other clients served by the Adviser. If purchases or sales of securities
consistent with the investment policies of the Fund and one or more of these
other clients serviced by the Adviser are considered at or about the same time,
transactions in such securities will be allocated among the Fund and such other
clients in a manner deemed equitable by the Adviser.
 
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.
 
                                        7
<PAGE>   35
 
  Some of the U.S. Government agencies that issue or guarantee securities
include the Export-Import Bank of the United States, Farmers Home
Administration, Federal Housing Administration, Maritime Administration, Small
Business Administration, and The Tennessee Valley Authority.
 
  An instrumentality of the U.S. Government is a government agency organized
under Federal charter with government supervision. Instrumentalities issuing or
guaranteeing securities include, among others, Federal Home Loan Banks, the
Federal Land Banks, Central Bank for Cooperatives, Federal Intermediate Credit
Banks, and the Federal National Mortgage Association.
 
DESCRIPTION OF REPURCHASE AGREEMENTS
 
  Repurchase agreements are transactions by which a person purchases a security
and simultaneously commits to resell that security to the seller (a member bank
of the Federal Reserve System or recognized securities dealer) at an agreed upon
price on an agreed upon date within a number of days (usually not more than
seven) from the date of purchase. The resale price reflects the purchase price
plus an agreed upon market rate of interest which is unrelated to the coupon
rate or maturity of the purchased security. A repurchase agreement involves the
obligation of the seller to pay the agreed upon price, which obligation is in
effect secured by the value of the underlying security.
 
  The use of repurchase agreements involves certain risks. For example, if the
seller of the agreement defaults on its obligation to repurchase the underlying
securities at a time when the value of these securities has declined, the
Portfolio may incur a loss upon disposition of them. If the seller of the
agreement becomes insolvent and subject to liquidation or reorganization under
the Bankruptcy Code or other laws, a bankruptcy court may determine that the
underlying securities are collateral not within the control of the Portfolio and
therefore subject to sale by the trustee in bankruptcy. Finally, it is possible
that the Portfolio may not be able to substantiate its interest in the
underlying securities. While the Fund's management acknowledges these risks, it
is expected that they can be controlled through stringent security selection
criteria and careful monitoring procedures.
 
                               FUTURES CONTRACTS
 
  The Fund may enter into stock index and fixed income futures contracts, stock
index and fixed income options, and options on such futures contracts to remain
fully invested, to reduce transactions costs. Futures contracts provide for the
future sale by one party and purchase by another party of a specified amount of
a specific security or index at a specified future time and at a specified
price. Futures contracts which are standardized as to maturity date and
underlying financial instrument are traded on national futures exchanges.
Futures exchanges and trading are regulated under the Commodity Exchange Act by
the Commodity Futures Trading Commission ("CFTC"), a U.S. Government Agency.
 
  Although many fixed income futures contracts call for actual delivery or
acceptance of the underlying securities at a specified date (stock index futures
contracts do not permit delivery of securities), the contracts are normally
closed out before the settlement date without the making or taking of delivery.
Closing out an open futures position is done by taking an opposite position
("buying" a contract which has previously been "sold," "selling" a contract
previously "purchased") in an identical contract to terminate the position.
Brokerage commissions are incurred when a futures contract is bought or sold.
 
  Futures traders are required to make a good faith margin deposit in cash or
government securities with a broker or custodian to initiate and maintain open
positions in futures contracts. A margin deposit is intended to assure
completion of the contract (delivery or acceptance of the underlying security)
if it is not terminated prior to the specified delivery date. Minimal initial
margin requirements are established by the futures exchange and may be changed.
Brokers may establish deposit requirements which are higher than the exchange
minimums.
 
  After a futures contract position is opened, the value of the contract is
marked to market daily. If the futures contract price changes to the extent that
the margin on deposit does not satisfy margin requirements, payment of
additional "variation" margin will be required. Conversely, change in the
contract value may reduce the required margin, resulting in a repayment of
excess margin to the contract holder. Variation margin payments are made to and
from the futures broker for as long as the contract remains open. The Fund
expects to earn interest income on its margin deposits.
 
  Traders in futures contracts may be broadly classified as either "hedgers" or
"speculators." Hedgers use the futures markets primarily to offset unfavorable
changes (anticipated or potential) in the value of securities currently owned or
expected to be acquired by them. Speculators are less inclined to own the
securities underlying the futures contracts
 
                                        8
<PAGE>   36
 
which they trade, and use futures contracts with the expectation of realizing
profits from fluctuations in the value of the underlying securities. The Fund
intends to use futures contracts only for bonafide hedging purposes.
 
  Regulations of the CFTC applicable to the Portfolio require that all of its
futures transactions constitute bonafide hedging transactions. The Portfolio
will only sell futures contracts to protect securities it owns against price
declines or purchase contracts to protect against an increase in the price of
securities it intends to purchase. As evidence of this hedging interest, the
Portfolio expects that approximately 75% of its futures contract purchases will
be "completed," that is, equivalent amounts of related securities will have been
purchased or are being purchased by the Fund upon sale of open futures
contracts.
 
RESTRICTIONS ON THE USE OF FUTURES CONTRACTS
 
  The Fund will not enter into futures contract transactions to the extent that,
immediately thereafter, the sum of its initial margin deposits on open contracts
exceeds 5% of the market value of the Portfolio's total assets.
 
RISK FACTORS IN FUTURES TRANSACTIONS
 
  Positions in futures may be closed out only on an Exchange which provides a
secondary market for such futures. However, there can be no assurance that a
liquid secondary market will exist for any particular futures contract at any
specific time. Thus, it may not be possible to close a futures position. In the
event of adverse price movements, the Fund would continue to be required to make
daily cash payments to maintain its required margin. In such situations, if the
Fund has insufficient cash, it may have to sell portfolio securities to meet
daily margin requirements at a time when it may be disadvantageous to do so. The
inability to close options and futures positions also could have an adverse
impact on the ability to effectively hedge.
 
  A Fund will minimize the risk that it will be unable to close out a futures
contract by only entering into futures which are traded on national futures
exchanges and for which there appears to be a liquid secondary market.
 
  The risk of loss in trading futures contracts in some strategies can be
substantial, due both to the low margin deposits required, and the extremely
high degree of leverage involved in futures contracts. As a result, a relatively
small price movement in a futures contract may result in immediate and
substantial loss (or gain) to the investor. For example, if at the time of
purchase, 10% of the value of the Futures Contract is deposited as margin, a
subsequent 10% decrease in the value of the futures contract would result in a
total loss of the margin deposit, before any deduction for the transaction
costs, if the account were then closed out. A 15% decrease would result in a
loss equal to 150% of the original margin deposit if the contract were closed
out. Thus, a purchase or sale of a futures contract may result in losses in
excess of the amount invested in the contract. The Fund also bears the risk that
the Adviser will incorrectly predict future market trends. However, because the
futures strategies of the Portfolio are engaged in only for hedging purposes,
the adviser does not believe that the Fund is subject to the risks of loss
frequently associated with futures transactions. The Fund would presumably have
sustained comparable losses if, instead of the futures contract, it had invested
in the underlying financial instrument and sold it after the decline.
 
  Utilization of futures transactions by the Fund does involve the risk of
imperfect or no correlation where the securities underlying futures contracts
have different maturities than the portfolio securities being hedged. It is also
possible that the Fund could both lose money on futures contracts and also
experience a decline in value of its portfolio securities. There is also the
risk of loss by the Fund of margin deposits in the event of bankruptcy of a
broker with whom the Fund has an open position in a futures contract or related
option.
 
  Most futures exchanges limit the amount of fluctuation permitted in some
futures contract prices during a single trading day. The daily limit establishes
the maximum amount that the price of a futures contract may vary either up or
down from the previous day's settlement price at the end of a trading session.
Once the daily limit has been reached in a particular type of contract, no
trades may be made on that day at a price beyond that limit. The daily limit
governs only price movement during a particular trading day and therefore does
not limit potential losses, because the limit may prevent the liquidation of
unfavorable positions. Futures contract prices have occasionally moved to the
daily limit for several consecutive trading days with little or no trading,
thereby preventing prompt liquidation of future positions and subjecting some
futures traders to substantial losses.
 
FEDERAL TAX TREATMENT OF FUTURES CONTRACTS
 
  Except for transactions the Fund has identified as hedging transactions, the
Fund is required for Federal income tax purposes to recognize as income for each
taxable year its net unrealized gains and losses on futures contracts as of the
end of the year as well as those actually realized during the year. In most
cases, any gain or loss recognized with respect
 
                                        9
<PAGE>   37
 
to a futures contract is considered to be 60% long-term capital gain or loss and
40% short-term capital gain or loss, without regard to the holding period of the
contract. Furthermore, sales of futures contracts which are intended to hedge
against a change in the value of securities held by the Fund may affect the
holding period of such securities and, consequently, the nature of the gain or
loss on such securities upon disposition.
 
  In order for the Fund to continue to qualify for Federal income tax treatment
as a regulated investment company, at least 90% of its gross income for a
taxable year must be derived from qualifying income; i.e., dividends, interest
income derived from loans of securities, and gains from the sale of securities
or foreign currencies, or other income derived with respect to its business of
investing in such securities or currencies. In addition, gains realized on the
sale or other disposition of securities held for less than three months must be
limited to less than 30% of the Fund's annual gross income. It is anticipated
that any net gain realized from the closing out of futures contracts will be
considered gain from the sale of securities and therefore be qualifying income
for purposes of the 90% requirement. In order to avoid realizing excessive gains
on securities held less than three months, the Fund may be required to defer the
closing out of futures contracts beyond the time when it would otherwise be
advantageous to do so. It is anticipated that unrealized gains on futures
contracts, which have been open for less than three months as of the end of the
Portfolio's fiscal year and which are recognized for tax purposes, will not be
considered gains on securities held less than three months for the purpose of
the 30% test.
 
  The Fund will distribute to shareholders annually any net capital gains which
have been recognized for Federal income tax purposes (including unrealized gains
at the end of the Portfolio's fiscal year) on futures transaction. Such
distributions will be combined with distributions of capital gains realized on
the Portfolio's other investments and shareholders will be advised on the nature
of the payments.
 
GLOSSARY
 
a. HISTORICAL MARKET RETURNS -- Total returns of broad asset class benchmarks.
   As examples, the returns of well-known benchmarks for domestic stocks, bonds,
   and money market instruments are given below.
 
<TABLE>
<CAPTION>
                                                                 MONEY MARKET
    ASSET CLASS      COMMON STOCKS             BONDS              INSTRUMENTS
    
                   STANDARD & POOR'S
                  500 COMPOSITE STOCK     LEHMAN BROTHERS           90 DAY
     BENCHMARK        PRICE INDEX       LONG TREASURY INDEX   U.S. TREASURY BILLS
    <S>           <C>                   <C>                   <C>
        1978               6.5%                 -1.4%                  7.1%
        1979              18.4                  -0.5                  10.0
        1980              32.4                  -2.9                  11.4
        1981              -4.9                   0.4                  14.7
        1982              21.5                  41.8                  10.9
        1983              22.5                   2.0                   9.0
        1984               6.2                  14.8                  10.0
        1985              31.6                  31.6                   7.8
        1986              18.6                  24.1                   6.2
        1987               5.2                  -2.7                   5.9
        1988              16.5                   9.2                   6.8
        1989              31.6                  18.9                   8.6
        1990              -3.1                   6.3                   7.9
        1991              30.3                  18.5                   5.8
        1992               7.6                   8.0                   3.6
        1993(9/30)         7.6                  19.1                   2.3
</TABLE>
 
b. ASSET ALLOCATION -- Asset allocation -- in its most generic sense -- is the
   allotment of an investor's monies to broad asset classes such as stocks or
   bonds. Investors establish percentage allocation guidelines for stocks,
   bonds, and money market instruments which are consistent with their
   particular long-term investment needs. These needs will include current
   income, potential growth in capital, and willingness to accept risk.
 
   In implementing their asset allocation targets, some investors attempt to
   maintain a stable mix -- such as 50% stocks and 50% bonds -- while others
   will actively manage the stock/bond mix in pursuit of higher returns, lower
   risk, or other investment objectives. The key difference between investors
   who maintain a stable mix and those who actively change allocations is their
   willingness to forecast the risks and returns of individual asset classes,
   their
 
                                       10
<PAGE>   38
 
   forecasting abilities, and their comfort in making investment decisions based
   upon such forecasts. Historically, investors who actively managed the mix
   based upon conjecture have often underperformed both investors with
   relatively stable allocations and investors with logical, disciplined methods
   for assessing relative value and risk. Institutional investors commonly refer
   to active asset allocation approaches which are based upon disciplined
   methodologies as tactical asset allocation.
 
                              FINANCIAL STATEMENTS
 
   
  The Fund's financial statements, including the financial highlights for each
of the four fiscal years ended September 30, 1993 and for the period from
November 3, 1988 (commencement of operations) through September 30, 1989,
appearing in the Fund's 1993 Annual Report to Shareholders and the report
thereon of Price Waterhouse, independent accountants, also appearing therein,
are incorporated by reference into this Statement of Additional Information. The
Fund's 1993 Annual Report to Shareholders is enclosed with this Statement of
Additional Information. For a more complete discussion of the Fund's
performance, please see the Fund's 1993 Annual Report to Shareholders, which can
be obtained without charge.
    
 
                                       11


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