VANGUARD EXPLORER FUND INC
497, 1996-07-31
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<PAGE>   1
 
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                   FORM N-1A
                   REGISTRATION STATEMENT (NO. 2-27203) UNDER
                           THE SECURITIES ACT OF 1933
                          PRE-EFFECTIVE AMENDMENT NO.
                        POST-EFFECTIVE AMENDMENT NO. 56
                                      AND
 
              REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY
                                  ACT OF 1940
                                AMENDMENT NO. 56
                          VANGUARD EXPLORER FUND, INC.
      (EXACT NAME OF REGISTRANT AS SPECIFIED IN ARTICLES OF INCORPORATION)
 
                     P.O. BOX 1100, VALLEY FORGE, PA 19482
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE)
 
                  REGISTRANT'S TELEPHONE NUMBER (610) 669-1000
 
                               CURTIS R. HILLIARD
                                  P.O. BOX 876
                             VALLEY FORGE, PA 19482
 
               IT IS PROPOSED THAT THIS FILING BECOME EFFECTIVE:
          on February 23, 1996, pursuant to paragraph (b) of Rule 485.
 
                 APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING:
  As soon as practicable after this Registration Statement becomes effective.
 
     THE REGISTRANT HAS REGISTERED AN INDEFINITE NUMBER OF SECURITIES UNDER THE
SECURITIES ACT OF 1933 PURSUANT TO RULE 24F-2 OF THE INVESTMENT COMPANY ACT OF
1940. REGISTRANT FILED ITS RULE 24F-2 NOTICE FOR ITS FISCAL YEAR ENDED OCTOBER
31, 1995, WITH THE COMMISSION ON NOVEMBER 17, 1995.
 
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<PAGE>   2
 
                          VANGUARD EXPLORER 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; Yield and Total
                                                               Return Disclosure
    Item 4.   General Description of Registrant.............   Investment Objective; Investment
                                                               Policies; General Information; Who
                                                               Should Invest; Investment
                                                               Limitations; Implementation of
                                                               Policies; Performance Record
    Item 5.   Management of the Fund........................   Management of the Fund; The Fund's
                                                               Investment Adviser
    Item 6.   Capital Stocks and Other Securities...........   Opening An Account and Purchasing
                                                               Shares; Selling Your Shares; The
                                                               Fund's Share Price; Dividends,
                                                               Capital Gains and Taxes; General
                                                               Information; When Your Account Will
                                                               Be Credited; Exchanging Shares;
                                                               Transferring Registration
    Item 7.   Purchase of Securities Being Offered..........   Cover Page; Opening An Account and
                                                               Purchasing Shares; Other Vanguard
                                                               Services; When Your Account Will Be
                                                               Credited; Exchanging Shares;
                                                               Transferring Registration
    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...............   Investment Objective and Policies
   Item 13.   Investment Objectives and Policies............   Investment Objective and Policies;
                                                               Investment Limitations
   Item 14.   Management of the Fund........................   Investment Advisory Services;
                                                               Directors and Officers
   Item 15.   Control Persons and Principal Holders of
              Securities....................................   Not Applicable
   Item 16.   Investment Advisory and Other Services........   Investment Advisory Services
   Item 17.   Brokerage Allocation..........................   Portfolio Transactions
   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; Financial Statements
   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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[VANGUARD EXPLORER FUND LOGO]            A Member of The Vanguard Group
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PROSPECTUS -- FEBRUARY 23, 1996; REVISED AUGUST 1, 1996
    
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NEW ACCOUNT INFORMATION: INVESTOR INFORMATION DEPARTMENT -- 1-800-662-7447
(SHIP)
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SHAREHOLDER ACCOUNT SERVICES: CLIENT SERVICES DEPARTMENT -- 1-800-662-2739
(CREW)
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INVESTMENT
OBJECTIVE AND
POLICIES              Vanguard Explorer Fund, Inc. (the "Fund") is an open-end
                      diversified investment company that seeks to provide
                      long-term growth in capital. The Fund invests primarily in
                      equity securities of small companies deemed to have
                      favorable prospects for growth in market value. Dividend
                      income is expected to be incidental to this objective.
                      There is no assurance that the Fund will achieve its
                      stated objective. Shares of the Fund are neither insured
                      nor guaranteed by any agency of the U.S. Government,
                      including the FDIC.
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OPENING AN
ACCOUNT               To open a regular (non-retirement) account, please
                      complete and return the Account Registration Form. If you
                      need assistance in completing this Form, please call the
                      Investor Information Department. To open an Individual
                      Retirement Account (IRA), please use a Vanguard IRA
                      Adoption Agreement. To obtain a copy of this form, call
                      1-800-662-7447, Monday through Friday, from 8:00 a.m. to
                      9:00 p.m. and Saturday, from 9:00 a.m. to 4:00 p.m.
                      (Eastern time). The minimum initial investment is $3,000
                      or $1,000 for Uniform Gifts/Transfers to Minors Act
                      accounts. The Fund is offered on a no-load basis (i.e.
                      there are no sales commissions or 12b-1 fees). However,
                      the Fund incurs expenses for investment advisory,
                      management, administrative, and distribution services.
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ABOUT THIS
PROSPECTUS            This Prospectus is designed to set forth concisely the
                      information you should know about the Fund before you
                      invest. It should be retained for future reference. A
                      "Statement of Additional Information" containing
                      additional information about the Fund has been filed with
                      the Securities and Exchange Commission. This Statement is
                      dated February 23, 1996; revised August 1, 1996, and has
                      been incorporated by reference into this Prospectus. A
                      copy may be obtained without charge by writing to the Fund
                      or by calling the Investor Information Department.
    
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TABLE OF CONTENTS
 
   
<TABLE>
<S>                              <C>      <C>                              <C>       <C>                              <C>
                                 Page                                       Page                                       Page
Fund Expenses ...................  2       Management of the Fund ..........  8      SHAREHOLDER GUIDE
Financial Highlights ............  2       Investment Advisers .............  9      Opening an Account and
Yield and Total Return ..........  3       Performance Record .............. 11      Purchasing Shares ................ 15
        FUND INFORMATION                   Dividends, Capital Gains and              When Your Account Will Be
Investment Objective ............  4       Taxes ........................... 12      Credited ......................... 18
Investment Policies .............  4       The Share Price of the                    Selling Your
Investment Risks ................  5       Fund ............................ 13      Shares ........................... 18
Who Should Invest ...............  6       General Information ............. 14      Exchanging Your Shares ........... 20
Implementation of Policies ......  6                                                 Important Information about
Investment Limitations ..........  8                                                 Telephone Transactions ........... 22
                                                                                     Transferring Registration ........ 22
                                                                                     Other Vanguard Services .......... 23
</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
 
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 1995 fiscal
                      year.
 
<TABLE>
                           <S>                                                             <C>       <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 Expenses.................................     0.36%
                           Investment Advisory Fees.............................................      0.28
                           12b-1 Fees...........................................................      None
                           Other Expenses
                             Distribution Costs........................................    0.02%
                             Miscellaneous Expenses....................................     0.02
                                                                                           -----
                           Total Other Expenses.................................................     0.04%
                                                                                                     -----
                                    TOTAL OPERATING EXPENSES....................................     0.68%
                                                                                                     -----
                                                                                                     -----
</TABLE>
 
                      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>
<CAPTION>
                        1 YEAR
                        ------       3 YEARS       5 YEARS       10 YEARS
                                     -------       -------       --------
                        <S>          <C>           <C>           <C>
                         $  7         $  22         $  38          $ 85
</TABLE>
 
                      THIS EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF
                      PAST OR FUTURE EXPENSES OR PERFORMANCE. ACTUAL EXPENSES
                      MAY BE HIGHER OR LOWER THAN THOSE SHOWN.
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FINANCIAL
HIGHLIGHTS            The following financial highlights for a share outstanding
                      throughout each year, insofar as they relate to each of
                      the five years in the period ended October 31, 1995, have
                      been audited by Price Waterhouse LLP, independent
                      accountants, whose report thereon was unqualified. This
                      information should be read in conjunction with the Fund's
                      financial statements and notes thereto which, together
                      with the remaining portions of the Fund's 1995 Annual
                      Report to Shareholders, are incorporated by reference in
                      the Statement of Additional Information and this
                      Prospectus, and which appear, along with the report of
                      Price Waterhouse LLP, in the Fund's 1995 Annual Report to
                      Shareholders. For a more complete discussion of the Fund's
                      performance, please see the Fund's 1995 Annual Report to
                      Shareholders, which may be obtained without charge by
                      writing to the Fund or by calling our Investor Information
                      Department at 1-800-662-7447.
 
                                        2
<PAGE>   5
 
<TABLE>
<CAPTION>
                                                                    YEAR ENDED OCTOBER 31,
                                    --------------------------------------------------------------------------------------
                              1995      1994      1993      1992      1991      1990      1989      1988      1987      1986
<S>                          <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>    
- ------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, BEGINNING
  OF YEAR..................  $45.99    $49.37    $41.23    $36.75    $22.62    $30.76    $29.64    $25.06    $31.59    $32.56
                             ------    ------    ------    ------    ------    ------    ------    ------    ------    ------
INVESTMENT OPERATIONS
  Net Investment Income....     .24       .16       .14       .15       .26       .31       .39       .27       .09       .02
  Net Realized and
    Unrealized Gain (Loss)
    on Investments.........    7.25      1.77      8.91      4.59     14.21     (7.07)     2.64      6.38     (3.33)      .63
                             ------    ------    ------    ------    ------    ------    ------    ------    ------    ------
    TOTAL FROM INVESTMENT
      OPERATIONS...........    7.49      1.93      9.05      4.74     14.47     (6.76)     3.03      6.65     (3.24)      .65
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DISTRIBUTIONS
  Dividends from Net
    Investment Income......    (.17)     (.14)     (.13)     (.26)     (.34)     (.37)     (.32)     (.11)     (.02)     (.33)
  Distributions from
    Realized Capital
    Gains..................   (2.26)    (5.17)     (.78)       --        --     (1.01)    (1.59)    (1.96)    (3.27)    (1.29)
                             ------    ------    ------    ------    ------    ------    ------    ------    ------    ------
    TOTAL DISTRIBUTIONS....   (2.43)    (5.31)     (.91)     (.26)     (.34)    (1.38)    (1.91)    (2.07)    (3.29)    (1.62)
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NET ASSET VALUE, END OF
  YEAR.....................  $51.05    $45.99    $49.37    $41.23    $36.75    $22.62    $30.76    $29.64    $25.06    $31.59
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TOTAL RETURN...............   17.46%     4.49%    22.28%    12.95%    64.64%   (22.92)%   10.95%    28.73%   (11.42)%    1.98%
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RATIOS/SUPPLEMENTAL DATA
Net Assets, End of Year
  (Millions)...............  $1,476    $1,112      $802      $519      $381      $207      $270      $266      $210      $272
Ratios of Expenses to
  Average Net Assets.......     .68%      .70%      .73%      .69%      .56%      .67%      .58%      .65%      .62%      .76%
Ratio of Net Investment
  Income to Average Net
  Assets...................     .52%      .39%      .32%      .38%      .85%     1.11%     1.24%      .99%      .28%      .05%
Portfolio Turnover Rate....      66%       82%       51%       43%       49%       46%       16%       28%        9%       15%
</TABLE>
 
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YIELD AND TOTAL
RETURN                From time to time the Fund may advertise its yield and
                      total return. Both yield and total return figures are
                      based on historical earnings and are not intended to
                      indicate future performance. The "total return" of the
                      Fund refers to the average annual compounded rates of
                      return over one-, five- and ten-year periods or over the
                      life of the Fund (as stated in the advertisement) that
                      would equate an initial amount invested at the beginning
                      of a stated period to the ending redeemable value of the
                      investment, assuming the reinvestment of all dividend and
                      capital gains distributions.
 
                      In accordance with industry guidelines set forth by the
                      U.S. Securities and Exchange Commission, 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 30 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 30-day yield may not fully
                      reflect the income paid to an investor's account or the
                      yield reported in the Fund's reports to shareholders.
                      Additionally, the Fund may compare its performance to that
                      of the unmanaged Russell 2000 Stock Index.
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                                        3
<PAGE>   6
 
INVESTMENT
OBJECTIVE
THE FUND SEEKS TO
PROVIDE LONG-TERM
CAPITAL GROWTH        The objective of the Fund is to provide long-term capital
                      growth by investing primarily in the equity securities of
                      small companies. Dividend income is expected to be
                      incidental to this objective. There is no assurance that
                      the Fund will achieve its stated objective.
 
                      The investment objective of the Fund is fundamental and so
                      cannot be changed without the approval of a majority of
                      the Fund's shareholders.
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INVESTMENT
POLICIES
THE FUND INVESTS IN
SMALL COMPANY STOCKS  The Fund invests primarily in the equity securities of
                      small companies which are deemed to offer favorable
                      prospects for growth in market value. These securities are
                      primarily common stocks but may also include securities
                      convertible into common stocks. The Fund is managed
                      without regard to tax ramifications.
 
                      Securities purchased by the Fund may be issued by small or
                      unseasoned companies with speculative risk
                      characteristics. Dividend income paid by such securities,
                      if any, will ordinarily be negligible. These securities
                      will generally be traded in established over-the-counter
                      markets, rather than on a national securities exchange.
 
                      The median market capitalization of the companies included
                      in the Fund -- that is, the median market value of the
                      companies' outstanding shares -- is expected to range from
                      $100 million to $500 million. By comparison, for companies
                      included in the Russell 2000 Stock Index, a benchmark of
                      the market for small company stocks, the median market
                      capitalization is approximately $430 million. The median
                      capitalization of companies in the Standard & Poor's 500
                      Composite Stock Price Index, a widely used measure of the
                      broad stock market, is approximately $17.2 billion.
 
   
                      In addition to investing in the equity securities of small
                      companies, the Fund may purchase stock futures contracts
                      and options to a limited extent, and may invest in certain
                      short-term fixed income securities. The Fund is also
                      authorized to invest, to a limited extent, in foreign and
                      restricted or illiquid securities. See "Implementation of
                      Policies" for a description of these and other investment
                      practices of the Fund.
    
 
                      The Fund is responsible for voting the shares of all
                      securities it holds.
 
                      These policies are not fundamental and therefore may be
                      changed by the Fund's Board of Directors without
                      shareholder approval. However, shareholders will be
                      notified prior to any material change in the Fund's
                      policies.
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                                        4
<PAGE>   7
 
INVESTMENT
RISKS
INVESTORS ARE EXPOSED
TO THE MARKET RISK OF
STOCKS                As a mutual fund investing primarily in common stocks, the
                      Fund is subject to MARKET RISK -- i.e., the possibility
                      that stock prices in general will decline over short or
                      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 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 1995, as measured by the Standard &
                      Poor's 500 Composite Stock Price Index:
 
<TABLE>
<CAPTION>
                          AVERAGE ANNUAL U.S. STOCK MARKET RETURNS (1926-1995)
                                       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      +12.5       +10.3       +10.7        +10.7
</TABLE>
 
                      As shown, common stocks have provided annual total returns
                      (capital appreciation plus dividend income) averaging
                      +10.7% for all 10-year periods from 1926 to 1995. The
                      return in individual years has varied from a low of -43.3%
                      to a high of +53.9%, reflecting the short-term volatility
                      of stock prices. Average returns may not be useful for
                      forecasting future returns in any particular period, as
                      stock returns are quite volatile from year to year.
 
SMALL COMPANY STOCKS
MAY EXHIBIT GREATER
VOLATILITY            Small company stocks, which are the Fund's primary
                      investments, have historically been more volatile in price
                      than the stock market as a whole. Among the likely reasons
                      for the greater price volatility of small company stocks
                      are the less certain growth prospects of smaller firms, a
                      low degree of liquidity in the markets for small company
                      stocks, and the small to negligible dividends generally
                      paid by small companies. Besides exhibiting greater
                      volatility, small company stocks have at times fluctuated
                      in value independently of the broad stock market.
 
                      Investors should therefore expect that small company
                      stocks (and hence the Fund's investments) may be more
                      volatile than the stocks of more established companies. In
                      addition, investors should recognize that small company
                      stocks may rise or fall in value independently of the
                      broad stock market.
 
THE FUND IS SUBJECT TO
MANAGER RISK          The investment adviser manages the Fund according to the
                      traditional methods of "active" investment management,
                      which involve the buying and selling of securities based
                      upon economic, financial and market analysis and
                      investment judgement. MANAGER RISK refers to the
                      possibility that the Fund's investment advisers may fail
                      to execute the Fund's investment strategy effectively. As
                      a result, the Fund may fail to achieve its stated
                      objective.
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                                        5
<PAGE>   8
 
WHO SHOULD
INVEST
INVESTORS SEEKING
LONG-TERM GROWTH      The Fund is intended for investors who have the
                      perspective, patience and financial ability to assume
                      above-average interim investment risks in pursuit of
                      long-term capital growth. Since a portion of the
                      securities the Fund owns may be considered speculative in
                      nature or unseasoned by traditional investment standards,
                      substantially greater-than-average investment risk is
                      involved. The Fund's share price is expected to be
                      volatile. Because of the risks associated with common
                      stock 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 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, either because of the
                      timing of the investment or previous excessive trading by
                      the investor. 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 attain its
                      objective or that shareholders will be protected from the
                      risk of loss that is inherent in equity investing.
                      Investors may wish to reduce the potential risk of
                      investing in the Fund by purchasing shares on a periodic
                      basis (dollar-cost averaging) rather than making an
                      investment in one lump sum.
 
                      The Fund is not intended as a complete investment program.
                      Most investors should maintain diversified holdings of
                      securities with different risk characteristics --
                      including common stocks, bonds and money market
                      instruments. Investors may also wish to complement an
                      investment in the Fund with other types of common stock
                      investments.
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IMPLEMENTATION
OF POLICIES           In addition to investing in the equity securities of small
                      companies, the Fund may use a number of other investment
                      vehicles to achieve its objective.
 
THE FUND MAY INVEST IN
FOREIGN AND RESTRICTED
OR ILLIQUID STOCKS    The Fund is authorized to invest up to 20% of its assets
                      in foreign securities and may engage in currency
                      transactions with respect to such investments. The Fund is
                      also authorized to invest up to 15% of its assets in
                      restricted or illiquid securities.
 
THE FUND MAY INVEST
IN SHORT-TERM FIXED
INCOME SECURITIES     Although it normally seeks to remain substantially
                      invested in equity securities, the Fund may invest for
                      temporary purposes in certain short-term fixed income
                      securities. Such securities may be used to invest
                      uncommitted cash balances, to maintain liquidity to meet
                      shareholder redemptions, or to take a temporarily
                      defensive position against potential stock market
                      declines. These securities include: obligations of the
                      United States Government and its agencies or
                      instrumentalities; commercial paper, bank certificates of
                      deposit, and bankers' acceptances; and repurchase
                      agreements collateralized by these securities.
 
                                        6
<PAGE>   9
 
THE FUND MAY LEND ITS
SECURITIES            The Fund may lend its investment securities to qualified
                      institutional 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
MONEY UNDER UNUSUAL
CIRCUMSTANCES         The Fund may borrow money, subject to the limits set forth
                      on page 8, for temporary or emergency purposes, including
                      the meeting of redemption requests which might otherwise
                      require the untimely disposition of securities.
 
PORTFOLIO TURNOVER WILL
NOT EXCEED 100%       Although it generally seeks to invest for the long term,
                      the Fund retains the right to sell securities irrespective
                      of how long they have been held. It is anticipated that
                      the annual portfolio turnover rate of the Fund will not
                      exceed 100%. A turnover rate of 100% would occur, for
                      example, if all of the securities of the Fund were
                      replaced within one year.
 
DERIVATIVE
INVESTING             Derivatives are instruments whose values are linked to or
                      derived from an underlying security or index. The most
                      common and conventional types of derivative securities are
                      futures and options.
 
THE FUND MAY INVEST
IN DERIVATIVE
SECURITIES            The Fund may invest in futures contracts and options, but
                      only to a limited extent. Specifically, the Fund may enter
                      into futures contracts 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 transactions only to the extent that obligations
                      under such contracts or transactions represent not more
                      than 20% of the Fund's assets.
 
                      Futures contracts and options may be used for several
                      common fund management strategies: to maintain cash
                      reserves while simulating full investment, to facilitate
                      trading, to reduce transaction costs, or to seek higher
                      investment returns when a specific futures contract is
                      priced more attractively than other futures contracts or
                      the underlying security or index.
 
                      The Fund may use futures contracts for bona fide "hedging"
                      purposes. In executing a hedge, a manager sells, for
                      example, stock index futures to protect against a decline
                      in the stock market. As such, if the market drops, the
                      value of the futures position will rise, thereby
                      offsetting the decline in value of the Fund's stock
                      holdings.
 
FUTURES CONTRACTS AND
OPTIONS POSE CERTAIN
RISKS                 The primary risks associated with the use of futures
                      contracts and options are: (i) imperfect correlation
                      between the change in market value of the stocks 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 in
                      those contracts whose price fluctuations are expected to
                      resemble those 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.
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                                        7
<PAGE>   10
 
INVESTMENT
LIMITATIONS
THE FUND HAS ADOPTED
CERTAIN FUNDAMENTAL
LIMITATIONS           The Fund has adopted certain limitations on its investment
                      practices. Specifically, the Fund will not:
 
                      (a)   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;
 
                      (b)   invest more than 25% of its assets in any one
                            industry; and
 
                      (c)   borrow money except from a bank (or through reverse
                            repurchase agreements) for temporary or emergency
                            (not leveraging) purposes, and then in an amount not
                            exceeding 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 net
                            assets, the Fund will not make any additional
                            investments.
 
                      These investment limitations are considered at the time
                      investment securities are purchased. The limitations
                      described here and in the Statement of Additional
                      Information may be changed only with the approval of a
                      majority of the Fund's shareholders.
- --------------------------------------------------------------------------------
 
MANAGEMENT OF
THE FUND
VANGUARD ADMINISTERS
AND DISTRIBUTES THE
FUND                  The Fund is a member of The Vanguard Group of Investment
                      Companies, a family of more than 30 investment companies
                      with more than 90 distinct investment portfolios and total
                      assets in excess of $180 billion. Through their
                      jointly-owned subsidiary, The Vanguard Group, Inc.
                      ("Vanguard"), the Fund and the other funds in the Group
                      obtain at cost virtually all of their corporate
                      management, administrative, shareholder accounting and
                      distribution services. Vanguard also provides investment
                      advisory services on an at-cost basis to certain Vanguard
                      funds. As a result of Vanguard's unique corporate
                      structure, the Vanguard funds have costs substantially
                      lower than those of most competing mutual funds. In 1995,
                      the average expense ratio (annual costs including advisory
                      fees divided by total net assets) for the Vanguard funds
                      amounted to approximately .31% compared to an average of
                      1.11% for the mutual fund industry (data provided by
                      Lipper Analytical Services).
 
                      The Officers of the Fund manage its day-to-day operations
                      and are responsible to the Fund's Directors. The Directors
                      set broad policies for the Fund and 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 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.
 
                                        8
<PAGE>   11
 
                      Vanguard also provides distribution and marketing services
                      to the Vanguard funds. The funds are available on a
                      no-load basis (i.e., there are no sales commissions or
                      12b-1 fees). However, each fund bears its share of the
                      Group's distribution costs.
- --------------------------------------------------------------------------------
 
INVESTMENT
ADVISERS
THE FUND EMPLOYS TWO
INVESTMENT MANAGERS   The Fund currently employs two investment advisers:
                      Wellington Management Company ("WMC"), 75 State Street,
                      Boston, MA 02109; and Granahan Investment Management, Inc.
                      ("Granahan"), 275 Wyman Street, Waltham, MA 02154.
 
                      The proportion of the net assets of the Fund managed by
                      each adviser is established by the Board of Directors, and
                      may be changed in the future as circumstances warrant.
                      Presently, WMC is responsible for approximately 44% of the
                      assets of the Fund, Granahan for approximately 43% of the
                      assets, and approximately 13%, the Fund's remaining net
                      assets, is held in cash. Because the Fund employs two
                      advisers it is possible that the advisers would purchase
                      or sell the same security at the same time. Such a
                      situation might result in increased brokerage costs or
                      adverse tax consequences to the Fund. The Board of
                      Directors monitors portfolio activity in order to minimize
                      any possible adverse consequences.
 
                      The Fund has entered into investment advisory agreements
                      with both WMC and Granahan which provide that both
                      advisers manage the investment and reinvestment of the
                      Fund's assets and continuously review, supervise and
                      administer the Fund's investment program. The advisers
                      discharge their responsibilities subject to the control of
                      the Officers and Directors of the Fund.
 
                      WMC is a professional investment advisory firm which
                      globally provides services to investment companies, other
                      institutions and individuals. Among the clients of WMC are
                      more than 10 investment companies of The Vanguard Group.
                      As of December 31, 1995, WMC held investment management
                      authority with respect to more than $108 billion of
                      assets. WMC and its predecessor organizations have
                      provided investment advisory services to investment
                      companies since 1933 and to investment counseling clients
                      since 1960.
 
                      Kenneth L. Abrams, Vice President of WMC, serves as
                      portfolio manager of the assets of the Fund assigned to
                      WMC. Mr. Abrams has been employed by WMC for 9 years and
                      has served as portfolio manager for the Fund since
                      February of 1994. In managing the assets of the Fund
                      assigned to WMC, Mr. Abrams is supported by research and
                      other investment services provided by the professional
                      staff of WMC.
 
   
                      The Fund pays WMC an advisory fee at the end of each
                      fiscal quarter, calculated by applying a quarterly rate,
                      based on the following annual percentage rates, to the
                      average month-end net assets of the Fund managed by WMC
                      for the quarter:
    
 
   
<TABLE>
<CAPTION>
                                  NET ASSETS               RATE
                        -------------------------------    -----
                        <S>                                <C>
                        First $500 million                 .250%
                        Next $250 million                  .200%
                        Next $250 million                  .150%
                        Assets in excess of $1 billion     .100%
</TABLE>
    
 
   
                      This basic advisory fee may be increased or decreased by
                      up to 50% by applying an adjustment formula
                      ("incentive/penalty fee") based on the investment
                      performance
    
 
                                        9
<PAGE>   12
 
   
                      of the portion of the Fund managed by WMC relative to the
                      investment record of the Russell 2000 Small Stock Index
                      (the "Russell 2000"), an index of small capitalization
                      common stocks.
    
 
   
                      Under the rules of the Securities and Exchange Commission,
                      the new incentive/penalty fee will not be fully operable
                      until the quarter ending July 31, 1999. Until that date, a
                      "blended" fee rate consisting of varying percentages of
                      (i) the performance adjustment based on the schedule set
                      forth in the Statement of Additional Information, and (ii)
                      the performance adjustment based on the schedule set forth
                      in Explorer Fund's previous investment advisory agreement
                      with the WMC shall be used. Please see Statement of
                      Additional Information for more information on this
                      transition period.
    
 
                      Granahan is a professional investment advisory firm
                      founded in 1985. As of December 31, 1995, Granahan held
                      discretionary management authority with respect to
                      approximately $813 million in assets. John J. Granahan is
                      portfolio manager of the assets of the Fund assigned to
                      Granahan. Mr. Granahan served as portfolio manager of
                      Explorer II from its inception in June 1985 through its
                      merger with the Fund in February 1990. He also served as
                      portfolio manager of Explorer Fund from January 1972 to
                      September 1979 while employed at WMC.
 
   
                      The Fund pays Granahan an advisory 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 $500 million                 .300%
                        Next $250 million                  .200%
                        Next $250 million                  .150%
                        Assets in excess of $1 billion     .100%
</TABLE>
    
 
   
                      This basic advisory fee may be increased or decreased by
                      applying an adjustment formula ("incentive/penalty fee")
                      based on the investment performance of the portion of the
                      Fund managed by Granahan relative to the Russell 2000, an
                      index of small capitalization common stocks.
    
 
   
                      For the fiscal year ended October 31, 1995, the aggregate
                      investment advisory fees paid by the Fund to WMC and
                      Granahan represented an effective annual base rate of .27
                      of 1% of average net assets before an increase of $25,000
                      based on performance. The investment advisory fees paid by
                      the Fund for this period to WMC represented an effective
                      annual rate of .28 of 1% of the average net assets managed
                      by WMC and the investment advisory fees paid to Granahan
                      represented an effective annual rate of .30 of 1% of the
                      average net assets managed by Granahan. These fees were
                      paid under a previous fee schedule that provided for a
                      higher rate of fees.
    
 
                      The investment advisory agreements with WMC and Granahan
                      authorize the advisers to select brokers or dealers to
                      execute purchases and sales of the Fund's portfolio
                      securities, and direct the advisers to use their best
                      efforts to obtain the best available price and most
                      favorable execution with respect to all transactions. The
 
                                       10
<PAGE>   13
 
                      full range and quality of brokerage services available are
                      considered in making these determinations.
 
                      The Fund has authorized WMC and Granahan to pay higher
                      commissions in recognition of brokerage services felt
                      necessary for the achievement of better execution,
                      provided the advisers believe 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
RECORD                The table in this section provides investment results for
                      the Fund over several periods. The results represent the
                      Fund's "total return" investment performance, which
                      assumes the reinvestment of all capital gains and income
                      dividends for the indicated periods. Also included is
                      comparative information on the unmanaged Standard & Poor's
                      500 Composite Stock Price Index, a widely used barometer
                      of stock market activity; the Russell 2000 Stock Index, an
                      index of small company stocks; and the Consumer Price
                      Index, a statistical measure of changes in the prices of
                      goods and services. The table does not make any allowance
                      for federal, state or local income taxes, which
                      shareholders must pay on a current basis.
 
                      The results shown 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.
 
<TABLE>
<CAPTION>
                                                        ANNUAL AVERAGE PERCENTAGE CHANGE
                             FISCAL             EXPLORER     S&P 500     RUSSELL      CONSUMER
                             ENDED 10/31/95       FUND        INDEX       2000       PRICE INDEX
                             --------------     --------     -------     -------     -----------
                             <S>                <C>          <C>         <C>         <C>
                             3 Years              +14.5%      +14.7 %      +16.0%        +2.7%
                             5 Years              +22.8       +17.2        +22.1         +2.8
                             10 Years             +10.7       +15.4        +11.8         +3.5
                             Lifetime*            + 9.0       +10.9          N/A         +5.6
                             *December 11, 1967, to October 31, 1995. Data for the Consumer
                              Price Index begins December 31, 1967.
</TABLE>
 
- --------------------------------------------------------------------------------
 
                                       11
<PAGE>   14
 
DIVIDENDS,
CAPITAL GAINS
AND TAXES
THE FUND DISTRIBUTES
DIVIDENDS AND CAPITAL
GAINS ANNUALLY        The Fund expects to pay dividends annually from ordinary
                      income. Net capital gains distributions, if any, will be
                      made annually.
 
                      In addition, in order to satisfy certain distribution
                      requirements of the Tax Reform Act of 1986, the Fund may
                      declare special year-end dividend and capital gains
                      distributions during December. Such distributions, if
                      received by shareholders by January 31, are deemed to have
                      been paid by the Fund and received by shareholders on
                      December 31 of the prior year.
 
                      Dividend and capital gains distributions may be
                      automatically reinvested or received in cash. See
                      "Choosing a Distribution Option" for a description of
                      these 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,
                      whether received in cash or reinvested in additional
                      shares, will be taxable to shareholders as ordinary
                      income.
 
                      For corporate investors, dividends from net investment
                      income will 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 by-product 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 elect to receive 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 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
                      its dividend and capital gains distributions.
 
A CAPITAL GAIN OR LOSS
MAY BE REALIZED UPON
EXCHANGE OR
REDEMPTION            A sale of shares of the Fund is a taxable event and may
                      result in a capital gain or loss. A capital gain or loss
                      may be realized from an ordinary redemption of shares or
                      an exchange of shares between two mutual funds (or two
                      portfolios of a mutual fund).
 
                                       12
<PAGE>   15
 
                      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 SHARE PRICE
OF THE FUND           The Fund's share price or "net asset value" per share is
                      determined by dividing the total assets of the Fund, less
                      all liabilities, by the total number of shares
                      outstanding. The net asset value is calculated at the
                      close of regular trading (generally 4:00 p.m. Eastern
                      time) each day the New York Stock Exchange is open for
                      trading.
 
                      Portfolio securities that are listed on an exchange are
                      valued at the latest quoted sales prices. Securities not
                      traded on the valuation date are valued at the mean of the
                      latest quoted bid and asked prices. Securities not listed
                      on an exchange are valued at the latest quoted bid price.
                      Short-term instruments (those with remaining maturities of
                      60 days or less) are valued at cost, plus or minus any
                      amortized discount or premium, which approximates market
                      values. The Fund values foreign securities using the
                      latest quoted share price or, if necessary, the security's
                      broadest and most representative market value. All prices
                      of listed securities are taken from the exchange where the
                      security is primarily traded. 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 securities. The prices provided by a pricing
                      service may be determined without regard to bid or last
                      sale prices of each security but take into account
                      institutional-size transactions in similar groups of
                      securities as well as any developments related to specific
                      securities. Other assets and securities for which market
                      quotations are not readily available or which are
                      restricted as to sale are valued by such methods as the
                      Board of Directors deems in good faith to reflect fair
                      value.
 
                      The Fund's price per share can be found daily in the
                      mutual fund section of most major newspapers under the
                      heading of Vanguard.
- --------------------------------------------------------------------------------
 
                                       13
<PAGE>   16
 
GENERAL
INFORMATION           Vanguard Explorer Fund, Inc. is a Maryland corporation. On
                      February 28, 1990, the Fund acquired the assets of
                      Explorer II, Inc., an investment company that was a member
                      of The Vanguard Group and that had investment objectives
                      and policies similar to those of the Fund. Also, on that
                      date the Fund retained Granahan Investment Management
                      Inc., the original investment adviser to Explorer II,
                      Inc., as an additional investment adviser.
 
                      The authorized capital stock of the Fund consists of
                      100,000,000 shares at the par value of $.001 each. The
                      Board of Directors has the power to designate one or more
                      classes ("Portfolios") of shares of common stock and to
                      classify or reclassify any unissued shares with respect to
                      such Portfolios. Currently the Fund is offering one class
                      of shares.
 
                      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 Fund.
 
                      The shares of the Fund are fully paid and nonassessable;
                      have no preferences as to conversion, exchange, dividends,
                      retirement or other features; and have no pre-emptive
                      rights. Such shares have noncumulative 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.
 
                      All securities and cash are held by State Street Bank and
                      Trust Company, Boston, MA. CoreStates Bank, N.A., holds
                      daily cash balances of the Fund which are used to invest
                      in repurchase agreements or securities acquired in these
                      transactions. The Vanguard Group, Inc., Valley Forge, PA,
                      serves as the Fund's Transfer and Dividend Disbursing
                      Agent. Price Waterhouse LLP, serves as independent
                      accountants for the Fund and audits its financial
                      statements annually. The Fund is not involved in any
                      litigation.
- --------------------------------------------------------------------------------
 
                                       14
<PAGE>   17
 
                               SHAREHOLDER GUIDE
 
OPENING AN
ACCOUNT AND
PURCHASING
SHARES                You may open a regular (non-retirement) account, either by
                      mail or wire. Simply complete and return an Account
                      Registration Form and any required legal documentation,
                      indicating the amount you wish to invest. Your purchase
                      must be equal to or greater than the $3,000 minimum
                      initial investment requirement ($1,000 for Uniform
                      Gifts/Transfers to Minors Act accounts). You must open a
                      new Individual Retirement Account by mail (IRAs may not be
                      opened by wire) using a Vanguard IRA Adoption Agreement.
                      Your purchase must be equal to or greater than the $1,000
                      minimum initial investment requirement, but no more than
                      $2,000 if you are making a regular IRA contribution.
                      Rollover contributions are generally limited to the amount
                      withdrawn within the past 60 days from an IRA or other
                      qualified Retirement Plan. If you need assistance with the
                      forms or have any questions about this Fund, please call
                      our Investor Information Department at 1-800-662-7447.
                      Note: For other types of account registrations (e.g.,
                      corporations, associations, other organizations, trusts or
                      powers 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).
 
PURCHASE
RESTRICTIONS          1) Because of the risks associated with common stock
                         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 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.
 
                      2) Vanguard will not accept third-party checks to purchase
                         shares of the Fund. Please be sure your purchase check
                         is made payable to The Vanguard Group.
 
ADDITIONAL
INVESTMENTS           Subsequent investments to regular accounts may be made by
                      mail ($100 minimum), wire ($1,000 minimum), exchange from
                      another Vanguard Fund account, or Vanguard Fund Express.
                      Subsequent investments to Individual Retirement Accounts
                      may be made by mail ($100 minimum) or exchange from
                      another Vanguard Fund account. In some instances,
                      contributions may be made by wire or Vanguard Fund
                      Express. Please call us for more information on these
                      options.
- --------------------------------------------------------------------------------
 
                                       15
<PAGE>   18
 
<TABLE>
<S>                       <C>                                       <C>
                                                                    ADDITIONAL INVESTMENTS
                          NEW ACCOUNT                               TO EXISTING ACCOUNTS
PURCHASING BY MAIL        Please include the amount of              Additional investments should
Complete and sign the     your initial investment on the            include the Invest-by-Mail
enclosed Account          registration form, make your              remittance form attached to your
Registration Form         check payable to The Vanguard             Fund confirmation statements.
                          Group-24, and mail to:                    Please make your check payable
                                                                    to The Vanguard Group-24, write
                          VANGUARD FINANCIAL CENTER                 your account number on your
                          P.O. BOX 2600                             check and, using the return
                          VALLEY FORGE, PA 19482                    envelope provided, mail to the
                                                                    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.
                          --------------------------------------------------------------------------------------
PURCHASING BY WIRE                          CORESTATES BANK, N.A.
Money should be                             ABA 031000011
wired to:                                   CORESTATES NO. 0101 9897
                                            ATTN VANGUARD
BEFORE WIRING                               VANGUARD EXPLORER FUND
Please contact                              ACCOUNT NUMBER
Client Services                             ACCOUNT REGISTRATION
(1-800-662-2739)
</TABLE>
 
                      To assure proper receipt, please be sure your bank
                      includes the name of the Fund selected, 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 above after completing your
                      wire arrangement. Note: Federal Funds wire purchase orders
                      will be accepted only when the Fund and Custodian Bank are
                      open for business.
- --------------------------------------------------------------------------------
 
PURCHASING BY
EXCHANGE (from a
Vanguard account)     You may open a new account or purchase additional shares
                      by making an exchange from an existing Vanguard Fund
                      account. However, the Fund reserves the right to refuse
                      any exchange purchase request. Call our Client Services
                      Department at 1-800-662-2739 for more information. The new
                      account will have the same registration as the existing
                      account.
- --------------------------------------------------------------------------------
 
PURCHASING BY
FUND EXPRESS
Special Purchase and
Automatic Investment  The Fund Express Special Purchase option lets you move
                      money from your bank account to your Vanguard account on
                      an "as needed" basis. Or if you choose the Automatic
                      Investment option, money will be moved automatically from
                      your bank account to your Vanguard account on the schedule
                      (monthly, bimonthly [every other month], quarterly or
                      yearly) you select. To establish these Fund Express
                      options, please provide the appropriate information on the
                      Account Registration
 
                                       16
<PAGE>   19
 
                      Form. We will send you a confirmation of your Fund Express
                      service; please wait three weeks before using the service.
- --------------------------------------------------------------------------------
 
CHOOSING A
DISTRIBUTION
OPTION                You must select one of three distribution options:
 
                      1. AUTOMATIC REINVESTMENT OPTION -- Both dividends and
                         capital gains distributions will be reinvested in
                         additional Fund shares. This option will be selected
                         for you automatically unless you specify 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).
 
                      In addition, an option to invest your cash dividends
                      and/or capital gains distributions in another Vanguard
                      Fund account is available. Please call our Client Services
                      Department (1-800-662-2739) for information. You may also
                      elect Vanguard Dividend Express which allows you to
                      transfer your cash dividends and/or capital gains
                      distributions automatically to your bank account. Please
                      see "Other Vanguard Services" for more information.
- --------------------------------------------------------------------------------
 
TAX CAUTION
INVESTORS SHOULD ASK
ABOUT THE TIMING OF
CAPITAL GAINS AND
DIVIDEND DISTRIBUTIONS
BEFORE INVESTING      Under Federal tax laws, the Fund is required to distribute
                      net capital gains and dividend income to Fund
                      shareholders. These distributions are made to all
                      shareholders who own Fund shares as of the distribution's
                      record date, regardless of how long the shares have been
                      owned. Purchasing shares just prior to the record date
                      could have a significant impact on your tax liability for
                      the year. For example, if you purchase shares immediately
                      prior to the record date of a sizable capital gain or
                      income dividend distribution, you will be assessed taxes
                      on the amount of the capital gain and/or dividend
                      distribution later paid even though you owned the Fund
                      shares for just a short period of time. (Taxes are due on
                      the distributions even if the dividend or gain is
                      reinvested in additional Fund shares.) While the total
                      value of your investment will be the same after the
                      distribution -- the amount of the distribution will offset
                      the drop in the net asset value of the shares -- you
                      should be aware of the tax implications the timing of your
                      purchase may have.
 
                      Prospective investors should, therefore, inquire about
                      potential distributions before investing. The Fund's
                      annual dividend and capital gains distributions normally
                      occur in December. For additional information on
                      distributions and taxes, see the section titled
                      "Dividends, Capital Gains and Taxes."
- --------------------------------------------------------------------------------
 
                                       17
<PAGE>   20
 
IMPORTANT
ACCOUNT
INFORMATION
OPTIONAL SERVICES     The easiest way to establish optional Vanguard services on
                      your account is to select the options you desire when you
                      complete your Account Registration Form. IF YOU WISH TO
                      ESTABLISH ADDITIONAL SHAREHOLDER OPTIONS FOR YOUR ACCOUNT,
                      YOU MAY NEED TO PROVIDE VANGUARD WITH ADDITIONAL
                      INFORMATION AND A SIGNATURE GUARANTEE. PLEASE CALL OUR
                      CLIENT SERVICES DEPARTMENT (1-800-662-2739) FOR FURTHER
                      ASSISTANCE.
 
SIGNATURE GUARANTEES  For our mutual protection, we may require a signature
                      guarantee on certain written transaction requests. A
                      signature guarantee verifies the authenticity of your
                      signature and may be obtained from banks, brokers and any
                      other guarantor that Vanguard deems acceptable. A
                      SIGNATURE GUARANTEE CANNOT BE PROVIDED BY A NOTARY PUBLIC.
 
CERTIFICATES          Share certificates will be issued upon request. If a
                      certificate is lost, you may incur an expense to replace
                      it.
 
BROKER/DEALER
PURCHASES             If you purchase shares in Vanguard Funds through a
                      registered broker-dealer or investment adviser, the
                      broker-dealer or adviser may charge a service fee.
 
CANCELLING TRADES     The Fund will not cancel any trade (e.g., purchase,
                      redemption or exchange) believed to be authentic, received
                      in writing or by telephone, once the trade has been
                      received.
 
ELECTRONIC
PROSPECTUS
DELIVERY              If you would prefer to receive a prospectus for the Fund
                      or any of the Vanguard Funds in an electronic format,
                      please call 1-800-231-7870 for additional information. If
                      you elect to do so, you may also receive a paper copy of
                      the prospectus by calling 1-800-662-7447.
- --------------------------------------------------------------------------------
 
WHEN YOUR
ACCOUNT WILL BE
CREDITED              Your trade date is the date on which your account is
                      credited. If your purchase is made by check, Federal Funds
                      wire, or exchange, and is received by the regular close of
                      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. The name of the U.S. correspondent
                      bank must be printed on the face of the foreign check.
- --------------------------------------------------------------------------------
 
SELLING YOUR
SHARES                You may withdraw any portion of the funds in your account
                      by redeeming shares at any time (see Important Redemption
                      Information). You generally may initiate a 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.
 
                                       18
<PAGE>   21
 
SELLING BY MAIL       Requests should be mailed to VANGUARD FINANCIAL CENTER,
                      VANGUARD EXPLORER FUND, P.O. BOX 1120, VALLEY FORGE, PA
                      19482. (For express or registered mail, send your request
                      to Vanguard Financial Center, Vanguard Explorer 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            GOOD ORDER means that the request includes the following:
 
                      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.
                      6. Any certificates that you hold for the account.
 
                      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.
                      PLEASE NOTE: As a protection against fraud, your telephone
                      mail redemption privilege will be suspended for 15
                      calendar days following any expedited address change to
                      your account. An expedited address change is one that is
                      made by telephone, by Vanguard Online or, in writing,
                      without the signatures of all account owners. Please see
                      "Important Information About Telephone Transactions."
    
- --------------------------------------------------------------------------------
 
SELLING BY
FUND EXPRESS
Automatic Withdrawal
& Special Redemption  With the Fund Express Automatic Withdrawal option, money
                      will be automatically moved from your Vanguard Fund
                      account to your bank account according to the schedule you
                      have selected. The Special Redemption option lets you move
                      money from your Vanguard account to your bank account on
                      an "as needed" basis. To establish these Fund Express
                      options, please provide the appropriate information on the
                      Account Registration Form. We will send you a confirmation
                      of your Fund Express service; please wait three weeks
                      before using the service.
- --------------------------------------------------------------------------------
 
SELLING BY EXCHANGE   You may sell shares of the Fund by making an exchange into
                      another Vanguard Fund account. Please see "Exchanging Your
                      Shares" for details.
- --------------------------------------------------------------------------------
 
IMPORTANT
REDEMPTION
INFORMATION           Shares purchased by check or Fund Express may be redeemed
                      at any time. However, your redemption proceeds will not be
                      paid until payment for the purchase is collected, which
                      may take up to ten calendar days.
- --------------------------------------------------------------------------------
 
DELIVERY OF
REDEMPTION PROCEEDS   Redemption requests received by telephone prior to the
                      regular close of the New York Stock Exchange (generally,
                      4:00 p.m. Eastern time), are processed on the day of
                      receipt and the redemption proceeds are normally sent on
                      the following business day.
 
                                       19
<PAGE>   22
 
                      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.
 
                      All unpaid dividend and capital gains distributions
                      credited to your account up to the date of redemption will
                      be included in the redemption check. Redemption proceeds
                      must be sent to you within seven days of receipt of your
                      request in Good Order, except as otherwise provided above
                      in "Important Redemption Information."
 
                      If you experience difficulty in making a telephone
                      redemption during periods of drastic economic or market
                      changes, your redemption request may be made by regular or
                      express mail. It will be implemented at the net asset
                      value next determined after your request has been received
                      by Vanguard in Good Order. The Fund reserves the right to
                      revise or terminate the telephone redemption privilege at
                      any time.
 
                      The Fund may suspend the redemption right or postpone
                      payment at times when the New York Stock Exchange is
                      closed, or under any emergency circumstances as determined
                      by the United States Securities and Exchange Commission.
 
                      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
COST STATEMENT        If you make a redemption from a qualifying account,
                      Vanguard will send you an Average Cost Statement which
                      provides you with the tax basis of the shares you
                      redeemed. Please see "Statements and Reports" for
                      additional information.
- --------------------------------------------------------------------------------
 
   
LOW BALANCE FEE AND
MINIMUM ACCOUNT
BALANCE REQUIREMENT   Due to the relatively high cost of maintaining smaller
                      accounts, the Fund will automatically deduct a $10 annual
                      fee from non-retirement accounts with balances falling
                      below $2,500 ($500 for Uniform Gifts/Transfers to Minors
                      Act accounts). This fee deduction will occur mid-year,
                      beginning in 1996. The fee generally will be waived for
                      investors whose aggregate Vanguard assets exceed $50,000.
    
 
                      In addition, the Fund reserves the right to liquidate any
                      non-retirement account that is below the minimum initial
                      investment amount of $3,000. If at any time the total
                      investment does not have a value of at least $3,000, you
                      may be notified that your account is below the Fund's
                      minimum account balance requirement. You would then be
                      allowed 60 days to make an additional investment before
                      the account is liquidated. Proceeds would be promptly paid
                      to the shareholder.
 
                      Vanguard will not liquidate your account if it has fallen
                      below $3,000 solely as a result of declining markets
                      (i.e., a decline in a Fund's net asset value.)
- --------------------------------------------------------------------------------
 
EXCHANGING YOUR
SHARES                Should your investment goals change, you may exchange your
                      shares of Vanguard Explorer Fund for those of other
                      available Vanguard Funds. Exchanges to or from Vanguard
                      Explorer Fund may be made by mail or by telephone.
- --------------------------------------------------------------------------------
 
                                       20
<PAGE>   23
 
EXCHANGING BY
TELEPHONE
Call Client Services
(1-800-662-2739)      When exchanging shares by telephone, please have ready the
                      Fund name, account number, Social Security number or
                      Employer Identification number listed on the account, and
                      the exact name and address in which the account is
                      registered. Requests for telephone exchanges received
                      prior to the close of trading on the New York Stock
                      Exchange (generally 4:00 p.m. Eastern time) are processed
                      at the close of business that same day. Requests received
                      after the close of regular trading on the Exchange are
                      processed the next business day. TELEPHONE EXCHANGES ARE
                      NOT ACCEPTED INTO OR FROM VANGUARD BALANCED INDEX FUND,
                      VANGUARD INDEX TRUST, VANGUARD INTERNATIONAL EQUITY INDEX
                      FUND AND VANGUARD QUANTITATIVE PORTFOLIOS. If you
                      experience difficulty in making a telephone exchange, your
                      exchange request may be made by regular or express mail,
                      and it will be implemented at the closing net asset value
                      on the date received by Vanguard provided the request is
                      received in Good Order.
- --------------------------------------------------------------------------------
 
EXCHANGING BY MAIL    Please be sure to include on your exchange request the
                      name and account number of your current Fund, the name of
                      the Fund you wish to exchange into, the amount you wish to
                      exchange, and the signatures of all registered account
                      holders. Send your request to VANGUARD FINANCIAL CENTER,
                      VANGUARD EXPLORER FUND, P.O. BOX 1120, VALLEY FORGE, PA
                      19482. (For express or registered mail, send your request
                      to Vanguard Financial Center, Vanguard Explorer Fund, 455
                      Devon Park Drive, Wayne, PA 19087.)
- --------------------------------------------------------------------------------
 
IMPORTANT EXCHANGE
INFORMATION           Before you make an exchange, you should consider the
                      following:
 
                      - Please read the Fund's prospectus before making an
                        exchange. For a copy and for answers to any questions
                        you may have, call our Investor Information Department
                        (1-800-662-7447).
 
                      - 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 or Vanguard/PRIMECAP 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 and limit the amount of or
                      reject any exchange, as deemed necessary, at any time.
 
                                       21
<PAGE>   24
 
                      The exchange privilege is only available in states in
                      which the shares of the Fund are registered for sale. The
                      Fund's shares are currently registered for sale in all 50
                      states and the Fund intends to maintain such registration.
- --------------------------------------------------------------------------------
 
EXCHANGE
PRIVILEGE
LIMITATIONS           The Fund's exchange privilege is not intended to afford
                      shareholders a way to speculate on short-term movements in
                      the market. Accordingly, in order to prevent excessive use
                      of the exchange privilege that may potentially disrupt the
                      management 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 twelve
                      month period. Notwithstanding these limitations, 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.
- --------------------------------------------------------------------------------
 
IMPORTANT
INFORMATION
ABOUT TELEPHONE
TRANSACTIONS          The ability to initiate redemptions (except wire
                      redemptions) and exchanges by telephone is automatically
                      established on your account unless you request in writing
                      that telephone transactions on your account not be
                      permitted.
 
                      To protect your account from losses resulting from
                      unauthorized or fraudulent telephone instructions,
                      Vanguard adheres to the following security procedures:
 
                      1. SECURITY CHECK.  To request a transaction by telephone,
                         the caller must know (i) the name of the Portfolio;
                         (ii) the 10-digit account number; (iii) the exact name
                         and address used in the registration; and (iv) the
                         Social Security or Taxpayer Identification number
                         listed on the account.
 
                      2. PAYMENT POLICY.  The proceeds of any telephone
                         redemption made by mail will be made payable to the
                         registered shareowner and mailed to the address of
                         record, only.
 
                      Neither the Fund nor Vanguard will be responsible for the
                      authenticity of transaction instructions received by
                      telephone, provided that reasonable security procedures
                      have been followed. Vanguard believes that the security
                      procedures described above are reasonable, and that if
                      such procedures are followed, you will bear the risk of
                      any losses resulting from unauthorized or fraudulent
                      telephone transactions on your account. 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
REGISTRATION          You may transfer the registration of any of your Fund
                      shares to another person by completing a transfer form and
                      sending it to: VANGUARD FINANCIAL CENTER, P.O. BOX 1110,
                      VALLEY FORGE, PA 19482. The request must be in Good Order.
                      BEFORE MAILING YOUR REQUEST, PLEASE CALL OUR CLIENT
                      SERVICES DEPARTMENT (1-800-662-2739) FOR FULL
                      INSTRUCTIONS.
- --------------------------------------------------------------------------------
 
                                       22
<PAGE>   25
 
STATEMENTS AND
REPORTS               Vanguard will send you a confirmation statement each time
                      you initiate a transaction in your account (except for
                      checkwriting redemptions from Vanguard money market
                      accounts). You will also receive a comprehensive account
                      statement at the end of each calendar quarter. The
                      fourth-quarter statement will be a year-end statement,
                      listing all transaction activity for the entire calendar
                      year.
 
                      Vanguard's Average Cost Statement provides you with the
                      average cost of shares redeemed from your account, using
                      the average cost single category method. This service is
                      available for most taxable accounts opened since January
                      1, 1986. In general, investors who redeemed shares from a
                      qualifying Vanguard account may expect to receive an
                      Average Cost Statement along with their Portfolio Summary
                      Statements. 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.
- --------------------------------------------------------------------------------
 
OTHER VANGUARD
SERVICES              For more information about any of these services, please
                      call our Investor Information Department at
                      1-800-662-7447.
 
VANGUARD DIRECT
DEPOSIT SERVICE       With Vanguard's Direct Deposit Service, most U.S.
                      Government checks (including Social Security and military
                      pension checks) and private payroll checks may be
                      automatically deposited into your Vanguard Fund account.
                      Separate brochures and forms are available for direct
                      deposit of U.S. Government and private payroll checks.
 
VANGUARD AUTOMATIC
EXCHANGE SERVICE      Vanguard's Automatic Exchange Service allows you to move
                      money automatically among your Vanguard Fund accounts. For
                      instance, the service can be used to "dollar cost average"
                      from a money market portfolio into a stock or bond fund or
                      to contribute to an IRA or other retirement plan. Please
                      contact our Client Services Department at 1-800-662-2739
                      for additional information.
 
VANGUARD FUND
EXPRESS               Vanguard's Fund Express allows you to transfer money
                      between your Fund account and your account at a bank,
                      savings and loan association, or a credit union that is a
                      member of the Automated Clearing House (ACH) system. You
                      may elect this service on the Account Registration Form or
                      call our Investor Information Department (1-800-662-7447)
                      for a Fund Express application.
 
                      Special rules govern how your Fund Express purchases or
                      redemptions are credited to your account. In addition,
                      some services of Fund Express cannot be used with specific
                      Vanguard Funds. For more information, please refer to the
                      Vanguard Fund Express brochure.
 
VANGUARD DIVIDEND
EXPRESS               Vanguard's Dividend Express allows you to transfer your
                      dividends and/or capital gains distributions
                      automatically from your Fund account, one business day
                      after the Fund's payable date, to your account at a bank,
                      savings and loan association, or 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 Vanguard Dividend Express
                      application.
 
                                       23
<PAGE>   26
 
VANGUARD
TELE-ACCOUNT          Vanguard's Tele-Account is a convenient, automated service
                      that provides share price, price change and yield
                      quotations on Vanguard Funds through any TouchToneTM
                      telephone. This service also lets you obtain information
                      about your account balance, your last transaction, and
                      your most recent dividend or capital gains payment. To
                      contact Vanguard's Tele-Account service, dial
                      1-800-ON-BOARD (1-800-662-6273). A brochure offering
                      detailed operating instructions is available from the
                      Investor Information Department (1-800-662-7447).
- --------------------------------------------------------------------------------
 
                                       24
<PAGE>   27
 
                     (THIS PAGE INTENTIONALLY LEFT BLANK.)
<PAGE>   28
 
                     (THIS PAGE INTENTIONALLY LEFT BLANK.)
<PAGE>   29
 
                     (THIS PAGE INTENTIONALLY LEFT BLANK.)
<PAGE>   30
 
   
<TABLE>
<S>                              <C>                                    <C>
      P024                                                                                         [LOGO]
                                 [VANGUARD EXPLORER FUND LOGO]                       [VANGUARD EXPLORER FUND LOGO] 
                                 --------------------------                       P   R   O   S   P   E   C   T   U   S
                                 THE VANGUARD GROUP
                                 OF INVESTMENT                                  FEBRUARY 23, 1996; REVISED AUGUST 1, 1996
                                 COMPANIES                                              [VANGUARD GROUP LOGO]          
                                 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
</TABLE>
    
 
- --------------------------------------------------------------------------------
<PAGE>   31
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
[VANGUARD EXPLORER FUND LOGO]                     A Member of The Vanguard Group
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
   
PROSPECTUS -- FEBRUARY 23, 1996; REVISED AUGUST 1, 1996
    
- --------------------------------------------------------------------------------
 
FUND INFORMATION: INSTITUTIONAL PARTICIPANT SERVICES -- 1-800-523-1188
- --------------------------------------------------------------------------------
 
INVESTMENT
OBJECTIVE AND
POLICIES              Vanguard Explorer Fund, Inc. (the "Fund") is an open-end
                      diversified investment company that seeks to provide
                      long-term growth in capital. The Fund invests primarily in
                      equity securities of small companies deemed to have
                      favorable prospects for growth in market value. Dividend
                      income is expected to be incidental to this objective.
                      There is no assurance that the Fund will achieve its
                      stated objective. Shares of the Fund are neither insured
                      nor guaranteed by any agency of the U.S. Government,
                      including the FDIC.
- --------------------------------------------------------------------------------
 
IMPORTANT NOTE        This Prospectus is intended exclusively for participants
                      in employer-sponsored retirement or savings plans, such as
                      tax-qualified pension and profit-sharing plans and 401(k)
                      thrift plans, as well as 403(b) custodial accounts for
                      non-profit educational and charitable organizations.
                      Another version of this Prospectus, containing information
                      on how to open a personal investment account with the
                      Fund, is available for individual investors. To obtain a
                      copy of that version of the Prospectus, please call
                      1-800-662-7447.
- --------------------------------------------------------------------------------
 
OPENING AN
ACCOUNT               The Fund is an investment option under a retirement or
                      savings program sponsored by your employer. The
                      administrator of your retirement plan or your employee
                      benefits office can provide you with detailed information
                      on how to participate in your plan and how to elect the
                      Fund as an investment option. If you have any questions
                      about the Fund please contact Participant Services at
                      1-800-523-1188. If you have any questions about your plan
                      account, contact your plan administrator or the
                      organization that provides recordkeeping services for your
                      plan.
- --------------------------------------------------------------------------------
 
   
ABOUT THIS
PROSPECTUS            This Prospectus is designed to set forth concisely the
                      information you should know about the Fund before you
                      invest. It should be retained for future reference. A
                      "Statement of Additional Information" containing
                      additional information about the Fund has been filed with
                      the Securities and Exchange Commission. This Statement is
                      dated February 23, 1996; revised August 1, 1996 and has
                      been incorporated by reference into this Prospectus. A
                      copy may be obtained without charge by writing to the Fund
                      or by calling Participant Services.
    
- --------------------------------------------------------------------------------
 
TABLE OF CONTENTS
 
   
<TABLE>
<S>                                        <C>                                        <C>
                                 Page                                       Page                                       Page
Fund Expenses ..................... 2      Investment Risks .................. 5      Dividends, Capital Gains
Financial Highlights .............. 2      Who Should Invest ................. 6      and Taxes ........................ 12
Yield and Total Return ............ 3      Implementation of Policies ........ 6      The Funds Share Price ............ 12
        FUND INFORMATION                   Investment Limitations ............ 8      General Information .............. 13
Investment Objective .............. 4      Management of the Fund ............ 8              SERVICE GUIDE
Investment Policies ............... 4      Investment Advisers ............... 9      Participating in Your
                                           Performance Record ............... 11      Plan ............................. 14
</TABLE>
    
 
- --------------------------------------------------------------------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE COMMISSION PASSED UPON THE ACCURACY OR
ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
OFFENSE.
- --------------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
 
<PAGE>   32
 
FUND EXPENSES         The following table illustrates ALL expenses and fees that
                      a shareholder of the Fund would incur. The expenses and
                      fees set forth in the table are for the 1995 fiscal year.
 
<TABLE>
                           <S>                                                               <C>        <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 Expenses...................................      0.36%
                           Investment Advisory Fees...............................................       0.28
                           12b-1 Fees.............................................................       None
                           Other Expenses
                             Distribution Costs...........................................   0.02%
                             Miscellaneous Expenses.......................................    0.02
                                                                                             -----
                           Total Other Expenses...................................................      0.04%
                                                                                                        -----
                                    TOTAL OPERATING EXPENSES......................................      0.68%
                                                                                                        =====
</TABLE>
 
                      The purpose of this table is to assist you in
                      understanding the various costs and expenses that an
                      investor would bear directly or indirectly as a
                      shareholder in the Fund.
 
                      The following example illustrates the expenses that you
                      would incur on a $1,000 investment over various periods,
                      assuming (1) a 5% annual rate of return and (2) redemption
                      at the end of each period. As noted in the table above,
                      the Fund charges no redemption fees of any kind.
 
<TABLE>
<CAPTION>
                        1 YEAR       3 YEARS       5 YEARS       10 YEARS
                        ------       -------       -------       --------
                                     
                        <S>          <C>           <C>           <C>
                          $7           $22           $38           $ 85
</TABLE>
 
                      This example should not be considered a representation of
                      past or future expenses or performance. Actual expenses
                      may be higher or lower than those shown.
- --------------------------------------------------------------------------------
 
FINANCIAL
HIGHLIGHTS            The following financial highlights for a share outstanding
                      throughout each year, insofar as they relate to each of
                      the five years in the period ended October 31, 1995, have
                      been audited by Price Waterhouse LLP, independent
                      accountants, whose report thereon was unqualified. This
                      information should be read in conjunction with the Fund's
                      financial statements and notes thereto which, together
                      with the remaining portions of the Fund's 1995 Annual
                      Report to Shareholders, are incorporated by reference in
                      the Statement of Additional Information and this
                      Prospectus, and which appear, along with the report of
                      Price Waterhouse LLP, in the Fund's 1995 Annual Report to
                      Shareholders. For a more complete discussion of the Fund's
                      performance, please see the Fund's 1995 Annual Report to
                      Shareholders, which may be obtained without charge by
                      writing to the Fund or by calling Participant Services at
                      1-800-523-1188.
 
                                        2
<PAGE>   33
 
<TABLE>
<CAPTION>
                                                                    YEAR ENDED OCTOBER 31,
                                    -----------------------------------------------------------------------------------------
                              1995      1994      1993      1992      1991      1990      1989      1988      1987      1986
<S>                          <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>    
- -----------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE,
  BEGINNING OF YEAR........  $45.99    $49.37    $41.23    $36.75    $22.62    $30.76    $29.64    $25.06    $31.59    $32.56
                             ------    ------    ------    ------    ------    ------    ------    ------    ------    ------
INVESTMENT OPERATIONS
  Net Investment Income....     .24       .16       .14       .15       .26       .31       .39       .27       .09       .02
  Net Realized and
    Unrealized Gain (Loss)
    on Investments.........    7.25      1.77      8.91      4.59     14.21     (7.07)     2.64      6.38     (3.33)      .63
                             ------    ------    ------    ------    ------    ------    ------    ------    ------    ------
    TOTAL FROM INVESTMENT
      OPERATIONS...........    7.49      1.93      9.05      4.74     14.47     (6.76)     3.03      6.65     (3.24)      .65
- -----------------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net
    Investment Income......    (.17)     (.14)     (.13)     (.26)     (.34)     (.37)     (.32)     (.11)     (.02)     (.33)
  Distributions from
    Realized
    Capital Gains..........   (2.26)    (5.17)     (.78)       --        --     (1.01)    (1.59)    (1.96)    (3.27)    (1.29)
                             ------    ------    ------    ------    ------    ------    ------    ------    ------    ------
    TOTAL DISTRIBUTIONS....   (2.43)    (5.31)     (.91)     (.26)     (.34)    (1.38)    (1.91)    (2.07)    (3.29)    (1.62)
- -----------------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF
  YEAR.....................  $51.05    $45.99    $49.37    $41.23    $36.75    $22.62    $30.76    $29.64    $25.06    $31.59
=============================================================================================================================
TOTAL RETURN...............   17.46%     4.49%    22.28%    12.95%    64.64%   (22.92)%   10.95%    28.73%   (11.42)%    1.98%
=============================================================================================================================
RATIOS/SUPPLEMENTAL DATA
Net Assets, End of Year
  (Millions)...............  $1,476    $1,112      $802      $519      $381      $207      $270      $266      $210      $272
Ratio of Expenses to
  Average Net Assets.......     .68%      .70%      .73%      .69%      .56%      .67%      .58%      .65%      .62%      .76%
Ratio of Net Investment
  Income to Average Net
  Assets...................     .52%      .39%      .32%      .38%      .85%     1.11%     1.24%      .99%      .28%      .05%
Portfolio Turnover Rate....      66%       82%       51%       43%       49%       46%       16%       28%        9%       15%
</TABLE>
 
- --------------------------------------------------------------------------------
 
YIELD AND TOTAL
RETURN                From time to time the Fund may advertise its yield and
                      total return. Both yield and total return figures are
                      based on historical earnings and are not intended to
                      indicate future performance. The "total return" of the
                      Fund refers to the average annual compounded rates of
                      return over one-, five- and ten-year periods or over the
                      life of the Fund (as stated in the advertisement) that
                      would equate an initial amount invested at the beginning
                      of a stated period to the ending redeemable value of the
                      investment, assuming the reinvestment of all dividend and
                      capital gains distributions.
 
                      In accordance with industry guidelines set forth by the
                      U.S. Securities and Exchange Commission, 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 30 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 30-day yield may not fully
                      reflect the income paid to an investor's account or the
                      yield reported in the Fund's reports to shareholders.
                      Additionally, the Fund may compare its performance to that
                      of the unmanaged Russell 2000 Stock Index.
- --------------------------------------------------------------------------------
 
                                        3
<PAGE>   34
 
INVESTMENT
OBJECTIVE

THE FUND SEEKS TO
PROVIDE LONG-TERM
CAPITAL GROWTH        The objective of the Fund is to provide long-term capital
                      growth by investing primarily in the equity securities of
                      small companies. Dividend income is expected to be
                      incidental to this objective. There is no assurance that
                      the Fund will achieve its stated objective.
 
                      The investment objective of the Fund is fundamental and so
                      cannot be changed without the approval of a majority of
                      the Fund's shareholders.
- --------------------------------------------------------------------------------
 
INVESTMENT
POLICIES

THE FUND INVESTS IN
SMALL COMPANY STOCKS  The Fund invests primarily in the equity securities of
                      small companies which are deemed to offer favorable
                      prospects for growth in market value. These securities are
                      primarily common stocks but may also include securities
                      convertible into common stocks. The Fund is managed
                      without regard to tax ramifications.
 
                      Securities purchased by the Fund may be issued by small or
                      unseasoned companies with speculative risk
                      characteristics. Dividend income paid by such securities,
                      if any, will ordinarily be negligible. These securities
                      will generally be traded in established over-the-counter
                      markets, rather than on a national securities exchange.
 
                      The median market capitalization of the companies included
                      in the Fund -- that is, the median market value of the
                      companies' outstanding shares -- is expected to range from
                      $100 million to $500 million. By comparison, for companies
                      included in the Russell 2000 Stock Index, a benchmark of
                      the market for small company stocks, the median market
                      capitalization is approximately $430 million. The median
                      capitalization of companies in the Standard & Poor's 500
                      Composite Stock Price Index, a widely used measure of the
                      broad stock market, is approximately $17.2 billion.
 
   
                      In addition to investing in the equity securities of small
                      companies, the Fund may purchase stock futures contracts
                      and options to a limited extent, and may invest in certain
                      short-term fixed income securities. The Fund is also
                      authorized to invest, to a limited extent, in foreign and
                      restricted or illiquid securities. See "Implementation of
                      Policies" for a description of these and other investment
                      practices of the Fund.
    
 
                      The Fund is responsible for voting the shares of all
                      securities it holds.
 
                      These policies are not fundamental and therefore may be
                      changed by the Fund's Board of Directors without
                      shareholder approval. However, shareholders will be
                      notified prior to any material change in the Fund's
                      policies.
- --------------------------------------------------------------------------------
 
                                        4
<PAGE>   35
 
INVESTMENT RISKS

INVESTORS ARE EXPOSED
TO THE MARKET RISK
OF STOCKS             As a mutual fund investing primarily in common stocks, the
                      Fund is subject to MARKET RISK -- i.e., the possibility
                      that stock prices in general will 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 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 1995, as measured by the Standard &
                      Poor's 500 Composite Stock Price Index:
 
<TABLE>
<CAPTION>
                          AVERAGE ANNUAL U.S. STOCK MARKET RETURNS (1926-1995)
                                       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      +12.5      +10.3        +10.7        +10.7
</TABLE>
 
                      As shown, common stocks have provided annual total returns
                      (capital appreciation plus dividend income) averaging
                      +10.7% for all 10-year periods from 1926 to 1995. The
                      return in individual years has varied from a low of -43.3%
                      to a high of +53.9%, reflecting the short-term volatility
                      of stock prices. Average return may not be useful for
                      forecasting future returns in any particular period, as
                      stock returns are quite volatile from year to year.
 
SMALL COMPANY STOCKS
MAY EXHIBIT GREATER
VOLATILITY            Small company stocks, which are the Fund's primary
                      investments, have historically been more volatile in price
                      than the stock market as a whole. Among the likely reasons
                      for the greater price volatility of small company stocks
                      are the less certain growth prospects of smaller firms, a
                      low degree of liquidity in the markets for small company
                      stocks, and the small to negligible dividends generally
                      paid by small companies. Besides exhibiting greater
                      volatility, small company stocks have at times fluctuated
                      in value independently of the broad stock market.
 
                      Investors should therefore expect that small company
                      stocks (and hence the Fund's investments) may be more
                      volatile than the stocks of more established companies. In
                      addition, investors should recognize that small company
                      stocks may rise or fall in value independently of the
                      broad stock market.
 
THE FUND IS SUBJECT
TO MANAGER RISK       The investment adviser manages the Fund according to the
                      traditional methods of "active" investment management,
                      which involve the buying and selling of securities based
                      upon economic, financial and market analysis and
                      investment judgement. MANAGER RISK refers to the
                      possibility that the Fund's investment advisers
                      may fail to execute the Fund's investment strategy
                      effectively. As a result, the Fund may fail to achieve its
                      stated objective.
- --------------------------------------------------------------------------------
 
                                        5
<PAGE>   36
 
WHO SHOULD
INVEST

INVESTORS SEEKING
LONG-TERM GROWTH      The Fund is intended for investors who have the
                      perspective, patience and financial ability to assume
                      above-average interim investment risks in pursuit of
                      long-term capital growth. Since a portion of the
                      securities the Fund owns may be considered speculative in
                      nature or unseasoned by traditional investment standards,
                      substantially greater-than-average investment risk is
                      involved. The Fund's share price is expected to be
                      volatile. Because of the risks associated with common
                      stock 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 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 certain 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, either because of the
                      timing of the investment or previous excessive trading by
                      the investor. Additionally, the Fund reserves the right to
                      suspend the offering of its shares.
 
                      No assurance can be given that the Fund will attain its
                      objective or that shareholders will be protected from the
                      risk of loss that is inherent in equity investing.
                      Investors may wish to reduce the potential risk of
                      investing in the Fund by purchasing shares on a periodic
                      basis (dollar-cost averaging) rather than making an
                      investment in one lump sum.
 
                      The Fund is not intended as a complete investment program.
                      Most investors should maintain diversified holdings of
                      securities with different risk characteristics --
                      including common stocks, bonds and money market
                      instruments. Investors may also wish to complement an
                      investment in the Fund with other types of common stock
                      investments.
- --------------------------------------------------------------------------------
 
IMPLEMENTATION
OF POLICIES           In addition to investing in the equity securities of small
                      companies, the Fund may use a number of other investment
                      vehicles to achieve its objective.
 
THE FUND MAY INVEST IN
FOREIGN AND RESTRICTED
OR ILLIQUID STOCKS    The Fund is authorized to invest up to 20% of its assets
                      in foreign securities and may engage in currency
                      transactions with respect to such investments. The Fund is
                      also authorized to invest up to 15% of its assets in
                      restricted or illiquid securities.
 
THE FUND MAY INVEST
IN SHORT-TERM FIXED
INCOME SECURITIES     Although it normally seeks to remain substantially
                      invested in equity securities, the Fund may invest for
                      temporary purposes in certain short-term fixed income
                      securities. Such securities may be used to invest
                      uncommitted cash balances, to maintain liquidity to meet
                      shareholder redemptions, or to take a temporarily
                      defensive position against potential stock market
                      declines. These securities include: obligations of the
                      United States Government and its agencies or
                      instrumentalities; commercial paper, bank certificates of
                      deposit, and bankers' acceptances; and repurchase
                      agreements collateralized by these securities.
 
THE FUND MAY LEND
ITS SECURITIES        The Fund may lend its investment securities to qualified
                      institutional 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
 
                                        6
<PAGE>   37
 
                      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
MONEY UNDER UNUSUAL
CIRCUMSTANCES         The Fund may borrow money, subject to the limits set forth
                      on page 8, for temporary or emergency purposes, including
                      the meeting of redemption requests which might otherwise
                      require the untimely disposition of securities.
 
PORTFOLIO TURNOVER WILL
NOT EXCEED 100%       Although it generally seeks to invest for the long term,
                      the Fund retains the right to sell securities irrespective
                      of how long they have been held. It is anticipated that
                      the annual portfolio turnover rate of the Fund will not
                      exceed 100%. A turnover rate of 100% would occur, for
                      example, if all of the securities of the Fund were
                      replaced within one year.
 
DERIVATIVE
INVESTING             Derivatives are instruments whose values are linked to or
                      derived from an underlying security or index. The most
                      common and conventional types of derivative securities are
                      futures and options.
 
THE FUND MAY INVEST
IN DERIVATIVE SECURITIES
                      The Fund may invest in futures contracts and options, but
                      only to a limited extent. Specifically, the Fund may enter
                      into futures contracts 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 transactions only to the extent that obligations
                      under such contracts or transactions represent not more
                      than 20% of the Fund's assets.
 
                      Futures contracts and options may be used for several
                      common fund management strategies: to maintain cash
                      reserves while simulating full investment, to facilitate
                      trading, to reduce transaction costs, or to seek higher
                      investment returns when a specific futures contract is
                      priced more attractively than other futures contracts or
                      the underlying security or index.
 
                      The Fund may use futures contracts for bona fide "hedging"
                      purposes. In executing a hedge, a manager sells, for
                      example, stock index futures to protect against a decline
                      in the stock market. As such, if the market drops, the
                      value of the futures position will rise, thereby
                      offsetting the decline in value of the Fund's stock
                      holdings.
 
FUTURES CONTRACTS AND
OPTIONS POSE CERTAIN
RISKS                 The primary risks associated with the use of futures
                      contracts and options are: (i) imperfect correlation
                      between the change in market value of the stocks 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 in
                      those contracts whose price fluctuations are expected to
                      resemble those of the Portfolio'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.
- --------------------------------------------------------------------------------
 
                                        7
<PAGE>   38
 
INVESTMENT
LIMITATIONS           The Fund has adopted certain limitations on its investment
                      practices. Specifically, the Fund will not:
 
THE FUND HAS ADOPTED
CERTAIN FUNDAMENTAL
LIMITATIONS           (a) 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;
 
                      (b) invest more than 25% of its assets in any one
                          industry; and
 
                      (c) borrow money except from a bank (or through reverse
                          repurchase agreements) for temporary or emergency (not
                          leveraging) purposes, and then in an amount not
                          exceeding 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 net assets, the
                          Fund will not make any additional investments.
 
                      These investment limitations are considered at the time
                      investment securities are purchased. The limitations
                      described here and in the Statement of Additional
                      Information may be changed only with the approval of a
                      majority of the Fund's shareholders.
- --------------------------------------------------------------------------------
 
MANAGEMENT OF
THE FUND

VANGUARD ADMINISTERS
AND DISTRIBUTES THE
FUND                  The Fund is a member of The Vanguard Group of Investment
                      Companies, a family of more than 30 investment companies
                      with more than 90 distinct investment portfolios and total
                      assets in excess of $180 billion. Through their
                      jointly-owned subsidiary, The Vanguard Group, Inc.
                      ("Vanguard"), the Fund and the other funds in the Group
                      obtain at cost virtually all of their corporate
                      management, administrative, shareholder accounting and
                      distribution services. Vanguard also provides investment
                      advisory services on an at-cost basis to certain Vanguard
                      funds. As a result of Vanguard's unique corporate
                      structure, the Vanguard funds have costs substantially
                      lower than those of most competing mutual funds. In 1995,
                      the average expense ratio (annual costs including advisory
                      fees divided by total net assets) for the Vanguard funds
                      amounted to approximately .31% compared to an average of
                      1.11% for the mutual fund industry (data provided by
                      Lipper Analytical Services).
 
                      The Officers of the Fund manage its day-to-day operations
                      and are responsible to the Fund's Directors. The Directors
                      set broad policies for the Fund and 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 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.
 
                                        8
<PAGE>   39
 
                      Vanguard also provides distribution and marketing services
                      to the Vanguard funds. The funds are available on a
                      no-load basis (i.e., there are no sales commissions or
                      12b-1 fees). However, each fund bears its share of the
                      Group's distribution costs.
- --------------------------------------------------------------------------------
 
INVESTMENT
ADVISERS
THE FUND EMPLOYS TWO
INVESTMENT MANAGERS   The Fund currently employs two investment advisers:
                      Wellington Management Company ("WMC"), 75 State Street,
                      Boston, MA 02109; and Granahan Investment Management, Inc.
                      ("Granahan"), 275 Wyman Street, Waltham, MA 02154.
 
                      The proportion of the net assets of the Fund managed by
                      each adviser is established by the Board of Directors and
                      may be changed in the future as circumstances warrant.
                      Presently, WMC is responsible for approximately 44% of the
                      assets of the Fund, and Granahan for approximately 43% of
                      the assets, and approximately 13%, the Fund's remaining
                      net assets, is held in cash. Because the Fund employs two
                      advisers it is possible that the advisers would purchase
                      or sell the same security at the same time. Such a
                      situation might result in increased brokerage costs or
                      adverse tax consequences to the Fund. The Board of
                      Directors monitors portfolio activity in order to minimize
                      any possible adverse consequences.
 
                      The Fund has entered into investment advisory agreements
                      with both WMC and Granahan which provide that both
                      advisers manage the investment and reinvestment of the
                      Fund's assets and continuously review, supervise and
                      administer the Fund's investment program. The advisers
                      discharge their responsibilities subject to the control of
                      the Officers and Directors of the Fund.
 
                      WMC is a professional investment advisory firm which
                      globally provides services to investment companies, other
                      institutions and individuals. Among the clients of WMC are
                      more than 10 investment companies of The Vanguard Group.
                      As of December 31, 1995, WMC held investment management
                      authority with respect to more than $108 billion of
                      assets. WMC and its predecessor organizations have
                      provided investment advisory services to investment
                      companies since 1933 and to investment counseling clients
                      since 1960.
 
                      Kenneth L. Abrams, Vice President of WMC, serves as
                      portfolio manager of the assets of the Fund assigned to
                      WMC. Mr. Abrams has been employed by WMC for 9 years and
                      has served as portfolio manager for the Fund since
                      February of 1994. In managing the assets of the Fund
                      assigned to WMC, Mr. Abrams is supported by research and
                      other investment services provided by the professional
                      staff of WMC.
 
   
                      The Fund pays WMC an advisory fee at the end of each
                      fiscal quarter, calculated by applying a quarterly rate,
                      based on the following annual percentage rates, to the
                      average month-end net assets of the Fund managed by WMC
                      for the quarter:
    
 
   
<TABLE>
<CAPTION>
                                  NET ASSETS
                             --------------------           RATE
                                                           ------
                        <S>                                <C>
                        First $500 million                  .250%
                        Next $250 million                   .200%
                        Next $250 million                   .150%
                        Assets in excess of $1 billion      .100%
</TABLE>
    
 
                                        9
<PAGE>   40
 
   
                      This basic advisory fee may be increased or decreased by
                      up to 50% by applying an adjustment formula
                      ("incentive/penalty fee") based on the investment
                      performance of the portion of the Fund managed by WMC
                      relative to the investment record of the Russell 2000
                      Small Stock Index (the "Russell 2000"), an index of small
                      capitalization common stocks.
    
 
   
                      Under the rules of the Securities and Exchange Commission,
                      the new incentive/ penalty fee will not be fully operable
                      until the quarter ending July 31, 1999. Until that date, a
                      "blended" fee rate consisting of varying percentages of
                      (i) the performance adjustment based on the schedule set
                      forth in the Statement of Additional Information, and (ii)
                      the performance adjustment based on the schedule set forth
                      in Explorer Fund's previous investment advisory agreement
                      with the WMC shall be used. Please see Statement of
                      Additional Information for more information on this
                      transition period.
    
 
                      Granahan is a professional investment advisory firm
                      founded in 1985. As of December 31, 1995, Granahan held
                      discretionary management authority with respect to
                      approximately $813 million in assets. John J. Granahan is
                      portfolio manager of the assets of the Fund assigned to
                      Granahan. Mr. Granahan served as portfolio manager of
                      Explorer II from its inception in June 1985 through its
                      merger with the Fund in February 1990. He also served as
                      portfolio manager of Explorer Fund from January 1972 to
                      September 1979 while employed at WMC.
 
   
                      The Fund pays Granahan an advisory 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 $500 million                  .300%
                        Next $250 million                   .200%
                        Next $250 million                   .150%
                        Assets in excess of $1 billion      .100%
</TABLE>
    
 
   
                      This basic advisory fee may be increased or decreased by
                      applying an adjustment formula ("incentive/penalty fee")
                      based on the investment performance of the portion of the
                      Fund managed by Granahan relative to the Russell 2000, an
                      index of small capitalization common stocks.
    
 
   
                      For the fiscal year ended October 31, 1995, the aggregate
                      investment advisory fees paid by the Fund to WMC and
                      Granahan represented an effective annual base rate of .27
                      of 1% of average net assets before an increase of $25,000
                      based on performance. The investment advisory fees paid by
                      the Fund for this period to WMC represented an effective
                      annual rate of .28 of 1% of the average net assets managed
                      by WMC and the investment advisory fees paid to Granahan
                      represented an effective annual rate of .30 of 1% of the
                      average net assets managed by Granahan. These fees were
                      paid under a previous fee schedule that provided for a
                      higher rate of fees.
    
 
                      The investment advisory agreements with WMC and Granahan
                      authorize the advisers to select brokers or dealers to
                      execute purchases and sales of the Fund's
 
                                       10
<PAGE>   41
 
                      portfolio securities, and direct the advisers to use their
                      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 WMC and Granahan to pay higher
                      commissions in recognition of brokerage services felt
                      necessary for the achievement of better execution,
                      provided the advisers believe 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
RECORD                The table in this section provides investment results for
                      the Fund over several periods. The results represent the
                      Fund's "total return" investment performance, which
                      assumes the reinvestment of all capital gains and income
                      dividends for the indicated periods. Also included is
                      comparative information on the unmanaged Standard & Poor's
                      500 Composite Stock Price Index, a widely used barometer
                      of stock market activity; the Russell 2000 Stock Index, an
                      index of small company stocks; and the Consumer Price
                      Index, a statistical measure of changes in the prices of
                      goods and services. The table does not make any allowance
                      for federal, state or local income taxes, which
                      shareholders must pay on a current basis.
 
                      The results shown 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.
 
<TABLE>
<CAPTION>
                                                        ANNUAL AVERAGE PERCENTAGE CHANGE
                                                ------------------------------------------------
                                 FISCAL         EXPLORER     S&P 500     RUSSELL      CONSUMER
                             ENDED 10/31/95       FUND        INDEX       INDEX      PRICE INDEX
                             --------------     --------     -------     -------     -----------
                             <S>                <C>          <C>         <C>         <C>
                             3 Years              +14.5%      +14.7%      +16.0 %        +2.7%
                             5 Years              +22.8       +17.2       +22.1          +2.8
                             10 Years             +10.7       +15.4       +11.8          +3.5
                             Lifetime*            + 9.0       +10.9         N/A          +5.6
                             *December 11, 1967, to October 31, 1995. Data for the Consumer
                               Price Index
                              begins December 31, 1967.
</TABLE>
 
- --------------------------------------------------------------------------------
 
                                       11
<PAGE>   42
 
DIVIDENDS,
CAPITAL GAINS
AND TAXES
THE FUND DISTRIBUTES
DIVIDENDS AND CAPITAL
GAINS ANNUALLY        The Fund expects to pay dividends annually from ordinary
                      income. Capital gains distributions, if any, will be made
                      annually. All dividend and capital gains distributions are
                      automatically reinvested in additional shares of the Fund.
                      In order to satisfy certain distribution requirements of
                      the IRS, the Fund may also declare special year-end
                      distributions during December. 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 that its income is distributed to its shareholders.
 
                      If you utilize the Fund as an investment option in an
                      employer-sponsored retirement or savings plan, dividend
                      and capital gains distributions from the Fund will
                      generally not be subject to current taxation, but will
                      accumulate on a tax-deferred basis. In general,
                      employer-sponsored retirement and savings plans are
                      governed by a complex set of tax rules. If you participate
                      in such a plan, consult your plan administrator, your
                      plan's Summary Plan Description, or a professional tax
                      adviser regarding the tax consequences of your
                      participation in the plan and of any plan contributions or
                      withdrawals.
- --------------------------------------------------------------------------------
 
THE SHARE PRICE
OF THE FUND           The Fund's share price or "net asset value" per share is
                      determined by dividing the total assets of the Fund, less
                      all liabilities, by the total number of shares
                      outstanding. The net asset value is calculated at the
                      close of regular trading (generally 4:00 p.m. Eastern
                      time) each day the New York Stock Exchange is open for
                      trading.
 
                      Portfolio securities that are listed on an exchange are
                      valued at the latest quoted sales prices. Securities not
                      traded on the valuation date are valued at the mean of the
                      latest quoted bid and asked prices. Securities not listed
                      on an exchange are valued at the latest quoted bid price.
                      Short-term instruments (those with remaining maturities of
                      60 days or less) are valued at cost, plus or minus any
                      amortized discount or premium, which approximates market
                      values. The Fund values foreign securities using the
                      latest quoted share price or, if necessary, the security's
                      broadest and most representative market value. All prices
                      of listed securities are taken from the exchange where the
                      security is primarily traded. 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 securities. The prices provided by a pricing
                      service may be determined without regard to bid or last
                      sale prices of each security but take into account
                      institutional-size transactions in similar groups of
                      securities as well as any developments related to specific
                      securities. Other assets and securities for which market
                      quotations are not readily available or which are
                      restricted as to sale are valued by such methods as the
                      Board of Directors deems in good faith to reflect fair
                      value.
 
                      The Fund's price per share can be found daily in the
                      mutual fund section of most major newspapers under the
                      heading of Vanguard.
- --------------------------------------------------------------------------------
 
                                       12
<PAGE>   43
 
GENERAL
INFORMATION           Vanguard Explorer Fund, Inc. is a Maryland corporation. On
                      February 28, 1990, the Fund acquired the assets of
                      Explorer II, Inc., an investment company that was a member
                      of The Vanguard Group and that had investment objectives
                      and policies similar to those of the Fund. Also, on that
                      date the Fund retained Granahan Investment Management
                      Inc., the original investment adviser to Explorer II,
                      Inc., as an additional investment adviser.
 
                      The authorized capital stock of the Fund consists of
                      100,000,000 shares at the par value of $.001 each. The
                      Board of Directors has the power to designate one or more
                      classes ("Portfolios") of shares of common stock and to
                      classify or reclassify any unissued shares with respect to
                      such Portfolios. Currently the Fund is offering one class
                      of shares.
 
                      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 Fund.
 
                      The shares of the Fund are fully paid and nonassessable;
                      have no preferences as to conversion, exchange, dividends,
                      retirement or other features; and have no pre-emptive
                      rights. Such shares have noncumulative 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.
 
                      All securities and cash are held by State Street Bank and
                      Trust Company, Boston, MA. CoreStates Bank, N.A., holds
                      daily cash balances of the Fund which are used to invest
                      in repurchase agreements or securities acquired in these
                      transactions. The Vanguard Group, Inc., Valley Forge, PA,
                      serves as the Fund's Transfer and Dividend Disbursing
                      Agent. Price Waterhouse LLP, serves as independent
                      accountants for the Fund and audits its financial
                      statements annually. The Fund is not involved in any
                      litigation.
- --------------------------------------------------------------------------------
 
                                       13
<PAGE>   44
 
                                 SERVICE GUIDE
 
PARTICIPATING IN
YOUR PLAN             The Fund is available as an investment option in your
                      retirement or savings plan. The administrator of your plan
                      or your employee benefits office can provide you with
                      detailed information on how to participate in your plan
                      and how to elect the Fund as an investment option.
 
                      If you have any questions about the Fund, including the
                      Fund's investment objective, policies, risk
                      characteristics or historical performance, please contact
                      Participant Services at 1-800-523-1188.
 
                      If you have questions about your account, contact your
                      plan administrator or the organization which provides
                      recordkeeping services for your plan.
- --------------------------------------------------------------------------------
 
INVESTMENT OPTIONS
AND ALLOCATIONS       You may be permitted to elect different investment
                      options, alter the amounts contributed to your plan, or
                      change how contributions are allocated among your
                      investment options in accordance with your plan's specific
                      provision. See your plan administrator or employee
                      benefits office for more details.
- --------------------------------------------------------------------------------
 
TRANSACTIONS IN
FUND SHARES           Contributions, exchanges or distributions of a Fund's
                      shares are effective when received in "good order" by
                      Vanguard. "Good order" means that complete information on
                      the purchase, exchange or redemption and the appropriate
                      monies have been received by Vanguard.
 
   
                      Vanguard must consider the interests of all Portfolio
                      shareholders. Therefore, for institutional investors who
                      are not participants in a retirement or savings plan, we
                      reserve the right to:
    
 
   
                      - Delay or reject any purchase or exchange request that
                        may disrupt the Portfolio's operation or performance.
    
 
   
                      - Revise or terminate the exchange privilege or limit the
                        amount of an exchange, at any time, without notice.
    
 
   
                      - Take up to seven days to deliver your redemption
                        proceeds.
    
 
   
                      - Pay redemption proceeds--in whole or in part--through a
                        distribution in kind of readily marketable securities.
    
- --------------------------------------------------------------------------------
 
MAKING EXCHANGES      Your plan may allow you to exchange monies from one
                      investment option to another. However, the Fund reserves
                      the right to refuse any exchange purchase request. Check
                      with your plan administrator for details on the rules
                      governing exchanges in your plan. Certain investment
                      options, particularly company stock or guaranteed
                      investment contracts (GICs), may be subject to unique
                      restrictions.
 
                                       14
<PAGE>   45
 
                      Before making an exchange, you should consider the
                      following:
 
                      - If you are making an exchange to another Vanguard Fund
                        option, please read the Fund's prospectus. Contact
                        Participant Services at 1-800-523-1188 for a copy. For
                        the hearing impaired, please call 1-800-523-8004 between
                        the hours of 8:30 a.m. and 5:00 p.m. Eastern time.
 
                      - Exchanges are accepted by Vanguard only as permitted by
                        your plan. Your plan administrator can explain how
                        frequently exchanges are allowed.
- --------------------------------------------------------------------------------
 
                                       15
<PAGE>   46
 
   
<TABLE>
<S>     <C>                            <C>                         <C>
        [VANGUARD EXPLORER FUND LOGO]                                                     [FLAG LOGO]
        ---------------------------                                                 [VANGUARD EXPLORER FUND LOGO]
        THE VANGUARD GROUP                                                      I  N  S  T  I  T  U  T  I  O  N  A  L
        OF INVESTMENT                                                               P  R  O  S  P  E  C  T  U  S
        COMPANIES                                                             FEBRUARY 23, 1996; REVISED AUGUST 1, 1996
        Vanguard Financial Center                                                       [VANGUARD GROUP LOGO]
        P.O. Box 2900
        Valley Forge, PA 19482

        INSTITUTIONAL PARTICIPANT
        SERVICES DEPARTMENT:
        1-800-523-1188

        TRANSFER AGENT:
        The Vanguard Group, Inc.
        Vanguard Financial Center
        Valley Forge, PA 19482

        I024
</TABLE>
    
 
- --------------------------------------------------------------------------------
<PAGE>   47
 
                                     PART B
 
                          VANGUARD EXPLORER FUND, INC.
 
                      STATEMENT OF ADDITIONAL INFORMATION
 
   
                   FEBRUARY 23, 1996; REVISED AUGUST 1, 1996
    
 
   
     This Statement is not a prospectus but should be read in conjunction with
the Fund's current Prospectus (dated February 23, 1996; revised August 1, 1996).
To obtain the Prospectus please call the Investor Information Department:
    
 
                                 1-800-662-7447
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                                            PAGE
                                                                                            ----
<S>                                                                                         <C>
Investment Objective and Policies.........................................................     1
Purchase of Shares........................................................................     5
Redemption of Shares......................................................................     6
Dividends and Capital Gains Distributions.................................................     6
Yield and Total Return....................................................................     6
Investment Limitations....................................................................     6
Management of the Fund....................................................................     8
Investment Advisory Services..............................................................    11
Portfolio Transactions....................................................................    16
General Information About the Fund........................................................    16
Performance Measures......................................................................    17
Financial Statements......................................................................    19
</TABLE>
    
 
                       INVESTMENT OBJECTIVE AND POLICIES
 
     The following policies supplement the Fund's investment objective and
policies set forth in the Prospectus.
 
     REPURCHASE AGREEMENTS  The Fund may invest in repurchase agreements with
commercial banks, brokers or dealers either for defensive purposes due to market
conditions or to generate income from its excess cash balances. A repurchase
agreement is an agreement under which the Fund acquires a money market
instrument (generally a security issued by the U.S. Government or an agency
thereof, a banker's acceptance or a certificate of deposit) from a commercial
bank, broker or dealer, subject to resale to the seller at an agreed upon price
and date (normally, the next business day). A repurchase agreement may be
considered a loan collateralized by securities. The resale price reflects an
agreed upon interest rate effective for the period the instrument is held by the
Fund and is unrelated to the interest rate on the underlying instrument. In
these transactions, the securities acquired by the Fund (including accrued
interest earned thereon) must have a total value in excess of the value of the
repurchase agreement and are held by a custodian bank until repurchased. In
addition, the Fund's Board of Directors will monitor the Fund's repurchase
agreement transactions generally and will establish guidelines and standards for
review by the investment adviser of the creditworthiness of any bank, broker or
dealer party to a repurchase agreement with the Fund. No more than an aggregate
of 15% of the Fund's assets, at the time of investment, will be invested in
repurchase agreements having maturities longer than seven days and securities
subject to legal or contractual restrictions on resale, or for which there are
no readily available market quotations. See "Restricted or Illiquid Securities"
on page 5.
 
     The use of repurchase agreements involves certain risks. For example, if
the other party to the agreement defaults on its obligation to repurchase the
underlying security at a time when the value of the security has declined, the
Fund may incur a loss upon disposition of the security. If the other party to
the agreement becomes insolvent and subject to liquidation or reorganization
under the Bankruptcy Code or other laws, a court may determine that the
underlying security is collateral for a loan by the Fund not within the control
of the Fund and therefore the realization by the Fund on such collateral may be
automatically stayed. Finally, it
 
                                        1
<PAGE>   48
 
is possible that the Fund may not be able to substantiate its interest in the
underlying security and may be deemed an unsecured creditor of the other party
to the agreement. While the Fund's management acknowledges these risks, it is
expected that they can be controlled through careful monitoring procedures.
 
     LENDING OF SECURITIES  The Fund may lend its portfolio securities to
qualified institutional investors who need to borrow securities in order to
complete certain transactions, such as covering short sales, avoiding failures
to deliver securities, or completing arbitrage operations. By lending its
portfolio securities, the Fund attempts to increase its income through the
receipt of interest on the loan. Any gain or loss in the market price of the
securities loaned that might occur during the term of the loan would be for the
account of the Fund. The Fund may lend its portfolio securities to qualified
brokers, dealers, banks or other financial institutions, so long as the terms
and the structure of such loans are not inconsistent with the Investment Company
Act of 1940, or the Rules and Regulations or interpretations of the Securities
and Exchange Commission thereunder, which currently require that (a) the
borrower pledges and maintains with the Fund collateral consisting of cash, a
letter of credit, or securities issued or guaranteed by the United States
Government having a value at all times not less than 100% of the value of the
securities loaned, (b) the borrower adds to such collateral whenever the price
of the securities loaned rises (i.e., the borrower "marks to the market" on a
daily basis), (c) the loan is made subject to termination by the Fund at any
time, and (d) the Fund receives reasonable interest on the loan (which may
include the Fund's investing any cash collateral in interest bearing short-term
investments), any distributions on the loaned securities and any increase in
their market value. The Fund will not lend portfolio securities if, as a result,
the aggregate of such loans exceeds 33 1/3% of the Fund's total assets. Loan
arrangements made by the Fund will comply with all other applicable regulatory
requirements, including the rules of the New York Stock Exchange, which rules
presently require the borrower, after notice, to redeliver the securities within
the normal settlement time of three business days. All relevant facts and
circumstances, including the creditworthiness of the broker, dealer or
institution, will be considered in making decisions with respect to the lending
of securities, subject to review by the Fund's Board of Directors.
 
     At the present time, the Staff of the Commission does not object if an
investment company pays reasonable negotiated fees in connection with loaned
securities, so long as such fees are set forth in a written contract and
approved by the investment company's directors (trustees). In addition, voting
rights pass with the loaned securities, but if a material event will occur
affecting an investment on loan, the loan must be called and the securities
voted.
 
     FUTURES CONTRACTS AND OPTIONS  The Fund may enter into futures contracts,
options, and options on futures contracts for several reasons: to maintain cash
reserves while simulating full investment, to facilitate trading, to reduce
transaction costs, or to seek higher investment returns when a futures contract
is priced more attractively than the underlying equity security or index.
Futures contracts provide for the future sale by one party and purchase by
another party of a specified amount of a specific security 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 futures contracts by their terms call for actual delivery or
acceptance of the underlying securities, in most cases the contracts are 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" or "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. Futures contracts are customarily purchased and sold on margin that
may range upward from less than 5% of the value of the contract being traded.
 
                                        2
<PAGE>   49
 
     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 in the value of securities otherwise held for investment
purposes or expected to be acquired by them. Speculators are less inclined to
own the securities underlying the futures contracts which they trade, and use
futures contracts with the expectation of realizing profits from fluctuations in
the underlying securities. The Fund intends to use futures contracts only for
bonafide hedging purposes.
 
     Regulations of the CFTC applicable to the Fund require that all of its
futures transactions constitute bonafide hedging transactions. The Fund 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 Fund 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.
 
     Although techniques other than the sale and purchase of futures contracts
could be used to control the Fund's exposure to market fluctuations, the use of
futures contracts may be a more effective means of hedging this exposure. While
the Fund will incur commission expenses in both opening and closing out futures
positions, these costs are lower than transaction costs incurred in the purchase
and sale of the underlying securities.
 
     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 Fund's total assets. In addition, the Fund will not enter into
futures contracts to the extent that its outstanding obligations to purchase
securities under these contracts would exceed 20% of the Fund's total assets.
 
     RISK FACTORS IN FUTURES TRANSACTIONS  Positions in futures contracts 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. In addition, the Fund may be
required to make delivery of the instruments underlying futures contracts it
holds. The inability to close options and futures positions also could have an
adverse impact on the ability of the Fund to hedge its portfolio effectively.
The 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 to both 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 (as well as 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 Advisers
will incorrectly predict future market trends. However, because the futures
strategies of the Fund are engaged in only for hedging purposes, the Fund will
not be subject to the risks of loss frequently associated with futures
transactions. The Fund would presumably have
 
                                        3
<PAGE>   50
 
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 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  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 held 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 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. The Fund may be required to defer the recognition of losses on
futures contracts to the extent of any unrecognized gains on related positions
held by the Fund.
 
     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, gains from the sale of
securities and other income derived with respect to its business of investing in
securities. 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 Fund'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 Fund's fiscal year) on futures transactions. Such
distributions will be combined with distributions of capital gains realized on
the Fund's other investments and shareholders will be advised on the nature of
the payments.
 
     FOREIGN INVESTMENTS  As indicated in the Prospectus, the Fund may invest in
foreign securities to a certain extent. Investors should recognize that
investing in foreign companies involves certain special considerations which are
not typically associated with investing in U.S. companies.
 
     Country Risk  As foreign companies are not generally subject to uniform
accounting, auditing and financial reporting standards and practices comparable
to those applicable to domestic companies, there may be less publicly available
information about certain foreign companies than about domestic companies.
Securities of some foreign companies are generally less liquid and more volatile
than securities of comparable domestic companies. There is generally less
government supervision and regulation of stock exchanges, brokers and listed
companies than in the U.S. In addition, with respect to certain foreign
countries, there is the
 
                                        4
<PAGE>   51
 
possibility of expropriation or confiscatory taxation, political or social
instability, or diplomatic developments which could affect U.S. investments in
those countries.
 
     Although the Fund will endeavor to achieve most favorable execution costs
in its portfolio transactions in foreign securities, fixed commissions on many
foreign stock exchanges are generally higher than negotiated commissions on U.S.
exchanges. In addition, it is expected that the expenses for custodial
arrangements of the Portfolios foreign securities will be somewhat greater than
the expenses for the custodian arrangement for handling U.S. securities of equal
value.
 
     Certain foreign governments levy withholding taxes against dividend and
interest income. Although in some countries a portion of these taxes is
recoverable, the non-recovered portion of foreign withholding taxes will reduce
the income the Fund receives from its foreign investments.
 
     Currency Risk  Since the stocks of foreign companies are frequently
denominated in foreign currencies, and since the Fund may temporarily hold
uninvested reserves in bank deposits in foreign currencies, the Fund will be
affected favorably or unfavorably by changes in currency rates and in exchange
control regulations, and may incur costs in connection with conversions between
various currencies. The investment policies of the Fund permit it to enter into
forward foreign currency exchange contracts in order to hedge holdings and
commitments against changes in the level of future currency rates. Such
contracts involve an obligation to purchase or sell a specific currency at a
future date at a price set at the time of the contract.
 
     RESTRICTED OR ILLIQUID SECURITIES  The Fund is authorized to invest up to
15% of its net assets in restricted or illiquid securities. Illiquid Securities
are securities that may not be sold or disposed of in the ordinary course of
business within seven business days at approximately the value at which they are
being carried on the Fund's books. Restricted securities are those which are not
registered under the Securities Act of 1933 and which are generally issued in
small quantities to institutional or individual investors. Restricted securities
can be sold only in a privately negotiated transaction or after the filing of a
registration statement. The market for such securities is generally illiquid.
 
     If the Fund chooses to sell a restricted security by filing a registration
statement, the filing may involve a considerable delay, during which time the
market value of the security may decline. Because of the illiquid market for
restricted securities, the announcement of the Fund's decision to sell a
restricted security may also depress the security's price. In certain cases, the
Fund may also be obligated to pay all or part of the security's registration
expenses, which may be substantial.
 
     Securities that are unregistered that can be sold to "qualified
institutional buyers" in accordance with Rule 144A under the 1933 Act will not
be considered illiquid for the purpose of this limitation, as long as it is
determined by the Fund's advisor that an adequate trading market exists for the
security.
 
                               PURCHASE OF SHARES
 
     The purchase price of shares of the Fund is the net asset value next
determined after the order is received. The net asset value is calculated as of
the close of the New York Stock Exchange on each day the Exchange is open for
business. An order received prior to the close of the Exchange (generally 4:00
P.M. Eastern time) will be executed at the price computed on the date of
receipt, and an order received after the close of the Exchange will be executed
at the price computed on the next day the Exchange is open.
 
     The Fund reserves the right in its sole discretion (i) to suspend the
offering of its shares, (ii) to reject purchase orders when in the judgment of
management such rejection is in the best interests of the Fund, and (iii) to
reduce or waive the minimum investment for, or any other restrictions on,
initial and subsequent investments for certain fiduciary accounts such as
employee benefit plans or under circumstances where certain economies can be
achieved in sales of the Fund's shares.
 
                                        5
<PAGE>   52
 
                              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 1% of the net assets of the Fund at
the beginning of such period. Such commitment is irrevocable without the prior
approval of the Commission. Redemptions in excess of the above limits may be
paid in whole or in part in readily marketable 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 these securities were
converted 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 Fund's
portfolio securities.
 
                   DIVIDENDS AND CAPITAL GAINS DISTRIBUTIONS
 
     The Fund's policy is to distribute annually substantially all of its net
investment income, if any, together with any net realized capital gains, after
the close of the Fund's fiscal year. Dividend income is expected to be
negligible, and the amount of any capital gains distributions cannot be
predicted.
 
     Any dividend or distribution paid shortly after the purchase of shares by
an investor may have the effect of reducing the per share net asset value by the
per share amount of the dividend or distribution. Furthermore, such dividends or
distributions, although in effect a return of capital, are subject to income
taxes.
 
     Unless the shareholder elects otherwise, dividends and capital gains
distributions are paid in additional shares which are credited to the
shareholder's account. Any dividend and distribution election will remain in
effect until the Fund's Transfer Agent is notified by the shareholder in writing
to change the election at least three days prior to the record date. An account
statement is sent to shareholders whenever an income dividend or capital gains
distribution is paid.
 
                             YIELD AND TOTAL RETURN
 
     The yield of the Fund for the thirty-day period ended October 31, 1995 was
0.48%.
 
     The average annual total returns for the Fund for the one-, five- and
ten-year periods ending October 31, 1995, were +17.46%, +22.79% and +10.75%,
respectively. Total return is computed by determining the average compounded
rates of return over the one-, five- and ten-year 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 LIMITATIONS
 
     The Fund is subject to the following restrictions which may not be changed
without the approval of the lesser of (i) 67 percent or more of the voting
securities present at a meeting if the holders of more than 50 percent of the
outstanding voting securities of the Fund are present or represented by proxy,
or (ii) more than 50 percent of the outstanding voting securities of the Fund.
The Fund will not:
 
      1) make investments in commodities or real estate, although it may
         purchase and sell securities of companies which deal in real estate or
         interests therein, and except that the Fund may invest in stock futures
         contracts and stock options (only for hedging purposes) to the extent
         that not more than 5%
 
                                        6
<PAGE>   53
 
         of its assets are required as deposit to secure obligations under
         futures contracts and not more than 20% of its assets are invested in
         futures contracts and options at any time;
 
      2) make loans, except (i) by purchasing bonds, debentures or similar
         obligations (including repurchase agreements) which are either publicly
         distributed or customarily purchased by institutional investors and
         (ii) as provided under "Lending of Securities" (page 2);
 
      3) engage in the business of underwriting securities issued by others
         except to the extent that the Fund may technically be deemed to be an
         underwriter under the Securities Act of 1933, as amended, in disposing
         of portfolio securities;
 
      4) purchase or otherwise acquire illiquid securities 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.);
 
      5) purchase securities on margin or make short sales except as specified
         in investment limitation No. 1 above;
 
      6) invest more than 25% of its assets in any one industry;
 
      7) invest for the purpose of exercising control over management of any
         company;
 
      8) invest its assets in the securities of other investment companies
         except as may be acquired as part of a merger, consolidation or
         acquisition of assets approved by the Fund's shareholders or otherwise
         to the extent permitted by Section 12 of the Investment Company Act of
         1940. The Fund will invest only in investment companies which have
         investment objectives and investment policies consistent with those of
         the Fund;
 
      9) 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;
 
     10) pledge, mortgage, or hypothecate any of its assets to an extent greater
         than 10% of its total assets at fair market value; and
 
     11) borrow money, except that the Fund may borrow from banks (or through
         reverse repurchase agreements), for temporary or emergency (not
         leveraging) purposes, including the meeting of redemption requests
         which might otherwise require the untimely disposition of securities,
         in an amount not exceeding 15% of the value of the Fund's net assets
         (including the amount borrowed and the value of any outstanding reverse
         repurchase agreements) at the time the borrowing is made. Whenever
         borrowings exceed 5% of the value of the Fund's net assets, the Fund
         will not make any additional investments.
 
     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 or related services to the
Fund and other investment companies. See "Management of the Fund."
 
     The above-mentioned limitations are considered at the time investment
securities are purchased.
 
     Although not a fundamental policy subject to shareholder vote, as long as
the Fund's shares are registered for sale in certain states, the Fund will not
(i) except as permitted above in investment limitation No. 1; (ii) invest in
interests in oil, gas or other mineral exploration or development programs;
(iii) purchase securities of any company which has (with predecessors) a record
of less than three years continuous operation if as a result more than 5% of the
Fund's assets would be invested in securities of such companies; and (iv)
purchase or retain securities of an issuer if an officer or director of such
issuer is an officer or Director of the Fund or its investment adviser and one
or more of such officers or Directors of the Fund or its investment adviser owns
beneficially more than 1/2% of the shares or securities of such issuer and all
such Directors and officers owning more than 1/2% of such shares or securities
together own more than 5% of such shares or securities.
 
                                        7
<PAGE>   54
 
                             MANAGEMENT OF THE FUND
 
OFFICERS AND DIRECTORS
 
     The Fund's Officers, under the supervision of the Board of Directors,
manage the day-to-day operations of the Fund. The Directors, who are elected
annually by shareholders, set broad policies for the Fund and choose its
Officers. A list of the Directors and Officers of the Fund and a brief statement
of their present positions and principal occupations during the past five years
is set forth below.
 
     The mailing address of the Fund's Directors and officers is Post Office Box
876, Valley Forge, PA 19482.
 
JOHN C. BOGLE, Chairman and Director*
     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, Chief Executive Officer and Director*
     President, Chief Executive Officer and Director of The Vanguard Group, Inc.
     and of each of the investment companies in The Vanguard Group.
 
ROBERT E. CAWTHORN, Director
   
     Chairman Emeritus of Rhone-Poulenc Rorer, Inc.; Director of Sun Company,
     Inc.
    
 
BARBARA BARNES HAUPTFUHRER, Director
     Director of The Great Atlantic and Pacific Tea Company, ALCO Standard
     Corp., Raytheon Company, Knight-Ridder, Inc., and Massachusetts Mutual Life
     Insurance Co. and Trustee Emerita of Wellesley College.
 
BRUCE K. MACLAURY, Director
   
     President Emeritus of The Brookings Institution; Director of American
     Express Bank, Ltd., The St. Paul Companies, Inc., and National Steel
     Corporation.
    
 
BURTON G. MALKIEL, Director
     Chemical Bank Chairman's Professor of Economics, Princeton University;
     Director of Prudential Insurance Co. of America, Amdahl Corporation, Baker
     Fentress & Co., The Jeffrey Co., and Southern New England Communications
     Company.
 
ALFRED M. RANKIN, JR., Director
     Chairman, President, and Chief Executive Officer of NACCO Industries, Inc.;
     Director of The BFGoodrich Company, and The Standard Products Company.
 
JOHN C. SAWHILL, Director
     President and Chief Executive Officer, The Nature Conservancy; formerly,
     Director and Senior Partner, McKinsey & Co.; President, New York
     University; Director of Pacific Gas and Electric Company and NACCO
     Industries.
 
JAMES O. WELCH, JR., Director
     Retired Chairman of Nabisco Brands, Inc. retired Vice Chairman and Director
     of RJR Nabisco; Director of TECO Energy, Inc.; and Director of Kmart
     Corporation.
 
J. LAWRENCE WILSON, Director
     Chairman and Chief Executive Officer of Rohm & Haas Company; Director of
     Cummins Engine Company; and Trustee of Vanderbilt University.
 
RAYMOND J. KLAPINSKY, Secretary*
     Senior Vice President and Secretary of The Vanguard Group, Inc.; Secretary
     of each of the investment companies in The Vanguard Group.
 
RICHARD F. HYLAND, Treasurer*
     Treasurer of The Vanguard Group, Inc. and of each of the investment
     companies in The Vanguard Group.
 
KAREN E. WEST, Controller*
     Vice President of The Vanguard Group, Inc.; Controller of each of the
     investment companies in The Vanguard Group.
 
- ---------------
 
*Officers of the Fund are "interested persons" as defined in the Investment
 Company Act of 1940.
 
VANGUARD GROUP
 
     Vanguard Explorer Fund is a member of The Vanguard Group of Investment
Companies, which consists of more than 30 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
 
                                        8
<PAGE>   55
 
management, administrative and distribution services. Vanguard also provides
investment advisory services on an at-cost basis to some 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 procedures approved by the Board of Directors (Trustees) of each
Fund. In addition, each Fund bears its own direct expenses, such as legal,
auditing and custodian fees.
 
     The Fund's Officers are also Officers and employees of Vanguard. No Officer
or employee owns, or is permitted to own, any securities of any external adviser
for the Funds.
 
     The Vanguard Group adheres to a Code of Ethics established pursuant to Rule
17j-1 under the Investment Company Act of 1940. The Code is designed to prevent
unlawful practices in connection with the purchase or sale of securities by
persons associated with Vanguard. Under Vanguard's Code of Ethics certain
officers and employees of Vanguard who are considered access persons are
permitted to engage in personal securities transactions. However, such
transactions are subject to procedures and guidelines substantially similar to
those recommended by the mutual fund industry and approved by the U.S.
Securities and Exchange Commission.
 
     The Vanguard Group was established and operates under a Funds' Service
Agreement which was approved by the shareholders of each of the Funds. The
Fund's Service Agreement provides for the following arrangement: (a) each
Vanguard Fund may invest up to .40% of its current net assets in Vanguard, and
(b) there is no limit on the amount that each Vanguard Fund may contribute to
Vanguard's capitalization. The amounts which each of the Funds has invested are
adjusted from time to time in order to maintain the proportionate relationship
between each Fund's relative net assets and its contribution to Vanguard's
capital. At October 31, 1995, Vanguard Explorer Fund had contributed capital of
$188,000 to Vanguard, representing .9% of Vanguard's capitalization.
 
     MANAGEMENT  Corporate management and administrative services include: (1)
executive staff; (2) accounting and financial; (3) legal and regulatory; (4)
shareholder account maintenance; (5) monitoring and control of custodian
relationships; (6) shareholder reporting; and (7) review and evaluation of
advisory and other services provided to the Funds by third parties. During the
fiscal year ended October 31, 1995, the Fund's share of Vanguard's actual net
costs of operation relating to management and administrative services (including
transfer agency) totaled approximately $4,586,000.
 
     DISTRIBUTION  Vanguard provides all distribution and marketing activities
for the Funds in the Group. Vanguard Marketing Corporation, a wholly-owned
subsidiary of The Vanguard Group, Inc., acts as Sales Agent for 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 their relative net assets. The remaining
one half of these 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 the 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 October 31,
1995, the Fund paid approximately $232,000 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.
 
                                        9
<PAGE>   56
 
     INVESTMENT ADVISORY SERVICES  Vanguard also provides investment advisory
services to: Vanguard Money Market Reserves; Vanguard Municipal Bond Fund,
several Portfolios of Vanguard Fixed Income Securities Fund; Vanguard Bond Index
Fund; Vanguard California Tax-Free Fund; Vanguard New Jersey Tax-Free Fund;
Vanguard Florida Insured Tax-Free Fund; Vanguard New York Insured Tax-Free Fund;
Vanguard Pennsylvania Tax-Free Fund; Vanguard Ohio Tax-Free Fund; Vanguard Index
Trust; Vanguard International Equity Index Fund; Vanguard Balanced Index Fund;
Vanguard Institutional Index Fund; several Portfolios of Vanguard Variable
Insurance Fund, Vanguard Admiral Funds, Vanguard Tax-Managed Fund, Aggressive
Growth Portfolio of Vanguard Horizon Fund, a portion of Vanguard/Windsor II, a
portion of Vanguard/Morgan Growth Fund as well as several indexed separate
accounts. 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 fiscal year ended October 31, 1995, the Fund paid approximately
$6,000 in Directors' fees and expenses to its "non-interested" Directors. The
Fund's proportionate share of remuneration paid by Vanguard (and reimbursed by
the Fund) during the fiscal year to all officers of the Fund, as a group, was
approximately $44,602.
 
     Under its retirement plan, Vanguard contributes annually an amount equal to
10% of each eligible Officer's annual compensation plus 7% of that part of the
eligible Officer's compensation during the year, if any, that exceeds the Social
Security Taxable Wage Base then in effect. Under Vanguard's thrift plan, all
eligible Officers are permitted to make pre-tax basic contributions in a maximum
amount equal to 4% of total compensation which are matched by Vanguard on a 100%
basis. Directors who are not Officers are paid an annual fee based on the number
of years of service on the board, up to 15 years of service, upon retirement.
The fee is equal to $1,000 for each year of service and each investment company
member of The Vanguard Group contributes a proportionate amount to this fee
based on its relative net assets. This fee is paid, subsequent to a Director's
retirement, for a period of ten years or until the death of a retired Director.
The Fund's proportionate share of retirement benefits paid by Vanguard on behalf
of all eligible officers of the Fund, as a group, during the fiscal year ended
October 31, 1995 was approximately $1,350.
 
     The following table provides detailed information with respect to the
amounts paid or accrued for the Directors for the fiscal year ended October 31,
1995.
 
                             VANGUARD EXPLORER FUND
                               COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                AGGREGATE       PENSION OR RETIREMENT        ESTIMATED          TOTAL COMPENSATION
                               COMPENSATION      BENEFITS ACCRUED AS      ANNUAL BENEFITS     FROM ALL VANGUARD FUNDS
    NAMES OF DIRECTORS          FROM FUND       PART OF FUND EXPENSES     UPON RETIREMENT      PAID TO DIRECTORS(3)
- ---------------------------    ------------     ---------------------     ---------------     -----------------------
<S>                            <C>              <C>                       <C>                 <C>
John C. Bogle(1),(2)                 --                    --                      --                      --
John J. Brennan(2)                   --                    --                      --                      --
Barbara Barnes Hauptfuhrer         $642                 $ 108                 $15,000                 $60,000
Robert E. Cawthorn                 $642                 $  90                 $13,000                 $60,000
Bruce K. MacLaury                  $696                 $ 106                 $12,000                 $55,000
Burton G. Malkiel                  $642                 $  72                 $15,000                 $60,000
Alfred M. Rankin, Jr.              $642                 $  57                 $15,000                 $60,000
John C. Sawhill                    $642                 $  67                 $15,000                 $60,000
James O. Welch, Jr.                $642                 $  83                 $15,000                 $60,000
J. Lawrence Wilson                 $642                 $  60                 $15,000                 $60,000
</TABLE>
 
(1) For the period reported in this table, Mr. Bogle was the Fund's Chief
    Executive Officer, and therefore an "Interested Director."
(2) As "Interested Directors," Messrs. Bogle and Brennan receive no compensation
    for their service as directors. Compensation amounts reported for Messrs.
    Bogle and Brennan relate to their respective positions as Chief Executive
    Officer and President of the Fund.
(3)The amounts reported in this column reflect the total compensation paid to
   each Director for their service as Director or Trustee of 34 Vanguard Funds
   (27 in the case of Mr. MacLaury).
 
                                       10
<PAGE>   57
 
                          INVESTMENT ADVISORY SERVICES
 
     The Fund currently employs two investment advisers: Wellington Management
Company ("WMC"), 75 State Street, Boston, MA 02109; and Granahan Investment
Management, Inc. ("Granahan"), 275 Wyman Street, Waltham, MA 02154. Until
February 28, 1990, when the Fund acquired the assets of Explorer II, WMC was
sole investment adviser to the Fund (then known simply as Explorer Fund), and
Granahan served as sole investment adviser to Explorer II, the acquired fund.
 
     The proportion of the net assets of the Fund managed by each adviser was
established by the Board of Directors effective with the acquisition of Explorer
II, and may be changed in the future by the Board of Directors as circumstances
warrant. Investors will be advised of any substantive change in the proportions
managed by each adviser. Because the Fund employs two advisers it is possible
that the advisers would purchase or sell the same security at the same time.
Such a situation might result in increased brokerage costs or adverse tax
consequences to the Fund. The Board of Directors monitors portfolio activity in
order to minimize any possible adverse consequences.
 
WELLINGTON MANAGEMENT COMPANY
 
     The Fund has entered into an advisory agreement with WMC under which WMC
manages the investment and reinvestment of a portion of the Fund's assets (the
"WMC Portfolio") and continuously reviews, supervises and administers the Fund's
investment program with respect to those assets. As of October 31, 1995, WMC
managed approximately 44% of the Fund's net assets. WMC discharges its
responsibilities subject to the control of the officers and Directors of the
Fund.
 
     WMC is a professional investment counseling firm which provides investment
services to investment companies, other institutions and individuals. WMC is a
Massachusetts general partnership of which the following persons are managing
partners: Robert W. Doran, Duncan M. McFarland and John R. Ryan.
 
     The Fund pays WMC 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 average month-end net assets of the WMC Portfolio for the quarter:
 
   
<TABLE>
<CAPTION>
                                         NET ASSETS          RATE
                                 --------------------        -----
                              <S>                            <C>
                              First $500 million             .250%
                              Next $250 million              .200%
                              Next $250 million              .150%
                              Assets in excess of $1
                                billion                      .100%
</TABLE>
    
 
   
     The Basic Fee, as provided above, shall be increased or decreased by
applying an incentive/penalty fee adjustment based on the investment performance
of the WMC Portfolio relative to the investment performance of the Russell 2000
Small Stock Index (the "Index").
    
 
   
     The following table sets forth the adjustment factors to the base advisory
fee payable by the Fund to WMC under this investment advisory agreement:
    
 
   
<TABLE>
<CAPTION>
     CUMULATIVE 36-MONTH
PERFORMANCE VERSUS THE INDEX
- -----------------------------     PERFORMANCE FEE
                                    ADJUSTMENT*
                                 ------------------
<S>                              <C>
Less than -12%                    -0.50 X Basic Fee
Between -12% and -6%              -0.25 X Basic Fee
Between -6% and 6%                 0.00 X Basic Fee
Between 6% and 12%                +0.25 X Basic Fee
More than 12%                     +0.50 X Basic Fee
</TABLE>
    
 
- ---------------
 
   
* For purposes of this calculation, the basic fee is calculated by applying the
  quarterly rate against average assets over the 36-month period.
    
 
                                       11
<PAGE>   58
 
   
     For the purpose of determining the fee adjustment for investment
performance, as described above, the net assets of the WMC Portfolio shall be
averaged over the same period as the investment performance of the WMC Portfolio
and the investment record of the Index are computed.
    
 
   
     Under the rules of the Securities and Exchange Commission, the new
incentive/penalty fee will not be fully operable until the quarter ending July
31, 1999. Until that date, a "blended" fee rate consisting of varying
percentages of (i) the performance adjustment based on the schedule set forth
above (the "new rate"), and (ii) the performance adjustment based on the
schedule set forth in the Fund's previous investment advisory agreement with
WMC1 (the "previous rate") shall be used as follows:
    
 
   
     1. QUARTER ENDING OCTOBER 31, 1996.  The incentive/penalty fee shall be
calculated as the sum of 8.3% (e.g., one of 12 quarters) of the fee payable
under the new rate plus 91.7% (e.g., 11 of 12 quarters) of the fee payable under
the previous rate.
    
 
   
     2. QUARTER ENDING JANUARY 31, 1997.  The incentive/penalty fee shall be
calculated as the sum of 16.7% of the fee payable under the new rate plus 83.3%
of the fee payable under the previous rate.
    
 
   
     3. QUARTER ENDING APRIL 30, 1997.  The incentive/penalty fee shall be
calculated as the sum of 25% of the fee payable under the new rate plus 75% of
the fee payable under the previous rate.
    
 
   
     4. QUARTER ENDING JULY 31, 1997.  The incentive/penalty fee shall be
calculated as the sum of 33% of the fee payable under the new rate plus 67% of
the fee payable under the previous rate.
    
 
   
     5. QUARTER ENDING OCTOBER 31, 1997.  The incentive/penalty fee shall be
calculated as the sum of 41.6% of the fee payable under the new rate plus 58.4%
of the fee payable under the previous rate.
    
 
   
     6. QUARTER ENDING JANUARY 31, 1998.  The incentive/penalty fee shall be
calculated as the sum of 50% of the fee payable under the new rate plus 50% of
the fee payable under the previous rate.
    
 
   
     7. QUARTER ENDING APRIL 30, 1998.  The incentive/penalty fee shall be
calculated as the sum of 58.4% of the fee payable under the new rate plus 41.6%
of the fee payable under the previous rate.
    
 
   
     8. QUARTER ENDING JULY 31, 1998.  The incentive/penalty fee shall be
calculated as the sum of 67% of the fee payable under the new rate plus 33% of
the fee payable under the previous rate.
    
 
   
     9. QUARTER ENDING OCTOBER 31, 1998.  The incentive/penalty fee shall be
calculated as the sum of 75% of the fee payable under the new rate plus 25% of
the fee payable under the previous rate.
    
 
   
     10. QUARTER ENDING JANUARY 31, 1999.  The incentive/penalty fee shall be
calculated as the sum of 83.3% of the fee payable under the new rate plus 16.7%
of the fee payable under the previous rate.
    
 
   
     11. QUARTER ENDING APRIL 30, 1999.  The incentive/penalty fee shall be
calculated as the sum of 91.7% of the fee payable under the new rate plus 8.3%
of the fee payable under the previous rate.
    
 
   
     12. QUARTER ENDING JULY 31, 1999.  New rate fully operable.
    
 
     The investment performance of the WMC Portfolio for any period, expressed
as a percentage of the "WMC Portfolio unit value" at the beginning of such
period, is the sum of: (i) the change in the WMC Portfolio unit value during
such period; (ii) the unit value of the Fund's cash distributions from the WMC
Portfolio net investment income and realized net capital gains (whether
long-term or short-term) having an ex-dividend date occurring within such
period; and (iii) the unit value of capital gains taxes paid or accrued during
such period by the Fund for undistributed realized long-term capital gains
realized from the WMC Portfolio.
 
- ---------------
 
   
1The previous incentive/penalty fee structure provided that the Basic Fee be
increased or decreased by an amount equal to .0375% per annum (.009375 of 1% per
quarter) of the average month-end assets if the Fund's investment performance
for the 36 months preceding the end of the quarter was between 6 and 12
percentage points above or below, respectively, the investment record of the
Russell 2000 Small Company Stock Index and .075% per annum (.01875 of 1% per) of
the average month-end assets of the Fund if the Fund's investment performance
for the 36 months preceding the end of the quarter was twelve percentage points
or more above or below, respectively, the investment record of the Russell 2000
Small Stock Index.
    
 
                                       12
<PAGE>   59
 
     The "WMC Portfolio unit value" is determined by dividing the total net
assets of the WMC Portfolio by a given number of units. On the initial date of
the agreement, the number of units in the WMC Portfolio will equal the total
shares outstanding of the Fund. After such initial date, as assets are added to
or are withdrawn from the WMC Portfolio, the number of units of the WMC
Portfolio is adjusted based on the unit value of the WMC Portfolio on the day
such changes are executed.
 
     The investment record of the Russell 2000 for any period, expressed as a
percentage of the Russell 2000 at the beginning of such period, is the sum of
(i) the change in the level of the Russell 2000 during such period and (ii) the
value, computed consistently with the Russell 2000, of cash distributions having
an ex-dividend date occurring within such period made by companies whose
securities comprise the Russell 2000. For this purpose cash distributions on the
securities which comprise the Russell 2000 shall be treated as reinvested in the
Russell 2000 at least as frequently as the end of each calendar quarter
following the payment of the dividend.
 
     For the purposes of determining the fee adjustment for investment
performance, the net assets of the WMC Portfolio are averaged over the same
period as the investment performance of the WMC Portfolio and the investment
record of the Russell 2000 are computed.
 
     Any computation of the investment performance of the WMC Portfolio and the
investment record of the Russell 2000 shall be subject to and in accordance with
any then applicable rules of the Securities and Exchange Commission.
 
     During the fiscal years ended October 31, 1993, 1994, and 1995, the Fund
paid WMC approximately the following advisory fees:
 
<TABLE>
<CAPTION>
                                                     1993         1994         1995
                                                  ----------   ----------   ----------
            <S>                                   <C>          <C>          <C>
            Basic Fee...........................  $1,181,674   $1,362,455   $1,698,254
            Increase (Decrease) for Performance
              Adjustment........................     (79,280)     (61,905)     (44,661)
                                                  ----------   ----------   ----------
                 Total..........................  $1,102,394   $1,300,550   $1,653,593
                                                  ==========   ==========   ==========
</TABLE>
 
   
     These fees were paid under a previous fee schedule that provided for a
higher rate of fees.
    
 
   
     The agreement with WMC continues until July 31, 1998. The agreement is
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 Directors 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 of the
agreement may be presented to the shareholders of the Fund; in such event
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 sixty (60) days' written notice to WMC, or
(2) by WMC upon ninety (90) days' written notice to the Fund.
    
 
GRANAHAN INVESTMENT MANAGEMENT, INC.
 
     On February 28, 1990, effective with the acquisition of the assets of
Explorer II, the Fund retained Granahan Investment Management, Inc. ("Granahan")
as a second investment adviser. Under its advisory agreement with the Fund,
Granahan manages the investment and reinvestment of a portion of the Fund's
assets (the "Granahan Portfolio") and continuously reviews, supervises and
administers the Fund's investment program with respect to those assets. As of
October 31, 1995, Granahan managed approximately 43% of the Fund's net assets.
Granahan discharges its responsibilities subject to the control of the officers
and Directors of the Fund.
 
                                       13
<PAGE>   60
 
     The Fund pays Granahan 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 average month-end net assets of the Granahan Portfolio
for the quarter:
 
   
<TABLE>
<CAPTION>
                                         NET ASSETS          RATE
                                 --------------------        -----
                              <S>                            <C>
                              First $500 million             .300%
                              Next $250 million              .200%
                              Next $250 million              .150%
                              Assets in excess of $1
                                billion                      .100%
</TABLE>
    
 
     The Basic Fee paid to Granahan may be increased or decreased by applying an
adjustment formula based on the investment performance of the net assets of the
Granahan Portfolio. Such formula provides for an increase or decrease in
Granahan's Basic Fee in an amount equal to .075% per annum (.01875 of 1% per
quarter) of the average month-end net assets of the Granahan Portfolio if the
investment performance of the Granahan Portfolio for the thirty-six months
preceding the end of the quarter is twelve percentage points or more above or
below, respectively, the investment record of the Russell 2000 Stock Index (the
"Russell 2000") for the same period; or by an amount equal to .0375% per annum
(.009375 of 1% per quarter) if the investment performance of the Granahan
Portfolio for such thirty-six months is six or more but less than twelve
percentage points above or below, respectively, the investment record of the
Russell 2000 for the same period. The incentive portion of the fee may be earned
even if the performance of the Granahan Portfolio for the period is negative
provided that the Portfolio's performance exceeds the Russell 2000 by the
required percentage.
 
     The investment performance of the Granahan Portfolio for any period,
expressed as a percentage of the "Granahan Portfolio unit value" at the
beginning of such period, is the sum of: (i) the change in the Granahan
Portfolio unit value during such period; (ii) the unit value of the Fund's cash
distributions from the Granahan Portfolio net investment income and realized net
capital gains (whether long-term or short-term) having an ex-dividend date
occurring within such period; and (iii) the unit value of capital gains taxes
paid or accrued during such period by the Fund for undistributed realized
long-term capital gains realized from the Granahan Portfolio.
 
     The "Granahan Portfolio unit value" is determined by dividing the total net
assets of the Granahan Portfolio by a given number of units. On the initial date
of the agreement, the number of units in the Granahan Portfolio equalled the
total shares outstanding of the Fund. After such initial date, as assets are
added to or are withdrawn from the Granahan Portfolio, the number of units of
the Granahan Portfolio is adjusted based on the unit value of the Granahan
Portfolio on the day such changes are executed.
 
     The investment record of the Russell 2000 for any period, expressed as a
percentage of the Russell 2000 at the beginning of such period, is the sum of
(i) the change in the level of the Russell 2000 during such period and (ii) the
value, computed consistently with the Russell 2000, of cash distributions having
an ex-dividend date occurring within such period made by companies whose
securities comprise the Russell 2000. For this purpose cash distributions on the
securities which comprise the Russell 2000 shall be treated as reinvested in the
Russell 2000 at least as frequently as the end of each calendar quarter
following the payment of the dividend.
 
     For the purposes of determining the fee adjustment for investment
performance, the net assets of the Granahan Portfolio are averaged over the same
period as the investment performance of the Granahan Portfolio and the
investment record of the Russell 2000 are computed.
 
     Any computation of the investment performance of the Granahan Portfolio and
the investment record of the Russell 2000 shall be subject to and in accordance
with any then applicable rules of the Securities and Exchange Commission.
 
                                       14
<PAGE>   61
 
     During the fiscal years ended October 31, 1993, 1994 and 1995, the Fund
paid Granahan approximately the following advisory fees:
 
<TABLE>
<CAPTION>
                                                 1993           1994           1995
                                              ----------     ----------     ----------
            <S>                               <C>            <C>            <C>
            Basic Fee.......................  $  936,872     $1,397,812     $1,799,069
            Increase (Decrease) for
              Performance Adjustment........     116,432         40,525         69,595
                                              ----------     ----------     ----------
                 Total......................  $1,053,304     $1,438,337     $1,868,664
                                              ==========     ==========     ==========
</TABLE>
 
   
     These fees were paid under a previous fee schedule that provided for a
higher rate of fees.
    
 
   
     The agreement continues until July 31, 1998 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 Directors 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 of the agreement may be
presented to the shareholders of the Fund; in such event, such 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 Granahan, or (2) by
Granahan upon 90 days' written notice to the fund.
    
 
     In April 1972, the Securities and Exchange Commission ("SEC") issued
Release No. 7113 under the Investment Company Act of 1940 to call attention of
directors and investment advisers to certain factors which must be considered in
connection with investment company incentive fee arrangements. One of these
factors is to "avoid basing significant fee adjustments upon random or
insignificant differences" between the investment performance of a fund and that
of the particular index with which it is being compared. The Release provides
that "preliminary studies (of the SEC staff) indicate that as a 'rule of thumb'
the performance difference should be at least 10 percentage points" annually
before the maximum performance adjustment may be made. However, the Release also
states that "because of the preliminary nature of these studies, the Commission
is not recommending, at this time, that any particular performance difference
exist before the maximum fee adjustment may be made." The Release concludes that
the directors of a fund "should satisfy themselves that the maximum performance
adjustment will be made only for performance differences that can reasonably be
considered "significant." The Board of Directors of Vanguard Explorer Fund has
fully considered the SEC Release and believes that the performance adjustments
as included in the above mentioned agreements are appropriate, although not
within the 10 percentage point per year range suggested in the Release. Under
the proposed investment advisory agreement between Vanguard Explorer Fund and
Granahan, and Vanguard Explorer Fund and WMC, the maximum performance adjustment
is made at a difference of 12 percentage points from the performance of the
index over a thirty-six month period, which would effectively be the equivalent
of approximately 4 percentage points difference per year.
 
     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.
 
                                       15
<PAGE>   62
 
                             PORTFOLIO TRANSACTIONS
 
     The investment advisory agreements authorize WMC and Granahan (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
direct the advisers to use their best efforts to obtain the best available price
and most favorable execution as to all transactions for the Fund. WMC and
Granahan have undertaken 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, WMC and Granahan will use their 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 WMC
or Granahan. WMC and Granahan consider such information useful in the
performance of its obligations under the agreement but are unable to determine
the amount by which such services may reduce its expenses.
 
     The investment advisory agreements also incorporate 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, WMC and Granahan 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 WMC and Granahan to the Fund and the other Funds in the
Group.
 
     Currently, it is the Fund's policy that WMC and Granahan 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 advisers will only pay such higher
commissions if they believe 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 WMC, Granahan and/or the Fund.
 
     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.
 
     During the fiscal years ended October 31, 1993, 1994 and 1995 the Fund paid
$452,558, $1,627,910 and $1,889,236 in brokerage commissions, respectively.
 
     Some securities considered for investment by the Fund may also be
appropriate for other Funds and/or clients served by WMC or Granahan. If
purchase or sale of securities consistent with the investment policies of the
Fund and one or more of these other Funds or clients served by the advisers are
considered at or about the same time, transactions in such securities will be
allocated among the several Funds and clients in a manner deemed equitable by
WMC or Granahan.
 
                       GENERAL INFORMATION ABOUT THE FUND
 
DESCRIPTION OF SHARES AND VOTING RIGHTS
 
     The Fund was established under Pennsylvania law under a Declaration of
Trust dated April 17, 1984. The Fund was reorganized as a Maryland corporation
on December 31, 1986. On February 28, 1990, the Fund acquired the assets of
Explorer II, Inc., an investment company that was a member of The Vanguard Group
and
 
                                       16
<PAGE>   63
 
that had investment objectives and policies similar to those of the Fund. Also,
on that date the Fund retained Granahan Investment Management Inc., investment
adviser to Explorer II, as the Fund's second adviser and adopted its new name.
 
     The Fund's Amended and Restated Articles of Incorporation permit the
Directors to issue 100,000,000 shares of common stock, with a $.001 par value.
The Board of Directors has the power to designate one or more classes
("Portfolios") of shares of common stock and to classify or reclassify any
unissued shares with respect to such Portfolios. Currently, the Fund is offering
one class of shares.
 
     The shares of the Fund are fully paid and nonassessable, and have no
preferences as to conversion, exchange, dividends, retirement or other features.
The shares have no pre-emptive rights. Such shares have non-cumulative voting
rights, which means that the holders of more than 50% of the shares voting for
the election of Directors can elect 100% of the Directors if they choose to do
so. A shareholder is entitled to one vote for each full share held (and a
fractional vote for each fractional share held), then standing in his name on
the books of the Fund.
 
                              PERFORMANCE MEASURES
 
     Vanguard may use reprinted material discussing The Vanguard Group, Inc. or
any of the member funds of The Vanguard Group of investment companies.
 
     The Fund may use one or more, either singularly or in a composite, of the
following unmanaged indexes for comparative performance purposes:
 
STANDARD & POOR'S 500 COMPOSITE STOCK PRICE INDEX -- is a well-diversified list
of 500 companies representing the U.S. Stock Market.
 
WILSHIRE 5000 EQUITY INDEX -- consists of more than 6,000 common equity
securities, covering all stocks in the U.S. for which daily pricing is
available.
 
WILSHIRE 4500 EQUITY INDEX -- consists of all stocks in the Wilshire 5000 except
for the 500 stocks in the Standard & 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 LONG-TERM TREASURY BOND -- is composed of all bonds covered by the
Shearson Lehman Hutton Treasury Bond Index with maturities of 10 years or
greater.
 
MERRILL LYNCH CORPORATE & GOVERNMENT BOND -- consists of over 4,500 U.S.
Treasury, Agency and investment grade corporate bonds.
 
LEHMAN CORPORATE (BAA) BOND INDEX -- all publicly offered fixed rate,
nonconvertible domestic corporate bonds rated Baa by Moody's, with a maturity
longer than 1 year and with more than $25 million outstanding. This index
includes over 1,000 issues.
 
LEHMAN BROTHERS LONG-TERM CORPORATE BOND INDEX -- is a subset of the Lehman
Corporate Bond Index covering all corporate, publicly issued, fixed-rate,
nonconvertible U.S. debt issues rated at least Baa, with at least $50 million
principal outstanding and maturity greater than 10 years.
 
                                       17
<PAGE>   64
 
BOND BUYER MUNICIPAL INDEX (20 YEAR) BOND -- is a yield index on current coupon
high-grade general obligation municipal bonds.
 
STANDARD & POOR'S PREFERRED INDEX -- is a yield index based upon the average
yield of four high-grade, noncallable preferred stock issues.
 
NASDAQ INDUSTRIAL INDEX -- is composed of more than 3,000 industrial issues. It
is a value-weighted index calculated on price change only and does not include
income.
 
COMPOSITE INDEX -- 70% Standard & Poor's 500 Index and 30% NASDAQ Industrial
Index.
 
COMPOSITE INDEX -- 35% Standard & Poor's 500 Index and 65% Lehman Brothers
Long-Term Corporate Bond Index.
 
COMPOSITE INDEX -- 65% Standard & Poor's 500 Index and 35% Salomon Brothers
High-Grade Bond Index.
 
LEHMAN BROTHERS AGGREGATE BOND INDEX -- is a market-weighted index that contains
individually priced U.S. Treasury, agency, corporate, and mortgage pass through
securities corporate rated BBB- or better. The index has a market value of over
$4 trillion.
 
LEHMAN BROTHERS MUTUAL FUND SHORT (1-5) GOVERNMENT/CORPORATE INDEX -- is a
market-weighted index that contains individually priced U.S. Treasury, agency,
and corporate investment grade bonds rated BBB- or better with maturities
between 1 and 5 years. The index has a market value of over $1.3 trillion.
 
LEHMAN BROTHERS MUTUAL FUND INTERMEDIATE (5-10) GOVERNMENT/CORPORATE INDEX -- is
a market-weighted index that contains individually priced U.S. Treasury, agency,
and corporate securities rated BBB- or better with maturities between 5 and 10
years. The index has a market value of over $600 billion.
 
LEHMAN BROTHERS MUTUAL FUND LONG (10+) GOVERNMENT/CORPORATE INDEX -- is a
market-weighted index that contains individually priced U.S. Treasury, agency
and corporate securities rated BBB- or better with maturities greater than 10
years. The index has a market value of over $900 billion.
 
LIPPER SMALL COMPANY GROWTH FUND AVERAGE -- the average performance of small
company growth funds as defined by Lipper Analytical Services, Inc. Lipper
defines a small company growth fund as a fund that by prospectus or portfolio
practice, limits its investments to companies on the basis of the size of the
company. From time to time, Vanguard may advertise using the average performance
and/or the average expense ratio of the small company growth funds. (This fund
category was first established in 1982. For years prior to 1982, the results of
the Lipper Small Company Growth category were estimated using the returns of the
Funds that constituted the Group at its inception.)
 
RUSSELL 3000 INDEX -- consists of approximately the 3,000 largest stocks of
U.S.-domiciled companies commonly traded on the New York and American Stock
Exchanges or the NASDAQ over-the-counter market, accounting for over 90% of the
market value of publicly traded Stocks in the U.S.
 
RUSSELL 2000 STOCK INDEX -- consists of the smallest 2,000 stocks within the
Russell 3000; a widely used benchmark for small capitalization common stocks.
 
LIPPER BALANCED FUND AVERAGE -- an industry benchmark of average balanced funds
with similar investment objectives and policies, as measured by Lipper
Analytical Services, Inc.
 
LIPPER NON-GOVERNMENT MONEY MARKET FUND AVERAGE -- an industry benchmark of
average non-government money market funds with similar investment objectives and
policies, as measured by Lipper Analytical Services, Inc.
 
LIPPER GOVERNMENT MONEY MARKET FUND AVERAGE -- an industry benchmark of average
government money market funds with similar investment objectives and policies,
as measured by Lipper Analytical Services, Inc.
 
LIPPER GENERAL EQUITY FUND AVERAGE -- an industry benchmark of average general
equity funds with similar investment objectives and policies, as measured by
Lipper Analytical Services, Inc.
 
                                       18
<PAGE>   65
 
LIPPER FIXED INCOME FUND AVERAGE -- an industry benchmark of average fixed
income funds with similar investment objectives and policies, as measured by
Lipper Analytical Services, Inc.
 
                              FINANCIAL STATEMENTS
 
     The Fund's Financial Statements for the year ended October 31, 1995,
including the financial highlights for each of the five fiscal years in the
period ended October 31, 1995, appearing in the Vanguard Explorer Fund 1995
Annual Report to Shareholders, and the report thereon of Price Waterhouse LLP,
independent accountants, also appearing therein, are incorporated by reference
in this Statement of Additional Information. The Fund's 1995 Annual Report to
Shareholders is enclosed with this Statement of Additional Information.
 
                                       19


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