VANGUARD CONVERTIBLE SECURITIES FUND INC
485BPOS, 2000-02-25
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM N-1A

         REGISTRATION STATEMENT 33-4424 UNDER THE SECURITIES ACT OF 1933

                           PRE-EFFECTIVE AMENDMENT NO.


                         POST-EFFECTIVE AMENDMENT NO. 21


                                       AND

         REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940


                                AMENDMENT NO. 24



                      VANGUARD CONVERTIBLE SECURITIES FUND
         (EXACT NAME OF REGISTRANT AS SPECIFIED IN DECLARATION OF TRUST)

                      P.O. BOX 2600, VALLEY FORGE, PA 19482
                     (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE)

                  REGISTRANT'S TELEPHONE NUMBER (610) 669-1000

                           R. GREGORY BARTON, ESQUIRE
                                  P.O. BOX 876
                             VALLEY FORGE, PA 19482


                IT IS PROPOSED THAT THIS FILING BECOME EFFECTIVE:
            ON MARCH 17, 2000, PURSUANT TO PARAGRAPH (B) OF RULE 485.


                  APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING:
   AS SOON AS PRACTICABLE AFTER THIS REGISTRATION STATEMENT BECOMES EFFECTIVE.



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                                                                 VANGUARD(R)
                                                                 CONVERTIBLE
                                                                 SECURITIES FUND

                                                                 Prospectus
                                                                 March 17, 2000

This prospectus contains
financial data for the
Fund through the
fiscal year ended
November 30, 1999


                                                        [A MEMBER OF
                                                        THE VANGUARD GROUP LOGO]

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VANGUARD CONVERTIBLE SECURITIES FUND
Prospectus

March 17, 2000

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    CONTENTS
- --------------------------------------------------------------------------------
 1  FUND PROFILE                         13  FINANCIAL HIGHLIGHTS
 4  ADDITIONAL INFORMATION               15  INVESTING WITH VANGUARD
 4  A WORD ABOUT RISK                        15  SERVICES AND ACCOUNT FEATURES
 4  WHO SHOULD INVEST                        15  TYPES OF ACCOUNTS
 5  PRIMARY INVESTMENT STRATEGIES            17  BUYING SHARES
 9  THE FUND AND VANGUARD                    19  REDEEMING SHARES
10  INVESTMENT ADVISER                       22  TRANSFERRING REGISTRATION
10  DIVIDENDS, CAPITAL GAINS, AND TAXES      23  FUND AND ACCOUNT UPDATES
12  SHARE PRICE                          GLOSSARY (inside back cover)
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WHY READING THIS PROSPECTUS IS IMPORTANT

This  prospectus  explains the  objective,  risks,  and  strategies  of Vanguard
Convertible Securities Fund. To highlight terms and concepts important to mutual
fund investors,  we have provided "Plain  Talk(R)"  explanations  along the way.
Reading  the  prospectus  will help you to decide  whether the Fund is the right
investment for you. We suggest that you keep it for future reference.
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NEITHER  THE  SECURITIES  AND  EXCHANGE  COMMISSION  NOR  ANY  STATE  SECURITIES
COMMISSION HAS APPROVED OR  DISAPPROVED  OF THESE  SECURITIES OR PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

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1

FUND PROFILE

The following profile summarizes key features of Vanguard Convertible Securities
Fund.

INVESTMENT OBJECTIVE

The Fund seeks to provide current income and long-term growth of capital.

INVESTMENT STRATEGIES

The Fund invests mainly in convertible  securities,  which are hybrid securities
that  combine  the  investment  characteristics  of  bonds  and  common  stocks.
Convertible  securities  include  corporate bonds and preferred  stocks that are
convertible  into  common  stock,  as  well  as debt  securities  with  warrants
attached.  Convertible  securities  tend to have credit  ratings  that are below
investment-grade.

PRIMARY RISKS

THE FUND IS SUBJECT TO SEVERAL RISKS, ANY OF WHICH COULD CAUSE INVESTORS TO LOSE
MONEY. These include:

- -    Interest  rate  risk,  which  is the  chance  that  prices  of  convertible
     securities  will  decline  over  short or even long  periods  due to rising
     interest rates. The market value of a convertible  security is particularly
     sensitive  to changes in  interest  rates when the  convertible  security's
     predetermined conversion price is much higher than the price of the issuing
     company's common stock.

- -    Stock  market  risk,  which  is  the  chance  that  prices  of  convertible
     securities  will  decline  over short or even long periods due to a general
     decline in the stock market. The market value of a convertible  security is
     particularly sensitive to changes in the price of the issuer's common stock
     when the convertible security's predetermined conversion price is about the
     same as the price of the issuing company's common stock.

- -    Credit  risk,  which is the chance that an issuer will fail to pay interest
     or dividends on a convertible  security in a timely manner.  Companies that
     issue  convertible  securities are usually  small-to-medium  size, and they
     often lack top ratings for creditworthiness or credit quality. In addition,
     the credit rating of a company's convertible  securities is generally lower
     than the rating of its  conventional  debt  securities,  since  convertible
     securities  are  normally  considered  "junior"  securities--that  is,  the
     company  usually must pay interest on its  conventional  debt before it can
     make payments on its convertible securities.

- -    Manager risk,  which is the chance that poor security  selection will cause
     the Fund to underperform other funds with similar investment objectives.

PERFORMANCE/RISK INFORMATION

The bar chart and table below  provide an indication of the risk of investing in
the Fund. The bar chart shows the Fund's  performance in each calendar year over
a ten-year  period.  The table shows how the Fund's average annual total returns
for one,  five,  and ten  calendar  years  compare  with those of a  broad-based
securities  market index and a  competitive  funds index.  Keep in mind that the
Fund's past performance does not indicate how it will perform in the future.


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2


             ----------------------------------------------------
                              ANNUAL TOTAL RETURNS
             ----------------------------------------------------
                              1990          -8.18%
                              1991          34.34%
                              1992          19.00%
                              1993          13.54%
                              1994          -5.68%
                              1995          16.74%
                              1996          15.44%
                              1997          16.39%
                              1998           0.56%
                              1999          30.36%
             ----------------------------------------------------

     During the period shown in the bar chart, the highest return for a calendar
quarter was 20.65% (quarter ended December 31, 1999) and the lowest return for a
quarter was -16.01% (quarter ended September 30, 1990).

      --------------------------------------------------------------------
        AVERAGE ANNUAL TOTAL RETURNS FOR YEARS ENDED DECEMBER 31, 1999
      --------------------------------------------------------------------
                                              1 YEAR   5 YEARS   10 YEARS
      --------------------------------------------------------------------
      Vanguard Convertible Securities Fund     30.36%   15.51%    12.45%
      CS First Boston Convertible Securities   42.28    20.08     14.84
       Index
      Average Convertible Securities Fund*     31.14    17.42     12.98
      --------------------------------------------------------------------
      *Derived from data provided by Lipper Inc.
      --------------------------------------------------------------------

FEES AND EXPENSES

The following  table  describes the fees and expenses you may pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended November 30, 1999.

      SHAREHOLDER FEES (fees paid directly from your investment)
      Sales Charge (Load) Imposed on Purchases:                          None
      Sales Charge (Load) Imposed on Reinvested Dividends:               None
      Redemption Fee:                                                    None
      Exchange Fee:                                                      None

      ANNUAL FUND OPERATING EXPENSES (expenses deducted from the Fund's assets)
      Management Expenses:                                              0.50%
      12b-1 Distribution Fee:                                            None
      Other Expenses:                                                   0.05%
       TOTAL ANNUAL FUND OPERATING EXPENSES:                            0.55%


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3

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                                PLAIN TALK ABOUT
                                  FUND EXPENSES

All mutual funds have operating  expenses.  These  expenses,  which are deducted
from a fund's gross  income,  are expressed as a percentage of the net assets of
the fund.  Vanguard  Convertible  Securities Fund's expense ratio in fiscal year
1999 was  0.55%,  or $5.50  per  $1,000  of  average  net  assets.  The  average
convertible  securities mutual fund in 1999 had expenses of 1.53%, or $15.30 per
$1,000 of average net assets  (derived from data provided by Lipper Inc.,  which
reports on the mutual fund industry). Management expenses, which are one part of
operating  expenses,  include investment advisory fees as well as other costs of
managing a Fund--such as account maintenance,  reporting, accounting, legal, and
other administrative expenses.

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     The following example is intended to help you compare the cost of investing
in the Fund with the cost of investing in other mutual funds. It illustrates the
hypothetical  expenses  that you would incur over various  periods if you invest
$10,000 in the Fund.  This example assumes that the Fund provides a return of 5%
a year, and that operating  expenses  remain the same. The results apply whether
or not you redeem your investment at the end of each period.


- -------------------------------------------------
  1 YEAR      3 YEARS    5 YEARS      10 YEARS
- -------------------------------------------------
   $56         $176       $307          $689
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     THIS  EXAMPLE  SHOULD NOT BE  CONSIDERED  TO REPRESENT  ACTUAL  EXPENSES OR
PERFORMANCE  FROM THE PAST OR FOR THE  FUTURE.  ACTUAL  FUTURE  EXPENSES  MAY BE
HIGHER OR LOWER THAN THOSE SHOWN.

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                               PLAIN TALK ABOUT
                            THE COSTS OF INVESTING

Costs are an important  consideration in choosing a mutual fund.  That's because
you, as a shareholder,  pay the costs of operating a fund,  plus any transaction
costs  associated with the fund's buying and selling of securities.  These costs
can erode a substantial  portion of the gross income or capital  appreciation  a
fund achieves. Even seemingly small differences in expenses can, over time, have
a dramatic effect on a fund's performance.
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4

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ADDITIONAL INFORMATION

DIVIDENDS AND CAPITAL GAINS               MINIMUM INITIAL INVESTMENT
Dividends are distributed quarterly in    $3,000; $1,000 for IRAs and custodial
March, June, September, and December;     accounts for minors
capital gains, if any, are distributed
in December                               NEWSPAPER ABBREVIATION
                                          Convrt
INVESTMENT ADVISER
Oaktree Capital Management LLC, Los       VANGUARD FUND NUMBER
Angeles, Calif., since 1996               082

INCEPTION DATE                            CUSIP NUMBER
June 17, 1986                             922023106

NET ASSETS AS OF NOVEMBER 30, 1999        TICKER SYMBOL
$180 million                              VCVSX

SUITABLE FOR IRAS
Yes
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A WORD ABOUT RISK

This  prospectus  describes  risks you would  face as an  investor  in  Vanguard
Convertible  Securities  Fund.  It is  important to keep in mind one of the main
axioms of  investing:  The  higher  the risk of losing  money,  the  higher  the
potential reward. The reverse,  also, is generally true: The lower the risk, the
lower the  potential  reward.  As you consider an  investment  in the Fund,  you
should also take into account your personal tolerance for the daily fluctuations
of the stock and bond markets.

     Look for this [FLAG] symbol  throughout the prospectus.  It is used to mark
detailed  information  about  each  type of risk that you  would  confront  as a
shareholder of the Fund.


WHO SHOULD INVEST

The Fund may be a suitable investment for you if:

- -    You are seeking  higher  current  income than is  normally  available  from
     common stocks and greater potential for long-term growth of capital than is
     normally available from corporate bonds.

- -    You wish to add a convertible  securities  fund to your existing  holdings,
     which could  include  other  stock,  bond,  money  market,  and  tax-exempt
     investments.

- -    You are willing to tolerate  sharp,  sometimes  sudden  fluctuations in the
     value of your investment.  In the past, price  fluctuations for convertible
     securities  have been  wider  than those for bonds but not as wide as those
     for stocks.

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5

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                                PLAIN TALK ABOUT
                             COSTS AND MARKET-TIMING

Some   investors  try  to  profit  from   market-timing--switching   money  into
investments  when they  expect  prices to rise,  and taking  money out when they
expect  the  market  to fall.  As money is  shifted  in and out,  a fund  incurs
expenses  for buying and selling  securities.  These costs are borne by all fund
shareholders,  including the long-term  investors who do not generate the costs.
Therefore,  the Fund  discourages  short-term  trading by,  among other  things,
limiting the number of exchanges it permits.
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     THE VANGUARD FUNDS DO NOT PERMIT MARKET-TIMING.  DO NOT INVEST IN THIS FUND
IF YOU ARE A MARKET-TIMER.

     The Fund has adopted the following  policies,  among others,  to discourage
short-term trading:

- -    The Fund  reserves  the right to  reject  any  purchase  request--including
     exchanges from other  Vanguard  funds--that it regards as disruptive to the
     efficient  management  of the Fund.  A purchase  request  could be rejected
     because  of the  timing  of the  investment  or  because  of a  history  of
     excessive trading by the investor.

- -    There is a limit on the  number of times you can  exchange  into and out of
     the Fund (see "Redeeming Shares" in the INVESTING WITH VANGUARD section).

- -    The Fund reserves the right to stop offering shares at any time.

PRIMARY INVESTMENT STRATEGIES

This section explains the strategies that the investment adviser uses in pursuit
of the Fund's  objective--current income along with long-term growth of capital.
It also explains how the adviser implements these strategies.The Fund's Board of
Trustees  oversees the  management  of the Fund,  and may change the  investment
strategies in the interest of shareholders.

     In addition, this section discusses several important  risks--interest rate
risk,  stock market risk,  credit risk, and manager  risk--faced by investors in
the Fund.

MARKET EXPOSURE

Under normal  circumstances,  the Fund will invest at least 80% of its assets in
convertible  securities.  These securities include corporate bonds and preferred
stocks that are  convertible  into common stock, as well as debt securities with
warrants  (which permit their owners to buy a specific number of stock shares at
a predetermined price) or common stock attached.

     The remaining  20% of the Fund's assets may be invested in  non-convertible
corporate or U.S.  government debt  securities,  common stocks,  or money market
instruments.

[FLAG]  BECAUSE   CONVERTIBLE   SECURITIES  PERFORM  LIKE  BONDS  UNDER  CERTAIN
     CONDITIONS,  THE FUND IS SUBJECT TO INTEREST RATE RISK, WHICH IS THE CHANCE
     THAT THE MARKET VALUE OF THE FUND'S  SHARES WILL DECLINE OVER SHORT OR EVEN
     LONG PERIODS DUE TO RISING INTEREST RATES.

<PAGE>

6

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                                PLAIN TALK ABOUT
                             CONVERTIBLE SECURITIES

Convertible  securities  are  "hybrid"   securities--that  is,  they  have  some
characteristics  of  bonds  and  some of  common  stocks.  Like a bond  (or some
preferred  stocks),  a  convertible  security  typically  pays a  fixed  rate of
interest (or dividends)  and promises to repay  principal at a given date in the
future.  However,  an investor  can  exchange  the  convertible  security  for a
specific  number  of  shares  of  the  issuing  company's  common  stock,  at  a
"conversion  price"  specified at the time the  convertible  security is issued.
Accordingly,  the value of the convertible  security increases (or decreases) as
the price of the underlying  common stock increases (or decreases).  Convertible
securities  typically pay income yields that are higher than the dividend  yield
of the issuer's  common  stock,  but lower than the yield of the  issuer's  debt
securities.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                            BONDS AND INTEREST RATES

As a rule,  when  interest  rates rise,  bond prices fall.  The opposite is also
true:  Bond  prices go up when  interest  rates  fall.  Why do bond  prices  and
interest  rates move in opposite  directions?  Let's assume that you hold a bond
offering a 5% yield. A year later,  interest rates are on the rise and bonds are
offered with a 6% yield. With  higher-yielding  bonds available,  you would have
trouble  selling  your 5% bond for the price you  paid--you  would have to lower
your asking  price.  On the other hand,  if interest  rates were  falling and 4%
bonds were being offered,  you should be able to sell your 5% bond for more than
you paid.
- --------------------------------------------------------------------------------

     When a convertible security's predetermined conversion price is much higher
than the price of the issuing  company's common stock, the convertible  security
takes on the characteristics of a bond. At such times, the price of the security
will move in the opposite direction of interest rates.

     In the past,  bond investors have seen the value of their  investment  rise
and  fall--sometimes  significantly--with  changes in  interest  rates.  Between
December 1976 and September  1981,  for instance,  rising  interest rates caused
long-term bond prices to fall by almost 48%.

     To illustrate the volatility of bond prices,  the following table shows the
effect of both a 1% and a 2%  change  (both up and  down) in  interest  rates on
three bonds of different maturities, each with a face value of $1,000.


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                    HOW INTEREST RATE CHANGES AFFECT THE
                           VALUE OF A $1,000 BOND*
- --------------------------------------------------------------------------------
                           AFTER A 1%   AFTER A 1%   AFTER A 2%    AFTER A 2%
TYPE OF BOND (MATURITY)     INCREASE     DECREASE     INCREASE      DECREASE
- -------------------------------------------------------------------------------
Short-Term (2.5 years)        $978        $1,023        $956        $1,046
Intermediate-Term (10 years)   932         1,074         870         1,156
Long-Term (20 years)           901         1,116         816         1,251
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*Assumes a 7% yield
- -------------------------------------------------------------------------------


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7

     These figures are intended to illustrate interest rate risk; you should not
regard them as an indication  of future  returns from the bond market as a whole
or the Fund in particular.

[FLAG] BECAUSE  PRICES OF THE  FUND'S  CONVERTIBLE  HOLDINGS  MAY  FLUCTUATE  IN
     RESPONSE TO PRICE  CHANGES IN THE  UNDERLYING  COMMON  STOCKS,  THE FUND IS
     SUBJECT TO STOCK MARKET RISK, WHICH IS THE CHANCE THAT STOCK PRICES OVERALL
     WILL DECLINE OVER SHORT OR EVEN LONG PERIODS. STOCK MARKETS TEND TO MOVE IN
     CYCLES, WITH PERIODS OF RISING PRICES AND PERIODS OF FALLING PRICES.

     When a convertible security's  predetermined  conversion price is about the
same as the  price  of the  issuing  company's  common  stock,  the  convertible
security  tends to behave like a common stock.  In such a case,  the  security's
price may exhibit the volatility that is characteristic of common stocks.

     To illustrate the volatility of stock prices, the following table shows the
best,  worst,  and average total returns for the U.S.  stock market over various
periods as measured by the Standard & Poor's 500 Index,  a widely used barometer
of market  activity.  (Total returns  consist of dividend  income plus change in
market  price.)  Note that the returns  shown do not include the costs of buying
and selling  stocks or other  expenses  that a real-world  investment  portfolio
would  incur.  Note,  also,  that the gap between best and worst tends to narrow
over the long term.

- ------------------------------------------------------
       U.S. STOCK MARKET RETURNS (1926-1999)

- ------------------------------------------------------
                 1 YEAR  5 YEARS  10 YEARS   20 YEARS
- ------------------------------------------------------
Best              54.2%   28.6%    19.9%      17.9%
Worst            -43.1   -12.4     -0.9        3.1
Average           13.2    11.0     11.1       11.1
- ------------------------------------------------------

     The table  covers all of the 1-, 5-,  10-,  and 20-year  periods  from 1926
through 1999. You can see, for example,  that while the average return on stocks
for all of the 5-year periods was 11.0%,  returns for individual  5-year periods
ranged  from a -12.4%  average  (from  1928  through  1932) to 28.6%  (from 1995
through 1999).  These average returns reflect past performance on common stocks;
you should not regard them as an  indication  of future  returns from either the
stock market as a whole or this Fund in particular.

SECURITY SELECTION

Oaktree  Capital  Management,  LLC  (Oaktree),  adviser  to the Fund,  generally
selects  convertible  securities that offer attractive yields and were issued by
companies  with  above-average  growth  potential.  In  general,  each  security
selected  for the Fund will,  in  Oaktree's  opinion,  be priced at a reasonable
premium  relative to the price at which it can be converted  into common  stock.
Oaktree  typically  will  sell a  security  when  the  security  approaches  its
conversion  price,  or if a security is no longer as  attractive as an alternate
investment.

[FLAG] THE FUND IS  SUBJECT  TO CREDIT  RISK,  WHICH IS THE  CHANCE  THAT A BOND
     ISSUER WILL FAIL TO PAY INTEREST AND PRINCIPAL IN A TIMELY MANNER.

     Companies that issue  convertible  securities often do not have high credit
ratings. In addition, the credit rating of a company's convertible securities is
typically lower than the rating

<PAGE>

8


of the company's conventional debt securities,  since convertible securities are
normally considered "junior"  securities--that  is, the company usually must pay
interest on its conventional debt before it can make payments on its convertible
securities.

     The Fund invests primarily in convertible  securities that are rated B, Ba,
or Baa by  Moody's  Investors  Service or B, BB, or BBB by  Standard  and Poor's
Corporation.  Reflecting  the universe of  convertible  securities,  most of the
Fund's rated  holdings are below  investment-grade.  The Fund may also invest in
nonrated  securities  that,  in the opinion of the adviser,  are  equivalent  in
quality to rated securities eligible for purchase by the Fund. Therefore, credit
risk is greater for the Fund than for funds that invest in higher-grade bonds.

     The Fund is generally managed without regard to tax ramifications.

[FLAG] THE FUND IS SUBJECT TO MANAGER RISK,  WHICH IS THE  POSSIBILITY  THAT THE
     ADVISER MAY DO A POOR JOB OF SELECTING STOCKS.

TURNOVER RATE

Although  the Fund  generally  seeks to invest  for the long  term,  it may sell
securities  regardless  of how long the  securities  have been held.  The Fund's
average  turnover  rate for the past five years has been about 135%. (A turnover
rate of 100%  occurs,  for example,  when a Fund sells and  replaces  securities
valued at 100% of its net assets within a one-year period.)

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  TURNOVER RATE

Before  investing in a mutual fund,  you should review its turnover  rate.  This
gives an  indication  of how  transaction  costs could affect the fund's  future
returns.  In general,  the greater the volume of buying and selling by the fund,
the greater the impact that brokerage  commissions and other  transaction  costs
will have on its return. Also, funds with high turnover rates may be more likely
to generate  capital gains that must be  distributed to  shareholders  as income
subject to taxes.  As of November 30, 1999,  the average  turnover  rate for all
convertible  securities funds was approximately 113%,  according to Morningstar,
Inc.
- --------------------------------------------------------------------------------

OTHER INVESTMENT POLICIES AND RISKS

Besides  investing in  convertible  securities,  the Fund may make certain other
kinds of investments to achieve its objective.

     The Fund may invest up to 20% of its assets in foreign  securities that are
denominated in U.S.  dollars.  These securities may be traded in U.S. or foreign
markets. To the extent that it owns dollar-denominated  foreign stocks, the Fund
is subject to country risk, which is the possibility that political events (such
as  a  war),   financial  problems  (such  as  government  default  or  currency
devaluation),  or  natural  disasters  (such  as an  earthquake)  will  weaken a
country's  economy and cause  securities  issued by companies in that country to
lose value.

     The Fund may also invest, to a limited extent, in stock futures and options
contracts,  which  are  traditional  types of  derivatives.  Losses  (or  gains)
involving  futures can  sometimes be  substantial--in  part because a relatively
small  price  movement  in a futures  contract  may result in an  immediate  and
substantial  loss (or gain)  for a fund.  This  Fund  will not use  futures  for
speculative  purposes  or as  leveraged  investments  that  magnify the gains or
losses of an  investment.  The Fund's  obligation to purchase  securities  under
futures contracts will not exceed 20% of its total assets.


<PAGE>

9

     The reasons for which the Fund will invest in futures and options are:

- -    To keep cash on hand to meet  shareholder  redemptions or other needs while
     simulating full investment in stocks.

- -    To reduce the Fund's  transaction costs or add value when these instruments
     are favorably priced.

     The Fund may temporarily  depart from its normal  investment  policies--for
instance,   by  investing   substantially  in  cash  reserves--in   response  to
extraordinary market, economic, political, or other conditions. In doing so, the
Fund may succeed in avoiding losses but otherwise fail to achieve its investment
objective.


- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                   DERIVATIVES

A derivative is a financial contract whose value is based on (or "derived" from)
a  traditional  security  (such  as a stock  or a  bond),  an  asset  (such as a
commodity like gold), or a market index (such as the S&P 500 Index). Futures and
options are derivatives  that have been trading on regulated  exchanges for more
than two decades.  These  "traditional"  derivatives are standardized  contracts
that can easily be bought and sold,  and whose market values are  determined and
published  daily. It is these  characteristics  that  differentiate  futures and
options from the relatively new types of derivatives. If used for speculation or
as leveraged investments, derivatives can carry considerable risks.
- --------------------------------------------------------------------------------

THE FUND AND VANGUARD

The Fund is a member of The Vanguard  Group, a family of more than 35 investment
companies  with more than 100 funds holding assets worth more than $530 billion.
All of the  Vanguard  funds  share  in the  expenses  associated  with  business
operations, such as personnel, office space, equipment, and advertising.

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

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                      VANGUARD'S UNIQUE CORPORATE STRUCTURE

The Vanguard Group is truly a MUTUAL mutual fund company. It is owned jointly by
the funds it oversees and thus  indirectly by the  shareholders  in those funds.
Most other mutual funds are operated by for-profit management companies that may
be owned by one person,  by a group of individuals,  or by investors who own the
management  company's stock. By contrast,  Vanguard  provides its services on an
"at-cost"  basis,  and the funds' expense  ratios  reflect only these costs.  No
separate  management  company reaps profits or absorbs losses from operating the
funds.
- --------------------------------------------------------------------------------

<PAGE>

10

INVESTMENT ADVISER

The Fund employs Oaktree Capital  Management,  LLC, 333 South Grand Avenue, 28th
Floor,  Los Angeles,  CA, 90071 as its investment  adviser.  Oaktree manages the
Fund subject to the control of the Trustees and officers of the Fund.

     Oaktree's  advisory  fee is paid  quarterly.  This fee is based on  certain
annual  percentage rates applied to the Fund's average month-end assets for each
quarter.

     For the  fiscal  year  ended  November  30,  1999,  the fee paid to Oaktree
represented  an effective  annual rate of 0.41% of the Fund's average net assets
before a decrease of 0.22% based on performance.

     In addition, Oaktree's advisory fee is increased or decreased, based on the
cumulative  investment  performance  of the Fund as compared  to the  cumulative
total  return of the Credit  Suisse  (CS) First  Boston  Convertible  Securities
Index.  Under this fee arrangement,  Oaktree's fee can be increased or decreased
by as much as 50%.

     The Fund has authorized  Oaktree to choose brokers or dealers to handle the
purchase  and sale of  securities  for the Fund,  and to get the best  available
price and most  favorable  execution  from  these  brokers  with  respect to all
transactions.

     In the interest of obtaining better execution of a transaction, Oaktree may
choose brokers who charge higher commissions. If more than one broker can obtain
the best  available  price and most favorable  execution of a transaction,  then
Oaktree is  authorized  to choose a broker who, in  addition  to  executing  the
transaction,  will provide  research  services to Oaktree or the Fund. Also, the
Fund may direct Oaktree to use a particular  broker for certain  transactions in
exchange for commission rebates or research services provided to the Fund.

     The Board of Trustees may, without prior approval from shareholders, change
the terms of an advisory agreement or hire a new investment  adviser-- either as
a  replacement  for  an  existing  adviser  or as  an  additional  adviser.  Any
significant  change in the Fund's advisory  arrangements will be communicated to
shareholders in writing. In addition, as the Fund's sponsor and overall manager,
The Vanguard Group may provide  investment  advisory services to the Fund, on an
at-cost basis, at any time.


- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                               THE FUND'S ADVISER

Oaktree Capital Management, LLC, is an investment advisory firm founded in 1995.
Oaktree focuses on certain specialized  investment areas,  including convertible
securities.  As of November 30, 1999,  Oaktree  managed more than $15 billion in
assets.

The manager  responsible for overseeing the implementation of Oaktree's strategy
for Vanguard Convertible Securities Fund is:

LARRY W. KEELE,  Principal  and a Founder of Oaktree;  has worked in  investment
management  since 1981;  has managed  portfolio  investments  since 1983;  B.A.,
Tennessee Tech University; M.B.A., University of South Carolina.
- --------------------------------------------------------------------------------


<PAGE>

11



DIVIDENDS, CAPITAL GAINS, AND TAXES

FUND DISTRIBUTIONS

The Fund  distributes to shareholders  virtually all of its net income (interest
and dividends,  less  expenses),  as well as any capital gains realized from the
sale of its holdings. Income dividends generally are distributed in March, June,
September,  and  December;   capital  gains  distributions  generally  occur  in
December.  You can receive distributions of income dividends or capital gains in
cash, or you can have them automatically reinvested in more shares of the Fund.

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  DISTRIBUTIONS

As a  shareholder,  you are  entitled  to your share of the fund's  income  from
interest and dividends, and gains from the sale of investments. You receive such
earnings as either an income  dividend or a capital gains  distribution.  Income
dividends come from both the dividends that the fund earns from its holdings and
the  interest it receives  from its money market and bond  investments.  Capital
gains are realized  whenever the fund sells securities for higher prices than it
paid for them. These capital gains are either short-term or long-term, depending
on whether the fund held the  securities  for one year or less, or more than one
year.
- --------------------------------------------------------------------------------

BASIC TAX POINTS

Vanguard will send you a statement  each year showing the tax status of all your
distributions.  In addition,  taxable investors should be aware of the following
basic tax points:

- -    Distributions are taxable to you for federal income tax purposes whether or
     not you reinvest these amounts in additional Fund shares.

- -    Distributions   declared  in  December--if  paid  to  you  by  the  end  of
     January--are  taxable  for  federal  income tax  purposes as if received in
     December.

- -    Any dividends and short-term  capital gains that you receive are taxable to
     you as ordinary income for federal income tax purposes.

- -    Any  distributions  of net  long-term  capital  gains are taxable to you as
     long-term capital gains for federal income tax purposes, no matter how long
     you've owned shares in the Fund.

- -    Capital gains  distributions  may vary  considerably from year to year as a
     result of the Fund's normal investment activities and cash flows.

- -    A sale or exchange of Fund shares is a taxable  event.  This means that you
     may have a capital gain to report as income, or a capital loss to report as
     a deduction, when you complete your federal income tax return.

- -    Dividend and capital gains  distributions that you receive, as well as your
     gains or losses from any sale or exchange of Fund shares, may be subject to
     state and local income taxes.

GENERAL INFORMATION

BACKUP  WITHHOLDING.   By  law,  Vanguard  must  withhold  31%  of  any  taxable
distributions  or redemptions from your account if you do not:

- -    provide us with your correct taxpayer identification number;

- -    certify that the taxpayer identification number is correct; and

- -    confirm that you are not subject to backup withholding.



<PAGE>

12


Similarly,  Vanguard  must withhold from your account if the IRS instructs us to
do so.

FOREIGN  INVESTORS.  The Vanguard funds  generally do not offer their shares for
sale outside of the United States.  Foreign  investors should be aware that U.S.
withholding  and estate taxes may apply to any  investments  in Vanguard  funds.

INVALID  ADDRESSES.  If a dividend or capital gains distribution check mailed to
your address of record is returned as undeliverable, Vanguard will automatically
reinvest  all future  distributions  until you  provide us with a valid  mailing
address.

TAX CONSEQUENCES.  This prospectus provides general tax information only. If you
are investing through a tax-deferred retirement account, such as an IRA, special
tax rules apply. Please consult your tax adviser for detailed  information about
a fund's tax consequences for you.


- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                               "BUYING A DIVIDEND"

Unless you are investing through a tax-deferred  retirement  account (such as an
IRA),  it is not to your  advantage  to buy shares of a fund  shortly  before it
makes a  distribution,  because  doing so can cost you money in  taxes.  This is
known as "buying a dividend."  For example:  On December 15, you invest  $5,000,
buying 250 shares for $20 each. If the fund pays a distribution  of $1 per share
on December 16, its share price would drop to $19 (not counting  market change).
You still have only $5,000 (250 shares x $19 = $4,750 in share  value,  plus 250
shares x $1 = $250 in  distributions),  but you owe tax on the $250 distribution
you  received--even  if you  reinvest  it in more  shares.  To avoid  "buying  a
dividend," check a fund's distribution schedule before you invest.
- --------------------------------------------------------------------------------

SHARE PRICE

The Fund's share price,  called its net asset value,  or NAV, is calculated each
business day after the close of regular  trading on the New York Stock  Exchange
(the NAV is not  calculated  on  holidays  or other  days when the  Exchange  is
closed).  Net asset  value per share is computed by adding up the total value of
the Fund's  investments  and other assets,  subtracting  any of its  liabilities
(debts), and then dividing by the number of Fund shares outstanding:


                     TOTAL ASSETS - LIABILITIES
NET ASSET VALUE = --------------------------------
                    NUMBER OF SHARES OUTSTANDING

     Knowing the daily net asset value is useful to you as a shareholder because
it indicates the current value of your investment. The Fund's NAV, multiplied by
the  number of  shares  you own,  gives you the  dollar  amount  you would  have
received had you sold all of your shares back to the Fund that day.

     A NOTE ON PRICING:  The Fund's  investments  will be priced at their market
value when market  quotations are readily  available.  When these quotations are
not  readily  available,  investments  will  be  priced  at  their  fair  value,
calculated according to procedures adopted by the Fund's Board of Trustees.

     The Fund's  share price can be found  daily in the mutual fund  listings of
most major newspapers under the heading "Vanguard  Funds." Different  newspapers
use different abbreviations of the Fund's name, but the most common is CONVRT.

<PAGE>

13

FINANCIAL HIGHLIGHTS

The following financial  highlights table is intended to help you understand the
Fund's financial  performance for the past five years,  and certain  information
reflects  financial  results for a single Fund share.  The total  returns in the
table represent the rate that an investor would have earned or lost each year on
an investment  in the Fund  (assuming  reinvestment  of all dividend and capital
gains  distributions).  This  information  has been derived  from the  financial
statements audited by PricewaterhouseCoopers LLP, independent accountants, whose
report--along  with the Fund's financial  statements--is  included in the Fund's
most recent annual report to  shareholders.  You may have the annual report sent
to you without charge by contacting Vanguard.


- --------------------------------------------------------------------------------
                                   VANGUARD CONVERTIBLE SECURITIES FUND
                                          YEAR ENDED NOVEMBER 30,
                        --------------------------------------------------------
                           1999        1998        1997        1996        1995
- --------------------------------------------------------------------------------
NET ASSET VALUE,
 BEGINNING OF YEAR       $11.10      $13.01      $13.07      $12.03      $10.94
- --------------------------------------------------------------------------------
INVESTMENT OPERATIONS
 Net Investment Income      .52         .52         .53         .43         .52
 Net Realized and
  Unrealized Gain (Loss)
  on Investments           2.13        (.77)       1.17        1.29        1.26
                        --------------------------------------------------------
   Total from Investment
    Operations             2.65        (.25)       1.70        1.72        1.78
                        --------------------------------------------------------
DISTRIBUTIONS
 Dividends from Net
  Investment Income        (.57)       (.54)       (.47)       (.54)       (.51)
 Distributions from
  Realized Capital
  Gains                      --       (1.12)      (1.29)       (.14)       (.18)
                        --------------------------------------------------------
   Total Distributions     (.57)      (1.66)      (1.76)       (.68)       (.69)
- --------------------------------------------------------------------------------
NET ASSET VALUE,
 END OF YEAR             $13.18      $11.10      $13.01      $13.07      $12.03
================================================================================

TOTAL RETURN             24.85%      -2.16%      14.81%      14.88%      17.10%
================================================================================

RATIOS/SUPPLEMENTAL DATA
 Net Assets, End of
  Year (Millions)          $180        $172        $189        $170        $172
 Ratio of Total
  Expenses to Average
  Net Assets              0.55%       0.73%       0.67%       0.69%       0.75%
 Ratio of Net
  Investment Income to
  Average Net Assets      4.30%       4.36%       4.29%       3.43%       4.63%
 Turnover Rate             162%        186%        182%         97%         46%
================================================================================


<PAGE>

14

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                   HOW TO READ THE FINANCIAL HIGHLIGHTS TABLE

The Fund began  fiscal 1999 with a net asset value  (price) of $11.10 per share.
During  the  year,  the Fund  earned  $0.52  per share  from  investment  income
(interest  and  dividends)  and  $2.13  per  share  from  investments  that  had
appreciated  in value or that were sold for higher prices than the Fund paid for
them.

Shareholders  received $0.57 per share in the form of dividend and capital gains
distributions.  A portion of each year's  distributions  may come from the prior
year's income or capital gains.

The  earnings  ($2.65  per  share)  minus the  distributions  ($0.57  per share)
resulted in a share price of $13.18 at the end of the year. This was an increase
of $2.08 per share (from  $11.10 at the  beginning  of the year to $13.18 at the
end of the year).  For a shareholder  who  reinvested the  distributions  in the
purchase of more shares, the total return from the Fund was 24.85% for the year.

As of November 30, 1999, the Fund had $180 million in net assets.  For the year,
its  expense  ratio was 0.55%  ($5.50  per  $1,000 of net  assets);  and its net
investment  income  amounted to 4.30% of its  average  net  assets.  It sold and
replaced securities valued at 162% of its net assets.

- --------------------------------------------------------------------------------

"Standard & Poor's(R),"  "S&P(R),"  "S&P  500(R),"  "Standard & Poor's 500," and
"500" are trademarks of The McGraw-Hill Companies, Inc.

<PAGE>

15

- --------------------------------------------------------------------------------
INVESTING WITH VANGUARD

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

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

     The following  sections of the prospectus briefly explain the many services
we offer.  Booklets providing detailed information are available on the services
marked with a [BOOK]. Please call us to request copies.
- --------------------------------------------------------------------------------

SERVICES AND ACCOUNT FEATURES

Vanguard  offers many services that make it convenient to buy, sell, or exchange
shares, or to obtain fund or account information.
- --------------------------------------------------------------------------------
TELEPHONE REDEMPTIONS (SALES AND EXCHANGES)
Automatically set up for this Fund unless you notify us otherwise.
- --------------------------------------------------------------------------------
VANGUARD(R) DIRECT DEPOSIT SERVICE [BOOK]
Automatic  method  for  depositing  your  paycheck  or U.S.  government  payment
(including Social Security and government pension checks) into your account.
- --------------------------------------------------------------------------------
VANGUARD(R) AUTOMATIC EXCHANGE SERVICE [BOOK]
Automatic  method for  moving a fixed  amount of money  from one  Vanguard  fund
account to another.
- --------------------------------------------------------------------------------
VANGUARD FUND EXPRESS(R) [BOOK]
Electronic  method for buying or selling shares.  You can transfer money between
your  Vanguard  fund account and an account at your bank,  savings and loan,  or
credit union on a systematic schedule or whenever you wish.
- --------------------------------------------------------------------------------
VANGUARD DIVIDEND EXPRESS(TM) [BOOK]
Electronic method for transferring  dividend and/or capital gains  distributions
directly  from your  Vanguard  fund account to your bank,  savings and loan,  or
credit union account.
- --------------------------------------------------------------------------------
VANGUARD TELE-ACCOUNT(R) 1-800-662-6273 (ON-BOARD) [BOOK]

Toll-free  24-hour access to Vanguard fund and account  information--as  well as
some  transactions--by  using any touch-tone phone.  Tele-Account provides total
return,  share price, price change, and yield quotations for all Vanguard funds;
gives your account balances and history (e.g., last transaction, latest dividend
distribution);  and  allows  you to sell or  exchange  shares  to and from  most
Vanguard funds.

- --------------------------------------------------------------------------------
ACCESS VANGUARD(TM) www.vanguard.com [COMPUTER]

You can use your  personal  computer to perform  certain  transactions  for most
Vanguard  funds by accessing our website.  To establish  this service,  you must
register  through our website.  We will then mail you an account access password
that  allows  you  to  process  the  following   financial  and   administrative
transactions  online:

- -    Open a new account.*
- -    Buy, sell, or exchange shares of most funds.
- -    Change your name/address.

<PAGE>

16


- -    Add/change fund options (including dividend options, Vanguard Fund Express,
     bank instructions,  checkwriting, and Vanguard Automatic Exchange Service).
     (Some  restrictions may apply.) Please call our Client Services  Department
     for assistance.

*Only current Vanguard shareholders can open a new account online, by exchanging
 shares from other existing Vanguard accounts.
- --------------------------------------------------------------------------------
INVESTOR INFORMATION DEPARTMENT: 1-800-662-7447 (SHIP) TEXT TELEPHONE:
1-800-952-3335
Call  Vanguard for  information  on our funds,  fund  services,  and  retirement
accounts, and to request literature.
- --------------------------------------------------------------------------------

CLIENT SERVICES DEPARTMENT: 1-800-662-2739 (CREW) TEXT TELEPHONE: 1-800-749-7273

Call Vanguard for information on your account, account transactions, and account
statements.
- --------------------------------------------------------------------------------
SERVICES  FOR  CLIENTS  OF  VANGUARD'S  INSTITUTIONAL  DIVISION:  1-888-809-8102
Vanguard's  Institutional  Division offers a variety of specialized services for
large  institutional   investors,   including  the  ability  to  effect  account
transactions through private electronic networks and third-party recordkeepers.
- --------------------------------------------------------------------------------

TYPES OF ACCOUNTS

Individuals and institutions can establish a variety of accounts with Vanguard.
- --------------------------------------------------------------------------------
FOR ONE OR MORE PEOPLE
Open an account in the name of one (individual) or more (joint tenants) people.
- --------------------------------------------------------------------------------
FOR HOLDING PERSONAL TRUST ASSETS [BOOK]
Invest assets held in an existing personal trust.
- --------------------------------------------------------------------------------
FOR INDIVIDUAL RETIREMENT ACCOUNTS [BOOK]
Open a  traditional  IRA account or a Roth IRA  account.  Eligibility  and other
requirements  are  established  by federal law and  Vanguard  custodial  account
agreements. For more information, please call 1-800-662-7447 (SHIP).
- --------------------------------------------------------------------------------
FOR AN ORGANIZATION [BOOK]
Open an account as a corporation,  partnership,  endowment, foundation, or other
entity.
- --------------------------------------------------------------------------------
FOR THIRD-PARTY TRUSTEE RETIREMENT INVESTMENTS
Open an account as a retirement trust or plan based on an existing  corporate or
institutional  plan.  These  accounts  are  established  by the  trustee  of the
existing plan.
- --------------------------------------------------------------------------------
VANGUARD PROTOTYPE PLANS
Open a  variety  of  retirement  accounts  using  Vanguard  prototype  plans for
individuals,  sole proprietorships,  and small businesses. For more information,
please call 1-800-662-2003.
- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
A NOTE ON INVESTING WITH VANGUARD THROUGH OTHER FIRMS
You may purchase or sell Fund shares through a financial  intermediary such as a
bank,  broker,  or investment  adviser.  If you invest with Vanguard  through an
intermediary,  please read that firm's program  materials  carefully to learn of
any  special  rules  that may apply.  For  example,  special  terms may apply to
additional service features, fees, or other policies.  Consult your intermediary
to determine when your order will be priced.
- --------------------------------------------------------------------------------

<PAGE>

17

BUYING SHARES

You buy your shares at the Fund's next-determined net asset value after Vanguard
receives your request.  As long as your request is received  before the close of
trading on the New York Stock Exchange,  generally 4 p.m. Eastern time, you will
buy your shares at that day's net asset value.
- --------------------------------------------------------------------------------
MINIMUM INVESTMENT TO . . .
open a new account
$3,000 (regular account); $1,000 (traditional IRAs and Roth IRAs).

add to an existing account
$100 by mail or exchange; $1,000 by wire.
- --------------------------------------------------------------------------------
A NOTE ON LOW BALANCES

The Fund  reserves  the  right to close any  nonretirement  fund  account  whose
balance falls below the minimum initial  investment.  The Fund will deduct a $10
annual fee in June if your  nonretirement  account balance at that time is below
$2,500.  The low balance fee is waived for investors who have aggregate Vanguard
account assets of $50,000 or more.
- --------------------------------------------------------------------------------
BY MAIL TO . . . [ENVELOPE]
open a new account
Complete and sign the account registration form and enclose your check.

add to an existing account
Mail your check with an  Invest-By-Mail  form  detached  from your  confirmation
statement to the address listed on the form. Please do not alter  Invest-By-Mail
forms, since they are fund- and account-specific.

Make your check payable to: The Vanguard Group-82
All purchases must be made in U.S. dollars, and checks must be drawn on U.S.
banks.

First-class mail to:         Express or Registered mail to:
The Vanguard Group           The Vanguard Group
P.O. Box 1110                455 Devon Park Drive
Valley Forge, PA 19482-1110  Wayne, PA 19087-1815

For clients of Vanguard's Institutional Division . . .

First-class mail to:         Express or Registered mail to:
The Vanguard Group           The Vanguard Group
P.O. Box 2900                455 Devon Park Drive
Valley Forge, PA 19482-2900  Wayne, PA 19087-1815
- --------------------------------------------------------------------------------
IMPORTANT  NOTE:  To prevent  check fraud,  Vanguard will not accept checks made
payable to third parties.
- --------------------------------------------------------------------------------
BY TELEPHONE TO . . . [TELEPHONE]
open a new account

Call Vanguard  Tele-Account*  24 hours a day--or Client Services during business
hours--to exchange from another Vanguard fund account with the same registration
(name, address,  taxpayer  identification  number, and account type). (Note that
some restrictions apply to index fund accounts.)


<PAGE>

18

add to an existing account

Call Vanguard  Tele-Account*  24 hours a day--or Client Services during business
hours--to exchange from another Vanguard fund account with the same registration
(name, address,  taxpayer  identification  number, and account type). (Note that
some restrictions  apply to index fund accounts.) Use Vanguard Fund Express (see
"Services and Account Features") to transfer assets from your bank account. Call
Client Services before your first use to verify that this option is available.

Vanguard Tele-Account        Client Services
1-800-662-6273               1-800-662-2739

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

IMPORTANT  NOTE:  Once  you  have  initiated  a  telephone   transaction  and  a
confirmation  number has been assigned,  the transaction  cannot be revoked.  We
reserve the right to refuse any purchase request.
- --------------------------------------------------------------------------------
BY WIRE TO OPEN A NEW ACCOUNT OR ADD TO AN EXISTING ACCOUNT [WIRE]
Call Client  Services to arrange your wire  transaction.  Wire  transactions  to
retirement  accounts are only  available for asset  transfers and rollovers from
other financial institutions.  Individual IRA contributions will not be accepted
by wire.

Wire to:
FRB ABA 021001088
HSBC Bank USA

For credit to:
Account: 000112046
Vanguard Incoming Wire Account

In favor of:
Vanguard Convertible Securities Fund-82
[Account number, or temporary number for a new account]
[Registered account owner(s)]
[Registered address]

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

- --------------------------------------------------------------------------------
A NOTE ON LARGE PURCHASES

It is important that you call Vanguard  before you invest a large dollar amount.
It is our responsibility to consider the interests of all Fund shareholders, and
so we  reserve  the right to refuse any  purchase  that may  disrupt  the Fund's
operation or performance.

- --------------------------------------------------------------------------------

<PAGE>

19

REDEEMING SHARES

This section describes how you can redeem--that is, sell or exchange--the Fund's
shares.

When Selling Shares:
- -    Vanguard sends the redemption proceeds to you or a designated third party.*
- -    You can sell all or part of your Fund shares at any time.

*May require a signature guarantee; see footnote on page 21.

When Exchanging Shares:
- -    The redemption proceeds are used to purchase shares of a different Vanguard
     fund.
- -    You must meet the receiving fund's minimum investment requirements.
- -    Vanguard reserves the right to revise or terminate the exchange  privilege,
     limit the amount of an exchange, or reject an exchange at any time, without
     notice.

- -    In  order  to  exchange  into  an  account  with a  different  registration
     (including a different name, address, or taxpayer  identification  number),
     you must include the guaranteed signatures of all current account owners on
     your written instructions.

In both  cases,  your  transaction  will be based on the Fund's  next-determined
share price, subject to any special rules discussed in this prospectus.
- --------------------------------------------------------------------------------
NOTE:  Once a redemption  is initiated  and a  confirmation  number  given,  the
transaction CANNOT be canceled.

- --------------------------------------------------------------------------------

HOW TO REQUEST A REDEMPTION

You can request a  redemption  from your Fund  account in any one of three ways:
online, by telephone, or by mail.
     The Vanguard funds whose shares you cannot  exchange online or by telephone
are VANGUARD U.S.  STOCK INDEX FUNDS,  VANGUARD  BALANCED  INDEX FUND,  VANGUARD
INTERNATIONAL  STOCK INDEX FUNDS,  VANGUARD REIT INDEX FUND, and VANGUARD GROWTH
AND INCOME FUND. These funds do, however,  permit online and telephone exchanges
within  IRAs and other  retirement  accounts.  If you sell shares of these funds
online, you will receive a redemption check at your address of record.

- --------------------------------------------------------------------------------
ONLINE REQUESTS [COMPUTER]
ACCESS VANGUARD at www.vanguard.com

You can use your personal  computer to sell or exchange  shares of most Vanguard
funds by accessing our website.  To establish  this  service,  you must register
through our website.  We will then mail you an account access password that will
enable  you to sell  or  exchange  shares  online  (as  well  as  perform  other
transactions).

- --------------------------------------------------------------------------------
TELEPHONE REQUESTS [TELEPHONE]
All Account Types Except Retirement:
Call Vanguard  Tele-Account  24 hours a day--or Client  Services during business
hours--to  sell or exchange  shares.  You can exchange  shares from this Fund to
open an account in another Vanguard fund or to add to an existing  Vanguard fund
account with an identical registration.

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

<PAGE>

20

Vanguard Tele-Account        Client Services
1-800-662-6273               1-800-662-2739
- --------------------------------------------------------------------------------
SPECIAL  INFORMATION:  We will automatically  establish the telephone redemption
option for your  account,  unless you instruct us  otherwise  in writing.  While
telephone  redemption is easy and convenient,  this account  feature  involves a
risk of loss from  unauthorized or fraudulent  transactions.  Vanguard will take
reasonable  precautions  to protect your  account from fraud.  You should do the
same by keeping your account information  private and immediately  reviewing any
account  statements  that  we  send  to  you.  Make  sure  to  contact  Vanguard
immediately about any transaction you believe to be unauthorized.
- --------------------------------------------------------------------------------
We reserve the right to refuse a telephone redemption if the caller is unable to
provide:
- -    The ten-digit account number.
- -    The name and address exactly as registered on the account.
- -    The primary Social Security or employer identification number as registered
     on the account.

- -    The  Personal   Identification   Number,   if  applicable   (for  instance,
     Tele-Account).

     Please note that Vanguard will not be  responsible  for any account  losses
due to telephone  fraud, so long as we have taken reasonable steps to verify the
caller's identity.  If you wish to remove the telephone  redemption feature from
your account, please notify us in writing.
- --------------------------------------------------------------------------------
A NOTE ON  UNUSUAL  CIRCUMSTANCES

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

- --------------------------------------------------------------------------------
MAIL REQUESTS [ENVELOPE]
All Account Types Except Retirement:
Send a letter of instruction signed by all registered  account holders.  Include
the fund name and  account  number and (if you are  selling) a dollar  amount or
number  of shares  OR (if you are  exchanging)  the name of the fund you want to
exchange  into and a dollar  amount or number of  shares.  To  exchange  into an
account  with a different  registration  (including a different  name,  address,
taxpayer identification number, or account type), you must provide Vanguard with
written  instructions  that  include the  guaranteed  signatures  of all current
owners of the fund from which you wish to redeem.

Vanguard Retirement Accounts:
For information on how to request distributions from:
- -    Traditional IRAs and Roth IRAs--call Client Services.
- -    SEP-IRAs, SIMPLE IRAs, 403(b)(7) custodial accounts, and Profit-Sharing and
     Money Purchase Pension (Keogh) Plans--call  Individual  Retirement Plans at
     1-800-662-2003.

Depending on your account  registration  type,  additional  documentation may be
required.

First-class mail to:         Express or Registered mail to:
The Vanguard Group           The Vanguard Group
P.O. Box 1110                455 Devon Park Drive
Valley Forge, PA 19482-1110  Wayne, PA 19087-1815


<PAGE>

21

For clients of Vanguard's Institutional Division ...

First-class mail to:         Express or Registered mail to:
The Vanguard Group           The Vanguard Group
P.O. Box 2900                455 Devon Park Drive
Valley Forge, PA 19482-2900  Wayne, PA 19087-1815
- --------------------------------------------------------------------------------
A NOTE ON LARGE REDEMPTIONS

It is important that you call Vanguard  before you redeem a large dollar amount.
It is our  responsibility to consider the interests of all fund shareholders and
so we reserve the right to delay  delivery of your  redemption  proceeds--up  to
seven days--if the amount may disrupt the Fund's operation or performance.
     If you redeem more than  $250,000  worth of Fund  shares  within any 90-day
period,  the  Fund  reserves  the  right  to pay  part or all of the  redemption
proceeds above $250,000  in-kind,  i.e., in securities,  rather than in cash. If
payment is made in-kind,  you may incur  brokerage  commissions  if you elect to
sell the securities for cash.

- --------------------------------------------------------------------------------

OPTIONS FOR REDEMPTION PROCEEDS

You may receive your redemption  proceeds in one of three ways: check,  exchange
to another Vanguard fund, or Fund Express Redemption.

- --------------------------------------------------------------------------------
CHECK REDEMPTIONS
Normally,  Vanguard  will  mail  your  check  within  two  business  days  of  a
redemption.
- --------------------------------------------------------------------------------
EXCHANGE REDEMPTIONS
As described  above, an exchange  involves using the proceeds of your redemption
to purchase shares of another Vanguard fund.
- --------------------------------------------------------------------------------

FUND EXPRESS REDEMPTIONS
Vanguard  will  electronically  transfer  funds to your  pre-linked  checking or
savings account.

- --------------------------------------------------------------------------------

FOR OUR MUTUAL PROTECTION
For your best interests and ours, Vanguard applies these additional requirements
to redemptions:

REQUEST IN "GOOD ORDER"
All redemption requests must be received by Vanguard in "good order." This means
that your request must include:
- -    The Fund name and account number.
- -    The amount of the transaction (in dollars or shares).
- -    Signatures  of all owners  exactly as  registered  on the account (for mail
     requests).
- -    Signature guarantees (if required).*
- -    Any supporting legal documentation that may be required.
- -    Any outstanding certificates representing shares to be redeemed.

*For instance,  a signature guarantee must be provided by all registered account
 shareholders  when redemption  proceeds are to be sent to a different person or
 address. A signature guarantee can be obtained from most commercial and savings
 banks,  credit  unions,  trust  companies,  or  members  firms of a U.S.  stock
 exchange.

TRANSACTIONS ARE PROCESSED AT THE NEXT-DETERMINED SHARE PRICE AFTER VANGUARD HAS
RECEIVED ALL REQUIRED INFORMATION.

<PAGE>

22

- --------------------------------------------------------------------------------
LIMITS ON ACCOUNT ACTIVITY
Because  excessive account  transactions can disrupt  management of the Fund and
increase the Fund's costs for all shareholders, Vanguard limits account activity
as follows:
- -    You may make no more than TWO  SUBSTANTIVE  "ROUND TRIPS"  THROUGH THE FUND
     during any 12-month period.
- -    Your round trips through the Fund must be at least 30 days apart.
- -    The Fund may refuse a share purchase at any time, for any reason.
- -    Vanguard may revoke an investor's telephone exchange privilege at any time,
     for any reason.

A "round trip" is a redemption  from the Fund  followed by a purchase  back into
the  Fund.  Also,  a  "round  trip"  covers  transactions  accomplished  by  any
combination  of methods,  including  transactions  conducted by check,  wire, or
exchange to/from another Vanguard fund. "Substantive" means a dollar amount that
Vanguard  determines,  in  its  sole  discretion,  could  adversely  affect  the
management of the Fund.
- --------------------------------------------------------------------------------
RETURN YOUR SHARE CERTIFICATES
Any portion of your account represented by share certificates cannot be redeemed
until you return the  certificates  to Vanguard.  Certificates  must be returned
(unsigned),  along with a letter  requesting  the sale or  exchange  you wish to
process, via certified mail to:

The Vanguard Group
455 Devon Park Drive
Wayne, PA 19087-1815
- --------------------------------------------------------------------------------

ALL TRADES ARE FINAL
Vanguard  will not cancel any  transaction  request  (including  any purchase or
redemption)  that we believe to be authentic once the request has been initiated
and a confirmation number assigned.
- --------------------------------------------------------------------------------
UNCASHED CHECKS
Please cash your distribution or redemption  checks promptly.  Vanguard will not
pay interest on uncashed checks.
- --------------------------------------------------------------------------------


TRANSFERRING REGISTRATION

You can  transfer  the  registration  of your Fund  shares to  another  owner by
completing a transfer form and sending it to Vanguard.

First-class mail to:         Express or Registered mail to:
The Vanguard Group           The Vanguard Group
P.O. Box 1110                455 Devon Park Drive
Valley Forge, PA 19482-1110  Wayne, PA 19087-1815

For clients of Vanguard's Institutional Division . . .

First-class mail to:         Express or Registered mail to:
The Vanguard Group           The Vanguard Group
P.O. Box 2900                455 Devon Park Drive
Valley Forge, PA 19482-2900  Wayne, PA 19087-1815

<PAGE>

23

FUND AND ACCOUNT UPDATES

STATEMENTS AND REPORTS
We will send you account and tax  statements to help you keep track of your Fund
account  throughout  the year as well as when you are preparing  your income tax
returns.

     In addition,  you will  receive  financial  reports  about the Fund twice a
year.  These   comprehensive   reports  include  an  assessment  of  the  Fund's
performance  (and a comparison  to its industry  benchmark),  an overview of the
financial  markets,  a  report  from  the  advisers,  and the  Fund's  financial
statements which include a listing of the Fund's holdings.
     To keep  the  Fund's  costs  as low as  possible  (so  that  you and  other
shareholders can keep more of the Fund's investment earnings), Vanguard attempts
to  eliminate  duplicate  mailings  to the same  address.  When two or more Fund
shareholders  have the same last name and address,  we send just one Fund report
to that address--instead of mailing separate reports to each shareholder. If you
want us to send  separate  reports,  notify our Client  Services  Department  at
1-800-662-2739.

- --------------------------------------------------------------------------------
CONFIRMATION STATEMENT
Sent each time you buy,  sell, or exchange  shares;  confirms the trade date and
the amount of your transaction.
- --------------------------------------------------------------------------------
PORTFOLIO SUMMARY [BOOK]
Mailed  quarterly for most  accounts;  shows the market value of your account at
the close of the statement period, as well as distributions,  purchases,  sales,
and exchanges for the current calendar year.
- --------------------------------------------------------------------------------
FUND FINANCIAL REPORTS
Mailed in January and July for this Fund.
- --------------------------------------------------------------------------------
TAX STATEMENTS
Generally  mailed in January;  report previous year's dividend and capital gains
distributions,  proceeds from the sale of shares, and distributions from IRAs or
other retirement accounts.
- --------------------------------------------------------------------------------
AVERAGE COST REVIEW STATEMENT [BOOK]

Issued quarterly for most taxable accounts (accompanies your Portfolio Summary);
shows the average  cost of shares that you redeemed  during the  calendar  year,
using only the average cost single category method.

- --------------------------------------------------------------------------------

<PAGE>

                     (THIS PAGE INTENTIONALLY LEFT BLANK.)

<PAGE>

GLOSSARY OF INVESTMENT TERMS

BOND
A debt security (IOU) issued by a corporation,  government, or government agency
in exchange for the money you lend it. In most  instances,  the issuer agrees to
pay back the loan by a specific date and make regular  interest  payments  until
that date.

CAPITAL GAINS DISTRIBUTION
Payment to mutual fund  shareholders  of gains  realized on securities  that the
fund has sold at a profit, minus any realized losses.

CASH RESERVES
Cash deposits,  short-term  bank deposits,  and money market  instruments  which
include U.S.  Treasury bills,  bank  certificates  of deposit (CDs),  repurchase
agreements, commercial paper, and banker's acceptances.

COMMON STOCK
A security  representing  ownership  rights in a  corporation.  A stockholder is
entitled  to share in the  company's  profits,  some of which may be paid out as
dividends.

CONVERTIBLE SECURITIES
Hybrid  securities,  combining the investment  characteristics of both bonds and
common stocks.  Like a bond (or preferred stock), a convertible  security pays a
fixed  income rate  (dividend),  but may be  converted  into  common  stock at a
specific price or conversion rate.

CREDIT QUALITY
A measure of a bond  issuer's  ability to pay interest and principal in a timely
manner.

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

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

FACE VALUE
The  amount to be paid at  maturity  of a bond;  also  known as the par value or
principal.

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

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

INVESTMENT GRADE
A bond whose credit quality is considered by independent bond-rating agencies to
be sufficient to ensure timely  payment of principal and interest  under current
economic circumstances.

MATURITY
The date when a bond issuer agrees to repay the bond's principal, or face value,
to the bond's buyer.

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

PRINCIPAL
The amount of money you put into an investment.

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

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

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

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

<PAGE>

                                                    [THE VANGUARD GROUP(R) LOGO]

                                                    Post Office Box 2600
                                                    Valley Forge, PA 19482-2600

FOR MORE INFORMATION
If you'd like more information about
Vanguard Convertible Securities
Fund, the following documents are
available free upon request:

ANNUAL/SEMIANNUAL REPORTS
TO SHAREHOLDERS
Additional information about the
Fund's investments is available in
the Fund's annual and semiannual
reports to shareholders.

STATEMENT OF ADDITIONAL
INFORMATION (SAI)
The SAI provides more detailed
information about the Fund.

The current annual and semiannual
reports and the SAI are
incorporated by reference into
(and are thus legally a part of)
this prospectus.

To receive a free copy of the latest
annual or semiannual report or the
SAI, or to request additional
information about the Fund or other
Vanguard funds, please contact us
as follows:

THE VANGUARD GROUP
INVESTOR INFORMATION
DEPARTMENT
P.O. BOX 2600
VALLEY FORGE, PA
19482-2600

TELEPHONE:
1-800-662-7447 (SHIP)

TEXT TELEPHONE:
1-800-952-3335

WORLD WIDE WEB:
WWW.VANGUARD.COM

If you are a current Fund shareholder
and would like information about
your account, account transactions,
and/or account statements,
please call:

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

TEXT TELEPHONE:
1-800-749-7273

INFORMATION PROVIDED BY THE
SECURITIES AND EXCHANGE
COMMISSION (SEC)
You can review and copy
information about the Fund
(including the SAI) at the SEC's
Public Reference Room in
Washington, DC. To find out more
about this public service, call the
SEC at 1-800-SEC-0330. Reports and
other information about the Fund are
also available on the SEC's website
(www.sec.gov), or you can receive
copies of this information, for a fee,
by writing the Public Reference
Section, Securities and Exchange
Commission, Washington, DC
20549-0102.

Fund's Investment Company Act
file number: 811-4627

(C) 2000 The Vanguard Group, Inc.
All rights reserved.
Vanguard Marketing Corporation,
Distributor.

P082N-03/17/2000


<PAGE>


                                                          VANGUARD(R)
                                                          CONVERTIBLE
                                                          SECURITIES FUND

                                                          Participant Prospectus
                                                          March 17, 2000

This prospectus contains
financial data for the
Fund through the
fiscal year ended
November 30, 1999


                                                        [A MEMBER OF
                                                        THE VANGUARD GROUP LOGO]

<PAGE>

VANGUARD CONVERTIBLE SECURITIES FUND
Participant Prospectus

March 17, 2000

- --------------------------------------------------------------------------------
    CONTENTS
- --------------------------------------------------------------------------------
  1 FUND PROFILE                          10 DIVIDENDS, CAPITAL GAINS, AND TAXES

  4 ADDITIONAL INFORMATION                11 SHARE PRICE

  4 A WORD ABOUT RISK                     12 FINANCIAL HIGHLIGHTS

  4 WHO SHOULD INVEST                     14 INVESTING WITH VANGUARD

  5 PRIMARY INVESTMENT STRATEGIES         15 ACCESSING FUND INFORMATION BY
                                             COMPUTER
  9 THE FUND AND VANGUARD
                                          GLOSSARY (inside back cover)
 10 INVESTMENT ADVISER
- --------------------------------------------------------------------------------


- --------------------------------------------------------------------------------
WHY READING THIS PROSPECTUS IS IMPORTANT

This  prospectus  explains the  objective,  risks,  and  strategies  of Vanguard
Convertible Securities Fund. To highlight terms and concepts important to mutual
fund investors,  we have provided "Plain  Talk(R)"  explanations  along the way.
Reading  the  prospectus  will help you to decide  whether the Fund is the right
investment for you. We suggest that you keep it for future reference.
- -------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
IMPORTANT NOTE

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


NEITHER  THE  SECURITIES  AND  EXCHANGE  COMMISSION  NOR  ANY  STATE  SECURITIES
COMMISSION HAS APPROVED OR  DISAPPROVED  OF THESE  SECURITIES OR PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

<PAGE>

FUND PROFILE

The following profile summarizes key features of Vanguard Convertible Securities
Fund.

INVESTMENT OBJECTIVE

The Fund seeks to provide current income and long-term growth of capital.

INVESTMENT STRATEGIES

The Fund invests mainly in convertible  securities,  which are hybrid securities
that  combine  the  investment  characteristics  of  bonds  and  common  stocks.
Convertible  securities  include  corporate bonds and preferred  stocks that are
convertible  into  common  stock,  as  well  as debt  securities  with  warrants
attached.  Convertible  securities  tend to have credit  ratings  that are below
investment-grade.

PRIMARY RISKS

THE FUND IS SUBJECT TO SEVERAL RISKS, ANY OF WHICH COULD CAUSE INVESTORS TO LOSE
MONEY. These include:

- -    Interest  rate  risk,  which  is the  chance  that  prices  of  convertible
     securities  will  decline  over  short or even long  periods  due to rising
     interest rates. The market value of a convertible  security is particularly
     sensitive  to changes in  interest  rates when the  convertible  security's
     predetermined conversion price is much higher than the price of the issuing
     company's common stock.

- -    Stock  market  risk,  which  is  the  chance  that  prices  of  convertible
     securities  will  decline  over short or even long periods due to a general
     decline in the stock market. The market value of a convertible  security is
     particularly sensitive to changes in the price of the issuer's common stock
     when the convertible security's predetermined conversion price is about the
     same as the price of the issuing company's common stock.

- -    Credit  risk,  which is the chance that an issuer will fail to pay interest
     or dividends on a convertible  security in a timely manner.  Companies that
     issue  convertible  securities are usually  small-to-medium  size, and they
     often lack top ratings for creditworthiness or credit quality. In addition,
     the credit rating of a company's convertible  securities is generally lower
     than the rating of its  conventional  debt  securities,  since  convertible
     securities  are  normally  considered  "junior"  securities--that  is,  the
     company  usually must pay interest on its  conventional  debt before it can
     make payments on its convertible securities.

- -    Manager risk,  which is the chance that poor security  selection will cause
     the Fund to underperform other funds with similar investment objectives.

PERFORMANCE/RISK INFORMATION

The bar chart and table below  provide an indication of the risk of investing in
the Fund. The bar chart shows the Fund's  performance in each calendar year over
a ten-year  period.  The table shows how the Fund's average annual total returns
for one,  five,  and ten  calendar  years  compare  with those of a  broad-based
securities  market index and a  competitive  funds index.  Keep in mind that the
Fund's past performance does not indicate how it will perform in the future.


<PAGE>

2


             ----------------------------------------------------
                              ANNUAL TOTAL RETURNS
             ----------------------------------------------------
                              1990          -8.18%
                              1991          34.34%
                              1992          19.00%
                              1993          13.54%
                              1994          -5.68%
                              1995          16.74%
                              1996          15.44%
                              1997          16.39%
                              1998           0.56%
                              1999          30.36%
             ----------------------------------------------------

     During the period shown in the bar chart, the highest return for a calendar
quarter was 20.65% (quarter ended December 31, 1999) and the lowest return for a
quarter was -16.01% (quarter ended September 30, 1990).

      --------------------------------------------------------------------
        AVERAGE ANNUAL TOTAL RETURNS FOR YEARS ENDED DECEMBER 31, 1999
      --------------------------------------------------------------------
                                              1 YEAR   5 YEARS   10 YEARS
      --------------------------------------------------------------------
      Vanguard Convertible Securities Fund     30.36%   15.51%    12.45%
      CS First Boston Convertible Securities   42.28    20.08     14.84
       Index
      Average Convertible Securities Fund*     31.14    17.42     12.98
      --------------------------------------------------------------------
      *Derived from data provided by Lipper Inc.
      --------------------------------------------------------------------

FEES AND EXPENSES

The following  table  describes the fees and expenses you may pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended November 30, 1999.

      SHAREHOLDER FEES (fees paid directly from your investment)
      Sales Charge (Load) Imposed on Purchases:                          None
      Sales Charge (Load) Imposed on Reinvested Dividends:               None
      Redemption Fee:                                                    None
      Exchange Fee:                                                      None

      ANNUAL FUND OPERATING EXPENSES (expenses deducted from the Fund's assets)
      Management Expenses:                                              0.50%
      12b-1 Distribution Fee:                                            None
      Other Expenses:                                                   0.05%
       TOTAL ANNUAL FUND OPERATING EXPENSES:                            0.55%


<PAGE>

3

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  FUND EXPENSES

All mutual funds have operating  expenses.  These  expenses,  which are deducted
from a fund's gross  income,  are expressed as a percentage of the net assets of
the fund.  Vanguard  Convertible  Securities Fund's expense ratio in fiscal year
1999 was  0.55%,  or $5.50  per  $1,000  of  average  net  assets.  The  average
convertible  securities mutual fund in 1999 had expenses of 1.53%, or $15.30 per
$1,000 of average net assets  (derived from data provided by Lipper Inc.,  which
reports on the mutual fund industry). Management expenses, which are one part of
operating  expenses,  include investment advisory fees as well as other costs of
managing a Fund--such as account maintenance,  reporting, accounting, legal, and
other administrative expenses.

- --------------------------------------------------------------------------------

     The following example is intended to help you compare the cost of investing
in the Fund with the cost of investing in other mutual funds. It illustrates the
hypothetical  expenses  that you would incur over various  periods if you invest
$10,000 in the Fund.  This example assumes that the Fund provides a return of 5%
a year, and that operating  expenses  remain the same. The results apply whether
or not you redeem your investment at the end of each period.


- -------------------------------------------------
  1 YEAR      3 YEARS    5 YEARS      10 YEARS
- -------------------------------------------------
   $56         $176       $307          $689
- -------------------------------------------------


     THIS  EXAMPLE  SHOULD NOT BE  CONSIDERED  TO REPRESENT  ACTUAL  EXPENSES OR
PERFORMANCE  FROM THE PAST OR FOR THE  FUTURE.  ACTUAL  FUTURE  EXPENSES  MAY BE
HIGHER OR LOWER THAN THOSE SHOWN.

- --------------------------------------------------------------------------------
                               PLAIN TALK ABOUT
                            THE COSTS OF INVESTING

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

<PAGE>

4

- --------------------------------------------------------------------------------
ADDITIONAL INFORMATION

DIVIDENDS AND CAPITAL GAINS                        NEWSPAPER ABBREVIATION
Dividends are distributed quarterly in March,      Convrt
June, September, and December; capital gains,
if any, are distributed in December                VANGUARD FUND NUMBER
                                                   082
INVESTMENT ADVISER
Oaktree Capital Management LLC, Los Angeles,       CUSIP NUMBER
Calif., since 1996                                 922023106

INCEPTION DATE                                     TICKER SYMBOL
June 17, 1986                                      VCVSX

NET ASSETS AS OF NOVEMBER 30, 1999
$180 million

- --------------------------------------------------------------------------------

A WORD ABOUT RISK

This  prospectus  describes  risks you would  face as an  investor  in  Vanguard
Convertible  Securities  Fund.  It is  important to keep in mind one of the main
axioms of  investing:  The  higher  the risk of losing  money,  the  higher  the
potential reward. The reverse,  also, is generally true: The lower the risk, the
lower the  potential  reward.  As you consider an  investment  in the Fund,  you
should also take into account your personal tolerance for the daily fluctuations
of the stock and bond markets.

     Look for this [FLAG] symbol  throughout the prospectus.  It is used to mark
detailed  information  about  each  type of risk that you  would  confront  as a
shareholder of the Fund.


WHO SHOULD INVEST

The Fund may be a suitable investment for you if:

- -    You are seeking  higher  current  income than is  normally  available  from
     common stocks and greater potential for long-term growth of capital than is
     normally available from corporate bonds.

- -    You wish to add a convertible  securities  fund to your existing  holdings,
     which could  include  other  stock,  bond,  money  market,  and  tax-exempt
     investments.

- -    You are willing to tolerate  sharp,  sometimes  sudden  fluctuations in the
     value of your investment.  In the past, price  fluctuations for convertible
     securities  have been  wider  than those for bonds but not as wide as those
     for stocks.

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                             COSTS AND MARKET-TIMING

Some   investors  try  to  profit  from   market-timing--switching   money  into
investments  when they  expect  prices to rise,  and taking  money out when they
expect  the  market  to fall.  As money is  shifted  in and out,  a fund  incurs
expenses  for buying and selling  securities.  These costs are borne by all fund
shareholders,  including the long-term  investors who do not generate the costs.
Therefore,  the Fund  discourages  short-term  trading by,  among other  things,
limiting the number of exchanges it permits.
- --------------------------------------------------------------------------------

<PAGE>

5

     THE VANGUARD FUNDS DO NOT PERMIT MARKET-TIMING.  DO NOT INVEST IN THIS FUND
IF YOU ARE A MARKET-TIMER.

     The Fund has adopted the following  policies,  among others,  to discourage
short-term trading:

- -    The Fund  reserves  the right to  reject  any  purchase  request--including
     exchanges from other  Vanguard  funds--that it regards as disruptive to the
     efficient  management  of the Fund.  A purchase  request  could be rejected
     because  of the  timing  of the  investment  or  because  of a  history  of
     excessive trading by the investor.

- -    There is a limit on the  number of times you can  exchange  into and out of
     the Fund (see "Redeeming Shares" in the INVESTING WITH VANGUARD section).

- -    The Fund reserves the right to stop offering shares at any time.

PRIMARY INVESTMENT STRATEGIES

This section explains the strategies that the investment adviser uses in pursuit
of the Fund's  objective--current income along with long-term growth of capital.
It also explains how the adviser implements these strategies.The Fund's Board of
Trustees  oversees the  management  of the Fund,  and may change the  investment
strategies in the interest of shareholders.

     In addition, this section discusses several important  risks--interest rate
risk,  stock market risk,  credit risk, and manager  risk--faced by investors in
the Fund.

MARKET EXPOSURE

Under normal  circumstances,  the Fund will invest at least 80% of its assets in
convertible  securities.  These securities include corporate bonds and preferred
stocks that are  convertible  into common stock, as well as debt securities with
warrants  (which permit their owners to buy a specific number of stock shares at
a predetermined price) or common stock attached.

     The remaining  20% of the Fund's assets may be invested in  non-convertible
corporate or U.S.  government debt  securities,  common stocks,  or money market
instruments.

[FLAG]  BECAUSE   CONVERTIBLE   SECURITIES  PERFORM  LIKE  BONDS  UNDER  CERTAIN
     CONDITIONS,  THE FUND IS SUBJECT TO INTEREST RATE RISK, WHICH IS THE CHANCE
     THAT THE MARKET VALUE OF THE FUND'S  SHARES WILL DECLINE OVER SHORT OR EVEN
     LONG PERIODS DUE TO RISING INTEREST RATES.

<PAGE>

6

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                             CONVERTIBLE SECURITIES

Convertible  securities  are  "hybrid"   securities--that  is,  they  have  some
characteristics  of  bonds  and  some of  common  stocks.  Like a bond  (or some
preferred  stocks),  a  convertible  security  typically  pays a  fixed  rate of
interest (or dividends)  and promises to repay  principal at a given date in the
future.  However,  an investor  can  exchange  the  convertible  security  for a
specific  number  of  shares  of  the  issuing  company's  common  stock,  at  a
"conversion  price"  specified at the time the  convertible  security is issued.
Accordingly,  the value of the convertible  security increases (or decreases) as
the price of the underlying  common stock increases (or decreases).  Convertible
securities  typically pay income yields that are higher than the dividend  yield
of the issuer's  common  stock,  but lower than the yield of the  issuer's  debt
securities.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                            BONDS AND INTEREST RATES

As a rule,  when  interest  rates rise,  bond prices fall.  The opposite is also
true:  Bond  prices go up when  interest  rates  fall.  Why do bond  prices  and
interest  rates move in opposite  directions?  Let's assume that you hold a bond
offering a 5% yield. A year later,  interest rates are on the rise and bonds are
offered with a 6% yield. With  higher-yielding  bonds available,  you would have
trouble  selling  your 5% bond for the price you  paid--you  would have to lower
your asking  price.  On the other hand,  if interest  rates were  falling and 4%
bonds were being offered,  you should be able to sell your 5% bond for more than
you paid.
- --------------------------------------------------------------------------------

     When a convertible security's predetermined conversion price is much higher
than the price of the issuing  company's common stock, the convertible  security
takes on the characteristics of a bond. At such times, the price of the security
will move in the opposite direction of interest rates.

     In the past,  bond investors have seen the value of their  investment  rise
and  fall--sometimes  significantly--with  changes in  interest  rates.  Between
December 1976 and September  1981,  for instance,  rising  interest rates caused
long-term bond prices to fall by almost 48%.

     To illustrate the volatility of bond prices,  the following table shows the
effect of both a 1% and a 2%  change  (both up and  down) in  interest  rates on
three bonds of different maturities, each with a face value of $1,000.


- --------------------------------------------------------------------------------
                    HOW INTEREST RATE CHANGES AFFECT THE
                           VALUE OF A $1,000 BOND*
- --------------------------------------------------------------------------------
                           AFTER A 1%   AFTER A 1%   AFTER A 2%    AFTER A 2%
TYPE OF BOND (MATURITY)     INCREASE     DECREASE     INCREASE      DECREASE
- -------------------------------------------------------------------------------
Short-Term (2.5 years)        $978        $1,023        $956        $1,046
Intermediate-Term (10 years)   932         1,074         870         1,156
Long-Term (20 years)           901         1,116         816         1,251
- --------------------------------------------------------------------------------
*Assumes a 7% yield
- -------------------------------------------------------------------------------


<PAGE>

7

     These figures are intended to illustrate interest rate risk; you should not
regard them as an indication  of future  returns from the bond market as a whole
or the Fund in particular.

[FLAG] BECAUSE  PRICES OF THE  FUND'S  CONVERTIBLE  HOLDINGS  MAY  FLUCTUATE  IN
     RESPONSE TO PRICE  CHANGES IN THE  UNDERLYING  COMMON  STOCKS,  THE FUND IS
     SUBJECT TO STOCK MARKET RISK, WHICH IS THE CHANCE THAT STOCK PRICES OVERALL
     WILL DECLINE OVER SHORT OR EVEN LONG PERIODS. STOCK MARKETS TEND TO MOVE IN
     CYCLES, WITH PERIODS OF RISING PRICES AND PERIODS OF FALLING PRICES.

     When a convertible security's  predetermined  conversion price is about the
same as the  price  of the  issuing  company's  common  stock,  the  convertible
security  tends to behave like a common stock.  In such a case,  the  security's
price may exhibit the volatility that is characteristic of common stocks.

     To illustrate the volatility of stock prices, the following table shows the
best,  worst,  and average total returns for the U.S.  stock market over various
periods as measured by the Standard & Poor's 500 Index,  a widely used barometer
of market  activity.  (Total returns  consist of dividend  income plus change in
market  price.)  Note that the returns  shown do not include the costs of buying
and selling  stocks or other  expenses  that a real-world  investment  portfolio
would  incur.  Note,  also,  that the gap between best and worst tends to narrow
over the long term.

- ------------------------------------------------------
       U.S. STOCK MARKET RETURNS (1926-1999)

- ------------------------------------------------------
                 1 YEAR  5 YEARS  10 YEARS   20 YEARS
- ------------------------------------------------------
Best              54.2%   28.6%    19.9%      17.9%
Worst            -43.1   -12.4     -0.9        3.1
Average           13.2    11.0     11.1       11.1
- ------------------------------------------------------

     The table  covers all of the 1-, 5-,  10-,  and 20-year  periods  from 1926
through 1999. You can see, for example,  that while the average return on stocks
for all of the 5-year periods was 11.0%,  returns for individual  5-year periods
ranged  from a -12.4%  average  (from  1928  through  1932) to 28.6%  (from 1995
through 1999).  These average returns reflect past performance on common stocks;
you should not regard them as an  indication  of future  returns from either the
stock market as a whole or this Fund in particular.

SECURITY SELECTION

Oaktree  Capital  Management,  LLC  (Oaktree),  adviser  to the Fund,  generally
selects  convertible  securities that offer attractive yields and were issued by
companies  with  above-average  growth  potential.  In  general,  each  security
selected  for the Fund will,  in  Oaktree's  opinion,  be priced at a reasonable
premium  relative to the price at which it can be converted  into common  stock.
Oaktree  typically  will  sell a  security  when  the  security  approaches  its
conversion  price,  or if a security is no longer as  attractive as an alternate
investment.

[FLAG] THE FUND IS  SUBJECT  TO CREDIT  RISK,  WHICH IS THE  CHANCE  THAT A BOND
     ISSUER WILL FAIL TO PAY INTEREST AND PRINCIPAL IN A TIMELY MANNER.

     Companies that issue  convertible  securities often do not have high credit
ratings. In addition, the credit rating of a company's convertible securities is
typically lower than the rating

<PAGE>

8


of the company's conventional debt securities,  since convertible securities are
normally considered "junior"  securities--that  is, the company usually must pay
interest on its conventional debt before it can make payments on its convertible
securities.

     The Fund invests primarily in convertible  securities that are rated B, Ba,
or Baa by  Moody's  Investors  Service or B, BB, or BBB by  Standard  and Poor's
Corporation.  Reflecting  the universe of  convertible  securities,  most of the
Fund's rated  holdings are below  investment-grade.  The Fund may also invest in
nonrated  securities  that,  in the opinion of the adviser,  are  equivalent  in
quality to rated securities eligible for purchase by the Fund. Therefore, credit
risk is greater for the Fund than for funds that invest in higher-grade bonds.

     The Fund is generally managed without regard to tax ramifications.

[FLAG] THE FUND IS SUBJECT TO MANAGER RISK,  WHICH IS THE  POSSIBILITY  THAT THE
     ADVISER MAY DO A POOR JOB OF SELECTING STOCKS.

TURNOVER RATE

Although  the Fund  generally  seeks to invest  for the long  term,  it may sell
securities  regardless  of how long the  securities  have been held.  The Fund's
average  turnover  rate for the past five years has been about 135%. (A turnover
rate of 100%  occurs,  for example,  when a Fund sells and  replaces  securities
valued at 100% of its net assets within a one-year period.)

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  TURNOVER RATE

Before  investing in a mutual fund,  you should review its turnover  rate.  This
gives an  indication  of how  transaction  costs could affect the fund's  future
returns.  In general,  the greater the volume of buying and selling by the fund,
the greater the impact that brokerage  commissions and other  transaction  costs
will have on its return. Also, funds with high turnover rates may be more likely
to generate  capital gains that must be  distributed to  shareholders  as income
subject to taxes.  As of November 30, 1999,  the average  turnover  rate for all
convertible  securities funds was approximately 113%,  according to Morningstar,
Inc.
- --------------------------------------------------------------------------------

OTHER INVESTMENT POLICIES AND RISKS

Besides  investing in  convertible  securities,  the Fund may make certain other
kinds of investments to achieve its objective.

     The Fund may invest up to 20% of its assets in foreign  securities that are
denominated in U.S.  dollars.  These securities may be traded in U.S. or foreign
markets. To the extent that it owns dollar-denominated  foreign stocks, the Fund
is subject to country risk, which is the possibility that political events (such
as  a  war),   financial  problems  (such  as  government  default  or  currency
devaluation),  or  natural  disasters  (such  as an  earthquake)  will  weaken a
country's  economy and cause  securities  issued by companies in that country to
lose value.

     The Fund may also invest, to a limited extent, in stock futures and options
contracts,  which  are  traditional  types of  derivatives.  Losses  (or  gains)
involving  futures can  sometimes be  substantial--in  part because a relatively
small  price  movement  in a futures  contract  may result in an  immediate  and
substantial  loss (or gain)  for a fund.  This  Fund  will not use  futures  for
speculative  purposes  or as  leveraged  investments  that  magnify the gains or
losses of an  investment.  The Fund's  obligation to purchase  securities  under
futures contracts will not exceed 20% of its total assets.


<PAGE>

9

     The reasons for which the Fund will invest in futures and options are:

- -    To keep cash on hand to meet  shareholder  redemptions or other needs while
     simulating full investment in stocks.

- -    To reduce the Fund's  transaction costs or add value when these instruments
     are favorably priced.

     The Fund may temporarily  depart from its normal  investment  policies--for
instance,   by  investing   substantially  in  cash  reserves--in   response  to
extraordinary market, economic, political, or other conditions. In doing so, the
Fund may succeed in avoiding losses but otherwise fail to achieve its investment
objective.


- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                   DERIVATIVES

A derivative is a financial contract whose value is based on (or "derived" from)
a  traditional  security  (such  as a stock  or a  bond),  an  asset  (such as a
commodity like gold), or a market index (such as the S&P 500 Index). Futures and
options are derivatives  that have been trading on regulated  exchanges for more
than two decades.  These  "traditional"  derivatives are standardized  contracts
that can easily be bought and sold,  and whose market values are  determined and
published  daily. It is these  characteristics  that  differentiate  futures and
options from the relatively new types of derivatives. If used for speculation or
as leveraged investments, derivatives can carry considerable risks.
- --------------------------------------------------------------------------------

THE FUND AND VANGUARD

The Fund is a member of The Vanguard  Group, a family of more than 35 investment
companies  with more than 100 funds holding assets worth more than $530 billion.
All of the  Vanguard  funds  share  in the  expenses  associated  with  business
operations, such as personnel, office space, equipment, and advertising.

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

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                      VANGUARD'S UNIQUE CORPORATE STRUCTURE

The Vanguard Group is truly a MUTUAL mutual fund company. It is owned jointly by
the funds it oversees and thus  indirectly by the  shareholders  in those funds.
Most other mutual funds are operated by for-profit management companies that may
be owned by one person,  by a group of individuals,  or by investors who own the
management  company's stock. By contrast,  Vanguard  provides its services on an
"at-cost"  basis,  and the funds' expense  ratios  reflect only these costs.  No
separate  management  company reaps profits or absorbs losses from operating the
funds.
- --------------------------------------------------------------------------------

<PAGE>

10

INVESTMENT ADVISER

The Fund employs Oaktree Capital  Management,  LLC, 333 South Grand Avenue, 28th
Floor,  Los Angeles,  CA, 90071 as its investment  adviser.  Oaktree manages the
Fund subject to the control of the Trustees and officers of the Fund.

     Oaktree's  advisory  fee is paid  quarterly.  This fee is based on  certain
annual  percentage rates applied to the Fund's average month-end assets for each
quarter.

     For the  fiscal  year  ended  November  30,  1999,  the fee paid to Oaktree
represented  an effective  annual rate of 0.41% of the Fund's average net assets
before a decrease of 0.22% based on performance.

     In addition, Oaktree's advisory fee is increased or decreased, based on the
cumulative  investment  performance  of the Fund as compared  to the  cumulative
total  return of the Credit  Suisse  (CS) First  Boston  Convertible  Securities
Index.  Under this fee arrangement,  Oaktree's fee can be increased or decreased
by as much as 50%.

     The Fund has authorized  Oaktree to choose brokers or dealers to handle the
purchase  and sale of  securities  for the Fund,  and to get the best  available
price and most  favorable  execution  from  these  brokers  with  respect to all
transactions.

     In the interest of obtaining better execution of a transaction, Oaktree may
choose brokers who charge higher commissions. If more than one broker can obtain
the best  available  price and most favorable  execution of a transaction,  then
Oaktree is  authorized  to choose a broker who, in  addition  to  executing  the
transaction,  will provide  research  services to Oaktree or the Fund. Also, the
Fund may direct Oaktree to use a particular  broker for certain  transactions in
exchange for commission rebates or research services provided to the Fund.

     The Board of Trustees may, without prior approval from shareholders, change
the terms of an advisory agreement or hire a  new investment  adviser--either as
a  replacement  for  an  existing  adviser  or as  an  additional  adviser.  Any
significant  change in the Fund's advisory  arrangements will be communicated to
shareholders in writing. In addition, as the Fund's sponsor and overall manager,
The Vanguard Group may provide  investment  advisory services to the Fund, on an
at-cost basis, at any time.


- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                               THE FUND'S ADVISER

Oaktree Capital Management, LLC, is an investment advisory firm founded in 1995.
Oaktree focuses on certain specialized  investment areas,  including convertible
securities.  As of November 30, 1999,  Oaktree  managed more than $15 billion in
assets.

The manager  responsible for overseeing the implementation of Oaktree's strategy
for Vanguard Convertible Securities Fund is:

LARRY W. KEELE,  Principal  and a Founder of Oaktree;  has worked in  investment
management  since 1981;  has managed  portfolio  investments  since 1983;  B.A.,
Tennessee Tech University; M.B.A., University of South Carolina.
- --------------------------------------------------------------------------------




DIVIDENDS, CAPITAL GAINS, AND TAXES

The Fund  distributes to shareholders  virtually all of its net income (interest
and dividends,  less  expenses),  as well as any capital gains realized from the
sale of its holdings. Income


<PAGE>

11


dividends  generally are distributed in March,  June,  September,  and December;
capital gains distributions generally occur in December.

     Your  dividend  and  capital  gains  distributions  will be  reinvested  in
additional  Fund  shares  and  accumulate  on a  tax-deferred  basis  if you are
investing through an employer-sponsored retirement or savings plan. You will not
owe taxes on these  distributions until you begin withdrawals from the plan. You
should consult your plan administrator, your plan's Summary Plan Description, or
your tax adviser about the tax consequences of plan withdrawals.


- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  DISTRIBUTIONS

As a  shareholder,  you are  entitled  to your share of the fund's  income  from
interest and dividends, and gains from the sale of investments. You receive such
earnings as either an income  dividend or a capital gains  distribution.  Income
dividends come from both the dividends that the fund earns from its holdings and
the  interest it receives  from its money market and bond  investments.  Capital
gains are realized  whenever the fund sells securities for higher prices than it
paid for them. These capital gains are either short-term or long-term, depending
on whether the fund held the  securities  for one year or less, or more than one
year.
- --------------------------------------------------------------------------------

SHARE PRICE

The Fund's share price,  called its net asset value,  or NAV, is calculated each
business day after the close of regular  trading on the New York Stock  Exchange
(the NAV is not  calculated  on  holidays  or other  days when the  Exchange  is
closed).  Net asset  value per share is computed by adding up the total value of
the Fund's  investments  and other assets,  subtracting  any of its  liabilities
(debts), and then dividing by the number of Fund shares outstanding:


                     TOTAL ASSETS - LIABILITIES
NET ASSET VALUE = --------------------------------
                    NUMBER OF SHARES OUTSTANDING

     Knowing the daily net asset value is useful to you as a shareholder because
it indicates the current value of your investment. The Fund's NAV, multiplied by
the  number of  shares  you own,  gives you the  dollar  amount  you would  have
received had you sold all of your shares back to the Fund that day.

     A NOTE ON PRICING:  The Fund's  investments  will be priced at their market
value when market  quotations are readily  available.  When these quotations are
not  readily  available,  investments  will  be  priced  at  their  fair  value,
calculated according to procedures adopted by the Fund's Board of Trustees.

     The Fund's  share price can be found  daily in the mutual fund  listings of
most major newspapers under the heading "Vanguard  Funds." Different  newspapers
use different abbreviations of the Fund's name, but the most common is CONVRT.

<PAGE>

12

FINANCIAL HIGHLIGHTS

The following financial  highlights table is intended to help you understand the
Fund's financial  performance for the past five years,  and certain  information
reflects  financial  results for a single Fund share.  The total  returns in the
table represent the rate that an investor would have earned or lost each year on
an investment  in the Fund  (assuming  reinvestment  of all dividend and capital
gains  distributions).  This  information  has been derived  from the  financial
statements audited by PricewaterhouseCoopers LLP, independent accountants, whose
report--along  with the Fund's financial  statements--is  included in the Fund's
most recent annual report to  shareholders.  You may have the annual report sent
to you without charge by contacting Vanguard.

- --------------------------------------------------------------------------------
                                   VANGUARD CONVERTIBLE SECURITIES FUND
                                          YEAR ENDED NOVEMBER 30,
                        --------------------------------------------------------
                           1999        1998        1997        1996        1995
- --------------------------------------------------------------------------------
NET ASSET VALUE,
 BEGINNING OF YEAR       $11.10      $13.01      $13.07      $12.03      $10.94
- --------------------------------------------------------------------------------
INVESTMENT OPERATIONS
 Net Investment Income      .52         .52         .53         .43         .52
 Net Realized and
  Unrealized Gain (Loss)
  on Investments           2.13        (.77)       1.17        1.29        1.26
                        --------------------------------------------------------
   Total from Investment
    Operations             2.65        (.25)       1.70        1.72        1.78
                        --------------------------------------------------------
DISTRIBUTIONS
 Dividends from Net
  Investment Income        (.57)       (.54)       (.47)       (.54)       (.51)
 Distributions from
  Realized Capital
  Gains                      --       (1.12)      (1.29)       (.14)       (.18)
                        --------------------------------------------------------
   Total Distributions     (.57)      (1.66)      (1.76)       (.68)       (.69)
- --------------------------------------------------------------------------------
NET ASSET VALUE,
 END OF YEAR             $13.18      $11.10      $13.01      $13.07      $12.03
================================================================================

TOTAL RETURN             24.85%      -2.16%      14.81%      14.88%      17.10%
================================================================================

RATIOS/SUPPLEMENTAL DATA
 Net Assets, End of
  Year (Millions)          $180        $172        $189        $170        $172
 Ratio of Total
  Expenses to Average
  Net Assets              0.55%       0.73%       0.67%       0.69%       0.75%
 Ratio of Net
  Investment Income to
  Average Net Assets      4.30%       4.36%       4.29%       3.43%       4.63%
 Turnover Rate             162%        186%        182%         97%         46%
================================================================================


<PAGE>

13

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                   HOW TO READ THE FINANCIAL HIGHLIGHTS TABLE

The Fund began  fiscal 1999 with a net asset value  (price) of $11.10 per share.
During  the  year,  the Fund  earned  $0.52  per share  from  investment  income
(interest  and  dividends)  and  $2.13  per  share  from  investments  that  had
appreciated  in value or that were sold for higher prices than the Fund paid for
them.

Shareholders  received $0.57 per share in the form of dividend and capital gains
distributions.  A portion of each year's  distributions  may come from the prior
year's income or capital gains.

The  earnings  ($2.65  per  share)  minus the  distributions  ($0.57  per share)
resulted in a share price of $13.18 at the end of the year. This was an increase
of $2.08 per share (from  $11.10 at the  beginning  of the year to $13.18 at the
end of the year).  For a shareholder  who  reinvested the  distributions  in the
purchase of more shares, the total return from the Fund was 24.85% for the year.

As of November 30, 1999, the Fund had $180 million in net assets.  For the year,
its  expense  ratio was 0.55%  ($5.50  per  $1,000 of net  assets);  and its net
investment  income  amounted to 4.30% of its  average  net  assets.  It sold and
replaced securities valued at 162% of its net assets.

- --------------------------------------------------------------------------------

"Standard & Poor's(R),"  "S&P(R),"  "S&P  500(R),"  "Standard & Poor's 500," and
"500" are trademarks of The McGraw-Hill Companies, Inc.

<PAGE>

14

INVESTING WITH VANGUARD

The Fund is an investment  option in your  retirement or savings plan. Your plan
administrator  or your  employee  benefits  office can provide you with detailed
information  on how to  participate in your plan and how to elect the Fund as an
investment  option.

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

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

INVESTMENT OPTIONS AND ALLOCATIONS

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

TRANSACTIONS

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

     In all cases,  your transaction will be based on the Fund's next-determined
net asset value after  Vanguard  receives  your  request (or, in the case of new
contributions,  the  next-determined net asset value after Vanguard receives the
order from your plan administrator).  As long as this request is received before
the close of trading on the New York Stock  Exchange,  generally 4 p.m.  Eastern
time, you will receive that day's net asset value.

EXCHANGES

The exchange  privilege (your ability to redeem shares from one fund to purchase
shares of another  fund) may be available to you through your plan.  Although we
make every  effort to maintain  the exchange  privilege,  Vanguard  reserves the
right to revise or terminate this privilege,  limit the amount of an exchange or
reject any exchange,  at any time, without notice.  Because excessive  exchanges
can potentially  disrupt the management of the Fund and increase its transaction
costs,  Vanguard  limits  participant  exchange  activity  to no more  than FOUR
SUBSTANTIVE  "ROUND TRIPS"  THROUGH THE FUND (at least 90 days apart) during any
12-month  period.  A "round  trip" is a redemption  from the Fund  followed by a
purchase back into the Fund.  "Substantive"  means a dollar amount that Vanguard
determines, in its sole discretion, could adversely affect the management of the
Fund.

     Before  making an exchange to or from another fund  available in your plan,
consider the following:

- -    Certain investment options,  particularly funds made up of company stock or
     investment contracts, may be subject to unique restrictions.

- -    Make sure to read that fund's  prospectus.  Contact  Participant  Services,
     toll-free, at 1-800-523-1188 for a copy.

- -    Vanguard can accept exchanges only as permitted by your plan.  Contact your
     plan  administrator for details on the exchange policies that apply to your
     plan.

<PAGE>

15

ACCESSING FUND INFORMATION BY COMPUTER

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

<PAGE>

                     (THIS PAGE INTENTIONALLY LEFT BLANK.)

<PAGE>

GLOSSARY OF INVESTMENT TERMS

BOND
A debt security (IOU) issued by a corporation,  government, or government agency
in exchange for the money you lend it. In most  instances,  the issuer agrees to
pay back the loan by a specific date and make regular  interest  payments  until
that date.

CAPITAL GAINS DISTRIBUTION
Payment to mutual fund  shareholders  of gains  realized on securities  that the
fund has sold at a profit, minus any realized losses.

CASH RESERVES
Cash deposits,  short-term  bank deposits,  and money market  instruments  which
include U.S.  Treasury bills,  bank  certificates  of deposit (CDs),  repurchase
agreements, commercial paper, and banker's acceptances.

COMMON STOCK
A security  representing  ownership  rights in a  corporation.  A stockholder is
entitled  to share in the  company's  profits,  some of which may be paid out as
dividends.

CONVERTIBLE SECURITIES
Hybrid  securities,  combining the investment  characteristics of both bonds and
common stocks.  Like a bond (or preferred stock), a convertible  security pays a
fixed  income rate  (dividend),  but may be  converted  into  common  stock at a
specific price or conversion rate.

CREDIT QUALITY
A measure of a bond  issuer's  ability to pay interest and principal in a timely
manner.

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

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

FACE VALUE
The  amount to be paid at  maturity  of a bond;  also  known as the par value or
principal.

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

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

INVESTMENT GRADE
A bond whose credit quality is considered by independent bond-rating agencies to
be sufficient to ensure timely  payment of principal and interest  under current
economic circumstances.

MATURITY
The date when a bond issuer agrees to repay the bond's principal, or face value,
to the bond's buyer.

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

PRINCIPAL
The amount of money you put into an investment.

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

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

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

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

<PAGE>

                                                    [THE VANGUARD GROUP(R) LOGO]

                                                    Post Office Box 2600
                                                    Valley Forge, PA 19482-2600

FOR MORE INFORMATION
If you'd like more information about
Vanguard Convertible Securities
Fund, the following documents are
available free upon request:

ANNUAL/SEMIANNUAL REPORTS
TO SHAREHOLDERS
Additional information about the
Fund's investments is available in
the Fund's annual and semiannual
reports to shareholders.

STATEMENT OF ADDITIONAL
INFORMATION (SAI)
The SAI provides more detailed
information about the Fund.

The current annual and semiannual
reports and the SAI are
incorporated by reference into
(and are thus legally a part of)
this prospectus.

To receive a free copy of the latest
annual or semiannual report or the
SAI, or to request additional
information about the Fund or other
Vanguard funds, please contact us
as follows:

THE VANGUARD GROUP
PARTICIPANT SERVICES CENTER
P.O. BOX 2900
VALLEY FORGE, PA 19482-2900

TELEPHONE:
1-800-523-1188

TEXT TELEPHONE:
1-800-523-8004

WORLD WIDE WEB:
WWW.VANGUARD.COM


INFORMATION PROVIDED BY THE
SECURITIES AND EXCHANGE
COMMISSION (SEC)
You can review and copy
information about the Fund
(including the SAI) at the SEC's
Public Reference Room in
Washington, DC. To find out more
about this public service, call the
SEC at 1-800-SEC-0330. Reports and
other information about the Fund are
also available on the SEC's website
(www.sec.gov), or you can receive
copies of this information, for a fee,
by writing the Public Reference
Section, Securities and Exchange
Commission, Washington, DC
20549-0102.

Fund's Investment Company Act
file number: 811-4627

(C) 2000 The Vanguard Group, Inc.
All rights reserved.
Vanguard Marketing Corporation,
Distributor.

I082N-03/17/2000


<PAGE>

                                     PART B

                      VANGUARD CONVERTIBLE SECURITIES FUND
                                   (THE FUND)

                       STATEMENT OF ADDITIONAL INFORMATION

                                 MARCH 17, 2000

This Statement is not a prospectus  but should be read in  conjunction  with the
Fund's current Prospectus (dated March 17, 2000). To obtain, without charge, the
Prospectus or the most recent Annual Report to Shareholders,  which contains the
Fund's financial statements as hereby incorporated by reference, please call:

                         INVESTOR INFORMATION DEPARTMENT
                                 1-800-662-7447

                               TABLE OF CONTENTS

DESCRIPTION OF THE FUND......................................................B-1
FUNDAMENTAL INVESTMENT LIMITATIONS...........................................B-3
PURCHASE OF SHARES...........................................................B-4
REDEMPTION OF SHARES.........................................................B-4
MANAGEMENT OF THE FUND.......................................................B-5
INVESTMENT ADVISORY SERVICES.................................................B-8
PORTFOLIO TRANSACTIONS......................................................B-10
INVESTMENT POLICIES.........................................................B-11
FINANCIAL STATEMENTS........................................................B-16
YIELD AND TOTAL RETURN......................................................B-16
SHARE PRICE.................................................................B-18
COMPARATIVE INDEXES.........................................................B-19
APPENDIX--DESCRIPTION OF SECURITIES AND RATINGS.............................B-22

                            DESCRIPTION OF THE FUND

ORGANIZATION

The Fund was organized as a Maryland corporation in 1986, and was reorganized as
a Delaware  business trust in June 1998. The Fund is registered  with the United
States Securities and Exchange  Commission (the Commission) under the Investment
Company  Act of 1940  (the  1940  Act)  as an  open-end  diversified  management
investment  company.  There  is no limit on the  number  of full and  fractional
shares that the Fund may issue.

SERVICE PROVIDERS

     CUSTODIAN.   First  Union  National  Bank,   PA4943,   530  Walnut  Street,
Philadelphia,  Pennsylvania 19106, serves as the Fund's custodian. The custodian
is  responsible  for  maintaining  the Fund's  assets and keeping all  necessary
accounts and records of Fund assets.

     INDEPENDENT ACCOUNTANTS.  PricewaterhouseCoopers LLP, 30 South 17th Street,
Philadelphia,  Pennsylvania 19103, serves as the Fund's independent accountants.
The  accountants  audit  financial  statements  for the Fund and  provide  other
related services.

     TRANSFER  AND   DIVIDEND-PAYING   AGENT.  The  Fund's  transfer  agent  and
dividend-paying  agent is The Vanguard  Group,  Inc.,  100  Vanguard  Boulevard,
Malvern, Pennsylvania 19355.

                                      B-1

<PAGE>

CHARACTERISTICS OF THE FUND'S SHARES

     RESTRICTIONS  ON HOLDING OR DISPOSING OF SHARES.  There are no restrictions
on the right of  shareholders  to retain or dispose of the Fund's shares,  other
than the possible future  termination of the Fund. The Fund may be terminated by
reorganization  into another mutual fund or by liquidation  and  distribution of
its assets.  Unless terminated by  reorganization or liquidation,  the Fund will
continue indefinitely.

     SHAREHOLDER  LIABILITY.  The Fund is organized  under  Delaware law,  which
provides  that  shareholders  of a  business  trust  are  entitled  to the  same
limitations of personal  liability as  shareholders  of a corporation  organized
under Delaware law. Effectively,  this means that a shareholder of the Fund will
not be personally liable for payment of the Fund's debts except by reason of his
or her own conduct or acts. In addition,  a shareholder  could incur a financial
loss on account of a Fund  obligation  only if the Fund itself had no  remaining
assets with which to meet such  obligation.  We believe that the  possibility of
such a situation arising is extremely remote.

     DIVIDEND  RIGHTS.  The Fund's  shareholders  are  entitled  to receive  any
dividends or other  distributions  declared by the Fund. No shares have priority
or preference  over any other shares with respect to dividends or  distributions
of the Fund.  All dividends and  distributions  will be paid ratably to all Fund
shareholders  according to the number of Fund shares held by shareholders on the
record date.

     VOTING  RIGHTS.  Shareholders  are  entitled  to vote on a matter if: (i) a
shareholder  vote is required  under the 1940 Act;  (ii) the matter  concerns an
amendment to the Declaration of Trust that would adversely  affect to a material
degree the rights and  preferences  of the shares of any class or fund; or (iii)
the Trustees determine that it is necessary or desirable to obtain a shareholder
vote.  The 1940 Act requires a  shareholder  vote under  various  circumstances,
including to elect or remove  Trustees upon the written  request of shareholders
representing 10% or more of the Fund's net assets, and to change any fundamental
policy of the Fund.  Fund  shareholders  receive one vote for each dollar of net
asset value owned on the record date, and a fractional  vote for each fractional
dollar  of net  asset  value  owned  on  the  record  date.  Voting  rights  are
non-cumulative and cannot be modified without a majority vote.

  LIQUIDATION  RIGHTS.  If the  Fund is  liquidated,  each  shareholder  will be
entitled to receive, based on the number of shares held, a pro rata share of the
Fund's assets that remain after  satisfaction of all  liabilities.  Shareholders
may receive cash, securities, or a combination of the two.

     PREEMPTIVE  RIGHTS.  There are no  preemptive  rights  associated  with the
Fund's shares.

     CONVERSION  RIGHTS.  There are no  conversion  rights  associated  with the
Fund's shares.

     REDEMPTION  PROVISIONS.  The Fund's redemption  provisions are described in
its  current   prospectus   and  elsewhere  in  this   Statement  of  Additional
Information.

     SINKING FUND PROVISIONS. The Fund has no sinking fund provisions.

     CALLS OR  ASSESSMENT.  The Fund's shares,  when issued,  are fully paid and
non-assessable.

TAX STATUS OF THE FUND

The Fund  intends to continue  to qualify as a  "regulated  investment  company"
under  Subchapter M of the Internal  Revenue Code. This special tax status means
that the Fund will not be liable for  federal  tax on income and  capital  gains
distributed to shareholders.  In order to preserve its tax status, the Fund must
comply with certain  requirements.  If the Fund fails to meet these requirements
in any  taxable  year,  it will  be  subject  to tax on its  taxable  income  at
corporate rates, and all distributions from earnings and profits,  including any
distributions of net tax-exempt  income and net long-term capital gains, will be
taxable to  shareholders  as ordinary  income.  In  addition,  the Fund could be
required to recognize unrealized gains, pay substantial taxes and interest,  and
make  substantial  distributions  before regaining its tax status as a regulated
investment company.

                                      B-2

<PAGE>

                       FUNDAMENTAL INVESTMENT LIMITATIONS

The Fund is subject to the following fundamental investment  limitations,  which
cannot be changed in any  material  way without the approval of the holders of a
majority of the Fund's shares.  For these  purposes,  a "majority" of the Fund's
shares  means  shares  representing  the lesser of: (i) 67% or more of the votes
cast to approve a change,  so long as shares  representing  more than 50% of the
Fund's net asset value are present or  represented  by proxy;  or (ii) more than
50% of the Fund's net asset value.

     BORROWING. The Fund may not borrow money, except for temporary or emergency
purposes in an amount not exceeding  15% of the Fund's net assets.  The Fund may
borrow  money  through  banks,  reverse  repurchase  agreements,  or  Vanguard's
interfund  lending program only, and must comply with all applicable  regulatory
conditions.  The Fund may not make any additional investments if its outstanding
borrowings exceed 5% of net assets.

     COMMODITIES  AND OPTIONS.  The Fund may not invest in  commodities,  except
that it may invest in stock futures contracts,  options,  and options on futures
contracts.  No more than 5% of the  Fund's  total  assets may be used as initial
margin deposit for futures  contracts,  and no more than 20% of the Fund's total
assets may be invested in futures contracts or options at any time.

     DIVERSIFICATION. With respect to 75% of its total assets, the Fund may not:
(i)  purchase  more than 10% of the  outstanding  voting  securities  of any one
issuer; or (ii) purchase  securities of any issuer if, as a result, more than 5%
of the Fund's total assets would be invested in that issuer's  securities.  This
limitation does not apply to obligations of the United States  Government or its
agencies or instrumentalities.

     ILLIQUID SECURITIES. The Fund may not acquire any security if, as a result,
more  than  15% of its net  assets  would be  invested  in  securities  that are
illiquid.

     INDUSTRY CONCENTRATION.  The Fund may not invest more than 25% of its total
assets in any one industry.

     INVESTING FOR CONTROL. The Fund may not invest in a company for purposes of
controlling its management.

     INVESTMENT  COMPANIES.  The Fund may not  invest  in any  other  investment
company, except through a merger,  consolidation or acquisition of assets, or to
the extent permitted by Section 12 of the 1940 Act.  Investment  companies whose
shares the Fund acquires pursuant to Section 12 must have investment  objectives
and investment policies consistent with those of the Fund.

     LOANS.  The Fund may not lend money to any person  except (i) by purchasing
bonds or other debt securities or by entering into repurchase  agreements;  (ii)
by lending its portfolio securities;  and (iii) to another Vanguard fund through
Vanguard's interfund lending program.

     MARGIN.  The Fund may not purchase  securities on margin or sell securities
short,  except as  permitted  by the  Fund's  investment  policies  relating  to
commodities.

     OIL,  GAS,  MINERALS.  The Fund may not invest in interests in oil, gas, or
other mineral exploration or development programs.

     PLEDGING  ASSETS.  The Fund may not pledge,  mortgage,  or hypothecate more
than 15% of its net assets.

     REAL ESTATE.  The Fund may not invest directly in real estate,  although it
may invest in securities of companies that deal in real estate.

     SENIOR  SECURITIES.  The Fund may not issue  senior  securities,  except in
compliance with the 1940 Act.

     UNDERWRITING.  The Fund may not  engage  in the  business  of  underwriting
securities  issued  by  other  persons.  The  Fund  will  not be  considered  an
underwriter when disposing of its investment securities.

                                      B-3

<PAGE>


     None of these  limitations  prevents  the Fund  from  participating  in The
Vanguard  Group,  Inc.  (Vanguard).  As a member of the Group,  the Fund may own
securities  issued by  Vanguard,  make  loans to  Vanguard,  and  contribute  to
Vanguard's costs or other financial  requirements.  See "Management of the Fund"
for more information.

     Compliance  with the investment  limitations set forth above is measured at
the time securities are purchased.  If a percentage restriction is adhered to at
the time the  investment is made, a later change in percentage  resulting from a
change in the market  value of assets will not  constitute  a violation  of such
restriction.

                               PURCHASE OF SHARES

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 interest of the Fund; and (iii) to reduce or waive
the minimum  investment for or any other  restrictions on initial and subsequent
investments for certain  fiduciary  accounts (such as employee benefit plans) or
under  circumstances  where  certain  economies  can be achieved in sales of the
Fund's shares.

TRADING SHARES THROUGH CHARLES SCHWAB

The Fund has  authorized  Charles  Schwab & Co., Inc.  (Schwab) to accept on its
behalf purchase and redemption orders under certain terms and conditions. Schwab
is also  authorized to designate  other  intermediaries  to accept  purchase and
redemption  orders on the Fund's behalf  subject to those terms and  conditions.
Under this  arrangement,  the Fund will be deemed to have received a purchase or
redemption order when Schwab or, if applicable,  Schwab's  authorized  designee,
accepts the order in accordance  with the Fund's  instructions.  Customer orders
that are properly transmitted to the Fund by Schwab, or if applicable,  Schwab's
authorized designee, will be priced as follows:

          Orders  received by Schwab before 3 p.m.  Eastern time on any business
     day will be sent to Vanguard that day and your share price will be based on
     the Fund's net asset  value  calculated  at the close of trading  that day.
     Orders  received  by  Schwab  after  3 p.m.  Eastern  time  will be sent to
     Vanguard on the  following  business day and your share price will be based
     on the Fund's net asset value calculated at the close of trading that day.

                              REDEMPTION OF SHARES

The Fund may suspend  redemption  privileges or postpone the date of payment for
redeemed  shares (i) during any  period  that the New York Stock  Exchange  (the
Exchange) is closed or trading on the Exchange is  restricted,  as determined by
the Commission;  (ii) during any period when an emergency  exists, as defined by
the  Commission,  as a result of which it is not reasonably  practicable for the
Fund to dispose of securities  owned by it or fairly  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.

     No charge is made by the Fund for redemptions. Shares redeemed may be worth
more or less than what was paid for them,  depending  on the market value of the
securities held by the Fund.

                                      B-4

<PAGE>

                             MANAGEMENT OF THE FUND

OFFICERS AND TRUSTEES

The officers of the Fund manage its day-to-day operations and are responsible to
the Fund's Board of Trustees.  The Trustees set broad  policies for the Fund and
choose its officers. The following is a list of the Trustees and officers of the
Fund and a statement of their present positions and principal occupations during
the past five years. As a group,  the Fund's Trustees and officers own less than
1% of the outstanding shares of the Fund. Each Trustee also serves as a Director
of The  Vanguard  Group,  Inc.,  and as a  Trustee  of  each  of the  103  funds
administered  by Vanguard (102 in the case of Mr.  Malkiel and 93 in the case of
Mr.  MacLaury).  The mailing address of the Trustees and officers of the Fund is
Post Office Box 876, Valley Forge, PA 19482.




JOHN J.  BRENNAN  (DOB:  7/29/1954),  Chairman,  Chief  Executive  Officer,  and
Trustee* Chairman,  Chief Executive Officer, and Director of The Vanguard Group,
Inc., and Trustee of each of the investment companies in The Vanguard Group.

JOANN  HEFFERNAN  HEISEN  (DOB:  1/25/1950),   Trustee  Vice  President,   Chief
Information  Officer,  and member of the  Executive  Committee  of  Johnson  and
Johnson (Pharmaceuticals/Consumer Products), Director of Johnson & Johnson*MERCK
Consumer  Pharmaceuticals  Co.,  The Medical  Center at  Princeton,  and Women's
Research and Education Institute.

BRUCE K. MACLAURY (DOB:  5/7/1931),  Trustee President Emeritus of The Brookings
Institution  (Independent  Non-Partisan  Research  Organization);   Director  of
American  Express  Bank,  Ltd.,  The St. Paul  Companies,  Inc.  (Insurance  and
Financial Services), and National Steel Corp.

BURTON G. MALKIEL (DOB:  8/28/1932),  Trustee Chemical Bank Chairman's Professor
of Economics,  Princeton  University;  Director of  Prudential  Insurance Co. of
America, Banco Bilbao Gestinova,  Baker Fentress & Co. (Investment  Management),
The Jeffrey Co. (Holding Company), and Select Sector SPDR Trust (Exchange-Traded
Mutual Fund).

ALFRED M. RANKIN,  JR. (DOB:  10/8/1941),  Trustee  Chairman,  President,  Chief
Executive  Officer,  and  Director of NACCO  Industries,  Inc.  (Machinery/Coal/
Appliances);     and    Director    of    The    BFGoodrich    Co.     (Aircraft
Systems/Manufacturing/Chemicals).

JOHN C. SAWHILL (DOB: 6/12/1936),  Trustee President and Chief Executive Officer
of The Nature Conservancy  (Non-Profit  Conservation Group); Director of Pacific
Gas and  Electric  Co.,  Procter  &  Gamble  Co.,  and  NACCO  Industries,  Inc.
(Machinery/Coal/Appliances),  and Newfield  Exploration Co. (Energy);  formerly,
Director  and  Senior  Partner  of  McKinsey & Co.,  and  President  of New York
University.

JAMES O.  WELCH,  JR.  (DOB:  5/13/1931),  Trustee  Retired  Chairman of Nabisco
Brands, Inc. (Food Products);  retired Vice Chairman and Director of RJR Nabisco
(Food and Tobacco Products); Director of TECO Energy, Inc., and Kmart Corp.

J. LAWRENCE WILSON (DOB: 3/2/1936),  Trustee Retired Chairman of Rohm & Haas Co.
(Chemicals);  Director of Cummins Engine Co. (Diesel  Engine  Company),  and The
Mead Corp.  (Paper  Products);  and  AmeriSource  Health  Corp.;  and Trustee of
Vanderbilt University.

RAYMOND J.  KLAPINSKY  (DOB:  12/7/1938),  Secretary*  Managing  Director of The
Vanguard Group,  Inc.;  Secretary of The Vanguard Group, Inc. and of each of the
investment companies in The Vanguard Group.

THOMAS J. HIGGINS (DOB: 5/21/1957),  Treasurer* Principal of The Vanguard Group,
Inc.; Treasurer of each of the investment companies in The Vanguard Group.

                                      B-5

<PAGE>

ROBERT D. SNOWDEN (DOB: 9/4/1961),  Controller* Principal of The Vanguard Group,
Inc.; Controller of each of the investment companies in The Vanguard Group.

* Officers of the Fund are "interested persons" as defined in the 1940 Act.

THE VANGUARD GROUP

Vanguard  Convertible  Securities  Fund is a  member  of The  Vanguard  Group of
Investment  Companies.  Through  their  jointly-owned  subsidiary,  The Vanguard
Group, Inc., the Fund, and the other funds in the Group obtain at cost virtually
all of their corporate management,  administrative,  and distribution  services.
Vanguard  also  provides  investment  advisory  services on an at-cost  basis to
several of the Vanguard funds.

     Vanguard  employs  a  supporting  staff of  management  and  administrative
personnel  needed  to  provide  the  requisite  services  to the  funds and also
furnishes the funds with  necessary  office space,  furnishings,  and equipment.
Each fund pays its share of Vanguard's total expenses, which are allocated among
the funds under  methods  approved  by the Board of  Trustees  of each fund.  In
addition,  each fund bears its own direct expenses such as legal,  auditing, and
custodian fees. In order to generate  additional revenues and thereby reduce the
funds' expenses, Vanguard also provides certain administrative services to other
organizations.

     Vanguard  adheres to a Code of Ethics  established  pursuant  to Rule 17j-1
under the 1940 Act.  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  similar  to,  and in many cases more  restrictive  than,  those
recommended by a blue ribbon panel of mutual fund industry executives.

     Vanguard was  established and operates under an Amended and Restated Funds'
Service  Agreement which was approved by the  shareholders of each of the funds.
The amounts  which each of the funds has invested in Vanguard are adjusted  from
time to time in order to maintain the  proportionate  relationship  between each
fund's  relative net assets and its  contribution  to  Vanguard's  capital.  The
Amended and Restated  Funds'  Service  Agreement  provides as follows:  (a) each
Vanguard fund may be called upon to invest up to 0.40% of its current  assets in
Vanguard;  and (b)  there is no  other  limitation  on the  dollar  amount  each
Vanguard fund may contribute to Vanguard's capitalization. At November 30, 1999,
the Convertible  Securities Fund had contributed capital of $35,000 to Vanguard,
representing   0.02%  of  the  Fund's   net  assets  and  0.04%  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.

     DISTRIBUTION.  Vanguard Marketing Corporation, a wholly-owned subsidiary of
The Vanguard Group, Inc., provides all distribution and marketing activities for
the funds in the Group. 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 Vanguard. The Trustees and
officers of Vanguard  determine the amount to be spent annually on  distribution
activities,  the  manner and  amount to be spent on each  fund,  and  whether to
organize new investment companies.

     One-half of the distribution expenses of a marketing and promotional nature
is  allocated  among the funds based upon  relative  net assets.  The  remaining
one-half of those  expenses is allocated  among the funds based upon each fund's
sales for the  preceding 24 months  relative to the total sales of all the funds
as a Group; provided, however, that no fund's aggregate quarterly rate of

                                      B-6

<PAGE>


contribution  for  distribution  expenses of a marketing and promotional  nature
shall exceed 125% of the average  distribution  expense rate for  Vanguard,  and
that no fund shall incur annual distribution expenses in excess of 0.02 of 1% of
its average month-end net assets.

     During the fiscal years ended  November 30, 1997,  1998, and 1999, the Fund
incurred the following  approximate  amounts of The Vanguard Group's  management
(including transfer agency),  distribution,  and marketing  expenses:  $468,000,
$529,000, and $535,000, respectively.

     INVESTMENT   ADVISORY  SERVICES.   Vanguard  provides  investment  advisory
services to several  Vanguard  funds.  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.

TRUSTEE COMPENSATION

The  same  individuals  serve  as  Trustees  of all  Vanguard  funds  (with  two
exceptions,  which are noted in the table  appearing on page B-8), and each fund
pays a proportionate share of the Trustees' compensation. The funds employ their
officers on a shared  basis,  as well.  However,  officers  are  compensated  by
Vanguard, not the funds.

     INDEPENDENT TRUSTEES. The funds compensate their independent Trustees--that
is, the ones who are not also officers of the Fund--in three ways:

- -    The  independent  Trustees  receive an annual fee for their  service to the
     funds, which is subject to reduction based on absences from scheduled Board
     meetings.

- -    The  independent  Trustees are reimbursed for the travel and other expenses
     that they incur attending Board meetings.

- -    Upon retirement,  the independent  Trustees receive an aggregate annual fee
     of  $1,000  for each year  served  on the  Board,  up to  fifteen  years of
     service.  This annual fee is paid for ten years  following  retirement,  or
     until each Trustee's death.

     "INTERESTED"  TRUSTEE.  Mr. Brennan serves as a Trustee, but is not paid in
this  capacity.  He is,  however,  paid in his role as officer  of The  Vanguard
Group, Inc.

     COMPENSATION TABLE. The following table provides  compensation  details for
each of the Trustees.  We list the amounts paid as  compensation  and accrued as
retirement benefits by the Fund for each Trustee.  In addition,  the table shows
the total  amount of benefits  that we expect each  Trustee to receive  from all
Vanguard funds upon  retirement,  and the total amount of  compensation  paid to
each Trustee by all Vanguard funds.

                                      B-7

<PAGE>

                      VANGUARD CONVERTIBLE SECURITIES FUND
                          TRUSTEES' COMPENSATION TABLE

<TABLE>

<CAPTION>
<S>                     <C>             <C>                  <C>                <C>
                                           PENSION OR                                 TOTAL
                         AGGREGATE         RETIREMENT                             COMPENSATION
                        COMPENSATION    BENEFITS ACCRUED     ESTIMATED ANNUAL   FROM ALL VANGUARD
                         FROM THIS      AS PART OF THESE      BENEFITS UPON       FUNDS PAID TO
 NAMES OF TRUSTEES        FUND(1)       FUND'S EXPENSES(1)      RETIREMENT         TRUSTEES(2)
- --------------------------------------------------------------------------------------------------
John C. Bogle(3)           None               None                  None               None
John J. Brennan            None               None                  None               None
Barbara Barnes
 Hauptfuhrer(3)              $3                 $1               $15,000                 $0
JoAnn Heffernan Heisen      $36                 $2               $15,000            $80,000
Bruce K. MacLaury           $37                 $4               $12,000            $75,000
Burton G. Malkiel           $37                 $3               $15,000            $80,000
Alfred M. Rankin, Jr.       $36                 $2               $15,000            $80,000
John C. Sawhill             $36                 $3               $15,000            $80,000
James O. Welch, Jr.         $36                 $3               $15,000            $80,000
J. Lawrence Wilson          $36                 $2               $15,000            $80,000
</TABLE>

(1)  The amounts  shown in this column are based on the Funds' fiscal year ended
     November 30, 1999.
(2)  The amounts reported in this column reflect the total  compensation paid to
     each Trustee for his or her service as Trustee of 103  Vanguard  funds (102
     in the case of Mr.  Malkiel;  93 in the case of Mr.  MacLaury) for the 1999
     calendar year.
(3)  Mr.  Bogle  and  Mrs.  Hauptfuhrer  have  retired  from the  funds'  Board,
     effective December 31, 1999 and December 31, 1998, respectively.

                          INVESTMENT ADVISORY SERVICES

The Fund has entered into an investment  advisory agreement with Oaktree Capital
Management,  LLC  (Oaktree)  under  which  Oaktree  manages the  investment  and
reinvestment of the assets of the Fund and continuously reviews, supervises, and
administers   the   Fund's   investment   program.    Oaktree   discharges   its
responsibilities subject to the control of the Fund's officers and Trustees.

     Under the  agreement,  the Fund pays  Oaktree 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 (the Basic Fee):


NET ASSETS                               ANNUAL RATE
- ----------                               -----------
First $100 million ....................     0.425%
Next $100 million .....................     0.400%
Next $100 million .....................     0.375%
Next $100 million .....................     0.350%
Assets in excess of $400 million ......     0.325%

     Beginning  November  30,  1997,  the Basic Fee  payment to  Oaktree  may be
increased or decreased by a Performance  Fee Adjustment  (the  Adjustment).  The
Adjustment is a percentage of the Basic Fee and changes proportionately with the
investment performance of the Fund relative to the investment performance of the
First Boston Convertible  Securities Index (the Index). The following table sets
forth the  Adjustment  of the Basic Fee payable by the Fund to Oaktree under the
investment advisory agreement.

                                      B-8

<PAGE>

     The  Adjustment  will be calculated  as follows,  using data from the table
below:

                                         PERFORMANCE FEE
                                         ADJUSTMENT AS A
CUMULATIVE PERFORMANCE OF THE FUND        PERCENTAGE OF
VS. THE INDEX FOR THE RELEVANT PERIOD       BASIC FEE
- -------------------------------------    ---------------
- -100% of Performance Factor or more ...       -50%
- -1% to -99% of Performance Factor .....     0 to -50%
- -0- ...................................         0
+1% to +99% of Performance Factor .....     0 to +50%
+100% of Performance Factor or more ...       +50%

     To  calculate  the  Adjustment  for a given  quarter,  (1) for the Relevant
Period  for that  quarter  as set forth in the  following  table  (the  Relevant
Period),  the difference between the investment  performance of the Fund and the
investment  performance  of the Index  (the  Performance  Differential)  will be
calculated; (2) the Performance Differential will be compared to the Performance
Factor  specified by the table for that period to determine  the extent to which
an  Adjustment  is in  order;  and (3) the  Adjustment  will be the  appropriate
percentage  of the Basic Fee* for an average  quarter  in that  Relevant  Period
determined from the table above.

*For purposes of this  calculation,  the  relevant  Basic Fee is  calculated  by
 applying the quarterly rate against average assets over the relevant period for
 which performance is measured.

                                                               PERFORMANCE
QUARTER ENDING                          RELEVANT PERIOD       FACTOR (B.P.)
- --------------                          ---------------       -------------
Before 11/30/1997                      --no adjustment--    --no adjustment--
11/30/1997                           12/1/1996-11/30/1997          67
2/28/1998                             12/1/1996-2/28/1998          83
5/31/1998                             12/1/1996-5/31/1998         100
8/31/1998                             12/1/1996-8/31/1998         117
11/30/1998                           12/1/1996-11/30/1998         133
2/28/1999                             12/1/1996-2/28/1999         150
5/31/1999                             12/1/1996-5/31/1999         167
8/31/1999                             12/1/1996-8/31/1999         183
11/30/1999                           12/1/1996-11/30/1999         200
After 11/30/1999                        prior 36 months           200

     The investment performance of the Fund for any given period, expressed as a
percentage  of its net asset value per share at the  beginning  of such  period,
shall be the sum of:  (i) the  change in the  Fund's  net asset  value per share
during  such  period;  (ii)  the  value  of the  cash  distributions  per  share
accumulated  to the end of such  period;  and (iii) the value of  capital  gains
taxes per share paid or payable by the Fund on undistributed  realized long-term
capital gains accumulated to the end of such period. For this purpose, the value
of  distributions  per share of realized  capital gains,  of dividends per share
paid from  investment  income,  and of  capital  gains  taxes per share  paid or
payable on undistributed  realized  long-term capital gains, shall be treated as
reinvested  in shares of the Fund at the net asset  value per share in effect at
the close of business  on the record date for the payment of such  distributions
and  dividends  and the date on which  provision  is made for such taxes,  after
giving effect to such distributions, dividends, and taxes.

     The  investment  record  of  the  Index  for  the  period,  expressed  as a
percentage of the Index level at the  beginning of the period,  shall be the sum
of (i) the  change in the  level of the Index  during  the  period  and (ii) the
value,  computed  consistently with the Index, of cash  distributions  having an
ex-dividend  date occurring within the period made by companies whose securities
comprise the Index.

                                      B-9

<PAGE>


     During the fiscal years ended  November 30, 1997,  1998, and 1999, the Fund
incurred the following investment advisory fees:

                                                  1997         1998        1999
                                                  ----         ----        ----
Basic Fee .................................   $731,000     $770,000    $695,000
Increase or Decrease for Performance
Adjustment ................................    (91,000)      (3,000)   (369,000)
                                              ---------    ---------   ---------
Total                                         $640,000     $767,000    $326,000

     The investment advisory agreement has a term of one year. To be renewed for
an additional  one-year term, the agreement must be  specifically  approved by a
vote of the Fund's  Board of  Trustees,  including  the  affirmative  votes of a
majority of the  Trustees who are not parties to the  agreement  or  "interested
persons"  (as  defined  in the 1940 Act) of any such  party.  The  agreement  is
automatically  terminated if assigned,  and may be terminated without penalty at
any time (1) by vote of the Board of  Trustees  of the Fund on 60 days'  written
notice to Oaktree, or (2) by Oaktree upon 60 days' written notice to the Fund.

DESCRIPTION OF OAKTREE

Oaktree  Capital  Management,  LLC  specializes  in  selected  niche  investment
markets.  The founders of Oaktree  formed the company in April 1995 after having
managed  convertible  securities,  distressed debt, and high yield bond accounts
for Trust Company of the West (TCW) since 1985.

     Larry W. Keele,  Principal and one of the five founders of Oaktree,  serves
as the Fund's manager.  Mr. Keele is supported by research and other  investment
services provided by the professional staff of Oaktree. As of November 30, 1999,
Oaktree managed approximately $15 billion.

                             PORTFOLIO TRANSACTIONS

The investment  advisory agreement  authorizes Oaktree (with the approval of the
Fund's Board of Trustees) to select the brokers or dealers that will execute the
purchases and sales of portfolio  securities for the Fund and directs Oaktree to
use its best  efforts  to obtain  the best  available  price and most  favorable
execution as to all transactions for the Fund. Oaktree has 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,  Oaktree will use its best judgment to
choose the broker most capable of providing the brokerage  services necessary to
obtain the best available price and most favorable execution. The full range and
quality of  brokerage  services  available  will be  considered  in making these
determinations.  In those instances where it is reasonably  determined that more
than one  broker  can offer the  brokerage  services  needed to obtain  the best
available  price and most  favorable  execution,  consideration  may be given to
those brokers which supply investment  research and statistical  information and
provide other services in addition to execution  services to the Fund and/or the
adviser.  Oaktree  considers such  information  useful in the performance of its
obligations under the agreement,  but is unable to determine the amount by which
such services may reduce its expenses.

     The investment advisory agreement also incorporates the concepts of Section
28(e) of the Securities  Exchange Act of 1934 by providing that,  subject to the
approval of the Fund's Board of Trustees,  the adviser may cause the Fund to pay
a  broker-dealer  which  furnishes  brokerage  and  research  services  a higher
commission  than that  which  might be  charged  by  another  broker-dealer  for
effecting  the  same  transaction;  provided  that  such  commission  is  deemed
reasonable  in  terms of  either  that  particular  transaction  or the  overall
responsibilities of the adviser to the Fund.

     Currently,  it is the Fund's  policy  that  Oaktree 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. Oaktree will only pay such higher

                                      B-10

<PAGE>


commissions  if it believes  this to be in the best  interest of the Fund.  Some
brokers or dealers who may receive such higher  commissions  in  recognition  of
brokerage  services  related to execution of  securities  transactions  are also
providers  of  research  information  to the adviser  and/or the Fund.  However,
Oaktree has informed the Fund that it generally  will not pay higher  commission
rates specifically for the purpose of obtaining research services.

     During the fiscal years ended  November 30, 1997,  1998,  and 1999 the Fund
paid $41,776, $72,951, and $51,858 in brokerage commissions, respectively.

     Some  securities  considered  for  investment  by  the  Fund  may  also  be
appropriate  for other  clients  served by the  adviser.  If purchase or sale of
securities  consistent with the investment  policies of the Fund and one or more
of these other  clients  serviced by the adviser are  considered at or about the
same time,  transactions in such securities will be allocated among the Fund and
such other clients in a manner deemed  equitable by the adviser.  Although there
may be no specified  formula for allocating  such  transactions,  the allocation
methods  used and the  results of such  allocations  will be subject to periodic
review by the Fund's Board of Trustees.

                              INVESTMENT POLICIES

The following  policies  supplement the Fund's investment  policies set forth in
the Prospectus.

     FUTURES  CONTRACTS  AND  OPTIONS.  The Fund may enter  into  stock  futures
contracts,  options, and options on futures contracts for the following 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. Assets committed to futures contracts will be segregated
to the extent required by law.

     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",  "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 that 5% of the value of the contract being traded.

     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 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

                                      B-11

<PAGE>

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  market  value of the  underlying
securities. The Fund intends to use futures contracts only for bona fide hedging
purposes.

     Regulations  of the CFTC  applicable  to the Fund  require  that all of its
futures  transactions  constitute bona fide hedging  transactions  except to the
extent that the aggregate initial margins and premiums required to establish any
non-hedging  positions  do not  exceed  five  percent of the value of the Fund's
portfolio.  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 exposure of a Fund's income to  fluctuations in the
market value of the underlying securities, 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
portfolio 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 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.

     Risks 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 to effectively  hedge.  The Fund will minimize the
risk that it will be unable to close  out a futures  contract  by only  entering
into futures  contracts which are traded on national  futures  exchanges and for
which there appears to be a liquid secondary market.

     The risk of loss in trading  futures  contracts in some  strategies  can be
substantial,  due both to the low margin  deposits  required,  and the extremely
high degree of leverage  involved in futures 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.  However,  because the futures
strategies of the Fund are engaged in only for hedging purposes,  the investment
adviser  does  not  believe  that  the  Fund is  subject  to the  risks  of loss
frequently associated with futures transactions.  The Fund would presumably have
sustained comparable losses if, instead of the futures contract, it had invested
in the underlying financial instrument and sold it after the decline.

                                      B-12

<PAGE>

     Utilization  of  futures  transactions  by the  Fund  involves  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 experience
a decline in the 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  as of the end of the year as
well as those  actually  realized  during the year. In these 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.  Gains and losses on certain other
futures  contracts  (primarily  non-U.S.  futures  contracts) are not recognized
until the  contracts  are closed  and are  treated as  long-term  or  short-term
depending  on the holding  period of the  contract.  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,  and gains from the sale of
securities or foreign  currencies,  or other income  derived with respect to its
business  of  investing  in  such  stock,  securities,   or  currencies.  It  is
anticipated that any net gain recognized on futures contracts will be considered
qualifying income for purposes of the 90% requirement.

     The Fund will  distribute  to  shareholders  annually any net capital gains
which  have  been   recognized  for  federal  income  tax  purposes  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.  The  Fund  may  invest  up to 20% of its  assets  in
securities of foreign companies.  The Fund anticipates that all or virtually all
of the foreign  securities it owns will be U.S.  dollar  denominated.  Investors
should  recognize that investing in foreign  companies  involves certain special
considerations  which  are  not  typically  associated  with  investing  in U.S.
companies.

     Currency  Risk.  Because the foreign  securities  owned by the Fund will be
overwhelmingly U.S. dollar denominated, there will be little or no currency risk
in the typical sense--i.e.,  the value of the Fund's foreign securities will not
fluctuate  directly in response to changes in currency exchange rates.  However,
if the currency of an issuer's country  decreases  against the dollar,  it could
lead to a decrease in the value of the issuer's  common  stock in dollar  terms.
That,  in turn,  could  negatively  affect  the  value  of a  dollar-denominated
security that is convertible into the issuer's common stock.

     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

                                      B-13

<PAGE>

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  possibility  of  expropriation  or
confiscatory   taxation,   political  or  social   instability,   or  diplomatic
developments  which could affect the value of securities  issued by companies in
those countries.

     FEDERAL TAX  TREATMENT OF NON-U.S.  TRANSACTIONS.  Special rules govern the
Federal income tax treatment of certain  transactions  denominated in terms of a
currency  other than the U.S.  dollar or determined by reference to the value of
one or more  currencies  other than the U.S.  dollar.  The types of transactions
covered by the special rules include the following:  (i) the  acquisition of, or
becoming the obligor under, a bond or other debt instrument  (including,  to the
extent provided in Treasury regulations,  preferred stock); (ii) the accruing of
certain  trade  receivables  and  payables;  and  (iii)  the  entering  into  or
acquisition  of any  forward  contract,  futures  contract,  option  or  similar
financial instrument if such instrument is not marked to market. The disposition
of a currency other than the U.S. dollar by a taxpayer whose functional currency
is the U.S.  dollar is also  treated as a  transaction  subject  to the  special
currency rules. However,  foreign  currency-related  regulated futures contracts
and nonequity options are generally not subject to the special currency rules if
they are or would be  treated as sold for their fair  market  value at  year-end
under the  marking-to-market  rules applicable to other futures contracts unless
an  election  is made  to have  such  currency  rules  apply.  With  respect  to
transactions  covered by the special  rules,  foreign  currency  gain or loss is
calculated separately from any gain or loss on the underlying transaction and is
normally  taxable as ordinary  income or loss.  A taxpayer may elect to treat as
capital  gain or  loss  foreign  currency  gain or  loss  arising  from  certain
identified  forward  contracts,  futures  contracts and options that are capital
assets in the hands of the  taxpayer  and which are not part of a straddle.  The
Treasury Department issued regulations under which certain  transactions subject
to  the  special  currency  rules  that  are  part  of a  "section  988  hedging
transaction" (as defined in the Internal  Revenue Code of 1986, as amended,  and
the Treasury regulations) will be integrated and treated as a single transaction
or otherwise  treated  consistently  for purposes of the Code.  Any gain or loss
attributable to the foreign currency component of a transaction  engaged in by a
fund which is not subject to the special  currency rules (such as foreign equity
investments  other than certain preferred stock) will be treated as capital gain
or loss  and  will not be  segregated  from  the gain or loss on the  underlying
transaction.  It is  anticipated  that some of the  non-U.S.  dollar-denominated
investments and foreign currency  contracts the Fund may make or enter into will
be subject to the special currency rules described above.

     ILLIQUID AND  RESTRICTED  SECURITIES.  The Fund may invest up to 15% of its
net assets in 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.

     The Fund may invest in restricted,  privately placed securities that, under
securities  laws, may be sold only to qualified  institutional  buyers.  Because
these securities can be resold only to qualified  institutional buyers, they may
be considered illiquid  securities--meaning that they could be difficult for the
Fund to convert to cash if needed.

     If a  substantial  market  develops for a restricted  security  held by the
Fund, it will be treated as a liquid security, in accordance with procedures and
guidelines  approved by the Fund's Board of Trustees.  This  generally  includes
securities  that are  unregistered  that can be sold to qualified  institutional
buyers in accordance  with Rule 144A under the  Securities Act of 1933 (the 1933
Act). While the Fund's investment adviser determines the liquidity of restricted
securities  on  a  daily  basis,   the  Board  oversees  and  retains   ultimate
responsibility  for the  adviser's  decisions.  Several  factors  that the Board
considers in monitoring these decisions include the valuation of a security, the
availability  of  qualified   institutional  buyers,  and  the  availability  of
information about the security's issuer.

                                      B-14

<PAGE>


     REPURCHASE  AGREEMENTS.  The Fund,  either  alone or  together  with  other
members  of the  Vanguard  Group,  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
fixed-income  security (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  Trustees   monitors   repurchase   agreement
transactions generally and has established guidelines and standards for a review
by the investment adviser of the creditworthiness of any bank, broker, or dealer
that is a counterparty to a repurchase agreement.

     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  bankruptcy  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 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  adviser
acknowledges  these risks,  it is expected that they can be  controlled  through
careful monitoring procedures.

     LENDING  OF  SECURITIES.  The Fund may lend its  investment  securities  to
qualified institutional  investors (typically brokers,  dealers, banks, or other
financial  institutions)  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  investment
securities,  the Fund attempts to increase its net investment 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 terms and the structure  and the  aggregate  amount of
such loans must be consistent  with the 1940 Act, and the Rules and  Regulations
or  interpretations  of the Commission  thereunder.  These  provisions limit the
amount of  securities  the Fund may lend to 33/1//3% of the Fund's total assets,
and require that (a) the borrower  pledge and maintain with the Fund  collateral
consisting of cash,  an  irrevocable  letter of credit or  securities  issued or
guaranteed  by the United  States  Government  having at all times not less than
100%  of the  value  of the  securities  loaned,  (b) the  borrower  add 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 be made  subject  to
termination  by the  Fund  at any  time,  and (d) the  Fund  receive  reasonable
interest on the loan (which may include the Fund's investing any cash collateral
in interest  bearing  short-term  investments),  any  distribution on the loaned
securities,  and any increase in their market value.  Loan  arrangements made by
the  Fund  will  comply  with  all  other  applicable  regulatory  requirements,
including the rules of the Exchange, which 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 Trustees.

     At  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 Trustees. In addition, voting rights

                                      B-15

<PAGE>

pass with the loaned securities, but if a material event occurs that affects the
loaned securities, the loan must be called and the securities voted.

     VANGUARD INTERFUND LENDING PROGRAM.  The Commission has issued an exemptive
order  permitting  the  Fund to  participate  in  Vanguard's  interfund  lending
program.  This program  allows the Vanguard  funds to borrow money from and loan
money to each other for temporary or emergency purposes.  The program is subject
to a number of conditions,  including the requirement that no fund may borrow or
lend money through the program unless it receives a more favorable interest rate
than is available from a typical bank for a comparable transaction. In addition,
a fund may  participate  in the  program  only if and to the  extent  that  such
participation  is  consistent  with the fund's  investment  objective  and other
investment  policies.   The  Boards  of  Trustees  of  the  Vanguard  funds  are
responsible  for  ensuring  that  the  interfund  lending  program  operates  in
compliance with all conditions of the Commission's exemptive order.

     TEMPORARY INVESTMENTS.  The Fund may take temporary defensive measures that
are  inconsistent  with  the  Fund's  normal   fundamental  or   non-fundamental
investment  policies and  strategies  in response to adverse  market,  economic,
political,  or other conditions.  Such measures could include investments in (a)
highly  liquid  short-term  fixed-income  securities  issued  by or on behalf of
municipal or  corporate  issuers,  obligations  of the U.S.  Government  and its
agencies,  commercial  paper,  and bank  certificates of deposit;  (b) shares of
other  investment  companies  which have investment  objectives  consistent with
those of the Fund; (c) repurchase agreements involving any such securities;  and
(d) other money market instruments. There is no limit on the extent to which the
Fund may take temporary  defensive measures.  In taking such measures,  the Fund
may fail to achieve its investment objective.

                              FINANCIAL STATEMENTS

The Fund's Financial  Statements for the year ended November 30, 1999, including
the financial  highlights  for each of the five fiscal years in the period ended
November 30, 1999,  appearing in the Fund's 1999 Annual Report to  Shareholders,
and the report thereon of  PricewaterhouseCoopers  LLP independent  accountants,
also  appearing  therein,  are  incorporated  by reference in this  Statement of
Additional  Information.  For a more  complete  discussion  of the  performance,
please see the  Fund's  Annual  Report to  Shareholders,  which may be  obtained
without charge.

                             YIELD AND TOTAL RETURN

The yield of the Fund for the 30-day period ended November 30, 1999 was 3.16%.

     The Fund's  average annual total return for the one-,  five-,  and ten-year
periods ended November 30, 1999 was 24.85%, 13.54%, and 11.54%, respectively.

AVERAGE ANNUAL TOTAL RETURN

Average annual total return is the average annual  compounded rate of return for
the  periods of one year,  five  years,  ten years or the life of the Fund,  all
ended on the last day of a recent month.  Average annual total return quotations
will  reflect  changes  in the price of the Fund's  shares  and assume  that all
dividends and capital gains  distributions  during the  respective  periods were
reinvested in Fund shares.

     Average  annual total return is  calculated  by finding the average  annual
compounded  rates of  return of a  hypothetical  investment  over  such  periods
according  to the  following  formula  (average  annual  total  return  is  then
expressed as a percentage):

                              T = (ERV/P)/1/N/ -1

                                      B-16

<PAGE>

Where:

T    =average annual total return
P    =a hypothetical initial investment of $1,000
n    =number of years
ERV  =ending  redeemable  value:  ERV is the value, at the end of the applicable
      period, of a hypothetical  $1,000  investment made at the beginning of the
      applicable period

AVERAGE ANNUAL AFTER-TAX TOTAL RETURN QUOTATION

We calculate the Fund's  average  annual  after-tax  total return by finding the
average annual  compounded  rate of return over the 1-, 5-, and 10-year  periods
that would equate the initial amount invested to the after-tax value,  according
to the following formulas:

                                P (1+T)/N/ = ATV

Where:

P    =a hypothetical initial payment of $1,000
T    =average annual after-tax total return
n    =number of years
ATV  =after-tax  value  at the  end of the  1-,  5-,  or  10-year  periods  of a
      hypothetical  $1,000  payment  made at the beginning  of the time  period,
      assuming no  liquidation  of the investment at the end of the  measurement
      periods

Instructions.

1.Assume all  distributions  by the Fund are  reinvested--less  the taxes due on
  such  distributions--at the price on the reinvestment dates during the period.
  Adjustments may be made for subsequent re-characterizations of distributions.

2.Calculate the taxes due on  distributions  by the Fund by applying the highest
  federal  marginal  tax rates to each  component  of the  distributions  on the
  reinvestment date (e.g.,  ordinary income,  short-term capital gain, long-term
  capital gain, etc.). For periods after December 31, 1997, the federal marginal
  tax  rates  used for the  calculations  are  39.6%  for  ordinary  income  and
  short-term  capital gains and 20% for long-term  capital gains.  Note that the
  applicable tax rates may vary over the measurement period. Assume no taxes are
  due on the  portions of any  distributions  classified  as exempt  interest or
  non-taxable  (i.e.,  return of capital).  Ignore any potential tax liabilities
  other than federal tax liabilities (e.g., state and local taxes).

3.Include all recurring fees that are charged to all shareholder  accounts.  For
  any  account  fees that vary with the size of the  account,  assume an account
  size  equal to the  Fund's  mean (or  median)  account  size.  Assume  that no
  additional  taxes or tax credits result from any redemption of shares required
  to pay such fees.

4.State the total return quotation to the nearest hundredth of one percent.

CUMULATIVE TOTAL RETURN

Cumulative  total  return is the  cumulative  rate of  return on a  hypothetical
initial  investment of $1,000 for a specified  period.  Cumulative  total return
quotations reflect changes in the price of the Fund's shares and assume that all
dividends and capital gains  distributions  during the period were reinvested in
Fund shares.  Cumulative  total return is calculated  by finding the  cumulative
rates of a return of a hypothetical  investment over such periods,  according to
the  following  formula   (cumulative  total  return  is  then  expressed  as  a
percentage):

                                 C = (ERV/P)-1

                                      B-17

<PAGE>

Where:

C    =cumulative total return
P    =a hypothetical initial investment of $1,000
ERV  =ending  redeemable  value:  ERV is the value, at the end of the applicable
      period, of a hypothetical  $1,000  investment made at the beginning of the
      applicable period

SEC YIELDS

Yield is the net  annualized  yield based on a  specified  30-day (or one month)
period  assuming  semiannual  compounding  of  income.  Yield is  calculated  by
dividing the net  investment  income per share  earned  during the period by the
maximum offering price per share on the last day of the period, according to the
following formula:

                          YIELD = 2[((A-B)/CD+1)/6/-1]

Where:

a    =dividends and interest earned during the period
b    =expenses accrued for the period (net of reimbursements)
c    =the average daily number of shares outstanding during the period that were
      entitled to receive dividends
d    =the maximum offering price per share on the last day of the period

                                  SHARE PRICE

The Fund's  share  price,  or "net asset  value" per  share,  is  calculated  by
dividing the Fund's total assets,  less all liabilities,  by the total number of
shares  outstanding.  The net asset value is  determined  as of the close of the
Exchange,  generally  4:00 p.m.  Eastern  time, on each day that the Exchange is
open for trading.

     Portfolio  securities  for which market  quotations  are readily  available
(including those securities listed on national securities exchanges,  as well as
those quoted on the NASDAQ Stock Market) will be valued at the last quoted sales
price on the day the  valuation  is made.  If such a security is not traded on a
valuation  date, it will be valued at the mean of the bid and ask prices.  Price
information on  exchange-listed  securities is 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.

     Short term instruments (those with remaining maturities of 60 days or less)
may be valued at cost,  plus or minus any amortized  discount or premium,  which
approximates market value.

     Bonds  and  other  fixed-income  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 no quotations are readily  available
or which are restricted as to sale (or resale) are valued by such methods as the
Board of Trustees deems in good faith to reflect fair value.

     The share price for the Fund can be found daily in the mutual fund listings
of most major newspapers under the heading of Vanguard Funds.

                                      B-18

<PAGE>

                              COMPARATIVE INDEXES

Each  of  the  investment  company  members  of  Vanguard,   including  Vanguard
Convertible  Securities  Fund,  may,  from time to time,  use one or more of the
following unmanaged indexes for comparative performance purposes.

STANDARD & POOR'S 500 COMPOSITE STOCK PRICE  INDEX--includes  stocks selected by
Standard & Poor's  Index  Committee  to  include  leading  companies  in leading
industries and to reflect the U.S. stock market.

STANDARD & POOR'S  MIDCAP 400  INDEX--is  composed of 400 medium sized  domestic
stocks.

STANDARD & POOR'S 500/BARRA VALUE  INDEX--consists of the stocks in the Standard
& Poor's 500 Composite Stock Price Index with the lowest  price-to-book  ratios,
comprising 50% of the market capitalization of the S&P 500.

STANDARD & POOR'S  SMALLCAP  600/BARRA VALUE  INDEX--contains  stocks of the S&P
SmallCap 600 Index which have a lower than average price-to-book ratio.

STANDARD & POOR'S SMALLCAP  600/BARRA GROWTH  INDEX--contains  stocks of the S&P
SmallCap 600 Index which have a higher than average price-to-book ratio.

RUSSELL  1000  VALUE  INDEX--consists  of the stocks in the  Russell  1000 Index
(comprising  the 1,000  largest  U.S.-based  companies  measured by total market
capitalization)  with the lowest  price-to-book  ratios,  comprising  50% of the
market capitalization of the Russell 1000.

WILSHIRE  5000  EQUITY   INDEX--consists   of  more  than  7,000  common  equity
securities,  covering  all  stocks  in the  U.S.  for  which  daily  pricing  is
available.

WILSHIRE 4500 EQUITY  INDEX--consists  of all stocks in the Wilshire 5000 except
for the 500 stocks in the Standard & 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, Asia, and the Far East.

GOLDMAN SACHS 100  CONVERTIBLE  BOND  INDEX--currently  includes 71 bonds and 29
preferreds.   The  original  list  of  names  was  generated  by  screening  for
convertible  issues of $100  million or greater  in market  capitalization.  The
index is priced monthly.

SALOMON BROTHERS GNMA  INDEX--includes  pools of mortgages originated by private
lenders and guaranteed by the mortgage pools of the Government National Mortgage
Association.

SALOMON BROTHERS HIGH-GRADE  CORPORATE BOND  INDEX--consists of publicly issued,
non-convertible  corporate bonds rated Aa or Aaa. It is a value-weighted,  total
return index, including  approximately 800 issues with maturities of 12 years or
greater.

MERRILL LYNCH  CORPORATE & GOVERNMENT  BOND  INDEX--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 one year and with more than $25  million  outstanding.  This  index
includes over 1,500 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 $100 million
principal outstanding and maturity greater than ten years.

BOND BUYER MUNICIPAL BOND INDEX--is a yield index on  current-coupon  high grade
general-obligation municipal bonds.

STANDARD & POOR'S PREFERRED INDEX--is a yield index based upon the average yield
of four high grade, noncallable preferred stock issues.

                                      B-19

<PAGE>

NASDAQ INDUSTRIAL INDEX--is composed of more than 3,000 industrial issues. It is
a  value-weighted  index  calculated  on price  change only and does not include
income.

COMPOSITE  INDEX--70%  Standard  & Poor's  500 Index and 30%  NASDAQ  Industrial
Index.

COMPOSITE  INDEX--65%  Standard  & Poor's  500  Index and 35%  Lehman  Long-Term
Corporate AA or Better Bond Index.

COMPOSITE  INDEX--65%  Lehman Long-Term  Corporate AA or Better Bond Index and a
35% weighting in a blended equity  composite (75% Standard & Poor's/BARRA  Value
Index,  12.5%  Standard  & Poor's  Utilities  Index and 12.5%  Standard & Poor's
Telephone Index).

LEHMAN  LONG-TERM  CORPORATE AA OR BETTER BOND  INDEX--consists  of all publicly
issued,  fixed  rate,  nonconvertible   investment  grade,   dollar-denominated,
SEC-registered corporate debt rated AA or AAA.

LEHMAN  BROTHERS  AGGREGATE BOND INDEX--is a market weighted index that contains
over 4,000 individually priced U.S. Treasury,  agency,  corporate,  and mortgage
pass-through  securities  corporate rated Baa- or better. The Index has a market
value of approximately $5 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
one and five years. The index has a market value of approximately $1.6 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 five and
ten years. The index has a market value of over $800 billion.

LEHMAN  BROTHERS  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 of ten or more years. The index
has a market value of over $1.1 trillion.

LEHMAN BROTHERS MUTUAL FUND SHORT (1-5) INVESTMENT GRADE DEBT INDEX--is a market
weighted index that contains all investment grade corporate debt securities with
maturities of one to five years.  The index has a market value of  approximately
$175 billion.

LEHMAN  BROTHERS  MUTUAL  FUND  SHORT  (1-5) U.S.  TREASURY  INDEX-- is a market
weighted index that contains all U.S. Treasury securities with maturities of one
to five years. The index has a market value of approximately $1.1 trillion.

LEHMAN  BROTHERS  MUTUAL  FUND SHORT  (1-5) U.S.  GOVERNMENT  INDEX--is a market
weighted index that contains all U.S.  Government agency and Treasury securities
with  maturities  of  one to  five  years.  The  index  has a  market  value  of
approximately $1.3 trillion.

LEHMAN BROTHERS MUTUAL FUND INTERMEDIATE (5-10) U.S. TREASURY INDEX--is a market
weighted index that contains all U.S.  Treasury  securities  with  maturities of
five to ten years. The index has a market value of approximately $800 billion.

LEHMAN BROTHERS MUTUAL FUND INTERMEDIATE  (5-10) INVESTMENT GRADE DEBT INDEX--is
a market weighted index that contains all investment  grade debt securities with
maturities of five to ten years.  The index has a market value of  approximately
$225 billion.

LIPPER SMALL  COMPANY  GROWTH FUND  AVERAGE--the  average  performance  of small
company  growth funds as defined by Lipper Inc.  Lipper  defines a small company
growth fund as a fund that by prospectus or in practice  limits its  investments
to  companies  on the  basis  of the  size of the  company.  From  time to time,
Vanguard's  advertisements  may  refer to 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).

                                      B-20

<PAGE>

LIPPER GENERAL EQUITY FUND  AVERAGE--an  industry  benchmark of average  general
equity funds with similar  investment  objectives  and policies,  as measured by
Lipper Inc.

LIPPER FIXED-INCOME FUND AVERAGE--an  industry benchmark of average fixed-income
funds with similar  investment  objectives  and policies,  as measured by Lipper
Inc.

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 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 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 Inc.

FIRST  BOSTON  CONVERTIBLE   SECURITIES   INDEX--Established  as  a  performance
benchmark in 1982, the Index is valued monthly and generally includes 250 to 300
issues of convertible  securities rated B- or better by Standard & Poor's, and a
predominant  proportion of the market  capitalization  of the total value of all
convertible securities.

                                      B-21

<PAGE>

                APPENDIX--DESCRIPTION OF SECURITIES AND RATINGS


Excerpts from Moody's Investors Service, Inc. (Moody's) description of its bond
ratings:

  AAA--Judged  to be the  best  quality.  They  carry  the  smallest  degree  of
investment risk.

  AA--Judged to be of high quality by all standards. Together with the Aaa group
they comprise what are generally known as high grade bonds.

  A--Possess  many favorable  investment  attributes and are to be considered as
"upper medium grade obligations".

  BAA--Considered  as medium grade  obligations,  i.e.,  they are neither highly
protected nor poorly secured.  Interest  payments and principal  security appear
adequate for the present but certain  protective  elements may be lacking or may
be characteristically unreliable over any great length of time.

  BA--Judged to have speculative elements;  their future cannot be considered as
well assured.

  B--Generally lack characteristics of the desirable investment;

  CAA--are  of poor  standing.  Such  issues  may be in  default or there may be
present elements of danger with respect to principal or interest.

  CA--Speculative in a high degree; often in default.

  C--Lowest rated class of bonds; regarded as having extremely poor prospects.

     Moody's also supplies numerical indicators 1, 2 and 3 to rating categories.
The  modifier 1 indicates  that the  security is in the higher end of its rating
category;  the  modifier 2  indicates  a  mid-range  ranking;  and 3 indicates a
ranking toward the lower end of the category.

Excerpts from Standard & Poor's Corporation description of its four highest bond
ratings:

  AAA--Highest grade  obligations.  Capacity to pay interest and repay principal
is extremely strong.

  AA--Also  qualify as high grade  obligations.  A very  strong  capacity to pay
interest and repay principal and differs from AAA issues only in small degree.

  A--Regarded as upper medium grade. They have a strong capacity to pay interest
and repay  principal  although  they are  somewhat  susceptible  to the  adverse
effects of changes in circumstances and economic  conditions than debt in higher
rated categories.

  BBB--Regarded  as  having  an  adequate  capacity  to pay  interest  and repay
principal. Whereas it normally exhibits adequate protection parameters,  adverse
economic  conditions  or  changing  circumstances  are more  likely to lead to a
weakened  capacity to pay interest and repay principal for debt in this category
than in higher rated  categories.  This group is the lowest which  qualifies for
commercial bank investment.

  BB, B, CCC,  CC--Predominately  speculative  with  respect to  capacity to pay
interest and repay  principal in  accordance  with terms of the  obligation.  BB
indicates the lowest degree of speculation and CC the highest.

     S&P applies indicators "+," no character, and "-" to its rating categories.
The indicators show relative standing within the major rating categories.



                                                               SAI082-03/17/2000



                                      B-22
<PAGE>

                                     PART C

                      VANGUARD CONVERTIBLE SECURITIES FUND

                                OTHER INFORMATION

ITEM 23. EXHIBITS

(a)  Declaration of Trust**
(b)  By-Laws**
(c)  Not applicable
(d)  Investment Advisory Contract**
(e)  Not applicable
(f)  Reference is made to the section  entitled  "Management of the Fund" in the
     Registrant's Statement of Additional Information
(g)  Custodian Agreement**
(h)  Amended and Restated Funds' Service Agreement**
(i)  Legal Opinion**
(j)  Consent of Independent Accountants*
(k)  Not Applicable
(l)  Not Applicable
(m)  Not Applicable
(n)  Not Applicable
(o)  Not Applicable

- --------------------
  * Filed herewith
 ** Previously filed

ITEM 24. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT

Registrant is not controlled by or under common control with any person.

ITEM 25. INDEMNIFICATION

The  Registrant's   organizational  documents  contain  provisions  indemnifying
Trustees and officers  against  liability  incurred in their official  capacity.
Article VII,  Section 2 of the Declaration of Trust provides that the Registrant
may  indemnify  and hold  harmless  each and every  Trustee and officer from and
against  any and all  claims,  demands,  costs,  losses,  expenses,  and damages
whatsoever  arising out of or related to the performance of his or her duties as
a Trustee or officer.  However,  this  provision does not cover any liability to
which a Trustee  or  officer  would  otherwise  be  subject by reason of willful
misfeasance,  bad faith,  gross negligence,  or reckless disregard of the duties
involved  in  the  conduct  of  his or her  office.  Article  VI of the  By-Laws
generally provides that the Registrant shall indemnify its Trustees and officers
from  any  liability  arising  out of  their  past or  present  service  in that
capacity.  Among other things,  this provision excludes any liability arising by
reason of willful  misfeasance,  bad faith,  gross  negligence,  or the reckless
disregard  of the duties  involved in the conduct of the  Trustee's or officer's
office with the Registrant.

ITEM 26. BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER

Oaktree Capital Management,  LLC. (Oaktree), is an investment adviser registered
under the  Investment  Advisers Act of 1940, as amended (the Adviser  Act).  The
list required by this Item 26 of officers and partners of Oaktree, together with
any  information  as to any business  profession,  vocation or  employment  of a
substantial  nature engaged in by such officers and partners during the past two
years,  is  incorporated  herein by reference from Schedules B and D of Form ADV
filed by Oaktree pursuant to the Advisers Act (SEC File No. 801-48923).

                                       C-1

                                     <PAGE>

ITEM 27. PRINCIPAL UNDERWRITERS

(a)  Not Applicable
(b)  Not Applicable
(c)  Not Applicable

ITEM 28. LOCATION OF ACCOUNTS AND RECORDS

The books, accounts, and other documents required to be maintained by Section 31
(a) of the Investment  Company Act and the rules promulgated  thereunder will be
maintained  at the  offices of  Registrant;  Registrant's  Transfer  Agent,  The
Vanguard Group, Inc., 100 Vanguard Boulevard,  Malvern,  Pennsylvania 19355; and
the  Registrant's  Custodian,  First Union  National  Bank,  PA4943,  530 Walnut
Street, Philadelphia, Pennsylvania 19109.

ITEM 29. MANAGEMENT SERVICES

Other than as set forth under the description of The Vanguard Group in Part B of
this   Registration   Statement,   the   Registrant   is  not  a  party  to  any
management-related service contract.

ITEM 30. UNDERTAKINGS

Not Applicable

                                       C-2

<PAGE>

                                   SIGNATURES

Pursuant to the  requirements  of the  Securities Act of 1933 and the Investment
Company  Act of  1940,  the  Registrant  hereby  certifies  that  it  meets  all
requirements for effectiveness of this Registration  Statement  pursuant to Rule
485(b) under the  Securities  Act of 1933 and has duly caused this  Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in the Town of Valley Forge and the Commonwealth of Pennsylvania, on
the 25th day of February, 2000.

                                         VANGUARD CONVERTIBLE SECURITIES FUND

                                   BY:__________________________________________
                                                      (signature)
                                                     (HEIDI STAM)
                                                    JOHN J. BRENNAN*
                                         CHAIRMAN AND CHIEF EXECUTIVE OFFICER

     Pursuant  to  the   requirements  of  the  Securities  Act  of  1933,  this
Post-Effective  Amendment to the Registration Statement has been signed below by
the following persons in the capacities and on the date indicated:


SIGNATURE                     TITLE                           DATE
- --------------------------------------------------------------------------------

By:/S/ JOHN J. BRENNAN        President, Chairman, Chief      February 25, 2000
   ---------------------------  Executive Officer, and Trustee
       (Heidi Stam)
      John J. Brennan*

By:/S/ JOANN HEFFERNAN HEISEN Trustee                         February 25, 2000
   ---------------------------
       (Heidi Stam)
     JoAnn Heffernan Heisen*

By:/S/ BRUCE K. MACLAURY      Trustee                         February 25, 2000
   ---------------------------
       (Heidi Stam)
      Bruce K. MacLaury*

By:/S/ BURTON G. MALKIEL      Trustee                         February 25, 2000
   ---------------------------
       (Heidi Stam)
       Burton G. Malkiel*

By:/S/ ALFRED M. RANKIN, JR.  Trustee                         February 25, 2000
   ---------------------------
       (Heidi Stam)
     Alfred M. Rankin, Jr.*

By:/S/ JOHN C. SAWHILL        Trustee                         February 25, 2000
   ---------------------------
       (Heidi Stam)
      John C. Sawhill*

By:/S/ JAMES O. WELCH, JR.    Trustee                         February 25, 2000
   ---------------------------
       (Heidi Stam)
     James O. Welch, Jr.*

By:/S/ J. LAWRENCE WILSON     Trustee                         February 25, 2000
   ---------------------------
       (Heidi Stam)
     J. Lawrence Wilson*

By:/S/ THOMAS J. HIGGINS      Treasurer and Principal         February 25, 2000
   ---------------------------  Financial Officer and
       (Heidi Stam)             Principal Accounting Officer
      Thomas J. Higgins*


*By Power of  Attorney.  See File Number  33-4424,  filed on January  25,  1999.
 Incorporated by Reference.

<PAGE>

                                 EXHIBIT INDEX

Consent of Independent Accountants .....................................Ex-99.BJ




                                                                   Exhibit-99.BJ

                       CONSENT OF INDEPENDENT ACCOUNTANTS

We hereby  consent to the  incorporation  by reference in the  Prospectuses  and
Statement of Additional  Information  constituting parts of this  Post-Effective
Amendment No. 21 to the  registration  statement on Form N-1A (the  Registration
Statement)  of our  report  dated  January 6, 2000,  relating  to the  financial
statements  and  financial  highlights  appearing  in the 1999 Annual  Report to
Shareholders  of  Vanguard   Convertible   Securities   Fund,   which  are  also
incorporated by reference into the  Registration  Statement.  We also consent to
the  references  to  us  under  the  heading   "Financial   Highlights"  in  the
Prospectuses  and  under  the  headings  "Financial   Statements"  and  "Service
Providers--Independent Accountants" in the Statement of Additional Information.

PricewaterhouseCoopers LLP
Philadelphia, PA

February 24, 2000




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