VANGUARD CONVERTIBLE SECURITIES FUND INC
485APOS, 2001-01-16
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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. 22


                                      AND

        REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940


                                AMENDMENT NO. 25



                      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


                 APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING:

  AS SOON AS PRACTICABLE AFTER THIS REGISTRATION STATEMENT BECOMES EFFECTIVE.


               IT IS PROPOSED THAT THIS FILING BECOME EFFECTIVE:

           ON MARCH 19, 2001, PURSUANT TO PARAGRAPH (B) OF RULE 485.


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VANGUARD CONVERTIBLE SECURITIES FUND

INVESTOR SHARES

MARCH 19, 2001



This prospectus
contains financial data
for the Fund through
the fiscal year ended
November 30, 2000.



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.


[A MEMBER OF
THE VANGUARD GROUP(R) LOGO]

<PAGE>

VANGUARD CONVERTIBLE SECURITIES FUND

PROSPECTUS

March 19, 2001

--------------------------------------------------------------------------------
CONTENTS

  1 FUND PROFILE

  4 ADDITIONAL INFORMATION

  4 MORE ON THE FUND

  11 THE FUND AND VANGUARD

  11 INVESTMENT ADVISER

  12 DIVIDENDS, CAPITAL GAINS, AND TAXES

  14 SHARE PRICE

  14 FINANCIAL HIGHLIGHTS

  16 INVESTING WITH VANGUARD

   16 Buying Shares

   17 Redeeming Shares

   19 Other Rules You Should Know

   21 Fund and Account Updates

   22 Contacting Vanguard

 GLOSSARY (inside back cover)
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
 WHY READING THIS PROSPECTUS IS IMPORTANT
 This prospectus explains the investment objective, policies, strategies, and
 risks associated with the 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 decide whether the Fund is the
 right investment for you. We suggest that you keep this prospectus for future
 reference.
-------------------------------------------------------------------------------

<PAGE>


                                                                               1

FUND PROFILE

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 or
common stock attached.  Convertible  securities tend to have credit ratings that
are below investment-grade.


PRIMARY RISKS
An investment in the Fund could lose money over short or even long periods.  You
should expect the Fund's share price and total return to fluctuate within a wide
range like the overall stock market. The Fund's performance could be hurt by:

o    Credit risk,  which is the chance that a convertible  security  issuer will
     fail to pay  interest  or  dividends  and  principal  in a  timely  manner.
     Companies  that issue  convertible  securities  are usually small to medium
     size,  and they often  have low credit  ratings.  In  addition,  the credit
     rating of a company's  convertible  securities is generally lower than that
     of its conventional debt securities.  Convertibles 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.  Credit  risk  should be high for the Fund,  because it invests
     mainly in securities with low credit quality.
o    Interest  rate  risk,  which  is the  chance  that  prices  of  convertible
     securities will decline along with overall bond prices,  over short or even
     long periods,  because of rising interest rates. Convertible securities are
     particularly  sensitive to interest  rate changes when their  predetermined
     conversion price is much higher than the issuing company's common stock.
o    Manager risk,  which is the chance that poor security  selection will cause
     the Fund to underperform other funds with similar investment objectives.
o    Sector  risk,  which is the chance  that the Fund's  returns  could be hurt
     significantly by problems  affecting a particular  economic sector.  With a
     substantial   portion  of  the  convertible   securities  market  currently
     concentrated  in  certain   economic   sectors--such   as  the  technology,
     telecommunications,  and media  sectors--sector  risk is quite high for the
     Fund. Historically,  securities in these sectors have been more volatile in
     price than  securities in other economic  sectors,  although the sectors in
     the convertible market do shift over time.

PERFORMANCE/RISK INFORMATION
The  following  bar  chart is  intended  to help  you  understand  the  risks of
investing in the Fund. It shows how the Fund's  performance  has varied from one
calendar year to another over the past ten years. In addition,  there is a table
that shows how the Fund's average  annual total returns  compare with those of a
broad-based  securities market index over set periods of time. Keep in mind that
the Fund's past performance does not indicate how it will perform in the future.

<PAGE>

2

      -----------------------------------------------------
                       ANNUAL TOTAL RETURNS
      -----------------------------------------------------
      [SCALE]
                       1991           %
                       1992           %
                       1993           %
                       1994           %
                       1995           %
                       1996           %
                       1997           %
                       1998           %
                       1999           %
                       2000           %
      -----------------------------------------------------

     During the period shown in the bar chart, the highest return for a calendar
quarter  was .%  (quarter  ended .), and the lowest  return for a quarter was .%
(quarter ended .).


      --------------------------------------------------------------------------
          AVERAGE ANNUAL TOTAL RETURNS FOR YEARS ENDED DECEMBER 31, 2000
      --------------------------------------------------------------------------
                                                    1 YEAR  5 YEARS    10 YEARS
      --------------------------------------------------------------------------
      Vanguard Convertible Securities Fund            .%        .%         .%
      CS First Boston Convertible Securities Index    .         .          .
      Average Convertible Securities Fund*            .         .          .
      --------------------------------------------------------------------------
      *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 on those incurred in the fiscal year ended November 30, 2000.

      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:                                                X.XX%
      12b-1 Distribution Fee:                                             None*
      Other Expenses:                                                     X.XX%
       TOTAL ANNUAL FUND OPERATING EXPENSES:                              X.XX%
      * A $5 fee applies to wire redemptions under $5,000.

<PAGE>


                                                                               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
2000 was .%, or $. per $1,000 of average  net assets.  The  average  convertible
securities  mutual fund had  expenses in 2000 of .%, or $. 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 the given period.

-------------------------------------------------
   1 YEAR      3 YEARS    5 YEARS      10 YEARS
-------------------------------------------------
    $XX          $XX        $XX         $XX
-------------------------------------------------

     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
                              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

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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
March, June, September, and December;            custodial 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, 2000               TICKER SYMBOL
NETASSETS                                        VCVSX

SUITABLE FOR IRAS
Yes
--------------------------------------------------------------------------------


MORE ON THE FUND

This  prospectus  describes  risks you would face as a Fund  shareholder.  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 any mutual  fund,  you should take into account your
personal  tolerance for daily fluctuations in the securities  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  Fund
shareholder.

     The  following  sections  explain the  primary  investment  strategies  and
policies  that the Fund uses in pursuit of its  objective.  The Fund's  board of
trustees, which oversees the Fund's management, may change investment strategies
or policies in the interest of  shareholders  without a shareholder  vote unless
those  strategies or policies are designated as  fundamental.  In addition,  you
will find information on other important features of the Fund.


MARKET EXPOSURE

Normally, the Fund invests 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 amount of stock at a predetermined  price)
or common stock attached. The remainder of the Fund's assets will be invested in
non-convertible  corporate or U.S.  government  bonds,  common stocks,  or money
market instruments.

     Because it invests mainly in convertible securities, the Fund is subject to
certain risks that other investment strategies may not be subject to.

<PAGE>

                                                                               5

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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.
--------------------------------------------------------------------------------

     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  more  like the  common  stock.  In such a case,  the
convertible security's price may be as volatile as that of the common stocks.

[FLAG] PRICES OF THE FUND'S  CONVERTIBLE  HOLDINGS MAY  FLUCTUATE IN RESPONSE TO
     PRICE  CHANGES IN THE  UNDERLYING  COMMON  STOCKS.  THEREFORE,  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.

     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                  *%          *%        *%        *%
Worst                 *            *         *        *
Average               *            *         *        *
----------------------------------------------------------

     The table  covers all of the 1-, 5-,  10-,  and 20-year  periods  from 1926
through 2000. You can see, for example,  that while the average return on common
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 2000).  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 the Fund in particular.

<PAGE>

6

     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.


--------------------------------------------------------------------------------
                                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 of
comparable   quality  and   maturity   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 probably 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.
--------------------------------------------------------------------------------

     Although  bonds are often thought to be less risky than stocks,  there have
been periods when bond prices have fallen  significantly  due to rising interest
rates.  For  instance,  prices of  long-term  bonds fell by almost  48%  between
December 1976 and September 1981.

     To illustrate the relationship  between bond prices and interest rates, the
following  table shows the effect of 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   AFTER A   AFTER A     AFTER A
                                 1%        1%        2%          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
----------------------------------------------------------------------

     These figures are for  illustration  only; you should not regard them as an
indication  of  future  returns  from the bond  market as a whole or the Fund in
particular.

<PAGE>

                                                                               7


--------------------------------------------------------------------------------
                               PLAIN TALK ABOUT
                         CONVERTIBLE SECURITIES MARKET
While all  markets  are prone to change over time,  the  generally  high rate at
which convertible  securities are retired (through  conversion,  redemption,  or
maturity)  and  replaced  with newly issued  convertibles  causes this market to
change more rapidly than  others.  Changes in the past few years in  particular,
have   increased  the  risk  profile  of   convertible   securities.   First,  a
disproportionate  amount  of new  convertibles  have  been  in  the  technology,
telecommunications,   and  media  sectors.   This   concentration  of  available
securities has elevated above historic levels the sensitivity of the convertible
securities  market to the volatility of the equity markets and the special risks
of those sectors.  Second,  the recent  proliferation of convertible  securities
with  innovative  structures,  such  as  mandatory  conversion  securities,  and
equity-linked securities, has increased the sensitivity of this market to equity
market  volatility  and the special  risks of those  innovations.  Third,  while
convertible  securities have  historically  maintained lower credit quality than
other  fixed  income  securities,   convertibles  have  recently  experienced  a
substantial  decline  in credit  quality.  Many  convertibles  are  rated  below
investment grade or are not rated,  and therefore may be considered  speculative
investments.
--------------------------------------------------------------------------------

[FLAG] THE FUND IS SUBJECT TO SECTOR RISK, WHICH IS THE CHANCE THAT RETURNS FROM
     THE ECONOMIC  SECTORS IN WHICH  CONVERTIBLE  SECURITIES ARE  CONCENTRATED--
     CURRENTLY THE TECHNOLOGY, TELECOMMUNICATIONS, AND MEDIA SECTORS--WILL TRAIL
     RETURNS FROM OTHER ECONOMIC SECTORS.  AS A GROUP,  THESE SECTORS TEND TO GO
     THOUGH CYCLES OF DOING BETTER - OR WORSE - THAN THE CONVERTIBLES  MARKET IN
     GENERAL.  THESE PERIODS  HAVE,  IN THE PAST,  LASTED FOR AS LONG AS SEVERAL
     YEARS. SECTOR RISK IS QUITE HIGH FOR THE FUND.

     Securities with innovative structures have become increasingly prevalent in
the  convertible   securities  market.  These  include  "mandatory   conversion"
securities,  which consist of debt  securities or preferred  stocks that convert
automatically  into equity  securities  of the same or a  different  issuer at a
specified date and conversion ratio.  Mandatory conversion  securities may offer
limited potential for capital  appreciation and, in some instances,  are subject
to complete loss of invested  capital.  Other  innovative  convertibles  include
"equity-linked"  securities,  which are securities or derivatives  that may have
fixed,  variable, or no interest payments prior to maturity, may convert (at the
option of the holder or on a mandatory  basis) into any cash or a combination of
cash and equity  securities,  and may be  structured  to limit the potential for
capital appreciation.  Equity-linked securities may be illiquid and difficult to
value and may be subject to greater credit risk than other convertibles.

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

<PAGE>


8
--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                 CREDIT QUALITY
A bond's credit quality  depends on the issuer's  ability to pay interest on the
bond and,  ultimately,  to repay the  debt.  The lower the  rating by one of the
independent  bond-rating  agencies (for example,  Moody's or Standard & Poor's),
the greater the chance--in  the rating  agency's  opinion--that  the bond issuer
will default, or fail to meet its payment  obligations.  All things being equal,
the lower a bond's credit  rating,  the higher its yield should be to compensate
investors for assuming a higher risk of payment  default.  Bonds rated in one of
the four highest rating categories are considered "investment grade."
--------------------------------------------------------------------------------

     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 of the company's  conventional  debt securities,
since convertibles 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,  Inc.  or B, BB, or BBB by  Standard  and
Poor's Rating Group, a division of the McGraw-Hill  Companies,  Inc.  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.

[FLAG] BONDS RATED LESS THAN BAA BY MOODY'S OR BBB BY STANDARD & POOR'S, SUCH AS
     THOSE HELD BY THE FUND, ARE CLASSIFIED AS NON-INVESTMENT GRADE. THESE BONDS
     CARRY A HIGH  DEGREE OF RISK AND ARE  CONSIDERED  SPECULATIVE  BY THE MAJOR
     RATING AGENCIES.

     As of November 30, 2000, the Fund's convertible securities holdings had the
following credit quality characteristics:

--------------------------------------------------------------------------------
INVESTMENT*                                        PERCENT OF FUND'S NET ASSETS
--------------------------------------------------------------------------------
AAA/Aaa                                                            .%
AA/Aa                                                              .%
A/A                                                                .%
BBB/Baa                                                            .%
BB/Ba                                                              .%
B/B                                                                .%
CCC/Ccc                                                            .%
CC/Ca                                                              .%
C/C                                                                .%
Nonrated Securities                                                .%
*Excludes common and preferred stocks and derivatives,  which are not subject to
ratings categorization.
--------------------------------------------------------------------------------

<PAGE>


                                                                               9

SECURITY SELECTION
Oaktree  Capital  Management,  LLC, a registered  investment  adviser  under the
Investment Advisers Act of 1940, as amended,  (Oaktree),  acts as the investment
adviser to the Fund and will generally select 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 the
adviser's  opinion,  be priced at a reasonable  premium relative to the price at
which it can be  converted  into common  stock.  Oaktree will  generally  sell a
convertible  security when the  underlying  stock price  exceeds the  conversion
price by a reasonable margin. When a convertible  security reaches this level it
may be considered an equity substitute.

     The Fund is generally managed without regard to tax ramifications.

[FLAG] THE FUND IS SUBJECT TO MANAGER RISK, WHICH IS THE CHANCE THAT THE ADVISER
     WILL DO A POOR JOB OF SELECTING SECURITIES.


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 is authorized to 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. As a result,
the  Fund is  subject  to  country  risk,  which  is the  chance  that  domestic
events--such  as  political   upheaval,   financial   troubles,   or  a  natural
disaster--will weaken a country's securities markets.

     The Fund may also invest 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.  The Fund will not use futures for  speculative  purposes or as  leveraged
investments  that magnify gains or losses.  The Fund's  obligation under futures
contracts will not exceed 20% of its total assets.
     The reasons for which the Fund will invest in futures and options are:
o    To keep cash on hand to meet shareholder redemption requests or other needs
     while simulating full investment in stocks.
o    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  investments--in  response  to
extraordinary market, economic, political, or other conditions. In doing so, the
Fund may  succeed in  avoiding  losses  but  otherwise  may fail to achieve  its
investment objective.

<PAGE>


10

--------------------------------------------------------------------------------
                                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).  Some forms
of  derivatives,  such as  exchange-traded  futures and  options on  securities,
commodities,  or indexes, have been trading on regulated exchanges for more than
two decades.  These types of  derivatives  are  standardized  contracts that can
easily be bought and sold,  and whose market values are determined and published
daily.  Non-standardized  derivatives,  on  the  other  hand,  tend  to be  more
specialized or complex,  and may be harder to value.  If used for speculation or
as  leveraged  investments,  derivatives  can carry  considerable  risks for the
investor. Although the Fund does not currently invest in such securities, it may
in the future.
--------------------------------------------------------------------------------


COSTS AND MARKET-TIMING
Some  investors  try to profit from a strategy  called  market-timing--switching
money into  mutual  funds when they expect  prices to rise and taking  money out
when they expect  prices 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.
This is why all  Vanguard  funds have  adopted  special  policies to  discourage
short-term trading. Specifically:
o    Each   Vanguard   fund   reserves   the  right  to  reject   any   purchase
     request--including  exchanges from other Vanguard funds--that it regards as
     disruptive to efficient portfolio  management.  A purchase request could be
     rejected because of the timing of the investment or because of a history of
     excessive trading by the investor.
o    Each  Vanguard  fund (except the money market  funds)  limits the number of
     times that an investor can exchange into and out of the fund.
o    Each Vanguard fund reserves the right to stop offering shares at any time.
o    Vanguard  U.S.  Stock Index Funds,  International  Stock Index Funds,  REIT
     Index Fund,  Balanced  Index Fund,  and Growth and Income Fund generally do
     NOT accept  exchanges  by  telephone  or fax,  or  online.  (IRAs and other
     retirement accounts are not subject to this rule.)
o    Certain   Vanguard  funds  charge   transaction  fees  on  purchase  and/or
     redemptions of their shares.
o    Vanguard funds that hold foreign  securities may value those  securities at
     their "fair value,"  rather than the price at which those  securities  last
     traded on their primary foreign markets or exchanges,  to take into account
     events that occur after the close of those markets or exchanges.

See the INVESTING WITH VANGUARD  section of this  prospectus for further details
on Vanguard's transaction policies.

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

TURNOVER RATE
Although  the Fund  normally  seeks to  invest  for the long  term,  it may sell
securities  regardless of how long they have been held. The FINANCIAL HIGHLIGHTS
section  of this  prospectus  shows  historic  turnover  rates for the  Fund.  A
turnover  rate of  100%,  for  example,  would  mean  that the Fund had sold and
replaced securities valued at 100% of its net assets within a one-year period.

<PAGE>


                                                                              11

--------------------------------------------------------------------------------
                               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 taxable
income.  As of November 30, 2000, the average  turnover rate for all convertible
securities funds was approximately *%, according to Morningstar, Inc.
--------------------------------------------------------------------------------


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 $550 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.
--------------------------------------------------------------------------------


INVESTMENT ADVISER
Oaktree Capital Management,  LLC (Oaktree),  333 South Grand Avenue, 28th Floor,
Los Angeles,  CA 90071,  adviser to the Fund,  is an  investment  advisory  firm
founded  in 1995.  Oaktree  focuses  on certain  specialized  investment  areas,
including convertible securities. As of November 30, 2000, Oaktree managed about
$* in assets.  The firm  manages the Fund subject to the control of the trustees
and officers of the Fund.

     Oaktree's  advisory fee is paid  quarterly,  and is based on certain annual
percentage  rates  applied  to the  Fund's  average  month-end  assets  for each
quarter.  In addition,  Oaktree's  advisory  fee may be increased or  decreased,
based on the cumulative total return of the Fund over a trailing 36-month period
as compared with the  cumulative  total return of the Credit Suisse First Boston
Convertible  Securities  Index over the same period.  Please  consult the Fund's
Statement of Additional  Information for a complete  explanation of how advisory
fees are calculated.

     For the fiscal year ended November 30, 2000,  the advisory fee  represented
an effective annual rate of 0.XX% of the Fund's average net assets  [PERFORMANCE
INCREASE/DECREASE].

<PAGE>


12

     The adviser is authorized to choose  broker-dealers  to handle the purchase
and sale of the Fund's  securities,  and to obtain the best available  price and
most  favorable  execution for all  transactions.  Also, the Fund may direct the
adviser to use a  particular  broker for certain  transactions  in exchange  for
commission rebates or research services provided to the Fund.

     In the interest of obtaining better execution of a transaction, the adviser
may at times  choose  brokers who charge  higher  commissions.  If more than one
broker can obtain the best available  price and most favorable  execution,  then
the adviser is  authorized  to choose a broker who, in addition to executing the
transaction, will provide research services to the adviser or 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
The manager primarily responsible for overseeing the Fund's investments is:

LARRY W. KEELE,  Principal and a founder of Oaktree Capital  Management,  LLC in
1995. He has worked in investment  management since 1981; has managed  portfolio
investments  since 1983; and has managed the Fund since 1995.  Education:  B.A.,
Tennessee Tech University; M.B.A. in Finance, University of South Carolina.
--------------------------------------------------------------------------------

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 to purchase more shares of
the Fund.

<PAGE>


                                                                              13


--------------------------------------------------------------------------------
                               PLAIN TALK ABOUT
                                 DISTRIBUTIONS
As a  shareholder,  you are entitled to your  portion 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 any stock
holdings  and  the  interest  it  receives   from  any  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:
o    Distributions are taxable to you for federal income tax purposes whether or
     not you reinvest these amounts to purchase additional Fund shares.
o    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.
o    Any  dividend  and  capital  gains that you  receive  are taxable to you as
     ordinary income for federal income tax purposes.
o    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.
o    Capital gains  distributions  may vary  considerably from year to year as a
     result of the Fund's normal investment activities and cash flows.
o    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.
o    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:
o    provide us with your correct taxpayer identification number;
o    certify that the taxpayer identification number is correct; and
o    confirm that you are not subject to backup withholding.
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  to purchase  additional  Fund share for your
account 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.

<PAGE>

                                                                              14

Please  consult your tax adviser for detailed  information  about the 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),  you  should  avoid  buying  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 dividing the net assets of the
Fund by the number of Fund shares outstanding as of the calculation date.

     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."


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 for
the Fund, 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.

<PAGE>


                                                                              15

--------------------------------------------------------------------------------
                                        VANGUARD CONVERTIBLE SECURITIES FUND
                                           YEAR ENDED NOVEEMBER 30,
--------------------------------------------------------------------------------
                          2000       1999         1998        1997        1996
--------------------------------------------------------------------------------
NET ASSET VALUE,        $13.18     $11.10       $13.01      $13.07      $12.03
 BEGINNING OF YEAR
--------------------------------------------------------------------------------
INVESTMENT OPERATIONS
 Net Investment Income                .52          .52         .53         .43
 Net Realized and
  Unrealized Gain (Loss)             2.13         (.77)       1.17        1.29
  on Investments
--------------------------------------------------------------------------------
 Total from Investment
  Operations                         2.65         (.25)       1.70        1.72
--------------------------------------------------------------------------------
DISTRIBUTIONS
 Dividends from Net
  Investment Income                  (.57)        (.54)       (.47)       (.54)
 Distributions from
  Realized Capital                      -        (1.12)      (1.29)       (.14)
  Gains
--------------------------------------------------------------------------------
  Total Distributions                (.57)       (1.66)      (1.76)       (.68)
--------------------------------------------------------------------------------
NET ASSET VALUE, END               $13.18       $11.10      $13.01      $13.07
 OF YEAR
================================================================================
TOTAL RETURN                        24.85%       -2.16%      14.81%      14.88%
================================================================================

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


--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                   HOW TO READ THE FINANCIAL HIGHLIGHTS TABLE
The Fund began  fiscal 2000 with a net asset value  (price) of $13.18 per share.
During  the  year,  the Fund  earned  $0.XX  per share  from  investment  income
(interest  and  dividends)  and  $0.XX  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.XX 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  ($X.XX  per  share)  minus the  distributions  ($0.XX  per share)
resulted in a share price of $XX.XX at the end of the year. This was an increase
of $0.XX per share (from  $13.18 at the  beginning  of the year to $XX.XX 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 XX.XX% for the year.

As of November 30, 2000,  the Fund had $XX billion in net assets.  For the year,
its  expense  ratio was 0.XX%  ($X.X0  per  $1,000 of net  assets);  and its net
investment  income  amounted to 0.XX% of its  average  net  assets.  It sold and
replaced securities valued at XX% of its net assets.
--------------------------------------------------------------------------------

<PAGE>


16

--------------------------------------------------------------------------------
INVESTING WITH VANGUARD
This  section  of the  prospectus  explains  the basics of doing  business  with
Vanguard. A special booklet, The Vanguard Service Directory, provides details of
our many shareholder services for individual investors.  A separate booklet, The
Compass,  does the same for  institutional  investors.  You can  request  either
booklet  by  calling  or  writing  Vanguard,   using  the  Contacting   Vanguard
instructions found at the end of this section.

                                 BUYING SHARES
                               REDEEMING SHARES
                          OTHER RULES YOU SHOULD KNOW
                           FUND AND ACCOUNT UPDATES
                              CONTACTING VANGUARD
--------------------------------------------------------------------------------

BUYING SHARES

ACCOUNT MINIMUMS
TO OPEN AND MAINTAIN AN ACCOUNT: IWV MININVEST for regular accounts;  $1,000 for
IRAs and custodial accounts for minors.
TO ADD TO AN EXISTING ACCOUNT: $100 by mail or exchange; $1,000 by wire.

HOW TO BUY SHARES
BY CHECK: Mail your check and a completed account registration form to Vanguard.
When adding to an existing account,  send your check with an Invest-By-Mail form
detached  from your last  account  statement.  Make the check  payable  to:  The
Vanguard Group-82. For addresses, see Contacting Vanguard.
BY EXCHANGE PURCHASE:  You can purchase shares with the proceeds of a redemption
from another  Vanguard fund. All open Vanguard funds permit  exchange  purchases
requested in writing.  MOST  VANGUARD  FUNDS--OTHER  THAN THE STOCK AND BALANCED
INDEX-ORIENTED  FUNDS--ALSO  ACCEPT EXCHANGE  PURCHASES  REQUESTED  ONLINE OR BY
TELEPHONE. See Other Rules You Should Know for specifics.
BY WIRE: Call Vanguard to purchase shares by wire. See Contacting Vanguard.

YOUR PURCHASE PRICE
You buy  shares at a fund's  next-determined  NAV after  Vanguard  accepts  your
purchase  request.  As long as your  request  is  received  before  the close of
regular trading on the New York Stock Exchange (generally 4 p.m., Eastern time),
you will buy your shares at that day's NAV. This is known as your TRADE DATE.

PURCHASE RULES YOU SHOULD KNOW
* THIRD PARTY CHECKS.  To protect the funds from check fraud,  Vanguard will not
accept checks made payable to third parties.

<PAGE>

                                                                              17

* U.S.  CHECKS  ONLY.  All purchase  checks must be written in U.S.  dollars and
drawn on a U.S. bank.
* LARGE  PURCHASES.  Vanguard  reserves the right to reject any purchase request
that may  disrupt  a fund's  operation  or  performance.  Please  call us before
attempting to invest a large dollar amount.
* NO CANCELLATIONS. Place your transaction requests carefully. Vanguard will NOT
cancel any transaction once it has been initiated and a confirmation  number has
been assigned (if applicable).
* FUTURE PURCHASES.  All Vanguard funds reserve the right to stop selling shares
at any time, or to reject specific  purchase  requests,  including  purchases by
exchange from another Vanguard fund.


REDEEMING SHARES

HOW TO REDEEM SHARES
Be sure to check Other Rules You Should Know before initiating your request.
ONLINE: Request a redemption through our website at Vanguard.com.
BY  TELEPHONE:  Contact  Vanguard  by  telephone  to request a  redemption.  For
telephone numbers, see Contacting Vanguard.
BY MAIL: Send your written redemption  instructions to Vanguard.  For addresses,
see Contacting Vanguard.

YOUR REDEMPTION PRICE
You redeem shares at a fund's  next-determined  NAV after Vanguard  accepts your
redemption  request,  including  any special  documentation  required  under the
circumstances.  As long as your request is received  before the close of regular
trading on the New York Stock Exchange  (generally 4 p.m.,  Eastern time),  your
shares are redeemed at that day's NAV. This is known as your TRADE DATE.


TYPES OF REDEMPTIONS
* CHECK  REDEMPTIONS.  Unless  instructed  otherwise,  Vanguard  will mail you a
check, normally within two business days of your trade date.
* EXCHANGE REDEMPTIONS.  You may instruct Vanguard to apply the proceeds of your
redemption to purchase shares of another  Vanguard fund. All open Vanguard funds
accept exchange  redemptions  requested in writing.  Most Vanguard  funds--other
than  the  stock  and  balanced   index-oriented   funds--also  accept  exchange
redemptions  requested  online or by telephone.  See Other Rules You Should Know
for specifics.
* WIRE  REDEMPTIONS.  When redeeming from a money market fund, bond fund, or the
Preferrred Stock Fund, you

<PAGE>

18

may  instruct  Vanguard  to  wire  your  redemption  proceeds  to  a  previously
designated bank account. Wire redemptions are not available for Vanguard's other
funds.  The wire  redemption  option is not automatic;  you must establish it by
completing  a  special  form  or  the   appropriate   section  of  your  account
registration.  Also,  wire  redemptions  must  be  requested  in  writing  or by
telephone, not online. A $5 fee applies to wire redemptions under $5,000.
Money Market Funds: For telephone  requests  accepted at Vanguard by 10:45 a.m.,
Eastern time, the  redemption  proceeds will arrive at your bank by the close of
business that same day. For other requests accepted before 4 p.m., Eastern time,
the redemption proceeds will arrive at your bank by the close of business on the
following business day.
Bond Funds and  Preferred  Stock Fund:  For  requests  accepted at Vanguard by 4
p.m.,  Eastern  time,  the  redemption  proceeds will arrive at your bank by the
close of business on the following business day.

REDEMPTION RULES YOU SHOULD KNOW
* SPECIAL ACCOUNTS. Special documentation may be required to redeem from certain
types of accounts, such as trust, corporate,  nonprofit, or retirement accounts.
Please call us before attempting to redeem from these types of accounts.
* POTENTIALLY DISRUPTIVE REDEMPTIONS.  Vanguard reserves the right to pay all or
part of your  redemption  in-kind--that  is,  in the form of  securities--if  we
believe  that  a  cash  redemption   would  disrupt  the  fund's   operation  or
performance.  Under these  circumstances,  Vanguard  also  reserves the right to
delay  payment of your  redemption  proceeds for up to seven days. By calling us
before you attempt to redeem a large dollar amount, you are more likely to avoid
in-kind or delayed payment of your redemption.
* RECENTLY PURCHASED SHARES.  While you can redeem shares at any time,  proceeds
will not be made  available  to you until  the Fund  collects  payment  for your
purchase. This may take up to ten calendar days for shares purchased by check or
Vanguard Fund Express(R).
* SHARE  CERTIFICATES.  If share certificates have been issued for your account,
those shares cannot be redeemed until you return the certificates  (unsigned) to
Vanguard by registered mail. For the correct address, see Contacting Vanguard.
* PAYMENT TO A DIFFERENT  PERSON OR ADDRESS.  We can make your redemption  check
payable to a different person or send it to a different address.  However,  this
requires the written  consent of all registered  account  owners,  which must be
provided under signature  guarantees.  You can obtain a signature guarantee from
most commercial and savings

<PAGE>


                                                                              19

banks, credit unions, trust companies, or member firms of a U.S. stock exchange.
* NO CANCELLATIONS. Place your transaction requests carefully. Vanguard will NOT
cancel any transaction once it has been initiated and a confirmation  number has
been assigned (if applicable).
* EMERGENCY  CIRCUMSTANCES.  Vanguard  funds can postpone  payment of redemption
proceeds for up to seven calendar days at any time. In addition,  Vanguard funds
can suspend redemptions and/or postpone payments of redemption proceeds at times
when the New York Stock Exchange is closed or during emergency circumstances, as
determined by the U.S. Securities and Exchange Commission.


OTHER RULES YOU SHOULD KNOW

TELEPHONE TRANSACTIONS
* AUTOMATIC.  In setting up your account,  we'll automatically  enable you to do
business  with us by regular  telephone,  unless you  instruct us  otherwise  in
writing.
* TELE-ACCOUNT(TM). To conduct account transactions through Vanguard's automated
telephone service, you must first obtain a personal identification number (PIN).
Call  Tele-Account  to obtain a PIN,  and allow  seven  days  before  using this
service.
* PROOF OF A  CALLER'S  AUTHORITY.  We reserve  the right to refuse a  telephone
request if the caller is unable to provide the following  information exactly as
registered on the account:
o    Ten-digit account number.
o    Complete owner name and address.
o    Primary Social Security or employer identification number.
o    Personal Identification Number (PIN), if applicable.
* SUBJECT TO REVISION.  We reserve the right to revise or  terminate  Vanguard's
telephone transaction service at any time, without notice.
*  SOME  VANGUARD  FUNDS  DO  NOT  PERMIT  TELEPHONE  EXCHANGES.  To  discourage
market-timing,  Vanguard's  Stock  Index  Funds,  Growth  and Income  Fund,  and
Balanced  Index Fund  generally do not permit  telephone  exchanges (in or out),
except for IRAs and certain other retirement accounts.


VANGUARD.COM
*  REGISTRATION.  You can use your  personal  computer  to review  your  account
holdings,  to sell or exchange  shares of most  Vanguard  funds,  and to perform
other transactions. To establish this service, you can register online.
*  SOME  VANGUARD   FUNDS  DO  NOT  PERMIT  ONLINE   EXCHANGES.   To  discourage
market-timing,  Vanguard's  Stock  Index  Funds,  Growth  and Income  Fund,  and
Balanced Index Fund do not

<PAGE>


20

permit  online  exchanges  (in or  out),  except  for  IRAs  and  certain  other
retirement accounts.

WRITTEN INSTRUCTIONS
* "GOOD ORDER" REQUIRED.  We reserve the right to reject any written transaction
instructions  that are not in "good  order."  This means that your  instructions
must include:
o    The fund name and account number.
o    The amount of the transaction (in dollars or shares).
o    Signatures of all owners exactly as registered on the account.
o    Signature guarantees, if required for the type of transaction.*
*For instance,  signature  guarantees must be provided by all registered account
shareholders  when redemption  proceeds are to be sent to a different  person or
address.

RESPONSIBILITY FOR FRAUD
Vanguard will not be responsible for any account losses due to fraud, so long as
we reasonably believe that the person transacting on an account is authorized to
do so. Please take precautions to protect yourself from fraud. Keep your account
information  private and immediately  review any account statements that we send
to you.  Contact Vanguard  immediately  about any transactions you believe to be
unauthorized.

UNCASHED CHECKS
Please cash your distribution or redemption  checks promptly.  Vanguard will not
pay interest on uncashed checks.

LIMITS ON ACCOUNT ACTIVITY
Because  excessive  account  transactions  can disrupt  management of a fund and
increase the fund's costs for all shareholders, Vanguard limits account activity
as follows:
o    You may make no more than TWO SUBSTANTIVE "ROUND TRIPS" THROUGH A NON-MONEY
     MARKET FUND during any 12-month period.
o    Your round trips  through a non-money  market fund must be at least 30 days
     apart.
o    All funds may refuse share purchases at any time, for any reason.
o    Vanguard reserves the right to revise or terminate the exchange  privilege,
     limit the amount of an exchange,  or reject an exchange,  at any time,  for
     any reason.
A "round trip" is a redemption  from a fund followed by a purchase back into the
same  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.

<PAGE>


                                                                              21

UNUSUAL CIRCUMSTANCES
If you experience  difficulty  contacting  Vanguard online, by telephone,  or by
Tele-Account,  you can send us your  transaction  request  by regular or express
mail. See Contacting Vanguard for addresses.

INVESTING WITH VANGUARD THROUGH OTHER FIRMS
You may  purchase  or sell  shares of most  Vanguard  funds  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.


LOW BALANCE ACCOUNTS
All   Vanguard   funds   reserve   the  right  to  close   any   investment-only
retirement-plan  account or any nonretirement  account whose balance falls below
the minimum initial investment.

     Vanguard  deducts a $10 fee in June from each  nonretirement  account whose
balance at that time is below $2,500 ($500 for Vanguard  STAR(TM) Fund). The fee
is waived if your total Vanguard account assets are $50,000 or more.



FUND AND ACCOUNT UPDATES

PORTFOLIO SUMMARIES
We will send you  quarterly  portfolio  summaries to help you keep track of your
accounts  throughout  the year.  Each  summary  shows the  market  value of your
account  at the close of the  statement  period,  as well as all  distributions,
purchases, sales, and exchanges for the current calendar year.

AVERAGE COST REVIEW STATEMENTS
For most taxable  accounts,  average cost review  statements  will accompany the
quarterly portfolio summaries.  These statements show the average cost of shares
that you  redeemed  during the current  calendar  year,  using the average  cost
single category method.

CONFIRMATION STATEMENTS
Each time you buy,  sell,  or  exchange  shares,  we will  send you a  statement
confirming the trade date and amount of your transaction.

TAX STATEMENTS
We will send you annual tax  statements  to assist in preparing  your income tax
returns.  These statements,  which are generally mailed in January,  will report
the previous year's dividend and capital gains distributions,  proceeds from the
sale of shares, and distributions from IRAs or other retirement plans.

REPORTS
You will receive  financial  reports  about your funds twice a year--in June and
December. These comprehensive reports

<PAGE>


22

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  funds'  costs  as low as  possible  (so  that  you and  other
shareholders can keep more of the funds' investment earnings), Vanguard attempts
to eliminate  duplicate  mailings to the same address.  When we find that two or
more  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,  however,  you may  notify our Client
Services Department.


CONTACTING VANGUARD

ONLINE
VANGUARD.COM
o    Your best source of Vanguard news
o    For fund, account, and service information
o    For most account transactions
o    For literature requests
o    24 hours per day, 7 days per week

VANGUARD TELE-ACCOUNT(R) 1-800-662-6273 (ON-BOARD)
o    For automated fund and account information
o    For redemptions by check, exchange, or wire
o    Toll-free, 24 hours per day, 7 days per week

INVESTOR INFORMATION 1-800-662-7447 (SHIP) (Text telephone at 1-800-952-3335)
o    For fund and service information
o    For literature requests
o    Business hours only

CLIENT SERVICES 1-800-662-2739 (CREW) (Text telephone at 1-800-749-7273)
o    For account information
o    For most account transactions
o    Business hours only

INSTITUTIONAL DIVISION 1-888-809-8102
o    For information and services for large institutional investors
o    Business hours only

<PAGE>

                                                                              23

VANGUARD ADDRESSES
REGULAR MAIL (INDIVIDUALS--CURRENT CLIENTS):
The Vanguard Group
P.O. Box 1110
Valley Forge, PA 19482-1110

REGULAR MAIL (INSTITUTIONS):
The Vanguard Group
P.O. Box 2900
Valley Forge, PA 19482-2900

REGULAR MAIL (GENERAL INQUIRIES):
The Vanguard Group
P.O. Box 2600
Valley Forge, PA 19482-2600

REGISTERED OR EXPRESS MAIL:
The Vanguard Group
455 Devon Park Drive
Wayne, PA 19087-1815

FUND NUMBER
Always  use this fund  number  when  contacting  us about  Vanguard  Convertible
Securities Fund-82.

<PAGE>
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<PAGE>
                      (THIS PAGE INTENTIONALLY LEFT BLANK.)

<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 a fund
has sold at a profit, minus any realized losses.

CASH INVESTMENTS
Cash deposits,  short-term  bank  deposits,  and money market  instruments  that
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 a bond's  maturity;  also  known as the par  value or
principal.

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. Bonds rated in one of the four highest rating categories
are considered "investment-grade."

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.

PRICE/EARNINGS (P/E) RATIO
The current share price of a stock, divided by its per-share earnings (profits).
A stock  selling for $20, with  earnings of $2 per share,  has a  price/earnings
ratio of 10.

PRINCIPAL
The amount of money you put into an investment.

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

TOTAL RETURN
A percentage change,  over a specified time period, in a mutual fund's net asset
value,  assuming 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>

[SHIP]
[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.

All market indexes referenced
in this prospectus are the exclusive
property of their respective owners.

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 1-202-942-8090. Reports and
other information about the Fund are
also available on the SEC's Internet
site at http://www.sec.gov, or you
can receive copies of this
information, for a fee, by electronic
request at the following e-mail
address: [email protected], or by
writing the Public Reference
Section, Securities and Exchange
Commission, Washington, DC
20549-0102.

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


(C) 2001 The Vanguard Group, Inc.
All rights reserved.
Vanguard Marketing Corporation,
Distributor.

P082N 032001

<PAGE>

VANGUARD CONVERTIBLE SECURITIES FUND

FOR PARTICIPANTS

MARCH 19, 2001


This prospectus
contains financial data
for the Fund through
the fiscal year ended
November 30, 2000.


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.


[A MEMBER OF
THE VANGUARD GROUP(R) LOGO]

<PAGE>

VANGUARD CONVERTIBLE SECURITIES FUND

PARTICIPANT PROSPECTUS

MARCH 19, 2001

--------------------------------------------------------------------------------
CONTENTS

  1 FUND PROFILE

  2 ADDITIONAL INFORMATION

  2 MORE ON THE FUND

  6 THE FUND AND VANGUARD

  7 INVESTMENT ADVISER

  8 DIVIDENDS, CAPITAL GAINS, AND TAXES

  8 SHARE PRICE

  9 FINANCIAL HIGHLIGHTS

 11 INVESTING WITH VANGUARD

 12 ACCESSING FUND INFORMATION BY COMPUTER

 GLOSSARY (inside back cover)
--------------------------------------------------------------------------------


--------------------------------------------------------------------------------
WHY READING THIS PROSPECTUS IS IMPORTANT
This prospectus explains the investment  objective,  policies,  strategies,  and
risks  associated  with the 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 decide whether the Fund is the right
investment  for you.  We  suggest  that  you keep  this  prospectus  for  future
reference.

     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.
-------------------------------------------------------------------------------

<PAGE>


                                                                               1

FUND PROFILE

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 or --
common stock attached.  Convertible  securities tend to have credit ratings that
are below investment-grade.

PRIMARY RISKS
An investment in the Fund could lose money over short or even long periods.  You
should expect the Fund's share price and total return to fluctuate within a wide
range like the overall stock market. The Fund's performance could be hurt by:
o    Credit risk,  which is the chance that a convertible  security  issuer will
     fail to pay  interest  or  dividends  and  principal  in a  timely  manner.
     Companies  that issue  convertible  securities  are usually small to medium
     size,  and they often  have low credit  ratings.  In  addition,  the credit
     rating of a company's  convertible  securities is generally lower than that
     of its conventional debt securities.  Convertibles 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.  Credit  risk  should be high for the Fund,  because it invests
     mainly in securities with low credit quality.
o    Interest  rate  risk,  which  is the  chance  that  prices  of  convertible
     securities will decline along with overall bond prices,  over short or even
     long periods,  because of rising interest rates. Convertible securities are
     particularly  sensitive to interest  rate changes when their  predetermined
     conversion price is much higher than the issuing company's common stock.
o    Manager risk,  which is the chance that poor security  selection will cause
     the Fund to underperform other funds with similar investment objectives.
o    Sector  risk,  which is the chance  that the Fund's  returns  could be hurt
     significantly by problems  affecting a particular  economic sector.  With a
     substantial   portion  of  the  convertible   securities  market  currently
     concentrated  in  certain   economic   sectors--such   as  the  technology,
     telecommunications,  and media  sectors--sector  risk is quite high for the
     Fund. Historically,  securities in these sectors have been more volatile in
     price than  securities in other economic  sectors,  although the sectors in
     the convetible market do shift over time.


PERFORMANCE/RISK INFORMATION
The  following  bar  chart is  intended  to help  you  understand  the  risks of
investing in the Fund. It shows how the Fund's  performance  has varied from one
calendar year to another over the past ten years. In addition,  there is a table
that shows how the Fund's average  annual total returns  compare with those of a
broad-based  securities market index over set periods of time. Keep in mind that
the Fund's past performance does not indicate how it will perform in the future.

<PAGE>


2

      -----------------------------------------------------
                       ANNUAL TOTAL RETURNS
      -----------------------------------------------------
      [SCALE]
                       1991           %
                       1992           %
                       1993           %
                       1994           %
                       1995           %
                       1996           %
                       1997           %
                       1998           %
                       1999           %
                       2000           %
      -----------------------------------------------------

     During the period shown in the bar chart, the highest return for a calendar
quarter  was .%  (quarter  ended .) and the lowest  return for a quarter  was .%
(quarter ended .).


      --------------------------------------------------------------------------
          AVERAGE ANNUAL TOTAL RETURNS FOR YEARS ENDED DECEMBER 31, 2000
      --------------------------------------------------------------------------
                                                    1 YEAR  5 YEARS    10 YEARS
      --------------------------------------------------------------------------
      Vanguard Convertible Securities Fund            .%        .%         .%
      CS First Boston Convertible Securities Index    .         .          .
      Average Convertible Securities Fund*            .         .          .
      --------------------------------------------------------------------------
      *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 on those incurred in the fiscal year ended November 30, 2000.

      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:                                                X.XX%
      12b-1 Distribution Fee:                                              None
      Other Expenses:                                                     X.XX%
       TOTAL ANNUAL FUND OPERATING EXPENSES:                              X.XX%
      * A $5 fee applies to wire redemptions under $5,000.

<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
2000 was .%, or $. per $1,000 of average  net assets.  The  average  convertible
securities  mutual fund had  expenses in 2000 of .%, or $. 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 the given period.

--------------------------------------------------
   1 YEAR      3 YEARS    5 YEARS      10 YEARS
--------------------------------------------------
    $XX          $XX        $XX         $XX
--------------------------------------------------

     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
                               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, 2000
NETASSETS
--------------------------------------------------------------------------------

MORE ON THE FUND
This  prospectus  describes  risks you would face as a Fund  shareholder.  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 any mutual  fund,  you should take into account your
personal  tolerance for daily fluctuations in the securities  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  Fund
shareholder.

     The  following  sections  explain the  primary  investment  strategies  and
policies  that the Fund uses in pursuit of its  objective.  The Fund's  board of
trustees, which oversees the Fund's management, may change investment strategies
or policies in the interest of  shareholders  without a shareholder  vote unless
those  strategies or policies are designated as  fundamental.  In addition,  you
will find information on other important features of the Fund.


MARKET EXPOSURE
Normally, the Fund invests 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 amount of stock at a predetermined  price)
or common stock attached. The remainder of the Fund's assets will be invested in
non-convertible  corporate or U.S.  government  bonds,  common stocks,  or money
market instruments.

     Because it invests mainly in convertible securities, the Fund is subject to
certain risks that other investment strategies may not be subject to.

<PAGE>

                                                                               5

--------------------------------------------------------------------------------
                                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.
--------------------------------------------------------------------------------

     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  more  like the  common  stock.  In such a case,  the
convertible security's price may be as volatile as that of the common stocks.

[FLAG] PRICES OF THE FUND'S  CONVERTIBLE  HOLDINGS MAY  FLUCTUATE IN RESPONSE TO
     PRICE  CHANGES IN THE  UNDERLYING  COMMON  STOCKS.  THEREFORE,  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.

     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                  *%          *%        *%        *%
Worst                 *            *         *        *
Average               *            *         *        *
----------------------------------------------------------

     The table  covers all of the 1-, 5-,  10-,  and 20-year  periods  from 1926
through 2000. You can see, for example,  that while the average return on common
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 2000).  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 the Fund in particular. 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 charac-

<PAGE>


6

teristics of a bond.  At such times,  the price of the security will move in the
opposite direction of interest rates.

--------------------------------------------------------------------------------
                                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 of
comparable   quality  and   maturity   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 probably 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.
--------------------------------------------------------------------------------

     Although  bonds are often thought to be less risky than stocks,  there have
been periods when bond prices have fallen  significantly  due to rising interest
rates.  For  instance,  prices of  long-term  bonds fell by almost  48%  between
December 1976 and September 1981.

     To illustrate the relationship  between bond prices and interest rates, the
following  table shows the effect of 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   AFTER A   AFTER A     AFTER A
                                 1%        1%        2%          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
----------------------------------------------------------------------

     These figures are for  illustration  only; you should not regard them as an
indication  of  future  returns  from the bond  market as a whole or the Fund in
particular.

<PAGE>


                                                                               7

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                          CONVERTIBLE SECURITIES MARKET
While all  markets  are prone to change over time,  the  generally  high rate at
which convertible  securities are retired (through  conversion,  redemption,  or
maturity)  and  replaced  with newly issued  convertibles  causes this market to
change more rapidly than  others.  Changes in the past few years in  particular,
have   increased  the  risk  profile  of   convertible   securities.   First,  a
disproportionate  amount  of new  convertibles  have  been  in  the  technology,
telecommunications,   and  media  sectors.   This   concentration  of  available
securities has elevated above historic levels the sensitivity of the convertible
securities  market to the volatility of the equity markets and the special risks
of those sectors.  Second,  the recent  proliferation of convertible  securities
with  innovative  structures,  such  as  mandatory  conversion  securities,  and
equity-linked securities, has increased the sensitivity of this market to equity
market  volatility  and the special  risks of those  innovations.  Third,  while
convertible  securities have  historically  maintained lower credit quality than
other  fixed  income  securities,   convertibles  have  recently  experienced  a
substantial  decline  in credit  quality.  Many  convertibles  are  rated  below
investment grade or are not rated,  and therefore may be considered  speculative
investments.
--------------------------------------------------------------------------------

[FLAG] THE FUND IS SUBJECT TO SECTOR RISK, WHICH IS THE CHANCE THAT RETURNS FROM
     THE ECONOMIC  SECTORS IN WHICH  CONVERTIBLE  SECURITIES ARE  CONCENTRATED--
     CURRENTLY THE TECHNOLOGY, TELECOMMUNICATIONS, AND MEDIA SECTORS--WILL TRAIL
     RETURNS FROM OTHER ECONOMIC SECTORS.  AS A GROUP,  THESE SECTORS TEND TO GO
     THOUGH CYCLES OF DOING BETTER - OR WORSE - THAN THE CONVERTIBLES  MARKET IN
     GENERAL.  THESE PERIODS  HAVE,  IN THE PAST,  LASTED FOR AS LONG AS SEVERAL
     YEARS. SECTOR RISK IS QUITE HIGH FOR THE FUND.

     Securities with innovative structures have become increasingly prevalent in
the  convertible   securities  market.  These  include  "mandatory   conversion"
securities,  which consist of debt  securities or preferred  stocks that convert
automatically  into equity  securities  of the same or a  different  issuer at a
specified date and conversion ratio.  Mandatory conversion  securities may offer
limited potential for capital  appreciation and, in some instances,  are subject
to complete loss of invested  capital.  Other  innovative  convertibles  include
"equity-linked"  securities,  which are securities or derivatives  that may have
fixed,  variable, or no interest payments prior to maturity, may convert (at the
option of the holder or on a mandatory  basis) into any cash or a combination of
cash and equity  securities,  and may be  structured  to limit the potential for
capital appreciation.  Equity-linked securities may be illiquid and difficult to
value and may be subject to greater credit risk than other convertibles.

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

<PAGE>

8

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                 CREDIT QUALITY
A bond's credit quality  depends on the issuer's  ability to pay interest on the
bond and,  ultimately,  to repay the  debt.  The lower the  rating by one of the
independent  bond-rating  agencies (for example,  Moody's or Standard & Poor's),
the greater the chance--in  the rating  agency's  opinion--that  the bond issuer
will default, or fail to meet its payment  obligations.  All things being equal,
the lower a bond's credit  rating,  the higher its yield should be to compensate
investors for assuming a higher risk of payment  default.  Bonds rated in one of
the four highest rating categories are considered "investment grade."
--------------------------------------------------------------------------------

     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 of the company's  conventional  debt securities,
since convertibles 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,  Inc.  or B, BB, or BBB by  Standard  and
Poor's Rating Group, a division of the McGraw-Hill  Companies,  Inc.  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.

[FLAG] BONDS RATED LESS THAN BAA BY MOODY'S OR BBB BY STANDARD & POOR'S, SUCH AS
     THOSE HELD BY THE FUND, ARE CLASSIFIED AS NON-INVESTMENT GRADE. THESE BONDS
     CARRY A HIGH  DEGREE OF RISK AND ARE  CONSIDERED  SPECULATIVE  BY THE MAJOR
     RATING AGENCIES.

     As of November 30, 2000, the Fund's convertible securities holdings had the
following credit quality characteristics:

--------------------------------------------------------------------------------
INVESTMENT*                                          PERCENT OF FUND NET ASSETS
--------------------------------------------------------------------------------
AAA/Aaa                                                              .%
AA/Aa                                                                .%
A/A                                                                  .%
BBB/Baa                                                              .%
BB/Ba                                                                .%
B/B                                                                  .%
CCC/Ccc                                                              .%
CC/Ca                                                                .%
C/C                                                                  .%
Nonrated Securities                                                  .%
*Excludes common and preferred stocks and derivatives,  which are not subject to
ratings categorization.
--------------------------------------------------------------------------------

<PAGE>


                                                                               9

SECURITY SELECTION
Oaktree  Capital  Management,  LLC, a registered  investment  adviser  under the
Investment Advisers Act of 1940, as amended,  (Oaktree),  acts as the investment
adviser to the Fund and will generally select 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 the
adviser's  opinion,  be priced at a reasonable  premium relative to the price at
which it can be  converted  into common  stock.  Oaktree will  generally  sell a
convertible  security when the  underlying  stock price  exceeds the  conversion
price by a reasonable margin. When a convertible  security reaches this level it
may be considered an equity substitute.

     The Fund is generally managed without regard to tax ramifications.

[FLAG] THE FUND IS SUBJECT TO MANAGER RISK, WHICH IS THE CHANCE THAT THE ADVISER
     WILL DO A POOR JOB OF SELECTING SECURITIES.

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 is  authorized  to  invest  up to 20% of its  assets  in  foreign
securities that are denominated in U.S. dollars.  These securities may be traded
on U.S. or foreign  markets.  As a result,  the Fund is subject to country risk,
which is the chance that domestic events--such as political upheaval,  financial
troubles, or a natural disaster--will weaken a country's securities markets.
     The Fund may also invest 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.  The Fund will not use futures for  speculative  purposes or as  leveraged
investments  that magnify gains or losses.  The Fund's  obligation under futures
contracts will not exceed 20% of its total assets.
The reasons for which the Fund will invest in futures and options are:
o    To keep cash on hand to meet shareholder redemption requests or other needs
     while simulating full investment in stocks.
o    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  investments--in  response  to
extraordinary market, economic, political, or other conditions. In doing so, the
Fund may  succeed in  avoiding  losses  but  otherwise  may fail to achieve  its
investment objective.

<PAGE>

                                                                              10

--------------------------------------------------------------------------------
                                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).  Some forms
of  derivatives,  such as  exchange-traded  futures and  options on  securities,
commodities,  or indexes, have been trading on regulated exchanges for more than
two decades.  These types of  derivatives  are  standardized  contracts that can
easily be bought and sold,  and whose market values are determined and published
daily.  Non-standardized  derivatives,  on  the  other  hand,  tend  to be  more
specialized or complex,  and may be harder to value.  If used for speculation or
as  leveraged  investments,  derivatives  can carry  considerable  risks for the
investor. Although the Fund does not currently invest in such securities, it may
in the future.
--------------------------------------------------------------------------------

COSTS AND MARKET-TIMING
Some  investors  try to profit from a strategy  called  market-timing--switching
money into  mutual  funds when they expect  prices to rise and taking  money out
when they expect  prices 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.
This is why all  Vanguard  funds have  adopted  special  policies to  discourage
short-term trading. Specifically:
o    Each   Vanguard   fund   reserves   the  right  to  reject   any   purchase
     request--including  exchanges from other Vanguard funds--that it regards as
     disruptive to efficient portfolio  management.  A purchase request could be
     rejected because of the timing of the investment or because of a history of
     excessive trading by the investor.
o    Each  Vanguard  fund (except the money market  funds)  limits the number of
     times that an investor can exchange into and out of the fund.
o    Each Vanguard fund reserves the right to stop offering shares at any time.
o    Certain   Vanguard  funds  charge   transaction  fees  on  purchase  and/or
     redemptions of their shares.
o    Vanguard funds that hold foreign  securities may value those  securities at
     their "fair value,"  rather than the price at which those  securities  last
     traded on their primary foreign markets or exchanges,  to take into account
     events that occur after the close of those markets or exchanges.
See the INVESTING WITH VANGUARD  section of this  prospectus for further details
on Vanguard's transaction policies.

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

TURNOVER RATE
Although  the Fund  normally  seeks to  invest  for the long  term,  it may sell
securities  regardless of how long they have been held. The FINANCIAL HIGHLIGHTS
section  of this  prospectus  shows  historic  turnover  rates for the  Fund.  A
turnover  rate of  100%,  for  example,  would  mean  that the Fund had sold and
replaced securities valued at 100% of its net assets within a one-year period.

<PAGE>

                                                                              11

--------------------------------------------------------------------------------
                                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 taxable
income.  As of November 30, 2000, the average  turnover rate for all convertible
securities funds was approximately *%, according to Morningstar, Inc.
--------------------------------------------------------------------------------

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 $550 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.
--------------------------------------------------------------------------------


INVESTMENT ADVISER
Oaktree Capital Management,  LLC (Oaktree),  333 South Grand Avenue, 28th Floor,
Los Angeles,  CA 90071,  adviser to the Fund,  is an  investment  advisory  firm
founded  in 1995.  Oaktree  focuses  on certain  specialized  investment  areas,
including convertible securities. As of November 30, 2000, Oaktree managed about
$* in assets.  The firm  manages the Fund subject to the control of the trustees
and officers of the Fund.

     Oaktree's  advisory fee is paid  quarterly,  and is based on certain annual
percentage  rates  applied  to the  Fund's  average  month-end  assets  for each
quarter.  In addition,  Oaktree's  advisory  fee may be increased or  decreased,
based on the cumulative total return of the Fund over a trailing 36-month period
as compared with the  cumulative  total return of the Credit Suisse First Boston
Convertible  Securities  Index over the same period.  Please  consult the Fund's
Statement of Additional  Information for a complete  explanation of how advisory
fees are calculated.

     For the fiscal year ended November 30, 2000,  the advisory fee  represented
an effective annual rate of 0.XX% of the Fund's average net assets  [PERFORMANCE
INCREASE/DECREASE].

<PAGE>

                                                                              12

     The adviser is authorized to choose  broker-dealers  to handle the purchase
and sale of the Fund's  portfolio  securities,  and to obtain the best available
price and most  favorable  execution for all  transactions.  Also,  the Fund may
direct  the  adviser to use a  particular  broker for  certain  transactions  in
exchange for commission rebates or research services provided to the Fund.

     In the interest of obtaining better execution of a transaction, the adviser
may at times  choose  brokers who charge  higher  commissions.  If more than one
broker can obtain the best available  price and most favorable  execution,  then
the adviser is  authorized  to choose a broker who, in addition to executing the
transaction, will provide research services to the adviser or 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
The manager primarily responsible for overseeing the Fund's investments is:

LARRY W. KEELE,  Principal and a founder of Oaktree Capital  Management,  LLC in
1995. He has worked in investment  management since 1981; has managed  portfolio
investments  since 1983; and has managed the Fund since 1995.  Education:  B.A.,
Tennessee Tech University; M.B.A. in Finance, University of South Carolina.
--------------------------------------------------------------------------------

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.
     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.

<PAGE>

                                                                              13

--------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                                  DISTRIBUTIONS
As a  shareholder,  you are entitled to your  portion 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 any stock
holdings  and  the  interest  it  receives   from  any  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 dividing the net assets of the
Fund by the number of Fund shares outstanding as of the calculation date.

     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."

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 for
the Fund, 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.

<PAGE>

14

--------------------------------------------------------------------------------
                                        VANGUARD CONVERTIBLE SECURITIES FUND
                                           YEAR ENDED NOVEEMBER 30,
--------------------------------------------------------------------------------
                          2000       1999         1998        1997        1996
--------------------------------------------------------------------------------
NET ASSET VALUE,        $13.18     $11.10       $13.01      $13.07      $12.03
 BEGINNING OF YEAR
--------------------------------------------------------------------------------
INVESTMENT OPERATIONS
 Net Investment Income                .52          .52         .53         .43
 Net Realized and
  Unrealized Gain (Loss)             2.13         (.77)       1.17        1.29
  on Investments
--------------------------------------------------------------------------------
 Total from Investment
  Operations                         2.65         (.25)       1.70        1.72
--------------------------------------------------------------------------------
DISTRIBUTIONS
 Dividends from Net
  Investment Income                  (.57)        (.54)       (.47)       (.54)
 Distributions from
  Realized Capital                      -        (1.12)      (1.29)       (.14)
  Gains
--------------------------------------------------------------------------------
  Total Distributions                (.57)       (1.66)      (1.76)       (.68)
--------------------------------------------------------------------------------
NET ASSET VALUE, END               $13.18       $11.10      $13.01      $13.07
 OF YEAR
================================================================================
TOTAL RETURN                        24.85%       -2.16%      14.81%      14.88%
================================================================================

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


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

The Fund began  fiscal 2000 with a net asset value  (price) of $13.18 per share.
During  the  year,  the Fund  earned  $0.XX  per share  from  investment  income
(interest  and  dividends)  and  $0.XX  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.XX 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  ($X.XX  per  share)  minus the  distributions  ($0.XX  per share)
resulted in a share price of $XX.XX at the end of the year. This was an increase
of $0.XX per share (from  $13.18 at the  beginning  of the year to $XX.XX 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 XX.XX% for the year.

As of November 30, 2000,  the Fund had $XX billion in net assets.  For the year,
its  expense  ratio was 0.56%  ($5.60  per  $1,000 of net  assets);  and its net
investment  income  amounted to 0.XX% of its  average  net  assets.  It sold and
replaced securities valued at XX% of its net assets.
--------------------------------------------------------------------------------

<PAGE>

                                                                              15

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.
o    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 Access Center, toll-free, at 1-800-523-1188.
o    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:
o    Certain investment options,  particularly funds made up of company stock or
     investment contracts, may be subject to unique restrictions.
o    Make sure to read that fund's prospectus.  Contact  Vanguard's  Participant
     Access Center, toll-free, at 1-800-523-1188 for a copy.
o    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>

16

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;  the
online  Education  Center  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>

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 a fund
has sold at a profit, minus any realized losses.

CASH INVESTMENTS
Cash deposits,  short-term  bank  deposits,  and money market  instruments  that
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 a bond's  maturity;  also  known as the par  value or
principal.

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. Bonds rated in one of the four highest rating categories
are considered "investment-grade."

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.

PRICE/EARNINGS (P/E) RATIO
The current share price of a stock, divided by its per-share earnings (profits).
A stock  selling for $20, with  earnings of $2 per share,  has a  price/earnings
ratio of 10.

PRINCIPAL
The amount of money you put into an investment.

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

TOTAL RETURN
A percentage change,  over a specified time period, in a mutual fund's net asset
value,  assuming 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>

[SHIP]
[THE VANGUARD GROUP(R) LOGO]
Institutional Division
Post Office Box 2900
Valley Forge, PA 19482-2900

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.

All market indexes referenced in
this prospectus are the exclusive
property of their respective owners.

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 ACCESS 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 1-202-942-8090. Reports and
other information about the Fund are
also available on the SEC's Internet
site at http://www.sec.gov, or you
can receive copies of this
information, for a fee, by electronic
request at the following e-mail
address: [email protected], or by
writing the Public Reference
Section, Securities and Exchange
Commission, Washington, DC
20549-0102.


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


(C) 2001 The Vanguard Group, Inc.
All rights reserved.
Vanguard Marketing Corporation,
Distributor.

I082N 032001


<PAGE>


                                     PART B

                      VANGUARD CONVERTIBLE SECURITIES FUND
                                   (THE FUND)

                      STATEMENT OF ADDITIONAL INFORMATION


                                 MARCH 19, 2001

This Statement is not a prospectus  but should be read in  conjunction  with the
Fund's current Prospectus (dated March 19, 2001). 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-4
INVESTMENT ADVISORY SERVICES.....................................B-8
PORTFOLIO TRANSACTIONS...........................................B-10
INVESTMENT POLICIES..............................................B-11
FINANCIAL STATEMENTS.............................................B-18
YIELD AND TOTAL RETURN...........................................B-18
SHARE PRICE......................................................B-19
COMPARATIVE INDEXES..............................................B-20
APPENDIX--DESCRIPTION OF SECURITIES AND RATINGS..................B-23

                            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,  as  amended,  (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, 2001 Market Street,
Suite  1700,  Philadelphia,   Pennsylvania  19103-7042,  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.  Unless  otherwise   required  by  applicable  law,  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  of the Fund.
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 of 1986,  as amended.  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 shares means
the lesser of: (i) 67% or more of the shares voted,  so long as more than 50% of
the Fund's  outstanding shares are present or represented by proxy; or (ii) more
than 50% of the Fund's outstanding shares.


     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  purchase  price of shares of the Fund is the net asset value per share next
determined  after  the  order is  received.  The net  asset  value  per share is
calculated as of the close of the New York Stock Exchange (the Exchange) on each
day the Exchange is open for business.  An order  received prior to the close of
the Exchange will be executed at the price computed on the date of receipt;  and
an order  received after the close of the Exchange will be executed at the price
computed on the next day the Exchange is open.


     The Fund  reserves  the right in its sole  discretion  (i) to  suspend  the
offering of its shares;  (ii) to reject  purchase orders when in the judgment of
management  such  rejection  is in the best  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.


                              REDEMPTION OF SHARES

The Fund may suspend  redemption  privileges or postpone the date of payment for
redeemed  shares (i) during any period that 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.


                             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  (except Mr.  MacLaury)
also serves as a Director of The Vanguard Group, Inc. In addition,  each trustee
serves as a trustee of each of the 109 funds  administered  by Vanguard  (107 in
the case of Mr. Malkiel and 99 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.


                                      B-4
<PAGE>

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.


CHARLES D. ELLIS (DOB: 10/23/37),  Trustee Retired Managing Partner of Greenwich
Associates  (International  Business Strategy Consulting);  Successor Trustee of
Yale  University;  Overseer  of  the  Stern  School  of  Business  at  New  York
University; and Trustee of the Whitehead Institute for Biomedical Research.


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 Argentaria,  Gestion, BKF Capital (Investment Management),
The Jeffrey Co. (Holding Company),  NeuVis, Inc. (Software 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).

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 and CEO of Rohm &
Haas Co. (Chemicals);  Director of Cummins Engine Co. (Diesel Engines),  and The
Mead Corp.  (Paper  Products);  and  AmeriSource  Health  Corp.  (Pharmaceutical
Distribution); 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.



*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,  which  consists  of more than 100 funds.  Through  their
jointly-owned subsidiary, The Vanguard Group, Inc. (Vanguard), the Fund, and the
other funds in the The  Vanguard  Group  obtain at cost  virtually  all of their
corporate management, administrative, and distribution services.


                                      B-5
<PAGE>

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.

     Each fund's  officers  are also  officers and  employees  of  Vanguard.  No
officer or employee owns, or is permitted to own, any securities of any external
adviser for the funds.


     Vanguard and the Funds'  advisers have adopted Codes of Ethics  designed to
prevent employees who may have access to nonpublic information about the trading
activities of the Funds (access  persons) from profiting from that  information.
The Codes permit access  persons to invest in securities for their own accounts,
including  securities that may be held by the Funds,  but place  substantive and
procedural  restrictions  on their trading  activities.  For example,  the Codes
require that access persons receive advance  approval for every securities trade
to ensure that there is no conflict with the trading activities of the Funds.

     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.  At
November 30, 2000, the Fund had contributed capital to Vanguard  representing .%
of the Fund's net assets.  The total amount contributed by the Fund was $. which
represented  .% of Vanguard's  capitalization.  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.


     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
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 0.20 of 1% of
its average month-end net assets.

     During the fiscal years ended  November 30, 1998,  1999, and 2000, the Fund
incurred the following  approximate  amounts of The Vanguard Group's  management
(including transfer agency),  distribution,  and marketing  expenses:  $529,000,
$535,000, and $.,000, respectively.



                                      B-6
<PAGE>

     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  below),  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.

       VANGUARD CONVERTIBLE SECURITIES FUND TRUSTEES' COMPENSATION TABLE

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

                                                PENSION OR                            TOTAL COMPENSATION
                            AGGREGATE       RETIREMENT BENEFITS                            FROM ALL
                          COMPENSATION      ACCRUED AS PART OF     ESTIMATED ANNUAL     VANGUARD FUNDS
                              FROM             THESE FUNDS'         BENEFITS UPON          PAID TO
NAMES OF TRUSTEES        THESE FUNDS(1)         EXPENSES(1)          RETIREMENT           TRUSTEES(2)
---------------------------------------------------------------------------------------------------------
John J. Brennan               None                None                   None                  None
Charles D. Ellis(3)           None                None                   None                  None
JoAnn Heffernan Heisen        $                    $                      $                    $
Bruce K. MacLaury             $                    $                      $                    $
Burton G. Malkiel             $                    $                      $                    $
Alfred M. Rankin, Jr.         $                    $                      $                    $
James O. Welch, Jr.           $                    $                      $                    $
J. Lawrence Wilson            $                    $                      $                    $
---------------------------------------------------------------------------------------------------------
</TABLE>
(1)  The amounts  shown in this column are based on the Fund's fiscal year ended
     November 30, 2000.
(2)  The amounts reported in this column reflect the total  compensation paid to
     each trustee for his or her service as trustee of 109  Vanguard  funds (107
     in the case of Mr.  Malkiel;  99 in the case of Mr.  MacLaury) for the 2000
     calendar year.
(3)  Mr. Ellis  joined the Fund's board, effective January 1, 2001.

                                      B-7
<PAGE>


                          INVESTMENT ADVISORY SERVICES

The Fund has entered into an investment  advisory agreement with Oaktree Capital
Management,  LLC, a registered  investment adviser under the Investment Advisers
Act of 1940, as amended,  (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.

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

                                          PERFORMANCE FEE
CUMULATIVE PERFORMANCE OF THE FUND        ADJUSTMENT AS A
VS. THE INDEX FOR THE RELEVANT PERIOD      PERCENTAGE OF
                                             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.

                                      B-8
<PAGE>
                                                                    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.

     During the fiscal years ended  November 30, 1998,  1999, and 2000, the Fund
incurred the following investment advisory fees:

                                                1998         1999         2000
                                                ----         ----         ----
Basic Fee...................                $770,000     $695,000       $.,000
Increase or Decrease for Performa             (3,000)    (369,000)      (.,000)
Adjustment..................                  -------    ---------      -------
Total                                       $767,000     $326,000       $.,000


     The Fund's  current  agreement with its adviser is renewable for successive
one-year periods if (1) the agreement is 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,  cast in person at a meeting  called
for  the  purpose  of  considering   such  approval  or  (2)  the  agreement  is
specifically  approved by a vote of a majority of the Fund's  outstanding voting
securities.  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 sixty  (60)  days'  written  notice to  Oaktree,  (2) by a vote of a
majority of the Fund's outstanding voting securities,  or (3) by Oaktree upon 90
-- days' written notice to the Fund.


                                      B-9
<PAGE>

DESCRIPTION OF OAKTREE

Oaktree  specializes  in selected  niche  investment  markets.  The  founders of
Oaktree  formed  the  company in April 1995  after  having  managed  convertible
securities,   distressed  debt,  distressed  real-estate  activities,  principal
investments  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, 2000,
Oaktree managed approximately $. 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, as amended,  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 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, 1998,  1999, and 2000, the Fund
paid $72,951, $51,858, and $. 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  in  its
discretion.  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.


                                      B-10
<PAGE>

                              INVESTMENT POLICIES

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


     CONVERTIBLE  SECURITIES.  Convertible securities are hybrid securities that
combine the investment  characteristics of bonds and common stocks.  Convertible
securities  typically  consist of debt securities or preferred stock that may be
converted within a specified period of time (normally for the entire life of the
security) into a certain amount of common stock or other equity  security of the
same or a different  issuer at a  predetermined  price.  They also  include debt
securities with warrants or common stock attached and derivatives  combining the
features  of debt  securities  and  equity  securities.  Convertible  securities
entitle the holder to receive  interest  paid or accrued on debt,  or  dividends
paid or accrued on preferred  stock,  until the security matures or is redeemed,
converted, or exchanged.  Convertibles are often rated below investment grade or
are not rated, and therefore may be considered speculative investments.

     MARKET VALUE OF CONVERTIBLE  SECURITIES.  The market value of a convertible
security is a function of its "investment  value" and its "conversion  value." A
security's  "investment  value" represents the value of the security without its
conversion  feature  (i.e.,  a  nonconvertible   fixed  income  security).   The
investment  value may be determined  by reference to its credit  quality and the
current value of its yield to maturity or probable call date. At any given time,
investment value is dependent upon such factors as the general level of interest
rates, the yield of similar nonconvertible securities, the financial strength of
the issuer and the seniority of the security in the issuer's capital  structure.
A security's  "conversion  value" is  determined  by  multiplying  the number of
shares the holder is  entitled  to receive  upon  conversion  or exchange by the
current  price  of  the  underlying  security.  If  the  conversion  value  of a
convertible   security  is  significantly   below  its  investment   value,  the
convertible  security will trade like nonconvertible debt or preferred stock and
its market value will not be influenced  greatly by  fluctuations  in the market
price of the underlying security. Instead, the convertible security takes on the
characteristics  of a bond,  and its price moves in the  opposite  direction  of
interest rates. Conversely, if the conversion value of a convertible security is
near or above its investment value, the market value of the convertible security
will be more  heavily  influenced  by  fluctuations  in the market  price of the
underlying  security.  In that case, the convertible  security's price may be as
volatile  as that of  common  stock.  Because  both  interest  rate  and  market
movements can influence its value, a convertible security is not as sensitive to
interest  rates as a similar  fixed-income  security,  nor is it as sensitive to
changes in share price as its underlying stock.

     MANDATORY  CONVERSION  SECURITIES.  The Fund's  investments  in convertible
securities  may at times  include  securities  that have a mandatory  conversion
feature,  pursuant to which the  securities  convert  automatically  into common
stock or  other  equity  securities  (of the same or a  different  issuer)  at a
specified date and a specified  conversion ratio, or that are convertible at the
option of the issuer.  For issues where conversion of the security is not at the
option of the holder,  the Fund may be required to convert the security into the
underlying  common stock even at times when the value of the  underlying  common
stock  or  other  equity  security  has  declined  substantially.   Unlike  more
traditional convertible securities, some mandatory conversion securities have an
adjustable  conversion  ratio. In addition,  somey of these securities may limit
for capital  appreciation  and,  in some  instances,  are  subject to  unlimited
potential  for loss of capital.  These  securities  are  designed  and  marketed
principally by major investment banking firms and trade in the marketplace under
various  acronyms that are proprietary to the investment  banking firm. The Fund
may be exposed to counterparty credit risk to the extent it invests in synthetic
mandatory  conversion  securities which are issued by investment  banking firms.
Those are unsecured obligations of the issuing firm. Should the firm that issued
the security experience financial  difficulty,  its ability to perform according
to the terms of the security might become  impaired.  The Fund's  investments in
convertible  securities,  particularly  securities  that  are  convertible  into
securities of an issuer other than the issuer of the convertible  security,  may
be illiquid.  The Fund may not be able to dispose of such securities in a timely
fashion or for a fair price, which could result in losses to the Fund.

                                      B-11

<PAGE>


     CONVERTIBLE  PREFERRED  STOCK.  The Fund may invest in preferred stock that
includes  a  conversion  feature  known  as a  convertible  preferred  security.
Preferred  stock,  unlike common stock,  has a stated dividend rate payable from
the  corporation's  earnings.  Preferred  stock  dividends  may be cumulative or
non-cumulative, participating, or auction rate. "Cumulative" dividend provisions
require all or a portion of prior unpaid  dividends to be paid before  dividends
can be paid to the issuer's common stock. "Participating" preferred stock may be
entitled  to a dividend  exceeding  the stated  dividend  in certain  cases.  If
interest  rates  rise,  the  fixed  dividend  on  preferred  stocks  may be less
attractive,  causing the price of preferred  stocks to decline.  Preferred stock
may have mandatory sinking fund provisions,  as well as provisions  allowing the
stock to be called or redeemed prior to its maturity,  which can have a negative
impact on the  stock's  price  when  interest  rates  decline.  Preferred  stock
generally  has  a  preference  over  common  stock  on  the  distribution  of  a
corporation's assets in the event of liquidation of the corporation.  The rights
of preferred stock on  distribution of a corporation's  assets in the event of a
liquidation  are  generally   subordinate  to  the  rights   associated  with  a
corporation's debt securities.  While preferred stock is an equity security, all
convertible  preferred  securities have  characteristics of both a debt security
and a call option.  Typically these securities are convertible into common stock
after a  three-year  period  (although  they are callable by the issuer prior to
conversion).  They pay a  cumulative,  fixed  dividend  that is senior  to,  and
expected to be in excess of, the dividends  paid on the common stock of the same
issuer. Convertible preferred stock offers limited opportunity for appreciation,
however,  because of a call feature.  If the market value of the issuer's common
stock  increases  to or above the call  price of the  preferred  securities  the
issuer can (and would be expected to) call the  convertible  preferred  security
for  redemption at the call price.  Convertible  preferred  securities  are also
subject  to credit  risk of the issuer as to its  ability  to pay the  dividend.
Generally,  convertible preferred stock is less volatile than the related common
stock of the issuer, in part because of the fixed dividend.

     ENHANCED  AND   EQUITY-LINKED   CONVERTIBLES.   The  Fund's  investment  in
convertible securities may include securities with enhanced convertible features
or "equity-linked" features. Equity-linked securities come in many forms and may
include features,  among others, such as the following: (i) may be issued by the
issuer of the underlying  equity  security or by a company other than the one to
which the instrument is linked  (usually an investment  bank),  (ii) may convert
into equity  securities,  such as common stock,  within a stated period from the
issue  date or may be  exchanged  for cash or some  combination  of cash and the
linked  security at a value based upon the value of the linked  equity  security
within a stated  period from the issue date,  (iii) may have various  conversion
features  prior to  maturity  at the option of the holder or the issuer or both,
(iv) may limit the  appreciation  value with caps or collars of the value of the
linked equity security, and (v) may have fixed, variable or no interest payments
during the life of the security which reflect the actual or a structured  return
relative  to the  underlying  dividends  of the  linked  equity  security.  Some
equity-linked  securities have a principal  amount at maturity that depends upon
the performance of a specified equity security.  Such  equity-linked  securities
are a form of derivative  security and differ from  ordinary debt  securities in
that the principal amount received at maturity may not be fixed. Instead,  their
principal  value is based on the price of the linked equity security at the time
the security  matures.  There may be additional types of convertible  securities
with features not  specifically  referred to herein in which the Fund may invest
consistent with its investment  objective and policies.  Investments in enhanced
and  equity-linked  securities  may  subject  the Fund to  additional  risks not
ordinarily associated with investments in other convertible securities. (Because
these  securities are sometimes issued by a third party other than the issuer of
the  linked  security,  the Fund is  subject  to risks if the  underlying  stock
underperforms  and if the issuer  defaults on the payment of the dividend or the
common  stock at  maturity.)  In  addition,  the trading  market for  particular
enhanced or equity-linked securities may be less liquid, making it difficult for
the  Fund to  dispose  of a  particular  security  when  necessary  and  reduced
liquidity  in the  secondary  market  for any such  securities  may make it more
difficult to obtain market quotations for valuing the Fund's portfolio.


     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 investments  while  simulating full  investment,  to facilitate
trading, to reduce transaction costs, or to seek higher

                                      B-12
<PAGE>

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  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

                                      B-13
<PAGE>

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.

     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

                                      B-14
<PAGE>

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 U.S.  companies,  there may be less  publicly  available
information  about certain  foreign  companies  than about  domestic  companies.
Securities of some foreign companies are generally less liquid and more volatile
than securities of comparable U.S. 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.

                                      B-15
<PAGE>

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,  as
amended,  (the 1933 Act) or securities that are exempt from  registration  under
the 1933 Act,  such as commercial  paper.  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.


     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,  the adviser  believes  that they can be  controlled
through careful monitoring procedures.


                                      B-16
<PAGE>

     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 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
so long as the exemptive order is in effect and not revoked. 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.

                                      B-17
<PAGE>

                              FINANCIAL STATEMENTS

The Fund's Financial  Statements for the year ended November 30, 2000, including
the financial  highlights  for each of the five fiscal years in the period ended
November 30, 2000,  appearing in the Fund's 2000 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, 2000 was *%.

     The Fund's  average annual total return for the one-,  five-,  and ten-year
periods ended November 30, 2000, was *%, *%, and *%, 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
  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.

                                      B-18
<PAGE>

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
  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 p.m.  Eastern time, on each day that the Exchange is open
for trading.


                                      B-19
<PAGE>


     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 or the official  closing 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.


                              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 TOTAL MARKET  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  COMPLETION  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.

                                      B-20
<PAGE>

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 BROTHERS  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 CREDIT BOND  INDEX--is a subset of the Lehman Credit 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.

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  Brothers Long
Credit A or Better Bond Index.

COMPOSITE  INDEX--65%  Lehman  Brothers Long Credit A 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  BROTHERS  LONG CREDIT A 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/CREDIT  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/CREDIT  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/CREDIT  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.


                                      B-21
<PAGE>



LEHMAN BROTHERS MUTUAL FUND SHORT (1-5) U.S. CREDIT  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) U.S. CREDIT 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 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-22
<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.


                                      B-23
<PAGE>

                                                                   SAI082 032001

                                      B-24


<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)    Rule 18f-3 Plan*
(p)    Code of Ethics*


 * Filed herewith
 ** Previously filed


 +To be filed by amendment



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 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 16th day of January, 2001.


                                   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     January 16, 2001
   ---------------------------Executive Officer, and Trustee
       (Heidi Stam)
      John J. Brennan*


By:/S/ CHARLES D ELLIS Trustee                                January 16, 2001
   ---------------------------
       (Heidi Stam)
     Charles D. Ellis*



By:/S/ JOANN HEFFERNAN HEISEN Trustee                         January 16, 2001
   ---------------------------
       (Heidi Stam)
     JoAnn Heffernan Heisen*


By:/S/ BRUCE K. MACLAURY      Trustee                         January 16, 2001
   ---------------------------
       (Heidi Stam)
      Bruce K. MacLaury*


By:/S/ BURTON G. MALKIEL      Trustee                         January 16, 2001
   ---------------------------
       (Heidi Stam)
       Burton G. Malkiel*


By:/S/ ALFRED M. RANKIN, JR.  Trustee                         January 16, 2001
   ---------------------------
       (Heidi Stam)
     Alfred M. Rankin, Jr.*


By:/S/ JAMES O. WELCH, JR.    Trustee                         January 16, 2001
   ---------------------------
       (Heidi Stam)
     James O. Welch, Jr.*


By:/S/ J. LAWRENCE WILSON     Trustee                         January 16, 2001
   ---------------------------
       (Heidi Stam)
     J. Lawrence Wilson*


By:/S/ THOMAS J. HIGGINS      Treasurer and Principal         January 16, 2001
   ---------------------------Financial Officer and Principal
       (Heidi Stam)           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


Rule 18f-3 Plan. . . . . . . . . . . . . . . . . . . . Ex-99.BO
Code of Ethics. . . . . . . . . . . . . . . . . . . . .Ex-99.BP



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