VANGUARD PREFERRED STOCK FUND
497, 2000-03-01
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                   FORM N-1A

     REGISTRATION STATEMENT (NO. 2-54886) UNDER THE SECURITIES ACT OF 1933


                          PRE-EFFECTIVE AMENDMENT NO.
                        POST-EFFECTIVE AMENDMENT NO. 41

                                      AND


        REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940


                                AMENDMENT NO. 45




                         VANGUARD PREFERRED STOCK FUND
        (EXACT NAME OF REGISTRANT AS SPECIFIED IN DECLARATION OF TRUST)

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

                  REGISTRANT'S TELEPHONE NUMBER (610) 669-1000

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


               IT IS PROPOSED THAT THIS FILING BECOME EFFECTIVE:
          ON FEBRUARY 28, 2000, PURSUANT TO PARAGRAPH (B) OF RULE 485.



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



<PAGE>

VANGUARD(R)
PREFERRED STOCK
FUND

Prospectus
February 28, 2000

This prospectus contains
financial data for the
Fund through the
fiscal year ended
October 31, 1999.

[A MEMBER OF
THE VANGUARD GROUP LOGO]
<PAGE>

VANGUARD PREFERRED STOCK FUND
Prospectus
February 28, 2000


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CONTENTS
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 1 FUND PROFILE                           12 FINANCIAL HIGHLIGHTS

 4 ADDITIONAL INFORMATION                 14 INVESTING WITH VANGUARD

 4 A WORD ABOUT RISK                         14 SERVICES AND ACCOUNT FEATURES

 4 WHO SHOULD INVEST                         15 TYPES OF ACCOUNTS

 5 PRIMARY INVESTMENT STRATEGIES             15 BUYING SHARES

 8 THE FUND AND VANGUARD                     17 REDEEMING SHARES

 8 INVESTMENT ADVISER                        21 TRANSFERRING REGISTRATION

 9 DIVIDENDS, CAPITAL GAINS, AND TAXES       21 FUND AND ACCOUNT UPDATES

11 SHARE PRICE                            GLOSSARY (inside back cover)
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WHY READING THIS PROSPECTUS IS IMPORTANT
This  prospectus  explains the  objective,  risks,  and  strategies  of Vanguard
Preferred Stock Fund. To highlight  terms and concepts  important to mutual fund
investors,  we have provided "Plain Talk(R)" explanations along the way. Reading
the prospectus will help you to decide whether the Fund is the right  investment
for you. We suggest that you keep it for future reference.
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NEITHER  THE  SECURITIES  AND  EXCHANGE  COMMISSION  NOR  ANY  STATE  SECURITIES
COMMISSION HAS APPROVED OR  DISAPPROVED  OF THESE  SECURITIES OR PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
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                                                                               1

FUND PROFILE

The following profile summarizes key features of Vanguard Preferred Stock Fund.


INVESTMENT OBJECTIVE
The Fund seeks to provide current income from  investments in preferred  stocks,
with a significant portion of income that is DRD-eligible.  "DRD-eligible" means
that  income  qualifies  for  the  federal   intercorporate   dividends-received
deduction.  This  deduction  permits a  corporation  to exclude from its taxable
income a  portion,  currently  70%,  of the  income it  receives  in the form of
dividends paid by other U.S.  corporations.  A portion of the Fund's income will
be non-DRD-eligible.

INVESTMENT STRATEGIES
The Fund invests primarily in dividend-paying, investment-grade preferred stocks
of U.S.-based  companies of any size.  The Fund will invest more than 25% of its
assets in each of two industries--financial services and utilities.


PRIMARY RISKS
THE FUND'S SHARE PRICE AND TOTAL RETURN WILL FLUCTUATE  WITHIN A WIDE RANGE,  SO
AN INVESTOR  COULD LOSE MONEY OVER SHORT OR EVEN LONG PERIODS.  The Fund is also
subject to:
- -    Interest rate risk,  which is the chance that the market value of preferred
     stocks will decline for short or even long periods if interest  rates rise.
     Interest rate risk is high for preferred stocks.
- -    Credit risk,  which is the chance that an issuing  corporation will fail to
     make dividend  payments on its preferred  stock.  Many preferred stocks are
     issued by companies that lack top credit ratings.

- -    Industry  concentration  risk,  which is the chance that the Fund's returns
     could be hurt  significantly by problems  affecting a particular  industry.
     Because more than 80% of the Fund's holdings  typically are invested in the
     financial-services  and utility  industries,  the Fund's performance can be
     significantly affected by developments in those industries.

- -    Manager risk,  which is the chance that poor security  selection will cause
     the Fund to underperform other funds with similar investment objectives.
- -    Legislative  risk,  which is the chance  that a change in  federal  tax law
     could reduce or eliminate the 70% dividends-received deduction, which would
     reduce the market value of preferred stocks that pay DRD-eligible income.

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

2

              ----------------------------------------------------
                              ANNUAL TOTAL RETURNS
              ----------------------------------------------------
                                  1990     6.40%
                                  1991    20.95%
                                  1992     8.42%
                                  1993    13.04%
                                  1994    -7.95%
                                  1995    25.93%
                                  1996     8.45%
                                  1997    12.99%
                                  1998     6.68%
                                  1999    -5.82%
              ----------------------------------------------------

     During the period shown in the bar chart, the highest return for a calendar
quarter was 9.09%  (quarter  ended March 31,  1995) and the lowest  return for a
quarter was -3.71% (quarter ended March 31, 1994).

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         AVERAGE ANNUAL TOTAL RETURNS FOR YEARS ENDED DECEMBER 31, 1999
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                                    1 YEAR         5 YEARS           10 YEARS
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Vanguard Preferred Stock Fund       -5.82%          9.17%              8.45%
Preferred Stock Composite Index*    -1.20           8.16               8.25
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*Figures are for Merrill Lynch  Perpetual  Preferred  Index through January 1997
and Merrill Lynch DRD-Eligible Preferred Stock Index thereafter.

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FEES AND EXPENSES

The following  table  describes the fees and expenses you may pay if you buy and
hold shares of the Fund. The expenses shown under Annual Fund Operating Expenses
are based upon those incurred in the fiscal year ended October 31, 1999.


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

      ANNUAL FUND OPERATING EXPENSES (expenses deducted from the Fund's assets)
      Management Expenses:                                      0.33%
      12b-1 Distribution Fee:                                   None
      Other Expenses:                                           0.03%
        TOTAL ANNUAL FUND OPERATING EXPENSES:                   0.36%
<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 Preferred Stock Fund's expense ratio in fiscal year 1999 was
0.36%,  or $3.60 per $1,000 of average net  assets.  The  average  fixed  income
mutual fund in 1999 had  expenses of 1.05%,  or $10.50 per $1,000 of average net
assets (derived from data provided as of December 31, 1999 by Lipper Inc., which
reports on the mutual fund industry).  Management  expenses,  which comprise one
part of operating  expenses,  include investment  advisory fees as well as other
costs of managing a fund--such as account  maintenance,  reporting,  accounting,
legal, and other administrative expenses.
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     The following example is intended to help you compare the cost of investing
in the Fund with the cost of investing in other mutual funds. It illustrates the
hypothetical  expenses  that you would incur over various  periods if you invest
$10,000 in the Fund.  This example assumes that the Fund provides a return of 5%
a year, and that operating  expenses  remain the same. The results apply whether
or not you redeem your investment at the end of each period.

              ----------------------------------------------------
               1 YEAR       3 YEARS       5 YEARS        10 YEARS
              ----------------------------------------------------
                $37          $116          $202            $456
              ----------------------------------------------------

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

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

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ADDITIONAL INFORMATION

DIVIDENDS AND CAPITAL GAINS                        MINIMUM INITIAL INVESTMENT
Dividends are distributed quarterly in March,      $3,000
June, September, and December; capital gains, if
any, are distributed annually in December          NEWSPAPER ABBREVIATION
                                                   Prefd
INVESTMENT ADVISER
Wellington Management Company, LLP, Boston,        VANGUARD FUND NUMBER
Mass., since inception                             038

INCEPTION DATE                                     CUSIP NUMBER
December 3, 1975                                   92204P204

NET ASSETS AS OF OCTOBER 31, 1999                  TICKER SYMBOL
$315 million                                       VQIIX

SUITABLE FOR IRAS
No
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A WORD ABOUT RISK

This  prospectus  describes  risks you would  face as an  investor  in  Vanguard
Preferred  Stock Fund. It is important to keep in mind one of the main axioms of
investing: The higher the risk of losing money, the higher the potential reward.
The  reverse,  also,  is  generally  true:  The lower  the  risk,  the lower the
potential  reward.  As you consider an  investment in Vanguard  Preferred  Stock
Fund,  you should also take into account your  personal  tolerance for the daily
fluctuations of the stock market.
     Look for this [FLAG] symbol  throughout the prospectus.  It is used to mark
detailed  information  about  each  type of risk that you  would  confront  as a
shareholder of the Fund.
- --------------------------------------------------------------------------------

WHO SHOULD INVEST

The Fund may be a suitable investment for you if:
- -    You are  seeking a high  level of  income  from  your  investments  and can
     tolerate substantial price fluctuations due to changes in interest rates.
- -    You wish to add a preferred stock fund to your existing holdings.
- -    You are a corporate  investor  eligible for the federal  dividends-received
     deduction.  (Note:  Subchapter  S  corporations  are not  eligible for this
     deduction.)

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

                                                                               5

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

     The Fund has adopted the following  policies,  among others,  to discourage
short-term trading:
- -    The Fund  reserves  the right to  reject  any  purchase  request--including
     exchanges from other  Vanguard  funds--that it regards as disruptive to the
     efficient  management  of the Fund.  A purchase  request  could be rejected
     because  of the  timing  of the  investment  or  because  of a  history  of
     excessive trading by the investor.
- -    There is a limit on the  number of times you can  exchange  into and out of
     the Fund (see "Redeeming Shares" in the INVESTING WITH VANGUARD section).
- -    The Fund reserves the right to stop offering shares at any time.


PRIMARY INVESTMENT STRATEGIES

This section explains the strategies that the investment adviser uses in pursuit
of the Fund's  objective to provide current income from investments in preferred
stocks,  with a  significant  portion of income  that is  DRD-eligible.  It also
explains  how the  adviser  implements  these  strategies.  The Fund's  Board of
Trustees  oversees the  management  of the Fund,  and may change the  investment
objective or strategies in the interest of shareholders.

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

     NOTE: BECAUSE PREFERRED STOCKS SHARE MANY INVESTMENT  CHARACTERISTICS  WITH
BONDS, THE RISKS AND POTENTIAL REWARDS OF INVESTING IN THE FUND ARE MORE SIMILAR
TO THOSE ASSOCIATED WITH A BOND FUND THAN A STOCK FUND.

MARKET EXPOSURE

The Fund invests predominantly in dividend-paying,  investment-grade,  preferred
stocks  of  U.S.-based  companies.  Preferred  stocks  are  securities  that pay
dividends  at a specified  rate and have  "preference"  over common stock in the
payment of dividends and the  liquidation  of assets.  This means that a company
must pay  dividends on its  preferred  stock before  paying any dividends on its
common stock,  and that the claims of preferred  stockholders are ahead of those
of  common  stockholders  on  assets  in  a  corporate  liquidation.   Preferred
stockholders  usually have no right to vote for corporate  directors or on other
matters.

     Preferred  stocks  pay a fixed  stream of income  to  investors,  and these
income  payments  are the  primary  source of  long-term  investment  returns on
preferred  stocks.  The market value of preferred  stocks--especially  perpetual
preferred stocks,  which have no stated maturity date--is extremely sensitive to
changes in  interest  rates.  When  interest  rates  rise,  the market  value of
preferred  stocks will fall;  when interest  rates fall,  the value of preferred
stocks will rise.
     In  addition  to  perpetual  preferred  stock,  the Fund may also invest in
hybrid  preferred  securities  and other types of preferred  securities.  Hybrid
preferred  securities  have many  characteristics  similar to  preferred  stock;
however,  their  dividends are not  DRD-eligible.  Also,  like corporate  bonds,
hybrid preferred securities have defined maturity dates.
<PAGE>

6

[FLAG] THE FUND IS SUBJECT TO INTEREST  RATE RISK,  WHICH IS THE CHANCE THAT THE
MARKET VALUE OF PREFERRED  STOCKS WILL DECLINE FOR SHORT OR EVEN LONG PERIODS IF
INTEREST RATES RISE. INTEREST RATE RISK IS HIGH FOR PREFERRED STOCKS.

     As an  illustration  of interest rate risk,  the following  table shows the
effect of a 1% and a 2% change in  interest  rates on the prices of a  long-term
bond:

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                      HOW INTEREST RATE CHANGES AFFECT THE
                          VALUE OF A $1,000 INVESTMENT*
- --------------------------------------------------------------------------------
                           AFTER A 1%   AFTER A 1%   AFTER A 2%    AFTER A 2%
TYPE OF BOND (MATURITY)     INCREASE     DECREASE     INCREASE      DECREASE
- --------------------------------------------------------------------------------
Long-Term (20 years)          $889        $1,131        $794        $1,286
- --------------------------------------------------------------------------------
*Assumes a 5.5% yield.
- --------------------------------------------------------------------------------

     The  preceding  table is intended to  illustrate  interest rate risk and to
help you  determine  the degree of risk you are  willing  to  assume.  The price
changes shown in the table are not meant to represent  past or future changes in
the Fund's share price.

SECURITY SELECTION
The Fund's adviser selects securities after thoroughly  researching them and the
financial condition of their issuers, in order to ascertain the creditworthiness
of each  security  and the  issuer's  ability to make  dividend  payments on its
preferred  stock.  A security will be sold when it is no longer as attractive as
an alternative investment.

[FLAG] THE FUND IS SUBJECT TO CREDIT RISK, WHICH IS THE CHANCE THAT AN ISSUER OF
PREFERRED STOCK WILL FAIL TO PAY DIVIDENDS IN A TIMELY MANNER.

     The failure of an issuer to pay  dividends  in a timely  manner may cause a
decline in income and  potentially  in market value.  The Fund tries to moderate
credit  risk by owning  securities  issued by many  different  companies  and by
avoiding  preferred stocks with credit ratings below investment grade.  Although
preferred  stocks  usually carry lower credit  ratings than  ordinary  corporate
bonds issued by the same company,  the Fund normally maintains an average credit
quality  of  "a",  which  is  defined  by  Moody's   Investors  Service  as  "an
upper-medium  grade  preferred  stock" whose  earnings and asset  protection are
"expected to be maintained at adequate levels."


[FLAG] THE FUND IS SUBJECT TO INDUSTRY  CONCENTRATION  RISK, WHICH IS THE CHANCE
THAT THE FUND'S  RETURNS  COULD BE HURT  SIGNIFICANTLY  BY PROBLEMS  AFFECTING A
PARTICULAR  INDUSTRY.  BECAUSE THE BULK OF THE FUND'S  HOLDINGS  (TYPICALLY MORE
THAN 80%) ARE INVESTED IN TWO INDUSTRIES--FINANCIAL  SERVICES AND UTILITIES--ITS
PERFORMANCE CAN BE SIGNIFICANTLY AFFECTED BY DEVELOPMENTS IN THOSE INDUSTRIES.

<PAGE>

                                                                               7

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                                PLAIN TALK ABOUT
                              FUND DIVERSIFICATION
In general, the more diversified a fund's stock holdings,  the less likely it is
that a specific  stock's poor  performance  will hurt the fund. One measure of a
fund's  diversification  is the percentage of its assets  represented by its ten
largest  holdings.  The  average  U.S.  equity  mutual fund has about 30% of its
assets invested in its ten largest holdings,  while some less-diversified  funds
have more than 50% of their assets invested in the stocks of just ten companies.
- --------------------------------------------------------------------------------

     As of October 31, 1999,  the Fund had invested 45% of net assets in its top
ten holdings  including  11% of net assets in  securities  issued by the Federal
Home Loan Corporation, a quasi-governmental financial services corporation.

     Investment  grade  preferred   stocks  are  issued  by  comparatively   few
companies,  and the Fund may have difficulty finding enough suitable  securities
to meet its  investment  objective if new  preferred  stock  issuance  decreases
substantially  or new investments in the Fund increase  substantially.  Although
the Fund's  adviser  strives to maintain  exposure to several  industries,  most
investment-grade  preferred  stocks are issued by companies within the financial
services and utilities  industries.  As a result,  it is difficult to spread the
Fund's assets across industry groups.
     The  profitability of both financial  services and utilities  industries is
heavily  influenced  by  the  level  of  interest  rates,   changing  regulatory
environments,  and  intensifying  competition.  Other  factors that can harm the
performance of financial-services  companies include fluctuations in the economy
and  financial  markets.  Among  other  factors  that  can  harm  the  financial
performance of utilities are changes in energy costs, environmental regulations,
and increased competition due to deregulation of prices and supply.


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

     The Fund is generally managed without regard to tax ramifications.

[FLAG] THE FUND IS  SUBJECT  TO  LEGISLATIVE  RISK,  WHICH IS THE CHANCE  THAT A
CHANGE IN FEDERAL TAX LAW COULD REDUCE OR ELIMINATE  THE 70%  DIVIDENDS-RECEIVED
DEDUCTION,  WHICH WOULD  REDUCE THE MARKET  VALUE OF  PREFERRED  STOCKS THAT PAY
DRD-ELIGIBLE INCOME.

     Current tax law allows  corporations  to exclude  from gross  income 70% of
"qualified" dividends received from other domestic corporations that are subject
to federal  income tax.  This  dividends-received  deduction  (DRD)  effectively
increases the after-tax return of dividends from preferred stocks.
     From time to time, proposals have been made to lower the 70% DRD. If such a
tax law  change  were  made,  the  market  value of  preferred  stocks  that pay
DRD-eligible  income  would  decline  to  compensate  for the  higher  tax  that
corporate investors would have to pay on the dividends.

TURNOVER RATE
Although the Fund  generally  seeks to invest for the long term,  it retains the
right to sell  securities  regardless of how long the securities have been held.
The Fund's average
<PAGE>

8

turnover  rate for the past five years has been about 27%. (A  turnover  rate of
100% would occur, for example,  if the Fund sold and replaced  securities valued
at 100% of its net assets within a one-year period.)

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                                PLAIN TALK ABOUT
                                  TURNOVER RATE
Before  investing in a mutual fund,  you should review its turnover  rate.  This
gives an  indication  of how  transaction  costs could affect the fund's  future
returns.  In general,  the greater the volume of buying and selling by the fund,
the greater the impact that brokerage  commissions and other  transaction  costs
will have on its return. Also, funds with high turnover rates may be more likely
to generate  capital gains that must be  distributed to  shareholders  as income
subject to taxes.  As of October 31,  1999,  the average  turnover  rate for all
domestic stock funds was approximately 87%, according to Morningstar, Inc.
- --------------------------------------------------------------------------------

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


THE FUND AND VANGUARD

The Fund is a member of The Vanguard  Group, a family of more than 35 investment
companies  with more than 100 funds holding assets worth more than $530 billion.
All of the  Vanguard  funds  share  in the  expenses  associated  with  business
operations, such as personnel, office space, equipment, and advertising.
     Vanguard  also  provides   marketing   services  to  the  funds.   Although
shareholders do not pay sales commissions or 12b-1  distribution fees, each fund
pays its allocated share of The Vanguard Group's marketing costs.

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


INVESTMENT ADVISER

The Fund employs Wellington Management Company, LLP (Wellington Management),  75
State Street, Boston, MA 02109, as its investment adviser. Wellington Management
manages the Fund  subject to the  control of the  Trustees  and  officers of the
Fund.
<PAGE>

                                                                               9

     Wellington  Management's advisory fee is paid quarterly.  This fee is based
on certain  annual  percentage  rates  applied to the Fund's  average  month-end
assets for each quarter.
     For the fiscal year ended  October 31, 1999,  the  investment  advisory fee
paid to Wellington  Management  represented an effective annual rate of 0.13% of
the Fund's average net assets.
     The Fund has authorized  Wellington Management to choose brokers or dealers
to handle the purchase and sale of securities  for the Fund, and to get the best
available price and most favorable  execution from these brokers with respect to
all transactions.
     In the interest of obtaining better execution of a transaction,  Wellington
Management  may choose brokers who charge higher  commissions.  If more than one
broker can obtain the best  available  price and most  favorable  execution of a
transaction, then Wellington Management is authorized to choose a broker who, in
addition  to  executing  the  transaction,  will  provide  research  services to
Wellington  Management  or the  Fund.  Also,  the  Fund  may  direct  Wellington
Management to use a particular  broker for certain  transactions in exchange for
commission rebates or research services provided to the Fund.
     The Board of Trustees may, without prior approval from shareholders, change
the terms of an advisory agreement or hire a new investment adviser--either as a
replacement for an existing adviser or as an additional adviser. Any significant
change in the Fund's advisory  arrangements will be communicated to shareholders
in writing. In addition, as the Fund's sponsor and overall manager, The Vanguard
Group may provide investment advisory services to the Fund, on an at-cost basis,
at any time.

- --------------------------------------------------------------------------------
                                PLAIN TALK ABOUT
                               THE FUND'S ADVISER
Wellington  Management  Company,  LLP is an investment  advisory firm founded in
1928.  As of October 31,  1999,  Wellington  Management  managed  more than $224
billion in stock and bond funds, including all or part of 14 Vanguard funds. The
manager responsible for overseeing the implementation of Wellington Management's
strategy for Vanguard Preferred Stock Fund is:

EARL E. MCEVOY,  Senior Vice President and Partner of Wellington  Management and
Fund Manager since 1982; has worked in investment  management  since 1972;  with
Wellington  Management since 1978; B.A.,  Dartmouth  College;  M.B.A.,  Columbia
Business School.
- --------------------------------------------------------------------------------


DIVIDENDS, CAPITAL GAINS, AND TAXES

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

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:
<PAGE>

10

- -    Distributions  are taxable to you whether or not you reinvest these amounts
     in additional Fund shares.
- -    Distributions   declared  in  December--if  paid  to  you  by  the  end  of
     January--are taxable as if received in December.
- -    Any dividends and short-term  capital gains that you receive are taxable to
     you as ordinary income for federal income tax purposes.
- -    Any  distributions  of net  long-term  capital  gains are taxable to you as
     long-term capital gains for federal income tax purposes, no matter how long
     you've owned shares in the Fund.
- -    Capital gains  distributions  may vary  considerably from year to year as a
     result of the Fund's normal investment activities and cash flows.
- -    A sale or exchange of Fund shares is a taxable  event.  This means that you
     may have a capital gain to report as income, or a capital loss to report as
     a deduction, when you complete your federal income tax return.
- -    State and local  income  taxes may apply to any  dividend or capital  gains
     distributions  that you  receive,  as well as your gains or losses from any
     sale or exchange of Fund shares.

GENERAL INFORMATION
BACKUP  WITHHOLDING.   By  law,  Vanguard  must  withhold  31%  of  any  taxable
distributions  or  redemptions  from your  account if you do not provide us with
your  correct  taxpayer  identification  number and certify  that it is correct.
Similarly,  Vanguard  must withhold from your account if the IRS instructs us to
do so.
FOREIGN  INVESTORS.  The Vanguard funds  generally do not offer their shares for
sale outside of the United States.  Foreign  investors should be aware that U.S.
withholding and estate taxes may apply to any investments in Vanguard funds.
INVALID  ADDRESSES.  If a dividend or capital gains distribution check mailed to
your address of record is returned as undeliverable, Vanguard will automatically
reinvest  all future  distributions  until you  provide us with a valid  mailing
address.
TAX CONSEQUENCES.  This prospectus provides general tax information only. If you
are investing through a tax-deferred retirement account, such as an IRA, special
tax rules apply. Please consult your tax adviser for detailed  information about
a fund's tax consequences for you.

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

                                                                              11

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


SHARE PRICE

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

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

     Knowing the daily net asset value is useful to you as a shareholder because
it indicates the current value of your investment. The Fund's NAV, multiplied by
the  number of  shares  you own,  gives you the  dollar  amount  you would  have
received had you sold all of your shares back to the Fund that day.
     A NOTE ON PRICING:  The Fund's  investments  will be priced at their market
value when market  quotations are readily  available.  When these quotations are
not  readily  available,  investments  will  be  priced  at  their  fair  value,
calculated according to procedures adopted by the Fund's Board of Trustees.
     The Fund's  share price can be found  daily in the mutual fund  listings of
most major newspapers under the heading "Vanguard  Funds." Different  newspapers
use different abbreviations of the Fund's name, but the most common is PREFD.
<PAGE>

12

FINANCIAL HIGHLIGHTS

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


- --------------------------------------------------------------------------------
                                            VANGUARD PREFERRED STOCK FUND
                                               YEAR ENDED OCTOBER 31,
                                       -----------------------------------------
                                         1999     1998    1997     1996    1995
- --------------------------------------------------------------------------------
NET ASSET VALUE, BEGINNING OF YEAR     $10.36   $10.17   $9.67    $9.61   $8.35
- --------------------------------------------------------------------------------
INVESTMENT OPERATIONS
 Net Investment Income                   .590      .58     .63      .69     .66
 Net Realized and Unrealized Gain
   (Loss) on Investments                (.825)     .22     .53      .04    1.25
                                       -----------------------------------------
   Total from Investment Operations     (.235)     .80    1.16      .73    1.91
                                       -----------------------------------------
DISTRIBUTIONS
 Dividends from Net Investment Income   (.560)    (.61)   (.66)    (.67)   (.65)
 Distributions from Realized Capital
   Gains                                (.125)     ---     ---      ---     ---
                                       -----------------------------------------
   Total Distributions                  (.685)    (.61)   (.66)    (.67)   (.65)
- --------------------------------------------------------------------------------
NET ASSET VALUE, END OF YEAR            $9.44   $10.36  $10.17    $9.67   $9.61
================================================================================
TOTAL RETURN                           -2.47%    8.00%  12.44%    8.04%  23.79%
================================================================================
RATIOS/SUPPLEMENTAL DATA
 Net Assets, End of Year (Millions)      $315     $381    $320     $286    $308
 Ratio of Total Expenses to
   Average Net Assets                   0.36%    0.36%   0.37%    0.39%   0.52%
 Ratio of Net Investment Income to
   Average Net Assets                   5.76%    5.60%   6.41%    7.23%   7.43%
 Turnover Rate                            11%      39%     34%      31%     20%
================================================================================
<PAGE>

                                                                              13

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

The Fund began  fiscal 1999 with a net asset value  (price) of $10.36 per share.
During  the year,  the Fund  earned  $0.590  per share  from  investment  income
(interest and  dividends).  There was a decline of $0.825 per share in the value
of  investments  held or sold by the Fund,  resulting in a net decline of $0.235
from investment operations.

Shareholders received $0.685 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.

Investment losses ($0.235 per share) plus the  distributions  ($0.685 per share)
resulted in a share  price of $9.44 at the end of the year.  This was a decrease
of $0.92 per share (from $10.36 at the beginning of the year to $9.44 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 -2.47% for the year.

As of October 31, 1999,  the Fund had $315 million in net assets.  For the year,
its  expense  ratio was 0.36%  ($3.60  per  $1,000 of net  assets);  and its net
investment  income  amounted to 5.76% of its  average  net  assets.  It sold and
replaced securities valued at 11% of its net assets.
- --------------------------------------------------------------------------------














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

14

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

Are you looking for the most  convenient  way to open or add money to a Vanguard
account?  Obtain instant access to fund information?  Establish an account for a
minor child or for your retirement savings?
     Vanguard  can help.  Our goal is to make it easy and pleasant for you to do
business with us.
     The following  sections of the prospectus briefly explain the many services
we offer.  Booklets providing detailed information are available on the services
marked with a [BOOKLET]. Please call us to request copies.
- --------------------------------------------------------------------------------


SERVICES AND ACCOUNT FEATURES

Vanguard  offers many services that make it convenient to buy, sell, or exchange
shares, or to obtain fund or account information.
- --------------------------------------------------------------------------------
TELEPHONE REDEMPTIONS (SALES AND EXCHANGES)
Automatically set up for this Fund unless you notify us otherwise.
- --------------------------------------------------------------------------------
VANGUARD(R) DIRECT DEPOSIT SERVICE [BOOKLET]
Automatic  method  for  depositing  your  paycheck  or U.S.  government  payment
(including Social Security and government pension checks) into your account.
- --------------------------------------------------------------------------------
VANGUARD(R) AUTOMATIC EXCHANGE SERVICE [BOOKLET]
Automatic  method for  moving a fixed  amount of money  from one  Vanguard  fund
account to another.
- --------------------------------------------------------------------------------
VANGUARD FUND EXPRESS(R) [BOOKLET]
Electronic  method for buying or selling shares.  You can transfer money between
your  Vanguard  fund account and an account at your bank,  savings and loan,  or
credit union on a systematic schedule or whenever you wish.
- --------------------------------------------------------------------------------
VANGUARD DIVIDEND EXPRESS(TM) [BOOKLET]
Electronic method for transferring  dividend and/or capital gains  distributions
directly  from your  Vanguard  fund account to your bank,  savings and loan,  or
credit union account.
- --------------------------------------------------------------------------------
VANGUARD TELE-ACCOUNT(R) 1-800-662-6273 (ON-BOARD) [BOOKLET]
Toll-free  24-hour access to Vanguard fund and account  information--as  well as
some  transactions--by  using any touch-tone phone.  Tele-Account provides total
return,  share price, price change, and yield quotations for all Vanguard funds;
gives your account balances and history (e.g., last transaction, latest dividend
distribution);  and  allows  you to sell or  exchange  shares  to and from  most
Vanguard funds.
- --------------------------------------------------------------------------------
ACCESS VANGUARD(TM) www.vanguard.com [COMPUTER]
You can use your  personal  computer to perform  certain  transactions  for most
Vanguard  funds by accessing our website.  To establish  this service,  you must
register  through our website.  We will then mail you an account access password
that  allows  you  to  process  the  following   financial  and   administrative
transactions  online:
- -    Open a new account.*
- -    Buy, sell, or exchange shares of most funds.
- -    Change your name/address.
<PAGE>

                                                                              15

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

*Only current Vanguard shareholders can open a new account online, by exchanging
shares from other existing Vanguard accounts.
- --------------------------------------------------------------------------------
INVESTOR INFORMATION DEPARTMENT: 1-800-662-7447 (SHIP)  TEXT  TELEPHONE:
1-800-952-3335
Call  Vanguard for  information  on our funds,  fund  services,  and  retirement
accounts, and to request literature.
- --------------------------------------------------------------------------------
CLIENT SERVICES DEPARTMENT: 1-800-662-2739 (CREW) TEXT TELEPHONE: 1-800-749-7273
Call Vanguard for information on your account, account transactions, and account
statements.
- --------------------------------------------------------------------------------
SERVICES FOR CLIENTS OF VANGUARD'S INSTITUTIONAL DIVISION: 1-888-809-8102
Vanguard's  Institutional  Division offers a variety of specialized services for
large  institutional   investors,   including  the  ability  to  effect  account
transactions through private electronic networks and third-party recordkeepers.
- --------------------------------------------------------------------------------


TYPES OF ACCOUNTS

Individuals and institutions can establish a variety of accounts with Vanguard.
- --------------------------------------------------------------------------------
FOR ONE OR MORE PEOPLE
Open an account in the name of one (individual) or more (joint tenants) people.
- --------------------------------------------------------------------------------
FOR HOLDING PERSONAL TRUST ASSETS [BOOKLET]
Invest assets held in an existing personal trust.
- --------------------------------------------------------------------------------
FOR AN ORGANIZATION [BOOKLET]
Open an account as a corporation,  partnership,  endowment, foundation, or other
entity.
- --------------------------------------------------------------------------------

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


BUYING SHARES

You buy your shares at the Fund's next-determined net asset value after Vanguard
receives your request.  As long as your request is received  before the close of
trading on the New York Stock Exchange,  generally 4 p.m. Eastern time, you will
buy your shares at that day's net asset value.
<PAGE>

16

- --------------------------------------------------------------------------------
MINIMUM INVESTMENT TO . . .
open a new account
$3,000.

add to an existing account
$100 by mail or exchange; $1,000 by wire.
- --------------------------------------------------------------------------------
A NOTE ON LOW BALANCES
The Fund  reserves  the  right to close any  nonretirement  fund  account  whose
balance falls below the minimum initial  investment.  The Fund will deduct a $10
annual fee in June if your  nonretirement  account balance at that time is below
$2,500.  The low balance fee is waived for investors who have aggregate Vanguard
account assets of $50,000 or more.
- --------------------------------------------------------------------------------
BY MAIL TO . . . [ENVELOPE]
open a new account
Complete and sign the account registration form and enclose your check.

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

Make your check payable to: The Vanguard Group-38
All  purchases  must be made in U.S.  dollars,  and checks must be drawn on U.S.
banks.

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

For clients of Vanguard's Institutional Division . . .

First-class mail to:                    Express or Registered mail to:
The Vanguard Group                      The Vanguard Group
P.O. Box 2900                           455 Devon Park Drive
Valley Forge, PA 19482-2900             Wayne, PA 19087-1815
- --------------------------------------------------------------------------------
IMPORTANT  NOTE:  To prevent  check fraud,  Vanguard will not accept checks made
payable to third parties.
- --------------------------------------------------------------------------------
BY TELEPHONE TO . . . [TELEPHONE]
open a new account
Call Vanguard  Tele-Account*  24 hours a day--or Client Services during business
hours--to exchange from another Vanguard fund account with the same registration
(name, address,  taxpayer  identification  number, and account type). (Note that
some restrictions apply to index fund accounts.)

add to an existing account
Call Vanguard  Tele-Account*  24 hours a day--or Client Services during business
hours--to exchange from another Vanguard fund account with the same registration
(name, address,  taxpayer  identification  number, and account type). (Note that
some restrictions  apply to index fund accounts.) Use Vanguard Fund Express (see
"Services and Account Features")
<PAGE>

                                                                              17

to transfer  assets from your bank  account.  Call Client  Services  before your
first use to verify that this option is available.

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

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

Wire to:
FRB ABA 021001088
HSBC Bank USA

For credit to:
Account: 000112046
Vanguard Incoming Wire Account

In favor of:
Vanguard Preferred Stock Fund-38
[Account number, or temporary number for a new account]
[Registered account owner(s)]
[Registered address]
- --------------------------------------------------------------------------------
You can redeem (that is, sell or exchange) shares purchased by check or Vanguard
Fund  Express  at any time.  However,  while  your  redemption  request  will be
processed  at the  next-determined  net asset value after it is  received,  your
redemption  proceeds  will not be available  until  payment for your purchase is
collected, which may take up to ten calendar days.
- --------------------------------------------------------------------------------
A NOTE ON LARGE PURCHASES
It is important that you call Vanguard  before you invest a large dollar amount.
It is our responsibility to consider the interests of all Fund shareholders, and
so we  reserve  the right to refuse any  purchase  that may  disrupt  the Fund's
operation or performance.
- --------------------------------------------------------------------------------


REDEEMING SHARES

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

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

*May require a signature guarantee; see footnote on page 20.
<PAGE>

18

When Exchanging Shares:
- -    The redemption proceeds are used to purchase shares of a different Vanguard
     fund.
- -    You must meet the receiving fund's minimum investment requirements.
- -    Vanguard reserves the right to revise or terminate the exchange  privilege,
     limit the amount of an exchange, or reject an exchange at any time, without
     notice.
- -    In  order  to  exchange  into  an  account  with a  different  registration
     (including a different name, address, or taxpayer  identification  number),
     you must obtain the guaranteed  signatures of all current account owners on
     your written instructions.

In both  cases,  your  transaction  will be based on the Fund's  next-determined
share price, subject to any special rules discussed in this prospectus.
- --------------------------------------------------------------------------------
NOTE:  Once a redemption  is initiated  and a  confirmation  number  given,  the
transaction CANNOT be canceled.
- --------------------------------------------------------------------------------
HOW TO REQUEST A REDEMPTION
You can request a  redemption  from your Fund  account in any one of three ways:
online, by telephone, or by mail.
     The Vanguard funds whose shares you cannot  exchange online or by telephone
are VANGUARD U.S.  STOCK INDEX FUNDS,  VANGUARD  BALANCED  INDEX FUND,  VANGUARD
INTERNATIONAL  STOCK INDEX FUNDS,  VANGUARD REIT INDEX FUND, and VANGUARD GROWTH
AND INCOME FUND. These funds do, however,  permit online and telephone exchanges
within  IRAs and other  retirement  accounts.  If you sell shares of these funds
online, you will receive a redemption check at your address of record.
- --------------------------------------------------------------------------------
ONLINE REQUESTS [COMPUTER]
ACCESS VANGUARD at www.vanguard.com
You can use your personal  computer to sell or exchange  shares of most Vanguard
funds by accessing our website.  To establish  this  service,  you must register
through our website.  We will then mail you an account access password that will
enable  you to sell  or  exchange  shares  online  (as  well  as  perform  other
transactions).
- --------------------------------------------------------------------------------
TELEPHONE REQUESTS [TELEPHONE]
All Account Types Except Retirement:
Call Vanguard  Tele-Account  24 hours a day--or Client  Services during business
hours-- to sell or exchange  shares.  You can exchange  shares from this Fund to
open an account in another Vanguard fund or to add to an existing  Vanguard fund
account with an identical registration.

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

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

                                                                              19

- -    The ten-digit account number.
- -    The name and address exactly as registered on the account.
- -    The primary Social Security or employer identification number as registered
     on the account.
- -    The  Personal   Identification   Number,   if  applicable   (for  instance,
     Tele-Account).

     Please note that Vanguard will not be  responsible  for any account  losses
due to telephone  fraud, so long as we have taken reasonable steps to verify the
caller's identity.  If you wish to remove the telephone  redemption feature from
your account, please notify us in writing.
- --------------------------------------------------------------------------------
A NOTE ON UNUSUAL CIRCUMSTANCES
Vanguard  reserves the right to revise or  terminate  the  telephone  redemption
privilege at any time,  without notice.  In addition,  Vanguard can stop selling
shares or postpone  payment at times when the New York Stock  Exchange is closed
or under any emergency  circumstances  as determined by the U.S.  Securities and
Exchange Commission.  If you experience difficulty making a telephone redemption
during  periods  of  drastic  economic  or market  change,  you can send us your
request  by  regular or express  mail.  Follow  the  instructions  on selling or
exchanging shares by mail in this section.
- --------------------------------------------------------------------------------
MAIL REQUESTS [ENVELOPE]
All Account Types Except Retirement:
Send a letter of instruction signed by all registered  account holders.  Include
the fund name and  account  number and (if you are  selling) a dollar  amount or
number  of shares  OR (if you are  exchanging)  the name of the fund you want to
exchange  into and a dollar  amount or number of  shares.  To  exchange  into an
account  with a different  registration  (including a different  name,  address,
taxpayer identification number, or account type), you must provide Vanguard with
written  instructions  that  include the  guaranteed  signatures  of all current
owners of the fund from which you wish to redeem.

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

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

For clients of Vanguard's Institutional Division . . .

First-class mail to:                    Express or Registered mail to:
The Vanguard Group                      The Vanguard Group
P.O. Box 2900                           455 Devon Park Drive
Valley Forge, PA 19482-2900             Wayne, PA 19087-1815
- --------------------------------------------------------------------------------
A NOTE ON LARGE REDEMPTIONS
It is important that you call Vanguard  before you redeem a large dollar amount.
It is our responsibility to consider the interests of all fund shareholders, and
so we reserve the right to delay  delivery of your  redemption  proceeds--up  to
seven days--if the amount may disrupt the Fund's operation or performance.
     If you redeem more than  $250,000  worth of Fund  shares  within any 90-day
period,  the  Fund  reserves  the  right  to pay  part or all of the  redemption
proceeds above $250,000  in-kind,  i.e., in securities,  rather than in cash. If
payment is made in-kind,  you may incur  brokerage  commissions  if you elect to
sell the securities for cash.
- --------------------------------------------------------------------------------
<PAGE>

20

OPTIONS FOR REDEMPTION PROCEEDS
You may  receive  your  redemption  proceeds in one of four ways:  check,  wire,
exchange to another Vanguard fund, or Fund Express Redemption.
- --------------------------------------------------------------------------------
CHECK REDEMPTIONS
Normally,  Vanguard  will  mail  your  check  within  two  business  days  of  a
redemption.
- --------------------------------------------------------------------------------
WIRE REDEMPTIONS
The wire redemption option is not automatic; you must establish it by completing
a special  form or the  appropriate  section of your account  application.  Wire
redemptions can be initiated by mail or by telephone during Vanguard's  business
hours, but not online.  For telephone requests made by 4 p.m. EST, the wire will
arrive at your bank by the close of business on the following business day.

NOTE: Wire redemptions of less than $5,000 are subject to a $5 processing fee.
- --------------------------------------------------------------------------------
EXCHANGE REDEMPTIONS
As described  above, an exchange  involves using the proceeds of your redemption
to purchase shares of another Vanguard fund.
- --------------------------------------------------------------------------------
FUND EXPRESS REDEMPTIONS
Vanguard  will  electronically  transfer  funds to your  pre-linked  checking or
savings account.
- --------------------------------------------------------------------------------

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

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

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

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

                                                                              21

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

The Vanguard Group
455 Devon Park Drive
Wayne, PA 19087-1815
- --------------------------------------------------------------------------------
ALL TRADES ARE FINAL
Vanguard  will not cancel any  transaction  request  (including  any purchase or
redemption)  that we believe to be authentic once the request has been initiated
and a confirmation number assigned.
- --------------------------------------------------------------------------------
UNCASHED CHECKS
Please cash your distribution or redemption  checks promptly.  Vanguard will not
pay interest on uncashed checks.
- --------------------------------------------------------------------------------


TRANSFERRING REGISTRATION

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

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

For clients of Vanguard's Institutional Division . . .

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


FUND AND ACCOUNT UPDATES

STATEMENTS AND REPORTS
We will send you account and tax  statements to help you keep track of your Fund
account  throughout  the year as well as when you are preparing  your income tax
returns.
     In addition,  you will  receive  financial  reports  about the Fund twice a
year.  These   comprehensive   reports  include  an  assessment  of  the  Fund's
performance (and a comparison to its
<PAGE>

22

industry  benchmark),  an overview of the financial  markets,  a report from the
advisers,  and the Fund's  financial  statements  which include a listing of the
Fund's holdings.
     To keep  the  Fund's  costs  as low as  possible  (so  that  you and  other
shareholders can keep more of the Fund's investment earnings), Vanguard attempts
to  eliminate  duplicate  mailings  to the same  address.  When two or more Fund
shareholders  have the same last name and address,  we send just one Fund report
to that address--instead of mailing separate reports to each shareholder. If you
want us to send  separate  reports,  notify our Client  Services  Department  at
1-800-662-2739.
- --------------------------------------------------------------------------------
CONFIRMATION STATEMENT
Sent each time you buy,  sell, or exchange  shares;  confirms the trade date and
the amount of your transaction.
- --------------------------------------------------------------------------------
PORTFOLIO SUMMARY [BOOKLET]
Mailed  quarterly for most  accounts;  shows the market value of your account at
the close of the statement period, as well as distributions,  purchases,  sales,
and exchanges for the current calendar year.
- --------------------------------------------------------------------------------
FUND FINANCIAL REPORTS
Mailed in December and June for this Fund.
- --------------------------------------------------------------------------------
TAX STATEMENTS
Generally  mailed in January;  report previous year's dividend and capital gains
distributions and proceeds from the sale of shares.
- --------------------------------------------------------------------------------
AVERAGE COST REVIEW STATEMENT [BOOKLET]
Issued quarterly for most taxable accounts (accompanies your Portfolio Summary);
shows the average  cost of shares that you redeemed  during the  calendar  year,
using only the average cost single category method.
- --------------------------------------------------------------------------------
<PAGE>

                      (THIS PAGE INTENTIONALLY LEFT BLANK.)

<PAGE>

                      (THIS PAGE INTENTIONALLY LEFT BLANK.)

<PAGE>

GLOSSARY OF INVESTMENT TERMS

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

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

CREDIT QUALITY
An assessment  of the ability of a preferred  stock issuer to pay dividends 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.

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

MUTUAL FUND
An  investment  company  that pools the money of many people and invests it in a
variety of securities in an effort to achieve a specific objective over time.

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

PERPETUAL PREFERRED
A type of preferred stock that has no stated maturity date.

PREFERRED STOCK
A class of capital stock on which a company pays dividends at a specified  rate.
Preferred  stock  dividends  must be paid before a company can pay  dividends on
common  stock.  Also,  preferred  stockholders  have a  claim  ahead  of  common
stockholders to corporate assets in the event of a liquidation.

PRINCIPAL
The amount of money you put into an investment.

SECURITIES
Stocks, bonds, and other investment vehicles.

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

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

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

[SHIP LOGO]
[THE VANGUARD GROUP LOGO]
Post Office Box 2600
Valley Forge, PA 19482-2600

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


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


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

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

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

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

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

TEXT TELEPHONE:
1-800-952-3335

WORLD WIDE WEB:
WWW.VANGUARD.COM

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

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

TEXT TELEPHONE:
1-800-749-7273


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


Fund's Investment Company Act
file number: 811-2601

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

P038N-02/28/2000
<PAGE>

                                     PART B

                         VANGUARD PREFERRED STOCK FUND
                                   (THE FUND)

                      STATEMENT OF ADDITIONAL INFORMATION

                               FEBRUARY 28, 2000


This Statement is not a prospectus,  but should be read in conjunction  with the
Fund's current Prospectus (dated February 28, 2000). To obtain,  without charge,
the Prospectus or the most recent Annual Report to Shareholders,  which contains
the Fund's  financial  statements as hereby  incorporated  by reference,  please
call:


                        INVESTOR INFORMATION DEPARTMENT:
                                 1-800-662-7447

                                TABLE OF CONTENTS

                                                                            PAGE
DESCRIPTION OF THE FUND......................................................B-1
INVESTMENT POLICIES..........................................................B-3
YIELD AND TOTAL RETURN.......................................................B-6
SHARE PRICE..................................................................B-7
PURCHASE OF SHARES...........................................................B-8
REDEMPTION OF SHARES.........................................................B-8
FUNDAMENTAL INVESTMENT LIMITATIONS...........................................B-9
MANAGEMENT OF THE FUND......................................................B-10
INVESTMENT ADVISORY SERVICES................................................B-13
PORTFOLIO TRANSACTIONS......................................................B-14
FINANCIAL STATEMENTS........................................................B-15
COMPARATIVE INDEXES.........................................................B-15
APPENDIX-DESCRIPTION OF PREFERRED STOCK RATINGS.............................B-17


                            DESCRIPTION OF THE FUND

ORGANIZATION

The Fund was originally organized as a Maryland corporation in 1975. In 1984 the
Fund was reorganized into a Pennsylvania business trust, and on May 29, 1998 was
again  reorganized  into a Delaware  business trust. The Fund is registered with
the United States Securities and Exchange  Commission (the Commission) under the
Investment  Company  Act of 1940  (the  1940  Act) as an  open-end,  diversified
management investment company. It currently offers a single class of shares, but
has the  ability to offer  additional  share  classes.  There is no limit on the
number of full and fractional shares that the Fund may issue.

SERVICE PROVIDERS

     CUSTODIAN.  State  Street  Bank and Trust  Company,  225  Franklin  Street,
Boston,  Massachusetts  02110, serves as the Fund's custodian.  The custodian is
responsible for maintaining the Fund's assets and keeping all necessary accounts
and records of Fund assets.

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

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

                                      B-1
<PAGE>

CHARACTERISTICS OF THE FUND'S SHARES

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

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

     DIVIDEND  RIGHTS.  The shareholders of the Fund are entitled to receive any
dividends or other distributions  declared for the Fund. No shares have priority
or preference over any other shares with respect to distributions. Distributions
will be made from the assets of the Fund,  and will be paid  ratably to all Fund
shareholders  according  to the  number of 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 Fund's  shares;  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. Shareholders of the Fund 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.  In the  event of  liquidation,  shareholders  will be
entitled to receive a pro rata share of the Fund's net assets.

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

TAX STATUS OF THE FUND

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

                                      B-2
<PAGE>

                              INVESTMENT POLICIES

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

     REPURCHASE  AGREEMENTS.  The Fund may invest,  directly or  indirectly,  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 the Fund's
repurchase agreement  transactions  generally and has established guidelines and
standards for review by the investment  adviser of the  creditworthiness  of any
bank, broker, or dealer that is a party to a repurchase agreement with the Fund.

     The use of repurchase  agreements  involves certain risks. For example,  if
the other party to the agreement  defaults on its  obligation to repurchase  the
underlying  security at a time when the value of the security has declined,  the
Fund may incur a loss upon  disposition  of the security.  If the other party to
the agreement  becomes  insolvent and subject to liquidation  or  reorganization
under  bankruptcy  or other  laws,  a court may  determine  that the  underlying
security  is  collateral  for a loan by the Fund not within  the  control of the
Fund,  and  therefore  the  realization  by the Fund on such  collateral  may be
automatically  stayed.  Finally, it is possible that the Fund may not be able to
substantiate  its  interest  in the  underlying  security  and may be  deemed an
unsecured  creditor  of the other  party to the  agreement.  While  the  adviser
acknowledges  these risks,  it is expected that they can be  controlled  through
careful monitoring procedures.

     ILLIQUID  SECURITIES.  The Fund is permitted to invest up to 15% of its net
assets in illiquid securities. Illiquid securities are securities that cannot be
sold or disposed of in the ordinary  course of business  within  seven  business
days at approximately the value at which they are carried on the Fund's books.

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

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

     FOREIGN   INVESTMENTS.   The  Fund  is  authorized  to  invest  in  foreign
securities,  although  typically  the Fund has few,  if any,  foreign  holdings.
Investors should recognize that investing in foreign companies  involves certain
special   considerations  not  typically   associated  with  investing  in  U.S.
companies.

                                      B-3
<PAGE>

     Currency  Risk.  A fund that  holds  foreign  securities  will be  affected
favorably or unfavorably  by changes in currency  rates and in exchange  control
regulations,  and may incur costs in connection with conversions between various
currencies.  The Fund's  investment  policies  permit it to enter  into  forward
foreign currency  exchange  contracts in order to hedge any foreign holdings and
commitments against changes in the level of future currency rates.

     Country  Risk.  Because  foreign  companies  may not be  subject to uniform
accounting, auditing, and financial reporting standards and practices comparable
to those applicable to domestic companies,  there may be less publicly available
information  about certain  foreign  companies  than about  domestic  companies.
Securities of some foreign companies are generally less liquid and more volatile
than  securities  of  comparable  domestic  companies.  There is generally  less
government  supervision and regulation of foreign 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
investments in those countries.

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

     FUTURES  CONTRACTS AND OPTIONS.  Although it has no present intention to do
so, the Fund is authorized to enter into stock futures contracts,  options,  and
options on  futures  contracts  for the  following  reasons:  to  maintain  cash
reserves while  simulating full  investment,  to facilitate  trading,  to reduce
transaction  costs, or to seek higher investment returns when a futures contract
is priced  more  attractively  than the  underlying  equity  security  or index.
Futures  contracts  provide  for the future  sale by one party and  purchase  by
another party of a specified amount of a specific security at a specified future
time and at a specified price. While the Fund will incur commission  expenses in
both opening and closing out futures positions,  these costs typically are lower
than  transaction   costs  incurred  in  the  purchase  and  sale  of  portfolio
securities.

                                      B-4
<PAGE>

     Restrictions on the Use of Futures Contracts.  The Fund will not enter into
futures contract transactions to the extent that,  immediately  thereafter,  the
sum of its initial margin  deposits on open  contracts  exceeds 5% of the Fund's
total assets. In addition, the Fund will not enter into futures contracts to the
extent  that its  outstanding  obligations  to purchase  securities  under these
contracts would exceed 20% of the Fund's total assets.

     Risk Factors in Futures  Contracts.  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 Fund will
hold futures only for hedging purposes,  the investment adviser does not believe
that the Fund is subject to the risks of loss typically  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 a  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 a 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 a 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.

     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 certain  futures  contracts as of the end of the
year as well as those  actually  realized  during the year. In these cases,  any
gain or loss recognized  with respect to a futures  contract is considered to be
60%  long-term  capital  gain or loss and 40%  short-term  capital gain or loss,
without  regard to the  holding  period  of the  contract.  Gains and  losses on
certain other futures contracts  (primarily non-U.S.  futures contracts) are not
recognized  until the  contracts  are closed and are  treated  as  long-term  or
short-term  depending on the holding  period of the  contract.  Sales of futures
contracts  which  are  intended  to  hedge  against  a  change  in the  value of
securities  held by a Fund may affect the holding period of such securities and,
consequently,   the  nature  of  the  gain  or  loss  on  such  securities  upon
disposition.  A 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 a Fund to continue to qualify for Federal income tax treatment
as a  regulated  investment  company,  at least  90% of its gross  income  for a
taxable year must be derived from qualifying income; i.e., dividends,  interest,
income  derived from loans of  securities,  gains from the sale of securities or
foreign currencies, or other income derived with respect to the Fund's business


                                      B-5
<PAGE>

of investing in 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.

     A 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 transactions.

     LENDING OF SECURITIES.  Although there is little demand to borrow preferred
stock,  the Fund is authorized to lend its portfolio  securities on a short-term
or a long-term basis 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 portfolio  securities,  the Fund can increase its income through the receipt
of interest on the loan. Since income derived from lending portfolio  securities
is   not   qualifying   income   for   the   purpose   of   the   intercorporate
dividends-received  deduction  under  Federal tax law,  the Fund will limit such
activity in accordance  with its objective of maximizing  dividend  income which
qualifies  for the  deduction.  In any event,  the Fund will not lend  portfolio
securities if, as a result, the aggregate of such loans exceeds 10% of the value
of the  Fund's  total  assets.  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.

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

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


                             YIELD AND TOTAL RETURN

The yield of the  Vanguard  Preferred  Stock  Fund for the 30-day  period  ended
October 31, 1999 was 6.14%.

     The  average  annual  total  return  of the Fund for the one-,  five-,  and
ten-year  periods  ended  October  31,  1999  was  -2.47%,   9.63%,  and  8.92%,
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

                                      B-6
<PAGE>

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

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  specific  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 total assets of the Fund, less all liabilities, by the total number
of shares outstanding.  The net asset value is determined as of the close of the
New York Stock Exchange (the  Exchange),  generally  4:00 p.m.  Eastern time, on
each day that the Exchange is open for trading.

     Fund securities for which market quotations are readily available (includes
those  securities  listed on  national  securities  exchanges,  as well as those
quoted on the NASDAQ Stock Market) will be valued at the last quoted sales price
on the day the valuation is made.  Such  securities  which are not traded on the
valuation  date  are  valued  at the  mean  of the bid  and  ask  prices.  Price
information

                                      B-7
<PAGE>

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 debt instruments (those acquired 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.


                               PURCHASE OF SHARES

The Fund reserves the right in its sole  discretion  (i) to suspend the offering
of its shares, (ii) to reject purchase orders when in the judgment of management
such rejection is in the best interest of the Fund, and (iii) to reduce or waive
the minimum investment for, or any other restrictions on, initial and subsequent
investments for certain  fiduciary  accounts such as employee  benefit plans, or
under  circumstances  where  certain  economies  can be achieved in sales of the
Fund's shares.

TRADING SHARES THROUGH CHARLES SCHWAB

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

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


                              REDEMPTION OF SHARES

The Fund may suspend  redemption  privileges or postpone the date of payment (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.


                                      B-8
<PAGE>

     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.


                       FUNDAMENTAL INVESTMENT LIMITATIONS

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

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

     COMMODITIES.  The Fund may not invest in  commodities,  except  that it may
invest in stock futures contracts,  stock options,  and options on stock 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,  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,  except  that the Fund will invest more than 25% of
its total assets in the utilities and financial services industries.

     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
fixed-income  securities,  or by entering into  repurchase  agreements;  (ii) by
entering into collateralized repurchase agreements;  (iii) as provided under the
heading  "Lending of  Securities";  or (iv) 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.

     OPTIONS.  The Fund may not purchase or sell put or call options,  except as
permitted by the Fund's investment policies relating to commodities.

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

                                      B-9
<PAGE>

     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.

     None of these  limitations  prevents  the Fund  from  participating  in The
Vanguard Group,  Inc.  (Vanguard).  Because the Fund is a member of The Vanguard
Group of Investment  Companies,  it 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.

     The  investment  limitations  set forth  above are  considered  at the time
investment 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.


                             MANAGEMENT OF THE FUND

OFFICERS AND TRUSTEES

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

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

JOANN HEFFERNAN HEISEN (DOB: 1/25/1950), Trustee
Vice President, Chief Information Officer, and member of the Executive Committee
of Johnson & 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
Corporation.

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

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

                                      B-10
<PAGE>

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

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

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

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

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

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

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

THE VANGUARD GROUP

The Fund is a  member  of The  Vanguard  Group of  Investment  Companies,  which
currently  consists  of  more  than  100  funds.   Through  their  jointly-owned
subsidiary,  The  Vanguard  Group,  Inc.,  the Fund and the  other  funds in The
Vanguard  Group obtain  at-cost  virtually  all of their  corporate  management,
administrative,  and distribution  services.  Vanguard also provides  investment
advisory services on an at-cost basis to a number 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.

     Vanguard  adheres to a Code of Ethics  established  pursuant  to Rule 17j-1
under the 1940 Act.  The Code is  designed  to  prevent  unlawful  practices  in
connection  with the purchase or sale of securities by persons  associated  with
Vanguard.  Vanguard's Code of Ethics limits the ability of certain  Officers and
employees of Vanguard who are  considered  access  persons to engage in personal
securities  transactions.  Such  transactions  are  subject  to  procedures  and
guidelines   similar  to,  and  in  many  cases  more  restrictive  than,  those
recommended by a blue ribbon panel of mutual fund industry executives.

     Vanguard was  established and operates under an Amended and Restated Funds'
Service  Agreement which was approved by the  shareholders of each of the funds.
The amounts  which each of the funds has invested are adjusted from time to time
in order to maintain the proportionate relationship between each fund's relative
net assets and its contribution to Vanguard's capital.  The Amended and Restated
Funds'  Service  Agreement  provides as follows:  (1) each  Vanguard fund may be
called upon to invest a maximum of .40% of its  current net assets in  Vanguard,
and (2) there are no restrictions on the maximum  aggregate cash investment that
the Vanguard funds may make in

                                      B-11
<PAGE>

Vanguard.  At October 31, 1999, the Preferred Stock Fund had contributed capital
of $70,000 to Vanguard,  representing 0.02% of the Fund's net assets and 0.1% of
Vanguard's capitalization.

     MANAGEMENT.  Corporate management and administrative  services include: (1)
executive  staff;  (2) accounting and financial;  (3) legal and regulatory;  (4)
shareholder  account  maintenance;  (5)  monitoring  and  control  of  custodian
relationships;  (6)  shareholder  reporting;  and (7) review and  evaluation  of
advisory and other services provided to the funds by third parties.

     DISTRIBUTION.  Vanguard Marketing Corporation, a wholly-owned subsidiary of
The Vanguard Group, Inc., provides all distribution and marketing activities for
the funds in the Group. The principal distribution expenses are for advertising,
promotional materials,  and marketing personnel.  Distribution services may also
include  organizing  and offering to the public,  from time to time, one or more
new investment companies which will become members of Vanguard. The Trustees and
Officers of Vanguard  determine the amount to be spent annually on  distribution
activities,  the  manner and  amount to be spent on each  fund,  and  whether to
organize new investment companies.

     One half of the distribution expenses of a marketing and promotional nature
is allocated among the funds based upon their relative net assets. The remaining
one half of these  expenses is allocated  among the funds based upon each fund's
sales for the preceding 24 months  relative to the total sales of the funds as a
Group,   provided,   however,   that  no  fund's  aggregate  quarterly  rate  of
contribution  for  distribution  expenses of a marketing and promotional  nature
shall exceed 125% of the average  distribution  expense rate for  Vanguard,  and
that no fund shall incur annual distribution  expenses in excess of .20 of 1% of
its average month-end net assets.

     During the fiscal years ended October 31, 1997,  1998,  and 1999,  the Fund
incurred the following  approximate  amounts of The Vanguard Group's  management
(including transfer agency),  distribution,  and marketing  expenses:  $658,000,
$763,000, and $797,000, respectively.

INVESTMENT ADVISORY SERVICES

Vanguard  provides  investment  advisory services to several Vanguard funds (but
not to this Fund).  These services are provided on an at-cost basis from a money
management  staff  employed  directly by Vanguard.  The  compensation  and other
expenses of this staff are paid by the funds utilizing these services.

TRUSTEE COMPENSATION

The  same  individuals  serve  as  Trustees  of all  Vanguard  funds  (with  two
exceptions,  which are noted in the table appearing on page B-13), 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 in 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


                                      B-12
<PAGE>

Trustee to receive from all Vanguard funds upon retirement, and the total amount
of compensation paid to each Trustee by all Vanguard funds.

                          VANGUARD PREFERRED STOCK FUND
                          TRUSTEES' COMPENSATION TABLE

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

                                                                PENSION OR                            TOTAL
                                                                RETIREMENT                        COMPENSATION
                                                                 BENEFITS         ESTIMATED         FROM ALL
                                              AGGREGATE         ACCRUED AS         ANNUAL           VANGUARD
                                            COMPENSATION       PART OF THIS     BENEFITS UPON     FUNDS PAID TO
  NAMES OF TRUSTEES                       FROM THIS FUND(1) FUND'S EXPENSES(1)   RETIREMENT        TRUSTEES(2)
- ---------------------------------------------------------------------------------------------------------------
John C. Bogle (3). . . .                         None             None               None              None
John J. Brennan . . .                            None             None               None              None
Barbara Barnes Hauptfuhrer(4). . .                $12               $1            $15,000                $0
JoAnn Heffernan Heisen                            $70               $4            $15,000           $80,000
Bruce K. MacLaury . .                             $70               $6            $12,000           $75,000
Burton G. Malkiel . .                             $70               $6            $15,000           $80,000
Alfred M. Rankin, Jr.                             $70               $6            $15,000           $80,000
John C. Sawhill . . .                             $70               $6            $15,000           $80,000
James O. Welch, Jr. .                             $70               $6            $15,000           $80,000
J. Lawrence Wilson. .                             $70               $6            $15,000           $80,000
</TABLE>

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


                          INVESTMENT ADVISORY SERVICES

The Fund employs  Wellington  Management  Company,  LLP (the  Adviser)  under an
investment  advisory  agreement to manage the investment and reinvestment of the
assets of the Fund and to  continuously  review,  supervise,  and administer the
Fund's investment program. The Adviser discharges its  responsibilities  subject
to the control of the Officers and Trustees of the Fund.

     The  Fund  pays  the  Adviser  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:

                NET ASSETS                           ANNUAL RATE
                ----------                           -----------
                First $200 million.................     .150%
                Next $200 million..................     .100%
                Assets in excess of $400 million...     .075%

     During the fiscal  years ended  October 31, 1997,  1998 and 1999,  the Fund
incurred advisory fees of $406,000, $458,000, and $455,000, respectively.

     The Fund's agreement with the Adviser is renewable for successive  one-year
periods.  Each renewal must be  specifically  approved by a vote of the Board of
Trustees,  including the affirmative votes of a majority of the Trustees who are
not parties to the contract or "interested persons" (as defined in the 1940 Act)
of any such party.

                                      B-13
<PAGE>

     The Board of Trustees may,  without the approval of  shareholders,  provide
for:
- -    The employment of a new investment  adviser  pursuant to the terms of a new
     advisory agreement,  either as a replacement for the existing Adviser or as
     an additional adviser.
- -    A change in the terms of the advisory agreement.
- -    The continued employment of the existing Adviser after an assignment of the
     advisory agreement resulting from a change in control of the Adviser.

     Any such change will be communicated to shareholders in writing.

DESCRIPTION OF THE ADVISER

The Adviser is a Massachusetts limited liability partnership located at 75 State
Street, Boston,  Massachusetts 02109. The Adviser's managing partners are Robert
W. Doran,  Duncan M.  McFarland,  and John R. Ryan. As of October 31, 1999,  the
Adviser managed more than $224 billion in stock and bond funds, including all or
part of 14 Vanguard funds.


                             PORTFOLIO TRANSACTIONS

The investment  advisory agreement  authorizes the Adviser (with the approval of
the Board of  Trustees)  to select the brokers or dealers  that will execute the
purchases  and sales of  portfolio  securities  for the Fund,  and  directs  the
Adviser  to use its best  efforts to obtain  the best  available  price and most
favorable  execution  as to all  transactions  for the  Fund.  The  Adviser  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,  the Adviser 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. The Adviser considers such information useful in the performance of its
obligations,  but is unable to determine  the amount by which such  services may
reduce its expenses.

     The investment advisory agreement also incorporates the concepts of Section
28(e) of the Securities  Exchange Act of 1934 by providing that,  subject to the
approval  of the  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 and the other funds in the Group.

     Currently, it is the Fund's policy that the Adviser may at times pay higher
commissions  in  recognition  of  brokerage  services  felt  necessary  for  the
achievement  of  better  execution  of  certain  securities   transactions  that
otherwise  might  not be  available.  The  Adviser  will  only pay  such  higher
commissions  if it believes  this to be in the best  interest of the Fund.  Some
brokers or dealers who may receive such higher  commissions  in  recognition  of
brokerage  services  related to execution of  securities  transactions  are also
providers of research  information to the Adviser and/or the Fund. However,  the
Adviser has informed the Fund that it generally  will not pay higher  commission
rates specifically for the purpose of obtaining research services.

     During the fiscal years ended October 31, 1997 and 1998, the Fund paid $516
and $882 in brokerage  commissions,  respectively.  During the fiscal year ended
October 31, 1999, the Fund did not pay brokerage commissions.

                                      B-14
<PAGE>

     Some  securities  considered  for  investment  by  the  Fund  may  also  be
appropriate  for other Vanguard  funds and/or 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 funds or clients served by the Adviser are
considered at or about the same time,  transactions  in such  securities will be
allocated  among the several funds and clients in a manner  deemed  equitable by
the Adviser.  Although  there may be no specified  formula for  allocating  such
transactions,  the allocation methods used, and the results of such allocations,
will be subject to periodic review by the Fund's Board of Trustees.


                              FINANCIAL STATEMENTS

The Fund's  Financial  Statements as of and for the year ended October 31, 1999,
including  the  financial  highlights  for each of the five fiscal  years in the
period ended October 31, 1999,  appearing in the Vanguard  Preferred  Stock Fund
1999   Annual   Report   to   Shareholders,    and   the   report   thereon   of
PricewaterhouseCoopers LLP, independent accountants, also appearing therein, are
incorporated  by reference in this  Statement of Additional  Information.  For a
more complete discussion of the performance, please see the Fund's Annual Report
to Shareholders, which may be obtained without charge.


                              COMPARATIVE INDEXES

Vanguard may use reprinted  material  discussing The Vanguard Group, Inc. or any
of the member funds of The Vanguard Group of Investment Companies.

     Each of the  investment  company  members of Vanguard,  including  Vanguard
Preferred  Stock 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 for the S&P
SmallCap 600 Index which have a lower than average price-to-book ratio.

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

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

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

WILSHIRE 4500 EQUITY  INDEX--consists  of all stocks in the Wilshire 5000 except
for the 500 stocks in the Standard & Poor's 500 Index.

MORGAN  STANLEY  CAPITAL  INTERNATIONAL  EAFE  INDEX--is an  arithmetic,  market
value-weighted  average of the performance of over 900 securities  listed on the
stock exchanges of countries in Europe, Australia, Asia and the Far East.

                                      B-15
<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.

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 BBB- or better. The Index has a market
value of over $5 trillion.

LEHMAN BROTHERS MUTUAL FUND SHORT (1-5) GOVERNMENT/CORPORATE  INDEX--is a market
weighted  index that  contains  over 1,500  individually  priced U.S.  Treasury,
agency,  and  corporate  investment  grade  bonds  rated  BBB-  or  better  with
maturities between one and five years. The index has a market value of over $1.6
trillion.

LEHMAN BROTHERS MUTUAL FUND INTERMEDIATE (5-10) GOVERNMENT/CORPORATE INDEX--is a
market  weighted  index  that  contains  over  1,500  individually  priced  U.S.
Treasury,  agency, and corporate securities rated BBB- or better with maturities
between five and ten years. The index has a market value of over $800 billion.

LEHMAN  BROTHERS  LONG (10+)  GOVERNMENT/CORPORATE  INDEX--is a market  weighted
index that contains over 1,900 individually  priced U.S.  Treasury,  agency, and
corporate  securities  rated BBB- or better  with  maturities  greater  than ten
years. The index has a market value of over $1.1 trillion.

LEHMAN  LONG-TERM  TREASURY BOND INDEX--is a market weighted index that contains
individually  priced U. S. Treasury  securities  with maturities of ten years or
greater.

MERRILL LYNCH  CORPORATE & GOVERNMENT  BOND  INDEX--consists  of over 4,500 U.S.
Treasury, Agency and investment grade corporate bonds.

LEHMAN   CORPORATE   (BAA)  BOND   INDEX--all   publicly   offered   fixed-rate,
nonconvertible  domestic  corporate bonds rated Baa by Moody's,  with a maturity
longer  than one year and with more than $100  million  outstanding.  This index
includes over 1,500 issues.

LEHMAN  BROTHERS  LONG-TERM  CORPORATE  BOND  INDEX--is  a subset of the  Lehman
Corporate  Bond Index  covering  all  corporate,  publicly  issued,  fixed-rate,
nonconvertible  U.S.  debt issues rated at least Baa, with at least $100 million
principal outstanding and maturity greater than ten years.

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

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

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

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

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

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

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

                                      B-16
<PAGE>

                APPENDIX--DESCRIPTION OF PREFERRED STOCK RATINGS

Excerpts from Moody's Investors  Service,  Inc.  description of its four highest
preferred stock ratings:

     aaa--considered to be a top-quality  preferred stock. This rating indicates
good asset  protection  and the least  risk of  dividend  impairment  within the
universe of preferred stocks.

     aa--considered  a high-grade  preferred  stock.  This rating indicates that
there is reasonable  assurance  that earnings and asset  protection  will remain
relatively well maintained in the foreseeable future.

     a--considered to be an upper-medium  grade preferred stock. While risks are
judged to be somewhat  greater than in the aaa and aa  classifications,  earning
and asset  protection are,  nevertheless,  expected to be maintained at adequate
levels.

     baa--considered  to be  lower-medium  grade,  neither highly  protected nor
poorly secured. Earnings and asset protection appear adequate at present but may
be questionable over any great length of time.

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

     Quality ratings are expressed by symbols like those rating bonds.  They are
independent of Standard & Poor's bond ratings,  however,  in the sense that they
are not necessarily  graduated  downward from the rankings  accorded the issuing
company's debt. They represent a considered judgment of the relative security of
dividends,  and--what is thereby implied--the prospective yield stability of the
stock.  The four  highest  ratings are  AAA--Prime;  AA--High  Grade;  A--Sound;
BBB--Medium Grade.

                                      B-17

<PAGE>

























































                                                          SAI038-PREFERRED STOCK

                                      B-18


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