VANGUARD PREFERRED STOCK FUND
485APOS, 1998-11-30
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<PAGE>
 
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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.  [X]
                      
                   POST-EFFECTIVE AMENDMENT NO. 38 [X]     
 
                                      AND
 
                  REGISTRATION STATEMENT (NO. 811-2601) UNDER
                      THE INVESTMENT COMPANY ACT OF 1940
                              
                           AMENDMENT NO. 42 [X]     
 
                         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 January 29, 1999, pursu-
ant to paragraph (3) of Rule 485(a).     
 
  Approximate Date of Proposed Public Offering: As soon as practicable after
this Registration Statement becomes effective.
   
  We have elected to register an indefinite number of shares pursuant to Rule
24f-2 under the Investment Company Act of 1940. We filed our Rule 24f-2 Notice
for the fiscal year ended October 31, 1998 on   .  .     
 
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<PAGE>
 
                         VANGUARD PREFERRED STOCK FUND
 
                             CROSS REFERENCE SHEET
 
<TABLE>   
<CAPTION>
  FORM N-1A
 ITEM NUMBER                                        LOCATION IN PROSPECTUS
 <C>         <C>                                    <S>
  Item 1.    Front and Back Cover Pages............ Front and Back Cover Pages
  Item 2.    Risk/Return Summary: Investments,
             Risks, and Performance................ Fund Profile
  Item 3.    Risk/Return Summary: Fee Table........ Fee Table
  Item 4.    Investment Objectives, Principal     
             Investment Strategies, and Related    
             Risks................................. A Word About Risk; Who
                                                    Should Invest; Primary
                                                    Investment Strategies
  Item 5.    Management's Discussion of Fund
             Performance .......................... Herein incorporated by
                                                    reference to Registrant's
                                                    Annual Report to
                                                    Shareholders dated October
                                                    31, 1998 filed with the
                                                    Securities and Exchange
                                                    Commission's EDGAR system
                                                    on November 30, 1998.
  Item 6.    Management, Organization, and Capital
             Structure............................. The Fund and Vanguard;
                                                    Investment Adviser
  Item 7.    Shareholder Information............... Share Price; Dividends,
                                                    Capital Gains, and Taxes;
                                                    Investing with Vanguard
  Item 8.    Distribution Arrangements............. Not Applicable
  Item 9.    Financial Highlights Information...... Financial Highlights
<CAPTION>
  FORM N-1A                                         LOCATION IN STATEMENT
 ITEM NUMBER                                        OF ADDITIONAL INFORMATION
 <C>         <C>                                    <S>
  Item 10.   Cover Page and Table of Contents...... Cover Page; Table of
                                                    Contents
  Item 11.   Fund History.......................... Description of the Trust
  Item 12.   Description of the Fund and its
             Investments and Risks ................ Investment Policies;
                                                    Description of the Trust;
                                                    and Fundamental Investment
                                                    Limitations
  Item 13.   Management of the Fund ............... Management of the Trust
  Item 14.   Control Persons and Principal Holders
             of Securities ........................ Management of the Trust
  Item 15.   Investment Advisory and Other         
             Services ............................. Investment Advisory
                                                    Services
  Item 16.   Brokerage Allocation and Other
             Practices ............................ Portfolio Transactions
  Item 17.   Capital Stock and Other Securities ... Description of the Trust
  Item 18.   Purchase, Redemption, and Pricing
             of Shares ............................ Purchase of Shares;
                                                    Redemption of Shares; and
                                                    Share Price
  Item 19.   Taxation of the Fund ................. Description of the Trust
  Item 20.   Underwriters ......................... Not Applicable
  Item 21.   Calculation of Performance Data ...... Yield and Total Return
  Item 22.   Financial Statements ................. Financial Statements
</TABLE>    
<PAGE>

     
Vanguard Preferred Stock Fund
Prospectus
January 29, 1999
A Preferred Stock Mutual Fund

                  --------------------------------------------------------------
   Contents
                  --------------------------------------------------------------

1 Fund Profile                              10 Financial Highlights

3 Additional Information                    11 Investing with Vanguard

3 A Word About Risk                         11 Services and Account Features

3 Who Should Invest                         12 Types of Accounts

4 Primary Investment Strategies             12 Buying Shares

6 The Fund and Vanguard                     14 Redeeming Shares

7 Investment Adviser                        16 Transferring Registration

7 Year 2000 Challenge                       16 Fund and Account Updates

8 Dividends, Capital Gains, and Taxes       Glossary (inside back cover)

9 Share Price


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

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.

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




Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
accuracy or adequacy of this prospectus. Any representation to the contrary is a
criminal offense.
<PAGE>

                                                                   1
Fund Profile

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

INVESTMENT OBJECTIVE

The Fund seeks to provide the maximum dividend income that 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 corporations.)

     Note: Because the dividends-received deduction is available only for
corporations, the Fund may not be a suitable investment for individual and other
non-corporate investors.

INVESTMENT STRATEGIES
The Fund invests primarily in dividend-paying, investment-grade cumulative
preferred stocks.

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.

*    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 90% of the Fund's holdings typically are invested in the
     financial-services and utility industries, the Fund's performance can be
     significantly affected, for better or for worse, by developments in those
     industries.

*    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. 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.

*    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.

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 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 necessarily
indicate how it will perform in the future.

   -------------------------------------------------------------------------
                             Annual Total Returns
   -------------------------------------------------------------------------



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

During the period shown in the bar chart, the highest return for a calendar
quarter was *% (quarter ending____ ) and the lowest return for a quarter was -*%
(quarter ending________ ).
                                       1
<PAGE>

2

<TABLE> 
<CAPTION> 
              Average Annual Total Returns For Years Ended December 31, 1998
     -------------------------------------------------------------------------------------
                                                          1 Year        5 Years   10 Years
     -------------------------------------------------------------------------------------
<S>                                                       <C>          <C>        <C> 
     Vanguard Preferred Stock Fund                          * %        * %        * %
     Merrill Lynch DRD-Eligible Preferred Stock Index       *          *          *
     -------------------------------------------------------------------------------------
</TABLE> 

 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, overtime, have
a dramatic effect on a fund's performance.

 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 1998 was
*%, or $* per $1,000 of average net assets. The average growth equity mutual
fund had expenses in 1998 of *%, or $* per $1,000 of average net assets,
according to Lipper Analytical Services, which reports on the mutual fund
industry.

FEES AND EXPENSES

The following table describes the fees and expenses you would 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, 1998.

Shareholder fees(fees paid directly from your investment)

Sales Charge (Load) Imposed on Purchases:                  None
Sales Charge (Load) Imposed on Reinvested Dividends:       None
Redemption Fees:                                           None
Exchange Fees:                                             None

Annual Fund Operating Expenses (expenses deducted from the Fund's assets)
Management(Administrative and Investment Advisory) Expenses:         *%
12b-1 Distribution Fees:                                           None
Other Expenses(Marketing, Taxes, Auditing, etc.):                    *%
  Total Operating Expenses(Expense Ratio):                           *%

     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 are turn 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.

- --------------------------------------------------
1Year       3Years       5Years       10Years
- --------------------------------------------------
$*           $*           $*           $*
- --------------------------------------------------

     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.

                                       2
<PAGE>

                                                                   3

 Additional Information
<TABLE> 
<S>                                                         <C> 
 Dividends and Capital Gains                                Minimum Initial Investment
 Paid quarterly in March, June, September, and December;    $3,000
 capital gains, if any, are paid in December                Newspaper Abbreviation
 Investment Adviser                                         Prefd 
 Wellington Management Company, LLP, Boston, Mass,          Vanguard Fund Number
 since_____                                                 038
 Inception Date                                             Cusip Number
 December 3, 1975                                           92204P204
 Net Assets as of October 31, 1998                          Ticker Symbol
 $ * billion                                                VQIIX
 Suitable for IRAs
 No
</TABLE> 

- --------------------------------------------------------------------------------
A Word About Risk

This prospectus describes the 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 [GRAPHIC OF FLAG APPEARS HERE] 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 a corporation eligible for the federal dividends-received
     deduction. (Note: Subchapter S corporations are not eligible for this
     deduction.)

     * Individual and other non-corporate investors are unable to use the
       dividends-received deduction and therefore are not fully compensated on
       an after-tax basis for the interest and credit risks they assume by
       investing in the Fund.

*    You are seeking a high level of income from your investments and can
     tolerate sharp, sometimes substantial price fluctuations due to changes in
     interest rates.

*    You wish to add a preferred stock fund to your existing holdings.

                                  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.

  The Vanguard funds do not permit market-timing. Do not invest in this Fund if
you are a market-timer.

                                       3
<PAGE>

  4
     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 could disrupt the efficient
     management of the Fund. A purchase request could be rejected because of the
     timing of the request 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 of providing the maximum dividend income that qualifies
for the federal dividends-received deduction (DRD). It also explains how the
adviser implements these strategies. This Fund's Board of Trustees oversees the
management of the Fund, and may change the investment strategies in the interest
of shareholders.
  In addition, this section discusses several important risks--interest rate
risk, 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 predominately in dividend-paying, investment-grade, cumulative
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 on its common stock
and that preferred stockholders are ahead of common stockholders in their claims
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 that 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.
  Because Vanguard Preferred Stock Fund's holdings are not identical to the
Merrill Lynch DRD-Eligible Preferred Stock Index , the Standard & Poor's 500
Composite Stock Price Index, or any other market index, the performance of the
Fund will not mirror the returns of any particular index.

[GRAPHIC OF FLAG APPEARS HERE] 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.

  Because the Fund invests primarily in perpetual preferred stocks, the
 fluctuations in its market value in response to changing interest rates will
 generally be wider than those of long-term corporate or government bonds with
 maturities ranging from 15 to 30 years. As an illustration of interest rate
 risk, the table below shows the effect of a 1% and a 2% change in interest
 rates on the prices of long-term bonds:

                                       4
<PAGE>

                                                                               5
     ---------------------------------------------------------------------------
                               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) 
     ---------------------------------------------------------------------------
     *Assumes a 5.5% yield.
     ---------------------------------------------------------------------------

  This 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 be representative of future or current 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
credit-worthiness of each security and the issuer's ability to make dividend
payments on its preferred stock. Although preferred stocks usually carry lower
credit ratings than ordinary corporate bonds, 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."

[GRAPHIC OF FLAG APPEARS HERE] 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.

 PLAIN TALK ABOUT

  Fund Diversification and Concentration

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 concentrated 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.

  Because most investment-grade preferred stocks are issued by companies within
only a few industries, particularly financial-services and utilities, it is
difficult to achieve diversification across industry groups. Although the Fund's
adviser strives to maintain exposure to other industries, the Fund invests more
than 25% of its assets in each of two industries--utilities and financial
services--that are the main issuers of preferred stocks. The profitability of
both industries is heavily influenced by the level of interest rates, by
changing regulatory environments, and by intensifying competition. 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. Factors that can harm the performance of
financial-services companies include fluctuations in the economy that reduce the
demand for services and may reduce the ability of borrowers to pay their debts.

[GRAPHIC OF FLAG APPEARS HERE] 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 90%) are invested in two
    industries--financial services and utilities--its performance can be
    significantly affected, for better or for worse, by developments in those
    industries.

  As of October 31, 1998, the Fund had invested * % of net assets in its top ten
holdings.

[GRAPHIC OF FLAG APPEARS HERE] The Fund is subject to manager risk, which is the
    chance that the adviser may do a poor job of selecting preferred stocks.

                                       5
<PAGE>

  6
  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.

[GRAPHIC OF FLAG APPEARS HERE] 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.

  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 would decline to
compensate for the higher tax corporate investors would have to pay on the
dividends.

 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. (These costs are in addition to those described in the
fee table on page 2.) 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. The average turnover rate for all domestic stock funds is
approximately *%.

Turnover Rate
Although the Fund generally seeks to invest for the long term, it may sell
securities regardless of how long the securities have been held. The Fund's
average turnover rate for the past five years has been about *%. (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.)

Temporary Defensive Measures
The Fund may, from time to time, take temporary defensive measures--such as
holding cash reserves without limit--that are inconsistent with the Fund's
primary investment strategies, in response to adverse market, economic,
political, or other conditions. In taking such measures, the Fund may not
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 distinct investment portfolios holding assets worth
more than $.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.

                                       6
<PAGE>

                                                                               7
 PLAIN TALK ABOUT

The Fund's Adviser

Wellington Management Company is an investment advisory firm
founded in 1928. As of October 31, 1998, Wellington managed more than $* billion
in stock and bond funds, including all or part of 13 Vanguard funds. The manager
responsible for overseeing the implementation of WMC's strategy for Vanguard
Preferred Stock Fund is: Earl E. McEvoy, Managing Director of WMC and adviser to
the Fund since 1982; has worked in investment management since 1972; with WMC
since 1978; B.A., Dartmouth College; M.B.A., Columbia Business School.


Investment Adviser

The Fund employs Wellington Management Company, LLP ("WMC"), 75 State Street,
Boston, MA 02109, as its investment adviser. WMC manages the Fund subject to the
control of the Trustees and officers of the Fund.
  WMC'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 year ended October 31, 1998, the investment advisory fee paid to WMC
was $ * million, which represented an effective annual rate of *% of the Fund's
average net assets.
  The Fund has authorized WMC 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, WMC may choose
brokers who charge higher commissions. If more than one broker can obtain the
best available price and favorable execution of a transaction, then WMC is
authorized to choose a broker who, in addition to executing the transaction,
will provide research services to WMC or the Fund. Also, the Fund may direct WMC
to use a particular broker for certain transactions in exchange for commission
rebates or research services provided to the Fund. However, WMC will not pay
 higher commissions specifically for the purpose of obtaining research
services.
  The Board of Trustees may, without prior approval from shareholders, change
the terms of the advisory agreement between the Fund and WMC, or hire a new
investment adviser, either as a replacement for WMC or as an additional adviser.
Any such change will be communicated to shareholders in writing.

Year 2000 Challenge

The common practice in computer programming of using just two digits to identify
a year has resulted in the Year 2000 challenge throughout the information
technology industry. If unchanged, many computer applications and systems could
misinterpret dates occurring after December 31, 1999, leading to errors or
failure. Such failure could adversely affect a fund's operations, including
pricing, securities trading, and the servicing of shareholder accounts.
  The Vanguard Group is dedicated to providing uninterrupted, high-quality
performance from our computer systems before, during, and after 2000. In July
1998, we completed the renovation and initial testing of our internal systems.
Vanguard is diligently working with external partners, suppliers, and vendors,
including fund managers and other service providers, to assure that the systems
with which we interact remain operational at all times.
  In addition to taking every reasonable step to secure our internal systems and
external relationships, Vanguard is further developing contingency plans
intended to assure that unexpected systems failures will not adversely affect
the Fund's operations. Vanguard intends to monitor these processes through the
rollover of 1999 into 2000 and to quickly implement alternate solutions if
necessary.
  However, despite Vanguard's efforts and contingency plans, noncompliant
computer systems could have a material adverse effect on the Fund's business,
operations, or financial condition. Additionally, the Fund's performance could
be hurt if a computer-system failure at a company or governmental unit affects
the price of securities the Fund owns.

                                       7
<PAGE>

8

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. The capital gains are either short-term or long-term depending on
whether the fund held the securities for less than or more than one year.

Dividends, Capital Gains, and Taxes

Each March, June, September, and December, the Fund distributes to shareholders
virtually all of its income from interest and dividends. Any capital gains
realized from the sale of its holdings will be distributed in December. You can
receive distributions of income or capital gains in cash, or you can have them
automatically invested in more shares of the Fund. In either case, these
distributions are taxable to you unless you hold your shares in a tax-deferred
retirement account. It is important to note that distributions of dividends and
capital gains that are declared in December--if paid to you by the end of
January--are taxed as if they had been paid to you in December.
  Vanguard will send you a statement each year showing the tax status of all
your distributions. If you have chosen to receive dividend and/or capital gains
distributions in cash, and the postal or other delivery service is unable to
deliver checks to your address of record, we will change the distribution option
so that all dividends and other distributions are automatically invested in
additional shares. We will not pay interest on uncashed distribution checks. 

* The dividends and short-term capital gains distributions that you receive are
  considered ordinary income for tax purposes.
* Any distributions of net long-term capital gains by the Fund are taxable to
  you as long-term capital gains, no matter how long you've owned shares in the
  Fund.
* Although the Fund does not seek to realize any particular amount of capital
  gains during a year, such gains are realized from time to time as by-products
  of its ordinary investment activities. Consequently, distributions may vary
  considerably from year to year.
* If you sell or exchange shares, any gain or loss you have 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.
* Distributions of dividends or capital gains, and capital gains or losses from
  your sale or exchange of Fund shares, may be subject to state and local income
  taxes as well. 
  The tax information in this prospectus is provided as general information and
will not apply to you if you are investing through a tax-deferred account such
as an IRA or a qualified employee benefit plan. You should consult your tax
adviser about the tax consequences of an investment in the Fund.

                                       8
<PAGE>

                                                                            9

                               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 trading on the New York Stock Exchange (the NAV
is not calculated on holidays or other days 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>

  10

  PLAIN TALK ABOUT

 How to Read the Financial 
     Highlights Table

The Fund began fiscal 1998 with a net asset value (price) of $ . per share.
During the year, the Fund earned $. per share from investment income (interest
and dividends) and $ . per share from investments that had appreciated in value
or that were sold for higher prices than the Fund paid for them. 

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

  The earnings ($ . per share) minus the distributions ($ . per share) resulted
in a share price of $ . at the end of the year. This was an increase of $ . per
share (from $ . at the beginning of the year to $ . 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 . % for the year.

  As of October 31, 1998, the Fund had $ . billion in net assets. For the year,
its expense ratio was . % ($ . per $1,000 of net assets); and its net investment
income amounted to . % of its average net assets. It sold and replaced
securities valued at . % of its net assets.

Financial Highlights

The following financial highlights table is intended to help you understand the
Fund's financial performance for the past five years, and reflects financial
results for a single Fund share. The total returns in the table represent the
rate that an investor would have earned each year on an investment in the Fund
(assuming reinvestment of all dividends and distributions). This information has
been 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.


     FINANCIAL HIGHLIGHTS TABLE TO COME





"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>

                                                                           11

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 [GRAPHIC OF BOOK APPEARS HERE]. 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 the Fund unless you notify us otherwise.
- --------------------------------------------------------------------------------
Vanguard Direct Deposit Service/(TM)/ [GRAPHIC OF BOOK APPEARS HERE]
Automatic method for depositing your paycheck or U.S. government payment
(including Social Security and government pension checks) into your account.
- --------------------------------------------------------------------------------
Vanguard Automatic Exchange Service/(TM)/ [GRAPHIC OF BOOK APPEARS HERE]
Automatic method for moving a fixed amount of money from one Vanguard fund
account to another. 
- --------------------------------------------------------------------------------
Vanguard Fund Express/(R)/ [GRAPHIC OF BOOK APPEARS HERE]
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)/ [GRAPHIC OF BOOK APPEARS HERE]
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 [GRAPHIC OF BOOK APPEARS HERE]
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 fund shares. 
- --------------------------------------------------------------------------------
Access Vanguard/(R)/ www.vanguard.com  [GRAPHIC OF PC APPEARS HERE]
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 the website. We will then send
to you, by mail, 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.
 . Add/change fund options (including dividend options, Vanguard
  Fund Express(R), bank instructions, checkwriting, and Vanguard Automatic 
  Exchange Service/(TM)/).
/(*)/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: 1-800-662-2738
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.
- --------------------------------------------------------------------------------
<PAGE>

  12

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 [GRAPHIC OF BOOK APPEARS HERE]
Invest assets held in an existing personal trust.
- --------------------------------------------------------------------------------
For an Organization [GRAPHIC OF BOOK APPEARS HERE]
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.
- --------------------------------------------------------------------------------
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 account whose balance falls below the
minimum initial investment. The Fund will deduct a $10 annual fee in June if
your account balance falls below $2,500. The fee is waived if your total
Vanguard account assets are $50,000 or more. 
- --------------------------------------------------------------------------------
By Mail to . . . [GRAPHIC OF ENVELOPE APPEARS HERE]
open a new account
Complete and sign the application 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.

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 2600                     455 Devon Park Drive
Valley Forge, PA 19482-2600       Wayne, PA 19087-1815
<PAGE>

                                                                           13
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 . . . [GRAPHIC OF TELEPHONE APPEARS HERE]
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).

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). Use Vanguard
Fund Express (see "Services and Account Features") to transfer assets from your
bank account. Call Client Services before your first use to verify that this
option is in place.

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've requested 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 [GRAPHIC OF WIRE 
Call Client Services to arrange your wire transaction.        APPEARS HERE]

Wire to:
FRB ABA 021001088
Marine Midland Bank, New York

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]
[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.
 Keep in mind that if you buy or sell Fund shares through a registered
broker/dealer or investment adviser, the broker/dealer or adviser may charge you
a service fee. 
- --------------------------------------------------------------------------------
A Note on Large Purchases 
It is important that you call Vanguard before you invest a large dollar amount.
We must consider the interests of all Fund shareholders and so reserve the right
to refuse any purchase that will disrupt the Fund's operation or performance.
- --------------------------------------------------------------------------------

<PAGE>

   14

Redeeming Shares

The ability to redeem (that is, sell or exchange) Fund shares by telephone is
automatically established 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:
[X]  The ten-digit account number.
[X]  The name and address exactly as registered on the account.
[X]  The primary Social Security or employer identification number as registered
     on the account.
[X]  The Personal Identification Number, if applicable.
 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.

HOW TO SELL SHARES
You can withdraw any part of your account, at any time, by selling shares. Sale
proceeds are normally mailed within two business days after Vanguard receives
your request. Proceeds of wire redemptions are sent to your bank one business
day after Vanguard or its appointed agent receives your request. The sale price
of your shares will be the Fund's next-determined net asset value after Vanguard
receives all required documents in good order.
 Good order means that the request includes:
[X]  Fund name and account number.
[X]  Amount of the transaction (in dollars or shares).
[X]  Signatures of all owners exactly as registered on the account.
[X]  Signature guarantees (if required).
[X]  Any supporting legal documentation that may be required.
[X]  Any certificates you are holding for the account.
 Sale or exchange requests received after the close of trading on the Exchange
are processed at the next business day's net asset value. No interest will
accrue on amounts represented by uncashed redemption checks. The Fund will not
cancel any trade (e.g., purchase, redemption, or exchange) believed to be
authentic, once the trade request has been received in writing or by telephone
with a confirmation number assigned. 
- --------------------------------------------------------------------------------
Note: Some written requests (such as those requesting that redemptions be paid
to a different payee or address than that of the account owner) require a
signature guarantee from a bank, broker, or other acceptable financial
institution. A notary public cannot provide a signature guarantee.
- --------------------------------------------------------------------------------

HOW TO EXCHANGE SHARES
An exchange is the selling of shares of one Vanguard fund to purchase shares of
another. Although we make every effort to maintain the exchange privilege,
Vanguard reserves the right to revise or terminate the exchange privilege, limit
the amount of an exchange, or reject any exchange, at any time, without notice.
 Because excessive exchanges can disrupt the management of the Fund and increase
transaction costs, Vanguard limits exchange activity to two substantive exchange
redemptions (at least 30 days apart) from the Fund during any 12-month period.
"Substantive" means either a dollar amount or a series of movements between
Vanguard funds that Vanguard determines, in its sole discretion, could adversely
affect the management of a Fund.
 Before you exchange into a new Vanguard fund, be sure to read its prospectus.
- --------------------------------------------------------------------------------
Selling or Exchanging Shares by Mail [GRAPHIC OF ENVELOPE APPEARS HERE]
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

<PAGE>

                                                                           15

written instructions that include the guaranteed signatures of all current
account owners of the fund from which you wish to redeem.

First-class mail to:              Express or Registered mail to:
The Vanguard Group                The Vanguard Group
P.O. Box 2600                     455 Devon Park Drive
Valley Forge, PA 19482-2600       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
- --------------------------------------------------------------------------------
Selling or Exchanging Shares by Telephone [GRAPHIC OF TELEPHONE APPEARS HERE]
Call Vanguard Tele-Account/*/ 24 hours a day--or Client Services during business
hours--to sell or exchange shares. You can exchange shares from the Fund to open
an account in another Vanguard fund or to add to an existing Vanguard fund
account with an identical registration.

Vanguard Tele-Account             Client Services
1-800-662-6273                    1-800-662-2739
- --------------------------------------------------------------------------------
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. 
- --------------------------------------------------------------------------------
Selling or Exchanging Shares Online [GRAPHIC OF PC APPEARS HERE]
Access Vanguard 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 the website. We will then send you, by mail, an account access password
that will enable you to sell or exchange shares online (as well as perform other
transactions).
 Note: 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, Vanguard
Total International Stock 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. 
- --------------------------------------------------------------------------------
A Note on Large Redemptions 
It is important that you call Vanguard before you redeem a large dollar amount.
We must consider the interests of all Fund shareholders and so reserve the right
to delay delivery of your redemption proceeds--up to seven days--if the amount
will disrupt the Fund's operation or performance.
 If you redeem more than $250,000 worth of the Fund's 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>

   16

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 clear, concise account and tax statements to help you keep
track of your Fund account throughout the year as well as when you are preparing
your income tax returns.
 In addition, you will receive financial reports about the Fund twice a year.
These comprehensive reports include an assessment of the Fund's performance (and
a comparison to its industry benchmark), an overview of the markets, a report
from the advisers, a listing of the Fund's holdings, and other financial
statements.
 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 we find that 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, however, you may notify our Investor
Information Department at 1-800-662-7447. 
- --------------------------------------------------------------------------------
Confirmation Statement 
Sent each time you buy, sell, or exchange shares; confirms the trade date and
the amount of your transaction.
- --------------------------------------------------------------------------------
Portfolio Summary [GRAPHIC OF BOOK APPEARS HERE]
Mailed quarterly for most accounts; shows the market value of your account at
the close of the statement period, as well as distributions, purchases, sales,
and exchanges for the current calendar year.
- --------------------------------------------------------------------------------
Fund Financial Reports 
Mailed in January and July for the Fund. 
- --------------------------------------------------------------------------------
Tax Statements
Generally mailed in January; report previous year's taxable distributions and
proceeds from the sale of shares. 
- --------------------------------------------------------------------------------
Average Cost Review Statement 
Issued quarterly for most taxable accounts (accompanies your Portfolio Summary);
shows the average cost of shares that you redeemed during the calendar year,
using the average cost single category method.
- --------------------------------------------------------------------------------

<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 your own 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>
 
                [LETTERHEAD OF THE VANGUARD GROUP APPEARS HERE]



For More Information 
If you'd like more information about Vanguard Preferred Stock Fund, the
following documents are available free upon request:

Annual/Semiannual Report to Shareholders 
Additional information about the Fund's investments is available in the Fund's
annual and semiannual reports to shareholders. In these reports, you will find a
discussion of the market conditions and investment strategies that significantly
affected the Fund's performance during the most recent fiscal year.

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

E-mail: [email protected]

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: 1-800-662-2738

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, D.C. 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 20549-6009.

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



(C) 1999 Vanguard Marketing Corporation, Distributor. All rights reserved.

P038N-01/29/1999
     
<PAGE>
 
                                    PART B
 
                         VANGUARD PREFERRED STOCK FUND
                                 
                              (THE "TRUST")     
 
                      STATEMENT OF ADDITIONAL INFORMATION
                                
                             JANUARY 29, 1999     
   
  This Statement is not a prospectus, but should be read in conjunction with
the Trust's current Prospectus (dated January 29, 1999). To obtain the
Prospectus please call the Investor Information Department:     
 
                                1-800-662-7447
 
                               TABLE OF CONTENTS
 
<TABLE>   
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Description of the Trust...................................................  B-1
Investment Policies........................................................  B-3
Yield and Total Return.....................................................  B-6
Share Price................................................................  B-6
Purchase of Shares.........................................................  B-6
Redemption of Shares.......................................................  B-7
Fundamental Investment Limitations.........................................  B-8
Management of the Trust.................................................... B-10
Investment Advisory Services............................................... B-13
Portfolio Transactions..................................................... B-14
Financial Statements....................................................... B-16
Performance Measures....................................................... B-17
Appendix--Description of Preferred Stock Ratings........................... B-19
</TABLE>    
                            
                         DESCRIPTION OF THE TRUST     
   
ORGANIZATION     
   
  The Trust was originally organized as a Maryland corporation in 1975. In
1984 the Trust was reorganized into a Pennsylvania business trust, and on May
29, 1998 was again reorganized into a Delaware business trust. The Trust is
registered with the United States Securities and Exchange Commission ("SEC")
under the Investment Company Act of 1940 as an open-end, diversified manage-
ment investment company. It currently offers one Fund: Vanguard Preferred
Stock Fund (the "Fund"). There is no limit on the number of full and frac-
tional shares that the Fund may issue.     
   
SERVICE PROVIDERS     
   
  CUSTODIAN. State Street Bank and Trust Company, 225 Franklin Street, Boston,
Massachusetts 02110, serves as the Trust's custodian. The custodian is respon-
sible for maintaining the Fund's assets and keeping all necessary accounts and
records.     
   
  INDEPENDENT PUBLIC ACCOUNTANT. PricewaterhouseCoopers LLP, 30 South 17th
Street, Philadelphia, Pennsylvania 19103, serves as the Trust's independent
public accountant. The accountant audits financial statements for the Trust
and provides 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 Trust is organized under Delaware law, which pro-
vides that shareholders of a business trust are entitled to the same limita-
tions of personal liability as shareholders of a corporation organized under
Delaware law. Effectively, this means that a shareholder of the Trust 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 prior-
ity or preference over any other shares with respect to distributions. Distri-
butions 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 Investment Company Act of 1940; (ii)
the matter concerns an amendment to the Declaration of Trust that would ad-
versely 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 Investment Company Act of 1940 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 Trust's net assets, and to change any fundamental policy of the Trust.
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 of shareholders.     
   
  LIQUIDATION RIGHTS. In the event of liquidation, shareholders will be enti-
tled to receive a pro rata share of the net assets of the Fund.     
   
  PREEMPTIVE RIGHTS. There are no preemptive rights associated with the Fund.
       
  CONVERSION RIGHTS. There are no conversion rights associated with the Fund.
       
  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 are fully paid and non-assessable.
       
TAX STATUS OF THE FUND     
   
  The Fund qualifies 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 tax-
able 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
share-      
 
B-2
<PAGE>
 
   
holders as ordinary income. In addition, the Fund could be required to recog-
nize unrealized gains, pay substantial taxes and interest, and make substan-
tial distributions before regaining its tax status as a regulated investment
company.     
                              
                           INVESTMENT POLICIES     
 
  The following policies supplement the Fund's investment objective and poli-
cies 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 re-
purchase agreement is an agreement under which the Fund acquires a money mar-
ket instrument (generally a security issued by the U.S. Government or an
agency thereof, a banker's acceptance or a certificate of deposit) from a com-
mercial 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 re-
flects 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 in-
strument. In these transactions, the securities acquired by the Fund (includ-
ing 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 re-
purchased. In addition, the Trust's Board of Trustees monitors the Fund's re-
purchase 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 un-
derlying security at a time when the value of the security has declined, the
Fund may incur a loss upon disposition of the security. If the other party to
the agreement becomes insolvent and subject to liquidation or reorganization
under the Bankruptcy Code or other laws, a court may determine that the under-
lying 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 Fund's man-
agement 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 se-
curities. Illiquid securities are securities that cannot be sold or disposed
of in the ordinary course of business within seven business days at approxi-
mately the value at which they are carried on the Fund's books.     
   
  The Fund may invest in restricted, privately placed securities that, under
SEC rules, 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 Trust's Board of Trustees. While the Fund's invest-
ment adviser determines the liquidity of restricted securities on a daily ba-
sis, the Board oversees and retains ultimate responsibility for the adviser's
decisions. Several factors the     
 
                                                                            B-3
<PAGE>
 
   
Board considers in monitoring these decisions include the valuation of a secu-
rity, 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.     
   
  CURRENCY RISK. A fund that holds foreign securities will be affected favor-
ably or unfavorably by changes in currency rates and in exchange control regu-
lations, 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 ac-
counting, auditing, and financial reporting standards and practices comparable
to those applicable to domestic companies, there may be less publicly avail-
able information about certain foreign companies than about domestic compa-
nies. Securities of some foreign companies are generally less liquid and more
volatile than securities of comparable domestic companies. There is generally
less government supervision and regulation of stock exchanges, brokers and
listed companies than in the U.S. In addition, with respect to certain foreign
countries, there is the possibility of expropriation or confiscatory taxation,
political or social instability, or diplomatic developments which could affect
investments in those countries.     
       
          
FUTURES CONTRACTS AND OPTIONS     
   
  Although it has no present intention to do so, the Fund is authorized to en-
ter into stock futures contracts, options, and options on futures contracts
for the following reasons: to maintain cash reserves while simulating full in-
vestment, 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 clos-
ing out futures positions, these costs are lower than transaction costs in-
curred in the purchase and sale of portfolio securities.     
       
       
       
          
  RESTRICTIONS ON THE USE OF FUTURES CONTRACTS. The Fund will not enter into
futures contract transactions to the extent that, immediately thereafter, the
sum of its initial margin deposits on open contracts exceeds 5% of the Fund's
total assets. In addition, the Fund will not enter into futures contracts to
the extent that its outstanding obligations to purchase securities under these
contracts would exceed 20% of the Fund's total assets.     
   
  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 insuffi-
cient cash, it may have to sell portfolio securities to meet daily margin re-
quirements 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.     
 
 
B-4
<PAGE>
 
   
  The risk of loss in trading futures contracts in some strategies can be sub-
stantial, 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 sub-
stantial 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 be-
lieve 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 does involve the risk of im-
perfect 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 expe-
rience 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 bro-
ker with whom the Fund has an open position in a futures contract or related
option.     
       
       
       
LENDING OF SECURITIES
   
  Although there is little demand to borrow preferred stock, the Fund is au-
thorized 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 com-
plete certain transactions, such as covering short sales, avoiding failures to
deliver securities or completing arbitrage operations. By lending its portfo-
lio securities, the Fund can increase its income through the receipt of inter-
est on the loan. Since income derived from lending portfolio securities is not
qualifying income for the purpose of the intercorporate dividends-received de-
duction under Federal tax law, the Fund will limit such activity in accordance
with its objective of maximizing dividend income which qualifies for the de-
duction. 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 to-
tal 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 SEC 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 re-
quirement 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 pro-
gram 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 SEC's
exemptive order.     
 
 
                                                                            B-5
<PAGE>
 
                            YIELD AND TOTAL RETURN
   
  The yield of the Vanguard Preferred Stock Fund for the 30-day period ended
October 31, 1998 was  . %.     
   
  The average annual total return of the Fund for the one-, five-, and ten-
year periods ending October 31, 1998 was  . %,  . %, and  . %, respectively.
Total return is computed by finding the average compounded rates of return
over the one-, five-and ten-year periods set forth above that would equate an
initial amount invested at the beginning of the periods to the ending redeem-
able value of the investment.     
                                  
                               SHARE PRICE     
   
  The Fund's share price, or "net asset value" per share, is calculated by di-
viding 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 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 se-
curities 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.     
 
                              PURCHASE OF SHARES
   
  The purchase price of shares of the Fund is the net asset value per share
next determined after the order is received. The net asset value per share is
calculated as of the close of the New York Stock Exchange on each day the Ex-
change is open for business. An order received prior to the close of the Ex-
change will be executed at the price computed on the date of receipt; and an
order received after the close of the Exchange will be executed at the price
computed on the next day the Exchange is open.     
 
 
B-6
<PAGE>
 
   
  The Fund reserves the right in its sole discretion (i) to suspend the offer-
ing of its shares, (ii) to reject purchase orders when in the judgment of man-
agement such rejection is in the best interest of the Fund, and (iii) to re-
duce or waive the minimum investment for, or any other restrictions on,
initial and subsequent investments for certain fiduciary accounts such as em-
ployee benefit plans, or under circumstances where certain economies can be
achieved in sales of the Fund's shares.     
   
  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 condi-
tions. Under this arrangement, the Fund will be deemed to have received a pur-
chase or redemption order when Schwab or, if applicable, Schwab's authorized
designee, accepts the order in accordance with the Fund's instructions. Cus-
tomer orders that are properly transmitted to the Fund by Schwab, or if appli-
cable, 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 re-
ceived 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 New York Stock Exchange is closed or trading on
the Exchange is restricted as determined by the Securities and Exchange Com-
mission (the "Commission"), (ii) during any period when an emergency exists as
defined by the rules of the Commission as a result of which it is not reasona-
bly 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.     
          
  If the Board of Trustees determines that it would be detrimental to the best
interests of the remaining shareholders of a Fund to make payment wholly or
partly in cash, a Fund may pay the redemption proceeds, in whole or in part by
a distribution in kind of readily marketable securities held by the Fund in
conformity with applicable rules of the SEC. Investors may incur brokerage
charges when they sell securities received in payment of redemptions.     
   
  No charge is made by the Fund for redemptions, except for wire withdrawals
in amounts less than $5,000, which are subject to a maximum charge of $5.00.
The amount received by a Fund shareholder upon redemption may be more or less
than the shareholder's cost, depending on the market value of the Fund's port-
folio securities.     
   
SIGNATURE GUARANTEES     
   
  To protect your account, the Fund, and Vanguard from fraud, signature guar-
antees are required for certain redemptions. Signature guarantees enable the
Fund to verify the identity of the person who has authorized a redemption from
your account. Signature guarantees are required in connection with: (1) all
redemptions, regardless of the amount involved, when the proceeds are to be
paid to someone other than the registered owner(s) and/or registered address;
and (2) share transfer requests. These requirements are not applicable to re-
demptions in Vanguard's prototype retirement plans except in connection with:
(1) distributions made when the proceeds are to be paid to someone other than
the plan participant; (2) certain authorizations to effect exchanges by tele-
phone; and (3) when proceeds are to be wired. These requirements may be waived
by the Fund in certain instances.     
 
 
                                                                            B-7
<PAGE>
 
   
  Signature guarantees may be obtained from a bank, broker, or any other guar-
antor institution that Vanguard deems acceptable. Notaries public are not ac-
ceptable guarantors.     
 
  The signature guarantees must appear either: (1) on the written request for
redemption; (2) on a separate instrument for assignment ("stock power") which
should specify the total number of shares to be redeemed; or (3) on all stock
certificates tendered for redemption and, if shares held by the Fund are also
being redeemed, on the letter or stock power.
                       
                    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 hold-
ers 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 Fund's net asset value, 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 outstand-
ing borrowings exceed 5% of net assets.     
   
  COMMODITIES. The Fund may not invest in commodities, except that it may in-
vest in stock futures contracts, stock options, and options on stock futures
contracts. No more than 5% of the Fund's assets may be used as initial margin
deposit for futures contracts, and no more than 20% of the Fund's 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 is-
suer; 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 il-
liquid.     
   
  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 compa-
ny, except through a merger, consolidation or acquisition of assets, or to the
extent permitted by Section 12 of the Investment Company Act of 1940. Invest-
ment 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 by purchasing fixed
income securities that are publicly distributed, lending its portfolio securi-
ties, or through Vanguard's interfund lending program.     
 
B-8
<PAGE>
 
   
  MARGIN. The Fund may not purchase securities on margin or sell securities
short, except as permitted by the Fund's investment policies relating to com-
modities.     
   
  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.     
   
  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 com-
pliance with the Investment Company Act of 1940.     
   
  UNDERWRITING. The Fund may not engage in the business of underwriting secu-
rities issued by other persons. The Fund will not be considered an underwriter
when disposing of its investment securities.     
   
  None of these limitations prevents the Trust from participating in The Van-
guard Group ("Vanguard"). Because the Trust is a member of the Group, the Fund
may own securities issued by Vanguard, make loans to Vanguard, and contribute
to Vanguard's costs or other financial requirements. See "Management of the
Trust" for more information.     
   
  The investment limitations set forth above are considered at the time in-
vestment 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.     
 
                                                                            B-9
<PAGE>
 
                            
                         MANAGEMENT OF THE TRUST     
   
OFFICERS AND TRUSTEES     
   
  The Officers of the Trust manage its day-to-day operations and are responsi-
ble to the Trust's Board of Trustees. The Trustees set broad policies for the
Trust and choose its Officers. The following is a list of the Trustees and Of-
ficers of the Trust and a statement of their present positions and principal
occupations during the past five years. As a group, the Trust's Trustees and
Officers own less than 1% of the outstanding shares of the Trust. Each Trustee
also serves as a Director of the Vanguard Group, Inc., and as a Trustee of
each of the 35 investment companies administered by Vanguard (34 in the case
of Mr. Malkiel and 28 in the case of Mr. MacLaury). The mailing address of the
Trustees and Officers of the Trust is Post Office Box 876, Valley Forge, PA
19482.     
   
JOHN C. BOGLE (DOB: 5/8/1929), Senior Chairman and Trustee*     
   
Senior Chairman and Director of The Vanguard Group, Inc., and Trustee of each
of the investment companies in The Vanguard Group; Director of The Mead Corp.
(Paper Products), General Accident Insurance, and Chris-Craft Industries, Inc.
(Broadcasting & Plastics Manufacturer).     
   
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.     
   
BARBARA BARNES HAUPTFUHRER (DOB: 10/11/1928), Trustee     
   
Director of The Great Atlantic and Pacific Tea Co. (Retail Stores), IKON Of-
fice Solutions, Inc. (Office Products), Raytheon Co. (Defense/Electronics),
Knight-Ridder, Inc. (Publishing), Massachusetts Mutual Life Insurance Co., and
Ladies Professional Golf Association; and Trustee Emerita of Wellesley Col-
lege.     
   
JOANN HEFFERNAN HEISEN (DOB: 1/25/1950), Trustee     
   
Vice President, Chief Information Officer, and member of the Executive Commit-
tee of Johnson and Johnson (Pharmaceuticals/Consumer Products); Director of
Johnson & Johnson*MERCK Consumer Pharmaceuticals Co., Women First HealthCare,
Inc. (Research and Education Institution), Recording for the Blind and
Dyslexic, 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 Re-
search Organization); Director of American Express Bank, Ltd., The St. Paul
Companies, Inc. (Insurance and Financial Services), and National Steel Corpo-
ration.     
   
BURTON G. MALKIEL (DOB: 8/28/1932), Trustee     
   
Chemical Bank Chairman's Professor of Economics, Princeton University; Direc-
tor of Prudential Insurance Co. of America, Banco Bilbao Gestinova, Baker
Fentress & Co. (Investment Management), The Jeffrey Co. (Holding Company), and
Southern New England Telecommunications Company.     
   
ALFRED M. RANKIN, JR. (DOB: 10/8/1941), Trustee     
   
Chairman, President, Chief Executive Officer, and Director of NACCO Industries
(Machinery/Coal/Appliances); Director of The BFGoodrich Co. (Aircraft
Systems/Manufacturing/Chemicals), and The Standard Products Co. (Rubber Prod-
ucts Company).     
   
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 & Gam-
ble Co., NACCO Industries (Machinery/ Coal/Appliances), and Newfield Explora-
tion Co. (Energy); formerly, Director and Senior Partner of McKinsey & Co.,
and President of New York University.     
 
B-10
<PAGE>
 
   
JAMES O. WELCH, JR. (DOB: 5/13/1931), Trustee     
   
Retired Chairman of Nabisco Brands, Inc. (Food Products); retired Vice Chair-
man 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     
   
Chairman and Chief Executive Officer of Rohm & Haas Co. (Chemicals); Director
of Cummins Engine Co. (Diesel Engine Company), and The Mead Corp. (Paper Prod-
ucts); 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 Trust are "interested persons" as defined in the Investment
  Company Act of 1940.     
       
THE VANGUARD GROUP
   
  The Trust is a member of The Vanguard Group of Investment Companies, which
consists of more than 30 investment companies (the "Trusts"). Through their
jointly-owned subsidiary, The Vanguard Group, Inc. ("Vanguard"), the Trust and
the other Trusts 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 Trusts.     
   
  Vanguard employs a supporting staff of management and administrative person-
nel needed to provide the requisite services to the Trusts and also furnishes
the Trusts with necessary office space, furnishings and equipment. Each Trust
pays its share of Vanguard's total expenses which are allocated among the
funds under methods approved by the Board of Trustees of each Trust. In addi-
tion, each Trust 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 un-
der the Investment Company Act of 1940. The Code is designed to prevent unlaw-
ful practices in connection with the purchase or sale of securities by persons
associated with Vanguard. Vanguard's Code of Ethics limits the ability of cer-
tain 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
Trusts. 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 invest a maximum of .40% of its current net assets in Van-
guard, and (2) there are no restrictions on the maximum aggregate cash invest-
ment that the Vanguard Funds may make in Vanguard. At October 31, 1998, the
Fund had contributed capital of $ .  to Vanguard, representing  . % of Van-
guard'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
 
                                                                           B-11
<PAGE>
 
   
custodian relationships; (6) shareholder reporting; and (7) review and evalua-
tion of advisory and other services provided to the Trusts by third parties.
During the fiscal year ended October 31, 1998, the Trust's share of Vanguard's
actual net costs of operation relating to management and administrative serv-
ices (including transfer agency) totaled approximately $ . .     
 
DISTRIBUTION
          
  Vanguard Marketing Corporation, a wholly-owned subsidiary of The Vanguard
Group, Inc., provides all distribution and marketing activities for the Trusts
in the Group. The principal distribution expenses are for advertising, promo-
tional materials, and marketing personnel. Distribution services may also in-
clude organizing and offering to the public, from time to time, one or more
new investment companies which will become members of The Vanguard Group. 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 Trust, 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 remain-
ing 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 na-
ture shall exceed 125% of the average distribution expense rate for The Van-
guard Group, and that no Fund shall incur annual distribution expenses in ex-
cess of .20 of 1% of its average month-end net assets. During the fiscal year
ended October 31, 1998, the Trust paid approximately $ .  of The Vanguard
Group's distribution and marketing expenses, which represented an effective
annual rate of  .  of 1% of the Trust's average net assets.     
 
INVESTMENT ADVISORY SERVICES
   
  Vanguard provides investment advisory services to several Vanguard Trusts
(but not to this Trust). 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 and Trusts utilizing these
services.     
   
TRUSTEE COMPENSATION     
   
  The individuals in the following table serve as Trustees of all Vanguard
Trusts, and each Trust pays a proportionate share of the Trustees' compensa-
tion. The Trusts employ their Officers on a shared basis, as well. However,
Officers are compensated by The Vanguard Group, Inc., not the Trusts.     
   
  INDEPENDENT TRUSTEES. The Trusts compensate their independent Trustees--that
is, the ones who are not also Officers of the Trust--in three ways:     
     
  .  The independent Trustees receive an annual fee for their service to the
     Trusts, 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" TRUSTEES. The Trusts' interested Trustees--Messrs. Bogle and
Brennan--receive no compensation for their service in that capacity. However,
they are paid in their role as Officers of The Vanguard Group, Inc.     
 
B-12
<PAGE>
 
   
  COMPENSATION TABLE. The following table provides compensation details for
each of the Trustees. For the Trust, we list the amounts paid as compensation
and accrued as retirement benefits by the Trust for each Trustee. In addition,
the table shows the total amount of benefits that we expect each Trustee to
receive from all Vanguard Trusts upon retirement, and the total amount of com-
pensation paid to each Trustee by all Vanguard Trusts. All information shown
is for the fiscal year ended October 31, 1998.     
 
                         VANGUARD PREFERRED STOCK FUND
                          
                       TRUSTEES' COMPENSATION TABLE     
 
<TABLE>   
<CAPTION>
                                                                       TOTAL
                                            PENSION OR              COMPENSATION
                                            RETIREMENT   ESTIMATED    FROM ALL
                                             BENEFITS      ANNUAL     VANGUARD
                               AGGREGATE    ACCRUED AS    BENEFITS     TRUSTS
                              COMPENSATION PART OF TRUST    UPON      PAID TO
NAMES OF TRUSTEES              FROM TRUST    EXPENSES    RETIREMENT TRUSTEES(1)
- -----------------             ------------ ------------- ---------- ------------
<S>                           <C>          <C>           <C>        <C>
John C. Bogle................     None         None         None        None
John J. Brennan..............     None         None         None        None
Barbara Barnes Hauptfuhrer...     $  .         $  .         $  .        $  .
JoAnn Heffernan Heisen.......     $  .         $  .         $  .        $  .
Robert E. Cawthorn(2)........     $  .         $  .         $  .        $  .
Bruce K. MacLaury............     $  .         $  .         $  .        $  .
Burton G. Malkiel............     $  .         $  .         $  .        $  .
Alfred M. Rankin, Jr.........     $  .         $  .         $  .        $  .
John C. Sawhill..............     $  .         $  .         $  .        $  .
James O. Welch, Jr...........     $  .         $  .         $  .        $  .
J. Lawrence Wilson...........     $  .         $  .         $  .        $  .
</TABLE>    
- --------
          
(1) The amounts reported in this column reflect the total compensation paid to
    each Trustee for their service as Trustee of 35 Vanguard Trusts (34 in the
    case of Mr. Malkiel; 28 in the case of Mr. MacLaury).     
   
(2) Mr. Cawthorn has retired from the Trust's Board, effective May 31, 1998.
        
                         INVESTMENT ADVISORY SERVICES
   
  The Trust 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 Trust.     
 
  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 per-
centage rates, to the Fund's average month-end net assets for the quarter:
 
<TABLE>
<CAPTION>
   NET ASSETS                                                              RATE
   ----------                                                              -----
   <S>                                                                     <C>
   First $200 million..................................................... .150%
   Next $200 million...................................................... .100%
   Assets in excess of $400 million....................................... .075%
</TABLE>
   
  During the fiscal years ended October 31, 1996, 1997, and 1998, the Fund
paid advisory fees of $394,000, $406,000, and $ .  respectively. Until July
31, 1996, fees were paid under an advisory agreement that provided for a
higher rate of fees.     
 
                                                                           B-13
<PAGE>
 
   
  The Trust'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 In-
vestment Company Act of 1940) of any such party.     
   
  The Board of Trustees may, without the approval of shareholders, provide
for:     
     
    A. The employment of a new investment adviser pursuant to the terms of a
  new advisory agreement, either as a replacement for the existing Adviser or
  as an additional adviser.     
     
    B. A change in the terms of the advisory agreement.     
     
    C. The continued employment of the existing Adviser after an assignment
  of the advisory agreement resulting from a change in control of the Advis-
  er.     
   
  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.     
   
  The Adviser specializes in providing investment management services, with
Group funds under management currently in excess of $ .  billion.     
 
                            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 un-
dertaken to execute each investment transaction at a price and commission
which provides the most favorable total cost or proceeds reasonably obtainable
under the circumstances.     
   
  In placing portfolio transactions, the Adviser will use its best judgment to
choose the broker most capable of providing the brokerage services necessary
to obtain best available price and most favorable execution. The full range
and quality of brokerage services available will be considered in making these
determinations. In those instances where it is reasonably determined that more
than one broker can offer the brokerage services needed to obtain the best
available price and most favorable execution, consideration may be given to
those brokers which supply investment research and statistical information and
provide other services in addition to execution services to the Fund and/or
the Adviser. The Adviser considers such information useful in the performance
of its obligations, but is unable to determine the amount by which such serv-
ices 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 commis-
sion 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 other-
wise 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     
 
B-14
<PAGE>
 
   
are also providers of research information to the Adviser and/or the Fund.
However, the Adviser has informed the Fund that it will not pay higher commis-
sion rates specifically for the purpose of obtaining research services.     
          
  During the fiscal years ended October 31, 1996, 1997, and 1998 the Fund paid
$7,554, $516, and $ .  in brokerage commissions, respectively.     
   
  Some securities considered for investment by the Fund may also be appropri-
ate 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 consid-
ered at or about the same time, transactions in such securities will be allo-
cated among the several funds and clients in a manner deemed equitable by the
Adviser.     
       
                                                                           B-15
<PAGE>
 
                             FINANCIAL STATEMENTS
   
  The Trust's Financial Statements as of and for the year ended October 31,
1998, including the financial highlights for each of the five fiscal years in
the period ended October 31, 1998, appearing in the Vanguard Preferred Stock
Fund 1998 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 Trust's Annual
Report to Shareholders, which may be obtained without charge.     
 
B-16
<PAGE>
 
                             PERFORMANCE MEASURES
   
  Vanguard may use reprinted material discussing The Vanguard Group, Inc. or
any of the member funds of The Vanguard Group of Investment Companies.     
 
  Each of the investment company members of The Vanguard Group, including Van-
guard Preferred Stock Fund, may, from time to time, use one or more of the
following unmanaged indices for comparative performance purposes.
   
  STANDARD AND POOR'S 500 COMPOSITE STOCK PRICE INDEX--contains the stocks of
500 of the largest domestic companies.     
 
  STANDARD & POOR'S MIDCAP 400 INDEX--is composed of 400 medium sized domestic
stocks.
 
  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 secu-
rities, 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 ex-
cept for the 500 stocks in the Standard and Poor's 500 Index.
 
  MORGAN STANLEY CAPITAL INTERNATIONAL EAFE INDEX--is an arithmetic, market
value-weighted average of the performance of over 900 securities listed on the
stock exchanges of countries in Europe, Australia, Asia and the Far East.
 
  GOLDMAN SACHS 100 CONVERTIBLE BOND INDEX--currently includes 71 bonds and 29
preferreds. The original list of names was generated by screening for convert-
ible issues of $100 million or greater in market capitalization. The index is
priced monthly.
 
  SALOMON BROTHERS GNMA INDEX--includes pools of mortgages originated by pri-
vate lenders and guaranteed by the mortgage pools of the Government National
Mortgage Association.
 
  SALOMON BROTHERS HIGH-GRADE CORPORATE BOND INDEX--consists of publicly is-
sued, 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 con-
tains 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 $4 trillion.
 
  LEHMAN BROTHERS MUTUAL FUND SHORT (1-5) GOVERNMENT/CORPORATE INDEX--is a
market weighted index that contains over 1,500 individually priced U.S. Trea-
sury, agency, and corporate investment grade bonds rated BBB--or better with
maturities between 1 and 5 years. The index has a market value of over $1.6
trillion.
 
 
                                                                           B-17
<PAGE>
 
  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 maturi-
ties between 5 and 10 years. The index has a market value of over $700 bil-
lion.
 
  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 10
years. The index has a market value of over $900 billion.
 
  LEHMAN LONG-TERM TREASURY BOND INDEX--is composed of all bonds covered by
the Shearson Lehman Hutton Treasury Bond Index with maturities of 10 years or
greater.
 
  MERRILL LYNCH CORPORATE & GOVERNMENT BOND 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, noncon-
vertible domestic corporate bonds rated Baa by Moody's, with a maturity longer
than 1 year and with more than $25 million outstanding. This index includes
over 1,000 issues.
 
  LEHMAN BROTHERS LONG-TERM CORPORATE BOND INDEX--is a subset of the Lehman
Corporate Bond Index covering all corporate, publicly issued, fixed-rate, non-
convertible U.S. debt issues rated at least Baa, with at least $50 million
principal outstanding and maturity greater than 10 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 in-
clude 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-18
<PAGE>
 
               APPENDIX--DESCRIPTION OF PREFERRED STOCK RATINGS
 
  Excerpts from Moody's Investors Service, Inc. description of its four high-
est 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-19
<PAGE>
 
                                    PART C
 
                         VANGUARD PREFERRED STOCK FUND
 
                               OTHER INFORMATION
   
ITEM 23. EXHIBITS     
       
<TABLE>   
   <C> <S>
   (a) Declaration of Trust*
   (b) By-Laws*
   (c) Not Applicable
   (d) Investment Advisory Contracts*
   (e) Not Applicable
   (f) Reference is made to the section entitled "Management of the Trust" in
       the Registrant's Statement of Additional Information
   (g) Custodian Agreement*
   (h) Amended and Restated Funds' Service Agreement*
   (i) Legal Opinion*
   (j) Consent of Independent Accountants**
   (k) Not Applicable
   (l) Not Applicable
   (m) Not Applicable
   (n) Financial Data Schedule+
   (o) Not Applicable
</TABLE>    
- --------
     
  *Filed previously.     
     
  +Filed herewith.     
     
  **To be Filed by Amendment     
   
ITEM 24. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT     
   
  Registrant is not controlled by or under common control with any person.
    
          
ITEM 25. INDEMNIFICATION     
          
  The Registrant's organizational documents contain provisions indemnifying
Trustees and officers against liability incurred in their official capacity.
Article VII, Section 2 of the Declaration of Trust provides that the Regis-
trant may indemnify and hold harmless each and every Trustee and officer from
and against any and all claims, demands, costs, losses, expenses, and damages
whatsoever arising out of or related to the performance of his or her duties
as a Trustee or officer. However, this provision does not cover any liability
to which a Trustee or officer would otherwise be subject by reason of willful
misfeasance, bad faith, gross negligence, or reckless disregard of the duties
involved in the conduct of his or her office. Article VI of the By-Laws gener-
ally provides that the Registrant shall indemnify its Trustees and officers
from any liability arising out of their past or present service in that capac-
ity. Among other things, this provision excludes any liability arising by rea-
son of willful misfeasance, bad faith, gross negligence, or the reckless dis-
regard of the duties involved in the conduct of the Trustee's or officer's
office with the Registrant.     
          
ITEM 26. BUSINESS AND OTHER CONNECTIONS OF THE INVESTMENT ADVISER     
   
  Wellington Management Company, LLP ("Wellington Management") is an invest-
ment adviser registered under the Investment Advisers Act of 1940, as amended
(the "Advisers Act"). The list required by this Item 26 of officers and part-
ners of Wellington Management, together with any information as to any busi-
ness profession, vocation or employment of a substantial nature engaged in by
such officers and partners during the past two years, is incorporated herein
by reference from Schedules B and D of Form ADV filed by Wellington Management
pursuant to the Advisers Act (SEC File No. 801-159089).     
 
 
                                                                            C-1
<PAGE>
 
   
  See also the information under the caption "Investment Adviser" in the pro-
spectus, constituting Part A of the Fund's Registration Statement, and "In-
vestment Advisory Services" in the Statement of Additional Information consti-
tuting Part B of the Fund's Registration Statement.     
   
ITEM 27. PRINCIPAL UNDERWRITERS     
   
  (a) Not Applicable     
  (b) Not Applicable
   
  (c) Not Applicable     
   
ITEM 28. LOCATION OF ACCOUNTS AND RECORDS     
   
  The books, accounts, and other documents required to be maintained by Sec-
tion 31(a) of the Investment Company Act and the rules promulgated thereunder
will be maintained at the offices of Registrant; Registrant's Transfer Agent,
The Vanguard Group, Inc., 100 Vanguard Boulevard, Malvern, Pennsylvania 19355;
and the Registrant's Custodian, State Street Bank and Trust Company, 225
Franklin Street, Boston, Massachusetts 02105.     
   
ITEM 29. MANAGEMENT SERVICES     
   
  Other than as set forth under the description of The Vanguard Group in Part
B of this Registration Statement, the Registrant is not a party to any manage-
ment-related service contract.     
   
ITEM 30. UNDERTAKINGS     
   
  Not Applicable     
 
C-2
<PAGE>
 
                                  SIGNATURES
   
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933 AND RULE 485(A)
THEREUNDER, AND THE INVESTMENT COMPANY ACT OF 1940, THE REGISTRANT HAS DULY
CAUSED THIS POST-EFFECTIVE AMENDMENT TO THIS REGISTRATION STATEMENT TO BE
SIGNED ON ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED, IN THE
TOWN OF VALLEY FORGE AND THE COMMONWEALTH OF PENNSYLVANIA, ON THIS 30TH DAY OF
NOVEMBER, 1998.     
 
                                          Vanguard Preferred Stock Fund
                                                     
                                                                    
                                          By         Heidi Stam      
                                             ----------------------------------
                                                    JOHN J. BRENNAN*
                                                 CHAIRMAN OF THE BOARD,
                                              PRESIDENT AND CHIEF EXECUTIVE
                                                         OFFICER
 
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS POST-EFFEC-
TIVE AMENDMENT TO THE REGISTRATION STATEMENT HAS BEEN SIGNED BELOW BY THE FOL-
LOWING PERSONS IN THE CAPACITIES AND ON THE DATE INDICATED:

<TABLE>     
<CAPTION> 
 
             SIGNATURES                        TITLE                 DATE
             ----------                        -----                 ----
<S>                                    <C>                    <C> 
           Heidi Stam                  Senior Chairman of     November 30, 1998
- -------------------------------------   the Board and             
           JOHN C. BOGLE*               Trustee          
 
                                                                 
           Heidi Stam                  Chairman of the        November 30, 1998
- -------------------------------------   Board, President,         
          JOHN J. BRENNAN*              and Chief Executive 
                                        Officer             

                                                                     
           Heidi Stam                  Trustee                November 30, 1998
- -------------------------------------                             
     BARBARA B. HAUPTFUHRER 
 
                                       
           Heidi Stam                  Trustee                November 30, 1998
- -------------------------------------                             
    JOANN HEFFERNAN HEISEN* 
 
                                                                
           Heidi Stam                  Trustee                November 30, 1998
- -------------------------------------                             
         BURTON G. MALKIEL*
 
                                                                
           Heidi Stam                  Trustee                November 30, 1998
- -------------------------------------                             
         BRUCE K. MACLAURY*
 
                                                                 
           Heidi Stam                  Trustee                November 30, 1998
- -------------------------------------                             
       ALFRED M. RANKIN, JR.*
 
                                                                 
           Heidi Stam                  Trustee                November 30, 1998
- -------------------------------------                             
          JOHN C. SAWHILL*
</TABLE>      
<PAGE>

<TABLE>     
<CAPTION> 
 
              SIGNATURE                         TITLE                DATE
              ---------                         -----                ----
<S>                                     <C>                   <C> 
           Heidi Stam                   Trustee               November 30, 1998
- -------------------------------------                             
        JAMES O. WELCH, JR.*
 
                                                                 
           Heidi Stam                   Trustee               November 30, 1998
- -------------------------------------                            
         J. LAWRENCE WILSON*
 
                                                                
           Heidi Stam                   Treasurer and         November 30, 1998
- -------------------------------------    Principal Financial     
       THOMAS J. HIGGINS*                and Accounting      
                                         Officer             
</TABLE>      
                 
- --------
   
* By Power of Attorney. See File Number  . .  . . Incorporated by Reference.
    
<PAGE>
 
                               INDEX TO EXHIBITS
 
<TABLE>   
<S>                                                                     <C>
Financial Data Schedule................................................ EX-99.BN
</TABLE>    

<PAGE>
 
[ARTICLE] 6
[RESTATED] 
[CIK] 0000081391
[NAME] VANGUARD PREFERRED STOCK FUND
[MULTIPLIER] 1,000
[CURRENCY] US
<TABLE>
<S>                             <C>
[PERIOD-TYPE]                   12-MOS
[FISCAL-YEAR-END]                          OCT-31-1998
[PERIOD-START]                             NOV-01-1997
[PERIOD-END]                               APR-30-1998
[EXCHANGE-RATE]                                      1
[INVESTMENTS-AT-COST]                          330,134
[INVESTMENTS-AT-VALUE]                         350,991
[RECEIVABLES]                                    1,686
[ASSETS-OTHER]                                      20
[OTHER-ITEMS-ASSETS]                                 0
[TOTAL-ASSETS]                                 352,697
[PAYABLE-FOR-SECURITIES]                           500
[SENIOR-LONG-TERM-DEBT]                              0
[OTHER-ITEMS-LIABILITIES]                          628
[TOTAL-LIABILITIES]                              1,128
[SENIOR-EQUITY]                                      0
[PAID-IN-CAPITAL-COMMON]                       326,956
[SHARES-COMMON-STOCK]                           34,015
[SHARES-COMMON-PRIOR]                           31,473
[ACCUMULATED-NII-CURRENT]                          240
[OVERDISTRIBUTION-NII]                               0
[ACCUMULATED-NET-GAINS]                          3,516
[OVERDISTRIBUTION-GAINS]                             0
[ACCUM-APPREC-OR-DEPREC]                        20,857
[NET-ASSETS]                                   351,569
[DIVIDEND-INCOME]                                9,830
[INTEREST-INCOME]                                  421
[OTHER-INCOME]                                       0
[EXPENSES-NET]                                     597
[NET-INVESTMENT-INCOME]                          9,654
[REALIZED-GAINS-CURRENT]                         5,346
[APPREC-INCREASE-CURRENT]                          992
[NET-CHANGE-FROM-OPS]                           15,992
[EQUALIZATION]                                       0
[DISTRIBUTIONS-OF-INCOME]                       10,807
[DISTRIBUTIONS-OF-GAINS]                             0
[DISTRIBUTIONS-OTHER]                                0
[NUMBER-OF-SHARES-SOLD]                          5,520
[NUMBER-OF-SHARES-REDEEMED]                      3,764
[SHARES-REINVESTED]                                786
[NET-CHANGE-IN-ASSETS]                          31,450
[ACCUMULATED-NII-PRIOR]                          1,393
[ACCUMULATED-GAINS-PRIOR]                      (1,830)
[OVERDISTRIB-NII-PRIOR]                              0
[OVERDIST-NET-GAINS-PRIOR]                           0
[GROSS-ADVISORY-FEES]                              221
[INTEREST-EXPENSE]                                   0
[GROSS-EXPENSE]                                    597
[AVERAGE-NET-ASSETS]                           338,268
[PER-SHARE-NAV-BEGIN]                            10.17
[PER-SHARE-NII]                                   0.30
[PER-SHARE-GAIN-APPREC]                           0.20
[PER-SHARE-DIVIDEND]                              0.33
[PER-SHARE-DISTRIBUTIONS]                            0
[RETURNS-OF-CAPITAL]                                 0
[PER-SHARE-NAV-END]                              10.34
[EXPENSE-RATIO]                                   0.36
[AVG-DEBT-OUTSTANDING]                               0
[AVG-DEBT-PER-SHARE]                                 0
</TABLE>


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