VAN KAMPEN ENTERPRISE FUND
485APOS, 2000-07-27
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<PAGE>   1


     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 27, 2000


                                                       REGISTRATION NOS. 2-10559
                                                                         811-630
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                   FORM N-1A

<TABLE>
<S>                                                          <C>
REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933         [X]
      POST-EFFECTIVE AMENDMENT NO. 40                           [X]
REGISTRATION STATEMENT UNDER THE
INVESTMENT COMPANY ACT OF 1940                                  [X]
      AMENDMENT NO. 34                                          [X]
</TABLE>


                           VAN KAMPEN ENTERPRISE FUND

        (EXACT NAME OF REGISTRANT AS SPECIFIED IN DECLARATION OF TRUST)
      1 PARKVIEW PLAZA, PO BOX 5555, OAKBROOK TERRACE, ILLINOIS 60181-5555
               (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)(ZIP CODE)
                                 (630) 684-6000
               REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE

                              A. THOMAS SMITH III
            EXECUTIVE VICE PRESIDENT, GENERAL COUNSEL AND SECRETARY
                          VAN KAMPEN INVESTMENTS INC.
                                1 PARKVIEW PLAZA
                                  PO BOX 5555
                     OAKBROOK TERRACE, ILLINOIS 60181-5555
                    (NAME AND ADDRESS OF AGENT FOR SERVICE)

                                   Copies to:
                             WAYNE W. WHALEN, ESQ.
                              THOMAS A. HALE, ESQ.
                SKADDEN, ARPS, SLATE, MEAGHER & FLOM (ILLINOIS)
                             333 WEST WACKER DRIVE
                            CHICAGO, ILLINOIS 60606
                                 (312) 407-0700
                             ---------------------

APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING: As soon as practicable following
effectiveness of this Registration Statement.
It is proposed that this filing will become effective:

     [ ]  immediately upon filing pursuant to paragraph (b)

     [ ]  on (date) pursuant to paragraph (b)

     [X]  60 days after filing pursuant to paragraph (a)(1)

     [ ]  on (date) pursuant to paragraph (a)(1)
     [ ]  75 days after filing pursuant to paragraph (a)(2)
     [ ]  on (date) pursuant to paragraph (a)(2) of Rule 485

If appropriate check the following box:
     [ ]  this post-effective amendment designates a new effective date for a
          previously filed post-effective amendment.

TITLE OF SECURITIES BEING REGISTERED: SHARES OF BENEFICIAL INTEREST, PAR VALUE
$0.01 PER SHARE.
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
<PAGE>   2


     *The information in this prospectus is not complete and may be changed. We
     may not sell these securities until the registration statement filed with
     the Securities and Exchange Commission is effective. This prospectus is not
     an offer to sell securities and is not soliciting an offer to buy these
     securities in any state where the offer or sale is not permitted.


                            [VAN KAMPEN FUNDS LOGO]


                   SUBJECT TO COMPLETION -- DATED JULY 27, 2000


                                  VAN  KAMPEN
                                ENTERPRISE  FUND

Van Kampen Enterprise Fund is a mutual fund with the investment objective to
seek capital appreciation by investing in a portfolio of securities consisting
principally of common stocks.
Shares of the Fund have not been approved or disapproved by the Securities and
Exchange Commission (SEC) or any state regulator, and neither the SEC nor any
state regulator has passed upon the accuracy or adequacy of this prospectus. Any
representation to the contrary is a criminal offense.


                 This prospectus is dated  SEPTEMBER   , 2000.



                                 CLASS D SHARES


                                   PROSPECTUS

<PAGE>   3

                               TABLE OF CONTENTS


<TABLE>
<S>                                                 <C>
Risk/Return Summary................................   3
Fees and Expenses of the Fund......................   5
Investment Objective, Policies and Risks...........   5
Investment Advisory Services.......................   9
Purchase of Shares.................................  10
Redemption of Shares...............................  11
Distributions from the Fund........................  13
Shareholder Services...............................  13
Federal Income Taxation............................  14
</TABLE>


No dealer, salesperson or any other person has been authorized to give any
information or to make any representations, other than those contained in this
prospectus, in connection with the offer contained in this prospectus and, if
given or made, such other information or representations must not be relied upon
as having been authorized by the Fund, the Fund's investment adviser or the
Fund's distributor. This prospectus does not constitute an offer by the Fund or
by the Fund's distributor to sell or a solicitation of an offer to buy any of
the securities offered hereby in any jurisdiction to any person to whom it is
unlawful for the Fund to make such an offer in such jurisdiction.
<PAGE>   4

                              RISK/RETURN SUMMARY

                              INVESTMENT OBJECTIVE

The Fund is a mutual fund with the investment objective to seek capital
appreciation by investing in a portfolio of securities consisting principally of
common stocks.

                             INVESTMENT STRATEGIES

Under normal market conditions, the Fund's investment adviser seeks to achieve
the Fund's investment objective by investing principally in common stocks which
are believed by the Fund's investment adviser to have above-average potential
for capital appreciation. The Fund invests primarily in common stocks of
"growth" companies focusing on securities believed to offer a combination of
strong business fundamentals at an attractive valuation. Portfolio securities
are typically sold when the Fund's investment adviser's assessments of the
capital appreciation potential of such securities materially change. The Fund
may invest up to 15% of its total assets in securities of foreign issuers. The
Fund may purchase and sell certain derivatives, such as options, futures and
options on futures, for various portfolio management purposes.

                                INVESTMENT RISKS

An investment in the Fund is subject to investment risks, and you could lose
money on your investment in the Fund. There can be no assurance that the Fund
will achieve its investment objective.

MARKET RISK. Market risk is the possibility that the market values of securities
owned by the Fund will decline. Market risk may affect a single issuer,
industry, sector of the economy or the market as a whole. Investments in common
stocks generally are affected by changes in the stock markets, which fluctuate
substantially over time, sometimes suddenly and sharply. The Fund emphasizes a
"growth" style of investing. The market values of "growth" common stocks may be
more volatile than other types of investments. The returns on "growth"
securities may or may not move in tandem with the returns on other styles of
investing or the overall stock markets. During an overall stock market decline,
stock prices of small- or medium-sized companies (in which the Fund may invest)
may be more volatile and may fall more than stock prices of larger companies.

FOREIGN RISKS. Because the Fund may own securities of foreign issuers, it may be
subject to risks not usually associated with owning securities of U.S. issuers.
These risks can include fluctuations in foreign currencies, foreign currency
exchange controls, political and economic instability, differences in financial
reporting, differences in securities regulation and trading, and foreign
taxation issues.

RISKS OF USING DERIVATIVE INSTRUMENTS. In general terms, a derivative instrument
is one whose value depends on (or is derived from) the value of an underlying
asset, interest rate or index. Options, futures and options on futures are
examples of derivatives. Derivative instruments involve risks different from
direct investment in underlying securities. These risks include imperfect
correlation between the value of the instruments and the underlying assets;
risks of default by the other party to certain transactions; risks that the
transactions may result in losses that partially or completely offset gains in
portfolio positions; risks that the transactions may not be liquid; and manager
risk.

MANAGER RISK. As with any managed fund, the Fund's investment adviser may not be
successful in selecting the best-performing securities or investment techniques,
and the Fund's performance may lag behind that of similar funds.

                                INVESTOR PROFILE

In light of the Fund's investment objective and strategies, the Fund may be
appropriate for investors who:

- Seek capital appreciation over the long term

- Do not seek current income from their investment

- Can withstand substantial volatility in the value of their shares of the Fund

- Wish to add to their personal investment portfolio a fund that emphasizes a
  "growth" style of investing in common stocks

An investment in the Fund is not a deposit of any bank or other insured
depository institution. An investment in the Fund is not insured or guaranteed
by the Federal Deposit Insurance Corporation or any other government agency.

An investment in the Fund may not be appropriate for all investors. The Fund is
not intended to be a complete investment program, and investors should consider
their long-term investment goals and financial needs when making an investment
decision

                                        3
<PAGE>   5

about the Fund. An investment in the Fund is intended to be a long-term
investment, and the Fund should not be used as a trading vehicle.

                               ANNUAL PERFORMANCE


One way to measure the risks of investing in the Fund is to look at how its
performance has varied from year-to-year. The following chart shows the annual
returns of the Fund* over the ten calendar years prior to the date of this
prospectus. Remember that the past performance of the Fund is not indicative of
its future performance.


<TABLE>
<CAPTION>
                                                                             ANNUAL RETURN
                                                                             -------------
<S>                                                           <C>
1990                                                                             -2.87
1991                                                                             39.23
1992                                                                              8.39
1993                                                                             10.95
1994                                                                             -0.19
1995                                                                             33.92
1996                                                                             23.49
1997                                                                             28.55
1998                                                                             23.56
1999                                                                             26.56
</TABLE>


   * The Fund commenced offering Class D Shares on       , 2000. The returns
     shown in the Annual Performance chart above (and in the Comparative
     Performance chart below) are for the Class A Shares of the Fund (which are
     offered in a separate prospectus). The annual return variability of the
     Fund's Class D Shares would be substantially similar to that shown for the
     Class A Shares because all of the Fund's shares are invested in the same
     portfolio of securities; however, the actual annual returns of the Class D
     Shares would be higher than the annual returns shown for the Fund's Class A
     Shares because of differences in the expenses borne by each class of
     shares.


The Fund's return for Class A Shares for the six month period ended June 30,
2000 was      %.


During the ten-year period shown in the bar chart, the highest quarterly return
was 24.62% (for the quarter ended December 31, 1998) and the lowest quarterly
return was -15.78% (for the quarter ended September 30, 1990).

                            COMPARATIVE PERFORMANCE


As a basis for evaluating the Fund's performance and risks, the table below
shows how the Fund's performance compares with two broad-based market indices
that the Fund's investment adviser believes are appropriate benchmarks for the
Fund: the Standard & Poor's 500-Stock Index** and the Russell 1000 Growth
Index***; and with the Lipper Growth Fund Index****, an index of funds with
similar investment objectives. The Fund's performance figures are for the Fund's
Class A Shares and include the maximum sales charges paid by investors on such
Class A Shares*. The indices' performance figures do not include any commissions
or sales charges that would be paid by investors purchasing the securities
represented by the indices. An investment can not be made directly in the
indices. Average annual total returns are shown for the periods ended December
31, 1999 (the most recently completed calendar year prior to the date of this
prospectus). Remember that the past performance of the Fund is not indicative of
its future performance.



<TABLE>
<CAPTION>
     Average Annual
      Total Returns
         for the
      Periods Ended     Past     Past      Past 10
    December 31, 1999  1 Year   5 Years     Years
-------------------------------------------------------
<S> <C>                <C>      <C>       <C>       <C>
    Van Kampen
    Enterprise Fund--
    Class A Shares*    19.25%   25.64%     17.66%
    Standard & Poor's
    500-Stock Index**  21.04%   28.56%     18.21%
    Russell 1000
    Growth Index***    33.16%   32.41%     20.32%
    Lipper Growth
    Fund Index****     27.96%   26.27%     17.25%
 .......................................................
</TABLE>



   * The Fund commenced offering Class D Shares on       , 2000. The returns
     shown in the Comparative Performance chart are for the Class A Shares of
     the Fund (which are offered in a separate prospectus). The annual return
     variability of the Fund's Class D Shares would be substantially similar to
     that shown for the Class A Shares because all of the Fund's shares are
     invested in the same portfolio of securities; however the actual returns of
     the Class D Shares would be higher than the annual returns shown for the
     Fund's Class A Shares because of the differences in the expenses borne by
     each class of shares.


  ** The Standard and Poor's 500-Stock Index consists of 500 widely-held common
     stock of companies with market capitalization of $1 billion or more that
     are a representative sample of approximately 100 industries, chosen mainly
     for market size, liquidity and industry group representation (assumes
     dividends are reinvested).


 *** The Russell 1000 Growth Index measures the performance of those Russell
     1000 Index companies with higher price-to-book ratios and higher forecasted
     growth values. The Russell 1000 Index is an index of the 1,000 largest U.S.
     companies based on market capitalization.


                                        4
<PAGE>   6


**** Since Lipper Analytical Services has reclassified how it categorizes many
     of its indices, the Fund's investment adviser believes the new system is
     less applicable for this Fund. Based on the Fund's asset composition, the
     Fund's investment adviser believes adding the Russell 1000 Growth Index
     provides a more appropriate benchmark for the Fund, and the Lipper Growth
     Fund Index will not be shown in future prospectuses of the Fund.




                               FEES AND EXPENSES
                                  OF THE FUND

This table describes the fees and expenses that you may pay if you buy and hold
shares of the Fund.


<TABLE>
<CAPTION>
                                    Class D
                                    Shares
-----------------------------------------------

SHAREHOLDER FEES
(fees paid directly from your investment)
-----------------------------------------------
<S>                                 <C>     <C>
Maximum sales charge (load)
imposed on purchases (as a
percentage of offering price)       None
 ...............................................
Maximum deferred sales charge
(load)
(as a percentage of the lesser of
original purchase price or
redemption proceeds)                None
 ...............................................
Maximum sales charge (load)
imposed on reinvested dividends
                                    None
 ...............................................
Redemption fees                     None
 ...............................................
Exchange fee                        None
 ...............................................
</TABLE>



<TABLE>
<CAPTION>

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

ANNUAL FUND OPERATING EXPENSES
(expenses that are deducted from Fund assets)
-----------------------------------------------
<S>                                 <C>     <C>
Management fees
 ...............................................
Other expenses
 ...............................................
Total annual fund operating
expenses
 ...............................................
</TABLE>



Example:


The following example is intended to help you compare the cost of investing in
the Fund with the costs of investing in other mutual funds.


The example assumes that you invest $10,000 in the Fund for the time periods
indicated and then redeem all of your shares at the end of those periods. The
example also assumes that your investment has a 5% return each year and that the
Fund's operating expenses remain the same each year. Although your actual costs
may be higher or lower, based on these assumptions your costs would be:



<TABLE>
<CAPTION>
                           One       Three       Five        Ten
                           Year      Years      Years       Years
----------------------------------------------------------------------
<S>                        <C>       <C>        <C>         <C>    <C>
Class D Shares
 ......................................................................
</TABLE>


                             INVESTMENT OBJECTIVE,
                               POLICIES AND RISKS

The Fund's investment objective is to seek capital appreciation by investing in
a portfolio of securities consisting principally of common stocks. Any income
received from the investment of portfolio securities is incidental to the Fund's
investment objective. The Fund's investment objective is a fundamental policy
and may not be changed without shareholder approval of a majority of the Fund's
outstanding voting securities, as defined in the Investment Company Act of 1940,
as amended (the "1940 Act"). There are risks inherent in all investments in
securities; accordingly there can be no assurance that the Fund will achieve its
investment objective.

Under normal market conditions, the Fund's investment adviser seeks to achieve
the Fund's investment objective by investing principally in common stocks which
it believes have above-average potential for capital appreciation. The Fund's
primary approach is to seek what the Fund's investment adviser believes to be
unusually attractive growth investments on an individual company basis. The Fund
may invest in securities that have above average volatility of price movement.
Because prices of common stocks and other securities fluctuate, the value of an
investment in the Fund will vary. In an effort to reduce the portfolio's
exposure to any individual security price decline, the Fund spreads its
investments over many different companies in a variety of industries.

                                        5
<PAGE>   7

In selecting securities for investment, the Fund generally focuses on common
stocks of "growth" companies, including companies with new products, services or
processes. The investment adviser seeks such securities which it believes offer
a combination of strong business fundamentals at an attractive valuation. Growth
companies generally include those companies with established records of growth
in sales or earnings that the Fund's investment adviser believes are in or are
entering into a growth cycle in their respective businesses, with the
expectation that the stock of such companies will increase in value. Stocks of
different types, such as "growth" stocks or "value" stocks, tend to shift in and
out of favor depending on market and economic conditions. Thus, the value of the
Fund's investments in "growth" stocks will vary and at times may be lower or
higher than that of other types of funds. The market values of "growth" common
stocks may be more volatile than other types of investments. The Fund may invest
in companies generating or applying new technologies, new or improved
distribution techniques or new services, which companies may benefit from
changing consumer demands or lifestyles. The Fund may also invest in companies
that have projected earnings in excess of the average for their sector or
industry. In each case, the Fund's investment adviser believes companies have
prospects that are favorable for above-average capital appreciation. The Fund
may also focus its investments on stocks of companies in cyclical industries
during periods when their securities appear attractive for capital appreciation.

The companies in which the Fund invests may be in any market capitalization
range, provided the Fund's investment adviser believes the investment is
consistent with the Fund's objective. The securities of small- or medium-sized
companies may be subject to more abrupt or erratic market movements than
securities of larger companies or the market averages in general. In addition,
such companies typically are subject to a greater degree of change in earnings
and business prospects than are larger companies. Thus, to the extent the Fund
invests in small- and medium-sized companies, the Fund may be subject to greater
risk than that assumed through investment in the equity securities of
larger-capitalization companies.

The Fund may dispose of a security whenever, in the opinion of the Fund's
investment adviser, factors indicate it is desirable to do so. Such factors
include change in economic or market factors in general or with respect to a
particular industry, a change in the market trend or other factors affecting an
individual security, changes in the relative market performance or appreciation
possibilities offered by individual securities and other circumstances bearing
on the desirability of a given investment.

The Fund invests principally in common stocks. Common stocks are shares of a
corporation or other entity that entitle the holder to a pro rata share of the
profits of the corporation, if any, without preference over any other class of
securities, including such entity's debt securities, preferred stock and other
senior equity securities. Common stock usually carries with it the right to vote
and frequently an exclusive right to do so.

While the Fund invests principally in common stocks, the Fund may invest in
preferred stocks and warrants. Preferred stock generally has a preference as to
dividends and liquidation over an issuer's common stock but ranks junior to debt
securities in an issuer's capital structure. Unlike interest payments on debt
securities, preferred stock dividends are payable only if declared by the
issuer's board of directors. Preferred stock also may be subject to optional or
mandatory redemption provisions. Generally, warrants are securities that may be
exchanged for a prescribed amount of common stock or other equity security of
the issuer within a particular period of time at a specified price or in
accordance with a specified formula.

                             RISKS OF INVESTING IN

                         SECURITIES OF FOREIGN ISSUERS

The Fund may invest up to 15% of its total assets in securities of foreign
issuers. Securities of foreign issuers may be denominated in U.S. dollars or in
currencies other than U.S. dollars. Investments in foreign securities present
certain risks not ordinarily associated with investments in securities of U.S.
issuers. These risks include fluctuations in foreign currency exchange rates,
political, economic or legal developments (including war or other instability,
expropriation of assets, nationalization and confiscatory taxation), the
imposition of foreign exchange limitations (including currency blockage),
withholding taxes on dividend or interest payments or capital transactions or
other restrictions, higher transaction costs (including higher brokerage,
custodial and settlement costs and currency conversion costs) and possible
difficulty in enforcing contractual obligations or taking judicial action. Also,
foreign securities may not be as liquid and may be more volatile than comparable
domestic securities.

                                        6
<PAGE>   8

In addition, there is often less publicly available information about many
foreign issuers, and issuers of foreign securities are subject to different,
often less comprehensive auditing, accounting and financial reporting disclosure
requirements than domestic issuers. There is generally less government
regulation of stock exchanges, brokers and listed companies abroad than in the
U.S., and, with respect to certain foreign countries, there is a possibility of
expropriation or confiscatory taxation, or diplomatic developments which could
affect investment in those countries. Because there is usually less supervision
and governmental regulation of foreign exchanges, brokers and dealers abroad
than there is in the U.S., the Fund may experience settlement difficulties or
delays not usually encountered in the U.S.

Delays in making trades in foreign securities relating to volume constraints,
limitations or restrictions, clearance or settlement procedures, or otherwise
could impact returns and result in temporary periods when assets of the Fund are
not fully invested or attractive investment opportunities are foregone.

The Fund may invest in securities of issuers in developing or emerging market
countries. Investments in securities of issuers in developing or emerging market
countries are subject to greater risks than investments in securities of
developed countries since emerging market countries tend to have economic
structures that are less diverse and mature and political systems that are less
stable than developed countries.

In addition to the increased risks of investing in foreign securities, there are
often increased transaction costs associated with investing in foreign
securities including the costs incurred in connection with converting
currencies, higher foreign brokerage or dealer costs, and higher settlement
costs or custodial costs.

                        USING OPTIONS, FUTURES CONTRACTS

                              AND RELATED OPTIONS

The Fund may, but is not required to, use various investment strategic
transactions including options, futures contracts and options on futures
contracts, in several different ways depending upon the status of the Fund's
portfolio and the Fund's investment adviser's expectations concerning the
securities markets. Although the Fund's investment adviser seeks to use the
practices to further the Fund's investment objectives, no assurance can be given
that the use of these practices will achieve this result.

In times of stable or rising stock prices, the Fund generally seeks to be fully
invested in equity securities. Even when the Fund is fully invested, however,
prudent management requires that at least a small portion of assets be available
as cash to honor redemption requests and for other short-term needs. The Fund
may also have cash on hand that has not yet been invested. The portion of the
Fund's assets that is invested in cash or cash equivalents does not fluctuate
with stock market prices, so that, in times of rising market prices, the Fund
may underperform the market in proportion to the amount of cash or cash
equivalents in its portfolio. By purchasing stock index futures contracts,
however, the Fund can compensate for the cash portion of its assets and may
obtain performance equivalent to investing 100% of its assets in equity
securities.

If the Fund's investment adviser forecasts a market decline, the Fund may seek
to reduce its exposure to the securities markets by increasing its cash
position. By selling stock index futures contracts instead of portfolio
securities, a similar result can be achieved to the extent that the performance
of the futures contracts correlates to the performance of the Fund's portfolio
securities. Sales of futures contracts frequently may be accomplished more
rapidly and at less cost than the actual sale of securities. Once the desired
hedged position has been effected, the Fund could then liquidate securities in a
more deliberate manner, reducing its futures position simultaneously to maintain
the desired balance, or it could maintain the hedged position.

The Fund can engage in options transactions on securities, indices or on futures
to attempt to manage the portfolio's risk in advancing or declining markets. For
example, the value of a put option generally increases as the value of the
underlying security declines below a specified level. Value is protected against
a market decline to the degree the performance of the put correlates with the
performance of the Fund's investment portfolio. If the market remains stable or
advances, the Fund can refrain from exercising the put and its portfolio will
participate in the advance, having incurred only the premium cost for the put.

Generally, the Fund expects that options will be purchased or sold on securities
exchanges. However, the Fund is authorized to purchase and sell listed and
over-the-counter options ("OTC Options"). OTC Options are subject to certain
additional risks including default by the other party to the transaction and the
liquidity of the transactions.

                                        7
<PAGE>   9

In certain cases, the options and futures markets provide investment or risk
management opportunities that are not available from direct investments in
securities. In addition, some strategies can be performed with greater ease and
at lower cost by utilizing the options and futures markets rather than
purchasing or selling portfolio securities. However, such transactions involve
risks different from the direct investment in underlying securities. For
example, there may be imperfect correlation between the value of the instruments
and the underlying assets. In addition, the use of such instruments includes the
risks of default by the other party to certain transactions. The Fund may incur
losses that partially or completely offset gains in portfolio positions. These
transactions may not be liquid and involve manager risk. In addition, such
transactions may involve commissions and other costs, which may increase the
Fund's expenses and reduce its return.

A more complete discussion of options, futures contracts and related options and
their risks is contained in the Fund's Statement of Additional Information which
may be obtained by investors free of charge as described on the back cover of
this prospectus.

                       OTHER INVESTMENTS AND RISK FACTORS

For cash management purposes, the Fund may engage in repurchase agreements with
broker-dealers, banks and other financial institutions in order to earn a return
on temporarily available cash. Such transactions are subject to the risk of
default by the other party. It is currently the policy of the Fund not to invest
more than 25% of its total assets at the time of purchase in securities subject
to repurchase agreements.

The Fund may invest up to 10% of the Fund's net assets in illiquid securities
and certain restricted securities. Such securities may be difficult or
impossible to sell at the time and the price that the Fund would like. Thus, the
Fund may have to sell such securities at a lower price, sell other securities
instead to obtain cash or forego other investment opportunities.

The Fund generally holds a portion of its assets in high-quality short-term debt
securities and in "investment grade" corporate debt securities in order to
provide for liquidity (collectively "temporary investments"). High-quality
short-term debt securities include securities issued or guaranteed by the U.S.
government, its agencies or instrumentalities, prime commercial paper,
certificates of deposit, bankers' acceptances and other obligations of domestic
banks having total assets of at least $500 million, and repurchase agreements.
Investment grade bonds include bonds rated Baa or better by Moody's Investors
Service, Inc. ("Moody's") or BBB or better by Standard & Poor's ("S&P"). The
market prices of such bonds can be expected to vary inversely with changes in
prevailing interest rates. Securities rated Baa by Moody's or BBB by S&P are
considered by such rating agencies to be medium-grade obligations which possess
speculative characteristics so that changes in economic conditions or other
circumstances are more likely to lead to a weakened capacity to make principal
and interest payments than in the case of higher rated securities.

Further information about these types of investments and other investment
practices that may be used by the Fund is contained in the Fund's Statement of
Additional Information.


The Fund may sell securities without regard to the length of time they have been
held in order to take advantage of new investment opportunities, or when the
Fund's investment adviser believes the potential for capital appreciation has
lessened, or for other reasons. The portfolio turnover rate may vary from year
to year. A high portfolio turnover rate (100% or more) increases a fund's
transactions costs (including brokerage commissions or dealer costs) and high
portfolio turnover rate may result in the realization of more short-term capital
gains than if a fund had lower portfolio turnover. Increases in a fund's
transaction costs would adversely impact that fund's performance. The turnover
rate will not be a limiting factor, however, if the Fund's investment adviser
considers portfolio changes appropriate.


TEMPORARY DEFENSIVE STRATEGY. When market conditions dictate a more "defensive"
investment strategy the Fund may hold cash or invest a portion or all of its
assets in temporary investments. Under normal market conditions, the potential
for capital appreciation on these securities will tend to be lower than the
potential for capital appreciation on other securities that may be owned by the
Fund. In taking such a defensive position, the Fund would not be pursuing and
may not achieve its investment objective.

                                        8
<PAGE>   10

                          INVESTMENT ADVISORY SERVICES


THE ADVISER. Van Kampen Asset Management Inc. is the Fund's investment adviser
(the "Adviser" or "Asset Management"). The Adviser is a wholly owned subsidiary
of Van Kampen Investments Inc. ("Van Kampen Investments"). Van Kampen
Investments is a diversified asset management company with more than three
million retail investor accounts, extensive capabilities for managing
institutional portfolios, and more than $100 billion under management or
supervision as of June 30, 2000. Van Kampen Investments' more than 50 open-end
and 39 closed-end funds and more than 2,700 unit investment trusts are
professionally distributed by leading authorized dealers nationwide. Van Kampen
Funds Inc., the distributor of the Fund (the "Distributor") and the sponsor of
the funds mentioned above, is also a wholly owned subsidiary of Van Kampen
Investments. Van Kampen Investments is an indirect wholly owned subsidiary of
Morgan Stanley Dean Witter & Co. The Adviser's principal office is located at 1
Parkview Plaza, Oakbrook Terrace, Illinois 60181-5555.


ADVISORY AGREEMENT. The Fund retains the Adviser to manage the investment of its
assets and to place orders for the purchase and sale of its portfolio
securities. Under an investment advisory agreement between the Adviser and the
Fund (the "Advisory Agreement"), the Fund pays the Adviser a monthly fee
computed based upon an annual rate applied to average daily net assets of the
Fund as follows:

<TABLE>
<CAPTION>
    Average Daily Net Assets         % Per Annum
------------------------------------------------------
<S> <C>                             <C>            <C>
    First $1 billion                 0.50 of 1.00%
 ......................................................
    Next $1 billion                  0.45 of 1.00%
 ......................................................
    Next $1 billion                  0.40 of 1.00%
 ......................................................
    Over $3 billion                  0.35 of 1.00%
 ......................................................
</TABLE>

Applying this fee schedule, the Fund paid the Adviser an advisory fee at the
effective rate of 0.44% of the Fund's average daily net assets for the Fund's
fiscal year ended December 31, 1999. The Fund's average daily net assets are
determined by taking the average of all of the determinations of the net assets
during a given calendar month. Such fee is payable for each calendar month as
soon as practicable after the end of that month.

Under the Advisory Agreement, the Adviser furnishes offices, necessary
facilities and equipment and provides administrative services to the Fund. The
Fund also pays all charges and expenses of its day-to-day operations, including
service fees, distribution fees, custodian fees, legal and independent
accountant fees, the costs of reports and proxies to shareholders, compensation
of trustees of the Trust (other than those who are affiliated persons of the
Adviser, Distributor or Van Kampen Investments) and all other ordinary business
expenses not specifically assumed by the Adviser.

From time to time, the Adviser or the Distributor may voluntarily undertake to
reduce the Fund's expenses by reducing the fees payable to them or by reducing
other expenses of the Fund in accordance with such limitations as the Adviser or
Distributor may establish.

The Adviser may utilize, at its own expense, credit analysis, research and
trading support services provided by its affiliate, Van Kampen Investment
Advisory Corp. ("Advisory Corp.").

PERSONAL INVESTMENT POLICIES. The Fund, the Adviser and the Distributor have
adopted Codes of Ethics designed to recognize the fiduciary relationships among
the Fund, the Adviser, the Distributor and their respective employees. The Codes
of Ethics permit directors, trustees, officers and employees to buy and sell
securities for their personal accounts subject to certain restrictions. Persons
with access to certain sensitive information are subject to pre-clearance and
other procedures designed to prevent conflicts of interest.

PORTFOLIO MANAGEMENT. The Fund's management team is headed by Jeff D. New,
Senior Portfolio Manager. Mr. New has been affiliated with the Fund since 1991,
has assisted in co-managing the Fund's investment portfolio since July 1994 and
has been the Senior Portfolio Manager of the Fund's investment portfolio since
December 1994. Mr. New has been Senior Vice President and Senior Portfolio
Manager of the Adviser since December 1997. Prior to December 1997, Mr. New was
Vice President and Portfolio Manager of the Adviser. Prior to December 1994, he
was Associate Portfolio Manager of the Adviser. He joined the Adviser in 1990.


Senior Portfolio Managers Michael Davis and Mary Jayne Maly are responsible as
co-managers for the day-to-day management of the Fund's investment portfolio.


                                        9
<PAGE>   11


Mr. Davis has been a Senior Portfolio Manager of the Adviser since April 2000,
and a Vice President and Portfolio Manager of the Adviser since March 1998.
Prior to March 1998, he was the owner of Davis Equity Research, a stock research
company. Mr. Davis has been an investment professional since 1983. He has been a
co-manager of the Fund since March 1998.



Ms. Maly has been a Senior Portfolio Manager since April 2000, and a Vice
President and Portfolio Manager of the Adviser since July 1998. From July 1997
to June 1998, she was a Vice President at Morgan Stanley Asset Management Inc.
and assisted in the management of the Morgan Stanley Institutional Real Estate
Funds and the Van Kampen American Capital Real Estate Securities Fund. Prior to
July 1997, she was a Vice President and Portfolio Manager of the Adviser. Prior
to November 1992, she was a Vice President and Senior Equity Analyst for 8 years
at Texas Commerce Investment Management Company. She has been a co-manager of
the Fund since July 1998.


                               PURCHASE OF SHARES

                                    GENERAL


This Prospectus offers Class D Shares of the Fund. Class D Shares are available
for purchase exclusively by the following categories of institutional investors:
(i) tax-exempt retirement plans (Profit Sharing, 401(k), Money Purchase Pension
and Defined Benefit Plans) of Morgan Stanley Dean Witter & Co. ("Morgan Stanley
Dean Witter") and its affiliates and rollover accounts from those plans; (ii)
the following investment advisory clients of Morgan Stanley Dean Witter and its
investment advisory affiliates that invest at least $1,000,000 in the Fund:
unaffiliated benefit plans, such as qualified retirement plans (other than
individual retirement accounts and self-directed retirement plans); unaffiliated
banks and insurance companies purchasing for their own accounts; and endowment
funds of unaffiliated nonprofit organizations; (iii) investment-only accounts
for large qualified plans with at least $50,000,000 in total plan assets; and,
(iv) trust and fiduciary accounts of trust companies and bank trust departments
providing fee based advisory services that invest at least $1,000,000 in the
Fund on behalf of each trust.



Initial investments must be at least $1,000,000 for Class D Shares, and
subsequent investments must be at least $25 for Class D Shares. Minimum
investment amounts may be waived by the Distributor for plans involving periodic
investments.



Other classes of shares of the Fund may be offered through one or more separate
prospectuses of the Fund. Each class of shares of the Fund represents an
interest in the same portfolio of investments of the Fund and generally has the
same rights, except for the differing sales loads, distribution fees, services
fees and any related expenses associated with each class of shares, the
exclusive voting rights by each class with respect to any distribution plan or
service plan for such class or shares, and some classes may have different
conversion rights or shareholder servicing options.



The offering price of the Fund's Class D Shares is the Fund's net asset value
per share. The net asset value per share is determined once daily as of the
close of trading on the New York Stock Exchange (the "Exchange") (currently 4:00
p.m., New York time) each day the Exchange is open for trading except on any day
on which no purchase or redemption orders are received, or there is not
sufficient degree of trading in the Fund's portfolio securities such that the
Fund's net asset value per share might be materially affected. The Fund's Board
of Trustees reserves the right to calculate the net asset value per share and
adjust the offering price based thereon more frequently than once daily if
deemed desirable. Net asset value per share for each class is determined by
dividing the value of the Fund's portfolio securities, cash and other assets
(including accrued interest) attributable to such class, less all liabilities
(including accrued expenses) attributable to such class, by the total number of
shares of the class outstanding. Such computation is made by using prices as of
the close of trading on the Exchange and (i) valuing securities listed or traded
on a national securities exchange at the last reported sale price, or if there
has been no sale that day, at the mean between the last reported bid and asked
prices, (ii) valuing unlisted securities at the mean between the last reported
bid and asked prices available from the National Association of Securities
Dealers Automated Quotations ("NASDAQ") or brokers-dealers and (iii) valuing any
securities for which market quotations are not readily available and any other
assets at fair value as determined in good faith by the Adviser based on
procedures approved by the Board of Trustees of the Fund. Short-term securities
are valued in the manner described in the notes to the financial statements
included in the Fund's Statement of Additional Information.


                                       10
<PAGE>   12


The shares are offered to investors on a continuous basis through the
Distributor as principal underwriter, which is located at 1 Parkview Plaza,
Oakbrook Terrace, Illinois 60181-5555. Shares also are offered through members
of the NASD who are acting as securities dealers ("dealers") and NASD members or
eligible non-NASD members who are acting as brokers or agents for investors
("brokers"). "Dealers" and "brokers" are sometimes referred to herein as
"authorized dealers."



Shares may be purchased on any business day by completing the account
application form and forwarding the account application, directly or through an
authorized dealer, to the Fund's shareholder service agent, Van Kampen Investor
Services Inc. ("Investor Services"), a wholly owned subsidiary of Van Kampen
Investments. When purchasing shares of the Fund through this prospectus,
investors must specify that the purchase is for Class D Shares.



The offering price for Class D Shares is the next calculation of net asset value
per share after an order is received by Investor Services. Orders received by
authorized dealers prior to the close of the Exchange are priced based on the
date of receipt provided such order is transmitted to Investor Services prior to
Investor Services' close of business on such date. Orders received by authorized
dealers after the close of the Exchange or transmitted to Investor Services
after its close of business are priced based on the date of the next computed
net asset value per share provided they are received by Investor Services prior
to Investor Services' close of business on such date. It is the responsibility
of authorized dealers to transmit orders received by them to Investor Services
so they will be received in a timely manner.


The Fund and the Distributor reserve the right to refuse any order for the
purchase of shares. The Fund also reserves the right to suspend the sale of the
Fund's shares in response to conditions in the securities markets or for other
reasons. Shares of the Fund may be sold in foreign countries where permissible.

Investor accounts will automatically be credited with additional shares of the
Fund after any Fund distributions, such as dividends and capital gain dividends,
unless the investor instructs the Fund otherwise. Investors wishing to receive
cash instead of additional shares should contact the Fund at (800) 341-2911 or
by writing to the Fund, c/o Van Kampen Investor Services Inc., PO Box 218256,
Kansas City, MO 64121-8256.


                                 REDEMPTION OF

                                     SHARES


Generally, shareholders of Class D Shares of the Fund may redeem for cash some
or all of their shares without charge by the Fund at any time. The redemption
price will be the net asset value per share next determined after the receipt of
a request in proper form (see below). Redemptions completed through an
authorized dealer or a custodian/trustee of a retirement plan account may
involve additional fees charged by the dealer or custodian/trustee.


Except as specified below under "Telephone Redemption Requests," payment for
shares redeemed generally will be made by check mailed within seven days after
receipt by Investor Services of the request and any other necessary documents in
proper form as described below. Such payment may be postponed or the right of
redemption suspended as provided by the rules of the SEC. Such payment may,
under certain circumstances, be paid wholly or in part by a distribution-in-kind
of portfolio securities. A distribution-in-kind will result in recognition by
the shareholder of a gain or loss for federal income tax purposes when such
securities are distributed, and the shareholder may have brokerage costs and a
gain or loss for federal income tax purposes upon the shareholder's disposition
of such securities. If the shares to be redeemed have been recently purchased by
check, Investor Services may delay the payment of redemption proceeds until it
confirms that the purchase check has cleared, which may take up to 15 days. A
taxable gain or loss may be recognized by the shareholder upon redemption of
shares.

WRITTEN REDEMPTION REQUESTS. Shareholders may request a redemption of shares by
written request in proper form sent directly to Van Kampen Investor Services
Inc., PO Box 218256, Kansas City, MO 64121-8256. The request for redemption
should indicate the number of shares or dollar amount to be redeemed, the Fund
name and class designation of such shares and the shareholder's account number.
The redemption request must be signed by all persons in whose names the shares
are registered. Signatures must conform exactly to the account registration. If
the proceeds of the redemption exceed $50,000, or if the proceeds are not to be
paid to the record owner at the record address, or if the record address has
changed within the previous 30 days, signature(s) must be guaranteed by one of

                                       11
<PAGE>   13

the following: a bank or trust company; a broker-dealer; a credit union; a
national securities exchange, registered securities association or clearing
agency; a savings and loan association; or a federal savings bank.


Generally, a properly signed written request with any required signature
guarantee is all that is required for a redemption request to be in proper form.
In some cases, however, other additional documents may be necessary.
Certificated shares may be redeemed only by written consent. The certificates
for the shares being redeemed must be properly endorsed for transfer and must
accompany the redemption request.


In the case of written redemption requests sent directly to Investor Services,
the redemption price is the net asset value per share next determined after the
request in proper form is received by Investor Services.

AUTHORIZED DEALER REDEMPTION REQUESTS. Shareholders may place redemption
requests through an authorized dealer. The redemption price for such shares is
the net asset value per share next calculated after an order in proper form is
received by an authorized dealer provided such order is transmitted to the
Distributor prior to the Distributor's close of business on such day. It is the
responsibility of authorized dealers to transmit redemption requests received by
them to the Distributor so they will be received prior to such time. Redemptions
completed through an authorized dealer may involve additional fees charged by
the dealer.

TELEPHONE REDEMPTION REQUESTS. The Fund permits redemption of shares by
telephone and for redemption proceeds to be sent to the address of record for
the account or to the bank account of record as described below. A shareholder
automatically has telephone redemption privileges unless the shareholder
indicates otherwise by checking the applicable box on the account application
form. For accounts that are not established with telephone redemption
privileges, a shareholder may call the Fund at (800) 341-2911 to request that a
copy of the Telephone Redemption Authorization form be sent to the shareholder
for completion. To redeem shares, contact the telephone transaction line at
(800) 421-5684. Shares may also be redeemed by phone through FundInfo(R)
(automated phone system) which is accessible 24 hours a day, seven days a week
at (800) 847-2424. Van Kampen Investments and its subsidiaries, including
Investor Services, and the Fund employ procedures considered by them to be
reasonable to confirm that instructions communicated by telephone are genuine.
Such procedures include requiring certain personal identification information
prior to acting upon telephone instructions, tape-recording telephone
communications and providing written confirmation of instructions communicated
by telephone. If reasonable procedures are employed, none of Van Kampen
Investments, Investor Services or the Fund will be liable for following
telephone instructions which it reasonably believes to be genuine. Telephone
redemptions may not be available if the shareholder cannot reach Investor
Services by telephone, whether because all telephone lines are busy or for any
other reason; in such case, a shareholder would have to use the Fund's other
redemption procedure previously described. Requests received by Investor
Services prior to 4:00 p.m., New York time, will be processed at the next
determined net asset value per share. These privileges are available for most
accounts other than retirement accounts or accounts with shares represented by
certificates. If an account has multiple owners, Investor Services may rely on
the instructions of any one owner.

For redemptions authorized by telephone, amounts of $50,000 or less may be
redeemed daily if the proceeds are to be paid by check and amounts of at least
$1,000 up to $1 million may be redeemed daily if the proceeds are to be paid by
wire. The proceeds must be payable to the shareholder(s) of record and sent to
the address of record for the account or wired directly to their predesignated
bank account. This privilege is not available if the address of record has been
changed within 30 days prior to a telephone redemption request. Proceeds from
redemptions payable by wire transfer are expected to be wired on the next
business day following the date of redemption. The Fund reserves the right at
any time to terminate, limit or otherwise modify this redemption privilege.

OTHER REDEMPTION INFORMATION. The Fund may redeem any shareholder account that
has a value on the date of the notice of redemption less than the minimum
initial investment as specified in this prospectus. At least 60 days' advance
written notice of any such involuntary redemption will be provided to the
shareholder and such shareholder will be given an opportunity to purchase the
required value of additional shares at the next determined net asset value
without sales charge. Any involuntary redemption may only occur if the
shareholder account is less than the minimum initial investment due to
shareholder redemptions.

                                       12
<PAGE>   14

                          DISTRIBUTIONS FROM THE FUND

In addition to any increase in the value of shares which the Fund may achieve,
shareholders may receive distributions from the Fund of dividends and capital
gain dividends.

DIVIDENDS. Dividends from stocks and interest earned from other investments are
the Fund's main sources of net investment income. The Fund's present policy,
which may be changed at any time by the Fund's Board of Trustees, is to
distribute all or substantially all of its net investment income quarterly as
dividends to shareholders. Dividends are automatically applied to purchase
additional shares of the Fund at the next determined net asset value unless the
shareholder instructs otherwise.


CAPITAL GAIN DIVIDENDS. The Fund may realize capital gains or losses when it
sells securities, depending on whether the sales prices for the securities are
higher or lower than purchase prices. The Fund distributes any capital gains to
shareholders at least annually. As in the case of dividends, capital gain
dividends are automatically reinvested in additional shares of the Fund at the
next determined net asset value unless the shareholder instructs otherwise.


                              SHAREHOLDER SERVICES

Listed below are some of the shareholder services the Fund offers to investors.
For a more complete description of the Fund's shareholder services, such as
investment accounts, share certificates, retirement plans, automated clearing
house deposits, dividend diversification and the systematic withdrawal plan,
please refer to the Statement of Additional Information or contact your
authorized dealer.


REINVESTMENT PLAN. A convenient way for investors to accumulate additional
shares is by accepting dividends and capital gain dividends in shares of the
Fund. Such shares are acquired at net asset value per share on the applicable
payable date of the dividend or capital gain dividends. Unless the shareholder
instructs otherwise, the reinvestment plan is automatic. This instruction may be
made by telephone by calling (800) 341-2911 ((800) 421-2833 for the hearing
impaired) or by writing to Investor Services. The investor may, on the initial
account application or prior to any declaration, instruct that dividends and/or
capital gain dividends be paid in cash, be reinvested in the Fund at the next
determined net asset value, or be invested in another Participating Fund at the
next determined net asset value.


AUTOMATIC INVESTMENT PLAN. An automatic investment plan is available under which
a shareholder can authorize Investor Services to debit the shareholder's bank
account on a regular basis to invest predetermined amounts in the Fund.
Additional information is available from the Distributor or your authorized
dealer.

EXCHANGE PRIVILEGE. Shares of the Fund may be exchanged for shares of the same
class of any Participating Fund based on the next computed net asset value per
share of each fund after requesting the exchange without any sales charge,
subject to certain limitations. Shares of the Fund may be exchanged for shares
of any Participating Fund only if shares of that Participating Fund are
available for sale; however, during periods of suspension of sales, shares of a
Participating Fund may be available for sale only to existing shareholders of a
Participating Fund. Shareholders seeking an exchange into a Participating Fund
should obtain and read the current prospectus for such fund prior to
implementing an exchange. A prospectus of any of the Participating Funds may be
obtained from any authorized dealer or the Distributor.


Exchanges of shares are sales of shares of one Participating Fund and are
purchases of shares of another Participating Fund. The sale may result in a gain
or loss for federal income tax purposes.


If the exchanging shareholder does not have an account in the fund whose shares
are being acquired, a new account will be established with the same
registration, dividend and capital gain dividend options (except dividend
diversification) and authorized dealer of record as the account from which
shares are exchanged, unless otherwise specified by the shareholder. In order to
establish a systematic withdrawal plan for the new account or reinvest dividends
from the new account into another fund, however, an exchanging shareholder must
submit a specific request. The Fund reserves the right to reject any order to
acquire its shares through exchange. In addition, the Fund and other
Participating Funds may restrict exchanges by shareholders engaged in excessive
trading by limiting or disallowing the exchange privilege to such shareholders.
For further

                                       13
<PAGE>   15

information on these restrictions, see the Fund's Statement of Additional
Information. The Fund may modify, restrict or terminate the exchange privilege
at any time on 60 days' notice to its shareholders of any termination or
material amendment.


Exchange requests received on a business day prior to the time shares of the
funds involved in the request are priced will be processed on the date of
receipt. "Processing" a request means that shares of the fund which the
shareholder is redeeming will be redeemed at the net asset value per share next
determined on the date of receipt. Shares of the fund that the shareholder is
purchasing will also normally be purchased at the net asset value per share next
determined on the date of receipt. Exchange requests received on a business day
after the time shares of the funds involved in the request are priced will be
processed on the next business day in the manner described herein.





                            FEDERAL INCOME TAXATION

Distributions of the Fund's investment company taxable income (consisting
generally of taxable income and net short-term capital gain) are taxable to
shareholders as ordinary income, to the extent of the Fund's earnings and
profits, whether paid in cash or reinvested in additional shares. Distributions
of the Fund's net capital gain (which is the excess of net long-term capital
gain over net short-term capital loss) as capital gain dividends, if any, are
taxable to shareholders as long-term capital gains, whether paid in cash or
reinvested in additional shares, and regardless of how long the shares of the
Fund have been held by such shareholders. The Fund expects that its
distributions will consist primarily of ordinary income and capital gain
dividends. Distributions in excess of the Fund's earnings and profits will first
reduce the adjusted tax basis of a holder's shares and, after such adjusted tax
basis is reduced to zero, will constitute capital gains to such holder (assuming
such shares are held as a capital asset). Although distributions generally are
treated as taxable in the year they are paid, distributions declared in October,
November or December, payable to shareholders of record on a specified date in
such month and paid during January of the following year will be treated as
having been distributed by the Fund and received by the shareholders on the
December 31st prior to the date of payment. The Fund will inform shareholders of
the source and tax status of all distributions promptly after the close of each
calendar year.

The sale or exchange of shares may be a taxable transaction for federal income
tax purposes. Shareholders who sell their shares will generally recognize gain
or loss in an amount equal to the difference between their adjusted tax basis in
the shares sold and the amount received. If the shares are held as a capital
asset, the gain or loss will be a capital gain or loss. Any recognized capital
gains may be taxed at different rates depending on how long the shareholder held
such shares.

The Fund is required, in certain circumstances, to withhold 31% of dividends and
certain other payments, including redemptions, paid to shareholders who do not
furnish to the Fund their correct taxpayer identification number (in the case of
individuals, their social security number) and certain required certifications
or who are otherwise subject to backup withholding.

Foreign shareholders, including shareholders who are nonresident aliens, may be
subject to U.S. withholding tax on certain distributions (whether received in
cash or in shares) at a rate of 30% or such lower rate as prescribed by an
applicable treaty. Prospective foreign investors should consult their tax
advisers concerning the tax consequences to them of an investment in shares.

The Fund intends to qualify as a regulated investment company under federal
income tax law. If the Fund so qualifies and distributes each year to its
shareholders at least 90% of its investment company taxable income, the Fund
will not be required to pay federal income taxes on any income it distributes to
shareholders. If the Fund distributes less than an amount equal to the sum of
98% of its ordinary income and 98% of its capital gain net income, then the Fund
will be subject to a 4% excise tax on the undistributed amounts.

The federal income tax discussion above is for general information only.
Prospective investors should consult their own tax advisers regarding the
specific federal tax consequences of purchasing, holding and disposing of
shares, as well as the effects of state, local and foreign tax law and any
proposed tax law changes.

                                       14
<PAGE>   16

                               BOARD OF TRUSTEES
                                  AND OFFICERS

                               BOARD OF TRUSTEES

<TABLE>
<S>                   <C>
J. Miles Branagan     Richard F. Powers, III*
Jerry D. Choate       Phillip B. Rooney
Linda Hutton Heagy    Fernando Sisto
R. Craig Kennedy      Wayne W. Whalen*, Chairman
Mitchell M. Merin*    Suzanne H. Woolsey
Jack E. Nelson
</TABLE>

                                    OFFICERS

Richard F. Powers, III*
President

Stephen L. Boyd*
Executive Vice President and Chief Investment Officer

A. Thomas Smith III*
Vice President and Secretary

John H. Zimmermann, III*
Vice President


Michael H. Santo*

Vice President


Richard A. Ciccarone*


Vice President



John R. Reynoldson*


Vice President


John L. Sullivan*
Vice President, Chief Financial Officer and Treasurer

* "Interested persons" of the Fund, as defined in the Investment Company Act of
  1940, as amended.

                              FOR MORE INFORMATION

EXISTING SHAREHOLDERS OR PROSPECTIVE INVESTORS
Call your broker or (800) 341-2911
7:00 a.m. to 7:00 p.m. Central time Monday through Friday

DEALERS
For dealer information, selling agreements, wire orders, or
redemptions, call the Distributor at (800) 421-5666



WEB SITE
www.vankampen.com

VAN KAMPEN ENTERPRISE FUND
1 Parkview Plaza
PO Box 5555
Oakbrook Terrace, IL 60181-5555

Investment Adviser
VAN KAMPEN ASSET MANAGEMENT INC.
1 Parkview Plaza
PO Box 5555
Oakbrook Terrace, IL 60181-5555

Distributor
VAN KAMPEN FUNDS INC.
1 Parkview Plaza
PO Box 5555
Oakbrook Terrace, IL 60181-5555

Transfer Agent
VAN KAMPEN INVESTOR SERVICES INC.
PO Box 218256
Kansas City, MO 64121-8256
Attn: Van Kampen Enterprise Fund

Custodian
STATE STREET BANK AND TRUST COMPANY
225 West Franklin Street, PO Box 1713
Boston, MA 02105-1713
Attn: Van Kampen Enterprise Fund

Legal Counsel
SKADDEN, ARPS, SLATE, MEAGHER & FLOM (ILLINOIS)
333 West Wacker Drive
Chicago, IL 60606

Independent Accountants

ERNST & YOUNG LLP


233 South Wacker Drive


Chicago, IL 60606

<PAGE>   17

                                   VAN KAMPEN
                                ENTERPRISE  FUND

                                   PROSPECTUS

                               SEPTEMBER   , 2000


                 A Statement of Additional Information, which
                 contains more details about the Fund, is
                 incorporated by reference in its entirety into
                 this prospectus.

                 You will find additional information about the
                 Fund in its annual and semiannual reports to
                 shareholders. The annual report explains the
                 market conditions and investment strategies
                 affecting the Fund's performance during its
                 last fiscal year.

                 You can ask questions or obtain a free copy of
                 the Fund's reports or its Statement of
                 Additional Information by calling (800)
                 341-2911 from 7:00 a.m. to 7:00 p.m., Central
                 time, Monday through Friday.
                 Telecommunications Device for the Deaf users
                 may call (800) 421-2833. A free copy of the
                 Fund's reports can also be ordered from our
                 web site at www.vankampen.com.

                 Information about the Fund, including its
                 reports and Statement of Additional
                 Information, has been filed with the
                 Securities and Exchange Commission (SEC). It
                 can be reviewed and copied at the SEC's Public
                 Reference Room in Washington, DC or on the
                 EDGAR database on the SEC's internet web site
                 (http://www.sec.gov). Information on the
                 operation of the SEC's Public Reference Room
                 may be obtained by calling the SEC at
                 1-202-942-8090. You can also request copies of
                 these materials, upon payment of a duplicating
                 fee, by electronic request at the SEC's e-mail
                 address ([email protected]), or by writing
                 the Public Reference Section of the SEC,
                 Washington, DC 20549-0102.

                            [VAN KAMPEN FUNDS LOGO]


                                             The Fund's Investment Company Act
File No. is 811-630.
                                                                    ENT PRO 9/00

<PAGE>   18

      The information in this Statement of Additional Information is not
      complete and may be changed. We may not sell these securities until the
      registration statement filed with the Securities Exchange Commission is
      effective. This Statement of Additional Information is not an offer to
      sell securities and is not soliciting an offer to buy securities in any
      state where the offer or sale is not permitted.


                 SUBJECT TO COMPLETION* -- DATED JULY 27, 2000


                      STATEMENT OF ADDITIONAL INFORMATION

                                   VAN KAMPEN
                                ENTERPRISE FUND

     Van Kampen Enterprise Fund (the "Fund") is a mutual fund with the
investment objective to seek capital appreciation by investing in a portfolio of
securities consisting principally of common stocks.

     The Fund is organized as a diversified series of Van Kampen Enterprise
Fund, an open-end, management investment company (the "Trust").


     This Statement of Additional Information is not a prospectus. This
Statement of Additional Information should be read in conjunction with the
Fund's Class D Share prospectus dated September   , 2000 and Class A Share,
Class B Share and Class C Share prospectus dated April 28, 2000, as supplemented
(collectively the "Prospectus"). This Statement of Additional Information does
not include all the information that a prospective investor should consider
before purchasing shares of the Fund. Investors should obtain and read the
Prospectus prior to purchasing shares of the Fund. A Prospectus may be obtained
without charge by writing or calling Van Kampen Funds Inc. at 1 Parkview Plaza,
PO Box 5555, Oakbrook Terrace, Illinois 60181-5555 or (800) 341-2911 or (800)
421-2833 for the hearing impaired).


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

                               TABLE OF CONTENTS
                 ---------------------------------------------


<TABLE>
<CAPTION>
                                                                Page
                                                                ----
<S>                                                             <C>
General Information.........................................    B-2
Investment Objective, Policies and Risks....................    B-3
Options, Futures Contracts and Related Options..............    B-6
Investment Restrictions.....................................    B-13
Trustees and Officers.......................................    B-15
Investment Advisory Agreement...............................    B-24
Other Agreements............................................    B-25
Distribution and Service....................................    B-25
Transfer Agent..............................................    B-30
Portfolio Transactions and Brokerage Allocation.............    B-30
Shareholder Services........................................    B-32
Redemption of Shares........................................    B-34
Contingent Deferred Sales Charge-Class A....................    B-35
Waiver of Class B and Class C Contingent Deferred Sales
  Charges...................................................    B-35
Taxation....................................................    B-37
Fund Performance............................................    B-42
Other Information...........................................    B-46
Report of Independent Accountants...........................    F-1
Financial Statements........................................    F-2
Notes to Financial Statements...............................    F-13
</TABLE>



     THIS STATEMENT OF ADDITIONAL INFORMATION IS DATED SEPTEMBER   , 2000.


                                                                    ENT SAI 9/00

<PAGE>   19

                              GENERAL INFORMATION

     The Fund was originally incorporated in Delaware on September 18, 1953,
under the name American Capital Enterprise Fund, Inc. The Fund was
reincorporated by merger as a Maryland corporation on January 12, 1979, under
the same name. As of August 5, 1995, the Fund was reorganized under the name Van
Kampen American Capital Enterprise Fund as a series of the Trust. The Trust is
organized as a business trust under the laws of the State of Delaware. On July
14, 1998, the Fund and the Trust adopted their present names.

     Van Kampen Asset Management Inc. (the "Adviser" or "Asset Management"), Van
Kampen Funds Inc. (the "Distributor"), and Van Kampen Investor Services Inc.
("Investor Services") are wholly owned subsidiaries of Van Kampen Investments
Inc. ("Van Kampen Investments"), which is an indirect wholly owned subsidiary of
Morgan Stanley Dean Witter & Co. ("Morgan Stanley Dean Witter"). The principal
office of the Fund, the Adviser, the Distributor and Van Kampen Investments is
located at 1 Parkview Plaza, Oakbrook Terrace, Illinois 60181-5555. The
principal office of Investor Services is located at 7501 Tiffany Springs
Parkway, Kansas City, Missouri 64153.

     Morgan Stanley Dean Witter is a preeminent global financial services firm
that maintains leading market positions in each of its three primary businesses:
securities, asset management and credit services.

     The authorized capitalization of the Trust consists of an unlimited number
of shares of beneficial interest, par value $0.01 per share, which can be
divided into series, such as the Fund, and further subdivided into classes of
each series. Each share represents an equal proportionate interest in the assets
of the series with each other share in such series and no interest in any other
series. No series is subject to the liabilities of any other series. The
Declaration of Trust provides that shareholders are not liable for any
liabilities of the Trust or any of its series, requires inclusion of a clause to
that effect in every agreement entered into by the Trust or any of its series
and indemnifies shareholders against any such liability.


     The Fund currently offers four classes of shares, designated Class A
Shares, Class B Shares, Class C Shares and Class D Shares. Other classes may be
established from time to time in accordance with provisions of the Declaration
of Trust. Each class of shares of the Fund generally is identical in all
respects except that each class bears certain distribution expenses and has
exclusive voting rights with respect to its distribution fee. Shares of the
Trust entitle their holders to one vote per share; however, separate votes are
taken by each series on matters affecting an individual series and separate
votes are taken by each class of a series on matters affecting an individual
class of such series. For example, a change in investment policy for a series
would be voted upon by shareholders of only the series involved and a change in
the distribution fee for a class of a series would be voted upon by shareholders
of only the class of such series involved. Except as otherwise described in the
Prospectus or herein, shares do not have cumulative voting rights, preemptive
rights or any conversion, subscription or exchange rights.


     The Trust does not contemplate holding regular meetings of shareholders to
elect Trustees or otherwise. However, the holders of 10% or more of the
outstanding shares may by written request require a meeting to consider the
removal of Trustees by a vote of a majority of the shares then outstanding cast
in person or by proxy at such meeting. The

                                       B-2
<PAGE>   20

Fund will assist such holders in communicating with other shareholders of the
Fund to the extent required by the Investment Company Act of 1940, as amended
(the "1940 Act"), or rules or regulations promulgated by the Securities and
Exchange Commission ("SEC").


     In the event of liquidation, each of the shares of the Fund is entitled to
its portion of all of the Fund's net assets after all debts and expenses of the
Fund have been paid. Since Class B Shares and Class C Shares have higher
distribution fees and transfer agency costs, the liquidation proceeds to holders
of Class B Shares and Class C Shares are likely to be less than to holders of
Class A Shares and Class D Shares.


     The Trustees may amend the Declaration of Trust (including with respect to
any series) in any manner without shareholder approval, except that the Trustees
may not adopt any amendment adversely affecting the rights of shareholders of
any series without approval by a majority of the shares of each affected series
outstanding and entitled to vote (or such higher vote as may be required by the
1940 Act or other applicable law) and except that the Trustees cannot amend the
Declaration of Trust to impose any liability on shareholders, make any
assessment on shares or impose liabilities on the Trustees without approval from
each affected shareholder or Trustee, as the case may be.

     Statements contained in this Statement of Additional Information as to the
contents of any contract or other document referred to are not necessarily
complete, and, in each instance, reference is made to the copy of such contract
or other document filed as an exhibit to the Registration Statement of which
this Statement of Additional Information forms a part, each such statement being
qualified in all respects by such reference.


     As of September   , 2000, no person was known by the Fund to own
beneficially or to hold of record 5% or more of the outstanding Class A Shares,
Class B Shares, Class C Shares or Class D Shares of the Fund, except as follows:



<TABLE>
<CAPTION>
                                                 Amount of
                                                Ownership at           Class        Percentage
        Name and Address of Holder            September , 2000       of Shares      Ownership
        --------------------------           ------------------      ---------      ----------
<S>                                          <C>                     <C>            <C>

</TABLE>


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

     Van Kampen Trust Company acts as custodian for certain employee benefit
plans
and individual retirement accounts.

                    INVESTMENT OBJECTIVE, POLICIES AND RISKS

     The following disclosures supplements the disclosure set forth under the
same caption in the Prospectus and does not, standing alone, present a complete
or accurate explanation of the matters disclosed. Readers must refer also to
this caption in the Prospectus for a complete presentation of the matters
disclosed below.

                                       B-3
<PAGE>   21

REPURCHASE AGREEMENTS

     The Fund may engage in repurchase agreements with broker-dealers, banks and
other financial institutions in order to earn a return on temporarily available
cash. A repurchase agreement is a short-term investment in which the purchaser
(i.e., the Fund) acquires ownership of a security and the seller agrees to
repurchase the obligation at a future time and set price, thereby determining
the yield during the holding period. Repurchase agreements involve certain risks
in the event of default by the other party. The Fund may enter into repurchase
agreements with broker-dealers, banks and other financial institutions deemed to
be creditworthy by the Adviser under guidelines approved by the Fund's Board of
Trustees. The Fund will not invest in repurchase agreements maturing in more
than seven days if any such investment, together with any other illiquid
securities held by the Fund, would exceed the Fund's limitation on illiquid
securities described herein. The Fund does not bear the risk of a decline in
value of the underlying security unless the seller defaults under its repurchase
obligation. In the event of the bankruptcy or other default of a seller of a
repurchase agreement, the Fund could experience both delays in liquidating the
underlying securities and losses including: (a) possible decline in the value of
the underlying security during the period while the Fund seeks to enforce its
rights thereto; (b) possible lack of access to income on the underlying security
during this period; and (c) expenses of enforcing its rights.

     For the purpose of investing in repurchase agreements, the Adviser may
aggregate the cash that certain funds advised or subadvised by the Adviser or
certain of its affiliates would otherwise invest separately into a joint
account. The cash in the joint account is then invested in repurchase agreements
and the funds that contributed to the joint account share pro rata in the net
revenue generated. The Adviser believes that the joint account produces
efficiencies and economies of scale that may contribute to reduced transaction
costs, higher returns, higher quality investments and greater diversity of
investments for the Fund than would be available to the Fund investing
separately. The manner in which the joint account is managed is subject to
conditions set forth in an exemptive order from the SEC permitting this
practice, which conditions are designed to ensure the fair administration of the
joint account and to protect the amounts in that account.

     Repurchase agreements are fully collateralized by the underlying securities
and are considered to be loans under the 1940 Act. The Fund pays for such
securities only upon physical delivery or evidence of book entry transfer to the
account of a custodian or bank acting as agent. The seller under a repurchase
agreement will be required to maintain the value of the underlying securities
marked-to-market daily at not less than the repurchase price. The underlying
securities (normally securities of the U.S. government, its agencies or
instrumentalities) may have maturity dates exceeding one year.

WARRANTS

     Warrants are in effect longer-term call options. They give the holder the
right to purchase a given number of shares of a particular company at specified
prices within certain periods of time. The purchaser of a warrant expects that
the market price of the security will exceed the purchase price of the warrant
plus the exercise price of the warrant, thus giving him a profit. Of course,
since the market price may never exceed the exercise price before the expiration
date of the warrant, the purchaser of the warrant risks the loss of the entire
purchase price of the warrant. Warrants generally trade in the open

                                       B-4
<PAGE>   22

market and may be sold rather than exercised. Warrants are sometimes sold in
unit form with other securities of an issuer. Units of warrants and common stock
may be employed in financing young, unseasoned companies. The purchase price of
a warrant varies with the exercise price of the warrant, the current market
value of the underlying security, the life of the warrant and various other
investment factors.

SECURITIES OF FOREIGN ISSUERS

     The Fund may purchase foreign securities in the form of American Depositary
Receipts ("ADRs") and European Depositary Receipts ("EDRs") or other securities
representing underlying shares of foreign companies. These securities are not
necessarily denominated in the same currency as the underlying securities but
generally are denominated in the currency of the market in which they are
traded. ADRs are receipts typically issued by an American bank or trust company
which evidence ownership of underlying securities issued by a foreign
corporation. ADRs are publicly traded on exchanges or over-the-counter in the
United States and are issued through "sponsored" or "unsponsored" arrangements.
In a sponsored ADR arrangement, the foreign issuer assumes the obligation to pay
some or all of the depositary's transaction fees, whereas under an unsponsored
arrangement, the foreign issuer assumes no obligations and the depositary's
transaction fees are paid by the ADR holders. In addition, less information is
available in the United States about an unsponsored ADR than about a sponsored
ADR and financial information about a company may not be as reliable for an
unsponsored ADR as for a sponsored ADR. The Fund may invest in ADRs through both
sponsored and unsponsored arrangements. EDRs are receipts issued in Europe by
banks or depositaries which evidence a similar ownership arrangement.

PORTFOLIO TURNOVER

     The Fund's portfolio turnover rate is calculated by dividing the lesser of
purchases or sales of portfolio securities for a fiscal year by the average
monthly value of the Fund's portfolio securities during such fiscal year. The
turnover rate may vary greatly from year to year as well as within a year.

ILLIQUID SECURITIES

     The Fund may invest up to 10% of its net assets in illiquid securities,
which includes securities that are not readily marketable, repurchase agreements
which have a maturity of longer than seven days, and generally includes
securities that are restricted from sale to the public without registration
under the Securities Act of 1933, as amended (the "1933 Act"). The sale of such
securities often requires more time and results in higher brokerage charges or
dealer discounts and other selling expenses than does the sale of liquid
securities trading on national securities exchanges or in the over-the-counter
markets. Restricted securities are often purchased at a discount from the market
price of unrestricted securities of the same issuer reflecting the fact that
such securities may not be readily marketable without some time delay.
Investments in securities for which market quotations are not readily available
are valued at fair value as determined in good faith by the Adviser in
accordance with procedures approved by the Fund's Board of Trustees. Ordinarily,
the Fund would invest in restricted securities only when it receives the
issuer's commitment to register the securities without expense to the Fund.
However, registration

                                       B-5
<PAGE>   23

and underwriting expenses (which typically range from 7% to 15% of the gross
proceeds of the securities sold) may be paid by the Fund. Restricted securities
which can be offered and sold to qualified institutional buyers under Rule 144A
under the 1933 Act ("144A Securities") and are determined to be liquid under
guidelines adopted by and subject to the supervision of the Fund's Board of
Trustees are not subject to the limitation on illiquid securities. Such 144A
Securities are subject to monitoring and may become illiquid to the extent
qualified institutional buyers become, for a time, uninterested in purchasing
such securities. Factors used to determine whether 144A Securities are liquid
include, among other things, a security's trading history, the availability of
reliable pricing information, the number of dealers making quotes or making a
market in such security and the number of potential purchasers in the market for
such security. For purposes hereof, investments by the Fund in securities of
other investment companies will not be considered investments in restricted
securities to the extent permitted by (i) the 1940 Act, (ii) the rules and
regulations promulgated by the SEC under the 1940 Act, as amended from time to
time, or (iii) an exemption or other relief (such as "no action" letters issued
by the staff of the SEC interpreting or providing guidance on the 1940 Act or
regulations thereunder) from the provisions of the 1940 Act, as amended from
time to time.

                 OPTIONS, FUTURES CONTRACTS AND RELATED OPTIONS

     The Fund may, but is not required to, use various investment strategies as
described below to earn income, facilitate portfolio management and mitigate
risks. Techniques and instruments may change over time as new instruments and
strategies are developed or regulatory changes occur. Although the Fund's
Adviser seeks to use such transactions to further the Fund's investment
objective, no assurance can be given that the use of these transactions will
achieve this result.

Selling Call and Put Options

     Purpose. The principal reason for selling options is to obtain, through
receipt of premiums, a greater current return than would be realized on the
underlying securities alone. Such current return could be expected to fluctuate
because premiums earned from an option selling program and dividend or interest
income yields on portfolio securities vary as economic and market conditions
change. Selling options on portfolio securities is likely to result in a higher
portfolio turnover rate.

     Selling Options. The purchaser of a call option pays a premium to the
seller (i.e., the writer) for the right to buy the underlying security from the
seller at a specified price during a certain period. The Fund would write call
options only on a covered basis or for cross-hedging purposes. A call option is
covered if, at all times during the option period, the Fund would own or have
the right to acquire securities of the type that it would be obligated to
deliver if any outstanding option were exercised. An option is for cross-hedging
purposes if it is not covered by the security subject to the option, but is
designed to provide a hedge against another security which the Fund owns or has
the right to acquire. In such circumstances, the Fund collateralizes the option
by maintaining in a segregated account with the Fund's custodian cash or liquid
securities in an amount not less than the market value of the underlying
security, marked to market daily, while the option is outstanding.

                                       B-6
<PAGE>   24

     The purchaser of a put option pays a premium to the seller (i.e., the
writer) for the right to sell the underlying security to the writer at a
specified price during a certain period. The Fund would sell put options only on
a secured basis, which means that, at all times during the option period, the
Fund would maintain in a segregated account with its custodian cash or liquid
securities in an amount of not less than the exercise price of the option, or
would hold a put on the same underlying security at an equal or greater exercise
price.

     Closing Purchase Transactions and Offsetting Transactions. In order to
terminate its position as a writer of a call or put option, the Fund could enter
into a "closing purchase transaction," which is the purchase of a call (put) on
the same underlying security and having the same exercise price and expiration
date as the call (put) previously sold by the Fund. The Fund would realize a
gain (loss) if the premium plus commission paid in the closing purchase
transaction is lesser (greater) than the premium it received on the sale of the
option. The Fund would also realize a gain if an option it has written lapses
unexercised.

     The Fund could sell options that are listed on an exchange as well as
options which are privately negotiated in over-the-counter transactions. The
Fund could close out its position as a seller of an option only if a liquid
secondary market exists for options of that series, but there is no assurance
that such a market will exist, particularly in the case of over-the-counter
options, since they can be closed out only with the other party to the
transaction. Alternatively, the Fund could purchase an offsetting option, which
would not close out its position as a seller, but would provide an asset of
equal value to its obligation under the option sold. If the Fund is not able to
enter into a closing purchase transaction or to purchase an offsetting option
with respect to an option it has sold, it will be required to maintain the
securities subject to the call or the collateral securing the option until a
closing purchase transaction can be entered into (or the option is exercised or
expires) even though it might not be advantageous to do so. The staff of the SEC
currently takes the position that, in general, over-the-counter options on
securities purchased by the Fund, and portfolio securities "covering" the amount
of the Fund's obligation pursuant to an over-the-counter option sold by it (the
cost of the sell-back plus the in-the-money amount, if any) are illiquid, and
are subject to the Fund's limitation on illiquid securities described herein.

     Risks of Writing Options. By selling a call option, the Fund loses the
potential for gain on the underlying security above the exercise price while the
option is outstanding; by selling a put option the Fund might become obligated
to purchase the underlying security at an exercise price that exceeds the then
current market price.

PURCHASING CALL AND PUT OPTIONS

     The Fund could purchase call options to protect against anticipated
increases in the prices of securities it wishes to acquire. Alternatively, call
options could be purchased for capital appreciation. Since the premium paid for
a call option is typically a small fraction of the price of the underlying
security, a given amount of funds will purchase call options covering a much
larger quantity of such security than could be purchased directly. By purchasing
call options, the Fund could benefit from any significant increase in the price
of the underlying security to a greater extent than had it invested the same
amount in the security directly. However, because of the very high volatility of
option premiums, the

                                       B-7
<PAGE>   25

Fund would bear a significant risk of losing the entire premium if the price of
the underlying security did not rise sufficiently, or if it did not do so before
the option expired.

     Put options may be purchased to protect against anticipated declines in the
market value of either specific portfolio securities or of the Fund's assets
generally. Alternatively, put options may be purchased for capital appreciation
in anticipation of a price decline in the underlying security and a
corresponding increase in the value of the put option. The purchase of put
options for capital appreciation involves the same significant risk of loss as
described above for call options.

     In any case, the purchase of options for capital appreciation would
increase the Fund's volatility by increasing the impact of changes in the market
price of the underlying securities on the Fund's net asset value.

OPTIONS ON STOCK INDICES

     Options on stock indices are similar to options on stock, but the delivery
requirements are different. Instead of giving the right to take or make delivery
of stock at a specified price, an option on a stock index gives the holder the
right to receive an amount of cash which amount will depend upon the closing
level of the stock index upon which the option is based being greater than (in
the case of a call) or less than (in the case of a put) the exercise price of
the option. The amount of cash received will be the difference between the
closing price of the index and the exercise price of the option, multiplied by a
specified dollar multiple. The writer of the option is obligated, in return for
the premium received, to make delivery of this amount.

     Some stock index options are based on a broad market index such as the
Standard & Poor's 500 or the New York Stock Exchange Composite Index, or a
narrower index such as the Standard & Poor's 100. Indices are also based on an
industry or market segment such as the AMEX Oil and Gas Index or the Computer
and Business Equipment Index. A stock index fluctuates with changes in the
market values of the stocks included in the index. Options are currently traded
on several exchanges.

     Gain or loss to the Fund on transactions in stock index options will depend
on price movements in the stock market generally (or in a particular industry or
segment of the market) rather than price movements of individual securities. As
with stock options, the Fund may offset its position in stock index options
prior to expiration by entering into a closing transaction on an exchange, or it
may let the option expire unexercised.

FUTURES CONTRACTS

     The Fund may engage in transactions involving futures contracts and related
options in accordance with the rules and interpretations of the Commodity
Futures Trading Commission ("CFTC") under which the Fund would be exempt from
registration as a "commodity pool."

     A stock index futures contract is an agreement pursuant to which a party
agrees to take or make delivery of an amount of cash equal to a specified dollar
amount multiplied by the difference between the stock index value at a specified
time and the price at which the futures contract originally was struck. No
physical delivery of the underlying stocks in the index is made.

                                       B-8
<PAGE>   26

     Currently, stock index futures contracts can be purchased with respect to
several indices on various exchanges. Differences in the stocks included in the
indices may result in differences in correlation of the futures contracts with
movements in the value of the securities being hedged.

     The Fund also may invest in foreign stock index futures traded outside the
United States which involve additional risks including fluctuations in foreign
exchange rates, foreign currency exchange controls, political and economic
instability, differences in financial reporting and securities regulation and
trading, and foreign taxation issues.

     An interest rate futures contract is an agreement pursuant to which a party
agrees to take or make delivery of a specified debt security (such as U.S.
Treasury bonds or notes) at a specified future time and at a specified price.

     Initial and Variation Margin. In contrast to the purchase or sale of a
security, no price is paid or received upon the purchase or sale of a futures
contract. Initially, the Fund is required to deposit with its custodian in an
account in the broker's name an amount of cash or liquid securities equal to a
percentage (which will normally range between 2% and 10%) of the contract
amount. This amount is known as initial margin. The nature of initial margin in
futures transactions is different from that of margin in securities transactions
in that futures contract margin does not involve the borrowing of funds by the
customer to finance the transaction. Rather, the initial margin is in the nature
of a performance bond or good faith deposit on the contract, which is returned
to the Fund upon termination of the futures contract and satisfaction of its
contractual obligations. Subsequent payments to and from the broker, called
variation margin, are made on a daily basis as the price of the underlying
securities or index fluctuates, making the long and short positions in the
futures contract more or less valuable, a process known as marking to market.

     For example, when the Fund purchases a futures contract and the price of
the underlying security or index rises, that position increases in value, and
the Fund receives from the broker a variation margin payment equal to that
increase in value. Conversely, where the Fund purchases a futures contract and
the value of the underlying security or index declines, the position is less
valuable, and the Fund is required to make a variation margin payment to the
broker.

     At any time prior to expiration of the futures contract, the Fund may elect
to terminate the position by taking an opposite position. A final determination
of variation margin is then made, additional cash is required to be paid by or
released to the Fund, and the Fund realizes a loss or a gain.

     Futures Strategies. When the Fund anticipates a significant market or
market sector advance, the purchase of a futures contract affords a hedge
against not participating in the advance at a time when the Fund is otherwise
fully invested ("anticipatory hedge"). Such purchase of a futures contract would
serve as a temporary substitute for the purchase of individual securities, which
may be purchased in an orderly fashion once the market has stabilized. As
individual securities are purchased, an equivalent amount of futures contracts
could be terminated by offsetting sales. The Fund may sell futures contracts in
anticipation of or in a general market or market sector decline that may
adversely affect the market value of the Fund's securities ("defensive hedge").
To the extent that the Fund's portfolio of securities changes in value in
correlation with the underlying security or index, the sale of futures contracts
would substantially reduce the risk to the Fund of a market decline and, by so
doing, provides an alternative to the liquidation of securities positions in the

                                       B-9
<PAGE>   27

Fund. Ordinarily transaction costs associated with futures transactions are
lower than transaction costs that would be incurred in the purchase and sale of
securities.

     Special Risks Associated with Futures Transactions. There are several risks
connected with the use of futures contracts. These include the risk of imperfect
correlation between movements in the price of the futures contracts and of the
underlying securities or index; the risk of market distortion; the risk of
illiquidity; and the risk of error in anticipating price movement.

     There may be an imperfect correlation (or no correlation) between movements
in the price of the futures contracts and of the securities being hedged. The
risk of imperfect correlation increases as the composition of the securities
being hedged diverges from the securities upon which the futures contract is
based. If the price of the futures contract moves less than the price of the
securities being hedged, the hedge will not be fully effective. To compensate
for the imperfect correlation, the Fund could buy or sell futures contracts in a
greater dollar amount than the dollar amount of securities being hedged if the
historical volatility of the securities being hedged is greater than the
historical volatility of the securities underlying the futures contract.
Conversely, the Fund could buy or sell futures contracts in a lesser dollar
amount than the dollar amount of securities being hedged if the historical
volatility of the securities being hedged is less than the historical volatility
of the securities underlying the futures contracts. It is also possible that the
value of futures contracts held by the Fund could decline at the same time as
portfolio securities being hedged; if this occurred, the Fund would lose money
on the futures contract in addition to suffering a decline in value in the
portfolio securities being hedged.

     There is also the risk that the price of futures contracts may not
correlate perfectly with movements in the securities or index underlying the
futures contract due to certain market distortions. First, all participants in
the futures market are subject to margin depository and maintenance
requirements. Rather than meet additional margin depository requirements,
investors may close futures contracts through offsetting transactions, which
could distort the normal relationship between the futures market and the
securities or index underlying the futures contract. Second, from the point of
view of speculators, the deposit requirements in the futures market are less
onerous than margin requirements in the securities markets. Therefore, increased
participation by speculators in the futures markets may cause temporary price
distortions. Due to the possibility of price distortion in the futures markets
and because of the imperfect correlation between movements in futures contracts
and movements in the securities underlying them, a correct forecast of general
market trends by the Adviser may still not result in a successful hedging
transaction.

     There is also the risk that futures markets may not be sufficiently liquid.
Futures contracts may be closed out only on an exchange or board of trade that
provides a market for such futures contracts. Although the Fund intends to
purchase or sell futures only on exchanges and boards of trade where there
appears to be an active secondary market, there can be no assurance that an
active secondary market will exist for any particular contract or at any
particular time. In the event of such illiquidity, it might not be possible to
close a futures position and, in the event of adverse price movement, the Fund
would continue to be required to make daily payments of variation margin. Since
the securities being hedged would not be sold until the related futures contract
is sold, an increase, if any, in the price of the securities may to some extent
offset losses on the related futures

                                      B-10
<PAGE>   28

contract. In such event, the Fund would lose the benefit of the appreciation in
value of the securities.

     Successful use of futures is also subject to the Adviser's ability to
correctly predict the direction of movements in the market. For example, if the
Fund hedges against a decline in the market, and market prices instead advance,
the Fund will lose part or all of the benefit of the increase in value of its
securities holdings because it will have offsetting losses in futures contracts.
In such cases, if the Fund has insufficient cash, it may have to sell portfolio
securities at a time when it is disadvantageous to do so in order to meet the
daily variation margin.

     Although the Fund intends to enter into futures contracts only if there is
an active market for such contracts, there is no assurance that an active market
will exist for the contracts at any particular time. Most U.S. futures exchanges
and boards of trade limit the amount of fluctuation permitted in futures
contract prices during a single trading day. Once the daily limit has been
reached in a particular contract, no trades may be made that day at a price
beyond that limit. It is possible that futures contract prices would move to the
daily limit for several consecutive trading days with little or no trading,
thereby preventing prompt liquidation of futures positions and subjecting some
futures traders to substantial losses. In such event, and in the event of
adverse price movements, the Fund would be required to make daily cash payments
of variation margin. In such circumstances, an increase in the value of the
portion of the portfolio being hedged, if any, may partially or completely
offset losses on the futures contract. However, as described above, there is no
guarantee that the price of the securities being hedged will, in fact, correlate
with the price movements in a futures contract and thus provide an offset to
losses on the futures contract.

     The Fund will not enter into futures contracts or options transactions
(except for closing transactions) other than for bona fide hedging purposes if,
immediately thereafter, the sum of its initial margin and premiums on open
futures contracts and options exceed 5% of the fair market value of the Fund's
assets; however, in the case of an option that is in-the-money at the time of
purchase, the in-the-money amount may be excluded in calculating the 5%
limitation. In order to prevent leverage in connection with the purchase of
futures contracts by the Fund, an amount of cash or liquid securities equal to
the market value of the obligation under the futures contracts (less any related
margin deposits) will be maintained in a segregated account with the custodian.

OPTIONS ON FUTURES CONTRACTS

     The Fund could also purchase and write options on futures contracts. An
option on a futures contract gives the purchaser the right, in return for the
premium paid, to assume a position in a futures contract (a long position if the
option is a call and a short position if the option is a put) at a specified
exercise price at any time during the option period. As a writer of an option on
a futures contract, the Fund would be subject to initial margin and maintenance
requirements similar to those applicable to futures contracts. In addition, net
option premiums received by the Fund are required to be included as initial
margin deposits. When an option on a futures contract is exercised, delivery of
the futures position is accompanied by cash representing the difference between
the current market price of the futures contract and the exercise price of the
option. The Fund could purchase put options on futures contracts in lieu of, and
for the same purposes as, the sale of a futures contract; at the same time, it
could write put options at a lower strike price (a "put bear spread")

                                      B-11
<PAGE>   29

to offset part of the cost of the strategy to the Fund. The purchase of call
options on futures contracts is intended to serve the same purpose as the actual
purchase of the futures contracts.

     Risks of Transactions in Options on Futures Contracts. In addition to the
risks described above which apply to all options transactions, there are several
special risks relating to options on futures. The Adviser will not purchase
options on futures on any exchange unless in the Adviser's opinion, a liquid
secondary exchange market for such options exists. Compared to the use of
futures, the purchase of options on futures involves less potential risk to the
Fund because the maximum amount at risk is the premium paid for the options
(plus transaction costs). However, there may be circumstances, such as when
there is no movement in the price of the underlying security or index, when the
use of an option on a future would result in a loss to the Fund when the use of
a future would not.

ADDITIONAL RISKS OF OPTIONS, FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS

     Each of the exchanges has established limitations governing the maximum
number of call or put options on the same underlying security or futures
contract (whether or not covered) which may be written by a single investor,
whether acting alone or in concert with others (regardless of whether such
options are written on the same or different exchanges or are held or written on
one or more accounts or through one or more brokers). Option positions of all
investment companies advised by the Adviser are combined for purposes of these
limits. An exchange may order the liquidation of positions found to be in
violation of these limits and it may impose other sanctions or restrictions.
These position limits may restrict the number of listed options which the Fund
may write.

     In the event of the bankruptcy of a broker through which the Fund engages
in transactions in options, futures or related options, the Fund could
experience delays or losses in liquidating open positions purchased or incur a
loss of all or part of its margin deposits with the broker. Transactions are
entered into by the Fund only with brokers or financial institutions deemed
creditworthy by the Adviser.

USE OF SEGREGATED AND OTHER SPECIAL ACCOUNTS

     Many derivative transactions, in addition to other requirements, require
that the Fund segregate cash and liquid securities with its custodian to the
extent the Fund's obligations are not otherwise "covered" as described above. In
general, either the full amount of any obligation by the Fund to pay or deliver
securities or assets must be covered at all times by the securities, instruments
or currency required to be delivered (or securities convertible into the needed
securities without additional consideration), or, subject to applicable
regulatory restrictions, an amount of cash or liquid securities at least equal
to the current amount of the obligation must be segregated with the custodian.
The segregated assets cannot be sold or transferred unless equivalent assets are
substituted in their place or it is no longer necessary to segregate them. In
the case of a futures contract or an option thereon, the Fund must deposit
initial margin and possible daily variation margin in addition to segregating
cash and liquid securities sufficient to meet its obligation to purchase or
provide securities or currencies, or to pay the amount owed at the expiration of
an index-based futures contract. Derivative transactions may be covered by other
means

                                      B-12
<PAGE>   30

when consistent with applicable regulatory policies. The Fund may also enter
into offsetting transactions so that its combined position, coupled with any
segregated cash and liquid securities, equals its net outstanding obligation.

                            INVESTMENT RESTRICTIONS

     The Fund has adopted the following fundamental investment restrictions
which may not be changed without shareholder approval by the vote of a majority
of its outstanding voting securities which is defined by the 1940 Act as the
lesser of (i) 67% or more of the Fund's voting securities present at a meeting,
if the holders of more than 50% of the outstanding voting securities of the Fund
are present or represented by proxy; or (ii) more than 50% of the Fund's
outstanding voting securities. The percentage limitations contained in the
restrictions and policies set forth herein apply at the time of purchase of
securities. With respect to the limitations on illiquid securities and
borrowings, the percentage limitations apply at the time of purchase and on an
ongoing basis. The Fund shall not:

      1. Make loans except that the Fund may invest up to 25% of the Fund's
         total assets in repurchase agreements;

      2. Sell short or buy on margin, but the Fund may engage in transaction in
         options, futures contracts and related options and make margin deposits
         and payments in connection therewith;

      3. Primarily engage in the underwriting or distribution of securities;

      4. Make any investment in real estate, commodities or commodities
         contracts; however, the Fund is not prohibited from investing in
         securities issued by a real estate investment trust, provided that such
         trust is not permitted to invest in real estate or interests in real
         estate other than mortgages or other security interests, and the Fund
         is not prohibited from entering into transactions in futures contracts
         and related options;

      5. Make any investment in any security about which information is not
         available with respect to history, management, assets, earnings, and
         income of the issuer, except that the Fund may purchase securities of
         other investment companies to the extent permitted (i) the 1940 Act, as
         amended from time to time, (ii) the rules and regulations promulgated
         by the SEC under the 1940 Act, as amended from time to time, or (iii)
         an exemption or other relief from the provisions of the 1940 Act;

      6. Make any investment which involves promotion or business management by
         the Fund or which would subject the Fund to unlimited liability;

      7. Invest more than 5% of the value of its assets in the securities of any
         one issuer (with the exception of U.S. Government securities) or
         purchase more than 10% of the outstanding voting securities of any one
         issuer, except that the Fund may purchase securities of other
         investment companies to the extent permitted by (i) the 1940 Act, as
         amended from time to time, (ii) the rules and regulations promulgated
         by the SEC under the 1940 Act, as amended from time to time, or (iii)
         an exemption or other relief from the provisions of the 1940 Act;

                                      B-13
<PAGE>   31

      8. Invest more than 25% of the value of its assets in securities issued by
         companies in any one industry, except that the Fund may purchase
         securities of other investment companies to the extent permitted by (i)
         the 1940 Act, as amended from time to time, (ii) the rules and
         regulations promulgated by the SEC under the 1940 Act, as amended from
         time to time, or (iii) an exemption or other relief from the provisions
         of the 1940 Act;

      9. Borrow more than 10% of the value of its net assets valued at the lower
         of cost or market at the time of borrowing; and then only from banks
         and undertaken as a temporary measure for extraordinary or emergency
         purposes; or pledge, transfer, assign or otherwise encumber its assets
         except to secure such borrowing and in an amount not exceeding the
         amount of the borrowing. Notwithstanding the foregoing, the Fund may
         engage in transactions in options, futures contracts and related
         options, segregate or deposit assets to cover or secure options
         written, and make margin deposits or payments for futures contracts and
         related options;

     10. Invest in companies for the purpose of exercising control, except that
         the Fund may purchase securities of other investment companies to the
         extent permitted by (i) the 1940 Act, as amended from time to time,
         (ii) the rules and regulations promulgated by the SEC under the 1940
         Act, as amended from time to time, or (iii) an exemption or other
         relief from the provisions of the 1940 Act;

     11. Invest in securities issued by other investment companies except as
         part of a merger, reorganization or other acquisition and except that
         the Fund may purchase securities of other investment companies to the
         extent permitted by (i) the 1940 Act, as amended from time to time,
         (ii) the rules and regulations promulgated by the SEC under the 1940
         Act, as amended from time to time, or (iii) an exemption or other
         relief from the provisions of the 1940 Act; or

     12. Issue senior securities, as defined in the 1940 Act, except that this
         restriction shall not be deemed to prohibit the Fund from (i) making
         and collateralizing any permitted borrowings, (ii) making any permitted
         loans of its portfolio securities, or (iii) entering into repurchase
         agreements, utilizing options, futures contracts, options on futures
         contracts and other investment strategies and instruments that would be
         considered "senior securities" but for the maintenance by the Fund of a
         segregated account with its custodian or some other form of "cover".

     In addition to the foregoing, the Fund has adopted additional investment
restrictions which may be changed by the Trustees without a vote of
shareholders. These restrictions provide that the Fund may not:

      1. Invest more than 5% of the value of its total assets in securities of
         companies which (including predecessor companies or operations) have
         been in business less than three years, except that the Fund may
         purchase securities of other investment companies to the extent
         permitted by (i) the 1940 Act, as amended from time to time, (ii) the
         rules and regulations promulgated by the SEC under the 1940 Act, as
         amended from time to time, or (iii) an exemption or other relief from
         the provisions of the 1940 Act;

      2. Pledge, mortgage or hypothecate its portfolio securities to the extent
         that at any time the percentage of pledged securities plus the sales
         load will exceed 10% of the offering price of the Fund's shares.
         Notwithstanding the foregoing, the Fund

                                      B-14
<PAGE>   32

         may engage in transactions in options, futures contracts and related
         options, segregate or deposit assets to cover or secure options
         written, and make margin deposits or payments for futures contracts and
         related options;

      3. Engage in the underwriting of securities of other issuers, except that
         the Fund may sell an investment position even though it may be deemed
         to be an underwriter as that term is defined under the 1933 Act;

      4. Acquire any private placement if it would cause more than 2% of the net
         assets of the Fund, as determined at the time the Fund agrees to any
         such acquisition, to be invested in private placements and other assets
         not having readily available market quotations, except that the Fund
         may purchase securities of other investment companies to the extent
         permitted by (i) the 1940 Act, as amended from time to time, (ii) the
         rules and regulations promulgated by the SEC under the 1940 Act, as
         amended from time to time, or (iii) an exemption or other relief from
         the provisions of the 1940 Act;

      5. Purchase or retain securities of a company which has an officer or
         director who is an officer or director of the Fund or its Adviser if,
         to the knowledge of the Fund, one or more such persons own beneficially
         more than 1/2 of 1% of the shares of the company, and all such persons
         own more than 5% thereof;

      6. Invest more than 5% of its net assets in warrants or rights valued at
         the lower of cost or market, nor more than 2% of its net assets in
         warrants or rights (valued on such basis) which are not listed on the
         New York Stock Exchange or American Stock Exchange. Warrants or rights
         acquired in units or attached to other securities are not subject to
         the foregoing limitations;

      7. Invest more than 10% of its net assets (determined at the time of
         investment) in illiquid securities and repurchase agreements that have
         a maturity of longer than seven days; or

      8. Invest in interests in oil, gas, or other mineral exploration or
         developmental programs.

                             TRUSTEES AND OFFICERS

     The business and affairs of the Fund are managed under the direction of the
Fund's Board of Trustees and the Fund's officers appointed by the Board of
Trustees. The tables below list the trustees and officers of the Fund and
executive officers of the Fund's investment adviser and their principal
occupations for the last five years and their affiliations, if any, with Van
Kampen Investments Inc. ("Van Kampen Investments"), Van Kampen Investment
Advisory Corp. ("Advisory Corp."), Van Kampen Asset Management Inc. ("Asset
Management"), Van Kampen Funds Inc. (the "Distributor"), Van Kampen Management
Inc., Van Kampen Advisors Inc., Van Kampen Insurance Agency of Illinois Inc.,
Van Kampen Insurance Agency of Texas Inc., Van Kampen System Inc., Van Kampen
Recordkeeping Services Inc., American Capital Contractual Services, Inc., Van
Kampen Trust Company, Van Kampen Exchange Corp. and Van Kampen Investor Services
Inc. ("Investor Services"). Advisory Corp. and Asset Management sometimes are
referred to herein collectively as the "Advisers". For purposes

                                      B-15
<PAGE>   33

hereof, the term "Fund Complex" includes each of the open-end investment
companies advised by the Advisers (excluding Van Kampen Exchange Fund).

                                    TRUSTEES


<TABLE>
<CAPTION>
                                                       PRINCIPAL OCCUPATIONS OR
          NAME, ADDRESS AND AGE                       EMPLOYMENT IN PAST 5 YEARS
          ---------------------                       --------------------------
<S>                                         <C>
J. Miles Branagan.........................  Private investor. Trustee/Director of each of
1632 Morning Mountain Road                  the funds in the Fund Complex. Co-founder, and
Raleigh, NC 27614                           prior to August 1996, Chairman, Chief Executive
Date of Birth: 07/14/32                     Officer and President, MDT Corporation (now
Age: 68                                     known as Getinge/Castle, Inc., a subsidiary of
                                            Getinge Industrier AB), a company which
                                            develops, manufactures, markets and services
                                            medical and scientific equipment.
Jerry D. Choate...........................  Director of Amgen Inc., a biotechnological
53 Monarch Bay Drive                        company. Trustee/Director of each of the funds
Dana Point, CA 92629                        in the Fund Complex. Prior to January 1999,
Date of Birth: 09/16/38                     Chairman and Chief Executive Officer of The
Age: 61                                     Allstate Corporation ("Allstate") and Allstate
                                            Insurance Company. Prior to January 1995,
                                            President and Chief Executive Officer of
                                            Allstate. Prior to August 1994, various
                                            management positions at Allstate.
Linda Hutton Heagy........................  Managing Partner of Heidrick & Stuggles, an
Sears Tower                                 executive search firm. Trustee/Director of each
233 South Wacker Drive                      of the funds in the Fund Complex. Prior to
Suite 7000                                  1997, Partner, Ray & Berndtson, Inc., an
Chicago, IL 60606                           executive recruiting and management consulting
Date of Birth: 06/03/48                     firm. Formerly, Executive Vice President of ABN
Age: 52                                     AMRO, N.A., a Dutch bank holding company. Prior
                                            to 1992, Executive Vice President of La Salle
                                            National Bank. Trustee on the University of
                                            Chicago Hospitals Board, Vice Chair of the
                                            Board of The YMCA of Metropolitan Chicago and a
                                            member of the Women's Board of the University
                                            of Chicago. Prior to 1996, Trustee of The
                                            International House Board, a fellowship and
                                            housing organization for international graduate
                                            students.
R. Craig Kennedy..........................  President and Director, German Marshall Fund of
11 DuPont Circle, N.W.                      the United States, an independent U.S.
Washington, D.C. 20016                      foundation created to deepen understanding,
Date of Birth: 02/29/52                     promote collaboration and stimulate exchanges
Age: 48                                     of practical experience between Americans and
                                            Europeans. Trustee/Director of each of the
                                            funds in the Fund Complex. Formerly, advisor to
                                            the Dennis Trading Group Inc., a managed
                                            futures and option company that invests money
                                            for individuals and institutions. Prior to
                                            1992, President and Chief Executive Officer,
                                            Director and Member of the Investment Committee
                                            of the Joyce Foundation, a private foundation.
</TABLE>


                                      B-16
<PAGE>   34


<TABLE>
<CAPTION>
                                                       PRINCIPAL OCCUPATIONS OR
          NAME, ADDRESS AND AGE                       EMPLOYMENT IN PAST 5 YEARS
          ---------------------                       --------------------------
<S>                                         <C>
Mitchell M. Merin*........................  President and Chief Operating Officer of Asset
Two World Trade Center                      Management of Morgan Stanley Dean Witter since
66th Floor                                  December 1998. President and Director since
New York, NY 10048                          April 1997 and Chief Executive Officer since
Date of Birth: 08/13/53                     June 1998 of Morgan Stanley Dean Witter
Age: 47                                     Advisors Inc. and Morgan Stanley Dean Witter
                                            Services Company Inc. Chairman, Chief Executive
                                            Officer and Director of Morgan Stanley Dean
                                            Witter Distributors Inc. since June 1998.
                                            Chairman and Chief Executive Officer since June
                                            1998, and Director since January 1998, of
                                            Morgan Stanley Dean Witter Trust FSB. Director
                                            of various Morgan Stanley Dean Witter
                                            subsidiaries. President of the Morgan Stanley
                                            Dean Witter Funds and Discover Brokerage Index
                                            Series since May 1999. Trustee/Director of each
                                            of the funds in the Fund Complex. Previously
                                            Chief Strategic Officer of Morgan Stanley Dean
                                            Witter Advisors Inc. and Morgan Stanley Dean
                                            Witter Services Company Inc. and Executive Vice
                                            President of Morgan Stanley Dean Witter
                                            Distributors Inc. April 1997-June 1998, Vice
                                            President of the Morgan Stanley Dean Witter
                                            Funds and Discover Brokerage Index Series May
                                            1997-April 1999, and Executive Vice President
                                            of Dean Witter, Discover & Co.
Jack E. Nelson............................  President and owner, Nelson Investment Planning
423 Country Club Drive                      Services, Inc., a financial planning company
Winter Park, FL 32789                       and registered investment adviser in the State
Date of Birth: 02/13/36                     of Florida. President and owner, Nelson Ivest
Age: 64                                     Brokerage Services Inc., a member of the
                                            National Association of Securities Dealers,
                                            Inc. and Securities Investors Protection Corp.
                                            Trustee/Director of each of the funds in the
                                            Fund Complex.
Richard F. Powers, III*...................  Chairman, President and Chief Executive Officer
1 Parkview Plaza                            of Van Kampen Investments. Chairman, Director
P.O. Box 5555                               and Chief Executive Officer of the Advisers,
Oakbrook Terrace, IL 60181-5555             the Distributor, Van Kampen Advisors Inc. and
Date of Birth: 02/02/46                     Van Kampen Management Inc. Director and officer
Age: 54                                     of certain other subsidiaries of Van Kampen
                                            Investments. Trustee/Director and President of
                                            each of the funds in the Fund Complex. Trustee,
                                            President and Chairman of the Board of other
                                            investment companies advised by the Advisers
                                            and their affiliates, and Chief Executive
                                            Officer of Van Kampen Exchange Fund. Prior to
                                            May 1998, Executive Vice President and Director
                                            of Marketing at Morgan Stanley Dean Witter and
                                            Director of Dean Witter Discover & Co. and Dean
                                            Witter Realty. Prior to 1996, Director of Dean
                                            Witter Reynolds Inc.
</TABLE>


                                      B-17
<PAGE>   35


<TABLE>
<CAPTION>
                                                       PRINCIPAL OCCUPATIONS OR
          NAME, ADDRESS AND AGE                       EMPLOYMENT IN PAST 5 YEARS
          ---------------------                       --------------------------
<S>                                         <C>
Phillip B. Rooney.........................  Vice Chairman (since April 1997) and Director
One ServiceMaster Way                       (since 1994) of The ServiceMaster Company, a
Downers Grove, IL 60515                     business and consumer services company.
Date of Birth: 07/08/44                     Director of Illinois Tool Works, Inc., a
Age: 56                                     manufacturing company and the Urban Shopping
                                            Centers Inc., a retail mall management company.
                                            Trustee, University of Notre Dame. Trustee/
                                            Director of each of the funds in the Fund
                                            Complex. Prior to 1998, Director of Stone
                                            Smurfit Container Corp., a paper manufacturing
                                            company. From May 1996 through February 1997 he
                                            was President, Chief Executive Officer and
                                            Chief Operating Officer of Waste Management,
                                            Inc., an environmental services company, and
                                            from November 1984 through May 1996 he was
                                            President and Chief Operating Officer of Waste
                                            Management, Inc.

Fernando Sisto............................  Professor Emeritus. Prior to August 1996, a
155 Hickory Lane                            George M. Bond Chaired Professor with Stevens
Closter, NJ 07624                           Institute of Technology, and prior to 1995,
Date of Birth: 08/02/24                     Dean of the Graduate School, Stevens Institute
Age: 76                                     of Technology. Director, Dynalysis of
                                            Princeton, a firm engaged in engineering
                                            research. Trustee/Director of each of the funds
                                            in the Fund Complex.

Wayne W. Whalen*..........................  Partner in the law firm of Skadden, Arps,
333 West Wacker Drive                       Slate, Meagher & Flom (Illinois), legal counsel
Chicago, IL 60606                           to the funds in the Fund Complex, and other
Date of Birth: 08/22/39                     investment companies advised by the Advisers or
Age: 61                                     Van Kampen Management Inc. Trustee/Director of
                                            each of the funds in the Fund Complex, and
                                            Trustee/Managing General Partner of other
                                            investment companies advised by the Advisers or
                                            Van Kampen Management Inc.

Suzanne H. Woolsey........................  Chief Operating Officer of the National Academy
2101 Constitution Ave., N.W.                of Sciences/National Research Council, an
Room 206                                    independent, federally chartered policy
Washington, D.C. 20418                      institution, since 1993. Director of Neurogen
Date of Birth: 12/27/41                     Corporation, a pharmaceutical company, since
Age: 58                                     January 1998. Director of the German Marshall
                                            Fund of the United States, Trustee of Colorado
                                            College, and Vice Chair of the Board of the
                                            Council for Excellence in Government.
                                            Trustee/Director of each of the funds in the
                                            Fund Complex. Prior to 1993, Executive Director
                                            of the Commission on Behavioral and Social
                                            Sciences and Education at the National Academy
                                            of Sciences/National Research Council. From
                                            1980 through 1989, Partner of Coopers &
                                            Lybrand.
</TABLE>


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

* Such trustee is an "interested person" (within the meaning of Section 2(a)(19)
  of the 1940 Act). Mr. Whalen is an interested person of the Fund by reason of
  his firm currently acting as legal counsel to the Fund. Messrs. Merin and
  Powers are interested persons of the Fund and the Advisers by reason of their
  positions with Morgan Stanley Dean Witter or its affiliates.

                                      B-18
<PAGE>   36

                                    OFFICERS


     Messrs. Smith, Santo, Ciccarone, Reynoldson, Sullivan and Zimmermann are
located at 1 Parkview Plaza, Oakbrook Terrace, IL 60181-5555. Mr. Boyd is
located at 2800 Post Oak Blvd., Houston, TX 77056.



<TABLE>
<CAPTION>
      NAME, AGE, POSITIONS AND                        PRINCIPAL OCCUPATIONS
          OFFICES WITH FUND                            DURING PAST 5 YEARS
      ------------------------                        ---------------------
<S>                                    <C>

A. Thomas Smith III..................  Executive Vice President, General Counsel,
  Date of Birth: 12/14/56              Secretary and Director of Van Kampen Investments,
  Age: 43                              the Advisers, Van Kampen Advisors Inc., Van Kampen
  Vice President and Secretary         Management Inc., the Distributor, American Capital
                                       Contractual Services, Inc., Van Kampen Exchange
                                       Corp., Van Kampen Recordkeeping Services Inc.,
                                       Investor Services, Van Kampen Insurance Agency of
                                       Illinois Inc. and Van Kampen System Inc. Vice
                                       President and Secretary/Vice President, Principal
                                       Legal Officer and Secretary of other investment
                                       companies advised by the Advisers or their
                                       affiliates. Vice President and Secretary of each of
                                       the funds in the Fund Complex. Prior to January
                                       1999, Vice President and Associate General Counsel
                                       to New York Life Insurance Company ("New York
                                       Life"), and prior to March 1997, Associate General
                                       Counsel of New York Life. Prior to December 1993,
                                       Assistant General Counsel of The Dreyfus
                                       Corporation. Prior to August 1991, Senior
                                       Associate, Willkie Farr & Gallagher. Prior to
                                       January 1989, Staff Attorney at the Securities and
                                       Exchange Commission, Division of Investment
                                       Management, Office of Chief Counsel.

Michael H. Santo.....................  Executive Vice President, Chief Administrative
  Date of Birth: 10/22/55              Officer and Director of Van Kampen Investments, the
  Age: 44                              Advisers, the Distributor, Van Kampen Advisors
  Vice President                       Inc., Van Kampen Management Inc. and Van Kampen
                                       Investor Services Inc., and serves as a Director or
                                       Officer of certain other subsidiaries of Van Kampen
                                       Investments. Vice President of each of the funds in
                                       the Fund Complex and certain other investment
                                       companies advised by the Advisers and their
                                       affiliates. Prior to 1998, Senior Vice President
                                       and Senior Planning Officer for Individual Asset
                                       Management of Morgan Stanley Dean Witter and its
                                       predecessor since 1994. From 1990-1994, First Vice
                                       President and Assistant Controller in Dean Witter's
                                       Controller's Department.
</TABLE>


                                      B-19
<PAGE>   37


<TABLE>
<CAPTION>
      NAME, AGE, POSITIONS AND                        PRINCIPAL OCCUPATIONS
          OFFICES WITH FUND                            DURING PAST 5 YEARS
      ------------------------                        ---------------------
<S>                                    <C>
Stephen L. Boyd......................  Executive Vice President and Chief Investment
  Date of Birth: 11/16/40              Officer of Van Kampen Investments, and President
  Age: 59                              and Chief Operating Officer of the Advisers.
  Executive Vice President and         Executive Vice President and Chief Investment
  Chief Investment Officer             Officer of each of the funds in the Fund Complex
                                       and certain other investment companies advised by
                                       the Advisers or their affiliates. Prior to April
                                       2000, Vice President and Chief Investment Officer
                                       of the Advisers. Prior to October 1998, Vice
                                       President and Senior Portfolio Manager with AIM
                                       Capital Management, Inc. Prior to February 1998,
                                       Senior Vice President and Portfolio Manager of Van
                                       Kampen American Capital Asset Management, Inc., Van
                                       Kampen American Capital Investment Advisory Corp.
                                       and Van Kampen American Capital Management, Inc.

Richard A. Ciccarone.................  Senior Vice President and Co-head of the Fixed
  Date of Birth: 06/15/52              Income Department of the Advisers, Van Kampen
  Age: 48                              Management Inc. and Van Kampen Advisors Inc. Prior
  Vice President                       to May 2000, he served as Co-head of Municipal
                                       Investments and Director of Research of the
                                       Advisers, Van Kampen Management Inc. and Van Kampen
                                       Advisors Inc. Mr. Ciccarone first joined the
                                       Adviser in June 1983, and worked for the Adviser
                                       until May 1989, with his last position being a Vice
                                       President. From June 1989 to April 1996, he worked
                                       at EVEREN Securities (formerly known as Kemper
                                       Securities), with his last position at EVEREN being
                                       an Executive Vice President. Since April 1996, Mr.
                                       Ciccarone has been a Senior Vice President of the
                                       Advisers, Van Kampen Management Inc. and Van Kampen
                                       Advisors Inc.

John R. Reynoldson...................  Senior Vice President and Co-head of the Fixed
  Birth Date: 05/15/53                 Income Department of the Advisers, Van Kampen
  Age: 47                              Management Inc. and Van Kampen Advisors Inc. Prior
  Vice President                       to May 2000, he managed the investment grade
                                       taxable group for the Adviser since July 1999. From
                                       July 1988 to June 1999, he managed the government
                                       securities bond group for Asset Management. Mr.
                                       Reynoldson has been with Asset Management since
                                       April 1987, and has been a Senior Vice President of
                                       Asset Management since July 1988. He has been a
                                       Senior Vice President of the Adviser and Van Kampen
                                       Management Inc. since June 1995 and Senior Vice
                                       President of Van Kampen Advisors Inc. since June
                                       2000.

John L. Sullivan.....................  Senior Vice President of Van Kampen Investments and
  Date of Birth: 08/20/55              the Advisers. Vice President, Chief Financial
  Age: 44                              Officer and Treasurer of each of the funds in the
  Vice President, Chief Financial      Fund Complex and certain other investment companies
  Officer and Treasurer                advised by the Advisers or their affiliates.
</TABLE>


                                      B-20
<PAGE>   38

<TABLE>
<CAPTION>
      NAME, AGE, POSITIONS AND                        PRINCIPAL OCCUPATIONS
          OFFICES WITH FUND                            DURING PAST 5 YEARS
      ------------------------                        ---------------------
<S>                                    <C>
John. H. Zimmermann, III.............  Senior Vice President and Director of Van Kampen
  Date of Birth: 11/25/57              Investments, President and Director of the
  Age: 42                              Distributor and President of Van Kampen Insurance
  Vice President                       Agency of Illinois Inc. Vice President of each of
                                       the funds in the Fund Complex. From November 1992
                                       to December 1997, Senior Vice President of the
                                       Distributor.
</TABLE>

     Each trustee/director holds the same position with each of the funds in the
Fund Complex. As of the date of this Statement of Additional Information, there
are 63 operating funds in the Fund Complex. Each trustee/director who is not an
affiliated person of Van Kampen Investments, the Advisers or the Distributor
(each a "Non-Affiliated Trustee") is compensated by an annual retainer and
meeting fees for services to the funds in the Fund Complex. Each fund in the
Fund Complex provides a deferred compensation plan to its Non-Affiliated
Trustees that allows trustees/directors to defer receipt of their compensation
and earn a return on such deferred amounts. Deferring compensation has the
economic effect as if the Non-Affiliated Trustee reinvested his or her
compensation into the funds. Each fund in the Fund Complex provides a retirement
plan to its Non-Affiliated Trustees that provides Non-Affiliated Trustees with
compensation after retirement, provided that certain eligibility requirements
are met as more fully described below.

     The compensation of each Non-Affiliated Trustee includes an annual retainer
in an amount equal to $50,000 per calendar year, due in four quarterly
installments on the first business day of each quarter. Payment of the annual
retainer is allocated among the funds in the Fund Complex on the basis of the
relative net assets of each fund as of the last business day of the preceding
calendar quarter. The compensation of each Non-Affiliated Trustee includes a per
meeting fee from each fund in the Fund Complex in the amount of $200 per
quarterly or special meeting attended by the Non-Affiliated Trustee, due on the
date of the meeting, plus reasonable expenses incurred by the Non-Affiliated
Trustee in connection with his or her services as a trustee, provided that no
compensation will be paid in connection with certain telephonic special
meetings.

     Under the deferred compensation plan, each Non-Affiliated Trustee generally
can elect to defer receipt of all or a portion of the compensation earned by
such Non-Affiliated Trustee until retirement. Amounts deferred are retained by
the Fund and earn a rate of return determined by reference to the return on the
common shares of such Fund or other funds in the Fund Complex as selected by the
respective Non-Affiliated Trustee, with the same economic effect as if such
Non-Affiliated Trustee had invested in one or more funds in the Fund Complex. To
the extent permitted by the 1940 Act, the Fund may invest in securities of those
funds selected by the Non-Affiliated Trustees in order to match the deferred
compensation obligation. The deferred compensation plan is not funded and
obligations thereunder represent general unsecured claims against the general
assets of the Fund.

     Under the retirement plan, a Non-Affiliated Trustee who is receiving
compensation from such Fund prior to such Non-Affiliated Trustee's retirement,
has at least 10 years of service (including years of service prior to adoption
of the retirement plan) and retires at or after attaining the age of 60, is
eligible to receive a retirement benefit equal to $2,500 per year for each of
the ten years following such retirement from such Fund. Non-
                                      B-21
<PAGE>   39

Affiliated Trustees retiring prior to the age of 60 or with fewer than 10 years
but more than 5 years of service may receive reduced retirement benefits from
such Fund. Each trustee/director has served as a member of the Board of Trustees
of the Fund since he or she was first appointed or elected in the year set forth
below. The retirement plan contains a Fund Complex retirement benefit cap of
$60,000 per year.

     Additional information regarding compensation and benefits for trustees is
set forth below for the periods described in the notes accompanying the table.

                               COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                                     Fund Complex
                                                      -------------------------------------------
                                                                      Aggregate
                                                       Aggregate      Estimated
                                                      Pension or       Maximum          Total
                                        Aggregate     Retirement       Annual       Compensation
                        Year First    Compensation     Benefits     Benefits from      before
                       Appointed or      before       Accrued as      the Fund      Deferral from
                        Elected to    Deferral from     Part of         Upon            Fund
       Name(1)          the Board      the Fund(2)    Expenses(3)   Retirement(4)    Complex(5)
       -------         ------------   -------------   -----------   -------------   -------------
<S>                    <C>            <C>             <C>           <C>             <C>
J. Miles Branagan          1991          $ 5,373        $40,303        $60,000        $126,000
Jerry D. Choate(1)         1999            3,902              0         60,000          88,700
Linda Hutton Heagy         1995            5,373          5,045         60,000         126,000
R. Craig Kennedy           1995            5,373          3,571         60,000         125,600
Jack E. Nelson             1995            5,373         21,664         60,000         126,000
Phillip B. Rooney          1997            5,173          7,787         60,000         113,400
Fernando Sisto             1980            5,373         72,060         60,000         126,000
Wayne W. Whalen            1995            5,373         15,189         60,000         126,000
Suzanne H. Woolsey(1)      1999            3,902              0         60,000          88,700
</TABLE>

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

(1) Trustees not eligible for compensation are not included in the Compensation
    Table. Mr. Choate and Ms. Woolsey became members of the Board of Trustees
    for the Fund and other funds in the Fund Complex on May 26, 1999 and
    therefore do not have a full year of information to report.

(2) The amounts shown in this column represent the Aggregate Compensation before
    Deferral with respect to the Fund's fiscal year ended December 31, 1999. The
    following trustees deferred compensation from the Fund during the fiscal
    year ended December 31, 1999: Mr. Branagan, $5,373; Mr. Choate, $2,652; Ms.
    Heagy, $5,373; Mr. Kennedy, $2,687; Mr. Nelson, $5,373; Mr. Rooney, $5,173;
    Mr. Sisto, $2,687; and Mr. Whalen, $5,373. Amounts deferred are retained by
    the Fund and earn a rate of return determined by reference to either the
    return on the common shares of the Fund or other funds in the Fund Complex
    as selected by the respective Non-Affiliated Trustee, with the same economic
    effect as if such Non-Affiliated Trustee had invested in one or more funds
    in the Fund Complex. To the extent permitted by the 1940 Act, each fund may
    invest in securities of those funds selected by the Non-Affiliated Trustees
    in order to match the deferred compensation obligation. The cumulative
    deferred compensation (including interest) accrued with respect to each
    trustee, including former trustees, from the Fund as of December 31, 1999 is
    as follows: Mr. Branagan, $20,339; Mr. Caruso, $7,499; Mr. Choate, $3,611;
    Mr. Gaughan, $589;

                                      B-22
<PAGE>   40

    Ms. Heagy, $20,392; Mr. Kennedy, $16,012; Mr. Miller, $5,361; Mr. Nelson,
    $37,429; Mr. Rees, $3,222; Mr. Robinson, $12,649; Mr. Rooney, $21,158; Mr.
    Sisto, $59,370; Mr. Whalen, $25,603; and Mr. Yovovich, $6,392. The deferred
    compensation plan is described above the Compensation Table.

(3) The amounts shown in this column represent the sum of the retirement
    benefits accrued by the operating investment companies in the Fund Complex
    for each of the trustees for the funds' respective fiscal years ended in
    1999. The retirement plan is described above the Compensation Table.

(4) For each trustee, this is the sum of the estimated maximum annual benefits
    payable by the funds in the Fund Complex for each year of the 10-year period
    commencing in the year of such trustee's anticipated retirement. The
    retirement plan is described above the Compensation Table.

(5) The amounts shown in this column represent the aggregate compensation paid
    by all of the funds in the Fund Complex as of December 31, 1999 before
    deferral by the trustees under the deferred compensation plan. Because the
    funds in the Fund Complex have different fiscal year ends, the amounts shown
    in this column are presented on a calendar year basis. Certain trustees
    deferred all or a portion of their aggregate compensation from the Fund
    Complex during the calendar year ended December 31, 1999. The deferred
    compensation earns a rate of return determined by reference to the return on
    the shares of the funds in the Fund Complex as selected by the respective
    Non-Affiliated Trustee, with the same economic effect as if such Non-
    Affiliated Trustee had invested in one or more funds in the Fund Complex. To
    the extent permitted by the 1940 Act, the Fund may invest in securities of
    those investment companies selected by the Non-Affiliated Trustees in order
    to match the deferred compensation obligation. The Advisers and their
    affiliates also serve as investment adviser for other investment companies;
    however, with the exception of Mr. Whalen, the Non-Affiliated Trustees were
    not trustees of such investment companies. Combining the Fund Complex with
    other investment companies advised by the Advisers and their affiliates, Mr.
    Whalen received Total Compensation of $279,250 during the calendar year
    ended December 31, 1999.

     The Fund, the Adviser and the Distributor have adopted Codes of Ethics
(collectively, the "Code of Ethics") that set forth general and specific
standards relating to the securities trading activities of their employees. The
Code of Ethics does not prohibit employees from acquiring securities that may be
purchased or held by the Fund, but is intended to ensure that all employees
conduct their personal transactions in a manner that does not interfere with the
portfolio transactions of the Fund or other Van Kampen funds, or that such
employees take unfair advantage of their relationship with the Fund. Among other
things, the Code of Ethics prohibits certain types of transactions absent prior
approval, imposes various trading restrictions (such as time periods during
which personal transactions may or may not be made) and requires quarterly
reporting of securities transactions and other matters. All reportable
securities transactions and other required reports are to be reviewed by
appropriate personnel for compliance with the Code of Ethics. Additional
restrictions apply to portfolio managers, traders, research analysts and others
who may have access to nonpublic information about the trading activities of the
Fund or other Van Kampen funds or who otherwise are involved in the investment
advisory process. Exceptions to these and other provisions of the Code of Ethics
may be granted in particular circumstances after review by appropriate
personnel.

                                      B-23
<PAGE>   41


     As of September   , 2000, the trustees and officers of the Fund as a group
owned less than 1% of the shares of the Fund.


                         INVESTMENT ADVISORY AGREEMENT

     The Fund and the Adviser are parties to an investment advisory agreement
(the "Advisory Agreement"). Under the Advisory Agreement, the Fund retains the
Adviser to manage the investment of the Fund's assets, including the placing of
orders for the purchase and sale of portfolio securities. The Adviser obtains
and evaluates economic, statistical and financial information to formulate
strategy and implement the Fund's investment objective. The Adviser also
furnishes offices, necessary facilities and equipment, provides administrative
services to the Fund, renders periodic reports to the Board of Trustees and
permits its officers and employees to serve without compensation as trustees of
the Trust or officers of the Fund if elected to such positions. The Fund,
however, bears the cost of its day-to-day operations, including the compensation
of trustees of the Trust (other than those who are affiliated persons of the
Adviser, Distributor or Van Kampen Investments), the charges are expenses of
legal counsel and independent accountants, distribution fees, service fees,
custodian fees, the cost of providing reports to shareholders, and all other
ordinary business expenses not specifically assumed by the Adviser. The Advisory
Agreement also provides that the Adviser shall not be liable to the Fund for any
actions or omissions in the absence of willful misfeasance, bad faith,
negligence or reckless disregard of its obligations and duties under the
Advisory Agreement.

     The fee payable to the Adviser is reduced by any commissions, tender
solicitation and other fees, brokerage or similar payments received by the
Adviser or any other direct or indirect majority owned subsidiary of Van Kampen
Investments in connection with the purchase and sale of portfolio investments
less any direct expenses incurred by such subsidiary of Van Kampen Investments,
in connection with obtaining such commissions, fees, brokerage or similar
payments. The Adviser agrees to use its best efforts to recapture tender
solicitation fees and exchange offer fees for the Fund's benefit and to advise
the Trustees of the Fund of any other commissions, fees, brokerage or similar
payments which may be possible for the Adviser or any other direct or indirect
majority owned subsidiary of Van Kampen Investments to receive in connection
with the Fund's portfolio transactions or other arrangements which may benefit
the Fund.

     The Advisory Agreement also provides that, in the event the ordinary
business expenses of the Fund for any fiscal year exceed 1.5% of the first $30
million of the Fund's average daily net assets plus 1% of any excess over $30
million, the compensation due the Adviser will be reduced by the amount of such
excess and that, if a reduction in and refund of the advisory fee is
insufficient, the Adviser will pay the Fund monthly an amount sufficient to make
up the deficiency, subject to readjustment during the year. Ordinary business
expenses include the investment advisory fee and other operating costs paid by
the Fund except (1) interest and taxes, (2) brokerage commissions, (3) certain
litigation and indemnification expenses as described in the Advisory Agreement
and (4) payments made by the Fund pursuant to the distribution plans.

     The Advisory Agreement may be continued from year to year if specifically
approved at least annually (a)(i) by the Fund's Trustees or (ii) by a vote of a
majority of the Fund's outstanding voting securities and (b) by the affirmative
vote of a majority of the

                                      B-24
<PAGE>   42

Trustees who are not parties to the agreement or interested persons of any such
party by votes cast in person at a meeting called for such purpose. The Advisory
Agreement provides that it shall terminate automatically if assigned and that it
may be terminated without penalty by either party on 60 days' written notice.

     During the fiscal years ended December 31, 1999, 1998 and 1997, the Adviser
received approximately $14,030,000, $11,985,200 and $9,423,400, respectively, in
advisory fees from the Fund.

                                OTHER AGREEMENTS

     Accounting Services Agreement. The Fund has entered into an accounting
services agreement pursuant to which Advisory Corp. provides accounting services
supplementary to those provided by the custodian. Such services are expected to
enable the Fund to more closely monitor and maintain its accounts and records.
The Fund pays all costs and expenses related to such services, including all
salary and related benefits of accounting personnel, as well as the overhead and
expenses of office space and the equipment necessary to render such services.
The Fund shares together with the other Van Kampen funds in the cost of
providing such services with 25% of such costs shared proportionately based on
the respective number of classes of securities issued per fund and the remaining
75% of such costs based proportionately on their respective net assets per fund.

     During the fiscal years ended December 31, 1999, 1998 and 1997, Advisory
Corp. received approximately $640,300, $594,200 and $269,000, respectively, in
accounting services fees from the Fund.

                            DISTRIBUTION AND SERVICE

     The Distributor acts as the principal underwriter of the Fund's shares
pursuant to a written agreement (the "Distribution and Service Agreement"). The
Distributor has the exclusive right to distribute shares of the Fund through
authorized dealers on a continuous basis. The Distributor's obligation is an
agency or "best efforts" arrangement under which the Distributor is required to
take and pay for only such shares of the Fund as may be sold to the public. The
Distributor is not obligated to sell any stated number of shares. The
Distributor bears the cost of printing (but not typesetting) prospectuses used
in connection with this offering and certain other costs including the cost of
supplemental sales literature and advertising. The Distribution and Service
Agreement is renewable from year to year if approved (a)(i) by the Fund's
Trustees or (ii) by a vote of a majority of the Fund's outstanding voting
securities and (b) by the affirmative vote of a majority of Trustees who are not
parties to the Distribution and Service Agreement or interested persons of any
party, by votes cast in person at a meeting called for such purpose. The
Distribution and Service Agreement provides that it will terminate if assigned,
and that it may be terminated without penalty by either party on 90 days'
written notice. Total underwriting

                                      B-25
<PAGE>   43

commissions on the sale of shares of the Fund for the last three fiscal periods
are shown in the chart below.

<TABLE>
<CAPTION>
                                                                 Total            Amounts
                                                              Underwriting      Retained by
                                                              Commissions       Distributor
                                                              ------------      -----------
<S>                                                           <C>               <C>
Fiscal year ended December 31, 1999.....................       $7,195,313        $914,283
Fiscal year ended December 31, 1998.....................       $6,296,136        $859,326
Fiscal year ended December 31, 1997.....................       $4,997,467        $678,682
</TABLE>

     With respect to sales of Class A Shares of the Fund, the total sales
charges and concessions reallowed to authorized dealers at the time of purchase
are as follows:

                       CLASS A SHARES SALES CHARGE TABLE

<TABLE>
<CAPTION>
                                                     Total Sales Charge
                                                  -------------------------         Reallowed
                                                  As % of       As % of Net        To Dealers
                  Size of                         Offering        Amount            As a % of
                 Investment                        Price         Invested        Offering Price
------------------------------------------------------------------------------------------------
<S>                                               <C>           <C>              <C>
Less than $50,000...........................       5.75%           6.10%              5.00%
$50,000 but less than $100,000..............       4.75%           4.99%              4.00%
$100,000 but less than $250,000.............       3.75%           3.90%              3.00%
$250,000 but less than $500,000.............       2.75%           2.83%              2.25%
$500,000 but less than $1,000,000...........       2.00%           2.04%              1.75%
$1,000,000 or more..........................           *               *                  *
------------------------------------------------------------------------------------------------
</TABLE>

* No sales charge is payable at the time of purchase on investments of $1
  million or more, although the Fund may impose a contingent deferred sales
  charge of 1.00% on certain redemptions made within one year of the purchase. A
  commission or transaction fee will be paid by the Distributor at the time of
  purchase directly out of the Distributor's assets (and not out of the Fund's
  assets) to authorized dealers who initiate and are responsible for purchases
  of $1 million or more computed on a percentage of the dollar value of such
  shares sold as follows: 1.00% on sales to $2 million, plus 0.80% on the next
  $1 million and 0.50% on the excess over $3 million. For single purchases of
  $20 million or more by an individual retail investor the Distributor will pay,
  at the time of purchase and directly out of the Distributor's assets (and not
  out of the Fund's assets), a commission or transaction fee of 1.00% to
  authorized dealers who initiate and are responsible for such purchases. The
  commission or transaction fee of 1.00% will be computed on a percentage of the
  dollar value of such shares sold.


     With respect to sales of Class B Shares and Class C Shares of the Fund, a
commission or transaction fee generally will be paid by the Distributor at the
time of purchase directly out of the Distributor's assets (and not out of the
Fund's assets) to authorized dealers who initiate and are responsible for such
purchases computed based on a percentage of the dollar value of such shares sold
of 4.00% on Class B Shares and 1.00% on Class C Shares.


     Proceeds from any contingent deferred sales charge and any distribution
fees on Class B Shares and Class C Shares of the Fund are paid to the
Distributor and are used by the Distributor to defray its distribution related
expenses in connection with the sale of

                                      B-26
<PAGE>   44

the Fund's shares, such as the payment to authorized dealers for selling such
shares. With respect to Class C Shares, the authorized dealers generally are
paid the ongoing commission and transaction fees of up to 0.75% of the average
daily net assets of the Fund's Class C Shares annually commencing in the second
year after purchase.


     With respect to Class D Shares, there are no sales charges paid by
investors and no commissions or transaction fees to authorized dealers.


     In addition to reallowances or commissions described above, the Distributor
may from time to time implement programs under which an authorized dealer's
sales force may be eligible to win nominal awards for certain sales efforts or
under which the Distributor will reallow to any authorized dealer that sponsors
sales contests or recognition programs conforming to criteria established by the
Distributor, or participates in sales programs sponsored by the Distributor, an
amount not exceeding the total applicable sales charges on the sales generated
by the authorized dealer at the public offering price during such programs.
Also, the Distributor in its discretion may from time to time, pursuant to
objective criteria established by the Distributor, pay fees to, and sponsor
business seminars for, qualifying authorized dealers for certain services or
activities which are primarily intended to result in sales of shares of the Fund
or other Van Kampen funds. Fees may include payment for travel expenses,
including lodging, incurred in connection with trips taken by invited registered
representatives for meetings or seminars of a business nature. In some instances
additional compensation or promotional incentives may be offered to brokers,
dealers or financial intermediaries that have sold or may sell significant
amounts of shares during specified periods of time. The Distributor may provide
additional compensation to Edward D. Jones & Co. or an affiliate thereof based
on a combination of its quarterly sales of shares of the Fund and other Van
Kampen funds and increases in net assets of the Fund and other Van Kampen funds
over specified thresholds. All of the foregoing payments are made by the
Distributor out of its own assets. Such fees paid for such services and
activities with respect to the Fund will not exceed in the aggregate 1.25% of
the average total daily net assets of the Fund on an annual basis. These
programs will not change the price an investor will pay for shares or the amount
that a Fund will receive from such sale.


     The Fund has adopted a distribution plan (the "Distribution Plan") with
respect to Class A Shares, Class B Shares and Class C Shares pursuant to Rule
12b-1 under the 1940 Act. The Fund also has adopted a service plan (the "Service
Plan") with respect to Class A Shares, Class B Shares and Class C Shares. There
is no distribution plan or service plan in effect for Class D Shares. The
Distribution Plan and the Service Plan sometimes are referred to herein as the
"Plans". The Plans provide that the Fund may spend a portion of the Fund's
average daily net assets attributable to each such class of shares in connection
with distribution of the respective class of shares and in connection with the
provision of ongoing services to shareholders of such class, respectively. The
Distribution Plan and the Service Plan are being implemented through the
Distribution and Service Agreement with the Distributor of each such class of
the Fund's shares and sub-agreements between the Distributor and members of the
NASD who are acting as securities dealers and NASD members or eligible
non-members who are acting as brokers or agents and similar agreements between
the Fund and financial intermediaries who are acting as brokers (collectively,
"Selling Agreements") that may provide for their customers or clients certain
services or assistance, which may include, but not be limited to, processing
purchase and


                                      B-27
<PAGE>   45

redemption transactions, establishing and maintaining shareholder accounts
regarding the Fund, and such other services as may be agreed to from time to
time and as may be permitted by applicable statute, rule or regulation. Brokers,
dealers and financial intermediaries that have entered into sub-agreements with
the Distributor and sell shares of the Fund are referred to herein as "financial
intermediaries."

     Certain financial intermediaries may be prohibited under law from providing
certain underwriting or distribution services. If a financial intermediary were
prohibited from acting in any capacity or providing any of the described
services, the Distributor would consider what action, if any, would be
appropriate. The Distributor does not believe that termination of a relationship
with a financial intermediary would result in any material adverse consequences
to the Fund.

     The Distributor must submit quarterly reports to the Board of Trustees of
the Trust, of which the Fund is a series, setting forth separately by class of
shares all amounts paid under the Distribution Plan and the purposes for which
such expenditures were made, together with such other information as from time
to time is reasonably requested by the Trustees. The Plans provide that they
will continue in full force and effect from year to year so long as such
continuance is specifically approved by a vote of the Trustees, and also by a
vote of the disinterested Trustees, cast in person at a meeting called for the
purpose of voting on the Plans. Each of the Plans may not be amended to increase
materially the amount to be spent for the services described therein with
respect to any class of shares without approval by a vote of a majority of the
outstanding voting shares of such class, and all material amendments to either
of the Plans must be approved by the Trustees and also by the disinterested
Trustees. Each of the Plans may be terminated with respect to any class of
shares at any time by a vote of a majority of the disinterested Trustees or by a
vote of a majority of the outstanding voting shares of such class.

     For Class A Shares in any given year in which the Plans are in effect, the
Plans generally provide for the Fund to pay the Distributor the lesser of (i)
the amount of the Distributor's actual expenses incurred during such year less
any deferred sales charges (if any) it received during such year (the "actual
net expenses") or (ii) the distribution and service fees at the rates specified
in the Prospectus (the "plan fees"). Therefore, to the extent the Distributor's
actual net expenses in a given year are less than the plan fees for such year,
the Fund only pays the actual net expenses. Alternatively, to the extent the
Distributor's actual net expenses in a given year exceed the plan fees for such
year, the Fund only pays the plan fees for such year. For Class A Shares, there
is no carryover of any unreimbursed actual net expenses to succeeding years.

     The Plans for Class B Shares and Class C Shares are similar to the Plans
for Class A Shares, except that any actual net expenses which exceed plan fees
for a given year are carried forward and are eligible for payment in future
years by the Fund so long as the Plans remain in effect. Thus, for each of the
Class B Shares and Class C Shares, in any given year in which the Plans are in
effect, the Plans generally provide for the Fund to pay the Distributor the
lesser of (i) the applicable amount of the Distributor's actual net expenses
incurred during such year for such class of shares plus any actual net expenses
from prior years that are still unpaid by the Fund for such class of shares or
(ii) the applicable plan fees for such class of shares. Except as may be
mandated by applicable law, the Fund does not impose any limit with respect to
the number of years into the future that such unreimbursed actual net expenses
may be carried forward (on a Fund

                                      B-28
<PAGE>   46

level basis). These unreimbursed actual net expenses may or may not be recovered
through plan fees or contingent deferred sales charges in future years.

     Because of fluctuation in net asset value, the plan fees with respect to a
particular Class B Share or Class C Share may be greater or less than the amount
of the initial commission (including carrying cost) paid by the Distributor with
respect to such share. In such circumstances, a shareholder of a share may be
deemed to incur expenses attributable to other shareholders of such class. As of
December 31, 1999, there were $25,938,033 and $1,180,451 of unreimbursed
distribution-related expenses with respect to Class B Shares and Class C Shares,
respectively, representing 2.54% and 1.00% of the Fund's average daily net
assets attributable to Class B Shares and Class C Shares, respectively. If the
Plans were terminated or not continued, the Fund would not be contractually
obligated to pay the Distributor for any expenses not previously reimbursed by
the Fund or recovered through contingent deferred sales charges.

     For the fiscal year ended December 31, 1999, the Fund's aggregate expenses
paid under the Plans for Class A Shares were $4,797,288 or 0.23% of the Class A
Shares' average daily net assets. Such expenses were paid to reimburse the
Distributor for payments made to financial intermediaries for servicing Class A
shareholders and for administering the Class A Share Plans. For the fiscal year
ended December 31, 1999, the Fund's aggregate expenses paid under the Plans for
Class B Shares were $8,578,348 or 1.00% of the Class B Shares' average daily net
assets. Such expenses were paid to reimburse the Distributor for the following
payments: $6,428,570 for commissions and transaction fees paid to financial
intermediaries in respect of sales of Class B Shares of the Fund and $2,149,778
for fees paid to financial intermediaries for servicing Class B shareholders and
administering the Class B Share Plans. For the fiscal year ended December 31,
1999, the Fund's aggregate expenses paid under the Plans for Class C Shares were
$940,577 or 1.00% of the Class C Shares' average daily net assets. Such expenses
were paid to reimburse the Distributor for the following payments; $385,536 for
commissions and transaction fees paid to financial intermediaries in respect of
sales of Class C Shares of the Fund and $555,041 for fees paid to financial
intermediaries for servicing Class C shareholders and administering the Class C
Share Plans.

     The Distributor has entered into agreements with the following firms: (i)
Fidelity Brokerage Services, Inc. & National Financial Services Corporation,
(ii) GreatWest Life & Annuity Insurance Company/BenefitsCorp Equities, Inc.,
(iii) Hewitt Associates, LLC, (iv) Huntington Bank, (v) Invesco Retirement and
Benefit Services, Inc., (vi) Lincoln National Life Insurance Company, (vii)
Merrill Lynch Pierce, Fenner & Smith, Incorporated, (viii) Dean Witter Reynolds,
Inc., (ix) National Deferred Compensation, Inc., (x) Nationwide Investment
Services Corporation, (xi) Norwest Bank Minnesota, N.A./Wells Fargo Bank, N.A.,
(xii) The Prudential Insurance Company of America, (xiii) Charles Schwab & Co.,
Inc., (xiv) Smith Barney, Inc., and (xv) Union Bank of California, N.A. Shares
of the Fund shall be offered pursuant to such firm's retirement plan alliance
program(s). Trustees and other fiduciaries of retirement plans seeking to invest
in multiple fund families through broker-dealer retirement plan alliance
programs should contact the firms mentioned above for further information
concerning the program(s) including, but not limited to, minimum investment and
operational requirements.

                                      B-29
<PAGE>   47

                                 TRANSFER AGENT

     The Fund's transfer agent, shareholder service agent and dividend
disbursing agent is Van Kampen Investor Services Inc. The transfer agency prices
are determined through negotiations with the Fund's Board of Trustees and are
based on competitive benchmarks.

                PORTFOLIO TRANSACTIONS AND BROKERAGE ALLOCATION

     The Adviser is responsible for decisions to buy and sell securities for the
Fund, the selection of brokers and dealers to effect the transactions and the
negotiation of prices and any brokerage commissions on such transactions. While
the Adviser will be primarily responsible for the placement of the Fund's
portfolio business, the policies and practices in this regard will at all times
be subject to review by the Board of Trustees of the Fund.

     The Adviser is responsible for placing portfolio transactions and does so
in a manner deemed fair and reasonable to the Fund and not according to any
formula. The primary consideration in all portfolio transactions is prompt
execution of orders in an effective manner at the most favorable price. In
selecting broker-dealers and in negotiating prices and any brokerage commissions
on such transactions, the Adviser considers the firm's reliability, integrity
and financial condition and the firm's execution capability, the size and
breadth of the market for the security, the size of and difficulty in executing
the order, and the best net price. There are many instances when, in the
judgment of the Adviser, more than one firm can offer comparable execution
services. In selecting among such firms, consideration may be given to those
firms which supply research and other services in addition to execution
services. The Adviser is authorized to pay higher commissions to brokerage firms
that provide it with investment and research information than to firms which do
not provide such services if the Adviser determines that such commissions are
reasonable in relation to the overall services provided. No specific value can
be assigned to such research services which are furnished without cost to the
Adviser. Since statistical and other research information is only supplementary
to the research efforts of the Adviser to the Fund and still must be analyzed
and reviewed by its staff, the receipt of research information is not expected
to reduce its expenses materially. The investment advisory fee is not reduced as
a result of the Adviser's receipt of such research services. Services provided
may include (a) furnishing advice as to the value of securities, the
advisability of investing in, purchasing or selling securities, and the
availability of securities or purchasers or sellers of securities; (b)
furnishing analyses and reports concerning issuers, industries, securities,
economic factors and trends, portfolio strategy, and the performance of
accounts; and (c) effecting securities transactions and performing functions
incidental thereto (such as clearance, settlement and custody). Research
services furnished by firms through which the Fund effects its securities
transactions may be used by the Adviser in servicing all of its advisory
accounts; not all of such services may be used by the Adviser in connection with
the Fund.

     The Adviser also may place portfolio transactions, to the extent permitted
by law, with brokerage firms affiliated with the Fund, the Adviser or the
Distributor and with brokerage firms participating in the distribution of the
Fund's shares if it reasonably believes that the quality of execution and the
commission are comparable to that available from other qualified firms.
Similarly, to the extent permitted by law and subject to the same considerations
on quality of execution and comparable commission rates, the Adviser may direct
an executing broker to pay a portion or all of any commissions, concessions or

                                      B-30
<PAGE>   48

discounts to a firm supplying research or other services or to a firm
participating in the distribution of the Fund's shares.

     The Adviser may place portfolio transactions at or about the same time for
other advisory accounts, including other investment companies. The Adviser seeks
to allocate portfolio transactions equitably whenever concurrent decisions are
made to purchase or sell securities for the Fund and another advisory account.
In some cases, this procedure could have an adverse effect on the price or the
amount of securities available to the Fund. In making such allocations among the
Fund and other advisory accounts, the main factors considered by the Adviser are
the respective sizes of the Fund and other advisory accounts, the respective
investment objective, the relative size of portfolio holdings of the same or
comparable securities, the availability of cash for investment, the size of
investment commitments generally held and opinions of the persons responsible
for recommending the investment.

     Effective October 31, 1996, Morgan Stanley & Co. Incorporated ("Morgan
Stanley") became an affiliate of the Adviser. Effective May 31, 1997, Dean
Witter Reynolds, Inc. ("Dean Witter") became an affiliate of the Adviser. The
Fund's Board of Trustees have adopted certain policies incorporating the
standards of Rule 17e-1 issued by the SEC under the 1940 Act which require that
the commissions paid to affiliates of the Fund must be reasonable and fair
compared to the commissions, fees or other remuneration received or to be
received by other brokers in connection with comparable transactions involving
similar securities during a comparable period of time. The rule and procedures
also contain review requirements and require the Adviser to furnish reports to
the Trustees and to maintain records in connection with such reviews. After
consideration of all factors deemed relevant, the Trustees will consider from
time to time whether the advisory fee for the Fund will be reduced by all or a
portion of the brokerage commission given to affiliated brokers.

     The Fund paid the following commissions to all brokers and affiliated
brokers during the years shown:

     Commissions Paid:

<TABLE>
<CAPTION>
                                                                       Affiliated Brokers
                                                                       ------------------
                                                            All         Morgan      Dean
                                                          Brokers      Stanley     Witter
                                                          -------      -------     ------
<S>                                                      <C>           <C>         <C>
Fiscal year ended December 31, 1999..................    $7,090,125    $108,880    $   --
Fiscal year ended December 31, 1998..................    $4,420,585    $     --    $   --
Fiscal year ended December 31, 1997..................    $2,707,388    $     --    $   --
Fiscal year 1999 Percentages:
  Commissions with affiliate to total commissions....                     1.54%        --
  Value of brokerage transactions with affiliate to
     total transactions..............................                     0.00%        --
</TABLE>

     During the fiscal year end December 31, 1999, the Fund paid $4,674,777 in
brokerage commissions on transactions totalling $3,989,160,241 to brokers
selected primarily on the basis of research services provided to the Adviser.

                                      B-31
<PAGE>   49

                              SHAREHOLDER SERVICES

     The Fund offers a number of shareholder services designed to facilitate
investment in its shares at little or no extra cost to the investor. Below is a
description of such services. The following information supplements the section
in the Fund's Prospectus captioned "Shareholder Services."

INVESTMENT ACCOUNT

     Each shareholder has an investment account under which the investor's
shares of the Fund are held by Investor Services, the Fund's transfer agent.
Investor Services performs bookkeeping, data processing and administrative
services related to the maintenance of shareholder accounts. Except as described
in the Prospectus and this Statement of Additional Information, after each share
transaction in an account, the shareholder receives a statement showing the
activity in the account. Each shareholder who has an account in any of the
Participating Funds (as defined in the Prospectus) will receive statements
quarterly from Investor Services showing any reinvestments of dividends and
capital gain dividends and any other activity in the account since the preceding
statement. Such shareholders also will receive separate confirmations for each
purchase or sale transaction other than reinvestment of dividends and capital
gain dividends and systematic purchases or redemptions. Additional shares may be
purchased at any time through authorized dealers or by mailing a check and
detailed instructions directly to Investor Services.

SHARE CERTIFICATES

     Generally, the Fund will not issue share certificates. However, upon
written or telephone request to the Fund, a share certificate will be issued
representing shares (with the exception of fractional shares) of the Fund. A
shareholder will be required to surrender such certificates upon an exchange or
redemption of the shares represented by the certificate. In addition, if such
certificates are lost the shareholder must write to Van Kampen Funds Inc., c/o
Investor Services, PO Box 218256, Kansas City, MO 64121-8256, requesting an
"Affidavit of Loss" and obtain a Surety Bond in a form acceptable to Investor
Services. On the date the letter is received, Investor Services will calculate
the fee for replacing the lost certificate equal to no more than 1.50% of the
net asset value of the issued shares, and bill the party to whom the replacement
certificate was mailed.

RETIREMENT PLANS


     Eligible investors may establish individual retirement accounts ("IRAs");
SEP; 401(k) plans; Section 403(b)(7) plans in the case of employees of public
school systems and certain non-profit organizations; or other pension or profit
sharing plans. Documents and forms containing detailed information regarding
these plans are available from the Distributor. Van Kampen Trust Company serves
as custodian under the IRA, 403(b)(7) and Money Purchase and Profit Sharing
Keogh plans.


                                      B-32
<PAGE>   50

AUTOMATED CLEARING HOUSE("ACH") DEPOSITS

     Shareholders can use ACH to have redemption proceeds deposited
electronically into their bank accounts. Redemption proceeds transferred to a
bank account via the ACH plan are available to be credited to the account on the
second business day following normal payment. In order to utilize this option,
the shareholder's bank must be a member of ACH. In addition, the shareholder
must fill out the appropriate section of the account application. The
shareholder must also include a voided check or deposit slip from the bank
account into which redemption proceeds are to be deposited together with the
completed application. Once Investor Services has received the application and
the voided check or deposit slip, such shareholder's designated bank account,
following any redemption, will be credited with the proceeds of such redemption.
Once enrolled in the ACH plan, a shareholder may terminate participation at any
time by writing Investor Services or by calling (800) 341-2911 ((800) 421-2833
for the hearing impaired).

DIVIDEND DIVERSIFICATION

     A shareholder may upon written request, by completing the appropriate
section of the account application or by calling (800) 341-2911 ((800) 421-2833
for the hearing impaired), elect to have all dividends and capital gain
dividends paid on a class of shares of the Fund invested into shares of the same
class of any Participating Fund so long as the investor has a pre-existing
account for such class of shares of the other fund. Both accounts must be of the
same type, either non-retirement or retirement. If the accounts are retirement
accounts, they must both be for the same class and of the same type of
retirement plan (e.g. IRA, 403(b)(7), 401(k), Keogh) and for the benefit of the
same individual. If a qualified, pre-existing account does not exist, the
shareholder must establish a new account subject to minimum investment and other
requirements of the fund into which distributions would be invested.
Distributions are invested into the selected fund at its net asset value per
share as of the payable date of the distribution.

SYSTEMATIC WITHDRAWAL PLAN

     A shareholder may establish a monthly, quarterly, semiannual or annual
withdrawal plan if the shareholder owns shares in a single account valued at
$10,000 or more at the next determined net asset value per share at the time the
plan is established. If the shareholder owns shares in a single account valued
at $5,000 or more at the next determined net asset value per share at the time
the plan is established, the shareholder may establish a quarterly, semiannual
or annual withdrawal plan. This plan provides for the orderly use of the entire
account, not only the income but also the capital, if necessary. Each payment
represents the proceeds of a redemption of shares on which any capital gain or
loss will be recognized. The planholder may arrange for regular checks in any
amount, not less than $25. Such a systematic withdrawal plan may also be
maintained by an investor purchasing shares for a retirement plan established on
a form made available by the Fund. See "Shareholder Services--Retirement Plans."

     Class B Shareholders and Class C Shareholders who establish a systematic
withdrawal plan may redeem up to 12% annually of the shareholder's initial
account balance without incurring a contingent deferred sales charge. Initial
account balance means the amount of the shareholder's investment at the time the
election to participate in the plan is made.

                                      B-33
<PAGE>   51

     Under the plan, sufficient shares of the Fund are redeemed to provide the
amount of the periodic payment. Dividends and capital gain dividends on shares
held in accounts with systematic withdrawal plans are reinvested in additional
shares at the next determined net asset value per share. If periodic withdrawals
continuously exceed reinvested dividends and capital gain dividends, the
shareholder's original investment will be correspondingly reduced and ultimately
exhausted. Redemptions made concurrently with the purchase of additional shares
ordinarily will be disadvantageous to the shareholder because of the duplication
of sales charges. Any gain or loss realized by the shareholder upon redemption
of shares is a taxable event. The Fund reserves the right to amend or terminate
the systematic withdrawal program upon 30 days' notice to its shareholders.

EXCHANGE PRIVILEGE

     All shareholders are limited to eight exchanges per fund during a rolling
365-day period.

     Exchange privileges will be suspended on a particular fund if more than
eight exchanges out of that fund are made during a rolling 365-day period. If
exchange privileges are suspended, subsequent exchange requests during the
period will not be processed. Exchange privileges will be restored when the
account history shows fewer than eight exchanges in the rolling 365-day period.

     This policy does not apply to money market funds, systematic exchange plans
or employee-sponsored retirement plans.

REINSTATEMENT PRIVILEGE


     A Class A Shareholder or Class B Shareholder who has redeemed shares of the
Fund may reinstate any portion or all of the net proceeds of such redemption in
Class A Shares of the Fund. A Class C Shareholder who has redeemed shares of the
Fund may reinstate any portion or all of the net proceeds of such redemption in
Class C Shares of the Fund with credit given for any contingent deferred sales
charge paid upon such redemption. Such reinstatement is made at the net asset
value per share (without sales charge) next determined after the order is
received, which must be made within 180 days after the date of the redemption.
Reinstatement at net asset value per share is also offered to participants in
those eligible retirement plans held or administered by Van Kampen Trust Company
for repayment of principal (and interest) on their borrowings on such plans.
There is no reinstatement privilege for Class D Shares.


                              REDEMPTION OF SHARES

     Redemptions are not made on days during which the New York Stock Exchange
("the Exchange") is closed. The right of redemption may be suspended and the
payment therefor may be postponed for more than seven days during any period
when (a) the Exchange is closed for other than customary weekends or holidays;
(b) the SEC determines trading on the Exchange is restricted; (c) the SEC
determines an emergency exists as a result of which disposal by the Fund of
securities owned by it is not reasonably practicable or it is not reasonably
practicable for the Fund to fairly determine the value of its net assets; or (d)
the SEC, by order, so permits.

                                      B-34
<PAGE>   52

     In addition, if the Board of Trustees determines that payment wholly or
partly in cash would be detrimental to the best interests of the remaining
shareholders of the Fund, the Fund may pay the redemption proceeds in whole or
in part by a distribution-in-kind of portfolio securities held by the Fund in
lieu of cash in conformity with applicable rules of the SEC. A
distribution-in-kind will result in recognition by the shareholder of a gain or
loss for federal income tax purposes when such securities are distributed, and
the shareholder may have brokerage charges and a gain or loss for federal income
tax purposes upon the shareholder's subsequent disposition of such securities.

                    CONTINGENT DEFERRED SALES CHARGE-CLASS A

     As described in the Prospectus under "Purchase of Shares--Class A Shares,"
there is no sales charge payable on Class A Shares at the time of purchase on
investments of $1 million or more, but a contingent deferred sales charge
("CDSC--Class A") may be imposed on certain redemptions made within one year of
purchase. For purposes of the CDSC-Class A, when shares of one fund are
exchanged for shares of another fund, the purchase date for the shares of the
fund exchanged into will be assumed to be the date on which shares were
purchased in the fund from which the exchange was made. If the exchanged shares
themselves are acquired through an exchange, the purchase date is assumed to
carry over from the date of the original election to purchase shares subject to
a CDSC-Class A rather than a front-end load sales charge. In determining whether
a CDSC-Class A is payable, it is assumed that shares being redeemed first are
any shares in the shareholder's account not subject to a contingent deferred
sales charge followed by shares held the longest in the shareholder's account.
The contingent deferred sales charge is assessed on an amount equal to the
lesser of the then current market value or the cost of the shares being
redeemed. Accordingly, no sales charge is imposed on increases in net asset
value above the initial purchase price. In addition, no sales charge is assessed
on shares derived from reinvestment of dividends or capital gains dividends.

               WAIVER OF CLASS B AND CLASS C CONTINGENT DEFERRED
                                 SALES CHARGES

     As described in the Prospectus under "Redemption of Shares," redemptions of
Class B Shares and Class C Shares will be subject to a contingent deferred sales
charge ("CDSC-Class B and C"). The CDSC-Class B and C is waived on redemptions
of Class B Shares and Class C Shares in the circumstances described below:

REDEMPTION UPON DEATH OR DISABILITY

     The Fund will waive the CDSC-Class B and C on redemptions following the
death or disability of a Class B shareholder and Class C shareholder. An
individual will be considered disabled for this purpose if he or she meets the
definition thereof in Section 72(m)(7) of the Internal Revenue Code of 1986, as
amended (the "Code"), which in pertinent part defines a person as disabled if
such person "is unable to engage in any substantial gainful activity by reason
of any medically determinable physical or mental impairment which can be
expected to result in death or to be of long-continued and indefinite duration."
While the Fund does not specifically adopt the balance of the Code's definition
which pertains to furnishing the Secretary of Treasury with such proof as he or

                                      B-35
<PAGE>   53

she may require, the Distributor will require satisfactory proof of death or
disability before it determines to waive the CDSC-Class B and C.

     In cases of death or disability, the CDSC-Class B and C will be waived
where the decedent or disabled person is either an individual shareholder or
owns the shares as a joint tenant with right of survivorship or is the
beneficial owner of a custodial or fiduciary account, and where the redemption
is made within one year of the death or initial determination of disability.
This waiver of the CDSC-Class B and C applies to a total or partial redemption,
but only to redemptions of shares held at the time of the death or initial
determination of disability.

REDEMPTION IN CONNECTION WITH CERTAIN DISTRIBUTIONS FROM RETIREMENT PLANS

     The Fund will waive the CDSC-Class B and C when a total or partial
redemption is made in connection with certain distributions from retirement
plans. The CDSC-Class B and C will be waived upon the tax-free rollover or
transfer of assets to another retirement plan invested in one or more
Participating Funds; in such event, as described below, the Fund will "tack" the
period for which the original shares were held on to the holding period of the
shares acquired in the transfer or rollover for purposes of determining what, if
any, CDSC-Class B and C is applicable in the event that such acquired shares are
redeemed following the transfer or rollover. The charge also will be waived on
any redemption which results from the return of an excess contribution pursuant
to Section 408(d)(4) or (5) of the Code, the return of excess deferral amounts
pursuant to U.S. Treasury Regulations Section 1.401(k)(8) or 402(g)(2), the
financial hardship of the employee pursuant to Code Section 401(k)-1(d)(2), or
from the death or disability of the employee (see Code Section 72(m)(7) and
72(t)(2)(A)(ii)). In addition, the charge will be waived on any minimum
distribution required to be distributed in accordance with Code Section
401(a)(9).

REDEMPTION PURSUANT TO THE FUND'S SYSTEMATIC WITHDRAWAL PLAN

     A shareholder may elect to participate in a systematic withdrawal plan with
respect to the shareholder's investment in the Fund. Under the systematic
withdrawal plan, a dollar amount of a participating shareholder's investment in
the Fund will be redeemed systematically by the Fund on a periodic basis, and
the proceeds sent to the designated payee of record shareholder. The amount to
be redeemed and frequency of the systematic withdrawals will be specified by the
shareholder upon his or her election to participate in the systematic withdrawal
plan. The CDSC-Class B and C will be waived on redemptions made under the
systematic withdrawal plan.

     The amount of the shareholder's investment in the Fund at the time the
election to participate in the systematic withdrawal plan is made with respect
to the Fund is hereinafter referred to as the "initial account balance." The
amount to be systematically redeemed from the Fund without the imposition of a
CDSC-Class B and C may not exceed a maximum of 12% annually of the shareholder's
initial account balance. The Fund reserves the right to change the terms and
conditions of the systematic withdrawal plan and the ability to offer the
systematic withdrawal plan.

                                      B-36
<PAGE>   54

NO INITIAL COMMISSION OR TRANSACTION FEE

     The Fund will waive the CDSC-Class B and C in circumstances under which no
commission or transaction fee is paid to authorized dealers at the time of
purchase of shares. See "Purchase of Shares -- Waiver of Contingent Deferred
Sales Charge" in the Prospectus.

INVOLUNTARY REDEMPTIONS OF SHARES

     The Fund reserves the right to redeem shareholder accounts with balances of
less than a specified dollar amount as set forth in the Prospectus. Prior to
such redemptions, shareholders will be notified in writing and allowed a
specified period of time to purchase additional shares to bring the value of the
account up to the required minimum balance. The Fund will waive the CDSC-Class B
and C upon such involuntary redemption.

REINVESTMENT OF REDEMPTION PROCEEDS

     A shareholder who has redeemed Class C Shares of the Fund may reinvest at
net asset value, with credit for any CDSC-Class C paid on the redeemed shares,
any portion or all of his or her redemption proceeds (plus that amount necessary
to acquire a fractional share to round off his or her purchase to the nearest
full share) in Class C Shares of the Fund, provided that the reinvestment is
effected within 180 days after such redemption and the shareholder has not
previously exercised this reinvestment privilege with respect to Class C Shares
of the Fund. Shares acquired in this manner will be deemed to have the original
cost and purchase date of the redeemed shares for purposes of applying the
CDSC-Class C to subsequent redemptions.

REDEMPTION BY ADVISER

     The Fund may waive the CDSC-Class B and C when a total or partial
redemption is made by the Adviser with respect to its investments in the Fund.

                                    TAXATION

FEDERAL INCOME TAXATION OF THE FUND

     The Fund has elected and qualified, and intends to continue to qualify each
year, to be treated as a regulated investment company under Subchapter M of the
Code. To qualify as a regulated investment company, the Fund must comply with
certain requirements of the Code relating to, among other things, the source of
its income and diversification of its assets.

     If the Fund so qualifies and distributes each year to its shareholders at
least 90% of its investment company taxable income (including taxable income and
net short-term capital gain, but not net capital gain, which is the excess of
net long-term capital gain over net short-term capital loss) and meets certain
other requirements, it will not be required to pay federal income taxes on any
income it distributes to shareholders. The Fund intends to distribute at least
the minimum amount of investment company taxable income necessary to satisfy the
90% distribution requirement. The Fund will not be subject to federal income tax
on any net capital gain distributed to shareholders.

                                      B-37
<PAGE>   55

     In order to avoid a 4% excise tax, the Fund will be required to distribute,
by December 31st of each year, at least an amount equal to the sum of (i) 98% of
its ordinary income for such year and (ii) 98% of its capital gain net income
(the latter of which generally is computed on the basis of the one-year period
ending on October 31st of such year), plus any amounts that were not distributed
in previous taxable years. For purposes of the excise tax, any ordinary income
or capital gain net income retained by, and subject to federal income tax in the
hands of, the Fund will be treated as having been distributed.

     If the Fund failed to qualify as a regulated investment company or failed
to satisfy the 90% distribution requirement in any taxable year, the Fund would
be taxed as an ordinary corporation on its taxable income (even if such income
were distributed to its shareholders) and all distributions out of earnings and
profits would be taxed to shareholders as ordinary income. To qualify again as a
regulated investment company in a subsequent year, the Fund may be required to
pay an interest charge on 50% of its earnings and profits attributable to
non-regulated investment company years and would be required to distribute such
earnings and profits to shareholders (less any interest charge). In addition, if
the Fund failed to qualify as a regulated investment company for its first
taxable year or, if immediately after qualifying as a regulated investment
company for any taxable year, it failed to qualify for a period greater than one
taxable year, the Fund would be required to recognize any net built-in gains
(the excess of aggregate gains, including items of income, over aggregate losses
that would have been realized if it had been liquidated) in order to qualify as
a regulated investment company in a subsequent year.

     Some of the Fund's investment practices are subject to special provisions
of the Code that may, among other things, defer the use of certain losses of the
Fund, affect the holding period of the securities held by the Fund and alter the
character of the gains or losses realized by the Fund. These provisions may also
require the Fund to recognize income or gain without receiving cash with which
to make distributions in amounts necessary to satisfy the 90% distribution
requirement and the distribution requirements for avoiding income and excise
taxes. The Fund will monitor its transactions and may make certain tax elections
in order to mitigate the effect of these rules and prevent disqualification of
the Fund as a regulated investment company.

     PASSIVE FOREIGN INVESTMENT COMPANIES. The Fund may invest in the stock of
"passive foreign investment companies" ("PFICs"). A PFIC is a foreign
corporation that, in general, meets either of the following tests: (i) at least
75% of its gross income is passive income or (ii) an average of at least 50% of
its assets produce, or are held for the production of, passive income. Under
certain circumstances, a regulated investment company that holds stock of a PFIC
will be subject to federal income tax on (i) a portion of any "excess
distribution" received on such stock or (ii) any gain from a sale or disposition
of such stock (collectively, "PFIC income"), plus interest on such amounts, even
if the regulated investment company distributes the PFIC income as a taxable
dividend to its shareholders. The balance of the PFIC income will be included in
the regulated investment company's investment company taxable income and,
accordingly, will not be taxable to it to the extent that income is distributed
to its shareholders. If the Fund invests in a PFIC and elects to treat the PFIC
as a "qualified electing fund," then in lieu of the foregoing tax and interest
obligation, the Fund would be required to include in income each year its pro
rata share of the qualified electing fund's annual ordinary

                                      B-38
<PAGE>   56

earnings and net capital gain, which most likely would have to be distributed to
satisfy the 90% distribution requirement and the distribution requirement for
avoiding income and excise taxes. In most instances it will be very difficult to
make this election due to certain requirements imposed with respect to the
election.

     As an alternative to making the above-described election to treat the PFIC
as a qualified electing fund, the Fund may make an election to annually
mark-to-market PFIC stock that it owns (a "PFIC Mark-to-Market Election").
"Marking-to-market," in this context, means recognizing as ordinary income or
loss each year an amount equal to the difference between the Fund's adjusted tax
basis in such PFIC stock and its fair market value. Losses will be allowed only
to the extent of net mark-to-market gain previously included by the Fund
pursuant to the election for prior taxable years. The Fund may be required to
include in its taxable income for the first taxable year in which it makes a
PFIC Mark-to-Market Election an amount equal to the interest charge that would
otherwise accrue with respect to distributions on, or dispositions of, the PFIC
stock. This amount would not be deductible from the Fund's taxable income. The
PFIC Mark-to-Market Election applies to the taxable year for which made and to
all subsequent taxable years, unless the Internal Revenue Service (the "IRS")
consents to revocation of the election. By making the PFIC Mark-to-Market
Election, the Fund could ameliorate the adverse tax consequences arising from
its ownership of PFIC stock, but in any particular year may be required to
recognize income in excess of the distributions it receives from the PFIC and
proceeds from the dispositions of PFIC stock.

DISTRIBUTIONS TO SHAREHOLDERS

     Distributions of the Fund's investment company taxable income are taxable
to shareholders as ordinary income to the extent of the Fund's earnings and
profits, whether paid in cash or reinvested in additional shares. Distributions
of the Fund's net capital gain as capital gain dividends, if any, are taxable to
shareholders as long-term capital gain regardless of the length of time shares
of the Fund have been held by such shareholders. Distributions in excess of the
Fund's earnings and profits will first reduce the adjusted tax basis of a
holder's shares and, after such adjusted tax basis is reduced to zero, will
constitute capital gains to such holder (assuming such shares are held as a
capital asset). For a summary of the maximum tax rates applicable to capital
gains (including capital gain dividends), see "Capital Gains Rates" below.
Tax-exempt shareholders not subject to federal income tax on their income
generally will not be taxed on distributions from the Fund.

     Shareholders receiving distributions in the form of additional shares
issued by the Fund will be treated for federal income tax purposes as receiving
a distribution in an amount equal to the fair market value of the shares
received, determined as of the distribution date. The basis of such shares will
equal the fair market value on the distribution date.

     The Fund will inform shareholders of the source and tax status of all
distributions promptly after the close of each calendar year. Some portion of
the distributions from the Fund may be eligible for the dividends received
deduction for corporations during the year if the Fund receives qualifying
dividends during the year and if certain requirements of the Code are satisfied.

                                      B-39
<PAGE>   57

     Although dividends generally will be treated as distributed when paid,
dividends declared in October, November or December, payable to shareholders of
record on a specified date in such month and paid during January of the
following year will be treated as having been distributed by the Fund and
received by the shareholders on the December 31st prior to the date of payment.
In addition, certain other distributions made after the close of a taxable year
of the Fund may be "spilled back" and treated as paid by the Fund (except for
purposes of the 4% excise tax) during such taxable year. In such case,
shareholders will be treated as having received such dividends in the taxable
year in which the distribution was actually made.

     Income from investments in foreign securities received by the Fund may be
subject to income, withholding or other taxes imposed by foreign countries and
U.S. possessions. Such taxes will not be deductible or creditable by
shareholders. Tax conventions between certain countries and the United States
may reduce or eliminate such taxes.

     Certain foreign currency gains or losses attributable to currency exchange
rate fluctuations are treated as ordinary income or loss. Such income or loss
may increase or decrease (or possibly eliminate) the Fund's income available for
distribution. If, under the rules governing the tax treatment of foreign
currency gains and losses, the Fund's income available for distribution is
decreased or eliminated, all or a portion of the dividends declared by the Fund
may be treated for federal income tax purposes as a return of capital or, in
some circumstances, as capital gains. Generally, a shareholder's tax basis in
Fund shares will be reduced to the extent that an amount distributed to such
shareholder is treated as a return of capital.

SALE OF SHARES

     The sale of shares (including transfers in connection with a redemption or
repurchase of shares) may be a taxable transaction for federal income tax
purposes. Selling shareholders will generally recognize gain or loss in an
amount equal to the difference between their adjusted tax basis in the shares
and the amount received. If such shares are held as a capital asset, the gain or
loss will be a capital gain or loss. For a summary of the tax rates applicable
to capital gains (including capital gain dividends), see "Capital Gains Rates"
below. Any loss recognized upon a taxable disposition of shares held for six
months or less will be treated as a long-term capital loss to the extent of any
capital gain dividends received with respect to such shares. For purposes of
determining whether shares have been held for six months or less, the holding
period is suspended for any periods during which the shareholder's risk of loss
is diminished as a result of holding one or more other positions in
substantially similar or related property or through certain options or short
sales.

CAPITAL GAINS RATES

     The maximum tax rate applicable to net capital gains recognized by
individuals and other non-corporate taxpayers investing in the Fund is (i) the
same as the maximum ordinary income tax rate for capital assets held for one
year or less or (ii) 20% for capital assets held for more than one year. The
maximum long-term capital gains rate for corporations is 35%.

                                      B-40
<PAGE>   58

NON-U.S. SHAREHOLDER

     A shareholder who is not (i) a citizen or resident of the United States,
(ii) a corporation or partnership created or organized under the laws of the
United States or any state thereof, (iii) an estate, the income of which is
subject to United States federal income taxation regardless of its source or
(iv) a trust whose administration is subject to the primary supervision of a
United States court and which has one or more United States fiduciaries who have
the authority to control all substantial decisions of the trust (a "Non-U.S.
Shareholder") generally will be subject to withholding of United States federal
income tax at a 30% rate (or lower applicable treaty rate) on dividends from the
Fund (other than capital gain dividends) that are not "effectively connected"
with a United States trade or business carried on by such shareholder.
Accordingly, investment in the Fund is likely to be appropriate for a Non-U.S.
Shareholder only if such person can utilize a foreign tax credit or
corresponding tax benefit in respect of such U.S. withholding tax.

     Non-effectively connected capital gain dividends and gains realized from
the sale of shares will not be subject to United States federal income tax in
the case of (i) a Non-U.S. Shareholder that is a corporation and (ii) an
individual Non-U.S. Shareholder who is not present in the United States for more
than 182 days during the taxable year (assuming that certain other conditions
are met). However, certain Non-U.S. Shareholders may nonetheless be subject to
backup withholding on capital gain dividends and gross proceeds paid to them
upon the sale of their shares. See "Backup Withholding" below.

     If income from the Fund or gains realized from the sale of shares is
effectively connected with a Non-U.S. Shareholder's United States trade or
business, then such amounts will be subject to United States federal income tax
on a net basis at the tax rates applicable to United States citizens or domestic
corporations. Non-U.S. Shareholders that are corporations may also be subject to
an additional "branch profits tax" with respect to income from the Fund that is
effectively connected with a United States trade or business.

     United States Treasury regulations, generally effective for payments made
after December 31, 2000, modify the withholding, backup withholding and
information reporting rules including the procedures to be followed by foreign
investors in establishing foreign status. Prospective foreign investors should
consult their tax advisors concerning the applicability and effect of such
Treasury regulations on an investment in shares of the Fund.

     The tax consequences to a Non-U.S. Shareholder entitled to claim the
benefits of an applicable tax treaty may be different from those described in
this section. Non-U.S. Shareholders may be required to provide appropriate
documentation to establish their entitlement to the benefits of such a treaty.
Foreign investors are advised to consult their tax advisers with respect to the
tax implications of purchasing, holding and disposing of shares of the Fund.

BACKUP WITHHOLDING

     The Fund may be required to withhold federal income tax at a rate of 31%
("backup withholding") from dividends and redemption proceeds paid to
non-corporate shareholders. This tax may be withheld from dividends if (i) the
shareholder fails to furnish the Fund with its correct taxpayer identification
number, (ii) the IRS notifies the Fund that the

                                      B-41
<PAGE>   59

shareholder has failed to properly report certain interest and dividend income
to the IRS and to respond to notices to that effect or (iii) when required to do
so, the shareholder fails to certify that he or she is not subject to backup
withholding. Redemption proceeds may be subject to withholding under the
circumstances described in (i) above.

     Backup withholding is not an additional tax. Any amounts withheld under the
backup withholding rules from payments made to a shareholder may be refunded or
credited against such shareholder's U.S. federal income tax liability, if any,
provided that the required information is furnished to the IRS.

INFORMATION REPORTING

     The Fund must report annually to the IRS and to each shareholder (other
than a Non-U.S. Shareholder) the amount of dividends paid to such shareholder
and the amount, if any, of tax withheld pursuant to backup withholding rules
with respect to such dividends. In the case of a Non-U.S. Shareholder, the Fund
must report to the IRS and such shareholder the aggregate amount of dividends
paid that are subject to backup withholding (if any) and the amount of tax
withheld with respect to such dividends pursuant to the backup withholding
rules. This information may also be made available to the tax authorities in the
Non-U.S. Shareholder's country of residence. Generally, dividends paid to
Non-U.S. Shareholders that are subject to the 30% federal income tax withholding
described above under "Non-U.S. Shareholders" are not subject to backup
withholding.

GENERAL

     The federal income tax discussion set forth above is for general
information only. Prospective investors and shareholders should consult their
advisers regarding the specific federal tax consequences of purchasing, holding
and disposing of shares, as well as the effects of state, local and foreign tax
law and any proposed tax law changes.

                                FUND PERFORMANCE

     From time to time the Fund may advertise its total return for prior
periods. Any such advertisement would include at least average annual total
return quotations for one-year, five-year and ten-year periods. Other total
return quotations, aggregate or average, over other time periods may also be
included.

     The total return of the Fund for a particular period represents the
increase (or decrease) in the value of a hypothetical investment in the Fund
from the beginning to the end of the period. Total return is calculated by
subtracting the value of the initial investment from the ending value and
showing the difference as a percentage of the initial investment; the
calculation assumes the initial investment is made at the current maximum public
offering price (which includes the maximum sales charge for Class A Shares);
that all income dividends or capital gain dividends during the period are
reinvested in Fund shares at net asset value; and that any applicable contingent
deferred sales charge has been paid. The Fund's total return will vary depending
on market conditions, the securities comprising the Fund's portfolio, the Fund's
operating expenses and unrealized net capital gains or losses during the period.
Since Class A Shares of the Fund were offered at a maximum sales charge of 8.50%
prior to June 12, 1989, actual Fund total return would have been somewhat less
than that computed on the basis of the current maximum sales
                                      B-42
<PAGE>   60

charge. Total return is based on historical earnings and asset value
fluctuations and is not intended to indicate future performance. No adjustments
are made to reflect any income taxes payable by shareholders on dividends, and
capital gain dividends paid by the Fund, or to reflect the fact that 12b-1 fees
may have previously been less than the current 12b-1 fees for certain classes of
shares as specified in the Prospectus.

     Average annual total return quotations are computed by finding the average
annual compounded rate of return over the period that would equate the initial
amount invested to the ending redeemable value.


     Total return is calculated separately for Class A Shares, Class B Shares,
Class C Shares and Class D Shares of the Fund. Total return figures for Class A
Shares include the maximum sales charge; total return figures for Class B Shares
and Class C Shares include any applicable contingent deferred sales charge.
Because of the differences in sales charges and distribution fees, the total
returns for each class of shares will differ.


     The Fund may, in supplemental sales literature, advertise non-standardized
total return figures representing the cumulative, non-annualized total return of
each class of shares of the Fund from a given date to a subsequent given date.
Cumulative non-standardized total return is calculated by measuring the value of
an initial investment in a given class of shares of the Fund at a given time,
deducting the maximum initial sales charge, if any, determining the value of all
subsequent reinvested distributions, and dividing the net change in the value of
the investment as of the end of the period by the amount of the initial
investment and expressing the result as a percentage. Non-standardized total
return will be calculated separately for each class of shares.

     Non-standardized total return calculations do not reflect the imposition of
a contingent deferred sales charge, and if any such contingent deferred sales
charge imposed at the time of redemption were reflected, it would reduce the
performance quoted.

     From time to time, the Fund may include in its sales literature and
shareholder reports a quotation of the current "distribution rate" for each
class of shares of the Fund. Distribution rate is a measure of the level of
income and short-term capital gain dividends, if any, distributed for a
specified period. Distribution rate differs from yield, which is a measure of
the income actually earned by the Fund's investments, and from total return
which is a measure of the income actually earned by the Fund's investments plus
the effect of any realized and unrealized appreciation or depreciation of such
investments during a stated period. Distribution rate is, therefore, not
intended to be a complete measure of the Fund's performance. Distribution rate
may sometimes be greater than yield since, for instance, it may not include the
effect of amortization of bond premiums, and may include non-recurring
short-term capital gain and premiums from futures transactions engaged in by the
Fund. Distribution rates will be computed separately for each class of the
Fund's shares.

     From time to time marketing materials may provide a portfolio manager
update, an Adviser update and discuss general economic conditions and outlooks.
The Fund's marketing materials may also show the Fund's asset class
diversification, top sector holdings and largest holdings. Materials may also
mention how the Distributor believes the Fund compares relative to other Van
Kampen funds. Materials may also discuss the Dalbar Financial Services study
from 1984 to 1994 which studied investor cash flow into and out of all types of
mutual funds. The ten-year study found that investors who bought

                                      B-43
<PAGE>   61

mutual fund shares and held such shares outperformed investors who bought and
sold. The Dalbar study conclusions were consistent regardless of whether
shareholders purchased their fund shares in direct or sales force distribution
channels. The study showed that investors working with a professional
representative have tended over time to earn higher returns than those who
invested directly. The performance of the funds purchased in the Dalbar Study
and the conclusions based thereon are not necessarily indicative of future
performance of such funds or conclusions that may result from similar studies in
the future. The Fund may also be marketed on the internet.

     In reports or other communications to shareholders or in advertising
material, the Fund may compare its performance with that of other mutual funds
as listed in the rankings or ratings prepared by Lipper Analytical Services,
Inc., CDA, Morningstar Mutual Funds or similar independent services which
monitor the performance of mutual funds with the Consumer Price Index, the Dow
Jones Industrial Average, Standard & Poor's indices, NASDAQ Composite Index,
other appropriate indices of investment securities, or with investment or
savings vehicles. The performance information may also include evaluations of
the Fund published by nationally recognized ranking or rating services and by
nationally recognized financial publications. Such comparative performance
information will be stated in the same terms in which the comparative data or
indices are stated. Such advertisements and sales material may also include a
yield quotation as of a current period. In each case, such total return and
yield information, if any, will be calculated pursuant to rules established by
the SEC and will be computed separately for each class of the Fund's shares. For
these purposes, the performance of the Fund, as well as the performance of other
mutual funds or indices, do not reflect sales charges, the inclusion of which
would reduce the Fund's performance. The Fund will include performance data for
each class of shares of the Fund in any advertisement or information including
performance data of the Fund.

     The Fund may also utilize performance information in hypothetical
illustrations. For example, the Fund may, from time to time: (1) illustrate the
benefits of tax-deferral by comparing taxable investments to investments made
through tax-deferred retirement plans; (2) illustrate in graph or chart form, or
otherwise, the benefits of dollar cost averaging by comparing investments made
pursuant to a systematic investment plan to investments made in a rising market;
(3) illustrate allocations among different types of mutual funds for investors
at different stages of their lives; and (4) in reports or other communications
to shareholders or in advertising material, illustrate the benefits of
compounding at various assumed rates of return.

     The Fund's Annual Report and Semiannual Report contain additional
performance information. A copy of the Annual Report or Semiannual Report may be
obtained without charge by calling or writing the Fund at the telephone number
and address printed on the cover of this Statement of Additional Information.

CLASS A SHARES

     The Fund's average annual total return, assuming payment of the maximum
sales charge, for Class A Shares of the Fund for (i) the one-year period ended
December 31, 1999 was 19.25%, (ii) the five-year period ended December 31, 1999
was 25.64% and (iii) the ten-year period ended December 31, 1999 was 17.66%.

                                      B-44
<PAGE>   62

     The Fund's cumulative non-standardized total return, including payment of
the maximum sales charge, with respect to the Class A Shares from its inception
to December 31, 1999 was 38832.01%.

     The Fund's cumulative non-standardized total return, excluding payment of
the maximum sales charge, with respect to the Class A Shares from its inception
to December 31, 1999 was 41163.26%.

CLASS B SHARES

     The Fund's average annual total return, assuming payment of the contingent
deferred sales charge, for Class B Shares of the Fund for (i) the one-year
period ended December 31, 1999 was 20.53%, (ii) the five-year period ended
December 31, 1999 was 26.01%, and (iii) the approximately eight-year period
since December 20, 1991, the commencement of distribution for Class B Shares of
the Fund, through December 31, 1999 was 19.49%.

     The Fund's cumulative non-standardized total return, including payment of
the contingent deferred sales charge, with respect to the Class B Shares from
December 20, 1991 (commencement of distribution of Class B Shares) to December
31, 1999 was 318.22%.

     The Fund's cumulative non-standardized total return, excluding payment of
the contingent deferred sales charge, with respect to the Class B Shares from
December 20, 1991 (commencement of distribution of Class B Shares) to December
31, 1999 was 318.22%.

CLASS C SHARES

     The Fund's average annual total return, assuming payment of the contingent
deferred sales charge, for Class C Shares of the Fund for (i) the one-year
period ended December 31, 1999 was 24.59%, (ii) the five-year period ended
December 31, 1999 was 26.17%, and (iii) the approximately six-year, six-month
period since July 20, 1993, the commencement of distribution for Class C Shares
of the Fund, through December 31, 1999 was 20.66%.

     The Fund's cumulative non-standardized total return, including payment of
the contingent deferred sales charge, with respect to the Class C Shares from
July 20, 1993 (commencement of distribution of Class C Shares) to December 31,
1999 was 235.79%.

     The Fund's cumulative non-standardized total return, excluding payment of
the contingent deferred sales charge, with respect to the Class C Shares from
December 31, 1993 (commencement of distribution of Class C Shares) to December
31, 1999 was 235.79%.

     These results are based on historical earnings and asset value fluctuations
and are not intended to indicate future performance. Such information should be
considered in light of the Fund's investment objective and policies as well as
the risks incurred in the Fund's investment practices.

                                      B-45
<PAGE>   63


CLASS D SHARES



     Class D Shares have not been offered prior to the date of this Statement of
Additional Information and have no historical performance information to report.


                               OTHER INFORMATION

CUSTODY OF ASSETS

     All securities owned by the Fund and all cash, including proceeds from the
sale of shares of the Fund and of securities in the Fund's investment portfolio,
are held by State Street Bank and Trust Company, 225 West Franklin Street,
Boston, Massachusetts 02110, as custodian. The Custodian also provides
accounting services to the Fund.

SHAREHOLDER REPORTS

     Semiannual statements are furnished to shareholders, and annually such
statements are audited by the independent accountants.


INDEPENDENT AUDITORS



     Independent auditors for the Fund perform an annual audit of the Fund's
financial statements. The Fund's Board of Trustees has engaged Ernst & Young
LLP, located at 233 South Wacker Drive, Chicago, Illinois 60606, to be the
Fund's independent auditors. The change in independent auditors was approved by
the Fund's audit committee and the Fund's Board of Trustees, including Trustees
who are not "interested persons" of the Fund (as defined in the 1940 Act).



     PricewaterhouseCoopers LLP, located at 200 East Randolph Drive, Chicago,
Illinois 60601 ("PWC"), ceased being the Fund's independent auditors effective
May 25, 2000. The cessation of the client-auditor relationship between the Fund
and PWC was based solely on a possible future business relationship by PWC with
an affiliate of the Fund's investment adviser. The change in independent
auditors was approved by the Fund's audit committee and the Fund's Board of
Trustees, including Trustees who are not "interested persons" of the Fund (as
defined in the 1940 Act).


LEGAL COUNSEL

     Counsel to the Fund is Skadden, Arps, Slate, Meagher & Flom (Illinois).

                                      B-46
<PAGE>   64

                           PART C. OTHER INFORMATION

ITEM 23. EXHIBITS


<TABLE>
<S>    <C>     <C>
(a)    (1)     First Amended and Restated Agreement and Declaration of
               Trust(1)
       (2)     Certificate of Amendment(1)
       (3)     Second Certificate of Amendment(6)
       (4)     Amended and Restated Certificate of Designation(5)
       (5)     Second Amended and Restated Certificate of Designation(6)
       (6)     Third Amended and Restated Certificate of Designation+
(b)            Amended and Restated Bylaws(1)
(c)    (1)     Specimen Class A Share Certificate(2)
       (2)     Specimen Class B Share Certificate(2)
       (3)     Specimen Class C Share Certificate(2)
               Specimen Class D Share Certificate+
(d)            Investment Advisory Agreement(5)
(e)    (1)     Distribution and Service Agreement(5)
       (2)     Form of Dealer Agreement(2)
       (3)     Form of Broker Fully Disclosed Selling Agreement(2)
       (4)     Form of Bank Fully Disclosed Selling Agreement(2)
(f)    (1)     Form of Trustee Deferred Compensation Plan(7)
       (2)     Form of Trustee Retirement Plan(7)
(g)    (1)     Custodian Agreement(3)
       (2)     Transfer Agency and Service Agreement(5)
(h)    (1)     Data Services Agreement(2)
       (2)     Fund Accounting Agreement(4)
(i)    (1)     Opinion of Counsel of Skadden, Arps, Slate, Meagher & Flom
               (Illinois)(2)
       (2)     Consent of Skadden, Arps, Slate, Meagher & Flom (Illinois)+
(j)    (1)     Consent of Ernst & Young LLP+
       (2)     Consent of PricewaterhouseCoopers LLP+
(k)            Not applicable
(l)            Not applicable
(m)    (1)     Plan of Distribution Pursuant to Rule 12b-1(2)
       (2)     Form of Shareholder Assistance Agreement(2)
       (3)     Form of Administrative Services Agreement(2)
       (4)     Service Plan(2)
(n)            Not applicable
(o)            Amended Multiple Class Plan+
(p)            Code of Ethics+
(q)            Power of Attorney(8)
(z)    (1)     List of Certain Investment Companies in Response to Item
               27(a)(8)
       (2)     List of Officers and Directors of Van Kampen Funds Inc. in
               Response to Item 27(b)(8)
</TABLE>


---------------
 (1) Incorporated herein by reference to Post-Effective Amendment No. 34 to
     Registrant's Registration Statement on Form N-1A, File Number 2-10559,
     filed April 24, 1996.

 (2) Incorporated herein by reference to Post-Effective Amendment No. 35 to
     Registrant's Registration Statement on Form N-1A, File Number 2-10559,
     filed April 28, 1997.

 (3) Incorporated herein by reference to Post-Effective Amendment No. 75 to Van
     Kampen American Capital Growth and Income Fund Registration Statement on
     Form N-1A, File Number 2-21657, filed March 27, 1998.

 (4) Incorporated herein by reference to Post-Effective Amendment No. 50 to Van
     Kampen American Capital Comstock Fund Registration Statement on Form N-1A,
     File Number 2-27778, filed April 27, 1998.

 (5) Incorporated herein by reference to Post-Effective Amendment No. 36 to
     Registrant's Registration Statement on Form N-1A, File Number 2-10559,
     filed April 28, 1998.

 (6) Incorporated herein by reference to Post-Effective Amendment No. 37 to
     Registrant's Registration Statement on Form N-1A, File Number 2-10559,
     filed February 25, 1999.

                                       C-1
<PAGE>   65

 (7) Incorporated herein by reference to Van Kampen Harbor Fund's Post-Effective
     Amendment No. 81 to Registrant's Registration Statement on Form N-1A, File
     Number 2-12685 and 811-734, filed on April 29, 1999.


 (8) Incorporated herein by reference to Post-Effective Amendment No. 39 to
     Registrant's Registration Statement on Form N-1A, File Number 2-10559,
     filed April 28, 2000.



 +  To be filed by further amendment.


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

     None.

ITEM 25. INDEMNIFICATION.

     Pursuant to Del. Code Ann. Title 12, Section 3817, a Delaware business
trust may provide in its governing instrument for the indemnification of its
officers and trustees from and against any and all claims and demands
whatsoever.

     Reference is made to Article 8, Section 8.4 of the Registrant's Agreement
and Declaration of Trust as amended. Article 8; Section 8.4 of the Agreement and
Declaration of Trust provides that each officer and trustee of the Registrant
shall be indemnified by the Registrant against all liabilities incurred in
connection with the defense or disposition of any action, suit or other
proceeding, whether civil or criminal, in which the officer or trustee may be or
may have been involved by reason of being or having been an officer or trustee,
except that such indemnity shall not protect any such person against a liability
to the Registrant or any shareholder thereof to which such person would
otherwise be subject by reason of (i) not acting in good faith in the reasonable
belief that such person's actions were not in the best interest of the Trust,
(ii) willful misfeasance, bad faith, gross negligence or reckless disregard of
the duties involved in the conduct of his or her office, or (iii) for a criminal
proceeding, not having a reasonable cause to believe that such conduct was
unlawful (collectively "Disabling Conduct"). Absent a court determination that
an officer or trustee seeking indemnification was not liable on the merits or
guilty of Disabling Conduct in the conduct of his or her office, the decision by
the Registrant to indemnify such person must be based upon the reasonable
determination of independent counsel or non-party independent trustees, after
review of the facts, that such officer or trustee is not guilty of Disabling
Conduct in the conduct of his or her office.

     The Registrant has purchased insurance on behalf of its officers and
trustees protecting such persons from liability arising from their activities as
officers or trustees of the Registrant. The insurance does not protect or
purport to protect such persons from liability to the Registrant or to its
shareholders to which such officer or trustee would otherwise be subject by
reason of willful misfeasance, bad faith, gross negligence or reckless disregard
of the duties involved in the conduct of their office.


     Conditional advancing of indemnification monies may be made if the trustee
or officer undertakes to repay the advance and only if the following conditions
are met: (1) the trustee or officer provides a security for the undertaking; (2)
the Registrant is insured against losses arising from lawful advances; or (3) a
majority of a quorum of the Registrant's disinterested, non-party trustees, or
an independent legal counsel in a written opinion, shall determine, based upon a
review of readily available facts, that a recipient of the advance ultimately
will be found entitled to indemnification.


     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 (the "1933 Act") may be permitted to trustees, officers and controlling
persons of the Registrant pursuant to the foregoing provisions or otherwise, the
Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the
1933 Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by the trustee, officer, or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such trustee, officer or controlling person in
connection with the shares being registered, the Registrant will, unless in the
opinion of its counsel the matter has been settled by controlling

                                       C-2
<PAGE>   66

precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the 1933 Act
and will be governed by the final adjudication of such issue.

     Pursuant to Section 7 of the Distribution and Service Agreement, the
Registrant agrees to indemnify and hold harmless Van Kampen Funds Inc. (the
"Distributor") and each of its trustees and officers and each person if any, who
controls the Distributor within the meaning of Section 15 of the 1933 Act
against any loss, liability, claim, damages or expense (including the reasonable
cost of investigating or defending any alleged loss, liability, claim, damages,
or expense and reasonable counsel fees) arising by reason of any person
acquiring any shares, based upon the ground that the Registration Statement,
prospectus, shareholder reports or other information filed or made public by the
Registrant (as from time to time amended) included an untrue statement of a
material fact or omitted to state a material fact required to be stated or
necessary in order to make the statements not misleading under the 1933 Act, or
any other statute or the common law. The Registrant does not agree to indemnify
the Distributor or hold it harmless to the extent that the statement or omission
was made in reliance upon, and in conformity with information furnished to the
Registrant by or on behalf of the Distributor. In no case is the indemnity of
the Registrant in favor of the Distributor or any person indemnified to be
deemed to protect the Distributor or any person against any liability to the
Fund or its security holders to which the Distributor or such person would
otherwise be subject by reason of willful misfeasance, bad faith or gross
negligence in the performance of its duties or by reason of its reckless
disregard of its obligations and duties under the agreement.

     Pursuant to the agreement by which Van Kampen Investor Services Inc.
("Investor Services") is appointed transfer agent of the Fund, the Registrant
agrees to indemnify and hold Investor Services harmless against any losses,
damages, costs, charges, payments, liabilities and expenses (including
reasonable counsel fees) arising out of or attributable to:

     (1) the performance of Investor Services under the agreement provided that
Investor Services acted in good faith with due diligence and without negligence
or willful misconduct.

     (2) reliance by Investor Services on, or reasonable use by, Investor
Services of information, records and documents which have been prepared on
behalf of, or have been furnished by, the Fund, or the carrying out by Investor
Services of any instructions or requests of the Fund.

     (3) the offer or sale of the Fund's shares in violation of any federal or
state law or regulation or ruling by any federal agency unless such violation
results from any failure by Investor Services to comply with written
instructions from the Fund that such offers or sales were not permitted under
such law, rule or regulation.

     (4) the refusal of the Fund to comply with terms of the agreement or the
Fund's lack of good faith, negligence or willful misconduct or breach of any
representation or warranty made by the Fund under the agreement provided that if
the reason for such failure is attributable to any action of the Fund's
investment adviser or distributor or any person providing accounting or legal
services to the Fund, Investor Services only will be entitled to indemnification
if such entity is otherwise entitled to the indemnification from the Fund.

     See also "Investment Advisory Agreement" in the Statement of Additional
Information.

ITEM 26. BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER.

     See "Investment Advisory Services" in the Prospectus and "Trustees and
Officers" and "Investment Advisory Agreement" in the Statement of Additional
Information for information regarding the business of Van Kampen Asset
Management Inc. (the "Adviser"). For information as to the business, profession,
vocation and employment of a substantial nature of directors and officers of the
Adviser, reference is made to the Adviser's current Form ADV (File No. 801-1669)
filed under the Investment Advisers Act of 1940, as amended, incorporated herein
by reference.

ITEM 27. PRINCIPAL UNDERWRITERS.

     (a) The sole principal underwriter is Van Kampen Funds Inc. which acts as
principal underwriter for certain investment companies and unit investment
trusts. See Exhibit (z)(1).

                                       C-3
<PAGE>   67

     (b) Van Kampen Funds Inc. is an affiliated person of an affiliated person
of the Registrant and is the only principal underwriter for the Registrant. The
name, principal business address and positions and offices with Van Kampen Funds
Inc. of each of its directors and officers are disclosed in Exhibit (z)(2).
Except as disclosed under the heading, "Trustees and Officers" in Part B of this
Registration Statement, none of such persons has any position or office with
Registrant.

     (c) Not applicable.

ITEM 28. LOCATION OF ACCOUNTS AND RECORDS.


     All accounts, books and other documents of the Registrant required by
Section 31(a) of the Investment Company Act of 1940, as amended, and the Rules
thereunder to be maintained (i) by Registrant will be maintained at its offices,
located at 1 Parkview Plaza, Oakbrook Terrace, Illinois 60181-5555, or at Van
Kampen Investor Services Inc. 7501 Tiffany Springs Parkway, Kansas City,
Missouri 64153, or at the State Street Bank and Trust Company, 1776 Heritage
Drive, North Quincy, MA 02171; (ii) by the Adviser, will be maintained at its
offices, located at 1 Parkview Plaza, Oakbrook Terrace, Illinois 60181-5555; and
(iii) by Van Kampen Funds Inc., the principal underwriter, will be maintained at
its offices located at 1 Parkview Plaza, Oakbrook Terrace, Illinois 60181-5555.


ITEM 29. MANAGEMENT SERVICES.

     Not applicable.

ITEM 30. UNDERTAKINGS.

     Not applicable.

                                       C-4
<PAGE>   68

                                   SIGNATURES


     Pursuant to the requirements of the Securities Act of 1933, as amended (the
"1933 Act"), and the Investment Company Act of 1940, as amended, the Registrant,
VAN KAMPEN ENTERPRISE FUND has duly caused this Amendment to the Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized in the City of Oakbrook Terrace and State of Illinois, on the 27th
day of July, 2000.


                                      VAN KAMPEN ENTERPRISE FUND

                                      By:      /s/  A. THOMAS SMITH III
                                         ---------------------------------------
                                             A. Thomas Smith III, Secretary


     Pursuant to the requirements of the 1933 Act, this Amendment to the
Registration Statement has been signed on July 27, 2000 by the following persons
in the capacities indicated:



<TABLE>
<CAPTION>
                     SIGNATURES                                                TITLE
                     ----------                                                -----
<C>                                                         <S>

Principal Executive Officer:

             /s/ RICHARD F. POWERS, III*                    Trustee and President
-----------------------------------------------------
               Richard F. Powers, III*

Principal Financial Officer:

                /s/ JOHN L. SULLIVAN*                       Vice President, Chief Financial Officer and
-----------------------------------------------------       Treasurer
                  John L. Sullivan

Trustees:

               /s/ J. MILES BRANAGAN*                       Trustee
-----------------------------------------------------
                  J. Miles Branagan

                /s/ JERRY D. CHOATE*                        Trustee
-----------------------------------------------------
                   Jerry D. Choate

               /s/ LINDA HUTTON HEAGY*                      Trustee
-----------------------------------------------------
                 Linda Hutton Heagy

                /s/ R. CRAIG KENNEDY*                       Trustee
-----------------------------------------------------
                  R. Craig Kennedy

                 /s/ JACK E. NELSON*                        Trustee
-----------------------------------------------------
                   Jack E. Nelson

               /s/ MITCHELL M. MERIN*                       Trustee
-----------------------------------------------------
                  Mitchell M. Merin

               /s/ PHILLIP B. ROONEY*                       Trustee
-----------------------------------------------------
                  Phillip B. Rooney

                 /s/ FERNANDO SISTO*                        Trustee
-----------------------------------------------------
                   Fernando Sisto

                /s/ WAYNE W. WHALEN*                        Trustee
-----------------------------------------------------
                   Wayne W. Whalen

               /s/ SUZANNE H. WOOLSEY*                      Trustee
-----------------------------------------------------
                 Suzanne H. Woolsey
* Signed by A. Thomas Smith III pursuant to a power of attorney filed herewith.

/s/ A. THOMAS SMITH III                                     July 27, 2000
-----------------------------------------------------
                 A. Thomas Smith III
                  Attorney-in-Fact
</TABLE>



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