VAN KAMPEN EQUITY TRUST
497, 2000-10-20
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<PAGE>   1

                                   VAN KAMPEN
                            SMALL  CAP  GROWTH  FUND

Van Kampen Small Cap Growth Fund's investment objective is to seek capital
appreciation. The Fund's investment adviser seeks to achieve the Fund's
investment objective by investing primarily in common stocks and other equity
securities of small companies that the Fund's investment adviser believes have
above-average potential for capital appreciation.
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  OCTOBER 19, 2000

                            [VAN KAMPEN FUNDS LOGO]
<PAGE>   2

                               TABLE OF CONTENTS

<TABLE>
<S>                                                 <C>
Risk/Return Summary................................   3
Fees and Expenses of the Fund......................   4
Investment Objective, Policies and Risks...........   5
Investment Advisory Services.......................   9
Purchase of Shares.................................  10
Redemption of Shares...............................  16
Distributions from the Fund........................  17
Shareholder Services...............................  18
Federal Income Taxation............................  19
</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>   3

                              RISK/RETURN SUMMARY

                              INVESTMENT OBJECTIVE

The Fund's investment objective is to seek capital appreciation.

                             INVESTMENT STRATEGIES

Under normal market conditions, the Fund's investment adviser seeks to achieve
the Fund's investment objective by investing primarily in common stocks and
other equity securities of small companies that the Fund's investment adviser
believes have above-average potential for capital appreciation.

The Fund's investment adviser uses a "bottom-up" stock selection process seeking
attractive growth opportunities on an individual company basis. In selecting
securities for investment, the Fund's investment adviser seeks those companies
that it believes have rising earnings expectations and rising valuations. The
Fund generally sells securities when earnings expectations or valuations flatten
or decline. The Fund may invest up to 25% of its total assets in securities of
foreign issuers. The Fund may purchase and sell certain derivative instruments,
such as options, futures, options on futures and forward contracts, for various
portfolio management purposes.

Investment opportunities for small capitalization, growth company securities may
be more limited than those in other sectors of the market. In order to
facilitate the management of the Fund's portfolio, the Fund may from time to
time suspend the continuous offering of its shares to investors. As market
conditions permit, the Fund may reopen sales of the Fund's shares to investors.
Any such limited offerings of the Fund may commence and terminate without any
prior notice.

                                INVESTMENT RISKS

An investment in the Fund is subject to 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 and other equity securities 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 and focuses primarily on small
companies. The market values of such securities may be more volatile than other
types of investments. The returns on such securities may or may not move in
tandem with the returns on other styles of investing or the overall stock
markets. Different types of stocks tend to shift in and out of favor depending
on market and economic conditions. Thus, the value of the Fund's investments
will vary and at times may be lower or higher than that of other types of
investments. During an overall stock market decline, stock prices of small or
unseasoned companies often fluctuate more and may fall more than stock prices of
larger, more established companies. Historically, stocks of small companies have
sometimes gone through extended periods when they did not perform as well as
stocks of larger companies.

The Fund may from time to time emphasize certain sectors of the market. To the
extent the Fund invests a significant portion of its assets in securities of
companies in the same sector of the market, it is more susceptible to economic,
political, regulatory and other occurrences influencing those sectors.

RISKS OF SMALL CAPITALIZATION COMPANIES. The Fund focuses its investments on
small capitalization companies which often are newer, less established
companies. Investing in small capitalization companies involves risks not
ordinarily associated with investments in large capitalization companies. Small
capitalization companies carry additional risks because their earnings generally
tend to be less predictable, they often have limited product lines, markets,
distribution channels or financial resources and the management of such
companies may be dependent upon one or a few key people. The market movements of
equity securities of small capitalization companies may be more abrupt or
erratic than the market movements of equity securities of larger, more
established companies or the stock market in general. In addition, equity
securities of small capitalization companies generally are less liquid than
those of larger capitalization companies. This means that the Fund could have
greater difficulty selling such securities at the time and price that the Fund
would like.

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.

                                        3
<PAGE>   4

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, options on futures and forward
contracts are examples of derivative instruments. Derivative instruments involve
risks different from direct investments 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; and risks that the transactions may not be
liquid.

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
- Are willing to take on the increased risks of investing in smaller companies
  in exchange for potentially higher capital appreciation

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

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

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 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.

                            PERFORMANCE INFORMATION

As of the date of this prospectus, the Fund had not commenced investment
operations. When the Fund has completed a full calendar year of investment
operations, this section will include charts that show annual total returns,
highest and lowest quarterly returns and average total returns compared to a
benchmark index selected for the Fund. This information serves as a basis for
investors to evaluate the Fund's performance and risks by looking at how the
Fund's performance varies from year-to-year and how the Fund's performance
compares to a broad-based market index that the Fund's investment adviser
believes is an appropriate benchmark for the Fund. Past performance of the Fund
is not indicative of its future performance.

                               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 A      Class B      Class C
                       Shares       Shares       Shares
------------------------------------------------------------
<S>                    <C>          <C>          <C>     <C>
                      SHAREHOLDER FEES
         (fees paid directly from your investment)
------------------------------------------------------------
Maximum sales charge
(load) imposed on
purchases (as a
percentage of          5.75%(1)      None         None
offering price)
 ............................................................
Maximum deferred
sales charge (load)
(as a percentage of
the lesser of
original purchase
price or redemption
proceeds)              None(2)      5.00%(3)     1.00%(4)
 ............................................................
Maximum sales charge
(load) imposed on
reinvested dividends    None         None         None
 ............................................................
Redemption fee          None         None         None
 ............................................................
Exchange fee            None         None         None
 ............................................................
</TABLE>

                                        4
<PAGE>   5

<TABLE>
<CAPTION>
                       Class A      Class B      Class C
                       Shares       Shares       Shares
------------------------------------------------------------
<S>                    <C>          <C>          <C>     <C>
               ANNUAL FUND OPERATING EXPENSES
       (expenses that are deducted from Fund assets)
------------------------------------------------------------
Management fees         0.80%        0.80%        0.80%
 ............................................................
Distribution and/or
service (12b-1)
fees(5)                 0.25%        1.00%(6)     1.00%(6)
 ............................................................
Other expenses(7)       0.55%        0.55%        0.55%
 ............................................................
Total annual fund
operating expenses      1.60%        2.35%        2.35%
 ............................................................
</TABLE>

(1) Reduced for purchases of $50,000 and over. See "Purchase of Shares--Class A
    Shares."
(2) Investments of $1 million or more are not subject to any sales charge at the
    time of purchase, but a deferred sales charge of 1.00% may be imposed on
    certain redemptions made within one year of the purchase. See "Purchase of
    Shares--Class A Shares."
(3) The maximum deferred sales charge is 5.00% in the first year after purchase,
    declining thereafter as follows:
                                   Year 1-5.00%
                                   Year 2-4.00%
                                   Year 3-3.00%
                                   Year 4-2.50%
                                   Year 5-1.50%
                                    After-None
    See "Purchase of Shares--Class B Shares."
(4) The maximum deferred sales charge is 1.00% in the first year after purchase
    and 0.00% thereafter. See "Purchase of Shares--Class C Shares."
(5) Class A Shares are subject to an annual service fee of up to 0.25% of the
    average daily net assets attributable to such class of shares. Class B
    Shares and Class C Shares are each subject to a combined annual distribution
    and service fee of up to 1.00% of the average daily net assets attributable
    to such class of shares. See "Purchase of Shares."
(6) Because distribution and/or service (12b-1) fees are paid out of the Fund's
    assets on an ongoing basis, over time these fees will increase the cost of
    your investment and may cost you more than paying other types of sales
    charges.
(7) Other expenses have been estimated for the Fund's current fiscal year.

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
                                 Year      Years
-----------------------------------------------------
<S>                              <C>       <C>    <C>
Class A Shares                   $728      $1,051
 .....................................................
Class B Shares                   $738      $1,033
 .....................................................
Class C Shares                   $338        $733
 .....................................................
</TABLE>

You would pay the following expenses if you did not redeem your shares:

<TABLE>
<CAPTION>
                                 One       Three
                                 Year      Years
-----------------------------------------------------
<S>                              <C>       <C>    <C>
Class A Shares                   $728      $1,051
 .....................................................
Class B Shares                   $238        $733
 .....................................................
Class C Shares                   $238        $733
 .....................................................
</TABLE>

                             INVESTMENT OBJECTIVE,
                               POLICIES AND RISKS

The Fund's investment objective is to seek capital appreciation. Any income
received from the investment of portfolio securities is incidental to the Fund's
objective. The Fund's investment objective may be changed by the Fund's Board of
Trustees without shareholder approval, but no change is anticipated. If the
Fund's investment objective changes, the Fund will notify shareholders and
shareholders should consider whether the Fund remains an appropriate investment
in light of their then current financial position and needs. 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 primarily in common stocks and
other equity securities of small companies that the Fund's investment adviser
believes have above-average potential for capital appreciation. The Fund's
investment adviser uses a "bottom-up" disciplined style of investing that
emphasizes the analysis of individual stocks rather than economic and market
cycles. The Fund's investment adviser relies on its research capabilities and
company/analyst meetings in reviewing companies. The Fund focuses on those
companies that exhibit rising earnings expectations and rising valuations. In
selecting securities for investment, the Fund generally seeks companies that
appear to be positioned to produce an attractive level of future earnings
through the development of new products, services or markets or as a result of
changing markets or industry conditions. The Fund's investment adviser expects
that many of the companies in which the Fund invests will, at the time of
investment, be experiencing high rates of earnings growth. The securities of
such companies may trade at higher prices to earnings ratios relative to more

                                        5
<PAGE>   6

established companies and rates of earnings growth may be higher than the market
average. Stock prices of these companies may tend to be more volatile.

Under normal market conditions, the Fund invests at least 65% of its total
assets in securities of small companies at the time of investment. Under current
market conditions, the Fund's investment adviser generally defines small
companies by reference to those companies within or below the capitalization
range of companies represented in the Russell 2000 Growth Index (which consists
of companies with capitalizations up to $1.5 billion as of May 31, 2000).
Investments in such companies may offer greater opportunities for capital
appreciation than larger, more established companies, but also may involve
special risks. The securities of small companies may be subject to more abrupt
or erratic market movements and may have lower trading volumes or more erratic
trading than securities of larger-sized 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, more established
companies. Thus, the Fund may be subject to greater investment risk than that
assumed through investment in the securities of larger, more established
companies.

The companies and industries in which the Fund invests will change over time
depending on the assessment of the Fund's investment adviser of growth
opportunities. Although the Fund limits its investments to up to (but not
including) 25% of its total assets in any single industry, a significant portion
of the Fund's assets may be invested in securities of companies in the same
sector of the market. This may occur, for example, when the Fund's investment
adviser believes that several companies in the same sector each offer unusually
attractive growth opportunities. To the extent that the Fund invests a
significant portion of its assets in a limited number of market sectors, the
Fund will be more susceptible to economic, political, regulatory and other
factors influencing such sectors.

The Fund does not limit its investments to any single group or type of security.
The Fund may invest in unseasoned issuers and in securities involving special
circumstances, such as initial public offerings, companies with new management
or management reliant upon one or a few key people, special products and
techniques, limited or cyclical product lines, markets or resources, or unusual
developments, such as mergers, liquidations, bankruptcies or leveraged buyouts.
Investments in unseasoned companies, or companies with special circumstances or
unusual developments, often involve much greater risks than are inherent in
other types of investments, and securities of such companies may be more likely
to experience unexpected fluctuations in price. In addition, investments made in
anticipation of future events may, if delayed or never achieved, cause stock
prices to fall.

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. The Fund
generally sells securities when earnings expectations or valuations flatten or
decline. Other factors may include changes in the company's operations or
relative market performance, changes in the appreciation possibilities offered
by individual securities, a change in the market trend or other factors
affecting an individual security, a change in economic or market factors in
general or with respect to a particular industry, and other circumstances
bearing on the desirability of a given investment. In addition, if an individual
stock position appreciates to a point where it begins to account for a larger
percentage of the Fund's assets, the Fund's investment adviser may sell a
portion of the position held.

The Fund invests primarily 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 primarily in common stocks, the Fund may invest in other
equity securities including preferred stocks, convertible securities and rights
and warrants to purchase common or preferred stock. 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.

A convertible security is a bond, debenture, note, preferred stock or other
security that may be converted into or exchanged for a prescribed amount of
common stock or other equity security of the same

                                        6
<PAGE>   7

or a different issuer or into cash within a particular period of time at a
specified price or formula. A convertible security generally entitles the holder
to receive interest paid or accrued on debt securities or the dividend paid on
preferred stock until the convertible security matures or is redeemed, converted
or exchanged. Before conversion, convertible securities generally have
characteristics similar to both debt and equity securities. The value of
convertible securities tends to decline as interest rates rise and, because of
the conversion feature, tends to vary with fluctuations in the market value of
the underlying equity securities. Convertible securities ordinarily provide a
stream of income with generally higher yields than those of common stock of the
same or similar issuers. Convertible securities generally rank senior to common
stock in a corporation's capital structure but are usually subordinated to
comparable nonconvertible securities. Convertible securities generally do not
participate directly in any dividend increases or decreases of the underlying
equity securities although the market prices of the convertible securities may
be affected by any dividend changes or other changes in the underlying equity
securities. Rights and warrants entitle the holder to buy equity securities at a
specific price for a specific period of time. Rights typically have a
substantially shorter duration than do warrants. Rights and warrants may be
considered more speculative and less liquid than certain other types of
investments in that they do not entitle a holder to dividends or voting rights
with respect to the underlying securities nor do they represent any rights in
the assets of the issuing company. Rights and warrants may lack a secondary
market.

                             RISKS OF INVESTING IN

                         SECURITIES OF FOREIGN ISSUERS

The Fund may invest up to 25% 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 income 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. Foreign securities may not be
as liquid and may be more volatile than comparable domestic securities.

In addition, there often is 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 United States, 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 than there is in the United States, the Fund may experience
settlement difficulties or delays not usually encountered in the United States.

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.

Many European countries have adopted or are in the process of adopting a single
European currency, commonly referred to as the "euro." The long-term
consequences of the euro conversion on foreign exchange rates, interest rates
and the value of European securities, all of which may adversely affect the
Fund, are still uncertain.

                                        7
<PAGE>   8

                             DERIVATIVE INSTRUMENTS

The Fund may, but is not required to, use various investment strategic
transactions described below to earn income, facilitate portfolio management and
mitigate risks. Although the Fund's investment adviser seeks to use the
practices to further the Fund's investment objective, no assurance can be given
that the use of these practices will achieve this result.

The Fund may purchase and sell derivative instruments such as exchange-listed
and over-the-counter put and call options on securities, financial futures,
equity indices and other financial instruments, financial futures contracts and
options on futures (including but not limited to security index futures, foreign
currency exchange futures and other financial futures) and enter into various
currency transactions such as currency forward contracts, currency futures
contracts, currency swaps, or options on currencies or currency futures. In
addition, the Fund may invest in other derivative instruments that are developed
over time if their use would be consistent with the Fund's investment objective
and is approved by the Fund's Board of Trustees. Collectively, all of the above
are referred to as "Strategic Transactions."

Strategic Transactions have risks including the imperfect correlation between
the value of such instruments and the underlying assets, the possible default by
the other party to the transaction or illiquidity of the derivative instruments.
Furthermore, the ability to successfully use Strategic Transactions depends on
the ability of the Fund's investment adviser to predict pertinent market
movements, which cannot be assured. Thus, the use of Strategic Transactions may
result in losses greater than if they had not been used, may require the Fund to
sell or purchase portfolio securities at inopportune times or for prices other
than current market values, may limit the amount of appreciation the Fund can
otherwise realize on an investment, or may cause the Fund to hold a security
that it might otherwise sell. The use of currency transactions can result in the
Fund incurring losses because of the imposition of exchange controls, suspension
of settlements or the inability of the Fund to deliver or receive a specified
currency. In addition, amounts paid as premiums or cash or other assets held in
margin accounts with respect to Strategic Transactions are not otherwise
available to the Fund for investment purposes.

A more complete discussion of Strategic Transactions and their risks is
contained in the Fund's Statement of Additional Information. The Statement of
Additional Information can 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 to earn a return on
temporarily available cash. Such transactions are subject to the risk of default
by the other party.

The Fund may invest up to 15% 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.

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 Fund's portfolio turnover rate may vary from
year to year. A high portfolio turnover rate (100% or more) increases a fund's
transaction costs (including brokerage commission and dealer costs) which would
adversely impact a fund's performance. Higher portfolio turnover also may result
in the realization of more short-term capital gains than if the fund had lower
portfolio turnover. 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, on a temporary basis, hold cash or invest a
portion or all of its assets in 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 and in investment grade corporate debt securities. 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

                                        8
<PAGE>   9

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.

                          INVESTMENT ADVISORY SERVICES

THE ADVISER. Van Kampen Investment Advisory Corp. is the Fund's investment
adviser (the "Adviser" or "Advisory Corp."). The Adviser is a wholly owned
subsidiary of Van Kampen Investments Inc. ("Van Kampen Investments"). Van Kampen
Investments is a diversified asset management company that administers more than
three million retail investor accounts, has extensive capabilities for managing
institutional portfolios, and has more than $100 billion under management or
supervision as of September 30, 2000. Van Kampen Investments' more than 50
open-end funds, 38 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 the average daily net assets of
the Fund as follows:

<TABLE>
<CAPTION>
    Average Daily Net Assets  % Per Annum
---------------------------------------------
<S> <C>                       <C>         <C>
    First $500 million           0.80
 .............................................
    Next $500 million            0.75
 .............................................
    Over $1 billion              0.70
 .............................................
</TABLE>

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 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 Asset Management
Inc. ("Asset Management").

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 is managed by a team of portfolio managers.
Senior Portfolio Managers Gary M. Lewis and David Walker are the co-lead
managers of the Fund. Mr. Lewis has overall responsibility for the team of
portfolio managers which also manage the Van Kampen Emerging Growth, Van Kampen
Select Growth, Van Kampen Technology and Van Kampen Aggressive Growth Funds in
addition to this Fund. Mr. Lewis has been Senior Vice President of the Adviser
since June 1995 and of Asset Management since October 1995. Prior to that time,
Mr. Lewis was Vice President and Portfolio Manager of Asset Management. Mr.
Lewis has been primarily responsible for managing the Fund's investment
portfolio since its inception.

                                        9
<PAGE>   10

Mr. Walker has been a Senior Portfolio Manager since April 2000, and a Portfolio
Manager and Vice President of the Adviser and of Asset Management since December
1998. Mr. Walker became an Assistant Vice President of the Adviser and of Asset
Management in June 1995. Prior to April 1996, Mr. Walker was a Quantitative
Analyst of Asset Management and has worked for Asset Management since October
1990. Mr. Walker is also a portfolio manager for various unit investment trusts
managed by the Adviser or its affiliates since September 1997. Mr. Walker has
been affiliated with the Fund since its inception.

Senior Portfolio Managers Dudley Brickhouse and Janet Luby and Portfolio Manager
Matthew Hart are responsible as co-managers for the day-to-day management of the
Fund's investment portfolio.

Mr. Brickhouse has been a Senior Portfolio Manager since April 2000, and a
Portfolio Manager and Vice President of the Adviser and Asset Management since
December 1998. Mr. Brickhouse became an Associate Portfolio Manager of the
Adviser and Asset Management in September 1997. Prior to September 1997, Mr.
Brickhouse was a Vice President and Portfolio Manager with NationsBank where he
had worked since 1995. Mr. Brickhouse has been affiliated with the Fund since
its inception.

Ms. Luby has been a Senior Portfolio Manager since April 2000, and a Portfolio
Manager and Vice President of the Adviser and of Asset Management since December
1998. Ms. Luby became an Assistant Vice President of the Adviser and Asset
Management in December of 1997 and an Associate Portfolio Manager of Asset
Management in July 1995. Prior to July 1995, Ms. Luby spent eight years at AIM
Capital Management, Inc. where she worked five years in the accounting
department and three years in the investment area. Her last position in the AIM
investment area was as a senior securities analyst. Ms. Luby has also been the
portfolio manager for various unit investment trusts managed by the Adviser or
its affiliates since August 1999. Ms. Luby has been affiliated with the Fund
since its inception.

Mr. Hart has been a Portfolio Manager since January 1998 and Vice President of
the Adviser and Asset Management since December 1998. Mr. Hart became an
Associate Portfolio Manager of the Adviser and Asset Management in August 1997.
Prior to August 1997, Mr. Hart worked in various positions within the portfolio
area of AIM Capital Management, Inc., where he had worked since June 1992. Mr.
Hart's last position in the AIM portfolio area was as a convertible bonds
analyst. He has been affiliated with the Fund since its inception.

                               PURCHASE OF SHARES

                                    GENERAL

The Fund offers three classes of shares, designated as Class A Shares, Class B
Shares and Class C Shares. By offering three classes of shares, the Fund permits
each investor to choose the class of Fund shares that is most beneficial given
the amount to be invested and the length of time the investor expects to hold
the shares.

Investment opportunities for small capitalization, growth company securities may
be more limited than those in other sectors of the market. In order to
facilitate the management of the Fund's portfolio, the Fund may from time to
time suspend the continuous offering of its shares to investors. As market
conditions permit, the Fund may reopen sales of the Fund's shares to investors.
Any such limited offerings of the Fund may commence and terminate without any
prior notice.

Initial investments generally must be at least $1,000 per investor account, and
subsequent investments must be at least $25 per investor account. Minimum
investment amounts may be waived by the Distributor for certain retirement
accounts.

Each class of shares represents an interest in the same portfolio of investments
of the Fund and has the same rights except that (i) Class A Shares generally
bear the sales charge expenses at the time of purchase while Class B Shares and
Class C Shares generally bear the sales charge expenses at the time of
redemption and any expenses (including higher distribution fees and transfer
agency costs) resulting from such deferred sales charge arrangement, (ii) each
class of shares has exclusive voting rights with respect to approvals of the
Rule 12b-1 distribution plan and the service plan (each as described below)
under which the class's distribution fee and/or the service fee is paid, (iii)
each class of shares has different exchange privileges, (iv) certain classes of
shares are subject to a conversion feature and (v) certain classes of shares
have different shareholder service options available.

The offering price of the Fund's shares is based upon the Fund's net asset value
per share (plus sales

                                       10
<PAGE>   11

charges, where applicable). The net asset values per share of the Class A
Shares, Class B Shares and Class C Shares are generally expected to be
substantially the same. In certain circumstances, however, the per share net
asset values of the classes of shares may differ from one another, reflecting
the daily expense accruals of the higher distribution fees and transfer agency
costs applicable to the Class B Shares and Class C Shares and the differential
in the dividends that may be paid on each class of shares.

The net asset value per share for each class of shares of the Fund 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 a 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 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 and if there has been no sale that day, at the mean between
the last reported bid and asked prices, (ii) valuing over-the-counter securities
at the last reported sale price from the National Association of Securities
Dealer's Automated Quotations ("NASDAQ") and, if there has been no sale that
day, at the mean between the last reported bid and asked prices and (iii)
valuing unlisted securities and securities for which market quotations are not
readily available and any other assets at fair value as determined in good faith
by the Adviser in accordance with procedures established by the Fund's Board of
Trustees. Securities with remaining maturities of 60 days or less are valued at
amortized cost, which approximates market value.

The Fund has adopted a distribution plan (the "Distribution Plan") with respect
to each of its Class A Shares, Class B Shares and Class C Shares pursuant to
Rule 12b-1 under the Investment Company Act of 1940, as amended (the "1940
Act"). The Fund also has adopted a service plan (the "Service Plan") with
respect to each such class of its shares. Under the Distribution Plan and the
Service Plan, the Fund pays distribution fees in connection with the sale and
distribution of its shares and service fees in connection with provision of
ongoing services to shareholders of each such class and the maintenance of
shareholder accounts.

The amount of distribution and service fees varies among the classes offered by
the Fund. Because these fees are paid out of the Fund's assets on an ongoing
basis, these fees will increase the cost of your investment in the Fund. By
purchasing a class of shares subject to higher distribution and service fees,
you may pay more over time than on a class of shares with other types of sales
charge arrangements. Long-term shareholders may pay more than the economic
equivalent of the maximum front-end sales charges permitted by the rules of the
National Association of Securities Dealers, Inc. ("NASD"). The net income
attributable to a class of shares will be reduced by the amount of the
distribution and service fees and other expenses of the Fund associated with
that class of shares. To assist investors in comparing classes of shares, the
tables under the Prospectus heading "Fees and Expenses of the Fund" provide a
summary of sales charges and expenses and an example of the sales charges and
expenses of the Fund applicable to each class of shares offered herein.

The shares are offered on a continuous basis through the Distributor as
principal underwriter, which is located at 1 Parkview Plaza, Oakbrook Terrace,
Illinois 60181-5555. Shares may be purchased 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 form, 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 whether the purchase is for Class A Shares,
Class B Shares or Class C Shares by selecting the correct Fund name and number
on the account application form. Sales personnel of authorized dealers
distributing the Fund's shares are entitled to receive compensation for

                                       11
<PAGE>   12

selling such shares and may receive differing compensation for selling Class A
Shares, Class B Shares or Class C Shares.

The offering price for shares is based upon the next calculation of net asset
value per share (plus sales charges, where applicable) 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 determined 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. The Fund does not provide for periodic or systematic investment plans.
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 by telephone 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.

                                 CLASS A SHARES

Class A Shares of the Fund are sold at net asset value plus an initial maximum
sales charge of up to 5.75% of the offering price (or 6.10% of the net amount
invested), reduced on investments of $50,000 or more as follows:

                                 CLASS A SHARES

                             SALES CHARGE SCHEDULE

<TABLE>
<CAPTION>
                              As % of        As % of
           Size of            Offering      Net Amount
          Investment           Price         Invested
----------------------------------------------------------
<S> <C>                       <C>           <C>        <C>
    Less than $50,000          5.75%          6.10%
 ..........................................................
    $50,000 but less than
    $100,000                   4.75%          4.99%
 ..........................................................
    $100,000 but less than
    $250,000                   3.75%          3.90%
 ..........................................................
    $250,000 but less than
    $500,000                   2.75%          2.83%
 ..........................................................
    $500,000 but less than
    $1,000,000                 2.00%          2.04%
 ..........................................................
    $1,000,000 or more           *              *
 ..........................................................
</TABLE>

* No sales charge is payable at the time of purchase on investments of $1
  million or more, although for such investments the Fund may impose a
  contingent deferred sales charge of 1.00% on certain redemptions made within
  one year of the purchase. 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.

No sales charge is imposed on Class A Shares received from reinvestment of
dividends or capital gain dividends.

Under the Distribution Plan and the Service Plan, the Fund may spend up to a
total of 0.25% per year of the Fund's average daily net assets with respect to
Class A Shares of the Fund. From such amount, under the Service Plan, the Fund
may spend up to 0.25% per year of the Fund's average daily net assets with
respect to Class A Shares of the Fund.

                                       12
<PAGE>   13

                                 CLASS B SHARES

Class B Shares of the Fund are sold at net asset value and are subject to a
contingent deferred sales charge if redeemed within five years of purchase as
shown in the table as follows:

                                 CLASS B SHARES

                             SALES CHARGE SCHEDULE

<TABLE>
<CAPTION>
                         Contingent Deferred
                            Sales Charge
                         as a Percentage of
                            Dollar Amount
    Year Since Purchase   Subject to Charge
------------------------------------------------
<S> <C>                  <C>                 <C>
    First                       5.00%
 ................................................
    Second                      4.00%
 ................................................
    Third                       3.00%
 ................................................
    Fourth                      2.50%
 ................................................
    Fifth                       1.50%
 ................................................
    Sixth and After             None
 ................................................
</TABLE>

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 gain dividends. It
is presently the policy of the Distributor not to accept any order for Class B
Shares in an amount of $500,000 or more because it ordinarily will be more
advantageous for an investor making such an investment to purchase Class A
Shares.

The amount of the contingent deferred sales charge, if any, varies depending on
the number of years from the time of payment for each purchase of Class B Shares
until the time of redemption of such shares.

In determining whether a contingent deferred sales charge applies to a
redemption, it is assumed that the shares being redeemed first are any shares in
the shareholder's Fund account that are not subject to a contingent deferred
sales charge, followed by shares held the longest in the shareholder's account.

Under the Distribution Plan, the Fund may spend up to 0.75% per year of the
Fund's average daily net assets with respect to Class B Shares of the Fund. In
addition, under the Service Plan, the Fund may spend up to 0.25% per year of the
Fund's average daily net assets with respect to Class B Shares of the Fund.

                                 CLASS C SHARES

Class C Shares of the Fund are sold at net asset value and are subject to a
contingent deferred sales charge of 1.00% of the dollar amount subject to charge
if redeemed within one year of purchase.

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 gain dividends. It
is presently the policy of the Distributor not to accept any order for Class C
Shares in an amount of $1 million or more because it ordinarily will be more
advantageous for an investor making such an investment to purchase Class A
Shares.

In determining whether a contingent deferred sales charge applies to a
redemption, it is assumed that the shares being redeemed first are any shares in
the shareholder's Fund account that are not subject to a contingent deferred
sales charge, followed by shares held the longest in the shareholder's account.

Under the Distribution Plan, the Fund may spend up to 0.75% per year of the
Fund's average daily net assets with respect to Class C Shares of the Fund. In
addition, under the Service Plan, the Fund may spend up to 0.25% per year of the
Fund's average daily net assets with respect to Class C Shares of the Fund.

                               CONVERSION FEATURE

Class B Shares, including Class B Shares received from reinvestment of dividends
through the dividend reinvestment plan, automatically convert to Class A Shares
eight years after the end of the calendar month in which the shares were
purchased. Such conversion will be on the basis of the relative net asset values
per share, without the imposition of any sales load, fee or other charge. The
conversion schedule applicable to a share of the Fund acquired through the
exchange privilege from another Van Kampen fund participating in the exchange
program is determined by reference to the Van Kampen fund from which such share
was originally purchased.

The conversion of such shares to Class A Shares is subject to the continuing
availability of an opinion of counsel to the effect that (i) the assessment of
the higher distribution fee and transfer agency costs with respect to such
shares does not result in the Fund's

                                       13
<PAGE>   14

dividends or capital gain dividends constituting "preferential dividends" under
the federal income tax law and (ii) the conversion of shares does not constitute
a taxable event under federal income tax law. The conversion may be suspended if
such an opinion is no longer available and such shares might continue to be
subject to the higher aggregate fees applicable to such shares for an indefinite
period.

                   WAIVER OF CONTINGENT DEFERRED SALES CHARGE

The contingent deferred sales charge is waived on redemptions of Class B Shares
and Class C Shares (i) within one year following the death or disability (as
disability is defined by federal income tax law) of a shareholder, (ii) for
required minimum distributions from an individual retirement account ("IRA") or
certain other retirement plan distributions, (iii) for withdrawals under the
Fund's systematic withdrawal plan but limited to 12% annually of the initial
value of the account, (iv) if no commission or transaction fee is paid to
authorized dealers at the time of purchase of such shares and (v) if made by the
Fund's involuntary liquidation of a shareholder's account as described under the
Prospectus heading "Redemption of Shares." Subject to certain limitations, a
shareholder who has redeemed Class C Shares of the Fund may reinvest in Class C
Shares at net asset value with credit for any contingent deferred sales charge
if the reinvestment is made within 180 days after the redemption provided that
shares of the Fund are available for sale at the time of such reinvestment. For
a more complete description of contingent deferred sales charge waivers, please
refer to the Fund's Statement of Additional Information or contact your
authorized dealer.

                               QUANTITY DISCOUNTS

Investors purchasing Class A Shares may, under certain circumstances described
below, be entitled to pay reduced or no sales charges. Investors, or their
authorized dealers, must notify the Fund at the time of the purchase order
whenever a quantity discount is applicable to purchases. Upon such notification,
an investor will pay the lowest applicable sales charge. Quantity discounts may
be modified or terminated at any time. For more information about quantity
discounts, investors should contact their authorized dealer or the Distributor.

A person eligible for a reduced sales charge includes an individual, his or her
spouse and children under 21 years of age and any corporation, partnership or
sole proprietorship which is 100% owned, either alone or in combination, by any
of the foregoing; a trustee or other fiduciary purchasing for a single trust or
for a single fiduciary account, or a "company" as defined in Section 2(a)(8) of
the 1940 Act.

As used herein, "Participating Funds" refers to certain open-end investment
companies advised by Asset Management or Advisory Corp. and distributed by the
Distributor as determined from time to time by the Fund's Board of Trustees.

VOLUME DISCOUNTS. The size of investment shown in the Class A Shares sales
charge table applies to the total dollar amount being invested by any person in
shares of the Fund, or in any combination of shares of the Fund and shares of
other Participating Funds, although other Participating Funds may have different
sales charges.

CUMULATIVE PURCHASE DISCOUNT. The size of investment shown in the Class A Shares
sales charge table may also be determined by combining the amount being invested
in shares of the Participating Funds plus the current offering price of all
shares of the Participating Funds currently owned.

LETTER OF INTENT. A Letter of Intent provides an opportunity for an investor to
obtain a reduced sales charge by aggregating investments over a 13-month period
to determine the sales charge as outlined in the Class A Shares sales charge
table. The size of investment shown in the Class A Shares sales charge table
includes purchases of shares of the Participating Funds over a 13-month period
based on the total amount of intended purchases plus the value of all shares of
the Participating Funds previously purchased and still owned. An investor may
elect to compute the 13-month period starting up to 90 days before the date of
execution of a Letter of Intent. Each investment made during the period receives
the reduced sales charge applicable to the total amount of the investment goal.
The Letter of Intent does not preclude the Fund (or any other Participating
Fund) from discontinuing the sale of its shares. The initial purchase must be
for an amount equal to at least 5% of the minimum total purchase amount of the
level selected. If trades not initially made under a Letter of Intent
subsequently qualify for a lower sales charge through the 90-day backdating
provisions, an adjustment will be made at the expiration of the Letter of Intent
to give effect to the lower sales charge. Such adjustment in sales charge will
be used to purchase additional shares. The Fund initially will escrow shares
totaling 5% of the dollar amount of the Letter of Intent to be held by Investor
Services in the name

                                       14
<PAGE>   15

of the shareholder. In the event the Letter of Intent goal is not achieved
within the specified period, the investor must pay the difference between the
sales charge applicable to the purchases made and the reduced sales charges
previously paid. Such payments may be made directly to the Distributor or, if
not paid, the Distributor will liquidate sufficient escrowed shares to obtain
the difference.

                            OTHER PURCHASE PROGRAMS

Purchasers of Class A Shares may be entitled to reduced or no initial sales
charges in connection with purchases by registered representatives of selling
firms or purchases by persons affiliated with the Fund or the Distributor. The
Fund reserves the right to modify or terminate these arrangements at any time.

NET ASSET VALUE PURCHASE OPTIONS. Class A Shares of the Fund may be purchased at
net asset value, generally upon written assurance that the purchase is made for
investment purposes and that the shares will not be resold except through
redemption by the Fund, by:

(1) Current or retired trustees or directors of funds advised by Morgan Stanley
    Dean Witter & Co. and any of its subsidiaries and such persons' families and
    their beneficial accounts.

(2) Current or retired directors, officers and employees of Morgan Stanley Dean
    Witter & Co. and any of its subsidiaries; employees of an investment
    subadviser to any fund described in (1) above or an affiliate of such
    subadviser; and such persons' families and their beneficial accounts.

(3) Directors, officers, employees and, when permitted, registered
    representatives, of financial institutions that have a selling group
    agreement with the Distributor and their spouses and children under 21 years
    of age when purchasing for any accounts they beneficially own, or, in the
    case of any such financial institution, when purchasing for retirement plans
    for such institution's employees; provided that such purchases are otherwise
    permitted by such institutions.

(4) Registered investment advisers who charge a fee for their services, trust
    companies and bank trust departments investing on their own behalf or on
    behalf of their clients. The Distributor may pay authorized dealers through
    which purchases are made an amount up to 0.50% of the amount invested, over
    a 12-month period.

(5) Beneficial owners of shares of Participating Funds held by a retirement plan
    or held in a tax-advantaged retirement account who purchase shares of the
    Fund with proceeds from distributions from such a plan or retirement account
    other than distributions taken to correct an excess contribution.

(6) Accounts as to which a bank or broker-dealer charges an account management
    fee ("wrap accounts"), provided the bank or broker-dealer has a separate
    agreement with the Distributor.

(7) Individuals who are members of a "qualified group." For this purpose, a
    qualified group is one which (i) has been in existence for more than six
    months, (ii) has a purpose other than to acquire shares of the Fund or
    similar investments, (iii) has given and continues to give its endorsement
    or authorization, on behalf of the group, for purchase of shares of the Fund
    and Participating Funds, (iv) has a membership that the authorized dealer
    can certify as to the group's members and (v) satisfies other uniform
    criteria established by the Distributor for the purpose of realizing
    economies of scale in distributing such shares. A qualified group does not
    include one whose sole organizational nexus, for example, is that its
    participants are credit card holders of the same institution, policy holders
    of an insurance company, customers of a bank or broker-dealer, clients of an
    investment adviser or other similar groups. Shares purchased in each group's
    participants account in connection with this privilege will be subject to a
    contingent deferred sales charge of 1.00% in the event of redemption within
    one year of purchase, and a commission will be paid to authorized dealers
    who initiate and are responsible for such sales to each individual 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.

The term "families" includes a person's spouse, children and grandchildren under
21 years of age, parents, and a person's spouse's parents.

Purchase orders made pursuant to clause (4) may be placed either through
authorized dealers as described above or directly with Investor Services by the
investment adviser, trust company or bank trust

                                       15
<PAGE>   16

department, provided that Investor Services receives federal funds for the
purchase by the close of business on the next business day following acceptance
of the order. An authorized dealer may charge a transaction fee for placing an
order to purchase shares pursuant to this provision or for placing a redemption
order with respect to such shares. Authorized dealers will be paid a service fee
as described above on purchases made under options (3) through (7) above. The
Fund may terminate, or amend the terms of, offering shares of the Fund at net
asset value to such groups at any time.

                                 REDEMPTION OF
                                     SHARES

Generally shareholders may redeem for cash some or all of their shares without
charge by the Fund (other than applicable sales charge) at any time. As
described under the Prospectus heading "Purchase of Shares," redemptions of
Class B Shares and Class C Shares may be subject to a contingent deferred sales
charge. In addition, certain redemptions of Class A Shares for shareholder
accounts of $1 million or more may be subject to a contingent deferred sales
charge. 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 redemption 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 the purchase check has cleared, which may
take up to 15 days from the date of purchase. A taxable gain or loss may be
recognized by the shareholder upon redemption of shares. Certificated shares
must be properly endorsed for transfer and must accompany a written redemption
request.

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 $100,000, 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 15 days, signature(s) must be guaranteed by one of
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, additional documents may be necessary. Certificated
shares may be redeemed only by written request. The certificates for the shares
being redeemed must be properly endorsed for transfer and must accompany the
written redemption request. Generally, in the event a redemption is requested by
and registered to a corporation, partnership, trust, fiduciary, estate or other
legal entity owning shares of the Fund, a copy of the corporate resolution or
other legal documentation appointing the authorized signer and certified within
the prior 120 days must accompany the redemption request. Retirement plan
distribution requests should be sent to the plan custodian/trustee to be
forwarded to Investor Services. Contact the plan custodian/trustee for further
information.

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

                                       16
<PAGE>   17

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 telephone through FundInfo(R)
(automated telephone system) which is generally 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 15 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.

                          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 this net investment income at least
annually as dividends to shareholders. Dividends are automatically applied to
purchase additional shares of

                                       17
<PAGE>   18

the Fund at the next determined net asset value unless the shareholder instructs
otherwise.
The per share dividends on Class B Shares and Class C Shares may be lower than
the per share dividends on Class A Shares as a result of the higher distribution
fees and transfer agency costs applicable to such classes of shares.

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 net capital gains
as capital gain dividends 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 Fund's Statement of Additional Information or contact your
authorized dealer.

INTERNET TRANSACTIONS. In addition to performing transactions on your account
through written instruction or by telephone, you may also perform certain
transactions through the internet. Please refer to our web site at
www.vankampen.com for further instructions regarding internet transactions. 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 through the internet are genuine. Such procedures
include requiring use of a personal identification number prior to acting upon
internet instructions and providing written confirmation of instructions
communicated through the internet. If reasonable procedures are employed, none
of Van Kampen Investments, Investor Services or the Fund will be liable for
following instructions received through the internet which it reasonably
believes to be genuine. If an account has multiple owners, Investor Services may
rely on the instructions of any one owner.

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 (without sales
charge) on the applicable payable date of the dividend or capital gain dividend.
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 account application form 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.

EXCHANGE PRIVILEGE. Shares of the Fund may be exchanged for shares of the same
class of any Participating Fund based on the next determined 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 an authorized dealer or the Distributor.

To be eligible for exchange, shares of the Fund must have been registered in the
shareholder's name for at least 30 days prior to an exchange. Shares of the Fund
registered in a shareholder's name for less than 30 days may only be exchanged
upon receipt of prior approval of the Adviser. It is the policy of the Adviser,
under normal circumstances, not to approve such requests.

When shares that are subject to a contingent deferred sales charge are exchanged
among Participating Funds, the holding period for purposes of computing the
contingent deferred sales charge is based upon the date of the initial purchase
of such shares from a Participating Fund. When such shares are redeemed and not
exchanged for shares of another Participating Fund, the shares are subject to
the contingent deferred sales charge schedule imposed by the Participating Fund
from which such shares were originally purchased.

                                       18
<PAGE>   19

Exchanges of shares are sales of shares of one Participating Fund and purchases
of shares of another Participating Fund. The sale may result in a gain or loss
for federal income tax purposes. If the shares sold have been held for less than
91 days, the sales charge paid on such shares is carried over and included in
the tax basis of the shares acquired.

A shareholder wishing to make an exchange may do so by sending a written request
to Investor Services, by contacting the telephone transaction line at (800)
421-5684, through FundInfo(R) (automated telephone system) at (800) 847-2424 or
through the internet at www.vankampen.com. A shareholder automatically has these
exchange privileges unless the shareholder indicates otherwise by checking the
applicable box on the account application form. 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. 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 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.

For purposes of determining the sales charge rate previously paid on Class A
Shares, all sales charges paid on the exchanged security and on any security
previously exchanged for such security or for any of its predecessors shall be
included. If the exchanged security was acquired through reinvestment, that
security is deemed to have been sold with a sales charge rate equal to the rate
previously paid on the security on which the dividend or distribution was paid.
If a shareholder exchanges less than all of such shareholder's securities, the
security upon which the highest sales charge rate was previously paid is deemed
exchanged first.

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,
plus any applicable sales charge, next determined on the date of receipt.
Exchange requests received on a business day after the time that 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 (generally
ordinary 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

                                       19
<PAGE>   20

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 a 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 by the
shareholder 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 non-resident 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 set forth 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
of the Fund, as well as the effects of state, local and foreign tax law and any
proposed tax law changes.

                                       20
<PAGE>   21

                               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*
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

TELECOMMUNICATIONS DEVICE FOR THE DEAF
For shareholder and dealer inquiries through Telecommunications Device for the
Deaf (TDD), call (800) 421-2833

FUNDINFO(R)
For automated telephone services, call (800) 847-2424

WEB SITE
www.vankampen.com

VAN KAMPEN SMALL CAP GROWTH FUND
1 Parkview Plaza
PO Box 5555
Oakbrook Terrace, IL 60181-5555

Investment Adviser
VAN KAMPEN INVESTMENT ADVISORY CORP.
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 Small Cap Growth Fund

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

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

Independent Auditors
ERNST & YOUNG LLP
233 South Wacker Drive
Chicago, IL 60606
<PAGE>   22

                             VAN KAMPEN  SMALL  CAP
                                  GROWTH  FUND

                                   PROSPECTUS
                                OCTOBER 19, 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 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 811-4805.
                                                                        SCGO PRO
10/00


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