VAN KAMPEN EQUITY TRUST
497, 2000-06-02
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<PAGE>   1

                                   VAN KAMPEN
                            AGGRESSIVE  GROWTH  FUND

Van Kampen Aggressive Growth Fund is a mutual fund with an investment objective
to seek capital growth. The Fund's management seeks to achieve the investment
objective by investing primarily in common stocks and other equity securities of
small- and medium-sized growth companies.
Shares of the Fund have not been approved or disapproved by the Securities and
Exchange Commission (SEC) or any state regulators, 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  JULY 29, 1999,
                        AS SUPPLEMENTED ON JUNE 2, 2000

                            [VAN KAMPEN FUNDS LOGO]
<PAGE>   2

                               TABLE OF CONTENTS

<TABLE>
<S>                                                 <C>
Risk/Return Summary................................   3
Fees and Expenses of the Fund......................   5
Investment Objective, Policies and Risks...........   6
Investment Advisory Services.......................  11
Purchase of Shares.................................  12
Redemption of Shares...............................  18
Distributions from the Fund........................  20
Shareholder Services...............................  20
Federal Income Taxation............................  22
Financial Highlights...............................  24
</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 is a mutual fund with an investment objective to seek capital growth.
Any income received from the investment of portfolio securities is incidental to
the Fund's investment objective.

                             INVESTMENT STRATEGIES

Under normal market conditions, the Fund's management seeks to achieve the
investment objective by investing at least 65% of the Fund's total assets in
common stocks or other equity securities of companies that the Fund's investment
adviser believes have an above-average potential for capital growth. The Fund's
management uses a "bottom-up" approach to stock selection focusing on those
companies that exhibit rising earnings expectations and rising valuations. The
Fund focuses primarily on equity securities of small- and medium-sized
companies, although the Fund may invest in securities of larger-sized companies
that the Fund's investment adviser believes have an above-average potential for
capital growth. The Fund may invest up to 20% of its total assets in securities
of foreign issuers. The Fund may invest in certain derivatives, such as options
and futures, which may subject the Fund to additional risks.

                                INVESTMENT RISKS

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

MARKET RISK. Market risk is the possibility that the market values of securities
owned by the Fund will decline. Market risk may affect a single issuer,
industry, sector of the economy, or the market as a whole. Investments in common
stocks and other equity securities generally are affected by changes in the
stock markets, which fluctuate substantially over time, sometimes suddenly and
sharply. 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. The Fund emphasizes a "growth" style of investing and focuses
primarily on small- and medium-sized 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. During an overall market decline,
stock prices of small- and medium-sized companies often fluctuate more and may
fall more than prices of larger-sized, more established companies. It is
possible that the stocks of small- and medium-sized companies will be more
volatile and underperform the overall stock market. Historically, stocks of
small- and medium-sized companies have sometimes gone through extended periods
when they did not perform as well as stocks of larger-sized 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 AGGRESSIVE GROWTH STOCKS. Companies that the Fund's management believes
have significant growth potential are often companies with new, limited or
cyclical product lines, markets or financial resources and the management of
such companies may be dependent upon one or a few key people. The stocks of such
companies can therefore be subject to more abrupt or erratic market movements
than stocks of larger, more established companies or the stock market in
general.

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

RISKS OF USING DERIVATIVE INVESTMENTS. In general terms, a derivative investment
is one whose value depends on (or is derived from) the value of an underlying
asset, interest rate or index. Options and futures are examples of derivatives.
Derivative investments involve risks different from direct investment in
underlying securities such as 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 incur losses that
partially or completely offset gains in portfolio positions; risks that the
transactions may not be liquid; and manager risk.

                                        3
<PAGE>   4

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

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

                                INVESTOR PROFILE

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

- Seek capital growth over the long term.

- Do not seek current income from their investment.

- Are willing to take on the increased risks of investing in smaller- and
  medium-sized companies in exchange for potentially higher capital growth.

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

- Wish to add to their personal investment portfolio a fund that invests
  primarily in common stocks of smaller- and medium-sized growth companies.

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.

                               ANNUAL PERFORMANCE

One way to measure the risks of investing in the Fund is to look at how its
performance varies from year to year. The following chart shows the annual
returns of the Fund's Class A Shares over the past two calendar years prior to
the date of this prospectus. Sales loads are not reflected in this chart. If
these sales loads had been included, the returns shown below would have been
lower. Remember that the past performance of the Fund is not indicative of its
future performance.

<TABLE>
<CAPTION>
                                                                             ANNUAL RETURN
                                                                             -------------
<S>                                                           <C>
'1997'                                                                           13.67
'1998'                                                                            35.4
</TABLE>


The annual return variability of the Fund's Class B Shares and Class C Shares
would be substantially similar to that shown for the Class A Shares because all
of the Fund's shares are invested in the same portfolio of securities; however,
the actual annual returns of the Class B Shares and Class C Shares would be
lower than the annual returns shown for the Fund's Class A Shares because of
differences in the expenses borne by each class of shares.

During the two-year period shown in the bar chart, the highest quarterly return
was 32.72% (for the quarter ended December 31, 1998) and the lowest quarterly
return was -19.16% (for the quarter ended March 31, 1997).

                                        4
<PAGE>   5

                            COMPARATIVE PERFORMANCE

As a basis for evaluating the Fund's performance and risks, the table below
shows how the Fund's performance compares with three broad-based market indices:
the Standard & Poor's 500-Stock Index* (an index of 500 widely held U.S. common
stocks), the Russell 2000 Stock Index** (a small capitalization company index),
and the Russell 2500 Growth Index** (a small-capitalization index of companies
in the Russell 2500 Index** with higher price-to-book ratios and higher
forecasted growth values). The Fund's performance figures include the maximum
sales charges paid by investors. The indices' performance figures do not include
commissions or sales charges that would be paid by investors purchasing the
securities represented by those indices. Average annual total returns are shown
for the periods ended December 31, 1998 (the most recently completed calendar
year prior to the date of this prospectus). Remember that the past performance
of the Fund is not indicative of its future performance.

<TABLE>
<CAPTION>
            Average Annual
            Total Returns
               for the
            Periods Ended            Past      Since
          December 31, 1998         1 Year   Inception
----------------------------------------------------------
<S> <C>                             <C>      <C>       <C>
    Van Kampen Aggressive
    Growth Fund--Class A Shares     27.67%    20.90%(1)
    Standard & Poor's
    500-Stock Index                 28.58%    28.83%(2)
    Russell 2000 Stock Index         1.23%     2.39%(2)
    Russell 2500 Growth Index        3.07%     6.52%(2)
 ..........................................................
    Van Kampen Aggressive Growth
    Fund--Class B Shares            29.42%    19.99%(1)
    Standard & Poor's
    500-Stock Index                 28.58%    28.83%(2)
    Russell 2000 Stock Index         1.23%     2.39%(2)
    Russell 2500 Growth Index        3.07%     6.52%(2)
 ..........................................................
    Van Kampen Aggressive Growth
    Fund--Class C Shares            33.48%    20.05%(1)
    Standard & Poor's
    500-Stock Index                 28.58%    28.83%(2)
    Russell 2000 Stock Index         1.23%     2.39%(2)
    Russell 2500 Growth Index        3.07%     6.52%(2)
 ..........................................................
</TABLE>

Inception dates: (1) 5/29/96, (2) 5/31/96.

 *The Standard & Poor's 500-Stock Index is a broad-based index that reflects the
  general performance of the U.S. stock market and was initially selected as a
  benchmark for the Fund's performance. Based on the Fund's asset composition,
  management believes the Russell 2500 Growth Stock Index provides a more
  accurate narrow-based benchmark for the Fund. The Standard & Poor's 500 Stock
  Index will not be shown in future reports.

**The Russell 2000 Stock Index, the Russell 2500 Growth Index and the Russell
  2500 Index are subsets of the Russell 3000 Index, an index of the 3000 largest
  U.S. companies based on total market capitalization, which represents
  approximately 98% of the investable U.S. equity market.

                               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.

                                SHAREHOLDER FEES

                   (fees paid directly from your investment)

<TABLE>
<CAPTION>
                       Class A      Class B      Class C
                       Shares       Shares       Shares
------------------------------------------------------------
<S>                    <C>          <C>          <C>     <C>
Maximum sales charge
(load) imposed on
purchases (as a        5.75%(1)      None         None
percentage of
offering price)
 ............................................................
Maximum deferred
sales charge (load)
(as a percentage of
the lesser of
original purchase
price or redemption    None(2)      5.00%(3)     1.00%(4)
proceeds)
 ............................................................
Maximum sales charge
(load) imposed on
reinvested dividends
(as a percentage of     None         None         None
offering price)
 ............................................................
Redemption fees (as a
percentage of amount    None         None         None
redeemed)
 ............................................................
Exchange fee            None         None         None
 ............................................................
</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
    and 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
<PAGE>   6

                                  ANNUAL FUND

                               OPERATING EXPENSES

                 (expenses that are deducted from Fund assets)

<TABLE>
<CAPTION>
                         Class A      Class B      Class C
                         Shares       Shares       Shares
--------------------------------------------------------------
<S>                      <C>          <C>          <C>     <C>
Management Fees           0.75%        0.75%        0.75%
 ..............................................................
Distribution and/or
Service (12b-1)           0.25%       1.00%(2)     1.00%(2)
Fees(1)
 ..............................................................
Other Expenses            0.56%        0.58%        0.58%
 ..............................................................
Total Annual Fund
Operating Expenses        1.56%        2.33%        2.33%
 ..............................................................
</TABLE>

(1) 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."
(2) 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.

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% annual return each year and
that the Fund's operating expenses remain the same each year (except for the
ten-year amounts for Class B Shares which reflect the conversion of Class B
Shares to Class A Shares after eight years). Although your actual costs may be
higher or lower, based on these assumptions your costs would be:

<TABLE>
<CAPTION>
                           One       Three        Five        Ten
                           Year      Years       Years       Years
-----------------------------------------------------------------------
<S>                        <C>       <C>         <C>         <C>    <C>
Class A Shares             $725      $1,039      $1,376      $2,325
 .......................................................................
Class B Shares             $736      $1,027      $1,395      $2,474*
 .......................................................................
Class C Shares             $336       $ 727      $1,245      $2,666
 .......................................................................
</TABLE>

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

<TABLE>
<CAPTION>
                           One       Three        Five        Ten
                           Year      Years       Years       Years
-----------------------------------------------------------------------
<S>                        <C>       <C>         <C>         <C>    <C>
Class A Shares             $725      $1,039      $1,376      $2,325
 .......................................................................
Class B Shares             $236      $  727      $1,245      $2,474*
 .......................................................................
Class C Shares             $236      $  727      $1,245      $2,666
 .......................................................................
</TABLE>

* Based on conversion to Class A Shares after eight years.

                             INVESTMENT OBJECTIVE,
                               POLICIES AND RISKS

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

Under normal market conditions, the Fund's investment adviser seeks to achieve
the investment objective by investing at least 65% of the Fund's total assets in
common stocks or other equity securities that the Fund's investment adviser
believes have an above-average potential for capital growth. In selecting
securities for investment, the Fund focuses primarily on equity securities of
small- and medium-sized companies, although the Fund may invest its assets in
securities of larger-sized companies that the Adviser believes have an above-
average potential for capital growth. Under current market conditions, the
Fund's investment adviser generally defines small-and medium-sized companies by
reference to those companies within or below the capitalization range of
companies represented in the Standard & Poor's MidCap 400 Index (which consists
of companies in the capitalization range of approximately $244 million to $22
billion as of June 30, 1999). Investments in such companies may offer greater
opportunities for capital growth than larger, more established companies, but
also may involve special risks. The Fund's investment adviser uses a "bottom-up"
investment approach seeking attractive growth opportunities on

                                        6
<PAGE>   7

an individual company basis. The Fund may invest in securities that have
above-average volatility of price movement. Because prices of common stocks and
other equity securities fluctuate, the value of an investment in the Fund will
vary based upon the Fund's investment performance.

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
preferred stocks and securities convertible into common stocks or other equity
securities. 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, warrant or other security that may be converted into or
exchanged for a prescribed amount of common stock or other equity security of
the same or a different issuer 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 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 in the underlying equity security although the
market prices of convertible securities may be affected by any such dividend
changes or other changes in the underlying security. Generally, warrants are
securities that may be exchanged for a prescribed amount of common stock or
other equity security of the issuer within a particular period of time at a
specified price or in accordance with a specified formula. Warrants do not carry
with them the right to dividends and they do not represent any rights in the
assets of the issuer. As a result, any such investments may be considered to be
more speculative than most other types of equity investments.

The Fund also may invest in debt securities of various maturities considered
"investment grade" at the time of investment. A subsequent reduction in rating
does not require the Fund to dispose of a security. Investment grade securities
are securities rated BBB or higher by Standard & Poor's ("S&P") or rated Baa or
higher by Moody's Investors Service, Inc. ("Moody's") or comparably rated by any
other nationally recognized statistical rating organization or, if unrated, are
considered by the Fund's investment adviser to be of comparable quality.
Securities rated BBB by S&P or Baa by Moody's are in the lowest of the four
investment grade categories and are considered by the rating agencies to be
medium-grade obligations which possess speculative characteristics so that
changes in economic conditions or other circumstances are more likely to lead to
a weakened capacity to make principal and interest payments than in the case of
higher-rated securities. The market prices of debt securities generally
fluctuate inversely with changes in interest rates so that the value of
investments in such securities can be expected to decrease as interest rates
rise and increase as interest rates fall.

The Fund's primary approach is to seek what the Fund's investment adviser
believes to be attractive growth opportunities on an individual company basis.
The Fund's investment adviser uses a "bottom-up" disciplined style of investing.
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

                                        7
<PAGE>   8

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.

The companies and industries in which the Fund invests will change over time
depending on the Fund's investment adviser's assessment of growth opportunities.
Although the Fund will limit its investments to 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
situations or unusual developments, such as initial public offerings, new
management or management reliant on one or a few key people, special products
and techniques, limited or cyclical product lines, markets or resources,
mergers, liquidations or leveraged buyouts. Investments in unseasoned companies
and special situations often involve much greater risks than are inherent in
other types of investments because 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.

Although the Fund may invest in companies of any size, the Fund focuses
primarily on small- and medium-sized companies. The securities of small- or
medium-sized 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-sized, more established companies. Thus, the
Fund may be subject to greater investment risk than that assumed through
investment in the securities of larger-sized, more established companies. In
periods of increased market volatility, the Fund may invest a greater portion of
its assets in the equity securities of larger-sized companies.

The Fund may dispose of a security whenever, in the opinion of the Fund's
investment adviser, factors indicate it is desirable to do so. The Fund
generally sells securities when earnings expectations or valuations flatten or
decline. Other factors may include changes in the company's fundamentals or
relative market performance or 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.

                             RISKS OF INVESTING IN

                         SECURITIES OF FOREIGN ISSUERS

The Fund may invest up to 20% of its total assets in securities of foreign
issuers. Such securities 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 and
economic 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
translation costs) and difficulty in enforcing contractual obligations or taking
judicial action. 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, financial reporting
and disclosure requirements than domestic issuers. Such securities may be less
liquid than the securities of domestic issuers. Such securities may also be
subject to greater fluctuations in price than securities of domestic issuers.
There is generally less government regulation of stock exchanges, brokers and
listed companies abroad than in the U. S., and, with respect to certain foreign
countries, there is a possibility of expropriation or confiscatory taxation, or
diplomatic

                                        8
<PAGE>   9

developments which could affect investment in those countries. Because there is
usually less supervision and governmental regulation of exchanges, brokers and
dealers than there is in the U.S., the Fund may experience settlement
difficulties or delays not usually encountered in the U.S. The risks of foreign
investments should be considered carefully by an investor in the Fund.

                             STRATEGIC TRANSACTIONS

The Fund may, but is not required to, use various investment strategic
transactions described below to facilitate portfolio management and mitigate
risks. Such strategic transactions are generally accepted under modern portfolio
management and are regularly used by many mutual funds and other institutional
investors. Although the investment adviser seeks to use the practices to further
the Fund's investment objective, no assurance can be given that 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 and fixed-income indices and other financial instruments, purchase and
sell financial futures contracts and options thereon, and enter into various
currency transactions such as currency forward contracts, currency futures
contracts, currency swaps, or options on currencies or currency futures.
Collectively, all of the above are referred to as "Strategic Transactions." The
Fund generally seeks to use Strategic Transactions as a portfolio management or
hedging technique to seek to protect against possible adverse changes in the
market value of securities held in or to be purchased for the Fund's portfolio,
protect the Fund's unrealized gains, facilitate the sale of certain securities
for investment purposes, protect against changes in currency exchange rates, or
establish positions in the derivatives markets as a temporary substitute for
purchasing or selling particular securities.

Strategic Transactions have risks including the imperfect correlation between
the value of such instruments and the underlying assets, the possible default of
the other party to the transaction or illiquidity of the derivative instrument.
Furthermore, the ability to successfully use Strategic Transactions depends on
the Fund's investment adviser's ability 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. Additionally, amounts paid as premiums and 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 which 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
banks and broker-dealers to earn a return on temporarily available cash. Such
transactions are subject to the risk of default by the other party. It is
currently the policy of the Fund not to invest more than 25% of its total assets
at the time of purchase in securities subject to repurchase agreements.

The Fund may purchase and sell securities on a "when-issued" and "delayed
delivery" basis. The Fund accrues no income on such securities until the Fund
actually takes delivery of such securities. These transactions are subject to
market fluctuation; the value of the securities at delivery may be more or less
than their purchase price. The value or yield generally available on comparable
securities when delivery occurs may be higher than the value or yield on the
securities obtained pursuant to such transactions. Because the Fund relies on
the buyer or seller to consummate the transaction, failure by the other party to
complete the transaction may result in the Fund missing the opportunity of
obtaining a price or yield considered to be advantageous. The Fund will engage
in when-issued and delayed delivery transactions for the purpose of acquiring
securities consistent with the Fund's investment objective and policies and not
for the purpose of investment leverage.

The Fund may lend its portfolio securities in an amount up to 50% of its total
assets to

                                        9
<PAGE>   10

broker-dealers, banks or other recognized institutional borrowers of securities.
Such loans must be callable at any time and the borrower at all times during the
loan must maintain cash or liquid securities as collateral or provide the Fund
an irrevocable letter of credit equal to at least 100% of the value of the
securities loaned (including accrued interest). During the time portfolio
securities are on loan, the Fund receives any dividends or interest paid on such
securities and receives the interest earned on the collateral which is invested
in short-term instruments or receives an agreed-upon amount of interest income
from the borrower who has delivered the collateral or letter of credit. As with
any extensions of credit, there are risks of delay in recovery and in some cases
even loss of rights in the collateral should the borrower of the securities fail
financially.

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 Statement of
Additional Information.

Although the Fund does not intend to engage in substantial short-term trading,
it 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 growth has lessened or
otherwise. The Fund's portfolio turnover is shown under the heading "Financial
Highlights." The portfolio turnover rate may be expected to vary from year to
year. A high portfolio turnover rate (100% or more) increases the Fund's
transactions costs, including brokerage commissions or dealer costs, and may
result in the realization of more short-term capital gains than if the Fund had
lower portfolio turnover. Increases in the Fund's transaction costs would impact
the Fund's performance. The turnover rate will not be a limiting factor,
however, if the Fund's investment adviser considers portfolio changes
appropriate.

TEMPORARY DEFENSIVE STRATEGY. When market conditions dictate a more "defensive"
investment strategy, the Fund may invest on a temporary basis 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 growth on these securities will tend to be lower than the potential
for capital growth on other securities that may be owned by the Fund. The Fund
may not achieve its investment objective if it takes a defensive position.

YEAR 2000 RISKS. Like other mutual funds, financial and business organizations
and individuals around the world, the Fund could be adversely affected if the
computer systems used by the Fund's investment adviser and other service
providers do not properly process and calculate date-related information and
data from and after January 1, 2000. This is commonly known as the "Year 2000
Problem." The Fund's investment adviser is taking steps that it believes are
reasonably designed to address the Year 2000 Problem with respect to computer
systems that it uses and to obtain reasonable assurances that comparable steps
are being taken by the Fund's other major service providers. At this time, there
can be no assurances that these steps will be sufficient to avoid any adverse
impact to the Fund. In addition, the Year 2000 Problem may adversely affect the
markets and the issuers of securities in which the Fund may invest which, in
turn, may adversely affect the net asset value of the Fund. Improperly
functioning trading systems may result in settlement problems and liquidity
issues. In addition, corporate and governmental data processing errors may
result in production problems for individual companies or issuers and overall
economic uncertainty. Earnings of individual issuers will be affected by
remediation costs, which may be substantial and may be reported inconsistently
in U.S. and foreign financial statements. Accordingly, the Fund's investments
may be adversely affected. The statements above are subject to the Year 2000
Information and Readiness Disclosure Act which Act may limit the legal rights
regarding the use of such statements in the case of a dispute.

                                       10
<PAGE>   11

                          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 with more than two million
retail investor accounts, extensive capabilities for managing institutional
portfolios, and more than $75 billion under management or supervision. Van
Kampen Investments' more than 50 open-end and 39 closed-end funds and more than
2,500 unit investment trusts are professionally distributed by leading financial
advisers 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, PO Box 5555, Oakbrook
Terrace, Illinois 60181-5555.

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

<TABLE>
<CAPTION>
    Average Daily Net Assets   % Per Annum
-----------------------------------------------
<S> <C>                       <C>           <C>
    First $500 million        0.75 of 1.00%
 ...............................................
    Next $500 million         0.70 of 1.00%
 ...............................................
    Over $1 billion           0.65 of 1.00%
 ...............................................
</TABLE>

Applying this fee schedule, the Fund paid the Adviser an advisory fee at the
effective rate of 0.75% of the Fund's average daily net assets for the Fund's
fiscal period ended March 31, 1999.

Under the Advisory Agreement, the Adviser furnishes offices, necessary
facilities and equipment, provides administrative services, and permits its
officers and employees to serve without compensation as trustees of the Trust or
officers of the Fund if elected to such positions. The Fund pays all charges and
expenses of its day-to-day operations, including the compensation of trustees of
the Trust (other than those who are affiliated persons of the Adviser,
Distributor or Van Kampen Investments), the charges and expenses of legal
counsel and independent accountants, distribution fees, service fees, custodian
fees, the costs of providing reports to shareholders, 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 and the Adviser have adopted Codes of
Ethics designed to recognize the fiduciary relationship between the Fund and the
Adviser and its 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.

                                       11
<PAGE>   12

PORTFOLIO MANAGEMENT. The Fund is managed by a team of portfolio managers.
Senior Portfolio Managers Gary M. Lewis and Dudley Brickhouse are the co-lead
managers of the Fund. Mr. Lewis has overall responsibility for the team of
portfolio managers which manages the Van Kampen Emerging Growth, Van Kampen
Select Growth and Van Kampen Technology Funds in addition to the Fund. Mr. Lewis
has been a Senior Vice President of the Adviser and Asset Management since
September 1995. Mr. Lewis became a Vice President and Portfolio Manager of Asset
Management in June 1991. Mr. Lewis has been employed by Asset Management since
September 1986. He has been affiliated with the Fund since its inception.

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 1985. He has been affiliated with the Fund since September
1997.

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

Mr. Hart has been a Portfolio Manager since January 1998, and a 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 held 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 February 2000.

Ms. Luby 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. Ms. Luby became an Assistant Vice President of the Adviser and Asset
Management in December 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 also has been the
portfolio manager for various unit investment trusts managed by the Adviser or
its affiliates since August 1999. She has been affiliated with the Fund since
its inception.

Mr. Walker 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. Walker became an Assistant Vice President of the Adviser and 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 also has been the portfolio manager for various unit investment
trusts managed by the Adviser or its affiliates since September 1997. 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 shares that is most beneficial given the
amount to be invested and the length of time the investor expects to hold the
shares.

Initial investments must be at least $1,000 for each class of shares, and
subsequent investments must be at least $25 for each class of shares. Both
minimums may be waived by the Distributor for plans involving periodic
investments.

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 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) generally, each
class of shares has exclusive voting rights with respect to approvals of the
Rule 12b-1 distribution plan (described below) pursuant to which its
distribution fee or 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

                                       12
<PAGE>   13

(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 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 values per share and adjust the offering price more frequently than once a
day if deemed desirable. Net asset value per share for each class is determined
by dividing the value of the Fund's portfolio securities, cash and other assets
(including accrued interest) attributable to such class, less all liabilities
(including accrued expenses) attributable to such class, by the total number of
shares of the class outstanding. Such computation is made by using prices as of
the close of trading on the Exchange and (i) valuing securities listed or traded
on a national securities exchange at the last reported sale price, or if there
has been no sale that day, at the mean between the last reported bid and asked
prices, (ii) valuing over-the-counter securities at the last reported sale price
from the National Association of Securities Dealer's Automated Quotations
("NASDAQ"), (iii) valuing unlisted securities at the last quoted bid price and
(iv) valuing any securities for which market quotations are not readily
available and any other assets at fair value as determined in good faith by the
Adviser in accordance with procedures established by the Board of Trustees.
Securities with remaining maturity of 60 days or less are valued on an amortized
cost basis, which approximates market value.

The Fund has adopted a distribution plan (the "Distribution Plan") with respect
to each class of its shares pursuant to Rule 12b-1 under the 1940 Act. The Fund
also has adopted a service plan (the "Service Plan") with respect to each 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 the provision of ongoing services to
shareholders of each class.

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 fees and other expenses associated with such class of shares. To
assist investors in comparing classes of shares, the tables under the 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.

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

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

                                       13
<PAGE>   14

authorized dealers distributing the Fund's shares are entitled to receive
compensation for 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 on 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 computed net asset value per share provided
they are received by Investor Services prior to Investor Services' close of
business on such date. It is the responsibility of authorized dealers to
transmit orders received by them to Investor Services so they will be received
in a timely manner.

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

Investor accounts will automatically be credited with additional shares of the
Fund after any Fund distributions, such as dividends and capital gains
distributions, unless the investor instructs the Fund otherwise. Investors
wishing to receive cash instead of additional shares should contact the Fund at
(800) 341-2911 or by writing to the Fund, c/o Van Kampen Investors 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 imposes 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 gains dividends.

Under the Distribution Plan and Service Plan, the Fund may spend a total of
0.25% per year of the average daily net assets with respect to the 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 the
Class A Shares for the ongoing provision of services to Class A shareholders by
the Distributor and by brokers, dealers or financial intermediaries and for the
maintenance of such shareholders' accounts.

                                       14
<PAGE>   15

                                 CLASS B SHARES

Class B Shares of the Fund are sold at net asset value and are subject to a
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 gains 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 the purchase of Class B Shares
until the time of redemption of such shares. Solely for purposes of determining
the number of years from the time of any payment for the purchase of shares, all
payments during a month are totaled and deemed to have been made on the last day
of the month.

In determining whether a contingent deferred sales charge applies to a
redemption, it is assumed that the redemption is first of any shares in the
shareholder's Fund account that are not subject to a contingent deferred sales
charge and then of 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
average daily net assets with respect to the 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 the Class B Shares for the
ongoing provision of services to Class B shareholders by the Distributor and by
brokers, dealers or financial intermediaries and for the maintenance of such
shareholders' accounts.

                                 CLASS C SHARES

Class C Shares of the Fund are sold at net asset value and are subject to a
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 gains 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 is applicable to a
redemption, it is assumed that the redemption is first of any shares in the
shareholder's Fund account that are not subject to a contingent deferred sales
charge and then of 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
average daily net assets with respect to the 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 the Class C Shares for the
ongoing provision of services to Class C shareholders by the Distributor and by
brokers, dealers or financial intermediaries and for the maintenance of such
shareholders' accounts.

                               CONVERSION FEATURE

Class B Shares purchased on or after June 1, 1996, and any dividend reinvestment
plan Class B Shares received on such shares, automatically convert to

                                       15
<PAGE>   16

Class A Shares eight years after the end of the calendar month in which the
shares were purchased. Class B Shares purchased before June 1, 1996, and any
dividend reinvestment plan Class B Shares received on such shares, automatically
convert to Class A Shares six years after the end of the calendar month in which
the shares were purchased. Class C Shares purchased before January 1, 1997, and
any dividend reinvestment plan Class C Shares received on such shares,
automatically convert to Class A Shares ten years after the end of the calendar
month in which such shares were purchased. Such conversion will be on the basis
of the relative net asset value 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 dividends or distributions 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
involuntary liquidation by the Fund of a shareholder's account as described
under the 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 within 180 days after the redemption. 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 receive 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 which have been previously purchased and are
still owned.

LETTER OF INTENT. A Letter of Intent provides an opportunity for an investor to
obtain a reduced sales

                                       16
<PAGE>   17

charge by aggregating the 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 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 time of the
expiration of the Letter of Intent to give effect to the lower charge. Such
adjustment in sales charge will be used to purchase additional shares for the
shareholder at the applicable discount category. 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 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 charge 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 the unit investment trust reinvestment program and
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.

UNIT INVESTMENT TRUST REINVESTMENT PROGRAM. The Fund permits unitholders of unit
investment trusts to reinvest distributions from such trusts in Class A Shares
of the Fund at net asset value per share and with no minimum initial or
subsequent investment requirement, if the administrator of an investor's unit
investment trust program meets certain uniform criteria relating to cost savings
by the Fund and the Distributor. The total sales charge for all other
investments made from unit trust distributions will be 1.00% of the offering
price (1.01% of net asset value). Of this amount, the Distributor will pay to
the authorized dealer, if any, through which such participation in the
qualifying program was initiated 0.50% of the offering price as a dealer
concession or agency commission. Persons desiring more information with respect
to this program, including the terms and conditions that apply to the program,
should contact their authorized dealer or the Distributor.

The administrator of such a unit investment trust must have an agreement with
the Distributor pursuant to which the administrator will (1) submit a single
bulk order and make payment with a single remittance for all investments in the
Fund during each distribution period by all investors who choose to invest in
the Fund through the program and (2) provide Investor Services with appropriate
backup data for each investor participating in the program in a computerized
format fully compatible with Investor Services' processing system.

As further requirements for obtaining these special benefits, the Fund also
requires that all dividends and other distributions by the Fund be reinvested in
additional shares without any systematic withdrawal program. There will be no
minimum for reinvestments from unit investment trusts. The Fund will send
account activity statements to such participants on a quarterly basis only, even
if their investments are made more frequently. The Fund reserves the right to
modify or terminate this program at any time.

NET ASSET VALUE PURCHASE OPTIONS. Class A Shares of the Fund may be purchased at
net asset value, 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 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 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.

                                       17
<PAGE>   18

(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) Trustees and other fiduciaries purchasing shares for retirement plans which
    invest in multiple fund families through broker-dealer retirement plan
    alliance programs that have entered into agreements with the Distributor and
    which are subject to certain minimum size and operational requirements.
    Trustees and other fiduciaries should refer to the Statement of Additional
    Information for further details with respect to such alliance programs.

(6) 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.

(7) 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.

(8) Trusts created under pension, profit sharing or other employee benefit plans
    qualified under Section 401(a) of the Internal Revenue Code of 1986, as
    amended (the "Code"), or custodial accounts held by a bank created pursuant
    to Section 403(b) of the Code and sponsored by nonprofit organizations
    defined under Section 501(c)(3) of the Code and assets held by an employer
    or trustee in connection with an eligible deferred compensation plan under
    Section 457 of the Code. Such plans will qualify for purchases at net asset
    value provided, for plans initially establishing accounts with the
    Distributor in the Participating Funds after February 1, 1997, that (1) the
    initial amount invested in the Participating Funds is at least $500,000 or
    (2) such shares are purchased by an employer sponsored plan with more than
    100 eligible employees. Such plans that have been established with a
    Participating Fund or have received proposals from the Distributor prior to
    February 1, 1997 based on net asset value purchase privileges previously in
    effect will be qualified to purchase shares of the Participating Funds at
    net asset value for accounts established on or before May 1, 1997. Section
    403(b) and similar accounts for which Van Kampen Trust Company serves as
    custodian will not be eligible for net asset value purchases based on the
    aggregate investment made by the plan or the number of eligible employees,
    except under certain uniform criteria established by the Distributor from
    time to time. Prior to February 1, 1997, a commission will be paid to
    authorized dealers who initiate and are responsible for such purchases
    within a rolling twelve-month period as follows: 1.00% on sales to $5
    million, plus 0.50% on the next $5 million, plus 0.25% on the excess over
    $10 million. For purchases on February 1, 1997 and thereafter, a commission
    will be paid as follows: 1.00% on sales to $2 million, plus 0.80% on the
    next $1 million, plus 0.50% on the next $47 million, plus 0.25% on the
    excess over $50 million.

(9) 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

                                       18
<PAGE>   19

    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 under 21 years of age
and grandchildren, 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 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 on
purchases made as described in (3) through (9) 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 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 of a
retirement plan account may involve additional fees charged by the dealer or
custodian.

Except as specified below under "Telephone Redemption Requests," payment for
shares redeemed generally will be made by check mailed within seven days after
receipt by Investor Services of the request and any other necessary documents in
proper order. 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. 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. A taxable gain or
loss will be recognized by the shareholder upon redemption of shares.

WRITTEN REDEMPTION REQUESTS. Shareholders may request a redemption of shares by
written request in proper form sent directly to Van Kampen Investor Services
Inc., PO Box 218256, Kansas City, MO 64121-8256. The request for redemption
should indicate the number of shares to be redeemed, the class designation of
such shares and the shareholder's account number. The redemption request must be
signed by all persons in whose names the shares are registered. Signatures must
conform exactly to the account registration. If the proceeds of the redemption
exceed $50,000, or if the proceeds are not to be paid to the record owner at the
record address, or if the record address has changed within the previous 30
days, signature(s) must be guaranteed by one of 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 to be in proper form. In some
cases, however, additional documents may be necessary. In the case of
shareholders holding certificates, the certificates for the shares being
redeemed properly endorsed for transfer must accompany the redemption request.
In the event the redemption is requested by a corporation, partnership, trust,
fiduciary, executor or administrator, and the name and title of the
individual(s) authorizing such redemption is not shown in the account
registration, 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. IRA redemption requests should be sent to the
IRA custodian to be forwarded to

                                       19
<PAGE>   20

Investor Services. Contact the IRA custodian 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 authorized dealer. Orders sent through authorized dealers
must be at least $500 (unless transmitted by your authorized dealer via the
FUNDSERV network). 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. To establish
such privilege, a shareholder must complete the appropriate section of the
application form accompanying this prospectus or call the Fund at (800) 341-2911
to request that a copy of the Telephone Redemption Authorization form be sent to
them for completion. To redeem shares, contact the telephone transaction line at
(800) 421-5684. Van Kampen Investments, 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,
neither Van Kampen Investments, Investor Services nor 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 all
accounts other than retirement accounts or accounts with shares represented by
certificates. If an account has multiple owners, Investor Services may rely on
the instructions of any one owner.

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

OTHER REDEMPTION INFORMATION. The Fund may redeem shares of 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 two kinds of return from the Fund: dividends and
capital gains dividends.

                                       20
<PAGE>   21

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

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 GAINS. 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. Net realized capital gains represent the total
profit from sales of securities minus total losses from sales of securities
including losses carried forward from prior years. The Fund distributes any
taxable net realized capital gains to shareholders as capital gains dividends at
least annually. As in the case of dividends, capital gains dividends are
automatically reinvested in additional shares of the Fund at net asset value
unless the shareholder instructs otherwise.

                              SHAREHOLDER SERVICES

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

REINVESTMENT PLAN. A convenient way for investors to accumulate additional
shares is by accepting dividends and capital gains distributions 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 gains
distribution. Unless the shareholder instructs otherwise, the reinvestment plan
is automatic. This instruction may be made by telephone by calling (800)
341-2911 ((800) 421-2833 for the hearing impaired) or by writing to Investor
Services. The investor may, on the initial application or prior to any
declaration, instruct that dividends be paid in cash and capital gains
distributions be reinvested at net asset value, or that both dividends and
capital gains distributions be paid in cash.

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

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

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 Class B Shares and Class C Shares 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. If such Class B Shares or Class C Shares are redeemed and
not exchanged for shares of another Participating Fund, Class B Shares and Class
C Shares are subject to the contingent deferred sales charge schedule imposed by
the Participating Fund from which such shares were originally purchased.

Exchanges of shares are sales and may result in a gain or loss for federal
income tax purposes. If the shares exchanged have been held for less than 91
days, the

                                       21
<PAGE>   22

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 or by contacting the telephone transaction line at (800)
421-5684. A shareholder automatically has telephone exchange privileges unless
otherwise designated in the application form accompanying the prospectus. Van
Kampen Investments, 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, neither Van
Kampen Investments, Investor Services nor 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 gains 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 privileges to such shareholders. For further
information on these restrictions see the 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 in the fund from which the
shareholder is withdrawing an investment will be redeemed at the net asset value
per share next determined on the date of receipt. Shares of the new fund into
which the shareholder is investing 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
shares of the funds involved in the request are priced will be processed on the
next business day in the manner described herein.

A prospectus of any of these Participating Funds may be obtained from any
authorized dealer or the Distributor. An investor considering an exchange to one
of such funds should refer to the prospectus for additional information
regarding such fund prior to investing.

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 instruction. Van Kampen Investments, 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, neither Van Kampen Investments, Investor Services nor the Fund will be
liable for following instructions 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.

                                       22
<PAGE>   23

                                 FEDERAL INCOME
                                    TAXATION

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

The sale or exchange of shares is a taxable transaction for federal income tax
purposes. Shareholders who sell their shares will generally recognize gain or
loss in an amount equal to the difference between their adjusted tax basis in
the shares and the amount received. If the shares are held as a capital asset,
the gain or loss will be a capital gain or loss. Any 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 U.S. tax
advisers concerning the tax consequences to them of an investment in shares.

The Fund intends to qualify as a regulated investment company under the federal
income tax law. If the Fund so qualifies and distributes each year to its
shareholders at least 90% of its net investment income, the Fund will not be
required to pay federal income taxes on any income it distributed to
shareholders. If the Fund distributes less than the sum of 98% of its ordinary
income and 98% of its capital gains 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 or disposing of shares,
as well as the effects of state, local and foreign tax law and any proposed tax
law changes.

                                       23
<PAGE>   24

                              FINANCIAL HIGHLIGHTS

The financial highlights table is intended to help you understand the Fund's
financial performance for the periods indicated. Certain information reflects
financial results for a single Fund share. The total returns in the table
represent the rate that an investor would have earned (or lost) on an investment
in the Fund (assuming reinvestment of all dividends and distributions). This
information has been audited by KPMG LLP, independent accountants, whose report,
along with the Fund's financial statements, is included in the Statement of
Additional Information and may be obtained by shareholders without charge by
calling the telephone number on the back cover of this prospectus. This
information should be read in conjunction with the financial statements and
notes thereto included in the Statement of Additional Information.
<TABLE>
<CAPTION>
                                                  Class A Shares       May 29, 1996
                              Nine Month       Year Ended June       (Commencement of
                             Period Ended            30,          Investment Operations)
                           March 31, 1999(b)    1998      1997       to June 30, 1996
----------------------------------------------------------------------------------------
<S>                        <C>                 <C>       <C>      <C>
Net Asset Value,
  Beginning of the
  Period...............         $13.676         $9.948   $9.118           $9.430
                                -------        -------   ------           ------
  Net Investment
    Loss...............           (.125)         (.135)   (.065)           (.002)
  Net Realized and
    Unrealized
    Gain/Loss..........           4.445          3.863     .895            (.310)
                                -------        -------   ------           ------
Total from Investment
  Operations...........           4.320          3.728     .830            (.312)
                                -------        -------   ------           ------
Less Distributions from
  Net Realized Gain....            .859            -0-      -0-              -0-
                                -------        -------   ------           ------
Net Asset Value, End of
  the Period...........         $17.137        $13.676   $9.948           $9.118
                                -------        -------   ------           ------
Total Return(a)........          33.72%**       37.49%    9.10%           (3.29%)**
                                =======        =======   ======           ======
Net Assets at End of
  the Period (In
  millions)............          $242.6         $117.5    $84.0            $30.3
Ratio of Expenses to
  Average Net
  Assets*..............           1.56%          1.44%    1.30%            1.29%
Ratio of Net Investment
  Loss to Average Net
  Assets*..............          (1.22%)        (1.09%)   (.81%)           (.50%)
Portfolio Turnover.....            126%**         185%     186%               4%**
 *  If certain expenses
    had not been
    assumed by the
    Adviser, Total
    Return would have
    been lower and the
    ratios would have
    been as follows:
    Ratio of Expenses
      to Average Net
      Assets...........             N/A          1.61%    1.61%            2.05%
    Ratio of Net
      Investment Loss
      to Average Net
      Assets...........             N/A         (1.26%)  (1.12%)          (1.25%)

<CAPTION>
                                                Class B Shares       May 29, 1996
                         Nine Month Period   Year Ended June       (Commencement of
                               Ended               30,          Investment Operations)
                         March 31, 1999(b)    1998      1997       to June 30, 1996
<S>                      <C>                 <C>       <C>      <C>
Net Asset Value,
  Beginning of the
  Period...............       $13.461         $9.867   $9.112           $9.430
                              -------        -------   ------           ------
  Net Investment
    Loss...............         (.197)         (.204)   (.105)           (.006)
  Net Realized and
    Unrealized
    Gain/Loss..........         4.342          3.798     .860            (.312)
                              -------        -------   ------           ------
Total from Investment
  Operations...........         4.145          3.594     .755            (.318)
                              -------        -------   ------           ------
Less Distributions from
  Net Realized Gain....          .859            -0-      -0-              -0-
                              -------        -------   ------           ------
Net Asset Value, End of
  the Period...........       $16.747        $13.461   $9.867           $9.112
                              -------        -------   ------           ------
Total Return(a)........        32.99%**       36.37%    8.34%           (3.39%)**
                              =======        =======   ======           ======
Net Assets at End of
  the Period (In
  millions)............        $231.8         $148.4    $94.2            $25.5
Ratio of Expenses to
  Average Net
  Assets*..............         2.33%          2.20%    2.05%            2.06%
Ratio of Net Investment
  Loss to Average Net
  Assets*..............        (1.99%)        (1.85%)  (1.55%)          (1.28%)
Portfolio Turnover.....          126%**         185%     186%               4%**
 *  If certain expenses
    had not been
    assumed by the
    Adviser, Total
    Return would have
    been lower and the
    ratios would have
    been as follows:
    Ratio of Expenses
      to Average Net
      Assets...........           N/A          2.37%    2.35%            2.81%
    Ratio of Net
      Investment Loss
      to Average Net
      Assets...........           N/A         (2.02%)  (1.86%)          (2.04%)

<CAPTION>
                                                Class C Shares       May 29, 1996
                         Nine Month Period   Year Ended June       (Commencement of
                               Ended               30,          Investment Operations)
                         March 31, 1999(b)    1998      1997       to June 30, 1996
<S>                      <C>                 <C>       <C>      <C>                    <C>
Net Asset Value,
  Beginning of the
  Period...............       $13.470         $9.869   $9.113           $9.430
                              -------        -------   ------           ------
  Net Investment
    Loss...............         (.197)         (.203)   (.103)           (.006)
  Net Realized and
    Unrealized
    Gain/Loss..........         4.348          3.804     .859            (.311)
                              -------        -------   ------           ------
Total from Investment
  Operations...........         4.151          3.601     .756            (.317)
                              -------        -------   ------           ------
Less Distributions from
  Net Realized Gain....          .859            -0-      -0-              -0-
                              -------        -------   ------           ------
Net Asset Value, End of
  the Period...........       $16.762        $13.470   $9.869           $9.113
                              -------        -------   ------           ------
Total Return(a)........        32.96%**       36.47%    8.34%           (3.39%)**
                              =======        =======   ======           ======
Net Assets at End of
  the Period (In
  millions)............         $27.4          $16.4    $10.8             $3.9
Ratio of Expenses to
  Average Net
  Assets*..............         2.33%          2.20%    2.05%            2.05%
Ratio of Net Investment
  Loss to Average Net
  Assets*..............        (1.98%)        (1.85%)  (1.54%)          (1.28%)
Portfolio Turnover.....          126%**         185%     186%               4%**
 *  If certain expenses
    had not been
    assumed by the
    Adviser, Total
    Return would have
    been lower and the
    ratios would have
    been as follows:
    Ratio of Expenses
      to Average Net
      Assets...........           N/A          2.36%    2.35%            2.81%
    Ratio of Net
      Investment Loss
      to Average Net
      Assets...........           N/A         (2.02%)  (1.85%)          (2.04%)
</TABLE>

**  Non-Annualized.
(a)  Total Return is based upon net asset value which does not include payment
     of the maximum sales charge or contingent deferred sales charge.
(b)  Based on average shares outstanding.
N/A = Not applicable.

                       See Notes to Financial Statements.

                                       24
<PAGE>   25

                              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

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

                                    WEB SITE
                               www.vankampen.com

                       VAN KAMPEN AGGRESSIVE 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 Aggressive Growth Fund

                                   Custodian

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

                                 Legal Counsel

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

                            Independent Accountants

                               ERNST & YOUNG LLP
                             233 South Wacker Drive
                               Chicago, IL 60606
<PAGE>   26

                                   VAN KAMPEN
                            AGGRESSIVE  GROWTH  FUND

                                   PROSPECTUS
                                 JULY 29, 1999,
                        AS SUPPLEMENTED ON JUNE 2, 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 Public
                 Reference Room in Washington, DC or online at
                 the SEC's web site (http://www.sec.gov). For
                 more information, please call the SEC at (800)
                 SEC-0330. You can also request these materials
                 by writing the Public Reference Section of the
                 SEC, Washington DC, 20549-6009, and paying a
                 duplication fee.

                            [VAN KAMPEN FUNDS LOGO]

    The Fund's Investment Company Act File No. is 811-4805.     AGG PRO 6/00


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