VAN KAMPEN ENTERPRISE FUND
497, 2000-08-03
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<PAGE>   1

                                  VAN  KAMPEN
                                ENTERPRISE  FUND

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

                   This prospectus is dated  APRIL 28, 2000,
                        AS SUPPLEMENTED ON MAY 25, 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.......................   9
Purchase of Shares.................................  11
Redemption of Shares...............................  17
Distributions from the Fund........................  18
Shareholder Services...............................  19
Federal Income Taxation............................  20
Financial Highlights...............................  22
</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 the investment objective to seek capital
appreciation by investing in a portfolio of securities consisting principally of
common stocks.

                             INVESTMENT STRATEGIES

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

                                INVESTMENT RISKS

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

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

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

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

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

                                INVESTOR PROFILE

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

- Seek capital appreciation over the long term

- Do not seek current income from their investment

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

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

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

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

                                        3
<PAGE>   4

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

                               ANNUAL PERFORMANCE

One way to measure the risks of investing in the Fund is to look at how its
performance has varied from year-to-year. The following chart shows the annual
returns of the Fund's Class A Shares over the ten 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>
1990                                                                             -2.87
1991                                                                             39.23
1992                                                                              8.39
1993                                                                             10.95
1994                                                                             -0.19
1995                                                                             33.92
1996                                                                             23.49
1997                                                                             28.55
1998                                                                             23.56
1999                                                                             26.56
</TABLE>

The Fund's return for the three month period ended March 31, 2000 was 11.78%.

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

                            COMPARATIVE PERFORMANCE

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

<TABLE>
<CAPTION>
     Average Annual
      Total Returns                        Past 10
         for the                            Years
      Periods Ended     Past     Past     or Since
    December 31, 1999  1 Year   5 Years   Inception
-------------------------------------------------------
<S> <C>                <C>      <C>       <C>       <C>
    Van Kampen
    Enterprise Fund--
    Class A Shares     19.25%   25.64%     17.66%
    Standard & Poor's
    500-Stock Index    21.04%   28.56%     18.21%
    Russell 1000
    Growth Index       33.16%   32.41%     20.32%
    Lipper Growth
    Fund Index         27.96%   26.27%     17.25%
 .......................................................
    Van Kampen
    Enterprise Fund--
    Class B Shares     20.53%   26.01%     19.49%(1)****
    Standard & Poor's
    500-Stock Index    21.04%   28.56%     20.75%(1)
    Russell 1000
    Growth Index       33.16%   32.41%     20.74%(2)
    Lipper Growth
    Fund Index         27.96%   26.27%     19.36%(1)
 .......................................................
    Van Kampen
    Enterprise Fund--
    Class C Shares     24.59%   26.17%     20.66%(3)
    Standard & Poor's
    500-Stock Index    21.04%   28.56%     22.84%(4)
    Russell 1000
    Growth Index       33.16%   32.41%     26.35%(5)
    Lipper Growth
    Fund Index         27.96%   26.72%     21.00%(4)
 .......................................................
</TABLE>

 Inception dates: (1) 12/20/91, (2) 12/31/91, (3) 7/20/93, (4) 7/23/93, (5)
7/31/93.
   * The Standard and Poor's 500-Stock Index consists of 500 widely-held common
     stock of companies with market capitalization of $1 billion or more that
     are a representative sample of

                                        4
<PAGE>   5

approximately 100 industries, chosen mainly for market size, liquidity and
industry group representation (assumes dividends are reinvested).
  ** The Russell 1000 Growth Index measures the performance of those Russell
     1000 Index companies with higher price-to-book ratios and higher forecasted
     growth values. The Russell 1000 Index is an index of the 1,000 largest U.S.
     companies based on market capitalization.
 *** Since Lipper Analytical Services has reclassified how it categorizes many
     of its indices, the Fund's investment adviser believes the new system is
     less applicable for this Fund. Based on the Fund's asset composition, the
     Fund's investment adviser believes adding the Russell 1000 Growth Index
     provides a more appropriate benchmark for the Fund, and the Lipper Growth
     Fund Index will not be shown in future prospectuses of the Fund.
**** The "Since Inception" performance for Class B Shares reflects the
     conversion of such shares into Class A Shares six years after the end of
     the calendar month in which shares were purchased. Class B Shares purchased
     on or after June 1, 1996 will convert to Class A Shares eight years after
     purchase. See "Purchase of Shares."

                               FEES AND EXPENSES
                                  OF THE FUND
This table describes the fees and expenses that you may pay if you buy and hold
shares of the Fund.

<TABLE>
<CAPTION>
                       Class A  Class B   Class C
                       Shares   Shares    Shares
-----------------------------------------------------

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

<TABLE>
<CAPTION>

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

ANNUAL FUND OPERATING EXPENSES
(expenses that are deducted from Fund assets)
-----------------------------------------------------
<S>                    <C>      <C>       <C>     <C>
Management fees        0.44%    0.44%     0.44%
 .....................................................
Distribution and/or
service (12b-1)        0.23%    1.00%(6)  1.00%(6)
fees(5)
 .....................................................
Other expenses         0.24%    0.23%     0.24%
 .....................................................
Total annual fund
operating expenses     0.91%    1.67%     1.68%
 .....................................................
</TABLE>

(1) Reduced for purchases of $50,000 and over. See "Purchase of Shares--Class A
    Shares."
(2) Investments of $1 million or more are not subject to any sales charge at the
    time of purchase, but a deferred sales charge of 1.00% may be imposed on
    certain redemptions made within one year of the purchase. See "Purchase of
    Shares--Class A Shares."
(3) The maximum deferred sales charge is 5.00% in the first year after purchase,
    declining thereafter as follows:
                                   Year 1-5.00%
                                   Year 2-4.00%
                                   Year 3-3.00%
                                   Year 4-2.50%
                                   Year 5-1.50%
                                    After-None
     See "Purchase of Shares--Class B Shares."

                                        5
<PAGE>   6

(4) The maximum deferred sales charge is 1.00% in the first year after purchase
    and 0.00% thereafter. See "Purchase of Shares--Class C Shares."
(5) Class A Shares are subject to an annual service fee of up to 0.25% of the
    average daily net assets attributable to such class of shares. Class B
    Shares and Class C Shares are each subject to a combined annual distribution
    and service fee of up to 1.00% of the average daily net assets attributable
    to such class of shares. See "Purchase of Shares."
(6) Because distribution and/or service (12b-1) fees are paid out of the Fund's
    assets on an ongoing basis, over time these fees will increase the cost of
    your investment and may cost you more than paying other types of sales
    charges.

Example:

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

The example assumes that you invest $10,000 in the Fund for the time periods
indicated and then redeem all of your shares at the end of those periods. The
example also assumes that your investment has a 5% return each year and that the
Fund's operating expenses remain the same each year (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             $663       $848      $1,050      $1,630
 ......................................................................
Class B Shares             $670       $826      $1,057      $1,774(1)
 ......................................................................
Class C Shares             $271       $530        $913      $1,987
 ......................................................................
</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             $663       $848      $1,050      $1,630
 ......................................................................
Class B Shares             $170       $526        $907      $1,774(1)
 ......................................................................
Class C Shares             $171       $530        $913      $1,987
 ......................................................................
</TABLE>

(1) Based on conversion to Class A Shares after eight years.

                             INVESTMENT OBJECTIVE,
                               POLICIES AND RISKS

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

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

In selecting securities for investment, the Fund generally focuses on common
stocks of "growth" companies, including companies with new products, services or
processes. The investment adviser seeks such securities which it believes offer
a combination of strong business fundamentals at an attractive valuation. Growth
companies generally include those companies with established records of growth
in sales or earnings that the Fund's investment adviser believes are in or are
entering into a growth cycle in their respective businesses, with the
expectation that the stock of such companies will increase in value. Stocks of
different types, such as "growth" stocks or "value" stocks, tend to shift in and
out of favor depending on market and economic conditions. Thus, the value of the
Fund's investments in "growth" stocks will vary and at times may be lower or
higher than that of other types of funds. The market values of "growth" common
stocks may be more volatile than other types of investments. The Fund may invest

                                        6
<PAGE>   7

in companies generating or applying new technologies, new or improved
distribution techniques or new services, which companies may benefit from
changing consumer demands or lifestyles. The Fund may also invest in companies
that have projected earnings in excess of the average for their sector or
industry. In each case, the Fund's investment adviser believes companies have
prospects that are favorable for above-average capital appreciation. The Fund
may also focus its investments on stocks of companies in cyclical industries
during periods when their securities appear attractive for capital appreciation.

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

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

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

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

                             RISKS OF INVESTING IN

                         SECURITIES OF FOREIGN ISSUERS

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

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

Delays in making trades in foreign securities relating to volume constraints,
limitations or restrictions, clearance or settlement procedures, or otherwise
could impact returns and result in temporary periods

                                        7
<PAGE>   8

when assets of the Fund are not fully invested or attractive investment
opportunities are foregone.

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

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

                        USING OPTIONS, FUTURES CONTRACTS

                              AND RELATED OPTIONS

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

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

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

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

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

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

                                        8
<PAGE>   9

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

                       OTHER INVESTMENTS AND RISK FACTORS

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

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

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

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

The Fund may sell securities without regard to the length of time they have been
held in order to take advantage of new investment opportunities, or when the
Fund's investment adviser believes the potential for capital appreciation has
lessened, or for other reasons. The Fund's portfolio turnover is shown under the
heading "Financial Highlights." The portfolio turnover rate may vary from year
to year. A high portfolio turnover rate (100% or more) increases a fund's
transactions costs (including brokerage commissions or dealer costs) and a
higher portfolio turnover rate may result in the realization of more short-term
capital gains than if a fund had a lower portfolio turnover rate. Increases in a
fund's transaction costs would adversely 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 hold cash or invest a portion or all of its
assets in temporary investments. Under normal market conditions, the potential
for capital appreciation on these securities will tend to be lower than the
potential for capital appreciation on other securities that may be owned by the
Fund. In taking such a defensive position, the Fund would not be pursuing and
may not achieve its investment objective.

                          INVESTMENT ADVISORY SERVICES

THE ADVISER. Van Kampen Asset Management Inc. is the Fund's investment adviser
(the "Adviser" or "Asset Management"). The Adviser is a wholly owned subsidiary
of Van Kampen Investments Inc. ("Van Kampen Investments"). Van Kampen
Investments is a diversified asset management company with more than two million
retail investor accounts, extensive capabilities for managing institutional
portfolios, and more than $100 billion under management or supervision as of
March 31, 2000. Van Kampen Investments' more than 50 open-end and 39 closed-end
funds and more than 2,700 unit investment trusts are professionally distributed
by leading authorized dealers nationwide. Van Kampen Funds Inc., the distributor
of the Fund (the "Distributor") and the sponsor of the funds mentioned above, is
also a wholly owned subsidiary of Van Kampen Investments. Van Kampen

                                        9
<PAGE>   10

Investments is an indirect wholly owned subsidiary of Morgan Stanley Dean Witter
& Co. The Adviser's principal office is located at 1 Parkview Plaza, Oakbrook
Terrace, Illinois 60181-5555.

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

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

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

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

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

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

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

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

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

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

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

                                       10
<PAGE>   11

                               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. Minimum
investment amounts 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 generally bear the sales charge expenses at the time of
redemption and any expenses (including higher distribution fees and transfer
agency costs) resulting from such deferred sales charge arrangement, (ii) each
class of shares has exclusive voting rights with respect to approvals of the
Rule 12b-1 distribution plan and the service plan (each as described below)
under which its distribution fee and/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 (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 sufficient degree of trading in the Fund's portfolio
securities such that the Fund's net asset value per share might be materially
affected. The Fund's Board of Trustees reserves the right to calculate the net
asset value per share and adjust the offering price based thereon more
frequently than once daily if deemed desirable. Net asset value per share for
each class is determined by dividing the value of the Fund's portfolio
securities, cash and other assets (including accrued interest) attributable to
such class, less all liabilities (including accrued expenses) attributable to
such class, by the total number of shares of the class outstanding. Such
computation is made by using prices as of the close of trading on the Exchange
and (i) valuing securities listed or traded on a national securities exchange at
the last reported sale price, or if there has been no sale that day, at the mean
between the last reported bid and asked prices, (ii) valuing unlisted securities
at the mean between the last reported bid and asked prices available from the
National Association of Securities Dealers Automated Quotations ("NASDAQ") or
brokers-dealers and (iii) valuing any securities for which market quotations are
not readily available and any other assets at fair value as determined in good
faith by the Adviser based on procedures approved by the Board of Trustees of
the Fund. Short-term securities are valued in the manner described in the notes
to the financial statements included in the Fund's Statement of Additional
Information.

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 and the maintenance of the shareholders' accounts.

The amount of distribution and service fees varies among the classes offered by
the Fund. Because these fees are paid out of the Fund's assets on an ongoing
basis, these fees will increase the cost of your investment in the Fund. By
purchasing a class of shares subject to higher distribution and service fees,
you may pay more over time than on a class of shares with other types of sales
charge arrangements. Long-term shareholders may pay more than the economic
equivalent of the maximum front-end sales charges permitted by the rules of the
National Association of Securities Dealers, Inc. ("NASD"). The net income

                                       11
<PAGE>   12

attributable to a class of shares will be reduced by the amount of the
distribution and service fees and other expenses of the Fund associated with
that class of shares. To assist investors in comparing classes of shares, the
tables under the prospectus heading "Fees and Expenses of the Fund" provide a
summary of sales charges and expenses and an example of the sales charges and
expenses of the Fund applicable to each class of shares.

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

Shares may be purchased on any business day by completing the account
application form and forwarding the account application, directly or through an
authorized dealer, to the Fund's shareholder service agent, Van Kampen Investor
Services Inc. ("Investor Services"), a wholly owned subsidiary of Van Kampen
Investments. When purchasing shares of the Fund, investors must specify whether
the purchase is for Class A Shares, Class B Shares or Class C Shares by
selecting the correct Fund number on the account application. Sales personnel of
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 upon the next calculation of net asset
value per share (plus sales charges, where applicable) after an order is
received by Investor Services. Orders received by authorized dealers prior to
the close of the Exchange are priced based on the date of receipt provided such
order is transmitted to Investor Services prior to Investor Services' close of
business on such date. Orders received by authorized dealers after the close of
the Exchange or transmitted to Investor Services after its close of business are
priced based on the date of the next computed net asset value per share provided
they are received by Investor Services prior to Investor Services' close of
business on such date. It is the responsibility of authorized dealers to
transmit orders received by them to Investor Services so they will be received
in a timely manner.

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

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

                                 CLASS A SHARES

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

                                 CLASS A SHARES

                             SALES CHARGE SCHEDULE

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

* No sales charge is payable at the time of purchase on investments of $1
  million or more, although for such investments the Fund may impose a
  contingent deferred sales charge of 1.00% on certain redemptions made within
  one year of the purchase. The contingent deferred sales charge is assessed on
  an amount equal to the lesser of the then current market value or the cost of
  the shares being redeemed. Accordingly, no sales charge is imposed on
  increases in net asset value above the initial purchase price.

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

Under the Distribution Plan and the Service Plan, the Fund may spend up to a
total of 0.25% per year of

                                       12
<PAGE>   13

the Fund's average daily net assets with respect to Class A Shares of the Fund.
From such amount, under the Service Plan, the Fund may spend up to 0.25% per
year of the Fund's average daily net assets with respect to Class A Shares of
the Fund. The rates in this paragraph are 0.15% per year of the Fund's average
daily net assets attributable to Class A Shares with respect to accounts
existing before October 1, 1989.

                                 CLASS B SHARES

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

                                 CLASS B SHARES

                             SALES CHARGE SCHEDULE

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

The contingent deferred sales charge is assessed on an amount equal to the
lesser of the then current market value or the cost of the shares being
redeemed. Accordingly, no sales charge is imposed on increases in net asset
value above the initial purchase price. In addition, no sales charge is assessed
on shares derived from reinvestment of dividends or capital gain dividends. It
is presently the policy of the Distributor not to accept any order for Class B
Shares in an amount of $500,000 or more because it ordinarily will be more
advantageous for an investor making such an investment to purchase Class A
Shares.

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

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

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

                                 CLASS C SHARES

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

The contingent deferred sales charge is assessed on an amount equal to the
lesser of the then current market value or the cost of the shares being
redeemed. Accordingly, no sales charge is imposed on increases in net asset
value above the initial purchase price. In addition, no sales charge is assessed
on shares derived from reinvestment of dividends or capital gain dividends. It
is presently the policy of the Distributor not to accept any order for Class C
Shares in an amount of $1 million or more because it ordinarily will be more
advantageous for an investor making such an investment to purchase Class A
Shares.

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

Under the Distribution Plan, the Fund may spend up to 0.75% per year of the
Fund's average daily net assets with respect to Class C Shares of the Fund. In
addition, under the Service Plan, the Fund may spend up to 0.25% per year of the
Fund's average daily net assets with respect to Class C Shares of the Fund. The
aggregate distribution and service fees are currently 1.00% per year of the
average daily net assets attributable to Class C Shares of the Fund. The
aggregate distribution and service fees are 0.90% per year of the average daily
net assets attributable to Class C Shares of the Fund with respect to accounts
existing before April 1, 1995.

                                       13
<PAGE>   14

                               CONVERSION FEATURE

Class B Shares purchased on or after June 1, 1996, including Class B Shares
received from reinvestment of distributions through the dividend reinvestment
plan, automatically convert to Class A Shares eight years after the end of the
calendar month in which the shares were purchased. Class B Shares purchased
before June 1, 1996, including Class B Shares received from reinvestment of
distributions through the dividend reinvestment plan, 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, including Class
C Shares received from reinvestment of distributions through the dividend
reinvestment plan, 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 values per share, without the
imposition of any sales load, fee or other charge. The conversion schedule
applicable to a share of the Fund acquired through the exchange privilege from
another Van Kampen fund participating in the exchange program is determined by
reference to the Van Kampen fund from which such share was originally purchased.

The conversion of such shares to Class A Shares is subject to the continuing
availability of an opinion of counsel to the effect that (i) the assessment of
the higher distribution fee and transfer agency costs with respect to such
shares does not result in the Fund's dividends or capital gain dividends
constituting "preferential dividends" under the federal income tax law and (ii)
the conversion of shares does not constitute a taxable event under federal
income tax law. The conversion may be suspended if such an opinion is no longer
available and such shares might continue to be subject to the higher aggregate
fees applicable to such shares for an indefinite period.

                   WAIVER OF CONTINGENT DEFERRED SALES CHARGE

The contingent deferred sales charge is waived on redemptions of Class B Shares
and Class C Shares (i) within one year following the death or disability (as
disability is defined by federal income tax law) of a shareholder, (ii) for
required minimum distributions from an individual retirement account ("IRA") or
certain other retirement plan distributions, (iii) for withdrawals under the
Fund's systematic withdrawal plan but limited to 12% annually of the initial
value of the account, (iv) if no commission or transaction fee is paid to
authorized dealers at the time of purchase of such shares and (v) if made by the
Fund's involuntary liquidation of a shareholder's account as described under the
prospectus heading "Redemption of Shares." Subject to certain limitations, a
shareholder who has redeemed Class C Shares of the Fund may reinvest in Class C
Shares at net asset value with credit for any contingent deferred sales charge
if the reinvestment is made no more than 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 pay the lowest applicable sales charge. Quantity discounts may
be modified or terminated at any time. For more information about quantity
discounts, investors should contact their authorized dealer or the Distributor.

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

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

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

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

                                       14
<PAGE>   15

plus the current offering price of all shares of the Participating Funds
currently owned.

LETTER OF INTENT. A Letter of Intent provides an opportunity for an investor to
obtain a reduced sales charge by aggregating investments over a 13-month period
to determine the sales charge as outlined in the Class A Shares sales charge
table. The size of investment shown in the Class A Shares sales charge table
includes purchases of shares of the Participating Funds over a 13-month period
based on the total amount of intended purchases plus the value of all shares of
the Participating Funds previously purchased and still owned. An investor may
elect to compute the 13-month period starting up to 90 days before the date of
execution of a Letter of Intent. Each investment made during the period receives
the reduced sales charge applicable to the total amount of the investment goal.
The 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
expiration of the Letter of Intent to give effect to the lower sales charge.
Such adjustment in sales charge will be used to purchase additional shares for
the shareholder. 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 charges previously
paid. Such payments may be made directly to the Distributor or, if not paid, the
Distributor will liquidate sufficient escrowed shares to obtain the difference.

                            OTHER PURCHASE PROGRAMS

Purchasers of Class A Shares may be entitled to reduced or no initial sales
charges in connection with 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 investment 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.

In order to obtain these special benefits, all dividends and other distributions
from the Fund must be reinvested in additional shares and there can not be 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 such shares will not be resold except through redemption by
the Fund, by:

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

(2) Current or retired directors, officers and employees of Morgan Stanley Dean
    Witter & Co. and any of its subsidiaries; employees of an investment
    subadviser to any fund described in

                                       15
<PAGE>   16

    (1) above or an affiliate of such subadviser; and such persons' families and
    their beneficial accounts.

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

(4) Registered investment advisers who charge a fee for their services, trust
    companies and bank trust departments investing on their own behalf or on
    behalf of their clients. The Distributor may pay authorized dealers through
    which such 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 January 1, 2000, that (1) the
    total plan assets are at least $1 million 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 January 1, 2000 based on net asset
    value purchase privileges previously in effect will be qualified to purchase
    shares of the Participating Funds at net asset value. 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. For purchases on February 1, 1997 and thereafter, a commission will be
    paid on purchases 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 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,

                                       16
<PAGE>   17

    and a commission will be paid to authorized dealers who initiate and are
    responsible for such sales to each individual as follows: 1.00% on sales to
    $2 million, plus 0.80% on the next $1 million and 0.50% on the excess over
    $3 million.

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

Purchase orders made pursuant to clause (4) may be placed either through
authorized dealers as described above or directly with Investor Services by the
investment adviser, trust company or bank trust department, provided that
Investor Services receives federal funds for the purchase by the close of
business on the next business day following acceptance of the order. An
authorized dealer may charge a transaction fee for placing an order to purchase
shares pursuant to this provision or for placing a redemption order with respect
to such shares. Authorized dealers will be paid a service fee as described above
on purchases made under options (3) through (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/trustee of a
retirement plan account may involve additional fees charged by the dealer or
custodian/trustee.

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

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

Generally, a properly signed written request with any required signature
guarantee is all that is required for a redemption request to be in proper form.
In some cases, however, other additional documents may be necessary. In the case
of shareholders holding certificates, the certificates for the shares being
redeemed must be properly endorsed for transfer and must accompany the
redemption request. In the event a redemption is requested by and registered to
a corporation, partnership, trust, fiduciary, estate or other legal entity
owning shares of the Fund, generally, a copy of the corporate resolution or
other legal documentation appointing the authorized signer and certified within
the prior 120 days must accompany the redemption request. Retirement plan

                                       17
<PAGE>   18

distribution requests should be sent to the custodian/trustee to be forwarded to
Investor Services. Contact the custodian/trustee for further information.

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

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

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

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

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

                          DISTRIBUTIONS FROM THE FUND

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

                                       18
<PAGE>   19

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

The per share dividends on Class B Shares and Class C Shares may be lower than
the per share dividends on Class A Shares as a result of the higher distribution
fees and transfer agency costs applicable to such classes of shares.

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

                              SHAREHOLDER SERVICES

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

REINVESTMENT PLAN. A convenient way for investors to accumulate additional
shares is by accepting dividends and capital gain dividends in shares of the
Fund. Such shares are acquired at net asset value per share (without sales
charge) on the applicable payable date of the dividend or capital gain
dividends. Unless the shareholder instructs otherwise, the reinvestment plan is
automatic. This instruction may be made by telephone by calling (800) 341-2911
((800) 421-2833 for the hearing impaired) or by writing to Investor Services.
The investor may, on the initial account application or prior to any
declaration, instruct that dividends and/or capital gain dividends be paid in
cash, be reinvested in the Fund at the next determined net asset value, or be
invested in another Participating Fund at the next determined net asset value.

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

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

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

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

A shareholder wishing to make an exchange may do so by sending a written request
to Investor Services, by contacting the telephone transaction line at (800)
421-5684, through Fund Info(R) (automated phone system) at (800) 847-2424 or
through the internet at www.vankampen.com. A shareholder

                                       19
<PAGE>   20

automatically has these exchange privileges unless the shareholder indicates
otherwise by checking the applicable box on the account application form. Van
Kampen Investments and its subsidiaries, including Investor Services, and the
Fund employ procedures considered by them to be reasonable to confirm that
instructions communicated by telephone are genuine. Such procedures include
requiring certain personal identification information prior to acting upon
telephone instructions, tape-recording telephone communications, and providing
written confirmation of instructions communicated by telephone. If reasonable
procedures are employed, none of Van Kampen Investments, Investor Services or
the Fund will be liable for following telephone instructions which it reasonably
believes to be genuine. If the exchanging shareholder does not have an account
in the fund whose shares are being acquired, a new account will be established
with the same registration, dividend and capital gain dividend options (except
dividend diversification) and authorized dealer of record as the account from
which shares are exchanged, unless otherwise specified by the shareholder. In
order to establish a systematic withdrawal plan for the new account or reinvest
dividends from the new account into another fund, however, an exchanging
shareholder must submit a specific request. The Fund reserves the right to
reject any order to acquire its shares through exchange. In addition, the Fund
and other Participating Funds may restrict exchanges by shareholders engaged in
excessive trading by limiting or disallowing the exchange privilege to such
shareholders. For further information on these restrictions, see the Fund's
Statement of Additional Information. The Fund may modify, restrict or terminate
the exchange privilege at any time on 60 days' notice to its shareholders of any
termination or material amendment.

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

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

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 and its
subsidiaries, including Investor Services, and the Fund employ procedures
considered by them to be reasonable to confirm that instructions communicated
through the internet are genuine. Such procedures include requiring use of a
personal identification number prior to acting upon internet instructions and
providing written confirmation of instructions communicated through the
internet. If reasonable procedures are employed, none of Van Kampen Investments,
Investor Services or the Fund will be liable for following instructions received
through the internet which it reasonably believes to be genuine. If an account
has multiple owners, Investor Services may rely on the instructions of any one
owner.

                            FEDERAL INCOME TAXATION

Distributions of the Fund's investment company taxable income (consisting
generally of taxable income and net short-term capital gain) are taxable to
shareholders as ordinary income, to the extent of the Fund's earnings and
profits, whether paid in cash or reinvested in additional shares. Distributions
of the Fund's net capital gain (which is the excess of net long-term capital
gain over net short-term capital loss) as capital gain dividends, if any, are
taxable to shareholders as long-term capital gains, whether paid in cash or
reinvested in additional shares, and regardless of how long the shares of the
Fund have been held by such shareholders. The Fund expects

                                       20
<PAGE>   21

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

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

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

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

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

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

                                       21
<PAGE>   22

                              FINANCIAL HIGHLIGHTS

The financial highlights table is intended to help you understand the Fund's
financial performance for the past five years. 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 PricewaterhouseCoopers 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                               Class B Shares
                                                      Year Ended December 31,                      Year Ended December 31,
                                          1999       1998       1997       1996       1995        1999     1998(c)      1997
------------------------------------------------------------------------------------------------------------------------------
<S>                                     <C>        <C>        <C>        <C>        <C>         <C>        <C>        <C>
Net Asset Value, Beginning of the
  Period............................     $20.631    $17.414    $15.120     $13.07     $11.43     $20.075    $17.059    $14.909
                                        --------   --------   --------   --------   --------    --------   --------   --------
  Net Investment Income/Loss........       (.030)      .058       .087       .086        .08       (.154)     (.089)     (.021)
  Net Realized and Unrealized
    Gain............................       5.207      3.980      4.113      2.942     3.7325       4.993      3.881      4.017
                                        --------   --------   --------   --------   --------    --------   --------   --------

Total from Investment Operations....       5.177      4.038      4.200      3.028     3.8125       4.839      3.792      3.996
                                        --------   --------   --------   --------   --------    --------   --------   --------

Less:
  Distributions from and in Excess
    of Net Investment Income........        .004       .045       .060       .077      .0725          --         --         --
  Distributions from Net Realized
    Gain............................       3.030       .776      1.846       .901       2.10       3.030       .776      1.846
                                        --------   --------   --------   --------   --------    --------   --------   --------
Total Distribution..................       3.034       .821      1.906       .978     2.1725       3.030       .776      1.846
                                        --------   --------   --------   --------   --------    --------   --------   --------

Net Asset Value, End of the
  Period............................     $22.774    $20.631    $17.414    $15.120     $13.07     $21.884    $20.075    $17.059
                                        ========   ========   ========   ========   ========    ========   ========   ========

Total Return(a).....................      26.56%     23.56%     28.55%     23.48%     33.92%      25.54%     22.65%     27.50%
Net Assets at End of the Period (In
  millions).........................    $2,591.1   $2,137.4   $1,706.1   $1,276.9   $1,035.7    $1.020.8     $816.3     $542.2
Ratio of Expenses to Average Net
  Assets(b).........................        .91%       .94%       .93%      1.01%       .98%       1.67%      1.74%      1.75%
Ratio of Net Investment Income/Loss
  to Average Net Assets(b)..........       (.13%)      .32%       .54%       .60%       .59%       (.91%)     (.49%)     (.29%)
Portfolio Turnover..................        111%        72%        73%       110%       152%        111%        72%        73%

<CAPTION>
                                            Class B Shares                           Class C Shares
                                         Year Ended December 31,                Year Ended December 31,
                                             1996       1995        1999     1998(c)      1997       1996       1995
<S>                                        <C>        <C>         <C>        <C>        <C>        <C>        <C>      <C>
Net Asset Value, Beginning of the
  Period............................         $12.94     $11.37     $20.239    $17.191    $15.008     $13.01     $11.42
                                           --------   --------    --------   --------   --------   --------   --------
  Net Investment Income/Loss........          (.012)      (.03)      (.136)     (.090)     (.023)     (.013)      (.03)
  Net Realized and Unrealized
    Gain............................          2.882       3.70       5.020      3.914      4.052      2.912       3.72
                                           --------   --------    --------   --------   --------   --------   --------
Total from Investment Operations....          2.870       3.67       4.884      3.824      4.029      2.899       3.69
                                           --------   --------    --------   --------   --------   --------   --------
Less:
  Distributions from and in Excess
    of Net Investment Income........             --         --          --         --         --         --         --
  Distributions from Net Realized
    Gain............................           .901       2.10       3.030       .776      1.846       .901       2.10
                                           --------   --------    --------   --------   --------   --------   --------
Total Distribution..................           .901       2.10       3.030       .776      1.846       .901       2.10
                                           --------   --------    --------   --------   --------   --------   --------
Net Asset Value, End of the
  Period............................        $14.909     $12.94     $22.093    $20.239    $17.191    $15.008     $13.01
                                           ========   ========    ========   ========   ========   ========   ========
Total Return(a).....................         22.48%     32.82%      25.59%     22.65%     27.51%     22.60%     32.85%
Net Assets at End of the Period (In
  millions).........................         $305.6     $184.1      $117.9      $86.0      $56.9      $30.4      $15.7
Ratio of Expenses to Average Net
  Assets(b).........................          1.82%      1.81%       1.68%      1.74%      1.75%      1.82%      1.80%
Ratio of Net Investment Income/Loss
  to Average Net Assets(b)..........          (.21%)     (.24%)      (.90%)     (.48%)     (.29%)     (.22%)     (.23%)
Portfolio Turnover..................           110%       152%        111%        72%        73%       110%       152%
</TABLE>

(a) Total Return is based upon net asset value which does not include payment of
    maximum sales charge or contingent deferred sales charge.
(b) For the year ended December 31, 1996, the impact on the Ratios of Expenses
    and Net Investment Income to Average Net Assets due to the Adviser's
    reimbursement of certain expenses was less than 0.01%.
(c) Based on average shares outstanding.

                                       22
<PAGE>   23

                               BOARD OF TRUSTEES
                                  AND OFFICERS

                               BOARD OF TRUSTEES

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

                                    OFFICERS

Richard F. Powers, III*
President

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

A. Thomas Smith III*
Vice President and Secretary

John H. Zimmermann, III*
Vice President

Michael H. Santo*
Vice President

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

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

                              FOR MORE INFORMATION

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

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

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

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

WEB SITE
www.vankampen.com

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

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

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

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

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

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

Independent Accountants
ERNST & YOUNG LLP
233 South Wacker Drive
Chicago, IL 60606
<PAGE>   24

                                   VAN KAMPEN
                                ENTERPRISE  FUND

                                   PROSPECTUS
                                APRIL 28, 2000,
                        AS SUPPLEMENTED ON MAY 25, 2000.

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

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

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

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

                            [VAN KAMPEN FUNDS LOGO]

                                             The Fund's Investment Company Act
File No. is 811-630.
                                                                    ENT PRO 5/00


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