VAN KAMPEN AMERICAN CAPITAL COMSTOCK FUND/
497, 1998-04-28
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<PAGE>   1
 
- --------------------------------------------------------------------------------
                          VAN KAMPEN AMERICAN CAPITAL
                                 COMSTOCK FUND
- --------------------------------------------------------------------------------
 
    Van Kampen American Capital Comstock Fund (the "Fund") is a diversified,
open-end management investment company, commonly known as a mutual fund. The
Fund's investment objective is to seek capital growth and income through
investments in equity securities including common and preferred stocks and
securities convertible into common and preferred stocks. There is no assurance
that the Fund will achieve its investment objective.
 
    The Fund's investment adviser is Van Kampen American Capital Asset
Management, Inc. (the "Adviser"). This Prospectus sets forth certain information
that a prospective investor should know before investing in the Fund. Please
read it carefully and retain it for future reference. The address of the Fund is
One Parkview Plaza, Oakbrook Terrace, Illinois 60181, and its telephone number
is (800) 421-5666.
                             ---------------------
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE REGULATORS NOR HAS THE SECURITIES AND EXCHANGE
COMMISSION OR ANY STATE REGULATORS PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                             ---------------------
    SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR
ENDORSED BY, ANY BANK OR DEPOSITORY INSTITUTION; FURTHER, SUCH SHARES ARE NOT
FEDERALLY INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION, THE FEDERAL
RESERVE BOARD OR ANY OTHER GOVERNMENT AGENCY. SHARES OF THE FUND INVOLVE
INVESTMENT RISKS, INCLUDING POSSIBLE LOSS OF PRINCIPAL.
 
    A Statement of Additional Information, dated April 30, 1998, containing
additional information about the Fund is hereby incorporated in its entirety
into this Prospectus. A copy of the Statement of Additional Information may be
obtained without charge by calling (800) 421-5666 or for Telecommunications
Device for the Deaf at (800) 421-2833. The Statement of Additional Information
has been filed with the Securities and Exchange Commission ("SEC") and is
available along with other related materials at the SEC's internet web site
(http://www.sec.gov).
                               ------------------
                         VAN KAMPEN AMERICAN CAPITAL SM
 
                               ------------------
 
                    THIS PROSPECTUS IS DATED APRIL 30, 1998.
<PAGE>   2
 
- ------------------------------------------------------------------------------
                               TABLE OF CONTENTS
- ------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                PAGE
                                                                ----
<S>                                                           <C>
Prospectus Summary..........................................      3
Shareholder Transaction Expenses............................      5
Annual Fund Operating Expenses and Example..................      6
Financial Highlights........................................      8
The Fund....................................................     10
Investment Objective and Policies...........................     10
Investment Practices........................................     12
Investment Advisory Services................................     17
Alternative Sales Arrangements..............................     19
Purchase of Shares..........................................     22
Shareholder Services........................................     32
Redemption of Shares........................................     36
Distribution and Service Plans..............................     39
Distributions from the Fund.................................     41
Tax Status..................................................     42
Fund Performance............................................     46
Description of Shares of the Fund...........................     48
Additional Information......................................     49
</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 ADVISER OR THE DISTRIBUTOR. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER BY THE FUND OR BY THE 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.
 
                                        2
<PAGE>   3
 
- ------------------------------------------------------------------------------
                               PROSPECTUS SUMMARY
- ------------------------------------------------------------------------------
 
THE FUND. Van Kampen American Capital Comstock Fund (the "Fund") is a
diversified, open-end management investment company organized as a Delaware
business trust.
 
MINIMUM PURCHASE. $500 minimum initial investment for each class of shares and
$25 minimum for each subsequent investment for each class of shares (or less as
described under "Purchase of Shares").
 
INVESTMENT OBJECTIVE. The investment objective of the Fund is to seek capital
growth and income. There is no assurance that the Fund will achieve its
investment objective. See "Investment Objective and Policies."
 
INVESTMENT POLICY. The Fund seeks to achieve its investment objective by
investing in equity securities including common and preferred stocks and
securities convertible into common and preferred stocks.
 
INVESTMENT RESULTS. The investment results of the Fund are shown in the table of
"Financial Highlights."
 
ALTERNATIVE SALES ARRANGEMENTS. The Fund offers three classes of shares to the
public, each with its own sales charge structure: Class A shares, Class B shares
and Class C shares. Each class has distinct advantages and disadvantages for
different investors, and investors may choose the class of shares that best
suits their circumstances and objectives. Each class of shares represents an
interest in the same portfolio of investments of the Fund. See "Alternative
Sales Arrangements." For information on redeeming shares see "Redemption of
Shares."
 
  Class A Shares. Class A shares are offered at net asset value per share plus a
maximum initial sales charge of 5.75% of the offering price (6.10% of the net
amount invested), reduced on investments of $50,000 or more. Investments of $1
million or more are not subject to any sales charge at the time of purchase, but
a contingent deferred sales charge ("CDSC") of 1.00% may be imposed on
redemptions made within one year of purchase. Class A shares are subject to an
annual service fee of up to 0.25% of its average daily net assets attributable
to such class of shares. See "Purchase of Shares -- Class A Shares" and
"Distribution and Service Plans."
 
  Class B Shares. Class B shares are offered at net asset value per share and
are subject to a maximum CDSC of 5.00% on redemptions made within the first year
after purchase and declining thereafter to 0.00% after the fifth year. See
"Redemption of Shares." Class B shares are subject to a combined annual
distribution fee and service fee of up to 1.00% of the Fund's average daily net
assets attributable to such class of shares. See "Purchase of Shares -- Class B
Shares" and "Distribution and Service Plans." Class B shares convert
automatically to Class A shares eight years after the end of the calendar month
in which the shareholder's order to
 
                                        3
<PAGE>   4
 
purchase was accepted. See "Alternative Sales Arrangements -- Conversion
Feature."
 
  Class C Shares. Class C shares are offered at net asset value per share and
are subject to a CDSC of 1.00% on redemptions made within one year of purchase.
See "Redemption of Shares." Class C shares are subject to a combined annual
distribution fee and service fee of up to 1.00% of the Fund's average daily net
assets attributable to such class of shares. See "Purchase of Shares -- Class C
Shares" and "Distribution and Service Plans."
 
INVESTMENT ADVISER. Van Kampen American Capital Asset Management, Inc. (the
"Adviser") is the Fund's investment adviser.
 
DISTRIBUTOR. Van Kampen American Capital Distributors, Inc. (the "Distributor")
distributes the Fund's shares.
 
DISTRIBUTIONS FROM THE FUND. Dividends from net investment income are
distributed quarterly. Capital gains, if any, are distributed at least annually.
Such distributions are automatically reinvested in shares of the Fund at net
asset value per share (without a sales charge) unless payment in cash is
requested. See "Distributions from the Fund."
 
  The foregoing is qualified in its entirety by reference to the more detailed
              information appearing elsewhere in this Prospectus.
 
                                        4
<PAGE>   5
 
- ------------------------------------------------------------------------------
SHAREHOLDER TRANSACTION EXPENSES
- ------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                    CLASS A        CLASS B        CLASS C
                                    SHARES         SHARES          SHARES
                                    -------        -------        -------
<S>                                 <C>       <C>               <C>
Maximum sales charge imposed on
  purchases (as a percentage of
  offering price).................   5.75%(1)       None            None
Maximum sales charge imposed on
  reinvested dividends (as a
  percentage of offering price)...    None          None            None
Deferred sales charge (as a
  percentage of the lesser of
  original purchase price or                                        
  redemption proceeds)............    None(2)   Year 1--5.00%   Year1--1.00%
                                                Year 2--4.00%   After--None
                                                Year 3--3.00%
                                                Year 4--2.50%
                                                Year 5--1.50%
                                                 After--None
Redemption fees (as a percentage
  of amount redeemed).............    None          None            None
Exchange fee......................    None          None            None
</TABLE>
 
- ------------------------------------------------------------------------------
(1) Reduced for purchases of $50,000 and over. See "Purchase of Shares -- Class
    A Shares."
 
(2) Investments of $1 million or more are not subject to any sales charge at the
    time of purchase, but a CDSC of 1.00% may be imposed on redemptions made
    within one year of the purchase. See "Purchase of Shares -- Class A Shares."
 
                                        5
<PAGE>   6
 
- ------------------------------------------------------------------------------
ANNUAL FUND OPERATING EXPENSES AND EXAMPLE
- ------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                             CLASS A   CLASS B   CLASS C
                                             SHARES    SHARES    SHARES
                                             -------   -------   -------
<S>                                          <C>       <C>       <C>
Management Fees (as a percentage of average
  daily net assets)........................   0.48%     0.48%     0.48%
12b-1 Fees (as a percentage of average
  daily net assets)(1).....................   0.21%     1.00%(2)  1.00%(2)
Other Expenses (as a percentage of average
  daily net assets)........................   0.25%     0.26%     0.26%
Total Fund Operating Expenses (as a
  percentage of average daily net
  assets)..................................   0.94%     1.74%     1.74%
</TABLE>
 
- ------------------------------------------------------------------------------
(1) Class A shares are subject to an annual service fee of up to 0.25% of the
    average daily net assets attributable to such class of shares. Class B
    shares and Class C shares are each subject to a combined annual distribution
    and service fee of up to 1.00% of the average daily net assets attributable
    to such class of shares. See "Distribution and Service Plans."
 
(2) Long-term shareholders may pay more than the economic equivalent of the
    maximum front-end sales charges permitted as a fund-level expense by NASD
    Rules.
 
                                        6
<PAGE>   7
 
<TABLE>
<CAPTION>
                                              ONE      THREE     FIVE       TEN
                                             YEAR      YEARS     YEARS     YEARS
EXAMPLE:                                     ----      -----     -----     -----
<S>                                         <C>       <C>       <C>       <C>
You would pay the following expenses on a
  $1,000 investment, assuming (i) an
  operating expense ratio of 0.94% for
  Class A shares, 1.74% for Class B shares
  and 1.74% for Class C shares, (ii) a
  5.00% annual return and (iii) redemption
  at the end of each time period:

    Class A...............................    $67       $86      $107      $166
    Class B...............................    $68       $85      $109      $184*
    Class C...............................    $28       $55      $ 94      $205

You would pay the following expenses on
  the same $1,000 investment assuming no
  redemption at the end of each time
  period:

    Class A...............................    $67       $86      $107      $166
    Class B...............................    $18       $55      $ 94      $184*
    Class C...............................    $18       $55      $ 94      $205
</TABLE>
 
- ------------------------------------------------------------------------------
* Based on conversion to Class A shares after eight years.
 
  The purpose of the foregoing table is to assist an investor in understanding
the various costs and expenses that an investor in the Fund will bear directly
or indirectly. The "Example" reflects expenses based on the "Annual Fund
Operating Expenses" table as shown above carried out to future years and is
included to provide a means for the investor to compare expense levels of funds
with different fee structures over varying investment periods. To facilitate
such comparison, all funds are required by the SEC to utilize a 5.00% annual
return assumption. The ten year amount with respect to Class B shares of the
Fund reflects the lower aggregate 12b-1 and service fees applicable to such
shares after conversion to Class A shares. Class B shares acquired through the
exchange privilege are subject to the CDSC schedule relating to the Class B
shares of the fund from which the purchase of Class B shares was originally
made. Accordingly, future expenses as projected could be higher than those
determined in the above table if the investor's Class B shares were exchanged
from a fund with a higher CDSC. THE INFORMATION CONTAINED IN THE ABOVE TABLE
SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE EXPENSES AND ACTUAL
EXPENSES MAY BE GREATER OR LESS THAN THOSE SHOWN. For a more complete
description of such costs and expenses, see "Purchase of Shares," "Investment
Advisory Services," "Redemption of Shares" and "Distribution and Service Plans."
 
                                        7
<PAGE>   8
 
- --------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS (Selected data for a share of beneficial interest
outstanding throughout each of the periods indicated)
- --------------------------------------------------------------------------------
 
  The following financial highlights have been audited by Price Waterhouse LLP,
independent accountants, whose report thereon was unqualified. The most recent
annual report (which contains financial highlights for the last five years) is
included in the Statement of Additional Information and may be obtained by
shareholders without charge by calling the telephone number on the 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
                                            -----------------------------------------------------------------------------------
                                                                          YEAR ENDED DECEMBER 31
                                            -----------------------------------------------------------------------------------
                                               1997        1996         1995         1994        1993        1992       1991
                                            ----------  ----------  ------------  ----------  ----------  ----------  ---------
<S>                                         <C>         <C>         <C>           <C>         <C>         <C>         <C>
Net Asset Value, Beginning of the
 Period...................................     $14.785     $14.54       $12.40      $16.38      $17.30      $17.52     $14.29
                                            ----------  ----------  ------------  ----------  ----------  ----------  ---------
 Net Investment Income....................        .275        .264         .26         .31         .32         .33        .395
 Net Realized and Unrealized Gain/Loss....       3.966       2.828        4.1125      (.92)       1.18         .795      4.065
                                            ----------  ----------  ------------  ----------  ----------  ----------  ---------
Total from Investment Operations..........       4.241       3.092        4.3725      (.61)       1.50        1.125      4.46
                                            ----------  ----------  ------------  ----------  ----------  ----------  ---------
Less:
 Distributions from and in Excess of Net
   Investment Income......................        .250        .255         .27         .3225       .2975       .3275      .395
 Distributions from Net Realized Gain.....       2.572       2.592        1.9625      3.0475      2.1225      1.0175      .835
                                            ----------  ----------  ------------  ----------  ----------  ----------  ---------
Total Distributions.......................       2.822       2.847        2.2325      3.37        2.42        1.345      1.23
                                            ----------  ----------  ------------  ----------  ----------  ----------  ---------
Net Asset Value, End of the Period........     $16.204     $14.785      $14.54      $12.40      $16.38      $17.30     $17.52
                                            ==========  ==========  ============  ==========  ==========  ==========  =========
Total Return (a)..........................      29.92%      22.34%       36.16%      (3.67%)      9.09%       6.53%     31.96%
Net Assets at End of the Period (In
 millions)................................    $1,518.7    $1,240.9      $1,071.4     $871.6      $980.4      $959.0     $986.2
Ratio of Expenses to Average Net Assets
 (b)......................................        .94%       1.00%         .96%       1.01%        .96%        .87%       .82%
Ratio of Net Investment Income to Average
 Net Assets (b)...........................       1.71%       1.71%        1.82%       1.93%       1.82%       1.84%      2.32%
Portfolio Turnover........................        114%        176%         151%        136%         50%         36%        38%
Average Commission Paid Per Equity Share
 Traded (c)...............................      $.0602      $.0598          --          --          --          --         --
 
<CAPTION>
                                                     CLASS A SHARES
                                            ---------------------------------
                                                 YEAR ENDED DECEMBER 31
                                            ---------------------------------
                                               1990        1989       1988
                                            ----------  ----------  ---------
<S>                                         <C>         <C>         <C>
Net Asset Value, Beginning of the
 Period...................................    $15.29      $13.08      $11.83
                                            ----------  ----------  ---------
 Net Investment Income....................       .47         .555        .36
 Net Realized and Unrealized Gain/Loss....      (.9875)     3.4175      1.38
                                            ----------  ----------  ---------
Total from Investment Operations..........      (.5175)     3.9725      1.74
                                            ----------  ----------  ---------
Less:
 Distributions from and in Excess of Net
   Investment Income......................       .475        .54         .365
 Distributions from Net Realized Gain.....       .0075      1.2225       .125
                                            ----------  ----------  ---------
Total Distributions.......................       .4825      1.7625       .49
                                            ----------  ----------  ---------
Net Asset Value, End of the Period........    $14.29      $15.29      $13.08
                                            ==========  ==========  =========
Total Return (a)..........................     (3.36%)     30.53%      14.80%
Net Assets at End of the Period (In
 millions)................................      $812.1     $952.1     $838.9
Ratio of Expenses to Average Net Assets
 (b)......................................       .79%        .69%        .71%
Ratio of Net Investment Income to Average
 Net Assets (b)...........................      2.99%       3.41%       2.61%
Portfolio Turnover........................        30%         51%        61%
Average Commission Paid Per Equity Share
 Traded (c)...............................        --          --         --
</TABLE>
 
                               (Table and footnotes continued on following page)
 
                                        8
<PAGE>   9
 
FINANCIAL HIGHLIGHTS -- (continued)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                   CLASS B SHARES
                                   -------------------------------------------------------------------------------
                                                                                               OCTOBER 19, 1992
                                                                                                 (COMMENCEMENT
                                                   YEAR ENDED DECEMBER 31                     OF DISTRIBUTION) TO
                                   -------------------------------------------------------     DECEMBER 31, 1992
                                     1997        1996       1995       1994      1993 (D)             (D)
                                   ---------   --------   --------   --------   ----------   ---------------------
<S>                                <C>         <C>        <C>        <C>        <C>          <C>
Net Asset Value, Beginning of
 Period..........................  $   14.802  $  14.56   $  12.42   $  16.40   $    17.30         $17.62
                                   ---------   --------   --------   --------   ----------         --------
 Net Investment Income...........           .145         .144         .14         .16           .18          .03
 Net Realized and Unrealized
   Gain/Loss.....................       3.964      2.825      4.1125     (.905)       1.192           .9225
                                   ---------   --------   --------   --------   ----------         --------
Total from Investment
 Operations......................       4.109      2.969      4.2525     (.745)       1.372           .9525
                                   ---------   --------   --------   --------   ----------         --------
Less:
 Distributions from and in Excess
   of Net Investment Income......           .130         .135         .15         .1875           .1495          .29
 Distributions from Net Realized
   Gain..........................       2.572      2.592      1.9625     3.0475       2.1225          .9825
                                   ---------   --------   --------   --------   ----------         --------
Total Distributions..............       2.702      2.727      2.1125     3.235        2.272          1.2725
                                   ---------   --------   --------   --------   ----------         --------
Net Asset Value, End of the
 Period..........................  $   16.209  $  14.802  $  14.56   $  12.42   $    16.40         $17.30
                                   =========   ========   ========   ========   ==========         ========
Total Return (a).................      28.88%     21.39%     34.99%     (4.41%)       8.25%          4.66% *
Net Assets at End of the Period
 (In millions)...................  $  123.1    $  75.4    $  45.2    $  22.0    $    13.9          $ 0.8
Ratio of Expenses to Average Net
 Assets (b)......................       1.74%      1.80%      1.79%      1.84%        1.76%          1.88%
Ratio of Net Investment Income to
 Average Net Assets (b)..........           .92%         .91%         .96%     1.12%       1.04%          .74%
Portfolio Turnover ..............  114% ....       176%       151%       136%          50%                 36%
Average Commission Paid Per
 Equity Share Traded (c).........  $        .0602 $       .0598    --    --         --              --
 
<CAPTION>
                                                             CLASS C SHARES
                                   -------------------------------------------------------------------
                                                                                   OCTOBER 26, 1993
                                                                                     (COMMENCEMENT
                                             YEAR ENDED DECEMBER 31               OF DISTRIBUTION) TO
                                   -------------------------------------------     DECEMBER 31, 1993
                                     1997       1996       1995      1994 (D)             (D)
                                   --------   --------   --------   ----------   ---------------------
<S>                                <C>        <C>        <C>        <C>          <C>
Net Asset Value, Beginning of
 Period..........................  $  14.805  $  14.56   $  12.41   $    16.39         $18.16
                                   --------   --------   --------   ----------         --------
 Net Investment Income...........          .144         .151         .15           .18          .02
 Net Realized and Unrealized
   Gain/Loss.....................      3.963      2.821      4.1125       (.925)          .1425
                                   --------   --------   --------   ----------         --------
Total from Investment
 Operations......................      4.107      2.972      4.2625       (.745)          .1625
                                   --------   --------   --------   ----------         --------
Less:
 Distributions from and in Excess
   of Net Investment Income......          .130         .135         .15           .1875          .065
 Distributions from Net Realized
   Gain..........................      2.572      2.592      1.9625       3.0475         1.8675
                                   --------   --------   --------   ----------         --------
Total Distributions..............      2.702      2.727      2.1125       3.235          1.9325
                                   --------   --------   --------   ----------         --------
Net Asset Value, End of the
 Period..........................  $  16.210  $  14.805  $  14.56   $    12.41         $16.39
                                   ========   ========   ========   ==========         ========
Total Return (a).................     28.89%     21.38%     35.11%       (4.43%)         1.11% *
Net Assets at End of the Period
 (In millions)...................  $  10.9    $   5.8    $   4.1    $     2.3          $ 0.5
Ratio of Expenses to Average Net
 Assets (b)......................      1.74%      1.80%      1.79%        1.85%          1.93%
Ratio of Net Investment Income to
 Average Net Assets (b)..........          .92%         .92%         .97%       1.15%          .78%
Portfolio Turnover ..............      114%       176%       151%         136%                 50%
Average Commission Paid Per
 Equity Share Traded (c).........  $       .0602 $       .0598    --     --             --
</TABLE>
 
- ------------
 
*Non-Annualized
(a) Total Return is based upon Net Asset Value which does not include payment of
   the maximum sales charge or contingent deferred sales charge.
(b) 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) Represents the Average Brokerage Commission Paid Per Equity Share traded
   during the period for trades where commissions were applicable. This
   disclosure was not required in fiscal years prior to 1996.
(d) Based on average month-end shares outstanding.
 
                                        9
<PAGE>   10
 
- ------------------------------------------------------------------------------
THE FUND
- ------------------------------------------------------------------------------
 
  The Fund is a diversified, open-end management investment company, commonly
known as a mutual fund. A mutual fund provides, for those who have similar
investment goals, a practical and convenient way to invest in a diversified
portfolio of securities by combining their resources in an effort to achieve
such goals.
 
  Van Kampen American Capital Asset Management, Inc. (the "Adviser") provides
investment advisory and administrative services to the Fund. The Adviser or its
affiliates also act as investment advisers to other mutual funds distributed by
Van Kampen American Capital Distributors, Inc. (the "Distributor"). To obtain
prospectuses and other information on any of these other funds, please call the
telephone number on the cover page of the Prospectus.
 
- ------------------------------------------------------------------------------
INVESTMENT OBJECTIVE AND POLICIES
- ------------------------------------------------------------------------------
 
  The Fund's investment objective is to seek capital growth and income through
investments in equity securities including common and preferred stocks and
securities convertible into common and preferred stocks.
 
  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. In selecting common stocks for
investment, the Fund will focus primarily on the security's potential for income
and capital growth.
 
  The Fund may invest in preferred stock. Preferred stock generally has a
preference as to dividends and liquidation over an issuer's common stock but
ranks junior to debt securities in an issuer's capital structure. Unlike
interest payments on debt securities, preferred stock dividends are payable only
if declared by the issuer's board of directors. Preferred stock also may be
subject to optional or mandatory redemption provisions.
 
  The Fund also invests in convertible securities. A convertible security is a
bond, debenture, note, preferred stock or other security that may be converted
into or exchanged for a prescribed amount of common stock or other equity
security of the same or a different issuer within a particular period of time at
a specified price or in accordance with a specified formula. A convertible
security entitles the holder to receive interest paid or accrued on debt
securities or the dividend paid on preferred stock until the convertible
security matures or is redeemed, converted or exchanged. Before conversion,
convertible securities have characteristics similar to nonconvertible income
securities in that they ordinarily provide a stream of income with
 
                                       10
<PAGE>   11
 
generally higher yields than those of common stocks of the same or similar
issuers. Convertible securities rank senior to common stock in a corporation's
capital structure but are usually subordinated to comparable nonconvertible
securities.
 
  The Fund generally holds up to 10% of its assets in high quality short-term
debt securities and investment grade corporate or government bonds in order to
provide liquidity. Such investments may be increased up to 100% of the Fund's
assets when deemed appropriate by the Adviser for temporary defensive purposes.
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 Ratings Group
("S&P"). Securities rated Baa by Moody's or BBB by S&P are considered by the
rating agencies to be medium grade obligations which possess speculative
characteristics so that changes in economic conditions or other circumstances
are more likely to lead to a weakened capacity to make principal and interest
payments than in the case of higher rated securities. Short-term investments may
include repurchase agreements with banks or broker-dealers. See "Investment
Practices -- Repurchase Agreements."
 
  The Fund may also invest up to 15% of its total assets in securities of
foreign issuers and may invest in investment companies. See "Investment
Practices -- Securities of Foreign Issuers" and "Investment
Practices -- Investment in Investment Companies." The Fund may engage in
portfolio management strategies and techniques involving options, futures
contracts and options on futures. Options, futures contracts and related options
are described in "Investment Practices -- Options, Futures Contracts and Related
Options" and the Statement of Additional Information.
 
  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 with respect to the Fund. An investment in the Fund is
intended to be a long-term investment and should not be used as a trading
vehicle.
 
  Like other mutual funds, financial and business organizations and individuals
around the world, the Fund could be adversely affected if the computer systems
used by the Fund's Adviser and other service providers do not properly process
and calculate date-related information and data from and after January 1, 2000.
This is commonly known as the "Year 2000 Problem." The Adviser is taking steps
that it believes are reasonably designed to address the Year 2000 Problem with
respect to computer systems that it uses and to obtain reasonable assurances
that comparable steps are being taken by the Fund's other major service
providers. At this time, there can be no assurance that these steps will be
sufficient to avoid any adverse impact to the Fund. In addition, the Year 2000
Problem may adversely affect the issuers of securities in which the Fund may
invest which, in turn, may adversely affect the net asset value of the Fund.
                                       11
<PAGE>   12
 
- ------------------------------------------------------------------------------
INVESTMENT PRACTICES
- ------------------------------------------------------------------------------
 
  REPURCHASE AGREEMENTS. The Fund may enter into repurchase agreements with
banks or broker-dealers in order to earn a return on temporarily available cash.
A repurchase agreement is a short-term investment in which the purchaser (i.e.,
the Fund) acquires ownership of a debt security and the seller agrees to
repurchase the obligation at a future time and set price, thereby determining
the yield during the holding period. Repurchase agreements involve certain risks
in the event of default by the other party. The Fund will not invest in
repurchase agreements that do not mature within seven days if any such
investment, together with any other illiquid securities held by the Fund,
exceeds 10% of the value of its net assets. In the event of a bankruptcy or
other default of a seller of a repurchase agreement, the Fund could experience
delays in liquidating the underlying securities and loss including: (a) possible
decline in the value of the underlying security during the period while the Fund
seeks to enforce its rights thereto, (b) possible lack of access to income on
the underlying security during this period and (c) expenses of enforcing its
rights.
 
  For the purpose of investing in repurchase agreements, the Adviser may
aggregate the cash that certain funds advised or subadvised by the Adviser or
certain of its affiliates would otherwise invest separately into a joint
account. The cash in the joint account is then invested in repurchase agreements
and the funds that contributed to the joint account share pro rata in the net
revenue generated. The Adviser believes that the joint account produces
efficiencies and economies of scale that may contribute to reduced transaction
costs, higher returns, higher quality investments and greater diversity of
investments for the Fund than would be available to the Fund investing
separately. The manner in which the joint account is managed is subject to
conditions set forth in an SEC exemptive order authorizing this practice, which
conditions are designed to ensure the fair administration of the joint account
and to protect the amounts in that account.
 
  USING OPTIONS, FUTURES CONTRACTS AND RELATED OPTIONS. The Fund expects to
utilize options, futures contracts and options thereon in several different
ways, depending upon the status of the Fund's portfolio and the Adviser's
expectations concerning the securities markets.
 
  In times of stable or rising stock prices, the Fund generally seeks to be
fully invested in the equity securities markets. 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 equivalents
does not fluctuate with security market prices, so that, in times of rising
market prices, the Fund may underperform the market in proportion to the amount
of cash equivalents in its portfolio. By purchasing stock index futures
contracts, however, the Fund can compensate for the
 
                                       12
<PAGE>   13
 
cash portion of its assets and may obtain performance equivalent to investing
100% of its assets in equity securities.
 
  If the 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.
 
  As an alternative to selling futures contracts, the Fund can purchase puts (or
futures puts) to hedge the portfolio's risk in a declining market. Since the
value of a put increases as the underlying security declines below a specified
level, the 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.
 
  The Fund is authorized to purchase and sell over-the-counter options ("OTC
Options"). OTC Options are purchased from or sold to securities dealers,
financial institutions of other parties ("Counterparties") through direct
bilateral agreement with the Counterparty. The Fund will sell only OTC Options
(other than OTC currency options) that are subject to a buy-back provision
permitting the Fund to require to the Counterparty to sell the option back to
the Fund at a formula price within seven days. The staff of the SEC currently
takes the position that, in general, OTC Options on securities other than U.S.
Government securities purchased by the Fund, and portfolio securities covering
OTC Options sold by the Fund, are illiquid securities subject to the Fund's
limitation on investing in illiquid securities as described below.
 
  POTENTIAL RISKS OF OPTIONS, FUTURES CONTRACTS AND RELATED OPTIONS. 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, the purchase and sale of options, futures
contracts and related options involve risks different from those involved with
direct investments in underlying securities. While utilization of options,
futures contracts and similar instruments may be advantageous to the Fund, if
the Adviser is not successful in employing such instruments in managing the
Fund's investments, the Fund's
                                       13
<PAGE>   14
 
performance will be worse than if the Fund did not make such investments. In
addition, the Fund would pay commissions and other costs in connection with such
investments, which may increase the Fund's expenses and reduce its return.
 
  In order to prevent leverage in connection with the purchase of futures
contracts by the Fund, an amount of cash or liquid securities equal to the
market value of the obligation under the futures contracts (less any related
margin deposits) will be maintained in a segregated account with the Custodian.
The Fund may not invest more than 10% of its net assets in illiquid securities,
including certain OTC Options deemed illiquid and repurchase agreements which
have a maturity of longer than seven days. A more complete discussion of the
potential risks involved in transactions in options, futures contracts and
related options is contained in the Statement of Additional Information.
 
  FOREIGN SECURITIES. The Fund may invest up to 15% of its total assets in
securities of foreign governments and companies. Such securities may be subject
to foreign government taxes which would reduce the income yield on such
securities. Foreign investments involve certain risks, such as political or
economic instability of the issuer or of the country of issue, the difficulty of
predicting international trade patterns, fluctuating exchange rates and the
possibility of imposition of exchange controls. Such securities may also be
subject to greater fluctuations in price than securities of domestic
corporations or of the United States Government. In addition, there may be less
publicly available information about a foreign company than about a domestic
company. Foreign companies generally are not subject to uniform accounting,
auditing and financial reporting standards comparable to those applicable to
domestic companies. There is generally less government regulation of stock
exchanges, brokers and listed companies abroad than in the United States, and,
with respect to certain foreign countries, there is a possibility of
expropriation or confiscatory taxation, or diplomatic developments which could
affect investment in those countries. Finally, in the event of a default on any
such foreign debt obligations, it may be more difficult for the Fund to obtain
or to enforce a judgment against the issuers of such securities.
 
  PORTFOLIO TURNOVER. The Fund purchases securities which are believed by the
Adviser to have above average potential for capital appreciation. Common stocks
are disposed of in situations where it is believed that potential for such
appreciation has lessened or that other common stocks have a greater potential.
Therefore, the Fund may purchase and sell securities without regard to the
length of time the security is to be or has been held. The Fund's annual
portfolio turnover rate is shown in the table of "Financial Highlights." The
rate may exceed 100% in any given year, which is higher than that of many other
investment companies. A 100% turnover rate occurs, for example, if all the
Fund's portfolio securities are replaced during one year. High portfolio
activity increases the Fund's transaction costs, including brokerage
commissions, and may result in the realization of more
 
                                       14
<PAGE>   15
 
short-term capital gains than if the Fund had lower portfolio turnover. To the
extent short-term trading results in realization of gains on securities held one
year or less, shareholders are subject to taxes at ordinary income rates. The
turnover rate will not be a limiting factor, however, if the Adviser deems
portfolio changes appropriate.
 
  PORTFOLIO TRANSACTIONS AND BROKERAGE PRACTICES. The Adviser is responsible for
the placement of orders for the purchase and sale of portfolio securities for
the Fund and the negotiation of brokerage commissions on such transactions.
Brokerage firms are selected on the basis of their professional capability for
the type of transaction and the value and quality of execution services rendered
on a continuing basis. The Adviser may place portfolio transactions, to the
extent permitted by law, with brokerage firms affiliated with the Fund, the
Adviser or the Distributor and with Firms participating in the distribution of
shares of the Fund if it reasonably believes that the quality of the execution
and the commission are comparable to that available from other qualified firms.
The Adviser is authorized to pay higher commissions to brokerage firms that
provide it with investment and research information than to firms which do not
provide such services if the Adviser determines that such commissions are
reasonable in relation to the overall services provided. The information
received may be used by the Adviser in managing the assets of other advisory
accounts as well as in the management of the assets of the Fund.
 
  INVESTMENT IN INVESTMENT COMPANIES. The Fund may invest in one or more
investment companies advised by the Adviser and its affiliates, including Van
Kampen American Capital Small Capitalization Fund ("Small Cap Fund") and Van
Kampen American Capital Foreign Securities Fund ("Foreign Securities Fund"). The
shares of the Small Cap Fund and Foreign Securities Fund are available for
investment only by certain Van Kampen American Capital funds. The Adviser
believes that the use of the Small Cap Fund and Foreign Securities Fund may,
from time to time, provide the Fund with the most effective exposure to the
performance of the small capitalization sector of the stock market and to
foreign securities while at the same time minimizing costs. The advisers charge
no advisory fees for managing the Small Cap Fund or Foreign Securities Fund, nor
are there any sales load or other charges associated with distribution of its
shares. Other expenses incurred by the Small Cap Fund and Foreign Securities
Fund are borne by them, and thus indirectly by the Van Kampen American Capital
funds that invest in them. With respect to such other expenses, the Adviser
anticipates that the efficiencies resulting from use of the Small Cap Fund or
the Foreign Securities Fund will result in cost savings for the Fund and other
Van Kampen American Capital funds. In large part, these savings are attributable
to the fact that administrative actions that would have to be performed multiple
times if each Van Kampen American Capital fund held its own portfolio of small
capitalization or foreign securities will need to be performed only once. The
Adviser expects that the Small Cap Fund and Foreign Securities Fund will
experience trading costs that will
                                       15
<PAGE>   16
 
be substantially less than the trading costs that would be incurred if small
capitalization or foreign securities were purchased separately for the Fund and
other Van Kampen American Capital funds. The Fund's investment in the Small Cap
Fund and the Foreign Securities Fund is subject to the terms and conditions set
forth in the SEC exemptive orders authorizing such investments.
 
  The securities of small and medium sized companies that the Small Cap Fund may
invest in may be subject to more abrupt or erratic market movements than
securities of larger, more established companies or the market averages in
general. In addition, small capitalization companies typically are subject to a
greater degree of change in earnings and business prospects than are larger,
more established companies. In light of these characteristics of small
capitalization companies and their securities, the Small Cap Fund may be subject
to greater investment risk than that assumed through investment in the equity
securities of larger capitalization companies. The securities of foreign issuers
that the Foreign Securities Fund may invest in are subject to certain risks as
described under "Investment Practices -- Foreign Securities."
 
  For purposes of reviewing the Fund's portfolio diversification, the Fund will
be deemed to own a pro rata portion of each investment of the Small Cap Fund and
Foreign Securities Fund. For example, if the Fund's investment in the Small Cap
Fund were $10 million, and the Small Cap Fund had 5% of its assets invested in
the electronics industry, the Fund would be considered to have an investment of
$500,000 in the electronics industry.
 
  INVESTMENT RESTRICTIONS. The Fund has adopted certain fundamental investment
restrictions which, like the investment objective, may not be changed without
approval by a vote of a majority of the outstanding voting shares of the Fund
(as defined in the Investment Company Act of 1940, as amended (the "1940 Act")).
These restrictions provide, among other things that the Fund may not:
 
  1.  Invest more than 25% of its total net asset value in any one industry,
      except that the Fund may purchase securities of other investment companies
      to the extent permitted by (i) the 1940 Act, as amended from time to time,
      (ii) the rules and regulations promulgated by the SEC under the 1940 Act,
      as amended from time to time, or (iii) an exemption or other relief from
      the provisions of the 1940 Act.
 
  2.  Purchase a restricted security or a security for which market quotations
      are not readily available if as a result of such purchase more than 5% of
      the Fund's assets would be invested in such securities, except that the
      Fund may purchase securities of other investment companies to the extent
      permitted by (i) the 1940 Act, as amended from time to time, (ii) the
      rules and regulations promulgated by the SEC under the 1940 Act, as
      amended from
 
                                       16
<PAGE>   17
 
      time to time, or (iii) an exemption or other relief from the provisions of
      the 1940 Act.
 
  In addition to the foregoing, the Fund has adopted additional investment
restrictions which may be changed by the Trustees without a vote of
shareholders. These restrictions provide that the Fund may not:
 
  1.  Invest in the securities of a foreign issuer if, at the time of
      acquisition, more than 15% of the value of the Fund's total assets would
      be invested in securities of foreign issuers.
 
  2.  Invest more than 10% of its net assets (determined at the time of
      investment) in illiquid securities and repurchase agreements that have a
      maturity of longer than seven days.
 
- ------------------------------------------------------------------------------
INVESTMENT ADVISORY SERVICES
- ------------------------------------------------------------------------------
 
  THE ADVISER. The Adviser is a wholly-owned subsidiary of Van Kampen American
Capital, Inc. ("Van Kampen American Capital"). Van Kampen American Capital is a
diversified asset management company with more than two million retail investor
accounts, extensive capabilities for managing institutional portfolios, and more
than $60 billion under management or supervision. Van Kampen American Capital's
more than 50 open-end and 38 closed-end funds and more than 2,500 unit
investment trusts are professionally distributed by leading financial advisers
nationwide. Van Kampen American Capital Distributors, Inc., the Distributor of
the Fund and the sponsor of the funds mentioned above, is also a wholly-owned
subsidiary of Van Kampen American Capital. Van Kampen American Capital is an
indirect wholly-owned subsidiary of Morgan Stanley Dean Witter & Co. The
Adviser's principal office is located at One Parkview Plaza, Oakbrook Terrace,
Illinois 60181.
 
  Morgan Stanley Dean Witter & Co. and various of its directly or indirectly
owned subsidiaries, including Morgan Stanley Asset Management, Inc., an
investment adviser, Morgan Stanley & Co. Incorporated, a registered
broker-dealer and investment adviser, and Morgan Stanley International, are
engaged in a wide range of financial services. Their principal businesses
include securities underwriting, distribution and trading; merger, acquisition,
restructuring and other corporate finance advisory activities; merchant banking;
stock brokerage and research services; credit services; asset management;
trading of futures, options, foreign exchange, commodities and swaps (involving
foreign exchange, commodities, indices and interest rates); real estate advice,
financing and investing; and global custody, securities clearance services and
securities lending.
 
  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.
 
                                       17
<PAGE>   18
 
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>               
     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>
 
Under the Advisory Agreement, the Fund also reimburses the Adviser for the cost
of the Fund's accounting services, which include maintaining its financial books
and records and calculating its daily net asset value. Operating expenses paid
by the Fund include service fees, distribution fees, custodian fees, legal and
accounting fees, the costs of reports and proxies to shareholders, trustees'
fees (other than those who are affiliated persons, as defined in the 1940 Act,
of the Adviser, Distributor ACCESS, Van Kampen American Capital or Morgan
Stanley Dean Witter & Co.), and all other business expenses not specifically
assumed by the Adviser. Advisory (management) fees and total operating expense
ratios are shown under the caption "Annual Fund Operating Expenses and Example"
herein.
 
  From time to time the Adviser or Distributor may voluntarily undertake to
reduce the Fund's expenses by reducing the fees payable to them to the extent
of, or bearing expenses in excess of, such limitations as they may establish.
 
  The Adviser may utilize, at its own expense, credit analysis, research and
trading support services provided by its affiliate, Van Kampen American Capital
Investment Advisory Corp. ("Advisory Corp.").
 
  PERSONAL INVESTMENT POLICIES. The Fund and the Adviser have adopted Codes of
Ethics designed to recognize the fiduciary relationship between the Fund and the
Adviser and its employees. The Codes permit directors, trustees, officers and
employees to buy and sell securities for their personal accounts subject to
certain restrictions. Persons with access to certain sensitive information are
subject to pre-clearance and other procedures designed to prevent conflicts of
interest.
 
  PORTFOLIO MANAGEMENT. The Fund is managed by a management team headed by B.
Robert Baker. Mr. Baker has been primarily responsible for managing the Fund's
investment portfolio since July 1994. Mr. Baker has been Vice President and
Portfolio Manager of the Adviser and Advisory Corp. since June 1995. Prior to
that time, Mr. Baker was Associate Portfolio Manager of the Adviser. Jason Leder
and Edia Terreson are responsible as co-managers for the day-to-day management
of the Fund's investment portfolio. Mr. Leder has been Assistant Vice President
of the Adviser and Advisory Corp. since October 1996. Prior to that time, Mr.
Leder was Associate Portfolio Manager of the Adviser. Prior to February 1995,
Mr. Leder was
 
                                       18
<PAGE>   19
 
a Securities Analyst with Salomon Brothers, Inc. Prior to August 1992, Mr. Leder
was a Securities Analyst with Fidelity Management and Research. Ms. Terreson has
been Assistant Vice President of the Adviser and Advisory Corp. since December
1997. Prior to that time, Ms. Terreson was Associate Portfolio Manager of the
Adviser. Prior to March 1997, Ms. Terreson was a Securities Analyst and
Associate Portfolio Manager with Delaware Investment Advisers. Prior to May
1996, Ms. Terreson was a Securities Analyst and Associate Portfolio Manager with
J.W. Seligman & Co.
- ------------------------------------------------------------------------------
ALTERNATIVE SALES ARRANGEMENTS
- ------------------------------------------------------------------------------
 
  The Alternative Sales Arrangements permits an investor to choose the method of
purchasing shares of the Fund that is most beneficial given the amount of the
purchase and the length of time the investor expects to hold the shares.
 
  CLASS A SHARES. Class A shares are sold at net asset value plus an initial
maximum sales charge of up to 5.75% of the offering price (6.10% of the net
amount invested), reduced on investments of $50,000 or more. Investments of $1
million or more are not subject to any sales charge at the time of purchase, but
a CDSC of 1.00% may be imposed on certain redemptions made within one year of
the purchase. Class A shares are subject to an ongoing service fee at an annual
rate of up to 0.25% of the Fund's aggregate average daily net assets
attributable to the Class A shares. Certain purchases of Class A shares qualify
for reduced initial sales charges. See "Purchase of Shares -- Class A Shares."
 
  CLASS B SHARES. Class B shares are sold at net asset value and are subject to
a deferred sales charge if redeemed within five years of purchase. Class B
shares are subject to an ongoing service fee at an annual rate of up to 0.25% of
the Fund's aggregate average daily net assets attributable to the Class B shares
and an ongoing distribution fee at an annual rate of up to 0.75% of the Fund's
aggregate average daily net assets attributable to the Class B shares. Class B
shares enjoy the benefit of permitting all of the investor's dollars to work
from the time the investment is made. The ongoing distribution fee paid by Class
B shares will cause such shares to have a higher expense ratio and to pay lower
dividends than those related to Class A shares. Class B shares convert
automatically to Class A shares eight years after the end of the calendar month
in which the shareholder's order to purchase was accepted. See "Purchase of
Shares -- Class B Shares."
 
  CLASS C SHARES. Class C shares are sold at net asset value and are subject to
a deferred sales charge if redeemed within one year of purchase. Class C shares
are subject to an ongoing service fee at an annual rate of up to 0.25% of the
Fund's aggregate average daily net assets attributable to the Class C shares and
an ongoing distribution fee at an annual rate of up to 0.75% of the Fund's
aggregate average daily net assets attributable to the Class C shares. Class C
shares enjoy the benefit
 
                                       19
<PAGE>   20
 
of permitting all of the investor's dollars to work from the time the investment
is made. The ongoing distribution fee paid by Class C shares will cause such
shares to have a higher expense ratio and to pay lower dividends than those
related to Class A shares. See "Purchase of Shares -- Class C Shares."
 
  CONVERSION FEATURE. Class B shares purchased on or after June 1, 1996, and any
dividend reinvestment plan shares received thereon, 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, and any
dividend reinvestment plan shares received thereon, automatically convert to
Class A shares six years after the end of the calendar month in which the shares
were purchased. Class C shares purchased before January 1, 1997, and any
dividend reinvestment plan shares received thereon, 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 acquired through the
exchange privilege is determined by reference to the Participating Fund (defined
below) from which such share was originally purchased.
 
  The conversion of such shares to Class A shares is subject to the continuing
availability of an opinion of counsel to the effect that (i) the assessment of
the higher distribution fee and transfer agency costs with respect to such
shares does not result in the Fund's dividends or distributions constituting
"preferential dividends" under the Internal Revenue Code of 1986, as amended
(the "Code"), 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.
 
  FACTORS FOR CONSIDERATION. In deciding which class of shares to purchase,
investors should take into consideration their investment goals, present and
anticipated purchase amounts, time horizons and temperaments. Investors should
consider whether, during the anticipated life of their investment in the Fund,
the higher aggregate fees and CDSC on Class B shares and Class C shares would be
less than the initial sales charge on Class A shares purchased at the same time,
and to what extent such differential would be offset by the higher dividends per
share on Class A shares. To assist investors in making this determination, the
table under the caption "Annual Fund Operating Expenses and Example" sets forth
examples of the charges applicable to each class of shares. In this regard,
Class A shares may be more beneficial to the investor who qualifies for reduced
initial sales charges or purchases shares at net asset value. It is presently
the policy of the Distributor not to accept any order of $500,000 or more for
Class B shares or any order of $1
 
                                       20
<PAGE>   21
 
million or more for Class C shares as it ordinarily would be more beneficial for
such an investor to purchase Class A shares.
 
  Class A shares are not subject to an ongoing distribution fee and,
accordingly, receive correspondingly higher dividends per share. However,
because initial sales charges are deducted at the time of purchase for accounts
under $1 million, investors in Class A shares do not have all their funds
invested initially and, therefore, initially own fewer shares. Other investors
might determine that it is more advantageous to purchase either Class B shares
or Class C shares and have all their funds invested initially, although
remaining subject to a CDSC. Ongoing distribution fees on Class B shares and
Class C shares may be offset to the extent of the additional funds originally
invested and any return realized on those funds. However, there can be no
assurance as to the return, if any, which will be realized on such additional
funds. For investments held for ten years or more, the relative value upon
liquidation of the three classes tends to favor Class A shares or Class B
shares, rather than Class C shares.
 
  Class A shares may be appropriate for investors who prefer to pay the sales
charge up front, want to take advantage of the reduced sales charges available
on larger investments, wish to maximize their current income from the start,
prefer not to pay redemption charges or have a longer-term investment horizon.
Class B shares may be appropriate for investors who wish to avoid a front-end
sales charge, put 100% of their investment dollars to work immediately or have a
longer-term investment horizon. Class C shares may be appropriate for investors
who wish to avoid a front-end sales charge, put 100% of their investment dollars
to work immediately, have a shorter-term investment horizon or desire a short
CDSC schedule.
 
  The distribution expenses incurred by the Distributor in connection with the
sale of the shares will be reimbursed, in the case of Class A shares, from the
proceeds of the initial sales charge and, in the case of Class B shares and
Class C shares, from the proceeds of the ongoing distribution fee and any CDSC
incurred upon redemption within five years or one year, respectively, of
purchase. Sales personnel of broker-dealers distributing the Fund's shares and
other persons entitled to receive compensation for selling such shares may
receive differing compensation for selling such shares. INVESTORS SHOULD
UNDERSTAND THAT THE PURPOSE AND FUNCTION OF THE CDSC AND ONGOING DISTRIBUTION
FEE WITH RESPECT TO THE CLASS B SHARES AND CLASS C SHARES ARE THE SAME AS THOSE
OF THE INITIAL SALES CHARGE WITH RESPECT TO CLASS A SHARES. See "Distribution
and Service Plans."
 
  GENERAL. Dividends paid by the Fund with respect to Class A shares, Class B
shares and Class C shares will be calculated in the same manner at the same time
on the same day, except that the higher distribution fees and transfer agency
costs relating to Class B shares or Class C shares will be borne by the
respective class. See "Distributions from the Fund." Shares of the Fund may be
exchanged, subject
                                       21
<PAGE>   22
 
to certain limitations, for shares of the same class of certain other mutual
funds advised by the Adviser and its affiliates and distributed by the
Distributor. See "Shareholder Services -- Exchange Privilege."
 
- ------------------------------------------------------------------------------
PURCHASE OF SHARES
- ------------------------------------------------------------------------------
 
  The Fund offers three classes of shares to the public on a continuous basis
through the Distributor as principal underwriter, which is located at One
Parkview Plaza, Oakbrook Terrace, Illinois 60181. Shares also are offered
through members of the National Association of Securities Dealers, Inc. ("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").
The term "dealers" and "brokers" are sometimes referred to herein as "authorized
dealers."
 
  Initial investments must be at least $500 for each class of shares, and
subsequent investments must be at least $25 for each class of shares. Both
minimums may be waived by the Distributor for plans involving periodic
investments. Shares of the Fund may be sold in foreign countries where
permissible. 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 may be purchased on any business day through authorized dealers. Shares
also may be purchased by completing the application accompanying this Prospectus
and forwarding the application, through the authorized dealer, to the
shareholder service agent, ACCESS Investor Services, Inc. ("ACCESS"), a wholly-
owned subsidiary of Van Kampen American Capital. When purchasing shares of the
Fund, investors must specify whether the purchase is for Class A shares, Class B
shares or Class C shares.
 
  Shares are offered at the next determined net asset value per share, plus a
front-end or deferred sales charge depending on the class of shares chosen by
the investor, as shown in the tables herein. Net asset value per share for each
class 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. Net asset value per share for each class is determined by
dividing the value of the Fund's 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.
 
  Securities, including options, listed or traded on a national securities
exchange are valued at the last sale price. Unlisted securities and listed
securities for which the last sale price is not available are valued at the mean
between the last reported bid and asked price. Securities for which market
quotations are not readily available
 
                                       22
<PAGE>   23
 
and other assets are valued at fair value as determined in good faith by the
Adviser based on procedures approved by the Trustees of the Fund. Short-term
securities are valued in the manner described in the notes to the financial
statements included in the Statement of Additional Information.
 
  Generally, the net asset values per share of the Class A shares, Class B
shares and Class C shares are expected to be substantially the same. Under
certain circumstances, however, the per share net asset values of the Class A
shares, Class B shares and Class C shares may differ from one another,
reflecting the daily expense accruals of the higher distribution fee and
transfer agency costs applicable with respect to the Class B shares and Class C
shares and the differential in the dividends paid on the classes of shares. The
price paid for shares purchased is based on the next calculation of the net
asset value (plus sales charges, where applicable) after an order 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. Orders received by
authorized dealers after the close of the Exchange are priced based on the next
close provided they are received by the Distributor prior to the Distributor's
close of business on such day. It is the responsibility of authorized dealers to
transmit orders received by them to the Distributor so they will be received
prior to such time. Orders of less than $500 are mailed by the authorized dealer
and processed at the offering price next calculated after acceptance by ACCESS.
 
  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 B shares
and Class C shares bear the expenses of the deferred sales arrangement and any
expenses (including the higher distribution fee and transfer agency costs)
resulting from such sales arrangement, (ii) generally, each class has exclusive
voting rights with respect to approvals of the Rule 12b-1 distribution plan
pursuant to which its distribution fee or service fee is paid, (iii) each class
of shares has different exchange privileges, (iv) certain classes of shares are
subject to a conversion feature and (v) certain classes of shares have different
shareholder service options available. The net income attributable to Class B
shares and Class C shares and the dividends payable on Class B shares and Class
C shares will be reduced by the amount of the distribution fee and other
expenses associated with such shares. Sales personnel of authorized dealers
distributing the Fund's shares and other persons entitled to receive
compensation for selling such shares may receive differing compensation for
selling Class A shares, Class B shares or Class C shares.
 
  The Distributor may from time to time implement programs under which an
authorized dealer's sales force may be eligible to win nominal awards for
certain sales efforts or under which the Distributor will reallow to any
authorized dealer that sponsors sales contests or recognition programs
conforming to criteria established by the Distributor, or participates in sales
programs sponsored by the Distributor, an amount not exceeding the total
applicable sales charges on the sales
 
                                       23
<PAGE>   24
 
generated by the authorized dealer at the public offering price during such
programs. Other programs provide, among other things and subject to certain
conditions, for certain favorable distribution arrangements for shares of the
Fund. Also, the Distributor in its discretion may from time to time, pursuant to
objective criteria established by the Distributor, pay fees to, and sponsor
business seminars for, qualifying authorized dealers for certain services or
activities which are primarily intended to result in sales of shares of the
Fund. Fees may include payment for travel expenses, including lodging, incurred
in connection with trips taken by invited registered representatives and members
of their families to locations within or outside of the United States for
meetings or seminars of a business nature. In some instances additional
compensation or promotional incentives may be offered to brokers, dealers or
financial intermediaries that have sold or may sell significant amounts of
shares during specified periods of time. All of the foregoing payments are made
by the Distributor out of its own assets. Such fees paid for such services and
activities with respect to the Fund will not exceed in the aggregate 1.25% of
the average total daily net assets of the Fund on an annual basis. These
programs will not change the price an investor will pay for shares or the amount
that the Fund will receive from such sale.
 
CLASS A SHARES
 
  The public offering price of Class A shares is the net asset value plus a
sales charge, as set forth below.
 
SALES CHARGE TABLE
 
<TABLE>
<CAPTION>
                                                                            REALLOWED
                                                             AS % OF       TO DEALERS
                 SIZE OF                      AS % OF       NET AMOUNT     (AS A % OF
               INVESTMENT                  OFFERING PRICE    INVESTED    OFFERING PRICE)
<S>                                        <C>             <C>           <C>
- ----------------------------------------------------------------------------------------
Less than $50,000........................      5.75%          6.10%          5.00%
$50,000 but less than $100,000...........      4.75%          4.99%          4.00%
$100,000 but less than $250,000..........      3.75%          3.90%          3.00%
$250,000 but less than $500,000..........      2.75%          2.83%          2.25%
$500,000 but less than $1,000,000........      2.00%          2.04%          1.75%
$1,000,000 or more*......................        *              *              *
- ----------------------------------------------------------------------------------------
</TABLE>
 
  * No sales charge is payable at the time of purchase on investments of $1
    million or more, although for such investments the Fund imposes a CDSC of
    1.00% on redemptions made within one year of the purchase. A commission
    will be paid to authorized dealers who initiate and are responsible for
    purchases of $1 million or more 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.
 
                                       24
<PAGE>   25
 
  In addition to the reallowances from the applicable public offering price
described herein, the Distributor may, from time to time, pay or allow
additional reallowances or promotional incentives, in the form of cash or other
compensation, to authorized dealers that sell shares of the Fund. Authorized
dealers which are reallowed all or substantially all of the sales commissions
may be deemed to be underwriters for purposes of the Securities Act of 1933, as
amended.
 
  The Distributor may also pay financial institutions (which may include banks)
and other industry professionals that provide services to facilitate
transactions in shares of the Fund for their clients a transaction fee up to the
level of the reallowance allowable to authorized dealers described herein. Such
financial institutions, other industry professionals and authorized dealers are
hereinafter referred to as "Service Organizations." Banks are currently
prohibited from providing certain underwriting or distribution services. If
banking firms were prohibited from acting in any capacity or providing any of
the described services, the Distributor would consider what action, if any,
would be appropriate. The Distributor does not believe that termination of a
relationship with a bank would result in any material adverse consequences to
the Fund. State securities laws regarding registration of banks and other
financial institutions may differ from the interpretations of federal law
expressed herein, and banks and other financial institutions may be required to
register as dealers pursuant to certain state laws.
 
QUANTITY DISCOUNTS
 
  Investors purchasing Class A shares may under certain circumstances be
entitled to pay reduced sales charges. The circumstances under which such
investors may pay reduced sales charges are described below.
 
  Investors, or their authorized dealers, must notify the Fund at the time of
the purchase order whenever a quantity discount is applicable to purchases. Upon
such notification, an investor will receive the lowest applicable sales charge.
Quantity discounts may be modified or terminated at any time. For more
information about quantity discounts, investors should contact their authorized
dealer or the Distributor.
 
  A person eligible for a reduced sales charge includes an individual, his or
her spouse and children under 21 years of age and any corporation, partnership
or sole proprietorship which is 100% owned, either alone or in combination, by
any of the foregoing; a trustee or other fiduciary purchasing for a single trust
or for a single fiduciary account, or a "company" as defined in Section 2(a)(8)
of the 1940 Act.
 
  As used herein, "Participating Funds" refers to certain open-end investment
companies advised by the Adviser or Advisory Corp. and distributed by the
Distributor as determined from time to time by the Fund's Board of Trustees.
 
                                       25
<PAGE>   26
 
  Volume Discounts. The size of investment shown in the preceding 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 preceding
sales charge table may also be determined by combining the amount being invested
in shares of the Participating Funds plus the current offering price of all
shares of the Participating Funds which have been previously purchased and are
still owned.
 
  Letter of Intent. A Letter of Intent provides an opportunity for an investor
to obtain a reduced sales charge by aggregating the investments over a
thirteen-month period to determine the sales charge as outlined in the preceding
sales charge table. The size of investment shown in the preceding sales charge
table also includes purchases of shares of the Participating Funds over a
thirteen-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 thirteen-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. If the goal is not achieved within the period,
the investor must pay the difference between the sales charges applicable to the
purchases made and the sales charges previously paid. 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 back-dating
provisions, an adjustment will be made at the expiration of the Letter of Intent
to give effect to the lower charge. Such adjustments in sales charge will be
used to purchase additional shares for the shareholder at the applicable
discount category. Additional information is contained in the application form
accompanying this Prospectus.
 
OTHER PURCHASE PROGRAMS
 
  Purchasers of Class A shares may be entitled to reduced initial sales charges
in connection with unit investment trust reinvestment programs 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 Programs.  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 and with no minimum initial or subsequent
investment requirement if the administrator of an investor's unit investment
trust program meets certain uniform criteria relating to cost savings by the
Fund and the Distributor. The total sales charge for all other investments made
from unit trust
                                       26
<PAGE>   27
 
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 applicable terms
and conditions thereof, 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 ACCESS with appropriate backup data
for each participating investor in a computerized format fully compatible with
ACCESS' processing system.
 
  As further requirements for obtaining these special benefits, the Fund also
requires that all dividends and other distributions by the Fund be reinvested in
additional shares without any systematic withdrawal program. There will be no
minimum for reinvestments from unit investment trusts. The Fund will send
account activity statements to such participants on a monthly basis only, even
if their investments are made more frequently. The Fund reserves the right to
modify or terminate this program at any time.
 
  NAV Purchase Options. Class A shares of the Fund may be purchased at net asset
value, upon written assurance that the purchase is made for investment purposes
and that the shares will not be resold except through redemption by the Fund by:
 
  (1) Current or retired trustees or directors of funds advised by the Adviser
      or Advisory Corp. and such persons' families and their beneficial
      accounts.
 
  (2) Current or retired directors, officers and employees of Morgan Stanley
      Group Inc. and any of its subsidiaries, employees of an investment
      subadviser to any fund described in (1) above or an affiliate of such
      subadviser, and such persons' families and their beneficial accounts.
 
  (3) Directors, officers, employees and, when permitted, registered
      representatives of financial institutions that have a selling group
      agreement with the Distributor and their spouses and children under 21
      years of age when purchasing for any accounts they beneficially own, or,
      in the case of any such financial institution, when purchasing for
      retirement plans for such institution's employees, provided that such
      purchases are otherwise permitted by such institutions.
 
  (4) Registered investment advisers who charge a fee for their services, trust
      companies and bank trust departments investing on their own behalf or on
 
                                       27
<PAGE>   28
 
behalf of their clients. The Distributor may pay authorized dealers through
which purchases are made an amount up to 0.50% of the amount invested over a
twelve-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 detail 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 Code, or custodial accounts
      held by a bank created pursuant to Section 403(b) of the Code and
      sponsored by non-profit organizations defined under Section 501(c)(3) of
      the Code and assets held by an employer or trustee in connection with an
      eligible deferred compensation plan under Section 457 of the Code. Such
      plans will qualify for purchases at net asset value provided, for plans
      initially establishing accounts with the Distributor in the Participating
      Funds after February 1, 1997, that (1) the initial amount invested in the
      Participating Funds is at least $500,000 or (2) such shares are purchased
      by an employer sponsored plan with more than 100 eligible employees. Such
      plans that have been established with a Participating Fund or have
      received proposals from the Distributor prior to February 1, 1997 based on
      net asset value purchase privileges previously in effect will be qualified
      to purchase shares of the Participating Funds at net asset value for
      accounts established on or before May 1, 1997. Section 403(b) and similar
      accounts for which Van Kampen American Capital Trust Company served as
      custodian will not be eligible for net asset value purchases based on the
      aggregate investment made by the plan or the number of eligible employees,
      except under certain uniform criteria established by the Distributor from
      time to time. Prior to February 1, 1997, a commission will be paid to
      authorized dealers who initiate and are responsible for such purchases
      within a rolling twelve-month period as follows: 1.00% on sales to $5
      million, plus 0.50% on the next $5 million and 0.25% on the excess over
      $10 million. For purchases on February 1, 1997 and thereafter, a
      commission will be paid as follows: 1.00% on sales to $2
                                       28
<PAGE>   29
 
      million, plus 0.80% on the next $1 million, plus 0.50% on the next $47
      million and 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 CDSC of 1.00% in the event of
      redemption within one year of purchase, and a commission will be paid to
      authorized dealers who initiate and are responsible for such sales to each
      individual as follows: 1.00% on sales to $2 million, plus 0.80% on the
      next $1 million and 0.50% on the excess over $3 million.
 
The term "families" includes a person's spouse, children under 21 years of age
and grandchildren, parents, and a person's spouse's parents.
 
  Purchase orders made pursuant to clause (4) may be placed either through
authorized dealers as described above or directly with ACCESS by the investment
adviser, trust company or bank trust department, provided that ACCESS 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 herein under "Distribution and Service Plans"
on purchases made as described in (3) through (9) above. The Fund may terminate,
or amend the terms of, offering shares of the Fund at net asset value to such
groups at any time.
 
                                       29
<PAGE>   30
 
CLASS B SHARES
 
  Class B shares are offered at net asset value. Class B shares which are
redeemed within five years of purchase are subject to a CDSC at the rates set
forth in the following table charged as a percentage of the dollar amount
subject thereto. The 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 charge is assessed on shares derived from
reinvestment of dividends or capital gains distributions. 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 CDSC, if any, varies depending on the number of years from
the time of payment for the purchase of Class B shares until the time of
redemption of such shares. Solely for purposes of determining the number of
years from the time of any payment for the purchase of shares, all payments
during a month are aggregated and deemed to have been made on the last day of
the month.
 
- ------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                CONTINGENT DEFERRED SALES CHARGE
                                                       AS A PERCENTAGE OF
YEAR SINCE PURCHASE                             DOLLAR AMOUNT SUBJECT TO CHARGE
- --------------------------------------------------------------------------------
<S>                                             <C>
First..........................................              5.00%
Second.........................................              4.00%
Third..........................................              3.00%
Fourth.........................................              2.50%
Fifth..........................................              1.50%
Sixth and after................................               None
</TABLE>
 
- ------------------------------------------------------------------------------
 
  In determining whether a CDSC is applicable to a redemption, it is assumed
that the redemption is first, of any shares in the shareholder's Fund account
that are not subject to a CDSC, second of shares held for over five years and
third of shares held longest during the five year period.
 
  To provide an example, assume an investor purchased 100 shares at $10 per
share (at a cost of $1,000) and in the second year after purchase, the net asset
value per share is $12 and, during such time, the investor has acquired 10
additional shares upon dividend reinvestment. If at such time the investor makes
his or her first redemption of 50 shares (proceeds of $600), 10 shares will not
be subject to charge because of dividend reinvestment. With respect to the
remaining 40 shares, the charge is applied only to the original cost of $10 per
share and not to the increase in net asset value of $2 per share. Therefore,
$400 of the $600 redemption proceeds is
 
                                       30
<PAGE>   31
 
subject to a deferred sales charge at a rate of 4.00% (the applicable rate in
the second year after purchase).
 
  A commission or transaction fee of 4.00% of the purchase amount will be paid
to authorized dealers at the time of purchase. Additionally, the Distributor
may, from time to time, pay additional promotional incentives in the form of
cash or other compensation to authorized dealers that sell Class B shares of the
Fund.
 
CLASS C SHARES
 
  Class C shares are offered at net asset value. Class C shares which are
redeemed within the first year of purchase are subject to a CDSC of 1.00%. The
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 charge is assessed on shares derived from reinvestment of dividends
or capital gains distributions. 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 buy Class A shares.
 
  In determining whether a CDSC is applicable to a redemption, it is assumed
that the redemption is first of any shares in the shareholder's Fund account
that are not subject to a CDSC and second of shares held for more than one year.
 
  A commission or transaction fee of up to 1.00% of the purchase amount will
generally be paid to authorized dealers at the time of purchase. Authorized
dealers also will be paid ongoing commissions and transaction fees of up to
0.75% of the average daily net assets of the Fund's Class C shares annually
commencing in the second year after purchase. Additionally, the Distributor may,
from time to time, pay additional promotional incentives in the form of cash or
other compensation, to authorized dealers that sell Class C shares of the Fund.
 
WAIVER OF CONTINGENT DEFERRED SALES CHARGE
 
  The CDSC is waived on redemptions of Class B shares and Class C shares (i)
following the death or disability (as defined in the Code) of a shareholder,
(ii) in connection with required minimum distributions from an IRA or other
retirement plan, (iii) pursuant to the Fund's systematic withdrawal plan but
limited to 12% annually of the initial value of the account and (iv) in
circumstances under which no commission or transaction fee is paid to authorized
dealers at the time of purchase of such shares: and (v) effected pursuant to the
right of the Fund to liquidate a shareholder's account as described herein under
"Redemption of Shares." The CDSC also is waived on redemptions of Class C shares
as it relates to the reinvestment of redemption proceeds in shares of the same
class of the Fund
 
                                       31
<PAGE>   32
 
within 180 days after redemption. See the Statement of Additional Information
for further discussion of waiver provisions.
 
- ------------------------------------------------------------------------------
SHAREHOLDER SERVICES
- ------------------------------------------------------------------------------
 
  The Fund offers a number of shareholder services designed to facilitate
investment in its shares at little or no extra cost to the investor. The
following is a description of such services.
 
  INVESTMENT ACCOUNT. Each shareholder has an investment account under which the
investor's shares of the Fund are held by ACCESS, the Fund's transfer agent.
ACCESS performs bookkeeping, data processing and administration services
relating to the maintenance of shareholder accounts. Except as described in this
Prospectus, after each share transaction in an account, the shareholder receives
a statement showing the activity in the account. Each shareholder who has an
account in certain of the Participating Funds will receive statements quarterly
from ACCESS showing any reinvestments of dividends and capital gains
distributions and any other activity in the account since the preceding
statement. Such shareholders also will receive separate confirmations for each
purchase or sale transaction other than reinvestment of dividends and capital
gains distributions and systematic purchases or redemptions. Additions to an
investment account may be made at any time by purchasing shares through
authorized dealers or by mailing a check directly to ACCESS.
 
  SHARE CERTIFICATES. Generally, the Fund will not issue share certificates.
However, upon written or telephone request to the Fund, a share certificate will
be issued representing shares (with the exception of fractional shares) of the
Fund. A shareholder will be required to surrender such certificates upon
redemption thereof. In addition, if such certificates are lost the shareholder
must write to Van Kampen American Capital Funds, c/o ACCESS, P.O. Box 418256,
Kansas City, MO 64141-9256, requesting an "affidavit of loss" and obtain a
Surety Bond in a form acceptable to ACCESS. On the date the letter is received,
ACCESS will calculate a fee for replacing the lost certificates equal to no more
than 2.00% of the net asset value of the issued shares, and bill the party to
whom the replacement certificate was mailed.
 
  REINVESTMENT PLAN. A convenient way for investors to accumulate additional
shares is by accepting dividends and capital gains distributions in shares of
the Fund. Such shares are acquired at net asset value per share (without sales
charge) on the record date. 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 in writing
to ACCESS. The investor may, on the initial application or prior to any
declaration, instruct that dividends be paid in cash and capital gains
distributions be reinvested
 
                                       32
<PAGE>   33
 
at net asset value, or that both dividends and capital gains distributions be
paid in cash.
 
  AUTOMATIC INVESTMENT PLAN. An automatic investment plan is available under
which a shareholder can authorize ACCESS to debit a bank account on a regular
basis to invest predetermined amounts in the Fund. Additional information is
available from the Distributor or authorized dealers.
 
  RETIREMENT PLANS. Eligible investors may establish individual retirement
accounts ("IRAs"); SEP; 401(k) plans; Section 403(b)(7) plans in the case of
employees of public school systems and certain non-profit organizations; or
other pension or profit sharing plans. Documents and forms containing detailed
information regarding these plans are available from the Distributor. Van Kampen
American Capital Trust Company serves as custodian under the IRA, 403(b)(7) and
Keogh plans. Details regarding fees, as well as full plan administration for
profit sharing, pension and 401(k) plans, are available from the Distributor.
 
  AUTOMATED CLEARING HOUSE ("ACH") DEPOSITS.  Holders of Class A shares can use
ACH to have redemption proceeds deposited electronically into their bank
accounts. Redemptions transferred to a bank account via the ACH plan are
available to be credited to the account on the second business day following
normal payment. In order to utilize this option, the shareholder's bank must be
a member of ACH. In addition, the shareholder must fill out the appropriate
section of the account application. The shareholder must also include a voided
check or deposit slip from the bank account into which redemptions are to be
deposited together with the completed application. Once ACCESS has received the
application and the voided check or deposit slip, such shareholder's designated
bank account, following any redemption, will be credited with the proceeds of
such redemption. Once enrolled in the ACH plan, a shareholder may terminate
participation at any time by writing ACCESS.
 
  DIVIDEND DIVERSIFICATION. A shareholder may, upon written request or by
completing the appropriate section of the application accompanying this
Prospectus or by calling (800) 341-2911 ((800) 421-2833 for the hearing
impaired), elect to have all dividends and other distributions paid on a class
of shares of the Fund invested into shares of the same class of any
Participating Fund so long as the investor has a pre-existing account for such
class of shares of the other fund. Both accounts must be of the same type,
either non-retirement or retirement. If the accounts are retirement accounts,
they must be for the same class and of the same type of retirement plan (e.g.,
IRA, 403(b)(7), 401(k), Keogh) and for the benefit of the same individual. If a
qualified, pre-existing account does not exist, the shareholder must establish a
new account subject to minimum investment and other requirements of the fund
into which distributions would be invested. Distributions are invested into the
selected fund at its net asset value as of the payable date of the distribution.
                                       33
<PAGE>   34
 
  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 values 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 the
Participating Fund. Shareholders seeking an exchange into a Participating Fund
should obtain and read the current prospectus for such fund.
 
  To be eligible for exchange, shares of the Fund must have been registered in
the shareholder's name for at least 30 days. Shares of the Fund registered in a
shareholder's name for less than 30 days may be exchanged only upon receipt of
prior approval of the Adviser. It is the policy of the Adviser, under normal
circumstances, not to approve such requests.
 
  When Class B shares and Class C shares are exchanged among Participating
Funds, the holding period for purposes of computing the CDSC is based upon the
date of the initial purchase of such shares from a Participating Fund. If such
Class B or Class C shares are redeemed and not exchanged for shares of another
Participating Fund, such Class B or Class C shares are subject to the CDSC
schedule imposed by the Participating Fund from which such shares were
originally purchased.
 
  Exchanges of shares are sales and may result in a gain or loss for federal
income tax purposes. If the shares exchanged have been held for less than 91
days, the 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 ACCESS or by contacting the telephone transaction line at (800)
421-5684. A shareholder automatically has telephone exchange privileges unless
otherwise designated in the application form accompanying this Prospectus. Van
Kampen American Capital and its subsidiaries, including ACCESS (collectively,
"VKAC"), and the Fund employ procedures considered by them to be reasonable to
confirm that instructions communicated by telephone are genuine. Such procedures
include requiring certain personal identification information prior to acting
upon telephone instructions, tape recording telephone communications, and
providing written confirmation of instructions communicated by telephone. If
reasonable procedures are employed, neither VKAC nor the Fund will be liable for
following telephone instructions which it reasonably believes to be genuine.
VKAC and the Fund may be liable for any losses due to unauthorized or fraudulent
instructions if reasonable procedures are not followed. 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 options (except
                                       34
<PAGE>   35
 
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 file a specific written request. The Fund reserves the right to
reject any order to acquire its shares through exchange. In addition, 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.
 
  A prospectus of any of these mutual funds may be obtained from any authorized
dealer or the Distributor. An investor considering an exchange to one of such
funds should refer to the prospectus for additional information regarding such
fund prior to investing.
 
  SYSTEMATIC WITHDRAWAL PLAN. Any investor whose shares in a single account
total $10,000 or more at the offering price next computed after receipt of
instructions may establish a monthly, quarterly, semi-annual or annual
withdrawal plan. Any investor whose shares in a single account total $5,000 or
more at the offering price next computed after receipt of instructions may
establish a quarterly, semi-annual or annual withdrawal plan. This plan provides
for the orderly use of the entire account not only the income but also the
capital, if necessary. Each withdrawal constitutes a redemption of shares on
which any capital gain or loss will be recognized. The plan holder may arrange
for monthly, quarterly, semi-annual, or annual checks in any amount not less
than $25. Such a systematic withdrawal plan may also be maintained by an
investor purchasing shares for a retirement plan established on a form made
available by the Fund. See "Shareholder Services -- Retirement Plans."
 
  Class B shareholders and Class C shareholders who establish a withdrawal plan
may redeem up to 12% annually of the shareholder's initial account balance
without incurring a CDSC. Initial account balance means the amount of the
shareholder's investment at the time the election to participate in the plan is
made.
 
  Under the plan, sufficient shares of the Fund are redeemed to provide the
amount of the periodic withdrawal payment. Dividends and capital gains
distributions on shares held under the plan are reinvested in additional shares
at the next determined net asset value. If periodic withdrawals continuously
exceed reinvested dividends and capital gains distributions, the shareholder's
original investment will be correspondingly reduced and ultimately exhausted.
Withdrawals made concurrently with the purchase of additional shares ordinarily
will be disadvantageous to the shareholder because of the duplication of sales
charges. Any gain or loss realized by the shareholder upon redemption of shares
is a taxable event.
 
  INTERNET TRANSACTIONS. In addition to performing transactions on your account
through written instruction or by telephone, you may also perform certain
transac-
 
                                       35
<PAGE>   36
 
tions through the Internet. Please refer to our web site at www.vkac.com for
further instruction. VKAC and the Fund employ procedures considered by them to
be reasonable to confirm that instructions communicated through the Internet are
genuine. Such procedures include requiring use of a personal identification
number prior to acting upon Internet instructions and providing written
confirmation of instructions communicated through the Internet. If reasonable
procedures are employed, neither VKAC nor the Fund will be liable for following
instructions through the Internet which it reasonably believes to be genuine. If
an account has multiple owners, ACCESS may rely on the instructions of any one
owner.
 
- ------------------------------------------------------------------------------
REDEMPTION OF SHARES
- ------------------------------------------------------------------------------
 
  REGULAR REDEMPTIONS. Shareholders may redeem for cash some or all of their
shares of the Fund at any time. To do so, a written request in proper form must
be sent directly to ACCESS, P.O. Box 418256, Kansas City, Missouri 64141-9256.
Shareholders may also place redemption requests through an authorized dealer.
Orders received from authorized dealers must be at least $500 unless transmitted
via the FUNDSERV network. The redemption price for such shares is the net asset
value next calculated after an order 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.
 
  As described herein under "Purchase of Shares," redemptions of Class B shares
and Class C shares are subject to a CDSC. In addition, a CDSC of 1.00% may be
imposed on certain redemptions of Class A shares made within one year of
purchase for investments of $1 million or more. The CDSC incurred upon
redemption is paid to the Distributor in reimbursement for distribution-related
expenses. A custodian of a retirement plan account may charge fees based on the
custodian's fee schedule.
 
  The request for redemption 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. In some cases, however,
other documents may be necessary. For example, although the Fund normally does
not issue
 
                                       36
<PAGE>   37
 
certificates for shares, it will do so if a special request has been made to
ACCESS. In the case of shareholders holding certificates, the certificates for
the shares being redeemed must accompany the redemption request. In the event
the redemption is requested by a corporation, partnership, trust, fiduciary,
executor or administrator, and the name and title of the individual(s)
authorizing such redemption is not shown in the account registration, a copy of
the corporate resolution or other legal documentation appointing the authorized
signer and certified within the prior 120 days must accompany the redemption
request. IRA redemption requests should be sent to the IRA custodian to be
forwarded to ACCESS. Where Van Kampen American Capital Trust Company serves as
IRA custodian, special IRA, 403(b)(7), or Keogh distribution forms must be
obtained from and be forwarded to Van Kampen American Capital Trust Company, P.
O. Box 944, Houston, Texas 77001-0944. Contact the custodian for information.
 
  In the case of redemption requests sent directly to ACCESS, the redemption
price is the net asset value per share next determined after the request is
received. Payment for shares redeemed will be made by check mailed within seven
days after acceptance by ACCESS of the request and any other necessary documents
in proper order. Such payment may be postponed or the right of redemption
suspended as provided by the rules of the SEC. If the shares to be redeemed have
been recently purchased by check, ACCESS may delay mailing a redemption check
until it confirms the purchase check has cleared, which may take up to fifteen
days. A taxable gain or loss will be recognized by the shareholder upon
redemption of shares.
 
  TELEPHONE REDEMPTIONS. In addition to the regular redemption procedures set
forth above, the Fund permits redemption of shares by telephone and for
redemption proceeds to be sent to the address of record for the account or to
the bank account of record as described below. To establish such privilege, a
shareholder must complete the appropriate section of the application
accompanying this Prospectus or call the Fund at (800) 341-2911 to request that
a copy of the Telephone Redemption Authorization form be sent to them for
completion. To redeem shares, contact the telephone transaction line at (800)
421-5684. VKAC and the Fund employ procedures considered by them to be
reasonable to confirm that instructions communicated by telephone are genuine.
Such procedures include requiring certain personal identification information
prior to acting upon telephone instructions, tape recording telephone
communications and providing written confirmation of instructions communicated
by telephone. If reasonable procedures are employed, neither VKAC nor the Fund
will be liable for following telephone instructions which it reasonably believes
to be genuine. VKAC and the Fund may be liable for any losses due to
unauthorized or fraudulent instructions if reasonable procedures are not
followed. Telephone redemptions may not be available if the shareholder cannot
reach ACCESS by telephone, whether because all telephone lines are busy or for
any other reason; in such case, a shareholder would have to use
                                       37
<PAGE>   38
 
the Fund's regular redemption procedure previously described. Requests received
by ACCESS prior to 4:00 p.m., New York time, on a regular business day will be
processed at the net asset value per share determined that day. These privileges
are available for all accounts other than retirement accounts. The telephone
redemption privilege is not available for shares represented by certificates. If
an account has multiple owners, ACCESS 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 are expected to be wired on the next business day following the date
of redemption. This service is also not available with respect to shares held in
an individual retirement account (IRA) for which Van Kampen American Capital
Trust Company acts as custodian. The Fund reserves the right at any time to
terminate, limit or otherwise modify this redemption privilege.
 
  GENERAL REDEMPTION INFORMATION. The Fund may redeem any shareholder account
with a net asset 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 given and the
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.
 
  REDEMPTION UPON DEATH OR DISABILITY. The Fund will waive the CDSC on
redemptions following the death or disability of a Class B shareholder or Class
C shareholder. An individual will be considered disabled for this purpose if he
or she meets the definition thereof in Section 72(m)(7) of the Code, which in
pertinent part defines a person as disabled if such person "is unable to engage
in any substantial gainful activity by reason of any medically determinable
physical or mental impairment which can be expected to result in death or to be
of long-continued and indefinite duration." While the Fund does not specifically
adopt the balance of the Code's definition which pertains to furnishing the
Secretary of Treasury with such proof as he or she may require, the Distributor
will require satisfactory proof of disability before it determines to waive the
CDSC on Class B shares and Class C shares.
 
  In cases of death or disability, the CDSC on Class B shares and Class C shares
will be waived where the decedent or disabled person is either an individual
shareholder or owns the shares as a joint tenant with right of survivorship or
is the beneficial owner of a custodial or fiduciary account, and where the
redemption is
                                       38
<PAGE>   39
 
made within one year of death or the initial determination of disability. This
waiver of the CDSC on Class B shares and Class C shares applies to a total or
partial redemption, but only to redemptions of shares held at the time of the
death or the initial determination of disability.
 
  REINSTATEMENT PRIVILEGE. A Class A shareholder or Class B shareholder who has
redeemed shares of the Fund may reinstate any portion or all of the proceeds of
such redemption in Class A shares of the Fund. A Class C shareholder who has
redeemed shares of the Fund may reinstate any portion or all of the net proceeds
of such redemption in Class C shares of the Fund with credit given for any CDSC
paid upon such redemption. Such reinstatement is made at the net asset value
(without sales charge except as described under "Shareholder
Services -- Exchange Privilege") next determined after the order is received,
which must be within 180 days after the date of the redemption. Reinstatement at
net asset value is also offered to participants in those eligible retirement
plans held or administered by Van Kampen American Capital Trust Company for
repayment of principal (and interest) on their borrowings on such plans.
 
- ------------------------------------------------------------------------------
DISTRIBUTION AND SERVICE PLANS
- ------------------------------------------------------------------------------
 
  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. The Distribution Plan and the Service Plan provide
that the Fund may spend a portion of the Fund's average daily net assets
attributable to each class of shares in connection with distribution of the
respective class of shares and in connection with the provision of ongoing
services to shareholders of each class. The Distribution Plan and the Service
Plan are being implemented through an agreement with the Distributor and
sub-agreements between the Distributor and brokers, dealers or financial
intermediaries (collectively, "Selling Agreements") that may provide for their
customers or clients certain services or assistance.
 
  CLASS A SHARES. The Fund may spend an aggregate amount up to 0.25% per year of
the average daily net assets attributable to the Class A shares of the Fund
pursuant to the Distribution Plan and Service Plan. From such amount, the Fund
may spend up to 0.25% per year of the Fund's average daily net assets
attributable to the Class A shares pursuant to the Service Plan in connection
with the ongoing provision of services to holders of such shares by the
Distributor and by brokers, dealers or financial intermediaries and in
connection with the maintenance of such shareholders' accounts. The Fund pays
the Distributor the lesser of the balance of the 0.25% not paid to such brokers,
dealers or financial intermediaries or the amount of the Distributor's actual
distribution-related expense. The rates above are
 
                                       39
<PAGE>   40
 
0.15% with respect to Class A shares in accounts existing on or before October
19, 1992.
 
  CLASS B SHARES. The Fund may spend up to 0.75% per year of the average daily
net assets attributable to the Class B shares of the Fund pursuant to the
Distribution Plan. In addition, the Fund may spend up to 0.25% per year of the
Fund's average daily net assets attributable to the Class B shares pursuant to
the Service Plan in connection with the ongoing provision of services to holders
of such shares by the Distributor and by brokers, dealers or financial
intermediaries and in connection with the maintenance of such shareholders'
accounts.
 
  CLASS C SHARES. The Fund may spend up to 0.75% per year of the average daily
net assets attributable to the Class C shares of the Fund pursuant to the
Distribution Plan. From such amount, the Fund, or the Distributor as agent for
the Fund, pays brokers, dealers or financial intermediaries in connection with
the distribution of the Class C shares up to 0.75% of the Fund's average daily
net assets attributable to Class C shares maintained in the Fund more than one
year by such broker's, dealer's or financial intermediary's customers. The Fund
pays the Distributor the lesser of the balance of 0.75% not paid to such
brokers, dealers or financial intermediaries or the amount of the Distributor's
actual distribution-related expense attributable to the Class C shares. In
addition, the Fund may spend up to 0.25% per year of the Fund's average daily
net assets attributable to the Class C shares pursuant to the Service Plan in
connection with the ongoing provision of services to holders of such shares by
the Distributor and by brokers, dealers or financial intermediaries and in
connection with the maintenance of such shareholders' accounts.
 
  OTHER INFORMATION. Amounts payable to the Distributor with respect to the
Class A shares under the Distribution Plan in a given year may not fully
reimburse the Distributor for its actual distribution-related expenses during
such year. In such event, with respect to the Class A shares, there is no
carryover of such reimbursement obligations to succeeding years.
 
  The Distributor's actual expenses with respect to Class B shares or Class C
shares for any given year may exceed the amounts payable to the Distributor with
respect to such class of shares under the Distribution Plan, the Service Plan
and payments received pursuant to the CDSC. In such event, with respect to any
such class of shares, any unreimbursed expenses will be carried forward and paid
by the Fund (up to the amount of the actual expenses incurred) in future years
so long as such Distribution Plan is in effect. Except as mandated by applicable
law, the Fund does not impose any limit with respect to the number of years into
the future that such unreimbursed expenses may be carried forward (on a Fund
level basis). Because such expenses are accounted on a Fund level basis, in
periods of extreme net asset value fluctuation such amounts with respect to a
particular Class B share or Class C share may be greater or less than the amount
of the initial commission
                                       40
<PAGE>   41
 
(including carrying cost) paid by the Distributor with respect to such share. In
such circumstances, a shareholder of a share may be deemed to incur expenses
attributable to other shareholders of such class. As of December 31, 1997, there
were $3,238,624.12 and $125,255.27 of unreimbursed distribution-related expenses
with respect to Class B shares and Class C shares, respectively, representing
2.63% and 1.15% of the Fund's net assets attributable to Class B shares and
Class C shares, respectively. If the Distribution Plan was terminated or not
continued, the Fund would not be contractually obligated to pay the Distributor
for any expenses not previously reimbursed by the Fund or recovered through
CDSCs.
 
  The Distributor will not use the proceeds from the CDSC applicable to a
particular class of shares to defray distribution-related expenses attributable
to any other class of shares. Various federal and state laws prohibit national
banks and some state-chartered commercial banks from underwriting or dealing in
the Fund's shares. In addition, state securities laws on this issue may differ
from the interpretations of federal law, and banks and financial institutions
may be required to register as dealers pursuant to state law. In the unlikely
event that a court were to find that these laws prevent such banks from
providing such services described above, the Fund would seek alternate providers
and expects that shareholders would not experience any disadvantage.
- ------------------------------------------------------------------------------
DISTRIBUTIONS FROM THE FUND
- ------------------------------------------------------------------------------
 
  In addition to any increase in the value of shares which the Fund may achieve,
shareholders may receive two kinds of return from the Fund: dividends and
capital gains distributions.
 
  DIVIDENDS. Dividends from stocks and interest earned from other investments
are the Fund's main source of income. Substantially all of this income, less
expenses, is distributed quarterly as dividends to shareholders. Unless the
shareholder instructs otherwise, dividends are automatically applied to purchase
additional shares of the Fund at the next determined net asset value. See
"Shareholder Services -- Reinvestment Plan."
 
  The per share dividends on Class B shares and Class C shares may be lower than
the per share dividends on Class A shares as a result of the higher distribution
fees and transfer agency costs applicable to such classes of shares.
 
  CAPITAL GAINS. The Fund may realize capital gains or losses when it sells
securities, depending on whether the sales prices for the securities are higher
or lower than their purchase prices. The Fund distributes to shareholders at
least once a year the excess, if any, of its total profits on the sale of
securities during the year over its total losses on the sale of securities,
including capital losses carried forward from prior years under tax laws. As in
the case of dividends, capital gains
 
                                       41
<PAGE>   42
 
distributions are automatically reinvested in additional shares of the Fund at
net asset value unless the shareholder elects otherwise. See "Shareholder
Services -- Reinvestment Plan."
 
- ------------------------------------------------------------------------------
TAX STATUS
- ------------------------------------------------------------------------------
 
  FEDERAL INCOME TAXATION OF THE FUND.  The Fund has elected and qualified and
intends to continue to qualify each year to be treated as a regulated investment
company under Subchapter M of the Code. To qualify as a regulated investment
company, the Fund must comply with certain requirements of the Code relating to,
among other things, the source of its income and diversification of its assets.
 
  If the Fund so qualifies and distributes each year to its shareholders at
least 90% of its net investment income (including tax-exempt interest, taxable
income and net short-term capital gain, but not net capital gains, which are the
excess of net long-term capital gains over net short-term capital losses), it
will not be required to pay federal income taxes on any income distributed to
shareholders. The Fund intends to distribute at least the minimum amount of net
investment income necessary to satisfy the 90% distribution requirement. The
Fund will not be subject to federal income tax on any net capital gains
distributed to shareholders.
 
  In order to avoid a 4% excise tax, the Fund will be required to distribute, by
December 31 of each year, at least 98% of its ordinary income (not including
tax-exempt income) for such year and at least 98% of its capital gain net income
(the latter of which generally is computed on the basis of the one-year period
ending on October 31 of such year), plus any amounts that were not distributed
in previous taxable years. For purposes of the excise tax, any ordinary income
or capital gain net income retained by, and subject to federal income tax in the
hands of, the Fund will be treated as having been distributed.
 
  If the Fund failed to qualify as a regulated investment company or failed to
satisfy the 90% distribution requirement in any taxable year, the Fund would be
taxed as an ordinary corporation on its taxable income (even if such income were
distributed to its shareholders) and all distributions out of earnings and
profits would be taxed to shareholders as ordinary income. To qualify again as a
regulated investment company in a subsequent year, the Fund may be required to
pay an interest charge on 50% of its earnings and profits attributable to
non-regulated investment company years and would be required to distribute such
earnings and profits to shareholders (less any interest charge). In addition, if
the Fund failed to qualify as a regulated investment company for its first
taxable year or, if immediately after qualifying as a regulated investment
company for any taxable year, it failed to qualify for a period greater than one
taxable year, the Fund would be required to recognize any net built-in gains
(the excess of aggregate gains, including
 
                                       42
<PAGE>   43
 
items of income, over aggregate losses that would have been realized if it had
been liquidated) in order to qualify as a regulated investment company in a
subsequent year.
 
  Some of the Fund's investment practices are subject to special provisions of
the Code that, among other things, may defer the use of certain losses of the
Fund and affect the holding period of the securities held by the Fund and the
character of the gains or losses realized by the Fund. These provisions may also
require the Fund to recognize income or gain without receiving cash with which
to make distributions in amounts necessary to satisfy the 90% distribution
requirement and the distribution requirements for avoiding income and excise
taxes. The Fund will monitor its transactions and may make certain tax elections
in order to mitigate the effect of these rules and prevent disqualification of
the Fund as a regulated investment company.
 
  Investments of the Fund in securities issued at a discount or providing for
deferred interest or payment of interest in kind are subject to special tax
rules that will affect the amount, timing and character of distributions to
shareholders. For example, with respect to securities issued at a discount, the
Fund will be required to accrue as income each year a portion of the discount
and to distribute such income each year in order to maintain its qualification
as a regulated investment company and to avoid income and excise taxes. In order
to generate sufficient cash to make distributions necessary to satisfy the 90%
distribution requirement and to avoid income and excise taxes, the Fund may have
to dispose of securities that it would otherwise have continued to hold.
 
  The Fund may invest in the stock of "passive foreign investment companies"
("PFICs"). A PFIC is a foreign corporation that, in general, meets either of the
following tests: (1) at least 75% of its gross income passive or (2) an average
of at least 50% of its assets produce, or are held for the production of,
passive income. Under certain circumstances, a regulated investment company that
holds stock of a PFIC will be subject to federal income tax (i) on a portion of
any "excess distribution" received on the stock or (ii) on any gain from a sale
or disposition of the stock (collectively, "PFIC income"), plus interest
thereon, even if the regulated investment company distributes the PFIC income as
a taxable dividend to its stockholders. The balance of the PFIC income will be
included in the regulated investment company's investment company taxable income
and, accordingly, will not be taxable to it to the extent that income is
distributed to its shareholders. If the Fund invests in a PFIC and elects to
treat the PFIC as a "qualified electing fund," then in lieu of the foregoing tax
and interest obligation, the Fund would be required to include in income each
year its pro rata share of the qualified electing fund's annual ordinary
earnings and net capital gain, which most likely would have to be distributed by
the Fund to satisfy the distribution requirement for avoiding income and excise
taxes. In many instances it may be very difficult to make this election due to
certain requirements imposed with respect to the election.
 
                                       43
<PAGE>   44
 
  As an alternative to making the above-described election to treat the PFIC as
a qualified electing fund, the Fund may make an election to annually
mark-to-market certain publicly traded PFIC stock (a "PFIC Mark-to-Market
Election"). "Marking-to-market," in this context, means recognizing as ordinary
income or loss each year an amount equal to the difference between the Fund's
adjusted tax basis in such PFIC stock and its fair market value. Losses will be
allowed only to the extent of net mark-to-market gain previously included by the
Fund pursuant to the election for prior taxable years. The Fund may be required
to include in its taxable income for the first taxable year in which it makes a
PFIC Mark-to-Market Election an amount equal to the interest charge that would
otherwise accrue with respect to distributions on, or proceeds from dispositions
of, the PFIC stock. This amount would not be deductible from the Fund's taxable
income. The PFIC Mark-to-Market Election generally applies to the taxable year
for which made and to all subsequent taxable years, unless the Internal Revenue
Service consents to revocation of the election. By making the PFIC
Mark-to-Market Election, the Fund could ameliorate the adverse tax consequences
arising from its ownership of PFIC stock, but in any particular year may be
required to recognize income in excess of the distributions it receives from the
PFIC and proceeds from the dispositions of PFIC stock.
 
  DISTRIBUTIONS.  Distributions of the Fund's net investment income are taxable
to shareholders as ordinary income to the extent of the Fund's earnings and
profits, whether paid in cash or reinvested in additional shares. Distributions
of the Fund's net capital gains ("capital gain dividends"), if any, are taxable
to shareholders as long-term capital gains regardless of the length of time
shares of the Fund have been held by such shareholders. Distributions in excess
of the Fund's earnings and profits will first reduce the adjusted tax basis of a
holder's shares and, after such adjusted tax basis is reduced to zero, will
constitute capital gains to such holder (assuming such shares are held as a
capital asset). For a summary of the tax rates applicable to capital gains
(including capital gain dividends), see "Capital Gains Rates Under the 1997 Tax
Act" below. Tax-exempt shareholders not subject to federal income tax on their
income generally will not be taxed on distributions from the Fund.
 
  Shareholders receiving distributions in the form of additional shares issued
by the Fund will be treated for federal income tax purposes as receiving a
distribution in an amount equal to the fair market value of the shares received,
determined as of the distribution date. The basis of such shares will equal the
fair market value on the distribution date.
 
  The Fund will inform shareholders of the source and tax status of all
distributions promptly after the close of each calendar year. Some portion of
the distributions from the Fund may be eligible for the dividends received
deduction for corporations
 
                                       44
<PAGE>   45
 
if the Fund receives qualifying dividend during the year and if certain other
requirements of the Code are satisfied.
 
  Although dividends generally will be treated as distributed when paid,
dividends declared in October, November or December, payable to shareholders of
record on a specified date in such month and paid during January of the
following year will be treated as having been distributed by the Fund and
received by the shareholders on the December 31 prior to the date of payment. In
addition, certain other distributions made after the close of a taxable year of
the Fund may be "spilled back" and treated as paid by the Fund (except for
purposes of the 4% excise tax) during such taxable year. In such case,
shareholders will be treated as having received such dividends in the taxable
year in which the distribution was actually made.
 
  Income from investments in foreign securities received by the Fund may be
subject to income, withholding and other taxes imposed by foreign countries and
U.S. possessions. Such taxes will not be deductible or creditable by
shareholders. Tax conventions between certain countries and the United States
may reduce or eliminate such taxes.
 
  Under Code Section 988, foreign currency gains or losses from certain forward
contracts not traded in the interbank market as well as certain other gains or
losses attributable to currency exchange rate fluctuations are typically treated
as ordinary income or loss. Such income or loss may increase or decrease (or
possibly eliminate) the Fund's income available for distribution. If, under the
rules governing the tax treatment of foreign currency gains and losses, the
Fund's income available for distribution is decreased or eliminated, all or a
portion of the dividends declared by the Fund may be treated for federal income
tax purposes as a return of capital or, in some circumstances, as capital gain.
Generally, a shareholder's tax basis in Fund shares will be reduced to the
extent that an amount distributed to such shareholder is treated as a return of
capital.
 
  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.
 
  SALE OF SHARES.  The sale of shares (including transfers in connection with a
redemption or repurchase of shares) will be a taxable transaction for federal
income tax purposes. Selling shareholders will generally recognize gain or loss
in an amount equal to the difference between their adjusted tax basis in the
shares and the amount received. If such shares are held as a capital asset, the
gain or loss will be a capital gain or loss and will be long-term if such shares
have been held for more than one year. For a summary of the tax rates applicable
to capital gains, see "Capital Gains Rates Under the 1997 Tax Act" below. Any
loss recognized upon a
 
                                       45
<PAGE>   46
 
taxable disposition of shares held for six months or less will be treated as a
long-term capital loss to the extent of any capital gain dividends received with
respect to such shares. For purposes of determining whether shares have been
held for six months or less, the holding period is suspended for any periods
during which the shareholder's risk of loss is diminished as a result of holding
one or more other positions in substantially similar or related property or
through certain options or short sales.
 
  CAPITAL GAINS RATES UNDER THE 1997 TAX ACT.  Under the Taxpayer Relief Act of
1997 (the "1997 Tax Act"), the maximum tax rate applicable to net capital gains
recognized by individuals and other non-corporate taxpayers is (i) the same as
the maximum ordinary income tax rate for capital assets held for one year or
less, (ii) 28% for capital assets held for more than one year but not more than
18 months and (iii) 20% for capital assets held for more than 18 months. The
1997 Tax Act did not affect the maximum net capital gains tax rate for
corporations, which remains at 35%. The new tax rates for capital gains under
the 1997 Tax Act described above apply to distributions of capital gains
dividends by the Fund (if, as expected, the Fund designates capital gain
dividends as 28% rate gain distributions or 20% rate gain distributions, in
accordance with its holding periods for the securities sold that generated such
capital gain dividends) as well as to sales and exchanges of shares in the Fund.
With respect to capital losses recognized on dispositions of shares held six
months or less where such losses are treated as long-term capital losses to the
extent of prior capital gains dividends received on such shares (see "Sale of
Shares" above), it is unclear how such capital losses offset the capital gains
referred to above. Shareholders should consult their own tax advisors as to the
application of the new capital gains rates to their particular circumstances.
 
  GENERAL.  The federal, state and local income tax discussion set forth above
is for general information only. Prospective investors should consult their
advisors regarding the specific federal tax consequences of holding and
disposing of shares, as well as the effects of state, local and foreign tax law
and any proposed tax law changes.
 
- ------------------------------------------------------------------------------
FUND PERFORMANCE
- ------------------------------------------------------------------------------
 
  From time to time, the Fund may advertise its total return for prior periods.
Any such advertisement would include at least average annual total return
quotations for one, five and ten year periods. Other total return quotations,
aggregate or average, over other time periods may also be included.
 
  The total return of the Fund for a particular period represents the increase
(or decrease) in the value of a hypothetical investment in the Fund from the
beginning to the end of the period. Total return is calculated by subtracting
the value of the
 
                                       46
<PAGE>   47
 
initial investment from the ending value and showing the difference as a
percentage of the initial investment; the calculation assumes the initial
investment is made at the current maximum public offering price (which includes
a maximum sales charge of 5.75% for Class A shares); that all income dividends
or capital gains distributions during the period are reinvested in Fund shares
at net asset value; and that any applicable CDSC has been paid. The Fund's total
return will vary depending on market conditions, the securities comprising the
Fund's portfolio, the Fund's operating expenses and unrealized net capital gains
or losses during the period. Since Class A shares of the Fund were offered at a
maximum sales charge of 8.50% prior to October 19, 1992, actual Fund total
return would have been somewhat less than that computed on the basis of the
current maximum sales charge. Total return is based on historical earnings and
asset value fluctuations and is not intended to indicate future performance. No
adjustments are made to reflect any income taxes payable by shareholders on
dividends and distributions paid by the Fund.
 
  Average annual total return quotations for periods of two or more years are
computed by finding the average annual compounded rate of return over the period
that would equate the initial amount invested to the ending redeemable value.
 
  Total return is calculated separately for Class A shares, Class B shares and
Class C shares. Class A shares total return figures include the maximum sales
charge of 5.75%; Class B shares and Class C shares total return figures include
any applicable CDSC. Because of the differences in sales charges and
distribution fees, the total returns for each of the classes will differ.
 
  From time to time, the Fund may include in its sales literature and
shareholder reports a quotation of the current "distribution rate" for each
class of shares of the Fund. Distribution rate is a measure of the level of
income and short-term capital gain dividends, if any, distributed for a
specified period. Distribution rate differs from yield, which is a measure of
the income actually earned by the Fund's investments, and from total return,
which is a measure of the income actually earned by the Fund's investments plus
the effect of any realized and unrealized appreciation or depreciation of such
investments during a stated period. Distribution rate is, therefore, not
intended to be a complete measure of the Fund's performance. Distribution rate
may sometimes be greater than yield since, for instance, it may not include the
effect of amortization of bond premiums, and may include non-recurring
short-term capital gains and premiums from futures transactions engaged in by
the Fund. Distribution rates will be computed separately for each class of the
Fund's shares.
 
  In reports or other communications to shareholders or in advertising material,
the Fund may compare its performance with that of other mutual funds as listed
in the rankings or ratings prepared by Lipper Analytical Services, Inc., CDA,
Morningstar Mutual Funds or similar independent services which monitor the
performance of
                                       47
<PAGE>   48
 
mutual funds, with the Consumer Price Index, the Dow Jones Industrial Average
Index, Standard & Poor's indices or NASDAQ Composite Index, other appropriate
indices of investment securities, or with investment or savings vehicles. The
performance information may also include evaluations of the Fund published by
nationally recognized ranking services and by nationally recognized financial
publications. Such comparative performance information will be stated in the
same terms in which the comparative data or indices are stated. Such
advertisements and sales material may also include a yield quotation as of a
current period. In each case, such total return and yield information, if any,
will be calculated pursuant to rules established by the SEC and will be computed
separately for each class of the Fund's shares. For these purposes, the
performance of the Fund, as well as the performance of other mutual funds or
indices, do not reflect sales charges, the inclusion of which would reduce Fund
performance. The Fund will include performance data for each class of shares of
the Fund in any advertisement or information including performance data of the
Fund.
 
  The Fund may also utilize performance information in hypothetical
illustrations provided in narrative form. These hypotheticals will be
accompanied by standard performance information required by the SEC as described
above.
 
  The Fund's Annual Report and Semi-Annual Report contains additional
performance information. A copy of the Annual Report and Semi-Annual Report may
be obtained without charge by calling or writing the Fund at the telephone
number and address printed on the cover of this Prospectus.
 
- ------------------------------------------------------------------------------
DESCRIPTION OF SHARES OF THE FUND
- ------------------------------------------------------------------------------
 
  The Fund was originally incorporated in Delaware on November 20, 1967 and was
reincorporated in the State of Maryland on December 31, 1978. The Fund was again
reorganized as a business trust under the laws of Delaware as of August 5, 1995
and adopted its current name at that time.
 
  The authorized capitalization of the Fund consists of an unlimited number of
shares of beneficial interest, par value $0.01 per share, divided into classes.
The Fund currently offers three classes of shares, designated Class A shares,
Class B shares and Class C shares. Other classes may be established from time to
time in accordance with provisions of the Fund's Declaration of Trust. Each
class of shares represents an interest in the same assets of the Fund and
generally are identical in all respects except that each class bears certain
distribution expenses and has exclusive voting rights with respect to its
distribution fee. Except as described herein, there are no conversion,
preemptive or other subscription rights. In the event of liquidation, each of
the shares of the Fund is entitled to its portion of all of the Fund's net
assets after all debt and expenses of the Fund have been paid. Since Class B
shares and Class C shares pay higher distribution fees and transfer agency
 
                                       48
<PAGE>   49
 
costs, the liquidation proceeds to Class B shareholders and Class C shareholders
are likely to be lower than to other shareholders.
 
  The Fund does not contemplate holding regular meetings of shareholders to
elect Trustees or otherwise. However, the holders of 10% or more of the
outstanding shares may by written request require a meeting to consider the
removal of Trustees by a vote of two-thirds of the shares then outstanding cast
in person or by proxy at such meeting. The Fund will assist such holders in
communicating with other shareholders of the Fund to the extent required by the
1940 Act. More detailed information concerning the Fund is set forth in the
Statement of Additional Information.
 
  The Fund's Declaration of Trust provides that no Trustee, officer or
shareholder of the Fund shall be held to any personal liability, nor shall
resort be had to their private property for the satisfaction of any obligation
or liability of the Fund but the assets of the Fund only shall be liable.
 
- ------------------------------------------------------------------------------
ADDITIONAL INFORMATION
- ------------------------------------------------------------------------------
 
  This Prospectus and the Statement of Additional Information do not contain all
the information set forth in the Registration Statement filed by the Fund with
the SEC under the Securities Act of 1933. Copies of the Registration Statement
may be obtained at a reasonable charge from the SEC or may be examined, without
charge, at the office of the SEC in Washington, D.C.
 
  The fiscal year end of the Fund is December 31. The Fund sends to its
shareholders at least semi-annually reports showing the Fund's portfolio and
other information. An annual report, containing financial statements audited by
the Fund's independent accountants, is sent to shareholders each year. After the
end of each year, shareholders will receive federal income tax information
regarding dividends and capital gains distributions.
 
  Shareholder inquiries should be directed to the Van Kampen American Capital
Comstock Fund, One Parkview Plaza, Oakbrook Terrace, Illinois 60181, Attn:
Correspondence.
 
  For Automated Telephone Service which provides 24-hour direct dial access to
Fund facts and shareholder account information, dial (800) 847-2424. For
inquiries through Telecommunications Device for the Deaf (TDD) dial (800)
421-2833.
 
                                       49
<PAGE>   50

<TABLE>
<S>                                      <C>
                                         VAN KAMPEN AMERICAN CAPITAL        
                                         COMSTOCK FUND                      
                                         One Parkview Plaza                 
                                         Oakbrook Terrace, IL 60181         
                                                                            
                                         Investment Adviser                 
                                                                            
                                         VAN KAMPEN AMERICAN CAPITAL        
                                         ASSET MANAGEMENT, INC.             
                                         One Parkview Plaza                 
                                         Oakbrook Terrace, IL 60181         
                                                                            
                                         Distributor                        
                                                                            
                                         VAN KAMPEN AMERICAN CAPITAL        
                                         DISTRIBUTORS, INC.                 
                                         One Parkview Plaza                 
                                         Oakbrook Terrace, IL 60181         
                                                                            
                                         Transfer Agent                     
                                                                            
                                         ACCESS INVESTOR SERVICES, INC.     
                                         P.O. Box 418256                    
                                         Kansas City, MO 64141-9256         
                                         Attn: Van Kampen American Capital  
EXISTING SHAREHOLDERS--                  Comstock Fund                          
FOR INFORMATION ON YOUR                                                     
EXISTING ACCOUNT PLEASE CALL             Custodian                          
THE FUND'S TOLL-FREE                                                        
NUMBER--(800) 341-2911                   STATE STREET BANK AND              
                                         TRUST COMPANY                      
PROSPECTIVE INVESTORS--CALL              225 West Franklin Street           
YOUR BROKER OR (800) 421-5666            P.O. Box 1713                      
                                         Boston, MA 02105-1713              
DEALERS--FOR DEALER                      Attn: Van Kampen American Capital   
INFORMATION, SELLING                           Comstock Fund                
AGREEMENTS, WIRE ORDERS, OR                                                 
REDEMPTIONS CALL THE                     Legal Counsel                      
DISTRIBUTOR'S TOLL-FREE                                                     
NUMBER--(800) 421-5666                   SKADDEN, ARPS, SLATE,              
                                         MEAGHER & FLOM (ILLINOIS)          
FOR SHAREHOLDER AND DEALER               333 West Wacker Drive              
INQUIRIES THROUGH                        Chicago, IL 60606                  
TELECOMMUNICATIONS DEVICE                
FOR THE DEAF (TDD)                       Independent Accountants
DIAL (800) 421-2833                      
                                         PRICE WATERHOUSE LLP
FOR AUTOMATED TELEPHONE                  200 East Randolph Drive            
SERVICES DIAL (800) 847-2424             Chicago, IL 60601                
</TABLE>
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
          
                                                               
<PAGE>   51
 
 ------------------------------------------------------------------------------
 
                                 COMSTOCK FUND
 
 ------------------------------------------------------------------------------
 
                              P R O S P E C T U S
 
                                 APRIL 30, 1998
 
        ------  A WEALTH OF KNOWLEDGE - A KNOWLEDGE OF WEALTH  ------
                          VAN KAMPEN AMERICAN CAPITAL
    ------------------------------------------------------------------------


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