MORGAN STANLEY WITTER DEAN AGGRESSIVE EQUITY FUND
497, 1999-01-21
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<PAGE>
              PROSPECTUS
              DECEMBER 23, 1998
 
              Morgan Stanley Dean Witter Aggressive Equity Fund (the "Fund") is
an open-end, diversified management investment company whose investment
objective is capital growth. The Fund seeks to achieve this objective by
investing primarily in equity securities of companies that are covered by Morgan
Stanley Dean Witter Equity Research and that the Fund's Investment Manager
believes offer the potential for superior earnings growth. See "Investment
Objective and Policies."
 
                 INITIAL OFFERING--Shares of the Fund are being offered in an
underwriting by Morgan Stanley Dean Witter Distributors Inc. at $10.00 per share
for Class B, Class C and Class D shares with all proceeds going to the Fund and
at $10.00 per share plus a sales charge for Class A shares with the sales charge
paid to the Underwriter and the net asset value of $10.00 per share going to the
Fund. The initial offering will run from approximately January 25, 1999 through
February 19, 1999.
 
                 CONTINUOUS OFFERING--A continuous offering of the shares of the
Fund will commence approximately two weeks after the closing date of the initial
offering which is anticipated for February 24, 1999. Class B, Class C and Class
D shares will be priced at the net asset value per share and Class A shares will
be priced at the net asset value per share plus a sales charge, in each case as
next determined following receipt of an order.
 
                 The Fund offers four classes of shares (each, a "Class"), each
with a different combination of sales charges, ongoing fees and other features.
The different distribution arrangements permit an investor to choose the method
of purchasing shares that the investor believes is most beneficial given the
amount of the purchase, the length of time the investor expects to hold the
shares and other relevant circumstances. (See "Purchase of Fund
Shares--Alternative Purchase Arrangements.")
 
                 The Fund intends to suspend the offering of its shares to new
investors whenever the Fund's Investment Manager determines that doing so is in
the best interests of prudent portfolio management. During any such suspension,
the Fund will continue to offer its shares to current shareholders. Currently,
the Fund anticipates suspending the offering of its shares to new investors if
its net assets reach a level of approximately $2 billion, unless the Investment
Manager determines that the continued offering of the Fund's shares is
consistent at that time with prudent portfolio management. Following any such
suspension, the Fund will recommence offering its shares to new investors from
time to time as may be consistent with prudent portfolio management.
 
     MORGAN STANLEY DEAN WITTER DISTRIBUTORS INC.
      DISTRIBUTOR
 
      TABLE OF CONTENTS
 
Prospectus Summary/2
Summary of Fund Expenses/4
The Fund and its Management/6
Investment Objective and Policies/6
  Risk Considerations and Investment Practices/9
Investment Restrictions/17
Underwriting/17
Purchase of Fund Shares--Continuous Offering/18
Shareholder Services/29
Redemptions and Repurchases/32
Dividends, Distributions and Taxes/33
Performance Information/34
Additional Information/35
 
               This Prospectus sets forth concisely the information you should
know before investing in the Fund. It should be read and retained for future
reference. Additional information about the Fund is contained in the Statement
of Additional Information, dated December 23, 1998, which has been filed with
the Securities and Exchange Commission, and which is available at no charge upon
request of the Fund at the address or telephone numbers listed on this page. The
Statement of Additional Information is incorporated herein by reference.
 
SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK, AND THE SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT
INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD, OR ANY OTHER AGENCY.
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
 
    Morgan Stanley Dean Witter
    Aggressive Equity Fund
    Two World Trade Center
    New York, New York 10048
    (212) 392-2550 or
    (800) 869-NEWS (toll free)
<PAGE>
PROSPECTUS SUMMARY
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<TABLE>
<S>                 <C>
The                 The Fund is organized as a Trust commonly referred to as a Massachusetts business trust, and is an open-end,
Fund                diversified management investment company investing primarily in equity securities of companies that are covered
                    by Morgan Stanley Dean Witter Equity Research ("MSDW Equity Research") and that the Fund's Investment Manager
                    believes offer the potential for superior earnings growth.
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Shares Offered      Shares of beneficial interest with $0.01 par value (see page 35). The Fund offers four Classes of shares, each
                    with a different combination of sales charges, ongoing fees and other features (see page 18).
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Initial Offering    Shares of the Fund are being offered in an underwriting by Morgan Stanley Dean Witter Distributors Inc. at
                    $10.00 per share for each of Class B, Class C and Class D and $10.00 per share plus a sales charge for Class A.
                    The minimum purchase for each Class is 100 shares; however, Class D shares are only available to persons who are
                    otherwise qualified to purchase such shares. The initial offering will run approximately from January 25, 1999
                    through February 19, 1999. The closing will take place on February 24, 1999 or such other date as may be agreed
                    upon by Morgan Stanley Dean Witter Distributors Inc. and the Fund (the "Closing Date"). Shares will not be
                    issued and dividends will not be declared by the Fund until after the Closing Date. If any orders received
                    during the initial offering period are accompanied by payment, such payment will be returned unless an
                    accompanying request for investment in a Morgan Stanley Dean Witter money market fund is received at the time
                    the payment is made. Any purchase order may be cancelled at any time prior to the Closing Date. The Fund intends
                    to suspend the offering of its shares to new investors (during the initial or continuous offering) whenever the
                    Fund's Investment Manager determines that doing so is in the best interests of prudent portfolio management.
                    During any such suspension, the Fund will continue to offer its shares to current shareholders. Currently, the
                    Fund anticipates suspending the offering of its shares to new investors if its net assets reach a level of
                    approximately $2 billion, unless the Investment Manager determines that the continued offering of the Fund's
                    shares is consistent at that time with prudent portfolio management. Subsequently, the Fund will recommence
                    offering its shares to new investors from time to time as may be consistent with prudent portfolio management
                    (see page 18).
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Continuous          A continuous offering of shares of the Fund will commence within approximately two weeks after the Closing Date,
Offering/           unless the Fund suspends the offering of its shares to new investors. The minimum initial investment for each
Minimum             Class of shares is $1,000 ($100 if the account is opened through EasyInvest-SM-). Class D shares are only
Purchase            available to persons investing $5 million ($25 million for certain employee benefit plans) or more and to
                    certain other limited categories of investors. For the purpose of meeting the minimum $5 million (or $25
                    million) investment for Class D shares, and subject to the $1,000 minimum initial investment for each Class of
                    the Fund, an investor's existing holdings of Class A and Class D shares and shares of funds for which Morgan
                    Stanley Dean Witter Advisors Inc. serves as investment manager ("Morgan Stanley Dean Witter Funds") that are
                    sold with a front-end sales charge, and concurrent investments in Class D shares of the Fund and other Morgan
                    Stanley Dean Witter Funds that are multiple class funds will be aggregated. The minimum subsequent investment is
                    $100 (see page 18).
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Investment          The investment objective of the Fund is capital growth (see page 6).
Objective
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Investment          Morgan Stanley Dean Witter Advisors Inc., the Investment Manager of the Fund, and its wholly-owned subsidiary,
Manager             Morgan Stanley Dean Witter Services Company Inc., serve in various investment management, advisory, management
                    and administrative capacities to 100 investment companies and other portfolios with assets of approximately $121
                    billion at November 30, 1998.
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Management          The Investment Manager receives a monthly fee at the annual rate of 0.75% of the Fund's average daily net assets
Fee                 (see page 6).
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Underwriter and     Morgan Stanley Dean Witter Distributors Inc. is the Fund's Underwriter and Distributor of the Fund's shares. The
Distributor         Fund has adopted a distribution plan pursuant to Rule 12b-1 under the Investment Company Act (the "12b-1 Plan")
and                 with respect to the distribution fees paid by the Class A, Class B and Class C shares of the Fund to the
Distribution Fee    Distributor. The entire 12b-1 fee payable by Class A and a portion of the 12b-1 fee payable by each of Class B
                    and Class C equal to 0.25% of the average daily net assets of the Class are currently each characterized as a
                    service fee within the meaning of the National Association of Securities Dealers, Inc. guidelines. The remaining
                    portion of the 12b-1 fee, if any, is characterized as an asset-based sales charge (see pages 18 and 27).
</TABLE>
 
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                                       2
<PAGE>
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<TABLE>
<S>                 <C>
Alternative         Four classes of shares are offered:
Purchase
Arrangements        - Class A shares are offered with a front-end sales charge, starting at 5.25% and reduced for larger purchases.
                    Investments of $1 million or more (and investments by certain other limited categories of investors) are not
                    subject to any sales charge at the time of purchase but a contingent deferred sales charge ("CDSC") of 1.0% may
                    be imposed on redemptions within one year of purchase. The Fund is authorized to reimburse the Distributor for
                    specific expenses incurred in promoting the distribution of the Fund's Class A shares and servicing shareholder
                    accounts pursuant to the Fund's 12b-1 Plan. Reimbursement may in no event exceed an amount equal to payments at
                    an annual rate of 0.25% of average daily net assets of the Class (see pages 18, 22 and 27).
                    - Class B shares are offered without a front-end sales charge, but will in most cases be subject to a CDSC
                    (scaled down from 5.0% to 1.0%) if redeemed within six years after purchase. The CDSC will be imposed on any
                    redemption of shares if after such redemption the aggregate current value of a Class B account with the Fund
                    falls below the aggregate amount of the investor's purchase payments made during the six years preceding the
                    redemption. Class B shares are also subject to a 12b-1 fee assessed at the annual rate of 1.0% of the average
                    daily net assets of Class B. Class B shares convert to Class A shares approximately ten years after the date of
                    the original purchase (see pages 18, 24 and 27).
                    - Class C shares are offered without a front-end sales charge, but will in most cases be subject to a CDSC of
                    1.0% if redeemed within one year after purchase. The Fund is authorized to reimburse the Distributor for
                    specific expenses incurred in promoting the distribution of the Fund's Class C shares and servicing shareholder
                    accounts pursuant to the Fund's 12b-1 Plan. Reimbursement may in no event exceed an amount equal to payments at
                    an annual rate of 1.0% of average daily net assets of the Class of the Fund (see pages 18, 26 and 27).
                    - Class D shares are offered only to investors meeting an initial investment minimum of $5 million ($25 million
                    for certain employee benefit plans) and to certain other limited categories of investors. Class D shares are
                    offered without a front-end sales charge or CDSC and are not subject to any 12b-1 fee (see pages 18, 26 and 27).
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Dividends and       Dividends from net investment income and distributions from net capital gains, if any, are paid at least once
Capital Gains       per year. The Fund may, however, determine to retain all or part of any long-term net capital gains in any year
Distributions       for reinvestment. Dividends and capital gains distributions paid on shares of a Class are automatically
                    reinvested in additional shares of the same Class at net asset value unless the shareholder elects to receive
                    cash. Shares acquired by dividend and distribution reinvestment will not be subject to any sales charge or CDSC
                    (see pages 29 and 33).
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Redemption          Shares of the Fund are redeemable by the shareholder at net asset value less any applicable CDSC on Class A,
                    Class B or Class C shares. An account may be involuntarily redeemed if the total value of the account is less
                    than $100 or, if the account was opened through EasyInvest-SM-, if after twelve months the shareholder has
                    invested less than $1,000 in the account (see page 32).
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Risk                An investment in the Fund should be considered a long-term holding and subject to all the risks associated with
Considerations      investing in equity securities of U.S. and foreign companies, including small and medium capitalization
                    companies. The net asset value of the Fund's shares will fluctuate with changes in the market value of its
                    portfolio securities, and therefore, will increase or decrease due to a variety of economic, market or political
                    factors which cannot be predicted. It should be recognized that foreign securities and markets in which the Fund
                    may invest pose different and greater risks than those customarily associated with domestic securities and their
                    markets such as fluctuations in foreign currency exchange rates, foreign securities exchange controls and
                    foreign tax rates. The Fund may enter into repurchase agreements, may purchase securities on a when-issued,
                    delayed delivery or forward commitment basis, may purchase securities on a "when, as and if issued" basis, may
                    lend its portfolio securities and may utilize certain investment techniques including options and futures
                    transactions and forward foreign currency exchange transactions which may be considered speculative in nature
                    and may involve greater risks than those customarily assumed by other investment companies which do not utilize
                    such instruments. (See pages 9-16).
</TABLE>
 
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  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
                ELSEWHERE IN THE PROSPECTUS AND IN THE STATEMENT
                           OF ADDITIONAL INFORMATION.
 
                                       3
<PAGE>
SUMMARY OF FUND EXPENSES
- --------------------------------------------------------------------------------
 
    The following table illustrates all expenses and fees that a shareholder of
the Fund will incur. The expenses and fees set forth in the table are based on
the fees and estimated other expenses anticipated for the first complete fiscal
year of the Fund.
 
<TABLE>
<CAPTION>
                                                                                   CLASS A    CLASS B    CLASS C    CLASS D
                                                                                  ---------   -------   ---------   -------
<S>                                                                               <C>         <C>       <C>         <C>
SHAREHOLDER TRANSACTION EXPENSES
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Maximum Sales Charge Imposed on Purchases (as a percentage of offering price)...   5.25%(1)    None      None        None
Sales Charge Imposed on Dividend Reinvestments..................................   None        None      None        None
Maximum Contingent Deferred Sales Charge (as a percentage of original purchase
  price or redemption proceeds).................................................   None(2)     5.00%(3)  1.00%(4)    None
Redemption Fees.................................................................   None        None      None        None
Exchange Fee....................................................................   None        None      None        None
 
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS)
- --------------------------------------------------------------------------------
Management Fees.................................................................   0.75%       0.75%     0.75%       0.75%
12b-1 Fees (5) (6)..............................................................   0.25%       1.00%     1.00%       None
Other Expenses*.................................................................   0.35%       0.35%     0.35%       0.35%
Total Fund Operating Expenses* (7)..............................................   1.35%       2.10%     2.10%       1.10%
</TABLE>
 
- ------------
*  THE INVESTMENT MANAGER HAS UNDERTAKEN TO ASSUME ALL OPERATING EXPENSES
   (EXCEPT FOR BROKERAGE AND 12b-1 FEES) AND TO WAIVE THE COMPENSATION PROVIDED
   FOR IN THE INVESTMENT MANAGEMENT AGREEMENT UNTIL SUCH TIME AS THE FUND HAS
   $50 MILLION OF NET ASSETS OR UNTIL SIX MONTHS FROM COMMENCEMENT OF THE FUND'S
   OPERATIONS, WHICHEVER OCCURS FIRST. THE FEES AND EXPENSES DISCLOSED ABOVE DO
   NOT REFLECT THE ASSUMPTION OF ANY EXPENSES OR THE WAIVER OF ANY COMPENSATION
   BY THE INVESTMENT MANAGER.
(1) REDUCED FOR PURCHASES OF $25,000 AND OVER (SEE "PURCHASE OF FUND
    SHARES--INITIAL SALES CHARGE ALTERNATIVE--CLASS A SHARES").
(2) INVESTMENTS THAT ARE NOT SUBJECT TO ANY SALES CHARGE AT THE TIME OF PURCHASE
    ARE SUBJECT TO A CDSC OF 1.00% THAT WILL BE IMPOSED ON REDEMPTIONS MADE
    WITHIN ONE YEAR AFTER PURCHASE, EXCEPT FOR CERTAIN SPECIFIC CIRCUMSTANCES
    (SEE "PURCHASE OF FUND SHARES--INITIAL SALES CHARGE ALTERNATIVE--CLASS A
    SHARES").
(3) THE CDSC IS SCALED DOWN TO 1.00% DURING THE SIXTH YEAR, REACHING ZERO
    THEREAFTER.
(4) ONLY APPLICABLE TO REDEMPTIONS MADE WITHIN ONE YEAR AFTER PURCHASE (SEE
    "PURCHASE OF FUND SHARES-- LEVEL LOAD ALTERNATIVE--CLASS C SHARES").
(5) THE 12b-1 FEE IS ACCRUED DAILY AND PAYABLE MONTHLY. THE ENTIRE 12b-1 FEE
    PAYABLE BY CLASS A AND A PORTION OF THE 12b-1 FEE PAYABLE BY EACH OF CLASS B
    AND CLASS C EQUAL TO 0.25% OF THE AVERAGE DAILY NET ASSETS OF THE CLASS ARE
    CURRENTLY EACH CHARACTERIZED AS A SERVICE FEE WITHIN THE MEANING OF NATIONAL
    ASSOCIATION OF SECURITIES DEALERS, INC. ("NASD") GUIDELINES AND ARE PAYMENTS
    MADE FOR PERSONAL SERVICE AND/OR MAINTENANCE OF SHAREHOLDER ACCOUNTS. THE
    REMAINDER OF THE 12b-1 FEE, IF ANY, IS AN ASSET-BASED SALES CHARGE, AND IS A
    DISTRIBUTION FEE PAID TO THE DISTRIBUTOR TO COMPENSATE IT FOR THE SERVICES
    PROVIDED AND THE EXPENSES BORNE BY THE DISTRIBUTOR AND OTHERS IN THE
    DISTRIBUTION OF THE FUND'S SHARES (SEE "PURCHASE OF FUND SHARES--PLAN OF
    DISTRIBUTION").
(6) UPON CONVERSION OF CLASS B SHARES TO CLASS A SHARES, SUCH SHARES WILL BE
    SUBJECT TO THE LOWER 12b-1 FEE APPLICABLE TO CLASS A SHARES. NO SALES CHARGE
    IS IMPOSED AT THE TIME OF CONVERSION OF CLASS B SHARES TO CLASS A SHARES.
    CLASS C SHARES DO NOT HAVE A CONVERSION FEATURE AND, THEREFORE, ARE SUBJECT
    TO AN ONGOING 1.00% DISTRIBUTION FEE (SEE "PURCHASE OF FUND
    SHARES--ALTERNATIVE PURCHASE ARRANGEMENTS").
(7) "TOTAL FUND OPERATING EXPENSES," AS SHOWN ABOVE WITH RESPECT TO EACH CLASS,
    ARE BASED UPON THE SUM OF MANAGEMENT AND 12b-1 FEES, AND ESTIMATED "OTHER
    EXPENSES."
 
                                       4
<PAGE>
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<TABLE>
<CAPTION>
EXAMPLE                                                                                                   1 Year       3 Years
- ------------------------------------------------------------------------------------------------------  -----------  -----------
<S>                                                                                                     <C>          <C>
You would pay the following expenses on a $1,000 investment in the Fund assuming (1) a 5% annual
 return and (2) redemption at the end of each time period:
    Class A...........................................................................................   $      66    $      93
    Class B...........................................................................................   $      71    $      96
    Class C...........................................................................................   $      31    $      66
    Class D...........................................................................................   $      11    $      35
 
You would pay the following expenses on the same $1,000 investment in the Fund assuming no redemption
 at the end of the period:
    Class A...........................................................................................   $      66    $      93
    Class B...........................................................................................   $      21    $      66
    Class C...........................................................................................   $      21    $      66
    Class D...........................................................................................   $      11    $      35
</TABLE>
 
    THE ABOVE EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR
FUTURE EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF THE FUND MAY BE GREATER OR
LESS THAN THOSE SHOWN.
 
    The purpose of this table is to assist the investor in understanding the
various costs and expenses that an investor in the Fund will bear directly or
indirectly. For a more complete description of these costs and expenses, see
"The Fund and its Management," "Purchase of Fund Shares--Plan of Distribution"
and "Redemptions and Repurchases."
 
    Long-term shareholders of Class B and Class C may pay more in sales charges,
including distribution fees, than the economic equivalent of the maximum
front-end sales charges permitted by the NASD.
 
                                       5
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
    Morgan Stanley Dean Witter Aggressive Equity Fund (the "Fund") is an
open-end, diversified management investment company. The Fund is a trust of the
type commonly known as a "Massachusetts business trust" and was organized under
the laws of the Commonwealth of Massachusetts on October 29, 1997 under the name
Dean Witter Research Trust.
 
    Morgan Stanley Dean Witter Advisors Inc. ("MSDW Advisors" or the "Investment
Manager"), whose address is Two World Trade Center, New York, New York 10048, is
the Fund's Investment Manager. The Investment Manager is a wholly-owned
subsidiary of Morgan Stanley Dean Witter & Co., a preeminent global financial
services firm that maintains leading market positions in each of its three
primary businesses--securities, asset management and credit services. The
Investment Manager, which was incorporated in July 1992, under the name Dean
Witter InterCapital Inc., changed its name to Morgan Stanley Dean Witter
Advisors Inc. on June 22, 1998.
 
    MSDW Advisors and its wholly-owned subsidiary, Morgan Stanley Dean Witter
Services Company Inc. ("MSDW Services"), serve in various investment management,
advisory, management and administrative capacities to 100 investment companies,
28 of which are listed on the New York Stock Exchange, with combined assets of
approximately $116.5 billion as of November 30, 1998. The Investment Manager
also manages and advises portfolios of pension plans, other institutions and
individuals which aggregated approximately $4.5 billion at such date.
 
    The Fund has retained the Investment Manager to provide administrative
services, manage its business affairs and manage the investment of the Fund's
assets. MSDW Advisors has retained MSDW Services to perform the aforementioned
administrative services for the Fund.
 
    As full compensation for the services and facilities furnished to the Fund
and for expenses of the Fund incurred by the Investment Manager, the Fund pays
the Investment Manager monthly compensation calculated daily by applying the
annual rate of 0.75% of the Fund's net assets. The Fund's expenses include: the
fee of the Investment Manager, the fee pursuant to the Plan of Distribution (see
"Purchase of Fund Shares"); taxes; transfer agent and custodian fees; auditing
fees; and certain legal fees, and printing and other expenses relating to the
Fund's operations which are not expressly assumed by the Investment Manager
under its Investment Management Agreement with the Fund. The Investment Manager
has agreed to assume all operating expenses (except for brokerage and 12b-1
fees) for the Fund until such time as the Fund has $50 million of net assets or
until six months from commencement of the Fund's operations, whichever occurs
first.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
    The investment objective of the Fund is capital growth. There is no
assurance that the objective of the Fund will be achieved. This objective is a
fundamental policy and may not be changed without shareholder approval.
 
    The Fund seeks to achieve its investment objective by investing, under
normal circumstances, at least 65% of its total assets in the equity securities
of companies that, at the time of acquisition, are covered by Morgan Stanley
Dean Witter Equity Research ("MSDW Equity Research") and that the Fund's
Investment Manager believes offer the potential for superior earnings growth. In
selecting securities for investment, the Fund's Investment Manager utilizes a
process, known as sector rotation, that emphasizes industry selection over
individual company selection. The Investment Manager begins the process by
seeking to identify what stage of the business cycle the economy is in
 
                                       6
<PAGE>
and which industry groups have historically outperformed the over-all market
during that stage of the cycle. For example, the Investment Manager looks for
industries that tend to have the highest relative earnings growth at that point
of the business cycle. The Investment Manager also attempts to identify secular
trends, such as shifting demographics or technological developments, that could
add clarity to its economic analysis.
 
    After identifying industries, the Investment Manager then selects individual
companies primarily from the universe of companies covered by MSDW Equity
Research. This selection is based on the Investment Manager's own company
analysis, and on its review of the research reports and analysis from MSDW
Equity Research. In addition, the Investment Manager will use as part of its
selection process the research reports and analysis from the equity research
departments of other recognized securities firms. MSDW Equity Research, an
affilaite of the Investment Manager, has no role in the selection of individual
securities in the Fund's portfolio. The company analysis performed by the
Investment Manager will seek to identify companies with the potential for strong
relative earnings growth through an analysis of prospective company fundamentals
and valuation screens.
 
    The Investment Manager has no general criteria as to market capitalization,
asset size, earnings or industry type when selecting securities for investment
by the Fund. The Fund may also invest in small and medium sized companies which
involves greater risks than is customarily associated with investing in larger,
more established companies. The Investment Manager can take advantage of
short-term opportunities that are consistent with the Fund's investment
objective, and may sell a recently purchased security that has appreciated in
value.
 
    MSDW EQUITY RESEARCH.  MSDW Equity Research is recognized as a world leader
in global financial research and provides comprehensive research and in-depth
knowledge about general markets and specific companies from around the world.
Specifically, MSDW Equity Research's analysts and strategists presently evaluate
approximately 2,100 companies in 21 industry sectors worldwide ("MSDW Covered
Companies"). As used herein, "MSDW Covered Companies" includes any company that,
at the time of investment, is a company as to which MSDW Equity Research has
assigned a rating--currently Strong Buy, Outperform, Neutral or
Underperform--including any company as to which MSDW Equity Research has
assigned such a rating but (i) for regulatory or other reasons may be at any
time restricted in its ability to publish research or (ii) has temporarily
suspended publishing research due to transitions in the composition of its
industry analyst team. While MSDW Equity Research is an affiliate of the
Investment Manager, MSDW Equity Research has no role in the selection of
individual securities for the Fund's portfolio. The coverage of a company by
MSDW Equity Research is not intended to be, and should not be viewed as, a
research recommendation that an investor buy, sell or hold securities of such
company. In addition, MSDW Equity Research is under no obligation to publish or
continue publishing research with respect to any company, and may discontinue
publishing such research at any time. Also, MSDW Equity Research may reduce the
total number of companies for which it provides research coverage, resulting in
a smaller universe of companies from which the Fund primarily selects its
investments.
 
    The equity securities in which the Fund may invest include common stocks,
preferred stocks, convertible securities, rights and warrants, and other equity
securities of any U.S. or foreign company; provided, however, that not more than
25% of the Fund's net assets will be invested in foreign equity or fixed income
securities denominated in a foreign currency and traded primarily in non-U.S.
markets.
 
    Up to 35% of the Fund's total assets may be invested in (i) U.S. and foreign
equity securities not covered by MSDW Equity Research, (ii) fixed-income
securities of U.S. companies,
 
                                       7
<PAGE>
(iii) fixed-income securities of foreign companies and governments and
international organizations, (iv) U.S. Government securities, and (v) money
market instruments; provided, however, that no more than 5% of the Fund's net
assets may be invested in non-investment grade debt securities and subject to
the Fund's overall limitation on foreign securities described above. (For a
discussion of the risks of investing in each of these securities, see "Risk
Considerations and Investment Practices" below.) In addition, this portion of
the Fund's portfolio will consist of various other financial instruments such as
forward foreign exchange contracts, futures contracts and options as set forth
below.
 
    Fixed-income securities in which the Fund may invest include domestic and
foreign corporate notes and bonds, obligations issued or guaranteed by the
United States Government, its agencies and instrumentalities and obligations of
foreign governments and international organizations. The non-governmental debt
securities in which the Fund may invest may include: (a) domestic and foreign
corporate debt securities, including bonds, notes and commercial paper, rated in
the four highest categories by a nationally recognized statistical rating
organization ("NRSRO") including Moody's Investors Service, Inc. ("Moody's"),
Standard & Poor's Corporation ("S&P"), Duff and Phelps, Inc. and Fitch Investors
Service, Inc., or, if unrated, of comparable quality as determined by the
Investment Manager; and (b) bank obligations, including CDs, banker's
acceptances and time deposits, issued by banks with a long-term CD rating in one
of the four highest categories by a NRSRO. Investments in securities rated
within the four highest rating categories by a NRSRO are considered "investment
grade." However, such securities rated within the fourth highest rating category
by a NRSRO have speculative characteristics and, therefore, changes in economic
conditions or other circumstances are more likely to weaken the capacity of
their issuers to make principal and interest payments than would be the case
with investments in securities with higher credit ratings. Where a fixed-income
security is not rated by a NRSRO, the Investment Manager will make a
determination of its creditworthiness and may deem it to be investment grade. In
addition, up to 5% of the Fund's net assets may be invested in non-investment
grade debt securities, or "junk bonds." If the Fund's holdings in non-investment
grade debt securities increase to more than 5% of its net assets as a result of
a fixed-income non-convertible security held by the Fund being subsequently
downgraded by a rating agency below investment grade, the Fund will sell such
security as soon as practicable without undue market or tax consequences to the
Fund. See the Appendix to the Statement of Additional Information for a
discussion of ratings of fixed-income securities.
 
    The money market instruments in which the Fund may invest are securities
issued or guaranteed by the U.S. Government (Treasury bills, notes and bonds
(including zero coupon securities)); bank obligations; Eurodollar certificates
of deposit; obligations of savings institutions; fully insured certificates of
deposit; and commercial paper rated within the two highest grades by Moody's or
S&P or, if not rated, issued by a company having an outstanding debt issue rated
at least AA by S&P or Aa by Moody's. Such securities may be used to invest
uncommitted cash balances.
 
    There may be periods during which market conditions warrant reduction of
some or all of the Fund's securities holdings. During such periods, the Fund may
adopt a temporary "defensive" posture in which up to 100% of its net assets are
invested in cash or money market instruments.
 
    The Fund may also purchase or sell futures contracts or options thereon and
listed and over-the-counter options contracts on securities and indices, may
enter into repurchase agreements, purchase private placements, zero coupon
securities, forward foreign currency exchange contracts, and securities of other
investment companies, purchase securities on a when-issued, delayed delivery or
forward commitment basis, purchase securities on a
 
                                       8
<PAGE>
"when, as and if issued" basis, and lend its portfolio securities, as discussed
under "Risk Considerations and Investment Practices" below.
 
RISK CONSIDERATIONS AND INVESTMENT PRACTICES
 
    The net asset value of the Fund's shares will fluctuate with changes in the
market value of its portfolio securities. The market value of the Fund's
portfolio securities will increase or decrease due to a variety of economic,
market or political factors which cannot be predicted. A general description and
the risks involved of the various investment practices and techniques which the
Fund may engage in is set forth below. A more detailed discussion can be found
in the Fund's Statement of Additional Information.
 
    The performance of the Fund will depend upon whether the Investment Manager
is successful in pursuing the Fund's investment strategy. MSDW Equity Research
is under no obligation to publish or continue publishing research with respect
to any company, and may cease publishing such research at any time. Also, MSDW
Equity Research may reduce the total number of companies for which it provides
research coverage, resulting in a smaller universe of companies from which the
Fund primarily selects its investments.
 
    STOCKS OF SMALLER AND MEDIUM SIZED COMPANIES.  The Fund's ability to invest
in smaller and medium sized companies carries more risk than investments in
larger companies. While some of the Fund's holdings in these companies may be
listed on a national securities exchange, such securities are more likely to be
traded in the over-the-counter market. The low market liquidity of these
securities may have an adverse impact on the Fund's ability to sell certain
securities at favorable prices and may also make it difficult for the Fund to
obtain market quotations based on actual trades, for purposes of valuing the
Fund's portfolio securities. Investing in lesser-known, smaller and medium
capitalization companies involves greater risk of volatility of the Fund's net
asset value than is customarily associated with larger, more established
companies. Often smaller and medium capitalization companies and the industries
in which they are focused are still evolving and, while this may offer better
growth potential than larger, more established companies, it also may make them
more sensitive to changing market conditions.
 
    FOREIGN SECURITIES.  Foreign securities investments may be affected by
changes in currency rates or exchange control regulations, changes in
governmental administration or economic or monetary policy (in the United States
and abroad) or changed circumstances in dealings between nations. Fluctuations
in the relative rates of exchange between different currencies will affect the
value of the Fund's investments. Changes in foreign currency exchange rates
relative to the U.S. dollar will affect the U.S. dollar value of the Fund's
assets denominated in that currency and thereby impact upon the Fund's total
return on such assets. When purchasing foreign securities, the Fund will
generally enter into foreign currency exchange transactions or forward foreign
exchange contracts to facilitate settlement. The Fund will utilize forward
foreign exchange contracts in these instances as an attempt to limit the effect
of changes in the relationship between the U.S. dollar and the foreign currency
during the period between the trade date and settlement date for the
transaction.
 
    Foreign currency exchange rates are determined by forces of supply and
demand on the foreign exchange markets. These forces are themselves affected by
the international balance of payments and other economic and financial
conditions, government intervention, speculation and other factors. Moreover,
foreign currency exchange rates may be affected by the regulatory control of the
exchanges on which the currencies trade. The foreign currency transactions of
the Fund will be conducted on a spot basis or through forward contracts or
futures contracts (see below). The Fund may incur certain costs in connection
with these currency transactions.
 
    Investments in foreign securities will also occasion risks relating to
political and economic devel-
 
                                       9
<PAGE>
opments abroad, including the possibility of expropriations or confiscatory
taxation, limitations on the use or transfer of Fund assets and any effects of
foreign social, economic or political instability. Foreign companies are not
subject to the regulatory requirements of U.S. companies and, as such, there may
be less publicly available information about such companies. Moreover, foreign
companies are not subject to uniform accounting, auditing and financial
reporting standards and requirements comparable to those applicable to U.S.
companies.
 
    Securities of foreign issuers may be less liquid than comparable securities
of U.S. issuers and, as such, their price changes may be more volatile.
Furthermore, foreign exchanges and broker-dealers are generally subject to less
government and exchange scrutiny and regulation than their American
counterparts. Brokerage commissions, dealer concessions and other transaction
costs may be higher on foreign markets than in the U.S. In addition, differences
in clearance and settlement procedures on foreign markets may occasion delays in
settlements of Fund trades effected in such markets. Inability to dispose of
portfolio securities due to settlement delays could result in losses to the Fund
due to subsequent declines in value of such securities and the inability of the
Fund to make intended security purchases due to settlement problems could result
in a failure of the Fund to make potentially advantageous investments.
 
    Many European countries are about to adopt a single European Currency, the
euro (the "Euro Conversion"). The consequences of the Euro Conversion for
foreign exchange rates, interest rates and the value of European Securities
eligible for purchase by the Fund are presently unclear. Such consequences may
adversely affect the value and/or increase the volatility of Securities held by
the Fund.
 
    DEPOSITORY RECEIPTS.  The Fund may invest in securities of foreign issuers
in the form of ADRs, including ADRs sponsored by persons other than the
underlying issuers ("unsponsored ADRs"), European Depository Receipts ("EDRs"),
Global Depository Receipts ("GDRs") or other similar securities convertible into
securities of foreign issuers. These securities may not necessarily be
denominated in the same currency as the securities into which they may be
converted. ADRs are receipts typically issued by a United States bank or trust
company evidencing ownership of the underlying securities. Generally, issuers of
the stock of unsponsored ADRs are not obligated to distribute material
information in the United States and, therefore, there may not be a correlation
between such information and the market value of such ADRs. EDRs are issued by a
European bank and GDRs are issued by a foreign bank or trust company and both
evidence ownership of the underlying foreign security. Generally, ADRs, in
registered form, are designated for use in the United States securities markets,
EDRs, in bearer form, are designated for use in European securities markets and
GDRs, in bearer form, are designated for use in European and other foreign
securities markets.
 
    CONVERTIBLE SECURITIES.  The Fund may invest 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 of the same or a different issuer within a particular period of
time at a specified price or formula. Convertible securities rank senior to
common stocks in a corporation's capital structure and, therefore, entail less
risk than the corporation's common stock. The value of a convertible security is
a function of its "investment value" (its value as if it did not have a
conversion privilege), and its "conversion value" (the security's worth if it
were to be exchanged for the underlying security, at market value, pursuant to
its conversion privilege).
 
    CORPORATE NOTES AND BONDS.  Values and yield of corporate bonds will
fluctuate with changes in prevailing interest rates and other factors.
Generally, as prevailing interest rates rise, the value of corporate notes and
bonds held by the Fund will fall. Securities with longer maturities generally
tend to produce higher yields and are subject to greater market fluctuation as a
result of changes in interest
 
                                       10
<PAGE>
rates than debt securities with shorter maturities. The Fund is not limited as
to the maturities of the debt securities in which it may invest.
 
    All fixed-income securities are subject to two types of risks; the credit
risk and the interest rate risk. The credit risk relates to the ability of the
issuer to meet interest or principal payments or both as they come due. The
interest rate risk refers to the fluctuations in the net asset value of any
portfolio of fixed-income securities resulting from the inverse relationship
between price and yield of fixed-income securities; that is, when the general
level of interest rates rises, the prices of outstanding fixed-income securities
decline, and when interest rates fall, prices rise.
 
    FORWARD FOREIGN CURRENCY EXCHANGE CONTRACTS. A forward foreign currency
exchange contract ("forward contract") involves an obligation to purchase or
sell a currency at a future date, which may be any fixed number of days from the
date of the contract agreed upon by the parties, at a price set at the time of
the contract. The Fund may enter into forward contracts as a hedge against
fluctuations in future foreign exchange rates.
 
    The Fund will enter into forward contracts under various circumstances. When
the Fund enters into a contract for the purchase or sale of a security
denominated in a foreign currency, it may, for example, desire to "lock in" the
price of the security in U.S. dollars or some other foreign currency which the
Fund is temporarily holding in its portfolio. By entering into a forward
contract for the purchase or sale, for a fixed amount of dollars or other
currency, of the amount of foreign currency involved in the underlying security
transactions, the Fund will be able to protect itself against a possible loss
resulting from an adverse change in the relationship between the U.S. dollar or
other currency which is being used for the security purchase and the foreign
currency in which the security is denominated during the period between the date
on which the security is purchased or sold and the date on which payment is made
or received.
 
    At other times, when, for example, it is believed that a particular foreign
currency may suffer a substantial decline against the U.S. dollar or some other
foreign currency, the Fund may enter into a forward contract to sell, for a
fixed amount of dollars or other currency, the amount of foreign currency
approximating the value of some or all of the Fund's portfolio securities (or
securities which the Fund has purchased for its portfolio) denominated in such
foreign currency. Under identical circumstances, the Fund may enter into a
forward contract to sell, for a fixed amount of U.S. dollars or other currency,
an amount of foreign currency other than the currency in which the securities to
be hedged are denominated approximating the value of some or all of the
portfolio securities to be hedged. This method of hedging, called
"cross-hedging," will be selected when it is determined that the foreign
currency in which the portfolio securities are denominated has insufficient
liquidity or is trading at a discount as compared with some other foreign
currency with which it tends to move in tandem.
 
    In addition, when the Fund anticipates purchasing securities at some time in
the future, and wishes to lock in the current exchange rate of the currency in
which those securities are denominated against the U.S. dollar or some other
foreign currency, it may enter into a forward contract to purchase an amount of
currency equal to some or all of the value of the anticipated purchase, for a
fixed amount of U.S. dollars or other currency. The Fund may, however, close out
the forward contract without purchasing the security which was the subject of
the "anticipatory" hedge.
 
    Lastly, the Fund is permitted to enter into forward contracts with respect
to currencies in which certain of its portfolio securities are denominated and
on which options have been written (see "Options and Futures Transactions").
 
    In all of the above circumstances, if the currency in which the Fund's
portfolio securities (or anticipated portfolio securities) are denominated rises
in value with respect to the currency which is being purchased (or sold), then
the Fund will have
 
                                       11
<PAGE>
realized fewer gains than had the Fund not entered into the forward contracts.
Moreover, the precise matching of the forward contract amounts and the value of
the securities involved will not generally be possible, since the future value
of such securities in foreign currencies will change as a consequence of market
movements in the value of those securities between the date the forward contract
is entered into and the date it matures. The Fund is not required to enter into
such transactions with regard to its foreign currency-denominated securities and
will not do so unless deemed appropriate by the Investment Manager.
 
    The Fund generally will not enter into a forward contract with a term of
greater than one year, although it may enter into forward contracts for periods
of up to five years. To the extent that the Fund enters into forward foreign
currency contracts to hedge against a decline in the value of portfolio holdings
denominated in a particular foreign currency resulting from currency
fluctuations, there is a risk that the Fund may nevertheless realize a gain or
loss as a result of currency fluctuations after such portfolio holdings are sold
if the Fund is unable to enter into an "offsetting" forward foreign currency
contract with the same party or another party. The Fund may be limited in its
ability to enter into hedging transactions involving forward contracts by the
Internal Revenue Code of 1986 (the "Code") requirements relating to
qualifications as a regulated investment company (see "Dividends, Distributions
and Taxes").
 
    OPTIONS AND FUTURES TRANSACTIONS.  The Fund may purchase and sell (write)
call and put options on (i) portfolio securities which are denominated in either
U.S. dollars or foreign currencies; (ii) stock indexes; and (iii) the U.S.
dollar and foreign currencies. Such options are or may in the future be listed
on several U.S. and foreign securities exchanges or may be traded in
over-the-counter transactions ("OTC options"). OTC options are purchased from or
sold (written) to dealers or financial institutions which have entered into
direct agreements with the Fund.
 
    The Fund is permitted to write covered call options on portfolio securities
and the U.S. dollar and foreign currencies, without limit, in order to hedge
against the decline in the value of a security or currency in which such
security is denominated (although such hedge is limited to the value of the
premium received) and to close out long call option positions. The Fund may
write covered put options, under which the Fund incurs an obligation to buy the
security (or currency) underlying the option from the purchaser of the put at
the option's exercise price at any time during the option period, at the
purchaser's election.
 
    The Fund may purchase listed and OTC call and put options in amounts
equalling up to 5% of its total assets. The Fund may purchase call options to
close out a covered call position or to protect against an increase in the price
of a security it anticipates purchasing or, in the case of call options on a
foreign currency, to hedge against an adverse exchange rate change of the
currency in which the security it anticipates purchasing is denominated
vis-a-vis the currency in which the exercise price is denominated. The Fund may
purchase put options on securities which it holds in its portfolio to protect
itself against a decline in the value of the security and to close out written
put positions in a manner similar to call option closing purchase transactions.
There are no other limits on the Fund's ability to purchase call and put options
other than compliance with the foregoing policies.
 
    The Fund may purchase and sell futures contracts that are currently traded,
or may in the future be traded, on U.S. and foreign commodity exchanges on
underlying portfolio securities, on any currency ("currency" futures), on U.S.
and foreign fixed-income securities ("interest rate" futures) and on such
indexes of U.S. or foreign equity or fixed-income securities as may exist or
come into being ("index" futures). The Fund may purchase or sell interest rate
futures contracts for the purpose of hedging some or all of the value of its
portfolio securities (or anticipated portfolio securities) against changes in
prevailing interest rates. The Fund may
 
                                       12
<PAGE>
purchase or sell index futures contracts for the purpose of hedging some or all
of its portfolio (or anticipated portfolio) securities against changes in their
prices. The Fund may purchase or sell currency futures contracts to hedge
against an anticipated rise or decline in the value of the currency in which a
portfolio security is denominated vis-a-vis another currency. As a futures
contract purchaser, the Fund incurs an obligation to take delivery of a
specified amount of the obligation underlying the contract at a specified time
in the future for a specified price. As a seller of a futures contract, the Fund
incurs an obligation to deliver the specified amount of the underlying
obligation at a specified time in return for an agreed upon price.
 
    The Fund also may purchase and write call and put options on futures
contracts which are traded on an exchange and enter into closing transactions
with respect to such options to terminate an existing position.
 
    New futures contracts, options and other financial products and various
combinations thereof continue to be developed. The Fund may invest in any such
futures, options or products as may be developed, to the extent consistent with
its investment objective and applicable regulatory requirements.
 
    RISKS OF OPTIONS AND FUTURES TRANSACTIONS. The Fund may close out its
position as writer of an option, or as a buyer or seller of a futures contract,
only if a liquid secondary market exists for options or futures contracts of
that series. There is no assurance that such a market will exist, particularly
in the case of OTC options, as such options may generally only be closed out by
entering into a closing purchase transaction with the purchasing dealer. Also,
exchanges may limit the amount by which the price of many futures contracts may
move on any day. If the price moves equal the daily limit on successive days,
then it may prove impossible to liquidate a futures position until the daily
limit moves have ceased.
 
    Futures contracts and options transactions may be considered speculative in
nature and may involve greater risks than those customarily assumed by other
investment companies which do not invest in such instruments. One such risk is
that the Investment Manager could be incorrect in its expectations as to the
direction or extent of various interest rate or price movements or the time span
within which the movements take place. For example, if the Fund sold futures
contracts for the sale of securities in anticipation of an increase in interest
rates, and then interest rates went down instead, causing bond prices to rise,
the Fund would lose money on the sale. Another risk which will arise in
employing futures contracts to protect against the price volatility of portfolio
securities is that the prices of securities, currencies and indexes subject to
futures contracts (and thereby the futures contract prices) may correlate
imperfectly with the behavior of the U.S. dollar cash prices of a fund's
portfolio securities and their denominated currencies. See the Statement of
Additional Information for a further discussion of these risks.
 
    INVESTMENT IN OTHER INVESTMENT VEHICLES. Under the Investment Company Act of
1940, as amended (the "Act"), the Fund generally may invest up to 10% of its
total assets in the aggregate in shares of other investment companies and up to
5% of its total assets in any one investment company, as long as that investment
does not represent more than 3% of the voting stock of the acquired investment
company at the time such shares are purchased. Notwithstanding the foregoing,
the Fund may invest all or substantially all of its assets in another registered
investment company having the same investment objective and policies and
substantially the same investment restrictions as the Fund. (See "Additional
Information--Master/Feeder Conversion.") Investment in other investment
companies or vehicles may be the sole or most practical means by which the Fund
can participate in certain foreign markets. Such investment may involve the
payment of substantial premiums above the value of such issuers' portfolio
securities, and is subject to limitations under the Act and market availability.
In addition, special tax considerations may apply. The
 
                                       13
<PAGE>
Fund does not intend to invest in such vehicles or funds unless, in the judgment
of the Investment Manager, the potential benefits of such investment justify the
payment of any applicable premium or sales charge. As a shareholder in an
investment company, the Fund would bear its ratable share of that investment
company's expenses, including its advisory and administration fees. At the same
time the Fund would continue to pay its own management fees and other expenses,
as a result of which the Fund and its shareholders in effect will be absorbing
duplicate levels of advisory fees with respect to investments in such other
investment companies.
 
    REPURCHASE AGREEMENTS.  The Fund may enter into repurchase agreements, which
may be viewed as a type of secured lending, and which typically involve the
acquisition by the Fund of debt securities, from a selling financial institution
such as a bank, savings and loan association or broker-dealer. The agreement
provides that the Fund will sell back to the institution, and that the
institution will repurchase, the underlying security at a specified price and at
a fixed time in the future, usually not more than seven days from the date of
purchase. While repurchase agreements involve certain risks not associated with
direct investments in debt securities, including the risks of default or
bankruptcy of the selling financial institution, the Fund follows procedures to
minimize such risks. These procedures include effecting repurchase transactions
only with large, well-capitalized and well-established financial institutions
and maintaining adequate collateralization. It is the current policy of the Fund
not to invest in repurchase agreements that do not mature within seven days if
any such investment, together with any other illiquid assets held by the Fund,
amounts to more than 15% of the Fund's net assets in keeping with its policy on
illiquid securities.
 
    ZERO COUPON SECURITIES.  A portion of the fixed-income securities purchased
by the Fund may be zero coupon securities. Such securities are purchased at a
discount from their face amount, giving the purchaser the right to receive their
full value at maturity. The interest earned on such securities is, implicitly,
automatically compounded and paid out at maturity. While such compounding at a
constant rate eliminates the risk of receiving lower yields upon reinvestment of
interest if prevailing interest rates decline, the owner of a zero coupon
security will be unable to participate in higher yields upon reinvestment of
interest received on interest-paying securities if prevailing interest rates
rise.
 
    A zero coupon security pays no interest to its holder during its life.
Therefore, to the extent the Fund invests in zero coupon securities, it will not
receive current cash available for distribution to shareholders. In addition,
zero coupon securities are subject to substantially greater price fluctuations
during periods of changing prevailing interest rates than are comparable
securities which pay interest on a current basis. Current federal tax law
requires that a holder (such as the Fund) of a zero coupon security accrue a
portion of the discount at which the security was purchased as income each year
even though the Fund receives no interest payments in cash on the security
during the year.
 
    WHEN-ISSUED AND DELAYED DELIVERY SECURITIES AND FORWARD COMMITMENTS.  From
time to time, in the ordinary course of business, the Fund may purchase
securities on a when-issued or delayed delivery basis or may purchase or sell
securities on a forward commitment basis. When such transactions are negotiated,
the price is fixed at the time of the commitment, but delivery and payment can
take place a month or more after the date of the commitment. There is no overall
limit on the percentage of the Fund's assets which may be committed to the
purchase of securities on a when-issued, delayed delivery or forward commitment
basis. An increase in the percentage of the Fund's assets committed to the
purchase of securities on a when-issued, delayed delivery or forward commitment
basis may increase the volatility of the Fund's net asset value.
 
    WHEN, AS AND IF ISSUED SECURITIES.  The Fund may purchase securities on a
"when, as and if issued" basis under which the issuance of the
 
                                       14
<PAGE>
security depends upon the occurrence of a subsequent event, such as approval of
a merger, corporate reorganization, leveraged buyout or debt restructuring. If
the anticipated event does not occur and the securities are not issued, the Fund
will have lost an investment opportunity. There is no overall limit on the
percentage of the Fund's assets which may be committed to the purchase of
securities on a "when, as and if issued" basis. An increase in the percentage of
the Fund's assets committed to the purchase of securities on a "when, as and if
issued" basis may increase the volatility of its net asset value.
 
    PRIVATE PLACEMENTS.  The Fund may invest up to 15% of its net assets in
securities which are subject to restrictions on resale because they have not
been registered under the Securities Act of 1933, as amended (the "Securities
Act"), or which are otherwise not readily marketable. (Securities eligible for
resale pursuant to Rule 144A under the Securities Act, and determined to be
liquid pursuant to the procedures discussed in the following paragraph, are not
subject to the foregoing restriction.) These securities are generally referred
to as private placements or restricted securities. Limitations on the resale of
such securities may have an adverse effect on their marketability, and may
prevent a fund from disposing of them promptly at reasonable prices. The Fund
may have to bear the expense of registering such securities for resale and the
risk of substantial delays in effecting such registration.
 
    The Securities and Exchange Commission has adopted Rule 144A under the
Securities Act, which permits a fund to sell restricted securities to qualified
institutional buyers without limitation. The Investment Manager, pursuant to
procedures adopted by the Trustees of the Fund, will make a determination as to
the liquidity of each restricted security purchased by the Fund. If a restricted
security is determined to be "liquid," such security will not be included within
the category "illiquid securities," which under current policy may not exceed
15% of the Fund's net assets. However, investing in Rule 144A securities could
have the effect of increasing the level of Fund illiquidity to the extent that
the Fund, at a particular point in time, may be unable to find qualified
institutional buyers interested in purchasing such securities.
 
    RIGHTS AND WARRANTS.  The Fund may acquire rights and/or warrants which are
attached to other securities in its portfolio, or which are issued as a
distribution by the issuer of a security held in its portfolio. Rights and/or
warrants are, in effect, options to purchase equity securities at a specific
price, generally valid for a specific period of time, and have no voting rights,
pay no dividends and have no rights with respect to the corporation issuing
them.
 
    LENDING OF PORTFOLIO SECURITIES.  Consistent with applicable regulatory
requirements, the Fund may lend its portfolio securities to brokers, dealers and
other financial institutions, provided that such loans are callable at any time
by the Fund (subject to certain notice provisions described in the Statement of
Additional Information), and are at all times secured by cash or money market
instruments, which are maintained in a segregated account pursuant to applicable
regulations and that are equal to at least the market value, determined daily,
of the loaned securities. As with any extensions of credit, there are risks of
delay in recovery and in some cases even loss of rights in the collateral should
the borrower of the securities fail financially. However, loans of portfolio
securities will only be made to firms deemed by the Investment Manager to be
creditworthy and when the income which can be earned from such loans justifies
the attendant risks.
 
    YEAR 2000.  The investment management services provided to the Fund by the
Investment Manager and the services provided to shareholders by the Distributor
and the Transfer Agent depend on the smooth functioning of their computer
systems. Many computer software systems in use today cannot recognize the year
2000, but revert to 1900 or some other date, due to the manner in which dates
were encoded and calculated. That failure could have a negative impact on the
handling of securities
 
                                       15
<PAGE>
trades, pricing and account services. The Investment Manager, the Distributor
and the Transfer Agent have been actively working on necessary changes to their
own computer systems to prepare for the year 2000 and expect that their systems
will be adapted before that date, but there can be no assurance that they will
be successful, or that interaction with other non-complying computer systems
will not impair their services at that time.
 
    In addition, it is possible that the markets for securities in which the
Fund invests may be detrimentally affected by computer failures throughout the
financial services industry beginning January 1, 2000. Improperly functioning
trading systems may result in settlement problems and liquidity issues. In
addition, corporate and governmental data processing errors may result in
production problems for individual companies and overall economic uncertainties.
Earnings of individual issuers will be affected by remediation costs, which may
be substantial and may be reported inconsistently in U.S. and foreign financial
statements. Accordingly, the Fund's investments may be adversely affected.
 
    For additional risk disclosure, please refer to the "Investment Objective
and Policies" section of the Prospectus and to the "Investment Practices and
Policies" section of the Statement of Additional Information.
 
    Except as specifically noted, all investment policies and practices
discussed above are not fundamental policies of the Fund and, as such, may be
changed without shareholder approval.
 
PORTFOLIO MANAGEMENT
 
    The Fund's portfolio is actively managed by its Investment Manager with a
view to achieving the Fund's investment objective. In determining which
securities to purchase for the Fund or hold in the Fund's portfolio, the
Investment Manager will rely on information from various sources, including
research, analysis and appraisals of brokers and dealers, including Morgan
Stanley & Co. Incorporated, Dean Witter Reynolds Inc. and other broker-dealer
affiliates of MSDW Advisors, and others regarding economic developments and
interest rate trends, and the Investment Manager's own analysis of factors it
deems relevant. The Fund's portfolio is managed within MSDW Advisors' Sector
Rotation Group, which manages 4 equity funds and fund portfolios with
approximately $7.2 billion in assets as of November 30, 1998. Anita H. Kolleeny,
Senior Vice President of MSDW Advisors' Sector Rotation Group, is the primary
portfolio manager of the Fund and co-management is provided by Michelle Kaufman,
Vice President of MSDW Advisors. Ms. Kolleeny has been a portfolio manager at
MSDW Advisors for over five years. Ms. Kaufman is a member of MSDW Advisors'
Sector Rotation Group and has been with MSDW Advisors for over five years.
 
    Orders for transactions in portfolio securities and commodities are placed
for the Fund with a number of brokers and dealers, including Dean Witter
Reynolds Inc., Morgan Stanley & Co. Incorporated and other brokers and dealers
that are affiliates of the Investment Manager, subject to the rules and
regulations governing dealings between the Fund and its affiliates. The Fund may
incur brokerage commissions on transactions conducted through such affiliates.
Pursuant to an order of the Securities and Exchange Commission, the Fund may
effect principal transactions in certain money market instruments with Dean
Witter Reynolds Inc. It is anticipated that, under normal circumstances, the
Fund's portfolio turnover rate will not exceed 400% in any one year, and
therefore the Fund's portfolio turnover rate may be higher than that of many
other investment companies. A high portfolio turnover rate will increase the
Fund's brokerage costs. Short term gains and losses may result from such
portfolio transactions. See "Dividends, Distributions and Taxes" for a
discussion of the tax implications of the Fund's trading policy. A more
extensive discussion of the Fund's portfolio brokerage policies is set forth in
the Statement of Additional Information.
 
                                       16
<PAGE>
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
    The investment restrictions listed below are among the restrictions which
have been adopted by the Fund as fundamental policies. Under the Investment
Company Act of 1940, as amended (the "Act"), a fundamental policy may not be
changed without the vote of a majority of the outstanding voting securities of
the Fund, as defined in the Act. For purposes of the following limitations: (i)
all percentage limitations apply immediately after a purchase or initial
investment, and (ii) any subsequent change in any applicable percentage
resulting from market fluctuations or other changes in total or net assets does
not require elimination of any security from the portfolio.
 
    The Fund may not:
 
    1. As to 75% of its total assets, invest more than 5% of the value of its
total assets in the securities of any one issuer (other than obligations issued,
or guaranteed by, the United States Government, its agencies or
instrumentalities), except that the Fund may invest all or substantially all of
its assets in another registered investment company having the same investment
objective and policies and substantially the same investment restrictions as the
Fund (a "Qualifying Portfolio").
 
    2. As to 75% of its total assets, purchase more than 10% of all outstanding
voting securities or any class of securities of any one issuer, except that the
Fund may invest all or substantially all of its assets in a Qualifying
Portfolio.
 
    3. Invest 25% or more of the value of its total assets in securities of
issuers in any one industry. This restriction does not apply to obligations
issued or guaranteed by the United States Government or its agencies or
instrumentalities.
 
UNDERWRITING
- --------------------------------------------------------------------------------
 
    Morgan Stanley Dean Witter Distributors Inc. (the "Underwriter") has agreed
to purchase up to 10,000,000 shares from the Fund, which number may be increased
or decreased in accordance with the Underwriting Agreement. The initial offering
will run approximately from January 25, 1999 through February 19, 1999. The
Underwriting Agreement provides that the obligation of the Underwriter is
subject to certain conditions precedent and that the Underwriter will be
obligated to purchase the shares on February 24, 1999, or such other date as may
be agreed upon by the Underwriter and the Fund (the "Closing Date"). Shares will
not be issued and dividends will not be declared by the Fund until after the
Closing Date. For this reason, payment is not required to be made prior to the
Closing Date. If any orders received during the initial offering period are
accompanied by payment, such payment will be returned unless an accompanying
request for investment in a Morgan Stanley Dean Witter money market fund is
received at the time the payment is made. Prospective investors in money market
funds should request and read the money market fund prospectus prior to
investing. All such funds received and invested in a Morgan Stanley Dean Witter
money market fund will be automatically invested in the Fund on the Closing Date
without any further action by the investor. Any investor may cancel his or her
purchase of Fund shares without penalty at any time prior to the Closing Date.
 
    The Underwriter will purchase Class B, Class C and Class D shares from the
Fund at $10.00 per share with all proceeds going to the Fund and will purchase
Class A shares at $10.00 per share plus a sales charge with the sales charge
paid to the Underwriter and the net asset value of $10.00 per share going to the
Fund. The Underwriter may, however, receive contingent deferred sales charges
from future redemptions of Class A, Class B and Class C shares (see "Purchase of
Fund Shares-- Continuous Offering").
 
                                       17
<PAGE>
    The Underwriter shall, regardless of its expected underwriting commitment,
be entitled and obligated to purchase only the number of shares for which
purchase orders have been received by the Underwriter prior to 2:00 p.m., New
York time, on the third business day preceding the Closing Date, or such other
date as may be agreed to between the parties.
 
    The minimum number of Fund shares which may be purchased by any shareholder
pursuant to this offering is 100 shares. Certificates for shares purchased will
not be issued unless requested by the shareholder in writing.
 
    The Fund intends to suspend the offering of its shares to new investors
whenever the Investment Manager determines that doing so is in the best interest
of prudent portfolio management. During any such suspension, the Fund will
continue to offer its shares to current shareholders. Currently, the Fund
anticipates suspending the offering of its shares to new investors if its net
assets reach a level of approximately $2 billion during the initial offering or
ensuing months of the continuous offering, unless the Investment Manager
determines that the continued offering of the Fund's shares is consistent at
that time with prudent portfolio management (see "Purchase of Fund
Shares--Continuous Offering").
 
PURCHASE OF FUND SHARES--CONTINUOUS OFFERING
- --------------------------------------------------------------------------------
 
GENERAL
 
    Within approximately two weeks after the Closing Date for the underwriting
the Fund will commence offering each class of its shares for sale to the public
on a continuous basis, unless the Fund suspends the offering of its shares to
new investors. Pursuant to a Distribution Agreement between the Fund and Morgan
Stanley Dean Witter Distributors Inc. (the "Distributor"), an affiliate of the
Investment Manager, shares of the Fund are distributed by the Distributor and
offered by Dean Witter Reynolds Inc. ("DWR"), a selected dealer and subsidiary
of Morgan Stanley Dean Witter & Co., and other dealers which have entered into
agreements with the Distributor ("Selected Broker-Dealers"). It is anticipated
that DWR will undergo a change of corporate name which is expected to
incorporate the brand name of "Morgan Stanley Dean Witter," pending approval of
various regulatory authorities. The principal executive office of the
Distributor is located at Two World Trade Center, New York, New York 10048.
 
    The Fund offers four classes of shares (each, a "Class"). Class A shares are
sold to investors with an initial sales charge that declines to zero for larger
purchases; however, Class A shares sold without an initial sales charge are
subject to a contingent deferred sales charge ("CDSC") of 1.0% if redeemed
within one year of purchase, except for certain specific circumstances. Class B
shares are sold without an initial sales charge but are subject to a CDSC
(scaled down from 5.0% to 1.0%) payable upon most redemptions within six years
after purchase. Class C shares are sold without an initial sales charge but are
subject to a CDSC of 1.0% on most redemptions made within one year after
purchase. Class D shares are sold without an initial sales charge or CDSC and
are available only to investors meeting an initial investment minimum of $5
million ($25 million for certain employee benefit plans), and to certain other
limited categories of investors. At the discretion of the Board of Trustees of
the Fund, Class A shares may be sold to categories of investors in addition to
those set forth in this prospectus at net asset value without a front-end sales
charge, and Class D shares may be sold to certain other categories of investors,
in each case as may be described in the then current prospectus of the Fund. See
"Alternative Purchase Arrangements--Selecting a Particular Class" for a
discussion of factors to consider in selecting which Class of shares to
purchase.
 
    The minimum initial purchase is $1,000 for each Class of shares, although
Class D shares are only
 
                                       18
<PAGE>
available to persons investing $5 million ($25 million for certain employee
benefit plans) or more and to certain other limited categories of investors. For
the purpose of meeting the minimum $5 million (or $25 million) initial
investment for Class D shares, and subject to the $1,000 minimum initial
investment for each Class of the Fund, an investor's existing holdings of Class
A and Class D shares of the Fund and other Morgan Stanley Dean Witter Funds that
are multiple class funds ("Morgan Stanley Dean Witter Multi-Class Funds") and
shares of Morgan Stanley Dean Witter Funds sold with a front-end sales charge
("FSC Funds") and concurrent investments in Class D shares of the Fund and other
Morgan Stanley Dean Witter Multi-Class Funds will be aggregated. Subsequent
purchases of $100 or more may be made by sending a check, payable to Morgan
Stanley Dean Witter Aggressive Equity Fund, directly to Morgan Stanley Dean
Witter Trust FSB (the "Transfer Agent" or "MSDW Trust") at P.O. Box 1040, Jersey
City, NJ 07303 or by contacting a Morgan Stanley Dean Witter Financial Advisor
or other Selected Broker-Dealer representative. When purchasing shares of the
Fund, investors must specify whether the purchase is for Class A, Class B, Class
C or Class D shares. If no Class is specified, the Transfer Agent will not
process the transaction until the proper Class is identified. The minimum
initial purchase, in the case of investments through EasyInvest-SM-, an
automatic purchase plan (see "Shareholder Services"), is $100, provided that the
schedule of automatic investments will result in investments totalling at least
$1,000 within the first twelve months. The minimum initial purchase in the case
of an "Education IRA" is $500, if the Distributor has reason to believe that
additional investments will increase the investment in the account to $1,000
within three years. In the case of investments pursuant to (i) Systematic
Payroll Deduction Plans (including Individual Retirement Plans), (ii) the
Investment Manager's mutual fund asset allocation program and (iii) fee-based
programs approved by the Distributor, pursuant to which participants pay an
asset based fee for services in the nature of investment advisory or
administrative services, the Fund, in its discretion, may accept investments
without regard to any minimum amounts which would otherwise be required,
provided, in the case of Systematic Payroll Deduction Plans, that the
Distributor has reason to believe that additional investments will increase the
investment in all accounts under such Plans to at least $1,000. Certificates for
shares purchased will not be issued unless a request is made by the shareholder
in writing to the Transfer Agent.
 
    Shares of the Fund are sold through the Distributor on a normal three
business day settlement basis; that is, payment is due on the third business day
(settlement date) after the order is placed with the Distributor. Since DWR and
other Selected Broker-Dealers forward investors' funds on settlement date, they
will benefit from the temporary use of the funds if payment is made prior
thereto. As noted above, orders placed directly with the Transfer Agent must be
accompanied by payment. Investors will be entitled to receive income dividends
and capital gains distributions if their order is received by the close of
business on the day prior to the record date for such distributions. Sales
personnel of a Selected Broker-Dealer are compensated for selling shares of the
Fund at the time of their sale by the Distributor or any of its affiliates
and/or the Selected Broker-Dealer. In addition, some sales personnel of the
Selected Broker-Dealer will receive various types of non-cash compensation as
special sales incentives, including trips, educational and/or business seminars
and merchandise. The Fund and the Distributor reserve the right to reject any
purchase orders.
 
    The Fund intends to suspend the offering of its shares to new investors
(during the initial or continuous offering) whenever the Investment Manager
determines that doing so is in the best interests of prudent portfolio
management. During any such suspension, current shareholders of the Fund will
continue to be able to purchase additional Fund shares. Currently, the Fund
anticipates suspending the offering of its shares to new investors if its net
 
                                       19
<PAGE>
assets reach a level of approximately $2 billion during the initial offering or
ensuing months of the continuous offering, unless the Investment Manager
determines that the continued offering of the Fund's shares is consistent at
that time with prudent portfolio management. Subsequently, the Fund will
recommence offering its shares to new investors from time to time as may be
consistent with prudent portfolio management. Automatic reinvestment of
dividends and distributions, and other existing shareholder services such as the
Systematic Withdrawal Plan, EasyInvest and the Exchange Privilege (see
"Shareholder Services"), will not be affected by any suspension by the Fund of
offering its shares.
 
ALTERNATIVE PURCHASE ARRANGEMENTS
 
    The Fund offers several Classes of shares to investors designed to provide
them with the flexibility of selecting an investment best suited to their needs.
The general public is offered three Classes of shares: Class A shares, Class B
shares and Class C shares, which differ principally in terms of sales charges
and rate of expenses to which they are subject. A fourth Class of shares, Class
D shares, is offered only to limited categories of investors (see "No Load
Alternative--Class D Shares" below).
 
    Each Class A, Class B, Class C or Class D share of the Fund represents an
identical interest in the Fund except that Class A, Class B and Class C shares
bear the expenses of the ongoing shareholder service fees, Class B and Class C
shares bear the expenses of the ongoing distribution fees and Class A, Class B
and Class C shares which are redeemed subject to a CDSC bear the expense of the
additional incremental distribution costs resulting from the CDSC applicable to
shares of those Classes. The ongoing distribution fees of the Fund that are
imposed on Class A, Class B and Class C shares will be imposed directly against
those Classes of the Fund and not against all assets of the Fund and,
accordingly, such charges against one Class will not affect the net asset value
of any other Class or have any impact on investors choosing another sales charge
option. See "Plan of Distribution" and "Redemptions and Repurchases."
 
    Set forth below is a summary of the differences between the Classes and the
factors an investor should consider when selecting a particular Class. This
summary is qualified in its entirety by detailed discussion of each Class that
follows this summary.
 
    CLASS A SHARES.  Class A shares are sold at net asset value plus an initial
sales charge of up to 5.25%. The initial sales charge is reduced for certain
purchases. Investments of $1 million or more (and investments by certain other
limited categories of investors) are not subject to any sales charges at the
time of purchase but are subject to a CDSC of 1.0% on redemptions made within
one year after purchase, except for certain specific circumstances. Class A
shares are also subject to a 12b-1 fee of up to 0.25% of the average daily net
assets of the Class. See "Initial Sales Charge Alternative--Class A Shares."
 
    CLASS B SHARES.  Class B shares are offered at net asset value with no
initial sales charge but are subject to a CDSC (scaled down from 5.0% to 1.0%)
if redeemed within six years of purchase. This CDSC may be waived for certain
redemptions. Class B shares are also subject to an annual 12b-1 fee of 1.0% of
the average daily net assets of Class B. The Class B shares' distribution fee
will cause that Class to have higher expenses and pay lower dividends than Class
A or Class D shares.
 
    After approximately ten (10) years, Class B shares will convert
automatically to Class A shares of the Fund, based on the relative net asset
values of the shares of the two Classes on the conversion date. In addition, a
certain portion of Class B shares that have been acquired through the
reinvestment of dividends and distributions will be converted at that time. See
"Contingent Deferred Sales Charge Alternative--Class B Shares."
 
    CLASS C SHARES.  Class C shares are sold at net asset value with no initial
sales charge but are subject to a CDSC of 1.0% on redemptions made within
 
                                       20
<PAGE>
one year after purchase. This CDSC may be waived for certain redemptions. They
are subject to an annual 12b-1 fee of up to 1.0% of the average daily net assets
of the Class C shares. The Class C shares' distribution fee may cause that Class
to have higher expenses and pay lower dividends than Class A or Class D shares.
See "Level Load Alternative--Class C Shares."
 
    CLASS D SHARES.  Class D shares are available only to limited categories of
investors (see "No Load Alternative--Class D Shares" below). Class D shares are
sold at net asset value with no initial sales charge or CDSC. They are not
subject to any 12b-1 fees. See "No Load Alternative--Class D Shares."
 
    SELECTING A PARTICULAR CLASS.  In deciding which Class of Fund shares to
purchase, investors should consider the following factors, as well as any other
relevant facts and circumstances:
 
    The decision as to which Class of shares is more beneficial to an investor
depends on the amount and intended length of his or her investment. Investors
who prefer an initial sales charge alternative may elect to purchase Class A
shares. Investors qualifying for significantly reduced or, in the case of
purchases of $1 million or more, no initial sales charges may find Class A
shares particularly attractive because similar sales charge reductions are not
available with respect to Class B or Class C shares. Moreover, Class A shares
are subject to lower ongoing expenses than are Class B or Class C shares over
the term of the investment. As an alternative, Class B and Class C shares are
sold without any initial sales charge so the entire purchase price is
immediately invested in the Fund. Any investment return on these additional
investment amounts may partially or wholly offset the higher annual expenses of
these Classes. Because the Fund's future return cannot be predicted, however,
there can be no assurance that this would be the case.
 
    Finally, investors should consider the effect of the CDSC period and any
conversion rights of the Classes in the context of their own investment time
frame. For example, although Class C shares are subject to a significantly lower
CDSC upon redemptions, they do not, unlike Class B shares, convert into Class A
shares after approximately ten years, and, therefore, are subject to an ongoing
12b-1 fee of 1.0% (rather than the 0.25% fee applicable to Class A shares) for
an indefinite period of time. Thus, Class B shares may be more attractive than
Class C shares to investors with longer term investment outlooks. Other
investors, however, may elect to purchase Class C shares if, for example, they
determine that they do not wish to be subject to a front-end sales charge and
they are uncertain as to the length of time they intend to hold their shares.
 
    For the purpose of meeting the $5 million (or $25 million) minimum
investment amount for Class D shares, holdings of Class A and Class D shares in
all Morgan Stanley Dean Witter Multi-Class Funds, shares of FSC Funds and shares
of Morgan Stanley Dean Witter Funds for which such shares have been exchanged,
will be included together with the current investment amount.
 
    Sales personnel may receive different compensation for selling each Class of
shares. Investors should understand that the purpose of a CDSC is the same as
that of the initial sales charge in that the sales charges applicable to each
Class provide for the financing of the distribution of shares of that Class.
 
                                       21
<PAGE>
    Set forth below is a chart comparing the sales charge, 12b-1 fees and
conversion options applicable to each Class of shares:
 
<TABLE>
<CAPTION>
- -----------------------------------------------------------
                                              CONVERSION
  CLASS       SALES CHARGE     12b-1 FEE       FEATURE
<C>        <S>                 <C>         <C>
- -----------------------------------------------------------
    A      Maximum 5.25%         0.25%            No
           initial sales
           charge reduced for
           purchases of
           $25,000 and over;
           shares sold
           without an initial
           sales charge
           generally subject
           to a 1.0% CDSC
           during first year.
- -----------------------------------------------------------
    B      Maximum 5.0% CDSC      1.0%     B shares convert
           during the first                to A shares
           year decreasing to              automatically
           0 after six years               after
                                           approximately
                                           ten years
- -----------------------------------------------------------
    C      1.0% CDSC during       1.0%            No
           first year
- -----------------------------------------------------------
    D             None            None            No
</TABLE>
 
    See "Purchase of Fund Shares" and "The Fund and its Management" for a
complete description of the sales charges and service and distribution fees for
each Class of shares and "Determination of Net Asset Value," "Dividends,
Distributions and Taxes" and "Shareholder Services--Exchange Privilege" for
other differences between the Classes of shares.
 
INITIAL SALES CHARGE ALTERNATIVE--
CLASS A SHARES
 
    Class A shares are sold at net asset value plus an initial sales charge. In
some cases, reduced sales charges may be available, as described below.
Investments of $1 million or more (and investments by certain other limited
categories of investors) are not subject to any sales charges at the time of
purchase but are subject to a CDSC of 1.0% on redemptions made within one year
after purchase (calculated from the last day of the month in which the shares
were purchased), except for certain specific circumstances. The CDSC will be
assessed on an amount equal to the lesser of the current market value or the
cost of the shares being redeemed. The CDSC will not be imposed (i) in the
circumstances set forth below in the section "Contingent Deferred Sales Charge
Alternative--Class B Shares--CDSC Waivers," except that the references to six
years in the first paragraph of that section shall mean one year in the case of
Class A shares, and (ii) in the circumstances identified in the section
"Additional Net Asset Value Purchase Options" below. Class A shares are also
subject to an annual 12b-1 fee of up to 0.25% of the average daily net assets of
the Class.
 
    The offering price of Class A shares will be the net asset value per share
next determined following receipt of an order (see "Determination of Net Asset
Value" below), plus a sales charge (expressed as a percentage of the offering
price) on a single transaction as shown in the following table:
 
<TABLE>
<CAPTION>
                                          SALES CHARGE
                           ------------------------------------------
                              PERCENTAGE OF          APPROXIMATE
        AMOUNT OF            PUBLIC OFFERING    PERCENTAGE OF AMOUNT
   SINGLE TRANSACTION             PRICE               INVESTED
- -------------------------  -------------------  ---------------------
<S>                        <C>                  <C>
Less than $25,000........           5.25%                 5.54%
$25,000 but less
     than $50,000........           4.75%                 4.99%
$50,000 but less
     than $100,000.......           4.00%                 4.17%
$100,000 but less
     than $250,000.......           3.00%                 3.09%
$250,000 but less
     than $1 million.....           2.00%                 2.04%
$1 million and over......              0                     0
</TABLE>
 
    Upon notice to all Selected Broker-Dealers, the Distributor may reallow up
to the full applicable sales charge as shown in the above schedule during
periods specified in such notice. During periods when 90% or more of the sales
charge is reallowed, such Selected Broker-Dealers may be deemed to be
underwriters as that term is defined in the Securities Act of 1933.
 
    The above schedule of sales charges is applicable to purchases in a single
transaction by, among others: (a) an individual; (b) an individual,
 
                                       22
<PAGE>
his or her spouse and their children under the age of 21 purchasing shares for
his, her or their own accounts; (c) a trustee or other fiduciary purchasing
shares for a single trust estate or a single fiduciary account; (d) a pension,
profit-sharing or other employee benefit plan qualified or non-qualified under
Section 401 of the Internal Revenue Code; (e) tax-exempt organizations
enumerated in Section 501(c)(3) or (13) of the Internal Revenue Code; (f)
employee benefit plans qualified under Section 401 of the Internal Revenue Code
of a single employer or of employers who are "affiliated persons" of each other
within the meaning of Section 2(a)(3)(c) of the Act; and for investments in
Individual Retirement Accounts of employees of a single employer through
Systematic Payroll Deduction plans; or (g) any other organized group of persons,
whether incorporated or not, provided the organization has been in existence for
at least six months and has some purpose other than the purchase of redeemable
securities of a registered investment company at a discount.
 
    COMBINED PURCHASE PRIVILEGE.  Investors may have the benefit of reduced
sales charges in accordance with the above schedule by combining purchases of
Class A shares of the Fund in single transactions with the purchase of Class A
shares of other Morgan Stanley Dean Witter Multi-Class Funds and shares of FSC
Funds. The sales charge payable on the purchase of the Class A shares of the
Fund, the Class A shares of the other Morgan Stanley Dean Witter Multi-Class
Funds and the shares of the FSC Funds will be at their respective rates
applicable to the total amount of the combined concurrent purchases of such
shares.
 
    RIGHT OF ACCUMULATION.  The above persons and entities may benefit from a
reduction of the sales charges in accordance with the above schedule if the
cumulative net asset value of Class A shares purchased in a single transaction,
together with shares of the Fund and other Morgan Stanley Dean Witter Funds
previously purchased at a price including a front-end sales charge (including
shares of the Fund and other Morgan Stanley Dean Witter Funds acquired in
exchange for those shares, and including in each case shares acquired through
reinvestment of dividends and distributions), which are held at the time of such
transaction, amounts to $25,000 or more. If such investor has a cumulative net
asset value of shares of FSC Funds and Class A and Class D shares, that,
together with the current investment amount, is equal to at least $5 million
($25 million for certain employee benefit plans), such investor is eligible to
purchase Class D shares subject to the $1,000 minimum initial investment
requirement of that Class of the Fund. See "No Load Alternative--Class D Shares"
below.
 
    The Distributor must be notified by DWR or a Selected Broker-Dealer or the
shareholder at the time a purchase order is placed that the purchase qualifies
for the reduced charge under the Right of Accumulation. Similar notification
must be made in writing by the dealer or shareholder when such an order is
placed by mail. The reduced sales charge will not be granted if: (a) such
notification is not furnished at the time of the order; or (b) a review of the
records of the Selected Broker-Dealer or the Transfer Agent fails to confirm the
investor's represented holdings.
 
    LETTER OF INTENT.  The foregoing schedule of reduced sales charges will also
be available to investors who enter into a written Letter of Intent providing
for the purchase, within a thirteen-month period, of Class A shares of the Fund
and/or other Morgan Stanley Dean Witter Funds and/or shares of FSC Funds from
DWR or other Selected Broker-Dealers. The cost of Class A shares of the Fund or
shares of other Morgan Stanley Dean Witter Funds which were previously purchased
at a price including a front-end sales charge during the 90-day period prior to
the date of receipt by the Distributor of the Letter of Intent, or of Class A
shares of the Fund or shares of other Morgan Stanley Dean Witter Funds acquired
in exchange for shares of such funds purchased during such period at a price
including a front-end sales charge, which are still owned by the shareholder,
may also be included in determining the applicable reduction.
 
                                       23
<PAGE>
    ADDITIONAL NET ASSET VALUE PURCHASE OPTIONS. In addition to investments of
$1 million or more, Class A shares also may be purchased at net asset value by
the following:
 
    (1) trusts for which MSDW Trust (which is an affiliate of the Investment
Manager) provides discretionary trustee services;
 
    (2) persons participating in a fee-based program approved by the
Distributor, pursuant to which such persons pay an asset based fee for services
in the nature of investment advisory, administrative and/or brokerage services
(such investments are subject to all of the terms and conditions of such
programs, which may include termination fees, mandatory redemption upon
termination and such other circumstances as specified in the programs'
agreements, and restrictions on transferability of Fund shares);
 
    (3) employer-sponsored employee benefit plans, whether or not qualified
under the Internal Revenue Code, for which MSDW Trust serves as Trustee or DWR's
Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement ("MSDW Eligible Plans") which have at least 200
eligible employees;
 
    (4) MSDW Eligible Plans whose Class B shares have converted to Class A
shares, regardless of the plan's asset size or number of eligible employees;
 
    (5) investors who are clients of a Morgan Stanley Dean Witter Financial
Advisor who joined Morgan Stanley Dean Witter from another investment firm
within six months prior to the date of purchase of Fund shares by such
investors, if the shares are being purchased with the proceeds from a redemption
of shares of an open-end proprietary mutual fund of the Financial Advisor's
previous firm which imposed either a front-end or deferred sales charge,
provided such purchase was made within sixty days after the redemption and the
proceeds of the redemption had been maintained in the interim in cash or a money
market fund; and
 
    (6) other categories of investors, at the discretion of the Board, as
disclosed in the then current prospectus of the Fund.
 
    No CDSC will be imposed on redemptions of shares purchased pursuant to the
above.
 
    For further information concerning purchases of the Fund's shares, contact
DWR or another Selected Broker-Dealer or consult the Statement of Additional
Information.
 
CONTINGENT DEFERRED SALES CHARGE
ALTERNATIVE--CLASS B SHARES
 
    Class B shares are sold at net asset value next determined without an
initial sales charge so that the full amount of an investor's purchase payment
may be immediately invested in the Fund. A CDSC, however, will be imposed on
most Class B shares redeemed within six years after purchase. The CDSC will be
imposed on any redemption of shares if after such redemption the aggregate
current value of a Class B account with the Fund falls below the aggregate
amount of the investor's purchase payments for Class B shares made during the
six years preceding the redemption. In addition, Class B shares are subject to
an annual 12b-1 fee of 1.0% of the average daily net assets of Class B.
 
    Class B shares of the Fund which are held for six years or more after
purchase (calculated from the last day of the month in which the shares were
purchased) will not be subject to any CDSC upon redemption. Shares redeemed
earlier than six years after purchase may, however, be subject to a CDSC which
will be a percentage of the dollar amount of shares redeemed and will be
assessed on an amount equal to the lesser of the current market value or the
cost of the shares being redeemed. The size of this percentage will depend upon
how long
 
                                       24
<PAGE>
the shares have been held, as set forth in the following table:
 
<TABLE>
<CAPTION>
                                              CDSC AS A
         YEAR SINCE PURCHASE                PERCENTAGE OF
             PAYMENT MADE                  AMOUNT REDEEMED
- --------------------------------------  ---------------------
<S>                                     <C>
First.................................          5.0%
Second................................          4.0%
Third.................................          3.0%
Fourth................................          2.0%
Fifth.................................          2.0%
Sixth.................................          1.0%
Seventh and thereafter................          None
</TABLE>
 
    CDSC WAIVERS.  A CDSC will not be imposed on: (i) any amount which
represents an increase in value of shares purchased within the six years
preceding the redemption; (ii) the current net asset value of shares purchased
more than six years prior to the redemption; and (iii) the current net asset
value of shares purchased through reinvestment of dividends or distributions
and/or shares acquired in exchange for shares of other open-end investment
companies for which MSDW Advisors serves as investment manager (collectively,
with the Fund, the "Morgan Stanley Dean Witter Funds") sold with a front-end
sales charge or of other Morgan Stanley Dean Witter Funds acquired in exchange
for such shares. Moreover, in determining whether a CDSC is applicable it will
be assumed that amounts described in (i), (ii) and (iii) above (in that order)
are redeemed first. In addition, no CDSC will be imposed on redemptions of
shares purchased by MSDW Eligible Plans.
 
    In addition, the CDSC, if otherwise applicable, will be waived in the case
of:
 
    (1) redemptions of shares held at the time a shareholder dies or becomes
disabled, only if the shares are:  (a) registered either in the name of an
individual shareholder (not a trust), or in the names of such shareholder and
his or her spouse as joint tenants with right of survivorship; or  (b) held in a
qualified corporate or self-employed retirement plan, Individual Retirement
Account ("IRA") or Custodial Account under Section 403(b)(7) of the Internal
Revenue Code ("403(b) Custodial Account"), provided in either case that the
redemption is requested within one year of the death or initial determination of
disability;
 
    (2) redemptions in connection with the following retirement plan
distributions:  (a) lump-sum or other distributions from a qualified corporate
or self-employed retirement plan following retirement (or, in the case of a "key
employee" of a "top heavy" plan, following attainment of age 59 1/2); (b)
distributions from an IRA or 403(b) Custodial Account following attainment of
age 59 1/2; or  (c) a tax-free return of an excess contribution to an IRA; and
 
    (3) certain redemptions pursuant to the Fund's Systematic Withdrawal Plan
(see "Shareholder Services--Systematic Withdrawal Plan").
 
    With reference to (1) above, for the purpose of determining disability, the
Distributor utilizes the definition of disability contained in Section 72(m)(7)
of the Internal Revenue Code, which relates to the inability to engage in
gainful employment. With reference to (2) above, the term "distribution" does
not encompass a direct transfer of IRA, 403(b) Custodial Account or retirement
plan assets to a successor custodian or trustee. All waivers will be granted
only following receipt by the Distributor of confirmation of the shareholder's
entitlement.
 
    CONVERSION TO CLASS A SHARES.  Class B shares of the Fund will convert
automatically to Class A shares, based on the relative net asset values of the
shares of the two Classes on the conversion date, which will be approximately
ten (10) years after the date of the original purchase. The ten year period is
calculated from the last day of the month in which the shares were purchased or,
in the case of Class B shares acquired through an exchange or a series of
exchanges, from the last day of the month in which the original Class B shares
were purchased, provided that shares acquired in exchange for shares of another
fund originally purchased before May 1,
 
                                       25
<PAGE>
1997 will convert to Class A shares in May, 2007. The conversion of shares
purchased on or after May 1, 1997 will take place in the month following the
tenth anniversary of the purchase. There will also be converted at that time
such proportion of Class B shares acquired through automatic reinvestment of
dividends and distributions owned by the shareholder as the total number of his
or her Class B shares converting at the time bears to the total number of
outstanding Class B shares purchased and owned by the shareholder. In the case
of Class B shares held by a MSDW Eligible Plan, the plan is treated as a single
investor and all Class B shares will convert to Class A shares on the conversion
date of the first shares of a Morgan Stanley Dean Witter Multi-Class Fund
purchased by that plan. In the case of Class B shares previously exchanged for
shares of an "Exchange Fund" (see "Shareholder Services--Exchange Privilege"),
the period of time the shares were held in the Exchange Fund (calculated from
the last day of the month in which the Exchange Fund shares were acquired) is
excluded from the holding period for conversion. If those shares are
subsequently re-exchanged for Class B shares of a Morgan Stanley Dean Witter
Multi-Class Fund, the holding period resumes on the last day of the month in
which Class B shares are reacquired.
 
    If a shareholder has received share certificates for Class B shares, such
certificates must be delivered to the Transfer Agent at least one week prior to
the date for conversion. Class B shares evidenced by share certificates that are
not received by the Transfer Agent at least one week prior to any conversion
date will be converted into Class A shares on the next scheduled conversion date
after such certificates are received.
 
    Effectiveness of the conversion feature is subject to the continuing
availability of a ruling of the Internal Revenue Service or an opinion of
counsel that (i) the conversion of shares does not constitute a taxable event
under the Internal Revenue Code, (ii) Class A shares received on conversion will
have a basis equal to the shareholder's basis in the converted Class B shares
immediately prior to the conversion, and (iii) Class A shares received on
conversion will have a holding period that includes the holding period of the
converted Class B shares. The conversion feature may be suspended if the ruling
or opinion is no longer available. In such event, Class B shares would continue
to be subject to Class B 12b-1 fees.
 
LEVEL LOAD ALTERNATIVE--CLASS C SHARES
 
    Class C shares are sold at net asset value next determined without an
initial sales charge but are subject to a CDSC of 1.0% on most redemptions made
within one year after purchase (calculated from the last day of the month in
which the shares were purchased). The CDSC will be assessed on an amount equal
to the lesser of the current market value or the cost of the shares being
redeemed. The CDSC will not be imposed in the circumstances set forth above in
the section "Contingent Deferred Sales Charge Alternative--Class B Shares--CDSC
Waivers," except that the references to six years in the first paragraph of that
section shall mean one year in the case of Class C shares. Class C shares are
subject to an annual 12b-1 fee of up to 1.0% of the average daily net assets of
the Class. Unlike Class B shares, Class C shares have no conversion feature and,
accordingly, an investor that purchases Class C shares will be subject to 12b-1
fees applicable to Class C shares for an indefinite period subject to annual
approval by the Fund's Board of Trustees and regulatory limitations.
 
NO LOAD ALTERNATIVE--CLASS D SHARES
 
    Class D shares are offered without any sales charge on purchase or
redemption and without any 12b-1 fee. Class D shares are offered only to
investors meeting an initial investment minimum of $5 million ($25 million for
MSDW Eligible Plans) and the following categories of investors: (i) investors
participating in the Investment Manager's mutual fund asset allocation program
pursuant to which such persons pay an asset based fee; (ii) persons
participating in a fee-based program approved by the Distributor, pursuant to
which such persons pay
 
                                       26
<PAGE>
an asset based fee for services in the nature of investment advisory,
administrative and/or brokerage services (subject to all of the terms and
conditions of such programs referred to in (i) and (ii) above, which may include
termination fees, mandatory redemption upon termination and such other
circumstances as specified in the programs' agreements, and restrictions on
transferability of Fund shares); (iii) employee benefit plans maintained by
Morgan Stanley Dean Witter & Co. or any of its subsidiaries for the benefit of
certain employees of Morgan Stanley Dean Witter & Co. and its subsidiaries; (iv)
certain Unit Investment Trusts sponsored by DWR; (v) certain other open-end
investment companies whose shares are distributed by the Distributor; (vi)
investors who were shareholders of Dean Witter Retirement Series on September
11, 1998 (with respect to additional purchases for their former Dean Witter
Retirement Series accounts) and (vii) other categories of investors, at the
discretion of the Board, as disclosed in the then current prospectus of the
Fund. Investors who require a $5 million (or $25 million) minimum initial
investment to qualify to purchase Class D shares may satisfy that requirement by
investing that amount in a single transaction in Class D shares of the Fund and
other Morgan Stanley Dean Witter Multi-Class Funds, subject to the $1,000
minimum initial investment required for that Class of the Fund. In addition, for
the purpose of meeting the $5 million (or $25 million) minimum investment
amount, holdings of Class A and Class D shares in all Morgan Stanley Dean Witter
Multi-Class Funds, shares of FSC Funds and shares of Morgan Stanley Dean Witter
Funds for which such shares have been exchanged will be included together with
the current investment amount. If a shareholder redeems Class A shares and
purchases Class D shares, such redemption may be a taxable event.
 
PLAN OF DISTRIBUTION
 
    The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the
Act with respect to the distribution of Class A, Class B and Class C shares of
the Fund. In the case of Class A and Class C shares, the Plan provides that the
Fund will reimburse the Distributor and others for the expenses of certain
activities and services incurred by them specifically on behalf of those shares.
Reimbursements for these expenses will be made in monthly payments by the Fund
to the Distributor, which will in no event exceed amounts equal to payments at
the annual rates of 0.25% and 1.0% of the average daily net assets of Class A
and Class C, respectively. In the case of Class B shares, the Plan provides that
the Fund, on behalf of the Fund, will pay the Distributor a fee, which is
accrued daily and paid monthly, at the annual rate of 1.0% of the average daily
net assets of Class B. The fee is treated by the Fund as an expense in the year
it is accrued. In the case of Class A shares, the entire amount of the fee
currently represents a service fee within the meaning of the NASD guidelines. In
the case of Class B and Class C shares, a portion of the fee payable pursuant to
the Plan, equal to 0.25% of the average daily net assets of each of these
Classes, is currently characterized as a service fee. A service fee is a payment
made for personal service and/or the maintenance of shareholder accounts.
 
    Additional amounts paid under the Plan in the case of Class B and Class C
shares are paid to the Distributor for services provided and the expenses borne
by the Distributor and others in the distribution of the shares of those
Classes, including the payment of commissions for sales of the shares of those
Classes and incentive compensation to and expenses of Morgan Stanley Dean Witter
Financial Advisors and others who engage in or support distribution of shares or
who service shareholder accounts, including overhead and telephone expenses;
printing and distribution of prospectuses and reports used in connection with
the offering of the Fund's shares to other than current shareholders; and
preparation, printing and distribution of sales literature and advertising
materials. In addition, the Distributor may utilize fees paid pursuant to the
Plan in the case of Class B shares to compensate DWR and other Selected
Broker-Dealers for their opportunity costs in advancing such amounts,
 
                                       27
<PAGE>
which compensation would be in the form of a carrying charge on any unreimbursed
expenses.
 
    In the case of Class B shares, at any given time, the expenses in
distributing Class B shares of the Fund may be in excess of the total of (i) the
payments made by the Fund pursuant to the Plan, and (ii) the proceeds of CDSCs
paid by investors upon the redemption of Class B shares of the Fund. For
example, if $1 million in expenses in distributing Class B shares of the Fund
had been incurred and $750,000 had been received as described in (i) and (ii)
above, the excess expense would amount to $250,000. Because there is no
requirement under the Plan the Distributor be reimbursed for all distribution
expenses or any requirement that the Plan be continued from year to year, such
excess amount does not constitute a liability of the Fund. Although there is no
legal obligation for the Fund to pay expenses incurred in excess of payments
made to the Distributor under the Plan, and the proceeds of CDSCs paid by
investors upon redemption of shares, if for any reason the Plan is terminated
the Trustees will consider at that time the manner in which to treat such
expenses. Any cumulative expenses incurred, but not yet recovered through
distribution fees or CDSCs, may or may not be recovered through future
distribution fees or CDSCs.
 
    In the case of Class A and Class C shares of the Fund, expenses incurred
pursuant to the Plan in any calendar year in excess of 0.25% or 1.0% of the
average daily net assets of Class A or Class C, respectively, will not be
reimbursed by the Fund through payments in any subsequent year, except that
expenses representing a gross sales commission credited to Morgan Stanley Dean
Witter Financial Advisors and other Selected Broker-Dealer representatives at
the time of sale may be reimbursed in the subsequent calendar year. No interest
or other financing charges will be incurred on any Class A or Class C
distribution expenses incurred by the Distributor under the Plan or on any
unreimbursed expenses due to the Distributor pursuant to the Plan.
 
DETERMINATION OF NET ASSET VALUE
 
    The net asset value per share of the Fund is determined once daily at 4:00
p.m., New York time, on each day that the New York Stock Exchange is open (or,
on days when the New York Stock Exchange closes prior to 4:00 p.m., at such
earlier time) by taking the net assets of the Fund, dividing by the respective
number of shares outstanding and adjusting to the nearest cent. The assets of
the Fund, belonging to the Class A, Class B, Class C and Class D shares will be
invested together in a single portfolio. The net asset value of each Class of
the Fund, however, will be determined separately by subtracting each Class's
accrued expenses and liabilities. The net asset value per share will not be
determined on Good Friday and on such other federal and non-federal holidays as
are observed by the New York Stock Exchange.
 
    In the calculation of the Fund's net asset value; (1) an equity portfolio
security listed or traded on the New York or American Stock Exchange or other
stock exchange is valued at its latest sale price on that exchange prior to the
time assets are valued; if there were no sales that day, the security is valued
at the latest bid price (in cases where a security is traded on more than one
exchange, the security is valued on the exchange designated as the primary
market pursuant to procedures adopted by the Trustees); (2) all other portfolio
securities for which over-the-counter market quotations are readily available
are valued at the latest bid price; (3) when market quotations are not readily
available, including circumstances under which it is determined by the
Investment Manager that sale or bid prices are not reflective of a security's
market value, portfolio securities are valued at their fair value as determined
in good faith under procedures established by and under the general supervision
of the Fund's Trustees (valuation of debt securities for which market quotations
are not readily available may be based upon current market prices of securities
which are comparable in coupon, rating and maturity or an appropriate matrix
utilizing similar factors); (4) the value of short-term debt securities which
 
                                       28
<PAGE>
mature at a date less than sixty days subsequent to valuation date will be
determined on an amortized cost or amortized value basis; and (5) the value of
other assets will be determined in good faith at fair value under procedures
established by and under the general supervision of the Fund's Trustees.
Dividends receivable are accrued as of the ex-dividend date. Interest income is
accrued daily. Certain securities in the Fund's portfolio may be valued by an
outside pricing service approved by the Fund's Trustees.
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
    AUTOMATIC INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS.  All income dividends
and capital gains distributions are automatically paid in full and fractional
shares of the applicable Class of the Fund (or, if specified by the shareholder
in shares of any other open-end "Morgan Stanley Dean Witter Fund"), unless the
shareholder requests that they be paid in cash. Shares so acquired are acquired
at net asset value and are not subject to the imposition of a front-end sales
charge or a CDSC (see "Redemptions and Repurchases").
 
    INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS RECEIVED IN CASH.  Any shareholder
who receives a cash payment representing a dividend or capital gains
distribution may invest such dividend or distribution in shares of the
applicable Class at the net asset value per share next determined after receipt
by the Transfer Agent, by returning the check or the proceeds to the Transfer
Agent within thirty days after the payment date. Shares so acquired are acquired
at net asset value are not subject to the imposition of a front-end sales charge
or a CDSC (see "Redemptions and Repurchases").
 
    EASYINVEST-SM-.  Shareholders may subscribe to EasyInvest, an automatic
purchase plan which provides for any amount from $100 to $5,000 to be
transferred automatically from a checking or savings account or following
redemption of shares of a Morgan Stanley Dean Witter money market fund, on a
semi-monthly, monthly or quarterly basis, to the Transfer Agent for investment
in shares of the Fund. (See "Purchase of Fund Shares" and "Redemptions and
Repurchases--Involuntary Redemption").
 
    SYSTEMATIC WITHDRAWAL PLAN.  A systematic withdrawal plan (the "Withdrawal
Plan") is available for shareholders whose shares of Morgan Stanley Dean Witter
Funds have an aggregate value of $10,000 or more. Shares of any Fund from which
redemptions will be made pursuant to the Plan must have a value of $1,000 or
more (referred to as a "SWP Fund"). The required share values are determined on
the date the shareholder establishes the Withdrawal Plan. The Withdrawal Plan
provides for monthly, quarterly, semi-annual or annual payments in any amount
not less than $25, or in any whole percentage of the value of the SWP Funds'
shares, on an annualized basis. Any applicable CDSC will be imposed on shares
redeemed under the Withdrawal Plan (see "Purchase of Fund Shares"), except that
the CDSC, if any, will be waived on redemptions under the Withdrawal Plan of up
to 12% annually of the value of each SWP Fund account, based on the share values
next determined after the shareholder establishes the Withdrawal Plan.
Redemptions for which this CDSC waiver policy applies may be in amounts up to 1%
per month, 3% per quarter, 6% semi-annually or 12% annually. Under this CDSC
waiver policy, amounts withdrawn each period will be paid by first redeeming
shares not subject to a CDSC because the shares were purchased by the
reinvestment of dividends or capital gains distributions, the CDSC period has
elapsed or some other waiver of the CDSC applies. If shares subject to a CDSC
must be redeemed, shares held for the longest period of time will be redeemed
first and continuing with shares held the next longest period of time until
shares held the shortest period of time are redeemed. Any shareholder
participating in the
 
                                       29
<PAGE>
Withdrawal Plan will have sufficient shares redeemed from his or her account so
that the proceeds (net of any applicable CDSC) to the shareholder will be the
designated monthly, quarterly, semi-annual or annual amount.
 
    A shareholder may suspend or terminate participation in the Withdrawal Plan
at any time. A shareholder who has suspended participation may resume payments
under the Withdrawal Plan, without requiring a new determination of the account
value for the 12% CDSC waiver. The Withdrawal Plan may be terminated or revised
at any time by the Fund.
 
    Prior to adding an additional SWP Fund to an existing Withdrawal Plan, the
required $10,000/$1,000 share values must be met, to be calculated on the date
the shareholder adds the additional SWP Fund. However, the addition of a new SWP
Fund will not change the account value for the 12% CDSC waiver for the SWP Funds
already participating in the Withdrawal Plan.
 
    Withdrawal Plan payments should not be considered dividends, yields or
income. If periodic Withdrawal Plan payments continuously exceed net investment
income and net capital gains, the shareholder's original investment will be
correspondingly reduced and ultimately exhausted. Each withdrawal constitutes a
redemption of shares and any gain or loss realized must be recognized for
federal income tax purposes.
 
    Shareholders should contact their Morgan Stanley Dean Witter Financial
Advisor or other Selected Broker-Dealer representative or the Transfer Agent for
further information about any of the above services.
 
    TAX-SHELTERED RETIREMENT PLANS.  Retirement plans are available for use by
corporations, the self-employed, Individual Retirement Accounts and Custodial
Accounts under Section 403(b)(7) of the Internal Revenue Code. Adoption of such
plans should be on advice of legal counsel or tax advisor.
 
    For further information regarding plan administration, custodial fees and
other details, investors should contact their Morgan Stanley Dean Witter
Financial Advisor or other Selected Broker-Dealer representative or the Transfer
Agent.
 
EXCHANGE PRIVILEGE
 
    Shares of each Class may be exchanged for shares of the same Class of any
other Morgan Stanley Dean Witter Multi-Class Fund without the imposition of any
exchange fee. Shares may also be exchanged for shares of the following funds:
Morgan Stanley Dean Witter Short-Term U.S. Treasury Trust, Morgan Stanley Dean
Witter Limited Term Municipal Trust, Morgan Stanley Dean Witter Short-Term Bond
Fund and five Morgan Stanley Dean Witter funds which are money market funds (the
"Exchange Funds"). Class A shares may also be exchanged for shares of Morgan
Stanley Dean Witter Multi-State Municipal Series Trust and Morgan Stanley Dean
Witter Hawaii Municipal Trust, which are Morgan Stanley Dean Witter Funds sold
with a front-end sales charge ("FSC Funds"). Exchanges may be made after the
shares of the Fund acquired by purchase (not by exchange or dividend
reinvestment) have been held for thirty days. There is no waiting period for
exchanges of shares acquired by exchange or dividend reinvestment.
 
    An exchange to another Morgan Stanley Dean Witter Multi-Class Fund, any FSC
Fund or any Exchange Fund that is not a money market fund is on the basis of the
next calculated net asset value per share of each fund after the exchange order
is received. When exchanging into a money market fund from the Fund, shares of
the Fund are redeemed out of the Fund at their next calculated net asset value
and the proceeds of the redemption are used to purchase shares of the money
market fund at the net asset value determined the following business day.
Subsequent exchanges between any of the Morgan Stanley Dean Witter Multi-Class
Funds, FSC Funds or any Exchange Fund that is not a money market fund can be
effected on the same basis.
 
                                       30
<PAGE>
    No CDSC is imposed at the time of any exchange of shares, although any
applicable CDSC will be imposed upon ultimate redemption. During the period of
time the shareholder remains in an Exchange Fund (calculated from the last day
of the month in which the Exchange Fund shares were acquired), the holding
period (for the purpose of determining the rate of the CDSC) is frozen. If those
shares are subsequently re-exchanged for shares of a Morgan Stanley Dean Witter
Multi-Class Fund, the holding period previously frozen when the first exchange
was made resumes on the last day of the month in which shares of a Morgan
Stanley Dean Witter Multi-Class Fund are reacquired. Thus, the CDSC is based
upon the time (calculated as described above) the shareholder was invested in
shares of a Morgan Stanley Dean Witter Multi-Class Fund (see "Purchase of Fund
Shares"). In the case of exchanges of Class A shares which are subject to a
CDSC, the holding period also includes the time (calculated as described above)
the shareholder was invested in shares of a FSC Fund. In the case of shares
exchanged into an Exchange Fund on or after April 23, 1990, upon a redemption of
shares which results in a CDSC being imposed, a credit (not to exceed the amount
of the CDSC) will be given in an amount equal to the Exchange Fund 12b-1
distribution fees incurred on or after that date which are attributable to those
shares. (Exchange Fund 12b-1 distribution fees are described in the prospectuses
for those funds.) Class B shares of the Fund acquired in exchange for Class B
shares of another Morgan Stanley Dean Witter Multi-Class Fund having a different
CDSC schedule than that of this Fund will be subject to the higher CDSC
schedule, even if such shares are subsequently re-exchanged for shares of the
fund with the lower CDSC schedule.
 
    ADDITIONAL INFORMATION REGARDING EXCHANGES. Purchases and exchanges should
be made for investment purposes only. A pattern of frequent exchanges may be
deemed by the Investment Manager to be abusive and contrary to the best
interests of the Fund's other shareholders and, at the Investment Manager's
discretion, may be limited by the Fund's refusal to accept additional purchases
and/or exchanges from the investor. Although the Fund does not have any specific
definition of what constitutes a pattern of frequent exchanges, and will
consider all relevant factors in determining whether a particular situation is
abusive and contrary to the best interests of the Fund and its other
shareholders, investors should be aware that the Fund and each of the other
Morgan Stanley Dean Witter Funds may in their discretion limit or otherwise
restrict the number of times this Exchange Privilege may be exercised by any
investor. Any such restriction will be made by the Fund on a prospective basis
only, upon notice of the shareholder not later than ten days following such
shareholder's most recent exchange. Also, the Exchange Privilege may be
terminated or revised at any time by the Fund and/or any of such Morgan Stanley
Dean Witter Funds for which shares of the Fund have been exchanged, upon such
notice as may be required by applicable regulatory agencies. Shareholders
maintaining margin accounts with DWR or another Selected Broker-Dealer are
referred to their Morgan Stanley Dean Witter Financial Advisor or other Selected
Broker-Dealer representative regarding restrictions on exchange of shares of the
Fund pledged in the margin account.
 
    The current prospectus for each fund describes its investment objective(s)
and policies, and shareholders should obtain a copy and examine it carefully
before investing. Exchanges are subject to the minimum investment requirement of
each Class of Shares and any other conditions imposed by each fund. In the case
of any shareholder holding a share certificate or certificates, no exchanges may
be made until all applicable share certificates have been received by the
Transfer Agent and deposited in the shareholder's account. An exchange will be
treated for federal income tax purposes the same as a repurchase or redemption
of shares, on which the shareholder may realize a capital gain or loss. However,
the ability to deduct capital losses on an exchange may be limited in situations
where there is an exchange of shares within ninety days after the shares are
purchased. The Exchange Privilege is
 
                                       31
<PAGE>
only available in states where an exchange may legally be made.
 
    If DWR or another Selected Broker-Dealer is the current dealer of record and
its account numbers are part of the account information, shareholders may
initiate an exchange of shares of the Fund for shares of any of the Morgan
Stanley Dean Witter Funds (for which the Exchange Privilege is available)
pursuant to this Exchange Privilege by contacting their Morgan Stanley Dean
Witter Financial Advisor or other Selected Broker-Dealer representative (no
Exchange Privilege Authorization Form is required). Other shareholders (and
those shareholders who are clients of DWR or another Selected Broker-Dealer but
who wish to make exchanges directly by writing or telephoning the Transfer
Agent) must complete and forward to the Transfer Agent an Exchange Privilege
Authorization Form, copies of which may be obtained from the Transfer Agent, to
initiate an exchange. If the Authorization Form is used, exchanges may be made
in writing or by contacting the Transfer Agent at (800) 869-NEWS (toll free).
 
    The Fund will employ reasonable procedures to confirm that exchange
instructions communicated over the telephone are genuine. Such procedures may
include requiring various forms of personal identification such as name, mailing
address, social security or other tax identification number and DWR or other
Selected Broker-Dealer account number (if any). Telephone instructions may also
be recorded. If such procedures are not employed, the Fund may be liable for any
losses due to unauthorized or fraudulent instructions.
 
    Telephone exchange instructions will be accepted if received by the Transfer
Agent between 9:00 a.m. and 4:00 p.m., New York time, on any day the New York
Stock Exchange is open. Any shareholder wishing to make an exchange who has
previously filed an Exchange Privilege Authorization Form and who is unable to
reach the Fund by telephone should contact his or her Morgan Stanley Dean Witter
Financial Advisor or other Selected Broker-Dealer representative, if
appropriate, or make a written exchange request. Shareholders are advised that
during periods of drastic economic or market changes, it is possible that the
telephone exchange procedures may be difficult to implement, although this has
not been the experience with the Morgan Stanley Dean Witter Funds in the past.
 
    Shareholders should contact their Morgan Stanley Dean Witter Financial
Advisor or other Selected Broker-Dealer representative or the Transfer Agent for
further information about the Exchange Privilege.
 
REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------
 
    REDEMPTION.  Shares of each Class of the Fund can be redeemed for cash at
any time at the net asset value per share next determined less the amount of any
applicable CDSC in the case of Class A, Class B or Class C shares (see "Purchase
of Fund Shares--Continuous Offering"). If shares are held in a shareholder's
account without a share certificate, a written request for redemption sent to
the Fund's Transfer Agent at P.O. Box 983, Jersey City, NJ 07303 is required. If
certificates are held by the shareholder(s), the shares may be redeemed by
surrendering the certificates with a written request for redemption, along with
any additional information required by the Transfer Agent.
 
    REPURCHASE.  DWR and other Selected Broker-Dealers are authorized to
repurchase shares represented by a share certificate which is delivered to any
of their offices. Shares held in a shareholder's account without a share
certificate may also be repurchased by DWR and other Selected Broker-Dealers
upon the telephonic or telegraphic request of the shareholder. The repurchase
price is the net asset value next computed (see "Purchase of Fund
Shares--Continuous Offering") after such repurchase order is received by DWR or
other Selected Broker-Dealer, reduced by any applicable CDSC.
 
    The CDSC, if any, will be the only fee imposed by either the Fund or the
Distributor. The offer by
 
                                       32
<PAGE>
DWR and other Selected Broker-Dealers to repurchase shares may be suspended
without notice by the Distributor at any time. In that event, shareholders may
redeem their shares through the Fund's Transfer Agent as set forth above under
"Redemption."
 
    PAYMENT FOR SHARES REDEEMED OR REPURCHASED.  Payment for shares presented
for repurchase or redemption will be made by check within seven days after
receipt by the Transfer Agent of the certificate and/or written request in good
order. Such payment may be postponed or the right of redemption suspended under
unusual circumstances; e.g., when normal trading is not taking place on the New
York Stock Exchange. If the shares to be redeemed have recently been purchased
by check, payment of the redemption proceeds may be delayed for the minimum time
needed to verify that the check used for investment has been honored (not more
than fifteen days from the time of receipt of the check by the Transfer Agent).
Shareholders maintaining margin accounts with DWR or another Selected
Broker-Dealer are referred to their Morgan Stanley Dean Witter Financial Advisor
or other Selected Broker-Dealer representative regarding restrictions on
redemption of shares of the Fund pledged in the margin account.
 
    REINSTATEMENT PRIVILEGE.  A shareholder who has had his or her shares
redeemed or repurchased and has not previously exercised this reinstatement
privilege may, within 35 days after the date of the redemption or repurchase,
reinstate any portion or all of the proceeds of such redemption or repurchase in
shares of the Fund in the same Class from which such shares were redeemed or
repurchased at their net asset value next determined after a reinstatement
request, together with the proceeds, is received by the Transfer Agent and
receive a pro rata credit for any CDSC paid in connection with such redemption
or repurchase.
 
    INVOLUNTARY REDEMPTION.  The Fund reserves the right to redeem, on sixty
days' notice and at net asset value, the shares of any shareholder (other than
shares held in an Individual Retirement Account or Custodial Account under
Section 403(b)(7) of the Internal Revenue Code) whose shares due to redemptions
by the shareholder have a value of less than $100 or such lesser amount as may
be fixed by the Trustees or, in the case of an account opened through
EasyInvest-SM-, if after twelve months the shareholder has invested less than
$1,000 in the account. However, before the Fund redeems such shares and sends
the proceeds to the shareholder, it will notify the shareholder that the value
of the shares is less than the applicable amount and allow him or her sixty days
to make an additional investment in an amount which will increase the value of
his or her account to at least the applicable amount before the redemption is
processed. No CDSC will be imposed on any involuntary redemption.
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
    DIVIDENDS AND DISTRIBUTIONS.  The Fund intends to distribute substantially
all of its net investment income and distribute capital gains, if any, once each
year. The Fund may, however, determine either to distribute or to retain all or
part of any long-term capital gains in any year for reinvestment.
 
    All dividends and any capital gains distributions will be paid in additional
shares of the same Class and automatically credited to the shareholder's account
without issuance of a share certificate unless the shareholder requests in
writing that all dividends and/or distributions be paid in cash. Shares acquired
by dividend and distribution reinvestments will not be subject to any front-end
sales charge or CDSC. Class B shares acquired through dividend and distribution
reinvestments will become eligible for conversion to Class A shares on a pro
rata basis. Distributions paid on Class A and Class D shares will be higher than
for Class B and Class C shares because distribution fees paid by Class B and
Class C shares are higher. (See "Shareholder
 
                                       33
<PAGE>
Services--Automatic Investment of Dividends and Distributions.")
 
    TAXES.  Because the Fund intends to distribute all of its net investment
income and net short-term capital gains to shareholders and otherwise qualify as
a regulated investment company under Subchapter M of the Internal Revenue Code,
it is not expected that the Fund will be required to pay any Federal income tax
on any such income and capital gains. Shareholders will normally have to pay
Federal income taxes, and any state and local income taxes, on the dividends and
distributions they receive from the Fund. Any dividends declared in the last
quarter of any calendar year which are paid in the following year prior to
February 1 will be deemed for tax purposes to have been received in the prior
year.
 
    Distributions of net long-term capital gains, if any, are taxable to
shareholders as long-term capital gains regardless of how long a shareholder has
held the Fund's shares and regardless of whether the distribution is received in
additional shares or in cash. Capital gains distributions are not eligible for
the dividends received deduction.
 
    After the end of the calendar year, shareholders will be sent full
information on their dividends and capital gains distributions for tax purposes.
Shareholders will also be notified of their proportionate share of long-term
capital gains distribution that are eligible for a reduced rate of tax under the
Taxpayer Relief Act of 1997. To avoid being subject to a 31% Federal backup
withholding tax on taxable dividends, capital gains distributions and the
proceeds of redemptions and repurchases, shareholders' taxpayer identification
numbers must be furnished and certified as to their accuracy.
 
    Shareholders should consult their tax advisors as to the applicability of
the foregoing to their current situation.
 
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
    From time to time the Fund may quote its "total return" in advertisements
and sales literature. These figures are computed separately for Class A, Class
B, Class C and Class D shares. The total return of the Fund is based on
historical earnings and is not intended to indicate future performance.
 
    The "average annual total return" of the Fund refers to a figure reflecting
the average annualized percentage increase (or decrease) in the value of an
initial investment in a Class of the Fund of $1,000 over periods of one, five
and ten years, or the life of the Fund, if less than any of the foregoing.
Average annual total return reflects all income earned by the Fund, any
appreciation or depreciation of the Fund's assets, all expenses incurred by the
applicable Class and all sales charges which will be incurred by shareholders,
for the stated periods. It also assumes reinvestment of all dividends and
distributions paid by the Fund.
 
    In addition to the foregoing, the Fund may advertise its total return for
each Class over different periods of time by means of aggregate, average, and
year-by-year or other types of total return figures. Such calculations may or
may not reflect the deduction of any sales charge which, if reflected, would
reduce the performance quoted. The Fund may also advertise the growth of
hypothetical investments of $10,000, $50,000 and $100,000 in each Class of
shares of the Fund. The Fund from time to time may also advertise its
performance relative to certain performance rankings and indexes compiled by
independent organizations, such as mutual fund performance rankings of Lipper
Analytical Services, Inc.
 
                                       34
<PAGE>
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
    VOTING RIGHTS.  All shares of beneficial interest of the Fund are of $0.01
par value and are equal as to earnings, assets and voting privileges except that
each Class of the Fund will have exclusive voting privileges with respect to
matters relating to distribution expenses borne solely by such Class or any
other matter in which the interests of one Class differ from the interests of
any other Class. In addition, Class B shareholders will have the right to vote
on any proposed material increase in Class A's expenses, if such proposal is
submitted separately to Class A shareholders. Also, as discussed herein, Class
A, Class B and Class C bear the expenses related to the distribution of their
respective shares.
 
    The Fund is not required to hold Annual Meetings of Shareholders and, in
ordinary circumstances, the Fund does not intend to hold such meetings. The
Trustees may call Special Meetings of Shareholders for action by shareholder
vote as may be required by the Act or the Declaration of Trust. Under certain
circumstances the Trustees may be removed by action of the Trustees or by the
shareholders.
 
    Under Massachusetts law, shareholders of a business trust may, under certain
circumstances, be held personally liable as partners for obligations of the
Fund. However, the Declaration of Trust contains an express disclaimer of
shareholder liability for acts or obligations of the Fund, requires that Fund
obligations include such disclaimer, and provides for indemnification and
reimbursement of expenses out of the Fund's property for any shareholder held
personally liable for the obligations of the Fund. Thus, the risk of a
shareholder incurring financial loss on account of shareholder liability is
limited to circumstances in which the Fund itself would be unable to meet its
obligations. Given the above limitations on shareholder personal liability, and
the nature of the Fund's assets and operations, in the opinion of Massachusetts
counsel to the Fund, the risk to shareholders of personal liability is remote.
 
    CODE OF ETHICS.  Directors, officers and employees of MSDW Advisors, MSDW
Services and MSDW Distributors are subject to a strict Code of Ethics adopted by
those companies. The Code of Ethics is intended to ensure that the interests of
shareholders and other clients are placed ahead of any personal interest, that
no undue personal benefit is obtained from a person's employment activities and
that actual and potential conflicts of interest are avoided. To achieve these
goals and comply with regulatory requirements, the Code of Ethics requires,
among other things, that personal securities transactions by employees of the
companies be subject to an advance clearance process to monitor that no Morgan
Stanley Dean Witter Fund is engaged at the same time in a purchase or sale of
the same security. The Code of Ethics bans the purchase of securities in an
initial public offering, and also prohibits engaging in futures and options
transactions and profiting on short-term trading (that is, a purchase within
sixty days of a sale or a sale within sixty days of a purchase) of a security.
In addition, investment personnel may not purchase or sell a security for their
personal account within thirty days before or after any transaction in any
Morgan Stanley Dean Witter Fund managed by them. Any violations of the Code of
Ethics are subject to sanctions, including reprimand, demotion or suspension or
termination of employment. The Code of Ethics comports with regulatory
requirements and the recommendations in the 1994 report by the Investment
Company Institute Advisory Group on Personal Investing.
 
    MASTER/FEEDER CONVERSION.  The Fund reserves the right to seek to achieve
its investment objective by investing all of its investable assets in a
diversified, open-end management investment company having the same investment
objective and policies and substantially the same investment restrictions as
those applicable to the Fund.
 
    SHAREHOLDER INQUIRIES.  All inquiries regarding the Fund should be directed
to the Fund at the tele-
 
                                       35
<PAGE>
phone numbers or address set forth on the front cover of this Prospectus.
 
    The Investment Manager provided the initial capital for the Fund of $100,000
on November 6, 1997. At that time, the Fund consisted of two separate
portfolios, and the Investment Manager received 1,250 shares each of Class A,
Class B, Class C and Class D of each portfolio for $12,500, respectively. As of
the date of this Prospectus, the Investment Manager owns 2,500 shares each of
Class A, Class B, Class C and Class D of the Fund, which amounts to 100% of the
outstanding shares of the Fund for a total of $100,000. The Investment Manager
may be deemed to control the Fund until such time as it owns less than 25% of
the outstanding shares of the Fund.
 
                                       36
<PAGE>
Morgan Stanley Dean Witter
Aggressive Equity Fund
Two World Trade Center
New York, New York 10048
 
TRUSTEES
 
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Wayne E. Hedien
Dr. Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
 
OFFICERS
 
Charles A. Fiumefreddo
Chairman and Chief Executive Officer
Barry Fink
Vice President, Secretary and General Counsel
Anita H. Kolleeny
Vice President
Michelle Kaufman
Vice President
Thomas F. Caloia
Treasurer
 
CUSTODIAN
 
The Bank of New York
90 Washington Street
New York, New York 10286
 
TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
 
Morgan Stanley Dean Witter Trust FSB
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311
 
INDEPENDENT ACCOUNTANTS
 
PricewaterhouseCoopers LLP
1177 Avenue of the Americas
New York, New York 10036
 
INVESTMENT MANAGER
 
Morgan Stanley Dean Witter Advisors Inc.
 
MORGAN STANLEY
DEAN WITTER
AGGRESSIVE
EQUITY FUND
 
                               [PHOTO]
                                                 PROSPECTUS -- DECEMBER 23, 1998


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