MORGAN STANLEY WITTER DEAN AGGRESSIVE EQUITY FUND
497, 1999-01-12
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                         MORGAN STANLEY DEAN WITTER
                         AGGRESSIVE EQUITY FUND
   
                         PROSPECTUS--DECEMBER 23, 1998
    
 
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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.
 
   
<TABLE>
<CAPTION>
TABLE OF CONTENTS
 
<S>                                                 <C>
Prospectus Summary................................       2
 
Summary of Fund Expenses..........................       4
 
The Fund and its Management.......................       5
 
Investment Objective and Policies.................       5
 
  Risk Considerations and Investment Practices....       7
 
Investment Restrictions...........................      12
 
Underwriting......................................      13
 
Purchase of Fund Shares--Continuous Offering......      13
 
Shareholder Services..............................      21
 
Redemptions and Repurchases.......................      23
 
Dividends, Distributions and Taxes................      24
 
Performance Information...........................      24
 
Additional Information............................      25
</TABLE>
    
 
   
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.
 
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)
 
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  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 DISTRIBUTORS INC., DISTRIBUTOR
<PAGE>
PROSPECTUS SUMMARY
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<TABLE>
<S>             <C>
THE FUND        The Fund is organized as a Trust commonly referred to as a Massachusetts business trust,
                and is an open- end, 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 25). The Fund offers four
                Classes of shares, each with a different combination of sales charges, ongoing fees and
                other features (see page 13).
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INITIAL         Shares of the Fund are being offered in an underwriting by Morgan Stanley Dean Witter
OFFERING        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 13).
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CONTINUOUS      A continuous offering of shares of the Fund will commence within approximately two weeks
OFFERING/       after the Closing Date, unless the Fund suspends the offering of its shares to new
MINIMUM         investors. The minimum initial investment for each Class of shares is $1,000 ($100 if
PURCHASE        the account is opened through EasyInvest-SM-). Class D shares are only 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 13).
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INVESTMENT      The investment objective of the Fund is capital growth (see page 5).
OBJECTIVE
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INVESTMENT      Morgan Stanley Dean Witter Advisors Inc., the Investment Manager of the Fund, and its
MANAGER         wholly-owned subsidiary, 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 FEE  The Investment Manager receives a monthly fee at the annual rate of 0.75% of the Fund's
                average daily net assets (see page 5).
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UNDERWRITER     Morgan Stanley Dean Witter Distributors Inc. is the Fund's Underwriter and Distributor
AND             of the Fund's shares. The Fund has adopted a distribution plan pursuant to Rule 12b-1
DISTRIBUTOR     under the Investment Company Act (the "12b-1 Plan") with respect to the distribution
AND             fees paid by the Class A, Class B and Class C shares of the Fund to the Distributor. The
DISTRIBUTION    entire 12b-1 fee payable by Class A and a portion of the 12b-1 fee payable by each of
FEE             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 13 and 19).
</TABLE>
    
 
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2
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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 13, 16 and 19).
 
                - 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 13, 17
                and 19).
 
                - 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 13 and 19).
 
                - 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 13 and 19).
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DIVIDENDS AND   Dividends from net investment income and distributions from net capital gains, if any,
CAPITAL GAINS   are paid at least once per year. The Fund may, however, determine to retain all or part
DISTRIBUTIONS   of any long-term net capital gains in any year 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 21 and 24).
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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 23).
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RISK            An investment in the Fund should be considered a long-term holding and subject to all
CONSIDERATIONS  the risks associated with 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 6-12).
</TABLE>
    
 
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  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
              ELSEWHERE IN THIS PROSPECTUS AND IN THE STATEMENT OF
                            ADDITIONAL INFORMATION.
 
                                                                               3
<PAGE>
SUMMARY OF FUND EXPENSES
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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
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>
 
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*  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."
 
<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.
 
4
<PAGE>
THE FUND AND ITS MANAGEMENT
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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 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
    
 
                                                                               5
<PAGE>
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, (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
 
6
<PAGE>
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 "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 developments 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
    
 
                                                                               7
<PAGE>
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 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,
 
8
<PAGE>
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 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 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.
 
                                                                               9
<PAGE>
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 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
 
10
<PAGE>
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 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 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
 
                                                                              11
<PAGE>
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.
    
 
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.
 
12
<PAGE>
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").
    
 
    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
 
                                                                              13
<PAGE>
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 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
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
 
14
<PAGE>
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 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.
 
                                                                              15
<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% initial        0.25%          No
           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 during     1.0%     B shares
           the first year decreasing             convert to A
           to 0 after six years                  shares
                                                 automatically
                                                 after
                                                 approximately
                                                 ten years
    C      1.0% CDSC during first       1.0%           No
           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
    SINGLE TRANSACTION             PRICE         AMOUNT 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, 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.
 
16
<PAGE>
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.
 
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
 
                                                                              17
<PAGE>
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 the shares have been held, as set forth in the following table:
 
<TABLE>
<CAPTION>
          YEAR SINCE PURCHASE             CDSC AS A PERCENTAGE
              PAYMENT MADE                 OF 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, 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
 
18
<PAGE>
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 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.
    
 
                                                                              19
<PAGE>
    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, 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
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.
 
20
<PAGE>
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 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
 
                                                                              21
<PAGE>
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.
 
   
    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 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
 
22
<PAGE>
(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 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
 
                                                                              23
<PAGE>
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 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.
 
24
<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 telephone 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.
 
                                                                              25
<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.
<PAGE>
 
   
STATEMENT OF ADDITIONAL         MORGAN STANLEY DEAN WITTER
INFORMATION                     AGGRESSIVE EQUITY FUND
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 its investment 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.
    
 
   
    A Prospectus for the Fund dated December 23, 1998, which provides the basic
information you should know before investing in the Fund, may be obtained
without charge from the Fund at its address or telephone numbers listed below or
from the Fund's Distributor, Morgan Stanley Dean Witter Distributors Inc., or
from Dean Witter Reynolds Inc. at any of its branch offices. This Statement of
Additional Information is not a Prospectus. It contains information in addition
to and more detailed than that set forth in the Prospectus. It is intended to
provide you additional information regarding the activities and operations of
the Fund, and should be read in conjunction with the Prospectus.
    
 
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>
TABLE OF CONTENTS
- --------------------------------------------------------------------------------
 
   
<TABLE>
<S>                                                                                      <C>
The Fund and its Management............................................................          3
 
Trustees and Officers..................................................................          7
 
Investment Practices and Policies......................................................         13
 
Investment Restrictions................................................................         29
 
Portfolio Transactions and Brokerage...................................................         30
 
Underwriting...........................................................................         31
 
The Distributor........................................................................         32
 
Determination of Net Asset Value.......................................................         35
 
Purchase of Fund Shares................................................................         35
 
Shareholder Services...................................................................         38
 
Redemptions and Repurchases............................................................         43
 
Dividends, Distributions and Taxes.....................................................         44
 
Performance Information................................................................         45
 
Description of Shares of The Fund......................................................         46
 
Custodian and Transfer Agent...........................................................         46
 
Independent Accountants................................................................         47
 
Reports to Shareholders................................................................         47
 
Legal Counsel..........................................................................         47
 
Experts................................................................................         47
 
Registration Statement.................................................................         47
 
Statement of Assets and Liabilities at November 6, 1998................................         48
 
Report of Independent Accountants......................................................         50
 
Appendix--Ratings of Investments.......................................................         51
</TABLE>
    
 
                                       2
<PAGE>
THE FUND AND ITS MANAGEMENT
- --------------------------------------------------------------------------------
 
THE FUND
 
    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. On November 12,
1997, the Trustees of the Fund adopted an Amendment to the Declaration of Trust
of the Fund changing its name to Dean Witter Research Fund and on December 9,
1997 adopted an Amendment to the Declaration of Trust changing its name to
Morgan Stanley Dean Witter Research Fund. On November 9, 1998 the Trustees of
the Fund adopted an Amendment to the Declaration of Trust of the Fund changing
its name to Morgan Stanley Dean Witter Aggressive Equity Fund.
 
THE INVESTMENT MANAGER
 
    Morgan Stanley Dean Witter Advisors Inc. (the "Investment Manager" or "MSDW
Advisors"), a Delaware corporation, whose address is Two World Trade Center, New
York, New York, 10048, is the Fund's investment manager. MSDW Advisors is a
wholly-owned subsidiary of Morgan Stanley Dean Witter & Co. ("MSDW"), a Delaware
corporation. The daily management of the Fund and research relating to the
Fund's portfolio are conducted by or under the direction of officers of the Fund
and of the Investment Manager, subject to review by the Fund's Board of
Trustees. Information as to these Trustees and officers is contained under the
caption, "Trustees and Officers."
 
    MSDW Advisors is the investment manager or investment advisor of the
following investment companies, which are collectively referred to as the
"Morgan Stanley Dean Witter Funds":
 
<TABLE>
<CAPTION>
OPEN-END FUNDS
 
<C>  <S>
  1  Active Assets California Tax-Free Trust
  2  Active Assets Government Securities Trust
  3  Active Assets Money Trust
  4  Active Assets Tax-Free Trust
  5  Morgan Stanley Dean Witter American Value Fund
  6  Morgan Stanley Dean Witter Balanced Growth Fund
  7  Morgan Stanley Dean Witter Balanced Income Fund
  8  Morgan Stanley Dean Witter California Tax-Free Daily Income Trust
  9  Morgan Stanley Dean Witter California Tax-Free Income Fund
 10  Morgan Stanley Dean Witter Capital Appreciation Fund
 11  Morgan Stanley Dean Witter Capital Growth Securities
 12  Morgan Stanley Dean Witter Competitive Edge Fund, "BEST IDEAS" Portfolio
 13  Morgan Stanley Dean Witter Convertible Securities Trust
 14  Morgan Stanley Dean Witter Developing Growth Securities Trust
 15  Morgan Stanley Dean Witter Diversified Income Trust
 16  Morgan Stanley Dean Witter Dividend Growth Securities Inc.
 17  Morgan Stanley Dean Witter Equity Fund
 18  Morgan Stanley Dean Witter European Growth Fund Inc.
 19  Morgan Stanley Dean Witter Federal Securities Trust
 20  Morgan Stanley Dean Witter Financial Services Trust
 21  Morgan Stanley Dean Witter Fund of Funds
 22  Morgan Stanley Dean Witter Global Dividend Growth Securities
 23  Morgan Stanley Dean Witter Global Short-Term Income Fund Inc.
 24  Morgan Stanley Dean Witter Global Utilities Fund
 25  Morgan Stanley Dean Witter Growth Fund
 26  Morgan Stanley Dean Witter Hawaii Municipal Trust
 27  Morgan Stanley Dean Witter Health Sciences Trust
 28  Morgan Stanley Dean Witter High Yield Securities Inc.
</TABLE>
 
                                       3
<PAGE>
   
<TABLE>
<C>  <S>
 29  Morgan Stanley Dean Witter Income Builder Fund
 30  Morgan Stanley Dean Witter Information Fund
 31  Morgan Stanley Dean Witter Intermediate Income Securities
 32  Morgan Stanley Dean Witter International SmallCap Fund
 33  Morgan Stanley Dean Witter Japan Fund
 34  Morgan Stanley Dean Witter Limited Term Municipal Trust
 35  Morgan Stanley Dean Witter Liquid Asset Fund Inc.
 36  Morgan Stanley Dean Witter Market Leader Trust
 37  Morgan Stanley Dean Witter Mid-Cap Dividend Growth Securities
 38  Morgan Stanley Dean Witter Mid-Cap Growth Fund
 39  Morgan Stanley Dean Witter Multi-State Municipal Series Trust
 40  Morgan Stanley Dean Witter Natural Resource Development Securities Inc.
 41  Morgan Stanley Dean Witter New York Municipal Money Market Trust
 42  Morgan Stanley Dean Witter New York Tax-Free Income Fund
 43  Morgan Stanley Dean Witter Pacific Growth Fund Inc.
 44  Morgan Stanley Dean Witter Precious Metals and Minerals Trust
 45  Morgan Stanley Dean Witter Select Dimensions Investment Series
 46  Morgan Stanley Dean Witter Select Municipal Reinvestment Fund
 47  Morgan Stanley Dean Witter Short-Term Bond Fund
 48  Morgan Stanley Dean Witter Short-Term U.S. Treasury Trust
 49  Morgan Stanley Dean Witter Special Value Fund
 50  Morgan Stanley Dean Witter S&P 500 Index Fund
 51  Morgan Stanley Dean Witter S&P 500 Select Fund
 52  Morgan Stanley Dean Witter Strategist Fund
 53  Morgan Stanley Dean Witter Tax-Exempt Securities Trust
 54  Morgan Stanley Dean Witter Tax-Free Daily Income Trust
 55  Morgan Stanley Dean Witter U.S. Government Money Market Trust
 56  Morgan Stanley Dean Witter U.S. Government Securities Trust
 57  Morgan Stanley Dean Witter Utilities Fund
 58  Morgan Stanley Dean Witter Value-Added Market Series
 59  Morgan Stanley Dean Witter Value Fund
 60  Morgan Stanley Dean Witter Variable Investment Series
 61  Morgan Stanley Dean Witter World Wide Income Trust
 
CLOSED-END FUNDS
 
  1  Morgan Stanley Dean Witter California Insured Municipal Income Trust
  2  Morgan Stanley Dean Witter California Quality Municipal Securities
  3  Morgan Stanley Dean Witter Government Income Trust
  4  Morgan Stanley Dean Witter High Income Advantage Trust
  5  Morgan Stanley Dean Witter High Income Advantage Trust II
  6  Morgan Stanley Dean Witter High Income Advantage Trust III
  7  Morgan Stanley Dean Witter Income Securities Inc.
  8  Morgan Stanley Dean Witter Insured California Municipal Securities
  9  Morgan Stanley Dean Witter Insured Municipal Bond Trust
 10  Morgan Stanley Dean Witter Insured Municipal Income Trust
 11  Morgan Stanley Dean Witter Insured Municipal Securities
 12  Morgan Stanley Dean Witter Insured Municipal Trust
 13  Morgan Stanley Dean Witter Municipal Income Opportunities Trust
 14  Morgan Stanley Dean Witter Municipal Income Opportunities Trust II
 15  Morgan Stanley Dean Witter Municipal Income Opportunities Trust III
 16  Morgan Stanley Dean Witter Municipal Income Trust
 17  Morgan Stanley Dean Witter Municipal Income Trust II
 18  Morgan Stanley Dean Witter Municipal Income Trust III
</TABLE>
    
 
                                       4
<PAGE>
   
<TABLE>
<C>  <S>
 19  Morgan Stanley Dean Witter Municipal Premium Income Trust
 20  Morgan Stanley Dean Witter New York Quality Municipal Securities
 21  Morgan Stanley Dean Witter Prime Income Trust
 22  Morgan Stanley Dean Witter Quality Municipal Income Trust
 23  Morgan Stanley Dean Witter Quality Municipal Investment Trust
 24  Morgan Stanley Dean Witter Quality Municipal Securities
</TABLE>
    
 
    In addition, Morgan Stanley Dean Witter Services Company Inc. ("MSDW
Services"), a wholly-owned subsidiary of MSDW Advisors, serves as manager for
the following investment companies for which TCW Funds Management, Inc. is the
investment advisor (the "TCW/DW Funds"):
 
<TABLE>
<CAPTION>
OPEN-END FUNDS
 
<C>  <S>
  1  TCW/DW Emerging Markets Opportunities Trust
  2  TCW/DW Global Telecom Trust
  3  TCW/DW Income and Growth Fund
  4  TCW/DW Latin American Growth Fund
  5  TCW/DW Mid-Cap Equity Trust
  6  TCW/DW North American Government Income Trust
  7  TCW/DW Small Cap Growth Fund
  8  TCW/DW Total Return Trust
 
CLOSED-END FUNDS
 
  1  TCW/DW Term Trust 2000
  2  TCW/DW Term Trust 2002
  3  TCW/DW Term Trust 2003
</TABLE>
 
    MSDW Advisors also serves as: (i) administrator of The BlackRock Strategic
Term Trust Inc., a closed-end investment company; (ii) sub-administrator of
Templeton Global Governments Income Trust, a closed-end investment company; and
(iii) investment advisor of Offshore Dividend Growth Fund and Offshore Money
Market Fund, mutual funds established under the laws of the Cayman Islands and
available only to investors who are participants in the International Active
Assets Account program and are neither citizens nor residents of the United
States.
 
    Pursuant to an Investment Management Agreement (the "Agreement") with the
Investment Manager, the Fund has retained the Investment Manager to manage the
investment of the Fund's assets, including the placing of orders for the
purchase and sale of portfolio securities. The Investment Manager obtains and
evaluates such information and advice relating to the economy, securities
markets, and specific securities as it considers necessary or useful to
continuously manage the assets of the Fund in a manner consistent with its
investment objective and policies.
 
    Under the terms of the Agreement, in addition to managing the Fund's
investments, the Investment Manager maintains certain of the Fund's books and
records and furnishes, at its own expense, such office space, facilities,
equipment, clerical help, bookkeeping and certain legal services as the Fund may
reasonably require in the conduct of its business, including the preparation of
prospectuses, proxy statements and reports required to be filed with federal and
state securities commissions (except insofar as the participation or assistance
of independent accountants and attorneys is, in the opinion of the Investment
Manager, necessary or desirable). In addition, the Investment Manager pays the
salaries of all personnel, including officers of the Fund, who are employees of
the Investment Manager. The Investment Manager also bears the cost of telephone
service, heat, light, power and other utilities provided to the Fund. The
Investment Manager has retained MSDW Services to provide its administrative
services under the Agreement.
 
    Expenses not expressly assumed by the Investment Manager under the Agreement
or by the Distributor of the Fund's shares, Morgan Stanley Dean Witter
Distributors Inc. ("MSDW Distributors" or the "Distributor") (see "The
Distributor"), will be paid by the Fund. These expenses will be allocated
 
                                       5
<PAGE>
among the four classes of shares of the Fund (each, a "Class") pro rata based on
the net assets of the Fund attributable to each Class, except as described
below. Such expenses include, but are not limited to: expenses of the Plan of
Distribution pursuant to Rule 12b-1 (the "12b-1 fee") (see "The Distributor");
charges and expenses of any registrar, custodian, share transfer and dividend
disbursing agent; brokerage commissions; taxes; engraving and printing share
certificates; registration costs of the Fund and its shares under federal and
state securities laws; the cost and expenses of printing, including typesetting,
and distributing prospectuses of the Fund and supplements thereto to the Fund's
shareholders; all expenses of shareholders' and Trustees' meetings and of
preparing, printing and mailing proxy statements and reports to shareholders;
fees and travel expenses of Trustees or members of any advisory board or
committee who are not employees of the Investment Manager or any corporate
affiliate of the Investment Manager; all expenses incident to any dividend,
withdrawal or redemption options; any charges and expenses of any outside
service used for pricing of the Fund's shares; fees and expenses of legal
counsel, including counsel to the Trustees who are not interested persons of the
Fund or of the Investment Manager (not including compensation or expenses of
attorneys who are employees of the Investment Manager) and independent
accountants; membership dues of industry associations; interest on Fund
borrowings; postage; insurance premiums on property or personnel (including
officers and Trustees) of the Fund which inure to its benefit; extraordinary
expenses (including, but not limited to, legal claims and liabilities and
litigation costs and any indemnification relating thereto; depending upon the
nature of the legal claim, liability or lawsuit, the costs of litigation,
payment of legal claims or liabilities or indemnification relating thereto may
be directly applicable to the Fund or may be proportionately allocated on the
basis of the size of the Fund. The Trustees have determined that this is an
appropriate method of allocation of such expenses); and all other costs of the
Fund's operation properly payable by the Fund and allocable on the basis of size
of the respective Fund. The 12b-1 fees relating to a particular Class of the
Fund will be allocated directly to that Class. In addition, other expenses
associated with a particular Class of a particular Fund (except custodial fees)
may be allocated directly to that Class, provided that such expenses are
reasonably identified as specifically attributable to that Class and the direct
allocation to that Class is approved by the Trustees.
 
    The Investment Manager has agreed to assume all operating expenses (except
for brokerage and 12b-1 fees) and to waive the compensation provided for in its
investment management agreement until such time as the Fund has $50 million of
net assets or six months from the date of commencement of the Fund's operations,
whichever occurs first.
 
    The Investment Manager will absorb the organizational expenses of the Fund
incurred prior to the offering of its shares which is estimated to be
approximately $17,000. The offering costs of the Fund will be deferred and
amortized on the straight line method over a period of benefit of approximately
one year or less from the date of commencement of the Fund's operations.
 
    As full compensation for the services and facilities furnished to the Fund
and expenses of the Fund assumed by the Investment Manager, the Fund pays the
Investment Manager monthly compensation calculated daily by applying the annual
rate of 0.75% to the Fund's daily net assets. The management fee is allocated
among the Classes of the Fund pro rata based on the net assets of the
attributable to each Class.
 
    The Agreement provides that in the absence of willful misfeasance, bad
faith, gross negligence or reckless disregard of its obligations thereunder, the
Investment Manager is not liable to the Fund or any of its investors for any act
or omission by the Investment Manager or for any losses sustained by the Fund or
its investors. The Agreement in no way restricts the Investment Manager from
acting as investment manager or adviser to others.
 
   
    The Agreement was initially approved by the Board of Trustees on December 2,
1998 and by MSDW Advisor, as the then sole shareholder, on December 2, 1998. The
Agreement may be terminated, at any time, without penalty, on thirty days'
notice by the Board of Trustees of the Fund, by the holders of a
    
 
                                       6
<PAGE>
majority, as defined in the Investment Company Act of 1940 (the "Act"), of the
outstanding shares of the Fund, or by the Investment Manager. The Agreement will
automatically terminate in the event of its assignment (as defined in the Act).
 
    Under its terms, the Agreement has an initial term ending April 30, 2000 and
will remain in effect from year to year thereafter, provided continuance of the
Agreement is approved at least annually by the vote of the holders of a
majority, as defined in the Act, of the outstanding shares of the Fund, or by
the Board of Trustees of the Fund; provided that in either event such
continuance is approved annually by the vote of a majority of the Trustees of
the Fund who are not parties to the Agreement or "interested persons" (as
defined in the Act) of any such party (the "Independent Trustees"), which vote
must be cast in person at a meeting called for the purpose of voting on such
approval.
 
    The Fund has acknowledged that the name "Morgan Stanley Dean Witter" is a
property right of MSDW. The Fund has agreed that MSDW, or any corporate
affiliate of MSDW, may use or, at any time, permit others to use, the name
"Morgan Stanley Dean Witter." The Fund has also agreed that in the event the
Agreement is terminated, or if the affiliation between MSDW Advisors and its
parent company is terminated, the Fund will eliminate the name "Morgan Stanley
Dean Witter" from its name if MSDW, or any corporate affiliate of MSDW, shall so
request.
 
TRUSTEES AND OFFICERS
- --------------------------------------------------------------------------------
 
    The Trustees and Executive Officers of the Fund, their principal business
occupations during the last five years and their affiliations, if any, with MSDW
Advisors, and with the 85 Morgan Stanley Dean Witter Funds and the 11 TCW/DW
Funds are shown below:
 
   
<TABLE>
<CAPTION>
      NAME, AGE, POSITION WITH FUND AND ADDRESS                PRINCIPAL OCCUPATION DURING LAST FIVE YEARS
- ------------------------------------------------------  ----------------------------------------------------------
<S>                                                     <C>
Michael Bozic (57) ...................................  Vice Chairman of Kmart Corporation (since December, 1998);
Trustee                                                 Chairman and Chief Executive Officer of Levitz Furniture
c/o Kmart Corporation                                   Corporation (since November, 1995); Director or Trustee of
3100 West Big Beaver Road                               the Morgan Stanley Dean Witter Funds; formerly Chairman
Troy, Michigan                                          and Chief Executive Officer of Levitz Furniture
                                                        Corporation (November, 1995-November, 1998) and President
                                                        and Chief Executive Officer of Hills Department Stores
                                                        (May, 1991-July, 1995); formerly variously Chairman, Chief
                                                        Executive Officer, President and Chief Operating Officer
                                                        (1987-1991) of the Sears Merchandise Group of Sears,
                                                        Roebuck and Co.; Director of Eaglemark Financial Services,
                                                        Inc. and Weirton Steel Corporation.
Charles A. Fiumefreddo* (65) .........................  Chairman, Director or Trustee, President and Chief
Chairman, President                                     Executive Officer of the Morgan Stanley Dean Witter Funds;
Chief Executive Officer and Trustee                     Chairman, Chief Executive Officer and Trustee of the
Two World Trade Center                                  TCW/DW Funds; formerly Chairman, Chief Executive Officer
New York, New York                                      and Director of MSDW Advisors, MSDW Distributors and MSDW
                                                        Services, Executive Vice President and Director of Dean
                                                        Witter Reynolds Inc. ("DWR"), Chairman and Director of
                                                        Morgan Stanley Dean Witter Trust FSB ("MSDW Trust"), and
                                                        Director and/or officer of various MSDW subsidiaries
                                                        (until June, 1998).
</TABLE>
    
 
                                       7
<PAGE>
<TABLE>
<CAPTION>
      NAME, AGE, POSITION WITH FUND AND ADDRESS                PRINCIPAL OCCUPATION DURING LAST FIVE YEARS
- ------------------------------------------------------  ----------------------------------------------------------
<S>                                                     <C>
Edwin J. Garn (65) ...................................  Director or Trustee of the Morgan Stanley Dean Witter
Trustee                                                 Funds; formerly United States Senator (R-Utah) (1974-1992)
c/o Huntsman Corporation                                and Chairman, Senate Banking Committee (1980-1986);
500 Huntsman Way                                        formerly Mayor of Salt Lake City, Utah (1972-1974);
Salt Lake City, Utah                                    formerly Astronaut, Space Shuttle Discovery (April 12-19,
                                                        1985); Vice Chairman, Huntsman Corporation; Director of
                                                        Franklin Covey (time management systems) and John Alden
                                                        Financial Corp. (health insurance); United Space Alliance
                                                        (joint venture between Lockheed Martin and the Boeing
                                                        Company) and Nuskin Asia Pacific
                                                        (Multilevel Marketing); member of the board of various
                                                        civic and charitable organizations.
John R. Haire (73) ...................................  Chairman of the Audit Committee and Director or Trustee of
Trustee                                                 the Morgan Stanley Dean Witter Funds; Chairman of the
Two World Trade Center                                  Audit Committee and Trustee of the TCW/DW Funds; formerly
New York, New York                                      Chairman of the Independent Directors or Trustees of the
                                                        Morgan Stanley Dean Witter Funds and the TCW/DW Funds
                                                        (until June, 1998); formerly President, Council for Aid to
                                                        Education (1978-1989) and Chairman and Chief Executive
                                                        Officer of Anchor Corporation, an Investment Adviser
                                                        (1964-1978).
Wayne E. Hedien (64) .................................  Retired; Director or Trustee of the Morgan Stanley Dean
Trustee                                                 Witter Funds; Director of The PMI Group, Inc. (private
c/o Gordon Altman Butowsky                              mortgage insurance); Trustee and Vice Chairman of The
 Weitzen Shalov & Wein                                  Field Museum of Natural History; formerly associated with
Counsel to the Independent Trustees                     the Allstate Companies (1966-1994), most recently as
114 West 47th Street                                    Chairman of The Allstate Corporation (March,
New York, New York                                      1993-December, 1994) and Chairman and Chief Executive
                                                        Officer of its wholly-owned subsidiary, Allstate Insurance
                                                        Company (July, 1989-December, 1994); director of various
                                                        other business and charitable organizations.
Dr. Manuel H. Johnson (49) ...........................  Senior Partner, Johnson Smick International, Inc., a
Trustee                                                 consulting firm; Co-Chairman and a founder of the Group of
c/o Johnson Smick International, Inc.                   Seven Council (G7C), an international economic commission;
1133 Connecticut Avenue, N.W.                           Director or Trustee of the
Washington, DC                                          Morgan Stanley Dean Witter Funds; Trustee of the TCW/DW
                                                        Funds; Director of NASDAQ (since June, 1995); Director of
                                                        Greenwich Capital Markets, Inc. (broker-dealer) and NVR
                                                        Inc. (home construction); Chairman and Trustee of the
                                                        Financial Accounting Foundation (oversight organization
                                                        for the Financial Accounting Standards Board); formerly
                                                        Vice Chairman of the Board of Governors of the Federal Re-
                                                        serve System (1986-1990) and Assistant Secretary of the
                                                        U.S. Treasury (1982-1986).
</TABLE>
 
                                       8
<PAGE>
<TABLE>
<CAPTION>
      NAME, AGE, POSITION WITH FUND AND ADDRESS                PRINCIPAL OCCUPATION DURING LAST FIVE YEARS
- ------------------------------------------------------  ----------------------------------------------------------
<S>                                                     <C>
Michael E. Nugent (62) ...............................  General Partner, Triumph Capital, L.P., a private in-
Trustee                                                 vestment partnership; Director or Trustee of the
c/o Triumph Capital, L.P.                               Morgan Stanely Dean Witter Funds; Trustee of the TCW/DW
237 Park Avenue                                         Funds; formerly Vice President, Bankers Trust Company and
New York, New York                                      BT Capital Corporation (1984-1988); director of various
                                                        business organizations.
Philip J. Purcell* (55) ..............................  Chairman of the Board of Directors and Chief Executive
Trustee                                                 Officer of MSDW, DWR and Novus Credit Services Inc.;
1585 Broadway                                           Director of MSDW Advisors, MSDW Services and MSDW
New York, New York                                      Distributors; Director or Trustee of the Morgan Stanley
                                                        Dean Witter Funds; Director and/or officer of various MSDW
                                                        subsidiaries.
John L. Schroeder (68) ...............................  Retired; Director or Trustee of the Morgan Stanley Dean
Trustee                                                 Witter Funds; Trustee of the TCW/DW Funds; Director of
c/o Gordon Altman Butowsky Weitzen                      Citizens Utilities Company; formerly Executive Vice
  Shalov & Wein                                         President and Chief Investment Officer of the Home
Counsel to the Independent Trustees                     Insurance Company (August, 1991-September, 1995).
114 West 47th Street
New York, New York
Anita H. Kolleeny (43) ...............................  Senior Vice President of MSDW Advisors; Vice President of
Vice President                                          various Morgan Stanley Dean Witter Funds.
Two World Trade Center
New York, New York
Michelle Kaufman (34) ................................  Vice President of MSDW Advisors; Vice President or
Vice President                                          Assistant Vice President of various Morgan Stanley Dean
Two World Trade Center                                  Witter Funds.
New York, New York
Barry Fink (43) ......................................  Senior Vice President (since March, 1997), Secretary and
Vice President, Secretary                               General Counsel (since February, 1997) and Director (since
 and General Counsel                                    July, 1998) of MSDW Advisors and MSDW Services; Senior
Two World Trade Center                                  Vice President (since March, 1997) and Assistant Secretary
New York, New York                                      and Assistant General Counsel (since February, 1997) of
                                                        MSDW Distributors; Assistant Secretary of DWR (since Au-
                                                        gust, 1996); Vice President, Secretary and General Counsel
                                                        of the Morgan Stanley Dean Witter Funds and the TCW/DW
                                                        Funds (since February, 1997); previously First Vice
                                                        President (June, 1993-February, 1997), Vice President
                                                        (until June, 1993) and Assistant Secretary and Assistant
                                                        General Counsel of MSDW Advisors and MSDW Services and
                                                        Assistant Secretary of the Morgan Stanley Dean Witter
                                                        Funds and the TCW/DW Funds.
Thomas F. Caloia (52) ................................  First Vice President and Assistant Treasurer of MSDW
Treasurer                                               Advisors and MSDW Services; Treasurer of the Morgan
Two World Trade Center                                  Stanley Dean Witter Funds and the TCW/DW Funds.
New York, New York
</TABLE>
 
- ------------
* Denotes Trustees who are "interested persons" of the Fund, as defined in the
  Act.
 
                                       9
<PAGE>
   
    In addition, Mitchell M. Merin, President and Chief Operating Officer of
Asset Management of MSDW, President, Chief Executive Officer and Director of
MSDW Advisors and MSDW Services, Chairman and Director of MSDW Distributors and
MSDW Trust, Executive Vice President and Director of DWR, and Director of
various MSDW subsidiaries, Robert M. Scanlan, President, Chief Operating Officer
and Director of MSDW Advisors and MSDW Services, Executive Vice President of
MSDW Distributors and MSDW Trust and Director of MSDW Trust, Ronald E. Robison,
Executive Vice President and Chief Administrative Officer of MSDW Advisors and
MSDW Services, Robert S. Giambrone, Senior Vice President of MSDW Advisors, MSDW
Services, MSDW Distributors and MSDW Trust and Director of MSDW Trust, and
Joseph McAlinden, Executive Vice President and Chief Investment Officer of MSDW
Advisors and Director of MSDW Trust and Rajesh Gupta, Jayne Stevlingson and Guy
G. Rutherford, Jr., Senior Vice Presidents of MSDW Advisors, are Vice Presidents
of the Fund. Marilyn K. Cranney and Carsten Otto, First Vice Presidents and
Assistant General Counsels of MSDW Advisors and MSDW Services, Frank
Bruttomesso, LouAnne D. McInnis and Ruth Rossi, Vice Presidents and Assistant
General Counsels of MSDW Advisors and MSDW Services, and Todd Lebo a Staff
Attorney with MSDW Advisors, are Assistant Secretaries of the Fund.
    
 
THE BOARD OF TRUSTEES, THE INDEPENDENT TRUSTEES, AND THE COMMITTEES
 
   
    The Board of Trustees consists of nine (9) trustees. These same individuals
also serve as directors or trustees for all of the Morgan Stanley Dean Witter
Funds, and are referred to in this section as Trustees. As of the date of this
Statement of Additional Information, there are a total of 85 Dean Witter Funds,
comprised of 121 portfolios. As of November 30, 1998, the Morgan Stanley Dean
Witter Funds had total net assets of approximately $112.8 billion and more than
six million shareholders.
    
 
    Seven Trustees (77% of the total number) have no affiliation or business
connection with MSDW Advisors or any of its affiliated persons and do not own
any stock or other securities issued by MSDW Advisor's parent company, MSDW.
These are the "disinterested" or "independent" Trustees. Four of the seven
independent Trustees are also Independent Trustees of the TCW/DW Funds.
 
    Law and regulation establish both general guidelines and specific duties for
the Independent Trustees. The Morgan Stanley Dean Witter Funds seek as
Independent Trustees individuals of distinction and experience in business and
finance, government service or academia; these are people whose advice and
counsel are in demand by others and for whom there is often competition. To
accept a position on the Funds' Boards, such individuals may reject other
attractive assignments because the Funds make substantial demands on their time.
Indeed, by serving on the Funds' Boards, certain Trustees who would otherwise be
qualified and in demand to serve on bank boards would be prohibited by law from
doing so.
 
    All of the Independent Trustees serve as members of the Audit Committee.
Three of them also serve as members of the Derivatives Committee. In addition,
two of the Trustees including one Independent Trustee, serve as members of the
Insurance Committee. During the calendar year ended December 31, 1997, the Audit
Committee, the Derivatives Committee and the Independent Trustees held a
combined total of seventeen meetings.
 
    The Independent Trustees are charged with recommending to the full Board
approval of management, advisory and administration contracts, Rule 12b-1 plans
and distribution and underwriting agreements; continually reviewing Fund
performance; checking on the pricing of portfolio securities, brokerage
commissions, transfer agent costs and performance, and trading among Funds in
the same complex; and approving fidelity bond and related insurance coverage and
allocations, as well as other matters that arise from time to time. The
Independent Trustees are required to select and nominate individuals to fill any
Independent Trustee vacancy on the Board of any Fund that has a Rule 12b-1 plan
of distribution. Most of the Morgan Stanley Dean Witter Funds have such a plan.
 
    The Audit Committee is charged with recommending to the full Board the
engagement or discharge of the Fund's independent accountants; directing
investigations into matters within the scope of the independent accountants'
duties, including the power to retain outside specialists; reviewing with the
independent accountants the audit plan and results of the auditing engagement;
approving professional
 
                                       10
<PAGE>
services provided by the independent accountants and other accounting firms
prior to the performance of such services; reviewing the independence of the
independent accountants; considering the range of audit and non-audit fees; and
reviewing the adequacy of the Fund's system of internal controls.
 
    The Board of each Fund has formed a Derivatives Committee to approve
parameters for and monitor the activities of the Fund with respect to derivative
investments, if any, made by the Fund.
 
    Finally, the Board of each Fund has formed an Insurance Committee to review
and monitor the insurance coverage maintained by the Fund.
 
   
ADVANTAGES OF HAVING SAME INDIVIDUALS AS INDEPENDENT TRUSTEES FOR ALL MORGAN
STANLEY DEAN WITTER FUNDS
    
 
    The Independent Trustees and the Funds' management believe that having the
same Independent Trustees for each of the Morgan Stanley Dean Witter Funds
avoids the duplication of effort that would arise from having different groups
of individuals serving as Independent Trustees for each of the Funds or even of
sub-groups of Funds. They believe that having the same individuals serve as
Independent Trustees of all the Funds tends to increase their knowledge and
expertise regarding matters which affect the Fund complex generally and enhances
their ability to negotiate on behalf of each Fund with the Fund's service
providers. This arrangement also precludes the possibility of separate groups of
Independent Trustees arriving at conflicting decisions regarding operations and
management of the Funds and avoids the cost and confusion that would likely
ensue. Finally, having the same Independent Trustees serve on all Fund Boards
enhances the ability of each Fund to obtain, at modest cost to each separate
Fund, the services of Independent Trustees, of the caliber, experience and
business acumen of the individuals who serve as Independent Trustees of the
Morgan Stanley Dean Witter Funds.
 
COMPENSATION OF INDEPENDENT TRUSTEES
 
    The Fund intends to pay each Independent Trustee an annual fee of $800 plus
a per meeting fee of $50 for meetings of the Board of Trustees, the Independent
Trustees or Committees of the Board of Trustees attended by the Trustee (the
Fund intends to pay the Chairman of the Audit Committee an annual fee of $750).
If a Board meeting and a meeting of the Independent Trustees or a Committee
meeting, or a meeting of the Independent Trustees and/or more than one Committee
meeting, take place on a single day, the Trustees are paid a single meeting fee
by the Fund. The Fund will also reimburse such Trustees for travel and other
out-of-pocket expenses incurred by them in connection with attending such
meetings. Trustees and officers of the Fund who are or have been employed by the
Investment Manager or an affiliated company will receive no compensation or
expense reimbursement from the Fund for their services as Trustee. Payments will
commence as of the time the Fund begins paying management fees, which, pursuant
to an undertaking by the Investment Manager, will be at such time as the Fund
has $50 million of net assets or six months from the date of commencement of the
Fund's operations, whichever occurs first. Mr. Haire currently serves as
Chairman of the Audit Committee.
 
    At such time as the Fund has been in operation, and has paid fees to the
Independent Trustees, for a full fiscal year, and assuming that during such
fiscal year the Fund holds the same number of meetings of the Board, the
Independent Trustees and the Committees as were held by the other Morgan Stanley
 
                                       11
<PAGE>
Dean Witter Funds during the calendar year ended December 31, 1997, it is
estimated that the compensation paid to each Independent Trustee during such
fiscal year will be the amount shown in the following table:
                         FUND COMPENSATION (ESTIMATED)
 
<TABLE>
<CAPTION>
                                                                   AGGREGATE
                                                                 COMPENSATION
NAME OF INDEPENDENT TRUSTEE                                      FROM THE FUND
- --------------------------------------------------------------  ---------------
<S>                                                             <C>
Michael Bozic.................................................      $1,600
Edwin J. Garn.................................................       1,600
John R. Haire.................................................       3,550
Wayne E. Hedien...............................................       1,600
Dr. Manuel H. Johnson.........................................       1,600
Michael E. Nugent.............................................       1,600
John L. Schroeder.............................................       1,600
</TABLE>
 
   
    The following table illustrates the compensation paid to the Fund's
Independent Trustees for the calendar year ended December 31, 1997 for services
to the 84 Morgan Stanley Dean Witter Funds and, in the case of Messrs. Haire,
Johnson, Nugent and Schroeder, the 14 TCW/DW Funds that were in operation at
December 31, 1997. Mister Haire serves as Chairman of the Audit Committee of
each Morgan Stanley Dean Witter Fund and each TCW/DW Fund, and, prior to June 1,
1998, also served as Chairman of the Independent Directors or Trustees of those
Funds. With respect to Messrs. Haire, Johnson, Nugent and Schroeder, the TCW/DW
Funds are included solely because of a limited exchange privilege between those
Funds and five Morgan Stanley Dean Witter Money Market Funds. Mr. Hedien's term
as Director or Trustee of each Morgan Stanley Dean Witter Fund commenced on
September 1, 1997.
    
 
    CASH COMPENSATION FROM MORGAN STANLEY DEAN WITTER FUNDS AND TCW/DW FUNDS
 
<TABLE>
<CAPTION>
                                                                   FOR SERVICE AS
                                                                    CHAIRMAN OF
                                                                   COMMITTEES OF     FOR SERVICE
                                                                    INDEPENDENT          AS          TOTAL CASH
                                                                     DIRECTORS/      CHAIRMAN OF    COMPENSATION
                               FOR SERVICE                          TRUSTEES AND    COMMITTEES OF   FOR SERVICES
                              AS DIRECTOR OR                           AUDIT         INDEPENDENT    TO 84 MORGAN
                               TRUSTEE AND       FOR SERVICE AS    COMMITTEES OF    TRUSTEES AND    STANLEY DEAN
                             COMMITTEE MEMBER     TRUSTEE AND            84             AUDIT          WITTER
                               OF 84 MORGAN     COMMITTEE MEMBER   MORGAN STANLEY   COMMITTEES OF     FUNDS AND
NAME OF                        STANLEY DEAN       OF 14 TCW/DW          DEAN          14 TCW/DW       14 TCW/DW
INDEPENDENT TRUSTEE            WITTER FUNDS          FUNDS          WITTER FUNDS        FUNDS           FUNDS
- ---------------------------  ----------------   ----------------   --------------   -------------   -------------
<S>                          <C>                <C>                <C>              <C>             <C>
Michael Bozic..............      $133,602           --                 --               --            $133,602
Edwin J. Garn..............       149,702           --                 --               --             149,702
John R. Haire..............       149,702           $73,725           $157,463        $ 25,350         406,240
Wayne E. Hedien............        39,010           --                 --               --              39,010
Dr. Manuel H. Johnson......       145,702            71,125            --               --             216,827
Michael E. Nugent..........       149,702            73,725            --               --             223,427
John L. Schroeder..........       149,702            73,725            --               --             223,427
</TABLE>
 
   
    As of the date of this Statement of Additional Information, 56 of the Morgan
Stanley Dean Witter Funds, not including the Fund, have adopted a retirement
program under which an Independent Trustee who retires after serving for at
least five years (or such lesser period as may be determined by the Board) as an
Independent Director or Trustee of any Morgan Stanley Dean Witter Fund that has
adopted the retirement program (each such Fund referred to as an "Adopting Fund"
and each such Trustee referred to as an "Eligible Trustee") is entitled to
retirement payments upon reaching the eligible retirement age (normally, after
attaining age 72). Annual payments are based upon length of service. Currently,
upon retirement, each Eligible Trustee is entitled to receive from the Adopting
Fund, commencing as of his or her retirement date and continuing for the
remainder of his or her life, an annual retirement benefit (the "Regular
Benefit") equal to 29.41% of his or her Eligible Compensation plus 0.4901667% of
such Eligible Compensation for each full month of service as an Independent
Director or Trustee of any Adopting
    
 
                                       12
<PAGE>
Fund in excess of five years up to a maximum of 58.82% after ten years of
service. The foregoing percentages may be changed by the Board.(1) "Eligible
Compensation" is one-fifth of the total compensation earned by such Eligible
Trustee for service to the Adopting Fund in the five year period prior to the
date of the Eligible Trustee's retirement. Benefits under the retirement program
are not secured or funded by the Adopting Funds.
 
    The following table illustrates the retirement benefits accrued to the
Fund's Independent Trustees by the 57 Morgan Stanley Dean Witter Funds (not
including the Fund) for the year ended December 31, 1997, and the estimated
retirement benefits for the Fund's Independent Trustees, to commence upon their
retirement, from the 57 Morgan Stanley Dean Witter Funds as of December 31,
1997.
 
         RETIREMENT BENEFITS FROM ALL MORGAN STANLEY DEAN WITTER FUNDS
 
<TABLE>
<CAPTION>
                                                                                         ESTIMATED
                                                                                          ANNUAL
                                                                         RETIREMENT      BENEFITS
                                       ESTIMATED                          BENEFITS         UPON
                                     CREDITED YEARS     ESTIMATED        ACCRUED AS     RETIREMENT
                                     OF SERVICE AT    PERCENTAGE OF       EXPENSES       FROM ALL
                                       RETIREMENT        ELIGIBLE          BY ALL        ADOPTING
NAME OF INDEPENDENT TRUSTEE           (MAXIMUM 10)     COMPENSATION    ADOPTING FUNDS    FUNDS(2)
- -----------------------------------  --------------   --------------   --------------   -----------
<S>                                  <C>              <C>              <C>              <C>
Michael Bozic......................         10             58.82%      $   20,499         $ 55,026
Edwin J. Garn......................         10             58.82           30,878           55,026
John R. Haire......................         10             58.82          (19,823)(3)      132,002
Wayne E. Hedien....................          9              50.0                0           46,772
Dr. Manuel H. Johnson..............         10             58.82           12,832           55,026
Michael E. Nugent..................         10             58.82           22,546           55,026
John L. Schroeder..................          8             49.02           39,350           46,123
</TABLE>
 
- ------------
(1)  An Eligible Trustee may elect alternate payments of his or her retirement
     benefits based upon the combined life expectancy of such Eligible Trustee
     and his or her spouse on the date of such Eligible Trustee's retirement.
     The amount estimated to be payable under this method, through the remainder
     of the later of the lives of such Eligible Trustee and spouse, will be the
     actuarial equivalent of the Regular Benefit. In addition, the Eligible
     Trustee may elect that the surviving spouse's periodic payment of benefits
     will be equal to either 50% or 100% of the previous periodic amount, an
     election that, respectively, increases or decreases the previous periodic
     amount so that the resulting payments will be the actuarial equivalent of
     the Regular Benefit.
 
(2)  Based on current levels of compensation. Amount of annual benefits also
     varies depending on the Trustee's elections described in Footnote (1)
     above.
 
(3)  This number reflects the effect of the extension of Mr. Haire's term as
     Director or Trustee until May 1, 1999.
 
    As of the date of this Statement of Additional Information, the aggregate
number of shares of beneficial interest of the Fund owned by the Fund's officers
and Trustees as a group was less than 1 percent of the Fund's shares of
beneficial interest outstanding.
 
INVESTMENT PRACTICES AND POLICIES
- --------------------------------------------------------------------------------
 
    A description of the various investment practices and techniques in which
the Fund may engage is set forth below as well as in the Prospectus.
Shareholders are referred to the Prospectus of the Fund for more detailed
information.
 
    REPURCHASE AGREEMENTS.  As discussed in the Prospectus, when cash may be
available for only a few days, it may be invested by the Fund in repurchase
agreements until such time as it may otherwise be invested or used for payments
of obligations of the Fund. These agreements, which may be viewed as a type of
secured lending by the Fund, 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 ("collateral") at a specified price and at a fixed time in
the future, usually not more than seven days from the date of purchase. The
collateral will be maintained in a segregated account
 
                                       13
<PAGE>
and will be marked to market daily to determine that the value of the
collateral, as specified in the agreement, does not decrease below the purchase
price plus accrued interest. If such decrease occurs, additional collateral will
be requested and, when received, added to the account to maintain full
collateralization. The Fund will accrue interest from the institution until the
time when the repurchase is to occur. Although such date is deemed by the fund
to be the maturity date of a repurchase agreement, the maturities of securities
subject to repurchase agreements are not subject to any limits.
 
    While repurchase agreements involve certain risks not associated with direct
investments in debt securities, the Fund follows procedures designed to minimize
such risks. These procedures include effecting repurchase transactions only with
large, well-capitalized and well-established financial institutions whose
financial condition will be continually monitored by the Investment Manager
subject to procedures established by the Board of Trustees of the fund. In
addition, as described above, the value of the collateral underlying the
repurchase agreement will be at least equal to the repurchase price, including
any accrued interest earned on the repurchase agreement. In the event of a
default or bankruptcy by a selling financial institution, the Fund will seek to
liquidate such collateral. However, the exercising of the Fund's right to
liquidate such collateral could involve certain costs or delays and, to the
extent that proceeds from any sale upon a default of the obligation to
repurchase were less than the repurchase price, the Fund could suffer a loss. 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 its net assets.
The Fund's investments in repurchase agreements may at times be substantial
when, in the view of the Investment Manager, liquidity, tax or other
considerations warrant.
 
    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 notice provisions described below), and are at all times
secured by cash or cash equivalents, 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. The advantage of such
loans is that the Fund continues to receive the income on the loaned securities
while at the same time earning interest on the cash amounts deposited as
collateral, which will be invested in short-term obligations. The Fund will not
lend its portfolio securities if such loans are not permitted by the laws or
regulations of any state in which its shares are qualified for sale and will not
lend more than 25% of the value of its total assets. A loan may be terminated by
the borrower on one business days' notice, or by the fund on four business days'
notice. If the borrower fails to deliver the loaned securities within four days
after receipt of notice, the Fund could use the collateral to replace the
securities while holding the borrower liable for any excess of replacement cost
over collateral. 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, these loans of portfolio
securities will only be made to firms deemed by the Fund's management to be
creditworthy and when the income which can be earned from such loans justifies
the attendant risks. Upon termination of the loan, the borrower is required to
return the securities to the Fund. Any gain or loss in the market price during
the loan period would inure to the Fund. The creditworthiness of firms to which
the Fund lends its portfolio securities will be monitored on an ongoing basis by
the Investment Manager pursuant to procedures adopted and reviewed, on an
ongoing basis, by the Board of Trustees of the Fund.
 
    When voting or consent rights which accompany loaned securities pass to the
borrower, the Fund will follow the policy of calling the loaned securities, to
be delivered within one day after notice, to permit the exercise of such rights
if the matters involved would have a material effect on the fund's investment in
such loaned securities. The Fund will pay reasonable finder's, administrative
and custodial fees in connection with a loan of its securities.
 
    PRIVATE PLACEMENTS.  As discussed in the Prospectus, 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 of the
Securities Act, and determined to
 
                                       14
<PAGE>
be liquid pursuant to the procedures discussed in the following paragraph, are
not subject to the foregoing restriction.) Limitations on the resale of such
securities may have an adverse effect on their marketability, and may prevent
the 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 ("SEC") has adopted Rule 144A under
the Securities Act, which permits the 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. The procedures require that the following factors be taken into account in
making a liquidity determination: (1) the frequency of trades and price quotes
for the security; (2) the number of dealers and other potential purchasers who
have issued quotes on the security; (3) any dealer undertakings to make a market
in the security; and (4) the nature of the security and the nature of the
marketplace trades (the time needed to dispose of the security, the method of
soliciting offers, and the mechanics of transfer). If a restricted security is
determined to be "liquid," such security will not be included within the
category "illiquid securities," which under current policies may not exceed 15%
of the Fund's net assets.
    
 
    The Rule 144A marketplace of sellers and qualified institutional buyers is
new and still developing and may take a period of time to develop into a mature
liquid market. As such, the market for certain private placements purchased
pursuant to Rule 144A may be initially small or may, subsequent to purchase,
become illiquid. Furthermore, the Investment Manager may not posses all the
information concerning an issue of securities that it wishes to purchase in a
private placement to which it would normally have had access, had the
registration statement necessitated by a public offering been filed with the
Securities and Exchange Commission.
 
    RIGHTS AND WARRANTS.  As stated in the Prospectus, the Fund may acquire
rights and 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. Warrants are, in effect, an option 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.
 
    CONVERTIBLE SECURITIES.  The Fund may invest in fixed-income securities
which are convertible into common stock. 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).
 
    To the extent that a convertible security's investment value is greater than
its conversion value, its price will be primarily a reflection of such
investment value and its price will be likely to increase when interest rates
fall and decrease when interest rates rise, as with a fixed-income security (the
credit standing of the issuer and other factors may also have an effect on the
convertible security's value). If the conversion value exceeds the investment
value, the price of the convertible security will rise above its investment
value and, in addition, will sell at some premium over its conversion value.
(This premium represents the price investors are willing to pay for the
privilege of purchasing a fixed-income security with a possibility of capital
appreciation due to the conversion privilege). At such times the price of the
convertible security will tend to fluctuate directly with the price of the
underlying equity security. Convertible securities may be purchased by the Fund
at varying price levels above their investment values and/or their conversion
values in keeping with the Fund's objective.
 
                                       15
<PAGE>
    U.S. GOVERNMENT SECURITIES.  Securities issued by the U.S. Government, its
agencies or instrumentalities in which the Fund may invest include:
 
        (1) U.S. Treasury bills (maturities of one year or less), U.S. Treasury
    notes (maturities of one to ten years) and U.S. Treasury bonds (generally
    maturities of greater than ten years), all of which are direct obligations
    of the U.S. Government and, as such, are backed by the "full faith and
    credit" of the United States.
 
        (2) Securities issued by agencies and instrumentalities of the U.S.
    Government which are backed by the full faith and credit of the United
    States. Among the agencies and instrumentalities issuing such obligations
    are the Federal Housing Administration, the Government National Mortgage
    Association ("GNMA"), the Department of Housing and Urban Development, the
    Export-Import Bank, the Farmers Home Administration, the General Services
    Administration, the Maritime Administration and the Small Business
    Administration. The maturities of such obligations range from three months
    to 30 years.
 
    Neither the value nor the yield of the U.S. Government securities which may
be invested in by the Fund are guaranteed by the U.S. Government. Such values
and yield will fluctuate with changes in prevailing interest rates and other
factors. Generally, as prevailing interest rates rise, the value of any U.S.
Government securities held by the Fund will fall. Such securities with longer
maturities generally tend to produce higher yields and are subject to greater
market fluctuation as a result of changes in interest rates than debt securities
with shorter maturities.
 
    ZERO COUPON TREASURY SECURITIES.  A portion of the U.S. Government
securities purchased by the Fund may be "zero coupon" Treasury securities. These
are U.S. Treasury bills, notes and bonds which have been stripped of their
unmatured interest coupons and receipts or which are certificates representing
interests in such stripped debt obligations and coupons. Such securities are
purchased at a discount from their face amount, giving the purchaser the right
to receive their full value at maturity. A zero coupon security pays no interest
to its holder during its life. Its value to an investor consists of the
difference between its face value at the time of maturity and the price for
which it was acquired, which is generally an amount significantly less than its
face value (sometimes referred to as a "deep discount" price). The Fund intends
to invest in such zero coupon treasury securities as STRIPS, Treasury Receipts,
Physical Coupons, and Proprietary Receipts.
 
    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 if
prevailing interest rates rise. For this reason, zero coupon securities are
subject to substantially greater market price fluctuations during periods of
changing prevailing interest rates than are comparable debt securities which
make current distributions of interest. 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.
 
    Currently the only U.S. Treasury security issued without coupons is the
Treasury bill. However, in the last few years a number of banks and brokerage
firms have separated ("stripped") the principal portions from the coupon
portions of the U.S. Treasury bonds and notes and sold them separately in the
form of receipts or certificates representing undivided interests in these
instruments (which instruments are generally held by a bank in a custodial or
trust account).
 
                                       16
<PAGE>
    As stated in the Prospectus, the money market instruments which the Fund may
purchase include U.S. Government securities, bank obligations, Eurodollar
certificates of deposit, obligations of savings institutions, fully insured
certificates of deposit and commercial paper. Such securities are limited to:
 
    U.S. GOVERNMENT SECURITIES.  Obligations issued or guaranteed as to
principal and interest by the United States or its agencies (such as the
Export-Import Bank of the United States, Federal Housing Administration and
Government National Mortgage Association) or its instrumentalities (such as the
Federal Home Loan Bank), including Treasury bills, notes and bonds;
 
    BANK OBLIGATIONS.  Obligations (including certificates of deposit and
bankers' acceptances) of banks subject to regulation by the U.S. Government and
having total assets of $1,000,000,000 or more, and instruments secured by such
obligations, not including obligations of foreign branches of domestic banks
except to the extent below;
 
    EURODOLLAR CERTIFICATES OF DEPOSIT.  Eurodollar certificates of deposit
issued by foreign branches of domestic banks having total assets of
$1,000,000,000 or more;
 
    OBLIGATIONS OF SAVINGS INSTITUTIONS.  Certificates of deposit of savings
banks and savings and loan associations, having total assets of $1,000,000,000
or more;
 
    FULLY INSURED CERTIFICATES OF DEPOSIT.  Certificates of deposit of banks and
savings institutions, having total assets of less than $1,000,000,000 if the
principal amount of the obligation is insured by the Federal Deposit Insurance
Corporation, limited to $100,000 principal amount per certificate and to 15% or
less of the Fund's total assets in all such obligations and in all illiquid
assets, in the aggregate;
 
    COMMERCIAL PAPER.  Commercial paper rated within the two highest grades by
Standard & Poor's ("S&P") or the highest grade by Moody's Investors Service Inc.
("Moody's") 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.
 
FORWARD FOREIGN CURRENCY EXCHANGE CONTRACTS
 
    As discussed in the Prospectus, the Fund may enter into forward foreign
currency exchange contracts ("forward contracts") as a hedge against
fluctuations in future foreign exchange rates. The Fund will conduct its foreign
currency exchange transactions either on a spot (i.e., cash) basis at the spot
rate prevailing in the foreign currency exchange market, or through entering
into forward contracts to purchase or sell foreign currencies. A forward
contract involves an obligation to purchase or sell a specific 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. These
contracts are traded in the interbank market conducted directly between currency
traders (usually large commercial banks and investment banks) and their
customers. Such forward contracts will only be entered into with United States
banks and their foreign branches or foreign banks whose assets total $1 billion
or more. A forward contract generally has no deposit requirement, and no
commissions are charged at any stage for trades.
 
    When management of the Fund believes that a particular foreign currency may
suffer a substantial movement against the U.S. dollar, it may enter into a
forward contract to purchase or 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 denominated in such foreign currency. The
Fund will also not enter into such forward contracts or maintain a net exposure
to such contracts where the consummation of the contracts would obligate the
Fund to deliver an amount of foreign currency in excess of the value of the
Fund's portfolio securities or other assets denominated in that currency. Under
normal circumstances, consideration of the prospect for currency parities will
be incorporated in the longer term investment decisions made with regard to
overall diversification strategies. However, the management of the Fund believes
that it is important to have the flexibility to enter into such forward
contracts when it determines that the best interests of the Fund will be served.
The Fund's custodian bank will place cash, U.S. Government securities or other
appropriate liquid portfolio securities in a segregated account of the Fund in
an amount equal to the value of the Fund's total assets committed to the
consummation of forward contracts entered into under the circumstances set forth
above. If the value of the securities
 
                                       17
<PAGE>
placed in the segregated account declines, additional cash or securities will be
placed in the account on a daily basis so that the value of the account will
equal the amount of the Fund's commitments with respect to such contracts.
 
    Where, for example, the Fund is hedging a portfolio position consisting of
foreign fixed-income securities denominated in a foreign currency against
adverse exchange rate moves vis-a-vis the U.S. dollar, at the maturity of the
forward contract for delivery by the Fund of a foreign currency, the Fund may
either sell the portfolio security and make delivery of the foreign currency, or
it may retain the security and terminate its contractual obligation to deliver
the foreign currency by purchasing an "offsetting" contract with the same
currency trader obligating it to purchase, on the same maturity date, the same
amount of the foreign currency. It is impossible to forecast the market value of
portfolio securities at the expiration of the contract. Accordingly, it may be
necessary for the Fund to purchase additional foreign currency on the spot
market (and bear the expense of such purchase) if the market value of the
security is less than the amount of foreign currency the Fund is obligated to
deliver and if a decision is made to sell the security and make delivery of the
foreign currency. Conversely, it may be necessary to sell on the spot market
some of the foreign currency received upon the sale of the portfolio securities
if its market value exceeds the amount of foreign currency the Fund is obligated
to deliver.
 
    If the Fund retains the portfolio securities and engages in an offsetting
transaction, the Fund will incur a gain or loss to the extent that there has
been movement in spot or forward contract prices. If the Fund engages in an
offsetting transaction, it may subsequently enter into a new forward contract to
sell the foreign currency. Should forward prices decline during the period
between the Fund's entering into a forward contract for the sale of a foreign
currency and the date it enters into an offsetting contract for the purchase of
the foreign currency, the Fund will realize a gain to the extent the price of
the currency it has agreed to sell exceeds the price of the currency it has
agreed to purchase. Should forward prices increase, the Fund will suffer a loss
to the extent the price of the currency it has agreed to purchase exceeds the
price of the currency it has agreed to sell.
 
    If the Fund purchases a fixed-income security which is denominated in U.S.
dollars but which will pay out its principal based upon a formula tied to the
exchange rate between the U.S. dollar and a foreign currency, it may hedge
against a decline in the principal value of the security by entering into a
forward contract to sell an amount of the relevant foreign currency equal to
some or all of the principal value of the security.
 
    At times when the Fund has written a call option on a fixed-income security
or the currency in which it is denominated, it may wish to enter into a forward
contract to purchase or sell the foreign currency in which the security is
denominated. A forward contract would, for example, hedge the risk of the
security on which a call option has been written declining in value to a greater
extent than the value of the premium received for the option. The Fund will
maintain with its Custodian at all times cash, U.S. Government securities and
liquid portfolio securities in a segregated account equal in value to all
forward contract obligations and option contract obligations entered into in
hedge situations such as this.
 
    Although the Fund values its assets daily in terms of U.S. dollars, it does
not intend to convert its holdings of foreign currencies into U.S. dollars on a
daily basis. It will, however, do so from time to time, and investors should be
aware of the costs of currency conversion. Although foreign exchange dealers do
not charge a fee for conversion, they do realize a profit based on the spread
between the prices at which they are buying and selling various currencies.
Thus, a dealer may offer to sell a foreign currency to the Fund at one rate,
while offering a lesser rate of exchange should the Fund desire to resell that
currency to the dealer.
 
    OPTIONS AND FUTURES TRANSACTIONS  As stated in the Prospectus, the Fund may
write covered call options against securities held in its portfolio and covered
put options on eligible portfolio securities and stock indexes and purchase
options of the same series to effect closing transactions, and may hedge against
potential changes in the market value of investments (or anticipated
investments) and facilitate the reallocation of a fund's assets into and out of
equities and fixed-income securities by purchasing put
 
                                       18
<PAGE>
and call options on portfolio (or eligible portfolio) securities and engaging in
transactions involving futures contracts and options on such contracts. The Fund
may also hedge against potential changes in the market value of the currencies
in which its investments (or anticipated investments) are denominated by
purchasing put and call options on currencies and engage in transactions
involving currency futures contracts and options on such contracts.
 
    Call and put options on U.S. Treasury notes, bonds and bills and equity
securities are listed on Exchanges and are written in over-the-counter
transactions ("OTC options"). Listed options are issued by the Options Clearing
Corporation ("OCC") and other clearing entities including foreign exchanges.
Ownership of a listed call option gives the Fund the right to buy from the OCC
the underlying security covered by the option at the stated exercise price (the
price per unit of the underlying security) by filing an exercise notice prior to
the expiration date of the option. The writer (seller) of the option would then
have the obligation to sell to the OCC the underlying security at that exercise
price prior to the expiration date of the option, regardless of its then current
market price. Ownership of a listed put option would give the Fund the right to
sell the underlying security to the OCC at the stated exercise price. Upon
notice of exercise of the put option, the writer of the put would have the
obligation to purchase the underlying security from the OCC at the exercise
price.
 
    OPTIONS ON TREASURY BONDS AND NOTES.  Because trading in options written on
Treasury bonds and notes tends to center on the most recently auctioned issues,
the exchanges on which such securities trade will not continue indefinitely to
introduce options with new expirations to replace expiring options on particular
issues. Instead, the expirations introduced at the commencement of options
trading on a particular issue will be allowed to run their course, with the
possible addition of a limited number of new expirations as the original ones
expire. Options trading on each issue of bonds or notes will thus be phased out
as new options are listed on more recent issues, and options representing a full
range of expirations will not ordinarily be available for every issue on which
options are traded.
 
    OPTIONS ON TREASURY BILLS.  Because a deliverable Treasury bill changes from
week to week, writers of Treasury bill calls cannot provide in advance for their
potential exercise settlement obligations by acquiring and holding the
underlying security. However, if the Fund holds a long position in Treasury
bills with a principal amount of the securities deliverable upon exercise of the
option, the position may be hedged from a risk standpoint by the writing of a
call option. For so long as the call option is outstanding, the Fund will hold
the Treasury bills in a segregated account with its Custodian, so that they will
be treated as being covered.
 
    OTC OPTIONS.  Exchange-listed options are issued by the OCC which assures
that all transactions in such options are properly executed. OTC options are
purchased from or sold (written) to dealers or financial institutions which have
entered into direct agreements with the Fund. With OTC options, such variables
as expiration date, exercise price and premium will be agreed upon between the
Fund and the transacting dealer, without the intermediation of a third party
such as the OCC. If the transacting dealer fails to make or take delivery of the
securities underlying an option it has written, in accordance with the terms of
that option, the Fund would lose the premium paid for the option as well as any
anticipated benefit of the transaction. The Fund will engage in OTC option
transactions only with primary U.S. Government securities dealers recognized by
the Federal Reserve Bank of New York.
 
    COVERED CALL WRITING.  The Fund is permitted to write covered call options
on portfolio securities and the U.S. dollar and foreign currencies, without
limit. Generally, a call option is "covered" if the Fund owns, or has the right
to acquire, without additional cash consideration (or for additional cash
consideration held for the Fund by its Custodian in a segregated account) the
underlying security (currency) subject to the option except that in the case of
call options on U.S. Treasury Bills, a fund might own U.S. Treasury Bills of a
different series from those underlying the call option, but with a principal
amount and value corresponding to the exercise price and a maturity date no
later than that of the securities (currency) deliverable under the call option.
A call option is also covered if the Fund holds a call on the same security
(currency) as the underlying security (currency) of the written option, where
the exercise price of the call used for coverage is equal to or less than the
exercise price of the call written or greater
 
                                       19
<PAGE>
than the exercise price of the call written if the mark to market difference is
maintained by the Fund in cash, U.S. Government securities or other liquid
portfolio securities which the fund holds in a segregated account maintained
with its Custodian.
 
    The Fund will receive from the purchaser, in return for a call it has
written, a "premium"; i.e., the price of the option. Receipt of these premiums
may better enable the Fund to achieve a greater total return than would be
realized from holding the underlying securities (currency) alone. Moreover, the
income received from the premium will offset a portion of the potential loss
incurred by the fund if the securities (currency) underlying the option are
ultimately sold (exchanged) by the Fund at a loss. The premium received will
fluctuate with varying economic market conditions. If the market value of the
portfolio securities (or the currencies in which they are denominated) upon
which call options have been written increases, the Fund may receive less total
return from the portion of its portfolio upon which calls have been written than
it would have had such calls not been written.
 
    As regards listed options and certain OTC options, during the option period,
the Fund may be required, at any time, to deliver the underlying security
(currency) against payment of the exercise price on any calls it has written
(exercise of certain listed and OTC options may be limited to specific
expiration dates). This obligation is terminated upon the expiration of the
option period or at such earlier time when the writer effects a closing purchase
transaction. A closing purchase transaction is accomplished by purchasing an
option of the same series as the option previously written. However, once the
Fund has been assigned an exercise notice, it will be unable to effect a closing
purchase transaction.
 
    Closing purchase transactions are ordinarily effected to realize a profit on
an outstanding call option to prevent an underlying security (currency) from
being called, to permit the sale of an underlying security (or the exchange of
the underlying currency) or to enable the Fund to write another call option on
the underlying security (currency) with either a different exercise price or
expiration date or both. Also, effecting a closing purchase transaction will
permit the cash or proceeds from the concurrent sale of any securities subject
to the option to be used for other investments by the Fund. The Fund may realize
a net gain or loss from a closing purchase transaction depending upon whether
the amount of the premium received on the call option is more or less than the
cost of effecting the closing purchase transaction. Any loss incurred in a
closing purchase transaction may be wholly or partially offset by unrealized
appreciation in the market value of the underlying security (currency).
Conversely, a gain resulting from a closing purchase transaction could be offset
in whole or in part or exceeded by a decline in the market value of the
underlying security (currency).
 
    If a call option expires unexercised, the Fund realizes a gain in the amount
of the premium on the option less the commission paid. Such a gain, however, may
be offset by depreciation in the market value of the underlying security
(currency) during the option period. If a call option is exercised, the Fund
realizes a gain or loss from the sale of the underlying security (currency)
equal to the difference between the purchase price of the underlying security
(currency) and the proceeds of the sale of the security (currency) plus the
premium received for on the option less the commission paid.
 
    Options written by the Fund normally have expiration dates of from up to
nine months (equity securities) to eighteen months (fixed-income securities)
from the date written. The exercise price of a call option may be below, equal
to or above the current market value of the underlying security (currency) at
the time the option is written. See "Risks of Options and Futures Transactions,"
below.
 
    COVERED PUT WRITING.  As a writer of a covered put option, the Fund incurs
an obligation to buy the security 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 (certain listed and OTC put options written by the Fund
will be exercisable by the purchaser only on a specific date). A put is
"covered" if, at all times, the Fund maintains, in a segregated account
maintained on its behalf at the Fund's Custodian, cash, U.S. Government
securities or other high grade obligations in an amount equal to at least the
exercise price of the option, at all times during the option period. Similarly,
a short put position could be covered by the Fund by its purchase of a put
option on the same security as the underlying security of the written option,
where the exercise price of the purchased option is equal to or more than the
exercise price of the put
 
                                       20
<PAGE>
written or less than the exercise price of the put written if the mark to market
difference is maintained by the Fund in cash, U.S. Government securities or
other liquid portfolio securities which the Fund holds in a segregated account
maintained at its Custodian. In writing puts, the Fund assumes the risk of loss
should the market value of the underlying security decline below the exercise
price of the option (any loss being decreased by the receipt of the premium on
the option written). In the case of listed options, during the option period,
the Fund may be required, at any time, to make payment of the exercise price
against delivery of the underlying security. The operation of and limitations on
covered put options in other respects are substantially identical to those of
call options.
 
    The Fund will write put options for two purposes: (1) to receive the income
derived from the premiums paid by purchasers; and (2) when the Investment
Manager wishes to purchase the security underlying the option at a price lower
than its current market price, in which case it will write the covered put at an
exercise price reflecting the lower purchase price sought. The potential gain on
a covered put option is limited to the premium received on the option (less the
commissions paid on the transaction) while the potential loss equals the
difference between the exercise price of the option and the current market price
of the underlying securities when the put is exercised, offset by the premium
received (less the commissions paid on the transaction).
 
    PURCHASING CALL AND PUT OPTIONS.  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 in order to close out a covered call position (see
"Covered Call Writing" above) or purchase call options on securities they intend
to purchase. The Fund may also purchase a call option on foreign currency to
hedge against an adverse exchange rate move 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 purchase of the call option to
effect a closing transaction or a call written over-the-counter may be a listed
or an OTC option. In either case, the call purchased is likely to be on the same
securities (currencies) and have the same terms as the written option. If
purchased over-the-counter, the option would generally be acquired from the
dealer or financial institution which purchased the call written by the Fund.
 
    The Fund may purchase put options on securities (currency) which it holds
(or has the right to acquire) in its portfolio only to protect itself against a
decline in the value of the security (currency). If the value of the underlying
security (currency) were to fall below the exercise price of the put purchased
in an amount greater than the premium paid for the option, the Fund would incur
no additional loss. The Fund may also purchase put options to close out written
put positions in a manner similar to call options closing purchase transactions.
In addition, the Fund may sell a put option which it has previously purchased
prior to the sale of the securities (currency) underlying such option. Such a
sale would result in a net gain or loss depending on whether the amount received
on the sale is more or less than the premium and other transaction costs paid on
the put option which is sold. Any such gain or loss could be offset in whole or
in part by a change in the market value of the underlying security (currency).
If a put option purchased by the Fund expired without being sold or exercised,
the premium would be lost.
 
    RISKS OF OPTIONS TRANSACTIONS.  During the option period, the covered call
writer has, in return for the premium on the option, given up the opportunity
for capital appreciation above the exercise price should the market price of the
underlying security (or the currency in which it is denominated) increase, but
has retained the risk of loss should the price of the underlying security
(currency) decline. The covered put writer also retains the risk of loss should
the market value of the underlying security (currency) decline below the
exercise price of the option less the premium received on the sale of the
option. In both cases, the writer has no control over the time when it may be
required to fulfill its obligation as a writer of the option. Once an option
writer has received an exercise notice, it cannot effect a closing purchase
transaction in order to terminate its obligation under the option and must
deliver or receive the underlying securities (currency) at the exercise price.
 
    Prior to exercise or expiration, an option position can only be terminated
by entering into a closing purchase or sale transaction. If a covered call
option writer is unable to effect a closing purchase transaction or to purchase
an offsetting over-the-counter option, it cannot sell the underlying security
 
                                       21
<PAGE>
until the option expires or the option is exercised. Accordingly, a covered call
option writer may not be able to sell (exchange) an underlying security
(currency) at a time when it might otherwise be advantageous to do so. A covered
put option writer who is unable to effect a closing purchase transaction or to
purchase an offsetting over-the-counter option would continue to bear the risk
of decline in the market price of the underlying security (currency) until the
option expires or is exercised. In addition, a coveredput writer would be unable
to utilize the amount held in cash or U.S. Government or other liquid portfolio
securities as security for the put option for other investment purposes until
the exercise or expiration of the option.
 
    The Fund's ability to close out its position as a writer of an option is
dependent upon the existence of a liquid secondary market on option Exchanges.
There is no assurance that such a market will exist, particularly in the case of
OTC options, as such options will generally only be closed out by entering into
a closing purchase transaction with the purchasing dealer. However, the Fund may
be able to purchase an offsetting option which does not close out its position
as a writer but constitutes an asset of equal value to the obligation under the
option written. If the Fund is not able to either enter into a closing purchase
transaction or purchase an offsetting position, it will be required to maintain
the securities subject to the call, or the collateral underlying the put, even
though it might not be advantageous to do so, until a closing transaction can be
entered into (or the option is exercised or expires).
 
    Among the possible reasons for the absence of a liquid secondary market on
an Exchange are: (i) insufficient trading interest in certain options; (ii)
restrictions on transactions imposed by an Exchange; (iii) trading halts,
suspensions or other restrictions imposed with respect to particular classes or
series of options or underlying securities; (iv) interruption of the normal
operations on an Exchange; (v) inadequacy of the facilities of an Exchange or
the Options Clearing Corporation ("OCC") to handle current trading volume; or
(vi) a decision by one or more Exchanges to discontinue the trading of options
(or a particular class or series of options), in which event the secondary
market on that Exchange (or in that class or series of options) would cease to
exist, although outstanding options on that Exchange that had been issued by the
OCC as a result of trades on that Exchange would generally continue to be
exercisable in accordance with their terms.
 
    Exchanges limit the amount by which the price of a futures contract 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. In the event of adverse price movements, a fund would continue to
be required to make daily cash payments of variation margin on open futures
positions. In such situations, if the Fund has insufficient cash, it may have to
sell portfolio securities to meet daily variation margin requirements at a time
when it may be disadvantageous to do so. In addition, the Fund may be required
to take or make delivery of the instruments underlying interest rate futures
contracts it holds at a time when it is disadvantageous to do so. The inability
to close out options and futures positions could also have an adverse impact on
the Fund's ability to effectively hedge its portfolio.
 
    In the event of the bankruptcy of a broker through which the Fund engages in
transactions in options, futures or options thereon, the Fund could experience
delays and/or losses in liquidating open positions purchased or sold through the
broker and/or incur a loss of all or part of its margin deposits with the
broker. Similarly, in the event of the bankruptcy of the writer of an OTC option
purchased by the Fund, the Fund could experience a loss of all or part of the
value of the option. Transactions are entered into by the Fund only with brokers
or financial institutions deemed creditworthy by the Investment Manager.
 
    Each of the Exchanges has established limitations governing the maximum
number of call or put options on the same underlying security or futures
contract (whether or not covered) which may be written by a single investor,
whether acting alone or in concert with others (regardless of whether such
options are written on the same or different Exchanges or are held or written on
one or more accounts or through one or more brokers). An Exchange may order the
liquidation of positions found to be in violation of these limits and it may
impose other sanctions or restrictions. These position limits may restrict the
number of listed options which a fund may write.
 
                                       22
<PAGE>
    While the futures contracts and options transactions to be engaged in by the
Fund for the purpose of hedging the Fund's portfolio securities are not
speculative in nature, there are risks inherent in the use of such instruments.
One such risk which may arise in employing futures contracts to protect against
the price volatility of portfolio securities is that the prices of securities
and indexes subject to futures contracts (and thereby the futures contract
prices) may correlate imperfectly with the behavior of the cash prices of the
Fund's portfolio securities. Another such risk is that prices of interest rate
futures contracts may not move in tandem with the changes in prevailing interest
rates against which the fund seeks a hedge. A correlation may also be distorted
by the fact that the futures market is dominated by short-term traders seeking
to profit from the difference between a contract or security price objective and
their cost of borrowed funds. Such distortions are generally minor and would
diminish as the contract approached maturity.
 
    The hours of trading for options may not conform to the hours during which
the underlying securities are traded. To the extent that the option markets
close before the markets for the underlying securities, significant price and
rate movements can take place in the underlying markets that cannot be reflected
in the option markets.
 
    STOCK INDEX OPTIONS.  Options on stock indexes are similar to options on
stock except that, rather than the right to take or make delivery of stock at a
specified price, an option on a stock index gives the holder the right to
receive, upon exercise of the option, an amount of cash if the closing level of
the stock index upon which the option is based is greater than, in the case of a
call, or less than, in the case of a put, the exercise price of the option. This
amount of cash is equal to such difference between the closing price of the
index and the exercise price of the option expressed in dollars times a
specified multiple (the "multiplier"). The multiplier for an index option
performs a function similar to the unit of trading for a stock option. It
determines the total dollar value per contract of each point in the difference
between the exercise price of an option and the current level of the underlying
index. A multiplier of 100 means that a one-point difference will yield $100.
Options on different indexes may have different multipliers. The writer of the
option is obligated, in return for the premium received, to make delivery of
this amount. Unlike stock options, all settlements are in cash and a gain or
loss depends on price movements in the stock market generally (or in a
particular segment of the market) rather than the price movements in individual
stocks. Currently, options are traded on the Standard & Poor's 100 Index and the
Standard & Poor's 500 Index on the Chicago Board Options Exchange, the Major
Market Index and the Computer Technology Index, Oil Index and Institutional
Index on the American Stock Exchange and the NYSE Index and NYSE Beta Index on
the New York Stock Exchange, The Financial News Composite Index on the Pacific
Stock Exchange and the Value Line Index, National O-T-C Index and Utilities
Index on the Philadelphia Stock Exchange, each of which and any similar index on
which options are traded in the future which include stocks that are not limited
to any particular industry or segment of the market is referred to as a "broadly
based stock market index." Options on stock indexes provide a fund with a means
of protecting the Fund against the risk of market wide price movements. If the
Investment Manager anticipates a market decline, the Fund could purchase a stock
index put option. If the expected market decline materialized, the resulting
decrease win the value of the Fund's portfolio would be offset to the extent of
the increase in the value of the put option. If the Investment Manager
anticipates a market rise, the Fund may purchase a stock index call option to
enable the Fund to participate in such rise until completion of anticipated
common stock purchases by the fund. Purchases and sales of stock index options
also enable the Investment Manager to more speedily achieve changes in a fund's
equity positions.
 
    The Fund will write put options on stock indexes only if such positions are
covered by cash, U.S. Government securities or other liquid portfolio securities
equal to the aggregate exercise price of the puts, which cover is held for the
Fund in a segregated account maintained for it by the fund's Custodian. All call
options on stock indexes written by the Fund will be covered either by a
portfolio of stocks substantially replicating the movement of the index
underlying the call option or by holding a separate call option on the same
stock index with a strike price no higher than the strike price of the call
option sold by the fund.
 
                                       23
<PAGE>
    RISKS OF OPTIONS ON INDEXES.  Because exercises of stock index options are
settled in cash, call writers such as the Fund cannot provide in advance for
their potential settlement obligations by acquiring and holding the underlying
securities. A call writer can offset some of the risk of its writing position by
holding a diversified portfolio of stocks similar to those on which the
underlying index is based. However, most investors cannot, as a practical
matter, acquire and hold a portfolio containing exactly the same stocks as the
underlying index, and, as a result, bear a risk that the value of the securities
held will vary from the value of the index. Even if an index call writer could
assemble a stock portfolio that exactly reproduced the composition of the
underlying index, the writer still would not be fully covered from a risk
standpoint because of the "timing risk" inherent in writing index options. When
an index option is exercised, the amount of cash that the holder is entitled to
receive is determined by the difference between the exercise price and the
closing index level on the date when the option is exercised. As with other
kinds of options, the writer will not learn that it has been assigned until the
next business day, at the earliest. The time lag between exercise and notice of
assignment poses no risk for the writer of a covered call on a specific
underlying security, such as a common stock, because there the writer's
obligation is to deliver the underlying security, not to pay its value as of a
fixed time in the past. So long as the writer already owns the underlying
security, it can satisfy its settlement obligations by simply delivering it, and
the risk that its value may have declined since the exercise date is borne by
the exercising holder. In contrast, even if the writer of an index call holds
stocks that exactly match the composition of the underlying index, it will not
be able to satisfy its assignment obligations by delivering those stocks against
payment of the exercise price. Instead, it will be required to pay cash in an
amount based on the closing index value on the exercise date; and by the time it
learns that it has been assigned, the index may have declined, with a
corresponding decrease in the value of its stock portfolio. This "timing risk"
is an inherent limitation on the ability of index call writers to cover their
risk exposure by holding stock positions.
 
    A holder of an index option who exercises it before the closing index value
for that day is available runs the risk that the level of the underlying index
may subsequently change. If such a change causes the exercised option to fall
out-of-the-money, the exercising holder will be required to pay the difference
between the closing index value and the exercise price of the option (times the
applicable multiplier) to the assigned writer.
 
    If dissemination of the current level of an underlying index is interrupted,
or if trading is interrupted in stocks accounting for a substantial portion of
the value of an index, the trading of options on that index will ordinarily be
halted. If the trading of options on an underlying index is halted, an exchange
may impose restrictions prohibiting the exercise of such options.
 
    FUTURES CONTRACTS.  The Fund may purchase and sell interest rate, currency
and stock index futures contracts ("futures contracts") that are traded on U.S.
and foreign commodity exchanges on such underlying securities as U.S. Treasury
bonds, notes and bills ("interest rate" futures), on the U.S. dollar and foreign
currencies, and such indexes as the S&P 500 Index, the Moody's Investment-Grade
Corporate Bond Index and the New York Stock Exchange Composite Index ("index"
futures).
 
    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 Portfolio 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 will purchase or sell interest rate futures contracts and bond
index futures contracts for the purpose of hedging its fixed-income portfolio
(or anticipated portfolio) securities against changes in prevailing interest
rates. If the Investment Manager anticipates that interest rates may rise and,
concomitantly, the price of fixed-income securities fall, a fund may sell an
interest rate futures contract or a bond index futures contract. If declining
interest rates are anticipated, the Fund may purchase an interest rate futures
contract to protect against a potential increase in the price of U.S. Government
securities the
 
                                       24
<PAGE>
Fund intends to purchase. Subsequently, appropriate fixed-income securities may
be purchased by the Fund in an orderly fashion; as securities are purchased,
corresponding futures positions would be terminated by offsetting sales of
contracts.
 
    The Fund will purchase or sell futures contracts on the U.S. dollar and on
foreign currencies to hedge against an anticipated rise or decline in the value
of the U.S. dollar or foreign currency in which a portfolio security of the fund
is denominated vis-a-vis another currency.
 
    The Fund will purchase or sell stock index futures contracts for the purpose
of hedging its equity portfolio (or anticipated portfolio) securities against
changes in their prices. If the Investment Manager anticipates that the prices
of stock held by the Fund may fall, the Fund may sell a stock index futures
contract. Conversely, if the Investment Manager wishes to hedge against
anticipated price rises in those stocks which the Fund intends to purchase, the
Fund may purchase stock index futures contracts. In addition, interest rate and
stock index futures contracts will be bought or sold in order to close out a
short or long position in a corresponding futures contract.
 
    Although most interest rate futures contracts call for actual delivery or
acceptance of securities, the contracts usually are closed out before the
settlement date without the making or taking of delivery. Index futures
contracts provide for the delivery of an amount of cash equal to a specified
dollar amount times the difference between the stock index value at the open or
close of the last trading day of the contract and the futures contract price. A
futures contract sale is closed out by effecting a futures contract purchase for
the same aggregate amount of the specific type of equity security and the same
delivery date. If the sale price exceeds the offsetting purchase price, the
seller would be paid the difference and would realize a gain. If the offsetting
purchase price exceeds the sale price, the seller would pay the difference and
would realize a loss. Similarly, a futures contract purchase is closed out by
effecting a futures contract sale for the same aggregate amount of the specific
type of equity security and the same delivery date. If the offsetting sale price
exceeds the purchase price, the purchaser would realize a gain, whereas if the
purchase price exceeds the offsetting sale price, the purchaser would realize a
loss. There is no assurance that the Fund will be able to enter into a closing
transaction.
 
    INTEREST RATE FUTURES CONTRACTS.  When the Fund enters into an interest rate
futures contract, it is initially required to deposit with the Fund's Custodian,
in a segregated account in the name of the broker performing the transaction, an
"initial margin" of cash or U.S. Government securities or other liquid portfolio
securities equal to approximately 2% of the contract amount. Initial margin
requirements are established by the Exchanges on which futures contracts trade
and may, from time to time, change. In addition, brokers may establish margin
deposit requirements in excess of those required by the Exchanges.
 
    Initial margin in futures transactions is different from margin in
securities transactions in that initial margin does not involve the borrowing of
funds by a brokers' client but is, rather, a good faith deposit on the futures
contract which will be returned to the Fund upon the proper termination of the
futures contract. The margin deposits made are marked to market daily and the
Fund may be required to make subsequent deposits called "variation margin", with
the Fund's Custodian, in the account in the name of the broker, which are
reflective of price fluctuations in the futures contract. Currently, interest
rates futures contracts can be purchased on debt securities such as U.S.
Treasury Bills and Bonds, U.S. Treasury Notes with maturities between 6 1/2 and
10 years, GNMA Certificates and Bank Certificates of Deposit.
 
   
    INDEX FUTURES CONTRACTS.  The Fund may invest in index futures contracts. An
index futures contract sale creates an obligation by the Fund, as seller, to
deliver cash at a specified future time. An index futures contract purchase
would create an obligation by the Fund, as purchaser, to take delivery of cash
at a specified future time. Futures contracts on indexes do not require the
physical delivery of securities, but provide for a final cash settlement on the
expiration date which reflects accumulated profits and losses credited or
debited to each party's account.
    
 
                                       25
<PAGE>
    The Fund is required to maintain margin deposits with brokerage firms
through which it effects index futures contracts in a manner similar to that
described above for interest rate futures contracts. Currently, the initial
margin requirement is approximately 5% of the contract amount for index futures.
In addition, due to current industry practice, daily variations in gains and
losses on open contracts are required to be reflected in cash in the form of
variation margin payments. The fund may be required to make additional margin
payments during the term of the contract.
 
    At any time prior to expiration of the futures contract, the Fund may elect
to close the position by taking an opposite position which will operate to
terminate the fund's position in the futures contract. A final determination of
variation margin is then made, additional cash is required to be paid by or
released to the Fund and the Fund realizes a loss or a gain.
 
    Currently, index futures contracts can be purchased or sold with respect to,
among others, the Standard & Poor's 500 Stock Price Index and the Standard &
Poor's 100 Stock Price Index on the Chicago Mercantile Exchange, the New York
Stock Exchange Composite Index on the New York Futures Exchange, the Major
Market Index on the American Stock Exchange, the Moody's Investment-Grade
Corporate Bond Index on the Chicago Board of Trade and the Value Line Stock
Index on the Kansas City Board of Trade.
 
    OPTIONS ON FUTURES CONTRACTS.  The Fund may purchase and write call and put
options on futures contracts and enter into closing transactions with respect to
such options to terminate an existing position. An option on a futures contract
gives the purchaser the right (in return for the premium paid), and the writer
the obligation, to assume a position in a futures contract (a long position if
the option is a call and a short position if the option is a put) at a specified
exercise price at any time during the term of the option. Upon exercise of the
option, the delivery of the futures position by the writer of the option to the
holder of the option is accompanied by delivery of the accumulated balance in
the writer's futures margin account, which represents the amount by which the
market price of the futures contract at the time of exercise exceeds, in the
case of a call, or is less than, in the case of a put, the exercise price of the
option on the futures contract.
 
    The Fund will purchase and write options on futures contracts for identical
purposes to those set forth above for the purchase of a futures contract
(purchase of a call option or sale of a put option) and the sale of a futures
contract (purchase of a put option or sale of a call option), or to close out a
long or short position in futures contracts. If, for example, the Investment
Manager wished to protect against an increase in interest rates and the
resulting negative impact on the value of a portion of its fixed-income
portfolio, it might write a call option on an interest rate futures contract,
the underlying security of which correlates with the portion of the portfolio
the Investment Manager seeks to hedge. Any premiums received in the writing of
options on futures contracts may, of course, augment the total return of the
fund and thereby provide a further hedge against losses resulting from price
declines in portions of the Fund's holdings.
 
    The writer of an option on a futures contract is required to deposit initial
and variation margin pursuant to requirements similar to those applicable to
futures contracts. Premiums received from the writing of an option on a futures
contract are included in initial margin deposits.
 
    LIMITATIONS ON FUTURES CONTRACTS AND OPTIONS ON FUTURES.  The Fund may not
enter into futures contracts or purchase related options thereon if, immediately
thereafter, the amount committed to margin plus the amount paid for premiums for
unexpired options on futures contracts exceeds 5% of the value of the Fund's
total assets, after taking into account unrealized gains and unrealized losses
on such contracts it has entered into, provided, however, that in the case of an
option that is in-the-money (the exercise price of the call (put) option is less
(more) than the market price of the underlying security) at the time of
purchase, the in-the-money amount may be excluded in calculating the 5%.
However, there is no overall limitation on the percentage of the Fund's assets
which may be subject to a hedge position. In addition, in accordance with the
regulations of the Commodity Futures Trading Commission ("CFTC") under which the
Fund is exempted from registration as a commodity pool operator, the fund may
only enter into futures contracts and options on futures contracts transactions
for purposes of hedging a part
 
                                       26
<PAGE>
   
or all of its portfolio. If the CFTC changes its regulations so that the Fund
would be permitted to write options on futures contracts for purposes other than
hedging the Fund's investments without CFTC registration, the Fund may engage in
such transactions for those purposes. Except as described above, there are no
other limitations on the use of futures and options thereon by the Fund.
    
 
   
    RISKS OF TRANSACTIONS IN FUTURES CONTRACTS AND RELATED OPTIONS.  The Fund
may sell a futures contract to protect against the decline in the value of
securities held by the fund. However, it is possible that the futures market may
advance and the value of securities held in the portfolio of the Fund may
decline. If this occurred, the Fund would lose money on the futures contract and
also experience a decline in value of its portfolio securities. However, while
this could occur for a very brief period or to a very small degree, over time
the value of a diversified portfolio will tend to move in the same direction as
the futures contracts.
    
 
    If the Fund purchases a futures contract to hedge against the increase in
value of securities it intends to buy, and the value of such securities
decreases, then the Fund may determine not to invest in the securities as
planned and will realize a loss on the futures contract that is not offset by a
reduction in the price of the securities.
 
    In addition, if the Fund holds a long position in a futures contract or has
sold a put option on a futures contract, it will hold cash, U.S. Government
securities or other liquid portfolio securities equal to the purchase price of
the contract or the exercise price of the put option (less the amount of initial
or variation margin on deposit) in a segregated account maintained for the fund
by its Custodian. Alternatively, the fund could cover its long position by
purchasing a put option on the same futures contract with an exercise price as
high or higher than the price of the contract held by the Fund.
 
    If the Fund maintains a short position in a futures contract or has sold a
call option on a futures contract, it will cover this position by holding, in a
segregated account maintained at its Custodian, cash, U.S. Government securities
or other liquid portfolio securities equal in value (when added to any initial
or variation margin on deposit) to the market value of the securities underlying
the futures contract or the exercise price of the option. Such a position may
also be covered by owning the securities underlying the futures contract (in the
case of a stock index futures contract a portfolio of securities substantially
replicating the relevant index), or by holding a call option permitting the fund
to purchase the same contract at a price no higher than the price at which the
short position was established.
 
    Exchanges may limit the amount by which the price of 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.
 
    The extent to which the Fund may enter into transactions involving options
and futures contracts may be limited by the Internal Revenue Code's requirements
for qualification as a regulated investment company and the fund's intention to
qualify as such. See "Dividends, Distributions and Taxes" in the Prospectus and
the Statement of Additional Information.
 
    There may exist an imperfect correlation between the price movements of
futures contracts purchased by the Fund and the movements in the prices of the
securities which are the subject of the hedge. If participants in the futures
market elect to close out their contracts through offsetting transactions rather
than meet margin deposit requirements, distortions in the normal relationship
between the debt securities and futures markets could result. Price distortions
could also result if investors in futures contracts opt to make or take delivery
of underlying securities rather than engage in closing transactions due to the
resultant reduction in the liquidity of the futures market. In addition, due to
the fact that, from the point of view of speculators, the deposit requirements
in the futures markets are less onerous than margin requirements in the cash
market, increased participation by speculators in the futures market could cause
temporary price distortions. Due to the possibility of price distortions in the
futures market and because of the imperfect correlation between movements in the
prices of securities and movements in the prices of futures contracts, a correct
forecast of interest rate trends by the Investment Manager may still not result
in a successful hedging transaction.
 
                                       27
<PAGE>
   
    There is no assurance that a liquid secondary market will exist for futures
contracts and related options in which a fund may invest. In the event a liquid
market does not exist, it may not be possible to close out a futures position,
and in the event of adverse price movements, the Fund would continue to be
required to make daily cash payments of variation margin. In addition,
limitations imposed by an exchange or board of trade on which futures contracts
are traded may compel or prevent the Fund from closing out a contract which may
result in reduced gain or increased loss to the Fund. The absence of a liquid
market in futures contracts might cause the Fund to make or take delivery of the
underlying securities at a time when it may be disadvantageous to do so.
    
 
    Compared to the purchase or sale of futures contracts, the purchase of call
or put options on futures contracts involves less potential risk to a fund
because the maximum amount at risk is the premium paid for the options (plus
transaction costs). However, there may be circumstances when the purchase of a
call or put option on a futures contract would result in a loss to a fund
notwithstanding that the purchase or sale of a futures contract would not result
in a loss, as in the instance where there is no movement in the prices of the
futures contract or underlying securities.
 
    The Investment Manager has substantial experience in the use of the
investment techniques described above under the heading "Options and Futures
Transactions," which techniques require skills different from those needed to
select the portfolio securities underlying various options and futures
contracts.
 
    WHEN-ISSUED AND DELAYED DELIVERY SECURITIES AND FORWARD COMMITMENTS.  As
discussed in the Prospectus, from time to time, in the ordinary course of
business, the Fund may purchase securities on a when-issued or delayed delivery
basis and 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. The securities so purchased are subject to market
fluctuation and no interest accrues to the purchaser during this period. While
the Fund will only purchase securities on a when-issued, delayed delivery or
forward commitment basis with the intention of acquiring the securities, the
Fund may sell the securities before the settlement date, if it is deemed
advisable. At the time the Fund makes the commitment to purchase securities on a
when-issued or delayed delivery basis, the Fund will record the transaction and
thereafter reflect the value, each day, of such security in determining the net
asset value of the Fund. At the time of delivery of the securities, the value
may be more or less than the purchase price. The Fund will also establish a
segregated account with the Fund's custodian bank in which it will continuously
maintain cash or U.S. Government securities or other liquid portfolio securities
equal in value to commitments for such when-issued or delayed delivery
securities; subject to this requirement, the Fund may purchase securities on
such basis without limit. An increase in the percentage of the Fund's assets
committed to the purchase of securities on a when-issued or delayed delivery
basis may increase the volatility of the Fund's net asset value.
 
    WHEN, AS AND IF ISSUED SECURITIES.  As discussed in the Prospectus, the Fund
may purchase securities on a "when, as and if issued" basis under which the
issuance of the security depends upon the occurrence of a subsequent event, such
as approval of a merger, corporate reorganization, leveraged buyout or debt
restructuring. The commitment for the purchase of any such security will not be
recognized in the portfolio of the Fund until the Investment Manager determines
that issuance of the security is probable. At such time, the Fund will record
the transaction and, in determining its net asset value, will reflect the value
of the security daily. At such time, the Fund will also establish a segregated
account with its custodian bank in which it will continuously maintain cash or
U.S. Government securities or other liquid portfolio securities equal in value
to recognized commitments for such securities. Settlement of the trade will
occur within five business days of the occurrence of the subsequent event.
Subject to the foregoing restrictions and restrictions under the Act (see
"Investment Restrictions" below and in the Prospectus), the Fund may purchase
securities on such basis without limit. An increase in the percentage of the
Fund's assets committed to the purchase of securities on a "when, as and if
issued"
 
                                       28
<PAGE>
basis may increase the volatility of its net asset value. The Fund may also sell
securities on a "when, as and if issued" basis provided that the issuance of the
security will result automatically from the exchange or conversion of a security
owned by the Fund at the time of the sale.
 
    NEW INSTRUMENTS.  New financial products and various combinations thereof
continue to be developed. The Fund may invest in any such products as may be
developed, to the extent consistent with its investment objective and applicable
regulatory requirements.
 
   
    PORTFOLIO TURNOVER.  It is anticipated that the portfolio turnover rate of
the Fund will not exceed 400%. A 400% turnover rate would occur, for example, if
400% of the securities held in the Fund (excluding all securities whose
maturities at acquisition were one year or less) were sold and replaced within
one year.
    
 
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
    In addition to the investment restrictions enumerated the Prospectus, the
investment restrictions listed below have been adopted by the Fund as
fundamental policies, except as otherwise indicated. Under 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. Such a
majority is defined as the lesser of (a) 67% or more of the shares present at a
meeting of shareholders, if the holders of 50% of the outstanding shares of the
Fund are present or represented by proxy or (b) more than 50% of the outstanding
shares of the Fund.
 
    The Fund may not:
 
         1. Purchase or sell real estate or interests therein (including limited
    partnership interests), although the Fund may purchase securities of issuers
    which engage in real estate operations and securities secured by real estate
    or interests therein.
 
         2. Borrow money, except that the Fund may borrow from a bank for
    temporary or emergency purposes in an amount not exceeding 5% (taken at the
    lower of cost or current value) of its total assets (not including the
    amount borrowed).
 
         3. Issue senior securities as defined in the Act, except insofar as
    permitted in Investment Restriction 2 and except insofar as the Fund may be
    deemed to have issued a senior security by reason of entering into
    repurchase agreements.
 
         4. Make short sales of securities.
 
         5. Engage in the underwriting of securities, except insofar as the Fund
    may be deemed an underwriter under the Securities Act of 1933 in disposing
    of a portfolio security.
 
         6. Invest for the purpose of exercising control or management of any
    other issuer.
 
         7. Purchase or sell commodities or commodities contracts except that
    the Fund may purchase or write interest rate, currency and stock and bond
    index futures contracts and related options thereon.
 
         8. Pledge its assets or assign or otherwise encumber them except to
    secure permitted borrowings. (For the purpose of this restriction,
    collateral arrangements with respect to the writing of options by the Fund
    and collateral arrangements with respect to initial or variation margin for
    futures by the Fund are not deemed to be pledges of assets.)
 
         9. Purchase securities on margin (but the Fund may obtain short-term
    loans as are necessary for the clearance of transactions). The deposit or
    payment by the Fund of initial or variation margin in connection with
    futures contracts or related options thereon is not considered the purchase
    of a security on margin.
 
        10. Make loans of money or securities, except by investment in
    repurchase agreements. (For the purpose of this restriction, lending of
    portfolio securities by the Fund are not deemed to be loans).
 
                                       29
<PAGE>
    Notwithstanding any other investment policy or restriction, the Fund may
seek to achieve its investment objectives by investing all or substantially all
of its assets in another investment company having substantially the same
investment objectives and policies as the Fund.
 
PORTFOLIO TRANSACTIONS AND BROKERAGE
- --------------------------------------------------------------------------------
 
    Subject to the general supervision of the Board of Trustees, the Investment
Manager is responsible for decisions to buy and sell securities for the Fund,
the selection of brokers and dealers to effect the transactions, and the
negotiation of brokerage commissions, if any. Purchases and sales of securities
on a stock exchange are effected through brokers who charge a commission for
their services. In the over-the-counter market, securities are generally traded
on a "net" basis with dealers acting as principal for their own accounts without
a stated commission, although the price of the security usually includes a
profit to the dealer. The Fund also expect that securities will be purchased at
times in underwritten offerings where the price includes a fixed amount of
compensation, generally referred to as the underwriter's concession or discount.
Futures transactions are usually effected through a broker and a commission will
be charged. On occasion, the Fund may also purchase certain money market
instruments directly from an issuer, in which case no commissions or discounts
are paid.
 
   
    The Investment Manager currently serves as investment manager to a number of
clients, including other investment companies, and may in the future act as
investment manager or adviser to others. It is the practice of the Investment
Manager to cause purchase and sale transactions to be allocated among the Fund
and others whose assets it manages in such manner as it deems equitable. In
making such allocations among the Fund and other client accounts, various
factors may be considered, including the respective investment objectives, the
relative size of portfolio holdings of the same or comparable securities, the
availability of cash for investment, the size of investment commitments
generally held and the opinions of the persons responsible for managing the Fund
and other client accounts. In the case of certain initial and secondary public
offerings, the Investment Manager may utilize a pro rata allocation process
based on the size of the Morgan Stanley Dean Witter Funds involved and the
number of shares available from the public offering.
    
 
    The policy of the Fund regarding purchases and sales of securities for its
portfolio is that primary consideration will be given to obtaining the most
favorable prices and efficient executions of transactions. Consistent with this
policy, when securities transactions are effected on a stock exchange, the
Fund's policy is to pay commissions which are considered fair and reasonable
without necessarily determining that the lowest possible commissions are paid in
all circumstances. The Fund believe that a requirement always to seek the lowest
possible commission cost could impede effective portfolio management and
preclude the Fund and the Investment Manager from obtaining a high quality of
brokerage and research services. In seeking to determine the reasonableness of
brokerage commissions paid in any transaction, the Investment Manager relies
upon its experience and knowledge regarding commissions generally charged by
various brokers and on its judgment in evaluating the brokerage and research
services received from the broker effecting the transaction. Such determinations
are necessarily subjective and imprecise, as in most cases an exact dollar value
for those services is not ascertainable.
 
    In seeking to implement the Fund's policies, the Investment Manager effects
transactions with those brokers and dealers who the Investment Manager believes
provide the most favorable prices and are capable of providing efficient
executions. If the Investment Manager believes such prices and executions are
obtainable from more than one broker or dealer, it may give consideration to
placing portfolio transactions with those brokers and dealers who also furnish
research and other services to the Fund or the Investment Manager. Such services
may include, but are not limited to, any one or more of the following:
information as to the availability of securities for purchase or sale;
statistical or factual information or opinions pertaining to investments; wire
services; and appraisals or evaluations of portfolio securities.
 
                                       30
<PAGE>
    The information and services received by the Investment Manager from brokers
and dealers may be of benefit to the Investment Manager in the management of
accounts of some of its other clients and may not in all cases benefit the Fund
directly. While the receipt of such information and services is useful in
varying degrees and would generally reduce the amount of research or services
otherwise performed by the Investment Manager and thereby reduce its expenses,
it is of indeterminable value and the management fee paid to the Investment
Manager is not reduced by any amount that may be attributable to the value of
such services.
 
    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. ("DWR"). The Fund will limit their transactions with DWR to
U.S. Government and Government Agency Securities, Bank Money Instruments (i.e.,
Certificates of Deposit and Bankers' Acceptances) and Commercial Paper. Such
transactions will be effected with DWR only when the price available from DWR is
better than that available from other dealers.
 
    Consistent with the policy described above, brokerage transactions in
securities listed on exchanges or admitted to unlisted trading privileges may be
effected through Morgan Stanley & Co., Incorporated ("MS&Co."), DWR and other
affiliated brokers and dealers. In order for an affiliated broker or dealer to
effect any portfolio transactions for the Fund, the commissions, fees or other
remuneration received by the affiliated broker or dealer must be reasonable and
fair compared to the commissions, fees or other remuneration paid to other
brokers in connection with comparable transactions involving similar securities
being purchased or sold on an exchange during a comparable period of time. This
standard would allow the affiliated broker or dealer to receive no more than the
remuneration which would be expected to be received by an unaffiliated broker in
a commensurate arm's-length transaction. Furthermore, the Board of Trustees of
the Fund, including a majority of the Trustees who are not "interested" persons
of the Fund, as defined in the Act, have adopted procedures which are reasonably
designed to provide that any commissions, fees or other remuneration paid to an
affiliated broker or dealer are consistent with the foregoing standard. The Fund
does not reduce the management fee they pay to the Investment Manager by any
amount of the brokerage commissions they may pay to an affiliated broker or
dealer.
 
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 Underwriting
Agreement provides that the obligation of the Underwriter is subject to certain
conditions precedent (such as the filing of certain forms and documents required
by various federal and state agencies and the rendering of certain opinions of
counsel) and that the Underwriter will be obligated to purchase the shares of
the Fund on February 24, 1999, or such other date as may be agreed upon between
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.
    
 
    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 $10.00 per share going to the Fund.
 
    The Underwriter may, however, receive contingent deferred sales charges for
future redemptions of Class A, Class B and Class C shares (see "Purchase of Fund
Shares--Continuous Offering" in the Prospectus).
 
    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.
 
                                       31
<PAGE>
    The minimum number of Fund shares which may be purchased pursuant to this
offering is 100 shares. Certificates for shares purchased will not be issued
unless requested by the shareholder in writing.
 
    The Underwriter has agreed to pay certain expenses of the initial offering
and the subsequent Continuous Offering of the Fund's shares. The Fund has agreed
to pay certain compensation to the Underwriter pursuant to a Plan of
Distribution pursuant to Rule 12b-1 under the Act, to compensate the Underwriter
for services it renders and the expenses it bears under the Underwriting
Agreement (see "The Distributor"). The Fund will bear the cost of initial
typesetting, printing and distribution of Prospectuses and Statements of
Additional Information and supplements thereto to shareholders. The Fund has
agreed to indemnify the Underwriter against certain liabilities, including
liabilities under the Securities Act of 1933, as amended.
 
THE DISTRIBUTOR
- --------------------------------------------------------------------------------
 
    As discussed in the Prospectus, shares of the Fund are distributed by Morgan
Stanley Dean Witter Distributors Inc. (the "Distributor"). The Distributor has
entered into a selected dealer agreement with DWR, which through its own sales
organization sells shares of the Fund. In addition, the Distributor may enter
into selected dealer agreements with other selected broker-dealers. The
Distributor, a Delaware corporation, is a wholly-owned subsidiary of MSDW. The
Trustees of the Fund, including a majority of the Trustees who are not, and were
not at the time they voted, interested persons of the Fund, as defined in the
Act (the "Independent Trustees"), approved, at their meeting held on November 6,
1997, the current Distribution Agreement appointing the Distributor as exclusive
distributor of the Fund's shares and providing for the Distributor to bear
distribution expenses not borne by the Fund. By its terms, the Distribution
Agreement has an initial term ending April 30, 1999 and will remain in effect
from year to year thereafter if approved by the Board.
 
    The Distributor bears all expenses it may incur in providing services under
the Distribution Agreement. Such expenses include the payment of commissions for
sales of the Fund's shares and incentive compensation to Morgan Stanley Dean
Witter Financial Advisors and other selected broker-dealer representatives. The
Distributor also pays certain expenses in connection with the distribution of
the Fund's shares, including the costs of preparing, printing and distributing
advertising or promotional materials, and the costs of printing and distributing
prospectuses and supplements thereto used in connection with the offering and
sale of the Fund's shares. The Fund bears the costs of initial typesetting,
printing and distribution of prospectuses and supplements thereto to
shareholders. The Fund also bears the costs of registering the Fund and its
shares under federal securities laws and pays filing fees in accordance with
state securities laws. The Fund and the Distributor have agreed to indemnify
each other against certain liabilities, including liabilities under the
Securities Act of 1933, as amended. Under the Distribution Agreement, the
Distributor uses its best efforts in rendering services to the Fund, but in the
absence of willful misfeasance, bad faith, gross negligence or reckless
disregard of its obligations, the Distributor is not liable to the Fund or any
of its shareholders for any error of judgment or mistake of law or for any act
or omission or for losses sustained by the Fund or its shareholders.
 
PLAN OF DISTRIBUTION
 
    The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the
Act (the "Plan") pursuant to which each Class, other than Class D, pays the
Distributor compensation accrued daily and payable monthly at the following
annual rates: 0.25%, 1.0% and 1.0% of the average daily net assets of Class A,
Class B and Class C, respectively. The Distributor also receives the proceeds of
front-end sales charges and of contingent deferred sales charges imposed on
certain redemptions of shares, which are separate and apart from payments made
pursuant to the Plan (see "Purchase of Fund Shares" in the Prospectus).
 
                                       32
<PAGE>
    The Distributor has informed the Fund that the entire fee payable by Class A
and a portion of the fees payable by each of Class B and Class C each year
pursuant to the Plan equal to 0.25% of such Class's average daily net assets are
currently each characterized as a "service fee" under the Rules of the
Association of the National Association of Securities Dealers, Inc. (of which
the Distributor is a member). The "service fee" is a payment made for personal
service and/or the maintenance of shareholder accounts. The remaining portion of
the Plan fees payable by a Class, if any, is characterized as an "asset-based
sales charge" as such is defined by the aforementioned Rules of the Association.
 
   
    The Plan was adopted by a majority vote of the Board of Trustees, including
all of the Trustees of the Fund who are not "interested persons" of the Fund (as
defined in the Act) and who have no direct or indirect financial interest in the
operation of the Plan (the "Independent 12b-1 Trustees"), cast in person at a
meeting called for the purpose of voting on the Plan, on December 2, 1998.
    
 
    Under the Plan and as required by Rule 12b-1, the Trustees receive and
review promptly after the end of each calendar quarter a written report provided
by the Distributor of the amounts expended under the Plan and the purpose for
which such expenditures were made.
 
    The Plan was adopted in order to permit the implementation of the Fund's
method of distribution. Under this distribution method the Fund offers four
Classes of shares, each with a different distribution arrangement as set forth
in the Prospectus.
 
   
    With respect to Class A shares, DWR compensates its Financial Advisors by
paying them, from proceeds of the front-end sales charge, commissions for the
sale of Class A shares, currently a gross sales credit of up to 5.0% of the
amount sold (except as provided in the following sentence) and an annual
residual commission, currently a residual of up to 0.25% of the current value of
the respective accounts for which they are the Financial Advisors or dealers of
record in all cases. On orders of $1 million or more (for which no sales charge
was paid) or net asset value purchases by employer-sponsored employee benefit
plans, whether or not qualified under the Internal Revenue Code, for which
Morgan Stanley Dean Witter Trust FSB ("MSDW Trust" or "Transfer Agent") serves
as Trustee or DWR's Retirement Plan Services serves as recordkeeper pursuant to
a written Recordkeeping Services Agreement ("MSDW Eligible Plans"), the
Investment Manager compensates DWR's Financial Advisors by paying them, from its
own funds, a gross sales credit of 1.0% of the amount sold.
    
 
   
    With respect to Class B shares, DWR compensates its Financial Advisors by
paying them, from its own funds, commissions for the sale of Class B shares,
currently a gross sales credit of up to 5.0% of the amount sold (except as
provided in the following sentence) and an annual residual commission, currently
a residual of up to 0.25% of the current value (not including reinvested
dividends or distributions) of the amount sold in all cases. In the case of
Class B shares purchased on or after July 28, 1997 by qualified MSDW Eligible
Plans or Class B shares purchased on or after January 1, 1999 by non-qualified
MSDW Eligible Plans, DWR compensates its Financial Advisors by paying them, from
its own funds, a gross sales credit of 3.0% of the amount sold.
    
 
    With respect to Class C shares, DWR compensates its Financial Advisors by
paying them, from its own funds, commissions for the sale of Class C shares,
currently a gross sales credit of up to 1.0% of the amount sold and an annual
residual commission, currently a residual of up to 1.0% of the current value of
the respective accounts for which they are the Financial Advisors of record.
 
   
    With respect to Class D shares other than shares held by participants in the
Investment Manager's mutual fund asset allocation program, the Investment
Manager compensates DWR's Financial Advisors by paying them, from its own funds,
commissions for the sale of Class D shares, currently a gross sales credit of up
to 1.0% of the amount sold. There is a chargeback of 100% of the amount paid if
the Class D shares are redeemed in the first year and a chargeback of 50% of the
amount paid if the Class D shares are redeemed in the second year after
purchase. The Investment Manager also compensates DWR's Financial Advisors by
paying them, from its own funds, an annual residual commission, currently a
    
 
                                       33
<PAGE>
   
residual of up to 0.10% of the current value of the respective accounts for
which they are the Financial Advisors of record (not including accounts of
participants in the Investment Manager's mutual fund asset allocation program).
    
 
    The gross sales credit is a charge which reflects commissions paid by DWR to
its Financial Advisors and DWR's Fund-associated distribution-related expenses,
including sales compensation, and overhead and other branch office
distribution-related expenses including (a) the expenses of operating DWR's
branch offices in connection with the sale of Fund shares, including lease
costs, the salaries and employee benefits of operations and sales support
personnel, utility costs, communications costs and the costs of stationery and
supplies, (b) the costs of client sales seminars, (c) travel expenses of mutual
fund sales coordinators to promote the sale of Fund shares and (d) other
expenses relating to branch promotion of Fund sales. The distribution fee that
the Distributor receives from the Fund under the Plan, in effect, offsets
distribution expenses incurred under the Plan on behalf of the Fund and, in the
case of Class B shares, opportunity costs, such as the gross sales credit and an
assumed interest charge thereon ("carrying charge"). In the Distributor's
reporting of the distribution expenses to the Fund, in the case of Class B
shares, such assumed interest (computed at the "broker's call rate") has been
calculated on the gross credit as it is reduced by amounts received by the
Distributor under the Plan and any contingent deferred sales charges received by
the Distributor upon redemption of shares of the Fund. No other interest charge
is included as a distribution expense in the Distributor's calculation of its
distribution costs for this purpose. The broker's call rate is the interest rate
charged to securities brokers on loans secured by exchange-listed securities.
 
    The Fund is authorized to reimburse expenses incurred or to be incurred in
promoting the distribution of the Fund's Class A and Class C shares and in
servicing shareholder accounts. Reimbursement will be made through payments at
the end of each month. The amount of each monthly payment may in no event exceed
an amount equal to a payment at the annual rate of 0.25%, in the case of Class
A, and 1.0%, in the case of Class C, of the average net assets of the respective
Class during the month. No interest or other financing charges, if any, incurred
on any distribution expenses on behalf of Class A and Class C will be
reimbursable under the Plan. With respect to Class A, in the case of all
expenses other than expenses representing the service fee, and, with respect to
Class C, in the case of all expenses other than expenses representing a gross
sales credit or a residual to Morgan Stanley Dean Witter Financial Advisors and
other selected broker-dealer representatives, such amounts shall be determined
at the beginning of each calendar quarter by the Trustees, including a majority
of the Independent 12b-1 Trustees. Expenses representing the service fee (for
Class A) or a gross sales credit or a residual to Morgan Stanley Dean Witter
Financial Advisors and other selected broker-dealer representatives (for Class
C) may be reimbursed without prior determination. In the event that the
Distributor proposes that monies shall be reimbursed for other than such
expenses, then in making quarterly determinations of the amounts that may be
reimbursed by the Fund, the Distributor will provide and the Trustees will
review a quarterly budget of projected distribution expenses to be incurred on
behalf of the Fund, together with a report explaining the purposes and
anticipated benefits of incurring such expenses. The Trustees will determine
which particular expenses, and the portions thereof, that may be borne by the
Fund, and in making such a determination shall consider the scope of the
Distributor's commitment to promoting the distribution of the Fund's Class A and
Class C shares.
 
    At any given time, the expenses of distributing shares of the Fund may be
more or less than the total of (i) the payments made by the Fund pursuant to the
Plan and (ii) the proceeds of contingent deferred sales charges paid by
investors upon redemption of shares. Because there is no requirement under the
Plan that the Distributor be reimbursed for all distribution expenses with
respect to Class B shares or any requirement that the Plan be continued from
year to year, this 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
contingent deferred sales charges paid by investors upon redemption of shares,
if for any reason the Plan is terminated, the
 
                                       34
<PAGE>
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 contingent deferred sales charges, may or may not be recovered through
future distribution fees or contingent deferred sales charges.
 
    No interested person of the Fund nor any Trustee of the Fund who is not an
interested person of the Fund, as defined in the Act, has any direct financial
interest in the operation of the Plan except to the extent that the Distributor,
MSDW Advisors, MSDW Services, DWR or certain of their employees may be deemed to
have such an interest as a result of benefits derived from the successful
operation of the Plan or as a result of receiving a portion of the amounts
expended thereunder by the Fund.
 
    Under its terms, the Plan has an initial term ending April 30, 1999 and will
continue from year to year thereafter, provided such continuance is approved
annually by a vote of the Trustees in the manner described above.
 
    The Plan may not be amended to increase materially the amount to be spent
for the services described therein without approval by the shareholders of the
affected Class or Classes of the Fund, and all material amendments to the Plan
must also be approved by the Trustees in the manner described above. The Plan
may be terminated at any time, without payment of any penalty, by vote of a
majority of the Independent 12b-1 Trustees or by a vote of a majority of the
outstanding voting securities of the Fund (as defined in the Act) on not more
than thirty days' written notice to any other party to the Plan. So long as the
Plan is in effect, the election and nomination of Independent 12b-1 Trustees
shall be committed to the discretion of the Independent 12b-1 Trustees.
 
DETERMINATION OF NET ASSET VALUE
- --------------------------------------------------------------------------------
 
    The procedures for valuing the securities held by the Fund are set forth in
the Fund's Prospectus. As stated in the Prospectus, short-term securities with
remaining maturities of sixty days or less at the time of purchase are valued at
amortized cost, unless the Trustees determine such does not reflect the
securities' market value, in which case these securities will be valued at their
fair value as determined by the Trustees. Other short-term debt securities will
be valued on a mark-to-market basis until such time as they reach a remaining
maturity of sixty days, whereupon they will be valued at amortized cost using
their value on the 61st day unless the Trustees determine such does not reflect
the securities' market value, in which case these securities will be valued at
their fair value as determined by the Trustees. All other securities and other
assets are valued at their fair value as determined in good faith under
procedures established by and under the supervision of the Trustees.
 
    The net asset value per share for each Class of shares of the Fund is
determined once daily as of 4:00 p.m., New York time (or, on days when the New
York Stock Exchange closes prior to 4:00 p.m., at such earlier time), on each
day that the New York Stock Exchange is open. The New York Stock Exchange
currently observes the following holidays: New Year's Day, Reverend Dr. Martin
Luther King, Jr. Day, Presidents' Day, Good Friday, Memorial Day, Independence
Day, Labor Day, Thanksgiving Day, and Christmas Day.
 
   
PURCHASE OF FUND SHARES
    
- --------------------------------------------------------------------------------
 
    As discussed in the Prospectus, the Fund offers four Classes of shares as
follows:
 
INITIAL SALES CHARGE ALTERNATIVE--CLASS A SHARES
 
    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 in the circumstances
discussed in the Prospectus.
 
   
    RIGHT OF ACCUMULATION.  As discussed in the Prospectus, investors may
combine the current value of shares purchased in separate transactions for
purposes of benefitting from the reduced sales charges available for purchases
of shares of the Fund totalling at least $25,000 in net asset value. For
example, if
    
 
                                       35
<PAGE>
any person or entity who qualifies for this privilege holds Class A shares of
the Fund and/or other Morgan Stanley Dean Witter Funds that are multiple class
funds ("Morgan Stanley Dean Witter Multi-Class Funds") or shares of other Morgan
Stanley Dean Witter Funds sold with a front-end sales charge purchased at a
price including a front-end sales charge having a current value of $5,000, and
purchases $20,000 of additional shares of the Portfolio, the sales charge
applicable to the $20,000 purchase would be 4.75% of the offering price.
 
    The Distributor must be notified by the 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 selected broker-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 Distributor or Morgan Stanley Dean Witter Trust FSB (the
"Transfer Agent") fails to confirm the investor's represented holdings.
 
   
    LETTER OF INTENT.  As discussed in the Prospectus, reduced sales charges are
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 Morgan Stanley
Dean Witter Funds sold with a front-end sales charge from the Distributor or
from a single Selected Broker-Dealer.
    
 
    A Letter of Intent permits an investor to establish a total investment goal
to be achieved by any number of purchases over a thirteen-month period. Each
purchase of Class A shares made during the period will receive the reduced sales
commission applicable to the amount represented by the goal, as if it were a
single purchase. A number of shares equal in value to 5% of the dollar amount of
the Letter of Intent will be held in escrow by the Transfer Agent, in the name
of the shareholder. The initial purchase under a Letter of Intent must be equal
to at least 5% of the stated investment goal.
 
    The Letter of Intent does not obligate the investor to purchase, nor the
Fund to sell, the indicated amount. In the event the Letter of Intent goal is
not achieved within the thirteen-month period, the investor is required to pay
the difference between the sales charge otherwise applicable to the purchases
made during this period and sales charges actually paid. Such payment may be
made directly to the Distributor or, if not paid, the Distributor is authorized
by the shareholder to liquidate a sufficient number of his or her escrowed
shares to obtain such difference.
 
    If the goal is exceeded and purchases pass the next sales charge level, the
sales charge on the entire amount of the purchase that results in passing that
level and on subsequent purchases will be subject to further reduced sales
charges in the same manner as set forth above under "Right of Accumulation," but
there will be no retroactive reduction of sales charges on previous purchases.
For the purpose of determining whether the investor is entitled to a further
reduced sales charge applicable to purchases at or above a sales charge level
which exceeds the stated goal of a Letter of Intent, the cumulative current net
asset value of any shares owned by the investor in any other Morgan Stanley Dean
Witter Funds held by the shareholder which were 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) will be added to the cost or net asset value of shares of the
Fund owned by the investor. However, shares of "Exchange Funds" (see
"Shareholder Services--Exchange Privilege") and the purchase of shares of other
Morgan Stanley Dean Witter Funds will not be included in determining whether the
stated goal of a Letter of Intent has been reached.
 
    At any time while a Letter of Intent is in effect, a shareholder may, by
written notice to the Distributor, increase the amount of the stated goal. In
that event, only shares purchased during the previous 90-day period and still
owned by the shareholder will be included in the new sales charge reduction. The
5% escrow and minimum purchase requirements will be applicable to the new stated
goal. Investors electing to purchase shares of the Fund pursuant to a Letter of
Intent should carefully read such Letter of Intent.
 
                                       36
<PAGE>
CONTINGENT DEFERRED SALES CHARGE ALTERNATIVE--CLASS B SHARES
 
   
    Class B shares are sold without an initial sales charge but are subject to a
CDSC payable upon most redemptions within six years after purchase. As stated in
the Prospectus, a CDSC will be imposed on any redemption by an investor if after
such redemption the current value of the investor's Class B shares of the Fund
is less than the dollar amount of all payments by the shareholder for the
purchase of Class B shares during the preceding six years. However, no CDSC will
be imposed to the extent that the net asset value of the shares redeemed does
not exceed: (a) the current net asset value of shares purchased more than six
years prior to the redemption, plus (b) the current net asset value of shares
purchased through reinvestment of dividends or distributions of the Fund or
another Morgan Stanley Dean Witter Fund (see "Shareholder Services--Targeted
Dividends"), plus (c) the current net asset value of shares acquired in exchange
for (i) shares of Morgan Stanley Dean Witter front-end sales charge funds, or
(ii) shares of other Morgan Stanley Dean Witter Funds for which shares of
front-end sales charge funds have been exchanged (see "Shareholder
Services--Exchange Privilege"), plus (d) increases in the net asset value of the
investor's shares above the total amount of payments for the purchase of Fund
shares made during the preceding six years. The CDSC will be paid to the
Distributor.
    
 
   
    In determining the applicability of the CDSC to each redemption, the amount
which represents an increase in the net asset value of the investor's shares
above the amount of the total payments for the purchase of shares within the
last six years will be redeemed first. In the event the redemption amount
exceeds such increase in value, the next portion of the amount redeemed will be
the amount which represents the net asset value of the investor's shares
purchased more than six years prior to the redemption and/or shares purchased
through reinvestment of dividends or distributions and/or shares acquired in
exchange for shares of Morgan Stanley Dean Witter front-end sales charge funds,
or for shares of other Morgan Stanley Dean Witter funds for which shares of
front-end sales charge funds have been exchanged. A portion of the amount
redeemed which exceeds an amount which represents both such increase in value
and the value of shares purchased more than six years prior to the redemption
and/or shares purchased through reinvestment of dividends or distributions
and/or shares acquired in the above-described exchanges will be subject to a
CDSC.
    
 
   
    The amount of the CDSC, if any, will vary depending on the number of years
from the time of payment for the purchase of Class B shares of the Fund until
the time of redemption of such shares. For purposes of determining the number of
years from the time of any payment for the purchase of shares, all payments made
during a month will be aggregated and deemed to have been made on the last day
of the month. The following table sets forth the rates of the CDSC applicable to
Class B shares of the Fund:
    
 
<TABLE>
<CAPTION>
                                        YEAR SINCE
                                         PURCHASE                                            CDSC AS A 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>
 
   
    In determining the rate of the CDSC, it will be assumed that a redemption is
made of shares held by the investor for the longest period of time within the
applicable six-year or three-year period. This will result in any such CDSC
being imposed at the lowest possible rate. The CDSC will be imposed, in
accordance with the table shown above, on any redemptions within six years of
purchase which are in excess of these amounts and which redemptions do not
qualify for waiver of the CDSC, as described in the Prospectus.
    
 
                                       37
<PAGE>
LEVEL LOAD ALTERNATIVE--CLASS C SHARES
 
    Class C shares are sold without a sales charge but are subject to a CDSC of
1.0% on most redemptions made within one year after purchase, except in the
circumstances discussed in the Prospectus.
 
NO LOAD ALTERNATIVE--CLASS D SHARES
 
    Class D shares are offered without any sales charge on purchase or
redemption. Class D shares are offered only to those persons meeting the
qualifications set forth in the Prospectus.
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
    Upon the purchase of shares of the Fund, a Shareholder Investment Account is
opened for the investor on the books of the Fund of the Fund and maintained by
the Transfer Agent. This is an open account in which shares owned by the
investor are credited by the Transfer Agent in lieu of issuance of a share
certificate. If a share certificate is desired, it must be requested in writing
for each transaction. Certificates are issued only for full shares and may be
redeposited in the account at any time. There is no charge to the investor for
issuance of a certificate. Whenever a shareholder instituted transaction takes
place in the Shareholder Investment Account, the shareholder will be mailed a
confirmation of the transaction from the Fund or from DWR or other selected
broker-dealer.
 
    AUTOMATIC INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS.  As stated in the
Prospectus, all income dividends and capital gains distributions are
automatically paid in full and fractional shares of the applicable Class of the
Fund, unless the shareholder requests that they be paid in cash. Each purchase
of shares of the Fund is made upon the condition that the Transfer Agent is
thereby automatically appointed as agent of the investor to receive all
dividends and capital gains distributions on shares owned by the investor. Such
dividends and distributions will be paid, at the net asset value per share, in
shares of the applicable Class of the Fund (or in cash if the shareholder so
requests) as of the close of business on the record date. At any time an
investor may request the Transfer Agent, in writing, to have subsequent
dividends and/or capital gains distributions paid to him or her in cash rather
than shares. To assure sufficient time to process the change, such request
should be received by the Transfer Agent at least five business days prior to
the record date of the dividend or distribution. In the case of recently
purchased shares for which registration instructions have not been received on
the record date, cash payments will be made to DWR or other selected
broker-dealer, and will be forwarded to the shareholder, upon the receipt of
proper instructions. It is the Fund's policy and practice that, if checks for
dividends or distributions paid in cash remain uncashed, no interest will accrue
on amounts represented by such uncashed checks.
 
    TARGETED DIVIDENDS.-SM-  In states where it is legally permissible,
shareholders may also have all income dividends and capital gains distributions
automatically invested in shares of any Class of an open-end Morgan Stanley Dean
Witter Fund other than Morgan Stanley Dean Witter Fund of Funds or in another
Class of Morgan Stanley Dean Witter Fund of Funds. Such investment will be made
as described above for automatic investment in shares of the applicable Class of
the Fund, at the net asset value per share of the selected Morgan Stanley Dean
Witter Fund as of the close of business on the payment date of the dividend or
distribution and will begin to earn dividends, if any, in the selected Morgan
Stanley Dean Witter Fund the next business day. To participate in the Targeted
Dividends program, shareholders should contact their Morgan Stanley Dean Witter
Financial Advisor or other selected broker-dealer representative or the Transfer
Agent. Shareholders of the Fund must be shareholders of the selected Class of
the Morgan Stanley Dean Witter Fund targeted to receive investments from
dividends at the time they enter the Targeted Dividends program. Investors
should review the prospectus of the targeted Morgan Stanley Dean Witter Fund
before entering the program.
 
   
    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.
    
 
                                       38
<PAGE>
Shares purchased through EasyInvest will be added to the shareholder's existing
account at the net asset value calculated the same business day the transfer of
funds is effected (subject to any applicable sales charges). Shares of the
Morgan Stanley Dean Witter Money Market Funds redeemed in connection with
EasyInvest are redeemed on the business day preceding the transfer of funds. For
further information or to subscribe to EasyInvest, shareholders should contact
their Morgan Stanley Dean Witter Financial Advisor or other selected
broker-dealer representative or the Transfer Agent.
 
    INVESTMENT OF DIVIDENDS OR DISTRIBUTIONS RECEIVED IN CASH.  As discussed in
the Prospectus, any shareholder who receives a cash payment representing a
dividend or distribution may invest such dividend or distribution in shares of
the applicable Class at net asset value, without the imposition of a CDSC upon
redemption, by returning the check or the proceeds to the Transfer Agent within
thirty days after the payment date. If the shareholder returns the proceeds of a
dividend or distribution, such funds must be accompanied by a signed statement
indicating that the proceeds constitute a dividend or distribution to be
invested. Such investment will be made at the net asset value per share next
determined after receipt of the check or the proceeds by the Transfer Agent.
 
    SYSTEMATIC WITHDRAWAL PLAN.  As discussed in the Prospectus, 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 Contingent Deferred Sales Charge ("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 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.
 
    The Transfer Agent acts as agent for the shareholder in tendering to the
Fund for redemption sufficient full and fractional shares to provide the amount
of the periodic withdrawal payment designated in the application. The shares
will be redeemed at their net asset value determined, at the shareholder's
option, on the tenth or twenty-fifth day (or next following business day) of the
relevant month, quarter, or semi-annual or annual period and normally a check
for the proceeds will be mailed by the Transfer
 
                                       39
<PAGE>
Agent, or amounts credited to a shareholder's Dean Witter Reynolds Inc. or other
selected broker-dealer brokerage account, or amounts deposited electronically
into the shareholder's bank account via the Automated Clearing House, within
five business days after the date of redemption.
 
    Withdrawal Plan payments should not be considered as 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. Although a shareholder may make additional
investments while participating in the Withdrawal Plan, withdrawals made
concurrently with purchases of additional shares are inadvisable because of
sales charges applicable to purchases or redemptions of shares (see "Purchase of
Fund Shares" in the Prospectus).
 
    Any shareholder who wishes to have payments under the Withdrawal Plan made
to a third party or sent to an address other than the one listed on the account
must send complete written instructions to the Transfer Agent to enroll in the
Withdrawal Plan. The shareholder's signature on such instructions must be
guaranteed by an eligible guarantor acceptable to the Transfer Agent
(shareholders should contact the Transfer Agent for a determination as to
whether a particular institution is such an eligible guarantor). A shareholder
may, at any time, change the amount and interval of withdrawal payments through
his or her Morgan Stanley Dean Witter Financial Advisor or other selected
broker-dealer representative or by written notification to the Transfer Agent.
In addition, the party and/or the address to which checks are mailed may be
changed by written notification to the Transfer Agent, with signature guarantees
required in the manner described above. The shareholder may also terminate the
Withdrawal Plan at any time by written notice to the Transfer Agent. In the
event of such termination, the account will be continued as a regular
Shareholder Investment Account. The shareholder may also redeem all or part of
the shares held in the Withdrawal Plan account (see "Redemptions and
Repurchases" in the Prospectus) at any time.
 
    DIRECT INVESTMENTS THROUGH TRANSFER AGENT.  As discussed in the Prospectus,
shareholders may make additional investments in any Class of shares of the Fund
for which they qualify at any time by sending a check in any amount, not less
than $100, payable to Morgan Stanley Dean Witter Aggressive Equity Fund, and
indicating the selected Class, directly to the Fund's Transfer Agent. In the
case of Class A shares, after deduction of any applicable sales charge, the
balance will be applied to the purchase of Fund shares, and, in the case of
shares of the other Classes, the entire amount will be applied to the purchase
of Fund shares, at the net asset value per share next computed after receipt of
the check or purchase payment by the Transfer Agent. The shares so purchased
will be credited to the investor's account.
 
EXCHANGE PRIVILEGE
 
    As discussed in the Prospectus, the Fund makes available to its shareholders
an Exchange Privilege whereby shareholders of each Class of shares of the Fund
may exchange their shares for shares of the same Class of shares any other
Morgan Stanley Dean Witter Multi-Class Fund without the imposition of any
exchange fee. Shares may also be exchanged for shares of any 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 foregoing eight funds are hereinafter referred to as 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 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.
 
                                       40
<PAGE>
    Any new account established through the Exchange Privilege will have the
same registration and cash dividend or dividend reinvestment plan as the present
account, unless the Transfer Agent receives written notification to the
contrary. For telephone exchanges, the exact registration of the existing
account and the account number must be provided.
 
    Any shares held in certificate form cannot be exchanged but must be
forwarded to the Transfer Agent and deposited into the shareholder's account
before being eligible for exchange. (Certificates mailed in for deposit should
not be endorsed.)
 
    As described below, and in the Prospectus under the caption "Purchase of
Fund Shares," a CDSC may be imposed upon a redemption, depending on a number of
factors, including the number of years from the time of purchase until the time
of redemption or exchange ("holding period"). When shares of a Morgan Stanley
Dean Witter Multi-Class Fund are exchanged for shares of an Exchange Fund, the
exchange is executed at no charge to the shareholder, without the imposition of
the CDSC at the time of the exchange. During the period of time the shareholder
remains in the Exchange Fund (calculated from the last day of the month in which
the Exchange Fund shares were acquired), the holding period or "year since
purchase payment made" is frozen. When shares are redeemed out of the Exchange
Fund, they will be subject to a CDSC which would be based upon the period of
time the shareholder held shares in a Morgan Stanley Dean Witter Multi-Class
Fund. However, 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. Shareholders acquiring shares
of an Exchange Fund pursuant to this exchange privilege may exchange those
shares back into a Morgan Stanley Dean Witter Multi-Class Fund from the Exchange
Fund, with no CDSC being imposed on such exchange. The holding period previously
frozen when shares were first exchanged for shares of the Exchange Fund resumes
on the last day of the month in which shares of a Morgan Stanley Dean Witter
Multi-Class Fund are reacquired. A CDSC is imposed only upon an ultimate
redemption, based upon the time (calculated as described above) the shareholder
was invested in a Morgan Stanley Dean Witter Multi-Class Fund. 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 a FSC Fund.
 
    When shares initially purchased in a Morgan Stanley Dean Witter Multi-Class
Fund are exchanged for shares of a Morgan Stanley Dean Witter Multi-Class Fund,
shares of a FSC Fund, or shares of an Exchange Fund, the date of purchase of the
shares of the fund exchanged into, for purposes of the CDSC upon redemption,
will be the last day of the month in which the shares being exchanged were
originally purchased. In allocating the purchase payments between funds for
purposes of the CDSC, the amount which represents the current net asset value of
shares at the time of the exchange which were (i) purchased more than one, three
or six years (depending on the CDSC schedule applicable to the shares) prior to
the exchange, (ii) originally acquired through reinvestment of dividends or
distributions and (iii) acquired in exchange for shares of FSC Funds, or for
shares of other Morgan Stanley Dean Witter Funds for which shares of FSC Funds
have been exchanged (all such shares called "Free Shares"), will be exchanged
first. After an exchange, all dividends earned on shares in an Exchange Fund
will be considered Free Shares. If the exchanged amount exceeds the value of
such Free Shares, an exchange is made, on a block-by-block basis, of non-Free
Shares held for the longest period of time (except that, with respect to Class B
shares, if shares held for identical periods of time but subject to different
CDSC schedules are held in the same Exchange Privilege account, the shares of
that block that are subject to a lower CDSC rate will be exchanged prior to the
shares of that block that are subject to a higher CDSC rate). Shares equal to
any appreciation in the value of non-Free Shares exchanged will be treated as
Free Shares, and the amount of the purchase payments for the non-Free Shares of
the fund exchanged into will be equal to the lesser of (a) the purchase payments
for, or (b) the current net asset value of, the exchanged non-Free Shares. If an
exchange between funds would result in exchange of only part of a particular
block of non-Free Shares, then shares equal to any appreciation in the value of
the block (up to the amount of the exchange) will be treated as Free Shares and
exchanged first, and the
 
                                       41
<PAGE>
purchase payment for that block will be allocated on a pro rata basis between
the non-Free Shares of that block to be retained and the non-Free Shares to be
exchanged. The prorated amount of such purchase payment attributable to the
retained non-Free Shares will remain as the purchase payment for such shares,
and the amount of purchase payment for the exchanged non-Free Shares will be
equal to the lesser of (a) the prorated amount of the purchase payment for, or
(b) the current net asset value of, those exchanged non-Free Shares. Based upon
the procedures described in the Prospectus under the caption "Purchase of Fund
Shares," any applicable CDSC will be imposed upon the ultimate redemption of
shares of any fund, regardless of the number of exchanges since those shares
were originally purchased.
 
    With respect to the redemption or repurchase of shares of the Fund, the
application of proceeds to the purchase of new shares in the Fund or any other
of the funds and the general administration of the Exchange Privilege, the
Transfer Agent acts as agent for the Distributor and for the shareholder's
selected broker-dealer, if any, in the performance of such functions. With
respect to exchanges, redemptions or repurchases, the Transfer Agent shall be
liable for its own negligence and not for the default or negligence of its
correspondents or for losses in transit. The Fund shall not be liable for any
default or negligence of the Transfer Agent, the Distributor or any selected
broker-dealer.
 
    The Distributor and any selected broker-dealer have authorized and appointed
the Transfer Agent to act as their agent in connection with the application of
proceeds of any redemption of Fund shares to the purchase of shares of any other
fund and the general administration of the Exchange Privilege. No commission or
discounts will be paid to the Distributor or any selected broker-dealer for any
transactions pursuant to this Exchange Privilege.
 
    Exchanges are subject to the minimum investment requirement and any other
conditions imposed by each fund. (The minimum initial investment for the
Exchange Privilege account of each Class is $5,000 for Morgan Stanley Dean
Witter Liquid Asset Fund Inc., Morgan Stanley Dean Witter Tax-Free Daily Income
Trust, Morgan Stanley Dean Witter California Tax-Free Daily Income Trust and
Morgan Stanley Dean Witter New York Municipal Money Market Trust, although those
funds may, in their discretion, accept initial investments of as low as $1,000.
The minimum initial investment for the Exchange Privilege account of each Class
is $10,000 for Morgan Stanley Dean Witter Short-Term U.S. Treasury Trust,
although that fund, in its discretion, may accept initial purchases of as low as
$5,000. The minimum initial investment for the Exchange Privilege account of
each Class is $5,000 for Morgan Stanley Dean Witter Special Value Fund. The
minimum initial investment for the Exchange Privilege account of each Class of
all other Morgan Stanley Dean Witter Funds for which the Exchange Privilege is
available is $1,000.) Upon exchange into an Exchange Fund, the shares of that
fund will be held in a special Exchange Privilege Account separately from
accounts of those shareholders who have acquired their shares directly from that
fund. As a result, certain services normally available to shareholders of those
funds, including the check writing feature, will not be available for funds held
in that account.
 
    The Fund and each of the other Morgan Stanley Dean Witter Funds may limit
the number of times this Exchange Privilege may be exercised by any investor
within a specified period of time. Also, the Exchange Privilege may be
terminated or revised at any time by the Fund and/or any of the 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 (presently sixty
days' prior written notice for termination or material revision), provided that
six months' prior written notice of termination will be given to the
shareholders who hold shares of Exchange Funds pursuant to the Exchange
Privilege, and provided further that the Exchange Privilege may be terminated or
materially revised without notice at times (a) when the New York Stock Exchange
is closed for other than customary weekends and holidays, (b) when trading on
that Exchange is restricted, (c) when an emergency exists as a result of which
disposal by the Fund of securities owned by it is not reasonably practicable or
it is not reasonably practicable for the Fund fairly to determine the value of
its net assets, (d) during any other period when the Securities and Exchange
Commission by order so permits (provided that applicable rules and
 
                                       42
<PAGE>
regulations of the Securities and Exchange Commission shall govern as to whether
the conditions prescribed in (b) or (c) exist) or (e) if the Fund would be
unable to invest amounts effectively in accordance with its investment
objective, policies and restrictions.
 
    For further information regarding the Exchange Privilege, shareholders
should contact their Morgan Stanley Dean Witter Financial Advisor or other
selected broker-dealer representative or the Transfer Agent.
 
REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------
 
    REDEMPTION.  As stated in the Prospectus, shares of each Class of the Fund
can be redeemed for cash at any time at the net asset value per share next
determined; however, such redemption proceeds will be reduced by the amount of
any applicable CDSC. If shares are held in a shareholder's account without a
share certificate, a written request for redemption to the Fund's Transfer Agent
at P.O. Box 983, Jersey City, NJ 07303 is required. If certificates are held by
the shareholder, the shares may be redeemed by surrendering the certificates
with a written request for redemption. The share certificate, or an accompanying
stock power, and the request for redemption, must be signed by the shareholder
or shareholders exactly as the shares are registered. Each request for
redemption, whether or not accompanied by a share certificate, must be sent to
the Fund's Transfer Agent, which will redeem the shares at their net asset value
next computed (see "Purchase of Fund Shares" in the Prospectus) after it
receives the request, and certificate, if any, in good order. Any redemption
request received after such computation will be redeemed at the next determined
net asset value. The term good order means that the share certificate, if any,
and request for redemption are properly signed, accompanied by any documentation
required by the Transfer Agent, and bear signature guarantees when required by
the Portfolio or the Transfer Agent. If redemption is requested by a
corporation, partnership, trust or fiduciary, the Transfer Agent may require
that written evidence of authority acceptable to the Transfer Agent be submitted
before such request is accepted.
 
    Whether certificates are held by the shareholder or shares are held in a
shareholder's account, if the proceeds are to be paid to any person other than
the record owner, or if the proceeds are to be paid to a corporation (other than
the Distributor or a selected broker-dealer for the account of the shareholder),
partnership, trust or fiduciary, or sent to the shareholder at an address other
than the registered address, signatures must be guaranteed by an eligible
guarantor acceptable to the Transfer Agent (shareholders should contact the
Transfer Agent for a determination as to whether a particular institution is
such an eligible guarantor). A stock power may be obtained from any dealer or
commercial bank. The Fund may change the signature guarantee requirements from
time to time upon notice to shareholders, which may be by means of a new
prospectus.
 
    REPURCHASE.  As stated in the Prospectus, 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 request of the
shareholder. The repurchase price is the net asset value next computed after
such purchase order is received by DWR or other selected broker-dealer reduced
by any applicable CDSC.
 
    PAYMENT FOR SHARES REDEEMED OR REPURCHASED.  As discussed in the Prospectus,
payment for shares of any Class 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 at times (a) when the New York Stock
Exchange is closed for other than customary weekends and holidays, (b) when
trading on that Exchange is restricted, (c) when an emergency exists as a result
of which disposal by the Portfolio of securities owned by it is not reasonably
practicable or it is not reasonably practicable for the Fund fairly to determine
the value of its net assets, or (d) during any other period when the Securities
and Exchange Commission by order so permits; provided that applicable rules and
regulations of the Securities and Exchange Commission shall govern as to whether
the conditions prescribed in (b) or (c) exist. If the
 
                                       43
<PAGE>
shares to be redeemed have recently been purchased by check (including a
certificate or bank cashier's check), payment of 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). It is the Fund's policy and practice that, if
checks for redemption proceeds remain uncashed, no interest will accrue on
amounts represented by such uncashed checks. 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.
 
    TRANSFERS OF SHARES.  In the event a shareholder requests a transfer of any
shares to a new registration, such shares will be transferred without sales
charge at the time of transfer. With regard to the status of shares which are
either subject to the CDSC or free of such charge (and with regard to the length
of time shares subject to the charge have been held), any transfer involving
less than all the shares in an account will be made on a pro rata basis (that
is, by transferring shares in the same proportion that the transferred shares
bear to the total shares in the account immediately prior to the transfer). The
transferred shares will continue to be subject to any applicable CDSC as if they
had not been so transferred.
 
    REINSTATEMENT PRIVILEGE.  As discussed in the Prospectus, 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 at the net
asset value next determined after a reinstatement request, together with such
proceeds, is received by the Transfer Agent.
 
    Exercise of the reinstatement privilege will not affect the federal income
tax treatment of any gain or loss realized upon the redemption or repurchase,
except that if the redemption or repurchase resulted in a loss and reinstatement
is made in shares of the Fund, some or all of the loss, depending on the amount
reinstated, will not be allowed as a deduction for federal income tax purposes
but will be applied to adjust the cost basis of the shares acquired upon
reinstatement.
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
    As discussed in the Prospectus, the Fund will determine either to distribute
or to retain all or part of any net long-term capital gains in any year for
reinvestment. If any such gains are retained, the Fund will pay federal income
tax thereon, and will notify shareholders that, following an election by the
Fund, the shareholders will be required to include such undistributed gains in
determining their taxable income and may claim their share of the tax paid by
the Fund as a credit against their individual federal income tax.
 
    Because the Fund intends to distribute all of its net investment income and
capital gains to shareholders and otherwise continue to 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.
Shareholders will normally have to pay federal income taxes, and any state
income taxes, on the dividends and distributions they receive from the Fund.
Such dividends and distributions, to the extent that they are derived from net
investment income or short-term capital gains, are taxable to the shareholder as
ordinary income regardless of whether the shareholder receives such payments in
additional shares or in cash. 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 received by the shareholder in the prior calendar 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. The Taxpayer Relief Act reduces the maximum
tax on long-term capital
 
                                       44
<PAGE>
gains from 28% to 20%. The lower rates do not apply to collectibles and certain
other assets. Additionally, the maximum capital gain rate for assets that are
held more than 5 years and that are acquired after December 31, 2000 is 18%.
 
    Any ordinary income dividends or capital gains distributions received by a
shareholder from any investment company will have the effect of reducing the net
asset value of the shareholder's shares in that company by the exact amount of
the dividend or capital gains distribution. Furthermore, capital gains
distributions and ordinary income dividends are subject to federal income taxes.
If the net asset value of the shares should be reduced below a shareholder's
cost as a result of the payment of dividends or realized long-term capital
gains, such payment would be in part a return of the shareholder's investment to
the extent of such reduction below the shareholder's cost, but nonetheless would
be taxable to the shareholder. Therefore, an investor should consider the tax
implications of purchasing Fund shares immediately prior to a dividend or
distribution record date.
 
    Dividend payments will be eligible for the federal dividends received
deduction available to the Fund's corporate shareholders only to the extent the
aggregate dividends received by the Fund would be eligible for the deduction if
the Fund were the shareholder claiming the dividends received deduction. The
amount of dividends paid by the Fund which may qualify for the dividends
received deduction is limited to the aggregate amount of qualifying dividends
which the Fund derives from its portfolio investments which the Fund has held
for a minimum period, usually 46 days within a 90 day period beginning 45 days
before the ex-dividend date of each qualifying dividend. Shareholders must meet
a similar holding period requirement with respect to their shares to claim the
dividends received deduction with respect to any distribution of qualifying
dividends. Any long-term capital gain distributions will also not be eligible
for the dividends received deduction. The ability to take the dividends received
deduction will also be limited in the case of a Fund shareholder which incurs or
continues indebtedness which is directly attributable to its investment in the
Fund.
 
    After the end of the year, shareholders will be sent full information on
their dividends and capital gains distributions for tax purposes, including
information as to the portion taxable as ordinary income, the portion taxable as
long-term capital gains and the portion eligible for the dividends received
deduction. 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 are urged to consult their attorneys or tax advisors regarding
specific questions as to federal, state or local taxes.
 
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
    As discussed in the Prospectus, 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 Fund's
"average annual total return" represents an annualization of the Fund's total
return over a specified period and is computed by finding the annual percentage
rate which will result in the ending redeemable value of a hypothetical $1,000
investment made at the beginning of a one, five or ten year period, or for the
period from the date of commencement of the Fund's operations, if shorter than
any of the foregoing. The ending redeemable value is reduced by any CDSC at the
end of the one, five or ten year or other period. For the purpose of this
calculation, it is assumed that all dividends and distributions are reinvested.
The formula for computing the average annual total return involves a percentage
obtained by dividing the ending redeemable value by the amount of the initial
investment, taking a root of the quotient (where the root is equivalent to the
number of years in the period) and subtracting 1 from the result.
 
    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,
year-by-year or other types of total return figures. Such calculations may or
may not reflect the imposition of the maximum front-end sales charge for Class A
or
 
                                       45
<PAGE>
the deduction of the CDSC for each of Class B and Class C which, if reflected,
would reduce the performance quoted. For example, the average annual total
return of the Fund may be calculated in the manner described in the preceding
paragraph, but without deduction for any applicable sales charge.
 
    In addition, the Fund may compute its aggregate total return for each Class
for specified periods by determining the aggregate percentage rate which will
result in the ending value of a hypothetical $1,000 investment made at the
beginning of the period. For the purpose of this calculation, it is assumed that
all dividends and distributions are reinvested. The formula for computing
aggregate total return involves a percentage obtained by dividing the ending
value (without reduction for any sales charge) by the initial $1,000 investment
and subtracting 1 from the result.
 
    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 by adding 1 to
the Fund's aggregate total return to date (expressed as a decimal and without
taking into account the effect of any applicable CDSC) and multiplying by
$9,475, $48,000 and $97,000 in the case of Class A (investments of $10,000,
$50,000 and $100,000 adjusted for the initial sales charge) or by $10,000,
$50,000 and $100,000 in the case of each of Class B, Class C and Class D, as the
case may be.
 
    The Fund from time to time may also advertise its performance relative to
certain performance rankings and indexes compiled by independent organizations.
 
DESCRIPTION OF SHARES OF THE FUND
- --------------------------------------------------------------------------------
 
    The shareholders of the Fund are entitled to a full vote for each full share
held. The Trustees themselves have the power to alter the number and the terms
of office of the Trustees, and they may at any time lengthen their own terms or
make their terms of unlimited duration and appoint their own successors,
provided that always at least a majority of the Trustees has been elected by the
shareholders of the Fund. Under certain circumstances the Trustees may be
removed by action of the Trustees. The shareholders also have the right under
certain circumstances to remove the Trustees. The voting rights of shareholders
are not cumulative, so that holders of more than 50 percent of the shares voting
can, if they choose, elect all Trustees being selected, while the holders of the
remaining shares would be unable to elect any Trustees.
 
    The Declaration of Trust permits the Trustees to authorize the creation of
additional series of shares (the proceeds of which would be invested in
separate, independently managed portfolios) and additional classes of shares
within any series. The Trustees have not authorized any such additional series
or classes of shares other than as set forth in the Prospectus.
 
    The Declaration of Trust provides that no Trustee, officer, employee or
agent of the Fund is liable to the Fund or to a shareholder, nor is any Trustee,
officer, employee or agent liable to any third persons in connection with the
affairs of the Fund, except as such liability may arise from his/her or its own
bad faith, willful misfeasance, gross negligence, or reckless disregard of
his/her or its duties. It also provides that all third persons shall look solely
to the Fund property for satisfaction of claims arising in connection with the
affairs of the Fund. With the exceptions stated above, the Declaration of Trust
provides that a Trustee, officer, employee or agent is entitled to be
indemnified against all liability in connection with the affairs of the Fund.
 
    The Fund is authorized to issue an unlimited number of shares of beneficial
interest. The Fund shall be of unlimited duration, subject to the provisions in
the Declaration of Trust concerning termination by action of the shareholders.
 
CUSTODIAN AND TRANSFER AGENT
- --------------------------------------------------------------------------------
 
    The Bank of New York, 90 Washington Street, New York, New York 10286 is the
Custodian of the Fund's assets. Any of the Fund's cash balances with the
Custodian in excess of $100,000 are unprotected by federal deposit insurance.
Such balances may, at times, be substantial.
 
                                       46
<PAGE>
    Morgan Stanley Dean Witter Trust FSB ("MSDW Trust"), Harborside Financial
Center, Plaza Two, Jersey City, New Jersey 07311 is the Transfer Agent of the
Fund's shares and Dividend Disbursing Agent for payment of dividends and
distributions on Fund shares and Agent for shareholders under various investment
plans described herein. MSDW Trust is an affiliate of Morgan Stanley Dean Witter
Advisors Inc., the Fund's Investment Manager, and of Morgan Stanley Dean Witter
Distributors Inc., the Fund's Distributor. As Transfer Agent and Dividend
Disbursing Agent, MSDW Trust's responsibilities include maintaining shareholder
accounts, disbursing cash dividends and reinvesting dividends, processing
account registration changes, handling purchase and redemption transactions,
mailing prospectuses and reports, mailing and tabulating proxies, processing
share certificate transactions, and maintaining shareholder records and lists.
For these services MSDW Trust receives a per shareholder account fee.
 
INDEPENDENT ACCOUNTANTS
- --------------------------------------------------------------------------------
 
    PricewaterhouseCoopers LLP serves as the independent accountants of the
Fund. The independent accountants are responsible for auditing the annual
financial statements of the Fund.
 
REPORTS TO SHAREHOLDERS
- --------------------------------------------------------------------------------
 
    The Fund will send to shareholders, at least semi-annually, reports showing
the Fund's portfolio and other information. An annual report containing
financial statements audited by independent accountants will be sent to
shareholders each year.
 
    The Fund's fiscal year ends on July 31. The financial statements of the Fund
must be audited at least once a year by independent accountants whose selection
is made annually by the Fund's Board of Trustees.
 
LEGAL COUNSEL
- --------------------------------------------------------------------------------
 
    Barry Fink, Esq., who is an officer and the General Counsel of the
Investment Manager, is an officer and the General Counsel of the Fund.
 
EXPERTS
- --------------------------------------------------------------------------------
 
    The Statement of Assets and Liabilities of the Fund at November 6, 1998
included in this Statement of Additional Information and incorporated by
reference in the Prospectus has been so included and incorporated in reliance on
the report of PricewaterhouseCoopers LLP, independent accountants, given on the
authority of said firm as experts in auditing and accounting.
 
REGISTRATION STATEMENT
- --------------------------------------------------------------------------------
 
    This Statement of Additional Information and the Prospectus do not contain
all of the information set forth in the Registration Statement the Fund has
filed with the Securities and Exchange Commission. The complete Registration
Statement may be obtained from the Securities and Exchange Commission upon
payment of the fee prescribed by the rules and regulations of the Commission.
 
                                       47
<PAGE>
MORGAN STANLEY DEAN WITTER AGGRESSIVE EQUITY FUND
STATEMENT OF ASSETS AND LIABILITIES AT NOVEMBER 6, 1998
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                              <C>
ASSETS:
  Cash.........................................................................  $ 100,000
  Deferred offering costs (Note 1).............................................    178,000
                                                                                 ---------
      Total Assets.............................................................    278,000
                                                                                 ---------
LIABILITIES:
  Offering costs payable (Note 1)..............................................    178,000
  Commitments (Notes 1 and 2)..................................................     -0-
                                                                                 ---------
      Total Liabilities........................................................    178,000
                                                                                 ---------
      Net Assets...............................................................  $ 100,000
                                                                                 ---------
                                                                                 ---------
CLASS A SHARES:
Net Assets.....................................................................  $  25,000
Shares Outstanding (unlimited authorized, $.01 par value)......................      2,500
    NET ASSET VALUE PER SHARE..................................................  $   10.00
                                                                                 ---------
                                                                                 ---------
    MAXIMUM OFFERING PRICE PER SHARE
      (net asset value plus 5.5% of net asset value)...........................  $   10.55
                                                                                 ---------
                                                                                 ---------
CLASS B SHARES:
Net Assets.....................................................................  $  25,000
Shares Outstanding (unlimited authorized, $.01 par value)......................      2,500
    NET ASSET VALUE PER SHARE..................................................  $   10.00
                                                                                 ---------
                                                                                 ---------
CLASS C SHARES:
Net Assets.....................................................................  $  25,000
Shares Outstanding (unlimited authorized, $.01 par value)......................      2,500
    NET ASSET VALUE PER SHARE..................................................  $   10.00
                                                                                 ---------
                                                                                 ---------
CLASS D SHARES:
Net Assets.....................................................................  $  25,000
Shares Outstanding (unlimited authorized, $.01 par value)......................      2,500
    NET ASSET VALUE PER SHARE..................................................  $   10.00
                                                                                 ---------
                                                                                 ---------
</TABLE>
 
- ------------
    NOTE 1--Morgan Stanley Dean Witter Aggressive Equity Fund (the "Fund") was
organized as a Massachusetts business trust on October 29, 1997 under the name
Dean Witter Research Trust. To date the Fund has had no transactions other than
those relating to organizational matters and the sale of 2,500 shares of
beneficial interest for $25,000 of each class to Morgan Stanley Dean Witter
Advisors Inc. (the "Investment Manager"). The Fund is registered under the
Investment Company Act of 1940, as amended (the "Act"), as a diversified,
open-end management investment company. The investment objective of the Fund is
long-term capital growth. Estimated organizational expenses of the Fund in the
amount of approximately $17,000 incurred prior to the offering of the Fund's
shares will be absorbed by the Investment Manager. It is currently estimated
that the Investment Manager will incur, and be reimbursed, approximately
$178,000 by the Fund in offering costs. Actual costs could differ from these
estimates. Offering costs will be deferred and amortized by the Fund on the
straight-line method over the period of benefit of approximately one year or
less from the date of commencement of the Fund's operations.
 
    NOTE 2--The Fund has entered into an investment management agreement with
the Investment Manager. Certain officers and/or trustees of the Fund are
officers and/or directors of the Investment Manager. The Fund has retained the
Investment Manager to manage the investment of the Fund's assets, including the
placing of orders for the purchase and sale of portfolio securities. Under the
terms
 
                                       48
<PAGE>
of the Investment Management Agreement, the Investment Manager maintains certain
of the Fund's books and records and furnishes, at its own expense, such office
space, facilities, equipment, supplies, clerical help and bookkeeping and
certain legal services as the Fund may reasonably require in the conduct of its
business. In addition, the Investment Manager pays the salaries of all
personnel, including officers of the Fund, who are employees of the Investment
Manager. The Investment Manager also bears the cost of the Fund's telephone
service, heat, light, power and other utilities.
 
    As full compensation for the services and facilities furnished to the Fund
and expenses of the Fund incurred by the Investment Manager, the Fund will pay
the Investment Manager monthly compensation calculated daily by applying the
annual rate of 0.75% to the Fund's daily net assets.
 
    The Investment Manager has undertaken to assume all Fund expenses (except
for the 12b-1 fee and brokerage fees) and to waive the compensation provided for
in its investment management agreement for services rendered until such time as
the Fund has $50 million of net assets or until six months from the date of
commencement of the Fund's operations, whichever occurs first.
 
    Shares of the Fund will be distributed by Morgan Stanley Dean Witter
Distributors Inc. (the "Distributor"), an affiliate of the Investment Manager,
during the initial and continuous offering of the Fund's shares. The Fund has
adopted a Plan of Distribution pursuant to Rule 12b-1 under the Act (the "Plan")
with respect to the distribution of Class A, Class B and Class C shares of the
Fund. The Plan provides that the Distributor will bear the expense of all
promotional and distribution related activities on behalf of those shares,
including the payment of commissions for sales of such shares 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,
with respect to Class B, the Distributor may utilize fees paid pursuant to the
Plan to compensate Dean Witter Reynolds Inc., an affiliate of the Investment
Manager and Distributor, and other selected broker-dealers for their opportunity
costs in advancing such amounts, which compensation would be in the form of a
carrying charge on any unreimbursed distribution expenses incurred.
 
    To compensate the Distributor for the services provided and for the expenses
borne by the Distributor and others under the Plan, Class A, Class B and Class C
will pay the Distributor compensation accrued daily and payable monthly at the
annual rate of up to 0.25% of the average daily net assets of Class A; 1.00% of
the average daily net assets of Class B; and up to 1.00% of the average daily
net assets of Class C. In the case of Class B Shares, provided that the Plan
continues in effect, any cumulative expenses incurred by the Distributor but not
yet recovered may be recovered through the payment of future distribution fees
from the Fund pursuant to the Plan and contingent deferred sales charges paid by
investors upon redemption of Class B shares. 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 contingent deferred sales
charges 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. In the case of Class A shares and Class C shares, expenses
incurred pursuant to the Plan in any calendar year in excess of 0.25% or 1.00%
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 credit to account executives may be
reimbursed in the subsequent calendar year.
 
    Morgan Stanley Dean Witter Trust FSB (the "Transfer Agent"), an affiliate of
the Investment Manager and the Distributor, is the transfer agent of the Fund's
shares, dividend disbursing agent for payment of dividends and distributions on
Fund shares and agent for shareholders under various investment plans.
 
                                       49
<PAGE>
REPORT OF INDEPENDENT ACCOUNTANTS
- --------------------------------------------------------------------------------
 
To the Shareholder and Trustees of
Morgan Stanley Dean Witter Aggressive Equity Fund
 
In our opinion, the accompanying statement of assets and liabilities presents
fairly, in all material respects, the financial position of Morgan Stanley Dean
Witter Aggressive Equity Fund (hereafter referred to as the "Fund") at November
6, 1998, in conformity with generally accepted accounting principles. This
financial statement is the responsibility of the Fund's management; our
responsibility is to express an opinion on this financial statement based on our
audit. We conducted our audit of this financial statement in accordance with
generally accepted auditing standards which require that we plan and perform the
audit to obtain reasonable assurance about whether the financial statement is
free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures in the financial statement,
assessing the accounting principles used and significant estimates made by
management, and evaluating the overall financial statement presentation. We
believe that our audit provides a reasonable basis for the opinion expressed
above.
 
PricewaterhouseCoopers LLP
1177 Avenue of the Americas
New York, New York 10036
November 9, 1998
 
                                       50
<PAGE>
APPENDIX
- --------------------------------------------------------------------------------
 
RATINGS OF CORPORATE DEBT INSTRUMENTS INVESTMENTS
 
MOODY'S INVESTORS SERVICE INC. ("MOODY'S")
 
                         FIXED-INCOME SECURITY RATINGS
 
<TABLE>
<S>        <C>
Aaa        Fixed-income securities which are rated Aaa are judged to be of the best quality.
           They carry the smallest degree of investment risk and are generally referred to as
           "gilt edge." Interest payments are protected by a large or by an exceptionally
           stable margin and principal is secure. While the various protective elements are
           likely to change, such changes as can be visualized are most unlikely to impair the
           fundamentally strong position of such issues.
 
Aa         Fixed-income securities which are rated Aa are judged to be of high quality by all
           standards. Together with the Aaa group they comprise what are generally known as
           high grade bonds. They are rated lower than the best bonds because margins of
           protection may not be as large as in Aaa securities or fluctuation of protective
           elements may be of greater amplitude or there may be other elements present which
           make the long-term risks appear somewhat larger than in Aaa securities.
 
A          Fixed-income securities which are rated A possess many favorable investment
           attributes and are to be considered as upper medium grade obligations. Factors
           giving security to principal and interest are considered adequate, but elements may
           be present which suggest a susceptibility to impairment sometime in the future.
 
Baa        Fixed-income securities which are rated Baa are considered as medium grade
           obligations; i.e., they are neither highly protected nor poorly secured. Interest
           payments and principal security appear adequate for the present but certain
           protective elements may be lacking or may be characteristically unreliable over any
           great length of time. Such fixed-income securities lack outstanding investment
           characteristics and in fact have speculative characteristics as well.
 
           Fixed-income securities rated Aaa, Aa, A and Baa are considered investment grade
           bonds.
 
Ba         Fixed-income securities which are rated Ba are judged to have speculative elements;
           their future cannot be considered as well assured. Often the protection of interest
           and principal payments may be very moderate, and therefore not well safeguarded
           during both good and bad times over the future. Uncertainty of position
           characterizes bonds in this class.
 
B          Fixed-income securities which are rated B generally lack characteristics of
           desirable investments. Assurance of interest and principal payments or of
           maintenance of other terms of the contract over any long period of time may be
           small.
 
Caa        Fixed-income securities which are rated Caa are of poor standing. Such issues may
           be in default or there may be present elements of danger with respect to principal
           or interest.
 
Ca         Fixed-income securities which are rated Ca represent obligations which are
           speculative in a high degree. Such issues are often in default or have other marked
           shortcomings.
 
C          Fixed-income securities which are rated C are the lowest rated class of bonds, and
           issues so rated can be regarded as having extremely poor prospects of ever
           attaining any real investment standing.
</TABLE>
 
    RATING REFINEMENTS: Moody's may apply numerical modifiers, 1, 2, and 3 in
each generic rating classification from Aa through B in its corporate and
municipal bond rating system. The modifier 1 indicates that the security ranks
in the higher end of its generic rating category; the modifier 2 indicates a
mid-range ranking; and a modifier 3 indicates that the issue ranks in the lower
end of its generic rating category.
 
                                       51
<PAGE>
                            COMMERCIAL PAPER RATINGS
 
    Moody's Commercial Paper ratings are opinions of the ability to repay
punctually promissory obligations not having an original maturity in excess of
nine months. Moody's employs the following three designations, all judged to be
investment grade, to indicate the relative repayment capacity of rated issuers:
Prime-1, Prime-2, Prime-3.
 
    Issuers rated Prime-1 have a superior capacity for repayment of short-term
promissory obligations. Issuers rated Prime-2 have a strong capacity for
repayment of short-term promissory obligations; and Issuers rated Prime-3 have
an acceptable capacity for repayment of short-term promissory obligations.
Issuers rated Not Prime do not fall within any of the Prime rating categories.
 
STANDARD & POOR'S CORPORATION ("STANDARD & POOR'S")
 
                                  BOND RATINGS
 
    A Standard & Poor's bond rating is a current assessment of the
creditworthiness of an obligor with respect to a specific obligation. This
assessment may take into consideration obligors such as guarantors, insurers, or
lessees.
 
    The ratings are based on current information furnished by the issuer or
obtained by Standard & Poor's from other sources it considers reliable. The
ratings are based, in varying degrees, on the following considerations: (1)
likelihood of default-capacity and willingness of the obligor as to the timely
payment of interest and repayment of principal in accordance with the terms of
the obligation; (2) nature of and provisions of the obligation; and (3)
protection afforded by, and relative position of, the obligation in the event of
bankruptcy, reorganization or other arrangement under the laws of bankruptcy and
other laws affecting creditors' rights.
 
    Standard & Poor's does not perform an audit in connection with any rating
and may, on occasion, rely on unaudited financial information. The ratings may
be changed, suspended or withdrawn as a result of changes in, or unavailability
of, such information, or for other reasons.
 
<TABLE>
<S>        <C>
AAA        Debt rated AAA has the highest rating assigned by Standard & Poor's. Capacity to
           pay interest and repay principal is extremely strong.
 
AA         Debt rated AA has a very strong capacity to pay interest and repay principal and
           differs from the highest-rated issues only in small degree.
 
A          Debt rated A has a strong capacity to pay interest and repay principal although
           they are somewhat more susceptible to the adverse effects of changes in
           circumstances and economic conditions than debt in higher-rated categories.
 
BBB        Debt rated BBB is regarded as having an adequate capacity to pay interest and repay
           principal. Whereas it normally exhibits adequate protection parameters, adverse
           economic conditions or changing circumstances are more likely to lead to a weakened
           capacity to pay interest and repay principal for debt in this category than for
           debt in higher-rated categories.
 
           Bonds rated AAA, AA, A and BBB are considered investment grade bonds.
 
BB         Debt rated BB has less near-term vulnerability to default than other speculative
           grade debt. However, it faces major ongoing uncertainties or exposure to adverse
           business, financial or economic conditions which could lead to inadequate capacity
           to meet timely interest and principal payment.
 
B          Debt rated B has a greater vulnerability to default but presently has the capacity
           to meet interest payments and principal repayments. Adverse business, financial or
           economic conditions would likely impair capacity or willingness to pay interest and
           repay principal.
</TABLE>
 
                                       52
<PAGE>
<TABLE>
<S>        <C>
CCC        Debt rated CCC has a current identifiable vulnerability to default, and is
           dependent upon favorable business, financial and economic conditions to meet timely
           payments of interest and repayments of principal. In the event of adverse business,
           financial or economic conditions, it is not likely to have the capacity to pay
           interest and repay principal.
 
CC         The rating CC is typically applied to debt subordinated to senior debt which is
           assigned an actual or implied CCC rating.
 
C          The rating C is typically applied to debt subordinated to senior debt which is
           assigned an actual or implied CCC- debt rating.
 
CI         The rating CI is reserved for income bonds on which no interest is being paid.
 
D          Debt rated D is in default. The D rating is assigned on the day an interest or
           principal payment is missed.
 
NR         Indicates that no rating has been requested, that there is insufficient information
           on which to base a rating or that Standard & Poor's does not rate a particular type
           of obligation as a matter of policy.
</TABLE>
 
                            COMMERCIAL PAPER RATINGS
 
    Standard & Poor's commercial paper rating is a current assessment of the
likelihood of timely payment of debt having an original maturity of no more than
365 days. The commercial paper rating is not a recommendation to purchase or
sell a security. The ratings are based upon current information furnished by the
issuer or obtained by Standard & Poor's from other sources it considers
reliable. The ratings may be changed, suspended, or withdrawn as a result of
changes in or unavailability of such information. Ratings are graded into group
categories, ranging from "A" for the highest quality obligations to "D" for the
lowest. The categories are as follows:
 
    Issues assigned A ratings are regarded as having the greatest capacity for
timely payment. Issues in this category are further refined with the designation
1, 2 and 3 to indicate the relative degree of safety.
 
<TABLE>
<S>        <C>
A-1        indicates that the degree of safety regarding timely payment is very strong.
 
A-2        indicates capacity for timely payment on issues with this designation is strong.
           However, the relative degree of safety is not as overwhelming as for issues
           designated "A-1."
 
A-3        indicates a satisfactory capacity for timely payment. Obligations carrying this
           designation are, however, somewhat more vulnerable to the adverse effects of
           changes in circumstances than obligations carrying the higher designations.
</TABLE>
 
FITCH INVESTORS SERVICES, INC. ("FITCH")
 
                                  BOND RATINGS
 
    The Fitch Bond Ratings provides a guide to investors in determining the
investment risk associated with a particular security. The rating represents its
assessment of the issuer's ability to meet the obligations of a specific debt
issue or class of debt in a timely manner. Fitch bond ratings are not
recommendations to buy, sell or hold securities since they incorporate no
information on market price or yield relative to other debt instruments.
 
    The rating takes into consideration special features of the issue, its
relationship to other obligations of the issuer, the record of the issuer and of
any guarantor, as well as the political and economic environment that might
affect the future financial strength and credit quality of the issuer.
 
                                       53
<PAGE>
    Bonds which have the same rating are of similar but not necessarily
identical investment quality since the limited number of rating categories
cannot fully reflect small differences in the degree of risk. Moreover, the
character of the risk factor varies from industry to industry and between
corporate, health care and municipal issues.
 
    In assessing credit risk, Fitch Investors Service relies on current
information furnished by the Issuer and/or guarantor and other sources which it
considers reliable. Fitch does not perform an audit of the financial statements
used in assigning a rating.
 
    Ratings may be changed, withdrawn or suspended at any time to reflect
changes in the financial condition of the issuer, the status of the issue
relative to other debt of the issuer, or any other circumstances that Fitch
considers to have a material effect on the credit of the obligor.
 
<TABLE>
<S>        <C>
AAA        rated bonds are considered to be investment grade and of the highest credit
           quality. The obligor has an exceptionally strong ability to pay interest and repay
           principal, which is unlikely to be affected by reasonably foreseeable events.
 
AA         rated bonds are considered to be investment grade and of very high credit quality.
           The obligor's ability to pay interest and repay principal, while very strong, is
           somewhat less than for AAA rated securities or more subject to possible change over
           the term of the issue.
 
A          rated bonds are considered to be investment grade and of high credit quality. The
           obligor's ability to pay interest and repay principal is considered to be strong,
           but may be more vulnerable to adverse changes in economic conditions and
           circumstances than bonds with higher ratings.
 
BBB        rated bonds are considered to be investment grade and of satisfactory credit
           quality. The obligor's ability to pay interest and repay principal is considered to
           be adequate. Adverse changes in economic conditions and circumstances, however, are
           more likely to weaken this ability than bonds with higher ratings.
 
BB         rated bonds are considered speculative and of low investment grade. The obligor's
           ability to pay interest and repay principal is not strong and is considered likely
           to be affected over time by adverse economic changes.
 
B          rated bonds are considered highly speculative. Bonds in this class are lightly
           protected as to the obligor's ability to pay interest over the life of the issue
           and repay principal when due.
 
CCC        rated bonds may have certain identifiable characteristics which, if not remedied,
           could lead to the possibility of default in either principal or interest payments.
 
CC         rated bonds are minimally protected. Default in payment of interest and/or
           principal seems probable.
 
C          rated bonds are in imminent default in payment of interest or principal.
</TABLE>
 
                               SHORT-TERM RATINGS
 
    Fitch's short-term ratings apply to debt obligations that are payable on
demand or have original maturities of generally up to three years, including
commercial paper, certificates of deposit, medium-term notes, and municipal and
investment notes. Although the credit analysis is similar to Fitch's bond rating
analysis, the short-term rating places greater emphasis on the existence of
liquidity necessary to meet the issuer's obligations in a timely manner. Fitch's
short-term ratings are as follows:
 
<TABLE>
<S>        <C>
Fitch-1+   (Exceptionally Strong Credit Quality) Issues assigned this rating are regarded
           as having the strongest degree of assurance for timely payment.
 
Fitch-1    (Very Strong Credit Quality) Issues assigned this rating reflect an assurance
           of timely payment only slightly less in degree than issues rated Fitch-1+.
</TABLE>
 
                                       54
<PAGE>
<TABLE>
<S>        <C>
Fitch-2    (Good Credit Quality) Issues assigned this rating have a satisfactory degree of
           assurance for timely payment but the margin of safety is not as great as the
           two higher categories.
 
Fitch-3    (Fair Credit Quality) Issues assigned this rating have characteristics
           suggesting that the degree of assurance for timely payment is adequate,
           however, near-term adverse change is likely to cause these securities to be
           rated below investment grade.
 
Fitch-6    (Weak Credit Quality) Issues assigned this rating have characteristics
           suggesting a minimal degree of assurance for timely payment and are vulnerable
           to near-term adverse changes in financial and economic conditions.
 
D          (Default) Issues assigned this rating are in actual or imminent payment
           default.
 
LOC        This symbol LOC indicates that the rating is based on a letter of credit issued
           by a commercial bank.
</TABLE>
 
DUFF & PHELPS, INC.
 
                               LONG-TERM RATINGS
 
    These ratings represent a summary opinion of the issuer's long-term
fundamental quality. Rating determination is based on qualitative and
quantitative factors which may vary according to the basic economic and
financial characteristics of each industry and each issuer. Important
considerations are vulnerability to economic cycles as well as risks related to
such factors as competition, government action, regulation, technological
obsolescence, demand shifts, cost structure, and management depth and expertise.
The projected viability of the obligor at the trough of the cycle is a critical
determination.
 
    Each rating also takes into account the legal form of the security, (e.g.,
first mortgage bonds, subordinated debt, preferred stock, etc.). The extent of
rating dispersion among the various classes of securities is determined by
several factors including relative weightings of the different security classes
in the capital structure, the overall credit strength of the issuer, and the
nature of covenant protection. Review of indenture restrictions is important to
the analysis of a company's operating and financial constraints.
 
    The Credit Rating Committee formally reviews all ratings once per quarter
(more frequently, if necessary).
 
<TABLE>
<CAPTION>
RATING SCALE    DEFINITION
- --------------  ------------------------------------------------------------------------------------------------
<S>             <C>
AAA             Highest credit quality. The risk factors are negligible, being only slightly more than risk-free
                U.S. Treasury debt.
 
AA+             High credit quality. Protection factors are strong. Risk is modest, but may vary slightly from
AA              time to time because of economic conditions.
AA-
 
A+              Protection factors are average but adequate. However, risk factors are more variable and greater
A               in periods of economic stress.
A-
 
BBB+            Below average protection factors but still considered sufficient for prudent investment.
BBB             Considerable variability in risk during economic cycles.
BBB-
 
BB+             Below investment grade but deemed likely to meet obligations when due. Present or prospective
BB              financial protection factors fluctuate according to industry conditions or company fortunes.
BB-             Overall quality may move up or down frequently within this category.
</TABLE>
 
                                       55
<PAGE>
<TABLE>
<CAPTION>
RATING SCALE    DEFINITION
- --------------  ------------------------------------------------------------------------------------------------
<S>             <C>
B+              Below investment grade and possessing risk that obligations will not be met when due. Financial
B               protection factors will fluctuate widely according to economic cycles, industry conditions
B-              and/or company fortunes. Potential exists for frequent changes in the quality rating within this
                category or into a higher or lower quality rating grade.
 
CCC             Well below investment grade securities. May be in default or have considerable uncertainty
                exists as to timely payment of principal, interest or preferred dividends. Protection factors
                are narrow and risk can be substantial with unfavorable economic industry conditions, and/or
                with unfavorable company developments.
 
DD              Defaulted debt obligations. Issuer failed to meet scheduled principal and/or interest payments.
 
DP              Preferred stock with dividend arrearages.
</TABLE>
 
                               SHORT-TERM RATINGS
 
    Duff & Phelps' short-term ratings are consistent with the rating criteria
utilized by money market participants. The ratings apply to all obligations with
maturities of under one year, including commercial paper, the uninsured portion
of certificates of deposit, unsecured bank loans, master notes, bankers
acceptances, irrevocable letters of credit and current maturities of long-term
debt. Asset-backed commercial paper is also rated according to this scale.
 
    Emphasis is placed on liquidity which is defined as not only cash from
operations, but also access to alternative sources of fund, including trade
credit, bank lines, and the capital markets. An important consideration is the
level of an obligor's reliance on short-term funds on an ongoing basis.
<TABLE>
<CAPTION>
A. CATEGORY 1:     HIGH GRADE
- -----------------  ---------------------------------------------------------------------------------------------
<S>                <C>
Duff 1+            Highest certainty of timely payment. Short-term liquidity, including internal operating
                   factors and/or access to alternative sources of funds, is outstanding, and safety is just
                   below risk-free U.S. Treasury short-term obligations.
 
Duff 1             Very high certainty of timely payment. Liquidity factors are excellent and supported by good
                   fundamental protection factors. Risk factors are minor.
 
Duff 1-            High certainty of timely payment. Liquidity factors are strong and supported by good
                   fundamental protection factors. Risk factors are very small.
 
<CAPTION>
 
B. CATEGORY 2:     GOOD GRADE
- -----------------  ---------------------------------------------------------------------------------------------
<S>                <C>
Duff 2             Good certainty of timely payment. Liquidity factors and company fundamentals are sound.
                   Although ongoing funding needs may enlarge total financing requirements, access to capital
                   markets is good. Risk factors are small.
<CAPTION>
 
C. CATEGORY 3:     SATISFACTORY GRADE
- -----------------  ---------------------------------------------------------------------------------------------
<S>                <C>
Duff 3             Satisfactory liquidity and other protection factors qualify issue as to investment grade.
                   Risk factors are larger and subject to more variation. Nevertheless, timely payment is
                   expected.
<CAPTION>
 
D. CATEGORY 4:     NON-INVESTMENT GRADE
- -----------------  ---------------------------------------------------------------------------------------------
<S>                <C>
Duff 4             Speculative investment characteristics. Liquidity is not sufficient to insure against
                   disruption in debt service. Operating factors and market access may be subject to a high
                   degree of variation.
<CAPTION>
 
E. CATEGORY 5:     DEFAULT
- -----------------  ---------------------------------------------------------------------------------------------
<S>                <C>
Duff 5             Issuer failed to meet scheduled principal and/or interest payments.
</TABLE>
 
                                       56


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