MORGAN STANLEY DEAN WITTER DIVIDEND GROWTH SECURITIES INC
497, 1998-07-06
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<PAGE>
                         MORGAN STANLEY DEAN WITTER
                         DIVIDEND GROWTH SECURITIES
                         PROSPECTUS--JUNE 24, 1998
 
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MORGAN STANLEY DEAN WITTER DIVIDEND GROWTH SECURITIES INC. (THE "FUND") IS AN
OPEN-END, DIVERSIFIED MANAGEMENT INVESTMENT COMPANY WHOSE INVESTMENT OBJECTIVE
IS TO PROVIDE REASONABLE CURRENT INCOME AND LONG-TERM GROWTH OF INCOME AND
CAPITAL. THE FUND INVESTS PRIMARILY IN COMMON STOCK OF COMPANIES WITH A RECORD
OF PAYING DIVIDENDS AND THE POTENTIAL FOR INCREASING DIVIDENDS. (SEE "INVESTMENT
OBJECTIVE AND POLICIES.")
 
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.")
 
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 June 24, 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.
 
<TABLE>
<CAPTION>
TABLE OF CONTENTS
 
<S>                                                 <C>
Prospectus Summary................................       2
 
Summary of Fund Expenses..........................       4
 
Financial Highlights..............................       5
 
The Fund and its Management.......................       8
 
Investment Objective and Policies.................       8
 
  Risk Considerations and
    Investment Practices..........................       9
 
Investment Restrictions...........................      11
 
Purchase of Fund Shares...........................      12
 
Shareholder Services..............................      20
 
Redemptions and Repurchases.......................      22
 
Dividends, Distributions and Taxes................      23
 
Performance Information...........................      23
 
Additional Information............................      24
</TABLE>
 
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
DIVIDEND GROWTH SECURITIES INC.
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, a Maryland corporation, is an open-end, diversified management investment
                company investing primarily in common stock of companies with a record of paying
                dividends and the potential for increasing dividends (see page 8).
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SHARES OFFERED  Shares of common stock with $0.01 par value (see page 24). The Fund offers four Classes
                of shares, each with a different combination of sales charges, ongoing fees and other
                features (see pages 12-19).
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MINIMUM         The minimum initial investment for each Class is $1,000 ($100 if the account is opened
PURCHASE        through EasyInvest-SM-). Class D shares are only available to persons investing $5
                million ($25 million for certain qualified 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 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 12).
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INVESTMENT      The investment objective of the Fund is to provide reasonable current income and
OBJECTIVE       long-term growth of income and capital.
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INVESTMENT      Morgan Stanley Dean Witter Advisors Inc., ("MSDW Advisors"), the Investment Manager of
MANAGER         the Fund, and its wholly-owned subsidiary, Morgan Stanley Dean Witter Services Company
                Inc., serve in various investment management, advisory, management and administrative
                capacities to 101 investment companies and other portfolios with assets of approximately
                $114.6 billion at May 31, 1998 (see page 8).
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MANAGEMENT FEE  The Investment Manager receives a monthly fee at an annual rate of 0.625 of 1% of daily
                net assets, scaled down on assets over $250 million. The fee should not be compared with
                fees paid by other investment companies without also considering applicable sales loads
                and distribution fees, including those noted below (see page 8).
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DISTRIBUTOR     Morgan Stanley Dean Witter Distributors Inc. (the "Distributor"). The Fund has adopted a
AND             distribution plan pursuant to Rule 12b-1 under the Investment Company Act (the "12b-1
DISTRIBUTION    Plan") with respect to the distribution fees paid by the Class A, Class B and Class C
FEE             shares of the Fund to the Distributor. The entire 12b-1 fee payable by Class A and a
                portion of the 12b-1 fee payable by each of Class B and Class C equal to 0.25% of the
                average daily net assets of the Class are currently each characterized as a service fee
                within the meaning of the National Association of Securities Dealers, Inc. guidelines.
                The remaining portion of the 12b-1 fee, if any, is characterized as an asset-based sales
                charge (see pages 12 and 18).
- -------------------------------------------------------------------------------------------------------
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 12, 14 and 18).
 
                - 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. A different CDSC schedule applies to investments by certain qualified plans.
</TABLE>
 
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2
<PAGE>
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<TABLE>
<S>             <C>
                Class B shares are also subject to a 12b-1 fee assessed at the annual rate of 1.0% of
                the lesser of: (a) the average daily net sales of the Fund's Class B shares since
                implementation of the 12b-1 Plan on July 2, 1984, or (b) the average daily net assets of
                Class B attributable to shares issued since implementation of the 12b-1 Plan. All shares
                of the Fund held prior to July 28, 1997 (other than shares which were purchased prior to
                July 2, 1984 (and, with respect to such shares, certain shares acquired through
                reinvestment of dividends and capital gains distributions) and the shares held by
                certain employee benefit plans established by Dean Witter Reynolds Inc. and its
                affiliate, SPS Transaction Services, Inc.) have been designated Class B shares. Shares
                which were purchased prior to July 2, 1984 (and, with respect to such shares, certain
                shares acquired through reinvestment of dividends and capital gains distributions) and
                shares held by those employee benefit plans prior to July 28, 1997 have been designated
                Class D shares. Shares held before May 1, 1997 that have been designated Class B shares
                will convert to Class A shares in May, 2007. In all other instances, Class B shares
                convert to Class A shares approximately ten years after the date of the original
                purchase (see pages 12, 16 and 18).
 
                - 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 (see pages 12, 17 and
                18).
 
                - Class D shares are offered only to investors meeting an initial investment minimum of
                $5 million ($25 million for certain qualified 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 12 and 18).
- -------------------------------------------------------------------------------------------------------
DIVIDENDS AND   Dividends from net investment income are paid quarterly; and distributions from net
CAPITAL GAINS   capital gains, if any, are distributed at least annually. The Fund may, however,
DISTRIBUTIONS   determine to retain all or part of any net long- term 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 20
                and 23).
- -------------------------------------------------------------------------------------------------------
REDEMPTION      Shares 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 22).
- -------------------------------------------------------------------------------------------------------
RISKS           The net asset value of the Fund's shares will fluctuate with changes in market value of
                portfolio securities. Dividends payable by the Fund will vary in relation to the amounts
                of dividends and interest earned on portfolio securities. Investors should review the
                investment objective and policies of the Fund carefully and consider their ability to
                assume the risks involved in purchasing shares of the Fund (see pages 9-11).
</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
- --------------------------------------------------------------------------------
 
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
expenses and fees for the fiscal year ended February 28, 1998.
 
<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.................................................................   0.37%       0.37%     0.37%       0.37%
12b-1 Fees (5) (6)..............................................................   0.25%       0.69%     1.00%       None
Other Expenses..................................................................   0.08%       0.08%     0.08%       0.08%
Total Fund Operating Expenses (7)...............................................   0.70%       1.14%     1.45%       0.45%
</TABLE>
 
- ---------------
(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) THERE WERE NO OUTSTANDING SHARES OF CLASS A, CLASS C OR CLASS D PRIOR TO
    JULY 28, 1997. ACCORDINGLY, "TOTAL FUND OPERATING EXPENSES," AS SHOWN ABOVE
    WITH RESPECT TO THOSE CLASSES, ARE ESTIMATES BASED UPON THE SUM OF 12b-1
    FEES, MANAGEMENT FEES AND ESTIMATED "OTHER EXPENSES."
 
<TABLE>
<CAPTION>
                                                               3        5        10
EXAMPLES                                            1 YEAR   YEARS    YEARS    YEARS
                                                    ------   ------   ------   ------
<S>                                                 <C>      <C>      <C>      <C>
You would pay the following expenses on a $1,000
 investment assuming (1) a 5% annual return and
 (2) redemption at the end of each time period:
    Class A.......................................   $59      $74      $89      $135
    Class B.......................................   $62      $66      $83      $139
    Class C.......................................   $25      $46      $79      $174
    Class D.......................................   $ 5      $14      $25      $57
You would pay the following expenses on the same
 $1,000 investment assuming no redemption at the
 end of the period:
    Class A.......................................   $59      $74      $89      $135
    Class B.......................................   $12      $36      $63      $139
    Class C.......................................   $15      $46      $79      $174
    Class D.......................................   $ 5      $14      $25      $57
</TABLE>
 
THE ABOVE EXAMPLES SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE
EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF EACH CLASS 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>
FINANCIAL HIGHLIGHTS
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The following ratios and per share data for a share of capital stock outstanding
throughout each period have been audited by Price Waterhouse LLP, independent
accountants. The financial highlights should be read in conjunction with the
financial statements and notes thereto and the unqualified report of independent
accountants which are contained in the Statement of Additional Information.
Further information about the performance of the Fund is contained in the Fund's
Annual Report to Stockholders, which may be obtained without charge upon request
to the Fund.
 
<TABLE>
<CAPTION>
                                                            FOR THE YEAR ENDED FEBRUARY 28,
                           -------------------------------------------------------------------------------------------------
CLASS B SHARES             1998*++    1997     1996**     1995      1994      1993     1992**     1991      1990      1989
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
<S>                        <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>       <C>
PER SHARE OPERATING
 PERFORMANCE:
Net asset value,
 beginning
 of period...............  $46.60    $39.65    $31.16    $30.86    $28.70    $27.01    $23.50    $22.47    $20.32    $19.28
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Net investment
   income................    0.84      0.81      0.75      0.72      0.68      0.70      0.71      0.79      0.72      0.68
  Net realized and
   unrealized gain.......   12.50      7.55      8.50      0.24      2.16      1.72      3.63      1.04      2.83      1.78
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Total from investment
   operations............   13.34      8.36      9.25      0.96      2.84      2.42      4.34      1.83      3.55      2.46
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Less dividends and
   distributions from:
    Net investment
     income..............   (0.83)    (0.88)    (0.67)    (0.66)    (0.68)    (0.69)    (0.76)    (0.80)    (0.76)    (0.62)
    Net realized gain....   (0.75)    (0.53)    (0.09)       --        --     (0.04)    (0.07)       --     (0.64)    (0.80)
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Total dividends and
   distributions.........   (1.58)    (1.41)    (0.76)    (0.66)    (0.68)    (0.73)    (0.83)    (0.80)    (1.40)    (1.42)
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
  Net asset value, end of
   period................  $58.36    $46.60    $39.65    $31.16    $30.86    $28.70    $27.01    $23.50    $22.47    $20.32
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
                           -------   -------   -------   -------   -------   -------   -------   -------   -------   -------
TOTAL INVESTMENT
 RETURN+.................   29.10%    21.37%    30.01%     3.25%     9.98%     9.13%    18.82%     8.51%    17.85%    13.26%
  Ratios to average net
   Assets:
    Expenses.............    1.14%     1.22%     1.31%     1.42%     1.37%     1.40%     1.42%     1.51%     1.41%     1.55%
    Net investment
     income..............    1.61%     1.95%     2.14%     2.42%     2.31%     2.67%     2.91%     3.62%     3.46%     3.44%
 
SUPPLEMENTAL DATA:
  Net assets, end of
   period, in millions...  $16,989   $12,907   $9,782    $7,101    $6,712    $5,386    $4,071    $3,015    $2,760    $1,860
  Portfolio turnover
   rate..................       4%        4%       10%        6%       13%        8%        5%        5%        3%        8%
  Average commission rate
   paid..................  $0.0539   $0.0541       --        --        --        --        --        --        --        --
</TABLE>
 
- -------------
 * PRIOR TO JULY 28, 1997, THE FUND ISSUED ONE CLASS OF SHARES. ALL SHARES OF
   THE FUND HELD PRIOR TO THAT DATE, OTHER THAN SHARES WHICH WERE PURCHASED
   PRIOR TO JULY 2, 1984 (AND WITH RESPECT TO SUCH SHARES, CERTAIN SHARES
   ACQUIRED THROUGH REINVESTMENT OF DIVIDENDS AND CAPITAL GAINS DISTRIBUTIONS
   (COLLECTIVELY THE "OLD SHARES")) AND SHARES HELD BY CERTAIN EMPLOYEE BENEFIT
   PLANS ESTABLISHED BY DEAN WITTER REYNOLDS INC. AND ITS AFFILIATE, SPS
   TRANSACTION SERVICES, INC., HAVE BEEN DESIGNATED CLASS B SHARES. THE OLD
   SHARES AND SHARES HELD BY THOSE EMPLOYEE BENEFIT PLANS PRIOR TO JULY 28, 1997
   HAVE BEEN DESIGNATED CLASS D SHARES.
** YEAR ENDED FEBRUARY 29.
++ THE PER SHARE AMOUNTS WERE COMPUTED USING AN AVERAGE NUMBER OF SHARES
   OUTSTANDING.
 + DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE. CALCULATED BASED ON THE NET
   ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
 
                                                                               5
<PAGE>
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<TABLE>
<CAPTION>
                                                                         FOR THE PERIOD
                                                                         JULY 28, 1997*
                                                                            THROUGH
                                                                          FEBRUARY 28,
CLASS A SHARES                                                               1998++
                                                                        ----------------
<S>                                                                     <C>
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period..................................      $ 53.43
                                                                             ------
Net investment income.................................................         0.66
Net realized and unrealized gain......................................         5.22
                                                                             ------
Total from investment operations......................................         5.88
                                                                             ------
Less dividends and distributions from:
  Net investment income...............................................        (0.67)
  Net realized gain...................................................        (0.25)
                                                                             ------
Total dividends and distributions.....................................        (0.92)
                                                                             ------
Net asset value, end of period........................................      $ 58.39
                                                                             ------
                                                                             ------
TOTAL INVESTMENT RETURN+..............................................        11.15%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses..............................................................         0.70%(2)
Net investment income.................................................         2.09%(2)
SUPPLEMENTAL DATA:
Net assets, end of period, in millions................................          $85
Portfolio turnover rate...............................................            4%(1)
Average commission rate paid..........................................      $0.0539
 
CLASS C SHARES
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period..................................      $ 53.43
                                                                             ------
Net investment income.................................................         0.43
Net realized and unrealized gain......................................         5.21
                                                                             ------
Total from investment operations......................................         5.64
                                                                             ------
Less dividends and distributions from:
  Net investment income...............................................        (0.54)
  Net realized gain...................................................        (0.25)
                                                                             ------
Total dividends and distributions.....................................        (0.79)
                                                                             ------
Net asset value, end of period........................................      $ 58.28
                                                                             ------
                                                                             ------
TOTAL INVESTMENT RETURN+..............................................        10.68%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses..............................................................         1.45%(2)
Net investment income.................................................         1.37%(2)
SUPPLEMENTAL DATA:
Net assets, end of period, in millions................................          $51
Portfolio turnover rate...............................................            4%(1)
Average commission rate paid..........................................      $0.0539
</TABLE>
 
- -------------
 *  THE DATE SHARES WERE FIRST ISSUED.
++  THE PER SHARE AMOUNTS WERE COMPUTED USING AN AVERAGE NUMBER OF SHARES
    OUTSTANDING.
 +  DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE. CALCULATED BASED ON THE NET
    ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
(1) NOT ANNUALIZED.
(2) ANNUALIZED.
 
6
<PAGE>
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<TABLE>
<CAPTION>
                                                                         FOR THE PERIOD
                                                                         JULY 28, 1997*
                                                                            THROUGH
                                                                          FEBRUARY 28,
CLASS D SHARES                                                               1998++
                                                                        ----------------
<S>                                                                     <C>
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period..................................      $ 53.43
                                                                             ------
Net investment income.................................................         0.76
Net realized and unrealized gain......................................         5.20
                                                                             ------
Total from investment operations......................................         5.96
                                                                             ------
Less dividends and distributions from:
  Net investment income...............................................        (0.71)
  Net realized gain...................................................        (0.25)
                                                                             ------
Total dividends and distributions.....................................        (0.96)
                                                                             ------
Net asset value, end of period........................................      $ 58.43
                                                                             ------
                                                                             ------
 
TOTAL INVESTMENT RETURN+..............................................        11.31%(1)
 
RATIOS TO AVERAGE NET ASSETS:
Expenses..............................................................         0.45%(2)
Net investment income.................................................         2.39%(2)
 
SUPPLEMENTAL DATA:
Net assets, end of period, in millions................................         $365
Portfolio turnover rate...............................................            4%(1)
Average commission rate paid..........................................      $0.0539
</TABLE>
 
- -------------
 *  THE DATE SHARES WERE FIRST ISSUED.
 ++ THE PER SHARE AMOUNTS WERE COMPUTED USING AN AVERAGE NUMBER OF SHARES
    OUTSTANDING.
 +  CALCULATED BASED ON THE NET ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE
    PERIOD.
(1) NOT ANNUALIZED.
(2) ANNUALIZED.
 
                                                                               7
<PAGE>
THE FUND AND ITS MANAGEMENT
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Morgan Stanley Dean Witter Dividend Growth Securities Inc. (the "Fund")
(formerly named Dean Witter Dividend Growth Securities Inc.) is an open-end,
diversified management investment company incorporated in Maryland on December
22, 1980.
 
    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, which was incorporated in
July, 1992, 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 101 investment companies,
28 of which are listed on the New York Stock Exchange, with combined total
assets of approximately $110.3 billion at May 31, 1998. The Investment Manager
also manages portfolios of pension plans, other institutions and individuals
which aggregated approximately $4.3 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, including the placing of orders for the purchase and sale of portfolio
securities. MSDW Advisors has retained MSDW Services to perform the
aforementioned administrative services for the Fund. The Fund's Board of
Directors reviews the various services provided by the Investment Manager to
ensure that the Fund's general investment policies and programs are being
properly carried out and that administrative services are being provided to the
Fund in a satisfactory manner.
 
    As full compensation for the services and facilities furnished to the Fund
and for expenses of the Fund assumed by the Investment Manager, the Fund pays
the Investment Manager monthly compensation calculated daily at an annual rate
of 0.625% of the daily net assets of the Fund up to $250 million, scaled down at
various asset levels to 0.275% on assets over $15 billion. For the fiscal year
ended February 28, 1998, the Fund accrued total compensation to the Investment
Manager amounting to 0.37% of the Fund's average daily net assets and the total
expenses of Class B amounted to 1.14% of the average daily net assets of Class
B. Shares of Class A, Class C and Class D were first issued on July 28, 1997.
The expenses of the Fund include: the fee of the Investment Manager; the fee
pursuant to the Plan of Distribution (see "Purchase of Fund Shares"); taxes;
transfer agent, custodian and auditing fees; 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.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
The investment objective of the Fund is to provide reasonable current income and
long-term growth of income and capital. This objective is fundamental and may
not be changed without shareholder approval. There is no assurance that the
objective will be achieved. The Fund seeks to achieve its investment objective
primarily through investments in common stock of companies with a record of
paying dividends and the potential for increasing dividends. Net asset value of
the Fund's shares will fluctuate with changes in market values of portfolio
securities. The Fund will attempt to avoid speculative securities or those with
speculative characteristics.
 
SPECIFIC INVESTMENT POLICIES
 
The Fund has adopted the following specific policies which are not fundamental
investment policies and which may be changed by the Fund's Board of Directors:
 
    (1) Up to 30% of the value of the Fund's total assets may be invested in:
(a) convertible debt securities, convertible preferred securities, U.S.
Government securities (securities issued or guaranteed as to principal and
interest by the United States or its agencies and instrumentalities), investment
grade corporate debt securities and/or money market instruments when, in the
opinion of the Investment Manager, the projected total return on such securities
is equal to or greater than the expected total return on equity securities or
when such holdings might be expected to reduce the volatility of the portfolio
(for purposes of this provision, the term "total return" means the difference
between the cost of a security and the aggregate of its market value and income
earned); or (b) in money market instruments under any one or more of the
following circumstances: (i) pending investment of proceeds of sale of Fund
shares or of portfolio securities; (ii) pending settlement of purchases of
portfolio securities; or (iii) to maintain liquidity for the purpose of meeting
anticipated redemptions.
 
8
<PAGE>
    (2) Notwithstanding any of the foregoing limitations, the Fund may invest
more than 30% of its total assets in money market instruments to maintain,
temporarily, a "defensive" posture when, in the opinion of the Investment
Manager, it is advisable to do so because of economic or market conditions.
 
    The foregoing limitations will apply at the time of acquisition based on the
last determined value of the Fund's assets. Any subsequent change in any
applicable percentage resulting from fluctuations in value or other change in
total assets will not require elimination of any security from the portfolio.
The Fund may purchase securities on a when-issued or delayed delivery basis, may
purchase or sell securities on a forward commitment basis and may purchase
securities on a "when, as and if issued" basis.
 
REPURCHASE AGREEMENTS
 
The Fund may enter into repurchase agreements, which may be viewed as a type of
secured lending by the Fund, and which typically involve the acquisition by the
Fund of government securities or other 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.
 
RISK CONSIDERATIONS AND INVESTMENT PRACTICES
 
AMERICAN DEPOSITORY RECEIPTS.  The Fund may invest in ADRs. 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.
 
INVESTMENTS IN SECURITIES RATED BAA BY MOODY'S OR BBB BY S&P.  The Fund may
invest a portion of their assets in fixed-income securities rated at the time of
purchase Baa or better by Moody's Investors Service, Inc. ("Moody's") or BBB or
better by Standard & Poor's Corporation ("S&P"). Investments in fixed-income
securities rated either Baa by Moody's or BBB by S&P (the lowest credit ratings
designated "investment grade") may have speculative characteristics and,
therefore, changes in economic conditions or other circumstances are more likely
to weaken their capacity to make principal and interest payments than would be
the case with investments in securities with higher credit ratings. If a bond
held by the Fund is downgraded by a rating agency to a rating below Baa or BBB,
the Fund will retain such security in its portfolio until the Investment Manager
determines that it is practicable to sell the security without undue market or
tax consequences to the Fund. In the event that such downgraded securities
constitute 5% or more of the Fund's assets, the Investment Manager will seek to
sell immediately sufficient securities to reduce the total to below 5%.
 
INVESTMENTS IN FIXED-INCOME SECURITIES.  The Fund may invest a portion of its
assets in fixed-income securities. 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. Generally, higher yielding fixed-income securities are
subject to a credit risk to a greater extent than lower yielding fixed-income
securities. 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 generally decline, and when interest rates fall, prices
generally rise.
 
CONVERTIBLE SECURITIES.  The Fund may invest a portion of its assets 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).
 
    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.
 
    Because of the special nature of the Fund's permitted investments in lower
rated convertible securities, the Investment Manager must take account of
certain special considerations in assessing the risks associated with such
investments. The prices of lower rated securities have been found to be less
sensitive to changes in prevailing
 
                                                                               9
<PAGE>
interest rates than higher rated investments, but are likely to be more
sensitive to adverse economic changes or individual corporate developments.
During an economic downturn or substantial period of rising interest rates,
highly leveraged issuers may experience financial stress which would adversely
affect their ability to service their principal and interest payment
obligations, to meet their projected business goals or to obtain additional
financing. If the issuer of a lower rated convertible security owned by the Fund
defaults, the Fund may incur additional expenses to seek recovery. In addition,
periods of economic uncertainty and change can be expected to result in an
increased volatility of market prices of lower rated securities and a
corresponding volatility in the net asset value of a share of the Fund.
 
REPURCHASE AGREEMENTS.  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. In addition, 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.
 
PRIVATE PLACEMENTS AND RESTRICTED SECURITIES.  The Fund may invest up to 5% of
its total 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 restricted. (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 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 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 Directors 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 10% 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 the Fund, at a particular point in time, may be unable
to find qualified institutional buyers interested in purchasing securities.
 
ZERO COUPON SECURITIES.  A portion of the fixed-income securities purchased by
the Fund may be zero coupon securities. Such securities are purchased at a
discount from their face amount, giving the purchaser the right to receive their
full value at maturity. The interest earned on such securities is, implicitly,
automatically compounded and paid out at maturity. While such compounding at a
constant rate eliminates the risk of receiving lower yields upon reinvestment of
interest if prevailing interest rates decline, the owner of a zero coupon
security will be unable to participate in higher yields upon reinvestment of
interest received on interest-paying securities if prevailing interest rates
rise.
 
    A zero coupon security pays no interest to its holder during its life.
Therefore, to the extent the Fund invests in zero coupon securities, it will not
receive current cash available for distribution to shareholders. In addition,
zero coupon securities are subject to substantially greater price fluctuations
during periods of changing prevailing interest rates than are comparable
securities which pay interest on a current basis. Current federal tax law
requires that a holder (such as the Fund) of a zero coupon security accrue a
portion of the discount at which the security was purchased as income each year
even though the Fund receives no interest payments in cash on the security
during the year.
 
INVESTMENT IN REAL ESTATE INVESTMENT TRUSTS.  The Fund may invest in real estate
investment trusts, which pool investors' funds for investments primarily in
commercial real estate properties. Investment in real estate investment trusts
may be the most practical available means for the Fund to invest in the real
estate industry (the Fund is prohibited from investing in real estate directly).
As a shareholder in a real estate investment trust, the Fund would bear its
ratable share of the real estate investment trust's expenses, including its
advisory and administration fees. At the same time the Fund would continue to
pay its own investment management fees and other expenses as a result of which
the Fund and its stockholders in effect will be absorbing duplicate levels of
fees with respect to investments in real estate investment trusts.
 
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
 
10
<PAGE>
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 affected by computer failures throughout the
financial services industry beginning on 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. 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.
 
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 Dean Witter Reynolds Inc., Morgan
Stanley & Co. Incorporated and other broker-dealers that are affiliates of the
Investment Manager, and the Investment Manager's own analysis of factors it
deems relevant. The Fund's portfolio is managed within MSDW Advisors' Growth and
Income Group, which manages 26 equity funds and fund portfolios with
approximately $35.9 billion in assets as of May 31, 1998. Paul D. Vance, Senior
Vice President of MSDW Advisors and a member of the Growth and Income Group, has
been the primary portfolio manager of the Fund since its inception and has been
a portfolio manager at MSDW Advisors for over five years.
 
    Although the Fund does not engage in substantial short-term trading as a
means of achieving its investment objective, it may sell portfolio securities
without regard to the length of time they have been held, in accordance with the
investment policies described earlier. 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. In addition, the Fund
may incur brokerage commissions on transactions conducted through Dean Witter
Reynolds Inc., Morgan Stanley & Co. Incorporated and other brokers and dealers
that are affiliates of the Investment Manager.
 
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. 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).
 
        2. Purchase more than 10% of all outstanding voting securities or any
    class of securities of any one issuer.
 
        3. Invest more than 25% of the value of its total assets in securities
    of issuers in any one industry. This restriction does not apply to bank
    obligations or obligations issued or guaranteed by the United States
    Government or its agencies or instrumentalities.
 
        4. Invest more than 5% of the value of its total assets in securities of
    issuers having a record, together with predecessors, of less than three
    years of continuous operation. This restriction shall not apply to any
    obligation issued or guaranteed by the United States Government, its
    agencies or instrumentalities.
 
    Notwithstanding any other investment policy or restriction, the Fund may
seek to achieve its investment objective by investing all or substantially all
of its assets in another investment company having substantially the same
investment objective and policies as the Fund.
 
                                                                              11
<PAGE>
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
GENERAL
 
The Fund offers each class of its shares for sale to the public on a continuous
basis. Pursuant to a Distribution Agreement between the Fund and Morgan Stanley
Dean Witter Distributors Inc. ("MSDW Distributors" or 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 others who have entered
into selected dealer 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 B shares purchased by certain qualified plans are subject
to a CDSC scaled down from 2.0% to 1.0% if redeemed within three 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 qualified plans), and to certain other limited
categories of investors. At the discretion of the Board of Directors of the
Fund, Class A shares may be sold to categories of investors in addition to those
set forth in this prospectus at net asset value without a front-end sales
charge, and Class D shares may be sold to certain other categories of investors,
in each case as may be described in the then current prospectus of the Fund. See
"Alternative Purchase Arrangements-- Selecting a Particular Class" for a
discussion of factors to consider in selecting which Class of shares to
purchase.
 
    The minimum initial purchase is $1,000 for each Class of shares, although
Class D shares are only available to persons investing $5 million ($25 million
for certain qualified 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 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 Dividend Growth Securities Inc., 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 $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 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 MSDW Advisors 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, administrative and/or brokerage 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
requested 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 dividends and
distributions. Sales personnel of a Selected Broker-Dealer are compensated for
selling shares of the Trust 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
 
12
<PAGE>
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.
 
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 investment portfolio of the Fund except that Class A,
Class B and Class C shares bear the expenses of the ongoing shareholder service
fees, Class B and Class C shares bear the expenses of the ongoing distribution
fees and Class A, Class B and Class C shares which are redeemed subject to a
CDSC bear the expense of the additional incremental distribution costs resulting
from the CDSC applicable to shares of those Classes. The ongoing distribution
fees that are imposed on Class A, Class B and Class C shares will be imposed
directly against those Classes 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. (Class B shares purchased by certain
qualified plans are subject to a CDSC scaled down from 2.0% to 1.0% if redeemed
within three years after 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 lesser of: (a) the average daily aggregate gross sales of the Fund's Class B
shares since the inception of the 12b-1 Plan on July 2, 1984 (not including
reinvestments of dividends or capital gains distributions), less the average
daily aggregate net asset value of the Fund's Class B shares redeemed since the
inception of the 12b-1 Plan upon which a CDSC has been imposed or waived, or (b)
the average daily net assets of Class B attributable to shares issued, net of
related shares redeemed, since inception of the 12b-1 Plan. 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
 
                                                                              13
<PAGE>
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 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.
 
    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.
 
14
<PAGE>
    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.
 
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 qualified 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 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 401(k) and other plans qualified under Section 401(a)
of the Internal Revenue Code ("Qualified Retirement Plans") with at least 200
eligible employees and for which MSDW Trust serves as Trustee or DWR's
Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement;
 
    (4) Qualified Retirement Plans for which MSDW Trust serves as Trustee or
DWR's Retirement Plan Services as recordkeeper pursuant to a written
Recordkeeping Services Agreement 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
 
                                                                              15
<PAGE>
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
paragraphs (1), (2) or (5), 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 (or,
in the case of shares held by certain Qualified Retirement Plans, three years)
preceding the redemption. In addition, Class B shares are subject to an annual
12b-1 fee of 1.0% of the lesser of: (a) the average daily aggregate gross sales
of the Fund's Class B shares since the inception of the Fund's 12b-1 Plan on
July 2, 1984 (not including reinvestments of dividends or capital gains
distributions), less the average daily aggregate net asset value of the Fund's
Class B shares redeemed since the Plan's inception upon which a CDSC has been
imposed or waived, or (b) the average daily net assets of Class B attributable
to Class B shares issued, net of related shares redeemed, since inception of the
Plan.
 
    Except as noted below, Class B shares of the Fund which are held for six
years or more after purchase (calculated from the last day of the month in which
the shares were purchased) will not be subject to any CDSC upon redemption.
Shares redeemed earlier than six years after purchase may, however, be subject
to a CDSC which will be a percentage of the dollar amount of shares redeemed and
will be assessed on an amount equal to the lesser of the current market value or
the cost of the shares being redeemed. The size of this percentage will depend
upon how long 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>
 
    In the case of Class B shares of the Fund purchased on or after July 28,
1997 by Qualified Retirement Plans for which MSDW Trust serves as Trustee or
DWR's Retirement Plan Services serves as recordkeeper pursuant to a written
Recordkeeping Services Agreement, shares held for three years or more after
purchase (calculated as described in the paragraph above) will not be subject to
any CDSC upon redemption. However, shares redeemed earlier than three years
after purchase may be subject to a CDSC (calculated as described in the
paragraph above), the percentage of which will depend on 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...................................             2.0%
Second..................................             2.0%
Third...................................             1.0%
Fourth 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 (or, in the case of
shares held by certain Qualified Retirement Plans, three years) preceding the
redemption; (ii) the current net asset value of shares purchased more than six
years (or, in the case of shares held by certain Qualified Retirement Plans,
three 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 FSC Funds 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 which are attributable to reinvestment
of dividends or distributions from, or the proceeds of, certain Unit Investment
Trusts.
 
    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
 
16
<PAGE>
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) all redemptions of shares held for the benefit of a participant in a
Qualified Retirement Plan which offers investment companies managed by the
Investment Manager or its subsidiary, MSDW Services, as self-directed investment
alternatives and for which MSDW Trust serves as Trustee or DWR's Retirement Plan
Services serves as recordkeeper pursuant to a written Recordkeeping Services
Agreement ("Eligible Plan"), provided that either:  (a) the plan continues to be
an Eligible Plan after the redemption; or  (b) the redemption is in connection
with the complete termination of the plan involving the distribution of all plan
assets to participants.
 
    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.  All shares of the Fund held prior to July 28,
1997 (other than shares which were purchased prior to July 2, 1984 (and, with
respect to such shares, including such proportion of shares acquired through
reinvestment of dividends and capital gains distributions as the total number of
shares acquired prior to such date bears to the total number of Fund shares
purchased and owned by a shareholder (collectively, the "Old Shares")) and
shares held by certain employee benefit plans established by DWR and its
affiliate, SPS Transaction Services, Inc.) have been designated Class B shares.
Shares held before May 1, 1997 that have been designated Class B shares will
convert to Class A shares in May, 2007. In all other instances Class B shares
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 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 Qualified Retirement Plan for which MSDW Trust
serves as Trustee or DWR's Retirement Plan Services serves as recordkeeper
pursuant to a written Recordkeeping Services Agreement, the plan is treated as a
single investor and all Class B shares will convert to Class A shares on the
conversion date of the first shares of a Morgan Stanley Dean Witter Multi-Class
Fund purchased by that plan. In the case of Class B shares previously exchanged
for shares of an "Exchange Fund" (see "Shareholder Services-- Exchange
Privilege"), the period of time the shares were held in the Exchange Fund
(calculated from the last day of the month in which the Exchange Fund shares
were acquired) is excluded from the holding period for conversion. If those
shares are subsequently re-exchanged for Class B shares of a Morgan Stanley Dean
Witter Multi-Class Fund, the holding period resumes on the last day of the month
in which Class B shares are reacquired.
 
    If a shareholder has received share certificates for Class B shares, such
certificates must be delivered to the Transfer Agent at least one week prior to
the date for conversion. Class B shares evidenced by share certificates that are
not received by the Transfer Agent at least one week prior to any conversion
date will be converted into Class A shares on the next scheduled conversion date
after such certificates are received.
 
    Effectiveness of the conversion feature is subject to the continuing
availability of a ruling of the Internal Revenue Service or an opinion of
counsel that (i) the conversion of shares does not constitute a taxable event
under the Internal Revenue Code, (ii) Class A shares received on conversion will
have a basis equal to the shareholder's basis in the converted Class B shares
immediately prior to the conversion, and (iii) Class A shares received on
conversion will have a holding period that includes the holding period of the
converted Class B shares. The conversion feature may be suspended if the ruling
or opinion is no longer available. In such event, Class B shares would continue
to be subject to Class B 12b-1 fees.
 
                                                                              17
<PAGE>
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 Directors 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 Qualified
Retirement Plans for which MSDW Trust serves as Trustee or DWR's Retirement Plan
Services serves as recordkeeper pursuant to a written Recordkeeping Services
Agreement) and the following categories of investors: (i) investors
participating in the MSDW Advisors 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) 401(k) plans established by DWR and SPS
Transaction Services, Inc. (an affiliate of DWR) for their employees; (iv)
certain Unit Investment Trusts sponsored by DWR; (v) certain other open-end
investment companies whose shares are distributed by the Distributor; and (vi)
other categories of investors, at the discretion of the Board, as disclosed in
the then current prospectus of the Fund. The Old Shares and shares held by the
employee benefit plans referred to in clause (iii) above prior to July 28, 1997
have been designated Class D shares. 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 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 will pay the Distributor a fee, which is accrued daily and paid
monthly, at the annual rate of 1.0% of the lesser of: (a) the average daily
aggregate gross sales of the Fund's Class B shares since the inception of the
Plan on July 2, 1984 (not including reinvestments of dividends or capital gains
distributions), less the average daily aggregate net asset value of the Fund's
Class B shares redeemed since the Plan's inception upon which a CDSC has been
imposed or waived, or (b) the average daily net assets of Class B attributable
to Class B shares issued, net of related shares redeemed, since inception of the
Plan. The fee is treated by the Fund as an expense in the year it is accrued. In
the case of Class A shares, the entire amount of the fee currently represents a
service fee within the meaning of the NASD guidelines. In the case of Class B
and Class C shares, a portion of the fee payable pursuant to the Plan, equal to
0.25% of the average daily net assets of each of these Classes, is currently
characterized as a service fee. A service fee is a payment made for personal
service and/or the maintenance of shareholder accounts.
 
    Additional amounts paid under the Plan in the case of Class B and Class C
shares are paid to the Distributor for services provided and the expenses borne
by the Distributor and others in the distribution of the shares of those
Classes, including the payment of commissions for sales of the shares of those
Classes and incentive compensation to and expenses of Morgan Stanley Dean Witter
Financial Advisors and others who engage in or support distribution of shares or
who service shareholder accounts, including overhead and telephone expenses;
printing and distribution
 
18
<PAGE>
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.
 
    For the fiscal year ended February 28, 1998, Class B shares of the Fund
accrued payments under the Plan amounting to $102,153,119, which amount is equal
to 0.69% of the Fund's average daily net assets for the fiscal year. These
payments were calculated pursuant to clause (a) of the compensation formula
under the Plan. All shares held prior to July 28, 1997 (other than the Old
Shares) have been designated Class B shares. For the period July 28, 1997
through February 28, 1998, Class A and Class C shares of the Fund accrued
payments under the Plan amounting to $61,937 and $146,126, respectively, which
amounts on an annualized basis are equal to 0.24% and 1.00% of the average daily
net assets of Class A and Class C, respectively, for such period.
 
    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. 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. The Distributor has advised the Fund that such
excess amounts, including the carrying charge described above, totalled
$250,796,590 at February 28, 1998, which was equal to 1.48% of the net assets of
Class B on such date. Because there is no requirement under the Plan that 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 Directors 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, 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
or other Selected Broker-Dealer representatives at the time of sale may be
reimbursed in the subsequent calendar year. The Distributor has advised the Fund
that unreimbursed 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 totalled $249,288 in the case of Class C at
December 31 1997, which amount was equal to 0.75% of the net assets of Class C
on such date, and that there were no such expenses that may be reimbursed in the
subsequent year in the case of Class A on such date. 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 is determined once daily at 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 by
taking net assets of the Fund, dividing by the number of shares outstanding and
adjusting to the nearest cent. The assets 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, 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; 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 Directors); and (2) all other portfolio securities for which
over-the-counter market quotations are readily available are valued at the
latest bid price. When market quotations are not readily available, including
circumstances under which it is determined by the Investment Manager that sale
and 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
Directors (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).
 
    Short-term debt securities with remaining maturities of sixty days or less
at the time of purchase are valued at
 
                                                                              19
<PAGE>
amortized cost, unless the Directors 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 Directors.
 
    Certain securities in the Fund's portfolio may be valued by an outside
pricing service approved by the Fund's Directors. The pricing service may
utilize a matrix system incorporating security quality, maturity and coupon as
the evaluation model parameters, and/or research evaluations by its staff,
including review of broker-dealer market price quotations, in determining what
it believes is the fair valuation of the portfolio securities valued by such
pricing service.
 
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").
 
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").
 
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 and are not subject to the imposition of a front-end sales charge or a
CDSC (see "Redemptions and Repurchases.")
 
SYSTEMATIC WITHDRAWAL PLAN.  A systematic withdrawal plan (the "Withdrawal
Plan") is available for shareholders who own or purchase shares of the Fund
having a minimum value of $10,000 based upon the then current net asset value.
The Withdrawal Plan provides for monthly or quarterly (March, June, September
and December) checks in any amount, not less than $25, or in any whole
percentage of the account balance, on an annualized basis. Any applicable CDSC
will be imposed on shares redeemed under the Withdrawal Plan (see "Purchase of
Fund Shares"). Therefore, 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 or quarterly amount. 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.
 
    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 through DWR for
use by corporations, the self-employed, eligible 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 adviser.
 
    For further information regarding plan administration, custodial fees and
other details, investors should contact their Morgan Stanley Dean Witter
Financial Advisor or other Selected Broker-Dealer representative or the Transfer
Agent.
 
EXCHANGE PRIVILEGE
 
Shares of each Class may be exchanged for shares of the same Class of any other
Morgan Stanley Dean Witter Multi-Class Fund without the imposition of any
exchange fee. Shares may also be exchanged for shares of the following funds:
Morgan Stanley Dean Witter Short-Term U.S. Treasury Trust, Morgan Stanley Dean
Witter Limited Term Municipal Trust, Morgan Stanley Dean Witter Short-Term Bond
Fund, Morgan Stanley Dean Witter Intermediate Term U.S. Treasury Trust 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"). Class B shares may also be exchanged for
shares of Morgan Stanley Dean Witter Global Short-Term Income Fund Inc. ("Global
Short-Term"), which is a Morgan Stanley Dean Witter Fund offered with a CDSC.
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.
 
20
<PAGE>
    An exchange to another Morgan Stanley Dean Witter Multi-Class Fund, any FSC
Fund, Global Short-Term 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 their net asset value determined the
following business day. Subsequent exchanges between any of the money market
funds and any of the Morgan Stanley Dean Witter Multi-Class Funds, FSC Funds,
Global Short-Term 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 or shares of Global Short-Term, 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 or shares of
Global Short-Term 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 or in shares of Global Short-Term
(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 shares of Global Short-Term or 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 to the shareholder
not later than ten days following such shareholder's most recent exchange.
 
    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
may be 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 one 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 a
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 broker-dealer of
record and its account numbers are part of the account information, shareholders
may initiate an exchange of shares of the Fund for shares of any of the Morgan
Stanley Dean Witter Funds (for which the Exchange Privilege is available)
pursuant to this Exchange Privilege by contacting their Morgan Stanley Dean
Witter Financial Advisor or other Selected Broker-Dealer representative (no
Exchange Privilege Authorization Form is required). Other shareholders (and
those shareholders who are clients of DWR or another 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
 
                                                                              21
<PAGE>
may be made 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
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 will 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 case with the Morgan Stanley Dean Witter Funds in the past.
 
    For further information concerning 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.  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"). If shares are held in a Shareholder Investment 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, 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 determined (see "Purchase of Fund Shares") 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 the Fund or the
Distributor. The offer by DWR and other Selected Broker-Dealers to repurchase
shares may be suspended without notice by them 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, upon 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 have a value of less than
$100, or such lesser amount as may be fixed by the Fund's Board of Directors 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 the shareholder sixty days to make an additional investment in
an amount which will increase the value of the account to at least the
applicable amount before the redemption is processed. No CDSC will be imposed on
any involuntary redemption.
 
22
<PAGE>
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
DIVIDENDS AND DISTRIBUTIONS.  The Fund declares dividends separately for each
Class of shares and intends to pay quarterly income dividends and to distribute
net short-term and long-term capital gains, if any, at least once per 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 will be automatically credited to the shareholder's
account without issuance of a share certificate unless the shareholder requests
in writing that all dividends 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 remain qualified 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
such income and capital gains. 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 net short-term capital gains, are
taxable to the shareholder as ordinary dividend 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 calendar year prior to February 1 will be deemed, for tax
purposes, to have been received by the shareholder in the prior year. Dividend
distributions 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. In this regard,
a 46-day holding period generally must be met.
 
    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 Fund may at times make payments from sources other than income or net
capital gains. Payments from such sources will, in effect, represent a return of
a portion of each shareholder's investment. All, or a portion, of such payments
will not be taxable to shareholders.
 
    After the end of the year, shareholders will be sent full information on
their dividends and capital gains distributions for tax purposes. Shareholders
will also be notified of the proportionate share of long-term capital gains
distributions 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. 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 would 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,
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 a
hypothetical investment of $10,000, $50,000 or $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.
 
                                                                              23
<PAGE>
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
VOTING RIGHTS.  All shares of common stock of the Fund are of $0.01 par value
and are equal as to earnings, assets and voting privileges except that each
Class 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.
 
    Under ordinary circumstances, the Fund is not required, nor does it intend,
to hold Annual Meetings of Shareholders. The Directors may call Special Meetings
of Shareholders for action by shareholder vote as may be required by the Act or
the Fund's By-Laws.
 
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 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.
 
24
<PAGE>
MORGAN STANLEY DEAN WITTER
DIVIDEND GROWTH SECURITIES INC.
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
 
BOARD OF DIRECTORS
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
 
Paul D. Vance
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
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036
 
INVESTMENT MANAGER
Morgan Stanley Dean Witter Advisors Inc.


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