MORGAN STANLEY DEAN WITTER UTILITIES FUND
497, 1999-05-07
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<PAGE>
                                                       PROSPECTUS -  MAY 1, 1999
 
Morgan Stanley Dean Witter
                                                                  UTILITIES FUND
 
[COVER PHOTO]
 
                              A MUTUAL FUND THAT SEEKS TO PROVIDE CURRENT INCOME
                                      AND LONG-TERM GROWTH OF INCOME AND CAPITAL
 
  The Securities and Exchange Commission has not approved or disapproved these
 securities or passed upon the adequacy of this PROSPECTUS. Any representation
                     to the contrary is a criminal offense.
<PAGE>
CONTENTS
 
<TABLE>
<S>                       <C>                                                           <C>
The Fund                  Investment Objective........................................                   1
                          Principal Investment Strategies.............................                   1
                          Principal Risks.............................................                   2
                          Past Performance............................................                   3
                          Fees and Expenses...........................................                   4
                          Additional Investment Strategy Information..................                   5
                          Additional Risk Information.................................                   5
                          Fund Management.............................................                   6
 
Shareholder Information   Pricing Fund Shares.........................................                   7
                          How to Buy Shares...........................................                   7
                          How to Exchange Shares......................................                   9
                          How to Sell Shares..........................................                  10
                          Distributions...............................................                  12
                          Tax Consequences............................................                  12
                          Share Class Arrangements....................................                  13
 
Financial Highlights      ............................................................                  21
 
Our Family of Funds       ............................................................   Inside Back Cover
 
                          THIS PROSPECTUS CONTAINS IMPORTANT INFORMATION ABOUT THE FUND.
                          PLEASE READ IT CAREFULLY AND KEEP IT FOR FUTURE REFERENCE.
</TABLE>
 
           FUND CATEGORY
           ---------------------------
       / /  Growth
       /X/  GROWTH AND INCOME
       / /  Income
       / /  Money Market
<PAGE>
(Sidebar)
GROWTH AND INCOME
An investment objective having the goal of selecting securities with the
potential to rise in value and pay out income.
(End Sidebar)
 
THE FUND
 
ICON                INVESTMENT OBJECTIVE
- --------------------------------------------------------------------------------
                    Morgan Stanley Dean Witter Utilities Fund is a mutual fund
                    that seeks to provide current income and long-term growth of
                    income and capital. There is no guarantee that the Fund will
                    achieve these objectives.
 
                    On April 22, 1999, the Fund's Board of Trustees unanimously
                    recommended that the Fund's shareholders approve changing
                    the Fund's investment objective to: "seek both capital
                    appreciation and current income." This change would have the
                    effect of eliminating long-term growth of income as an
                    objective of the Fund.
 
ICON                PRINCIPAL INVESTMENT STRATEGIES
- --------------------------------------------------------------------------------
   
                    The Fund will normally invest at least 65% of its assets in
                    the common stock, other equity and investment grade
                    fixed-income securities (including zero coupon securities)
                    of companies that are engaged in the utilities industry. A
                    company will be considered to be in the utilities industry
                    if it derives at least 50% of its revenues or earnings from
                    the utilities industry or devotes at least 50% of its assets
                    to activities in the industry. These may include companies
                    involved in, among other areas: telecommunications, gas and
                    electric energy, water distribution, the Internet and
                    Internet related services. The companies may be
                    traditionally regulated public utilities or fully or
                    partially deregulated utility companies as well as
                    unregulated utility companies. The Fund's "Investment
                    Manager," Morgan Stanley Dean Witter Advisors Inc., will
                    shift the Fund's asset between different types of utilities
                    and between equity and fixed-income securities, based on
                    prevailing market, economic and financial conditions. The
                    Fund does not have any set policies to concentrate its
                    assets in any particular segment of the utilities industry
                    or any particular type of security. However, the Fund's
                    policy to concentrate its assets in the public utility
                    industry is fundamental, and may not be changed without
                    shareholder approval. In selecting common stock and other
                    equity securities, the Investment Manager considers earnings
                    and dividend growth, book value, dividend discount and
                    price/ earnings relationships. In addition, the Investment
                    Manager makes continuing assessments of management, the
                    prevailing regulator's framework and industry trends.
                    Computer-based equity selection models also may be used. If
                    the Investment Manager believes favorable conditions for
                    capital growth of equity securities are not prevalent at a
                    particular time, it may allocate the Fund's assets
                    predominantly or exclusively to debt securities with the aim
                    of obtaining current income and thus benefitting long-term
                    growth of capital.
    
 
                    Common stock is a share ownership or equity interest in a
                    corporation. It may or may not pay dividends, as some
                    companies reinvest all of their profits back into their
                    businesses, while others pay out some of their profits to
                    shareholders as dividends. Fixed-income securities, however,
                    are debt securities such as bonds, notes and commercial
                    paper. The issuer of a debt security borrows money from the
                    investor who buys the security. Most debt securities either
                    pay fixed or adjustable rates of interest at regular
                    intervals until they mature, at which point investors get
                    their principal back.
 
                    In pursuing the Fund's investment objectives, the Investment
                    Manager has considerable leeway in deciding which
                    investments it buys, holds or sells on a day-to-day basis --
                    and which trading strategies it uses. For example, the
                    Investment Manager in its discretion may determine to use
                    some permitted trading strategies while not using others. In
                    addition to the securities discussed above, the Fund may
                    make investments in foreign securities and other
                    investments. For more information about the Fund's
                    investments, see the "Additional Investment Strategy
                    Information" section.
 
                                                                               1
<PAGE>
ICON                PRINCIPAL RISKS
- --------------------------------------------------------------------------------
                    The Fund's share price will fluctuate with changes in the
                    market value of the Fund's portfolio securities. When you
                    sell Fund shares, they may be worth less than what you paid
                    for them and, accordingly, you can lose money investing in
                    this Fund.
 
                    UTILITIES INDUSTRY. The Fund's investments in the utilities
                    industry are impacted by risks particular to that industry.
                    Changing regulation constitutes one of the key
                    industry-specific risks for the Fund, especially with
                    respect to its investments in traditionally regulated public
                    utilities and partially regulated utility companies. State
                    and other regulators monitor and control utility revenues
                    and costs, and therefore may limit utility profits and
                    dividends paid to investors. Regulatory authorities also may
                    restrict a company's access to new markets, thereby
                    diminishing the company's long-term prospects. Individual
                    sectors of the utility market are subject to additional
                    risks. These risks apply to all utility companies --
                    regulated or fully or partially deregulated. For example,
                    telecommunications companies have been affected by
                    technological developments leading to increased competition,
                    as well as changing regulation of local and long-distance
                    telephone service and other telecommunications businesses.
                    Certain telecommunications companies have not benefitted
                    from the new competitive climate.
 
                    Electric utilities may incur unexpected increases in fuel
                    and other operating costs. They are adversely affected when
                    long-term interest rates rise. Long-term borrowings are used
                    to finance most utility investment, and rising interest
                    rates lead to higher financing costs and reduced earnings.
                    There are also the considerable costs associated with
                    environmental compliance, nuclear waste clean-up, and safety
                    regulation. Increasingly, regulators are calling upon
                    electric utilities to bear these added costs, and there is a
                    risk that these costs will not be fully recovered through an
                    increase in revenues.
 
                    Among gas companies, there has been a move to diversify into
                    oil and gas exploration and development, making investment
                    returns more sensitive to energy prices. In the case of the
                    water utility sector, the industry is highly fragmented, and
                    most water supply companies find themselves in mature
                    markets, with little potential for growth.
 
                    COMMON STOCKS AND OTHER EQUITY SECURITIES. In general, stock
                    and other equity security values fluctuate in response to
                    activities specific to the company as well as general
                    market, economic and political conditions. The prices can
                    fluctuate widely in response to these factors. This can
                    especially be the case for fully or partially deregulated
                    utility companies.
 
                    FIXED-INCOME SECURITIES. All fixed-income securities are
                    subject to two types of risk: credit risk and interest rate
                    risk. Credit risk refers to the possibility that the issuer
                    of a security will be unable to make interest payments
                    and/or repay the principal on its debt. Interest rate risk
                    refers to fluctuations in the value of a fixed-income
                    security resulting from changes in the general level of
                    interest rates. When the general level of interest rates
                    goes up, the prices of most fixed-income securities go down.
                    When the general level of interest rates goes down, the
                    prices of most fixed-income securities go up. (Zero coupon
                    securities are typically subject to greater price
                    fluctuations than comparable securities that pay interest.)
 
2
<PAGE>
(Sidebar)
ANNUAL TOTAL RETURNS
This chart shows how the performance of the Fund's Class B shares has varied
from year to year over the past 10 calendar years.
 
AVERAGE ANNUAL
TOTAL RETURNS
This table compares the Fund's average annual returns with those of a broad
measure of market performance over time. The Fund's returns include the maximum
applicable sales charge for each Class and assume you sold your shares at the
end of each period.
(End Sidebar)
                    FOREIGN SECURITIES. The Fund's investments in foreign
                    securities (including depository receipts) involve risks in
                    addition to the risks associated with domestic securities.
                    See the "Additional Risk Information" section for a
                    description of these risks.
                    OTHER RISKS. The performance of the Fund also will depend on
                    whether the Investment Manager is successful in pursuing the
                    Fund's investment strategy. The Fund is also subject to
                    other risks from its permissible investments. For more
                    information about these risks, see the "Additional Risk
                    Information" section.
                    Shares of the Fund are not bank deposits and are not
                    guaranteed or insured by any bank, governmental entity, or
                    the FDIC.
 
ICON                PAST PERFORMANCE
- --------------------------------------------------------------------------------
                    The bar chart and table below provide some indication of the
                    risks of investing in the Fund. The Fund's past performance
                    does not indicate how the Fund will perform in the future.
                    ANNUAL TOTAL RETURNS -- CALENDAR YEARS
 
                    EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC
 
<TABLE>
<S>        <C>
1989          24.51%
90            -0.27%
91            18.89%
92             8.75%
93            12.79%
94            -9.90%
95            28.42%
96             4.99%
97            25.79%
98            21.95%
</TABLE>
 
                    The bar chart reflects the performance of Class B shares;
                    the performance of the other Classes will differ because the
                    Classes have different ongoing fees. The performance
                    information in the bar chart does not reflect the deduction
                    of sales charges; if these amounts were reflected, returns
                    would be less than shown.
                    During the periods shown in the bar chart, the highest
                    return for a calendar quarter was 13.23% (quarter ended
                    December 31, 1997) and the lowest return for a calendar
                    quarter was -7.10% (quarter ended March 31, 1994).
                    Year-to-date total return as of March 31, 1999 was -3.91%.
 
<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURNS (FOR THE PERIOD ENDED THE 1998
CALENDAR YEAR)
- ---------------------------------------------------------------
                                     PAST 1 YEAR   PAST 5 YEARS   PAST 10 YEARS
<S>                                  <C>           <C>            <C>
- -------------------------------------------------------------------------------
 Class A                               16.41%           --             --
- -------------------------------------------------------------------------------
 Class B(1)                            16.95%         13.02%         12.93%
- -------------------------------------------------------------------------------
 Class C                               20.92%           --             --
- -------------------------------------------------------------------------------
 Class D                               23.21%           --             --
- -------------------------------------------------------------------------------
 S&P 500 Index(2)                      28.58%         24.05%         19.19%
- -------------------------------------------------------------------------------
 Lipper Utility Fund Average(3)        18.17%         13.73%         13.84%
- -------------------------------------------------------------------------------
</TABLE>
 
1    Prior to July 28, 1997, the Fund only issued Class B shares.
2    The Standard & Poor's-Registered Trademark- 500 Composite Stock Price Index
     is a broad-based index, the performance of which is based on the average
     performance of 500 widely held common stocks. The performance of the Index
     does not include any expenses, fees or charges. The returns for the Index
     have been adjusted to reflect the reinvestment of dividends. The Index is
     unmanaged and should not be considered an investment.
3    The Lipper Utility Funds Average tracks the performance of funds which
     invest 65% of their equity portfolio in utility shares, as reported by
     Lipper Analytical Services. The returns for the Index have been adjusted to
     reflect the reinvestment of dividends.
 
                                                                               3
<PAGE>
(Sidebar)
SHAREHOLDER FEES
These fees are paid directly from your investment.
 
ANNUAL FUND
OPERATING EXPENSES
 
These expenses are deducted from the Fund's assets and are based on expenses
paid for the fiscal year ended December 31, 1998.
(End Sidebar)
 
ICON                FEES AND EXPENSES
- --------------------------------------------------------------------------------
                    The Fund offers four Classes of shares: Classes A, B, C and
                    D. Each Class has a different combination of fees, expenses
                    and other features. The table below briefly describes these
                    fees and expenses. The Fund does not charge account or
                    exchange fees. See the "Share Class Arrangements" section
                    for further fee and expense information.
 
<TABLE>
<CAPTION>
                                                              CLASS A   CLASS B   CLASS C    CLASS D
<S>                                                           <C>       <C>       <C>        <C>
- ----------------------------------------------------------------------------------------------------
 SHAREHOLDER FEES
- ----------------------------------------------------------------------------------------------------
 Maximum sales charge (load) imposed on purchases (as a
 percentage of offering price)                                  5.25%(1)  None      None      None
- ----------------------------------------------------------------------------------------------------
 Maximum deferred sales charge (load) (as a percentage based
 on the lesser of the offering price or net asset value at
 redemption)                                                  None(2)     5.00%(3)    1.00%(4)  None
- ----------------------------------------------------------------------------------------------------
 ANNUAL FUND OPERATING EXPENSES
- ----------------------------------------------------------------------------------------------------
 Management fee                                                 0.54%     0.54%      0.54%     0.54%
- ----------------------------------------------------------------------------------------------------
 Distribution and service (12b-1) fees                          0.25%     1.00%      1.00%    None
- ----------------------------------------------------------------------------------------------------
 Other expenses                                                 0.11%     0.11%      0.11%     0.11%
- ----------------------------------------------------------------------------------------------------
 Total annual Fund operating expenses                           0.90%     1.65%      1.65%     0.65%
- ----------------------------------------------------------------------------------------------------
</TABLE>
 
1    Reduced for purchases of $25,000 and over.
2    Investments that are not subject to any sales charge at the time of
     purchase are subject to a contingent deferred sales charge ("CDSC") of
     1.00% that will be imposed on sales made within one year after purchase,
     except for certain specific circumstances.
3    The CDSC is scaled down to 1.00% during the sixth year, reaching zero
     thereafter. See "Share Class Arrangements" for a complete discussion of the
     CDSC.
4    Only applicable to sales made within one year after purchase.
 
                    EXAMPLE
                    This example is intended to help you compare the cost of
                    investing in the Fund with the cost of investing in other
                    mutual funds.
 
                    The example assumes that you invest $10,000 in the Fund,
                    your investment has a 5% return each year, and the Fund's
                    operating expenses remain the same. Although your actual
                    costs may be higher or lower, the tables below show your
                    costs at the end of each period based on these assumptions
                    depending upon whether or not you sell your shares at the
                    end of each period.
 
<TABLE>
<CAPTION>
                         IF YOU SOLD YOUR SHARES:                    IF YOU HELD YOUR SHARES:
                 -----------------------------------------   -----------------------------------------
                 1 YEAR    3 YEARS    5 YEARS    10 YEARS    1 YEAR    3 YEARS    5 YEARS    10 YEARS
<S>              <C>       <C>        <C>        <C>         <C>       <C>        <C>        <C>
- ----------------------------------------------------------   -----------------------------------------
 CLASS A           $612      $797       $ 997      $1575       $612      $797       $997       $1575
- ----------------------------------------------------------   -----------------------------------------
 CLASS B           $668      $820       $1097      $1955       $168      $520       $897       $1955
- ----------------------------------------------------------   -----------------------------------------
 CLASS C           $268      $520       $ 897      $1955       $168      $520       $897       $1955
- ----------------------------------------------------------   -----------------------------------------
 CLASS D           $ 66      $208       $ 362      $ 810       $ 66      $208       $362       $ 810
- ----------------------------------------------------------   -----------------------------------------
</TABLE>
 
4
<PAGE>
ICON                ADDITIONAL INVESTMENT STRATEGY INFORMATION
- --------------------------------------------------------------------------------
                    The Fund seeks to provide current income and long-term
                    growth of income and capital. There is no guarantee that the
                    Fund will achieve these objectives.
 
                    This section provides additional information concerning the
                    Fund's principal strategies.
 
                    FOREIGN SECURITIES. The Fund may invest up to 25% of its
                    assets in foreign securities, including common stock, other
                    equity and investment grade fixed-income securities.
                    However, this percentage limitation does not apply to
                    securities of foreign companies that are listed in the U.S.
                    on a national securities exchange.
 
                    DEFENSIVE INVESTING. The Fund may take temporary "defensive"
                    positions in attempting to respond to adverse market
                    conditions. The Fund may invest any amount of its assets in
                    cash or money market instruments in a defensive posture when
                    the Investment Manager believes it is advisable to do so.
                    Although taking a defensive posture is designed to protect
                    the Fund from an anticipated market downturn, it could have
                    the effect of reducing the benefit from any upswing in the
                    market.
 
                    The percentage limitations relating to the composition of
                    the Fund's portfolio referenced in "Principal Investment
                    Strategies" apply at the time the Fund acquires an
                    investment. Subsequent percentage changes that result from
                    market fluctuations or changes in assets will not require
                    the Fund to sell any portfolio security. The Fund may change
                    its principal investment strategies without shareholder
                    approval; however, you would be notified of any changes.
 
ICON                ADDITIONAL RISK INFORMATION
- --------------------------------------------------------------------------------
                    As discussed in the "Principal Risks" section, a principal
                    risk of investing in the Fund is associated with its common
                    stock, other equity and fixed-income investments. This
                    section provides additional information regarding the
                    principal risks of investing in the Fund.
 
                    FOREIGN SECURITIES. The Fund's investments in foreign
                    securities (including depository receipts) involve risks
                    that are in addition to the risks associated with domestic
                    securities. One additional risk is currency risk. While the
                    price of Fund shares is quoted in U.S. dollars, the Fund
                    generally converts U.S. dollars to a foreign market's local
                    currency to purchase a security in that market. If the value
                    of that local currency falls relative to the U.S. dollar,
                    the U.S. dollar value of the foreign security will decrease.
                    This is true even if the foreign security's local price
                    remains unchanged.
 
                    Foreign securities also have risks related to economic and
                    political developments abroad, including expropriations,
                    confiscatory taxation, exchange control regulation,
                    limitations on the use or transfer of Fund assets and any
                    effects of foreign social, economic or political
                    instability. In particular, adverse political or economic
                    developments in the Pacific region and/or a particular
                    country in which the Fund invests could cause a substantial
                    decline in value of the portfolio. Foreign companies, in
                    general, are not subject to the regulatory requirements of
                    U.S.
 
                                                                               5
<PAGE>
(Sidebar)
MORGAN STANLEY DEAN WITTER ADVISORS INC.
 
The Investment Manager is widely recognized as a leader in the mutual fund
industry and together with Morgan Stanley Dean Witter Services Company Inc., its
wholly-owned subsidiary, has more than $129 billion in assets under management
or administration as of March 31, 1999.
(End Sidebar)
                    companies and, as such, there may be less publicly available
                    information about these companies. Moreover, foreign
                    accounting, auditing and financial reporting standards
                    generally are different from those applicable to U.S.
                    companies. Finally, in the event of a default of any foreign
                    debt obligations, it may be more difficult for the Fund to
                    obtain or enforce a judgment against the issuers of the
                    securities.
 
                    Securities of foreign issuers may be less liquid than
                    comparable securities of U.S. issuers and, as such, their
                    price changes may be more volatile. Furthermore, foreign
                    exchanges and broker-dealers are generally subject to less
                    government and exchange scrutiny and regulation than their
                    U.S. counterparts.
 
                    YEAR 2000. The Fund could be adversely affected if the
                    computer systems necessary for the efficient operation of
                    the Investment Manager, the Fund's other service providers
                    and the markets and individual and governmental issuers in
                    which the Fund invests do not properly process and calculate
                    date-related information from and after January 1, 2000.
                    While year 2000-related computer problems could have a
                    negative effect on the Fund, the Investment Manager and its
                    affiliates are working hard to avoid any problems and to
                    obtain assurances from their service providers that they are
                    taking similar steps.
 
                    In addition, it is possible that the markets for securities
                    in which the Fund invests may be detrimentally affected by
                    computer failures throughout the financial services industry
                    beginning January 1, 2000. Improperly functioning trading
                    systems may result in settlement problems and liquidity
                    issues. Corporate and governmental data processing errors
                    also may result in production problems for individual
                    companies and overall economic uncertainties. Earnings of
                    individual issuers will be affected by remediation costs,
                    which may be substantial and may be reported inconsistently
                    in U.S. and foreign financial statements. Accordingly, the
                    Fund's investments may be adversely affected.
 
ICON                FUND MANAGEMENT
- --------------------------------------------------------------------------------
                    The Fund has retained the Investment Manager -- Morgan
                    Stanley Dean Witter Advisors Inc. -- to provide
                    administrative services, manage its business affairs and
                    invest its assets, including the placing of orders for the
                    purchase and sale of portfolio securities. The Investment
                    Manager is a wholly-owned subsidiary of Morgan Stanley Dean
                    Witter & Co., a preeminent global financial services firm
                    that maintains leading market positions in each of its three
                    primary businesses: securities, asset management and credit
                    services. Its main business office is located at Two World
                    Trade Center, New York, New York 10048.
 
                    The Fund's portfolio is managed within the Investment
                    Manager's Income and Growth Group. Edward F. Gaylor, a
                    Senior Vice President of the Investment Manager, has been
                    the primary portfolio manager of the Fund since it commenced
                    operations and a portfolio manager with the Investment
                    Manager for over five years.
 
                    The Fund pays the Investment Manager a monthly management
                    fee as full compensation for the services and facilities
                    furnished to the Fund, and for Fund expenses assumed by the
                    Investment Manager. The fee is based on the Fund's average
                    daily net assets. For fiscal year ended December 31, 1998,
                    the Fund accrued total compensation to the Investment
                    Manager amounting to 0.54% of the Fund's average daily net
                    assets.
 
6
<PAGE>
(Sidebar)
CONTACTING A FINANCIAL ADVISOR
If you are new to the Morgan Stanley Dean Witter Family of Funds and would like
to contact a Financial Advisor, call (800) THE-DEAN for the telephone number of
the Morgan Stanley Dean Witter office nearest you. You may also access our
office locator on our Internet site at:
www.deanwitter.com/funds
(End Sidebar)
 
SHAREHOLDER INFORMATION
 
ICON                PRICING FUND SHARES
- --------------------------------------------------------------------------------
                    The price of Fund shares (excluding sales charges), called
                    "net asset value," is based on the value of the Fund's
                    portfolio securities. While the assets of each Class are
                    invested in a single portfolio of securities, the net asset
                    value of each Class will differ because the Classes have
                    different ongoing distribution fees.
 
                    The net asset value per share of the Fund is determined once
                    daily at 4:00 p.m. Eastern time on each day that the New
                    York Stock Exchange is open (or, on days when the New York
                    Stock Exchange closes prior to 4:00 p.m., at such earlier
                    time). Shares will not be priced on days that the New York
                    Stock Exchange is closed.
 
                    The value of the Fund's portfolio securities is based on the
                    securities' market price when available. When a market price
                    is not readily available, including circumstances under
                    which the Investment Manager determines that a security's
                    market price is not accurate, a portfolio security is valued
                    at its fair value, as determined under procedures
                    established by the Fund's Board of Trustees. In these cases,
                    the Fund's net asset value will reflect certain portfolio
                    securities' fair value rather than their market price. In
                    addition, if the Fund holds securities primarily listed on
                    foreign exchanges, the value of the Fund's portfolio
                    securities may change on days when you will not be able to
                    purchase or sell your shares.
 
                    An exception to the Fund's general policy of using market
                    prices concerns its short-term debt portfolio securities.
                    Debt securities with remaining maturities of sixty days or
                    less at the time of purchase are valued at amortized cost.
                    However, if the cost does not reflect the securities' market
                    value, these securities will be valued at their fair value.
 
ICON                HOW TO BUY SHARES
- --------------------------------------------------------------------------------
                    You may open a new account to buy Fund shares or buy
                    additional Fund shares for an existing account by contacting
                    your Morgan Stanley Dean Witter Financial Advisor or other
                    authorized financial representative. Your Financial Advisor
                    will assist you, step-by-step, with the procedures to invest
                    in the Fund. You may also purchase shares directly by
                    calling the Fund's transfer agent and requesting an
                    application.
 
                    Because every investor has different immediate financial
                    needs and long-term investment goals, the Fund offers
                    investors four Classes of shares: Classes A, B, C and D.
                    Class D shares are only offered to a limited group of
                    investors. Each Class of shares offers a distinct structure
                    of sales charges, distribution and service fees, and other
                    features that are designed to address a variety of needs.
                    Your Financial Advisor or other authorized financial
                    representative can help you decide which Class may be most
                    appropriate for you. When purchasing Fund shares, you must
                    specify which Class of shares you wish to purchase.
 
                                                                               7
<PAGE>
(Sidebar)
EASYINVEST-SM-
A purchase plan that allows you to transfer money automatically from your
checking or savings account or from a Money Market Fund on a semi-monthly,
monthly or quarterly basis. Contact your Morgan Stanley Dean Witter Financial
Advisor for further information about this service.
(End Sidebar)
 
                    When you buy Fund shares, the shares are purchased at the
                    next share price calculated (less any applicable front-end
                    sales charge for Class A shares) after we receive your
                    investment order in proper form. We reserve the right to
                    reject any order for the purchase of Fund shares.
 
<TABLE>
<CAPTION>
MINIMUM INVESTMENT AMOUNTS
- ------------------------------------------------------------------------------------------------
                                                                            MINIMUM INVESTMENT
                                                                          ----------------------
 INVESTMENT OPTIONS                                                       INITIAL    ADDITIONAL
<S>                                  <C>                                  <C>        <C>
- ------------------------------------------------------------------------------------------------
 Regular Accounts                                                          $ 1,000      $ 100
- ------------------------------------------------------------------------------------------------
 Individual Retirement Accounts:     Regular IRAs                          $ 1,000      $ 100
                                     Education IRAs                           $500      $ 100
- ------------------------------------------------------------------------------------------------
 EASYINVEST-SM-                      (Automatically from your checking
                                     or savings account or Money Market
                                     Fund)                                   $100*      $ 100*
- ------------------------------------------------------------------------------------------------
</TABLE>
 
*    Provided your schedule of investments totals $1,000 in twelve months.
 
   
                    There is no minimum investment amount if you purchase Fund
                    shares through: (1) the Investment Manager's mutual fund
                    asset allocation plan, (2) a program, approved by the Fund's
                    distributor, in which you pay an asset-based fee for
                    advisory, administrative and/or brokerage services; or (3)
                    employer-sponsored employee benefit plan accounts.
    
 
                    INVESTMENT OPTIONS FOR CERTAIN INSTITUTIONAL AND OTHER
                    INVESTORS/CLASS D SHARES. To be eligible to purchase Class D
                    shares, you must qualify under one of the investor
                    categories specified in the "Share Class Arrangements"
                    section of this PROSPECTUS.
 
                    THREE DAY SETTLEMENT. Fund shares are sold through the
                    Fund's distributor, Morgan Stanley Dean Witter Distributors
                    Inc., on a normal three business day basis; that is, your
                    payment for Fund shares is due on the third business day
                    (settlement day) after you place a purchase order.
 
                    SUBSEQUENT INVESTMENTS SENT DIRECTLY TO THE FUND. In
                    addition to buying additional Fund shares for an existing
                    account by contacting your Morgan Stanley Dean Witter
                    Financial Advisor, you may send a check directly to the
                    Fund. To buy additional shares in this manner:
 
                    - Write a "letter of instruction" to the Fund specifying the
                      name(s) on the account, the account number, the social
                      security or tax identification number, the Class of shares
                      you wish to purchase and the investment amount (which
                      would include any applicable front-end sales charge). The
                      letter must be signed by the account owner(s).
 
                    - Make out a check for the total amount payable to: Morgan
                      Stanley Dean Witter Utilities Fund.
 
                    - Mail the letter and check to Morgan Stanley Dean Witter
                      Trust FSB at P.O. Box 1040, Jersey City, NJ 07303.
 
8
<PAGE>
ICON                HOW TO EXCHANGE SHARES
- --------------------------------------------------------------------------------
                    PERMISSIBLE FUND EXCHANGES. You may exchange shares of any
                    Class of the Fund for the same Class of any other
                    continuously offered Multi-Class Fund, or for shares of a
                    No-Load Fund, Money Market Fund or Short-Term U.S. Treasury
                    Trust, without the imposition of an exchange fee. See the
                    inside back cover of this PROSPECTUS for each Morgan Stanley
                    Dean Witter Fund's designation as a Multi-Class Fund,
                    No-Load Fund or Money Market Fund. If a Morgan Stanley Dean
                    Witter Fund is not listed, consult the inside back cover of
                    that Fund's PROSPECTUS for its designation. For purposes of
                    exchanges, shares of FSC Funds (subject to a front-end sales
                    charge) are treated as Class A shares of a Multi-Class Fund.
 
                    Exchanges may be made after shares of the Fund acquired by
                    purchase have been held for thirty days. There is no waiting
                    period for exchanges of shares acquired by exchange or
                    dividend reinvestment. The current PROSPECTUS for each Fund
                    describes its investment objective(s), policies and
                    investment minimums, and should be read before investment.
 
                    EXCHANGE PROCEDURES. You can process an exchange by
                    contacting your Morgan Stanley Dean Witter Financial Advisor
                    or other authorized financial representative. Otherwise, you
                    must forward an exchange privilege authorization form to the
                    Fund's transfer agent -- Morgan Stanley Dean Witter Trust
                    FSB -- and then write the transfer agent or call (800)
                    869-NEWS to place an exchange order. You can obtain an
                    exchange privilege authorization form by contacting your
                    Financial Advisor or other authorized financial
                    representative or by calling (800) 869-NEWS. If you hold
                    share certificates, no exchanges may be processed until we
                    have received all applicable share certificates.
 
                    An exchange to any Morgan Stanley Dean Witter Fund (except a
                    Money Market Fund) is made on the basis of the next
                    calculated net asset values of the Funds involved after the
                    exchange instructions are accepted. When exchanging into a
                    Money Market Fund, the Fund's shares are sold at their next
                    calculated net asset value and the Money Market Fund's
                    shares are purchased at their net asset value on the
                    following business day.
 
                    The Fund may terminate or revise the exchange privilege upon
                    required notice. Certain services normally available to
                    shareholders of Money Market Funds, including the check
                    writing privilege, are not available for Money Market Fund
                    shares you acquire in an exchange.
 
                    TELEPHONE EXCHANGES. For your protection when calling Morgan
                    Stanley Dean Witter Trust FSB, we will employ reasonable
                    procedures to confirm that exchange instructions
                    communicated over the telephone are genuine. These
                    procedures may include requiring various forms of personal
                    identification such as name, mailing address, social
                    security or other tax identification number. Telephone
                    instructions also may be recorded.
 
                    Telephone instructions will be accepted if received by the
                    Fund's transfer agent between 9:00 a.m. and 4:00 p.m.
                    Eastern time, on any day the New York Stock
 
                                                                               9
<PAGE>
                    Exchange is open for business. 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 Fund in the
                    past.
 
                    MARGIN ACCOUNTS. If you have pledged your Fund shares in a
                    margin account, contact your Morgan Stanley Dean Witter
                    Financial Advisor or other authorized financial
                    representative regarding restrictions on the exchange of
                    such shares.
 
                    TAX CONSIDERATIONS OF EXCHANGES. If you exchange shares of
                    the Fund for shares of another Morgan Stanley Dean Witter
                    Fund there are important tax considerations. For tax
                    purposes, the exchange out of the Fund is considered a sale
                    of Fund shares -- and the exchange into the other Fund is
                    considered a purchase. As a result, you may realize a
                    capital gain or loss.
 
                    You should review the "Tax Consequences" section and consult
                    your own tax professional about the tax consequences of an
                    exchange.
 
                    FREQUENT EXCHANGES. A pattern of frequent exchanges may
                    result in the Fund limiting or prohibiting, at its
                    discretion, additional purchases and/or exchanges. The Fund
                    will notify you in advance of limiting your exchange
                    privileges.
 
                    CDSC CALCULATIONS ON EXCHANGES. See the "Share Class
                    Arrangements" section of this PROSPECTUS for a discussion of
                    how applicable contingent deferred sales charges (CDSCs) are
                    calculated for shares of one Morgan Stanley Dean Witter Fund
                    that are exchanged for shares of another.
 
                    FOR FURTHER INFORMATION REGARDING EXCHANGE PRIVILEGES, YOU
                    SHOULD CONTACT YOUR MORGAN STANLEY DEAN WITTER FINANCIAL
                    ADVISOR OR CALL (800) 869-NEWS.
 
ICON                HOW TO SELL SHARES
- --------------------------------------------------------------------------------
                    You can sell some or all of your Fund shares at any time. If
                    you sell Class A, Class B or Class C shares, your net sale
                    proceeds are reduced by the amount of any applicable CDSC.
                    Your shares will be sold at the next share price calculated
                    after we receive your order to sell as described below.
 
<TABLE>
<CAPTION>
 OPTIONS            PROCEDURES
<S>                 <C>
- --------------------------------------------------------------------------------
 Contact your       To sell your shares, simply call your Morgan Stanley Dean
 Financial Advisor  Witter Financial Advisor or other authorized financial
                    representative.
                    ------------------------------------------------------------
 ICON               Payment will be sent to the address to which the account is
                    registered or deposited in your brokerage account.
- --------------------------------------------------------------------------------
 By Letter          You can also sell your shares by writing a "letter of
                    instruction" that includes:
 ICON               - your account number;
                    - the dollar amount or the number of shares you wish to
                      sell;
                    - the Class of shares you wish to sell; and
                    - the signature of each owner as it appears on the account.
                    ------------------------------------------------------------
</TABLE>
 
10
<PAGE>
 
<TABLE>
<CAPTION>
 OPTIONS            PROCEDURES
<S>                 <C>
- --------------------------------------------------------------------------------
 By Letter,         If you are requesting payment to anyone other than the
 continued          registered owner(s) or that payment be sent to any address
                    other than the address of the registered owner(s) or
                    pre-designated bank account, you will need a signature
                    guarantee. You can obtain a signature guarantee from an
                    eligible guarantor acceptable to Morgan Stanley Dean Witter
                    Trust FSB. (You should contact Morgan Stanley Dean Witter
                    Trust FSB at (800) 869-NEWS for a determination as to
                    whether a particular institution is an eligible guarantor.)
                    A notary public CANNOT provide a signature guarantee.
                    Additional documentation may be required for shares held by
                    a corporation, partnership, trustee or executor.
                    ------------------------------------------------------------
                    Mail the letter to Morgan Stanley Dean Witter Trust FSB at
                    P.O. Box 983, Jersey City, New Jersey 07303. If you hold
                    share certificates, you must return the certificates, along
                    with the letter and any required additional documentation.
                    ------------------------------------------------------------
                    A check will be mailed to the name(s) and address in which
                    the account is registered, or otherwise according to your
                    instructions.
- --------------------------------------------------------------------------------
 Systematic         If your investment in all of the Morgan Stanley Dean Witter
 Withdrawal Plan    Family of Funds has a total market value of at least
 ICON               $10,000, you may elect to withdraw amounts of $25 or more,
                    or in any whole percentage of a Fund's balance (provided the
                    amount is at least $25), on a monthly, quarterly,
                    semi-annual or annual basis, from any Fund with a balance of
                    at least $1,000. Each time you add a Fund to the plan, you
                    must meet the plan requirements.
                    ------------------------------------------------------------
                    Amounts withdrawn are subject to any applicable CDSC. A CDSC
                    may be waived under certain circumstances. See the Class B
                    waiver categories listed in the "Share Class Arrangements"
                    section of this PROSPECTUS.
                    ------------------------------------------------------------
                    To sign up for the Systematic Withdrawal Plan, contact your
                    Morgan Stanley Dean Witter Financial Advisor or call (800)
                    869-NEWS. You may terminate or suspend your plan at any
                    time. Please remember that withdrawals from the plan are
                    sales of shares, not Fund "distributions," and ultimately
                    may exhaust your account balance. The Fund may terminate or
                    revise the plan at any time.
- --------------------------------------------------------------------------------
</TABLE>
 
                    PAYMENT FOR SOLD SHARES. After we receive your complete
                    instructions to sell, as described above, a check will be
                    mailed to you within seven days, although we will attempt to
                    make payment within one business day. Payment may also be
                    sent to your brokerage account.
 
                    Payment may be postponed or the right to sell your shares
                    suspended under unusual circumstances. If you request to
                    sell shares that were recently purchased by check, payment
                    of the sale proceeds may be delayed for the minimum time
                    needed to verify that the check has been honored (not more
                    than fifteen days from the time we receive the check).
 
                    TAX CONSIDERATIONS. Normally, your sale of Fund shares is
                    subject to federal and state income tax. You should review
                    the "Tax Consequences" section of this PROSPECTUS and
                    consult your own tax professional about the tax consequences
                    of a sale.
 
                    REINSTATEMENT PRIVILEGE. If you sell Fund shares and have
                    not previously exercised the reinstatement privilege, you
                    may, within 35 days after the date of sale, invest any
                    portion of the proceeds in the same Class of Fund shares at
                    their net asset value and receive a pro rata credit for any
                    CDSC paid in connection with the sale.
 
                                                                              11
<PAGE>
(SIDEBAR)
TARGETED DIVIDENDS-SM-
You may select to have your Fund distributions automatically invested in other
Classes of Fund shares or Classes of another Morgan Stanley Dean Witter Fund
that you own. Contact your Morgan Stanley Dean Witter Financial Advisor for
further information about this service.
(End Sidebar)
 
                    INVOLUNTARY SALES. The Fund reserves the right, on sixty
                    days' notice, to sell the shares of any shareholder (other
                    than shares held in an IRA or 403(b) Custodial Account)
                    whose shares, due to sales by the shareholder, have a value
                    below $100, or in the case of an account opened through
                    EASYINVEST-SM-, if after 12 months the shareholder has
                    invested less than $1,000 in the account.
 
                    However, before the Fund sells your shares in this manner,
                    we will notify you and allow you sixty days to make an
                    additional investment in an amount that will increase the
                    value of your account to at least the required amount before
                    the sale is processed. No CDSC will be imposed on any
                    involuntary sale.
 
                    MARGIN ACCOUNTS. Certain restrictions may apply to Fund
                    shares pledged in margin accounts with Dean Witter Reynolds
                    or another authorized broker-dealer of Fund shares. If you
                    hold Fund shares in this manner, please contact your Morgan
                    Stanley Dean Witter Financial Advisor or other authorized
                    financial representative for more details.
 
ICON                DISTRIBUTIONS
- --------------------------------------------------------------------------------
                    The Fund passes substantially all of its earnings from
                    income and capital gains along to its investors as
                    "distributions." The Fund earns income from stocks and
                    interest from fixed-income investments. These amounts are
                    passed along to Fund shareholders as "income dividend
                    distributions." The Fund realizes capital gains whenever it
                    sells securities for a higher price than it paid for them.
                    These amounts may be passed along as "capital gain
                    distributions."
 
                    The Fund declares income dividends separately for each
                    Class. Distributions paid on Class A and Class D shares will
                    usually be higher than for Class B and Class C because
                    distribution fees that Class B and Class C pay are higher.
                    Normally, income dividends are distributed to shareholders
                    quarterly and capital gains are distributed annually in
                    December. The Fund, however, may retain and reinvest any
                    long-term capital gains. The Fund may at times make payments
                    from sources other than income or capital gains that
                    represent a return of a portion of your investment.
 
                    Distributions are reinvested automatically in additional
                    shares of the same Class and automatically credited to your
                    account, unless you request in writing that all
                    distributions be paid in cash. If you elect the cash option,
                    the Fund will mail a check to you no later than seven
                    business days after the distribution is declared. No
                    interest will accrue on uncashed checks. If you wish to
                    change how your distributions are paid, your request should
                    be received by the Fund's transfer agent, Morgan Stanley
                    Dean Witter Trust FSB, at least five business days prior to
                    the record date of the distributions.
 
ICON                TAX CONSEQUENCES
- --------------------------------------------------------------------------------
                    As with any investment, you should consider how your Fund
                    investment will be taxed. The tax information in this
                    PROSPECTUS is provided as general information. You should
                    consult your own tax professional about the tax consequences
                    of an investment in the Fund.
 
12
<PAGE>
                    Unless your investment in the Fund is through a tax-deferred
                    retirement account, such as a 401(k) plan or IRA, you need
                    to be aware of the possible tax consequences when:
 
                    - The Fund makes distributions; and
 
                    - You sell Fund shares, including an exchange to another
                      Morgan Stanley Dean Witter Fund.
 
                    TAXES ON DISTRIBUTIONS. Your distributions are normally
                    subject to federal and state income tax when they are paid,
                    whether you take them in cash or reinvest them in Fund
                    shares. A distribution also may be subject to local income
                    tax. Any income dividend distributions and any short-term
                    capital gain distributions are taxable to you as ordinary
                    income. Any long-term capital gain distributions are taxable
                    as long-term capital gains, no matter how long you have
                    owned shares in the Fund.
 
                    Every January, you will be sent a statement (IRS Form
                    1099-DIV) showing the taxable distributions paid to you in
                    the previous year. The statement provides full information
                    on your dividends and capital gains for tax purposes.
 
                    TAXES ON SALES. Your sale of Fund shares normally is subject
                    to federal and state income tax and may result in a taxable
                    gain or loss to you. A sale also may be subject to local
                    income tax. Your exchange of Fund shares for shares of
                    another Morgan Stanley Dean Witter Fund is treated for tax
                    purposes like a sale of your original shares and a purchase
                    of your new shares. Thus, the exchange may, like a sale,
                    result in a taxable gain or loss to you and will give you a
                    new tax basis for your new shares.
 
                    When you open your Fund account, you should provide your
                    social security or tax identification number on your
                    investment application. By providing this information, you
                    will avoid being subject to a federal backup withholding tax
                    of 31% on taxable distributions and redemption proceeds. Any
                    withheld amount would be sent to the IRS as an advance tax
                    payment.
 
ICON                SHARE CLASS ARRANGEMENTS
- --------------------------------------------------------------------------------
                    The Fund offers several Classes of shares having different
                    distribution arrangements designed to provide you with
                    different purchase options according to your investment
                    needs. Your Morgan Stanley Dean Witter Financial Advisor or
                    other authorized financial representative can help you
                    decide which Class may be appropriate for you.
 
                    The general public is offered three Classes: Class A shares,
                    Class B shares and Class C shares, which differ principally
                    in terms of sales charges and ongoing expenses. A fourth
                    Class, Class D shares, is offered only to a limited category
                    of investors. Shares that you acquire through reinvested
                    distributions will not be subject to any front-end sales
                    charge or CDSC -- contingent deferred sales charge.
 
                                                                              13
<PAGE>
(Sidebar)
FRONT-END SALES
CHARGE OR FSC
An initial sales charge you pay when purchasing Class A shares that is based on
a percentage of the offering price. The percentage declines based upon the
dollar value of Class A shares you purchase. We offer three ways to reduce your
Class A sales charges -- the Combined Purchase Privilege, Right of Accumulation
and Letter of Intent.
(End Sidebar)
                    Sales personnel may receive different compensation for
                    selling each Class of shares. The sales charges applicable
                    to each Class provide for the distribution financing of
                    shares of that Class.
 
                    The chart below compares the sales charge and maximum annual
                    12b-1 fee applicable to each Class:
 
<TABLE>
<CAPTION>
                                           ANNUAL
                                           12b-1
 CLASS SALES CHARGE                         FEE
<S>   <C>                                  <C>
- ------------------------------------------------
 A    Maximum 5.25% initial sales charge
      reduced for purchase of $25,000 or
      more; shares sold without an
      initial sales charge are generally
      subject to a 1.0% CDSC during the
      first year                           0.25%
- ------------------------------------------------
 B    Maximum 5.0% CDSC during the first
      year decreasing to 0% after six
      years                                1.00%
- ------------------------------------------------
 C    1.0% CDSC during the first year      1.00%
- ------------------------------------------------
 D    None                                 None
- ------------------------------------------------
</TABLE>
 
                     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 purchases of $25,000 or more
                    according to the schedule below. Investments of $1 million
                    or more are not subject to an initial sales charge, but are
                    generally subject to a contingent deferred sales charge, or
                    CDSC, of 1.0% on sales made within one year after the last
                    day of the month of purchase. The CDSC will be assessed in
                    the same manner and with the same CDSC waivers as with Class
                    B shares. Class A shares are also subject to a distribution
                    (12b-1) fee of up to 0.25% of the average daily net assets
                    of the Class.
 
                    The offering price of Class A shares includes a sales charge
                    (expressed as a percentage of the offering price) on a
                    single transaction as shown in the following table:
 
<TABLE>
<CAPTION>
                                                      FRONT-END SALES CHARGE
                                          ----------------------------------------------
                                              PERCENTAGE OF       APPROXIMATE PERCENTAGE
 AMOUNT OF SINGLE TRANSACTION             PUBLIC OFFERING PRICE     OF 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>
 
                    The reduced sales charge schedule is applicable to purchases
                    of Class A shares in a single transaction by:
 
                    - A single account (including an individual, trust or
                      fiduciary account).
 
                    - Family member accounts (limited to husband, wife and
                      children under the age of 21).
 
                    - Pension, profit sharing or other employee benefit plans of
                      companies and their affiliates.
 
                    - Tax-exempt organizations.
 
                    - Groups organized for a purpose other than to buy mutual
                      fund shares.
 
14
<PAGE>
                    COMBINED PURCHASE PRIVILEGE. You also will have the benefit
                    of reduced sales charges by combining purchases of Class A
                    shares of the Fund in a single transaction with purchases of
                    Class A shares of other Multi-Class Funds and shares of FSC
                    Funds.
 
                    RIGHT OF ACCUMULATION. You also may benefit from a reduction
                    of sales charges if the cumulative net asset value of Class
                    A shares of the Fund purchased in a single transaction,
                    together with shares of other Funds you currently own which
                    were previously purchased at a price including a front-end
                    sales charge (including shares acquired through reinvestment
                    of distributions), amounts to $25,000 or more. Also, if you
                    have a cumulative net asset value of all your Class A and
                    Class D shares equal to at least $5 million (or $25 million
                    for certain employee benefit plans), you are eligible to
                    purchase Class D shares of any Fund subject to the Fund's
                    minimum initial investment requirement.
 
                    You must notify your Morgan Stanley Dean Witter Financial
                    Advisor or other authorized financial representative (or
                    Morgan Stanley Dean Witter Trust FSB if you purchase
                    directly through the Fund), 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 when an order is placed by mail. The
                    reduced sales charge will not be granted if: (i)
                    notification is not furnished at the time of the order; or
                    (ii) a review of the records of Dean Witter Reynolds or
                    other authorized dealer of Fund shares or the Fund's
                    transfer agent does not confirm your represented holdings.
 
                    LETTER OF INTENT. The schedule of reduced sales charges for
                    larger purchases also will be available to you if you enter
                    into a written "letter of intent." A letter of intent
                    provides for the purchase of Class A shares of the Fund or
                    other Multi-Class Funds or shares of FSC Funds within a
                    thirteen-month period. The initial purchase under a letter
                    of intent must be at least 5% of the stated investment goal.
                    To determine the applicable sales charge reduction, you may
                    also include: (1) the cost of 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 distributor receiving the letter of intent, and
                    (2) the cost of shares of other Funds you currently own
                    acquired in exchange for shares of Funds purchased during
                    that period at a price including a front-end sales charge.
                    You can obtain a letter of intent by contacting your Morgan
                    Stanley Dean Witter Financial Advisor or other authorized
                    financial representative or by calling (800) 869-NEWS. If
                    you do not achieve the stated investment goal within the
                    thirteen-month period, you are required to pay the
                    difference between the sales charges otherwise applicable
                    and sales charges actually paid.
 
                                                                              15
<PAGE>
(Sidebar)
CONTINGENT DEFERRED SALES CHARGE OR CDSC
A fee you pay when you sell shares of certain Morgan Stanley Dean Witter Funds
purchased without an initial sales charge. This fee declines the longer you hold
your shares as set forth in the table.
(End Sidebar)
 
                    OTHER FRONT-END SALES CHARGE WAIVERS. In addition to
                    investments of $1 million or more, your purchase of Class A
                    shares is not subject to a front-end sales charge (or CDSC
                    upon sale) if your account qualifies under one of the
                    following categories:
 
                    - A trust for which Morgan Stanley Dean Witter Trust FSB
                      provides discretionary trustee services.
 
                    - Persons participating in a fee-based investment program
                      (subject to all of its terms and conditions, including
                      mandatory sale or transfer restrictions on termination)
                      approved by the Fund's distributor pursuant to which they
                      pay an asset-based fee for investment advisory,
                      administrative and/or brokerage services.
 
                    - Employer-sponsored employee benefit plans, whether or not
                      qualified under the Internal Revenue Code, for which
                      Morgan Stanley Dean Witter Trust FSB serves as trustee or
                      Dean Witter Reynolds' Retirement Plan Services serves as
                      recordkeeper under a written Recordkeeping Services
                      Agreement ("MSDW Eligible Plans") which have at least 200
                      eligible employees.
 
                    - A MSDW Eligible Plan whose Class B shares have converted
                      to Class A shares, regardless of the plan's asset size or
                      number of eligible employees.
 
                    - A client of a Morgan Stanley Dean Witter Financial Advisor
                      who joined us from another investment firm within six
                      months prior to the date of purchase of Fund shares, and
                      you used the proceeds from the sale of shares of a
                      proprietary mutual fund of that Financial Advisor's
                      previous firm that imposed either a front-end or deferred
                      sales charge to purchase Class A shares, provided that:
                      (1) you sold the shares not more than 60 days prior to the
                      purchase of Fund shares, and (2) the sale proceeds were
                      maintained in the interim in cash or a money market fund.
 
                    - Current or retired Directors/Trustees of the Morgan
                      Stanley Dean Witter Funds, such persons' spouses and
                      children under the age of 21, and trust accounts for which
                      any of such persons is a beneficiary.
 
                    - Current or retired directors, officers and employees of
                      Morgan Stanley Dean Witter & Co. and any of its
                      subsidiaries, such persons' spouses and children under the
                      age of 21, and trust accounts for which any of such
                      persons is a beneficiary.
 
                     CLASS B SHARES  Class B shares are offered at net asset
                    value with no initial sales charge but are subject to a
                    contingent deferred sales charge, or CDSC, as set forth in
                    the table below. For the purpose of calculating the CDSC,
                    shares are deemed to have been purchased on the last day of
                    the month during which they were purchased.
 
<TABLE>
<CAPTION>
 YEAR SINCE PURCHASE PAYMENT MADE              CDSC AS A PERCENTAGE 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>
 
16
<PAGE>
                    Each time you place an order to sell or exchange shares,
                    shares with no CDSC will be sold or exchanged first, then
                    shares with the lowest CDSC will be sold or exchanged next.
                    For any shares subject to a CDSC, the CDSC will be assessed
                    on an amount equal to the lesser of the current market value
                    or the cost of the shares being sold.
 
                    CDSC WAIVERS. A CDSC, if otherwise applicable, will be
                    waived in the case of:
 
                    - Sales of shares held at the time you die or become
                      disabled (within the definition in Section 72(m)(7) of the
                      Internal Revenue Code which relates to the ability to
                      engage in gainful employment), if the shares are: (i)
                      registered either in your name (not a trust) or in the
                      names of you and your spouse as joint tenants with right
                      of survivorship; or (ii) held in a qualified corporate or
                      self-employed retirement plan, IRA or 403(b) Custodial
                      Account, provided in either case that the sale is
                      requested within one year of your death or initial
                      determination of disability.
 
                    - Sales in connection with the following retirement plan
                      "distributions": (i) 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); (ii) distributions from an IRA or 403(b)
                      Custodial Account following attainment of age 59 1/2; or
                      (iii) a tax-free return of an excess IRA contribution (a
                      "distribution" does not include a direct transfer of IRA,
                      403(b) Custodial Account or retirement plan assets to a
                      successor custodian or trustee).
 
                    - Sales of shares held for you as a participant in a MSDW
                      Eligible Plan.
 
                    - Sales of shares in connection with the Systematic
                      Withdrawal Plan of up to 12% annually of the value of each
                      Fund from which plan sales are made. The percentage is
                      determined on the date you establish the Systematic
                      Withdrawal Plan and based on the next calculated share
                      price. You may have this CDSC waiver applied in amounts up
                      to 1% per month, 3% per quarter, 6% semi-annually or 12%
                      annually. Shares with no CDSC will be sold first, followed
                      by those with the lowest CDSC. As such, the waiver benefit
                      will be reduced by the amount of your shares that are not
                      subject to a CDSC. If you suspend your participation in
                      the plan, you may later resume plan payments without
                      requiring a new determination of the account value for the
                      12% CDSC waiver.
 
                    All waivers will be granted only following the Distributor
                    receiving confirmation of your entitlement. If you believe
                    you are eligible for a CDSC waiver, please contact your
                    Financial Advisor or call (800) 869-NEWS.
 
                    DISTRIBUTION FEE. Class B shares are subject to an annual
                    12b-1 fee of 1.0% of the lesser of: (a) the average daily
                    aggregate gross purchases by all shareholders of the Fund's
                    Class B shares since the inception of the Fund (not
                    including reinvestments of dividends or capital gains
                    distributions), less the average daily aggregate net asset
                    value of the Fund's Class B shares sold by all shareholders
                    since the Fund's inception upon which a CDSC has been
                    imposed or waived or (b) the average daily net assets of
                    Class B.
 
                                                                              17
<PAGE>
                    CONVERSION FEATURE. After ten (10) years, Class B shares
                    will convert automatically to Class A shares of the Fund
                    with no initial sales charge. The ten year period runs 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, from the last day of the month in which the
                    original Class B shares were purchased; the shares will
                    convert to Class A shares based on their relative net asset
                    values in the month following the ten year period. At the
                    same time, an equal proportion of Class B shares acquired
                    through automatically reinvested distributions will convert
                    to Class A shares on the same basis. (Class B shares held
                    before May 1, 1997, however, will convert to Class A shares
                    in May 2007.)
                    In the case of Class B shares held in a MSDW Eligible Plan,
                    the plan is treated as a single investor and all Class B
                    shares will convert to Class A shares on the conversion date
                    of the Class B shares of a Morgan Stanley Dean Witter Fund
                    purchased by that plan.
 
                    Currently, the Class B share conversion is not a taxable
                    event; the conversion feature may be cancelled if it is
                    deemed a taxable event in the future by the Internal Revenue
                    Service.
                    If you exchange your Class B shares for shares of a Money
                    Market Fund, No-Load Fund or Short-Term U.S. Treasury Trust,
                    the holding period for conversion is frozen as of the last
                    day of the month of the exchange and resumes on the last day
                    of the month you exchange back into Class B shares.
                    EXCHANGING SHARES SUBJECT TO A CDSC. There are special
                    considerations when you exchange Fund shares that are
                    subject to a CDSC. When determining the length of time you
                    held the shares and the corresponding CDSC rate, any period
                    (starting at the end of the month) during which you held
                    shares of a fund that does NOT charge a CDSC WILL NOT BE
                    COUNTED. Thus, in effect the "holding period" for purposes
                    of calculating the CDSC is frozen upon exchanging into a
                    fund that does not charge a CDSC.
                    For example, if you held Class B shares of the Fund for one
                    year, exchanged to Class B of another Morgan Stanley Dean
                    Witter Multi-Class Fund for another year, then sold your
                    shares, a CDSC rate of 4% would be imposed on the shares
                    based on a two year holding period -- one year for each
                    Fund. However, if you had exchanged the shares of the Fund
                    for a Money Market Fund (which does not charge a CDSC)
                    instead of the Multi-Class Fund, then sold your shares, a
                    CDSC rate of 5% would be imposed on the shares based on a
                    one year holding period. The one year in the Money Market
                    Fund would not be counted. Nevertheless, if shares subject
                    to a CDSC are exchanged for a Fund that does not charge a
                    CDSC, you will receive a credit when you sell the shares
                    equal to the distribution (12b-1) fees, if any, you paid on
                    those shares while in that Fund up to the amount of any
                    applicable CDSC.
 
                    In addition, shares that are exchanged into or from a Morgan
                    Stanley Dean Witter Fund subject to a higher CDSC rate will
                    be subject to the higher rate, even if the shares are
                    re-exchanged into a Fund with a lower CDSC rate.
 
18
<PAGE>
                     CLASS C SHARES  Class C shares are sold at net asset value
                    with no initial sales charge but are subject to a CDSC of up
                    to 1.0% on sales made within one year after the last day of
                    the month of purchase. The CDSC will be assessed in the same
                    manner and with the same CDSC waivers as with Class B
                    shares.
 
                    DISTRIBUTION FEE. Class C shares are subject to an annual
                    distribution (12b-1) fee of up to 1.0% of the average daily
                    net assets of that Class. 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. Unlike Class
                    B shares, Class C shares have no conversion feature and,
                    accordingly, an investor that purchases Class C shares may
                    be subject to distribution (12b-1) fees applicable to Class
                    C shares for an indefinite period.
 
                     CLASS D SHARES  Class D shares are offered without any
                    sales charge on purchases or sales and without any
                    distribution (12b-1) fee. Class D shares are offered only to
                    investors meeting an initial investment minimum of $5
                    million ($25 million for MSDW Eligible Plans) and the
                    following investor categories:
 
                    - Investors participating in the Investment Manager's mutual
                      fund asset allocation program (subject to all of its terms
                      and conditions, including mandatory sale or transfer
                      restrictions on termination) pursuant to which they pay an
                      asset-based fee.
 
                    - Persons participating in a fee-based investment program
                      (subject to all of its terms and conditions, including
                      mandatory sale or transfer restrictions on termination)
                      approved by the Fund's distributor pursuant to which they
                      pay an asset-based fee for investment advisory,
                      administrative and/or brokerage services.
 
                    - Employee benefit plans maintained by Morgan Stanley Dean
                      Witter & Co. or any of its subsidiaries for the benefit of
                      certain employees of Morgan Stanley Dean Witter & Co. and
                      its subsidiaries.
 
                    - Certain unit investment trusts sponsored by Dean Witter
                      Reynolds.
 
                    - Certain other open-end investment companies whose shares
                      are distributed by the Fund's distributor.
 
                    - Investors who were shareholders of the Dean Witter
                      Retirement Series on September 11, 1998 for additional
                      purchases for their former Dean Witter Retirement Series
                      accounts.
 
                    MEETING CLASS D ELIGIBILITY MINIMUMS. To meet the $5 million
                    ($25 million for certain MSDW Eligible Plans) initial
                    investment to qualify to purchase Class D shares you may
                    combine: (1) purchases in a single transaction of Class D
                    shares of the Fund and other Morgan Stanley Dean Witter
                    Multi-Class Funds and/or (2) previous purchases of Class A
                    and Class D shares of Multi-Class Funds and shares of FSC
                    Funds you currently own, along with shares of Morgan Stanley
                    Dean Witter Funds you currently own that you acquired in
                    exchange for those shares.
 
                                                                              19
<PAGE>
                     NO SALES CHARGES FOR REINVESTED CASH DISTRIBUTIONS  If you
                    receive a cash payment representing an income dividend or
                    capital gain and you reinvest that amount in the applicable
                    Class of shares by returning the check within 30 days of the
                    payment date, the purchased shares would not be subject to
                    an initial sales charge or CDSC.
 
                     PLAN OF DISTRIBUTION (RULE 12B-1 FEES)  The Fund has
                    adopted a Plan of Distribution in accordance with Rule 12b-1
                    under the Investment Company Act of 1940 with respect to the
                    distribution of Class A, Class B and Class C shares. The
                    Plan allows the Fund to pay distribution fees for the sale
                    and distribution of these shares. It also allows the Fund to
                    pay for services to shareholders of Class A, Class B and
                    Class C shares. Because these fees are paid out of the
                    Fund's assets on an ongoing basis, over time these fees will
                    increase the cost of your investment in these Classes and
                    may cost you more than paying other types of sales charges.
 
20
<PAGE>
FINANCIAL HIGHLIGHTS
 
        The financial highlights table is intended to help you understand the
        Fund's financial performance for the past 5 fiscal years of the Fund.
        Certain information reflects financial results for a single Fund share.
        The total returns in the table represent the rate an investor would have
        earned or lost on an investment in the Fund (assuming reinvestment of
        all dividends and distributions).
 
        This information has been audited by PricewaterhouseCoopers LLP, whose
        report, along with the Fund's financial statements, is included in the
        annual report, which is available upon request.
 
<TABLE>
<CAPTION>
CLASS B SHARES
- ----------------------------------------------------------------------------------------
 YEARS ENDED DECEMBER 31                 1998++    1997*++    1996      1995      1994
<S>                                      <C>       <C>       <C>       <C>       <C>
- ----------------------------------------------------------------------------------------
 
 SELECTED PER SHARE DATA:
- ----------------------------------------------------------------------------------------
 Net asset value, beginning of period    $ 17.04   $ 15.22   $ 15.15   $ 12.30   $ 14.34
- ----------------------------------------------------------------------------------------
 INCOME (LOSS) FROM INVESTMENT
OPERATIONS:
    Net investment income (loss)            0.40      0.50      0.56      0.58      0.63
    Net realized and unrealized gain
    (loss)                                  3.25      3.28      0.16      2.85     (2.04)
                                         -------   -------   -------   -------   -------
 Total income (loss) from investment
 operations                                 3.65      3.78      0.72      3.43     (1.41)
- ----------------------------------------------------------------------------------------
 LESS DIVIDENDS AND DISTRIBUTIONS FROM:
    Net investment income                  (0.41)    (0.51)    (0.58)    (0.58)    (0.61)
    Net realized gain                      (1.02)    (1.45)    (0.07)       --     (0.02)
                                         -------   -------   -------   -------   -------
 Total dividends and distributions         (1.43)    (1.96)    (0.65)    (0.58)    (0.63)
- ----------------------------------------------------------------------------------------
 Net asset value, end of period          $ 19.26   $ 17.04   $ 15.22   $ 15.15   $ 12.30
- ----------------------------------------------------------------------------------------
 
 TOTAL RETURN+                             21.95%    25.79%     4.99%    28.42%    (9.90)%
- ----------------------------------------------------------------------------------------
 
 RATIOS TO AVERAGE NET ASSETS:
- ----------------------------------------------------------------------------------------
 Expenses                                   1.65%(1)    1.67%    1.64%    1.65%     1.64%
- ----------------------------------------------------------------------------------------
 Net investment income (loss)               2.23%(1)    3.15%    3.63%    4.19%     4.67%
- ----------------------------------------------------------------------------------------
 
 SUPPLEMENTAL DATA:
- ----------------------------------------------------------------------------------------
 Net assets, end of period, in millions  $ 2,752   $ 2,430   $ 2,677   $ 3,321   $ 2,827
- ----------------------------------------------------------------------------------------
 Portfolio turnover rate                       6%        6%        7%        9%       11%
- ----------------------------------------------------------------------------------------
</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 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 held
  by those employee benefit plans prior to July 28, 1997 have been designated
  Class D shares.
++ The per share amounts were computed using an average number of shares
outstanding during the period.
+ 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) Reflects overall Fund ratios for investment income and non-class specific
expenses.
 
                                                                              21
<PAGE>
 
<TABLE>
<CAPTION>
CLASS A SHARES++
- ------------------------------------------------------------------------------------------
                                                                                 FOR THE
                                                                    FOR THE    PERIOD JULY
                                                                     YEAR       28, 1997*
                                                                     ENDED       THROUGH
                                                                   DECEMBER     DECEMBER
 SELECTED PER SHARE DATA:                                          31, 1998     31, 1997
<S>                                                                <C>         <C>
- ------------------------------------------------------------------------------------------
 Net asset value, beginning of period                              $17.01         $15.89
- ------------------------------------------------------------------------------------------
 INCOME FROM INVESTMENT OPERATIONS:
    Net investment income                                            0.54           0.27
    Net realized and unrealized gain                                 3.24           2.52
                                                                   ---------   -----------
 Total income from investment operations                             3.78           2.79
- ------------------------------------------------------------------------------------------
 LESS DIVIDENDS AND DISTRIBUTIONS FROM:
    Net investment income                                           (0.55)         (0.35)
    Net realized gain                                               (1.02)         (1.32)
                                                                   ---------   -----------
 Total dividends and distributions                                  (1.57)         (1.67)
- ------------------------------------------------------------------------------------------
 Net asset value, end of period                                    $19.22         $17.01
- ------------------------------------------------------------------------------------------
 
 TOTAL RETURN+                                                      22.86%         18.06%(1)
- ------------------------------------------------------------------------------------------
 
 RATIOS TO AVERAGE NET ASSETS:
- ------------------------------------------------------------------------------------------
 Expenses                                                            0.90%(3)       0.92%(2)
- ------------------------------------------------------------------------------------------
 Net investment income                                               2.98%(3)       4.05%(2)
- ------------------------------------------------------------------------------------------
 
 SUPPLEMENTAL DATA:
- ------------------------------------------------------------------------------------------
 Net assets, end of period, in thousands                           $10,357        $3,581
- ------------------------------------------------------------------------------------------
 Portfolio turnover rate                                                6%             6%
- ------------------------------------------------------------------------------------------
</TABLE>
 
<TABLE>
<CAPTION>
CLASS C SHARES++
- ------------------------------------------------------------------------------------------
 SELECTED PER SHARE DATA:
<S>                                                                <C>         <C>
- ------------------------------------------------------------------------------------------
 Net asset value, beginning of period                              $17.06         $15.89
- ------------------------------------------------------------------------------------------
 INCOME FROM INVESTMENT OPERATIONS:
    Net investment income                                            0.40           0.22
    Net realized and unrealized gain                                 3.25           2.51
                                                                   ---------   -----------
 Total income from investment operations                             3.65           2.73
- ------------------------------------------------------------------------------------------
 LESS DIVIDENDS AND DISTRIBUTIONS FROM:
    Net investment income                                           (0.43)         (0.24)
    Net realized gain                                               (1.02)         (1.32)
                                                                   ---------   -----------
 Total dividends and distributions                                  (1.45)         (1.56)
- ------------------------------------------------------------------------------------------
 Net asset value, end of period                                    $19.26         $17.06
- ------------------------------------------------------------------------------------------
 
 TOTAL RETURN+                                                      21.92%         17.67%(1)
- ------------------------------------------------------------------------------------------
 
 RATIOS TO AVERAGE NET ASSETS:
- ------------------------------------------------------------------------------------------
 Expenses                                                            1.65%(3)       1.69%(2)
- ------------------------------------------------------------------------------------------
 Net investment income                                               2.23%(3)       3.14%(2)
- ------------------------------------------------------------------------------------------
 
 SUPPLEMENTAL DATA:
- ------------------------------------------------------------------------------------------
 Net assets, end of period, in thousands                           $6,532         $1,405
- ------------------------------------------------------------------------------------------
 Portfolio turnover rate                                                6%             6%
- ------------------------------------------------------------------------------------------
</TABLE>
 
* The date shares were first issued.
++ The per share amounts were computed using an average number of shares
outstanding during the period.
+ 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.
(3) Reflects overall Fund ratios for investment income and non-class specific
expenses.
 
22
<PAGE>
 
<TABLE>
<CAPTION>
CLASS D SHARES++
- --------------------------------------------------------------------------------------
                                                                              FOR THE
                                                                               PERIOD
                                                                   FOR THE    JULY 28,
                                                                     YEAR      1997*
                                                                    ENDED     THROUGH
                                                                   DECEMBER   DECEMBER
 SELECTED PER SHARE DATA:                                          31, 1998   31, 1997
<S>                                                                <C>        <C>
- --------------------------------------------------------------------------------------
 Net asset value, beginning of period                              $ 16.99    $ 15.89
- --------------------------------------------------------------------------------------
 INCOME FROM INVESTMENT OPERATIONS:
    Net investment income                                             0.58       0.22
    Net realized and unrealized gain                                  3.25       2.58
                                                                   --------   --------
 Total income from investment operations                              3.83       2.80
- --------------------------------------------------------------------------------------
 LESS DIVIDENDS AND DISTRIBUTIONS FROM:
    Net investment income                                            (0.59)     (0.38)
    Net realized gain                                                (1.02)     (1.32)
                                                                   --------   --------
 Total dividends and distributions                                   (1.61)     (1.70)
- --------------------------------------------------------------------------------------
 Net asset value, end of period                                    $ 19.21    $ 16.99
- --------------------------------------------------------------------------------------
 
 TOTAL RETURN+                                                       23.21%     18.13%(1)
- --------------------------------------------------------------------------------------
 
 RATIOS TO AVERAGE NET ASSETS:
- --------------------------------------------------------------------------------------
 Expenses                                                             0.65%(3)    0.67%(2)
- --------------------------------------------------------------------------------------
 Net investment income                                                3.23%(3)    4.21%(2)
- --------------------------------------------------------------------------------------
 
 SUPPLEMENTAL DATA:
- --------------------------------------------------------------------------------------
 Net assets, end of period, in thousands                           $24,920    $17,106
- --------------------------------------------------------------------------------------
 Portfolio turnover rate                                                 6%         6%
- --------------------------------------------------------------------------------------
</TABLE>
 
* The date shares were first issued. Shareholders who held shares of the Fund
  prior to July 28, 1997 (the date the Fund converted to a multiple class share
  structure) should refer to the Financial Highlights of Class B to obtain the
  historical per share data and ratio information of their shares.
++ The per share amounts were computed using an average number of shares
outstanding during the period.
+ Calculated based on the net asset value as of the last business day of the
period.
(1) Not annualized.
(2) Annualized.
(3) Reflects overall Fund ratios for investment income and non-class specific
expenses.
 
                                                                              23
<PAGE>
NOTES
 
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24
<PAGE>
MORGAN STANLEY DEAN WITTER
FAMILY OF FUNDS
                             The Morgan Stanley Dean Witter Family of Funds
                             offers investors a wide range of investment
                             choices. Come on in and meet the family!
 
- --------------------------------------------------------------------------------
 GROWTH FUNDS
- --------------------------------
GROWTH FUNDS
Aggressive Equity Fund
American Opportunities Fund
Capital Growth Securities
Developing Growth Securities
Equity Fund
Growth Fund
Market Leader Trust
Mid-Cap Growth Fund
Special Value Fund
Value Fund
 
THEME FUNDS
Financial Services Trust
Health Sciences Trust
Information Fund
Natural Resource Development Securities
Precious Metals and Minerals Trust
 
GLOBAL/INTERNATIONAL FUNDS
Competitive Edge Fund - "Best Ideas" Portfolio
European Growth Fund
Fund of Funds - International Portfolio
Global Dividend Growth Securities
International SmallCap Fund
Japan Fund
Pacific Growth Fund
 
- --------------------------------------------------------------------------------
 GROWTH AND INCOME FUNDS
- --------------------------------
Balanced Growth Fund
Balanced Income Fund
Convertible Securities Trust
Dividend Growth Securities
Fund of Funds - Domestic Portfolio
Income Builder Fund
Mid-Cap Dividend Growth Securities
S&P 500 Index Fund
S&P 500 Select Fund
Strategist Fund
Value-Added Market Series/Equity Portfolio
 
THEME FUNDS
Global Utilities Fund
Real Estate Fund
Utilities Fund
 
- --------------------------------------------------------------------------------
 INCOME FUNDS
- --------------------------------
GOVERNMENT INCOME FUNDS
Federal Securities Trust
Short-Term U.S. Treasury Trust
U.S. Government Securities Trust
 
DIVERSIFIED INCOME FUNDS
Diversified Income Trust
 
CORPORATE INCOME FUNDS
High Yield Securities
Intermediate Income Securities
Short-Term Bond Fund (NL)
 
GLOBAL INCOME FUNDS
World Wide Income Trust
 
TAX-FREE INCOME FUNDS
California Tax-Free Income Fund
Hawaii Municipal Trust (FSC)
Limited Term Municipal Trust (NL)
Multi-State Municipal Series Trust (FSC)
New York Tax-Free Income Fund
Tax-Exempt Securities Trust
 
- --------------------------------------------------------------------------------
 MONEY MARKET FUNDS
- --------------------------------
TAXABLE MONEY MARKET FUNDS
Liquid Asset Fund (MM)
U.S. Government Money Market Trust (MM)
 
TAX-FREE MONEY MARKET FUNDS
California Tax-Free Daily Income Trust (MM)
N.Y. Municipal Money Market Trust (MM)
Tax-Free Daily Income Trust (MM)
There may be Funds created after this PROSPECTUS was published. Please consult
the inside front cover of a new Fund's prospectus for its designation, e.g.,
Multi-Class Fund or Money Market Fund.
Unless otherwise noted, each listed Morgan Stanley Dean Witter Fund, except for
Short-Term U.S. Trust, is a Multi-Class Fund. A Multi-Class Fund is a mutual
fund offering multiple Classes of shares. The other types of funds are: NL -
No-Load (Mutual) Fund; MM - Money Market Fund; FSC - A mutual fund sold with a
front-end sales charge and a distribution (12b-1) fee.
<PAGE>
MORGAN STANLEY DEAN WITTER
UTILITIES FUND
TICKER SYMBOLS
- ----------------
Class A: UTLAX
Class B: UTLBX
Class C: UTLCX
Class D: UTLDX
 
                    Additional information about the Fund's investments is
                    available in the Fund's ANNUAL AND SEMI-ANNUAL REPORTS TO
                    SHAREHOLDERS. In the Fund's ANNUAL REPORT, you will find a
                    discussion of the market conditions and investment
                    strategies that significantly affected the Fund's
                    performance during its last fiscal year. The Fund's
                    STATEMENT OF ADDITIONAL INFORMATION also provides additional
                    information about the Fund. The STATEMENT OF ADDITIONAL
                    INFORMATION is incorporated herein by reference (legally is
                    part of this PROSPECTUS). For a free copy of any of these
                    documents, to request other information about the Fund, or
                    to make shareholder inquiries, please call:
 
                                           (800) 869-NEWS
 
                    You also may obtain information about the Fund by calling
                    your Morgan Stanley Dean Witter Financial Advisor or by
                    visiting our Internet site at:
 
                                      WWW.DEANWITTER.COM/FUNDS
 
                    Information about the Fund (including the STATEMENT OF
                    ADDITIONAL INFORMATION) can be viewed and copied at the
                    Securities and Exchange Commission's Public Reference Room
                    in Washington, DC. Information about the Reference Room's
                    operations may be obtained by calling the SEC at (800)
                    SEC-0330. Reports and other information about the Fund are
                    available on the SEC's Internet site (www.sec.gov), and
                    copies of this information may be obtained, upon payment of
                    a duplicating fee, by writing the Public Reference Section
                    of the SEC, Washington, DC 20549-6009.
 
(INVESTMENT COMPANY ACT FILE NO. 811-5415)


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