MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
497, 1998-08-10
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<PAGE>
PROSPECTUS
 
                 MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST
 
    MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST (THE "TRUST") (FORMERLY NAMED
PRIME INCOME TRUST) IS A NON-DIVERSIFIED, CLOSED-END MANAGEMENT INVESTMENT
COMPANY WHICH SEEKS TO PROVIDE A HIGH LEVEL OF CURRENT INCOME CONSISTENT WITH
THE PRESERVATION OF CAPITAL. THE TRUST SEEKS TO ACHIEVE ITS INVESTMENT OBJECTIVE
THROUGH INVESTMENT PRIMARILY IN INTERESTS IN SENIOR COLLATERALIZED LOANS
("SENIOR LOANS") TO CORPORATIONS, PARTNERSHIPS AND OTHER ENTITIES ("BORROWERS").
AN INVESTMENT IN THE TRUST MAY NOT BE APPROPRIATE FOR ALL INVESTORS, AND THERE
IS NO ASSURANCE THAT THE TRUST WILL ACHIEVE ITS INVESTMENT OBJECTIVE.
 
    SENIOR LOANS IN WHICH THE TRUST MAY INVEST GENERALLY WILL PAY INTEREST AT
RATES WHICH FLOAT OR ARE RESET AT A MARGIN ABOVE A GENERALLY RECOGNIZED BASE
LENDING RATE. THESE BASE LENDING RATES ARE GENERALLY THE PRIME RATE QUOTED BY A
MAJOR U.S. BANK, THE LONDON INTER-BANK OFFERED RATE, THE CERTIFICATE OF DEPOSIT
RATE OR OTHER BASE LENDING RATES USED BY COMMERCIAL LENDERS. THE INVESTMENT
ADVISOR BELIEVES THAT OVER TIME THE EFFECTIVE YIELD OF THE TRUST WILL EXCEED
MONEY MARKET RATES AND WILL TRACK THE MOVEMENTS OF THE PUBLISHED PRIME RATE OF
MAJOR U.S. BANKS.
 
    THE BOARD OF TRUSTEES OF THE TRUST CURRENTLY INTENDS, EACH QUARTER, TO
CONSIDER AUTHORIZING THE TRUST TO MAKE TENDER OFFERS FOR ALL OR A PORTION OF ITS
OUTSTANDING SHARES OF BENEFICIAL INTEREST (THE "SHARES") AT THE THEN CURRENT NET
ASSET VALUE OF THE SHARES. AN EARLY WITHDRAWAL CHARGE PAYABLE TO MORGAN STANLEY
DEAN WITTER ADVISORS INC. (THE "INVESTMENT ADVISOR" OR "MSDW ADVISORS") OF UP TO
3.0% OF THE ORIGINAL PURCHASE PRICE OF SHARES WILL BE IMPOSED ON MOST SHARES
HELD FOR FOUR YEARS OR LESS WHICH ARE PURCHASED BY THE TRUST PURSUANT TO TENDER
OFFERS. SEE "SHARE REPURCHASES AND TENDERS." NEITHER THE TRUST NOR THE
INVESTMENT ADVISOR INTENDS TO MAKE A SECONDARY MARKET IN THE SHARES AT ANY TIME.
ACCORDINGLY, THERE IS NOT EXPECTED TO BE ANY SECONDARY TRADING MARKET IN THE
SHARES, AND AN INVESTMENT IN THE SHARES SHOULD BE CONSIDERED ILLIQUID.
 
    THE TRUST CONTINUOUSLY OFFERS SHARES THROUGH MORGAN STANLEY DEAN WITTER
DISTRIBUTORS INC. (THE "DISTRIBUTOR"), AS PRINCIPAL UNDERWRITER OF THE SHARES,
THROUGH CERTAIN DEALERS, INCLUDING DEAN WITTER REYNOLDS INC. ("DWR"), WHO HAVE
ENTERED INTO SELECTED DEALER AGREEMENTS WITH THE DISTRIBUTOR, AT A PRICE EQUAL
TO THE THEN CURRENT NET ASSET VALUE PER SHARE. THERE IS NO INITIAL SALES CHARGE
ON PURCHASES OF THE SHARES. THE INVESTMENT ADVISOR USES ITS OWN ASSETS, WHICH
MAY INCLUDE PROFITS FROM THE ADVISORY FEE PAYABLE UNDER ITS INVESTMENT ADVISORY
AGREEMENT WITH THE TRUST, AS WELL AS BORROWED FUNDS, TO COMPENSATE DEALERS
PARTICIPATING IN THE CONTINUOUS OFFERING. SEE "PURCHASE OF SHARES."
 
    MORGAN STANLEY DEAN WITTER ADVISORS INC., AN AFFILIATE OF MORGAN STANLEY
DEAN WITTER DISTRIBUTORS INC., ACTS AS INVESTMENT ADVISOR FOR THE TRUST. THE
ADDRESS OF THE TRUST IS TWO WORLD TRADE CENTER, NEW YORK, NEW YORK 10048, AND
ITS TELEPHONE NUMBER IS (212) 392-1600. INVESTORS ARE ADVISED TO READ THIS
PROSPECTUS CAREFULLY AND RETAIN IT FOR FUTURE REFERENCE.
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
    ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
                                     CONTRARY IS A CRIMINAL OFFENSE.
 
                  MORGAN STANLEY DEAN WITTER DISTRIBUTORS INC.
 
JANUARY 23, 1998
REVISED JULY 28, 1998
<PAGE>
    NO DEALER, SALESMAN OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATION NOT CONTAINED IN THIS PROSPECTUS AND,
IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION MUST NOT BE RELIED UPON AS
HAVING BEEN AUTHORIZED BY THE TRUST OR THE PRINCIPAL UNDERWRITER. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO
BUY ANY OF THE SECURITIES OFFERED HEREBY IN ANY JURISDICTION TO ANY PERSON TO
WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER IN SUCH JURISDICTION.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
Summary of Trust Expenses...............................................      3
Financial Highlights....................................................      4
Prospectus Summary......................................................      5
The Trust and its Advisor...............................................      9
Investment Objective and Policies.......................................     11
  Special Risk Factors..................................................     14
Investment Practices....................................................     16
Investment Restrictions.................................................     18
Trustees and Officers...................................................     20
Investment Advisory Agreement...........................................     25
Administrator and Administration Agreement..............................     26
Portfolio Transactions..................................................     27
Determination of Net Asset Value........................................     28
Dividends and Distributions.............................................     28
Taxation................................................................     29
Description of Shares...................................................     30
Share Repurchases and Tenders...........................................     32
Purchase of Shares......................................................     33
Yield Information.......................................................     34
Custodian, Dividend Disbursing and Transfer Agent.......................     34
Reports to Shareholders.................................................     35
Legal Counsel...........................................................     35
Experts.................................................................     35
Additional Information..................................................     35
Report of Independent Accountants.......................................     36
Financial Statements--September 30, 1997................................     37
Appendix A..............................................................     50
</TABLE>
 
                            ------------------------
 
2
<PAGE>
SUMMARY OF TRUST EXPENSES
- --------------------------------------------------------------------------------
 
The expenses and fees set forth in the table are for the fiscal year ended
September 30, 1997.
 
<TABLE>
<CAPTION>
SHAREHOLDER TRANSACTION EXPENSES
- --------------------------------------------------
<S>                                                 <C>
Sales Load Imposed on Purchases...................   None
Sales Load Imposed on Reinvested Dividends........   None
Early Withdrawal Charge...........................   3.0%
</TABLE>
 
An early withdrawal charge is imposed on tenders at the following declining
rates:
 
<TABLE>
<CAPTION>
                                                       EARLY
                                                    WITHDRAWAL
YEAR AFTER PURCHASE                                   CHARGE
- --------------------------------------------------  -----------
<S>                                                 <C>
First.............................................   3.0%
Second............................................   2.5%
Third.............................................   2.0%
Fourth............................................   1.0%
Fifth and thereafter..............................   None
</TABLE>
 
<TABLE>
<S>                                                 <C>
ANNUAL EXPENSES (AS A PERCENTAGE OF NET ASSETS)
Investment Advisory Fees..........................  0.87%
Interest Payments on Borrowed Funds...............   None
Sum of Other Expenses.............................  0.53%
Total Annual Expenses.............................  1.40%
</TABLE>
 
<TABLE>
<CAPTION>
EXAMPLE                                   1 YEAR   3 YEARS   5 YEARS   10 YEARS
- ----------------------------------------  ------   -------   -------   --------
<S>                                       <C>      <C>       <C>       <C>
You would pay the following expenses on
 a $1,000 investment, assuming (1) 5%
 annual return and (2) tender at the end
 of each time period:...................   $44       $64       $77       $168
You would pay the following expenses on
 the same investment, assuming no
 tender:................................   $14       $44       $77       $168
</TABLE>
 
THE ABOVE EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE
EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF THE TRUST MAY BE GREATER OR LESS
THAN THOSE SHOWN.
 
The purpose of this table is to assist the investor in understanding the various
costs and expenses that an investor in the Trust will bear directly or
indirectly. For a more complete description of these costs and expenses, see the
cover page of this Prospectus and "Investment Advisory Agreement,"
"Administrator and Administration Agreement" and "Share Repurchases and
Tenders--Early Withdrawal Charge" in this Prospectus.
 
                                                                               3
<PAGE>
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
 
The following ratios and per share data for a share of beneficial interest
outstanding throughout each period have been audited by PricewaterhouseCoopers
LLP, independent accountants. This data should be read in conjunction with the
financial statements, and notes thereto, and the unqualified report of
independent accountants which are contained in this Prospectus commencing on
page 36. As noted in the financial statements and in the report of
PricewaterhouseCoopers LLP, the Trust invests primarily in senior collateralized
loans which values have been determined in accordance with the procedures
adopted by the Trustees in the absence of readily ascertainable market values.
 
<TABLE>
<CAPTION>
                                                                                                                FOR THE
                                                                                                                 PERIOD
                                                                                                                NOVEMBER
                                                                                                               30, 1989*
                                                      FOR THE YEAR ENDED SEPTEMBER 30,                          THROUGH
                               ------------------------------------------------------------------------------  SEPTEMBER
                                  1997       1996       1995        1994       1993       1992        1991      30, 1990
                               ----------  ---------  ---------  ----------  ---------  ---------  ----------  ----------
<S>                            <C>         <C>        <C>        <C>         <C>        <C>        <C>         <C>
PER SHARE OPERATING
 PERFORMANCE:
Net asset value, beginning of
 period....................... $    9.94   $   9.99   $  10.00   $    9.91   $   9.99   $  10.00   $   10.00   $   10.00
                               ----------  ---------  ---------  ----------  ---------  ---------  ----------  ----------
  Net investment income.......      0.75       0.74       0.82        0.62       0.55       0.62        0.84        0.74
  Net realized and unrealized
   gain (loss)................        --      (0.04)      0.01        0.09      (0.08)     (0.01)         --       (0.01)
                               ----------  ---------  ---------  ----------  ---------  ---------  ----------  ----------
  Total from investment
   operations.................      0.75       0.70       0.83        0.71       0.47       0.61        0.84        0.73
                               ----------  ---------  ---------  ----------  ---------  ---------  ----------  ----------
  Less dividends and
   distributions from:
    Net investment income.....     (0.74)     (0.75)     (0.81)      (0.62)     (0.55)     (0.62)      (0.84)      (0.73)
    Net realized gain.........        --         --      (0.03)         --         --         --          --          --
                               ----------  ---------  ---------  ----------  ---------  ---------  ----------  ----------
Total dividends and
 distributions................     (0.74)     (0.75)     (0.84)      (0.62)     (0.55)     (0.62)      (0.84)      (0.73)
                               ----------  ---------  ---------  ----------  ---------  ---------  ----------  ----------
Net asset value, end of
 period....................... $    9.95   $   9.94   $   9.99   $   10.00   $   9.91   $   9.99   $   10.00   $   10.00
                               ----------  ---------  ---------  ----------  ---------  ---------  ----------  ----------
                               ----------  ---------  ---------  ----------  ---------  ---------  ----------  ----------
TOTAL INVESTMENT RETURN+......      7.78%      7.25%      8.57%       7.32%      4.85%      6.23%       8.77%       7.57%(1)
RATIOS TO AVERAGE NET ASSETS:
  Expenses....................      1.40%      1.46%      1.52%       1.60%      1.45%      1.47%       1.52%       1.48%(2)
  Net investment income.......      7.53%      7.50%      8.11%       6.14%      5.53%      6.14%       8.23%       8.95%(2)
SUPPLEMENTAL DATA:
  Net assets, end of period,
   in thousands............... $1,344,603   $939,471   $521,361    $305,034   $311,479   $413,497    $479,941   $328,189
Portfolio turnover rate.......        86%        72%       102%        147%        92%        46%         42%         35%(1)
</TABLE>
 
- --------------------------
 *  COMMENCEMENT OF OPERATIONS.
 
 +  DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE. CALCULATED BASED ON THE NET
    ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
 
    DIVIDENDS AND DISTRIBUTIONS ARE ASSUMED TO BE REINVESTED AT THE PRICES
    OBTAINED UNDER THE TRUST'S DIVIDEND REINVESTMENT PLAN.
 
(1) NOT ANNUALIZED.
 
(2) ANNUALIZED.
 
4
<PAGE>
                               PROSPECTUS SUMMARY
 
    THE FOLLOWING INFORMATION IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE
MORE DETAILED INFORMATION INCLUDED ELSEWHERE IN THIS PROSPECTUS.
 
<TABLE>
<S>                       <C>
THE TRUST...............  Morgan Stanley Dean Witter Prime Income Trust (the "Trust") is a
                          non-diversified, closed- end management investment company, organized as a
                          Massachusetts business trust. The Trust commenced operations on November 30,
                          1989 (under the name "Allstate Prime Income Trust") following completion of a
                          firm commitment initial underwriting for 10,921,751 Shares, with net proceeds
                          to the Trust of $109,217,510. The Trust commenced the continuous offering of
                          its shares on December 4, 1989. See "The Trust and its Advisor."
PURCHASE OF SHARES......  The Trust is offering continuously its shares of beneficial interest, par
                          value $.01 (the "Shares"), through Morgan Stanley Dean Witter Distributors
                          Inc. (the "Distributor"), as principal underwriter of the Shares, through
                          certain dealers, including Dean Witter Reynolds Inc. ("DWR"), a broker-dealer
                          affiliate of the Trust's Investment Advisor and Administrator, which have
                          entered into selected dealer agreements with the Distributor, at a price per
                          Share equal to the then current net asset value per Share. The minimum
                          investment in the Trust is $1,000 for initial investments and $100 for
                          subsequent investments. See "Purchase of Shares."
INVESTMENT OBJECTIVE AND
POLICIES................  The investment objective of the Trust is to provide a high level of current
                          income consistent with the preservation of capital. The Trust seeks to achieve
                          its objective through investment primarily in interests in senior
                          collateralized loans ("Senior Loans") to corporations, partnerships and other
                          entities ("Borrowers"). Senior Loans may take the form of syndicated loans
                          ("Syndicated Loans") or of debt obligations of Borrowers issued directly to
                          investors in the form of debt securities ("Senior Notes"). Senior Loans in
                          which the Trust will invest generally pay interest at rates which float or are
                          reset at a margin above a generally recognized base lending rate. These base
                          lending rates are generally the prime rate quoted by a major U.S. bank ("Prime
                          Rate"), the London Inter-Bank Offered Rate ("LIBOR"), the Certificate of
                          Deposit ("CD") rate or other base lending rates used by commercial lenders.
                          Under normal market conditions, the Trust will invest at least 80% of its
                          total assets in Senior Loans. The remainder of its assets will be invested in
                          cash or in short-term, high quality money market instruments. There is no
                          restriction or percentage limitation with respect to the Trust's investment in
                          illiquid securities. While the Trust is not subject to any restrictions with
                          respect to the maturity of Senior Loans held in its portfolio, it is currently
                          anticipated that at least 80% of the Trust's total assets invested in Senior
                          Loans will consist of Senior Loans with stated maturities of between three and
                          ten years. As a result of prepayments and amortization, however, the actual
                          maturities of the Syndicated Loans in the Trust's portfolio are expected to
                          range between three and four years and the Senior Notes are expected to have
                          average maturities of approximately six to seven years. The Senior Loans in
                          the Trust's portfolio will at all times have a dollar-weighted average time
                          until the next interest rate determination of 90 days or less.
                          The Investment Advisor will perform its own credit analyses of Borrowers and
                          will consider, and may rely in part on, analyses performed by lenders other
                          than the Trust. The Trust will invest only in Senior Loans where the
                          Investment Advisor believes that the Borrower can meet debt service
                          requirements in a timely manner and where the market value of the collateral
                          at the time of investment equals or exceeds the amount of the Senior Loan.
                          Among other factors, the Investment Advisor will also consider the operating
                          history, competitive position and management of the Borrower; the business
                          outlook of the Borrower's industry and the terms of the loan agreement with
                          the Borrower. The Investment Advisor will monitor the qualifications of
                          Borrowers on an ongoing basis. Senior Loans presently are not rated by
                          nationally recognized statistical rating organizations. Since the minimum debt
                          rating of a Borrower may not have a meaningful relation to the quality of such
                          Borrower's senior collateralized debt, the Trust does not impose any minimum
                          standard regarding the rating of other debt instruments of the Borrower.
                          Senior Loans are typically structured by a syndicate of lenders ("Lenders"),
                          one or more of which administers the Senior Loan on behalf of the Lenders
                          ("Agent"). Lenders may sell interests in Senior Loans to third parties
                          ("Participations") or may assign all or a portion of
</TABLE>
 
                                                                               5
<PAGE>
 
<TABLE>
<S>                       <C>
                          their interest in a Senior Loan to third parties ("Assignments"). The Trust
                          may invest in Senior Loans in the following ways: it may purchase
                          Participations, it may purchase Assignments of a portion of a Senior Loan or
                          it may act as one of the group of Lenders originating a Senior Loan or obtain
                          from such a Lender (through a novation) all of the rights of such Lender in a
                          Senior Loan, including the ability to enforce such rights directly against the
                          Borrower. When the Trust is a Lender, or obtains through a novation all of the
                          rights of a Lender, it will, as a party to the loan agreement with the
                          Borrower ("Loan Agreement"), have a direct contractual relationship with the
                          Borrower and may enforce directly compliance by the Borrower with the terms of
                          the Loan Agreement. When the Trust purchases a Participation, the Trust
                          typically enters into a contractual relationship with the Lender or third
                          party selling such Participation ("Selling Participant"), but not with the
                          Borrower. As a result, the Trust assumes the credit risk of the Borrower, the
                          Selling Participant and any other persons interpositioned between the Trust
                          and the Borrower ("Intermediate Participants") and the Trust may not directly
                          benefit from the collateral supporting the Senior Loan in which it has
                          purchased the Participation. The Trust will only acquire Participations if the
                          Selling Participant, and each Intermediate Participant, is a financial
                          institution which meets certain minimum creditworthiness standards. See
                          "Investment Objective and Policies." When the Trust purchases an Assignment,
                          it will acquire all or a portion of the rights of the Lender or other third
                          party whose interest is being assigned, but may not be a party to the Loan
                          Agreement and may be required to rely on such Lender or other third party to
                          demand payment and enforce its rights against the Borrower. Assignments are
                          arranged through private negotiations between potential assignors and
                          potential assignees; consequently, the rights and obligations acquired by the
                          purchaser of an Assignment may differ from and be more limited than those held
                          by the assignor. The Trust may pay a fee or forgo a portion of interest
                          payments when acquiring Participations and Assignments. See "Investment
                          Objective and Policies."
INVESTMENT ADVISOR......  Morgan Stanley Dean Witter Advisors Inc. ("MSDW Advisors" or the "Investment
                          Advisor"), whose address is Two World Trade Center, New York, New York 10048,
                          is the Trust's Investment Advisor. The Investment Advisor is a wholly-owned
                          subsidiary of Morgan Stanley Dean Witter & Co., a preeminent global financial
                          services firm that maintains leading market positions in each of its three
                          primary businesses--securities, asset management and credit services. The
                          Investment Advisor, which was incorporated in July, 1992 under the name Dean
                          Witter Intercapital Inc., changed its name to Morgan Stanley Dean Witter
                          Advisors Inc. on June 22, 1998.
                          The Investment Advisor and its wholly-owned subsidiary, Morgan Stanley Dean
                          Witter Services Company Inc., serve in various investment management,
                          advisory, management, and administrative capacities to 101 investment
                          companies, 28 of which are listed on the New York Stock Exchange, with
                          combined assets of approximately $110.8 billion as of June 30, 1998. The
                          Investment Advisor also manages and advises portfolios of pension plans, other
                          institutions and individuals which aggregated approximately $4.4 billion at
                          such date. The Trust's Trustees approved a new investment advisory agreement
                          with MSDW Advisors, on February 21, 1997 in connection with the merger of Dean
                          Witter, Discover & Co. with Morgan Stanley Group Inc. (the "Merger"). At a
                          Special Meeting of Shareholders held on May 20, 1997, the shareholders
                          approved the new investment advisory agreement with MSDW Advisors. The
                          investment advisory agreement took effect on May 31, 1997 upon the consumation
                          of the Merger. See "The Trust and its Advisor" and "Investment Advisory
                          Agreement."
ADVISORY FEE............  The investment advisory fees paid to MSDW Advisors pursuant to the investment
                          advisory agreement is calculated at an annual rate of 0.90% of average daily
                          net assets on assets of the Trust up to $500 million, at an annual rate of
                          0.85% of average daily net assets on assets of the Trust exceeding $500
                          million up to $1.5 billion and at an annual rate of 0.825% of the average
                          daily net assets of the Trust exceeding $1.5 billion. The advisory fee is
                          higher than that paid by most other investment companies. See "Investment
                          Advisory Agreement."
ADMINISTRATOR...........  Morgan Stanley Dean Witter Services Company Inc. (the "Administrator" or "MSDW
                          Services"), a wholly-owned subsidiary of MSDW Advisors, the Investment Advisor
                          of the Trust, is the Administrator of the Trust. See "Administrator and
                          Administration Agreement" and "Purchase of Shares."
</TABLE>
 
6
<PAGE>
 
<TABLE>
<S>                       <C>
ADMINISTRATION FEE......  The Trust pays the Administrator a monthly fee at an annual rate of 0.25% of
                          the Trust's daily net assets. See "Administrator and Administration
                          Agreement."
DIVIDENDS AND
DISTRIBUTIONS...........  Income dividends are declared daily and paid monthly. Dividends and
                          distributions to holders of Shares cannot be assured, and the amount of each
                          monthly payment may vary. Capital gains, if any, will be distributed at least
                          annually. All dividends and capital gains distributions will be reinvested
                          automatically in additional Shares, unless the shareholder elects to receive
                          cash distributions. See "Dividends and Distributions" and "Taxation."
SHARE REPURCHASES AND
TENDERS.................  The Board of Trustees of the Trust currently intends, each quarter, to
                          consider authorizing the Trust to make tender offers for all or a portion of
                          its outstanding Shares at the then current net asset value of the Shares. An
                          early withdrawal charge payable to the Investment Advisor of up to 3.0% of the
                          original purchase price of such Shares will be imposed on most Shares accepted
                          for tender that have been held for four years or less. There can be no
                          assurance that the Trust will in fact tender for any of its Shares. If a
                          tender offer is not made or Shares are not purchased pursuant to a tender
                          offer, Shareholders may not be able to sell their Shares. If the Trust tenders
                          for Shares, there is no guarantee that all or any Shares tendered will be
                          purchased. Subject to its borrowing restrictions, the Trust may incur debt to
                          finance repurchases of its Shares pursuant to tender offers, which borrowings
                          entail additional risks. The ability of the Trust to tender for its Shares may
                          be limited by certain requirements of the Internal Revenue Code of 1986 that
                          must be satisfied in order for the Trust to maintain its desired tax status as
                          a regulated investment company. See "The Trust and its Advisor," "Purchase of
                          Shares" and "Share Repurchases and Tenders."
CUSTODIAN...............  The Bank of New York serves as Custodian of the Trust's assets. See
                          "Custodian, Dividend Disbursing and Transfer Agent."
SPECIAL CONSIDERATIONS
AND RISK FACTORS........  There is not expected to be any secondary trading market in the Shares and an
                          investment in the Shares should be considered illiquid. Moreover, the
                          Distributor and other dealers who enter into dealer agreements with the
                          Distributor are prohibited under applicable law from making a market in the
                          Shares while the Trust is continuously offering its Shares or engaged in a
                          tender offer for its Shares. To the extent that a secondary market does
                          develop, however, investors should be aware that the shares of closed-end
                          funds frequently trade in the secondary market at a discount from their net
                          asset values. Should there be a secondary market for the Shares, it is
                          expected that the Shares will not trade at a premium because the Trust intends
                          to engage in a continuous offering at net asset value.
                          Due to the lack of a secondary market for the Shares and the early withdrawal
                          charge, the Trust should be viewed as a long-term investment and not as a
                          vehicle for short-term trading.
                          Since the Trust invests primarily in floating and variable rate obligations,
                          the Trust's yield is likely to vary in accordance with changes in prevailing
                          short-term interest rates. This policy should also result in a net asset value
                          which fluctuates less than would a portfolio consisting primarily of fixed
                          rate obligations; however, the Trust's net asset value may vary to the extent
                          that changes in prevailing interest rates are not immediately reflected in the
                          interest rates payable on Senior Loans in the Trust's portfolio, particularly
                          if there were a sudden and extreme change in interest rates. Also, to the
                          extent Senior Loans in the Trust's portfolio are valued based on recent
                          pricings for similar Senior Loans, net asset value may fluctuate due to
                          changes in pricing parameters for newly issued Senior Loans (e.g., interest
                          rates are set at a higher or lower margin above the base lending rate than
                          were Senior Loans in the Trust's portfolio).
                          In addition to fluctuations in net asset value which may be caused by
                          variations in prevailing interest rates and Senior Loan pricing parameters,
                          the Trust's net asset value would be adversely affected in the event of a
                          default on a Senior Loan and could be affected by a substantial deterioration
                          in the creditworthiness of Borrowers or Selling Participants or Intermediate
                          Participants or a decline in value of the collateral securing the Senior Loan.
                          Also, if any such Borrower or Selling Participant or Intermediate Participant
                          fails to meet in a timely manner its obligations to remit principal and
                          interest payments to the Trust, the Trust is likely to experience a decline in
                          its net asset value.
</TABLE>
 
                                                                               7
<PAGE>
 
<TABLE>
<S>                       <C>
                          Although the Trust will generally have access to financial and other
                          information made available to the Lenders in connection with Senior Loans, the
                          amount of public information available with respect to Senior Loans generally
                          will be less extensive than that available for rated, registered and exchange
                          listed securities. As a result, the performance of the Trust and its ability
                          to meet its investment objective is more dependent on the analytical abilities
                          of the Investment Advisor than would be the case for an investment company
                          that invests primarily in rated, registered or exchange-listed securities.
                          The Loan Agreement with the Borrower, which establishes the relative terms and
                          conditions of the Senior Loan and rights of the Borrower and the Lenders, will
                          typically vest the Agent with broad discretion in enforcing and administering
                          the Agreement. Accordingly, the success of the Trust will depend in part on
                          the skill with which the Agent administers the terms of the Loan Agreement,
                          monitors Borrower compliance with covenants, collects principal, interest and
                          fee payments from Borrowers and, where necessary, enforces creditor's remedies
                          against Borrowers. See "Investment Objective and Policies."
                          Interests in Senior Loans are not listed on any national securities exchange
                          or automated quotation system and no regular market has developed in which
                          interests in Senior Loans are traded. The substantial portion of the Trust's
                          assets invested in relatively illiquid Senior Loan interests may restrict the
                          ability of the Trust to dispose of its investments in Senior Loans in a timely
                          fashion and at a fair price, and could result in capital losses to the Trust
                          and holders of Shares. To the extent that the Trust's investments are
                          illiquid, the Trust may have difficulty disposing of portfolio securities in
                          order to purchase its Shares pursuant to tender offers, if any. The Board of
                          Trustees of the Trust will consider the liquidity of the Trust's portfolio
                          securities in determining whether a tender offer should be made by the Trust
                          and the number of Shares to be tendered.
                          The Trust may invest in Senior Loans which are made to non-U.S. Borrowers
                          provided that the Senior Loans are dollar-denominated and any such Borrower
                          meets the credit standards established by the Investment Advisor for U.S.
                          Borrowers. Loans to non-U.S. Borrowers may involve risks not typically
                          involved in loans to U.S. Borrowers.
                          The Trust's Declaration of Trust includes anti-takeover provisions, including
                          the requirement for a 66% shareholder vote to remove Trustees and for certain
                          mergers, issuances of Shares and asset acquisitions that could have the effect
                          of limiting the ability of other persons or entities to acquire control of the
                          Trust and could have the effect of depriving holders of Shares of an
                          opportunity to sell their Shares at a premium above prevailing market prices
                          by discouraging a third party from seeking to obtain control of the Trust. See
                          "Description of Shares--Anti-Takeover Provisions."
                          The Trust may be deemed to be concentrated in securities of issuers in the
                          industry group consisting of financial institutions and their holding
                          companies, including commercial banks, thrift institutions, insurance
                          companies and finance companies. As a result, the Trust is subject to certain
                          risks associated with such institutions, including, among other things,
                          changes in governmental regulation, interest rate levels and general economic
                          conditions. See "Investment Objective and Policies" and "Investment
                          Restrictions."
                          The Trust has registered as a "non-diversified" investment company so that it
                          will be able to invest more than 5% of the value of its total assets in the
                          obligations of any single issuer, including Senior Loans of a single Borrower
                          or Participations purchased from a single Lender. The Trust does not intend to
                          invest, however, more than 10% of the value of its total assets in interests
                          in Senior Loans of a single Borrower. To the extent the Trust invests its
                          assets in obligations of a more limited number of issuers than a diversified
                          investment company, the Trust will be more susceptible than a diversified
                          investment company to any single corporate, economic, political or regulatory
                          occurrence. See "Investment Objective and Policies."
</TABLE>
 
8
<PAGE>
THE TRUST AND ITS ADVISOR
- --------------------------------------------------------------------------------
 
Morgan Stanley Dean Witter Prime Income Trust (the "Trust") (formerly named
Prime Income Trust) is a non-diversified, closed-end management investment
company whose investment objective is to provide a high level of current income
consistent with the preservation of capital. The Trust will seek to achieve its
objective through investment primarily in senior collateralized loans ("Senior
Loans") to corporations, partnerships and other entities ("Borrowers"). No
assurance can be given that the Trust will achieve its investment objective. The
Trust is designed primarily for long-term investment and not as a trading
vehicle.
 
    The Trust is a trust of a type commonly known as a "Massachusetts business
trust" and was organized under the laws of Massachusetts on August 17, 1989
under the name "Allstate Prime Income Trust." Effective March 1, 1993, the Trust
Agreement was amended to change the name of the Trust to "Prime Income Trust."
Such amendment was made upon the approval by the shareholders of an investment
advisory agreement with MSDW Advisors. On June 22, 1998, the Trustees of the
Trust adopted an Amendment to the Trust's Declaration of Trust changing its name
to "Morgan Stanley Dean Witter Prime Income Trust." The Trust commenced
operations on November 30, 1989, following completion of a firm commitment
initial underwriting for 10,921,751 Shares, with net proceeds to the Trust of
$109,217,510. The Trust commenced the continuous offering of its shares on
December 4, 1989. The Trust's principal office is located at Two World Trade
Center, New York, New York 10048 and its telephone number is (212) 392-1600. The
Trust is offering continuously its shares of beneficial interest, $.01 par value
(the "Shares"). See "Purchase of Shares."
 
    An investment in Shares offers several benefits. The Trust offers investors
the opportunity to receive a high level of current income by investing in a
professionally managed portfolio comprised primarily of Senior Loans, a type of
investment typically not available to individual investors. In managing such a
portfolio, the Investment Advisor provides the Trust and its shareholders with
professional credit analysis and portfolio diversification. The Trust also
relieves the investor of burdensome administrative details involved in managing
a portfolio of Senior Loans, even if they were available to individual
investors. Such benefits are at least partially offset by the expenses involved
in operating an investment company, which consist primarily of management and
administrative fees and operational costs. See "Investment Advisory Agreement"
and "Administrator and Administration Agreement."
 
    On February 21, 1997 the Trust's Trustees approved a new investment advisory
agreement (the "Advisory Agreement") with MSDW Advisors in connection with the
merger of Dean Witter, Discover & Co. with Morgan Stanley Group Inc. (the
"Merger"). The Trust's shareholders voted to approve the Advisory Agreement with
MSDW Advisors at a Special Meeting of Shareholders held on May 20, 1997. The
Advisory Agreement took effect on May 31, 1997 upon the consumation of the
Merger. MSDW Advisors is a wholly-owned subsidiary of Morgan Stanley Dean Witter
& Co. ("MSDW"). The Advisory Agreement is substantially identical to a prior
investment advisory agreement which was initially approved by the Trust's
Trustees on December 23, 1992 and by the Trust's shareholders on February 25,
1993, entered into with MSDW Advisors as a consequence of the withdrawal of
Allstate Investment Management Company ("AIMCO") from its investment company
advisory activities and its concomitant resignation as the Trust's Investment
Advisor.
 
    MSDW Advisors and its wholly-owned subsidiary, Morgan Stanley Dean Witter
Services Company Inc., serve in various investment management, advisory,
management and administrative capacities to 101 investment companies, 28 of
which are listed on the New York Stock Exchange, with combined assets of
approximately $110.8 billion at June 30, 1998. MSDW Advisors also manages and
advises portfolios of pension plans, other institutions and individuals which
aggregated approximately $4.4 billion at such date.
 
    The Trust is managed within MSDW Advisors' Taxable Fixed-Income Group, which
manages 23 funds and fund portfolios with approximately $13.8 billion in assets
as of June 30, 1998. Rajesh K. Gupta, Senior Vice President of MSDW Advisors,
Sheila A. Finnerty, Vice President of MSDW Advisors, and Peter Gewirtz, an
Assistant Vice President of MSDW Advisors, have been the primary portfolio
managers primarily responsible for the management of the Trust's portfolio since
February, 1998.
 
    MSDW Advisors is the investment manager or investment advisor of the
following investment companies, which are collectively referred to as the
"Morgan Stanley Dean Witter Funds":
 
<TABLE>
<CAPTION>
OPEN-END FUNDS
 
<C>        <S>
        1  Active Assets California Tax-Free Trust
        2  Active Assets Government Securities Trust
        3  Active Assets Money Trust
        4  Active Assets Tax-Free Trust
        5  Morgan Stanley Dean Witter American Value Fund
        6  Morgan Stanley Dean Witter Balanced Growth Fund
        7  Morgan Stanley Dean Witter Balanced Income Fund
        8  Morgan Stanley Dean Witter California Tax-Free Daily Income Trust
</TABLE>
 
                                                                               9
<PAGE>
<TABLE>
<C>        <S>
        9  Morgan Stanley Dean Witter California Tax-Free Income Fund
       10  Morgan Stanley Dean Witter Capital Appreciation Fund
       11  Morgan Stanley Dean Witter Capital Growth Securities
       12  Morgan Stanley Dean Witter Competitive Edge Fund, "BEST IDEAS" Portfolio
       13  Morgan Stanley Dean Witter Convertible Securities Trust
       14  Morgan Stanley Dean Witter Developing Growth Securities Trust
       15  Morgan Stanley Dean Witter Diversified Income Trust
       16  Morgan Stanley Dean Witter Dividend Growth Securities Inc.
       17  Morgan Stanley Dean Witter Equity Fund
       18  Morgan Stanley Dean Witter European Growth Fund Inc.
       19  Morgan Stanley Dean Witter Federal Securities Trust
       20  Morgan Stanley Dean Witter Financial Services Trust
       21  Morgan Stanley Dean Witter Fund of Funds
       22  Dean Witter Global Asset Allocation Fund
       23  Morgan Stanley Dean Witter Global Dividend Growth Securities
       24  Morgan Stanley Dean Witter Global Short-Term Income Fund Inc.
       25  Morgan Stanley Dean Witter Global Utilities Fund
       26  Morgan Stanley Dean Witter Growth Fund
       27  Morgan Stanley Dean Witter Hawaii Municipal Trust
       28  Morgan Stanley Dean Witter Health Sciences Trust
       29  Morgan Stanley Dean Witter High Yield Securities Inc.
       30  Morgan Stanley Dean Witter Income Builder Fund
       31  Morgan Stanley Dean Witter Information Fund
       32  Morgan Stanley Dean Witter Intermediate Income Securities
       33  Morgan Stanley Dean Witter Intermediate Term U.S. Treasury Trust
       34  Morgan Stanley Dean Witter International SmallCap Fund
       35  Morgan Stanley Dean Witter Japan Fund
       36  Morgan Stanley Dean Witter Limited Term Municipal Trust
       37  Morgan Stanley Dean Witter Liquid Asset Fund Inc.
       38  Morgan Stanley Dean Witter Market Leader Trust
       39  Morgan Stanley Dean Witter Mid-Cap Dividend Growth Securities
       40  Morgan Stanley Dean Witter Mid-Cap Growth Fund
       41  Morgan Stanley Dean Witter Multi-State Municipal Series Trust
       42  Morgan Stanley Dean Witter Natural Resource Development Securities Inc.
       43  Morgan Stanley Dean Witter New York Municipal Money Market Trust
       44  Morgan Stanley Dean Witter New York Tax-Free Income Fund
       45  Morgan Stanley Dean Witter Pacific Growth Fund Inc.
       46  Morgan Stanley Dean Witter Precious Metals and Minerals Trust
       47  Dean Witter Retirement Series
       48  Morgan Stanley Dean Witter Select Dimensions Investment Series
       49  Morgan Stanley Dean Witter Select Municipal Reinvestment Fund
       50  Morgan Stanley Dean Witter Short-Term Bond Fund
       51  Morgan Stanley Dean Witter Short-Term U.S. Treasury Trust
       52  Morgan Stanley Dean Witter Special Value Fund
       53  Morgan Stanley Dean Witter S&P 500 Index Fund
       54  Morgan Stanley Dean Witter Strategist Fund
       55  Morgan Stanley Dean Witter Tax-Exempt Securities Trust
       56  Morgan Stanley Dean Witter Tax-Free Daily Income Trust
       57  Morgan Stanley Dean Witter U.S. Government Money Market Trust
       58  Morgan Stanley Dean Witter U.S. Government Securities Trust
       59  Morgan Stanley Dean Witter Utilities Fund
       60  Morgan Stanley Dean Witter Value-Added Market Series
       61  Morgan Stanley Dean Witter Variable Investment Series
       62  Morgan Stanley Dean Witter World Wide Income Trust
<CAPTION>
 
CLOSED-END FUNDS
<C>        <S>
 
        1  InterCapital California Insured Municipal Income Trust
        2  InterCapital California Quality Municipal Securities
        3  Dean Witter Government Income Trust
        4  High Income Advantage Trust
        5  High Income Advantage Trust II
        6  High Income Advantage Trust III
        7  InterCapital Income Securities Inc.
        8  InterCapital Insured California Municipal Securities
</TABLE>
 
10
<PAGE>
<TABLE>
<C>        <S>
        9  InterCapital Insured Municipal Bond Trust
       10  InterCapital Insured Municipal Income Trust
       11  InterCapital Insured Municipal Securities
       12  InterCapital Insured Municipal Trust
       13  Municipal Income Opportunities Trust
       14  Municipal Income Opportunities Trust II
       15  Municipal Income Opportunities Trust III
       16  Municipal Income Trust
       17  Municipal Income Trust II
       18  Municipal Income Trust III
       19  Municipal Premium Income Trust
       20  InterCapital New York Quality Municipal Securities
       21  Morgan Stanley Dean Witter Prime Income Trust
       22  InterCapital Quality Municipal Income Trust
       23  InterCapital Quality Municipal Investment Trust
       24  InterCapital Quality Municipal Securities
</TABLE>
 
    In addition, Morgan Stanley Dean Witter Services Company Inc. ("MSDW
Services"), a wholly-owned subsidiary of MSDW Advisors, serves as manager for
the following investment companies for which TCW Funds Management, Inc. is the
investment advisor (the "TCW/DW Funds"):
<TABLE>
<CAPTION>
OPEN-END FUNDS
 
<C>        <S>
        1  TCW/DW Emerging Markets Opportunities Trust
        2  TCW/DW Global Telecom Trust
        3  TCW/DW Income and Growth Fund
        4  TCW/DW Latin American Growth Fund
        5  TCW/DW Mid-Cap Equity Trust
        6  TCW/DW North American Government Income Trust
        7  TCW/DW Small Cap Growth Fund
        8  TCW/DW Total Return Trust
 
<CAPTION>
 
CLOSED-END FUNDS
<C>        <S>
 
        1  TCW/DW Term Trust 2000
        2  TCW/DW Term Trust 2002
        3  TCW/DW Term Trust 2003
</TABLE>
 
    MSDW Advisors also serves as: (i) administrator of The BlackRock Strategic
Term Trust Inc., a closed-end investment company; (ii) sub-administrator of
Templeton Global Governments Income Trust, a closed-end investment company; and
(iii) investment advisor of Offshore Dividend Growth Fund and Offshore Money
Market Fund, mutual funds established under the laws of the Cayman Islands and
available only to investors who are participants in International Active Assets
Account program and are neither citizens nor residents of the United States.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
The Trust's investment objective is to provide a high level of current income
consistent with the preservation of capital. The Trust will seek to achieve its
objective through investment primarily in Senior Loans. Senior Loans in which
the Trust will invest generally pay interest at rates which float or are reset
at a margin above a generally recognized base lending rate. These base lending
rates are the Prime Rate, LIBOR, the CD rate or other base lending rates used by
commercial lenders. The Prime Rate quoted by a major U.S. bank is the interest
rate at which such bank is willing to lend U.S. dollars to creditworthy
borrowers. LIBOR is an average of the interest rates quoted by several
designated banks as the rates at which such banks would offer to pay interest to
major financial institutional depositors in the London interbank market on U.S.
dollar-denominated deposits for a specified period of time. The CD rate is the
average rate paid on large certificates of deposit traded in the secondary
market. The Investment Advisor believes that over time the Trust's effective
yield will exceed money market rates and will track the movements in the
published Prime Rate of major U.S. banks, although it may not equal the Prime
Rate. An investment in the Trust may not be appropriate for all investors and is
not intended to be a complete investment program. No assurance can be given that
the Trust will achieve its investment objective.
 
    Under normal market conditions, the Trust will invest at least 80% of its
total assets in Senior Loans. The Trust currently intends to limit its
investments in Senior Notes to no more than 20% of its total assets. The
remainder of the Trust's assets may be invested in cash or in high quality debt
securities with remaining maturities of one year or less, although it is
anticipated that the debt securities in which the Trust invests will have
remaining maturities of 60 days or less. Such securities may include commercial
paper rated at least in the top two rating categories of either Standard &
Poor's
 
                                                                              11
<PAGE>
Corporation or Moody's Investors Service, Inc., or unrated commercial paper
considered by the Investment Advisor to be of similar quality, certificates of
deposit and bankers' acceptances and securities issued or guaranteed by the U.S.
government, its agencies or instrumentalities. Such securities may pay interest
at rates which are periodically redetermined or may pay interest at fixed rates.
High quality debt securities and cash may comprise up to 100% of the Trust's
total assets during temporary defensive periods when, in the opinion of the
Investment Advisor, suitable Senior Loans are not available for investment by
the Trust or prevailing market or economic conditions warrant.
 
    The Trust is not subject to any restrictions with respect to the maturity of
Senior Loans held in its portfolio. It is currently anticipated that at least
80% of the Trust's total assets invested in Senior Loans will consist of Senior
Loans with stated maturities of between three and ten years, inclusive, and with
rates of interest which are redetermined either daily, monthly or quarterly. As
a result of prepayments and amortization, however, it is expected that the
actual maturities of Syndicated Loans will be approximately three to four years
and of Senior Notes approximately six to seven years. The Senior Loans in the
Trust's portfolio will at all times have a dollar-weighted average time until
the next interest rate redetermination of 90 days or less.
 
    The value of fixed income obligations generally varies in response to
changes in interest rates. When interest rates decline, the value of a fixed
income obligation can be expected to rise; conversely, the value of the
obligation can be expected to decrease when interest rates rise. Accordingly,
the net asset value of an investment company which invests a substantial portion
of its total assets in fixed income securities can be expected to fluctuate
significantly with changes in interest rates. The Investment Advisor expects the
Trust's net asset value to be relatively stable during normal market conditions,
because the Trust's portfolio will consist primarily of Senior Loans on which
the interest rate is periodically adjusted in response to interest rate changes
on short-term investments. However, because the interest rate on a Senior Loan
may be reset only periodically, the Trust's net asset value may fluctuate from
time to time in the event of an imperfect correlation between the interest rates
on Senior Loans in the Trust's portfolio and prevailing short-term interest
rates. This would be particularly likely to occur in the event of a sudden and
extreme movement in interest rates. Also, to the extent that Senior Loans in the
Trust's portfolio are valued based on recent pricings for similar Senior Loans,
net asset value may fluctuate due to changes in pricing parameters for newly
issued Senior Loans (e.g., interest rates are set at a higher or lower margin
above the base lending rate than were Senior Loans in the Trust's portfolio). A
decline in the Trust's net asset value would also result from a default on a
Senior Loan in which the Trust has invested and could result from a substantial
deterioration in the creditworthiness of a Borrower or in the value of
collateral securing a Senior Loan. Also, if any Borrower or any Selling
Participant or Intermediate Participant fails to meet in a timely manner its
obligations to remit principal and interest payments to the Trust, the Trust is
likely to experience a decline in its net asset value.
 
    The Senior Loans in which the Trust will invest will consist primarily of
direct obligations of a Borrower undertaken to finance the growth of the
Borrower's business or to finance a capital restructuring. Such loans may
include "leveraged buy-out" loans which are made to a Borrower for the purpose
of acquiring ownership control of another company, whether as a purchase of
equity or of assets or for a leveraged reorganization of the Borrower with no
change in ownership. The Trust may invest in Senior Loans which are made to
non-U.S. Borrowers, provided that the loans are dollar-denominated and any such
Borrower meets the credit standards established by the Investment Advisor for
U.S. Borrowers. Loans by non-U.S. Borrowers involve risks not typically involved
in domestic investment, including future foreign political and economic
developments and the possible imposition of exchange controls or other foreign
or U.S. governmental laws or restrictions applicable to such loans. In addition,
although loans to non-U.S. Borrowers will be dollar-denominated debt
obligations, such loans involve foreign currency exchange risks to the extent
that a decline in a non-U.S. Borrower's own currency relative to the dollar may
impair such Borrower's ability to meet debt service on a Senior Loan.
 
    Senior Loans hold the most senior position in a Borrower's capital
structure, although some Senior Loans may hold an equal ranking with other
senior securities of the Borrower (i.e., have equal claims to the Borrower's
assets). In order to borrow money pursuant to Senior Loans, a Borrower will
frequently pledge as collateral its assets, including, but not limited to,
trademarks, accounts receivable, inventory, buildings, real estate, franchises
and common and preferred stock in its subsidiaries. In addition, in the case of
some Senior Loans, there may be additional collateral pledged in the form of
guarantees by and/or securities of affiliates of the Borrowers. A Loan Agreement
may also require the Borrower to pledge additional collateral in the event that
the value of the collateral falls. In certain instances, a Senior Loan may be
secured only by stock in the Borrower or its subsidiaries. Each Senior Loan in
which the Trust will invest will be secured by collateral which the Investment
Advisor believes to have a market value, at the time of acquisition of the
Senior Loan, which equals or exceeds the principal amount of the Senior Loan.
The value of such collateral generally will be determined by an independent
appraisal and/or other information regarding the collateral furnished by the
Agent. Such information will generally include appraisals in the case of assets
such as real estate, buildings and equipment, audits in the case of inventory
and analyses (based upon, among other things, investment bankers' opinions,
fairness opinions and relevant transactions in the marketplace) in the case of
other kinds of collateral. Loan Agreements may also include various restrictive
covenants designed to limit the activities of the Borrower in an effort to
protect the right of the Lenders to receive timely payments of interest on and
repayment of principal of the Senior Loans. Restrictive covenants contained in a
Loan Agreement may include mandatory
 
12
<PAGE>
prepayment provisions arising from excess cash flow and typically include
restrictions on dividend payments, specific mandatory minimum financial ratios,
limits on total debt and other financial tests. Breach of such covenants, if not
waived by the Lenders, is generally an event of default under the applicable
Loan Agreement and may give the Lenders the right to accelerate principal and
interest payments.
 
    The Investment Advisor will perform its own credit analysis of the Borrower
and will consider, and may rely in part on, the analyses performed by Lenders
other than the Trust. The Trust will invest only in those Senior Loans with
respect to which the Borrower, in the opinion of the Investment Advisor,
demonstrates the ability to meet debt service in a timely manner (taking into
consideration the Borrower's capital structure, liquidity and historical and
projected cash flow) and where the Investment Advisor believes that the market
value of the collateral at the time of investment equals or exceeds the amount
of the Senior Loan. The Investment Advisor will also consider the following
characteristics: the operating history, competitive position and management of
the Borrower; the business outlook of the Borrower's industry; the terms of the
Loan Agreement (e.g., the nature of the covenants, interest rate and fees and
prepayment conditions); whether the Trust will purchase an Assignment,
Participation or act as a lender originating a Senior Loan; and the
creditworthiness of and quality of service provided by the Agent and any Selling
Participant or Intermediate Participants. Senior Loans presently are not rated
by nationally recognized statistical rating organizations. Because of the
collateralized nature and other credit enhancement features of Senior Loans,
such as third-party guarantees, as well as the fact that a Borrower's other debt
obligations are often subordinated to its Senior Loans, the Trust and the
Investment Advisor believe that ratings of other securities issued by a Borrower
do not necessarily reflect adequately the relative quality of a Borrower's
Senior Loans. Therefore, although the Investment Advisor may consider such
ratings in determining whether to invest in a particular Senior Loan, the
Investment Advisor is not required to consider such ratings and such ratings
will not be the determinative factor in its analysis.
 
    Senior Loans typically are arranged through private negotiations between a
Borrower and several financial institutions ("Lenders") represented in each case
by one or more of such Lenders acting as agent ("Agent") of the several Lenders.
On behalf of the several Lenders, the Agent, which is frequently the commercial
bank that originates the Senior Loan and the person that invites other parties
to join the lending syndicate, typically will be primarily responsible for
negotiating the loan agreement or agreements ("Loan Agreement") that establish
the relative terms, conditions and rights of the Borrower and the several
Lenders. In larger transactions it is common to have several Agents; however,
generally only one such Agent has primary responsibility for documentation and
administration of the Senior Loan. Agents are typically paid a fee or fees by
the Borrower for their services.
 
    The Trust may invest in Senior Loans in the following ways: (i) it may
purchase Participations, (ii) it may purchase Assignments of a portion of a
Senior Loan, (iii) it may act as one of the group of Lenders originating a
Senior Loan or (iv) it may assume through a novation all of the rights of a
Lender in a Senior Loan, including the right to enforce its rights as a Lender
directly against the Borrower.
 
    When the Trust is a Lender, or assumes all of the rights of a Lender through
an assignment or a novation, it will, as a party to the Loan Agreement, have a
direct contractual relationship with the Borrower and may enforce compliance by
the Borrower with the terms of the Loan Agreement. Lenders also have voting and
consent rights under the applicable Loan Agreement. Action subject to Lender
vote or consent generally requires the vote or consent of the holders of some
specified percentage of the outstanding principal amount of the Senior Loan,
which percentage varies depending on the relevant Loan Agreement. Certain
decisions, such as reducing the amount or increasing the time for payment of
interest on or repayment of principal of a Senior Loan, or releasing collateral
therefor, frequently require the unanimous vote or consent of all Lenders
affected.
 
    A Participation may be acquired from an Agent, a Lender or any other holder
of a Participation ("Selling Participant"). Investment by the Trust in a
Participation typically will result in the Trust having a contractual
relationship only with the Selling Participant, not with the Borrower or any
other entities interpositioned between the Trust and the Borrower ("Intermediate
Participants"). The Trust will have the right to receive payments of principal,
interest and any fees to which it is entitled only from the Selling Participant
and only upon receipt by such Selling Participant of such payments from the
Borrower. In connection with purchasing Participations, the Trust generally will
have no right to enforce compliance by the Borrower with the terms of the Loan
Agreement, nor any rights with respect to funds acquired by other Lenders
through set-off against the Borrower and the Trust may not directly benefit from
the collateral supporting the Senior Loan in which it has purchased the
Participation. As a result, the Trust will assume the credit risk of the
Borrower, the Selling Participant and any Intermediate Participants. In the
event of the insolvency of the Selling Participant or any Intermediate
Participant, the Trust may be treated as a general creditor of such entity and
may be adversely affected by any set-off between such entity and the Borrower.
The Trust will acquire Participations only if the Selling Participant and any
Intermediate Participant is a commercial bank or other financial institution
with an investment grade long-term debt rating from either Standard and Poor's
Corporation ("S&P") (rated BBB or higher) or Moody's Investors Service, Inc.
("Moody's") (rated Baa or higher), or with outstanding commercial paper rated at
least in the top two rating categories of either of such rating agencies (at
least A-2 by S&P or at least Prime-2 by Moody's) or, if such long-term debt and
commercial paper are unrated, with long-term debt or
 
                                                                              13
<PAGE>
commercial paper believed by the Investment Advisor to be of comparable quality.
Long-term debt rated BBB by S&P is regarded by S&P as having adequate capacity
to pay interest and repay principal and debt rated Baa by Moody's is regarded by
Moody's as a medium grade obligation, i.e., it is neither highly protected nor
poorly secured, although debt rated Baa by Moody's is considered to have
speculative characteristics. Commercial paper rated A-2 by S&P indicates that
the degree of safety regarding timely payment is considered by S&P to be strong,
and issues of commercial paper rated Prime-2 by Moody's are considered by
Moody's to have a strong capacity for repayment of senior short-term debt
obligations. The Trust will purchase an Assignment or act as one of a group of
Lenders only where the Agent with respect to the Senior Loan is a bank, a member
of a national securities exchange or other entity designated in the Investment
Company Act of 1940, as amended (the "1940 Act"), as qualified to serve as a
custodian for a registered investment company such as the Trust (a "Designated
Custodian"). In addition, the Trust will purchase a Participation initially only
when the Lender selling such Participation, and any other person interpositioned
between such Lender and the Trust, are Designated Custodians. If the Trust
determines in the future to purchase interests in Senior Loans in instances in
which such Agent, Lender or interpositioned person is not a Designated
Custodian, the Trust will seek appropriate relief under the 1940 Act and if such
relief is granted the Trust will thereafter purchase Senior Loans in a manner
consistent with such relief.
 
    The Trust may also purchase Assignments from Lenders and other third
parties. The purchaser of an Assignment typically succeeds to all the rights of
the Lender or other third party whose interest is being assigned, but it may not
be a party to the Loan Agreement and may be required to rely on such Lender or
other third party to demand payment and enforce its rights against the Borrower.
Assignments are arranged through private negotiations between potential
assignors and potential assignees; consequently, the rights and obligations
acquired by the purchaser of an Assignment may differ from and be more limited
than those held by the assignor.
 
    In determining whether to purchase Participations or Assignments or act as
one of a group of Lenders, the Investment Advisor will consider the availability
of each of these forms of investments in Senior Loans, the terms of the Loan
Agreement, and in the case of Participations, the creditworthiness of the
Selling Participant and any Intermediate Participants.
 
    In connection with the purchase of interests in Senior Loans, the Trust may
also acquire warrants and other equity securities of the Borrower or its
affiliates. The acquisition of such equity securities will only be incidental to
the Trust's purchase of interests in Senior Loans.
 
    The Trust will limit its investments to those which could be acquired
directly by national banks for their own portfolios, as provided in 12 U.S.
Code, section 24, paragraph 7 and the implementing regulations and
interpretations of the Comptroller of the Currency. The conditions and
restrictions governing the purchase of Shares by national banks are set forth in
the U.S. Comptroller of the Currency's Banking Circular No. 220, dated November
21, 1986. Subject to such conditions and restrictions, national banks may
acquire Shares for their own investment portfolio.
 
    The Trust is authorized to invest in Senior Notes. It is anticipated that
Senior Notes purchased by the Trust will generally bear a higher rate of
interest than Syndicated Loans. Such securities may, however, involve greater
risks than those associated with Syndicated Loans. The covenants and
restrictions to which the Borrower would be subject in the case of Senior Notes
may not be as rigorous in all respects as those to which the Borrower would be
subject in the case of a Syndicated Loan. Also, the scope of financial
information respecting the Borrower available to investors in Senior Notes may
be more limited than that available to Syndicated Loan Lenders. In addition, a
Syndicated Loan typically requires steady amortization of principal throughout
the life of the loan, whereas Senior Notes typically are structured to allow
Borrowers to repay principal later in the life of the loan.
 
    The investment objective of the Trust and its policy to invest, under normal
market conditions, at least 80% of its total assets in Senior Loans, are
fundamental policies of the Trust and may not be changed without the approval of
a majority of the outstanding voting securities of the Trust, as defined in the
1940 Act. Such a majority is defined as the lesser of (i) 67% or more of the
Trust's Shares present at a meeting of shareholders, if the holders of more than
50% of the outstanding Shares of the Trust are present or represented by proxy,
or (ii) more than 50% of the outstanding Shares of the Trust. Except as
otherwise specified, all other investment policies of the Trust are not
fundamental and may be changed by the Board of Trustees without shareholder
approval.
 
SPECIAL RISK FACTORS
 
The Trust may be required to pay and may receive various fees and commissions in
connection with purchasing, selling and holding interests in Senior Loans. When
the Trust buys an interest in a Senior Loan, it may receive a facility fee,
which is a fee paid to Lenders upon origination of a Senior Loan and/or a
commitment fee which is a fee paid to Lenders on an ongoing basis based upon the
undrawn portion committed by the Lenders of the underlying Senior Loan. In
certain circumstances, the Trust may receive a prepayment penalty on the
prepayment of a Senior Loan by a Borrower. When the Trust sells an interest
 
14
<PAGE>
in a Senior Loan it may be required to pay fees or commissions to the purchaser
of the interest. The extent to which the Trust will be entitled to receive or be
required to pay such fees will generally be a matter of negotiation between the
Trust and the party selling to or purchasing from the Trust. The Investment
Advisor currently anticipates that the Trust will continue to receive and/or pay
fees and commissions in a majority of the transactions involving Senior Loans.
 
    Pursuant to the relevant Loan Agreement, a Borrower may be required in
certain circumstances, and may have the option at any time, to prepay the
principal amount of a Senior Loan, often without incurring a prepayment penalty.
The degree to which Borrowers prepay Senior Loans may be affected by such
factors as general business conditions, the financial condition of the Borrower
and competitive conditions among lenders. Accordingly, prepayment cannot be
predicted with accuracy. Because the interest rates on Senior Loans are
periodically redetermined at relatively short intervals, the Trust and the
Investment Advisor believe that the prepayment of, and subsequent reinvestment
by the Trust in, Senior Loans will not have a materially adverse impact on the
yield on the Trust's portfolio and may have a beneficial impact on income due to
receipt of prepayment penalties, if any, and any facility fees earned in
connection with reinvestment. However, yield could be adversely affected to the
extent that the Trust is unable to reinvest promptly prepayments in Senior
Loans, or, in a period of declining interest rates, to the extent that Borrowers
prepay Senior Loans whose interest rates have not yet been reset to reflect such
declines.
 
    Lenders commonly have certain obligations pursuant to the Loan Agreement,
which may include the obligation to make additional loans or release collateral
in certain circumstances. The Trust will establish a segregated account with its
custodian bank in which it will maintain cash or high quality debt securities
equal in value to its commitments to make such additional loans. In no event
will such commitments exceed 20% of the Trust's total assets.
 
    On behalf of the several Lenders, the Agent typically will be required to
administer and manage the Senior Loan and to service or monitor the collateral.
The Trust will rely on the Agent (where the Trust is a Lender or owns an
Assignment of a Lender's interest) or the Selling Participant (where the Trust
owns a Participation) to collect principal of and interest on a Senior Loan.
Furthermore, the Trust usually will rely on the Agent (where the Trust is a
Lender or owns an Assignment of a Lender's interest) and/or the Selling
Participants (where the Trust owns a Participation) to monitor compliance by the
Borrower with restrictive covenants in the Loan Agreement and notify the Trust
of any adverse change in the Borrower's financial condition or any declaration
of insolvency. The Agent monitors the value of the collateral on an ongoing
basis and, if the value of the collateral declines, may take certain action,
including accelerating principal payments on the Senior Loan, giving the
Borrower an opportunity (or requiring the Borrower if the Loan Agreement so
provides) to provide additional collateral or seeking other protection for the
benefit of the participants in the Senior Loan, depending on the terms of the
Loan Agreement. Furthermore, unless the Trust's interest in a Senior Loan
affords it the right to direct recourse against the Borrower, the Trust will
rely on the Agent to use appropriate creditor remedies against the Borrower.
Typically, the Agent will have broad discretion in enforcing the terms of a Loan
Agreement.
 
    Loan Agreements typically provide for the termination of the Agent's agency
status in the event that it fails to act as required under the relevant Loan
Agreement, becomes insolvent, or has a receiver, conservator or similar official
appointed for it by the appropriate bank regulatory authority or becomes a
debtor in a bankruptcy proceeding. Should such an Agent or a Selling
Participant, Intermediate Participant or assignor with respect to an Assignment
become insolvent or have a receiver, conservator or similar official appointed
for it by the appropriate bank regulatory authority or become a debtor in a
bankruptcy proceeding, the Trust believes that its interest in the Senior Loan
and any loan payment held by such person for the benefit of the Trust should not
be included in such person's estate. If, however, any such amount were included
in such person's estate, the Trust would incur certain costs and delays in
realizing payment or could suffer a loss of principal and/or interest. Even if
such amount is not included in such person's estate, the possibility exists that
the servicing of the Senior Loans may be temporarily disrupted and that there
could be delays in the receipt of principal and/or interest by the Trust which
would adversely affect income and net asset value.
 
    Senior Loans, like other corporate debt obligations, are subject to the risk
of nonpayment of scheduled interest or principal. Such nonpayment would result
in a reduction of income to the Trust, a reduction in the value of the Senior
Loan experiencing nonpayment and a decrease in the net asset value of the Trust.
Although the Trust will invest only in Senior Loans that the Investment Advisor
believes are secured by collateral, the value of which equals or exceeds the
principal amount of the Senior Loan, the value of the collateral pledged by the
Borrower under a Senior Loan, including any additional collateral which the Loan
Agreement may require the Borrower to pledge, may decline below the amount of
the Senior Loan after the acquisition of the interest in the Senior Loan. If
this were to occur, the Trust would be exposed to the risk that the value of the
collateral will not at all times equal or exceed the amount of the Borrower's
obligations under the Senior Loan. Furthermore, there is no assurance that the
liquidation of the collateral would satisfy the Borrower's obligation in the
event of nonpayment of scheduled interest or principal, or that the collateral
could be readily liquidated. As a result, the Trust may not receive payments to
which it is entitled and thereby is likely to experience a decline in the value
of its investment and in its net asset value.
 
                                                                              15
<PAGE>
    Senior Loans made in connection with leveraged buy-outs and other highly
leveraged transactions are subject to greater credit risks than loans made to
less leveraged Borrowers. These credit risks include the possibility of default
or bankruptcy of the Borrower, and the assertion that the pledging of collateral
to secure the loan constituted a fraudulent conveyance or preferential transfer
which can be nullified or subordinated to the rights of other creditors of the
Borrower under applicable law. The value of such Senior Loans also may be
subject to a greater degree of volatility in response to interest rate
fluctuations and may be less liquid than other Senior Loans.
 
    Senior Loans in which the Trust will invest presently are not rated by a
nationally recognized statistical rating agency, will not be registered with the
Securities and Exchange Commission ("SEC") or any state securities commission
and will not be listed on any national securities exchange. Although the Trust
will generally have access to financial and other information made available to
the Lenders in connection with Senior Loans, the amount of public information
available with respect to Senior Loans will generally be less extensive than
that available for rated, registered and/or exchange listed securities. As a
result, the performance of the Trust and its ability to meet its investment
objective is more dependent on the analytical ability of the Investment Advisor
than would be the case for an investment company that invests primarily in
rated, registered and/ or exchange listed securities.
 
    Senior Loans are at present not readily marketable and are often subject to
restrictions on resale. For example, bank approval is often required for resale
of interests in Senior Loans. Although interests in Senior Loans may be
transferable among financial institutions, such interests do not at present have
the liquidity of conventional debt securities traded in the secondary market.
The substantial portion of the Trust's assets invested in interests in Senior
Loans may restrict the ability of the Trust to dispose of its investments in
Senior Loans in a timely fashion and at a fair price, and could result in
capital losses to the Trust and holders of Shares. Such risks are particularly
acute in situations where the Trust's operations require cash, such as when the
Trust tenders for its Shares, and may result in the Trust's borrowing to meet
short-term cash requirements. The Board of Trustees of the Trust will consider
the liquidity of the Trust's portfolio investments in determining whether a
tender offer should be made by the Trust and the number of Shares offered to be
purchased pursuant thereto.
 
    The Trust has registered as a "non-diversified" investment company so that,
subject to its investment restrictions, it will be able to invest more than 5%
of the value of its total assets in the obligations of any single issuer,
including Senior Loans of a single Borrower or Participations purchased from a
single Lender or Selling Participant. However, the Trust does not intend to
invest more than 10% of the value of its total assets in interests in Senior
Loans of a single Borrower. To the extent the Trust invests its assets in
obligations of a more limited number of issuers than a diversified investment
company, the Trust will be more susceptible than a diversified investment
company to any single corporate, economic, political or regulatory occurrence.
 
    In addition, the Trust may invest up to 100% of its assets in
Participations. Because the Trust will regard the Selling Participants and
Intermediate Participants as issuers, the Trust may be deemed to be concentrated
in securities of issuers in the industry group consisting of financial
institutions and their holding companies, including commercial banks, thrift
institutions, insurance companies and finance companies. As a result, the Trust
is subject to certain risks associated with such institutions. Banking and
thrift institutions are subject to extensive governmental regulations which may
limit both the amounts and types of loans and other financial commitments which
such institutions may make and the interest rates and fees which such
institutions may charge. The profitability of these institutions is largely
dependent on the availability and cost of capital funds, and has shown
significant recent fluctuation as a result of volatile interest rate levels. In
addition, general economic conditions are important to the operations of these
institutions, with exposure to credit losses resulting from possible financial
difficulties of borrowers potentially having an adverse effect. Insurance
companies also are affected by economic and financial conditions and are subject
to extensive government regulation, including rate regulation. The property and
casualty industry is cyclical, being subject to dramatic swings in profitability
which can be affected by natural catastrophes and other disasters. Individual
companies may be exposed to material risks, including reserve inadequacy, latent
health exposure, and inability to collect from their reinsurance carriers. The
financial services area is currently undergoing relatively rapid change as
existing distinctions between financial service segments become less clear. In
this regard, recent business combinations have included insurance, finance and
securities brokerage under single ownership. Moreover, the federal laws
generally separating commercial and investment banking are currently being
studied by Congress. Also, the Trust could be adversely affected if Selling
Participants and Intermediate Participants were to become overexposed to
leveraged buy-outs or other loans.
 
INVESTMENT PRACTICES
- --------------------------------------------------------------------------------
 
The following investment practices apply to the portfolio investments of the
Trust and may be changed by the Trustees of the Trust without shareholder
approval, following written notice to shareholders.
 
16
<PAGE>
WHEN-ISSUED AND DELAYED DELIVERY TRANSACTIONS
 
The Trust may purchase and sell interests in Senior Loans and other securities
in which the Trust may invest or dispose of on a when-issued or delayed delivery
basis; i.e., delivery and payment can take place more than 30 days after the
date of the transaction. The interests or securities so purchased or sold are
subject to market fluctuation during this period and no interest accrues to the
purchaser prior to the date of settlement. At the time the Trust makes the
commitment to enter into a when-issued or delayed delivery transaction, it will
record the transaction and thereafter reflect the value, each day, of such
interest or security in determining the net asset value of the Trust. At the
time of delivery, the value of the interest or security may be more or less than
the purchase price. Since the Trust is dependent on the party issuing the
when-issued or delayed delivery security to complete the transaction, failure by
the other party to deliver the interest or security as arranged would result in
the Trust losing an investment opportunity. The Trust will also establish a
segregated account with its custodian bank in which it will maintain cash or
high quality debt securities equal in value to commitments for such when-issued
or delayed delivery interests or other securities; subject to this requirement,
the Trust may enter into transactions on such basis without limit.
 
REPURCHASE AGREEMENTS
 
When cash may be available for only a few days, it may be invested by the Trust
in repurchase agreements until such time as it may otherwise be invested or used
for payments of obligations of the Trust. These agreements, which may be viewed
as a type of secured lending by the Trust, typically involve the acquisition by
the Trust of debt securities from a selling financial institution such as a
bank, savings and loan association or broker-dealer. The agreement provides that
the Trust will sell back to the institution, and that the institution will
repurchase, the underlying security ("collateral"), which is held by the Trust's
custodian, at a specified price and at a fixed time in the future, usually not
more than seven days from the date of purchase. The Trust will receive interest
from the institution until the time when the repurchase is to occur. Although
such date is deemed by the Trust to be the maturity date of a repurchase
agreement, the maturities of securities subject to repurchase agreements are not
subject to any limits and may exceed one year. While repurchase agreements
involve certain risks not associated with direct investments in debt securities,
the Trust will follow procedures adopted by the Trustees designed to minimize
such risks. These procedures include effecting repurchase transactions only with
large, well-capitalized and well-established financial institutions, whose
financial condition will be continually monitored by the Investment Advisor. In
addition, the value of the collateral underlying the repurchase agreement will
be maintained at a level at least equal to the repurchase price, including any
accrued interest earned on the repurchase agreement. In the event of a default
or bankruptcy by a selling financial institution, the Trust will seek to
liquidate such collateral. However, the exercising of the Trust's right to
liquidate such collateral could involve certain costs or delays and, to the
extent that proceeds from any sale upon a default of the obligation to
repurchase were less than the repurchase price, the Trust could suffer a loss.
In addition, to the extent that the Trust's security interest in the collateral
may not be properly perfected, the Trust could suffer a loss up to the entire
amount of the collateral. It is the policy of the Trust not to invest in
repurchase agreements that do not mature within seven days if any such
investments amount to more than 10% of its total assets.
 
REVERSE REPURCHASE AGREEMENTS
 
The Trust may enter into reverse repurchase agreements with respect to debt
obligations which could otherwise be sold by the Trust. A reverse repurchase
agreement is an instrument under which the Trust may sell an underlying debt
instrument and simultaneously obtain the commitment of the purchaser (a
commercial bank or a broker or dealer) to sell the security back to the Trust at
an agreed upon price on an agreed upon date. The value of the underlying
securities will be at least equal at all times to the total amount of the resale
obligation, including the interest factor. Reverse repurchase agreements could
involve certain risks in the event of default or insolvency of the other party,
including possible delays or restrictions upon the Trust's ability to dispose of
the underlying securities. An additional risk is that the market value of
securities sold by the Trust under a reverse repurchase agreement could decline
below the price at which the Trust is obligated to repurchase them. Reverse
repurchase agreements will be considered borrowings by the Trust and as such
would be subject to the restrictions on borrowing described below under
"Investment Restrictions." The Trust will not hold more than 5% of the value of
its total assets in reverse repurchase agreements.
 
LENDING OF PORTFOLIO SECURITIES
 
Consistent with applicable regulatory requirements, the Trust may lend its
portfolio securities to brokers, dealers and financial institutions, provided
that such loans are callable at any time by the Trust (subject to notice
provisions described below), and are at all times secured by cash or cash
equivalents, which are maintained in a segregated account pursuant to applicable
regulations and that are equal to at least 102% of the market value, determined
daily, of the loaned securities. The
 
                                                                              17
<PAGE>
advantage of such loans is that the Trust continues to receive the income on
collateral, which will be invested in short-term obligations. The Trust will not
lend its portfolio securities if such loans are not permitted by the laws or
regulations of any state in which its shares are qualified for sale and will not
lend more than 25% of the value of its total assets.
 
    A loan may be terminated by the borrower on one business day's notice, or by
the Trust on four business days' notice. If the borrower fails to deliver the
loaned securities within four days after receipt of notice, the Trust could use
the collateral to replace the securities while holding the borrower liable for
any excess of replacement cost over collateral. As with any extensions of
credit, there are risks of delay in recovery and in some cases even loss of
rights in the collateral should the borrower of the securities fail financially.
However, these loans of portfolio securities will be made only to firms deemed
by the Investment Advisor to be creditworthy and when the income which can be
earned from such loans justifies the attendant risks. Upon termination of the
loan, the borrower is required to return the securities to the Trust. Any gain
or loss in the market price during the loan period would inure to the Trust. The
creditworthiness of firms to which the Trust lends its portfolio securities will
be monitored on an ongoing basis by the Investment Advisor pursuant to
procedures adopted and reviewed, on an ongoing basis, by the Trustees of the
Trust.
 
    When voting on consent rights which accompany loaned securities pass to the
borrower, the Trust will follow the policy of calling the loaned securities, to
be delivered within one day after notice, to permit the exercise of such rights
if the matters involved would have a material effect on the Trust's investment
in such loaned securities. The Trust will pay reasonable finder's,
administrative and custodial fees in connection with a loan of its securities.
 
BORROWING
 
The Trust may borrow money from a bank for temporary or emergency purposes or to
effect a tender offer for its Shares provided that immediately after such
borrowing the amount borrowed does not exceed 33 1/3% of the value of its total
assets (including the amount borrowed) less its liabilities (not including any
borrowings but including the fair market value at the time of computation of any
other senior securities then outstanding). If, due to market fluctuations or
other reasons, the value of the Trust's assets falls below the foregoing
required coverage requirement, the Trust, within three business days, will
reduce its bank debt to the extent necessary to comply with such requirement. To
achieve such reduction, it is possible that the Trust may be required to sell
portfolio securities at a time when it may be disadvantageous to do so.
 
    Borrowings other than for temporary or emergency purposes would involve
additional risk to the Trust, since the interest expense may be greater than the
income from or appreciation of the interests carried by the borrowing. The Trust
may be required to maintain minimum average balances in connection with
borrowings or to pay a commitment or other fee to maintain a line of credit.
Either of these requirements will increase the cost of borrowing over the stated
interest rate. Investment activity will continue while the borrowing is
outstanding. The purchase of additional interests while any borrowing is
outstanding involves the speculative factor known as "leverage," which will
increase the Trust's exposure to capital risk.
 
HEDGING AND RISK MANAGEMENT TRANSACTIONS
 
The Trust is authorized to engage in various interest rate hedging transactions
and risk management transactions, including interest rate swaps and the purchase
and sale of interest rate caps and floors. These techniques are described in
Appendix A. The Trust does not, however, presently intend to engage in such
hedging and risk management transactions, and, if the Trust is offering its
Shares, will not do so unless and until the Trust's prospectus is revised to
reflect this change.
 
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
The investment restrictions listed below have been adopted by the Trust as
fundamental policies, which may not be changed without the vote of a majority,
as defined in the 1940 Act, of the outstanding voting securities of the Trust.
All other investment policies or practices, other than the Trust's investment
policy with respect to Senior Loans, are considered by the Trust not to be
fundamental and accordingly may be changed without shareholder approval. All
percentage limitations apply immediately after a purchase or initial investment,
and any subsequent change in any applicable percentage resulting from market
fluctuations or other changes in the amount of total or net assets does not
require elimination of any security from the portfolio.
 
    The Trust may not:
 
         1. Invest more than 25% of the Trust's total assets in the securities
    of any one issuer or, with respect to 50% of the Trust's total assets,
    purchase any securities (other than obligations issued or guaranteed by the
    United States Government or by its agencies or instrumentalities), if as a
    result more than 5% of the Trust's total assets would then be
 
18
<PAGE>
    invested in securities of a single issuer or if as a result the Trust would
    hold more than 10% of the outstanding voting securities of any single
    issuer. For purposes of this restriction and restriction number two, the
    Trust will consider a Borrower to be the issuer of a Participation and, with
    respect to Participations under which the Trust does not have privity with
    the Borrower or would not have a direct cause of action against the Borrower
    in the event of its failure to pay scheduled principal or interest, the
    Trust will also separately meet the requirements contained in this
    investment restriction and consider each person interpositioned between the
    Borrower and the Trust to be an issuer of the Participation.
 
         2. Invest 25% or more of the value of its total assets in securities of
    issuers in any one industry (the electric, gas, water and telephone utility
    industries will be treated as separate industries for purposes of this
    restriction); provided that this limitation shall not apply with respect to
    obligations issued or guaranteed by the U.S. Government or by its agencies
    or instrumentalities; and provided further that the Trust will (once at
    least 80% of the Trust's assets are invested in Senior Loans) invest more
    than 25% and may invest up to 100% of its total assets in securities of
    issuers in the industry group consisting of financial institutions and their
    holding companies, including commercial banks, thrift institutions,
    insurance companies and finance companies. (See restriction number one for
    the definition of issuer for purposes of this restriction.)
 
         3. Invest in common stock, except that the Trust may acquire warrants
    or other equity securities incidental to the purchase of an interest in a
    Senior Loan.
 
         4. Invest in securities of any issuer if, to the knowledge of the
    Trust, any officer or trustee of the Trust or any officer or director of the
    Investment Advisor or DWR owns more than 1/2 of 1% of the outstanding
    securities of such issuer, and such officers, trustees and directors who own
    more than 1/2 of 1% own in the aggregate more than 5% of the outstanding
    securities of such issuer.
 
         5. Purchase or sell real estate or interests therein, commodities or
    commodity contracts except pursuant to the exercise by the Trust of its
    rights under Loan Agreements, except to the extent the interest in Senior
    Loans the Trust may invest in are considered to be interests in real estate,
    commodities or commodities contracts and except to the extent that hedging
    instruments the Trust may invest in are considered to be commodities or
    commodities contracts.
 
         6. Purchase oil, gas or other mineral leases, rights or royalty
    contracts, or exploration or development programs, except pursuant to the
    exercise by the Trust of its rights under Loan Agreements. In addition, the
    Trust may purchase securities of issuers which deal in, represent interests
    in or are secured by interests in such leases, rights or contracts.
 
         7. Write, purchase or sell puts, calls or combinations thereof, except
    for options on futures contracts or options on debt securities.
 
         8. Purchase securities of other investment companies, except in
    connection with a merger, consolidation, reorganization or acquisition of
    assets or, by purchase in the open market of securities of closed-end
    investment companies where no underwriter's or dealer's commission or
    profit, other than customary broker's commissions, is involved and only if
    immediately thereafter not more than: (a) 5% of the Trust's total assets
    would be invested in any one such company and (b) 10% of the Trust's total
    assets would be invested in such securities. The Trust will rely on
    representations of Borrowers in Loan Agreements in determining whether such
    Borrowers are investment companies.
 
         9. Borrow money, except that the Trust may borrow from a bank for
    temporary or emergency purposes or for the repurchase of Shares, provided
    that immediately after such borrowing the amount borrowed does not exceed
    33 1/3% of the value of its total assets (including the amount borrowed)
    less its liabilities (not including any borrowings but including the fair
    market value at the time of computation of any other senior securities which
    are outstanding at the time).
 
        10. Pledge, mortgage or hypothecate its assets or assign or otherwise
    encumber them, except to secure borrowings effected within the limitations
    set forth in Restriction 9 (and then only to the extent of 33 1/3% of the
    value of the Trust's total assets) and except pursuant to reverse repurchase
    agreements as provided in this Prospectus. However, for the purpose of this
    restriction, collateral arrangements with respect to the writing of options
    and collateral arrangements with respect to initial margin for futures are
    not deemed to be pledges of assets.
 
        11. Issue senior securities, as defined in the 1940 Act, except insofar
    as the Trust may be deemed to have issued a senior security by reason of:
    (a) entering into any repurchase agreement; (b) purchasing any securities on
    a when-issued or delayed delivery basis; (c) entering into the hedging
    transactions described in this prospectus, including Appendix A; (d)
    borrowing money in accordance with restrictions described above; or (e)
    lending portfolio securities.
 
        12. Make loans of money or securities, except: (a) by acquiring
    interests in Senior Loans and making other permitted investments in
    accordance with its investment objective; (b) by entering into repurchase
    agreements (provided that no more than 10% of the Trust's total assets will
    be invested in repurchase agreements that do not mature
 
                                                                              19
<PAGE>
    within seven days) or reverse repurchase agreements; and (c) by lending its
    portfolio securities (provided that the Trust may not lend its portfolio
    securities in excess of 25% of its total assets).
 
        13. Make short sales of securities.
 
        14. Purchase securities on margin. Neither the deposit of initial or
    variation margin in connection with hedging transactions nor short-term
    credits as may be necessary for the clearance of such transactions is
    considered the purchase of a security on margin.
 
        15. Engage in the underwriting of securities, except to the extent the
    Trust may be deemed to be an underwriter in connection with the sale of or
    granting of interests in Senior Loans or other securities acquired by the
    Trust.
 
        16. Make investments for the purpose of exercising control or management
    of any other issuer, except to the extent that exercise by the Trust of its
    rights under Loan Agreements would be deemed to constitute such control or
    participation.
 
    The Trust generally will not engage in the trading of securities for the
purpose of realizing short-term profits, but it will adjust its portfolio as it
deems advisable in view of prevailing or anticipated market conditions to
accomplish the Trust's investment objective. For example, the Trust may sell
portfolio securities in anticipation of a movement in interest rates. Frequency
of portfolio turnover will not be a limiting factor if the Trust considers it
advantageous to purchase or sell securities. The Trust anticipates that the
annual portfolio turnover rate of the Trust will be less than 100%. A high rate
of portfolio turnover involves correspondingly greater expenses than a lower
rate, which expenses must be borne by the Trust and its shareholders. High
portfolio turnover also may result in the realization of substantial net
short-term capital gains. In order to continue to qualify as a regulated
investment company for federal income tax purposes, less than 30% of the annual
gross income of the Trust must be derived from the sale of securities held by
the Trust for less than three months. See "Taxation." The Trust's portfolio
turnover rate for the fiscal year ended September 30, 1997 was 86%.
 
TRUSTEES AND OFFICERS
- --------------------------------------------------------------------------------
 
The Trustees and Executive Officers of the Trust and their principal occupations
for at least the last five years and their affiliations, if any, with MSDW
Advisors and with the 86 Morgan Stanley Dean Witter Funds and the 11 TCW/DW
Funds are shown below.
 
<TABLE>
<CAPTION>
        NAME, AGE, POSITION WITH THE TRUST
                    AND ADDRESS                         PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ---------------------------------------------------  ---------------------------------------------------
<S>                                                  <C>
Michael Bozic (57) ................................  Chairman and Chief Executive Officer of Levitz
Trustee                                              Furniture Corporation (since November, 1995);
c/o Levitz Furniture Corporation                     Director or Trustee of the Morgan Stanley Dean
7887 N. Federal Highway                              Witter Funds; formerly President and Chief
Boca Raton, Florida                                  Executive Officer of Hills Department Stores (May,
                                                     1991-July, 1995); formerly variously Chairman,
                                                     Chief Executive Officer, President and Chief
                                                     Operating Officer (1987-1991) of the Sears
                                                     Merchandise Group of Sears, Roebuck and Co.;
                                                     Director of Eaglemark Financial Services, Inc. and
                                                     Weirton Steel Corporation.
Charles A. Fiumefreddo* (65) ......................  Chairman, Director or Trustee, President and Chief
Chairman,                                            Executive Officer of the Morgan Stanley Dean Witter
President, Chief Executive Officer and Trustee       Funds; Chairman, Chief Executive Officer and
Two World Trade Center                               Trustee of the TCW/ DW Funds; formerly Chairman,
New York, New York                                   Chief Executive Officer and Director of MSDW
                                                     Advisors, MSDW Distributors and MSDW Services,
                                                     Executive Vice President and Director of Dean
                                                     Witter Reynolds Inc. ("DWR"), Chairman and Director
                                                     of Morgan Stanley Dean Witter Trust FSB ("MSDW
                                                     Trust"), and Director and/or officer of various
                                                     MSDW subsidiaries (until June 1, 1998).
</TABLE>
 
20
<PAGE>
<TABLE>
<CAPTION>
        NAME, AGE, POSITION WITH THE TRUST
                    AND ADDRESS                         PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ---------------------------------------------------  ---------------------------------------------------
<S>                                                  <C>
Edwin J. Garn (65) ................................  Director or Trustee of the Morgan Stanley Dean
Trustee                                              Witter Funds; formerly United States Senator
c/o Huntsman Corporation                             (R-Utah) (1974-1992) and Chairman, Senate Banking
500 Huntsman Way                                     Committee (1980-1986); formerly Mayor of Salt Lake
Salt Lake City, Utah                                 City, Utah (1971-1974); formerly Astronaut, Space
                                                     Shuttle Discovery (April 12-19, 1985); Vice
                                                     Chairman, Huntsman Corporation (since January,
                                                     1993); Director of Franklin Covey (time management
                                                     systems) and John Alden Financial Corp. (health
                                                     insurance), United Space Alliance (joint venture
                                                     between Lockheed Martin and the Boeing Company) and
                                                     Nuskin Asia Pacific (multilevel marketing); Member
                                                     of the board of various civic and charitable
                                                     organizations.
John R. Haire (73) ................................  Chairman of the Audit Committee and Director or
Trustee                                              Trustee of the Morgan Stanley Dean Witter Funds;
Two World Trade Center                               Chairman of the Audit Committee and Trustee of the
New York, New York                                   TCW/DW Funds; formerly Chairman of the Independent
                                                     Directors or Trustees of the Morgan Stanley Dean
                                                     Witter Funds and the TCW/DW Funds (until June,
                                                     1998); formerly President, Council for Aid to
                                                     Education (1978-1989) and Chairman and Chief
                                                     Executive Officer of Anchor Corporation, an
                                                     Investment Advisor (1964-1978).
Wayne E. Hedien (64) ..............................  Retired; Director or Trustee of the Morgan Stanley
Trustee                                              Dean Witter Funds; Director of the PMI Group, Inc.
c/o Gordon Altman Butowsky Weitzen                   (Private mortgage insurance); Trustee and Vice
 Shalov & Wein                                       Chairman of the Field Museum of Natural History;
Counsel to the Independent Trustees                  formerly associated with the Allstate Companies
114 West 47th Street                                 (1966-1994), most recently as Chairman of the
New York, New York                                   Allstate Corporation (March, 1993-December, 1994)
                                                     and Chairman and Chief Executive Officer of its
                                                     wholly-owned subsidiary, Allstate Insurance Company
                                                     (July, 1989-December, 1994); director of various
                                                     other business and charitable organizations.
Dr. Manuel H. Johnson (49) ........................  Senior Partner, Johnson Smick International, Inc.,
Trustee                                              a consulting firm; Co-Chairman and a founder of the
c/o Johnson Smick International, Inc.                Group of Seven Council (G7C), an international
1133 Connecticut Avenue, N.W.                        economic commission; Director or Trustee of the
Washington, D.C.                                     Morgan Stanley Dean Witter Funds; Trustee of the
                                                     TCW/DW Funds; Director of NASDAQ (since June,
                                                     1995); Director of Greenwich Capital Markets, Inc.
                                                     (broker-dealer) and NVR, Inc. (home construction);
                                                     Chairman and Trustee of the Financial Accounting
                                                     Foundation (oversight organization of the Financial
                                                     Accounting Standards Board); formerly Vice Chairman
                                                     of the Board of Governors of the Federal Reserve
                                                     System (1986-1990) and Assistant Secretary of the
                                                     U.S. Treasury (1982-1986).
Michael E. Nugent (62) ............................  General Partner, Triumph Capital, L.P., a private
Trustee                                              investment partnership; Director or Trustee of the
c/o Triumph Capital, L.P.                            Morgan Stanley Dean Witter Funds; Trustee of the
237 Park Avenue                                      TCW/DW Funds; formerly Vice President, Bankers
New York, New York                                   Trust Company and BT Capital Corporation
                                                     (1984-1988); director of various business
                                                     organizations.
Philip J. Purcell* (54) ...........................  Chairman of the Board of Directors and Chief
Trustee                                              Executive Officer of MSDW, DWR and Novus Credit
Two World Trade Center                               Services Inc.; Director of MSDW Distributors;
New York, New York                                   Director or Trustee of the Morgan Stanley Dean
                                                     Witter Funds; Director and/or officer of various
                                                     MSDW subsidiaries.
</TABLE>
 
                                                                              21
<PAGE>
<TABLE>
<CAPTION>
        NAME, AGE, POSITION WITH THE TRUST
                    AND ADDRESS                         PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ---------------------------------------------------  ---------------------------------------------------
<S>                                                  <C>
John L. Schroeder (67) ............................  Retired; Director or Trustee of the Morgan Stanley
Trustee                                              Dean Witter Funds; Trustee of the TCW/DW Funds;
c/o Gordon Altman Butowsky Weitzen                   Director of Citizens Utilities Company; formerly,
 Shalov & Wein                                       Executive Vice President and Chief Investment
Counsel to the Independent Trustees                  Officer of the Home Insurance Company (August,
114 West 47th St.                                    1991-September, 1995).
New York, New York
Barry Fink (43) ...................................  Senior Vice President (since March, 1997),
Vice President, Secretary and General Counsel        Secretary and General Counsel (since February,
Two World Trade Center                               1997) and Director (since July, 1998) of MSDW
New York, New York                                   Advisors and MSDW Services; Senior Vice President
                                                     (since March, 1997) and Assistant Secretary and
                                                     Assistant General Counsel (since February, 1997) of
                                                     MSDW Distributors; Assistant Secretary of DWR
                                                     (since August, 1996); Vice President, Secretary and
                                                     General Counsel of the Dean Witter Funds and the
                                                     TCW/DW Funds (since February, 1997); previously
                                                     First Vice President (June, 1993-February, 1997),
                                                     Vice President (until June, 1993) and Assistant
                                                     Secretary and Assistant General Counsel of MSDW
                                                     Advisors and MSDW Services and Assistant Secretary
                                                     of the Morgan Stanley Dean Witter Funds and the
                                                     TCW/DW Funds.
Rajesh K. Gupta (38) ..............................  Senior Vice President of MSDW Advisors; Vice
Vice President                                       President of various Morgan Stanley Dean Witter
Two World Trade Center                               Funds.
New York, New York
Sheila A. Finnerty (32) ...........................  Vice President of MSDW Advisors (since May, 1998);
Assistant Vice President                             previously Assistant Vice President (May, 1995-May,
Two World Trade Center                               1998) and Senior Research Analyst (May, 1993-May,
New York, New York                                   1995) with MSDW Advisors and prior thereto an
                                                     investment analyst with Presidential Life Insurance
                                                     Company (April, 1990-May, 1993).
Peter Gewirtz (32) ................................  Assistant Vice President of MSDW Advisors (since
Assistant Vice President                             May, 1998); previously Senior Research Analyst with
Two World Trade Center                               MSDW Advisors (October, 1996-May, 1998) and prior
New York, New York                                   thereto Assistant Vice President of Industrial Bank
                                                     of Japan (February, 1994-October, 1996) and an
                                                     Associate of Toronto-Dominion Bank (July,
                                                     1991-February, 1994).
Thomas F. Caloia (52) .............................  First Vice President and Assistant Treasurer of
Treasurer                                            MSDW Advisors and MSDW Services; Treasurer of the
Two World Trade Center                               Morgan Stanley Dean Witter Funds and the TCW/DW
New York, New York                                   Funds.
</TABLE>
 
- ------------------------
 
*   Denotes Trustees who are "interested persons" of the Trust, as defined in
    the 1940 Act.
 
    In addition, Mitchell M. Merin, President, Chief Executive Officer and
Director of MSDW Advisors and MSDW Services, Chairman and Director of MSDW
Distributors and MSDW Trust, Executive Vice President of DWR, and Director of
SPS Transaction Services, Inc. and various other MSDW subsidiaries, Robert M.
Scanlan, President, Chief Operating Officer and Director of MSDW Advisors and
MSDW Services, Executive Vice President of MSDW Distributors and MSDW Trust and
Director of MSDW Trust, Robert S. Giambrone, Senior Vice President of MSDW
Advisors, MSDW Services, MSDW Distributors and MSDW Trust and Director of MSDW
Trust, and Joseph J. McAlinden, Executive Vice President and Chief Investment
Officer of MSDW Advisors and Director of MSDW Trust are Vice Presidents of the
Fund, and Marilyn K. Cranney and Carsten Otto, First Vice Presidents and
Assistant General Counsels of MSDW Advisors and MSDW Services, Frank
Bruttomesso, LouAnne D. McInnis and Ruth Rossi, Vice Presidents and Assistant
General Counsels of MSDW Advisors and MSDW Services, and Todd Lebo, a staff
attorney with MSDW Advisors, are Assistant Secretaries of the Fund.
 
22
<PAGE>
THE BOARD OF TRUSTEES, THE INDEPENDENT TRUSTEES, AND THE COMMITTEES
 
The Board of Trustees consists of nine (9) trustees. These same individuals also
serve as directors or trustees for all of the Morgan Stanley Dean Witter Funds,
and are referred to in this section as Trustees. As of the date of this
Statement of Additional Information, there are a total of 86 Morgan Stanley Dean
Witter Funds, comprised of 130 portfolios. As of June 30, 1998, the Morgan
Stanley Dean Witter Funds had total net assets of approximately $106 billion and
more than six million shareholders.
 
    Seven Trustees (77% of the total number) have no affiliation or business
connection with MSDW Advisors or any of its affiliated persons and do not own
any stock or other securities issued by MSDW Advisors' parent company, MSDW.
These are the "disinterested" or "independent" Trustees. Four of the seven
independent Trustees are also Independent Trustees of the TCW/DW Funds.
 
    Law and regulation establish both general guidelines and specific duties for
the Independent Trustees. The Morgan Stanley Dean Witter Funds seek as
Independent Trustees individuals of distinction and experience in business and
finance, government service or academia; these are people whose advice and
counsel are in demand by others and for whom there is often competition. To
accept a position on the Funds' Boards, such individuals may reject other
attractive assignments because the Funds make substantial demands on their time.
Indeed, by serving on the Funds' Boards, certain Trustees who would otherwise be
qualified and in demand to serve on bank boards would be prohibited by law from
doing so.
 
    All of the Independent Trustees serve as members of the Audit Committee and
the Committee of the Independent Trustees. Three of them also serve as members
of the Derivatives Committee. During the calendar year ended December 31, 1997,
the Audit Committee, the Derivatives Committee and the Independent Trustees held
a combined total of seventeen meetings.
 
    The Independent Trustees are charged with recommending to the full Board
approval of management, advisory and administration contracts, Rule 12b-1 plans
and distribution and underwriting agreements; continually reviewing Fund
performance; checking on the pricing of portfolio securities, brokerage
commissions, transfer agent costs and performance, and trading among Funds in
the same complex; and approving fidelity bond and related insurance coverage and
allocations, as well as other matters that arise from time to time. The
Independent Trustees are required to select and nominate individuals to fill any
Independent Trustee vacancy on the Board of any Fund that has a Rule 12b-1 plan
of distribution. Most of the Morgan Stanley Dean Witter Funds have such a plan.
 
    The Audit Committee is charged with recommending to the full Board the
engagement or discharge of the Trust's independent accountants; directing
investigations into matters within the scope of the independent accountants'
duties, including the power to retain outside specialists; reviewing with the
independent accountants the audit plan and results of the auditing engagement;
approving professional services provided by the independent accountants and
other accounting firms prior to the performance of such services; reviewing the
independence of the independent accountants; considering the range of audit and
non-audit fees; and reviewing the adequacy of the Trust's system of internal
controls.
 
    Finally, the Board of each Fund has formed a Derivatives Committee to
approve parameters for and monitor the activities of the Trust with respect to
derivative investments, if any, made by the Trust.
 
ADVANTAGES OF HAVING SAME INDIVIDUALS AS INDEPENDENT TRUSTEES FOR ALL MORGAN
STANLEY DEAN WITTER FUNDS
 
The Independent Trustees and the Funds' management believe that having the same
Independent Trustees for each of the Morgan Stanley Dean Witter Funds avoids the
duplication of effort that would arise from having different groups of
individuals serving as Independent Trustees for each of the Funds or even of
sub-groups of Funds. They believe that having the same individuals serve as
Independent Trustees of all the Funds tends to increase their knowledge and
expertise regarding matters which affect the Fund complex generally and enhances
their ability to negotiate on behalf of each Fund with the Fund's service
providers. This arrangement also precludes the possibility of separate groups of
Independent Trustees arriving at conflicting decisions regarding operations and
management of the Funds and avoids the cost and confusion that would likely
ensue. Finally, having the same Independent Trustees serve on all Fund Boards
enhances the ability of each Fund to obtain, at modest cost to each separate
Fund, the services of Independent Trustees of the caliber, experience and
business acumen of the individuals who serve as Independent Trustees of the
Morgan Stanley Dean Witter Funds.
 
COMPENSATION OF INDEPENDENT TRUSTEES
 
The Trust pays each Independent Trustee an annual fee of $800 plus a per meeting
fee of $50 for meetings of the Board of Trustees, the Independent Trustees or
Committees of the Board of Trustees attended by the Trustee (the Fund pays the
 
                                                                              23
<PAGE>
Chairman of the Audit Committee an additional annual fee of $750). If a Board
meeting and a meeting of the Independent Trustees or a Committee meeting, or a
meeting of the Independent Trustees and/or more than one Committee meeting, take
place on a single day, the Trustees are paid a single meeting fee by the Trust.
The Trust also reimburses such Trustees for travel and other out-of-pocket
expenses incurred by them in connection with attending such meetings. Trustees
and officers of the Trust who are or have been employed by the Investment
Manager or an affiliated company receive no compensation or expense
reimbursement from the Trust for their services as Trustee. Mr. Haire currently
serves as Chairman of the Audit Committee. Prior to June 1, 1998, Mr. Haire also
served as Chairman of the Independent Trustees, for which services the Trust
paid him an additional annual fee of $1,200.
 
    The following table illustrates the compensation paid to the Trust's
Independent Trustees by the Fund for the fiscal year ended September 30, 1997.
                               TRUST COMPENSATION
 
<TABLE>
<CAPTION>
                                                                   AGGREGATE
                                                                 COMPENSATION
NAME OF INDEPENDENT TRUSTEE                                      FROM THE FUND
- --------------------------------------------------------------  ---------------
<S>                                                             <C>
Michael Bozic.................................................      $1,650
Edwin J. Garn.................................................       1,850
John R. Haire.................................................       3,800
Wayne E. Hedien...............................................         250
Dr. Manuel H. Johnson.........................................       1,800
Michael E. Nugent.............................................       1,850
John L. Schroeder.............................................       1,850
</TABLE>
 
    The following table illustrates the compensation paid to the Trust's
Independent Trustees for the calendar year ended December 31, 1997 for services
to the 84 Morgan Stanley Dean Witter Funds and, in the case of Messrs. Haire,
Johnson, Nugent and Schroeder, the 14 TCW/DW Funds that were in operation at
December 31, 1997. Mr. Haire serves as Chairman of the Audit Committee of each
Morgan Stanley Dean Witter Fund and each TCW/DW Fund and, prior to June 1, 1998,
also served as Chairman of the Independent Directors or Trustees of those Funds.
With respect to Messrs. Haire, Johnson, Nugent and Schroeder, the TCW/DW Funds
are included solely because of a limited exchange privilege between those Funds
and five Morgan Stanley Dean Witter Money Market Funds. Mr. Hedien's term as
Director or Trustee of each Morgan Stanley Dean Witter Fund commenced on
September 1, 1997.
 
    CASH COMPENSATION FROM MORGAN STANLEY DEAN WITTER FUNDS AND TCW/DW FUNDS
 
<TABLE>
<CAPTION>
                                                                   FOR SERVICE AS
                              FOR SERVICE AS                        CHAIRMAN OF      FOR SERVICE     TOTAL CASH
                               DIRECTOR OR                          INDEPENDENT          AS         COMPENSATION
                               TRUSTEE AND                         DIRECTORS/TRUSTEES  CHAIRMAN OF  FOR SERVICES
                             COMMITTEE MEMBER                        AND AUDIT       INDEPENDENT    TO 84 MORGAN
                                    OF           FOR SERVICE AS    COMMITTEES OF    TRUSTEES AND       STANLEY
                                84 MORGAN         TRUSTEE AND        84 MORGAN          AUDIT        DEAN WITTER
                                 STANLEY        COMMITTEE MEMBER      STANLEY       COMMITTEES OF     FUNDS AND
NAME OF                        DEAN WITTER             OF           DEAN WITTER       14 TCW/DW       14 TCW/DW
INDEPENDENT TRUSTEE               FUNDS         14 TCW/DW FUNDS        FUNDS            FUNDS           FUNDS
- ---------------------------  ----------------   ----------------   --------------   -------------   -------------
<S>                          <C>                <C>                <C>              <C>             <C>
Michael Bozic..............      $133,602           --                 --               --            $133,602
Edwin J. Garn..............       149,702           --                 --               --             149,702
John R. Haire..............       149,702           $73,725           $157,463        $ 25,350         406,240
Wayne E. Hedien............        39,010           --                 --               --              39,010
Dr. Manuel H. Johnson......       145,702            71,125            --               --             216,827
Michael E. Nugent..........       149,702            73,725            --               --             223,427
John L. Schroeder..........       149,702            73,725            --               --             223,427
</TABLE>
 
    As of the date of this Statement of Additional Information, 57 of the Morgan
Stanley Dean Witter Funds, including the Trust, have adopted a retirement
program under which an Independent Trustee who retires after serving for at
least five years (or such lesser period as may be determined by the Board) as an
Independent Director or Trustee of any Morgan Stanley Dean Witter Fund that has
adopted the retirement program (each such Fund referred to as an "Adopting Fund"
and each such Trustee referred to as an "Eligible Trustee") is entitled to
retirement payments upon reaching the eligible retirement age (normally, after
attaining age 72). Annual payments are based upon length of service. Currently,
upon retirement, each Eligible Trustee is entitled to receive from the Adopting
Fund, commencing as of his or her retirement date and continuing for the
remainder of his or her life, an annual retirement benefit (the "Regular
Benefit") equal to 29.41% of his or her Eligible Compensation plus 0.4901667% of
such Eligible Compensation for each full month of service as an Independent
Director or Trustee of any Adopting Fund in excess of five years up to a maximum
of 58.82% after ten years of service. The foregoing percentages may be changed
by the Board.(1) "Eligible Compensation" is one-fifth of the total
 
- ------------------------------
(1)  AN ELIGIBLE TRUSTEE MAY ELECT ALTERNATE PAYMENTS OF HIS OR HER RETIREMENT
     BENEFITS BASED UPON THE COMBINED LIFE EXPECTANCY OF SUCH ELIGIBLE TRUSTEE
     AND HIS OR HER SPOUSE ON THE DATE OF SUCH ELIGIBLE TRUSTEE'S RETIREMENT.
     THE AMOUNT ESTIMATED TO BE PAYABLE UNDER THIS METHOD, THROUGH THE REMAINDER
     OF THE LATER OF THE LIVES OF SUCH ELIGIBLE TRUSTEE AND SPOUSE, WILL BE THE
     ACTUARIAL EQUIVALENT OF THE REGULAR BENEFIT. IN ADDITION, THE ELIGIBLE
     TRUSTEE MAY ELECT THAT THE SURVIVING SPOUSE'S PERIODIC PAYMENT OF BENEFITS
     WILL BE EQUAL TO EITHER 50% OR 100% OF THE PREVIOUS PERIODIC AMOUNT, AN
     ELECTION THAT, RESPECTIVELY, INCREASES OR DECREASES THE PREVIOUS PERIODIC
     AMOUNT SO THAT THE RESULTING PAYMENTS WILL BE THE ACTUARIAL EQUIVALENT OF
     THE REGULAR BENEFIT.
 
24
<PAGE>
compensation earned by such Eligible Trustee for service to the Adopting Fund in
the five year period prior to the date of the Eligible Trustee's retirement.
Benefits under the retirement program are not secured or funded by the Adopting
Funds.
 
    The following table illustrates the retirement benefits accrued to the
Trust's Independent Trustees by the Fund for the fiscal year ended September 30,
1997 and by the 57 Morgan Stanley Dean Witter Funds (including the Fund) for the
year ended December 31, 1998, and the estimated retirement benefits for the
Fund's Independent Trustees, to commence upon their retirement, from the Trust
as of September 30, 1997 and from the 57 Morgan Stanley Dean Witter Funds as of
December 31, 1997.
 
  RETIREMENT BENEFITS FROM THE TRUST AND ALL MORGAN STANLEY DEAN WITTER FUNDS
 
<TABLE>
<CAPTION>
                                  FOR ALL ADOPTING FUNDS
                                ---------------------------
                                 ESTIMATED                                                ESTIMATED ANNUAL
                                  CREDITED                                                    BENEFITS
                                   YEARS        ESTIMATED      RETIREMENT BENEFITS       UPON RETIREMENT(2)
                                 OF SERVICE     PERCENTAGE     ACCRUED AS EXPENSES     ----------------------
                                     AT             OF        ----------------------    FROM
                                 RETIREMENT      ELIGIBLE     BY THE      BY ALL        THE       FROM ALL
NAME OF INDEPENDENT TRUSTEE     (MAXIMUM 10)   COMPENSATION   TRUST   ADOPTING FUNDS   TRUST   ADOPTING FUNDS
- ------------------------------  ------------   ------------   ------  --------------   ------  --------------
<S>                             <C>            <C>            <C>     <C>              <C>     <C>
Michael Bozic.................       10          58.82%       $  372     $20,499       $  925     $ 55,026
Edwin J. Garn.................       10          58.82           548      30,878          925       55,026
John R. Haire.................       10          58.82          (744)    (19,823)(3)    2,241      132,002
Wayne E. Hedien...............        9          50.00             0           0          794       46,772
Dr. Manuel H. Johnson.........       10          58.82           226      12,832          925       55,026
Michael E. Nugent.............       10          58.82           384      22,546          925       55,026
John L. Schroeder.............        8          49.02           716      39,350          771       46,123
</TABLE>
 
- ------------------------
(2)  BASED ON CURRENT LEVELS OF COMPENSATION. AMOUNT OF ANNUAL BENEFITS ALSO
     VARIES DEPENDING ON THE TRUSTEE'S ELECTIONS DESCRIBED IN FOOTNOTE (1)
     ABOVE.
 
(3)  THIS NUMBER REFLECTS THE EFFECT OF THE EXTENSION OF MR. HAIRE'S TERM AS
     DIRECTOR OR TRUSTEE UNTIL MAY 1, 1999.
 
    As of the date of this Statement of Additional Information, the aggregate
number of shares of beneficial interest of the Trust owned by the Trust's
officers and Trustees as a group was less than 1 percent of the Trust's shares
of beneficial interest outstanding.
 
INVESTMENT ADVISORY AGREEMENT
- --------------------------------------------------------------------------------
 
The Trust has retained the Investment Advisor to manage the Trust's assets,
including the placing of orders for the purchase and sale of portfolio
securities, pursuant to an Investment Advisory Agreement with MSDW Advisors (the
"Advisory Agreement"). See "The Trust and Its Advisor" for a detailed
description of the Advisory Agreement.
 
    The Investment Advisor obtains and evaluates such information and advice
relating to the economy, securities markets, and specific securities as it
considers necessary or useful to manage continuously the assets of the Trust in
a manner consistent with its investment objective and policies. The Trust's
Board of Trustees reviews the various services provided by the Investment
Advisor to ensure that the Trust's general investment policies and programs are
being properly carried out. Under the terms of the Advisory Agreement, the
Investment Advisor pays the salaries of all personnel, including officers of the
Trust, who are employees of the Investment Advisor.
 
    Expenses not expressly assumed by the Investment Advisor under the Advisory
Agreement will be paid by the Trust. The expenses borne by the Trust include,
but are not limited to: charges and expenses of any registrar, custodian, stock
transfer and dividend disbursing agent; brokerage commissions; taxes; engraving
and printing of share certificates; registration costs of the Trust's Shares in
this continuous offering under federal and state securities laws; all expenses
of shareholders' and Trustees' meetings and of preparing, printing and mailing
proxy statements and reports to shareholders; fees and travel expenses of
Trustees or members of any advisory board or committee who are not employees or
retired employees of the Investment Advisor or any corporate affiliate thereof;
all expenses incident to any dividend or distribution program; charges and
expenses of any outside service used for pricing of the Trust's investments;
fees and expenses of legal counsel, including counsel to the Trustees who are
not interested persons of the Trust or of the Investment Advisor (not including
compensation or expenses of attorneys who are employees of the Investment
Advisor) and independent accountants; membership dues of industry associations;
interest on Trust borrowings; fees and expenses incident to Trust borrowings;
postage; insurance premiums on property or personnel (including officers and
trustees) of the Trust which inure to its benefit; extraordinary expenses
(including, but not limited to, legal claims and liabilities and litigation
costs and any indemnification relating thereto); and all other costs of the
Trust's operation.
 
                                                                              25
<PAGE>
    As full compensation for the services furnished to the Trust, the Trust pays
MSDW Advisors pursuant to the Advisory Agreement, monthly compensation
calculated daily at an annual rate of 0.90% of average daily net assets on
assets of the Trust up to $500 million, at an annual rate of 0.85% of average
daily net assets on assets of the Trust exceeding $500 million up to $1.5
billion and at an annual rate of 0.825% of average daily net assets on assets of
the Trust exceeding $1.5 billion. The sum of this fee and the administration fee
is higher than that paid by most other investment companies. See "Administrator
and Administration Agreement." For the fiscal years ended September 30, 1995,
1996 and 1997, the Trust accrued to MSDW Advisors total compensation of
$3,526,906, $6,524,700 and $9,981,012, respectively.
 
    The Advisory Agreement provides that in the absence of willful misfeasance,
bad faith, gross negligence or reckless disregard of its obligations thereunder,
the Investment Advisor is not liable to the Trust or any of its shareholders for
any act or omission by the Investment Advisor or for any losses sustained by the
Trust or its shareholders. The Advisory Agreement in no way restricts the
Investment Advisor from acting as investment manager or advisor to others.
 
    The Advisory Agreement was initially approved by the Trustees on February
21, 1997 and by the shareholders of the Fund at a Special Meeting of
Shareholders held on May 20, 1997. The Advisory Agreement is substantially
identical to a prior investment advisory agreement which was initially approved
by the Trustees on December 23, 1992 and by the Trust's shareholders on February
25, 1993 (the "Prior Advisory Agreement"). The Advisory Agreement took effect on
May 31, 1997 upon the consummation of the merger of Dean Witter, Discover & Co.
with Morgan Stanley Group Inc. The Advisory Agreement may be terminated at any
time, without penalty, on 30 days' notice by the Trustees of the Trust, by the
holders of a majority, as defined in the 1940 Act, of the outstanding Shares of
the Trust, or by the Investment Advisor. The Advisory Agreement will
automatically terminate in the event of its assignment (as defined in the 1940
Act).
 
    Under its terms, the Advisory Agreement with MSDW Advisors had an initial
term ending April 30, 1999, and will continue from year to year thereafter,
provided continuance of the Advisory Agreement is approved at least annually by
the vote of the holders of a majority (as defined in the 1940 Act) of the
outstanding voting securities of the Trust, or by the Trustees of the Trust;
provided that in either event such continuance is approved annually by the vote
of a majority of the Trustees of the Trust who are not parties to the Advisory
Agreement or "interested persons" (as defined in the 1940 Act) of any such party
(the "Independent Trustees"), which vote must be cast in person at a meeting
called for the purpose of voting on such approval.
 
ADMINISTRATOR AND ADMINISTRATION AGREEMENT
- --------------------------------------------------------------------------------
 
On December 31, 1993, MSDW Advisors effected an internal reorganization pursuant
to which certain administrative activities previously performed by MSDW Advisors
would instead be performed by Morgan Stanley Dean Witter Services Company Inc.
(the "Administrator" or "MSDW Services"), a wholly-owned subsidiary of MSDW
Advisors. Accordingly, the Administration Agreement between MSDW Advisors and
the Trust was terminated and a new Administration Agreement between the
Administrator and the Trust was entered into. The foregoing internal
reorganization did not result in any change of the management of the Trust's
Administrator. The nature and scope of the administrative services being
provided to the Trust or any of the fees being paid by the Trust under the new
Administration Agreement are identical to those of the previous Agreement. The
term "Administrator" refers to MSDW Advisors prior to this reorganization and to
MSDW Services after December 31, 1993. Morgan Stanley Dean Witter Distributors
Inc., the Distributor of the Trust's shares, is an affiliate of MSDW Advisors
and MSDW Services and a wholly-owned subsidiary of MSDW.
 
    In an earlier internal reorganization which took place in January, 1993,
DWR's investment company-related operations, pursuant to which the
administration activities that had been performed by DWR's InterCapital Division
were assumed by the then new company, Morgan Stanley Dean Witter Advisors Inc.,
and the share distribution activities that had been performed by DWR were
assumed by a separate new company, Morgan Stanley Dean Witter Distributors Inc.
MSDW Advisors refers to the InterCapital Division of DWR prior to the internal
reorganization and to Morgan Stanley Dean Witter Advisors Inc. after the
reorganization. This internal reorganization did not result in a change of
management of the Administrator or Distributor.
 
    Under the terms of the Administration Agreement, the Administrator maintains
certain of the Trust's books and records and furnishes, at its own expense, such
office space, facilities, equipment, clerical help, and bookkeeping and certain
legal services as the Trust may reasonably require in the conduct of its
business, including the preparation of proxy statements and reports required to
be filed with federal and state securities commissions (except insofar as the
participation or assistance of independent accountants and attorneys is, in the
opinion of the Administrator, necessary or desirable). In addition, the
Administrator pays the salaries of all personnel, including officers of the
Trust who are employees of the Administrator. The Administrator also bears the
cost of telephone service, heat, light, power and other utilities provided to
the Trust.
 
    As full compensation for the services and facilities furnished to the Trust
and expenses of the Trust assumed by the Administrator, the Trust pays the
Administrator monthly compensation calculated daily by applying the annual rate
of 0.25%
 
26
<PAGE>
to the Trust's average daily net assets. The sum of this fee and the investment
advisory fee is higher than that paid by most other investment companies. See
"Investment Advisory Agreement." During the fiscal years ended September 30,
1995, 1996 and 1997, total accrued compensation amounted to $979,775, $1,845,500
and $2,862,062, respectively.
 
    The Administration Agreement provides that in the absence of willful
misfeasance, bad faith, gross negligence or reckless disregard of its
obligations thereunder, the Administrator is not liable to the Trust or any of
its shareholders for any act or omission by the Administrator or for any losses
sustained by the Trust or its shareholders. The Administration Agreement in no
way restricts the Administrator from acting as administrator or investment
manager or advisor to others.
 
    The Administration Agreement was initially approved by the Trustees on April
17, 1996, in connection with the reincorporation of MSDW Services in the State
of Delaware. The Administration Agreement is substantially identical to the
prior administration agreement, initially approved by the Trustees on October
10, 1989, by the Investment Advisor as the sole shareholder on November 20, 1989
and by the Trust's shareholders at a Meeting of Shareholders on June 19, 1991
(the "Prior Administration Agreement"). At their meeting held on October 30,
1992, the Trustees of the Trust including all the Trustees of the Trust who are
not parties to the Administration Agreement or "interested persons" (as defined
in the Act) of any such party (the "Independent Trustees"), approved the
assumption by MSDW Advisors of DWR's rights and duties under the Prior
Administration Agreement, which assumption took place upon the reorganization
described above. The Administration Agreement may be terminated at any time,
without penalty, on thirty days notice by the Trustees of the Trust, by the
holders of a majority, as defined in the 1940 Act, of the outstanding Shares of
the Trust, or by the Administrator. The Administration Agreement will
automatically terminate in the event of its assignment (as defined in the 1940
Act).
 
    Under its terms, the new Administration Agreement with MSDW Services had an
initial term ending April 30, 1997, and provides that it will continue from year
to year thereafter, provided continuance of the Administration Agreement is
approved at least annually by the vote of the holders of a majority (as defined
in the 1940 Act) of the outstanding voting securities of the Trust, or by the
Trustees of the Trust; provided that in either event such continuance is
approved annually by the vote of a majority of the Independent Trustees, which
vote must be cast in person at a meeting called for the purpose of voting on
such approval. At their meeting held on April 30, 1998, the Trust's Board of
Trustees, including all of the Independent Trustees, approved continuation of
the Administration Agreement until April 30, 1999.
 
PORTFOLIO TRANSACTIONS
- --------------------------------------------------------------------------------
 
Subject to the general supervision of the Board of Trustees, the Investment
Advisor is responsible for decisions to buy and sell interests in Senior Loans
and other securities and effect hedging transactions for the Trust, the
selection of brokers and dealers to effect the transactions, and the negotiation
of brokerage commissions, if any. With respect to interests in Senior Loans, the
Trust generally will engage in privately negotiated transactions for their
purchase or sale in which the Investment Advisor will negotiate on behalf of the
Trust. The Trust may be required to pay fees, or forgo a portion of interest and
any fees payable to the Trust, to the Selling Participant or the entity selling
an Assignment to the Trust. The Investment Advisor will determine the Lenders
and Selling Participants from whom the Trust will purchase Assignments and
Participations by considering their professional ability, level of service,
relationship with the Borrower, financial condition, credit standards and
quality of management. The secondary market for interests in Senior Loans is
relatively illiquid. Although the Trust intends generally to hold interests in
Senior Loans until maturity or prepayment of the Senior Loan, such illiquidity
may restrict the ability of the Investment Advisor to locate in a timely manner
persons willing to purchase the Trust's interests in Senior Loans at a fair
price should the Trust desire to sell such interests. See "Investment Objective
and Policies."
 
    With respect to portfolio securities other than Senior Loans, the Trust
expects that the primary market for the securities in which it intends to invest
will generally be the over-the-counter market. Such securities are generally
traded in the over-the-counter market on a "net" basis with dealers acting as
principal for their own accounts without charging a stated commission, although
the price of the security usually includes a profit to the dealer. The Trust
also expects that securities will be purchased at times in underwritten
offerings, where the price includes a fixed amount of compensation, generally
referred to as the underwriter's concession or discount. On occasion, the Trust
may also purchase certain money market instruments directly from an issuer, in
which case no commissions or discounts are paid. During the fiscal years ended
September 30, 1995, 1996 and 1997, the Trust did not pay any brokerage
commissions.
 
    The policy of the Trust regarding purchases and sales of Senior Loans and
securities and futures contracts for its portfolio is that primary consideration
will be given to obtaining the most favorable prices and efficient execution of
transactions. In seeking to implement the Trust's policies, the Investment
Advisor will effect transactions with those banks, brokers and dealers which the
Investment Advisor believes provide the most favorable prices and who are
capable of providing efficient executions. If the Investment Advisor believes
such price and execution are obtainable from more than one bank, broker or
dealer, it may give consideration to placing portfolio transactions with those
banks, brokers and dealers who also furnish research and other services to the
Trust or the Investment Advisor. Such services may include, but are not
 
                                                                              27
<PAGE>
limited to, any one or more of the following: information as to the availability
of securities for purchase or sale; statistical or factual information or
opinions pertaining to investment; wire services; and appraisals or evaluations
of portfolio securities.
 
    The information and services received by the Investment Advisor from banks,
brokers and dealers may be of benefit to the Investment Advisor and its
affiliates in the management of other accounts and may not in all cases benefit
the Trust directly. While the receipt of such information and services is useful
in varying degrees and would generally reduce the amount of research or services
otherwise performed by the Investment Advisor and thus reduce its expenses, it
is of indeterminable value and the advisory fee paid to the Investment Advisor
is not reduced by any amount that may be attributable to the value of such
services.
 
    Consistent with the policy described above, brokerage transactions in
securities listed on exchanges or admitted to unlisted trading privileges may be
effected through DWR, Morgan Stanley & Co. Incorporated ("MS & Co.") and other
affiliated brokers and dealers. In order for an affiliated broker or dealer to
effect any portfolio transactions for the Fund, the commissions, fees or other
remuneration received by the affiliated broker or dealer must be reasonable and
fair compared to the commissions, fees or other remuneration paid to other
brokers in connection with comparable transactions involving similar securities
being purchased or sold on an exchange during a comparable period of time. This
standard would allow the affiliated broker or dealer to receive no more than the
remuneration which would be expected to be received by an unaffiliated broker in
a commensurate arm's-length transaction. Furthermore, the Board of Trustees of
the Fund, including a majority of the Trustees who are not "interested" persons
of the Fund, as defined in the Act, have adopted procedures which are reasonably
designed to provide that any commissions, fees or other remuneration paid to an
affiliated broker or dealer are consistent with the foregoing standard.
 
DETERMINATION OF NET ASSET VALUE
- --------------------------------------------------------------------------------
 
The net asset value per share of the Trust's Shares is determined by calculating
the total value of the Trust's assets, deducting its total liabilities, and
dividing the result by the number of Shares outstanding. The net asset value
will be computed as of 4:00 p.m. New York time on each business day on which the
New York Stock Exchange is open for trading (or, on days when the New York Stock
Exchange closes prior to 4:00 p.m., at such earlier time). The Trust reserves
the right to calculate the net asset value more frequently if deemed desirable.
 
    Interests in Senior Loans held by the Trust are currently valued at their
fair value in accordance with procedures established in good faith by the Board
of Trustees of the Trust. Under the procedures adopted by the Board of Trustees,
interests in Senior Loans will be priced in accordance with a matrix which takes
into account the relationship between the then current interest rate and
interest rates payable on each Senior Loan, as well as the total number of days
in each interest period and the period remaining until next interest rate
determination or maturity of the Senior Loan. Adjustments in the
matrix-determined price of a Senior Loan are made in the event of a default on a
Senior Loan or a significant change in the creditworthiness of the Borrower and
may also be required in the event of changes in pricing parameters for newly
issued Senior Loans (e.g., interest rates are set at a higher or lower margin
above the base lending rate than were Senior Loans in the Trust's portfolio).
Loans purchased at a discount from par for reasons other than credit impairment
are valued at cost and the discount is amortized to maturity. In assessing the
creditworthiness of a Borrower, the primary focus is on the ability and intent
of the Borrower to continue to meet its principal and interest payment
obligations specified under the applicable Loan Agreement. Such factors as the
Borrower's current and projected cash flow relative to its debt service
requirements and liquidity are considered in this regard. S&P and Moody's
ratings of any outstanding commercial paper of a Borrower may also be
considered. The procedures are monitored by the Board of Trustees on an ongoing
basis to insure that the values arrived at continue to represent fair value.
Should the Board of Trustees determine that the market for Senior Loans has
developed to the point where market quotations provided by banks, dealers or
pricing services respecting interests in Senior Loans could reliably serve as a
basis for valuing the Trust's portfolio securities, such quotations would be
used as a basis for valuing interests in Senior Loans held by the Trust. Other
portfolio securities traded in the over-the-counter market will be valued based
upon closing bid prices; provided, however, that short-term securities with
remaining maturities of less than 60 days will be valued at amortized cost.
Other assets are valued at fair value in accordance with procedures established
in good faith by the Board of Trustees of the Trust.
 
DIVIDENDS AND DISTRIBUTIONS
- --------------------------------------------------------------------------------
 
It is the Trust's present policy, which may be changed by the Board of Trustees,
to declare daily and pay monthly dividends to shareholders from net investment
income of the Trust. Distributions to holders of Shares cannot be assured, and
the amount of each monthly distribution is expected to vary. The Trust intends
to distribute all of the Trust's net investment income on an annual basis. Net
investment income of the Trust consists of all interest income and fee and other
ordinary income earned by the Trust on its portfolio assets, less all expenses
of the Trust. The Trust will distribute its capital gains (after offset for any
 
28
<PAGE>
available loss carryovers), if any, at least once per year, but it may make such
distributions on a more frequent basis to comply with the distribution
requirements of the Tax Reform Act of 1986, as amended, but in all events in a
manner consistent with the 1940 Act.
 
    All dividends and capital gains distributions are reinvested automatically
in full and fractional Shares at the net asset value per Share determined on the
payable date of such dividend or distribution. A shareholder may, at any time,
by written notification to the Transfer Agent, elect to have subsequent
dividends or capital gains distributions, or both, paid in cash rather than
reinvested, in which event payment will be mailed on or about the payment date.
 
TAXATION
- --------------------------------------------------------------------------------
 
Because the Trust intends to distribute all of its net investment income and
capital gains to shareholders and intends to otherwise comply with all the
provisions of Subchapter M of the Internal Revenue Code of 1986 (the "Code"), it
is not expected that the Trust will be required to pay any federal income tax on
such income and capital gains. If, however, any such capital gains are retained,
the Trust will pay federal income tax thereon. In such a case, the Trust may
make an election pursuant to which shareholders would have to include such
retained gains in their income but would be able to claim their share of the tax
paid by the Trust as a credit against their individual federal income tax.
 
    Shareholders will normally have to pay federal income taxes, and any state
income taxes, on the dividends and distributions they receive from the Trust.
Such dividends and distributions derived from net investment income or short-
term capital gains are taxable to the shareholders as ordinary income regardless
of whether the shareholder receives such distributions in additional Shares or
in cash. It is not expected that any portion of such dividends and distributions
will be eligible for the corporate dividends received deduction.
 
    Long-term or short-term capital gains may be generated by the sale of
portfolio securities and by certain transactions in options and futures
contracts engaged in by the Trust. Distributions of long-term capital gains, if
any, are taxable to shareholders as long-term capital gains regardless of how
long a shareholder has held the Trust's shares and regardless of whether the
distribution is received in additional Shares or in cash. Capital gains
distributions are not eligible for the dividends-received deduction.
 
    Treasury intends to issue regulations to permit shareholders to take into
account their proportionate share of the Fund's capital gains distributions that
will be subject to a reduced rate under the Taxpayer Relief Act of 1997. The
Taxpayer Relief Act reduced the maximum tax rate on long-term capital gains from
28% to 20%; it also lengthened the required holding period to obtain this lower
rate from more than 12 months to more than 18 months. However, the IRS
Restructuring and Reform Act of 1998 reduces the holding period requirement for
the lower capital gain rate to mature 12 months for transactions occurring after
January 1, 1998. These lower rates do not apply to collectibles and certain
other assets. Additionally, the maximum capital gain rate for assets that are
held more than 5 years and that are acquired after December 31, 2000 is 18%.
 
    Any distribution in excess of the Trust's earnings and profits will first
reduce a shareholder's adjusted basis in his Shares to zero and, after such
basis is reduced to zero, will constitute gain to the shareholder from the sale
of Shares.
 
    A holder of Shares who either sells his Shares or, pursuant to a tender
offer, tenders all Shares owned by such shareholder and any Shares considered
owned by such shareholder under attribution rules contained in the Code will
realize a taxable gain or loss depending upon such shareholder's basis in the
Shares. Such gain or loss will generally be treated as capital gain or loss and
will be long-term capital gain or loss if the Shares are held for more than one
year. However, any loss on a sale or exchange of Shares held for six months or
less will be treated as long-term capital loss to the extent of any long-term
capital gain distribution with respect to such Shares.
 
    If a tendering holder of Shares tenders less than all Shares owned by or
attributed to such shareholder, and if the distribution to such shareholder does
not otherwise qualify as a payment in exchange for stock, the proceeds received
will be treated as a taxable dividend, return of capital or capital gain
depending on the Trust's earnings and profits and the shareholder's basis in the
tendered Shares. Also, if some tendering holders of Shares receive taxable
dividends, there is a risk that non-tendering holders of Shares may be
considered to have received a deemed distribution which may be a taxable
dividend in whole or in part.
 
    The Code requires each regulated investment company to pay a nondeductible
4% excise tax to the extent the company does not distribute, during each
calendar year, 98% of its ordinary income, determined on a calendar year basis,
and 98% of its capital gains, determined, in general, on an October 31 year end,
plus certain undistributed amounts from previous years. The Trust anticipates
that it will make sufficient timely distributions to avoid imposition of the
excise tax. If the Trust pays a dividend in January which was declared in the
previous calendar quarter to shareholders of record on a date in such calendar
quarter, then such dividend or distribution will be treated for tax purposes as
being paid in December and will be taxable to shareholders as if received in
December.
 
                                                                              29
<PAGE>
    Any dividend or capital gains distribution received by a shareholder from an
investment company will have the effect of reducing the net asset value of the
shareholder's stock in that company by the exact amount of the dividend or
capital gains distribution. Furthermore, capital gains distributions and
dividends are subject to federal income taxes. If the net asset value of the
shares should be reduced below a shareholder's cost as a result of the
distribution of realized long-term capital gains, such distribution would be in
part a return of the shareholder's investment to the extent of such reduction
below the shareholder's cost, but nonetheless would be taxable to the
shareholder. Therefore, an investor should consider the tax implications of
purchasing Shares immediately prior to a distribution record date.
 
    The tax treatment of listed put and call options written or purchased by the
Trust on debt securities and of futures contracts entered into by the Trust will
generally be governed by Section 1256 of the Code, pursuant to which each such
position held by the Trust will be marked-to-market (i.e., treated as if it were
sold for fair market value) on the last business day of each taxable year of the
Trust, and all gain or loss associated with transactions in such positions will
be treated as 60% long-term capital gain or loss and 40% short-term capital gain
or loss. Positions of the Trust which consist of at least one debt security and
at least one option or futures contract which substantially diminishes the
Trust's risk of loss with respect to such debt security could be treated as
"mixed straddles" which are subject to the straddle rules of Section 1092 of the
Code, the operation of which may cause deferral of losses, adjustments in the
holding periods of debt securities and conversion of short-term capital losses
into long-term capital losses. Certain tax elections exist for mixed straddles
which reduce or eliminate the operation of the straddle rules. The Trust will
monitor its transactions in options and futures contracts and may make certain
tax elections in order to mitigate the effect of these rules and prevent
disqualification of the Trust as a regulated investment company under Subchapter
M of the Code. Such tax elections may result in an increase in distributions of
ordinary income (relative to long-term capital gain) to shareholders.
 
    The federal income tax treatment of interest rate swaps is not entirely
clear. The Trust may be required to treat payments received under such
arrangements as ordinary income and to amortize such payments under certain
circumstances. The Trust will limit its activity in this regard in order to
maintain its qualification as a regulated investment company.
 
    The Fund may at times make payments from sources other than income or net
capital gains. Payments from such sources will in effect, represent a return of
a portion of each shareholder's investment. All, or a portion, of such payments
will not be taxable to shareholders.
 
    After the end of each calendar year, shareholders will receive full
information on their dividends and capital gains distributions for tax purposes.
Shareholders will also be notified of their proportionate share of long-term
capital gains distributions that are eligible for a reduced rate of tax under
the Taxpayer Relief Act of 1997. Shareholders who receive distributions of
Shares which are automatically reinvested will generally be viewed as receiving
a distribution equal to the fair market value of such Shares.
 
    To avoid being subject to a 31% federal backup withholding tax on taxable
dividends, capital gains distributions and the proceeds of redemptions and
repurchases, shareholders' taxpayer identification numbers must be furnished and
certified as to their accuracy.
 
    Ordinary income dividends and distributions paid by the Trust to
shareholders who are non-resident aliens will be subject to a 30% United States
withholding tax under existing provisions of the Code applicable to foreign
individuals and entities unless a reduced rate of withholding or a withholding
exemption is provided under applicable treaty law. Non-resident shareholders are
urged to consult their own tax advisors concerning the applicability of the
United States withholding tax.
 
    The above discussion is only a brief summary of some of the significant tax
consequences of investing in the Trust. Shareholders should consult their tax
advisors regarding specific questions as to state or local taxes and as to the
applicability of the foregoing to their current federal tax situation.
 
DESCRIPTION OF SHARES
- --------------------------------------------------------------------------------
 
GENERAL
 
The Trust's Declaration of Trust permits the Trustees to issue an unlimited
number of full and fractional shares of beneficial interest, of $.01 par value
("Shares"). Share certificates will be issued to the holder of record of Shares
upon request. Currently, Shares will be required to be held of record by the
investor. The investor's broker may not be reflected as the record holder;
however, arrangements for Shares to be held in "street name" may be implemented
in the future.
 
    Shareholders are entitled to one vote for each Share held and to vote on
matters submitted to meetings of shareholders. No material amendment may be made
to the Trust's Declaration of Trust without the affirmative vote of at least a
majority of its Shares represented in person or by proxy at a meeting at which a
quorum is present or by written consent without a
 
30
<PAGE>
meeting. Under certain circumstances the Trustees may be removed by action of
the Trustees. The shareholders also have the right under certain circumstances
to remove the Trustees. Shares have no preemptive or conversion rights and when
issued are fully paid and non-assessable.
 
    The Trust's Declaration of Trust permits the Trustees to divide or combine
the Shares into a greater or lesser number of Shares without thereby changing
the proportionate beneficial interests in the Trust. Each Share represents an
equal proportionate interest in the Trust with each other Share.
 
    The Trust may be terminated (i) by the affirmative vote of the holders of
66% of its outstanding Shares or (ii) by an instrument signed by a majority of
the Trustees and consented to by the holders of two-thirds of the Trust's
outstanding Shares. Upon termination of the Trust, the Trustees will wind up the
affairs of the Trust, the Trust's business will be liquidated and the Trust's
net assets will be distributed to the Trust's shareholders on a pro rata basis.
If not so terminated, the Trust will continue indefinitely.
 
    The Trust is an entity of the type commonly known as a "Massachusetts
business trust." Under Massachusetts law, shareholders of such a trust may,
under certain circumstances, be held personally liable as partners for its
obligations. However, the Declaration of Trust contains an express disclaimer of
shareholder liability for acts or obligations of the Trust, requires that Trust
documents include such disclaimer, and provides for indemnification and
reimbursement of expenses out of the Trust's property for any shareholder held
personally liable for the obligations of the Trust. Thus, the risk of a
shareholder incurring financial loss on account of shareholder liability is
limited to circumstances in which the Trust itself would be unable to meet its
obligations. Given the nature of the Trust's assets and operations, the
possibility of the Trust being unable to meet its obligations is remote. Given
the above limitations on shareholders' personal liability and the Trust's
ability to meet its indemnification obligations, in the opinion of Massachusetts
counsel to the Trust, the risk to Trust shareholders of personal liability is
remote.
 
    The Declaration of Trust further provides that obligations of the Trust are
not binding upon the Trustees individually but only upon the property of the
Trust. Accordingly, the Trustees will not be liable for errors of judgment or
mistakes of fact or law, but nothing in the Declaration of Trust protects a
Trustee against any liability to which he would otherwise be subject by reason
of willful misfeasance, bad faith, gross negligence, or reckless disregard of
the duties involved in the conduct of his office.
 
ANTI-TAKEOVER PROVISIONS
 
The Trust presently has certain anti-takeover provisions in its Declaration of
Trust which could have the effect of limiting the ability of other entities or
persons to acquire control of the Trust, to cause it to engage in certain
transactions or to modify its structure. A Trustee may be removed from office by
a written instrument signed by at least two-thirds of the remaining trustees or
by a vote of the holders of at least 66% of the Shares. In addition, the
affirmative vote or consent of the holders of 66% of the Shares of the Trust (a
greater vote than that required by the 1940 Act and greater than the required
vote applicable to business corporations under state law) is required to
authorize the conversion of the Trust from a closed-end to an open-end
investment company, or generally to authorize any of the following transactions:
 
         (i) merger or consolidation of the Trust with or into any other
    corporation, association, trust or other organization;
 
        (ii) issuance of any securities of the Trust to any person or entity for
    cash;
 
        (iii) sale, lease or exchange of all or any substantial part of the
    assets of the Trust, to any entity or person (except assets having an
    aggregate fair market value of less than $1,000,000, aggregating similar
    transactions over a twelve-month period); or
 
        (iv) sale, lease or exchange to the Trust, in exchange for securities of
    the Trust, of any assets of any entity or person (except assets having an
    aggregate fair market value of less than $1,000,000, aggregating similar
    transactions over a twelve-month period)
 
if such corporation, person or entity is directly, or indirectly through
affiliates, the beneficial owner of 5% or more of the outstanding shares of the
Trust. However, such 66% vote or consent will not be required with respect to
the foregoing transactions where the Board of Trustees under certain conditions
approves the transaction, in which case, with respect to (i) and (iii) above, a
majority shareholder vote or consent will be required, and, with respect to (ii)
and (iv) above, a shareholder vote or consent would be required. Furthermore,
any amendment to the provisions in the Declaration of Trust requiring a 66%
shareholder vote or consent for the foregoing transactions similarly requires a
66% shareholder vote or consent.
 
    The foregoing provisions will make more difficult a change in the Trust's
management, or consummation of the foregoing transactions without the Trustee's
approval, and would, in the event a secondary market were to develop in the
 
                                                                              31
<PAGE>
Shares, have the effect of depriving shareholders of an opportunity to sell
their shares at a premium over prevailing market prices by discouraging a third
party from seeking to obtain control of the Trust in a tender offer or similar
transaction. However, the Board of Trustees has considered these anti-takeover
provisions and believes that they are in the shareholders' best interests and
benefit shareholders by providing the advantage of potentially requiring persons
seeking control of the Trust to negotiate with its management regarding the
price to be paid and facilitating the continuity of the Trust's management.
Reference should be made to the Declaration of Trust on file with the SEC for
the full text of these provisions. See "Further Information."
 
SHARE REPURCHASES AND TENDERS
- --------------------------------------------------------------------------------
 
The Board of Trustees of the Trust currently intends, each quarter, to consider
authorizing the Trust to make tender offers for all or a portion of its then
outstanding Shares at the then current net asset value of the Shares. Although
such tender offers, if undertaken and completed, will provide some liquidity for
holders of the Shares, there can be no assurance that such tender offers will in
fact be undertaken, completed or, if completed, that they will provide
sufficient liquidity for all holders of Shares who may desire to sell such
Shares. As such, investment in the Shares should be considered illiquid.
 
    Although the Board of Trustees believes that tender offers for the Shares
generally would increase the liquidity of the Shares, the acquisition of Shares
by the Trust will decrease the total assets of the Trust, and therefore, have
the effect of increasing the Trust's expense ratio. Because of the nature of the
Trust's investment objective and policies and the Trust's portfolio, the
Investment Advisor anticipates potential difficulty in disposing of portfolio
securities in order to consummate tender offers for the Shares. As a result, the
Trust may be required to borrow money in order to finance repurchases and
tenders. The Trust's Declaration of Trust authorizes the Trust to borrow money
for such purposes.
 
    Even if a tender offer has been made, the Trustees' announced policy, which
may be changed by the Trustees, is that the Trust cannot accept tenders if (1)
such transactions, if consummated, would (a) impair the Trust's status as a
regulated investment company under the Code (which would make the Trust a
taxable entity, causing the Trust's taxable income to be taxed at the Trust
level) or (b) result in a failure to comply with applicable asset coverage
requirements or (2) there is, in the judgment of the Trustees, any (a) material
legal action or proceeding instituted or threatened challenging such
transactions or otherwise materially adversely affecting the Trust, (b)
suspension of or limitation on prices for trading securities generally on the
New York Stock Exchange, (c) declaration of a banking moratorium by federal or
state authorities or any suspension of payment by banks in the United States or
New York State, (d) limitation affecting the Trust or the issuers of its
portfolio securities imposed by federal or state authorities on the extension of
credit by lending institutions, (e) commencement of war, armed hostilities or
other international or national calamity directly or indirectly involving the
United States or (f) other event or condition which would have a material
adverse effect on the Trust or the holders of its Shares if Shares were
repurchased. The Trustees may modify these conditions in light of experience.
 
    Any tender offer made by the Trust for its Shares will be at a price equal
to the net asset value of the Shares determined at the close of business on the
day the offer ends. During the pendency of any tender offer by the Trust, the
Trust will establish procedures which will be specified in the tender offer
documents to enable holders of Shares to ascertain readily such net asset value.
Each offer will be made and holders of Shares notified in accordance with the
requirements of the 1934 Act and the 1940 Act, either by publication or mailing
or both. Each offering document will contain such information as is prescribed
by such laws and the rules and regulations promulgated thereunder. If any tender
offer, after consideration and approval by the Trustees, is undertaken by the
Trust, the terms of such tender offer will set forth the maximum number of
Shares (if less than all) that the Trust is willing to purchase pursuant to the
tender offer. The Trust will purchase, subject to such maximum number of Shares
tendered in accordance with the terms of the offer, all Shares tendered unless
it determines to accept none of them. In the event that a number of Shares in
excess of such maximum number of outstanding Shares are tendered in accordance
with the Trust's tender offer, the Trust intends to purchase, on a pro rata
basis, an amount of tendered Shares equal to such maximum number of the
outstanding Shares or, alternatively, to extend the offering period and increase
the number of Shares that the Trust is offering to purchase. The Trust will pay
all costs and expenses associated with the making of any tender offer.
 
    During the fiscal year October 1, 1996 through September 30, 1997, the Trust
completed four tender offers. The first tender offer commenced on December 20,
1996 and resulted in the tender of 1,890,054 Shares. The second tender offer
commenced on March 14, 1997 and resulted in the tender of 2,035,269 Shares. The
third tender offer commenced on May 12, 1997 and resulted in the tender of
1,946,138 Shares. The fourth tender offer commenced on August 20, 1997 and
resulted in the tender of 2,779,048 shares.
 
    If the Trust must liquidate portfolio holdings in order to purchase Shares
tendered, the Trust may realize gains and losses.
 
32
<PAGE>
EARLY WITHDRAWAL CHARGE
 
Any early withdrawal charge to defray distribution expenses will be charged in
connection with Shares held for four years or less which are accepted by the
Trust for repurchase pursuant to tender offers, except as noted below. The early
withdrawal charge will be imposed on a number of Shares accepted for tender the
value of which exceeds the aggregate value at the time the tender is accepted of
(a) all Shares in the account purchased more than four years prior to such
acceptance, (b) all Shares in the account acquired through reinvestment of
dividends and distributions, and (c) the increase, if any, of value of all other
Shares in the account (namely those purchased within the four years preceding
the acceptance) over the purchase price of such Shares. Accordingly, the early
withdrawal charge is not imposed on Shares acquired through reinvestment of
dividends and distributions or on any increases in the net asset value of Shares
above the initial purchase price. The early withdrawal charge will be paid to
the Investment Advisor. In determining whether an early withdrawal charge is
payable, it is assumed that the acceptance of a repurchase offer would be made
from the earliest purchase of Shares. Any early withdrawal charge which is
required to be imposed will be made in accordance with the following schedule.
 
<TABLE>
<CAPTION>
                                    EARLY
YEAR OF REPURCHASE                WITHDRAWAL
  AFTER PURCHASE                    CHARGE
- -------------------------------  ------------
<S>                              <C>
First..........................      3.0%
Second.........................      2.5%
Third..........................      2.0%
Fourth.........................      1.0%
Fifth and following............      0.0%
</TABLE>
 
    The following example will illustrate the operation of the early withdrawal
charge. Assume that an investor purchases $1,000 of the Trust's Shares for cash
and that 21 months later the value of the account has grown through the
reinvestment of dividends and capital appreciation to $1,200. The investor then
may submit for repurchase pursuant to a tender offer up to $200 of Shares
without incurring an early withdrawal charge. If the investor should submit for
repurchase pursuant to a tender offer $500 of Shares, an early withdrawal charge
would be imposed on $300 of the Shares submitted. The charge would be imposed at
the rate of 2.5% because it is in the second year after the purchase was made,
and the charge would be $7.50. For the fiscal years ended September 30, 1995,
1996 and 1997, InterCapital informed the Trust that it received approximately
$219,000, $728,000 and $1,296,000, respectively, in withdrawal fees.
 
PURCHASE OF SHARES
- --------------------------------------------------------------------------------
 
The Trust continuously offers Shares through Morgan Stanley Dean Witter
Distributors Inc., which is acting as the distributor of the Shares, through
certain broker-dealers, including Dean Witter Reynolds Inc. ("DWR"), which have
entered into selected dealer agreements with the Distributor ("Selected
Broker-Dealers"). The Trust or the Distributor may suspend the continuous
offering of the Shares to the general public at any time in response to
conditions in the securities markets or otherwise and may thereafter resume such
offering from time to time.
 
    Morgan Stanley Dean Witter Distributors Inc. serves as distributor of the
Trust's shares pursuant to a Distribution Agreement initially approved by the
Trustees on October 30, 1992. The Distribution Agreement had an initial term
ending April 30, 1994, and provides under its terms that it will continue from
year to year thereafter if approved by the Board. At their meeting held on April
30, 1998, the Trustees, including all of the Independent Trustees, approved the
continuation of the Distribution Agreement until April 30, 1999.
 
    None of the Trust, the Distributor or the Investment Advisor intends to make
a secondary market in the Shares. Accordingly, there is not expected to be any
secondary trading market in the Shares, and an investment in the Shares should
be considered illiquid.
 
    The minimum investment in the Trust is $1,000. Subsequent purchases of $100
or more may be made by sending a check, payable to Morgan Stanley Dean Witter
Prime Income Trust, directly to Morgan Stanley Dean Witter Trust FSB, an
affiliate of the Distributor (the "Transfer Agent") at P.O. Box 1040, Jersey
City, New Jersey 07303 or by contacting a Financial Advisor of DWR or other
Selected Broker-Dealer representative. Certificates for Shares purchased will
not be issued unless a request is made by the shareholder in writing to the
Transfer Agent.
 
    Shares of the Trust are sold through Morgan Stanley Dean Witter Distributors
Inc. or a Selected Broker-Dealer on a normal three business day settlement
basis; that is, payment generally is due on or before the third business day
(settlement date) after the order is placed with the Distributor. Shares of the
Trust purchased through the Distributor or a Selected Broker-Dealer are entitled
to dividends beginning on the next business day following settlement date. Since
the Distributor
 
                                                                              33
<PAGE>
or a Selected Broker-Dealer forwards investors' funds on settlement date, they
may benefit from the temporary use of the funds where payment is made prior
thereto.
 
    The Shares are offered by the Trust at the then current net asset value per
share next computed after the Distributor receives an order to purchase from an
investor's dealer or directly from the investor. See "Determination of Net Asset
Value." The Investment Advisor compensates the Distributor at a rate of 2.75% of
the purchase price of Shares purchased from the Trust. The Distributor may
reallow to dealers 2.5% of the purchase price of Shares of the Trust purchased
by such dealers. If such Shares remain outstanding after one year from the date
of their initial purchase, the Investment Advisor currently intends to
compensate the Distributor at an annual rate equal to 0.10% of the net asset
value of the Shares sold and remaining outstanding. Such 0.10% fee will begin
accruing after one year from the date of the initial purchase of the Shares. The
compensation to the Distributor described above is paid by the Investment
Advisor from its own assets, which may include profits from the advisory fee
payable under the Advisory Agreement, as well as borrowed funds. An early
withdrawal charge payable to the Investment Advisor of up to 3.0% of the
original purchase price of the Shares will be imposed on most Shares held for
four years or less that are accepted for repurchase pursuant to a tender offer
by the Trust. See "Share Repurchases and Tenders." The compensation paid to the
Distributor, including compensation paid in connection with the purchase of
Shares from the Trust, the annual payments referred to above and the early
withdrawal charge, if any, described above, will not in the aggregate exceed the
applicable limit (currently 7.25%) as determined from time to time by the
National Association of Securities Dealers, Inc.
 
YIELD INFORMATION
- --------------------------------------------------------------------------------
 
The Trust may, from time to time, publish its yield. The yield on Trust Shares
normally will fluctuate. Therefore, the yield for any given past period is not
an indication or representation by the Trust of future yields or rates of return
on its Shares. The Trust's yield is affected by changes in prevailing interest
rates, average portfolio maturity and operating expenses. Current yield
information may not provide a basis for comparison with bank deposits or other
investments which pay a fixed yield over a stated period of time.
 
    The yield of the Trust is computed by dividing the Trust's net investment
income over a 30-day period by an average value (using the average number of
Shares entitled to receive dividends and the net asset value per Share at the
end of the period), all in accordance with the standardized yield formula
prescribed by the SEC for open-end investment companies. Such amount is
compounded for six months and then annualized for a twelve-month period to
derive the Trust's yield. For the 30-day period ended September 30, 1997, the
Trust's yield, calculated pursuant to this formula, was 6.99%.
 
    On occasion, the Trust may compare its yield to (i) the Prime Rate, quoted
daily in THE WALL STREET JOURNAL as the base rate on corporate loans at large
U.S. money center commercial banks, (ii) one or more averages compiled by
DONOGHUE'S MONEY FUND REPORT, a widely recognized independent publication that
monitors the performance of money market mutual funds, (iii) the average yield
reported by the BANK RATE MONITOR NATIONAL INDEX for money market deposit
accounts offered by the 100 leading banks and thrift institutions in the ten
largest standard metropolitan statistical areas, (iv) yield data published by
Lipper Analytical Services, Inc., or (v) the yield on an investment in 90-day
Treasury bills on a rolling basis, assuming quarterly compounding. In addition,
the Trust may compare the Prime Rate, the DONOGHUE'S averages and the other
yield data described above to each other. As with yield quotations, yield
comparisons should not be considered representative of the Trust's yield or
relative performance for any future period.
 
CUSTODIAN, DIVIDEND DISBURSING AND TRANSFER AGENT
- --------------------------------------------------------------------------------
 
The Bank of New York, 90 Washington Street, New York, New York 10286, is the
Trust's custodian and has custody of all securities and cash of the Trust. The
custodian, among other things, attends to the collection of principal and income
and payment for collection of proceeds of securities bought and sold by the
Trust. Any of the Trust's cash balances with the Custodian in excess of $100,000
are unprotected by federal deposit insurance. Such balances may, at times, be
substantial.
 
    Morgan Stanley Dean Witter Trust FSB, Harborside Financial Center, Plaza
Two, Jersey City, New Jersey 07311, an affiliate of Morgan Stanley Dean Witter
Advisors Inc., the Trust's Investment Advisor, Morgan Stanley Dean Witter
Services Company Inc., the Trust's Administrator and Morgan Stanley Dean Witter
Distributors Inc. ("MSDW Distributors"), the Trust's Distributor, is the
dividend disbursing and transfer agent of the Trust. Morgan Stanley Dean Witter
Trust FSB charges the Trust an annual per shareholder account fee.
 
34
<PAGE>
REPORTS TO SHAREHOLDERS
- --------------------------------------------------------------------------------
 
The Trust will send to shareholders semi-annual reports showing the Trust's
portfolio and other information. An annual report, containing financial
statements audited by independent accountants, together with their report
thereon, will be sent to shareholders each year.
 
LEGAL COUNSEL
- --------------------------------------------------------------------------------
 
Barry Fink, Esq., who is an officer and the General Counsel of the Investment
Advisor, is an officer and the General Counsel of the Trust.
 
EXPERTS
- --------------------------------------------------------------------------------
 
The September 30, 1997 financial statements of the Trust, included herein, have
been so included in reliance upon the report of PricewaterhouseCoopers LLP,
independent accountants, given on the authority of said firm as experts in
auditing and accounting.
 
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
CODE OF ETHICS
 
Directors, officers and employees of MSDW Advisors, MSDW Services and MSDW
Distributors are subject to a strict Code of Ethics adopted by those companies.
The Code of Ethics is intended to ensure that the interests of shareholders and
other clients are placed ahead of any personal interest, that no undue personal
benefit is obtained from a person's employment activities and that actual and
potential conflicts of interest are avoided. To achieve these goals and comply
with regulatory requirements, the Code of Ethics requires, among other things,
that personal securities transactions by employees of the companies be subject
to an advance clearance process to monitor that no Morgan Stanley Dean Witter
Fund is engaged at the same time in a purchase or sale of the same security. The
Code of Ethics bans the purchase of securities in an initial public offering,
and also prohibits engaging in futures and options transactions and profiting on
short-term trading (that is, a purchase within sixty days of a sale or a sales
within sixty days of a purchase) of a security. In addition, investment
personnel may not purchase or sell a security for their personal account within
thirty days before or after any transaction in any Morgan Stanley Dean Witter
Fund managed by them. Any violations of the Code of Ethics are subject to
sanctions, including reprimand, demotion or suspension or termination of
employment. The Code of Ethics comports with regulatory requirements and the
recommendations in the 1994 report by the Investment Company Institute Advisory
Group on Personal Investing.
 
SHAREHOLDER INQUIRIES
 
All inquiries regarding the Trust should be directed to the Trust at the
telephone number or address set forth on the front cover of this Prospectus.
 
    This Prospectus does not contain all of the information set forth in the
Registration Statement that the Trust has filed with the SEC. The complete
Registration Statement may be obtained from the SEC upon payment of the fee
prescribed by the Rules and Regulations of the SEC.
 
                                                                              35
<PAGE>
PRIME INCOME TRUST
REPORT OF INDEPENDENT ACCOUNTANTS
- --------------------------------------------------------------------------------
 
To the Shareholders and Trustees of Prime Income Trust
 
    In our opinion, the accompanying statement of assets and liabilities,
including the portfolio of investments, and the related statements of
operations, of changes in net assets and of cash flows and the financial
highlights present fairly, in all material respects, the financial position of
Prime Income Trust (the "Trust") at September 30, 1997, the results of its
operations and its cash flows for the year then ended, the changes in its net
assets for each of the two years in the period then ended and the financial
highlights for each of the seven years in the period then ended and for the
period November 30, 1989 (commencement of operations) through September 30,
1990, in conformity with generally accepted accounting principles. These
financial statements and financial highlights (hereafter referred to as
"financial statements") are the responsibility of the Trust's management; our
responsibility is to express an opinion on these financial statements based on
our audits. We conducted our audits of these financial statements in accordance
with generally accepted auditing standards which require that we plan and
perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements, assessing the accounting principles used and significant estimates
made by management, and evaluating the overall financial statement presentation.
We believe that our audits, which included confirmation of securities at
September 30, 1997 by correspondence with the custodian and, with respect to
senior collateralized loans, the selling participants and agent banks, provide a
reasonable basis for the opinion expressed above.
 
    As explained in Note 1, the financial statements include senior
collateralized loans valued at $1,140,452,162 (85 percent of net assets), which
values have been estimated by the Trustees in the absence of readily
ascertainable market values. Those estimated values may differ significantly
from the values that would have been used had a ready market for the senior
collateralized loans existed, and the differences could be material.
 
PRICE WATERHOUSE LLP
1177 Avenue of the Americas
New York, New York 10036
November 12, 1997
 
36
<PAGE>
PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1997
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
 PRINCIPAL             DESCRIPTION
AMOUNT (IN                 AND                      COUPON
THOUSANDS)            MATURITY DATE                  RATE             VALUE
- -----------  --------------------------------  -----------------   ------------
<C>          <S>                               <C>                 <C>
SENIOR COLLATERALIZED TERM LOANS (a) (84.8%)
 
             ADVERTISING (0.9%)
$   12,000   Outdoor Systems, Inc., due
             06/30/04........................        7.53      %   $ 11,999,880
                                                                   ------------
 
             AEROSPACE (1.5%)
     3,885   Fairchild Holding Corp., due
             07/28/00........................        8.91             3,884,882
     5,060   The Aerostructures Corp., due
             09/30/03........................        8.81             5,060,000
     1,840   The Aerostructures Corp., due
             09/30/04........................        9.06             1,839,982
     9,900   Tri-Star Aerospace Co., due
             09/30/03........................        9.00             9,900,396
                                                                   ------------
                                                                     20,685,260
                                                                   ------------
 
             AIR FREIGHT (1.8%)
     9,000   Atlas Freighter Leasing II,
             Inc., due 05/29/04..............        7.97             8,999,820
     5,213   Evergreen International
             Aviation, Inc., due 05/31/02....        8.66             5,212,448
     9,775   First Security Bank, National
             Association as Owner Trustee,
             due 05/07/03....................        8.72             9,774,120
                                                                   ------------
                                                                     23,986,388
                                                                   ------------
 
             AIRCRAFT & AEROSPACE (0.6%)
     8,706   Erickson Air-Crane Co. L.L.C.,
             due 12/31/04....................        9.16             8,706,163
                                                                   ------------
 
             APPAREL (0.6%)
     4,475   Hosiery Corporation of America,
             Inc., due 07/31/01..............    8.94 to 9.13         4,472,328
       457   London Fog Industries, Inc. (b),
             due 05/31/02....................        0.00               434,531
     2,823   London Fog Industries, Inc., due
             05/31/02........................        9.50      +      2,681,831
       581   London Fog Industries, Inc., due
             05/31/02........................        12.50     ++       551,691
                                                                   ------------
                                                                      8,140,381
                                                                   ------------
 
             AUTO PARTS (0.7%)
     4,903   Hayes Wheels International,
             Inc., due 07/31/04..............    8.47 to 8.50         4,902,987
     3,974   Hayes Wheels International,
             Inc., due 07/31/05..............    8.72 to 8.75         3,973,751
                                                                   ------------
                                                                      8,876,738
                                                                   ------------
 
             AUTO PARTS - AFTER MARKET (1.6%)
    20,895   CSK Auto, Inc., due 10/31/03....        8.69            20,895,000
                                                                   ------------
 
             BEVERAGES - SOFT DRINKS (0.7%)
     3,880   Select Beverages, Inc., due
             06/30/01........................    8.94 to 9.19         3,880,200
     5,820   Select Beverages, Inc., due
             06/30/02........................    9.19 to 9.38         5,819,419
                                                                   ------------
                                                                      9,699,619
                                                                   ------------
 
             BREWERS (1.7%)
     4,922   The Stroh Brewery, Co., due
             06/30/01........................        8.25             4,922,039
     3,200   The Stroh Brewery, Co.
             (Revolver), due 06/30/01........    8.19 to 10.00        3,200,052
    14,211   The Stroh Brewery, Co., due
             06/30/03........................    8.69 to 8.75        14,210,630
                                                                   ------------
                                                                     22,332,721
                                                                   ------------
 
             BROADCAST MEDIA (1.7%)
     2,972   Benedek Broadcasting Corp., due
             05/01/01........................        10.13            2,972,361
     3,267   Benedek Broadcasting Corp., due
             11/01/02........................        10.63            3,267,568
     6,400   Chancellor Media Corp., due
             06/30/05........................        6.09             6,399,851
     1,949   Chancellor Media Corp.
             (Revolver), due 06/30/05........    6.09 to 8.50         1,949,483
     8,614   River City Broadcasting, L.P.,
             due 12/31/99....................        10.25            8,614,433
                                                                   ------------
                                                                     23,203,696
                                                                   ------------
 
             BUILDING MATERIALS (1.7%)
    10,000   Falcon Buildings Products, Inc.,
             due 06/30/05....................        8.66             9,999,900
    12,437   National Gypsum Co., due
             09/20/03........................    7.91 to 9.75        12,436,880
                                                                   ------------
                                                                     22,436,780
                                                                   ------------
</TABLE>
 
                                                                              37
<PAGE>
PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1997 (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 PRINCIPAL             DESCRIPTION
AMOUNT (IN                 AND                      COUPON
THOUSANDS)            MATURITY DATE                  RATE             VALUE
- -----------  --------------------------------  -----------------   ------------
<C>          <S>                               <C>                 <C>
             CABLE/CELLULAR (5.7%)
$    5,955   Cable Systems International,
             Inc., due 12/31/02..............        8.79      %   $  5,954,939
    10,000   Charter Communications
             Entertainment I, L.P., due
             12/31/04........................        8.44             9,999,400
     9,238   Mobilemedia Communication Corp.,
             due 06/30/02....................        8.22             8,221,808
     1,821   Mobilemedia Communication Corp.
             (Revolver), due 06/30/02........    8.22 to 8.29         1,620,294
     2,500   Mobilemedia Communication Corp.,
             due 06/30/03....................        8.72             2,274,824
     5,000   Supercanal Holdings S.A., due
             12/30/97........................        11.69            5,000,100
    11,000   Supercanal Holdings S.A., due
             08/09/98........................        10.69           11,000,220
    20,000   Western Wireless Corp., due
             03/31/05........................    8.41 to 8.47        19,999,100
    13,200   UIH Latin America, Inc., due
             01/29/98........................        11.69           13,199,868
                                                                   ------------
                                                                     77,270,553
                                                                   ------------
 
             CHEMICALS - SPECIALTY (1.5%)
     3,929   Huntsman Specialty Chemicals
             Corp., due 03/15/04.............        8.25             3,928,571
     3,929   Huntsman Specialty Chemicals
             Corp., due 03/15/05.............        8.50             3,928,532
     5,000   Huntsman Corp., due 06/30/04....        8.00             5,000,050
     6,983   Pioneer America Acquisitions,
             Corp., due 12/05/06.............    8.38 to 8.47         6,981,873
                                                                   ------------
                                                                     19,839,026
                                                                   ------------
 
             COAL (1.0%)
     6,631   Alliance Coal Corp., due
             12/31/02........................        8.97             6,629,995
     7,425   Calciner Industries, Inc., due
             09/30/04........................        8.98             7,424,035
                                                                   ------------
                                                                     14,054,030
                                                                   ------------
 
             COMMERCIAL SERVICES (1.1%)
    14,925   Omni Services, Inc., due
             10/30/05........................        9.06            14,917,985
                                                                   ------------
 
             COMMUNICATIONS -
             EQUIPMENT & SOFTWARE (1.8%)
     1,353   L - 3 Communications Corp., due
             03/31/03........................    7.94 to 8.13         1,353,087
     2,489   L - 3 Communications Corp., due
             03/31/05........................    8.19 to 8.38         2,488,938
     1,639   L - 3 Communications Corp., due
             03/31/06........................    8.44 to 8.63         1,639,049
    12,391   Latin Communications, Inc., due
             02/28/04........................    8.66 to 8.69        12,390,418
     6,000   Telex Communications, Inc., due
             11/06/04........................        8.66             5,999,940
                                                                   ------------
                                                                     23,871,432
                                                                   ------------
 
             COMPUTER SERVICES (1.1%)
    15,000   DecisionOne Corp., due
             08/07/04........................        8.47            14,997,750
                                                                   ------------
 
             COMPUTERS - SYSTEMS (0.5%)
     6,100   Anacomp, Inc., due 03/31/01.....        8.66             6,100,000
                                                                   ------------
 
             CONSUMER PRODUCTS (1.4%)
     9,476   Chattem, Inc., due 02/14/04.....        9.16             9,476,060
     8,978   Playtex Products, Inc., due
             09/15/03........................        7.19             8,976,872
                                                                   ------------
                                                                     18,452,932
                                                                   ------------
 
             CONVENIENCE STORE (1.0%)
     5,000   Caribbean Petroleum, L.P., due
             09/30/05........................        8.97             5,035,650
     8,467   Cumberland Farms, Inc.
             (Participation: Merrill Lynch &
             Co., Inc.) (d), due 12/31/98....        9.00             8,467,368
                                                                   ------------
                                                                     13,503,018
                                                                   ------------
 
             DRUG STORES (0.7%)
    10,000   Duane Reade, Inc., due
             06/15/02........................        10.50           10,000,000
                                                                   ------------
 
             ELECTRONIC & ELECTRICAL
             EQUIPMENT (0.7%)
     4,417   Amphenol Corp., due 05/19/05....    8.44 to 8.78         4,417,126
     4,536   Amphenol Corp., due 05/19/06....    8.94 to 9.28         4,536,379
                                                                   ------------
                                                                      8,953,505
                                                                   ------------
 
             ELECTRONICS (0.6%)
     2,258   Axsys Technologies, Inc., due
             04/25/02........................        9.44             2,258,386
     6,000   Details, Inc., due 01/31/02.....        8.75             5,999,700
                                                                   ------------
                                                                      8,258,086
                                                                   ------------
</TABLE>
 
38
<PAGE>
PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1997 (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 PRINCIPAL             DESCRIPTION
AMOUNT (IN                 AND                      COUPON
THOUSANDS)            MATURITY DATE                  RATE             VALUE
- -----------  --------------------------------  -----------------   ------------
<C>          <S>                               <C>                 <C>
             ENERGY TECHNOLOGY & EQUIPMENT
             (0.8%)
$   11,249   IRI International Corp., due
             03/31/02........................        8.94      %   $ 11,249,118
                                                                   ------------
 
             ENTERTAINMENT & LEISURE TIME
             (0.8%)
    10,797   Six Flag Theme Parks, Inc., due
             06/23/03........................        8.69            10,797,216
                                                                   ------------
 
             FINANCE (1.9%)
    13,000   Blackstone Capital Company II,
             L.L.C., due 05/31/99............        8.66            12,999,870
    13,000   Wasserstein/C & A Holdings,
             L.L.C., due 05/31/99............        8.75            12,999,090
                                                                   ------------
                                                                     25,998,960
                                                                   ------------
 
             FOOD PROCESSING (1.1%)
    10,808   American Italian Pasta Co., due
             02/27/04........................        9.44            10,807,716
     4,000   Southern Foods Group, L.P., due
             03/04/06........................    8.69 to 8.88         3,999,964
                                                                   ------------
                                                                     14,807,680
                                                                   ------------
 
             FOOD SERVICES (2.6%)
     1,667   Ameriserve Food Distribution,
             Inc., due 06/30/04..............        8.69             1,666,667
     1,667   Ameriserve Food Distribution,
             Inc., due 06/30/05..............        8.94             1,666,667
     1,667   Ameriserve Food Distribution,
             Inc., due 06/30/06..............        9.19             1,666,667
     6,689   Rykoff-Sexton, Inc., due
             10/31/02........................        8.69             6,689,256
     3,209   Rykoff-Sexton, Inc., due
             04/30/03........................        8.94             3,209,492
    10,000   SC International Services, Inc.
             & Caterair International Corp.,
             due 03/01/07....................        9.00            10,000,000
     6,617   Volume - Services, Inc., due
             12/31/02........................        9.00             6,616,072
     3,308   Volume - Services, Inc., due
             12/31/03........................        9.50             3,307,919
                                                                   ------------
                                                                     34,822,740
                                                                   ------------
 
             FOODS (0.4%)
     4,460   Leon's Bakery, Inc., due
             05/31/01........................    8.44 to 8.50         4,459,841
     1,180   Leon's Bakery, Inc.
             (Participation: Bankers Trust)
             (d), due 05/31/01...............    8.44 to 8.50         1,180,546
                                                                   ------------
                                                                      5,640,387
                                                                   ------------
 
             FOODS & BEVERAGES (1.6%)
     9,487   International Home Foods, Inc.,
             due 09/30/04....................    7.91 to 9.75         9,487,050
     7,615   Van de Kamps, Inc., due
             04/30/03........................    8.72 to 10.50        7,614,278
     4,778   Van de Kamps, Inc., due
             09/30/03........................    8.97 to 10.75        4,777,353
                                                                   ------------
                                                                     21,878,681
                                                                   ------------
 
             FUNERAL SERVICES (1.5%)
     4,944   Prime Succession, Inc., due
             08/01/03........................        8.75             4,942,192
     4,944   Prime Succession, Inc.
             (Participation: Goldman Sachs &
             Co.) (d), due 08/01/03..........        8.75             4,942,192
     9,867   Rose Hills Co., due 12/01/03....        8.94             9,865,384
                                                                   ------------
                                                                     19,749,768
                                                                   ------------
 
             GAS - TRUCK STOP (0.5%)
     6,667   Petro Stopping Centers, L.P.,
             due 09/30/03....................        9.03             6,666,667
                                                                   ------------
 
             HEALTHCARE (2.7%)
     7,205   Community Health Systems, Inc.,
             due 12/31/03....................        9.00             7,205,479
     7,205   Community Health Systems, Inc.,
             due 12/31/04....................        9.50             7,205,263
     5,425   Community Health Systems, Inc.,
             due 12/31/05....................        9.75             5,424,441
     5,091   Interim Healthcare, Inc., due
             02/29/04........................        10.00            5,090,909
     1,909   Interim Healthcare, Inc., due
             02/28/05........................        10.50            1,909,091
     9,500   PrimeCare International, Inc.,
             due 02/28/02....................    9.09 to 9.25         9,498,860
                                                                   ------------
                                                                     36,334,043
                                                                   ------------
 
             HEALTHCARE - DIVERSIFIED (1.3%)
    17,500   Integrated Health Service, Inc.,
             due 12/31/04....................        7.44            17,500,175
                                                                   ------------
 
             HEATING & AIR CONDITIONING
             (1.9%)
    12,500   Goodman Manufacturing Co., L.P.
             & Amana Company, L.P., due
             09/30/04........................        7.75            12,500,250
    12,500   Goodman Manufacturing Co., L.P.
             & Amana Company, L.P., due
             09/30/05........................        8.00            12,500,250
                                                                   ------------
                                                                     25,000,500
                                                                   ------------
</TABLE>
 
                                                                              39
<PAGE>
PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1997 (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 PRINCIPAL             DESCRIPTION
AMOUNT (IN                 AND                      COUPON
THOUSANDS)            MATURITY DATE                  RATE             VALUE
- -----------  --------------------------------  -----------------   ------------
<C>          <S>                               <C>                 <C>
             HOTELS/MOTELS (1.4%)
$    3,125   Capstar Hotel Co., due
             06/30/04........................        7.47      %   $  3,124,844
     5,971   Doubletree Corp., due
             05/15/04........................        7.94             5,970,694
     9,981   Interstate Hotels Corp., due
             06/25/04........................        7.94             9,981,681
                                                                   ------------
                                                                     19,077,219
                                                                   ------------
 
             HOUSEHOLD APPLIANCES (1.0%)
    12,959   Coinmach Corp., due 06/30/04....        8.44            12,958,080
                                                                   ------------
 
             INSURANCE BROKERS (0.5%)
     7,400   Acordia, Inc., due 12/31/04.....        8.47             7,398,742
                                                                   ------------
 
             MANUFACTURING (2.7%)
     5,714   Alliance Gaming Corp., due
             01/31/05........................    8.47 to 10.25        5,713,508
     2,286   Alliance Gaming Corp., due
             07/31/05........................    8.72 to 10.50        2,285,437
     4,610   Chatham Technologies, Inc., due
             08/18/03........................        8.50             4,609,576
     5,200   Chatham Technologies, due
             08/18/05........................        9.00             5,199,376
     8,846   Desa International, Inc., due
             08/31/01........................        8.25             8,846,170
     9,508   Desa International, Inc., due
             02/28/03........................    8.75 to 10.25        9,507,898
                                                                   ------------
                                                                     36,161,965
                                                                   ------------
 
             MANUFACTURING - CONSUMER &
             INDUSTRIAL PRODUCTS (1.1%)
     4,571   C.S. Brooks Canada, Inc., due
             06/30/02........................        9.00             4,570,365
    10,156   C.S. Brooks Canada, Inc., due
             06/30/04........................        9.25            10,156,061
                                                                   ------------
                                                                     14,726,426
                                                                   ------------
 
             MANUFACTURING - DIVERSIFIED
             (2.7%)
     8,123   Adience, Inc. and Refraco
             Holdings, Ltd., due 04/15/05....        8.69             8,122,500
     7,000   Doskocil Manufacturing Co., due
             09/30/04........................        8.41             6,999,930
     5,636   Mettler-Toledo, Inc., due
             12/31/04........................        7.91             5,635,675
    10,857   Refraco, Inc., due 10/15/05.....        9.44            10,857,143
     4,721   Signature Brands, Inc., due
             08/15/01........................        8.38             4,719,656
                                                                   ------------
                                                                     36,334,904
                                                                   ------------
 
             MANUFACTURING - RENTAL
             CAREER APPAREL (0.5%)
     6,237   The William Carter Co., due
             10/30/03........................    8.72 to 8.88         6,235,910
                                                                   ------------
 
             MEDICAL EQUIPMENT (0.9%)
       869   Hanger Orthopedic Group, Inc.,
             due 12/31/03....................        8.50               869,031
     1,003   JE Hanger, Inc. of Georgia, due
             12/31/03........................        8.50             1,002,721
     2,625   Medical Specialties Group, Inc.,
             due 06/30/01....................    8.84 to 10.50        2,624,845
     7,205   Medical Specialties Group, Inc.,
             due 06/30/04....................    9.59 to 11.25        7,204,114
                                                                   ------------
                                                                     11,700,711
                                                                   ------------
 
             MEDICAL PRODUCTS & SUPPLIES
             (2.0%)
     2,447   Alaris Medical Systems, Inc.,
             due 11/01/03....................    8.69 to 8.75         2,446,195
     2,447   Alaris Medical Systems, Inc.,
             due 11/01/04....................    9.19 to 9.25         2,446,170
     2,303   Alaris Medical Systems, Inc.,
             due 05/01/05....................    9.44 to 9.50         2,302,255
     2,177   Dade International, Inc., due
             12/31/01........................        7.94             2,177,419
     5,893   Dade International, Inc., due
             12/31/02........................    8.19 to 8.56         5,893,286
     5,893   Dade International, Inc., due
             12/31/03........................    8.44 to 8.81         5,893,259
     5,133   Dade International, Inc., due
             12/31/04........................        8.69             5,132,726
                                                                   ------------
                                                                     26,291,310
                                                                   ------------
 
             MEDICAL SERVICES (1.0%)
    10,000   SMT Health Services, Inc., due
             08/31/03........................        8.94            10,000,044
     4,000   Transportacion Ferroviaria
             Mexicana, S.A. de C.V., due
             12/23/02........................        9.75             3,999,960
                                                                   ------------
                                                                     14,000,004
                                                                   ------------
 
             METALS & MINING (0.6%)
     8,705   U.S. Silica Corp., due
             12/31/03........................        8.97             8,704,684
                                                                   ------------
</TABLE>
 
40
<PAGE>
PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1997 (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 PRINCIPAL             DESCRIPTION
AMOUNT (IN                 AND                      COUPON
THOUSANDS)            MATURITY DATE                  RATE             VALUE
- -----------  --------------------------------  -----------------   ------------
<C>          <S>                               <C>                 <C>
             MISCELLANEOUS (2.2%)
$   16,000   Mafco Finance Corp., due
             03/20/99........................        10.16     %   $ 15,999,680
     1,280   Mafco Finance Corp. (Revolver),
             due 03/20/99....................        10.16            1,279,971
    12,594   Pinnacle Brands, Inc., due
             05/29/02........................        8.97            12,591,735
                                                                   ------------
                                                                     29,871,386
                                                                   ------------
 
             PACKAGING & BOTTLING (0.4%)
     4,975   MPC Packaging Corp., due
             05/30/04........................        8.72             4,974,254
                                                                   ------------
 
             PAPER (3.0%)
    12,405   Alabama Pine Pulp Co., Inc., due
             12/31/02........................    6.85 to 6.98        10,706,099
     1,952   Crown Paper Co., due 08/22/02...        8.19             1,951,822
     2,468   Crown Paper Co. (Revolver), due
             08/22/02........................    8.19 to 10.00        2,467,764
     9,899   Crown Paper Co., due 08/22/03...    9.00 to 9.25         9,899,267
     7,268   St. Laurent Paper Products
             Corp., due 05/31/03.............    9.00 to 9.25         7,267,412
     7,732   St. Laurent Paper Products
             Corp., due 05/31/04.............    9.25 to 9.50         7,731,147
                                                                   ------------
                                                                     40,023,511
                                                                   ------------
 
             PLASTICS (1.3%)
     7,905   Jet Plastica Industries, Inc.,
             due 12/31/02....................        8.31             7,905,405
     9,143   Jet Plastica Industries, Inc.,
             due 12/31/04....................        8.81             9,143,243
                                                                   ------------
                                                                     17,048,648
                                                                   ------------
 
             PRINTED CIRCUIT BOARDS (0.8%)
     6,953   Celestica, Inc., due 04/22/03...        8.75             6,952,777
     2,489   Circo Craft Technologies, Inc.,
             due 06/30/04....................        8.66             2,488,611
     1,500   Circo Craft Technologies, Inc.,
             due 06/30/05....................        9.16             1,499,985
                                                                   ------------
                                                                     10,941,373
                                                                   ------------
 
             PUBLISHING (1.3%)
    11,000   Cygnus Publishing, Inc., due
             06/05/05........................    8.50 to 8.59        10,998,515
     3,363   Von Hoffman Press, Inc., due
             05/30/04........................        8.47             3,361,962
     3,363   Von Hoffman Press, Inc., due
             05/30/05........................        8.72             3,361,962
                                                                   ------------
                                                                     17,722,439
                                                                   ------------
 
             PUBLISHING - BUSINESS (1.1%)
    14,375   Advanstar Communications, Inc.,
             due 12/31/03....................        8.66            14,374,425
                                                                   ------------
 
             PUBLISHING - NEWSPAPER (1.2%)
     5,000   21st Century Newspapers, Inc.,
             due 09/15/05....................        8.44             5,000,000
    11,000   Newsquest Media Group, Ltd., due
             12/31/04........................        8.16            11,000,000
                                                                   ------------
                                                                     16,000,000
                                                                   ------------
 
             RECORD & TAPE DISTRIBUTION
             (0.2%)
     4,876   Camelot Music, Inc. (c), due
             02/28/01........................        10.00            3,022,500
                                                                   ------------
 
             RESTAURANTS (0.6%)
     8,645   Houlihan's Restaurants, Inc.,
             due 04/15/04....................    9.54 to 11.00        8,644,913
                                                                   ------------
 
             RETAIL - DEPARTMENT STORES
             (0.8%)
    10,198   The Caldor Corp. (Revolver), due
             12/31/98........................    6.69 to 8.75        10,198,312
                                                                   ------------
 
             SEMICONDUCTORS (0.5%)
     7,417   Fairchild Semiconductor Corp.,
             due 03/11/03....................    8.75 to 9.04         7,416,695
                                                                   ------------
 
             SPECIALTY PACKAGING (0.8%)
     5,880   Calmar, Inc., due 09/15/03......    8.72 to 10.50        5,879,006
     4,410   Calmar, Inc., due 03/15/04......    8.97 to 10.75        4,409,208
                                                                   ------------
                                                                     10,288,214
                                                                   ------------
</TABLE>
 
                                                                              41
<PAGE>
PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1997 (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 PRINCIPAL             DESCRIPTION
AMOUNT (IN                 AND                      COUPON
THOUSANDS)            MATURITY DATE                  RATE             VALUE
- -----------  --------------------------------  -----------------   ------------
<C>          <S>                               <C>                 <C>
             SPORTING GOODS (2.1%)
$    4,117   E & S Holdings Corp., due
             09/30/03........................        7.91      %   $  4,117,606
       645   E & S Holdings Corp. (Revolver),
             due 09/30/03....................    7.91 to 9.75           644,706
     7,000   E & S Holdings Corp., due
             09/30/04........................        8.41             6,999,973
     7,000   E & S Holdings Corp., due
             09/30/05........................        8.91             6,999,930
     4,000   E & S Holdings Corp., due
             03/30/06........................        9.41             3,999,960
       897   Worldwide Sports & Recreation,
             Inc., due 04/26/00..............        8.81               897,215
     4,903   Worldwide Sports & Recreation,
             Inc., due 04/26/01..............        9.25             4,902,921
                                                                   ------------
                                                                     28,562,311
                                                                   ------------
 
             SUPERMARKETS (2.0%)
     5,333   Itaperuna Participacoes S.A.,
             due 06/02/02....................        10.75            5,332,427
     1,173   Ralph's Grocery Company, due
             02/15/03........................        7.50             1,173,321
       616   Ralph's Grocery Company
             (Revolver), due 02/15/03........    7.44 to 7.50           615,981
     3,973   Ralph's Grocery Company, due
             02/15/04........................        8.00             3,972,439
     6,903   Ralph's Grocery Company
             (Participation: Bankers Trust)
             (d), due 02/15/04...............        8.00             6,902,726
     3,766   Star Markets Company, Inc., due
             12/31/01........................        8.82             3,764,622
     2,818   Star Markets Company, Inc., due
             12/31/02........................        9.32             2,817,463
     2,500   Star Markets Company, Inc., due
             12/31/03........................        9.32             2,499,150
                                                                   ------------
                                                                     27,078,129
                                                                   ------------
 
             TEXTILES (0.5%)
     4,605   Joan Fabrics Corp., due
             06/30/05........................        8.84             4,604,158
     2,395   Joan Fabrics Corp., due
             06/30/06........................        9.34             2,394,114
                                                                   ------------
                                                                      6,998,272
                                                                   ------------
 
             TOYS (1.1%)
     7,223   Ritvik Toys, Inc., due
             02/08/03........................        9.19             7,223,045
     7,223   Ritvik Toys, Inc., due
             02/08/04........................        9.69             7,222,973
                                                                   ------------
                                                                     14,446,018
                                                                   ------------
 
             WASTE DISPOSAL (0.4%)
     5,940   Allied Waste North America,
             Inc., due 12/05/03..............    7.69 to 8.00         5,939,978
                                                                   ------------
 
             WHOLESALE DISTRIBUTOR (1.4%)
    14,724   American Marketing Industries,
             Inc., due 11/29/02..............    9.13 to 9.19        14,724,623
     3,980   American Marketing Industries,
             Inc., due 11/30/03..............        9.19             3,980,000
                                                                   ------------
                                                                     18,704,623
                                                                   ------------
 
             WIRE & CABLE (1.0%)
    12,980   International Wire Group, Inc.,
             due 09/30/03....................    7.72 to 7.82        12,979,328
                                                                   ------------
             TOTAL SENIOR COLLATERIZED TERM LOANS (IDENTIFIED
             COST $1,142,983,932)...............................   $1,140,452,162
                                                                   ------------
<CAPTION>
 NUMBER OF
  SHARES
- -----------
<C>          <S>                               <C>                 <C>
PREFERRED STOCK (b) (0.1%)
 
             APPAREL
             London Fog Industries, Inc. (Series A-1)
     1,722 K (Restricted) ++
             (Identified Cost $2,476,954).......................
                                                                      1,222,422
                                                                   ------------
COMMON STOCKS (b) (0.0%)
 
             APPAREL (0.0%)
     1,291   London Fog Industries, Inc. (Restricted)...........             --
                                                                   ------------
 
             FOOD SERVICES (0.0%)
     4,209   Flagstar Companies, Inc. (Restricted)..............          1,431
                                                                   ------------
             TOTAL COMMON STOCKS (IDENTIFIED COST $60,507)......          1,431
                                                                   ------------
<CAPTION>
 PRINCIPAL
AMOUNT (IN                                          COUPON
THOUSANDS)                                           RATE
- -----------                                    -----------------
<C>          <S>                               <C>                 <C>
SHORT-TERM INVESTMENTS (13.8%)
                  COMMERCIAL PAPER (e) (5.9%)
 
             FINANCE - CONSUMER (3.7%)
$   50,000   American Express Credit Corp.
             (f), due 10/01/97...............        5.60      %     50,000,000
                                                                   ------------
</TABLE>
 
42
<PAGE>
PRIME INCOME TRUST
PORTFOLIO OF INVESTMENTS SEPTEMBER 30, 1997 (CONTINUED)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 PRINCIPAL
AMOUNT (IN                                          COUPON
THOUSANDS)                                           RATE             VALUE
- -----------                                    -----------------   ------------
<C>          <S>                               <C>                 <C>
             FINANCE - DIVERSIFIED (2.2%)
$   30,000   General Electric Capital Corp.,
             due 10/03/97....................        5.78      %   $ 29,990,367
                                                                   ------------
             TOTAL COMMERICAL PAPER (AMORTIZED COST $79,990,367)
                                                                     79,990,367
                                                                   ------------
 
             U.S. GOVERNMENT AGENCY (e) (f)
             (5.2%)
    70,000   Federal National Mortgage Assoc.
             (Amortized Cost $69,989,383),
             due 10/02/97....................        5.46            69,989,383
                                                                   ------------
REPURCHASE AGREEEMENT (2.7%)
    35,607   The Bank of New York (dated
             09/30/97; proceeds $35,612,669;)
             (Identified Cost $35,607,476)
             (g), due 10/01/97...............        5.25            35,607,476
                                                                   ------------
</TABLE>
 
<TABLE>
<S>                                                 <C>          <C>
TOTAL SHORT-TERM INVESTMENTS (IDENTIFIED COST
$185,587,226)............................................           185,587,226
                                                                 --------------
TOTAL INVESTMENTS (IDENTIFIED COST $1,331,108,619)
(h)...............................................   98.7%        1,327,263,241
CASH AND OTHER ASSETS IN EXCESS OF LIABILITIES....    1.3            17,339,981
                                                    -----        --------------
NET ASSETS........................................  100.0%       $1,344,603,222
                                                    -----        --------------
                                                    -----        --------------
</TABLE>
 
- ----------------------------------
 
<TABLE>
<C>  <S>
 K   IN THOUSANDS.
 
 +   ACCRUES INTEREST AT A RATE OF PRIME PLUS 1% WITH 3% PAID IN CASH AND THE
     REMAINDER TO BE PAID-IN-KIND; CONVERTS TO PRIME PLUS 1 PERCENT CASH
     PAYMENT ON MAY 31, 2000.
 
++   PAYMENT-IN-KIND SECURITY.
 
(a)  FLOATING RATE SECURITIES. INTEREST RATES SHOWN ARE THOSE IN EFFECT AT
     SEPTEMBER 30, 1997.
 
(b)  NON-INCOME PRODUCING SECURITIES.
 
(c)  NON-INCOME PRODUCING SECURITY; ISSUER IN BANKRUPTCY.
 
(d)  PARTICIPATION INTERESTS WERE ACQUIRED THROUGH THE FINANCIAL INSTITUTIONS
     INDICATED PARENTHETICALLY.
 
(e)  SECURITIES WERE PURCHASED ON A DISCOUNT BASIS. THE INTEREST RATES SHOWN
     HAVE BEEN ADJUSTED TO REFLECT A MONEY MARKET EQUIVALENT YIELD.
 
(f)  ALL OR A PORTION OF THESE SECURITIES ARE SEGREGATED IN CONNECTION WITH
     UNFUNDED LOAN COMMITMENTS.
 
(g)  COLLATERALIZED BY $35,012,159 U.S. TREASURY NOTE 6.75% DUE 05/31/99 VALUED
     AT $36,319,625 AND $244 U.S. TREASURY BOND 11.625% DUE 11/15/04 VALUED AT
     $331.
 
(h)  THE AGGREGATE COST FOR FEDERAL INCOME TAX PURPOSES APPROXIMATES IDENTIFIED
     COST. THE AGGREGATE GROSS UNREALIZED APPRECIATION IS $779,103 AND THE
     AGGREGATE GROSS UNREALIZED DEPRECIATION IS $4,624,481, RESULTING IN NET
     UNREALIZED DEPRECIATION OF $3,845,378.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
                                                                              43
<PAGE>
PRIME INCOME TRUST
FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------
 
STATEMENT OF ASSETS AND LIABILITIES
SEPTEMBER 30, 1997
 
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                              <C>
ASSETS:
Investments in securities, at value
  (identified cost $1,331,108,619).............  $1,327,263,241
Cash...........................................      12,028,239
Receivable for:................................
  Interest.....................................       7,764,950
  Shares of beneficial interest sold...........       4,053,596
  Investments sold.............................         245,000
Prepaid expenses and other assets..............         434,146
                                                 --------------
      TOTAL ASSETS.............................   1,351,789,172
                                                 --------------
LIABILITIES:
Payable for:
  Dividends to shareholders....................       1,225,158
  Investment advisory fee......................       1,022,134
  Administration fee...........................         294,181
Accrued expenses and other payables............         269,016
Deferred loan fees.............................       4,375,461
Commitment and contingencies (Note 7)..........        --
                                                 --------------
      TOTAL LIABILITIES........................       7,185,950
                                                 --------------
      NET ASSETS...............................  $1,344,603,222
                                                 --------------
                                                 --------------
COMPOSITION OF NET ASSETS:
Paid-in-capital................................  $1,348,358,142
Net unrealized depreciation....................      (3,845,378)
Accumulated undistributed net investment
  income.......................................         526,876
Accumulated net realized loss..................        (436,418)
                                                 --------------
      NET ASSETS...............................  $1,344,603,222
                                                 --------------
                                                 --------------
NET ASSET VALUE PER SHARE, 135,154,983 shares
  outstanding (unlimited shares authorized of
  $.01 par value)..............................           $9.95
                                                 --------------
                                                 --------------
</TABLE>
 
STATEMENT OF OPERATIONS
FOR THE YEAR ENDED SEPTEMBER30, 1997
 
<TABLE>
<S>                                                <C>
NET INVESTMENT INCOME:
  INCOME
    Interest.....................................  $  97,732,391
    Facility, amendment and other loan fees......      4,137,689
    Other income.................................        441,233
                                                   -------------
      TOTAL INCOME...............................    102,311,313
                                                   -------------
  EXPENSES
    Investment advisory fee......................      9,981,012
    Administration fee...........................      2,862,062
    Professional fees............................        978,890
    Facility fees................................        971,755
    Transfer agent fees and expenses.............        600,085
    Shareholder reports and notices..............        269,479
    Registration fees............................        204,234
    Custodian fees...............................         76,302
    Trustees' fees and expenses..................         15,441
    Other........................................        102,538
                                                   -------------
      TOTAL EXPENSES.............................     16,061,798
                                                   -------------
        NET INVESTMENT INCOME....................     86,249,515
 
NET REALIZED AND UNREALIZED GAIN (LOSS):
  Net realized gain..............................      3,073,930
  Net change in unrealized depreciation..........     (3,410,252)
                                                   -------------
      NET LOSS...................................       (336,322)
                                                   -------------
        NET INCREASE.............................  $  85,913,193
                                                   -------------
                                                   -------------
</TABLE>
 
STATEMENT OF CHANGES IN NET ASSETS
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                                  FOR THE            FOR THE
                                                                                                YEAR ENDED         YEAR ENDED
                                                                                               SEPTEMBER 30,      SEPTEMBER 30,
INCREASE (DECREASE) IN NET ASSETS:                                                                 1997               1996
                                                                                             -----------------  -----------------
<S>                                                                                          <C>                <C>
 Operations:
    Net investment income..................................................................   $    86,249,515    $    55,337,469
    Net realized gain (loss)...............................................................         3,073,930         (1,507,802)
    Net change in unrealized depreciation..................................................        (3,410,252)        (2,222,920)
                                                                                             -----------------  -----------------
      Net Increase.........................................................................        85,913,193         51,606,747
                                                                                             -----------------  -----------------
  Dividends from net investment income.....................................................       (84,598,513)       (55,512,316)
Net increase from transactions in shares of beneficial interest............................       403,817,997        422,015,153
                                                                                             -----------------  -----------------
      Net increase.........................................................................       405,132,677        418,109,584
NET ASSETS:
  Beginning of period......................................................................       939,470,545        521,360,961
                                                                                             -----------------  -----------------
  END OF PERIOD (Including undistributed net investment income of $526,876 and $238,827,
   respectively)...........................................................................   $ 1,344,603,222    $   939,470,545
                                                                                             -----------------  -----------------
                                                                                             -----------------  -----------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
44
<PAGE>
PRIME INCOME TRUST
FINANCIAL STATEMENTS (CONTINUED)
- --------------------------------------------------------------------------------
 
STATEMENT OF CASH FLOWS
FOR THE YEAR ENDED SEPTEMBER 30, 1997
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                                          <C>
INCREASE (DECREASE) IN CASH:
Cash Flows Provided by Operating Activities:
  Net investment income....................................................................................    $     86,249,515
  Adjustments to reconcile net investment income to net cash provided by operating activities:
    Increase in receivables and other assets related to operations.........................................          (1,042,457)
    Increase in payables related to operations.............................................................             492,678
    Net loan fees received.................................................................................           4,280,984
    Amortization of loan fees..............................................................................          (5,540,967)
    Accretion of discounts.................................................................................          (1,146,844)
                                                                                                             --------------------
      Net cash provided by operating activities............................................................          83,292,909
                                                                                                             --------------------
Cash Flows Used for Investing Activities:
  Purchases of investments.................................................................................      (1,112,239,537)
  Principal repayments/sales of investments................................................................         846,513,445
  Net purchases of short-term investments..................................................................        (128,720,350)
                                                                                                             --------------------
      Net cash used for investing activities...............................................................        (394,446,442)
                                                                                                             --------------------
Cash Flows Provided by Financing Activities:
  Shares of beneficial interest sold.......................................................................         450,036,220
  Shares tendered..........................................................................................         (86,013,853)
  Dividends from net investment income (net of reinvested dividends of $39,655,716)........................         (44,549,772)
                                                                                                             --------------------
      Net cash provided by financing activities............................................................         319,472,595
                                                                                                             --------------------
Net increase in cash.......................................................................................           8,319,062
Cash balance at beginning of year..........................................................................           3,709,177
                                                                                                             --------------------
CASH BALANCE AT END OF YEAR................................................................................    $     12,028,239
                                                                                                             --------------------
                                                                                                             --------------------
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
                                                                              45
<PAGE>
PRIME INCOME TRUST
NOTES TO FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------
 
1.  ORGANIZATION AND ACCOUNTING POLICIES--Prime Income Trust (the "Trust") is
    registered under the Investment Company Act of 1940, as amended, as a
non-diversified, closed-end management investment company. The Trust's
investment objective is to provide a high level of current income consistent
with the preservation of capital. The Trust was organized as a Massachusetts
business trust on August 17, 1989 and commenced operations on November 30, 1989.
 
    The Trust offers and sells its shares to the public on a continuous basis.
The Trustees intend, each quarter, to consider authorizing the Trust to make
tender offers for all or a portion of its outstanding shares of beneficial
interest at the then current net asset value of such shares.
 
    The preparation of financial statements in accordance with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts and disclosures. Actual results
could differ from those estimates.
 
    The following is a summary of significant accounting policies:
 
    A.  VALUATION OF INVESTMENTS--(1) The Trustees believe that, at present,
    there are not sufficient market quotations provided by banks, dealers or
    pricing services respecting interests in senior collateralized loans
    ("Senior Loans") to corporations, partnerships and other entities
    ("Borrower") to enable the Trust to properly value Senior Loans based on
    available market quotations. Accordingly, until the market for Senior Loans
    develops, interests in Senior Loans held by the Trust are valued at their
    fair value in accordance with procedures established in good faith by the
    Trustees. Under the procedures, adopted by the Trustees, interests in Senior
    Loans are priced using a matrix which takes into account the relationship
    between current interest rates and interest rates payable on each Senior
    Loan, as well as the total number of days in each interest period and the
    period remaining until the next interest rate determination or maturity of
    the Senior Loan. Adjustments in the matrix-determined price of a Senior Loan
    will be made in the event of a default on a Senior Loan or a significant
    change in the creditworthiness of the Borrower. The fair values determined
    in accordance with these procedures may differ significantly from the market
    values that would have been used had a ready market for the Senior Loans
    existed; (2) portfolio securities for which over-the-counter market
    quotations are readily available are valued at the latest bid price; (3) all
    other securities and other assets are valued at their fair value as
    determined in good faith under procedures established by and under the
    general supervision of the Trustees; and (4) short-term debt securities
    having a maturity date of more than sixty days at time of purchase are
    valued on a mark-to-market basis until sixty days prior to maturity and
    thereafter at amortized cost based on their value on the 61st day.
    Short-term debt securities having a maturity date of sixty days or less at
    the time of purchase are valued at amortized cost.
 
    B.  ACCOUNTING FOR INVESTMENTS--Security transactions are accounted for on
    the trade date (date the order to buy or sell is executed). Realized gains
    and losses on security transactions are determined by the identified cost
    method. Interest income is accrued daily except where collection is not
    expected. When the Trust buys an interest in a Senior Loan, it may receive a
    facility fee, which is a fee paid to lenders upon origination of a Senior
    Loan, and/or a commitment fee which is paid to lenders on an ongoing basis
    based upon the undrawn portion committed by the lenders of the underlying
    Senior Loan. The Trust amortizes the facility fee and accrues the commitment
    fee over the expected term of the loan. When the Trust sells an interest in
    a Senior Loan, it may be required to pay fees or commissions to the
    purchaser of the interest. Fees received in connection with loan amendments
    are amortized over the expected term of the loan.
 
    C.  SENIOR LOANS--The Trust invests primarily in Senior Loans to Borrowers.
    Senior Loans are typically structured by a syndicate of lenders ("Lenders"),
    one or more of which administers the Senior Loan on behalf of the Lenders
    ("Agent"). Lenders may sell interests in Senior Loans to third parties
    ("Participations") or may assign all or a portion of their interest in a
    Senior Loan to third parties ("Assignments"). Senior Loans are exempt from
    registration under the Securities Act of 1933. Presently, Senior Loans are
    not readily marketable and are often subject to restrictions on resale.
 
    Some of the Trust's Senior Loans are "Revolver Loans." For these loans, the
    Trust commits to provide funding up to the face amount of the loan. The
    amount drawn down by the borrower may vary during the term of the loan.
 
    D.  FEDERAL INCOME TAX STATUS--It is the Trust's policy to comply with the
    requirements of the Internal Revenue Code applicable to regulated investment
    companies and to distribute all of its taxable income to its shareholders.
    Accordingly, no federal income tax provision is required.
 
    E.  DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS--The Trust records dividends
    and distributions to its shareholders on the record date. The amount of
    dividends and distributions from net investment income and net realized
    capital gains are determined in accordance with federal income tax
    regulations which may differ from generally accepted accounting principles.
    These "book/tax" differences are either considered temporary or permanent in
    nature. To the extent these differences are permanent in nature, such
    amounts are reclassified within the capital accounts based on their federal
    tax-basis treatment; temporary differences do not require reclassification.
    Dividends and distributions which exceed net investment income and net
    realized capital gains for financial reporting purposes but not for tax
    purposes are reported as
 
46
<PAGE>
PRIME INCOME TRUST
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
- --------------------------------------------------------------------------------
    dividends in excess of net investment income or distributions in excess of
    net realized capital gains. To the extent they exceed net investment income
    and net realized capital gains for tax purposes, they are reported as
    distributions of paid-in-capital.
 
2.  INVESTMENT ADVISORY AGREEMENT--Pursuant to an Investment Advisory Agreement
    with Dean Witter InterCapital Inc. (the "Investment Advisor"), the Trust
pays an advisory fee, accrued daily and payable monthly, by applying the
following annual rates to the net assets of the Trust determined as of the close
of each business day: 0.90% to the portion of the daily net assets not exceeding
$500 million and 0.85% to the portion of the daily net assets exceeding $500
million.
 
    Under the terms of the Agreement, in addition to managing the Trust's
investments, the Investment Advisor pays the salaries of all personnel,
including officers of the Trust, who are employees of the Investment Advisor.
 
3.  ADMINISTRATION AGREEMENT--Pursuant to an Administration Agreement with Dean
    Witter Services Company Inc. (the "Administrator"), an affiliate of the
Investment Advisor, the Trust pays an administration fee, calculated daily and
payable monthly, by applying the annual rate of 0.25% to the Trust's daily net
assets.
 
    Under the terms of the Administration Agreement, the Administrator maintains
certain of the Trust's books and records and furnishes, at its own expense,
office space, facilities, equipment, clerical, bookkeeping and certain legal
services and pays the salaries of all personnel, including officers of the Trust
who are employees of the Administrator. The Administrator also bears the cost of
telephone services, heat, light, power and other utilities provided to the
Trust.
 
4.  SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES--The cost of
    purchases and proceeds from sales/principal repayments of portfolio
securities, excluding short-term investments, for the year ended September 30,
1997 aggregated $1,112,239,537 and $846,758,445, respectively.
 
    Shares of the Trust are distributed by Dean Witter Distributors Inc. (the
"Distributor"), an affiliate of the Investment Advisor and Administrator.
Pursuant to a Distribution Agreement between the Trust, the Investment Advisor
and the Distributor, the Investment Advisor compensates the Distributor at a
rate of 2.75% of the purchase price of shares purchased from the Trust. The
Investment Advisor will compensate the Distributor at an annual rate of 0.10% of
the value of shares sold for any shares that remain outstanding after one year
from the date of their initial purchase. An early withdrawal charge payable to
the Investment Advisor to defray distribution expenses will be charged to the
shareholder in connection with shares held for four years or less which are
accepted by the Trust for repurchase pursuant to tender offers. For the year
ended September 30, 1997, the Investment Advisor has informed the Trust that it
received approximately $1,296,000 in early withdrawal charges.
 
    Dean Witter Trust FSB, an affiliate of the Investment Advisor and
Administrator, is the Trust's transfer agent. At September 30, 1997, the Trust
had transfer agent fees and expenses payable of approximately $7,000.
 
    The Trust has an unfunded noncontributory defined benefit pension plan
covering all independent Trustees of the Trust who will have served as
independent Trustees for at least five years at the time of retirement. Benefits
under this plan are based on years of service and compensation during the last
five years of service. Aggregate pension costs for the year ended September 30,
1997 included in Trustees' fees and expenses in the Statement of Operations
amounted to $5,567. At September 30, 1997, the Trust had an accrued pension
liability of $48,094 which is included in accrued expenses in the Statement of
Assets and Liabilities.
 
5.  SHARES OF BENEFICIAL INTEREST--Transactions in shares of beneficial interest
    were as follows:
 
<TABLE>
<CAPTION>
                                                                 SHARES           AMOUNT
                                                              -------------   ---------------
<S>                                                           <C>             <C>
Balance, September 30, 1995.................................     52,197,974   $   522,524,992
Shares sold.................................................     45,304,780       451,573,849
Shares issued to shareholders for reinvestment of
 dividends..................................................      2,706,326        26,959,275
Shares tendered (four quarterly tender offers)..............     (5,673,770)      (56,517,971)
                                                              -------------   ---------------
Balance, September 30, 1996.................................     94,535,310       944,540,145
Shares sold.................................................     45,281,310       450,176,134
Shares issued to shareholders for reinvestment of
 dividends..................................................      3,988,872        39,655,716
Shares tendered (four quarterly tender offers)..............     (8,650,509)      (86,013,853)
                                                              -------------   ---------------
Balance, September 30, 1997.................................    135,154,983   $ 1,348,358,142
                                                              -------------   ---------------
                                                              -------------   ---------------
</TABLE>
 
    On October 23, 1997, the Trustees approved a tender offer to purchase up to
4 million shares of beneficial interest to commence on November 19, 1997.
 
                                                                              47
<PAGE>
PRIME INCOME TRUST
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
- --------------------------------------------------------------------------------
 
6.  FEDERAL INCOME TAX STATUS--During the year ended September 30, 1997, the
    Trust utilized approximately $3,527,000 of its net capital loss carryover.
At September 30, 1997, the Trust had a net capital loss carryover of
approximately $208,000 available through September 30, 2004 to offset future
capital gains to the extent provided by regulations.
 
    As of September 30, 1997, the Trust had temporary book/tax differences
primarily attributable to dividends payable and permanent book/tax differences
attributable to tax adjustments on revolver loans sold by the Trust. To reflect
reclassifications arising from the permanent differences, accumulated
undistributed net investment income was charged and accumulated net realized
loss was credited $1,362,953.
 
7.  COMMITMENTS AND CONTINGENCIES--As of September 30, 1997, the Trust had
    unfunded loan commitments pursuant to the following loan agreements:
 
<TABLE>
<CAPTION>
                                                                      UNFUNDED
                            BORROWER                                 COMMITMENT
- -----------------------------------------------------------------  --------------
<S>                                                                <C>
American Italian Pasta Co........................................  $   6,000,000
Caldor Corp......................................................      7,131,181
Capstar Hotels Company...........................................      3,125,000
Chancellor Media Corp............................................      3,650,500
Chatham Technologies.............................................      5,189,917
ComNet Cellular..................................................     15,000,000
Crown Paper Co...................................................      5,244,074
Dade International, Inc..........................................      2,693,548
E & S Holdings Corp..............................................      5,237,647
Fairchild Holding Corp...........................................      4,365,079
Hard Rock Hotel..................................................      8,000,000
Jet Plastica Industries..........................................      2,702,703
Leons Bakery, Inc................................................      2,529,412
Mafco Finance Corp...............................................      2,720,000
Ralph's Grocery Company, Inc.....................................      1,290,667
Stroh Brewery, Inc...............................................        550,000
UIH Latin America................................................      1,800,000
                                                                   --------------
                                                                   $  77,229,728
                                                                   --------------
                                                                   --------------
</TABLE>
 
    Total value of securities segregated for unfunded loan commitments were
$81,989,383.
 
8.  FINANCIAL INSTRUMENTS WITH CONCENTRATION OF CREDIT RISK--When the Trust
    purchases a Participation, the Trust typically enters into a contractual
relationship with the Lender or third party selling such Participation ("Selling
Participant"), but not with the Borrower. As a result, the Trust assumes the
credit risk of the Borrower, the Selling Participant and any other persons
interpositioned between the Trust and the Borrower ("Intermediate Participants")
and the Trust may not directly benefit from the collateral supporting the Senior
Loan in which it has purchased the Participation. Because the Trust will only
acquire Participations if the Selling Participant and each Intermediate
Participant is a financial institution, the Trust may be considered to have a
concentration of credit risk in the banking and brokerage industry. At September
30, 1997, such Participations had a fair value of $21,492,832.
 
    The Trust will only invest in Senior Loans where the Investment Advisor
believes that the Borrower can meet debt service requirements in a timely manner
and where the market value of the collateral at the time of investment equals or
exceeds the amount of the Senior Loan. In addition, the Trust will only acquire
Participations if the Selling Participant, and each Intermediate Participant, is
a financial institution which meets certain minimum creditworthiness standards.
 
48
<PAGE>
PRIME INCOME TRUST
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
 
Selected ratios and per share data for a share of beneficial interest
outstanding throughout each period:
<TABLE>
<CAPTION>
                                                                         FOR THE YEAR ENDED SEPTEMBER 30,
                                                    --------------------------------------------------------------------------
                                                      1997       1996       1995       1994       1993       1992       1991
                                                    --------   --------   --------   --------   --------   --------   --------
<S>                                                 <C>        <C>        <C>        <C>        <C>        <C>        <C>
PER SHARE OPERATING PERFORMANCE:
  Net asset value, beginning of period............   $9.94     $ 9.99     $10.00     $   9.91   $   9.99   $10.00     $10.00
                                                    --------   --------   --------   --------   --------   --------   --------
  Net investment income...........................    0.75       0.74       0.82         0.62       0.55     0.62       0.84
  Net realized and unrealized gain (loss).........      --      (0.04)      0.01         0.09      (0.08)   (0.01)        --
                                                    --------   --------   --------   --------   --------   --------   --------
  Total from investment operations................    0.75       0.70       0.83         0.71       0.47     0.61       0.84
                                                    --------   --------   --------   --------   --------   --------   --------
  Less dividends and distributions from:
    Net investment income.........................   (0.74)     (0.75)     (0.81)       (0.62)     (0.55)   (0.62)     (0.84)
    Net realized gain.............................      --         --      (0.03)          --         --       --         --
                                                    --------   --------   --------   --------   --------   --------   --------
Total dividends and distributions.................   (0.74)     (0.75)     (0.84)       (0.62)     (0.55)   (0.62)     (0.84)
                                                    --------   --------   --------   --------   --------   --------   --------
Net asset value, end of period....................  $ 9.95     $ 9.94     $ 9.99       $10.00   $   9.91   $ 9.99     $10.00
                                                    --------   --------   --------   --------   --------   --------   --------
                                                    --------   --------   --------   --------   --------   --------   --------
TOTAL INVESTMENT RETURN+..........................    7.78%      7.25%      8.57%        7.32%      4.85%    6.23%      8.77%
RATIOS TO AVERAGE NET ASSETS:
Expenses..........................................    1.40%      1.46%      1.52%        1.60%      1.45%    1.47%      1.52%
Net investment income.............................    7.53%      7.50%      8.11%        6.14%      5.53%    6.14%      8.23%
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands...........  $1,344,603 $939,471   $521,361   $305,034   $311,479   $413,497   $479,941
Portfolio turnover rate...........................       86%        72%       102%       147%        92%        46%        42%
 
<CAPTION>
                                                       FOR THE
                                                       PERIOD
                                                    NOVEMBER 30,
                                                    1989* THROUGH
                                                    SEPTEMBER 30,
                                                        1990
                                                    -------------
<S>                                                 <C>
PER SHARE OPERATING PERFORMANCE:
  Net asset value, beginning of period............     $10.00
                                                       ------
  Net investment income...........................       0.74
  Net realized and unrealized gain (loss).........      (0.01)
                                                       ------
  Total from investment operations................       0.73
                                                       ------
  Less dividends and distributions from:
    Net investment income.........................      (0.73)
    Net realized gain.............................         --
                                                       ------
Total dividends and distributions.................      (0.73)
                                                       ------
Net asset value, end of period....................     $10.00
                                                       ------
                                                       ------
TOTAL INVESTMENT RETURN+..........................       7.57%(1)
RATIOS TO AVERAGE NET ASSETS:
Expenses..........................................       1.48%(2)
Net investment income.............................       8.95%(2)
SUPPLEMENTAL DATA:
Net assets, end of period, in thousands...........   $328,189
Portfolio turnover rate...........................         35%(1)
</TABLE>
 
- ------------------------
 
<TABLE>
<S>  <C>
 *   COMMENCEMENT OF OPERATIONS.
 +   DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE. CALCULATED BASED ON THE NET
     ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
     DIVIDENDS AND DISTRIBUTIONS ARE ASSUMED TO BE REINVESTED AT THE PRICES
     OBTAINED UNDER THE TRUST'S DIVIDEND REINVESTMENT PLAN.
(1)  NOT ANNUALIZED.
(2)  ANNUALIZED.
</TABLE>
 
                       SEE NOTES TO FINANCIAL STATEMENTS
 
                                                                              49
<PAGE>
                                                                      APPENDIX A
HEDGING TRANSACTIONS
- --------------------------------------------------------------------------------
 
INTEREST RATE AND OTHER HEDGING TRANSACTIONS.  The Trust may in the future enter
into various interest rate hedging and risk management transactions; however, it
does not presently intend to engage in such transactions and will do so only
after providing 30 days' written notice to shareholders. If in the future the
Trust were to engage in such transactions, it expects to do so primarily to seek
to preserve a return on a particular investment or portion of its portfolio, and
may also enter into such transactions to seek to protect against decreases in
the anticipated rate of return on floating or variable rate financial
instruments the Trust owns or anticipates purchasing at a later date, or for
other risk management strategies such as managing the effective dollar-weighted
average duration of the Trust's portfolio. In addition, with respect to
fixed-income securities in the Trust's portfolio or to the extent an active
secondary market develops in interests in Senior Loans in which the Trust may
invest, the Trust may also engage in hedging transactions to seek to protect the
value of its portfolio against declines in net asset value resulting from
changes in interest rates or other market changes. The Trust will not engage in
any of the transactions for speculative purposes and will use them only as a
means to hedge or manage the risks associated with assets held in, or
anticipated to be purchased for, the Trust's portfolio or obligations incurred
by the Trust. The successful utilization of hedging and risk management
transactions requires skills different from those needed in the selection of the
Trust's portfolio securities. The Investment Advisor currently actively utilizes
various hedging techniques in connection with its management of other fixed
income portfolios and the Trust believes that the Investment Advisor possesses
the skills necessary for the successful utilization of hedging and risk
management transactions. The Trust will incur brokerage and other costs in
connection with its hedging transactions.
 
    The types of hedging transactions in which the Trust is most likely to
engage are interest rate swaps and the purchase or sale of interest rate caps or
floors. The Trust will not sell interest rate caps or floors that it does not
own. Interest rate swaps involve the exchange by the Trust with another party of
their respective obligations to pay or receive interest, e.g., an exchange of an
obligation to make floating rate payments for an obligation to make fixed rate
payments. The purchase of an interest rate cap entitles the Purchaser, to the
extent that a specified index exceeds a predetermined interest rate, to receive
payments of interest at the difference of the index and the predetermined rate
on a notional principal amount (the reference amount with respect to which
payment obligations are determined, although no actual exchange of principal
occurs) from the party selling such interest rate cap. The purchase of an
interest rate floor entitles the purchaser, to the extent that a specified index
falls below a predetermined interest rate, to receive payments of interest at
the difference of the index and the predetermined rate on a notional principal
amount from the party selling such interest rate floor.
 
    In circumstances in which the Investment Advisor anticipates that interest
rates will decline, the Trust might, for example, enter into an interest rate
swap as the floating rate payor. In the case where the Trust purchases such an
interest rate swap, if the floating rate payments fell below the level of the
fixed rate payment set in the swap agreement, the Trust's counterparty would pay
the Trust amounts equal to interest computed at the difference between the fixed
and floating rates over the notional principal amount. Such payments would
offset or partially offset the decrease in the payments the Trust would receive
in respect of floating rate assets being hedged. In the case of purchasing an
interest rate floor, if interest rates declined below the floor rate, the Trust
would receive payments from its counterparty which would wholly or partially
offset the decrease in the payments it would receive in respect of the financial
instruments being hedged.
 
    The successful use of swaps, caps and floors to preserve the rate of return
on a portfolio of financial instruments depends on the Investment Advisor's
ability to predict correctly the direction and degree of movements in interest
rates. Although the Trust believes that use of the hedging and risk management
techniques described above will benefit the Trust, if the Investment Advisor's
judgment about the direction or extent of the movement in interest rates is
incorrect, the Trust's overall performance would be worse than if it had not
entered into any such transactions. For example, if the Trust had purchased an
interest rate swap or an interest rate floor to hedge against its expectation
that interest rates would decline but instead interest rates rose, the Trust
would lose part or all of the benefit of the increased payments it would receive
as a result of the rising interest rates because it would have to pay amounts to
its counterparty under the swap agreement or would have paid the purchase price
of the interest rate floor.
 
    Any interest rate swaps entered into by the Trust would usually be done on a
net basis, i.e., where the two parties make net payments with the Trust
receiving or paying, as the case may be, only the net amount of the two
payments. Inasmuch as any such hedging transactions entered into by the Trust
will be for good-faith risk management purposes, the Investment Advisor and the
Trust believe such obligations do not constitute senior securities and,
accordingly, will not treat them as being subject to its investment restrictions
on borrowing. The net amount of the excess, if any, of the Trust's obligations
over its entitlements with respect to each interest rate swap will be accrued
and an amount of cash or liquid portfolio securities having an aggregate net
asset value at least equal to the accrued excess will be maintained in a
segregated account by the Trust's custodian.
 
50
<PAGE>
    The Trust will not enter into interest rate swaps, caps or floors if on a
net basis the aggregate notional principal amount with respect to such agreement
exceeds the net assets of the Trust. Thus, the Trust may enter into interest
rate swaps, caps or floors with respect to its entire portfolio.
 
    There is no limit on the amount of interest rate swap transactions that may
be entered into by the Trust. These transactions do not involve the delivery of
securities or other underlying assets or principal. Accordingly, the risk of
loss with respect to interest rate swaps is limited to the net amount of
interest payments that the Trust is contractually obligated to make. If the
other party to an interest rate swap defaults, the Trust's risk of loss consists
of the net amount of interest payments that the Trust contractually is entitled
to receive. The creditworthiness of firms with which the Trust enters into
interest rate swaps, caps or floors will be monitored on an ongoing basis by the
Investment Advisor pursuant to procedures adopted and reviewed, on an ongoing
basis, by the Board of Trustees of the Trust. If a default occurs by the other
party to such transaction, the Trust will have contractual remedies pursuant to
the agreements related to the transaction but such remedies may be subject to
bankruptcy and insolvency laws which could affect the Trust's rights as a
creditor. The swap market has grown substantially in recent years with a large
number of banks and investment banking firms acting both as principals and as
agents utilizing standardized swap documentation. As a result, the swap market
has become relatively liquid. Caps and floors are more recent innovations and
they are less liquid than swaps.
 
    The Trust is also authorized to enter into hedging transactions involving
financial futures and options, but presently believes it is unlikely that it
would enter into such transactions. The Trust may also invest in any new
financial products which may be developed to the extent determined by the Board
of Trustees to be consistent with its investment objective and otherwise in the
best interests of the Trust and its shareholders. The Trust will engage in such
transactions only to the extent permitted under applicable law and after
providing 30 days' written notice to shareholders.
 
                                                                              51
<PAGE>
Morgan Stanley Dean Witter Prime Income Trust
Two World Trade Center
New York, New York 10048
 
TRUSTEES
 
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John H. Haire
Wayne E. Hedien
Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
 
OFFICERS
 
Charles A. Fiumefreddo
Chairman and Chief Executive Officer
 
Barry Fink
Vice President, Secretary and
General Counsel
 
Rajesh K. Gupta
Vice President
 
Thomas F. Caloia
Treasurer
 
CUSTODIAN
 
The Bank of New York
90 Washington Street
New York, New York 10286
 
TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
 
Morgan Stanley Dean Witter Trust FSB
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311
 
INDEPENDENT ACCOUNTANTS
 
PricewaterhouseCoopers LLP
1177 Avenue of Americas
New York, New York 10036
 
INVESTMENT ADVISOR
 
Morgan Stanley Dean Witter Advisors Inc.
Two World Trade Center
New York, New York 10048
 
ADMINISTRATOR
 
Morgan Stanley Dean Witter Services Company Inc.
Two World Trade Center
New York, New York 10048
 
DISTRIBUTOR
 
Morgan Stanley Dean Witter Distributors Inc.
Two World Trade Center
New York, New York 10048


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