DEAN WITTER GLOBAL SHORT TERM INCOME FUND INC
497, 1998-02-13
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<PAGE>
                         DEAN WITTER
                         GLOBAL SHORT-TERM INCOME FUND
                         PROSPECTUS--FEBRUARY 10, 1998
 
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DEAN WITTER GLOBAL SHORT-TERM INCOME FUND INC. (THE "FUND") IS AN OPEN-END,
NON-DIVERSIFIED MANAGEMENT INVESTMENT COMPANY WHOSE INVESTMENT OBJECTIVE IS TO
ACHIEVE AS HIGH A LEVEL OF CURRENT INCOME AS IS CONSISTENT WITH PRUDENT
INVESTMENT RISK. THE FUND SEEKS TO ACHIEVE THIS OBJECTIVE BY INVESTING IN HIGH
QUALITY FIXED-INCOME SECURITIES ISSUED OR GUARANTEED BY THE U.S. GOVERNMENT, ITS
AGENCIES AND INSTRUMENTALITIES, ISSUED OR GUARANTEED BY FOREIGN GOVERNMENTS, OR
ISSUED BY FOREIGN OR U.S. COMPANIES (INCLUDING BANK INSTRUMENTS AND COMMERCIAL
PAPER), WHICH HAVE REMAINING MATURITIES AT THE TIME OF PURCHASE OF NOT MORE THAN
THREE YEARS. THE FUND IS DESIGNED FOR THE INVESTOR WHO SEEKS A HIGHER YIELD THAN
A MONEY MARKET FUND AND LESS FLUCTUATION IN NET ASSET VALUE THAN A LONGER-TERM
BOND FUND.
 
Shares of the Fund are continuously offered at net asset value. However,
redemptions and/or repurchases are subject in most cases to a contingent
deferred sales charge, scaled down from 3% to 1% of the amount redeemed, if made
within three years of purchase, which charge will be paid to the Fund's
Distributor, Dean Witter Distributors Inc. See "Redemptions and
Repurchases--Contingent Deferred Sales Charge." In addition, the Fund pays the
Distributor a distribution fee pursuant to a Plan of Distribution at the annual
rate of 0.75% of the lesser of the (i) average daily aggregate net sales or (ii)
average daily net assets of the Fund. See "Purchase of Fund Shares--Plan of
Distribution."
 
This Prospectus sets forth concisely the information you should know before
investing in the Fund. It should be read and retained for future reference.
Additional information about the Fund is contained in the Statement of
Additional Information, dated February 10, 1998, which has been filed with the
Securities and Exchange Commission, and which is available at no charge upon
request of the Fund at the address or telephone number listed on this page. The
Statement of Additional Information is incorporated herein by reference.
 
<TABLE>
<CAPTION>
TABLE OF CONTENTS
 
<S>                                                 <C>
Prospectus Summary................................       2
 
Summary of Fund Expenses..........................       3
 
Financial Highlights..............................       4
 
The Fund and its Management.......................       5
 
Investment Objective and Policies.................       5
 
   Risk Considerations............................       7
 
Investment Restrictions...........................      13
 
Purchase of Fund Shares...........................      13
 
Shareholder Services..............................      15
 
Redemptions and Repurchases.......................      17
 
Dividends, Distributions and Taxes................      19
 
Performance Information...........................      20
 
Additional Information............................      20
</TABLE>
 
SHARES OF THE FUND ARE NOT DEPOSITS OR OBLIGATIONS OF, OR GUARANTEED OR ENDORSED
BY, ANY BANK, AND THE SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL DEPOSIT
INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD, OR ANY OTHER AGENCY.
 
DEAN WITTER
GLOBAL SHORT-TERM INCOME FUND INC.
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
(212) 392-2550 or (800) 869-NEWS (toll-free)
 
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  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
 
                   DEAN WITTER DISTRIBUTORS INC., DISTRIBUTOR
<PAGE>
PROSPECTUS SUMMARY
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<TABLE>
<S>             <C>
THE FUND        The Fund is an open-end, non-diversified management investment company investing in high
                quality fixed-income securities issued or guaranteed by the U.S. Government, its
                agencies and instrumentalities, issued or guaranteed by foreign governments, or issued
                by foreign or U.S. companies, which have remaining maturities at the time of purchase of
                not more than three years.
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SHARES OFFERED  Shares of common stock of $0.01 par value (see page 20).
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OFFERING PRICE  At net asset value without sales charge (see page 13). Shares redeemed within three
                years of purchase are subject to a contingent deferred sales charge under most
                circumstances (see page 17).
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MINIMUM         Minimum initial investment, $1,000 ($100 if account is opened through EasyInvest-SM-);
PURCHASE        minimum subsequent investment, $100 (see page 13).
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INVESTMENT      The investment objective of the Fund is to achieve as high a level of current income as
OBJECTIVE       is consistent with prudent investment risk (see page 5).
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INVESTMENT      Dean Witter InterCapital Inc. ("InterCapital"), the Investment Manager of the Fund and
MANAGER         its wholly-owned subsidiary, Dean Witter Services Company Inc., serve in various
                investment management, advisory, management and administrative capacities to 103
                investment companies and other portfolios with assets under management of approximately
                $102.9 billion at December 31, 1997 (see page 5).
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MANAGEMENT FEE  The Investment Manager receives a monthly fee at the annual rate of 0.55% of the Fund's
                daily net assets not exceeding $500 million and 0.50% of the Fund's daily net assets on
                the amount exceeding $500 million (see page 5).
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DIVIDENDS AND   Dividends from net investment income are declared daily and paid monthly. Distributions
DISTRIBUTIONS   from net short- term and long-term capital gains are paid at least once per year (may be
                retained for reinvestment). Dividends and capital gains distributions are automatically
                reinvested in additional shares at net asset value unless the shareholder elects to
                receive cash (see page 19).
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DISTRIBUTOR     Dean Witter Distributors Inc. (the "Distributor"). For its services as Distributor,
                which include payment of sales commissions to account executives and various other
                promotional and sales related expenses, the Distributor receives from the Fund a
                distribution fee accrued daily and payable monthly at the rate of 0.75% per annum of the
                lesser of (i) the Fund's average daily aggregate net sales or (ii) the Fund's average
                daily net assets. This fee compensates the Distributor for the services it provides in
                distributing shares of the Fund and for its sales related expenses. The Distributor also
                receives the proceeds of any contingent deferred sales charges (see page 14).
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REDEMPTION--    At net asset value; redeemable involuntarily if total value of the account is less than
CONTINGENT      $100 or, if the account was opened through EasyInvest, if after twelve months the
DEFERRED SALES  shareholder has invested less than $1,000 in the account. Although no commission or
CHARGE          sales load is imposed upon the purchase of shares, a contingent deferred sales charge
                (scaled down from 3% to 1%) is imposed on any redemption of shares if, after such
                redemption, the aggregate current value of an account with the Fund falls below the
                aggregate amount of the investor's purchase payments made during the three years
                preceding the redemption. However, there is no charge imposed on redemption of shares
                purchased through reinvestment of dividends or distributions (see page 17).
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SPECIAL RISK    The net asset value of the Fund's shares will fluctuate with changes in the market value
CONSIDERATIONS  of its portfolio securities. It should be noted, for example, that, generally, when the
                level of prevailing interest rates rises, the values of the outstanding fixed-income
                securities fall and when such rates fall their values rise. The Fund is a
                non-diversified investment company and, as such, is not subject to the diversification
                requirements of the Investment Company Act of 1940, as amended (the "Act") (see page 8).
                The Fund will concentrate its investments in securities issued by companies engaged in
                the banking industry. This concentration will increase the Fund's exposure to certain
                risks associated with the banking industry such as adverse changes in economic and
                regulatory developments affecting the banking industry, sustained interest rate
                increases and concentration of a bank's loan portfolios in particular businesses
                undergoing economic hardship (see page 7). It should be recognized that the foreign
                securities and markets in which the Fund will invest pose different and greater risks
                than those customarily associated with domestic securities and their markets.
                Furthermore, investors should consider other risks associated with a portfolio of
                international securities, including fluctuations in foreign currency exchange rates
                (i.e., if a substantial portion of the Fund's assets are denominated in foreign
                currencies which decrease in value with respect to the U.S. dollar, the value of the
                investor's shares and the distributions made on those shares will, likewise, decrease in
                value), foreign securities exchange controls and foreign tax rates, as well as
                investments in forward foreign currency contracts, options and futures contracts (see
                pages 7-12). The Fund may also invest in fixed-income securities which may be
                denominated in a currency of a nation other than the nation in which the issuer of such
                fixed-income securities is domiciled.
</TABLE>
 
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  THE ABOVE IS QUALIFIED IN ITS ENTIRETY BY THE DETAILED INFORMATION APPEARING
              ELSEWHERE IN THIS PROSPECTUS AND IN THE STATEMENT OF
                            ADDITIONAL INFORMATION.
 
2
<PAGE>
SUMMARY OF FUND EXPENSES
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The following table illustrates all expenses and fees that a shareholder of the
Fund will incur. The expenses and fees set forth in the table are for the fiscal
year ended October 31, 1997.
 
<TABLE>
<CAPTION>
SHAREHOLDER TRANSACTION EXPENSES
<S>                                                 <C>
Maximum Sales Charge Imposed on Purchases.........   None
Maximum Sales Charge Imposed on Reinvested
 Dividends........................................   None
Deferred Sales Charge
 (as a percentage of the lesser of original
 purchase price or redemption proceeds)...........   3.0%
</TABLE>
 
 A contingent deferred sales charge is imposed at the following declining rates:
 
<TABLE>
<CAPTION>
YEAR SINCE PURCHASE PAYMENT MADE                    PERCENTAGE
- --------------------------------------------------  -----------
<S>                                                 <C>
First.............................................      3.0%
Second............................................      2.0%
Third.............................................      1.0%
Fourth and thereafter.............................     None
</TABLE>
 
<TABLE>
<S>                                                 <C>
Redemption Fees...................................   None
Exchange Fee......................................   None
 
ANNUAL FUND OPERATING EXPENSES (AS A PERCENTAGE OF
 AVERAGE NET ASSETS)
Management Fees...................................  0.55%
12b-1 Fees*.......................................  0.75%
Other Expenses....................................  0.49%
Total Fund Operating Expenses.....................  1.79%
</TABLE>
 
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* A PORTION OF THE 12b-1 FEE EQUAL TO 0.25% OF THE FUND'S AVERAGE DAILY NET
  ASSETS IS CHARACTERIZED AS A SERVICE FEE WITHIN THE MEANING OF NATIONAL
  ASSOCIATION OF SECURITIES DEALERS, INC. ("NASD") GUIDELINES (SEE "PURCHASE OF
  FUND SHARES").
 
<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) redemption at the end
 of each time period:.......................................   $      48    $      66    $      97    $     211
You would pay the following expenses on the same investment,
 assuming no redemption:....................................   $      18    $      56    $      97    $     211
</TABLE>
 
THE ABOVE EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE
EXPENSES OR PERFORMANCE. ACTUAL EXPENSES OF THE FUND MAY BE GREATER OR LESS THAN
THOSE SHOWN.
 
The purpose of this table is to assist the investor in understanding the various
costs and expenses that an investor in the Fund will bear directly or
indirectly. For a more complete description of these costs and expenses, see
"The Fund and Its Management," "Plan of Distribution" and "Redemptions and
Repurchases."
 
Long-term shareholders of the Fund may pay more in sales charges and
distribution fees than the economic equivalent of the maximum front-end sales
charges permitted by the NASD.
 
                                                                               3
<PAGE>
FINANCIAL HIGHLIGHTS
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The following per share data and ratios for a share of capital stock outstanding
throughout each period have been audited by Price Waterhouse LLP, independent
accountants. The per share data and ratios should be read in conjunction with
the financial statements and the notes thereto and the unqualified report of
independent accountants which are contained in the Statement of Additional
Information. Further information about the performance of the Fund is contained
in the Fund's Annual Report to Shareholders, which may be obtained without
charge upon request to the Fund.
 
<TABLE>
<CAPTION>
                                                              FOR THE YEAR ENDED OCTOBER 31,
                                     ---------------------------------------------------------------------------------
                                       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............................  $    9.44   $    8.89   $    8.73   $    9.23   $    9.41   $    9.77   $   10.00
                                     ---------   ---------   ---------   ---------   ---------   ---------   ---------
  Net investment income............       0.52        0.61        0.54        0.72        0.70        0.82        0.95
  Net realized and unrealized gain
   (loss)..........................      (0.08)       0.48        0.16       (0.66)      (0.27)      (0.46)      (0.23)
                                     ---------   ---------   ---------   ---------   ---------   ---------   ---------
  Total from investment
   operations......................       0.44        1.09        0.70        0.06        0.43        0.36        0.72
                                     ---------   ---------   ---------   ---------   ---------   ---------   ---------
  Less dividends and distributions
   from:
    Net investment income..........      (1.06)      (0.54)      (0.44)      (0.13)      (0.61)      (0.72)      (0.95)
    Paid-in-capital................     --          --           (0.10)      (0.43)     --          --          --
                                     ---------   ---------   ---------   ---------   ---------   ---------   ---------
  Total dividends and
   distributions...................      (1.06)      (0.54)      (0.54)      (0.56)      (0.61)      (0.72)      (0.95)
                                     ---------   ---------   ---------   ---------   ---------   ---------   ---------
  Net asset value, end of period...  $    8.82   $    9.44   $    8.89   $    8.73   $    9.23   $    9.41   $    9.77
                                     ---------   ---------   ---------   ---------   ---------   ---------   ---------
                                     ---------   ---------   ---------   ---------   ---------   ---------   ---------
TOTAL INVESTMENT RETURN+...........       4.88%      12.66%       8.27%       0.65%       4.72%       3.76%       7.49%
RATIOS TO AVERAGE NET ASSETS:
    Expenses.......................       1.79%       1.66%       1.68%       1.63%       1.55%       1.55%       1.61%
    Net investment income..........       5.85%       6.57%       6.17%       6.35%       6.97%       8.43%       9.49%
SUPPLEMENTAL DATA:
  Net assets, end of period, in
   thousands.......................    $61,378     $80,625    $106,939    $170,117    $305,278    $441,191    $462,263
  Portfolio turnover rate..........        264%        138%        188%        123%        221%        149%          8%
</TABLE>
 
- -------------
+ DOES NOT REFLECT THE DEDUCTION OF SALES CHARGE. CALCULATED BASED ON THE NET
  ASSET VALUE AS OF THE LAST BUSINESS DAY OF THE PERIOD.
 
4
<PAGE>
THE FUND AND ITS MANAGEMENT
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Dean Witter Global Short-Term Income Fund Inc. (the "Fund") is an open-end,
non-diversified management investment company incorporated in the state of
Maryland on August 2, 1990.
 
    Dean Witter InterCapital Inc. ("InterCapital" or the "Investment Manager"),
whose address is Two World Trade Center, New York, New York 10048, is the Fund's
Investment Manager. The Investment Manager, which was incorporated in July,
1992, is a wholly-owned subsidiary of Morgan Stanley, Dean Witter, Discover &
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.
 
    InterCapital and its wholly-owned subsidiary, Dean Witter Services Company
Inc., serve in various investment management, advisory, management and
administrative capacities to 103 investment companies, 29 of which are listed on
the New York Stock Exchange, with combined total assets of approximately $98.9
billion at December 31, 1997. The Investment Manager also manages and advises
portfolios of pension plans, other institutions and individuals which aggregated
approximately $4 billion at such date.
 
    The Fund has retained the Investment Manager to provide administrative
services, manage its business affairs and manage the investment of the Fund's
assets, including the placing of orders for the purchase and sale of portfolio
securities. InterCapital has retained Dean Witter Services Company Inc. to
perform the aforementioned administrative services for the Fund.
 
    The Fund's Directors review the various services provided by or under the
direction of the Investment Manager to ensure that the Fund's general investment
policies and programs are being properly carried out and that administrative
services are being provided to the Fund in a satisfactory manner.
 
    As full compensation for the services and facilities furnished to the Fund
and for expenses of the Fund assumed by the Investment Manager, the Fund pays
the Investment Manager monthly compensation calculated daily by applying the
annual rate of 0.55% to the Fund's net assets not exceeding $500 million and
0.50% to the Fund's net assets exceeding $500 million. For the fiscal year ended
October 31, 1997, the Fund accrued total compensation to the Investment Manager
amounting to 0.55% of the Fund's average daily net assets and the Fund's total
expenses amounted to 1.79% of the Fund's average daily net assets.
 
INVESTMENT OBJECTIVE AND POLICIES
- --------------------------------------------------------------------------------
 
The investment objective of the Fund is to achieve as high a level of current
income as is consistent with prudent investment risk. There is no assurance that
the objective will be achieved. The investment objective is a fundamental policy
of the Fund and cannot be changed without the approval of the shareholders of
the Fund. The following policies may be changed by the Board of Directors
without shareholder approval.
 
    The Fund seeks to achieve its investment objective by investing at least 65%
of its total assets in high quality fixed-income securities issued or guaranteed
by foreign governments, issued by foreign or U.S. companies, or issued or
guaranteed by the U.S. Government, its agencies and instrumentalities which have
remaining maturities at the time of purchase of not more than three years (i.e.,
the average weighted maturity of the Fund's portfolio will be under three
years). In addition to securities issued by the U.S. Government, its agencies
and instrumentalities, the Fund may invest in obligations issued or guaranteed
by a foreign government or any of its political subdivisions, authorities,
agencies or instrumentalities, or by supranational organizations, or
fixed-income securities issued by a corporation, all of which are rated AAA or
AA by Standard & Poor's Corporation ("S&P") or Aaa or Aa by Moody's Investors
Services, Inc. ("Moody's") or, if unrated, are determined by the Investment
Manager to be of equivalent quality; in certificates of deposit and bankers'
acceptances issued or guaranteed by, or time deposits maintained at, banks
(including foreign branches of U.S. banks or U.S. or foreign branches of foreign
banks) having total assets of more than $500 million and deemed by the
Investment Manager to be of high creditworthiness; and commercial paper rated
A-1 or A-2 by S&P, Prime-1 or Prime-2 by Moody's or Duff 1 or Duff 2 by Duff &
Phelps Inc. or, if unrated, issued by U.S. or foreign companies having
outstanding debt securities rated A or higher by S&P or Moody's and in loan
participation interests having a remaining term not exceeding one year in loans
extended by banks to such companies. The Fund will have at least 65% of its
total assets invested in fixed-income securities, as described above, of issuers
located in at least three different countries.
 
    Certain foreign securities purchased by the Fund will not have received
ratings by a recognized U.S. rating agency. In such cases the Investment Manager
will review the issuers of such securities with respect to the quality of their
management, balance sheet and financial ratios, cash flows and earnings to
establish that the securities purchased by the Fund are of a comparable quality
to issuers receiving high quality ratings by a recognized U.S. rating agency.
 
                                                                               5
<PAGE>
    In attempting to achieve its investment objective, the Investment Manager
will actively manage the Fund's assets in accordance with a global market
strategy which seeks to exploit spreads among short-term instruments worldwide.
As such, the Fund may experience high portfolio turnover rates (see "Portfolio
Management," page 12). Consistent with such a strategy, the Investment Manager
intends to allocate the Fund's investments among securities denominated in the
currencies of a number of foreign countries and, within each such country, among
different types of debt securities. The Investment Manager will adjust the
Fund's exposure to different currencies based on its perception of the most
favorable markets and issuers. In allocating the Fund's assets among various
markets, the Investment Manager will assess the relative yield and anticipated
direction of interest rates in particular markets, the level of inflation,
liquidity and financial soundness of each market, and the general market and
economic conditions existing in each market as well as the relationship of
currencies of various countries to the U.S. dollar and to each other. In its
evaluations, the Investment Manager will utilize its internal financial,
economic and credit analysis resources as well as information obtained from
other sources.
 
    Under normal conditions, a significant percentage of the short-term
investments in the Fund's portfolio may be money market securities. Money market
securities include short-term obligations issued or guaranteed by the U.S.
Government or foreign governments issued by such governments' respective
agencies and instrumentalities, bank money market instruments including
certificates of deposit, bankers' acceptances, time deposits and deposit notes
and certain other short-term obligations such as short-term commercial paper.
With respect to bank money instruments, the obligations may be issued by U.S. or
foreign depository institutions, foreign branches or subsidiaries of U.S.
depository institutions ("Eurodollar" obligations), U.S. branches or
subsidiaries of foreign depository institutions ("Yankeedollar" obligations) or
foreign branches or subsidiaries of foreign depository institutions. Eurodollar
and Yankeedollar obligations and obligations of branches or subsidiaries of
foreign depository institutions may be general obligations of the parent bank or
may be limited to the issuing branch or subsidiary by the terms of the specific
obligations or by government regulation.
 
    The Fund will invest at least 25% of its assets in securities issued by
issuers located in the U.S. As such, the Fund will have a greater exposure than
other "global" mutual funds to economic and political events occurring in the
U.S. Changes in prevailing U.S. interest rates, federal tax rate increases, or
adverse changes in federal or state regulations or exchange rules may all have a
disproportionate impact upon the Fund as a result of its concentration policy.
Moreover, the Fund's concentration in securities of U.S. issuers will mean that
the Fund's investments are more likely to be responsive, both positively and
negatively, to declines or advances in the U.S. dollar with respect to foreign
currencies.
 
    A substantial portion of the Fund's investments in securities of U.S.
issuers are likely to be in commercial paper, bankers acceptances and other
short-term debt instruments issued by U.S. corporations. However, at times
during which there exists large-scale political or economic uncertainty, the
Fund is likely to increase its investments in U.S. government securities. In
such cases, the securities which the Fund is most likely to purchase are U.S.
Treasury bills and U.S. Treasury notes with remaining maturities of under three
years, both of which are direct obligations of the U.S. Government. The Fund may
also purchase securities issued by various agencies and instrumentalities of the
U.S. Government. These will include obligations backed by the full faith and
credit of the United States (such as those issued by the Government National
Mortgage Association); obligations whose issuing agency or instrumentality has
the right to borrow, to meet its obligations, from an existing line of credit
with the U.S. Treasury (such as those issued by the Federal National Mortgage
Association); and obligations backed by the credit of the issuing agency or
instrumentality (such as those issued by the Federal Farm Credit System).
 
    The securities in which the Fund will be investing may be denominated in any
currency or multinational currency. Under normal circumstances, the Fund will
invest its assets in securities denominated in at least three different
currencies, including the U.S. dollar. In addition to the U.S. dollar, such
currencies will include, among others: the Australian dollar; Deutsche mark;
Japanese yen; French franc; British pound; Canadian dollar; Swiss franc; Italian
Lira; Dutch guilder; Austrian schilling; Spanish Peseta; Swedish Krona; Mexican
peso; Thai bhat; and European Currency Unit ("ECU"). The Fund will not invest
more than 25% of its total assets in securities denominated in a single currency
or currency unit with the exception of the U.S. dollar.
 
    The Fund may invest without limitation in notes and commercial paper, the
principal amount of which is indexed to certain specific foreign currency
exchange rates. Indexed notes and commercial paper typically provide that their
principal amount is adjusted upwards or downwards (but not below zero) at
maturity to reflect fluctuations in the exchange rate between two currencies
during the period the obligation is outstanding, depending on the terms of the
specific security. In selecting the two currencies, the Investment Manager will
consider the correlation and relative yields of various currencies. The Fund
will purchase an indexed obligation using the currency in which it is
denominated and, at maturity, will receive interest and principal payments
thereon in that currency. The amount of principal payable by the issuer at
maturity, however, will vary (i.e., increase or decrease) in response to the
change (if any) in the exchange rates between the two specified currencies
during the period from the date the instrument is issued to its maturity date.
The potential for realizing gains
 
6
<PAGE>
as a result of changes in foreign currency exchange rates may enable the Fund to
hedge the currency in which the obligation is denominated (or to effect
cross-hedges against other currencies) against a decline in the U.S. dollar
value of investments denominated in foreign currencies, while providing an
attractive money market rate of return. The Fund will purchase such indexed
obligations to generate current income or for hedging purposes and will not
speculate in such obligations.
 
    Under normal circumstances, the Fund will invest at least 25% of its total
assets in debt instruments issued by U.S. and foreign companies engaged in the
banking industry, including bank holding companies. Such investments may include
certificates of deposit, time deposits, bankers' acceptances, and obligations
issued by bank holding companies, as well as repurchase agreements entered into
with banks. For temporary defensive purposes, however, the Fund may reduce its
investments in the banking industry to less than 25% of its total assets. The
Fund's policy as to concentrating its investments in the banking industry is
fundamental and may not be changed without the approval of a majority of the
Fund's voting securities.
 
    The Fund's policy of concentrating its investments in the banking industry
will cause the Fund to have greater exposure to certain risks associated with
the banking industry. In particular, economic or regulatory developments in or
related to the banking industry will affect the value of and investment return
on the Fund's shares. Sustained increases in interest rates may adversely affect
the availability and cost of funds for a bank's lending activities;
deterioration in general economic conditions may increase a bank's exposure to
credit losses. The banking industry also is subject to the effects of the
concentration of loan portfolios in particular businesses that may be adversely
affected by economic conditions, such as real estate, energy, agriculture or
high technology-related companies. In addition, the banking industry is subject
to national and local regulation and competition among banks as well as with
other types of financial institutions. Also, the Fund's investments in
commercial banks located in several foreign countries are subject to additional
risks due to the combination in such banks of commercial banking and diversified
securities activities. As discussed above, however, the Fund will seek to
minimize its exposure to such risks by investing only in debt securities which
are determined by the Investment Manager, acting under the general supervision
of the Board of Directors, to be high quality.
 
    As indicated above, the Fund may invest in securities denominated in a
multi-national currency unit. An illustration of a multi-national currency unit
is the ECU, which is a "basket" consisting of specified amounts of the
currencies of the member states of the European Community, a Western European
economic cooperative organization that includes France, Germany, The Netherlands
and the United Kingdom. The specific amounts of currencies comprising the ECU
may be adjusted by the Council of Ministers of the European Community to reflect
changes in relative values of the underlying currencies. The Investment Manager
does not believe that such adjustments will adversely affect holders of
ECU-denominated obligations or the marketability of such securities. European
supranational entities, in particular, issue ECU-denominated obligations. The
Fund may invest in securities denominated in the currency of one nation although
issued by a governmental entity, corporation or financial institution of another
nation. For example, the Fund may invest in a British pound-denominated
obligation issued by a United States corporation. Such investments involve
credit risks associated with the issuer and currency risks associated with the
currency in which the obligation is denominated.
 
    The Fund also may invest in bonds and notes backed by pools of mortgage,
credit card, automobile or other types of receivables with remaining maturities
of three years or less. These structured financings will be supported by
sufficient collateral, and other credit enhancements, including letters of
credit, insurance, reserve funds and guarantees by third parties, to enable such
instruments to obtain a high quality rating by a nationally recognized
statistical rating agency or be of comparable quality as determined by the
Investment Manager. Generally, the issuers of mortgage-backed and
receivable-backed bonds, notes or pass-through certificates are special purpose
entities and do not have any significant assets other than the assets securing
such obligations. Such special-purpose entities are typically created by the
underwriters of such securities or the entity to which the receivables are
payable.
 
    Instruments backed by pools of mortgages and receivables may be subject to
unscheduled prepayments of principal prior to maturity. When the obligations are
prepaid, the Fund must reinvest the prepaid amounts in securities the yields of
which reflect interest rates prevailing at the time. Therefore, the Fund's
ability to maintain a portfolio which includes high-yielding asset-backed
securities will be adversely affected to the extent that pre-payments of
principal must be reinvested in securities which have lower yields than the
prepaid obligations. Moreover, prepayments of securities purchased at a premium
could result in a realized loss. In addition, certain asset-backed and
receivable-backed securities may be illiquid. As such, the Fund may be limited
in its ability to invest in such securities (see Investment Restriction Number 3
on page 13).
 
RISK CONSIDERATIONS
 
The net asset value of the Fund's shares will fluctuate with changes in the
market value of its portfolio securities. The market value of the Fund's
portfolio securities will increase or decrease due to a variety of economic,
market or political factors which cannot be predicted. The Fund's yield will
also vary based on the yield of the Fund's portfolio securities.
 
                                                                               7
<PAGE>
    All fixed-income securities are subject to two types of risks: the credit
risk and the interest rate risk. The credit risk relates to the ability of the
issuer to meet interest or principal payments or both as they come due. The
interest rate risk refers to the fluctuations in the net asset value of any
portfolio of fixed-income securities resulting from the inverse relationship
between price and yield of fixed-income securities; that is, when the general
level of interest rates rises, the prices of outstanding fixed-income securities
decline, and when interest rates fall, prices rise.
 
NON-DIVERSIFIED STATUS.  The Fund is a non-diversified investment company and,
as such, is not subject to the diversification requirements of the Act. As a
non-diversified investment company, the Fund may invest a greater portion of its
assets in the securities of a single issuer and thus is subject to greater
exposure to risks such as a decline in the credit rating of that issuer.
However, the Fund has in the past qualified and anticipates that it will qualify
in the future as a regulated investment company under the federal income tax
laws and, to the extent so qualified, is subject to the applicable
diversification requirements of the Internal Revenue Code, as amended (the
"Code"). As a regulated investment company under the Code, the Fund may not, as
of the end of any of its fiscal quarters, have invested more than 25% of its
total assets in the securities of any one issuer (including a foreign
government), or as to 50% of its total assets, have invested more than 5% of its
total assets in the securities of a single issuer.
 
FOREIGN SECURITIES.  Investors should carefully consider the risks of investing
in securities of foreign issuers and securities denominated in non-U.S.
currencies. Fluctuations in the relative rates of exchange between the
currencies of different nations will affect the value of the Fund's investments.
Changes in foreign currency exchange rates relative to the U.S. dollar will
affect the U.S. dollar value of the Fund's assets denominated in that currency
and thereby impact upon the Fund's yield on such assets and the net asset value
of a share of the Fund as well as the amount of the Fund's distributions. For
example, if a substantial portion of the Fund's assets is denominated in
Japanese yen and the relative exchange rate of the yen falls with respect to the
U.S. dollar (i.e., a yen is worth a smaller fraction of a dollar than it had
been) then the Fund will be receiving a lesser amount of interest on its
fixed-income securities denominated in yen (when converted into U.S. dollars)
and when the Fund's assets are valued for purposes of determining the net asset
value per share of the Fund, the net assets of the Fund reflected by the
yen-denominated securities will have declined in U.S. dollar value and the net
asset value of the Fund (always stated in U.S. dollars) may have also declined.
 
    Foreign currency exchange rates are determined by forces of supply and
demand on the foreign exchange markets. These forces are themselves affected by
the international balance of payments and other economic and financial
conditions, government intervention, speculation and other factors. Moreover,
foreign currency exchange rates may be affected by the regulatory control of the
exchanges on which the currencies trade. The foreign currency transactions of
the Fund will be conducted on a spot basis or through forward contracts or
futures contracts (see below). The Fund may incur certain costs in connection
with these currency transactions.
 
    Investments in foreign securities will also occasion risks relating to
political and economic developments abroad, including the possibility of
expropriations or confiscatory taxation, limitations on the use or transfer of
Fund assets and any effects of foreign social, economic or political
instability. Foreign companies are not subject to the regulatory requirements of
U.S. companies and, as such, there may be less publicly available information
about such companies. Moreover, foreign companies are not subject to uniform
accounting, auditing and financial standards and requirements comparable to
those applicable to U.S. companies.
 
    Securities of foreign issuers may be less liquid than comparable securities
of U.S. issuers and, as such, their price changes may be more volatile.
Furthermore, foreign exchanges and broker-dealers are generally subject to less
government and exchange scrutiny and regulation than their American
counterparts. Brokerage commissions, dealer concessions and other transaction
costs may be higher on foreign markets than in the U.S. In addition, differences
in clearance and settlement procedures on foreign markets may occasion delays in
settlements of Fund trades effected in such markets. Inability to dispose of
portfolio securities due to settlement delays could result in losses to the Fund
due to subsequent declines in value of such securities and the inability of the
Fund to make intended security purchases due to settlement problems could result
in a failure of the Fund to make potentially advantageous investments.
                                  ------------
 
    To hedge against adverse price movements in the securities held in its
portfolio and the currencies in which they are denominated (as well as in the
securities it might wish to purchase and their denominated currencies) the Fund
may engage in transactions in forward foreign currency contracts, options on
securities and currencies, and futures contracts and options on futures
contracts on securities, currencies and indexes. The Fund may also purchase
options on securities to facilitate its participation in the potential
appreciation of the value of the underlying securities. A discussion of these
transactions follows and is supplemented by further disclosure in the Statement
of Additional Information.
 
FORWARD FOREIGN CURRENCY EXCHANGE CONTRACTS.  A forward foreign currency
exchange contract ("forward contract") involves an obligation to purchase or
sell a currency at a future date, which may be any fixed number of days from the
date of the contract agreed upon by the parties, at a price set at the time of
the contract. The Fund may enter
 
8
<PAGE>
into forward contracts as a hedge against fluctuations in future foreign
exchange rates.
 
    The Fund will enter into forward contracts under various circumstances. When
the Fund enters into a contract for the purchase or sale of a security
denominated in a foreign currency, it may, for example, desire to "lock in" the
price of the security in U.S. dollars or some other foreign currency which the
Fund is temporarily holding in its portfolio. By entering into a forward
contract for the purchase or sale, for a fixed amount of dollars or other
currency, of the amount of foreign currency involved in the underlying security
transactions, the Fund will be able to protect itself against a possible loss
resulting from an adverse change in the relationship between the U.S. dollar or
other currency which is being used for the security purchase and the foreign
currency in which the security is denominated during the period between the date
on which the security is purchased or sold and the date on which payment is made
or received.
 
    At other times, when, for example, the Fund's Investment Manager believes
that the currency of a particular foreign country may suffer a substantial
decline against the U.S. dollar or some other foreign currency, the Fund may
enter into a forward contract to sell, for a fixed amount of dollars or other
currency, the amount of foreign currency approximating the value of some or all
of the Fund's portfolio securities (or securities which the Fund has purchased
for its portfolio) denominated in such foreign currency. Under identical
circumstances, the Fund may enter into a forward contract to sell, for a fixed
amount of U.S. dollars or other currency, an amount of foreign currency other
than the currency in which the securities to be hedged are denominated
approximating the value of some or all of the portfolio securities to be hedged.
This method of hedging, called "cross-hedging," will be selected by the
Investment Manager when it is determined that the foreign currency in which the
portfolio securities are denominated has insufficient liquidity or is trading at
a discount as compared with some other foreign currency with which it tends to
move in tandem.
 
    In addition, when the Fund's Investment Manager anticipates purchasing
securities at some time in the future, and wishes to lock in the current
exchange rate of the currency in which those securities are denominated against
the U.S. dollar or some other foreign currency, the Fund may enter into a
forward contract to purchase an amount of currency equal to some or all of the
value of the anticipated purchase, for a fixed amount of U.S. dollars or other
currency. The Fund may, however, close out the forward contract without
purchasing the security which was the subject of the "anticipatory" hedge.
 
    Lastly, the Fund is permitted to enter into forward contracts with respect
to currencies in which certain of its portfolio securities are denominated and
on which options have been written (see "Options and Futures Transactions").
 
    In all of the above circumstances, if the currency in which the Fund's
portfolio securities (or anticipated portfolio securities) are denominated rises
in value with respect to the currency which is being purchased (or sold), then
the Fund will have realized fewer gains than had the Fund not entered into the
forward contracts. Moreover, the precise matching of the forward contract
amounts and the value of the securities involved will not generally be possible,
since the future value of such securities in foreign currencies will change as a
consequence of market movements in the value of those securities between the
date the forward contract is entered into and the date it matures. The Fund is
not required to enter into such transactions with regard to its foreign
currency-denominated securities and will not do so unless deemed appropriate by
the Investment Manager.
 
    The Fund generally will not enter into a forward contract with a term of
greater than one year, although it may enter into forward contracts for periods
of up to five years. To the extent that the Fund enters into forward foreign
currency contracts to hedge against a decline in the value of portfolio holdings
denominated in a particular foreign currency resulting from currency
fluctuations, there is a risk that the Fund may nevertheless realize a gain or
loss as a result of currency fluctuations after such portfolio holdings are sold
if the Fund is unable to enter into an "offsetting" forward foreign currency
contract with the same party or another party. The Fund may be limited in its
ability to enter into hedging transactions involving forward contracts by the
Code requirements relating to qualifications as a regulated investment company
(see "Dividends, Distributions and Taxes").
 
OPTIONS AND FUTURES TRANSACTIONS.  The Fund may purchase and sell (write) call
and put options on U.S. Treasury notes, bonds and bills and on various foreign
currencies which are listed on several U.S. and foreign securities exchanges or
are written in over-the-counter transactions ("OTC Options"). Listed options are
issued or guaranteed by the exchange on which they trade or by a clearing
corporation such as the Options Clearing Corporation ("OCC"). Ownership of a
listed call option gives the Fund the right to buy from the OCC (in the U.S.) or
other clearing corporation or exchange, the underlying security or currency
covered by the option at the stated exercise price (the price per unit of the
underlying security or currency) by filing an exercise notice prior to the
expiration date of the option. Ownership of a listed put option would give the
Fund the right to sell the underlying security or currency to the OCC (in the
U.S.) or other clearing corporation or exchange at the stated exercise price.
OTC options are purchased from or sold (written) to dealers or financial
institutions which have entered into direct agreements with the Fund. With OTC
options, such variables as expiration date, exercise price and premium will be
agreed upon between the Fund and the transacting dealer, without the
intermediation of a third party such as the OCC.
 
                                                                               9
<PAGE>
COVERED CALL WRITING.  The Fund is permitted to write covered call options on
portfolio securities which are denominated in either U.S. dollars or foreign
currencies and on the U.S. dollar and foreign currencies, without limit, in
order to hedge against the decline in the value of a security or currency in
which such security is denominated and to close out long call option positions.
As a writer of a call option, the Fund has the obligation, upon notice of
exercise of the option, to deliver the security or amount of currency underlying
the option (certain listed and OTC call options written by the Fund will be
exercisable by the purchaser only on a specific date).
 
COVERED PUT WRITING.  As a writer of covered put options, the Fund incurs an
obligation to buy the security (or currency) underlying the option from the
purchaser of the put at the option's exercise price at any time during the
option period, at the purchaser's election (certain listed and OTC put options
written by the Fund will be excercisable by the purchaser only on a specific
date). The Fund will write put options for three purposes: (1) to receive the
premiums paid by purchasers; (2) when the Investment Manager wishes to purchase
the security underlying the option (or a security denominated in the currency
underlying the option) at a price lower than its current market price, in which
case it will write the covered put at an exercise price reflecting the lower
purchase price sought; and (3) to close out a long put option position. The
aggregate value of the obligations underlying the puts determined as of the date
the options are sold will not exceed 50% of the Fund's net assets.
 
PURCHASING CALL AND PUT OPTIONS.  The Fund may purchase listed and OTC call and
put options in amounts equalling up to 5% of its total assets. The Fund may
purchase call options to close out a written call position (see "Covered Call
Writing" above) or to protect against an increase in the price of a security it
anticipates purchasing or, in the case of call options on a foreign currency, to
hedge against an adverse exchange rate change of the currency in which the
security it anticipates purchasing is denominated vis-a-vis the currency in
which the exercise price is denominated. The Fund may purchase put options on
securities which it holds in its portfolio only to protect itself against a
decline in the value of the security. The Fund may also purchase put options to
close out written put positions in a manner similar to call option closing
purchase transactions. There are no other limits on the Fund's ability to
purchase call and put options.
 
FUTURES CONTRACTS.  The Fund may purchase and sell futures contracts that are
currently traded, or may in the future be traded, on U.S. and foreign commodity
exchanges on common stocks, such underlying fixed-income securities as U.S.
Treasury bonds, notes, and bills and/or any foreign government fixed-income
security ("interest rate" futures), on various currencies ("currency" futures)
and on such indexes of U.S. or foreign fixed-income securities as may exist or
come into being, such as the Moody's Investment Grade Corporate Bond Index
("index" futures). As a futures contract purchaser, the Fund incurs an
obligation to take delivery of a specified amount of the obligation underlying
the contract at a specified time in the future for a specified price. As a
seller of a futures contract, the Fund incurs an obligation to deliver the
specified amount of the underlying obligation at a specified time in return for
an agreed upon price.
 
    The Fund will purchase or sell interest rate futures contracts for the
purpose of hedging some or all of the value of its portfolio securities (or
anticipated portfolio securities) against changes in prevailing interest rates.
The Fund will purchase or sell index futures contracts for the purpose of
hedging some or all of its portfolio (or anticipated portfolio) securities
against changes in their prices.
 
OPTIONS ON FUTURES CONTRACTS.  The Fund may purchase and write call and put
options on futures contracts which are traded on an exchange and enter into
closing transactions with respect to such options to terminate an existing
position. An option on a futures contract gives the purchaser the right (in
return for the premium paid) to assume a position in a futures contract (a long
position if the option is a call and a short position if the option is a put) at
a specified exercise price at any time during the term of the option. The Fund
will purchase and write options on futures contracts for identical purposes to
those set forth above for the purchase of a futures contract (purchase of a call
option or sale of a put option) and the sale of a futures contract (purchase of
a put option or sale of a call option), or to close out a long or short position
in futures contracts.
 
RISKS OF OPTIONS AND FUTURES TRANSACTIONS.  The Fund may close out its position
as writer of an option, or as a buyer or seller of a futures contract, only if a
liquid secondary market exists for options or futures contracts of that series.
There is no assurance that such a market will exist, particularly in the case of
OTC options, as such options will generally only be closed out by entering into
a closing purchase transaction with the purchasing dealer.
 
    Exchanges may limit the amount by which the price of many futures contracts
may move on any day. If the price moves equal the daily limit on successive
days, then it may prove impossible to liquidate a futures position until the
daily limit moves have ceased.
 
    While the futures contracts and options transactions to be engaged in by the
Fund for the purpose of hedging the Fund's portfolio securities are not
speculative in nature, there are risks inherent in the use of such instruments.
One such risk is that the Fund's Investment Manager could be incorrect in its
expectations as to the direction or extent of various interest rate or price
movements or the time span within which the movements take place. For example,
if the Fund sold futures contracts for the sale of securities in
 
10
<PAGE>
anticipation of an increase in interest rates, and then interest rates went down
instead, causing bond prices to rise, the Fund would lose money on the sale.
 
    Another risk which may arise in employing futures contracts to protect
against the price volatility of portfolio securities is that the prices of
securities, currencies and indexes subject to futures contracts (and thereby the
futures contract prices) may correlate imperfectly with the behavior of the U.S.
dollar cash prices of the Fund's portfolio securities and their denominated
currencies. Another such risk is that prices of interest rate futures contracts
may not move in tandem with the changes in prevailing interest rates against
which the Fund seeks a hedge. A correlation may also be distorted by the fact
that the futures market is dominated by short-term traders seeking to profit
from the difference between a contract or security price objective and their
cost of borrowed funds. Such distortions are generally minor and would diminish
as the contract approached maturity.
 
    The Fund, by entering into transactions in foreign futures and options
markets, will also incur risks similar to those discussed above under the
section entitled "Foreign Securities."
 
REPURCHASE AGREEMENTS.  The Fund may enter into repurchase agreements, which may
be viewed as a type of secured lending by the Fund, and which typically involve
the acquisition by the Fund of debt securities from a selling financial
institution such as a bank, savings and loan association or broker-dealer. The
agreement provides that the Fund will sell back to the institution, and that the
institution will repurchase, the underlying security at a specified price and at
a fixed time in the future, usually not more than seven days from the date of
purchase. While repurchase agreements involve certain risks not associated with
direct investments in debt securities, including the risks of default or
bankruptcy of the selling financial institution, the Fund follows procedures to
minimize such risks. These procedures include effecting repurchase transactions
only with large, well-capitalized and well-established financial institutions
and maintaining adequate collateralization.
 
REVERSE REPURCHASE AGREEMENTS.  The Fund may also use reverse repurchase
agreements as part of its investment strategy. Reverse repurchase agreements
involve sales by the Fund of portfolio assets concurrently with an agreement by
the Fund to repurchase the same assets at a later date at a fixed price. Reverse
repurchase agreements involve the risk that the market value of the securities
the Fund is obligated to repurchase under the agreement may decline below the
repurchase price. In the event the buyer of securities under a reverse
repurchase agreement files for bankruptcy or becomes insolvent, the Fund's use
of proceeds of the agreement may be restricted pending a determination by the
other party, or its trustee or receiver, whether to enforce the Fund's
obligation to repurchase the securities.
 
ZERO COUPON SECURITIES.  A portion of the fixed-income securities purchased by
the Fund may be zero coupon securities. Such securities are purchased at a
discount from their face amount, giving the purchaser the right to receive their
full value at maturity. The interest earned on such securities is, implicitly,
automatically compounded and paid out at maturity. While such compounding at a
constant rate eliminates the risk of receiving lower yields upon reinvestment of
interest if prevailing interest rates decline, the owner of a zero coupon
security will be unable to participate in higher yields upon reinvestment of
interest received on interest-paying securities if prevailing interest rates
rise.
 
    A zero coupon security pays no interest to its holder during its life.
Therefore, to the extent the Fund invests in zero coupon securities, it will not
receive current cash available for distribution to shareholders. In addition,
zero coupon securities are subject to substantially greater price fluctuations
during periods of changing prevailing interest rates than are comparable
securities which pay interest on a current basis. Current federal tax law
requires that a holder (such as the Fund) of a zero coupon security accrue a
portion of the discount at which the security was purchased as income each year
even though the Fund receives no interest payments in cash on the security
during the year.
 
WHEN-ISSUED AND DELAYED DELIVERY SECURITIES AND FORWARD COMMITMENTS.  From time
to time, in the ordinary course of business, the Fund may purchase securities on
a when-issued or delayed delivery basis or may purchase or sell securities on a
forward commitment basis. When such transactions are negotiated, the price is
fixed at the time of the commitment, but delivery and payment can take place a
month or more after the date of the commitment. There is no overall limit on the
percentage of the Fund's assets which may be committed to the purchase of
securities on a when-issued, delayed delivery or forward commitment basis. An
increase in the percentage of the Fund's assets committed to the purchase of
securities on a when-issued, delayed delivery or forward commitment basis may
increase the volatility of the Fund's net asset value.
 
WHEN, AS AND IF ISSUED SECURITIES.  The Fund may purchase securities on a "when,
as and if issued" basis under which the issuance of the security depends upon
the occurrence of a subsequent event, such as approval of a merger, corporate
reorganization, leveraged buyout or debt restructuring. If the anticipated event
does not occur and the securities are not issued, the Fund will have lost an
investment opportunity. There is no overall limit on the percentage of the
Fund's assets which may be committed to the purchase of securities on a "when,
as and if issued" basis. An increase in the percentage of the Fund's assets
committed to the purchase of securities on a "when, as and if issued" basis may
increase the volatility of its net asset value.
 
                                                                              11
<PAGE>
LENDING OF PORTFOLIO SECURITIES.  Consistent with applicable regulatory
requirements, the Fund may lend its portfolio securities to brokers, dealers and
other financial institutions, provided that such loans are callable at any time
by the Fund (subject to certain notice provisions described in the Statement of
Additional Information), and are at all times secured by cash or cash
equivalents, which are maintained in a segregated account pursuant to applicable
regulations and that are at least equal to the market value, determined daily,
of the loaned securities.
 
PRIVATE PLACEMENTS.  The Fund may invest up to 10% of its total assets in
securities which are subject to restrictions on resale because they have not
been registered under the Securities Act of 1933, as amended (the "Securities
Act"), or which are otherwise not readily marketable. (Securities eligible for
resale pursuant to Rule 144A of the Securities Act, and determined to be liquid
pursuant to the procedures discussed in the following paragraph, are not subject
to the foregoing restriction.) These securities are generally referred to as
private placements or restricted securities. Limitations on the resale of such
securities may have an adverse effect on their marketability, and may prevent
the Fund from disposing of them promptly at reasonable prices. The Fund may have
to bear the expense of registering such securities for resale and the risk of
substantial delays in effecting such registration.
 
    The Securities and Exchange Commission has adopted Rule 144A under the
Securities Act, which permits the Fund to sell restricted securities to
qualified institutional buyers without limitation. The Investment Manager,
pursuant to procedures adopted by the Directors of the Fund, will make a
determination as to the liquidity of each restricted security purchased by the
Fund. If a restricted security is determined to be "liquid", such security will
not be included within the category "illiquid securities", which is limited by
the Fund's investment restrictions to 10% of the Fund's total assets. Investing
in Rule 144A securities could have the effect of increasing the level of Fund
illiquidity to the extent the Fund, at a particular time, may be unable to find
qualified institutional buyers interested in purchasing such securities.
 
YEAR 2000.  The investment management services provided to the Fund by the
Investment Manager and the services provided to shareholders by the Distributor
and the Transfer Agent depend on the smooth functioning of their computer
systems. Many computer software systems in use today cannot recognize the year
2000, but revert to 1900 or some other date, due to the manner in which dates
were encoded and calculated. That failure could have a negative impact on the
handling of securities trades, pricing and account services. The Investment
Manager, the Distributor and the Transfer Agent have been actively working on
necessary changes to their own computer systems to prepare for the year 2000 and
expect that their systems will be adapted before that date, but there can be no
assurance that they will be successful, or that interaction with other
non-complying computer systems will not impair their services at that time.
 
PORTFOLIO MANAGEMENT
 
The Fund's portfolio is actively managed by its Investment Manager with a view
to achieving the Fund's investment objective. The Fund is managed within
InterCapital's Taxable Fixed-Income Group, which manages twenty-five funds and
fund portfolios, with approximately $13.3 billion in assets at December 31,
1997. Rajesh K. Gupta, Senior Vice President of InterCapital and Anne Pickrell,
Vice President of InterCapital, each a member of InterCapital's Taxable
Fixed-Income Group are the Fund's primary portfolio managers. Mr. Gupta and Ms.
Pickrell have been the Fund's primary portfolio managers since February, 1998
and December, 1994, respectively. Mr. Gupta has been managing portfolios
consisting of fixed income securities since June, 1987. Ms. Pickrell has been a
portfolio manager at InterCapital since July, 1991. In determining which
securities to purchase for the Fund or hold in the Fund's portfolio, the
Investment Manager will rely on information from various sources, including
research, analysis and appraisals of brokers and dealers, including Dean Witter
Reynolds Inc. ("DWR"), Morgan Stanley & Co. Incorporated and other broker-dealer
affiliates of InterCapital, the views of others regarding economic developments
and interest rate trends, and the Investment Manager's own analysis of factors
it deems relevant.
 
    Personnel of the Investment Manager have substantial experience in the use
of the investment techniques described above under the heading "Options and
Futures Transactions," which techniques require skills different from those
needed to select the portfolio securities underlying various options and futures
contracts.
 
    Securities purchased by the Fund are generally sold by dealers acting as
principal for their own accounts. Orders for transactions in other portfolio
securities and commodities are placed for the Fund with a number of brokers and
dealers, including DWR, Morgan Stanley & Co. Incorporated and other
broker-dealers that are affiliates of InterCapital. Pursuant to an order of the
Securities and Exchange Commission, the Fund may effect principal transactions
in certain money market instruments with DWR. In addition, the Fund may incur
brokerage commissions on transactions conducted through DWR and Morgan Stanley &
Co. Incorporated.
 
    The Fund may sell portfolio securities without regard to the length of time
that they have been held, in order to take advantage of new investment
opportunities or yield differentials, or because the Fund desires to preserve
gains or limit losses due to changing economic conditions, interest rate trends,
or the financial condition of the issuer. It is not anticipated that the Fund's
portfolio turnover rate will
 
12
<PAGE>
exceed 200% in any one year. The Fund will incur underwriting discount costs (on
underwritten securities) and brokerage costs commensurate with its portfolio
turnover rate. Short term gains and losses may result from such portfolio
transactions. See "Dividends, Distributions and Taxes" for a discussion of the
tax implications of the Fund's transactions.
 
    The expenses of the Fund relating to its portfolio management are likely to
be greater than those incurred by other investment companies investing primarily
in securities issued by domestic issuers, as custodial costs, brokerage
commissions and other transaction charges related to investing in foreign
markets are generally higher than in the United States.
 
INVESTMENT RESTRICTIONS
- --------------------------------------------------------------------------------
 
The investment restrictions listed below are among the restrictions which have
been adopted by the Fund as fundamental policies. Under the Act, a fundamental
policy may not be changed without the vote of a majority of the outstanding
voting securities of the Fund, as defined in the Act. For purposes of the
following limitations: (i) all percentage limitations apply immediately after a
purchase or initial investment, and (ii) any subsequent change in any applicable
percentage resulting from market fluctuations or other changes in total or net
assets does not require elimination of any security from the portfolio.
 
    The Fund may not:
 
        1. Invest 25% or more of the value of its total assets in securities of
    issuers in any one industry, except that the Fund will concentrate in the
    banking industry.
 
        2. Invest more than 5% of the value of its total assets in securities of
    issuers having a record, together with predecessors, of less than three
    years of continuous operation. This restriction shall not apply to any
    obligation issued or guaranteed by the United States Government, its
    agencies or instrumentalities.
 
        3. Invest more than 10% of its total assets in "illiquid securities"
    (securities for which no active and substantial secondary market exists) and
    repurchase agreements which have a maturity of longer than seven days.
 
    Generally, OTC options and the assets used as "cover" for written OTC
options are "illiquid securities" (securities for which no active and
substantial secondary market exists). However, the Fund is permitted to treat
the securities it uses as cover for written OTC options as liquid provided it
follows a procedure whereby it will sell OTC options only to qualified dealers
who agree that the Fund may repurchase such options at a maximum price to be
calculated pursuant to a predetermined formula set forth in the option
agreement. The formula may vary from agreement to agreement, but is generally
based on a multiple of the premium received by the Fund for writing the option
plus the amount, if any, of the option's intrinsic value. An OTC option is
considered an illiquid asset only to the extent that the maximum repurchase
price under the formula exceeds the intrinsic value of the option.
 
PURCHASE OF FUND SHARES
- --------------------------------------------------------------------------------
 
The Fund offers its shares for sale to the public on a continuous basis.
Pursuant to a Distribution Agreement between the Fund and Dean Witter
Distributors Inc. (the "Distributor"), an affiliate of the Investment Manager,
shares of the Fund are distributed by the Distributor and offered by DWR and
other dealers which have entered into selected dealer agreements with the
Distributor ("Selected Broker-Dealers"). The principal executive office of the
Distributor is located at Two World Trade Center, New York, New York 10048.
 
    The minimum initial purchase is $1,000. Subsequent purchases of $100 or more
may be made by sending a check, payable to Dean Witter Global Short-Term Income
Fund Inc., directly to Dean Witter Trust FSB (the "Transfer Agent" or "DWT") at
P.O. Box 1040, Jersey City, NJ 07303 or by contacting an account executive of
DWR or other Selected Broker-Dealer. The minimum initial purchase, in the case
of investments through EasyInvest, an automatic purchase plan (see "Shareholder
Services"), is $100, provided that the schedule of automatic investments will
result in investments totalling at least $1,000 within the first twelve months.
The minimum initial purchase in the case of an "Education IRA" is $500, if the
Distributor has reason to believe that additional investments will increase the
investment in the account to $1,000 within three years. In the case of
investments pursuant to (i) Systematic Payroll Deduction Plans (including
Individual Retirement Plans), (ii) the InterCapital mutual fund asset allocation
program and (iii) fee-based programs approved by the Distributor, pursuant to
which participants pay an asset based fee for services in the nature of
investment advisory or administrative services, the Fund, in its discretion, may
accept investments without regard to any minimum amounts which would otherwise
be required, provided in the case of Systematic Payroll Deduction Plans, that
the Distributor has reason to believe that additional investments will increase
the investment in all accounts under such Plans to at least $1,000.
 
                                                                              13
<PAGE>
    Shares of the Fund are sold through the Distributor 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 purchased through the Distributor are entitled to dividends
beginning on the next business day following settlement date. Since DWR and
other Selected Broker-Dealers forward investors' funds on settlement date, they
will benefit from the temporary use of the funds if payment is made prior
thereto. Shares purchased through the Transfer Agent are entitled to dividends
beginning on the next business day following receipt of an order. As noted
above, orders placed directly with the Transfer Agent must be accompanied by
payment. Investors will be entitled to receive capital gains distributions if
their order is received by the close of business on the day prior to the record
date for such distributions. The offering price will be the net asset value per
share next determined following receipt of an order (see "Determination of Net
Asset Value" below).
 
    While no sales charge is imposed at the time shares are purchased, a
contingent deferred sales charge may be imposed at the time of redemption (see
"Redemptions and Repurchases"). Sales personnel are compensated for selling
shares of the Fund at the time of their sale by the Distributor or any of its
affiliates and/or the Selected Broker-Dealer. In addition, some sales personnel
of the Selected Broker-Dealer will receive various types of non-cash
compensation as special sales incentives, including trips, educational and/or
business seminars and merchandise. The Fund and the Distributor reserve the
right to reject any purchase orders.
 
PLAN OF DISTRIBUTION
 
The Fund has adopted a Plan of Distribution pursuant to Rule 12b-1 under the Act
(the "Plan"), under which the Fund pays the Distributor a fee, which is accrued
daily and payable monthly, at an annual rate of 0.75% of the lesser of: (a) the
average daily aggregate gross sales of the Fund's shares since the inception of
the Fund (not including reinvestments of dividends or capital gains
distributions), less the average daily aggregate net asset value of the Fund's
shares redeemed since the Fund's inception upon which a contingent deferred
sales charge has been imposed or waived; or (b) the Fund's average daily net
assets. This fee is treated by the Fund as an expense in the year it is accrued.
A portion of the fee payable pursuant to the Plan, equal to 0.25% of the Fund's
average daily net assets, is characterized as a service fee within the meaning
of NASD guidelines. The service fee is a payment made for personal service
and/or the maintenance of shareholder accounts.
 
    Amounts paid under the Plan are paid to the Distributor to compensate it for
the services provided and the expenses borne by the Distributor and others in
the distribution of the Fund's shares, including the payment of commissions for
sales of the Fund's shares and incentive compensation to and expenses of DWR
account executives and others who engage in or support distribution of shares or
who service shareholder accounts, including overhead and telephone expenses;
printing and distribution of prospectuses and reports used in connection with
the offering of the Fund's shares to other than current shareholders; and
preparation, printing and distribution of sales literature and advertising
materials. In addition, the Distributor may utilize fees paid pursuant to the
Plan to compensate DWR and other Selected Broker-Dealers for their opportunity
costs in advancing such amounts, which compensation would be in the form of a
carrying charge on any unreimbursed distribution expenses.
 
    For the fiscal year ended October 31, 1997, the Fund accrued payments under
the Plan amounting to $530,008, which amount is equal to 0.75% of the Fund's
average daily net assets for the fiscal year. The payments accrued under the
Plan were calculated pursuant to clause (b) of the compensation formula under
the Plan.
 
    At any given time, the Distributor may incur expenses in distributing shares
of the Fund which may be in excess of the total of (i) the payments made by the
Fund pursuant to the Plan, and (ii) the proceeds of contingent deferred sales
charges paid by investors upon the redemption of shares (see "Redemptions and
Repurchases--Contingent Deferred Sales Charge"). For example, if the Distributor
incurred $1 million in expenses in distributing shares of the Fund and $750,000
had been received by the Distributor as described in (i) and (ii) above, the
excess expense would amount to $250,000. The Distributor has advised the Fund
that such excess amounts, including the carrying charge described above,
totalled $7,269,740 at October 31, 1997, which equalled 11.84% of the Fund's net
assets at such date.
 
    Because there is no requirement under the Plan that the Distributor be
reimbursed for all distribution expenses or any requirement that the Plan be
continued from year to year, such excess amount does not constitute a liability
of the Fund. Although there is no legal obligation for the Fund to pay expenses
incurred by the Distributor in excess of payments made to the Distributor under
the Plan and the proceeds of contingent deferred sales charges paid by investors
upon redemption of shares, if for any reason the Plan is terminated, the
Directors will consider at that time the manner in which to treat such expenses.
Any cumulative expenses incurred but not yet recovered through distribution fees
or contingent deferred sales charges, may or may not be recovered through future
distribution fees or contingent deferred sales charges.
 
DETERMINATION OF NET ASSET VALUE
 
The net asset value per share of the Fund is determined once daily at 4:00 p.m.,
New York time (or, on days when
 
14
<PAGE>
the New York Stock Exchange closes prior to 4:00 p.m., at such earlier time), on
each day that the New York Stock Exchange is open by taking the value of all
assets of the Fund, subtracting all its liabilities, dividing by the number of
shares outstanding and adjusting to the nearest cent. The net asset value per
share will not be determined on Good Friday and on such other federal and
non-federal holidays as are observed by the New York Stock Exchange.
 
    In the calculation of the Fund's net asset value: (1) an equity portfolio
security listed or traded on the New York or American Stock Exchange or other
domestic or foreign stock exchange is valued at its latest sale price on that
exchange prior to the time when assets are valued; if there were no sales that
day, the security is valued at the latest bid price (in cases where securities
are traded on more than one exchange, the securities are valued on the exchange
designated as the primary market pursuant to procedures adopted by the
Directors); and (2) all other portfolio securities for which over-the-counter
market quotations are readily available are valued at the latest available bid
price prior to the time of valuation. When market quotations are not readily
available, including circumstances under which it is determined by the
Investment Manager that sale and bid prices are not reflective of a security's
market value, portfolio securities are valued at their fair value as determined
in good faith under procedures established by and under the general supervision
of the Fund's Directors. For valuation purposes, quotations of foreign portfolio
securities, other assets and liabilities and forward contracts stated in foreign
currency are translated into U.S. dollar equivalents at the prevailing market
rates prior to the close of the New York Stock Exchange. Dividends receivable
are accrued as of the ex-dividend date or as of the time that the relevant ex-
dividend date and amounts become known.
 
    Short-term debt securities with remaining maturities of 60 days or less at
the time of purchase are valued at amortized cost, unless the Directors
determine such does not reflect the securities' market value, in which case
these securities will be valued at their fair value as determined by the
Directors.
 
    Certain securities in the Fund's portfolio may be valued by an outside
pricing service approved by the Fund's Directors. The pricing service may
utilize a matrix system incorporating security quality, maturity and coupon as
the evaluation model parameters, and/or research evaluations by its staff,
including review of broker-dealer market price quotations, in determining what
it believes is the fair valuation of the portfolio securities.
 
    Generally, trading in foreign securities, as well as corporate bonds, United
States government securities and money market instruments, is substantially
completed each day at various times prior to 4:00 p.m., New York time. The
values of such securities used in computing the net asset value of the Fund's
shares are determined as of such times. Foreign currency exchange rates are also
generally determined prior to 4:00 p.m., New York time. Occasionally, events
which affect the values of such securities and such exchange rates may occur
between the times at which they are determined and 4:00 p.m., New York time and
will therefore not be reflected in the computation of the Fund's net asset
value. If events materially affecting the value of such securities occur during
such period, then these securities will be valued at their fair value as
determined in good faith under procedures established by and under the
supervision of the Directors.
 
SHAREHOLDER SERVICES
- --------------------------------------------------------------------------------
 
AUTOMATIC INVESTMENT OF DIVIDENDS AND DISTRIBUTIONS.  All income dividends and
capital gains distributions are automatically paid in full and fractional shares
of the Fund (or, if specified by the shareholder, any other open-end investment
company for which InterCapital serves as investment manager (collectively, with
the Fund, the "Dean Witter Funds")), unless the shareholder requests that they
be paid in cash. Shares so acquired are not subject to the imposition of a
contingent deferred sales charge upon their redemption (see "Redemptions and
Repurchases"). Such dividends and distributions will be paid, at the net asset
value per share, in shares of the Fund (or in cash if the shareholder so
requests) on the monthly payment date, which will be no later than the last
business day of the month for which the dividend or distribution is payable.
Processing of dividend checks begins immediately following the monthly payment
date. Shareholders who have requested to receive dividends in cash will normally
receive their monthly dividend check during the first ten days of the following
month.
 
EASYINVEST-SM-.  Shareholders may subscribe to EasyInvest, an automatic purchase
plan which provides for any amount from $100 to $5,000 to be transferred
automatically from a checking or savings account, or from a Dean Witter money
market fund, on a semi-monthly, monthly or quarterly basis, to the Transfer
Agent for investment in shares of the Fund (see "Purchase of Fund Shares" and
"Redemptions and Repurchases--Involuntary Redemption").
 
INVESTMENT OF DIVIDENDS OR DISTRIBUTIONS RECEIVED IN CASH.  Any shareholder who
receives a cash payment representing a dividend or capital gains distribution
may invest such dividend or distribution at the net asset value per share next
determined after receipt by the Transfer Agent, by returning the check or the
proceeds to the Transfer Agent within thirty days after the payment date. Shares
so acquired are not subject to the imposition of a contingent deferred sales
charge upon their redemption (see "Redemptions and Repurchases").
 
                                                                              15
<PAGE>
SYSTEMATIC WITHDRAWAL PLAN.  A systematic withdrawal plan (the "Withdrawal
Plan") is available for shareholders who own or purchase shares of the Fund
having a minimum value of $10,000 based upon the then current net asset value.
The Withdrawal Plan provides for monthly or quarterly (March, June, September,
and December) checks in any dollar amount, not less than $25, or in any whole
percentage of the account balance, on an annualized basis. Any applicable
contingent deferred sales charge will be imposed on shares redeemed under the
Withdrawal Plan (See "Redemptions and Repurchases--Contingent Deferred Sales
Charge"). Therefore, any shareholder participating in the Withdrawal Plan will
have sufficient shares redeemed from his or her account so that the proceeds
(net of any applicable contingent deferred sales charge) to the shareholder will
be the designated monthly or quarterly amount.
 
    Shareholders should contact their DWR or other Selected Broker-Dealer
account executive or the Transfer Agent for further information about any of the
above services.
 
TAX-SHELTERED RETIREMENT PLANS.  Retirement plans are available for use by
corporations, the self-employed, Individual Retirement Accounts and Custodial
Accounts under Section 403(b)(7) of the Internal Revenue Code. Adoption of such
plans should be on advice of legal counsel or tax adviser.
 
    For further information regarding plan administration, custodial fees and
other details, investors should contact their account executive or the Transfer
Agent.
 
EXCHANGE PRIVILEGE
 
The Fund makes available to its shareholders an "Exchange Privilege" allowing
the exchange of shares of the Fund for Class B shares of Dean Witter Funds that
are multiple class funds ("Dean Witter Multi-Class Funds"). Shares may also be
exchanged for shares of Dean Witter Short-Term U.S. Treasury Trust, Dean Witter
Limited Term Municipal Trust, Dean Witter Short-Term Bond Fund, Dean Witter
Intermediate Term U.S. Treasury Trust and five Dean Witter Funds which are money
market funds (the "Exchange Funds"). Exchanges may be made after the shares of
the Fund acquired by purchase (not by exchange or dividend reinvestment) have
been held for thirty days. There is no waiting period for exchanges of shares
acquired by exchange or dividend reinvestment.
 
    An exchange to a Dean Witter Multi-Class Fund or any Exchange Fund that is
not a money market fund is on the basis of the next calculated net asset value
per share of each fund after the exchange order is received. When exchanging
into a money market fund from the Fund, shares of the Fund are redeemed out of
the Fund at their next calculated net asset value and the proceeds of the
redemption are used to purchase shares of the money market fund at their net
asset value determined the following business day. Subsequent exchanges between
any of the money market funds and the Fund, any of the Dean Witter Multi-Class
Funds or any Exchange Fund that is not a money market fund can be effected on
the same basis.
 
    No contingent deferred sales charge ("CDSC") is imposed at the time of any
exchange, although any applicable CDSC will be imposed upon ultimate redemption.
Shares of the Fund which are exchanged for shares of a Dean Witter Multi-Class
Fund having a higher CDSC schedule than the Fund will be subject to the CDSC
schedule of the Dean Witter Multi-Class Fund, even if shares are subsequently
re-exchanged for shares of the Fund prior to redemption. Concomitantly, shares
of the Fund acquired in exchange for shares of a Dean Witter Multi-Class Fund
having a lower CDSC schedule than that of this Fund will be subject to the CDSC
schedule of this Fund, even if such shares are subsequently re-exchanged for
shares of the CDSC fund originally purchased. During the period of time the
shareholder remains in an Exchange Fund (calculated from the last day of the
month in which the Exchange Fund shares were acquired), the holding period (for
the purpose of determining the rate of the CDSC) is frozen. If those shares are
subsequently re-exchanged for shares of a Dean Witter Multi-Class Fund, the
holding period previously frozen when the first exchange was made resumes on the
last day of the month in which shares of a Dean Witter Multi-Class Fund are
reacquired. Thus, the CDSC is based upon the time (calculated as described
above) the shareholder was invested in shares of the Fund or in shares of a Dean
Witter Multi-Class Fund (see "Redemptions and Repurchases--Contingent Deferred
Sales Charge"). However, in the case of shares of the Fund exchanged into an
Exchange Fund on or after April 23, 1990, upon a redemption of shares which
results in a CDSC being imposed, a credit (not to exceed the amount of the CDSC)
will be given in an amount equal to the Exchange Fund 12b-1 distribution fees
incurred on or after that date which are attributable to those shares. (Exchange
Fund 12b-1 distribution fees are described in the prospectuses for those funds.)
 
ADDITIONAL INFORMATION REGARDING EXCHANGES.  Purchases and exchanges should be
made for investment purposes only. A pattern of frequent exchanges may be deemed
by the Investment Manager to be abusive and contrary to the best interests of
the Fund's other shareholders and, at the Investment Manager's discretion, may
be limited by the Fund's refusal to accept additional purchases and/or exchanges
from the investor. Although the Fund does not have any specific definition of
what constitutes a pattern of frequent exchanges, and will consider all relevant
factors in determining whether a particular situation is abusive and contrary to
the best interests of the Fund and its other shareholders, investors should be
aware that the Fund and each of the other Dean Witter Funds may in their
discretion limit or otherwise restrict the number of times this Exchange
Privilege may be exercised by any investor. Any such restriction will be made by
the Fund on a prospective basis only, upon notice to the shareholder not later
than ten days following such shareholder's most recent exchange.
 
16
<PAGE>
Also, the Exchange Privilege may be terminated or revised at any time by the
Fund and/or any of such Dean Witter Funds for which shares of the Fund have been
exchanged, upon such notice as may be required by applicable regulatory
agencies. Shareholders maintaining margin accounts with DWR or another Selected
Broker-Dealer are referred to their account executive regarding restrictions on
exchange of shares of the Fund pledged in the margin account.
 
    The current prospectus for each fund describes its investment objective(s)
and policies, and shareholders should obtain a copy and examine it carefully
before investing. Exchanges are subject to the minimum investment requirement
and any other conditions imposed by each fund. In the case of any shareholder
holding a share certificate or certificates, no exchanges may be made until all
applicable share certificates have been received by the Transfer Agent and
deposited in the shareholder's account. An exchange will be treated for federal
income tax purposes the same as a repurchase or redemption of shares, on which
the shareholder may realize a capital gain or loss. However, the ability to
deduct capital losses on an exchange may be limited in situations where there is
an exchange of shares within ninety days after the shares are purchased. The
Exchange Privilege is only available in states where an exchange may legally be
made.
 
    If DWR or another Selected Broker-Dealer is the current dealer of record and
its account numbers are part of the account information, shareholders may
initiate an exchange of shares of the Fund for shares of any of the Dean Witter
Funds (for which the Exchange Privilege is available) pursuant to this Exchange
Privilege by contacting their account executive (no Exchange Privilege
Authorization Form is required). Other shareholders (and those shareholders who
are clients of DWR or another Selected Broker-Dealer but who wish to make
exchanges directly by writing or telephoning the Transfer Agent) must complete
and forward to the Transfer Agent an Exchange Privilege Authorization Form,
copies of which may be obtained from the Transfer Agent, to initiate an
exchange. If the Authorization Form is used, exchanges may be made in writing or
by contacting the Transfer Agent at (800) 869-NEWS (toll-free).
 
    The Fund will employ reasonable procedures to confirm that exchange
instructions communicated over the telephone are genuine. Such procedures may
include requiring various forms of personal identification such as name, mailing
address, social security or other tax identification number and DWR or other
Selected Broker-Dealer account number (if any). Telephone instructions may also
be recorded. If such procedures are not employed, the Fund may be liable for any
losses due to unauthorized or fraudulent instructions.
 
    Telephone exchange instructions will be accepted if received by the Transfer
Agent between 9:00 a.m. and 4:00 p.m. New York time, on any day the New York
Stock Exchange is open. Any shareholder wishing to make an exchange who has
previously filed an Exchange Privilege Authorization Form and who is unable to
reach the Fund by telephone should contact his or her DWR or other Selected
Broker-Dealer account executive, if appropriate, or make a written exchange
request. Shareholders are advised that during periods of drastic economic or
market changes, it is possible that the telephone exchange procedures may be
difficult to implement, although this has not been the case with the Dean Witter
Funds in the past.
 
    Shareholders should contact their DWR or other Selected Broker-Dealer
account executive or the Transfer Agent for further information about the
Exchange Privilege.
 
REDEMPTIONS AND REPURCHASES
- --------------------------------------------------------------------------------
 
REDEMPTION.  Shares of the Fund can be redeemed for cash at any time at the net
asset value per share next determined; however, such redemption proceeds may be
reduced by the amount of any applicable contingent deferred sales charges (see
below). If shares are held in a shareholder's account without a share
certificate, a written request for redemption sent to the Fund's Transfer Agent
at P.O. Box 983, Jersey City, NJ 07303 is required. If certificates are held by
the shareholder, the shares may be redeemed by surrendering the certificates
with a written request for redemption along with any additional information
required by the Transfer Agent.
 
CONTINGENT DEFERRED SALES CHARGE.  Shares of the Fund which are held three years
or more after purchase (calculated from the last day of the month in which the
shares were purchased) will not be subject to any charge upon redemption. Shares
redeemed sooner than three years after purchase may, however, be subject to a
charge upon redemption. This charge is called a "contingent deferred sales
charge" ("CDSC"), which will be a percentage of the dollar amount of shares
redeemed and will be assessed on an amount equal to the lesser of the current
market value or the cost of the shares being redeemed. The size of this
percentage will depend upon how long the shares have been held, as set forth in
the table below:
 
<TABLE>
<CAPTION>
                                           CONTINGENT DEFERRED
                                              SALES CHARGE
          YEAR SINCE PURCHASE              AS A PERCENTAGE OF
              PAYMENT MADE                   AMOUNT REDEEMED
- ----------------------------------------  ---------------------
<S>                                       <C>
First...................................             3.0%
Second..................................             2.0%
Third...................................             1.0%
Fourth and thereafter...................          None
</TABLE>
 
                                                                              17
<PAGE>
    A CDSC will not be imposed on: (i) any amount which represents an increase
in value of shares purchased within the three years preceding the redemption;
(ii) the current net asset value of shares purchased more than three years prior
to the redemption; and (iii) the current net asset value of shares purchased
through reinvestment of dividends or distributions and/or shares acquired in
exchange for shares of Dean Witter Funds sold with a front-end sales charge or
of other Dean Witter Funds acquired in exchange for such shares. Moreover, in
determining whether a CDSC is applicable it will be assumed that amounts
described in (i), (ii) and (iii) above (in that order) are redeemed first.
 
    In addition, the CDSC, if otherwise applicable, will be waived in the case
of:
 
    (1) redemptions of shares held at the time a shareholder dies or becomes
disabled, only if the shares are: (A) registered either in the name of an
individual shareholder (not a trust), or in the names of such shareholder and
his or her spouse as joint tenants with right of survivorship; or (B) held in a
qualified corporate or self-employed retirement plan, Individual Retirement
Account ("IRA") or Custodial Account under Section 403(b)(7) of the Internal
Revenue Code ("403(b) Custodial Account"), provided in either case that the
redemption is requested within one year of the death or initial determination of
disability;
 
    (2) redemptions in connection with the following retirement plan
distributions: (A) lump-sum or other distributions from a qualified corporate or
self-employed retirement plan following retirement (or, in the case of a "key
employee" of a "top heavy" plan, following attainment of age 59 1/2); (B)
distributions from an IRA or 403(b) Custodial Account following attainment of
age 59 1/2; or (C) a tax-free return of an excess contribution to an IRA; and
 
    (3) all redemptions of shares held for the benefit of a participant in a
Qualified Retirement Plan which offers investment companies managed by the
Investment Manager or its subsidiary, Dean Witter Services Company Inc., as
self-directed investment alternatives and for which Dean Witter Trust FSB, which
is an affiliate of the Investment Manager, serves as Trustee or DWR's Retirement
Plan Services serves as recordkeeper pursuant to a written Recordkeeping
Services Agreement ("Eligible Plan"), provided that either: (A) the plan
continues to be an Eligible Plan after the redemption; or (B) the redemption is
in connection with the complete termination of the plan involving the
distribution of all plan assets to participants.
 
    With reference to  (1) above, for the purpose of determining disability, the
Distributor utilizes the definition of disability contained in Section 72(m)(7)
of the Internal Revenue Code, which relates to the inability to engage in
gainful employment. With reference to  (2) above, the term "distribution" does
not encompass a direct transfer of IRA, 403(b) Custodial Account or retirement
plan assets to a successor custodian or trustee. All waivers will be granted
only following receipt by the Distributor of confirmation of the shareholder's
entitlement.
 
REPURCHASE.  DWR and other Selected Broker-Dealers are authorized to repurchase
shares, as agent for the Fund, represented by a share certificate which is
delivered to any of their offices. Shares held in a shareholder's account
without a share certificate may also be repurchased by DWR and other Selected
Broker-Dealers upon the telephonic request of the shareholder. The repurchase
price is the net asset value next computed (see "Purchase of Fund Shares") after
such repurchase order is received by DWR or other Selected Broker-Dealers,
reduced by any applicable CDSC.
 
    The CDSC, if any, will be the only fee imposed upon repurchase by the Fund,
the Distributor or DWR or other Selected Broker-Dealers. The offers by DWR and
other Selected Broker-Dealers to repurchase shares may be suspended without
notice by them at any time. In that event, shareholders may redeem their shares
through the Fund's Transfer Agent as set forth above under "Redemption."
 
PAYMENT FOR SHARES REDEEMED OR REPURCHASED.  Payment for shares presented for
repurchase or redemption will be made by check within seven days after receipt
by the Transfer Agent of the certificate and/or written request in good order.
Such payment may be postponed or the right of redemption suspended under unusual
circumstances, e.g., when normal trading is not taking place on the New York
Stock Exchange. If the shares to be redeemed have recently been purchased by
check (including a government, certified or bank cashier's check), payment of
the redemption proceeds may be delayed for the minimum time needed to verify
that the check used for investment has been honored (not more than fifteen days
from the time of receipt of the check by the Transfer Agent). Shareholders
maintaining margin accounts with DWR or another Selected Broker-Dealer are
referred to their account executive regarding restrictions on redemption of
shares of the Fund pledged in the margin account.
 
REINSTATEMENT PRIVILEGE.  A shareholder who has had his or her shares redeemed
or repurchased and has not previously exercised this reinstatement privilege
may, within thirty days after the date of the redemption or repurchase,
reinstate any portion or all of the proceeds of such redemption or repurchase in
shares of the Fund at net asset value next determined after a reinstatement
request, together with the proceeds, is received by the Transfer Agent and
receive a pro-rata credit for any CDSC paid in connection with such redemption
or repurchase.
 
INVOLUNTARY REDEMPTION.  The Fund reserves the right to redeem, on sixty days'
notice and at net asset value, the shares of any shareholder (other than shares
held in an Individual Retirement Account or Custodial Account under Section
403(b)(7) of the Code) whose shares due to redemptions by the shareholder have a
value of less than
 
18
<PAGE>
$100 or such lesser amount as may be fixed by the Directors or, in the case of
an account opened through EasyInvest, if after twelve months the shareholder has
invested less than $1,000 in the account. However, before the Fund redeems such
shares and sends the proceeds to the shareholder, it will notify the shareholder
that the value of the shares is less than the applicable amount and allow the
shareholder sixty days to make an additional investment in an amount which will
increase the value of his or her account to at least the applicable amount
before the redemption is processed. No CDSC will be imposed on any involuntary
redemption.
 
DIVIDENDS, DISTRIBUTIONS AND TAXES
- --------------------------------------------------------------------------------
 
DIVIDENDS AND DISTRIBUTIONS.  The Fund intends to declare dividends from net
investment income on each day the New York Stock Exchange is open for business
(see "Purchase of Fund Shares"). The amount of the dividend declared may
fluctuate from day to day. Dividends are declared daily and paid monthly in
additional shares of the Fund. The Fund will distribute, at least annually, net
realized short-term and long-term capital gains, if any.
 
    All dividends and any capital gains distributions will be paid in additional
Fund shares and automatically credited to the shareholder's account without
issuance of a share certificate unless the shareholder requests in writing that
all dividends and/or distributions be paid in cash. (See "Shareholder
Services--Automatic Investment of Dividends and Distributions".)
 
TAXES.  Because the Fund intends to distribute all of its net investment income
and net short-term capital gains to shareholders and otherwise qualify as a
regulated investment company under Subchapter M of the Code, it is not expected
that the Fund will be required to pay any federal income tax on such income and
capital gains.
 
    Gains or losses on the Fund's transactions in certain listed options on
securities and on futures and options on futures traded on U.S. exchanges
generally are treated as 60% long-term gain or loss and 40% short-term gain or
loss. When the Fund engages in options and futures transactions, various tax
regulations applicable to the Fund may have the effect of causing the Fund to
recognize a gain or loss for tax purposes before that gain or loss is realized,
or to defer recognition of a realized loss for tax purposes. Recognition, for
tax purposes, of an unrealized loss may result in a lesser amount of the Fund's
realized net gains being available for distribution.
 
    Shareholders will normally have to pay federal income taxes, and any
applicable state and/or local income taxes, on the dividends and distributions
they receive from the Fund. Such dividends and distributions, to the extent that
they are derived from net investment income and net short-term capital gains,
are taxable to the shareholder as ordinary dividend income regardless of whether
the shareholder receives such distributions in additional shares or in cash. Any
dividends declared in the last quarter of any calendar year which are paid in
the following year prior to February 1, will be deemed, for tax purposes, to
have been received by the shareholder in the prior year.
 
    Distributions of net long-term capital gains, if any, are taxable to
shareholders as long-term capital gains regardless of how long a shareholder has
held the Fund's shares and regardless of whether the distribution is received in
additional shares or in cash. It is not anticipated that any portion of the
Fund's distributions will be eligible for the dividends received deduction to
corporate shareholders.
 
    The Fund may at times make payments from sources other than income or net
capital gains. Payments from such sources will, in effect, represent a return of
a portion of each shareholder's investment. All, or a portion, of such payments
will not be taxable to shareholders.
 
    After the end of the year, shareholders will 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.
 
    To avoid being subject to a 31% federal backup withholding tax on taxable
dividends, capital gains distributions and the proceeds of redemptions and
repurchases, shareholders' taxpayer identification numbers must be furnished and
certified as to their accuracy. Shareholders who are not citizens or residents
of, or entities organized in, the United States may be subject to withholding
taxes of up to 30% on certain payments received from the Fund.
 
    Dividends, interest and gains received by the Fund may give rise to
withholding and other taxes imposed by foreign countries. If it qualifies for
and has made the appropriate election with the Internal Revenue Service, the
Fund will report annually to its shareholders the amount per share of such
taxes, to enable shareholders to claim United States foreign tax credits or
deductions with respect to such taxes. In the absence of such an election, the
Fund would deduct foreign tax in computing the amount of its distributable
income.
 
    The foregoing discussion relates solely to the federal income tax
consequences of an investment in the Fund. Distributions may also be subject to
state and local taxes; therefore, each shareholder is advised to consult his or
her own tax adviser.
 
                                                                              19
<PAGE>
PERFORMANCE INFORMATION
- --------------------------------------------------------------------------------
 
From time to time the Fund may quote its "yield" and/or its "total return" in
advertisements and sales literature. Both the yield and the total return of the
Fund are based on historical earnings and are not intended to indicate future
performance. The yield of the Fund is computed by dividing the Fund'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 applicable regulatory
requirements. Such amount is compounded for six months and then annualized for a
twelve-month period to derive the Fund's yield.
 
    The "average annual total return" of the Fund refers to a figure reflecting
the average annualized percentage increase (or decrease) in the value of an
initial investment in the Fund of $1,000 over a period of one year and five
years, as well as the life of the Fund. Average annual total return reflects all
income earned by the Fund, any appreciation or depreciation of the Fund's
assets, all expenses incurred by the Fund and all sales charges which would be
incurred by redeeming shareholders, for the stated periods. It also assumes
reinvestment of all dividends and distributions paid by the Fund.
 
    In addition to the foregoing, the Fund may advertise its total return over
different periods of time by means of aggregate, average, and year-by-year or
other types of total return figures. Such calculations may or may not reflect
the deduction of the contingent deferred sales charge which, if reflected, would
reduce the performance quoted. The Fund may also advertise the growth
ofhypothetical investments of $10,000, $50,000 and $100,000 in shares of the
Fund. The Fund from time to time may also advertise its performance relative to
certain performance rankings and indexes compiled by independent organizations
(such as mutual fund performance rankings of Lipper Analytical Services, Inc.).
 
ADDITIONAL INFORMATION
- --------------------------------------------------------------------------------
 
VOTING RIGHTS.  All shares of the Fund are of common stock of $0.01 par value
and are equal as to earnings, assets and voting privileges. There are no
conversion, pre-emptive or other subscription rights. In the event of
liquidation, each share of common stock of the Fund is entitled to its portion
of all of the Fund's assets after all debts and expenses have been paid. The
shares do not have cumulative voting rights.
 
    The Fund is not required to hold Annual Meetings of Shareholders, and in
ordinary circumstances the Fund does not intend to hold such meetings. The
Directors may call Special Meetings of Shareholders for action by shareholder
vote as may be required by the Act or the Fund's By-Laws.
 
CODE OF ETHICS.  Directors, officers and employees of InterCapital, Dean Witter
Services Company Inc. and the Distributor 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
Dean Witter Fund is engaged at the same time in a purchase or sale of the same
security. The Code of Ethics bans the purchase of securities in an initial
public offering, and also prohibits engaging in futures and options transactions
and profiting on short-term trading (that is, a purchase within sixty days of a
sale or a sale within sixty days of a purchase) of a security. In addition,
investment personnel may not purchase or sell a security for their personal
account within thirty days before or after any transaction in any 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 Fund should be directed to
the Fund at the telephone numbers or address set forth on the front cover of
this Prospectus.
 
20
<PAGE>
DEAN WITTER
GLOBAL SHORT-TERM INCOME FUND INC.
TWO WORLD TRADE CENTER
NEW YORK, NEW YORK 10048
 
DIRECTORS
Michael Bozic
Charles A. Fiumefreddo
Edwin J. Garn
John R. Haire
Wayne E. Hedien
Dr. Manuel H. Johnson
Michael E. Nugent
Philip J. Purcell
John L. Schroeder
 
OFFICERS
Charles A. Fiumefreddo
Chairman and Chief Executive Officer
Barry Fink
Vice President, Secretary and
General Counsel
Rajesh K. Gupta
Vice President
Anne Pickrell
Vice President
Thomas F. Caloia
Treasurer
 
CUSTODIAN
The Chase Manhattan Bank
One Chase Plaza
New York, NY 10005
 
TRANSFER AGENT AND
DIVIDEND DISBURSING AGENT
Dean Witter Trust FSB
Harborside Financial Center
Plaza Two
Jersey City, New Jersey 07311
 
INDEPENDENT ACCOUNTANTS
Price Waterhouse LLP
1177 Avenue of the Americas
New York, New York 10036
 
INVESTMENT MANAGER
Dean Witter InterCapital Inc.


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