GABELLI MONEY MARKET FUNDS
N-30D, 2000-05-18
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                   THE GABELLI U.S. TREASURY MONEY MARKET FUND

                               SEMI-ANNUAL REPORT
                                MARCH 31, 2000(A)








                                                                 [Photo omitted]
                                                                JUDITH A. RANERI

TO OUR SHAREHOLDERS,

      At the March 21, 2000 Federal Open Market  Committee  ("FOMC") meeting the
Federal Reserve Board (the "Fed") raised short term interest rates for the fifth
time in less than a year, as part of its continuing  crusade to slow the economy
and keep  inflation  in check.  The FOMC  justified  their  action once again by
warning of  "inflationary  imbalances  that could imperil the current  record of
economic expansion". At that point, there were few signs of inflation apart from
rising  fuel  prices;  certainly  nothing in the data could argue for the Fed to
alter its anticipated course of action. Growth during the fourth quarter of 1999
was  extremely  strong and  indications  in the first  quarter  of 2000  suggest
similar strength.

      Since the  beginning of the year,  the bond market has  undergone  erratic
price swings caused largely by continued Fed  tightening,  the initiation of the
Treasury's   buyback  program,   volatility  in  equity  markets  and  continued
indications that the economy is expanding at an  unprecedented  rate. The market
has seen little to no evidence that the pace of the current  economic  expansion
is slowing, tight labor market conditions have eased or that price pressures are
moderating.  Recent  economic  releases such as the  employment  report  reflect
exceptionally  tight  labor  market  conditions.  Non-farm  payrolls  surged  by
416,000.  Average hourly  earnings  increased by 0.4% for the third  consecutive
month and are at their  highest  level in more  than six  months.  The  National
Association of Purchasing Management prices paid index surged to a new five-year
high of 79.8,  suggesting  that pipeline  inflation  pressures are  increasingly
threatening to finished goods prices.

      Additional  signs of  robust  economic  activity  are  evidenced  from the
consumer and  manufacturing  sectors.  Personal  income and spending  were up in
February  (income rose 0.4% and spending rose 1.0%) and point to continued solid
personal   consumption.   Consumer   confidence  also  remains  quite  high,  as
underscored  by  the  final  reading  on the  University  of  Michigan  Consumer
Sentiment Index. On the growth

- --------------------------------------------------------------------------------
(A) THE FUND'S FISCAL YEAR ENDS SEPTEMBER 30.

<PAGE>

and inflation  fronts,  the Producer  Price Index ("PPI")  jumped 1.0% as energy
costs  soared once again and retail sales came in stronger  than  expected - the
fastest  pace  in more  than 15  years -  emphasizing  the  economy's  excessive
momentum.  In addition,  March's  Consumer Price Index ("CPI") report rose 0.7%,
with the core rate up 0.4%, the largest  one-month rise in core consumer  prices
since January of 1995.  With the issuance of this current data,  Gross  Domestic
Product ("GDP") growth is expected to be at least 5.5%, far above any reasonable
current estimates considering the economy's excessive pace.

      The Fed has continued its tightening  cycle well into the first quarter of
2000.  Although  the recent  volatility  within the equity  markets is  probably
adequate  to help  moderate  Fed  action,  it is not  enough to allow the Fed to
remain sidelined completely. The Fed is scheduled to meet twice again during the
second  quarter,  on May 16 and then again on June 27. It appears  that with the
economy continuing to expand rapidly,  labor markets at their tightest levels in
years and pipeline inflation pressures still rising, the Fed will elect to raise
rates yet again.

INVESTMENT RESULTS

      For the  twelve-month  period  ended  March 31,  2000,  The  Gabelli  U.S.
Treasury  Money Market  Fund's (the "Fund")  total return was 4.73%.  The Lipper
U.S.  Treasury  Money  Market  Average had a total return of 4.51% over the same
period.  The Lipper  Average  reflects the average  performance  of mutual funds
classified in this particular  category.  The Fund's 7-day  annualized yield and
30-day annualized yield on March 31, 2000 were 5.41% and 5.37%, respectively.

      For the  five-year  period ended March 31,  2000,  the Fund's total return
averaged  5.04%  versus an average  annual  total return of 4.80% for the Lipper
U.S.  Treasury Money Market Average.  Since inception on October 1, 1992 through
March 31, 2000,  the Fund had an average  annual  total  return of 4.51%.  As of
March 31,  2000,  direct  shareholders  total  6,429 and net  assets  are $482.7
million.  The Fund  maintained  a stable  net  asset  value of $1.00  per  share
throughout the period.

MINIMUM INITIAL INVESTMENT - $10,000

      The Fund's minimum initial investment is $10,000. However, shareholders of
any of the Gabelli  Funds may invest in the Fund with an initial  investment  of
$3,000.  IRAs,  retirement accounts and custodial accounts for minors require an
initial  investment of only $1,000. The Fund provides check writing and exchange
privileges and continues to offer these  services at no charge to  shareholders.
The Fund's  expenses  are  voluntarily  capped at 0.30% of average  net  assets,
making it one of the most attractive U.S. Treasury-only money market funds. With
dividends  that are exempt from state and local income taxes in all states,  the
Fund is an excellent vehicle in which to store idle cash.


                                        2
<PAGE>

DAILY DIVIDENDS

      The Fund declares daily  dividends  which are reinvested  monthly unless a
cash  distribution is requested.  The Fund invests  exclusively in U.S. Treasury
securities  and therefore  100% of the Fund's  income  dividends are exempt from
state and local income taxes in all states.  Please consult your tax adviser for
the applicability to your specific situation.

      We thank you for your  loyalty and as always,  pledge our best  efforts on
your behalf as we seek to provide you with competitive  returns.  Please call us
at   1-800-GABELLI   (1-800-422-3554)   during  the  business  day  for  further
information.

                                                     Sincerely,

                                                     /S/ Judith A. Raneri

                                                     JUDITH A. RANERI
                                                     Vice President and
                                                     Portfolio Manager
April 14, 2000



PAST  PERFORMANCE IS NO GUARANTEE OF FUTURE  RESULTS.  Total returns and average
annual returns, which reflect changes in investment income, are net of expenses.
Investment returns and yields will fluctuate.  An investment in The Gabelli U.S.
Treasury  Money  Market  Fund is  neither  insured  nor  guaranteed  by the U.S.
Government or the Federal Deposit Insurance Corporation. Although the Fund seeks
to  preserve  the value of an  investment  at $1.00 per  share,  there can be no
assurance  that the Fund will maintain a stable $1.00 per share net asset value,
so it is possible to lose money by investing in the Fund. The Fund's  prospectus
contains more complete information,  including fees and expenses. The prospectus
should be read  carefully  before  investing  or  sending  money.  If the Fund's
expenses  had not been  capped,  the Fund's  7-day  annualized  yield and 30-day
annualized yield would have been 4.46% and 4.56%, respectively,  as of March 31,
2000.


                                        3
<PAGE>

THE GABELLI U.S. TREASURY MONEY MARKET FUND
STATEMENT OF NET ASSETS -- MARCH 31, 2000 (UNAUDITED)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                              ANNUALIZED
  PRINCIPAL                                  YIELD AT DATE               MATURITY                         MARKET
   AMOUNT                                     OF PURCHASE                  DATE                            VALUE
  ---------                                  -------------               --------                         ------
 <S>            <C>                         <C>                      <C>                        <C>    <C>

                U.S. TREASURY OBLIGATIONS -- 100.1%
                U.S. TREASURY BILLS -- 100.1%
 $486,460,000   U.S. Treasury Bills ......  5.295% to 5.884%         04/20/00-07/13/00                 $483,038,148
                                                                                                       ------------
 TOTAL INVESTMENTS (Cost $483,038,148)(a) ....................................................  100.1%  483,038,148
 OTHER ASSETS AND LIABILITIES (NET) ..........................................................   (0.1)     (391,215)
                                                                                                -----  ------------
 NET ASSETS (applicable to 482,646,933 shares outstanding,
   $0.001 par value, one billion shares authorized) ..........................................  100.0% $482,646,933
                                                                                                =====  ============
 NET ASSET VALUE, OFFERING AND REDEMPTION PRICE PER SHARE ....................................                $1.00
                                                                                                              =====
</TABLE>
- ----------------------------------------------------
(a) Aggregate cost for Federal tax purposes.


FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------

Selected data for a share of beneficial  interest  outstanding  throughout  each
period:

<TABLE>
<CAPTION>
                                                       SIX MONTHS ENDED                 YEAR ENDED SEPTEMBER 30,
                                                        MARCH 31, 2000   -----------------------------------------------------
                                                          (UNAUDITED)       1999       1998       1997(C)     1996      1995
                                                           ---------      ---------  ---------  ---------  ---------  ---------
<S>                                                        <C>            <C>        <C>        <C>        <C>        <C>
OPERATING PERFORMANCE:
   Net asset value, beginning of period ...............    $    1.00      $    1.00  $    1.00  $    1.00  $    1.00  $    1.00
                                                           ---------      ---------  ---------  ---------  ---------  ---------
   Net investment income (a) ..........................       0.0246         0.0422     0.0496     0.0485     0.0492     0.0528
   Net realized gain on investments ...................       0.0002         0.0005     0.0005     0.0013     0.0006     0.0002
                                                           ---------      ---------  ---------  ---------  ---------  ---------
   Total from investment operations ...................       0.0248         0.0427     0.0501     0.0498     0.0498     0.0530
                                                           ---------      ---------  ---------  ---------  ---------  ---------
DISTRIBUTIONS TO SHAREHOLDERS:
   Net investment income ..............................      (0.0246)       (0.0422)   (0.0496)   (0.0485)   (0.0492)   (0.0528)
   Net realized gain on investments ...................      (0.0002)       (0.0005)   (0.0005)   (0.0013)   (0.0006)   (0.0002)
                                                           ---------      ---------  ---------  ---------  ---------  ---------
   Total distributions ................................      (0.0248)       (0.0427)   (0.0501)   (0.0498)   (0.0498)   (0.0530)
                                                           ---------      ---------  ---------  ---------  ---------  ---------
   NET ASSET VALUE, END OF PERIOD .....................    $    1.00      $    1.00  $    1.00  $    1.00  $    1.00  $    1.00
                                                           =========      =========  =========  =========  =========  =========
   Total return+ ......................................         2.5%           4.4%       5.1%       5.1%       5.1%       5.4%
                                                           =========      =========  =========  =========  =========  =========
RATIOS TO AVERAGE NET ASSETS AND SUPPLEMENTAL DATA:
   Net assets, end of period (in 000's) ...............    $ 482,647      $ 480,100  $ 314,394  $ 203,542  $ 216,038  $ 218,036
                                                           ---------      ---------  ---------  ---------  ---------  ---------
   Ratio of net investment income to average net assets        4.93%(d)       4.19%      4.91%      4.85%      4.92%      5.30%
   Ratio of operating expenses to average net assets (b)       0.30%(d)       0.30%      0.30%      0.30%      0.30%      0.27%
</TABLE>
- ---------------------------------------
+   Total return  represents  aggregate  total return of a  hypothetical  $1,000
    investment  at the beginning of the period and sold at the end of the period
    including  reinvestment  of  dividends.  Total return for the period of less
    than one year is not annualized.
(a) Net  investment  income before fees waived by the Manager for the six months
    ended March 31, 2000 and the fiscal years ended  September  30, 1999,  1998,
    1997, 1996 and 1995 were $0.0242,  $0.0412,  $0.0475,  $0.0469,  $0.0477 and
    $0.0516, respectively.
(b) Operating  expense  ratios  before  fees  waived by the  Manager for the six
    months ended March 31, 2000 and the fiscal years ended  September  30, 1999,
    1998, 1997, 1996 and 1995 were 0.37%,  0.40%, 0.46%, 0.45%, 0.45% and 0.39%,
    respectively.
(c) Gabelli Funds,  LLC became the sole investment  adviser of the Fund on April
    15, 1997.
(d) Annualized.

                 See accompanying notes to financial statements.


                                        4
<PAGE>


THE GABELLI U.S. TREASURY MONEY MARKET FUND
STATEMENT OF OPERATIONS -- FOR THE SIX MONTHS ENDED MARCH 31, 2000 (UNAUDITED)
- --------------------------------------------------------------------------------

INVESTMENT INCOME:
   Interest ..............................................    $ 13,766,501
                                                              ------------
EXPENSES:
   Management fees .......................................         790,349
   Transfer agent fees ...................................          72,174
   Custodian fees ........................................          41,040
   Registration fees .....................................          26,967
   Legal and audit fees ..................................          15,955
   Trustees' fees ........................................          12,000
   Shareholder communications expenses ...................           9,580
   Miscellaneous expenses ................................          13,374
                                                              ------------
   TOTAL EXPENSES BEFORE FEES WAIVED BY MANAGER ..........         981,439
   Fees waived by Manager ................................        (189,994)
                                                              ------------
   TOTAL EXPENSES -- NET .................................         791,445
                                                              ------------
NET INVESTMENT INCOME ....................................      12,975,056
NET REALIZED GAIN ON INVESTMENTS .........................         121,685
                                                              ------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS .....    $ 13,096,741
                                                              ============


STATEMENT OF CHANGES IN NET ASSETS
- --------------------------------------------------------------------------------

                                           SIX MONTHS ENDED       YEAR ENDED
                                            MARCH 31, 2000      SEPTEMBER 30,
                                              (UNAUDITED)            1999
                                         --------------------------------------
OPERATIONS:
  Net investment income ...............   $    12,975,056      $    17,970,183
  Net realized gain on investments ....           121,685              230,183
                                          ---------------      ---------------
  NET INCREASE IN NET ASSETS
    RESULTING FROM OPERATIONS .........        13,096,741           18,200,366
                                          ---------------      ---------------
DISTRIBUTIONS TO SHAREHOLDERS:
  Net investment income ...............       (12,975,056)         (17,970,183)
  Net realized gain on investments ....          (121,685)            (230,183)
                                          ---------------      ---------------
  TOTAL DISTRIBUTIONS TO SHAREHOLDERS         (13,096,741)         (18,200,366)
                                          ---------------      ---------------
SHARE TRANSACTIONS ($1.00 PER SHARE):
  Shares sold .........................     1,113,838,931        2,175,277,133
  Shares issued upon reinvestment
    of dividends and distributions ....        12,810,521           17,576,389
  Shares redeemed .....................    (1,124,102,031)      (2,027,147,677)
                                          ---------------      ---------------
  NET INCREASE IN NET ASSETS ..........         2,547,421          165,705,845
NET ASSETS:
  Beginning of period .................       480,099,512          314,393,667
                                          ---------------      ---------------
  End of period .......................   $   482,646,933      $   480,099,512
                                          ===============      ===============


                 See accompanying notes to financial statements.


                                        5
<PAGE>


THE GABELLI U.S. TREASURY MONEY MARKET FUND
NOTES TO FINANCIAL STATEMENTS (UNAUDITED)


1.  DESCRIPTION.  The Gabelli U.S.  Treasury  Money Market Fund (the "Fund"),  a
series of The Gabelli Money Market Funds (the "Trust"), was organized on May 21,
1992  as  a  Delaware  business  trust.  The  Fund  is a  diversified,  open-end
management  investment  company  registered under the Investment  Company Act of
1940, as amended (the "1940 Act"). The Fund's primary  objective is high current
income  consistent with the  preservation  of principal and liquidity.  The Fund
commenced investment operations on October 1, 1992.

2. SIGNIFICANT  ACCOUNTING POLICIES.  The preparation of financial statements in
accordance with generally accepted accounting  principles requires management to
make estimates and assumptions  that affect the reported amounts and disclosures
in the financial  statements.  Actual results could differ from those estimates.
The following is a summary of significant  accounting  policies  followed by the
Fund in the preparation of its financial statements.

SECURITY VALUATION. Investments are valued at amortized cost (which approximates
market value) whereby a portfolio  instrument is valued at cost and any discount
or premium is amortized on a constant basis to the maturity of the instrument.

SECURITIES  TRANSACTIONS  AND INVESTMENT  INCOME.  Securities  transactions  are
accounted  for on the  trade  date  with  realized  gain or loss on  investments
determined  by using the  identified  cost method.  Interest  income  (including
amortization of premium and accretion of discount) is recorded as earned.

DIVIDENDS  AND  DISTRIBUTIONS.   Dividends  from  investment  income  (including
realized  capital  gains  and  losses)  are  declared  daily  and paid  monthly.
Distributions of long term capital gains, if any, are paid annually.

PROVISION  FOR  INCOME  TAXES.  The Fund  intends  to  continue  to qualify as a
regulated  investment company under Subchapter M of the Internal Revenue Code of
1986, as amended. As a result, a Federal income tax provision is not required.

3. AGREEMENTS WITH AFFILIATED  PARTIES.  The Trust has entered into a management
agreement (the "Management  Agreement") with Gabelli Funds, LLC (the "Manager"),
which  provides  that the Trust will pay the Manager a fee,  computed  daily and
paid  monthly,  at the  annual  rate of 0.30  percent of the value of the Fund's
average  daily net assets.  In accordance  with the  Management  Agreement,  the
Manager  provides a  continuous  investment  program  for the Fund's  portfolio,
oversees the  administration  of all aspects of the Fund's  business and affairs
and pays the  compensation  of all Officers and Trustees of the Fund who are its
affiliates.  To the extent  necessary,  the  Manager  has  undertaken  to assume
certain  expenses  of the Trust so that the total  expenses  do not exceed  0.30
percent of the Fund's  average daily net assets.  For the six months ended March
31, 2000, the Manager voluntarily waived management fees of $189,994.


                                        6
<PAGE>
- --------------------------------------------------------------------------------
                             GABELLI FAMILY OF FUNDS
- --------------------------------------------------------------------------------

GABELLI ASSET FUND--------------------------------------------------------------
Seeks to invest primarily in a diversified portfolio of common stocks selling at
significant  discounts  to  their  private  market  value.  The  Fund's  primary
objective is growth of capital.  (NO-LOAD)
                                        PORTFOLIO MANAGER: MARIO J. GABELLI, CFA

GABELLI GROWTH FUND-------------------------------------------------------------
Seeks to invest  primarily in large cap stocks believed to have  favorable,  yet
undervalued,  prospects for earnings  growth.  The Fund's  primary  objective is
capital appreciation. (NO-LOAD)
                                          PORTFOLIO MANAGER: HOWARD F. WARD, CFA

GABELLI WESTWOOD EQUITY FUND----------------------------------------------------
Seeks to invest primarily in the common stock of seasoned  companies believed to
have proven records and above average  historical  earnings  growth.  The Fund's
primary objective is capital appreciation. (NO-LOAD)
                                               PORTFOLIO MANAGER: SUSAN M. BYRNE

GABELLI SMALL CAP GROWTH FUND---------------------------------------------------
Seeks  to  invest  primarily  in  common  stock  of  smaller  companies  (market
capitalizations  less than $500  million)  believed  to have rapid  revenue  and
earnings growth potential. The Fund's primary objective is capital appreciation.
(NO-LOAD)
                                        PORTFOLIO MANAGER: MARIO J. GABELLI, CFA

GABELLI BLUE CHIP VALUE FUND----------------------------------------------------
Seeks  long-term  growth of capital through  investment  primarily in the common
stocks  of   well-established,   high   quality   companies   that  have  market
capitalizations of greater than $5 billion. (NO-LOAD)
                                         PORTFOLIO MANAGER:  BARBARA MARCIN, CFA

GABELLI WESTWOOD SMALLCAP EQUITY FUND-------------------------------------------
Seeks to invest primarily in smaller  capitalization  equity securities - market
caps of $1 billion or less.  The Fund's primary  objective is long-term  capital
appreciation. (NO-LOAD)
                                            PORTFOLIO MANAGER: LYNDA CALKIN, CFA

GABELLI WESTWOOD INTERMEDIATE BOND FUND-----------------------------------------
Seeks to invest in a diversified portfolio of bonds with various maturities. The
Fund's primary objective is total return. (NO-LOAD)
                                               PORTFOLIO MANAGER: PATRICIA FRAZE

GABELLI EQUITY INCOME FUND------------------------------------------------------
Seeks to invest primarily in equity securities with above market average yields.
The Fund pays quarterly dividends and seeks a high level of total return with an
emphasis on income. (NO-LOAD)
                                        PORTFOLIO MANAGER: MARIO J. GABELLI, CFA

GABELLI WESTWOOD BALANCED FUND--------------------------------------------------
Seeks to invest in a balanced and diversified portfolio of stocks and bonds. The
Fund's  primary  objective  is both  capital  appreciation  and current  income.
(NO-LOAD)
                             PORTFOLIO MANAGERS: SUSAN M. BYRNE & PATRICIA FRAZE

GABELLI WESTWOOD MIGHTY MITES[SERVICE MARK] FUND--------------------------------
Seeks to invest in micro-cap companies that have market  capitalizations of $300
million or less. The Fund's primary objective is long-term capital appreciation.
(NO-LOAD)
                                            TEAM MANAGED: MARIO J. GABELLI, CFA,
                                           MARC J. GABELLI, LAURA K. LINEHAN AND
                                                                 WALTER K. WALSH

GABELLI VALUE FUND--------------------------------------------------------------
Seeks to invest in  securities  of  companies  believed to be  undervalued.  The
Fund's primary objective is long-term capital  appreciation.  MAX. SALES CHARGE:
5 1/2%
                                        PORTFOLIO MANAGER: MARIO J. GABELLI, CFA

GABELLI UTILITIES FUND----------------------------------------------------------
Seeks to provide a high level of total return  through a combination  of capital
appreciation and current income.  (NO-LOAD)
                                         PORTFOLIO MANAGER: TIMOTHY O'BRIEN, CFA

GABELLI ABC FUND----------------------------------------------------------------
Seeks to invest in securities with attractive  opportunities for appreciation or
investment  income.  The Fund's  primary  objective  is total  return in various
market conditions without excessive risk of capital loss. (NO-LOAD)
                                        PORTFOLIO MANAGER: MARIO J. GABELLI, CFA

GABELLI MATHERS FUND------------------------------------------------------------
Seeks  long-term  capital  appreciation  in various  market  conditions  without
excessive risk of capital loss. (NO-LOAD)
                                        PORTFOLIO MANAGER: HENRY VAN DER EB, CFA

GABELLI U.S. TREASURY MONEY MARKET FUND-----------------------------------------
Seeks to invest exclusively in short-term U.S. Treasury  securities.  The Fund's
primary  objective  is to  provide  high  current  income  consistent  with  the
preservation of principal and liquidity.  (NO-LOAD)
                                             PORTFOLIO MANAGER: JUDITH A. RANERI

GABELLI CASH MANAGEMENT SHARES OF
THE TREASURER'S FUND------------------------------------------------------------
Three money market  portfolios  designed to generate  superior  returns  without
compromising  portfolio  safety.  U.S.  Treasury Money Market seeks to invest in
U.S. Treasury bills, notes and bonds. Tax Exempt Money Market seeks to invest in
municipal  securities.  Domestic  Prime  Money  Market  seeks to invest in prime
quality, domestic money market instruments. (NO-LOAD)
                                             PORTFOLIO MANAGER: JUDITH A. RANERI


AN INVESTMENT IN THE ABOVE MONEY MARKET FUNDS IS NEITHER  INSURED NOR GUARANTEED
BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY GOVERNMENT AGENCY.  ALTHOUGH
THE FUNDS SEEK TO PRESERVE THE VALUE OF YOUR  INVESTMENT AT $1.00 PER SHARE,  IT
IS POSSIBLE TO LOSE MONEY BY INVESTING IN THE FUNDS.

GLOBAL SERIES

  GABELLI GLOBAL TELECOMMUNICATIONS FUND
  Seeks  to  invest  in  telecommunications  companies  throughout  the  world -
  targeting  undervalued  companies with strong earnings and cash flow dynamics.
  The Fund's primary objective is capital appreciation. (NO-LOAD)
                                            TEAM MANAGED: MARIO J. GABELLI, CFA,
                                           MARC J. GABELLI AND IVAN ARTEAGA, CFA

  GABELLI  GLOBAL  CONVERTIBLE  SECURITIES  FUND
  Seeks  to  invest   principally  in  bonds  and  preferred  stocks  which  are
  convertible  into common stock of foreign and domestic  companies.  The Fund's
  primary  objective is total return through a combination of current income and
  capital appreciation. (NO-LOAD)
                                                 PORTFOLIO MANAGER: HART WOODSON

  GABELLI GLOBAL GROWTH FUND
  Seeks capital appreciation  through a disciplined  investment program focusing
  on the globalization and  interactivity of the world's  marketplace.  The Fund
  invests in  companies  at the  forefront  of  accelerated  growth.  The Fund's
  primary objective is capital appreciation. (NO-LOAD)
                                              PORTFOLIO MANAGER: MARC J. GABELLI

  GABELLI GLOBAL OPPORTUNITY FUND
  Seeks to  invest in common  stock of  companies  which  have  rapid  growth in
  revenues and earnings and potential for above average capital  appreciation or
  are  undervalued.  The  Fund's  primary  objective  is  capital  appreciation.
  (NO-LOAD)
                                             PORTFOLIO MANAGERS: MARC J. GABELLI
                                                                AND CAESAR BRYAN

GABELLI GOLD FUND---------------------------------------------------------------
Seeks to invest in a global  portfolio of equity  securities  of gold mining and
related  companies.  The Fund's  objective  is long-term  capital  appreciation.
Investment in gold stocks is considered speculative and is affected by a variety
of world-wide economic, financial and political factors. (NO-LOAD)
                                                 PORTFOLIO MANAGER: CAESAR BRYAN

GABELLI INTERNATIONAL GROWTH FUND-----------------------------------------------
Seeks to invest in the equity  securities  of  foreign  issuers  with  long-term
capital   appreciation    potential.    The   Fund   offers   investors   global
diversification. (NO-LOAD)
                                                PORTFOLIO MANAGER:  CAESAR BRYAN

THE SIX FUNDS  ABOVE  INVEST IN  FOREIGN  SECURITIES  WHICH  INVOLVES  RISKS NOT
ORDINARILY  ASSOCIATED WITH INVESTMENTS IN DOMESTIC ISSUES,  INCLUDING  CURRENCY
FLUCTUATION,   ECONOMIC  AND  POLITICAL   RISKS.  THE  FUNDS  LISTED  ABOVE  ARE
DISTRIBUTED BY GABELLI & COMPANY, INC.
- --------------------------------------------------------------------------------

           TO RECEIVE A PROSPECTUS, CALL 1-800-GABELLI (422-3554). THE
            PROSPECTUS GIVES A MORE COMPLETE DESCRIPTION OF THE FUND,
           INCLUDING FEES AND EXPENSES. READ THE PROSPECTUS CAREFULLY
                        BEFORE YOU INVEST OR SEND MONEY.
                              VISIT OUR WEBSITE AT:
                                 WWW.GABELLI.COM
                                    OR, CALL:
                                  1-800-GABELLI
                  1-800-422-3554 [BULLET] 914-921-5100 [BULLET]
                  FAX: 914-921-5118 [BULLET] [email protected]
                    ONE CORPORATE CENTER, RYE, NEW YORK 10580
<PAGE>

                            THE GABELLI U.S. TREASURY
                                MONEY MARKET FUND
                              One Corporate Center
                            Rye, New York 10580-1434
                                  1-800-GABELLI
                                [1-800-422-3554]
                               FAX: 1-914-921-5118
                             HTTP://WWW.GABELLI.COM
                            E-MAIL: [email protected]
                (Net Asset Value may be obtained daily by calling
                         1-800-GABELLI after 6:00 P.M.)


                                BOARD OF TRUSTEES
         Mario J. Gabelli, CFA                 John J. Parker
         CHAIRMAN AND CHIEF                    ATTORNEY-AT-LAW
         INVESTMENT OFFICER                    MCCARTHY, FINGAR, DONOVAN,
         GABELLI ASSET MANAGEMENT INC.         DRAZEN &SMITH

         Anthony J. Colavita                   Karl Otto Pohl
         ATTORNEY-AT-LAW                       FORMER PRESIDENT
         ANTHONY J. COLAVITA, P.C.             DEUTSCHE BUNDESBANK

         Vincent D. Enright                    Anthonie C. van Ekris
         FORMER SENIOR VICE PRESIDENT          MANAGING DIRECTOR
         AND CHIEF FINANCIAL OFFICER           BALMAC INTERNATIONAL, INC.
         KEYSPAN ENERGY CORP.

                                    OFFICERS
         Mario J. Gabelli, CFA                 Ronald S. Eaker
         PRESIDENT                             VICE PRESIDENT

         Bruce N. Alpert                       Judith A. Raneri
         VICE PRESIDENT AND                    VICE PRESIDENT
         TREASURER                             AND PORTFOLIO MANAGER

         James E. McKee                        Henley L. Smith
         SECRETARY                             VICE PRESIDENT

                                   DISTRIBUTOR
                             Gabelli & Company, Inc.

                  CUSTODIAN, TRANSFER AGENT AND DIVIDEND AGENT
                       State Street Bank and Trust Company

                                  LEGAL COUNSEL
                            Willkie, Farr & Gallagher


- --------------------------------------------------------------------------------
This report is submitted for the general  information of the shareholders of The
Gabelli U.S.  Treasury Money Market Fund. It is not authorized for  distribution
to  prospective  investors  unless  preceded  or  accompanied  by  an  effective
prospectus.
- --------------------------------------------------------------------------------
GAB404Q100SR

                                             [Photo of Mario J. Gabelli omitted]

THE
GABELLI
U.S. TREASURY
MONEY MARKET
FUND


                                                              SEMI-ANNUAL REPORT
                                                                  MARCH 31, 2000



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