MATHERS FUND INC
N-30D, 2000-08-30
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                            THE GABELLI MATHERS FUND

                               SEMI-ANNUAL REPORT
                                  JUNE 30, 2000

TO OUR SHAREHOLDERS,

      The  Standard  &  Poor's  500  Index,  NASDAQ  Composite,  and  Dow  Jones
Industrial  Average all reached  record highs during the first half of 2000, but
were  unable to hold  their  gains when a  determined  Federal  Reserve,  set on
slowing the  economy,  continued  to raise the Federal  funds rate to 6.5%,  the
highest  level in ten years.  All three  benchmarks  ended the first half with a
loss.

                                          [PHOTO OF HENRY G. VAN DER EB OMITTED]
                                                             HENRY G. VAN DER EB



[LINE GRAPH OF U.S. FEDERAL RESERVE POLICY INTEREST RATES OMITTED]

      Contained  here in paper  format is a chart  reflecting  the U.S.  Federal
Reserve  Policy  Interest  Rates,  both Federal Funds Rate Target as well as the
Discount  Rate.  This chart was prepared for Gabelli  Mathers Fund by Dr. Edward
Yardeni of Duetsch Bank/Alex Brown. A hard copy is available by calling the Fund
at 800-962-3863. The chart's x-axis represents years, from 1987 through 2001 and
its y-axis shows percentage  points,  from 0 to 10. Year end 1998 is represented
with an arrow  indicating  "Asian Crisis",  and the current rate levels are 6.5%
for Fed Funds Rate Target and 6.0% for the discount rate,  which reflects 6 rate
hikes since 1998.

<PAGE>


INVESTMENT PERFORMANCE AND PORTFOLIO HIGHLIGHTS

      The  Gabelli  Mathers  Fund  total  return  for the six month and one year
periods ended June 30 was 1.93% and 6.04% vs. (0.42)% and 7.24% for the Standard
& Poor's 500 Index, respectively. In an extraordinary display of volatility, the
high-risk NASDAQ Composite,  sporting a bubble-bursting  P/E ratio of 264 at its
all time high on March 10th, jumped 24.1% from year-end 1999, then plunged 37.3%
by May  23rd,  rallied,  and ended  the  first  half  with a return of  (2.54)%,
excluding dividends.  Similarly,  the Dow Jones Industrial Average,  though much
less volatile,  set a record closing high of 11,723 on January 14th,  ending the
first six months of 2000 in the red, with a total return of (8.44)%.

      The Fund's portfolio was 36.4% invested in equity securities on June 30th,
with a majority of stocks  concentrated in takeover target companies  subject to
friendly all cash tender or merger  offers from  financially  strong,  strategic
acquirers. This type of investment is typically held for short time periods. The
remaining stocks,  OfficeMax Inc. (OMX- NYSE), USA Networks Inc. (USAI- NASDAQ),
Seagram Co. (VO- NYSE),  and CMS Energy  Corp.  (CMP-  NYSE),  all have  special
situation  catalysts  in  place  which  have the  potential  to  generate  price
appreciation  by  unlocking  shareholder  value.  The returns from both of these
groups of stocks are  unlikely  to  correlate  with the  movement of the popular
stock market indices.  Additionally,  the Fund had 1.4% and 0.9% short positions
in the S&P 500 and NASDAQ 100, respectively, on June 30th.

      In order to take  advantage of rising short term interest rates during the
first half of the year,  the fixed income  segment of the portfolio was invested
primarily in very short maturity U.S.  Treasury bills.  This approach  minimized
the risk of principal loss which may occur with longer  maturity notes and bonds
when the Federal Reserve is in a tightening mode.

MR. GREENSPAN VS. THE WEALTH EFFECT AND OTHER RISKS FOR STOCKS AND THE ECONOMY

      At mid-year 2000, the primary risk factors for the U.S.  economy and stock
market are rising short term interest rates, equity overvaluation, high consumer
and corporate  debt levels,  a low household  savings rate,  and the record U.S.
current account deficit.

      The Fed has raised the Federal funds  interest rate six times  starting in
June of 1999.  The most  recent 1/2%  increase to 61/2%  occurred on May 16th of
this year,  accompanied  by a 1/2% increase in the discount rate to 6%. Over the
last 85 years,  the discount rate has been raised to 6% only six times:  January
1920,  August  1929,  April 1969,  May 1973,  October 1977 and  September  1987.
Significant  bear markets  followed in all cases  except  1977,  after which the
market  went  sideways  until  August  of 1982.  Consistent  with the 1929  U.S.
experience,  when the Bank of Japan raised its discount  rate to 6% in August of
1990, the Japanese stock market and economic bubble burst.

      In a study  comparing the median values for nine key financial  measures -
including long term interest rates,  dividend yields,  P/E ratios, and inflation
rates during the prior seven cases of a 6% discount  rate - with  today's  data,
Ned Davis  Research  determined  that current  conditions are  potentially  more
hostile  to the  stock  market  and  economic  growth  in eight  out of the nine
categories.

                                       2

<PAGE>

      In March,  the total market value of U.S.  stocks reached a record 177% of
nominal  GDP,  more than twice the peak  level of 1929.  Despite a sharp drop in
internet and technology  stocks,  this ratio only declined to 166% by the end of
June. Mr.  Greenspan has stated his concern that aggregate  stock values are too
high  relative to the economy,  and is raising  interest  rates in an attempt to
gradually  deflate the stock  market  bubble.  If  successful,  the  stimulative
"wealth  effect" of high stock and real estate prices on consumer  spending will
be reduced,  economic  growth will slow,  and the potential  for inflation  will
recede.  The risk is that stocks  decline too far too fast  causing  consumers -
with record low savings,  record stock ownership,  and record high debt relative
to disposable  personal income - to abruptly stop spending,  tipping the economy
into a  recession.  As a recent  reference  point,  the  total  market  value of
Japanese  stocks  relative  to  Japanese  GDP  topped out at 158% in 1989 as the
"economic miracle" began to unravel into a multi-year deflationary contraction.

     U.S. STOCK MARKET  CAPITALIZATION  AS PERCENT OF NOMINAL GDP

      [This chart was prepared for Mathers Fund by Topline Investment  Graphics,
Boulder,  CO. A hard copy is available by calling Mathers Fund at  800-962-3863.
The line is the ratio of stock market capitalization divided by nominal GDP. The
chart's  X-axis  represents  years,  from 1926 through 2000 and its Y-axis shows
percentage points,  from 0 to 175. The average,  since 1926, has been 52.2%. The
high points (August 1929, 81.4%; November 1968, 77.8%; December 1972, 78.10% and
March 2000, 177.1%) were all followed by severe bear markets.  The current value
is 166.0%.

      Three  smaller  charts  appear in a box inset in the main  chart.  Each of
these  charts  shows a  parabolic  price  rise,  a top and the  following  sharp
decline.  The first of the three  charts  reflects the price of the Tokyo Nikkei
stock index and begins in January  1985 at about 11,000 Yen,  continues  through
its peak in November  1989 near 39,000 Yen to its year-end  1992 level of 15,000
Yen. The second of the three charts shows the Dow Jones Industrial  Average from
its 1925 level of 125,  through the 1929 peak of around 375 to its year-end 1931
level of 60. The third of the three charts shows the NASDAQ Composite Index from
its 1990  level of 750,  through  the March  2000 peak of near 5,050 to its June
2000 level of around 3,966.]

      If the U.S.  economy cools,  energy and labor cost inflation is contained,
and  corporate  profits hold up, then the stock market may not decline,  thereby
becoming an exception to the one-sided bearish market  probabilities  implied by
the seven  historical  precedents of a 6% discount  rate.  Ironically,  the U.S.
budget  surplus  and the U.S.  Treasury's  buy-back  of its  notes  and bonds is
partially  offsetting the Fed's effort to raise interest rates. This may prolong
the current credit  tightening cycle and cause short term interest rates to rise
more than would otherwise be the case.

                                       3

<PAGE>

      Since the mid 1990s, the U.S.  consumer and corporate America have been on
a debt financed  spending  spree which has pushed the levels of non Federal debt
to a record 150% of GDP, and total credit  market debt (all sectors) to a highly
leveraged 269% of GDP. High debt levels do not seem burdensome during prosperity
since  they can be  serviced,  paid  down,  and  refinanced  relatively  easily.
However,  there is a limit  to how  much  debt  can be  carried.  Debt  financed
purchases - whether for cars, houses, clothes,  capital spending,  acquisitions,
or  corporate  stock  buy-backs - borrow  final  demand  from the future,  which
creates a spending  vacuum for some  unpredictable  future time period.  Today's
record  absolute  and relative  debt levels have  clearly made the U.S.  economy
increasingly vulnerable to an economic contraction of above average proportions.

                 THE BUBBLE IN STOCKS: AN HISTORICAL PERSPECTIVE

[Contained here in paper format is a chart  reflecting the Standard & Poor's 500
stock index  adjusted  for  inflation.  The X-axis  reflects the years from 1871
through  2000 and its Y-axis is on a  logarithmic  scale and extends  from 15 to
250. The long-term  least squares trend line from 1871 through June 2000 is also
on the chart. The chart was prepared by The Bank Credit Analyst.  A hard copy is
available  by calling  Mathers Fund at  800-962-3863.  The chart is a line chart
with  monthly  data  and  shows  the  extreme  overevaluation  (measured  as the
divergence above the trend line) in the S&P 500 Index.

Also contained within the chart is a table of data as follows:

S&P 500               PRICE        DIVIDEND        P/E
1928 TO 1999          BOOK          YIELD %       RATIO
-----------------     -----        --------       -----
5 MAJOR BOTTOMS        0.9           7.14           7.8
LONG-TERM AVERAGE      1.9           3.82          14.7
6 MAJOR TOPS           2.4           2.94          20.2
SEPT. '29 TOP          3.6           2.86          21.1
AUG. '87 TOP           2.5           2.58          22.9
JULY '99 HIGH *        7.5           1.18          37.0
MAR. '00 HIGH          7.3           1.10          31.7

*Record Overvaluation]

      The  success  of the  "soft  landing"  scenario  appears  to depend on the
optimistic assumption that consumers will continue to spend beyond their incomes
at a time when the  personal  savings  rate is at a record low,  household  debt
service  payments as a percentage of disposable  income are at levels which have
reversed  debt  accumulation  in  the  past,  and  credit  quality  ratings  are
deteriorating.

      Finally,   the  biggest  threat  to  financial  market  stability  is  the
billion-plus dollar a day current account deficit, which represents the increase
in foreign net claims against U.S. residents. Clearly this imbalance, which is a
record  4% of  GDP,  cannot  continue  at  its  current  rate.  The  last  major
interruption  of capital  inflows  was in 1987 when the dollar  plunged,  stocks
crashed,  and interest rates spiked. For now, the markets are saying " it's okay
until it's not okay."


                                       4

<PAGE>

IN CONCLUSION

      The period ahead is likely to be unusually  challenging,  but  potentially
rewarding,  for investors as the speculative excesses that have cumulated during
recent years of  unsustainable  stock market gains and above trend,  debt-driven
economic growth are unwound.  We will endeavor to position the Fund's  portfolio
to take  advantage of the  investment  opportunities  which will be presented by
this once-in-a-generation financial backdrop, while keeping the overall level of
risk within conservative limits.

                                            Sincerely,

                                            /s/signature omitted

                                            HENRY G. VAN DER EB, CFA
                                            President and Portfolio Manager

July 21, 2000

WWW.GABELLI.COM

      Please   visit   us  on  the   Internet.   The   Gabelli   home   page  at
http://www.gabelli.com contains information about Gabelli Asset Management Inc.,
the Gabelli Mutual Funds, IRAs, 401(k)s,  quarterly reports,  closing prices and
other current news. You can e-mail us at [email protected].

MINIMUM INITIAL INVESTMENT

      The Fund's  minimum  initial  investment is $1000 and $250 for regular and
all retirement accounts  respectively,  with no subsequent minimums.  No initial
minimum is required for  accounts  starting an Automatic  Investment  Plan.  The
Gabelli  Mathers Fund and other Gabelli  Mutual Funds are available  through the
no-transaction fee programs at many major discount brokerage firms.

AVERAGE ANNUAL RETURNS *

                            1 YR      5 YRS        10 YRS       34 YRS **
                            ----      -----        ------       ---------

GABELLI MATHERS FUND        6.04%     1.08%         2.39%        11.25%
Standard & Poor's 500       7.24%    23.80%        17.79%        12.32%

*   All periods ended 6-30-00.  Total returns and average annual returns reflect
    changes  in  share  price  and  reinvestment  of  dividends  and  are net of
    expenses. Of course, returns represent past performance and do not guarantee
    future results.  Investment returns and the principal value of an investment
    will fluctuate. When shares are redeemed they may be worth more or less than
    their original cost. The S&P 500 Index is an unmanaged index of stock market
    performance.

**  From commencement of investment operations on August 19, 1965.

NOTE: The views expressed in this report reflect those of the portfolio  manager
only through the end of the period covered in this report.  The manager's  views
are subject to change at any time based on market and other conditions.

                                       5

<PAGE>

THE GABELLI MATHERS FUND
PORTFOLIO OF INVESTMENTS -- JUNE 30, 2000 (UNAUDITED)
--------------------------------------------------------------------------------
                                                                      MARKET
    SHARES                                            COST            VALUE
    ------                                            ----           --------


              COMMON STOCKS -- 35.6%
              BUSINESS SERVICES -- 5.8%
     70,000   Primark Corp. .................    $  2,615,375      $  2,607,500
     60,000   Verio Inc.+ ...................       3,491,252         3,329,062
                                                 ------------     -------------
                                                    6,106,627         5,936,562
                                                 ------------     -------------
              COMPUTER SOFTWARE AND SERVICES -- 0.8%
     50,000   Policy Management
               Systems Corp.+ ...............         752,075           768,750
                                                 ------------     -------------
              EDUCATIONAL SERVICES -- 0.5%
     30,000   Quest Education Corp.+ ........         543,125           541,875
                                                 ------------     -------------
              ENERGY AND UTILITIES -- 6.2%
     76,000   CMP Group Inc. ................       2,206,319         2,227,750
        400   Eastern Enterprises ...........          24,870            25,200
    117,300   United Water Resources Inc. ...       4,053,300         4,090,837
                                                 ------------     -------------
                                                    6,284,489         6,343,787
                                                 ------------     -------------
              ENTERTAINMENT -- 5.8%
     80,000   Seagram Co. ...................       4,772,127         4,640,000
     60,000   USA Networks Inc.+ ............       1,378,438         1,297,500
                                                 ------------     -------------
                                                    6,150,565         5,937,500
                                                 ------------     -------------
              FINANCIAL SERVICES -- 2.7%
     15,000   Financial Security
               Assurance Holdings Ltd. ......       1,132,312         1,138,125
     30,000   ReliaStar Financial Corp. .....       1,576,500         1,573,125
                                                 ------------     -------------
                                                    2,708,812         2,711,250
                                                 ------------     -------------
              FOOD AND BEVERAGE -- 5.8%
     70,000   Bestfoods Inc. ................       4,858,887         4,847,500
     40,000   Nabisco Group Holdings Corp. ..       1,070,752         1,037,500
                                                 ------------     -------------
                                                    5,929,639         5,885,000
                                                 ------------     -------------
              HEALTH CARE -- 3.9%
     25,000   Shared Medical
               Systems Corp. ................       1,716,250         1,823,438
     75,000   Summit Technology Inc.+ .......       1,392,967         1,415,625
     20,000   Wesley Jessen
               VisionCare Inc.+ .............         746,650           751,250
                                                 ------------     -------------
                                                    3,855,867         3,990,313
                                                 ------------     -------------
              RETAIL -- 4.1%
    835,000   OfficeMax Inc.+ ...............       5,013,882         4,175,000
                                                 ------------     -------------
              TOTAL COMMON STOCKS                  37,345,081        36,290,037
                                                 ------------     -------------

              PREFERRED STOCKS -- 0.8%
              ENERGY AND UTILITIES -- 0.8%
     30,000   CMS Energy Corp.,
               8.75% Cv. Pfd. ...............         845,003           840,000
                                                 ------------     -------------


 PRINCIPAL                                                          MARKET
  AMOUNT                                        COST                VALUE
 ---------                                      ----               -------
              U.S. GOVERNMENT OBLIGATIONS -- 58.5%
$60,000,000   U.S. Treasury Bills,
               5.38% to 5.51%++,
               due 07/20/00 to 08/17/00 .....    $ 59,592,256     $  59,592,256
                                                 ------------     -------------

              REPURCHASE AGREEMENTS -- 5.7%
  1,000,000   Agreement with ABN Amro,
               6.40%, dated 06/30/00, due 07/03/00,
               proceeds at maturity
               $1,000,533 (a) ...............       1,000,000         1,000,000
  4,782,384   Agreement with State Street
               Bank & Trust Co., 6.50%,
               dated 06/30/00,
               due 07/03/00, proceeds
               at maturity $4,784,975 (b) ...       4,782,384         4,782,384
                                                 ------------     -------------
              TOTAL REPURCHASE
               AGREEMENTS ...................       5,782,384         5,782,384
                                                 ------------     -------------
              TOTAL
               INVESTMENTS -- 100.6% ........    $103,564,724       102,504,677
                                                 ============
               OTHER ASSETS AND
               LIABILITIES (NET) -- (0.6%) ..................          (625,602)
                                                                   ------------
              NET ASSETS -- 100.0%
               (8,371,919 shares outstanding) ...............      $101,879,075
                                                                   ============
-----------------
                                                                      MARKET
                                   SHARES          PROCEEDS           VALUE
                                  --------      --------------    --------------
SECURITIES SOLD SHORT

COMMON STOCK
NASDAQ 100 Trust .............     10,000         (946,968.41)      (931,875.00)
S&P 500 Depositary Receipts ..     10,000       (1,466,951.08)    (1,452,812.50)
                                                 ------------      ------------
TOTAL SECURITIES
 SOLD SHORT                                     (2,413,919.49)    (2,384,687.50)
                                                =============     ==============
-----------------
              For Federal tax purposes:
              Aggregate cost ................................      $103,564,724
                                                                   ============
              Gross unrealized appreciation .................      $    216,232
              Gross unrealized depreciation .................        (1,276,279)
                                                                   ------------
              Net unrealized depreciation ...................      $ (1,060,047)
                                                                   ============
-----------------
(a) Collateralized by U.S.  Treasury Bond,  12.50%,  due 08/15/14,  market value
    $1,022,195.
(b) Collateralized  by U.S. Treasury Bond, 9.00%, due 11/15/18,
    market value $4,884,406.
+   Non-income producing security.
++  Represents annualized yield at date of purchase.

                 See accompanying notes to financial statements.


                                       6

<PAGE>

                            THE GABELLI MATHERS FUND

STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 2000 (UNAUDITED)
-------------------------------------------------------------
ASSETS:
   Investments, at value (Cost $103,564,724) ..  $102,504,677
   Cash .......................................       381,134
   Dividends and interest receivable ..........       111,598
   Receivable for investments sold ............     2,413,919
                                                 ------------
   TOTAL ASSETS ...............................   105,411,328
                                                 ------------
LIABILITIES:
   Payable for investments purchased ..........     1,019,020
   Payable for Fund shares redeemed ...........           132
   Payable for investment advisory fees .......        63,480
   Payable for distribution fees ..............        20,993
   Securities sold short, at value
     (Proceeds $2,413,919) ....................     2,384,687
   Payable to custodian .......................         5,200
   Other accrued expenses and liabilities .....        38,741
                                                 ------------
   TOTAL LIABILITIES ..........................     3,532,253
                                                 ------------
   NET ASSETS applicable to 8,371,919
     shares outstanding .......................  $101,879,075
                                                 ============
NET ASSETS CONSIST OF:
   Shares of beneficial interest, at par value   $  8,371,919
   Additional paid-in capital .................   130,563,189
   Accumulated net investment income ..........     1,901,333
   Accumulated net realized loss on investments
     and futures contracts ....................   (37,926,551)
   Net unrealized appreciation on investments .    (1,030,815)
                                                 ------------
   TOTAL NET ASSETS ...........................  $101,879,075
                                                 ============
   NET ASSET VALUE, offering and redemption
     price per share ($101,879,075 / 8,371,919
     shares  outstanding; 100,000,000 shares
     authorized of $1.00 par value) ...........        $12.17
                                                       ======

STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 2000 (UNAUDITED)
-------------------------------------------------------------
INVESTMENT INCOME:
   Dividends ..................................  $    388,952
   Interest ...................................     2,153,810
                                                 ------------
   TOTAL INVESTMENT INCOME ....................     2,542,762
                                                 ------------
EXPENSES:
   Investment advisory fees ...................       389,424
   Distribution fees ..........................       128,435
   Trustees' fees .............................        34,166
   Legal and audit fees .......................        29,275
   Custodian fees .............................        25,849
   Registration fees ..........................        15,534
   Shareholder services fees ..................        14,485
   Shareholder communications expenses ........         4,018
   Dividends on securities sold short .........        23,484
   Miscellaneous expenses .....................        10,381
                                                 ------------
   TOTAL EXPENSES .............................       675,051
                                                 ------------
   NET INVESTMENT INCOME ......................     1,867,711
                                                 ------------
NET REALIZED AND UNREALIZED GAIN (LOSS)
   ON INVESTMENTS:
   Net realized gain on investments and
     futures contracts ........................     3,502,981
   Net realized loss on securities sold short .    (2,202,695)
   Net change in unrealized depreciation on
     investments and securities sold short ....    (1,202,496)
                                                 ------------
   NET REALIZED AND UNREALIZED GAIN
     ON INVESTMENTS AND FUTURES CONTRACTS .....        97,790
                                                 ------------
   NET INCREASE IN NET ASSETS RESULTING
     FROM OPERATIONS ..........................  $  1,965,501
                                                 ============

STATEMENT OF CHANGES IN NET ASSETS
--------------------------------------------------------------------------------
<TABLE>
<CAPTION>

                                                                                SIX MONTHS ENDED
                                                                                  JUNE 30, 2000                YEAR ENDED
                                                                                   (UNAUDITED)               DECEMBER 31, 1999
                                                                                ----------------             ------------------
<S>                                                                                <C>                          <C>
OPERATIONS:
  Net investment income ...................................................        $  1,867,711                 $  3,656,655
  Net realized gain on investments and futures contracts ..................           3,502,981                    4,428,251
  Net realized loss on securities sold short ..............................          (2,202,695)                  (1,893,870)
  Net change in unrealized depreciation on investments ....................          (1,202,496)                    (445,493)
                                                                                   ------------                 ------------
  NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS ....................           1,965,501                    5,745,543
                                                                                   ------------                 ------------
DISTRIBUTIONS TO SHAREHOLDERS:
  Net investment income ...................................................                  --                   (3,638,301)
                                                                                   ------------                 ------------
  TOTAL DISTRIBUTIONS TO SHAREHOLDERS .....................................                  --                   (3,638,301)
                                                                                   ------------                 ------------
 SHARE TRANSACTIONS:
  Net decrease in net assets from shares of beneficial interest transactions         (4,779,799)                  (5,961,454)
                                                                                   ------------                 ------------
  NET DECREASE IN NET ASSETS ..............................................          (2,814,298)                  (3,854,212)
NET ASSETS:
  Beginning of period ......................................................        104,693,373                  108,547,585
                                                                                   ------------                 ------------
  End of period ...........................................................        $101,879,075                 $104,693,373
                                                                                   ============                 ============
</TABLE>

                 See accompanying notes to financial statements.

                                       7

<PAGE>

THE GABELLI MATHERS FUND
NOTES TO FINANCIAL STATEMENTS (UNAUDITED)
--------------------------------------------------------------------------------
1. ORGANIZATION. The Gabelli Mathers Fund (the "Fund") was organized on June 17,
1999 as a Delaware business trust. The Fund commenced  investment  operations on
October 1, 1999 as the successor to the Mathers Fund,  Inc. (the "Mathers Fund")
which was  organized  on March 31, 1965 as a Maryland  corporation.  The Mathers
Fund  commenced  investment  operations  on  August  19,  1965.  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 long-term capital appreciation.

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.  Portfolio  securities  listed or  traded  on a  nationally
recognized securities exchange, quoted by the National Association of Securities
Dealers Automated Quotations, Inc. ("Nasdaq") or traded on foreign exchanges are
valued at the last sale price on that  exchange  as of the close of  business on
the day the  securities  are being  valued (if there were no sales that day, the
security is valued at the  average of the  closing  bid and asked  prices or, if
there were no asked  prices  quoted on that day,  then the security is valued at
the closing bid price on that day,  except for open short  positions,  which are
valued at the last  asked  price).  All  other  portfolio  securities  for which
over-the-counter  market  quotations  are  readily  available  are valued at the
latest average of the bid and asked prices.  Portfolio securities traded on more
than one  national  securities  exchange or market are valued  according  to the
broadest and most  representative  market,  as determined by Gabelli Funds,  LLC
(the  "Adviser").  Securities  and assets for which  market  quotations  are not
readily  available  are valued at their fair value as  determined  in good faith
under procedures  established by and under the general  supervision of the Board
of Trustees.  Short-term debt securities with remaining maturities of 60 days or
less are valued at amortized cost,  unless the Trustees  determine such does not
reflect the  securities'  fair  value,  in which case these  securities  will be
valued at their fair  value as  determined  by the  Trustees.  Debt  instruments
having a  maturity  greater  than 60 days are  valued at the  highest  bid price
obtained from a dealer maintaining an active market in those securities.

REPURCHASE  AGREEMENTS.  The Fund may  enter  into  repurchase  agreements  with
primary  government  securities dealers recognized by the Federal Reserve Board,
with member banks of the Federal Reserve System or with other brokers or dealers
that meet credit guidelines established by the Adviser and reviewed by the Board
of Trustees.  Under the terms of a typical repurchase agreement,  the Fund takes
possession  of an  underlying  debt  obligation  subject to an obligation of the
seller to repurchase,  and the Fund to resell,  the obligation at an agreed-upon
price and time, thereby  determining the yield during the Fund's holding period.
The Fund will always receive and maintain  securities as collateral whose market
value, including accrued interest,  will be at least equal to 100% of the dollar
amount  invested by the Fund in each  agreement.  The Fund will make payment for
such  securities  only upon  physical  delivery  or upon  evidence of book entry
transfer of the collateral to the account of the  custodian.  To the extent that
any repurchase transaction exceeds one business day, the value of the collateral
is marked-to-market on a daily basis to maintain the adequacy of the

                                       8

<PAGE>

THE GABELLI MATHERS FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED) (UNAUDITED)
--------------------------------------------------------------------------------
collateral.  If the seller defaults and the value of the collateral  declines or
if  bankruptcy  proceedings  are  commenced  with  respect  to the seller of the
security, realization of the collateral by the Fund may be delayed or limited.

FUTURES  CONTRACTS.  The Fund may engage in futures contracts for the purpose of
hedging  against  changes in the value of its  portfolio  securities  and in the
value of  securities  it  intends  to  purchase.  Upon  entering  into a futures
contract,  the Fund is required to deposit  with the broker an amount of cash or
cash equivalents equal to a certain  percentage of the contract amount.  This is
known as the "initial margin." Subsequent payments ("variation margin") are made
or  received by the Fund each day,  depending  on the daily  fluctuation  of the
value of the  contract.  The daily  changes  in the  contract  are  included  in
unrealized gains or losses. The Fund recognizes a realized gain or loss when the
contract is closed. At June 30, 2000, there were no open futures contracts.

There are several  risks in  connection  with the use of futures  contracts as a
hedging device. The change in value of futures contracts  primarily  corresponds
with the value of their underlying instruments, which may not correlate with the
change in value of the hedged investments.  In addition,  there is the risk that
the Fund may not be able to  enter  into a  closing  transaction  because  of an
illiquid secondary market.

SECURITIES  SOLD SHORT. A short sale involves  selling a security which the Fund
does not own. The proceeds  received for short sales are recorded as liabilities
and the Fund records an unrealized  gain or loss to the extent of the difference
between the proceeds  received  and the value of the open short  position on the
day of  determination.  The Fund records a realized  gain or loss when the short
position is closed out. By entering into a short sale, the Fund bears the market
risk of an unfavorable change in price of the security sold short.  Dividends on
short sales are recorded as an expense by the Fund on the  ex-dividend  date and
interest expense is recorded on the accrual basis.

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.
Dividend income is recorded on the ex-dividend date.

DIVIDENDS AND  DISTRIBUTIONS  TO  SHAREHOLDERS.  Dividends and  distributions to
shareholders  are recorded on the ex-dividend  date.  Income  distributions  and
capital  gain  distributions  are  determined  in  accordance  with  income  tax
regulations  which may differ from  generally  accepted  accounting  principles.
These differences are primarily due to differing  treatments of income and gains
on  various  investment  securities  held by the Fund,  timing  differences  and
differing characterization of distributions made by the Fund.

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.

                                       9
<PAGE>


THE GABELLI MATHERS FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED) (UNAUDITED)
--------------------------------------------------------------------------------
The Fund has a net capital loss  carryforward for Federal income tax purposes at
December 31, 1999 of $39,220,871. This capital loss carryforward is available to
reduce future distributions of net capital gains to shareholders.  $9,124,017 of
the loss  carryforward  is  available  through  2003;  $22,226,886  is available
through 2004; and $7,869,968 is available through 2006.

3.  INVESTMENT  ADVISORY  AGREEMENT.  The Fund has  entered  into an  investment
advisory  agreement (the "Advisory  Agreement")  with the Adviser which provides
that the Fund will pay the Adviser a fee,  computed  daily and paid monthly,  at
the annual rate of 0.75% of the first  $100,000,000  of the Fund's average daily
net assets  plus  1.00% of average  daily net  assets  over  $100,000,000  until
September 30, 2001.  After  September 30, 2001,  the Fund will pay the Adviser a
fee, computed daily and paid monthly, at the annual rate of 1.00% on all average
daily net  assets.  In  accordance  with the  Advisory  Agreement,  the  Adviser
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.

4. DISTRIBUTION PLAN. On October 1, 1999, the Fund's Board of Trustees adopted a
distribution  plan (the  "Plan")  pursuant to Rule 12b-1 under the 1940 Act. For
the six months ended June 30, 2000, the Fund incurred distribution costs payable
to Gabelli & Company,  Inc., an affiliate of the Adviser, of $128,435,  or 0.25%
of average daily net assets, the annual limitation under the Plan. Such payments
are accrued daily and paid monthly.

5.  PORTFOLIO  SECURITIES.  Purchases and sales of securities for the six months
ended June 30, 2000, other than short-term securities,  aggregated  $112,088,263
and $108,776,288, respectively.

6. TRANSACTIONS WITH AFFILIATES.  During the six months ended June 30, 2000, the
Fund paid brokerage commissions of $204,291 to Gabelli & Company, Inc.

7. SHARES OF BENEFICIAL INTEREST.  Transactions in shares of beneficial interest
were as follows:
<TABLE>
<CAPTION>

                                                            SIX MONTHS ENDED                   YEAR ENDED
                                                              JUNE 30, 2000                 DECEMBER 31, 1999
                                                       -------------------------       ---------------------------
                                                        SHARES          AMOUNT          SHARES          AMOUNT
                                                       --------        ---------       ----------     ------------
<S>                                                    <C>           <C>               <C>            <C>
Shares sold .......................................     266,430      $ 3,202,784        1,778,384     $ 21,299,727
Shares issued upon reinvestment of dividends ......          --                --         274,885        3,271,129
Shares redeemed ...................................    (663,384)      (7,982,583)      (2,536,839)     (30,532,310)
                                                        -------      -----------       ----------     ------------
    Net decrease ..................................    (396,954)     $(4,779,799)        (483,570)    $ (5,961,454)
                                                        =======      ===========       ==========     ============
</TABLE>

                                       10

<PAGE>

THE GABELLI MATHERS FUND
FINANCIAL HIGHLIGHTS
--------------------------------------------------------------------------------
Selected data for a share of beneficial interest outstanding throughout each
period:
<TABLE>
<CAPTION>

                                         SIX MONTHS ENDED                     YEAR ENDED DECEMBER 31,
                                           JUNE 30, 2000   -------------------------------------------------------------------
                                            (UNAUDITED)        1999            1998          1997         1996          1995
                                         ----------------    --------       --------      --------      --------      --------
<S>                                           <C>            <C>            <C>           <C>           <C>           <C>
OPERATING PERFORMANCE:
   Net asset value, beginning of period       $  11.94       $  11.73       $  13.06      $  13.27      $  13.75      $  13.55
                                              --------       --------       --------      --------      --------      --------
   Net investment income                          0.22           0.46           0.58          0.53          0.40          0.60
   Net realized and unrealized
     gain (loss) on investments
     and securities sold short                    0.01           0.21          (1.26)        (0.13)        (0.41)         0.35
                                              --------       --------       --------      --------      --------      --------
    Total from investment operations              0.23           0.67          (0.68)         0.40         (0.01)         0.95
                                              --------       --------       --------      --------      --------      --------
DISTRIBUTIONS TO SHAREHOLDERS:
   Net investment income                            --          (0.46)         (0.65)        (0.61)        (0.47)        (0.72)
   Net realized gain on investments                 --             --             --             --            --        (0.03)
                                              --------       --------       --------      --------      --------      --------
   Total distributions                              --          (0.46)         (0.65)        (0.61)        (0.47)        (0.75)
                                              --------       --------       --------      --------      --------      --------
   NET ASSET VALUE, END OF PERIOD             $  12.17       $  11.94       $  11.73      $  13.06      $  13.27      $  13.75
                                              ========       ========       ========      ========      ========      ========
   Total return+                                 1.93%          5.73%        (5.21)%         3.01%       (0.07)%         7.01%
                                              ========       ========       ========      ========      ========      ========
RATIOS TO AVERAGE NET ASSETS
   AND SUPPLEMENTAL DATA:
   Net assets, end of period (in 000's)       $101,879       $104,693       $108,548      $138,404      $171,596      $232,303
   Ratio of net investment income
     to average net assets                       3.63%(b)       3.50%          4.56%         3.96%         2.96%         4.25%
   Ratio of operating expenses
     to average net assets (a)                   1.31%(b)       1.24%          1.16%         1.07%         1.03%         0.98%
   Portfolio turnover rate                        424%           922%            67%           50%           38%           58%
</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) The Fund  incurred  dividend  expense on  securities  sold short for the six
    months  ended June 30, 2000 and the years ended  December 31, 1999 and 1998.
    If the  dividend  expense  had not been  incurred,  the ratios of  operating
    expenses  to average  net assets  would  have been  1.27%,  1.24% and 1.12%,
    respectively.
(b) Annualized.

                 See accompanying notes to financial statements.

                                       11

<PAGE>

                THE GABELLI MATHERS 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           Karl Otto Pohl
CHAIRMAN AND CHIEF              FORMER PRESIDENT
INVESTMENT OFFICER              DEUTSCHE BUNDESBANK
GABELLI ASSET MANAGEMENT INC.

Felix J. Christiana             Anthony R. Pustorino
FORMER SENIOR VICE PRESIDENT    CERTIFIED PUBLIC ACCOUNTANT
DOLLAR DRY DOCK SAVINGS BANK    PROFESSOR, PACE UNIVERSITY

Anthony J. Colavita             Werner J. Roeder, MD
ATTORNEY-AT-LAW                 MEDICAL DIRECTOR
ANTHONY J. COLAVITA, P.C.       LAWRENCE HOSPITAL

Vincent D. Enright              Jack O. Vance
FORMER SENIOR VICE PRESIDENT    MANAGING DIRECTOR
AND CHIEF FINANCIAL OFFICER     MANAGEMENT RESEARCH INC.
KEYSPAN ENERGY CORP.

Jon P. Hedrich                  Henry G. Van der Eb, CFA
FORMER PRESIDENT AND PARTNER    PRESIDENT AND CHIEF
STEINER DIAMOND INSTITUTIONAL   EXECUTIVE OFFICER
SERVICES                        THE GABELLI MATHERS FUND

Robert E. Kohnen                Anthonie C. van Ekris
FORMER VICE PRESIDENT AND       MANAGING DIRECTOR
INVESTMENT MANAGER              BALMAC INTERNATIONAL, INC.
PROTECTION MUTUAL INSURANCE

          OFFICERS AND PORTFOLIO MANAGERS
Henry G. Van der Eb, CFA        Anne E. Morrissy, CFA
PRESIDENT AND                   EXECUTIVE VICE PRESIDENT
PORTFOLIO MANAGER

Bruce N. Alpert                 James E. McKee
EXECUTIVE VICE PRESIDENT        SECRETARY
AND TREASURER

                       DISTRIBUTOR
                  Gabelli & Company, Inc.

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

                    LEGAL COUNSEL
         Skadden, Arps, Slate, Meagher & Flom LLP

--------------------------------------------------------------------------------
This report is submitted for the general  information of the shareholders of The
Gabelli  Mathers Fund. It is not  authorized  for  distribution  to  prospective
investors unless preceded or accompanied by an effective prospectus.
--------------------------------------------------------------------------------
GAB1726Q200SR

                                                [Photo of Mario Gabelli omitted]

                                          THE
                                          GABELLI
                                          MATHERS
                                          FUND



                                                              SEMI-ANNUAL REPORT
                                                                   JUNE 30, 2000


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