GABELLI INVESTOR FUNDS INC
N-30D, 2000-08-29
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                              THE GABELLI ABC FUND

                               SEMI-ANNUAL REPORT
                                  JUNE 30, 2000

         "GIVE A MAN A FISH AND YOU FEED HIM FOR A DAY.
         TEACH HIM HOW TO ARBITRAGE AND YOU FEED HIM FOREVER."
                - Warren Buffett

      [Graphic omitted of book cover "Deals...Deals...and More Deals]

TO OUR SHAREHOLDERS,

      At the end of the first  quarter of 2000,  long-dormant  value stocks were
finally attracting attention. The sharp technology stock correction, which began
in the second week of March,  revived the  antiquated  notion that the  severely
depressed stocks of high quality companies in out-of-favor industry groups might
be an  attractive  alternative  to the richly  priced  technology  stocks.  This
all-but-forgotten  concept gained credence as the previous drivers of the NASDAQ
continued to plummet in April.  However,  investors quickly lost interest in the
merits of value investing when technology  stocks began  rebounding in late May.
By the end of the second quarter, all eyes were once again focused on technology
stocks,  leaving the rest of the market adrift. The Dow Jones Industrial Average
("DJIA")  and  Standard & Poor's 500 Index  materially  outperformed  the NASDAQ
Composite Index during the second quarter, but momentum had clearly shifted back
to technology stocks at its close.

      While public market  speculators  remain  ambivalent  about  fundamentally
inexpensive,  high  quality  companies  in more  prosaic  businesses,  the  true
connoisseurs  of  value--corporate  acquirers and leveraged  buyout  groups--are
aggressively  taking  advantage of the  attractive  merchandise  in the market's
discount bin. And, of course, value investors like us call this "our space."

      The ABC Fund's conservative  portfolio mix of undervalued  equities,  U.S.
Treasury securities,  and risk arbitrage  investments helped it to a respectable
2.28% return this quarter and an impressive  4.77% gain for the first six months
of 2000.
<PAGE>

INVESTMENT RESULTS (a)
<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------------------------------
                                                                          Quarter
                                                   -----------------------------------------
                                                     1st         2nd        3rd         4th          Year
                                                     ---         ---        ---         ---          ----
<S>                                                 <C>         <C>        <C>         <C>          <C>
  2000:   Net Asset Value .....................     $9.67       $9.89       --           --           --
          Total Return ........................      2.4%        2.3%       --           --           --
--------------------------------------------------------------------------------------------------------------
  1999:   Net Asset Value .....................     $9.65      $10.20     $10.21        $9.44        $9.44
          Total Return ........................      0.6%        5.7%       0.1%         2.4%          9.0%
--------------------------------------------------------------------------------------------------------------
  1998:   Net Asset Value .....................    $10.64      $10.68     $10.16        $9.59        $9.59
          Total Return ........................      4.0%        0.4%      (4.9)%       11.9%         11.1%
--------------------------------------------------------------------------------------------------------------
  1997:   Net Asset Value .....................     $9.98      $10.45     $10.74       $10.23       $10.23
          Total Return ........................      1.4%        4.7%       2.8%         3.3%         12.8%
--------------------------------------------------------------------------------------------------------------
  1996:   Net Asset Value .....................    $10.10      $10.16      $9.77        $9.84        $9.84
          Total Return ........................      4.1%        0.6%       0.8%         2.2%          7.8%
--------------------------------------------------------------------------------------------------------------
  1995:   Net Asset Value .....................     $9.94      $10.14     $10.41        $9.71        $9.71
          Total Return ........................      3.9%        2.0%       2.7%         2.2%         11.2%
--------------------------------------------------------------------------------------------------------------
  1994:   Net Asset Value .....................    $10.12      $10.11     $10.42        $9.57        $9.57
          Total Return ........................      0.9%       (0.1)%      3.1%         0.6%          4.5%
--------------------------------------------------------------------------------------------------------------
  1993:   Net Asset Value .....................      --        $10.10     $10.63       $10.03       $10.03
          Total Return ........................      --          1.0%(b)    5.2%         2.6%          9.1%(b)
--------------------------------------------------------------------------------------------------------------
</TABLE>


                    Dividend History
-------------------------------------------------------
Payment (ex) Date    Rate Per Share  Reinvestment Price
------------------   --------------  ------------------
December 27, 1999        $1.000          $ 9.32
December 28, 1998        $1.763          $ 9.50
December 29, 1997        $0.860          $10.17
December 27, 1996        $0.146          $ 9.83
September 30, 1996       $0.470          $ 9.77
December 28, 1995        $0.930          $ 9.71
December 28, 1994        $0.910          $ 9.52
December 31, 1993        $0.880          $10.03


--------------------------------------------------------------
        Average Annual Returns - June 30, 2000 (a)
        ------------------------------------------
  1 Year ......................................      7.36%
  3 Year ......................................     10.11%
  Life of Fund (b) ............................      9.86%
--------------------------------------------------------------

(a) Total returns and average annual returns  reflect changes in share price and
reinvestment  of dividends  and are net of expenses.  The net asset value of the
Fund is reduced on the ex-dividend  (payment) date by the amount of the dividend
paid. 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. (b) From commencement of investment operations on May 14, 1993.
--------------------------------------------------------------------------------

INVESTMENT PERFORMANCE

      For the second  quarter  ended June 30, 2000,  the Gabelli ABC Fund's (the
"Fund") total return was 2.28%.  The Lipper U.S.  Treasury  Money Market Average
had a total return of 1.33% over the same period.  The Lipper  Average  reflects
the average performance of mutual funds classified in this particular  category.
The Fund was up 7.36% over the  trailing  twelve-month  period.  The Lipper U.S.
Treasury Money Market Average rose 4.84% over the same twelve-month period.

[Graphic omitted]
Pyramid text as follows:
EPS
PMV
Management
Cash Flow
Research


                                        2

<PAGE>

      For the  five-year  period  ended June 30,  2000,  the Fund's total return
averaged 10.11% annually versus an average annual return of 4.79% for the Lipper
U.S. Treasury Money Market Average. Since inception on May 14, 1993 through June
30, 2000, the Fund had a cumulative total return of 95.59%,  which equates to an
average annual total return of 9.86%.

COMMENTARY

"WHAT, ME WORRY?"

      The labor market remains tight and the threat of wage-driven  inflation is
quite  real.  Despite  six  Federal  Reserve  interest  rate hikes over the last
eighteen  months,  the  economy  is still  growing at a pace that  troubles  the
monetary authorities. This is also an election year. While the campaign has been
a relatively quiet one, the rhetoric is sure to heat up as we approach November.
Political  posturing on economic  issues,  principally  how to  re-allocate  the
growing budget surplus, may rattle the financial markets.  Finally,  while there
are large pockets of attractive  fundamental  values in the equity markets,  the
overall market,  as measured by the S&P 500 Index, is still rather richly priced
relative to historic norms.

      Of concern to us is the soaring  trade  deficit.  Thus far,  the world has
been happy to finance  this  deficit by buying U.S.  stocks and bonds.  This has
worked out well for all  concerned.  However,  if we see  inflation  continue to
trend higher and if the U.S. financial markets sputter,  international investors
may seek  opportunities  elsewhere.  Reduced  global  demand for U.S.  financial
assets may have a greater  impact on stocks  and bonds  than the  aforementioned
economic,  political,  and market issues. If international  demand dries up, the
favorable  supply/demand  dynamics the U.S.  financial markets have enjoyed over
the last decade may be disrupted.  In addition,  the Federal Reserve may have to
pump up  interest  rates  even  further,  and at the wrong  time,  to defend the
dollar.

      That is the dark  side.  The  bright  side is that we are  finally  seeing
evidence  of  economic  deceleration.  Housing  starts  and home  sales are down
substantially,  and with the exception of oil, commodity prices have stabilized.
The most recently released  employment  numbers were relatively benign and there
are indications  that consumer  confidence has been dented.  For the time being,
the  Federal  Reserve  has spared us an  additional  rate  hike.  We just may be
returning  to a  "Goldilocks"  economy--not  too  hot,  not too  cool,  but just
right--that  will help propel stocks higher.  We have labeled this rosy economic
scenario  "Soft  Landing Part II".  Ideally,  we will see a much broader  market
advance in which companies in a wider range of industries participate.

A TUG OF WAR

      For brief periods during the second quarter, market activity looked like a
tug-of-war  between  technology  and value stocks.  When the  tech-heavy  NASDAQ
Composite was down, the  value-oriented  Dow Jones was up, and vice-versa.  This
raises the  question of whether  tech stocks must fall before  stocks from value
sectors may rise, and if so, what economic and market phenomena may cause such a
reversal in fortune.

      Let's  examine the economic  hypothesis  being used to glorify  technology
stocks and relegate value stocks to investment  purgatory.  The NASDAQ Composite
and DJIA  began to diverge  at the end of the  second  quarter of 1999,  when it
became clear the Federal  Reserve was  determined to raise  short-term  interest
rates until the economy slowed.  Technology  company earnings were thought to be
largely immune

                                        3

<PAGE>

to higher interest rates and a slower economy--an argument that had validity due
to strong secular growth trends in many tech sectors.  Earnings for economically
sensitive  companies  would  trend  lower  as the  economy  decelerated--also  a
reasonable  assumption.  Despite the Federal Reserve's best efforts, the economy
continued  to barrel along and we saw solid  earnings  gains across the industry
group  spectrum.  Tech stocks were  grandly  rewarded  for meeting or  exceeding
earnings  estimates,  but better than  expected  earnings for companies in other
industries  were largely  ignored.  At the close of this reporting  period,  the
NASDAQ Composite had a trailing  price/earnings ("P/E") multiple of 128.1, while
the Dow Jones Industrials had a trailing P/E of 21.8.

     P/Es are a function of earnings  growth rates and interest rates. A company
growing  earnings at 30% per year  deserves a higher P/E than a company  growing
earnings  at 10%  annually.  However,  P/Es are also a  reflection  of  investor
sentiment.  Presently, quality tech stocks are priced as if nothing can go wrong
and quality companies in other industries are priced as if nothing can go right.
This challenges economic reality.

      Wall Street  analysts are paid to look  forward,  but their  forecasts are
generally  strongly  biased by the past.  Over the last several  years,  leading
technology companies' earnings have beaten consensus projections.  Analysts have
responded  by raising  the  earnings  bar,  at least in part to justify  soaring
valuations.  If the economy slows, technology spending may moderate as well, and
tech companies' earnings may fall short of what we believe are overly optimistic
forecasts.   High  valuations   leave  little  room  for  even  modest  earnings
disappointments. Just ask the folks at Qualcomm and Lucent Technologies.

      As for the rest of the market,  if the economy is  slowing,  earnings  for
economically  sensitive companies may have peaked, albeit a year later than many
anticipated.  Cyclical  stocks  have  received  little  tribute  for better than
expected  earnings.  In fact, we believe that  significantly  lower earnings are
already  baked into  valuations.  So, any  pleasant  surprises  should  generate
enthusiasm.  Other  industry  groups such as food and drug stocks  suffered more
from investor indifference than any present or potential earnings  dislocations.
Media stocks,  which stalled in 2000 after  exceptionally  strong performance in
1998-99,  may recapture stock market interest as  consolidation  in the industry
accelerates.  In the last year we have seen AOL combine with Time Warner, Viacom
acquire CBS, and the recently announced  Vivendi/Canal  Plus/Seagram  merger. We
think  there are many more deals,  big and small,  on the horizon as content and
distribution are linked to improve media companies' competitive positions on the
world stage. Telecommunications stocks have also taken a well-deserved rest this
year. However, the three forces driving the industry--technology,  deregulation,
and consolidation--remain firmly in place.

      We are investment realists.  Technology is the pre-eminent growth industry
in the world and over the long term discriminating tech investors should receive
generous rewards. However, the current diet of nothing but super rich technology
stocks is dangerous.  The addition of some high protein,  low calorie items from
some other investment food groups will help promote healthier long-term results.

WHAT IS RISK ARBITRAGE?

      Simply  stated,  risk  arbitrage is  investing in a merger or  acquisition
target after the deal has been  announced and  pocketing the spread  between the
trading  price of the target  company  following the  announcement  and the deal
price  upon  closing.  This  spread is  usually  relatively  narrow,  offering a
somewhat  modest nominal total return.  However,  since deals generally close in
much less than a year's time,  this modest total return  translates  into a much
more attractive annualized return.

                                        4

<PAGE>

MERGERS AND ACQUISITIONS

      The value of announced  mergers and acquisitions in the first half of 2000
increased to $894  billion  from $853 billion in the first half of 1999.  Merger
activity   continues  to  surge  as  companies  in  industries  such  as  banks,
broadcasters,  brokers,  telecommunications,  utilities, defense and health care
combine in response to falling regulatory barriers and increased competition.

      A number of themes  continued  to  surface  in the first half of the year.
Cross border mergers, minority buyouts,  strategic acquisitions and hostile bids
all  highlighted a vibrant  arbitrage  environment.  Arbitrage  activity  should
remain  dynamic during the coming months as strategic  mergers and  acquisitions
continue to be announced in a variety of  industries.  We plan to  capitalize on
those opportunities that fit our investment philosophy.

INVESTMENT SCOREBOARD

      Once again,  risk arbitrage  investments in announced deals provided solid
performance  for the  Fund.  Our  utility  investments  contributed  respectable
returns and helped  stabilize  the  portfolio  in the midst of a volatile  stock
market,  while  our  U.S.  Treasury  security  holdings,  approximately  15%  of
portfolio assets at the close of the quarter, added slow but steady returns.

      Our losers list was dominated by cyclical companies such as Federal Mogul,
WHX, and Carlyle Industries. Our limited telecommunications  holdings, including
Shenandoah Telecommunications and Telegroup, also performed poorly.

LET'S TALK STOCKS

      The  following  are stock  specifics  on  selected  holdings  of our Fund.
Favorable  earnings  prospects do not  necessarily  translate  into higher stock
prices,  but they do express a positive trend which we believe will develop over
time.

BESTFOODS  INC.  (BFO - $69.25 - NYSE)  agreed to a sweetened  buyout offer from
Unilever  (UN -  $42.98  - NYSE) of $73 per  share  in  cash,  or $24.3  billion
including assumed debt. The merger will create the world's largest food company.
The transaction is conditioned on the approvals of BFO and UN  shareholders  and
regulatory  approvals,  including the European Union and United States antitrust
clearance. The deal is not contingent upon financing. It is expected to close in
the fourth  quarter of 2000.  In May,  BFO rejected a $66 per share bid from the
Dutch food giant. Subsequently,  BFO opened merger talks with Campbell Soup Co.,
Diageo  plc,  and H. J.  Heinz,  putting  pressure  on UN to raise its bid.  The
acquisition adds such well-known  brands to UN's portfolio as Entenmann's  baked
goods and Hellmann's mayonnaise.  It will be accretive to UN's cash earnings per
share in the first full year of  operation,  resulting  in cost savings of about
$750 million  annually.  The  hostile-turned-friendly  deal is Unilever's  third
notable food acquisition in past months,  as it recently  acquired SlimFast diet
foods and Ben & Jerry's ice cream.

CENTRAL  NEWSPAPERS  INC.  (ECP - $63.25 - NYSE) has  agreed to be  acquired  by
Gannett Co. (GCI - $58.98 - NYSE), publisher of USA Today, for $2.75 billion. It
is the second largest newspaper deal in U.S. history.  GCI will pay $2.6 billion
in cash and assume $150 million in debt. Shareholders of each Class A share will
receive $64 and  shareholders of the Class B shares will receive $6.40.  GCI has
already commenced a

                                        5

<PAGE>

tender offer that should expire in August.  The Eugene C. Pulliam  Trust,  which
owns  approximately  78% of the voting power of ECP, has agreed to tender all of
its stock to GCI in the offer.  The trust's  affirmative  vote is  sufficient to
approve  the  merger.  The deal is subject to  regulatory  approval in the U.S.,
however  not that of the FCC.  The terms  value  ECP at about  11.2  times  2000
expected  EBITDA   (Earnings  Before   Interest,   Taxation,   Depreciation  and
Amortization)  and  9.5  times  2001  expected  EBITDA,  after  synergies.   The
transaction  should be accretive to Gannett's cash EPS for 2000 and in its first
full year in 2001.

LG&E  ENERGY  CORP.  (LGE -  $23.875 - NYSE)  will be  purchased  by the  U.K.'s
third-largest  power  generator,  PowerGen  plc  (PWG.LN - $8.56 - London  Stock
Exchange),  for about $5.4 billion in cash and assumed debt.  Under the terms of
the  transaction,  PWG will pay LGE  shareholders  $24.85 per share in cash. The
acquisition is subject to many  approvals,  including the  shareholders  of each
company,  the U.S.  Securities  and  Exchange  Commission,  the  Federal  Energy
Regulatory Commission,  the Kentucky Public Service Commission, and the Virginia
State  Corporation  Commission.  The combined company will have assets of nearly
$12 billion and total revenues of $8.7 billion.  The deal continues the trend of
U.K.  utilities  buying  their U.S.  counterparts  as the U.S.  market opens for
competition. It also ends PWG's two-year search for a U.S. partner, after it had
held talks with Cinergy, Florida Progress, and Houston Industries.

MCWHORTER  TECHNOLOGIES  INC.  (MWT -  $19.5625  - NYSE),  a maker of  specialty
chemicals, completed a merger with Eastman Chemical Co. (EMN - $47.75 - NYSE) on
July 10 in which EMN  bought MWT for $355  million  in cash and debt.  MWT makes
specialty  colorants and resins used in paints and  fiberglass.  EMN paid $19.70
per MWT share in a cash tender  offer,  a 42% premium to MWT's  closing price on
the day before the deal was announced.  The tender was conditioned  upon receipt
of a  minimum  of  50.1% of  shares  being  tendered  and  customary  regulatory
approvals.  EMN has  said  that  the  deal  will be  accretive  on a cash  basis
immediately and should turn accretive on an earnings basis during 2001.

PRIMARK CORP. (PMK - $37.25 - NYSE), a provider of financial data,  agreed to be
purchased by Canadian publishing giant The Thompson Corporation (TOC.TO - $34.21
- Toronto  Stock  Exchange)  for $842  million  in cash.  TOC will  also  assume
approximately  $235  million  in PMK  debt.  Under  the  merger  agreement,  PMK
shareholders  will receive $38 per share in cash, a 31% premium to PMK's closing
price on the day before the merger  announcement.  The approval  process  should
take a few  months,  with the merger  closing in the  second  half of 2000.  The
agreement  is  subject  to 51% or  more of PMK  shares  being  tendered  and the
expiration  of  certain  regulatory  approvals.  The  acquisition  will give TOC
control  of  the  two  leading   compilers  of   financial   forecasts  as  IBES
International  is added to its existing First  Call/Thomson  Financial unit. The
purchase will also increase TOC's  European  revenue from $130 million to almost
$400 million and overall revenue to $2 billion. PMK's international presence was
one of the driving factors behind TOC's interest in the deal.

RELIASTAR  FINANCIAL CORP. (RLR - $52.4375 - NYSE),  the eighth largest publicly
held life  insurance  company in the U.S.,  agreed to be  purchased by Dutch ING
Group NV  (INTNC.NA - $67.63 - Amsterdam  Stock  Exchange)  for $6.1  billion in
cash. ING will pay $54 for each share of RLR and assume approximately $1 billion
in debt. The offer price is a 75% premium to the price at which RLR traded prior
to the announcement of a deal. The transaction  will be financed  internally and
be immediately accretive to net profit per share for ING. The deal is subject to
approval from regulatory authorities in the U.S. and other jurisdictions and the
shareholders  of RLR.  The  transaction  will  take  place in the form of a cash
merger and should be completed in September.  Post merger,  ING's overall market
position in the U.S.  will go from  nineteenth  to eighth in terms of total life
and annuity  premiums.  Assets  under  management  will  almost  double from $39
billion to $75 billion.

                                        6

<PAGE>

SHARED  MEDICAL  SYSTEMS  CORP.  (SMS -  $72.9375 - NYSE) was sold to Siemens AG
(SIE.GR  -  $150.45  -  Frankfurt  Stock  Exchange),  a German  manufacturer  of
industrial and consumer products,  for $2.1 billion in cash on July 5. SMS is an
application  service provider for the health care industry.  SIE launched a cash
tender offer at $73 per share. The deal received the approval of U.S.  antitrust
authorities  and  receipt of  approval  from the German  antitrust  authorities.
Because  there is a slight  product  overlap in  Germany,  the  German  approval
delayed the close of the tender to early July. The overlap,  however,  is only a
small portion of the firms'  revenues.  The acquisition is an effort on the part
of SIE to bolster  its  presence  in the health  care IT market.  That market is
expected  to grow ten percent  annually  going  forward.  In early  March,  SMS'
competitor  Eclipsys  Corp.  launched a hostile  offer of $67 per share for SMS.
That bid was  dropped in late  March when  Eclipsys  agreed to be  purchased  by
Neoforma.com Inc.

UNITED WATER  RESOURCES  INC. (UWR - $33.50 - NYSE) will sell the  two-thirds of
the  company  that Suez  Lyonnaise  des Eaux SA  (LY.FP - $175.29 - Paris  Stock
Exchange)  does not already own to LY for $1.8 billion in cash and assumed debt.
LY  offered  $35 per  share in cash and will  assume  $800  million  in debt and
preferred  stock of UWR, the No. 2 U.S.  water  company.  In 1999,  LY purchased
Nalco  Chemical,  the largest  U.S.  maker of  water-treatment  chemicals.  LY's
acquisitions  in the U.S.  water market are part of its effort to keep pace with
its French rival Vivendi,  which purchased U.S. Filter,  a U.S.  water-treatment
company,  in April 1999. UWR provides water and sewer treatment  services to 7.5
million  people in 19 states.  It had sales of $356.2  million  last year.  Upon
completion of the UWR  acquisition,  LY will have worldwide water and wastewater
revenues of more than $7.4 billion.

VASTAR  RESOURCES  INC.  (VRI -  $82.125 - NYSE),  an  82%-owned  subsidiary  of
Atlantic  Richfield,  has received an offer from BP Amoco (BPA - $56.625 - NYSE)
for $71 per share. BPA purchased Atlantic Richfield on April 18 for $34 billion,
and wants to buy the  minority  shares  of VRI.  VRI is an oil and  natural  gas
exploration and production  company.  VRI has said that it will refer the matter
to a special committee of independent directors and will provide further comment
in due  course.  VRI is  trading  above the  offer  price  from BPA,  reflecting
investor  sentiment  that BPA will have to increase its offer in order to finish
the deal and buy the shares.

VERIO INC. (VRIO - $55.4844 - NASDAQ),  a provider of Internet services to small
and  mid-sized  businesses,  agreed to a buyout  from its  largest  shareholder,
Nippon  Telegraph & Telephone  (9432.JP -  $13,273.00  - Tokyo Stock  Exchange),
worth $5.5  billion.  NTT will pay $60 per share in cash,  a 67%  premium to the
price at which VRIO closed on the day prior to the  announcement of the deal. In
order to complete the merger,  the firms need antitrust  approval under the Hart
Scott Rodino Act, and U.S. government approval under the Exxon-Florio Act. It is
possible that the timeframe for the second approval could be extended as certain
politicians  in Congress have lobbied to require NTT to lower its local Japanese
interconnection fees in return for approval of the deal. NTT, which already owns
11.4% of VRIO, is buying the Web hosting  service-company to broaden its control
over Internet services provided by the company.  VRIO is the world's largest Web
hosting firm, as ranked by number of domain names.

                                        7

<PAGE>

MINIMUM INITIAL INVESTMENT - $1,000

      The Fund's  minimum  initial  investment  for regular  accounts is $1,000.
There are no subsequent  investment minimums. No initial minimum is required for
those  establishing an Automatic  Investment  Plan.  Additionally,  the Fund and
other  Gabelli Funds are available  through the  no-transaction  fee programs at
many major brokerage firms.

WWW.GABELLI.COM

      Please visit us on the  Internet.  Our homepage 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 send us e-mail at [email protected].

IN CONCLUSION

      In the second quarter of 2000, extreme market volatility,  particularly in
the technology  sector,  reinforced the benefits of our  conservatively  managed
portfolio  for  "safety  first"  investors.  We strive to  continue  to  produce
respectable  returns  even  in  troubled  markets,  satisfying  our  mandate  to
shareholders.

      The Fund's daily net asset value is available in the  financial  press and
each   evening   after  6:00  PM   (Eastern   Time)  by  calling   1-800-GABELLI
(1-800-422-3554).  The Fund's NASDAQ symbol is GABCX.  Please call us during the
business day for further information.

                                                     Sincerely,

                                                     /S/ SIGNATURE OMITTED

                                                     MARIO J. GABELLI, CFA
                                                     Portfolio Manager and
                                                     Chief Investment Officer

August 14, 2000

------------------------------------------------------------------
                      TOP TEN HOLDINGS
                        JUNE 30, 2000
                        -------------

Shared Medical Systems Corp.            Bestfoods Inc
Vastar Resources Inc.                   ReliaStar Financial Corp.
United Water Resources Inc.             Central Newspapers Inc.
McWhorter Technologies Inc.             Primark Corp.
Verio Inc.                              LG&E Energy Corp.
------------------------------------------------------------------

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

                                        8

<PAGE>

THE GABELLI ABC FUND
PORTFOLIO OF INVESTMENTS -- JUNE 30, 2000 (UNAUDITED)
--------------------------------------------------------------------------------
                                                                       MARKET
   SHARES                                            COST              VALUE
   ------                                            ----              ------
              COMMON STOCKS -- 87.4%
              AUTOMOTIVE: PARTS AND ACCESSORIES -- 0.2%
     13,000   Federal-Mogul Corp. ...........    $   275,087        $   124,312
                                                 -----------        -----------
              AVIATION: PARTS AND SERVICES -- 0.6%
     25,000   Aviall Inc.+ ..................        371,793            123,437
     10,000   Fairchild Corp., Cl. A+ .......        131,565             48,750
      7,000   Hi-Shear Industries Inc. ......         10,215             17,937
     22,000   Kaman Corp., Cl. A ............        395,473            235,125
                                                 -----------        -----------
                                                     909,046            425,249
                                                 -----------        -----------
              BROADCASTING -- 0.3%
      4,000   Liberty Corp. .................        175,808            168,000
      2,000   Salem Communications
               Corp., Cl. A+ ................         27,602             18,562
                                                 -----------        -----------
                                                     203,410            186,562
                                                 -----------        -----------
              BUSINESS SERVICES -- 10.2%
     25,000   Cendant Corp.+ ................        504,579            350,000
      2,580   Fisher Scientific
               International Inc.+ ..........         24,892             63,855
     20,000   National Processing Inc.+ .....        174,891            250,000
     50,000   Primark Corp. .................      1,871,250          1,862,500
      2,580   ProcureNet Inc.+ ..............              0                387
     80,000   Verio Inc.+ ...................      4,677,989          4,438,750
                                                 -----------        -----------
                                                   7,253,601          6,965,492
                                                 -----------        -----------
              COMMUNICATIONS EQUIPMENT -- 0.1%
      5,000   Dynatech Corp.+ ...............         82,322             90,625
                                                 -----------        -----------
              COMPUTER SOFTWARE AND SERVICES -- 0.1%
      1,000   Global Sources Ltd.+ ..........         32,625             25,375
      1,000   Policy Management
               Systems Corp.+ ...............         10,675             15,375
                                                 -----------        -----------
                                                      43,300             40,750
                                                 -----------        -----------
              CONSUMER PRODUCTS -- 0.3%
     28,942   Syratech Corp.+ ...............        911,975            227,918
                                                 -----------        -----------
              DIVERSIFIED INDUSTRIAL -- 0.3%
      6,000   Ampco-Pittsburgh Corp. ........         69,606             66,750
     11,000   Katy Industries Inc. ..........        250,300            129,250
      4,000   WHX Corp.+ ....................         41,825             22,000
                                                 -----------        -----------
                                                     361,731            218,000
                                                 -----------        -----------
              ENERGY AND UTILITIES: ELECTRIC -- 1.6%
     45,000   El Paso Electric Co.+ .........        370,225            503,437
     10,000   Florida Progress Corp. ........        469,801            468,750
      5,000   St. Joseph Light & Power Co. ..        102,750            105,000
                                                 -----------        -----------
                                                     942,776          1,077,187
                                                 -----------        -----------
              ENERGY AND UTILITIES: INTEGRATED -- 3.4%
     75,000   LG&E Energy Corp. .............      1,737,187          1,790,625
     25,000   MCN Energy Group Inc. .........        599,532            534,375
                                                 -----------        -----------
                                                   2,336,719          2,325,000
                                                 -----------        -----------

                                                                       MARKET
   SHARES                                            COST              VALUE
   ------                                            ----              ------
              ENERGY AND UTILITIES: NATURAL GAS -- 17.3%
     22,000   AGL Resources Inc. ............    $   399,054        $   350,625
      3,500   Berkshire Energy Resources ....        122,679            130,812
     20,000   Columbia Energy Group .........      1,199,125          1,312,500
     12,000   Eastern Enterprises ...........        686,100            756,000
     12,000   EnergyNorth Inc. ..............        684,300            711,000
      7,000   Piedmont Natural
               Gas Co. Inc. .................        203,773            185,938
     42,000   Southwest Gas Corp. ...........      1,018,325            735,000
      7,000   Valley Resources Inc. .........        156,213            168,875
     90,000   Vastar Resources Inc. .........      7,319,936          7,391,250
                                                 -----------        -----------
                                                  11,789,505         11,742,000
                                                 -----------        -----------
              ENERGY AND UTILITIES: WATER -- 10.6%
     18,000   E'Town Corp. ..................      1,131,500          1,195,875
      6,500   SJW Corp. .....................        763,887            772,688
    150,000   United Water Resources Inc. ...      4,986,497          5,231,250
                                                 -----------        -----------
                                                   6,881,884          7,199,813
                                                 -----------        -----------
              ENTERTAINMENT -- 0.6%
      5,000   Fisher Companies Inc. .........        351,853            382,500
                                                 -----------        -----------
              EQUIPMENT AND SUPPLIES -- 0.3%
      9,174   Juno Lighting Inc. ............        142,359             55,044
     10,000   UCAR International Inc.+ ......        165,824            130,625
                                                 -----------        -----------
                                                     308,183            185,669
                                                 -----------        -----------
              FINANCIAL SERVICES -- 4.9%
      1,500   Allstate Corp. ................         39,638             33,375
     32,500   Argonaut Group Inc. ...........      1,074,671            556,563
      5,000   Leucadia National Corp. .......        174,181            114,063
        562   Markel Corp.+ .................         73,060             79,593
     10,000   Pioneer Group Inc.+ ...........        317,785            423,750
     40,000   ReliaStar Financial Corp. .....      2,052,625          2,097,500
                                                 -----------        -----------
                                                   3,731,960          3,304,844
                                                 -----------        -----------
              FOOD AND BEVERAGE -- 7.6%
     35,000   Advantica Restaurant
               Group Inc.+ ..................        326,901             33,906
     55,000   Bestfoods Inc. ................      3,817,629          3,808,750
     20,000   Nabisco Holdings Corp., Cl. A .      1,055,375          1,050,000
     20,000   Whitman Corp. .................        258,078            247,500
                                                 -----------        -----------
                                                   5,457,983          5,140,156
                                                 -----------        -----------
              HEALTH CARE -- 11.7%
      4,500   Life Technologies Inc. ........        167,906            229,500
    105,800   Shared Medical
               Systems Corp. ................      7,566,322          7,716,788
                                                 -----------        -----------
                                                   7,734,228          7,946,288
                                                 -----------        -----------
              HOME FURNISHINGS -- 0.2%
    320,000   Carlyle Industries Inc.+ ......        150,016            165,000
      8,000   O'Sullivan Industries
               Holdings Inc.+ ...............          4,750              4,000
                                                 -----------        -----------
                                                     154,766            169,000
                                                 -----------        -----------


                 See accompanying notes to financial statements.

                                        9

<PAGE>

THE GABELLI ABC FUND
PORTFOLIO OF INVESTMENTS (CONTINUED) -- JUNE 30, 2000 (UNAUDITED)
--------------------------------------------------------------------------------
                                                                       MARKET
   SHARES                                            COST              VALUE
   ------                                            ----              ------
              HOTELS AND GAMING -- 0.0%
      2,500   Boca Resorts Inc., Cl. A+ .....    $    18,875        $    24,688
                                                 -----------        -----------
              METALS AND MINING -- 0.0%
     10,000   Royal Oak Mines Inc.+ .........         11,858                 50
                                                 -----------        -----------
              PUBLISHING -- 2.8%
     30,000   Central Newspapers Inc., Cl. A       1,900,875          1,897,500
                                                 -----------        -----------
              REAL ESTATE -- 3.7%
     65,000   Castle & Cooke Inc.+ ..........      1,206,969          1,255,313
     70,000   Catellus Development Corp.+ ...      1,175,673          1,050,000
     20,000   Griffin Land & Nurseries Inc.+         322,381            246,250
      3,169   HomeFed Corp.+ ................            567              2,218
                                                 -----------        -----------
                                                   2,705,590          2,553,781
                                                 -----------        -----------
              RETAIL -- 1.8%
    120,000   Bruno's Inc.+ .................         76,300                  0
     16,000   Hannaford Bros. Co. ...........      1,154,842          1,150,000
      8,000   Lillian Vernon Corp. ..........        132,815             84,000
                                                 -----------        -----------
                                                   1,363,957          1,234,000
                                                 -----------        -----------
              SPECIALTY CHEMICALS -- 7.9%
     20,000   Lilly Industries Inc., Cl. A ..        606,312            601,250
    246,500   McWhorter Technologies Inc.+ ..      4,828,170          4,791,344
                                                 -----------        -----------
                                                   5,434,482          5,392,594
                                                 -----------        -----------
              TELECOMMUNICATIONS -- 0.8%
     15,000   Citizens Communications Co. ...        152,183            258,750
      9,500   Shenandoah
               Telecommunications Co. .......        214,381            294,500
      3,000   Telegroup Inc.+ ...............             32                 30
                                                 -----------        -----------
                                                     366,596            553,280
                                                 -----------        -----------
              WIRELESS COMMUNICATIONS -- 0.1%
      1,000   American Tower Corp., Cl. A+ ..         15,415             41,688
                                                 -----------        -----------
              TOTAL COMMON STOCKS                 61,547,977         59,448,946
                                                 -----------        -----------

              PREFERRED STOCKS -- 0.8%
              DIVERSIFIED INDUSTRIAL -- 0.5%
     11,500   WHX Corp.,
               6.50% Cv. Pfd., Ser. A .......        535,712            248,688
      6,500   WHX Corp.,
               $3.75 Cv. Pfd., Ser. B .......        273,676            112,125
                                                 -----------        -----------
                                                     809,388            360,813
                                                 -----------        -----------
              TELECOMMUNICATIONS -- 0.3%
      3,000   Citizens Communications Co.,
               5.00% Cv. Pfd. ...............        147,020            202,125
                                                 -----------        -----------
              TOTAL PREFERRED STOCKS                 956,408            562,938
                                                 -----------        -----------


                                                                       MARKET
   SHARES                                            COST              VALUE
   ------                                            ----              ------
              CORPORATE BONDS -- 0.3%
              ENVIRONMENTAL SERVICES -- 0.0%
  $  34,000   Waste Management Inc., Sub. Deb. Cv.
               4.00%, 02/01/02 ..............    $    31,171        $    31,535
                                                 -----------        -----------
              HOTELS AND GAMING -- 0.1%
    100,000   Hilton Hotels Corp., Sub. Deb. Cv.
               5.00%, 05/15/06 ..............         77,018             79,000
                                                 -----------        -----------
              RETAIL -- 0.0%
    200,000   RDM Sports Group Inc., Cv.
               8.00%, 08/15/03 ..............         49,839             20,500
                                                 -----------        -----------
              TRANSPORTATION -- 0.2%
    850,000   Builders Transport Inc., Cv.
               6.50%, 05/01/11 ..............         76,540                  0
    140,000   WorldCorp. Inc.,
               Sub. Deb. Cv.
               Zero Coupon, 05/15/04 ........         30,699             84,000
                                                 -----------        -----------
                                                     107,239             84,000
                                                 -----------        -----------
              TOTAL CORPORATE BONDS                  265,267            215,035
                                                 -----------        -----------
   SHARES
  --------
              RIGHTS -- 0.0%
              FINANCIAL SERVICES -- 0.0%
        562   Markel Corp. Rights+ ..........          5,023              4,092
                                                 -----------        -----------
 PRINCIPAL
  AMOUNT
-----------
              U.S. GOVERNMENT OBLIGATIONS -- 15.4%
$10,582,000   U.S. Treasury Bills,
               5.44% to 5.82%++,
               due 07/06/00 to 09/14/00 .....     10,464,367         10,467,079
                                                 -----------        -----------
              TOTAL
               INVESTMENTS -- 103.9% ........    $73,239,042         70,698,090
                                                 ===========        ===========
              OTHER ASSETS AND
               LIABILITIES (NET) -- (3.9%) .................         (2,660,697)
                                                                    -----------
              NET ASSETS -- 100.0%
               (6,876,101 shares outstanding) ..............        $68,037,393
                                                                    ===========
------------------------
              For Federal tax purposes:
              Aggregate cost ...............................        $73,239,042
                                                                    ===========
              Gross unrealized appreciation ................         $1,741,392
              Gross unrealized depreciation ................         (4,282,344)
                                                                    -----------
              Net unrealized depreciation ..................        $(2,540,952)
                                                                    -----------
------------------------
    +   Non-income producing security.
    ++  Represents annualized yield at date of purchase.

                 See accompanying notes to financial statements.

                                        10

<PAGE>

                              THE GABELLI ABC FUND

STATEMENT OF ASSETS AND LIABILITIES
JUNE 30, 2000 (UNAUDITED)
--------------------------------------------------------------------------------
ASSETS:
  Investments, at value (Cost $73,239,042) ....................     $70,698,090
  Cash ........................................................           4,512
  Dividends and interest receivable ...........................         107,405
  Receivable for investments sold .............................           8,105
                                                                    -----------
  TOTAL ASSETS ................................................      70,818,112
                                                                    -----------
LIABILITIES:
  Payable for investments purchased ...........................       2,587,215
  Payable for investment advisory fees ........................          55,896
  Payable for distribution fees ...............................          13,974
  Other accrued expenses ......................................         123,634
                                                                    -----------
  TOTAL LIABILITIES ...........................................       2,780,719
                                                                    -----------
  NET ASSETS applicable to 6,876,101
    shares outstanding ........................................     $68,037,393
                                                                    ===========
NET ASSETS CONSIST OF:
  Capital stock, at par value .................................     $     6,876
  Additional paid-in capital ..................................      65,783,130
  Accumulated net investment income ...........................         390,239
  Accumulated net realized gain on investments ................       4,398,100
  Net unrealized depreciation on investments ..................      (2,540,952)
                                                                    -----------
  TOTAL NET ASSETS ............................................     $68,037,393
                                                                    ===========
  NET ASSET VALUE, offering and redemption
    price per share ($68,037,393 / 6,876,101
    shares outstanding; 1,000,000,000 shares
    authorized of $0.001 par value) ...........................           $9.89
                                                                          =====

STATEMENT OF OPERATIONS
FOR THE SIX MONTHS ENDED JUNE 30, 2000 (UNAUDITED)
--------------------------------------------------------------------------------
INVESTMENT INCOME:
  Dividends ...................................................      $  383,124
  Interest ....................................................         569,654
                                                                     ----------
  TOTAL INVESTMENT INCOME .....................................         952,778
                                                                     ----------
EXPENSES:
  Investment advisory fees ....................................         330,359
  Distribution fees ...........................................          82,590
  Legal and audit fees ........................................          32,409
  Shareholder services fees ...................................          31,295
  Custodian fees ..............................................          26,252
  Registration fees ...........................................          22,368
  Shareholder communications expenses .........................          16,031
  Directors' fees .............................................           5,386
  Interest expense ............................................          12,252
  Miscellaneous expenses ......................................           3,597
                                                                     ----------
  TOTAL EXPENSES ..............................................         562,539
                                                                     ----------
  NET INVESTMENT INCOME .......................................         390,239
                                                                     ----------
NET REALIZED AND UNREALIZED GAIN
  ON INVESTMENTS:
  Net realized gain on investments
    and futures contracts .....................................       4,410,101
  Net change in unrealized depreciation
    on investments ............................................      (1,533,140)
                                                                     ----------
  NET REALIZED AND UNREALIZED GAIN
    ON INVESTMENTS ............................................       2,876,961
                                                                     ----------
  NET INCREASE IN NET ASSETS RESULTING
    FROM OPERATIONS ...........................................      $3,267,200
                                                                     ==========

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 .....................................     $    390,239         $    985,497
  Net realized gain on investments and futures contracts ....        4,410,101            5,778,370
  Net change in unrealized depreciation on investments ......       (1,533,140)            (903,185)
                                                                  ------------         ------------
  NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS ......        3,267,200            5,860,682
                                                                  ------------         ------------
DISTRIBUTIONS TO SHAREHOLDERS:
  Net investment income .....................................               --             (463,667)
  Net realized gain on investments ..........................               --           (2,734,053)
                                                                  ------------         ------------
  TOTAL DISTRIBUTIONS TO SHAREHOLDERS .......................               --           (3,197,720)
                                                                  ------------         ------------
CAPITAL SHARE TRANSACTIONS:
  Net increase in net assets from capital share transactions        21,986,706              762,387
                                                                  ------------         ------------
  NET INCREASE IN NET ASSETS ................................       25,253,906            3,425,349
NET ASSETS:
  Beginning of period .......................................       42,783,487           39,358,138
                                                                  ------------         ------------
  End of period .............................................      $68,037,393          $42,783,487
                                                                   ===========          ===========
</TABLE>


                 See accompanying notes to financial statements.

                                        11

<PAGE>

THE GABELLI ABC FUND
NOTES TO FINANCIAL STATEMENTS (UNAUDITED)
--------------------------------------------------------------------------------

1. ORGANIZATION. The Gabelli ABC Fund (the "Fund"), a series of Gabelli Investor
Funds, Inc. (the "Corporation"), was organized on October 30, 1992 as a Maryland
corporation.  The  Fund is a  non-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 to achieve total returns that are
attractive to investors in various market  conditions  without excessive risk of
capital loss. The Fund commenced investment operations on May 14, 1993.

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 Directors. Short term debt securities with remaining maturities of 60 days or
less are valued at amortized cost, unless the Directors  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  Directors.  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. Options
are valued at the last sale price on the  exchange on which they are listed.  If
no sales of such options  have taken place that day,  they will be valued at the
mean between their closing bid and asked prices.

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 Directors.  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

                                        12

<PAGE>

THE GABELLI ABC 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  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.

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 1.00% of the value of the Fund's 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 Directors of the Fund who are its affiliates.

4.  DISTRIBUTION  PLAN. The Fund's Board of Directors has 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 $82,590,  or 0.25% of average
daily net  assets,  the annual  limitation  under the Plan.  Such  payments  are
accrued daily and paid monthly.

                                        13

<PAGE>

THE GABELLI ABC FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED) (UNAUDITED)
--------------------------------------------------------------------------------

5.  PORTFOLIO  SECURITIES.  Purchases and sales of securities for the six months
ended June 30, 2000, other than short term securities,  aggregated  $173,508,172
and $146,291,375, respectively.

6. TRANSACTIONS WITH AFFILIATES.  During the six months ended June 30, 2000, the
Fund paid brokerage  commissions of $200,454 to Gabelli & Company,  Inc. and its
affiliates.

7. LINE OF  CREDIT.  The Fund has  access to an  unsecured  line of credit up to
$25,000,000  from the  custodian for temporary  borrowing  purposes.  Borrowings
under this  arrangement  bear  interest at 0.75% above the Federal Funds rate on
outstanding balances. There were no borrowings outstanding at June 30, 2000.

The average daily amount of borrowings  outstanding  within the six months ended
June 30, 2000 was $145,757,  with a related weighted interest rate of 6.77%. The
maximum  amount  borrowed at any time during the six months  ended June 30, 2000
was $5,972,000.

8. CAPITAL STOCK  TRANSACTIONS.  Transactions in shares of capital stock 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 ......................................    6,481,685      $ 61,679,967       8,133,675      $ 79,459,417
Shares issued upon reinvestment of dividends .....           --                --         331,243         3,087,197
Shares redeemed ..................................   (4,138,377)      (39,693,261)     (8,037,283)      (81,784,227)
                                                     -----------     ------------      ----------      ------------
    Net increase .................................    2,343,308      $ 21,986,706         427,635      $    762,387
                                                     ===========     ============      ==========      ============
</TABLE>


                                        14

<PAGE>


THE GABELLI ABC FUND
FINANCIAL HIGHLIGHTS
--------------------------------------------------------------------------------

Selected data for a share of capital stock 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 .   $    9.44       $  9.59      $ 10.23      $  9.84     $  9.71      $  9.57
                                            ---------       -------      -------      -------     -------      -------
   Net investment income ................        0.06          0.26         0.22         0.08        0.21         0.21
   Net realized and unrealized gain
     on investments .....................        0.39          0.59         0.90         1.17        0.54         0.86
                                            ---------       -------      -------      -------     -------      -------
   Total from investment operations .....        0.45          0.85         1.12         1.25        0.75         1.07
                                            ---------       -------      -------      -------     -------      -------
DISTRIBUTIONS TO SHAREHOLDERS:
   Net investment income ................          --         (0.14)       (0.22)       (0.08)      (0.21)       (0.21)
   In excess of net investment income ...          --            --        (0.00)(a)    (0.01)         --           --
   Net realized gain on investments .....          --         (0.86)       (1.54)       (0.77)      (0.41)       (0.72)
   In excess of net realized gain
     on investments .....................          --            --        (0.00)(a)       --          --           --
                                            ---------       -------      -------      -------     -------      -------
   Total distributions ..................          --         (1.00)       (1.76)       (0.86)      (0.62)       (0.93)
                                            ---------       -------      -------      -------     -------      -------
   NET ASSET VALUE, END OF PERIOD .......   $    9.89       $  9.44      $  9.59      $ 10.23     $  9.84      $  9.71
                                            =========       =======      =======      =======     =======      =======
   Total return+ ........................        4.8%          9.0%        11.1%        12.8%        7.8%        11.2%
                                            =========       =======      =======      =======     =======      =======
RATIOS TO AVERAGE NET ASSETS AND
   SUPPLEMENTAL DATA:
   Net assets, end of period (in 000's) .   $  68,037       $42,783      $39,358      $35,228     $26,801      $19,862
   Ratio of net investment income
     to average net assets ..............       1.18%(d)      1.37%        1.00%        0.87%       2.11%        1.83%
   Ratio of operating expenses
     to average net assets (b) (c) ......       1.70%(d)      1.47%        1.69%        2.26%       2.09%        2.10%
   Portfolio turnover rate ..............        291%          672%         299%         493%        343%         508%
</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) Amount represents less than $0.005 per share.
(b) The ratio of  operating  expenses  to average net assets for the years ended
    December  31,  1998 and 1997 do not  include a  reduction  of  expenses  for
    custodian fee credits.  Including  such credits,  the ratios would have been
    1.68% and 2.25%, respectively.
(c) The Fund  incurred  interest  expense  during the six months  ended June 30,
    2000.  If interest  expense had not been  incurred,  the ratio of  operating
    expenses to average net assets would have been 1.67%.
(d) Annualized.

                 See accompanying notes to financial statements.

                                        15

<PAGE>

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

                BOARD OF DIRECTORS
Mario J. Gabelli, CFA           Karl Otto Pohl
CHAIRMAN AND CHIEF              FORMER PRESIDENT
INVESTMENT OFFICER              DEUTSCHE BUNDESBANK
GABELLI ASSET MANAGEMENT INC.

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

Vincent D. Enright
FORMER SENIOR VICE PRESIDENT
AND CHIEF FINANCIAL OFFICER
KEYSPAN ENERGY CORP.

                     OFFICERS
Mario J. Gabelli, CFA         Bruce N. Alpert
PRESIDENT AND CHIEF           VICE PRESIDENT
INVESTMENT OFFICER            AND TREASURER

James E. McKee
SECRETARY

                    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 ABC Fund. It is not authorized for distribution to prospective investors
unless preceded or accompanied by an effective prospectus.
--------------------------------------------------------------------------------
GAB408Q200SR


                                             [Photo of Mario J. Gabelli omitted]

                                   THE
                                   GABELLI
                                   ABC
                                   [Graphic of ABC blocks omitted]
                                   FUND




                                                              SEMI-ANNUAL REPORT
                                                                   JUNE 30, 2000


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