GABELLI INVESTOR FUNDS INC
N-30D, 2000-03-03
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                              THE GABELLI ABC FUND

                                  ANNUAL REPORT
                                DECEMBER 31, 1999

TO OUR SHAREHOLDERS,

      The leading stock market indices rallied strongly in the fourth quarter of
1999 and  finished the year at or near record  highs.  However,  relatively  few
stocks  participated in this year's stock market bonanza.  New lows  outnumbered
new  highs on the NYSE by a wide  margin  throughout  much of the  year.  Growth
continued to  out-perform  value across the market  capitalization  spectrum and
large cap stocks continued to outperform small caps.  Technology stocks were the
biggest winners,  with the tech-heavy  Nasdaq Composite  outdistancing all other
major market indices.

      In this uneven market environment, we are extremely pleased to report that
the Fund once again achieved its risk/adjusted return objective.

INVESTMENT PERFORMANCE

      For the fourth  quarter  ended  December 31, 1999,  the Gabelli ABC Fund's
(the "Fund") total return was 2.38%. The Standard & Poor's ("S&P") 500 Index and
Lipper U.S. Treasury Money Market Average had total returns of 14.87% and 1.16%,
respectively,  over the same period. The S&P 500 Index is an unmanaged indicator
of stock  market  performance,  while the Lipper  Average  reflects  the average
performance of mutual funds classified in this particular category. The Fund was
up 9.00% for 1999.  The S&P 500 Index and  Lipper  U.S.  Treasury  Money  Market
Average rose 21.03% and 4.26%, respectively, over the same twelve-month period.

      For the five-year  period ended December 31, 1999, the Fund's total return
averaged 10.36% annually versus average annual total returns of 28.54% and 4.76%
for  the  S&P  500  Index  and  Lipper  U.S.   Treasury  Money  Market  Average,
respectively.  Since  inception on May 14, 1993 through  December 31, 1999,  the
Fund had a cumulative total return of 86.69%, which equates to an average annual
total return of 9.86%.

<PAGE>

INVESTMENT RESULTS (a)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                           Quarter
                                       ------------------------------------------
                                         1st         2nd        3rd          4th          Year
                                         ---         ---        ---          ---          ----
<S>                                    <C>         <C>        <C>          <C>          <C>
  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>

- ----------------------------------------------
Average Annual Returns - December 31, 1999 (a)
- ----------------------------------------------
  1 Year ..............  9.00%
  5 Year .............. 10.36%
  Life of Fund (b) ....  9.86%
- ----------------------------------------------

                       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

 (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.
- --------------------------------------------------------------------------------

WHAT WE DO

      The Gabelli ABC Fund, with its unique  Performance  Guaranty Program,  was
created in 1993 for conservative investors who had been reluctant to participate
in the equity  markets.  In other words,  it was a vehicle to allow investors to
"get their feet wet" in the stock market without risking loss of capital. We see
ourselves as an  "enhanced  money  market".  Our approach has been to maintain a
diversified portfolio of value-oriented equities, convertible preferred

[Graphics of Pyramid omitted--text as follows]
EPS
PMV
MANAGEMENT
CASH FLOW
RESEARCH
[End of Pyramid text]

                                      2

<PAGE>

COMPARISON OF CHANGE IN VALUE OF A $10,000 INVESTMENT IN THE GABELLI ABC FUND,
     THE LIPPER U.S. TREASURY MONEY MARKET AVERAGE and THE S&P 500 INDEX

[GRAPH OMITTED]

                                Lipper
            Gabelli ABC         U.S. Treasury
            Fund                Money Market Average     S&P 500 Index

5/14/93      $10,000            $10,000                  $10,000
12/93         10,910             10,163                   10,659
12/94         11,401             10,530                   10,798
12/95         12,278             11,091                   14,858
12/96         13,667             11,618                   18,275
12/97         15,410             12,139                   24,370
12/98         17,127             12,706                   31,374
12/99         18,668             13,247                   37,972

* PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

stocks,  convertible  bonds  and U.S.  government  securities.  Conceptually,the
upside  potential of stocks would help produce  greater  total return  potential
than a straight  bond or government  securities  fund and the risk in the equity
portion of the portfolio  would be diminished by the  combination  of lower risk
convertible  securities and virtually risk free U.S.  Treasury  bills.  To date,
this approach has worked quite well. Although we have indefinitely suspended the
Performance  Guaranty  Program,  we believe the Fund's  investment  strategy can
continue to produce favorable results.

HISTORY OF THE FUND

      The  Gabelli  ABC  Fund  was  launched  on May  14,  1993  with a  minimum
guaranteed  total return of 6% through May 14, 1994. For 1994, 1995 and 1996, 5%
Performance  Guaranty Programs were in place. These programs were unique because
they  provided  investors  the full upside  potential  of the  investment  while
guaranteeing a minimum total return.  Gabelli Funds,  Inc.'s fourth  Performance
Guaranty  Program  concluded  on  December  31,  1996.  Beginning  in 1997,  the
Performance  Guaranty  Program was suspended but the Fund's annual total returns
were 12.8%, 11.1% and 9.0% for the ensuing three years. Although the Performance
Guaranty  Program is not being offered for 2000, the Fund continues  striving to
achieve the same  objectives.  During the most recent  five-year period in which
the S&P 500  Index has  delivered  20% plus  annual  returns,  a minimum  return
guarantee  of 5% appeared  dull and  unattractive.  However,  in terms of market
volatility, the Fund has provided comfort to the risk averse.

                                     3

<PAGE>

COMMENTARY

1999'S HAVE AND HAVE NOT MARKET

      At year-end  1999,  many  investors  were left pondering how and why their
individual stock and/or mutual fund portfolios  performed so poorly in a year in
which all the leading stock market  indices  posted strong gains.  The answer is
simple.   A   relative   handful  of   increasingly   popular   technology   and
Internet-related  stocks  propelled the  capitalization  weighted market indices
higher,  while the  majority of stocks  languished.  If you owned these types of
companies,  you were a winner. If you owned index funds, you earned  respectable
returns. If you owned most anything else, especially value stocks and most value
oriented funds, you had a "dull year".

      In this "have and have not" market, our risk averse allocation among value
oriented  common  stocks,   arbitrage  investments,   and  short  term  Treasury
securities helped preserve and enhance shareholder assets.

THE ECONOMY AND THE MARKET

      The long term bull market in U.S. stocks has been fueled by low inflation,
declining  interest rates,  strong corporate  profit growth,  and very favorable
supply/demand  dynamics for equities.  As we write,  two of the four ingredients
that have been  propelling  the market  remain in place.  Corporate  profits are
expanding at an  attractive  rate and demand for  equities  continues to outpace
supply.  However,  inflation has moved modestly higher and market interest rates
are at two-year peaks.

      Will inflation remain in the current comfort zone? That depends on whether
the Federal Reserve can effectively  restrain the economy and whether  increased
productivity  can continue to offset  rising wages in a tight labor  market.  At
present,  nobody (including us) can answer these questions.  However, we suspect
that if the economy  continues to expand at a rate in excess of 5.0% and the job
market   continues  to  tighten,   there  will  be  more  serious   inflationary
implications and interest rates will move even higher. If this economic scenario
unfolds,  stocks will likely stall or perhaps  correct.  If the Federal  Reserve
succeeds in cooling down the economy and inflation and interest rates  stabilize
around  current  levels,  stocks could advance in line with  corporate  earnings
growth.

      We believe  that the ABC Fund  portfolio  selections  should  continue  to
adequately  reward risk averse investors in either of these two  economic/market
scenarios.  We are now  enjoying  materially  higher  yields from our short term
Treasury securities (cash reserves).  Our arbitrage  investments  continue to be
productive on an annualized  return basis,  while  shielding the portfolio  from
stock market volatility.  We believe our common stock portfolio still represents
good fundamental value.

THIS YEAR'S SCORECARD

      Our top  performers  in 1999 come  from an  eclectic  group of  industries
including wireless  communications  (CommNet Cellular),  utilities (United Water
Resources), chemicals (Amphenol Corp.)

                                       4

<PAGE>

and  telecommunications  (Citizens  Utilities).  Notable losers include aviation
suppliers  Aviall and Kaman,  insurer  Argonaut Group,  auto parts  manufacturer
Federal-Mogul,  and gold miner Royal Oak Mines.  We were  pleased with our stock
picking batting  average in a year in which the market  rewarded  relatively few
companies and ignored or abandoned most others.

      Since arbitrage plays a major role in our portfolio  strategy,  we want to
share  excerpts  from an  article  we  prepared  for CIGAR  AFICIONADO  magazine
discussing  what  we  believe  is  now  a  very  exciting   investment  subject.
Additionally,  more  examples and  strategies  for  arbitrage  as an  investment
opportunity are provided in Gabelli University Press' new book DEALS... DEALS...
AND MORE DEALS.


RISK ARBITRAGE--HOW TO PROFIT FROM "THE THIRD WAVE OF TAKEOVERS"(TM)
                                                                 [PHOTO OMITTED]
WE ARE IN THE MIDST OF THE THIRD  GREAT WAVE OF MERGERS AND  ACQUISITIONS  SINCE
WORLD WAR II.

       The first wave swelled in the 1960s, with conglomerators like LTV's Jimmy
Ling,  Gulf &  Western's  Charles  Bluhdorn,  and ITT's  Harold  Geneen  merging
companies in non-related  industries.  They did so in an attempt to produce more
consistent  earnings growth through the ups and downs of the business cycle. The
second  major wave of takeovers  began in the 1980s,  when  financial  engineers
including leveraged buyout firms like Kohlberg,  Kravis & Roberts, and corporate
raiders like T. Boone Pickens used junk debt to gobble up undervalued  companies
and then  dismember  them for a profit.  This second  wave broke as  financially
unrealistic deals like the proposed  leveraged buyout ("LBO") of United Airlines
fell  apart,  the  junk  bond  market   collapsed,   and  the  House  of  Drexel
disintegrated under the weight of a government criminal investigation.

      The third  great  wave of  mergers  and  acquisitions  is being  driven by
consolidators--companies  in a wide range of industries  buying  competitors  in
order to extend  their  franchises,  trim costs and increase  profitability.  We
trace the  beginning of this wave to March 14, 1994,  when much admired  General
Electric  Chairman Jack Welch  launched a hostile bid to buy Kemper  Insurance -
signaling that deals were once again respectable.  This Third Wave will continue
to gain momentum as companies  worldwide  jockey for market position and profits
in the increasingly competitive global economy.

THERE  ARE TWO WAYS  INVESTORS  CAN TAKE  ADVANTAGE  OF MERGER  AND  ACQUISITION
ACTIVITY.

      The first is buying public shares of likely takeover candidates before the
"deal" is announced.  Gabelli Asset Management's  ability to identify industries
ripe for consolidation and our focus on undervalued  companies has resulted in a
long list of portfolio holdings being taken over at substantial  premiums to our
purchase  prices.  The  second  (and much less  known)  method is  through  risk
arbitrage.  It  would  take a book  to  detail  all  the  complexities  of  risk
arbitrage.  In this article, I'll provide the basics, and more importantly,  the
reasons why I believe risk arbitrage is such a compelling investment strategy.

      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

                                       5

<PAGE>

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.

      The  following  is a very basic risk  arbitrage  investment.  On March 22,
1999, the NYSE-listed First Data Corp. announced it would pay $25.50 in cash for
all the  remaining  publicly  owned  shares of  Paymentech,  Inc.  (52.5% of the
company would continue to be owned by Bank One, which has a merchant  processing
alliance  with First  Data).  The deal was expected to close within four months.
Following  the  announcement,  we were able to  purchase  Paymentech  shares for
$24.02  (the  trading  price of $24 per share on the day the deal was  announced
plus 2 cents per share in  commissions).  The spread  between our purchase price
and the value of the stock upon  closing  was 6.2%.  The deal closed on July 27,
1999, generating an annualized return of 18.5%.

      This particular arbitrage worked out very well for us. We were able to buy
Paymentech shares at a good discount to the final transaction price and the deal
closed  on  schedule.  Not  all  arb  investments  produce  such  an  attractive
annualized return. However,  arbitrage portfolios have posted annualized returns
in the low to mid teens in the 1990s.

THE GREAT  ADVANTAGE OF RISK  ARBITRAGE  IS THAT IT IS LARGELY A MARKET  NEUTRAL
STRATEGY--DEALS  GET DONE IN GOOD MARKETS AND BAD--THAT  CAN DELIVER  CONSISTENT
RETURNS EVEN IN VOLATILE MARKETS.

      Because  a  conservatively   managed  risk  arbitrage  portfolio  produces
consistent  gains,  the financial  magic of  compounding  works  strongly in its
favor. Let me offer two examples of the power of compounding returns.

      Once upon a time,  there was a king in a far away land.  In order to repay
the local sage for saving his  daughter's  life,  the king  offered the sage any
reward he wished.  The sage asked for what appeared to be a modest  stipend--one
grain of rice - the  amount to be doubled  each day for 31 days.  The sage would
receive one grain of rice that day, two the next,  four the next, and so on. The
king thought nothing of giving away a few grains of rice on a daily basis,  but,
it was only a matter of weeks  before  the king's  granaries  were empty and the
sage had become the richest man in the land.  After only one month, the king was
paying  the sage over 1  billion  grains  of rice a day.  In 31 days,  one grain
became one billion through the magic of compounding.

      The  purchase of  Manhattan  Island from the Indians for just $24 worth of
beads is generally  considered one of the greatest  investments in history.  The
estimated value of all the real estate in Manhattan today is around $10 trillion
dollars. Amazingly, this equates to an annualized compounded return of just 7.4%
in the 375 years since the deal was done.

      Of course,  arbitrage  investments  don't compound at 100% daily, and most
investors' time horizons are much shorter than the 375 years it took to make the
purchase of Manhattan  look like such a great deal.  But consider the  following
hypothetical scenario. Alice and Bob both invest $1 million of their

                                        6

<PAGE>

401(k) money in the year 2000. Alice puts her money in a risk arbitragefund that
ends up returning 12% each year for the next ten years. Bob puts his money in an
aggressive equity fund that gains 20% in eight of the ten years, but is down 20%
in year one and year six. In 2010, Alice has $3.1 million compared to Bob's $2.7
million,  despite the fact that Bob's returns were almost double Alice's returns
in eight of the ten years.

      Are we shortchanging Bob in this scenario? After all, the stock market has
had only one down year in the last 10,  and over that time  period,  the S&P 500
has posted an average  annual gain of 20%. True enough.  However,  the long term
average  annualized return from stocks is just over 11%, and I suggest that over
the next ten years,  equity  returns  will more  closely  resemble  the historic
norms. I would also opine that these returns will be accompanied by considerable
volatility--yes,  major  corrections  and perhaps a full scale bear market.  Are
Alice's  arb fund  returns  realistic?  Remember,  risk  arbitrage  returns  are
impacted  by deal flow,  not the  direction  of the stock  market.  If deal flow
continues to be as robust as we  anticipate  over the next ten years,  arb funds
have the potential to deliver consistent annual returns in the low to mid teens.
So, this hypothetical scenario may prove remarkably accurate.

AT THIS JUNCTURE, YOU MAY BE WONDERING WHERE IS THE RISK IN RISK ARBITRAGE?

      The biggest  risk in risk  arbitrage is that  announced  deals will not be
consummated and that the stock of the company to be acquired will sink following
a bust up in the deal. In fact, in virtually  every  individual  risk  arbitrage
investment,  upside  potential is dwarfed by downside  risk. One old time pundit
said it best ...  "arbitrage is the only business we know where you risk dollars
to make  nickels." The second biggest risk is that the deal may take much longer
to close than first  anticipated,  turning an attractive  annualized gain into a
much more modest return.

      Deals do break for a variety of reasons and a busted deal generally  means
a big loss.  However,  during this third great wave of mergers and acquisitions,
96.5% of all announced  deals have been  consummated.  That puts the odds in the
arbritrageur's favor, particularly if he or she knows how to analyze a deal in a
manner  that helps  avoid  most,  if not all,  of the  inevitable  potholes.  An
adequately  diversified  arbitrage  portfolio  is  a  must.  A  diversified  arb
portfolio can  withstand the large loss from a broken deal and still  generate a
positive  return.  Regarding the timing issue,  deals do get stretched  out, but
provided  one is not  investing  with  leverage  or having to bear the cost of a
short  position in a stock swap deal,  this  generally  results in a more modest
gain rather than a loss. Due to the complexities of most deals and because broad
diversification is absolutely  essential,  in my opinion, risk arbitrage is best
left to organizations  with research and trading expertise and sufficient assets
to support a fully diversified arb portfolio.

      But,  just because you can't do it at home,  doesn't  mean that  investors
shouldn't take  advantage of this  relatively low risk strategy to create wealth
through  the  magic  of  compounding  returns.   There  are  numerous  arbitrage
partnerships open to individual investors.

                                         7
<PAGE>

      So, when the next deal is announced,  remember it is still not too late to
buy and earn an attractive return on your investment.

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.

BUSH BOAKE ALLEN INC. (BOA - $24.5625 - NYSE) is a major,  international flavor,
fragrance and aroma chemical company as well as a producer of fine chemicals and
chemical intermediates for industrial and agricultural applications. The company
conducts  business  on six  continents  and  has 63  locations  in 39  countries
worldwide.  Flavors  produced by Bush Boake Allen are used in  beverages,  dairy
products, baked goods,  confectionery items and processed foods. BOA's fragrance
compounds are used by consumer  product  manufacturers in perfumes and colognes,
soaps,  detergents  and  cleaners,  air  fresheners,  cosmetics and a variety of
personal care products.

CITIZENS  UTILITIES  CO.  (CZN -  $14.1875 - NYSE)  provides  telecommunications
services  and public  services  to  approximately  1.8 million  customers  in 21
states.  Citizens  owns 83% of Electric  Lightwave  (ELIX - $18.75 - Nasdaq),  a
competitive  local exchange carrier ("CLEC") serving  primarily the western U.S.
Last year, management authorized the separation of Citizens'  telecommunications
businesses and public services businesses into two stand-alone,  publicly traded
companies.  Recently,  CZN  announced  agreements to acquire about 900,000 rural
access  lines  in 11  states  for $2.8  billion.  CZN  intends  to  finance  the
transactions  by  divesting  its  public  services  operations.  It has  already
announced the sale of its water  operations to American Water Resources for $835
million.  The company has sold its 16% stake in Centennial  Cellular  Corp.  for
approximately  $205  million.  Citizens has  monetized  its ownership of Century
Communications'  (CTYA - $45.625 - Nasdaq) stock and cable operations  through a
sale to Adelphia Communications for approximately $220 million.

EASTERN  ENTERPRISES  (EFU -  $57.4375  - NYSE)  owns and  operates  Boston  Gas
Company,  Colonial Gas  Company,  Essex Gas Company,  Midland  Enterprises,  and
ServicEdge  Partners.  Upon  completion of the pending merger with  EnergyNorth,
Eastern will serve over 800,000  residential,  commercial and industrial natural
gas  customers  in  Massachusetts  and  New  Hampshire.   Midland   Enterprises,
headquartered  in Cincinnati,  Ohio, is the leading  carrier of coal and a major
carrier of other dry bulk cargoes on the nation's inland waterways, with a fleet
of 2,399 barges and 87 towboats.  ServicEdge is the largest unregulated provider
of  residential  HVAC  equipment   installation  and  service  to  customers  in
Massachusetts.  Eastern Enterprises has signed a definite merger agreement under
which  KeySpan  Energy will acquire all the common stock of Eastern  Enterprises
for $64.00 per share in cash.

KAMAN  CORP.  (KAMNA - $12.875 - NASDAQ),  founded in 1945,  is a pioneer in the
helicopter industry.  Aircraft  manufacturing  remains the core of the business.
Kaman  services both  commercial  and government  markets with  helicopters  and
aircraft  components.  The company also produces  specialized,  high-value niche
market  products and services  which tend to be  technological  leaders in their
markets. Kaman Industrial Technologies,  located in Windsor,  Connecticut is one
of the largest industrial distributors of replacement parts, including bearings,
power transmission, motion control and materials handling

                                        8

<PAGE>

components  to nearly every section of industry in North  America.  Kaman Music,
headquartered in Bloomfield,  Connecticut, is one of the largest distributors of
music instruments in the world,  distributing more than 13,000 items,  including
violins,  horns,  guitars,  drums and accessories to music retailers  throughout
North America.

LIBERTY CORP. (LC - $42.1875 - NYSE),  headquartered  in Greenville,  S.C., is a
holding company with operations in broadcasting and insurance.  Liberty's Cosmos
Broadcasting owns and operates eleven network affiliated  television stations in
the Southeast and Midwest.  Six stations are affiliated with NBC, three with ABC
and two with CBS.  These  stations  serve  more than  four  million  households.
Liberty Life is a regional  insurer,  with North  Carolina,  South  Carolina and
Louisiana  accounting  for more than 50% of its premium  volume.  The  insurance
segment specializes in providing agency (home service) and mortgage  protection,
life and health insurance.  In February 1999, Liberty hired an investment banker
and began a strategic review which may result in a spinoff.

SPRINT CORP.  (FON.A - $74.25 - NYSE) is the third largest long distance carrier
and the second largest  independent  local telephone  company in the U.S. Sprint
has positioned  itself globally  through a joint venture called  GlobalOne.  Its
joint venture partners,  France Telecom and Deutsche Telekom, also have a direct
20% stake in Sprint.  FON faces risks from  prospective new entrants in its long
distance  business  which may be offset by the "ION" high bandwith  network that
the company is  developing,  and by other new services.  On October 5, 1999, MCI
WorldCom  announced  plans to acquire Sprint for $125 billion in stock and cash.
The  transaction  is  expected  to  close in about  12  months  upon  regulatory
approval.  Sprint PCS group is the leading all digital  personal  communications
services  ("PCS")  carrier  in the U.S.  with over four  million  customers  and
licenses  covering over 230 million people.  Sprint PCS will be acquired as part
of MCI WorldCom's (WCOM - $53.0625 - Nasdaq) acquisition of Sprint Corp.

WICOR INC. (WIC - $29.1875 - NYSE), headquartered in Milwaukee, is a diversified
holding  company  whose  subsidiaries   provide  natural  gas  distribution  and
manufacture  pumps  and  fluid  processing   equipment,   including   filtration
equipment.  WICOR is the parent of Wisconsin  Gas Company,  which is the state's
largest gas utility serving about 530,000 customers. In June, WICOR agreed to be
acquired by Wisconsin Energy Corporation (WEC - $19.25 - NYSE) for approximately
$1.275  billion plus the  assumption of $230 million of Wicor debt. The combined
companies  will serve over one  million  electric  customers  in  Wisconsin  and
Michigan's Upper Peninsula and serve more than 920,000 gas customers.

MINIMUM INITIAL INVESTMENT - $1,000

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

INTERNET

      You   can   now   visit   us  on  the   Internet.   Our   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 send us e-mail at [email protected].

                                     9

<PAGE>

IN CONCLUSION

      Although  the major stock  market  indices  once again  posted  attractive
gains, the breadth of the market continued to deteriorate.  In 1999, more stocks
declined than advanced, and if you exclude richly priced technology stocks, most
market indices would have been flat to down.  Following  rising  interest rates,
bonds experienced their worst year since regular sales of these securities began
22 years ago, posting total return losses for the year. In this very challenging
year for the financial markets,  we are pleased that the ABC Fund portfolio once
again rewarded shareholders with respectable gains.

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

January 31, 2000


- --------------------------------------------------------------------------------
                                TOP TEN HOLDINGS
                                DECEMBER 31, 1999
                                -----------------

        Air Express International Corp.         Aquarion Co.
        WICOR Inc.                              Southwest Gas Corp.
        CommNet Cellular Inc.                   Hannaford Bros. Co.
        United Water Resources Inc.             Catellus Development Corp.
        MidAmerican Energy Holdings Co.         Sprint 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.

                                  10

<PAGE>

THE GABELLI ABC FUND
PORTFOLIO OF INVESTMENTS -- DECEMBER 31, 1999
- --------------------------------------------------------------------------------
                                                         MARKET
 SHARES                                COST              VALUE
 ------                               ------            --------

        COMMON STOCKS -- 66.5%
        AEROSPACE-- 0.1%
 1,000  Northrop Grumman Corp. .   $     55,050       $    54,063
                                   ------------       -----------
        AUTOMOTIVE: PARTS AND ACCESSORIES -- 0.6%
12,000  Federal-Mogul Corp. ....        339,600           241,500
                                   ------------       -----------

        AVIATION: PARTS AND SERVICES -- 1.5%
25,000  Aviall Inc.+ ...........        371,793           204,687
17,000  Fairchild Corp., Cl. ...        325,336            14,062
 7,000  Hi-Shear Industries Inc.         10,215            16,187
22,000  Kaman Corp., Cl. A .....        395,473           283,250
                                   ------------       -----------
                                      1,102,817           658,186
                                   ------------       -----------
        BROADCASTING -- 0.4%
 2,500  Liberty Corp. ..........        121,108           105,469
 1,000  Salem Communications
         Corp., Cl. A+ .........         19,812            22,625
   500  Spanish Broadcasting
         System Inc.+ ..........         10,000            20,125
                                    -----------        ----------
                                        150,920           148,219
                                    -----------        ----------
        BUILDING AND CONSTRUCTION -- 0.2%
10,000  Robertson-Ceco Corp. ...         98,725            98,750
                                    -----------        ----------
        BUSINESS SERVICES -- 1.8%
20,000  Cendant Corp.+ .........        415,158           531,250
 2,580  Fisher Scientific
         International Inc.+ ...         24,892            93,202
16,000  National Processing Inc.+       141,441           142,000
 2,580  ProcureNet Inc.+ .......                              387
                                    -----------        ----------
                                        581,491           766,839
                                    -----------        ----------
        COMMUNICATIONS EQUIPMENT -- 0.1%
 5,000  Dynatech Corp.+ ........        122,000            33,750
   500  L-3 Communications
         Holdings Inc.+ ........         11,000            20,812
                                    -----------        ----------
                                        133,000            54,562
                                    -----------        ----------
        COMPUTER SOFTWARE AND SERVICES -- 0.0%
 1,938  DecisionOne Holdings Corp.+       7,141               969
                                    -----------        ----------
        CONSUMER PRODUCTS -- 1.1%
12,500  Carter-Wallace Inc. ....        147,694           224,219
28,442  Syratech Corp.+ ........        907,944           227,536
                                    -----------        ----------
                                      1,055,638           451,755
                                    -----------        ----------
        DIVERSIFIED INDUSTRIAL -- 0.5%
 6,000  Ampco-Pittsburgh Corp. .         69,606            60,750
11,000  Katy Industries Inc. ...        250,300            95,562
 4,000  WHX Corp.+ .............         41,825            36,000
                                    -----------        ----------
                                        361,731           192,312
                                    -----------        ----------

                                                        MARKET
 SHARES                                   COST           VALUE
 ------                                  ------        --------
        ENERGY AND UTILITIES: ELECTRIC -- 3.9%
65,000  El Paso Electric Co.+ ..     $   529,438      $  637,812
10,000  Florida Progress Corp. .         469,801         423,125
10,000  New England Electric System      492,590         517,500
 5,000  St. Joseph Light & Power Co.     102,750         102,500
                                     -----------      ----------
                                       1,594,579       1,680,937
                                     -----------      ----------
        ENERGY AND UTILITIES: INTEGRATED -- 5.5%
22,000  Florida Public Utilities Co.     329,010         374,000
20,000  MCN Energy Group Inc. ..         486,000         475,000
45,000  MidAmerican Energy
         Holdings Co.+ .........       1,500,687       1,515,937
   286  Sierra Pacific Resources           7,458           4,951
                                     -----------      ----------
                                       2,323,155       2,369,888
                                     -----------      ----------
        ENERGY AND UTILITIES: NATURAL GAS -- 9.9%
20,000  AGL Resources Inc. .....         363,454         340,000
 1,500  Berkshire Energy Resources        52,500          52,500
10,000  Eastern Enterprises ....         565,500         574,375
 2,500  Piedmont Natural Gas Co. Inc.     83,406          75,625
 1,000  Public Service Co. of
         North Carolina ........          29,487          32,312
40,000  Southwest Gas Corp. ....         983,350         920,000
 2,000  Valley Resources Inc. ..          44,600          44,500
75,000  WICOR Inc. .............       2,083,601       2,189,062
                                   -------------      ----------
                                       4,205,898       4,228,374
                                   -------------      ----------
        ENERGY AND UTILITIES: WATER -- 9.0%
39,900  Aquarion Co. ...........       1,435,664       1,476,300
 3,000  E'Town Corp. ...........         186,525         186,750
 4,000  SJW Corp. ..............         476,612         481,000
50,000  United Water Resources Inc.    1,520,822       1,709,375
                                   -------------      ----------
                                       3,619,623       3,853,425
                                   -------------      ----------
        ENTERTAINMENT -- 1.4%
 9,000  Fisher Companies Inc. ..         625,306         555,750
 1,000  Liberty Media Group, Cl. A+       18,625          56,750
                                   -------------      ----------
                                         643,931         612,500
                                   -------------      ----------
        EQUIPMENT AND SUPPLIES -- 1.2%
 3,500  Amphenol Corp., Cl. A+ .          98,857         232,969
 7,674  Juno Lighting Inc. .....         129,390          79,618
10,000  UCAR International Inc.+         186,256         178,125
                                   -------------      ----------
                                         414,503         490,712
                                   -------------      ----------


                 See accompanying notes to financial statements.

                                       11

<PAGE>

THE GABELLI ABC FUND
PORTFOLIO OF INVESTMENTS (CONTINUED) -- DECEMBER 31, 1999
- --------------------------------------------------------------------------------
                                                            MARKET
 SHARES                                   COST              VALUE
 ------                                  ------            --------

         COMMON STOCKS (CONTINUED)
         FINANCIAL SERVICES -- 2.7%
  1,500  Allstate Corp. .........      $   39,638         $    36,000
 31,900  Argonaut Group Inc. ....       1,062,737             634,012
  3,000  Foremost Corp.
           of America ............         84,150              85,125
  5,000  Leucadia National Corp.          174,181             115,625
  5,000  Pioneer Group Inc.+ ....          87,805              78,750
  7,000  Terra Nova (Bermuda)
           Holdings Ltd., Cl. A ..        214,413             210,000
                                       ----------         -----------
                                        1,662,924           1,159,512
                                       ----------         -----------
         FOOD AND BEVERAGE -- 0.2%
 30,000  Advantica Restaurant
           Group Inc.+ ............       320,182              52,500
  3,000  Whitman Corp. ............        52,228              40,313
                                       ----------         -----------
                                          372,410              92,813
                                       ----------         -----------
         HEALTH CARE -- 0.4%
  4,500  Life Technologies Inc. .         167,906             191,813
                                       ----------         -----------
         HOME FURNISHINGS -- 0.5%
320,000  Carlyle Industries Inc.+         150,016             200,000
  8,000  O'Sullivan Industries
          Holdings Inc.+ ........           4,750               4,080
                                       ----------         -----------
                                          154,766             204,080
                                       ----------         -----------
         HOTELS AND GAMING -- 0.1%
  2,500  Boca Resorts Inc., Cl. A+         18,875              24,375
                                       ----------         -----------
         METALS AND MINING -- 0.0%
 10,000  Royal Oak Mines Inc.+ ..          11,858                 416
                                       ----------         -----------
         PUBLISHING -- 0.1%
    900  Penton Media Inc. ......          20,239              21,600
                                       ----------         -----------
         REAL ESTATE -- 2.6%
 70,000  Catellus Development Corp.+    1,175,673             896,875
 20,000  Griffin Land &
           Nurseries Inc.+ .......        322,381             230,000
  3,169  HomeFed Corp.+ .........             567               2,773
                                       ----------         -----------
                                        1,498,621           1,129,648
                                       ----------         -----------

                                                             MARKET
 SHARES                                   COST               VALUE
- --------                                 ------             --------

         REAL ESTATE INVESTMENT TRUSTS -- 1.3%
 50,000  Imperial Credit Commercial
           Mortgage Investment Corp.   $   513,562        $   568,750
                                       -----------        -----------
         RETAIL -- 3.8%
120,000  Bruno's Inc.+ ..........           76,300             16,800
 30,000  Catherines Stores Corp.+          613,094            630,000
 13,000  Hannaford Bros. Co. ....          935,504            901,063
  8,000  Lillian Vernon Corp. ...          132,815             89,000
                                       -----------        -----------
                                         1,757,713          1,636,863
                                       -----------        -----------
         SATELLITE -- 0.5%
 10,000  COMSAT Corp. ...........          205,500            198,750
                                       -----------        -----------
         SPECIALTY CHEMICALS -- 0.4%
  7,000  Bush Boake Allen Inc.+ .          207,887            171,938
                                       -----------        -----------
         TELECOMMUNICATIONS -- 1.8%
 30,603  Citizens Utilities Co., Cl. B+    301,244            434,180
  9,500  Shenandoah
           Telecommunications Co.          214,381            320,625
  3,000  Telegroup Inc.+ ........               32                  3
                                       -----------        -----------
                                           515,657            754,808
                                       -----------        -----------
         TRANSPORTATION -- 10.2%
135,000  Air Express
          International Corp. ....       4,347,500          4,362,188
                                       -----------        -----------
         WIRELESS COMMUNICATIONS -- 4.7%
  2,000  American Tower Corp., Cl. A+       31,009             61,125
 60,500  CommNet Cellular Inc.+ ....     1,433,787          1,943,563
                                       -----------        -----------
                                         1,464,796          2,004,688
                                       -----------        -----------
         TOTAL COMMON STOCKS            29,608,016         28,425,233
                                       -----------        -----------

         PREFERRED STOCKS -- 3.8%
         DIVERSIFIED INDUSTRIAL -- 1.2%
 11,000  WHX Corp.,
          6.50% Cv. Pfd., Ser. A ....      519,237            356,813
  6,000  WHX Corp.,
          $3.75 Cv. Pfd., Ser. B ....      259,432            154,875
                                       -----------        -----------
                                           778,669            511,688
                                       -----------        -----------


                 See accompanying notes to financial statements.

                                       12

<PAGE>

THE GABELLI ABC FUND
PORTFOLIO OF INVESTMENTS (CONTINUED) -- DECEMBER 31, 1999
- --------------------------------------------------------------------------------
                                                             MARKET
 SHARES                                   COST               VALUE
- --------                                 ------             --------

          PREFERRED STOCKS (CONTINUED)
          TELECOMMUNICATIONS -- 2.6%
    4,000 Citizens Utilities Co.,
           5.00% Cv. Pfd. ..........    $   194,320        $   225,500
   12,000 Sprint Corp.,
           8.25% Cv. Pfd. ..........        444,208            891,000
                                        -----------        -----------
                                            638,528          1,116,500
                                        -----------        -----------
          TOTAL PREFERRED STOCKS          1,417,197          1,628,188
                                       -----------        -----------
PRINCIPAL
  AMOUNT
- ---------

          CORPORATE BONDS -- 0.1%
          RETAIL-- 0.0%
 $200,000 RDM Sports Group Inc., Cv.
           8.00%, 08/15/03 .........         25,866             18,000
                                        -----------        -----------
          TRANSPORTATION -- 0.1%
  850,000 Builders Transport Inc., Cv.
           6.50%, 05/01/11 .........         40,956             12,750
  140,000 WorldCorp. Inc.,
           Sub. Deb. Cv.,
           7.00%, 05/15/04 .........         25,192             23,800
                                        -----------        -----------
                                             66,148             36,550
                                        -----------        -----------
          TOTAL CORPORATE BONDS              92,014             54,550
                                        -----------        -----------

          U.S. GOVERNMENT OBLIGATIONS -- 4.8%
2,080,000 U.S. Treasury Bills,
           5.30% to 5.42%++,
           due 03/16/00 to 03/23/00      2,055,575          2,057,019
                                       -----------        -----------


                                                             MARKET
                                           COST              VALUE
                                          ------           ---------
TOTAL INVESTMENTS -- 75.2%             $33,172,802         $32,164,990
                                       ===========
              OTHER ASSETS AND
               LIABILITIES (NET) -- 24.8% ...........       10,618,497
                                                           -----------
              NET ASSETS-- 100.0%
               (4,532,793 shares outstanding) ......       $42,783,487
                                                           ===========
              NET ASSET VALUE,
               OFFERING AND REDEMPTION
               PRICE PER SHARE .....................             $9.44
                                                                 =====
 -----------------
              For Federal tax purposes:
              Aggregate cost .......................      $ 33,184,803
                                                          ============
              Gross unrealized appreciation ........       $ 2,436,547
              Gross unrealized depreciation ........        (3,456,360)
                                                          ------------
              Net unrealized appreciation ..........      $ (1,019,813)
                                                          ============
 -----------------
+  Non-income producing security.
++ Represents annualized yield at date of purchase.

                 See accompanying notes to financial statements.

                                       13

<PAGE>

                              THE GABELLI ABC FUND
STATEMENT OF ASSETS AND LIABILITIES
DECEMBER 31, 1999
- --------------------------------------------------------------------------------
ASSETS:
  Investments, at value (Cost $33,172,802) ............   $32,164,990
  Dividends and interest receivable ...................        67,547
  Receivable for investments sold .....................       864,000
  Receivable for Fund shares sold .....................    10,001,000
                                                          -----------
  TOTAL ASSETS ........................................    43,097,537
                                                          -----------
LIABILITIES:
  Payable for Fund shares redeemed ....................       175,851
  Payable for investment advisory fees ................        39,295
  Payable for distribution fees .......................         9,824
  Payable to custodian ................................        19,548
  Other accrued expenses ..............................        69,532
                                                          -----------
  TOTAL LIABILITIES ...................................       314,050
                                                          -----------
  NET ASSETS applicable to 4,532,793
    shares outstanding ................................   $42,783,487
                                                          ===========

NET ASSETS CONSIST OF:
  Capital stock, at par value .........................        $4,533
  Additional paid-in capital ..........................    43,798,767
  Distributions in excess of net realized
    gain on investments ...............................       (12,001)
  Net unrealized depreciation on investments ..........    (1,007,812)
                                                          -----------
  TOTAL NET ASSETS ....................................   $42,783,487
                                                          ===========
  NET ASSET VALUE, offering and redemption
    price per share ($42,783,487 / 4,532,793
    shares outstanding; 1,000,000,000 shares
    authorized of $0.001 par value) ...................         $9.44
                                                                =====

STATEMENT OF OPERATIONS
FOR THE YEAR ENDED DECEMBER 31, 1999
- ----------------------------------------------------------
INVESTMENT INCOME:
  Dividends ........................   $   683,081
  Interest .........................     1,362,414
                                       -----------
  TOTAL INVESTMENT INCOME ..........     2,045,495
                                       -----------
EXPENSES:
  Investment advisory fees .........       718,694
  Distribution fees ................       179,687
  Shareholder communications expenses       47,169
  Shareholder services fees ........        34,335
  Legal and audit fees .............        26,917
  Registration fees ................        26,689
  Custodian fees ...................        14,607
  Directors' fees ..................         7,566
  Miscellaneous expenses ...........         4,334
                                       -----------
  TOTAL EXPENSES ...................     1,059,998
                                       -----------
  NET INVESTMENT INCOME ............       985,497
                                       -----------
NET REALIZED AND UNREALIZED GAIN
  ON INVESTMENTS:
  Net realized gain on investments .     5,778,370
  Net change in unrealized depreciation
    on investments .................      (903,185)
                                       -----------
  NET REALIZED AND UNREALIZED GAIN
    ON INVESTMENTS .................     4,875,185
                                       -----------
  NET INCREASE IN NET ASSETS RESULTING
    FROM OPERATIONS ................    $5,860,682
                                       ===========

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


                                                                  Year Ended            Year Ended
                                                               December 31, 1999     December 31, 1998
                                                               -----------------     -----------------
<S>                                                            <C>                   <C>
OPERATIONS:

   Net investment income ..............................        $    985,497          $    486,648
   Net realized gain on investments ...................           5,778,370             3,415,128
   Net change in unrealized depreciation on investments            (903,185)           (1,144,585)
                                                               ------------          ------------
   NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS           5,860,682             2,757,191
                                                               ------------          ------------
DISTRIBUTIONS TO SHAREHOLDERS:
   Net investment income ..............................            (463,667)             (480,873)
   In excess of net investment income .................                  --                (8,540)
   Net realized gain on investments ...................          (2,734,053)           (3,418,797)
   In excess of net realized gain on investments ......                  --               (13,798)
                                                               ------------         -------------
  TOTAL DISTRIBUTIONS TO SHAREHOLDERS .................          (3,197,720)           (3,922,008)
                                                               ------------         -------------
CAPITAL SHARE TRANSACTIONS:
   Net increase in net assets from capital share transactions       762,387             5,294,948
                                                               ------------         -------------
  NET INCREASE IN NET ASSETS ..........................           3,425,349             4,130,131
NET ASSETS:

   Beginning of period ................................          39,358,138            35,228,007
                                                               ------------         -------------
   End of period ......................................        $ 42,783,487         $  39,358,138
                                                               ============         =============
</TABLE>

                 See accompanying notes to financial statements.

                                       14

<PAGE>

THE GABELLI ABC FUND
NOTES TO FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------

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 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-

                                       15

<PAGE>

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

to-market on a daily basis to maintain the  adequacy of the  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 December 31, 1999, 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,
distributions  that  were  deemed  to be made  upon  redemption  of  shares  and
differing characterization of distributions made by the Fund.

For the year ended  December 31, 1999,  reclassifications  were made to decrease
accumulated  undistributed  net  investment  income for  $521,830  and  decrease
distributions  in excess of net realized gain on investments for $3,035,516 with
an offsetting adjustment to additional paid-in capital.

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.

                                       16

<PAGE>

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

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 year ended
December 31, 1999,  the Fund  incurred  distribution  costs payable to Gabelli &
Company,  Inc.,  an affiliate of the Adviser,  of $179,687,  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 year ended
December 31, 1999, other than short term securities, aggregated $277,450,777 and
$278,397,420, respectively.

6.  TRANSACTIONS  WITH AFFILIATES.  During the year ended December 31, 1999, the
Fund paid brokerage  commissions of $289,027 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 against the line of credit during
the year ended December 31, 1999.

8. CAPITAL STOCK  TRANSACTIONS.  Transactions in shares of capital stock were as
follows:
<TABLE>
<CAPTION>
                                                       Year Ended                        Year Ended
                                                    December 31, 1999                 December 31, 1998
                                              ----------------------------      -----------------------------
                                                Shares           Amount           Shares            Amount
                                              ----------      ------------      ----------       ------------
<S>                                           <C>             <C>                <C>              <C>
Shares sold ................................   8,133,675      $ 79,459,417       6,122,609       $ 62,705,757
Shares issued upon reinvestment of dividends     331,243         3,087,197         313,982          2,982,885
Shares redeemed ............................  (8,037,283)       81,784,227)     (5,773,794)       (60,393,694)
                                              ----------     -------------      ----------       ------------
    Net increase ...........................     427,635      $    762,387         662,797       $  5,294,948
                                              ==========     =============      ==========       ============
</TABLE>

                                       17

<PAGE>

THE GABELLI ABC FUND
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
Selected data for a share of capital stock outstanding throughout each period:
<TABLE>
<CAPTION>

                                                           Year Ended December 31,
                                              -----------------------------------------------
                                               1999      1998       1997      1996      1995
                                              ------    ------     ------    ------    ------
<S>                                           <C>       <C>        <C>       <C>       <C>
OPERATING PERFORMANCE:
   Net asset value, beginning of period ...   $  9.59   $ 10.23    $  9.84   $  9.71   $  9.57
                                              -------   -------    -------   -------   -------
   Net investment income ..................      0.26      0.22       0.08      0.21      0.21
   Net realized and unrealized gain
     on investments .......................      0.59      0.90       1.17      0.54      0.86
                                              -------   -------    -------   -------   -------
                                                 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 .........   $  9.44   $  9.59    $ 10.23   $  9.84   $  9.71
                                              =======   =======    =======   =======   =======
   Total return+ ..........................      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) ...   $42,783   $39,358    $35,228   $26,801   $19,862
   Ratio of net investment income
     to average net assets ................     1.37%     1.00%      0.87%     2.11%     1.83%
   Ratio of operating expenses
     to average net assets (b) ............     1.47%     1.69%      2.26%     2.09%     2.10%
   Portfiolio turnover rate ...............      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.
(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.

                 See accompanying notes to financial statements.

                                       18
<PAGE>

THE GABELLI ABC FUND
REPORT OF GRANT THORNTON LLP, INDEPENDENT AUDITORS
- --------------------------------------------------------------------------------
Shareholders and Board of Directors of
The Gabelli ABC Fund

We have audited the accompanying statement of assets and liabilities,  including
the  portfolio  of  investments,  of The  Gabelli  ABC  Fund  (one of the  Funds
constituting  Gabelli Investor Funds, Inc.) as of December 31, 1999, the related
statement of operations  for the year then ended,  the  statements of changes in
net  assets for each of the two years in the  period  then  ended and  financial
highlights for each of the periods  presented.  These  financial  statements and
financial  highlights  are the  responsibility  of the  Fund's  management.  Our
responsibility  is to  express  an opinion  on these  financial  statements  and
financial highlights based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United  States.  Those  standards  require  that we plan and  perform the
audits to obtain reasonable assurance about whether the financial statements and
financial  highlights  are free of  material  misstatement.  An  audit  includes
examining,  on a test basis,  evidence supporting the amounts and disclosures in
the financial  statements.  Our procedures  included  confirmation of securities
owned as of December 31, 1999 by  correspondence  with the  custodian.  An audit
also includes assessing the accounting principles used and significant estimates
made by  management,  as well as  evaluating  the  overall  financial  statement
presentation.  We believe  that our audits  provide a  reasonable  basis for our
opinion.

In our opinion,  the financial  statements and financial  highlights referred to
above present fairly, in all material  respects,  the financial  position of The
Gabelli ABC Fund at December 31, 1999,  and the results of its  operations,  the
changes in its net assets and the financial highlights for the respective stated
periods,  in conformity with  accounting  principles  generally  accepted in the
United States.

                                              /s/ SIGNATURE
                                              Grant Thorton, LLP

New York, New York
February 11, 2000

- --------------------------------------------------------------------------------
                   1999 TAX NOTICE TO SHAREHOLDERS (Unaudited)

For the fiscal year ended December 31, 1999, the Fund paid to  shareholders,  on
December 27, 1999, an ordinary  income  dividend  (comprised  of net  investment
income  and short term  capital  gains)  totaling  $0.94 per share and long term
capital gains totaling  $0.06 per share.  For the fiscal year ended December 31,
1999, 21.13% of the ordinary income dividend qualifies for the dividend received
deduction available to corporations.

U.S. GOVERNMENT INCOME:

The  percentage of the ordinary  income  dividend paid by the Fund during fiscal
year 1999 which was derived  from U.S.  Treasury  securities  was  43.95%.  Such
income is exempt from state and local tax in all states.  However,  many states,
including  New York and  California,  allow a tax exemption for a portion of the
income  earned only if a mutual fund has  invested at least 50% of its assets at
the end of each quarter of the Fund's fiscal year in U.S. Government securities.
The Gabelli ABC Fund did not meet this strict  requirement  in 1999.  Due to the
diversity  in state and local tax law, it is  recommended  that you consult your
personal tax advisor as to the applicability of the information provided to your
specific situation.
- --------------------------------------------------------------------------------

                                       19
<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 JAMES E. MCKEE
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.
- --------------------------------------------------------------------------------
GAB408Q499SR




                                                [PHOTO OF MARIO GABELLI OMITTED]
THE
GABELLI ABC
[GRAPHIC OMITTED]
FUND

                                                                   ANNUAL REPORT
                                                               DECEMBER 31, 1999




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