GABELLI EQUITY SERIES FUNDS INC
N-30D, 2000-03-07
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                        THE GABELLI SMALL CAP GROWTH FUND



                              FIRST QUARTER REPORT
                              DECEMBER 31, 1999(A)







TO OUR SHAREHOLDERS,

      Small cap stocks  rallied in the  fourth  quarter of 1999 and the  Russell
2000 Index closed the year at a record high. However, this year's market advance
had  little  breadth.  Technology  stocks,  and  particularly  Internet  related
companies,  were big  winners,  while most  other  industry  groups  languished.
Despite the Fund's limited  commitments to technology  and Internet  stocks,  it
closed the year with competitive returns relative to the Russell 2000 benchmark.

INVESTMENT PERFORMANCE

      For the quarter  ended  December  31, 1999,  The Gabelli  Small Cap Growth
Fund's (the "Fund") total return was 9.88%. The Value Line Composite and Russell
2000  Indices  had  returns  of 6.67% and  18.44%,  respectively,  over the same
period. Each index is an unmanaged  indicator of stock market  performance.  The
Fund was up 14.22% for 1999.  The Value Line  Composite and Russell 2000 Indices
rose 10.56% and 21.26%, respectively, over the same twelve-month period.

      For the five-year  period ended December 31, 1999, the Fund's total return
averaged  16.90%  annually  versus  average  annual total  returns of 17.78% and
16.69% for the Value Line  Composite  and Russell  2000  Indices,  respectively.
Since  inception on October 22, 1991 through  December 31, 1999,  the Fund had a
cumulative  total return of 284.65%,  which  equates to an average  annual total
return of 17.86%.

WHAT WE DO

      We view the small  capitalization  stock market as a research driven stock
picker's paradise. Unlike the large cap market, where most companies are closely
followed  by dozens of Wall  Street  analysts,  the small cap  market is largely
unclaimed  territory.  Our analysts put on their  hiking  shoes,  strap on their
backpacks and hit the trails  looking for little  companies Wall Street does not
know or care about. They are seeking a particular type of company, which we

      [Graphic of pyramid omitted--text as follows]

      EPS

      PMV

      MANAGEMENT

      CASH FLOW

      RESEARCH

      [End of Pyramid text]

- --------------------------------------------------------------------------------
(a) The Fund's fiscal year ends September 30.

<PAGE>

INVESTMENT RESULTS (a)(c)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                  Calendar Quarter
                                                   -------------------------------------------
                                                    1st          2nd         3rd          4th         Year
                                                    ---          ---         ---          ---         ----
<S>                                                <C>         <C>         <C>          <C>          <C>
 1999:    Net Asset Value ......................   $19.59      $22.94      $21.84       $21.43       $21.43
          Total Return .........................    (6.8)%      17.1%       (4.8)%        9.9%        14.2%
- --------------------------------------------------------------------------------------------------------------
 1998:    Net Asset Value ......................   $23.93      $23.59      $18.81       $21.01       $21.01
          Total Return .........................    10.9%       (1.4)%     (20.3)%       14.7%         0.0%
- --------------------------------------------------------------------------------------------------------------
 1997:    Net Asset Value ......................   $19.11      $22.23      $25.42       $21.58       $21.58
          Total Return .........................     3.1%       16.3%       14.7%        (0.8)%       36.5%
- --------------------------------------------------------------------------------------------------------------
 1996:    Net Asset Value ......................   $19.65      $20.68      $20.02       $18.53       $18.53
          Total Return .........................     6.2%        5.2%       (3.2)%        3.4%        11.9%
- --------------------------------------------------------------------------------------------------------------
 1995:    Net Asset Value ......................   $17.03      $17.88      $19.34       $18.50       $18.50
          Total Return .........................     7.4%        5.0%        8.2%         2.6%        25.2%
- --------------------------------------------------------------------------------------------------------------
 1994:    Net Asset Value ......................   $16.76      $16.33      $17.24       $15.85       $15.85
          Total Return .........................    (3.6)%      (2.6)%       5.6%        (2.1)%       (2.9)%
- --------------------------------------------------------------------------------------------------------------
 1993:    Net Asset Value ......................   $15.46      $15.74      $16.90       $17.38       $17.38
          Total Return .........................     6.6%        1.8%        7.4%         5.3%        22.8%
- --------------------------------------------------------------------------------------------------------------
 1992:    Net Asset Value ......................   $13.42      $13.41      $13.10       $14.50       $14.50
          Total Return .........................     9.9%       (0.1)%      (2.3)%       12.1%        20.3%
- --------------------------------------------------------------------------------------------------------------
 1991:    Net Asset Value ......................      __          __         __         $12.21       $12.21
          Total Return .........................      __          __         __          22.9%(b)     22.9%(b)
- --------------------------------------------------------------------------------------------------------------
</TABLE>

- ----------------------------------------------
Average Annual Returns - December 31, 1999 (a)
- ----------------------------------------------

  1 Year ..........................  14.22%
  5 Year ..........................  16.90%
  Life of Fund (b) ................  17.86%
- ----------------------------------------------

                   Dividend History
- -------------------------------------------------------
Payment (ex) Date   Rate Per Share   Reinvestment Price
- -----------------   --------------   ------------------
December 20, 1999       $2.462             $20.55
December 21, 1998       $0.534             $19.80
December 29, 1997       $3.590             $21.29
September 30, 1997      $0.070             $25.42
December 27, 1996       $2.160             $18.46
December 29, 1995       $1.340             $18.50
December 30, 1994       $1.030             $15.85
December 31, 1993       $0.420             $17.38
December 31, 1992       $0.185             $14.50
December 31, 1991       $0.080             $12.21

(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 October 22,
1991.  (c) The Fund's fiscal year ends  September  30. Note:  Investing in small
capitalization  securities  involves special challenges because these securities
may trade less  frequently and experience more abrupt price movements than large
capitalization securities.
- --------------------------------------------------------------------------------

                                       2
<PAGE>

would describe generally as having a dominant market share, niche franchise in a
growing and/or consolidating industry.

      Our analysts are guided by specific  investment  principles  that include:
experienced  management,  healthy  balance  sheets and rising free cash flow and
earnings.  They also live by  certain  value  parameters--their  goal is to find
great  companies  trading at  reasonable  valuations  relative  to "real  world"
economic worth.  These are the kinds of companies we can feel comfortable owning
long term, rather than trading like so many small cap investors are prone to do.

COMMENTARY

      The  following  excerpts  were  selected  from  comments  made by Mario J.
Gabelli,  our Chief Investment  Officer,  that appeared in the December 31, 1999
edition of OUTSTANDING INVESTOR DIGEST:

      "FIRST, A QUICK OVERVIEW ON THE MARKET...  THE ECONOMY LOOKS TERRIFIC. THE
WORLD IS REFLATING. JAPAN IS GOING TO DO QUITE WELL. EUROLAND, WHICH IS THE NAME
THAT WE USE FOR MAINLAND EUROPE, IS TERRIFIC. WE THINK EARNINGS FOR THE S&P THIS
YEAR AND NEXT WILL BE UP BY DOUBLE DIGITS, PARTICULARLY AS NON-U.S. EARNINGS ARE
TRANSLATED INTO U.S. DOLLARS WITH THE BENEFIT OF THAT STRONGER ECONOMY.

      THE RUSSELL 2000,  HOWEVER,  COULD BE UP SUBSTANTIALLY  MORE THAN THAT. WE
DON'T PUT OUR [OWN]  NUMBERS  TOGETHER,  BUT WE USE A MERRILL LYNCH TYPE NUMBER,
AND WE'RE  LOOKING AT 20% [PER YEAR] FOR BOTH YEARS.  SO WE THINK  THAT'S A GOOD
ECONOMIC BACKDROP...

      WE'RE REALLY BOTTOM-UP STOCK PICKERS. WE HAVE A STRONG FOCUS AND INTENSITY
[ON] RESEARCH. WE READ 10-QS, 10-KS AND VISIT COMPANIES...

      THE  INVESTMENT  PROCESS  THAT WE FOLLOW IS FAIRLY  SIMPLE.  ANALYSTS  ARE
ASSIGNED TO FOLLOW  INDUSTRIES ON A COMPANY BASIS.  FOR EXAMPLE,  IF YOU WANT TO
KNOW  ABOUT  BROADCASTING,  WE KNOW IT.  WE THINK  SHORT  TERM,  THERE'S A GREAT
OPPORTUNITY  IN THE  BROADCASTERS.  BILL  KENNARD AT THE FEDERAL  COMMUNICATIONS
COMMISSION  SOUNDED A GONG IN AUGUST  WHEN HE SAID EVERY TV STATION  OPERATOR IN
THE  COUNTRY  CAN  NOW OWN TWO TV  STATIONS.  SO  WE'RE  BUYING  GRANITE  IN THE
PORTFOLIO,  THE  [UNITED  TELEVISIONS]  THAT  WE  OWN  IN  THE  PORTFOLIO,  WILL
ANNOUNCE... WHO THEY'RE GOING TO PARTNER WITH...

      IDEALLY, WE LIKE DOMESTIC,  CASH-GENERATING COMPANIES. BUT WITH THE BERLIN
WALL HAVING GONE DOWN ALMOST 10 YEARS AGO, WE HAVE A GREAT OPPORTUNITY  GLOBALLY
TO EARN A RETURN WHEREVER A COMPANY EXISTS.

      FOR  EXAMPLE,  MTV,  WHEN IT FIRST  WENT  PUBLIC  HAD LESS THAN 20 MILLION
VIEWERS. TODAY, THERE [ARE] CLOSE TO 400 MILLION PEOPLE WHO CAN WATCH MTV AT ANY
POINT IN TIME.  AND WE LIKE THAT.  WE LIKE TO FIND  GROWING  COMPANIES  THAT CAN
LEVERAGE THEIR BUSINESS ON A GLOBAL BASIS.

      TAKE A SIMPLE THING LIKE TEA: CELESTIAL  [SEASONINGS] IS AN IMPORTANT PART
OF OUR PORTFOLIO. IT DOMINATES THE MARKET FOR GREEN TEA. TEA IS GOOD FOR YOU...

                                       3
<PAGE>

      WE LOOK FOR STOCKS THAT [CAN APPRECIATE] 50% IN TWO YEARS. AND WE LOOK FOR
A CATALYST, SOMETHING THAT'S CHANGING, [THAT WILL UNLOCK THE VALUE]... [WE HAVE]
THE...  ABILITY TO SHIFT  THINGS  AROUND,  [BETWEEN]  VALUE/GROWTH,  LONG/SHORT,
INTERNET/STEEL,  ETC.  SO HOW AND  WHERE  DOES A  GRAHAM & DODD  INVESTOR  IN AN
INTERNET  WORLD FIND NET-NETS?  HOW DO YOU MAKE MONEY BY FINDING  COMPANIES THAT
ARE CLEARLY GOING TO DRIVE THE WORLD?

      ALL OF US - EVERY  SINGLE  ONE OF US - ARE  EXTRAORDINARILY  BLESSED TO BE
HERE IN THIS INTERNET  WORLD.  IF I'D BEEN HERE IN 1454, I BET I'D HAVE SAID THE
SAME THING ABOUT GUTENBERG AND THE PRINTING  PRESS:  "YOU MEAN TO TELL ME WE CAN
PUT THE  MONKS  OUT OF WORK  AND  HAVE  BOOKS  FOR  ALL OF US TO  READ?!  THAT'S
FABULOUS!" WELL, THE INTERNET'S DOING ALL OF THAT.

      THE  ANALYSTS  IN OUR FIRM ARE TOLD:  "GATHER  THE  DATA,  ARRAY THE DATA,
PROJECT THE DATA AND COME UP WITH  ECONOMIC  CONCLUSIONS."  WELL,  THE  INTERNET
ALLOWS YOU TO GATHER THE DATA MORE  EFFICIENTLY.  IT'S A WONDERFUL TOOL. BUT FOR
ALL OF US, IT'S CHANGING [VERY RAPIDLY]. AND HOW DO WE GENERATE [A RETURN]?...

      YOU'VE ALL ASKED THAT QUESTION OF GROWTH VERSUS VALUE. AND WE HAVE A CHART
THAT SHOWS HOW VALUE HAS PERFORMED  RELATIVE TO THE  BENCHMARK  OVER THE LAST 21
YEARS SINCE WE FOUNDED THE FIRM.  IN 1976,  WHY DID VALUE DO SO WELL?  IT WASN'T
COMPLICATED. WHEN YOU HAVE NO CONVICTION THAT YOU CAN PROJECT THE FUTURE, WHAT'S
IN HAND IS WORTH A LOT MORE. YOU HAVE VARIOUS  CYCLES IN WHICH VALUE  FUNCTIONS.
TODAY,  WE'RE DOWN AT THE BOTTOM OF THE  CHART.  WHY?  BECAUSE WE BELIEVE WE CAN
PROJECT FAR INTO THE  FUTURE.  SO IT'S NOT A  COMPLICATED  WORLD WE LIVE IN. AND
THAT MAKES GROWTH EVEN MORE  ATTRACTIVE,  THE MORE CONFIDENCE AND CONVICTION YOU
HAVE THAT THINGS MAINTAIN THEMSELVES...

      WHILE WE EXPECT A BUMPIER  EXPERIENCE  IN MANAGING A SMALL GROWTH  COMPANY
PORTFOLIO VERSUS A LARGE-CAP  PORTFOLIO,  WE BELIEVE IN THE LONG RUN, IT WILL BE
WORTH IT.

      RUSSELL 2000'S EARNINGS WILL MATERIALLY EXCEED THE S&P'S...THE EARNINGS OF
THE  RUSSELL  2000 WILL BE UP 20%-25%  PER YEAR FOR THE NEXT TWO YEARS.  AND THE
S&P'S [ARE  EXPECTED TO BE] UP IN THE LOW DOUBLE  DIGITS,  10%, 11%, 12%. SO THE
CONCLUSION IS THAT A POWERFUL, POWERFUL TAILWIND OF VERY GOOD EARNINGS IS ON THE
WAY...

      THE RUSSELL 2000 HAS BETTER EARNINGS AND LOWER VALUATIONS. AND, THEREFORE,
IT'S JUST READY TO EXPLODE  IN TERMS OF  UPSIDE.  THERE WERE 7,000  TRANSACTIONS
LAST YEAR IN THE U.S.  AND WHILE YOU TALK ABOUT WARNER  LAMBERT,  AND WHILE IT'S
FUN TO TALK ABOUT CBS AND VIACOM,  7,000  TRANSACTIONS  TOOK PLACE,  AND MOST OF
THEM [WERE UNDER] $200 MILLION. SO IT REALLY [HAS] BEEN THE SMALLER COMPANIES...

      THERE ARE A LOT OF STRUCTURAL  REASONS WHY PEOPLE TEND NOT TO LOOK FOR THE
IGNORED,  EVEN THOUGH  THEY'RE  HIGH GROWTH.  FOR  EXAMPLE,  IF I'M WORKING AT A
SELL-SIDE  BROKERAGE  FIRM,  HOW DO I MAKE $2 MILLION A YEAR? I DON'T MAKE IT BY
BUYING AND  RECOMMENDING  SMALL-CAP  STOCKS. I DO IT BECAUSE I'M ON THE ALL-STAR
TEAM, OR I DO INVESTMENT BANKING. AND I DO THAT BY BUYING AND FOCUSING ON LARGER
COMPANIES.

      AND UNLESS THERE'S A ROAD SHOW TODAY...  THERE'S AN OLD EXPRESSION ON WALL
STREET,  "EITHER  NET IT OR FORGET  IT." TODAY,  IT'S A LITTLE  DIFFERENT,  IT'S
IPO'S. SO NOBODY'S OUT THERE TALKING ABOUT THE SMALLER CAPS...

                                    4
<PAGE>

      WHEN THE  BERLIN  WALL CAME DOWN,  THE  BUSINESS  MODEL OF MOST  COMPANIES
BECAME GLOBAL. COCA- COLA, MTV (VIACOM),  BOEING, EVERYBODY COULD GO GLOBAL. AND
THEREFORE, SCALE AND SIZE BECOME IMPORTANT IN A GLOBAL MARKETPLACE,  AND YOU CAN
CAPTURE, AT THE MARGIN, THESE GREATER GROWTH  OPPORTUNITIES.  SO WE COULD MAKE A
COMPELLING CASE THAT FROM AN EARNINGS AND MARKET  DYNAMICS POINT OF VIEW,  SCALE
IS IMPORTANT ON A GLOBAL BASIS AND SIZE IS IMPORTANT AND,  THEREFORE,  THAT'S AN
ADVANTAGE.

      BUT WE KNOW THAT WHEN YOU DO THE  RESEARCH AND FIND GREAT  COMPANIES  THAT
CAN GROW AT THE RATES  THAT WE'RE  FINDING  THEM  [SELLING  AT] 10, 11, 12 TIMES
EARNINGS,  IT'S OKAY. WE'RE EXPECTING TO CREATE WEALTH FOR THE SHAREHOLDERS THAT
BUY THE SMALL-CAP  STOCKS.  WE'RE EXPECTING TO DO IT AGAINST OUR BENCHMARK.  AND
WE'RE EXPECTING TO DO IT EXTRAORDINARILY WELL WITH LESS RISK...

      HOW MANY OF YOU WOULD BE UNHAPPY  EARNING A RETURN OF 20% A YEAR? WHAT HAS
THE STOCK MARKET DONE FOR THE LAST 60 YEARS?  WE ALL KNOW WHAT IT'S DONE FOR THE
LAST FOUR.  SO THAT'S THE WAY WE THINK ABOUT IT,  OWNING  BUSINESSES.  WE'RE NOT
BUYING SOYBEANS OR COMMODITIES,  WE'RE NOT BUYING STOCKS THAT REPRESENT  TRADING
PIECES OF PAPER...

      SOMEONE  ASKED  WHY,  IN AN  INTERNET  WORLD,  DOES  THE  PORTFOLIO  START
INCLUDING SOME GAS,  ELECTRIC AND WATER  COMPANIES?  ISN'T THAT ABOUT AS DULL AS
YOU CAN FIND?

      WELL,  WE  DECIDED  ABOUT  TWO OR THREE  YEARS  AGO THAT  THERE'S  A MAJOR
STRUCTURAL  CHANGE TAKING PLACE. AND GOING BACK TO THE MODEL OF RISK/REWARD,  WE
STARTED  BUYING  ALL THE WATER  COMPANIES.  WHY?  BECAUSE OF  CONSOLIDATION.  WE
STARTED  BUYING  GAS  COMPANIES  BECAUSE  OF THE  CONSOLIDATION  THAT WAS LED BY
EASTERN  ENTERPRISES  OUT OF BOSTON  WHERE  THERE WERE ABOUT  SEVEN OR EIGHT GAS
COMPANIES, AND THEY BOUGHT THREE OR FOUR.

      THEN WE STARTED BUYING THE [ELECTRIC  COMPANIES],  IN PART, BECAUSE OF THE
COMBINATION  OF THE  DEREGULATION  IN  THAT  INDUSTRY,  WHEN  MANUFACTURING  WAS
UNCOUPLED  FROM  DISTRIBUTION  AND UNCOUPLED FROM THE RETAIL SIDE. SO WE'VE BEEN
REWARDED BY OUR PATIENCE BECAUSE IN THE LAST THREE MONTHS ALONE, THERE HAVE BEEN
24 TRANSACTIONS . . .

      EVEN WARREN  BUFFETT WENT OUT AND JUST BOUGHT A COMPANY IN IOWA.  AND WHAT
HE SEES IS AN ABILITY TO PUT BILLIONS OF DOLLARS TO WORK AT LOW RISK. BASICALLY,
THE CEO SAID,  "HEY,  I'M GOING TO DO A WHOLE  BUNCH OF  DEALS."  JUST THIS WEEK
ALONE, YOU SAW THREE OR FOUR OF THEM. SO WE ARE INTO "TAKE OUT POWER".

      SO THAT'S WHY THOSE ARE CREEPING  INTO OUR  PORTFOLIO,  NOT BECAUSE  WE'RE
BEING CONSERVATIVE,  BUT BECAUSE WE'RE BEING EXTRAORDINARILY AGGRESSIVE WITH LOW
RISK...

      SO [I'VE SEEN] THESE EBBS AND FLOWS IN MY BRIEF  INVESTMENT  HORIZON OF 35
YEARS.  RIGHT NOW, EVERYONE IS  EXTRAORDINARILY  OPTIMISTIC,  AND DESERVEDLY SO.
HOWEVER,  AS [WE] POINTED OUT, WHAT PRICE DO YOU WANT TO PAY FOR THAT OPTIMISM?"

                                       5
<PAGE>

A component of our  investment  methodology  is to identify  industry and sector
trends and themes ahead of the curve and position ourselves to take advantage of
these  developments.  Industry  consolidation  is one  such  trend.  As we  have
discussed in previous  letters,  the continued high level of activity in mergers
and acquisitions contributed significantly to the solid performance of the Small
Cap Growth Fund. The accompanying  table  illustrates how deal activity surfaced
value in a small sample of the portfolio holdings.

- --------------------------------------------------------------------------------
                              1999 COMPLETED DEALS

<TABLE>
<CAPTION>

                                      NUMBER AVERAGE    COST CLOSING
   FUND HOLDING                        OF SHARES (a)    PER SHARE (b)    PRICE (c)     CLOSING DATE   %RETURN (d)
   ------------                       --------------    -------------    ---------      -----------   ----------
   <S>                                    <C>              <C>            <C>            <C>            <C>
   AFC Cable Systems Inc.                  40,000          $20.54         $42.69         11/22/99       107.82%
   General Housewares Corp.                55,000           13.07          28.63         10/21/99       119.02%
   Chock Full O'Nuts Corp.                 56,000            8.43          11.38         10/18/99        35.01%
   COMSAT Corp.                            35,000           32.67          45.50         09/18/99         9.80%
   Cellular Comm. of Puerto Rico           24,000            8.98          29.50         08/25/99       228.02%
   Hach Co.                                13,000           10.23          17.75         07/15/99        73.46%
   Hach Co., Cl. A                         20,000            9.86          17.25         07/15/99        74.96%
   Lawter International Inc.              200,000           11.39          12.25         06/01/99         6.99%
   Whitman Corp.                           48,000           15.43          17.94         05/20/99        16.29%
   American Safety Razor Co.               14,900           11.94          14.20         04/23/99         2.21%
   US Physical Therapy Inc.                 6,000            6.25           9.75         04/20/99        56.00%
   Hudson General Corp.                    41,000           15.71          76.00         03/19/99       382.97%
   Pulitzer Publishing Co.                 42,000           30.51          81.19         03/19/99       116.11%
   Fingerhut Companies Inc.                40,000           12.24          25.00         03/17/99       104.25%
   First Brands Corp.                      15,000           12.93          38.56         01/28/99       198.22%
   Gryphon Holdings                        20,000           16.88          19.00         01/15/99        12.56%
   CalMat Co.                             130,000           21.51          31.00         01/01/99        44.12%
- ----------------------------------------------------------------------------------------------------------------
</TABLE>
(a) Number  of  shares  held by the Fund on the  final  day of  trading  for the
    issuer.
(b) Average  purchase price of issuer's shares held by the Fund on the final day
    of trading for the issuer.
(c) Closing price on the final day of trading for the issuer or the tender price
    on the closing date of the tender offer.
(d) Represents  average  estimated  return  based on average  cost per share and
    closing price per share.

NOTE:  SEE THE PORTFOLIO OF INVESTMENTS FOR A COMPLETE LISTING OF HOLDINGS.
- --------------------------------------------------------------------------------

THIS YEAR'S SCORECARD

      As is usually the case,  this year's biggest winners come from an eclectic
group of industries  including  wireless  communications  (Rural Cellular Corp.,
VoiceStream Wireless and Aerial Communications), publishing (TV Guide and Penton
Media),  broadcasting  (Ackerley Group and Sinclair Broadcast Group),  candy and
trading  cards  (Topps  Company),  ice cream (Ben & Jerry's  Homemade)  and auto
painting (Earl Scheib).

                                       6
<PAGE>

      Our losers come from equally  disparate  industry groups  including:  golf
equipment  (Adams  Golf),  retailing  (Burlington  Coat  Factory),   auto  parts
(GenCorp), gold mining (TVX Gold) and energy (Tesoro Petroleum Corp.)

      Even in unusually narrow markets such as this year's technology  dominated
advance, there are opportunities for research driven stock pickers to excel. Our
high stock picking batting average in a market in which most of the scoring came
from technology stock home runs helped us generate very competitive returns.

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.

AZTAR CORP. (AZR - $10.875 - NYSE) has been in the gaming business for more than
20 years.  The company owns and operates three casino hotels:  Tropicana  Casino
and Resort in  Atlantic  City;  Tropicana  Resort  and Casino in Las Vegas;  and
Ramada  Express  Hotel and  Casino in  Laughlin,  Nevada.  Aztar  also  operates
riverboats in Caruthersville, Missouri and Evansville, Indiana.

CARTER-WALLACE INC. (CAR - $17.9375 - NYSE) manufactures and sells a diversified
line of consumer  health care products  including  toiletries,  pharmaceuticals,
diagnostic  specialties,  proprietary  drugs and pet supplies.  Such  recognized
brand names as Arrid deodorant, Nair hair remover and Pearl Drops toothpaste are
Carter-Wallace products.  Astelin, in its second year on the market, remains the
only prescription  antihistamine  nasal spray in the U.S. The company also sells
certain products exclusively in international markets.

CLARCOR INC. (CLC - $18.00 - NYSE)  manufactures  and distributes  engine/mobile
and  industrial/environmental  filtration products as well as consumer packaging
products.  CLARCOR markets a full line of oil, air, fuel,  coolant and hydraulic
fluid filters that are used in a wide variety of applications  including engines
and  industrial  equipment.  The company  markets  commercial and industrial air
filters  and  systems,   electrostatic   contamination  control  equipment,  and
electrostatic  high precision  spraying  equipment.  The air filters and systems
remove  contaminants from recirculated indoor air and from processed air that is
exhausted  outdoors.   Metal,   plastic,   and  paper  containers,   combination
metal/plastic  containers,  and plastic closures manufactured by the company are
used in  packaging a wide variety of dry and paste form  products,  such as food
specialties,   beverages  and  juices,  cosmetics  and  toiletries,   drugs  and
pharmaceuticals and chemical specialties.

DEXTER CORP. (DEX - $39.75 - NYSE), located in Windsor Locks, Connecticut,  is a
specialty  materials  company  principally  serving  the  worldwide   aerospace,
electronics,  food  packaging  and  medical  markets,  with  products  based  on
proprietary  technologies.  Through 75%  ownership  of Life  Technologies,  Inc.
Dexter's life sciences  segment  focuses on the  development  and manufacture of
precise,  reproducible  biological  and  biochemical  products for life sciences
research and commercial  applications  within the medical market. The non-wovens
segment focuses on the proprietary formulation and manufacture of

                                       7
<PAGE>

long-fiber,  wet-formed  products,  primarily  for  use in the  food  packaging,
medical and hygiene  markets.  The specialty  polymers  segment includes product
offerings  based on polymer  technology  for the  formulation  and processing of
specialty  adhesives,  coatings  and  encapsulants  primarily  for  use  in  the
aerospace and electronics markets,

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.

OAK TECHNOLOGY INC. (OAKT - $9.4375 - NASDAQ) designs, develops and markets high
performance  integrated  semiconductors,  software  and  platform  solutions  to
original  equipment  manufacturers  ("OEMs")  worldwide  that serve the  optical
storage,  consumer  electronics  and  digital  imaging  equipment  markets.  The
company's  products  consist  primarily of  integrated  circuits and  supporting
software and firmware, all designed to store and distribute digital content. The
company  contracts with  independent  foundries to manufacture all its products.
Currently, the company's three target markets include optical storage,  consumer
electronics and digital imaging equipment.

PITTWAY CORP.  (PRY - $45.0625 - NYSE) has  completed  the tax-free  spin-off of
Penton Media (PME - $24.00 - NYSE). Each Pittway shareholder  received one share
of Penton common stock for each share of Pittway stock held.  This action leaves
Pittway with its core business of  manufacturing  and  distributing  burglar and
commercial fire alarm equipment.  Pittway's ADI distribution unit is the largest
supplier of alarm system components in the U.S. Pittway is also involved in real
estate and other  promising  ventures,  including a 34%  interest  in Cylink,  a
leading manufacturer of encryption equipment.  Honeywell (HON - $57.6875 - NYSE)
has begun a tender offer to acquire  Pittway's 43 million  shares for $45.50 per
share.

STANDARD  MOTOR  PRODUCTS  INC.  (SMP - $16.125 - NYSE),  headquartered  in Long
Island City,  New York,  supplies  functional  replacement  parts for the engine
management,  electrical and climate control  systems of cars,  trucks and buses.
The company services all makes and models,  both new and old cars,  imported and
domestic.  SMP has two primary  divisions - engine  management  and  temperature
control - and  believes  it is the number  one  supplier  to the North  American
aftermarket in cash of these lines.


TV GUIDE INC. (TVGIA - $43.00 - NASDAQ),  formerly United Video Satellite Group,
publishes TV Guide, the  best-selling  weekly magazine in the U.S. The company's
other operations  include the TV Guide Channel (an on-screen  programming  guide
formerly called the Prevue Channel) and 40% of  Superstar/Netlink  Group,  which
sends  programming  from such  providers as CNN, ESPN, and HBO to home satellite
dishes.  Other services include SpaceCom  (satellite  transmission  services for
radio programming,

                                       8

<PAGE>
paging,  and news services) and UVTV  (distribution  of  superstations,  such as
Chicago's WGN, to cable television systems). News Corp. and AT&T's Liberty Media
Group each hold about 49% of TV Guide's voting power and 44% of its equity.

UNITED  TELEVISION  INC. (UTVI - $137.6875 - NASDAQ),  headquartered  in Beverly
Hills,  California,  is a television  broadcasting group which owns and operates
seven of the stations (one ABC, one NBC and five UPN  affiliates)  that comprise
Chris-Craft's  (CCN -  $72.125  - NYSE)  television  division.  The $60  million
purchase of WRBW, a UPN affiliate in Orlando (the country's 22nd largest and the
fastest growing television market over the past decade), closed on July 7, 1999.
UTVI stations cover approximately nine percent of the U.S.  population.  UTVI is
58%-owned by BHC Communications  (BHC - $160.00 - AMEX).  United Television is a
beneficiary of the recent FCC ruling allowing  television  duopoly, or ownership
of two stations in a market.

USA NETWORKS INC. (USAI - $55.25 - NASDAQ), through its subsidiaries, engages in
diversified media and electronic  commerce  businesses that include:  electronic
retailing,  ticketing operations and television  broadcasting.  Chairman and CEO
Barry Diller has brought  together  under one  umbrella:  the USA  Network,  the
Sci-Fi  Channel,  USA Networks  Studios,  USA  Broadcasting,  The Home  Shopping
Network and the  Ticketmaster  Group.  The plan is to  integrate  these  assets,
leveraging  programming,  production capabilities and electronic commerce across
this strong distribution platform.

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  Small Cap Growth 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].

SHAREHOLDER MEETING

      We are pleased to report that the  shareholders  of The Gabelli  Small Cap
Growth Fund overwhelmingly approved the proposal to create additional classes of
shares for the Fund.  The  creation of new classes of shares  provides  the Fund
with  distribution  alternatives  that  address  the needs of  various  types of
investors.  The  offering  of new  classes of shares  should  also  enhance  the
potential  for the Fund to attract  additional  investors in a manner that could
provide added benefits for all  shareholders  of the Fund. The existing class of
shares have been  redesignated as Class AAA shares.  Presently,  no introduction
date has been  established  for the new classes of shares.  The  offering of new
classes of shares  will not  diminish  the  ability of current  shareholders  to
purchase and redeem Class AAA shares at net asset value.

                                       9
<PAGE>

IN CONCLUSION

      A very narrow small cap market dominated by technology  stocks  challenged
our  investment  prowess in 1999.  As is  evidenced  by the  Fund's  competitive
returns versus the Russell 2000 benchmark,  we did a good job finding winners in
a broad range of  industries.  We believe a small  percentage of stocks in a few
sectors of the small cap market are grossly overvalued.  However, the balance of
the market  still  offers a wealth of  reasonably  priced  long term  investment
opportunities that we can take advantage of in the years ahead.

      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 GABSX.  Please call us during the
business day for further information.



                                                    Sincerely,

                                                    /s/ signature

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

January 31, 2000


- --------------------------------------------------------------------------------
                                TOP TEN HOLDINGS
                                DECEMBER 31, 1999
                                -----------------
               TV Guide Inc.                      UnitedGlobalCom Inc.
               Pittway Corp.                      Oak Technology Inc.
               USA Networks Inc.                  Aztar Corp.
               Liberty Corp.                      Carter-Wallace Inc.
               United Television Inc.             CLARCOR Inc.
- --------------------------------------------------------------------------------

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 SMALL CAP GROWTH FUND
PORTFOLIO OF INVESTMENTS -- DECEMBER 31, 1999 (UNAUDITED)
- --------------------------------------------------------------------------------
                                                          MARKET
    SHARES                                                VALUE
    ------                                                ------
              COMMON STOCKS -- 96.1%
              AGRICULTURE -- 0.0%
      7,500   Cadiz Inc. ...........................   $     71,250
      5,000   Sylvan Inc ...........................         42,500
                                                       ------------
                                                            113,750
                                                       ------------
              AUTOMOTIVE: PARTS AND ACCESSORIES -- 4.4%
    100,000   Acktion Co.+ .........................        900,589
      5,000   Borg-Warner Automotive Inc. ..........        202,500
    170,000   GenCorp Inc. .........................      1,678,750
      8,000   Lund International Holdings Inc.+ ....         47,000
     20,000   Meritor Automotive Inc. ..............        387,500
     10,000   Midas Inc. ...........................        218,750
    125,000   Modine Manufacturing Co. .............      3,125,000
      5,250   Monro Muffler Brake Inc.+ ............         39,375
    190,000   Scheib (Earl) Inc.+ ..................        558,125
    151,000   Standard Motor Products Inc. .........      2,434,875
     17,000   Strattec Security Corp.+ .............        550,375
     48,000   Superior Industries International Inc.      1,287,000
    125,000   TransPro Inc. ........................        804,687
    190,000   Wynn's International Inc. ............      2,683,750
                                                       ------------
                                                         14,918,276
                                                       ------------
              AVIATION: PARTS AND SERVICES -- 3.0%
     15,000   AAR Corp. ............................        269,063
     40,000   Aviall Inc.+ .........................        327,500
     10,000   Barnes Group Inc. ....................        163,125
     56,000   Curtiss-Wright Corp. .................      2,065,000
      7,500   Ducommun Inc. ........................         81,562
    120,000   Fairchild Corp., Cl. A+ ..............      1,087,500
     26,500   Hi-Shear Industries Inc. .............         61,281
    300,000   Kaman Corp., Cl. A ...................      3,862,500
     80,000   Moog Inc., Cl. A+ ....................      2,160,000
                                                       ------------
                                                         10,077,531
                                                       ------------
              BROADCASTING -- 8.0%
    195,000   Ackerley Group Inc. ..................      3,534,375
    230,000   Granite Broadcasting Corp.+ ..........      2,328,750
     35,000   Gray Communications Systems Inc. .....        619,062
     50,000   Gray Communications Systems Inc., Cl. B       675,000
     54,500   Hearst-Argyle Television Inc.+ .......      1,451,062
    167,000   Liberty Corp. ........................      7,045,312
    110,000   Paxson Communications Corp.+ .........      1,313,125
     65,000   Price Communications Corp.+ ..........      1,807,812
     35,000   Salem Communications Corp., Cl. A+ ...        791,875
      1,000   Sinclair Broadcast Group Inc.+ .......         12,203
      2,000   Spanish Broadcasting System Inc.+ ....         80,500
     50,000   United Television Inc. ...............      6,884,375



                                                          MARKET
    SHARES                                                VALUE
    ------                                                ------
      1,500   Wink Communications Inc.+ ............   $     90,094
      9,000   Young Broadcasting Inc., Cl. A+ ......        459,000
                                                       ------------
                                                         27,092,545
                                                       ------------
              BUILDING AND CONSTRUCTION -- 1.3%
     15,000   Florida Rock Industries Inc. .........        516,562
     14,444   Huttig Building Products Inc.+ .......         71,319
     94,000   Nortek Inc.+ .........................      2,632,000
     75,000   Republic Group Inc. ..................      1,134,375
      2,000   Universal Forest Products Inc. .......         29,500
                                                       ------------
                                                          4,383,756
                                                       ------------
              BUSINESS SERVICES -- 2.0%
     69,000   Berlitz International Inc.+ ..........      1,185,937
     40,000   Burns International Services Corp. ...        432,500
    610,400   Career Blazers Inc. ..................        396,760
      6,000   Carlisle Holdings Ltd.+ ..............         72,000
      1,000   Circle.com+ ..........................         12,312
     20,000   Data Broadcasting Corp.+ .............        165,000
      3,000   Data Transmission Network Corp.+ .....         51,750
     40,000   Donnelley (R.H.) Corp. ...............        755,000
     27,000   Industrial Distribution Group Inc.+ ..         87,750
     10,000   Landauer Inc. ........................        218,750
      5,000   MDC Communications Corp., Cl. A+ .....         41,875
     38,500   Nashua Corp.+ ........................        288,750
    109,500   National Processing Inc.+ ............        971,812
    105,000   Paxar Corp.+ .........................        885,937
     15,000   Pittson Brink's Group ................        330,000
     13,000   Princeton Video Image Inc.+ ..........        104,000
     10,000   PubliCard Inc.+ ......................         65,625
     87,000   Trans-Lux Corp. (b) ..................        614,437
      8,000   Wackenhut Corp., Cl. A ...............        119,500
      6,187   Wackenhut Corp., Cl. B ...............         63,803
                                                       ------------
                                                          6,863,498
                                                       ------------
              CABLE -- 2.3%
     18,000   Cablevision Systems Corp., Cl. A .....      1,359,000
     90,000   UnitedGlobalCom Inc., Cl. A+ .........      6,356,250
                                                       ------------
                                                          7,715,250
                                                       ------------
              CLOSED-END FUNDS -- 1.9%
    127,000   Baker Fentress & Co. .................      1,793,875
     45,000   Central European Equity Fund Inc. ....        649,687
     78,000   Dresdner RCM Europe Fund Inc. ........      1,234,740
     45,000   France Growth Fund Inc. ..............        689,062
     32,000   Germany Fund Inc. ....................        484,000
     40,000   Italy Fund Inc. ......................        680,000
     65,000   New Germany Fund Inc. ................        796,250
     11,000   Spain Fund Inc. ......................        153,313
                                                       ------------
                                                          6,480,927
                                                       ------------

                                       11
<PAGE>
THE GABELLI SMALL CAP GROWTH FUND
PORTFOLIO OF INVESTMENTS (CONTINUED) -- DECEMBER 31, 1999 (UNAUDITED)
- --------------------------------------------------------------------------------
                                                          MARKET
    SHARES                                                VALUE
    ------                                                ------
              COMMON STOCKS (CONTINUED)
              COMMUNICATIONS EQUIPMENT -- 0.4%
    110,000   Allen Telecom Inc.+ ..................   $  1,271,875
                                                       ------------
              COMPUTER SOFTWARE AND SERVICES-- 2.3%
      1,000   @Home Corp., Ser. A+ .................         42,875
      3,000   Anacomp Inc. .........................         54,562
     92,500   Bull Run Corp.+ ......................        543,437
      5,000   CDNow Inc.+ ..........................         49,375
      2,000   CheckFree Holdings Corp.+ ............        209,000
      3,000   Cylink Corp. .........................         40,500
     25,000   Internet.com Corp.+ ..................      1,306,250
        200   Macromedia Inc.+ .....................         14,625
     70,000   Phoenix Technologies Ltd.+ ...........      1,106,875
     30,000   QuadraMed Corp.+ .....................        261,562
     10,000   Titan Corp.+ .........................        471,250
    440,000   Tyler Technologies Inc. ..............      2,420,000
    105,000   Xionics Document Technologies Inc.+ ..      1,095,937
                                                       ------------
                                                          7,616,248
                                                       ------------
              CONSUMER PRODUCTS -- 3.9%
      3,000   Action Performance Companies Inc.+ ...         34,500
     20,000   Adams Golf Inc.+ .....................         32,500
     25,000   Ashworth Inc.+ .......................        103,125
    260,000   Carter-Wallace Inc. ..................      4,663,750
     45,000   Church & Dwight Co. Inc. .............      1,200,937
     12,000   Coachmen Industries Inc. .............        181,500
      3,000   Department 56 Inc.+ ..................         67,875
      8,000   French Fragrances Inc.+ ..............         51,500
     95,000   General Cigar Holdings Inc.+ .........        789,687
    133,500   General Cigar Holdings Inc., Cl. B+ (a)     1,109,719
     60,000   Genlyte Group Inc.+ ..................      1,282,500
      2,000   Harley-Davidson Inc. .................        128,125
    120,000   Hartmarx Corp.+ ......................        487,500
     10,000   Madden (Steven) Ltd. .................        190,625
     27,200   National Presto Industries Inc. ......        965,600
     14,000   Nature's Sunshine Products Inc. ......        112,000
      3,000   Scotts Co., Cl. A+ ...................        120,750
      8,000   Skyline Corp. ........................        188,000
     14,000   Stewart Enterprises Inc., Cl. A ......         66,500
      1,500   TiVo Inc.+ ...........................         50,625
    120,000   Weider Nutrition International Inc. ..        442,500
     70,000   Wolverine World Wide Inc. ............        765,625
                                                       ------------
                                                         13,035,443
                                                       ------------
              CONSUMER SERVICES -- 0.9%
     20,000   Bowlin Outdoor Advertising &
               Travel Centers Inc.+ ................        107,500
      1,000   Collectors Universe Inc. .............          6,250
     40,000   Loewen Group Inc. ....................         17,500
      1,000   Martha Stewart Living Inc., Cl. A+ ...         24,000


                                                          MARKET
    SHARES                                                VALUE
    ------                                                ------
      5,000   Ogden Corp ...........................   $     59,687
     10,000   Response USA Inc.+ ...................         10,312
    162,000   Rollins Inc. .........................      2,430,000
     30,000   Travel Services International Inc.+ ..        273,750
                                                       ------------
                                                          2,928,999
                                                       ------------
              DIVERSIFIED INDUSTRIAL -- 5.3%
     99,500   Ampco-Pittsburgh Corp. ...............      1,007,438
      8,000   Anixter International Inc.+ ..........        165,000
     65,000   Crane Co. ............................      1,291,875
     61,000   Gardner Denver Machinery Corp.+ ......      1,017,937
     15,000   GATX Corp. ...........................        506,250
     70,000   GenTek Inc. ..........................        730,625
     36,000   Katy Industries Inc. .................        312,750
    455,000   Lamson & Sessions Co.+ ...............      2,218,125
     75,000   Lindsay Manufacturing Co. ............      1,368,750
     60,000   MagneTek Inc. ........................        461,250
     20,000   Myers Industries Inc. ................        315,000
    610,400   Noel Group Inc.+ .....................        404,390
     40,000   Oil-Dri Corporation of America .......        575,000
    130,000   Park-Ohio Holdings Corp.+ ............      1,283,750
     20,000   Standex International Corp. ..........        418,750
    190,000   Thomas Industries Inc. ...............      3,883,125
     40,000   Tyco International Ltd. ..............      1,555,000
     60,000   WHX Corp.+ ...........................        540,000
                                                       ------------
                                                         18,055,015
                                                       ------------
              EDUCATIONAL SERVICES-- 0.0%
     22,000   Whitman Education Group Inc.+ ........         60,500
                                                       ------------
              ELECTRONICS -- 2.5%
    640,000   Oak Technology Inc.+ .................      6,040,000
     60,000   Watkins-Johnson Co. ..................      2,400,000
                                                       ------------
                                                          8,440,000
                                                       ------------
              ENERGY AND UTILITIES -- 4.5%
     35,000   AGL Resources Inc. ...................        595,000
     44,600   Aquarion Co. .........................      1,650,200
      6,000   Basin Exploration Inc.+ ..............        105,750
      3,000   Birmingham Utilities Inc. ............         71,063
     20,000   CH Energy Group Inc. .................        660,000
      2,000   Connecticut Water Service Inc. .......         64,000
     25,000   Eastern Enterprises ..................      1,435,937
     25,000   E'Town Corp. .........................      1,556,250
      5,000   Fall River Gas Co. ...................        106,250
     42,000   Florida Public Utilities Co. .........        714,000
    130,000   Kaneb Services Inc.+ .................        568,750
     15,000   Petroleum Geo-Services ASA+ ..........        267,187
    300,000   RPC Inc. .............................      1,725,000
      6,000   SJW Corp .............................        721,500
    110,000   Southwest Gas Corp. ..................      2,530,000

                                       12
<PAGE>
THE GABELLI SMALL CAP GROWTH FUND
PORTFOLIO OF INVESTMENTS (CONTINUED) -- DECEMBER 31, 1999 (UNAUDITED)
- --------------------------------------------------------------------------------
                                                          MARKET
    SHARES                                                VALUE
    ------                                                ------
              COMMON STOCKS (CONTINUED)
              ENERGY AND UTILITIES (CONTINUED)
     15,000   Tesoro Petroleum Corp. ...............   $    173,438
      5,000   TransMontaigne Oil Co. ...............         35,000
     49,000   United Water Resources Inc. ..........      1,675,188
     45,000   Waterlink Inc. .......................        112,500
     15,000   WICOR Inc. ...........................        437,813
                                                       ------------
                                                         15,204,826
                                                       ------------
              ENTERTAINMENT -- 6.8%
    105,000   Ascent Entertainment Group Inc.+ .....      1,332,188
     15,000   Dover Downs Entertainment Inc.+ ......        281,250
     45,000   Fisher Companies Inc. ................      2,778,750
     40,000   GC Companies Inc.+ ...................      1,035,000
      2,500   International Speedway Corp. .........        125,000
     10,000   Liberty Digital Inc.+ ................        742,500
      4,000   Loews Cineplex Entertainment Corp.+ ..         23,500
      3,000   Metromedia International Group Inc.+ .         14,250
     45,000   Topps Co. Inc.+ ......................        466,875
    210,000   TV Guide Inc., Cl. A+ ................      9,030,000
    130,000   USA Networks Inc.+ ...................      7,182,500
      1,000   World Wrestling Federation
               Entertainment Inc.+ .................         17,250
                                                       ------------
                                                         23,029,063
                                                       ------------
              EQUIPMENT AND SUPPLIES -- 15.4%
     14,000   Alltrista Corp.+ .....................        309,750
    145,000   AMETEK Inc. ..........................      2,764,063
     20,500   Amphenol Corp., Cl. A+ ...............      1,364,531
    320,000   Baldwin Technology Co. Inc., Cl. A+ ..        680,000
     55,000   Belden Inc. ..........................      1,155,000
      4,000   Bway Corp.+ ..........................         24,500
     17,000   C&D Technologies Inc. ................        722,500
     80,000   CIRCOR International Inc.+ ...........        825,000
    259,000   CLARCOR Inc. .........................      4,662,000
      5,000   Commercial Intertech Corp. ...........         63,750
     60,000   Core Materials Corp. .................        138,750
     25,000   CTS Corp. ............................      1,884,375
     82,000   Cuno Inc.+ ...........................      1,697,656
      9,000   Danaher Corp. ........................        434,250
    257,600   Fedders Corp. ........................      1,416,800
    102,000   Flowserve Corp. ......................      1,734,000
     54,800   Franklin Electric Co. ................      3,846,275
     40,000   General Magnaplate Corp. .............        117,500
     70,000   Gerber Scientific Inc. ...............      1,535,625
     17,775   Gorman-Rupp Co. ......................        311,063
     17,000   Graco Inc. ...........................        609,875
    145,000   Hussmann International Inc. ..........      2,184,063
     47,000   IDEX Corp. ...........................      1,427,625
     32,000   Johnston Industries Inc. .............         54,000
    113,000   Kollmorgen Corp. .....................      1,391,313



                                                          MARKET
    SHARES                                                VALUE
    ------                                                ------
     10,000   K-Tron International Inc.+ ...........   $    135,000
     10,000   Littelfuse Inc.+ .....................        242,656
     22,000   Lufkin Industries Inc. ...............        330,000
    100,000   Mark IV Industries Inc. ..............      1,768,750
     22,000   Met-Pro Corp. ........................        220,000
    160,000   Pittway Corp. ........................      7,210,000
      2,000   Plantronics Inc.+ ....................        143,125
     26,000   Raytech Corp.+ .......................         87,750
     10,000   Robbins & Myers Inc. .................        226,250
     29,000   Roper Industries Inc. ................      1,096,563
      3,500   Sames Corp. ..........................         54,031
     40,000   Sequa Corp., Cl. A+ ..................      2,157,500
     13,500   Sequa Corp., Cl. B+ ..................        810,000
     56,000   SL Industries Inc. ...................        651,000
      1,000   Smith (A.O.) Corp. ...................         21,875
      9,000   Smith (A.O.) Corp., Cl. A ............        191,250
     74,000   SPS Technologies Inc.+ ...............      2,363,375
      5,000   Teleflex Inc. ........................        156,563
     15,000   Tennant Co. ..........................        491,250
      5,000   Valmont Industries Inc. ..............         80,313
      7,875   Watsco Inc., Cl. B ...................         91,301
    145,000   Watts Industries Inc., Cl. A .........      2,138,750
                                                       ------------
                                                         52,021,566
                                                       ------------
              FINANCIAL SERVICES-- 2.6%
     30,000   Argonaut Group Inc. ..................        596,250
     68,000   Berliner Bank Aktiengesellschaft .....      1,130,135
     45,000   Danielson Holding Corp.+ .............        258,750
      3,000   Federal Agricultural Mortgage Corp., Cl. C+    60,563
     45,000   Gainsco Inc. .........................        241,875
     18,000   Hibernia Corp., Cl. A ................        191,250
      3,000   LandAmerica Financial Group ..........         55,125
     15,000   Metris Companies Inc. ................        535,313
    103,500   Midland Co. ..........................      2,147,625
      1,500   Net.B@nk Inc.+ .......................         27,750
    230,000   Pioneer Group Inc.+ ..................      3,622,500
                                                       ------------
                                                          8,867,136
                                                       ------------
              FOOD AND BEVERAGE -- 2.9%
     12,000   Advantica Restaurant Group Inc.+ .....         21,000
     20,000   Ben & Jerry's Homemade Inc., Cl. A+ ..        497,500
     34,863   Buenos Aires Embotelladora SA (a) ....              0
    216,000   Celestial Seasonings Inc.+ ...........      4,019,625
      6,000   Cheesecake Factory Inc.+ .............        210,000
      1,500   Farmer Brothers Co. ..................        238,500
     20,000   Genesse Corp., Cl. B .................        426,250
     10,000   International Multifoods Corp. .......        132,500
     15,000   J & J Snack Foods Corp.+ .............        307,500
      8,000   Midwest Grain Products Inc. ..........         59,000

                                       13
<PAGE>
THE GABELLI SMALL CAP GROWTH FUND
PORTFOLIO OF INVESTMENTS (CONTINUED) -- DECEMBER 31, 1999 (UNAUDITED)
- --------------------------------------------------------------------------------
                                                          MARKET
    SHARES                                                VALUE
    ------                                                ------
              COMMON STOCKS (CONTINUED)
              FOOD AND BEVERAGE (CONTINUED)
      2,000   Mondavi (Robert) Corp.+ ..............   $     69,500
      1,000   Northland Cranberries Inc., Cl. A ....          6,000
      2,000   Omni Nutraceuticals Inc ..............          2,250
    130,000   PepsiAmericas Inc.+ ..................        487,500
     40,000   Ralcorp Holdings Inc.+ ...............        797,500
     31,658   Tootsie Roll Industries Inc. .........      1,042,735
    100,000   Twinlab Corp.+ .......................        793,750
     48,000   Whitman Corp. ........................        645,000
                                                       ------------
                                                          9,756,110
                                                       ------------
              HEALTH CARE -- 2.6%
     95,000   Inamed Corp.+ ........................      4,168,125
    120,000   IVAX Corp.+ ..........................      3,090,000
     17,000   Life Technologies Inc. ...............        724,625
     48,000   Penwest Pharmaceuticals Co. ..........        732,000
      3,620   U.S. Physical Therapy Inc.+ ..........         30,770
     20,000   Women First HealthCare Inc.+ .........        105,000
                                                       ------------
                                                          8,850,520
                                                       ------------
              HOME FURNISHINGS -- 0.8%
      7,000   Bassett Furniture Industries Inc. ....        112,000
      2,000   Bed Bath & Beyond Inc.+ ..............         69,500
     17,000   Foamex International Inc. ............        141,313
     30,000   La-Z-Boy Chair Co. ...................        504,375
     50,000   Mikasa Inc. ..........................        503,125
     70,000   Oneida Ltd. ..........................      1,522,500
                                                       ------------
                                                          2,852,813
                                                       ------------
              HOTELS AND GAMING -- 4.2%
    440,000   Aztar Corp.+ .........................      4,785,000
    115,000   Boca Resorts Inc., Cl. A+ ............      1,121,250
     15,000   Boyd Gaming Corp.+ ...................         87,188
     20,000   Churchill Downs Inc. .................        451,250
     55,000   Extended Stay America Inc.+ ..........        419,375
     94,000   Gaylord Entertainment Co. ............      2,814,125
    135,000   Jackpot Enterprises Inc.+ ............      1,122,188
      5,000   Jurys Hotel Group plc ................         37,016
     30,000   Lakes Gaming Inc.+ ...................        238,125
     80,000   Mirage Resorts Inc.+ .................      1,225,000
     95,000   Park Place Entertainment Corp.+ ......      1,187,500
     25,000   Penn National Gaming Inc.+ ...........        225,000
      2,000   Station Casinos Inc.+ ................         44,875
     90,000   Trump Hotels & Casino Resorts Inc.+ ..        303,750
                                                       ------------
                                                         14,061,642
                                                       ------------
              METALS AND MINING -- 0.5%
    250,000   Echo Bay Mines Ltd.+ .................        296,875
    190,000   Royal Oak Mines Inc.+ ................          7,897
     28,000   Stillwater Mining Co.+ ...............        892,500



                                                          MARKET
    SHARES                                                VALUE
    ------                                                ------
      5,000   Toreador Royalty Corp.+ ..............   $     21,875
    545,000   TVX Gold Inc.+ .......................        442,813
                                                       ------------
                                                          1,661,960
                                                       ------------
              PAPER AND FOREST PRODUCTS -- 1.2%
    133,000   Greif Bros. Corp., Cl. A .............      3,956,750
                                                       ------------
              PUBLISHING -- 4.4%
    121,278   Independent News & Media plc .........        795,244
      2,000   Lee Enterprises Inc. .................         63,875
     40,000   McClatchy Newspapers Inc., Cl. A .....      1,730,000
     60,000   Media General Inc., Cl. A ............      3,120,000
     23,000   Meredith Corp. .......................        958,813
    185,000   Penton Media Inc. ....................      4,440,000
     45,000   Pulitzer Inc. ........................      1,814,063
    200,000   Thomas Nelson Inc. ...................      1,850,000
     12,000   Wiley (John) & Sons Inc., Cl. B ......        199,500
                                                       ------------
                                                         14,971,495
                                                       ------------
              REAL ESTATE -- 1.0%
    150,000   Catellus Development Corp.+ ..........      1,921,875
    118,000   Griffin Land & Nurseries Inc.+ .......      1,357,000
      9,000   Gyrodyne Company of America Inc.+ ....        183,656
                                                       ------------
                                                          3,462,531
                                                       ------------
              RETAIL -- 3.2%
     60,000   Aaron Rents Inc. .....................      1,065,000
     46,000   Aaron Rents Inc., Cl. A ..............        839,500
      5,000   Borders Group Inc.+ ..................         80,313
    105,000   Burlington Coat Factory Warehouse Corp.     1,456,875
     25,000   Coldwater Creek Inc.+ ................        512,500
      8,000   Gerald Stevens Inc.+ .................         67,000
    120,000   Ingles Markets Inc., Cl. A ...........      1,335,000
    210,000   Lillian Vernon Corp. .................      2,336,250
     95,000   Neiman Marcus Group Inc.+ ............      2,654,063
    120,000   Sports Authority Inc.+ ...............        240,000
      2,000   Weis Markets Inc. ....................         87,000
                                                       ------------
                                                         10,673,501
                                                       ------------
              SATELLITE -- 0.4%
      5,000   Pegasus Communications Corp.+ ........        488,750
     60,000   TCI Satellite Entertainment ..........        960,000
                                                       ------------
                                                          1,448,750
                                                       ------------
              SPECIALTY CHEMICALS -- 2.2%
     31,000   Airgas Inc. ..........................        294,500
     30,000   Bush Boake Allen Inc.+ ...............        736,875
     38,000   Dexter Corp. .........................      1,510,500
    105,000   Ferro Corp. ..........................      2,310,000
     70,000   General Chemical Group Inc. ..........        161,875
        600   MacDermid Inc. .......................         24,638

                                       14
<PAGE>
THE GABELLI SMALL CAP GROWTH FUND
PORTFOLIO OF INVESTMENTS (CONTINUED) -- DECEMBER 31, 1999 (UNAUDITED)
- --------------------------------------------------------------------------------
                                                          MARKET
    SHARES                                                VALUE
    ------                                                ------
              COMMON STOCKS (CONTINUED)
              SPECIALTY CHEMICALS  (CONTINUED)
    115,000   Material Sciences Corp.+ .............   $  1,171,563
     68,000   Omnova Solutions Inc. ................        527,000
     32,000   Penford Corp .........................        552,000
     11,000   Sybron Chemicals Inc.+ ...............        129,250
                                                       ------------
                                                          7,418,201
                                                       ------------
              TELECOMMUNICATIONS -- 2.8%
     23,000   ARC International Corp. ..............         17,250
      9,200   Atlantic Tele-Network Inc. ...........         84,525
     81,660   Citizens Utilities Co., Cl. B ........      1,158,551
     47,300   Commonwealth Telephone Enterprises Inc.+    2,500,988
     20,000   Commonwealth Telephone
               Enterprises Inc., Cl. B+ ............      1,265,000
    100,000   Communications Systems Inc. ..........      1,300,000
     65,000   GST Telecommunications Inc.+ .........        589,063
     10,000   RCN Corp.+ ...........................        485,000
     40,000   Rogers Communications Inc., Cl. B, ADR+       990,000
     20,000   Viatel Inc.+ .........................      1,072,500
                                                       ------------
                                                          9,462,877
                                                       ------------
              TRANSPORTATION -- 0.0%
      2,000   Irish Continental Group plc ..........         20,498
     50,000   OMI Corp. ............................        103,125
                                                       ------------
                                                            123,623
                                                       ------------
              WIRELESS COMMUNICATIONS -- 2.4%
     50,000   Aerial Communications Inc.+ ..........      3,043,750
      8,000   Associated Group Inc., Cl. A+ ........        730,000
      1,000   Centennial Cellular Corp., Cl. A+ ....         82,875
     40,000   CommNet Cellular Inc.+ ...............      1,285,000
     33,000   Corecomm Ltd.+ .......................      1,959,375
      2,000   Rural Cellular Corp., Cl. A+ .........        181,000
      8,000   Teligent Inc., Cl. A .................        494,000
        100   Tritel Inc., Cl. A+ ..................          3,169
      1,000   VoiceStream Wireless Corp., Cl. A+ ...        142,313
      1,000   Western Wireless Corp., Cl. A+ .......         66,750
                                                       ------------
                                                          7,988,232
                                                       ------------
              TOTAL COMMON STOCKS ..................    324,865,209
                                                       ------------



                                                          MARKET
    SHARES                                                VALUE
    ------                                                ------
              PREFERRED STOCKS -- 0.4%
              DIVERSIFIED INDUSTRIAL -- 0.4%
      5,000   WHX Corp.,
               6.50% Cv. Pfd., Ser. A ..............   $    162,187
     47,000   WHX Corp.,
               $3.75 Cv. Pfd., Ser. B ..............      1,213,188
                                                       ------------
              TOTAL PREFERRED STOCKS ...............      1,375,375
                                                       ------------
   PRINCIPAL
    AMOUNT
    ------

              CONVERTIBLE BONDS -- 0.0%
              COMPUTER SOFTWARE AND SERVICES -- 0.0%
$       500   MSC.Software Corp.
               Sub. Deb. Cv.
               7.88%, 08/18/04 .....................            435
                                                       ------------

              U.S. GOVERNMENT OBLIGATIONS -- 3.6%
 12,422,000   U.S. Treasury Bills,
               5.08% to 5.49%++,
               due 01/13/00 to 03/23/00 ............     12,309,815
                                                       ------------
              TOTAL
                INVESTMENTS -- 100.1%
                (Cost $247,670,096) ................    338,550,834

              OTHER ASSETS AND
                LIABILITIES (NET) -- (0.1)% ........       (362,366)
                                                       ------------
              NET ASSETS  -- 100.0%
                (15,781,727 shares outstanding) ....   $338,188,468
                                                       ============
              NET ASSET VALUE,
                OFFERING AND REDEMPTION
                PRICE PER SHARE ....................         $21.43
                                                             ======
- ------------------------
(a)   Security  fair  valued  under  procedures  established  by  the  Board  of
      Directors.
(b)   Security  considered an affiliated  holding because the Fund owns at least
      5% of the outstanding shares.
+     Non-income producing security.
++    Represents annualized yield at the date of purchase.
ADR - American Depositary Receipt.

                                       15
<PAGE>
                        Gabelli Equity Series Funds, Inc.
                        THE GABELLI SMALL CAP GROWTH FUND
                              One Corporate Center
                            Rye, New York 10580-1434
                                  1-800-GABELLI
                                [1-800-422-3554]
                               FAX: 1-914-921-5118
                             HTTP://WWW.GABELLI.COM
                            E-MAIL: [email protected]
                     (Net Asset Value may be obtained daily
                    by calling 1-800-GABELLI after 6:00 P.M.)

                               BOARD OF DIRECTORS

Mario J. Gabelli, CFA                   Robert J. Morrissey
CHAIRMAN AND CHIEF                      ATTORNEY-AT-LAW
INVESTMENT OFFICER                      MORRISSEY, HAWKINS & LYNCH
GABELLI ASSET MANAGEMENT INC.

Felix J. Christiana                     Karl Otto Pohl
FORMER SENIOR VICE PRESIDENT            FORMER PRESIDENT
DOLLAR DRY DOCK SAVINGS BANK            DEUTSCHE BUNDESBANK

Anthony J. Colavita                     Anthony R. Pustorino
ATTORNEY-AT-LAW                         CERTIFIED PUBLIC ACCOUNTANT
ANTHONY J. COLAVITA, P.C.               PROFESSOR, PACE UNIVERSITY

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

John D. Gabelli
SENIOR VICE PRESIDENT
GABELLI & COMPANY, INC.



                                    OFFICERS

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

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

GAB443Q499SR

                                                [PHOTO OF MARIO GABELLI OMITTED]

THE
GABELLI
SMALL CAP
GROWTH
FUND

                                                            FIRST QUARTER REPORT
                                                               DECEMBER 31, 1999


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