GABELLI GLOBAL SERIES FUNDS INC
N-30B-2, 2000-12-06
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                           [GRAPHIC OF FLAGS OMITTED]

GABELLI GLOBAL OPPORTUNITY FUND

THIRD QUARTER REPORT
SEPTEMBER 30, 2000

                             [PHOTO OF MARC J. GABELLI AND CAESAR BRYAN OMITTED]

                                                MARC J. GABELLI AND CAESAR BRYAN
                                                        Team Portfolio Managers

TO OUR SHAREHOLDERS,

      In the  third  quarter  of 2000,  the  roller-coaster  ride that is global
investing  remained a tricky  endeavor.  Europe and Asia suffered  losses as the
Euro fell and oil prices rose. The U.S. market continued its up and down journey
through the first year of the new millennium.  While the future remains unclear,
all is certainly not lost and the ride is not over yet.

INVESTMENT PERFORMANCE

      For the third  quarter  ended  September  30,  2000,  The  Gabelli  Global
Opportunity  Fund (the "Fund") Class AAA Shares' net asset value declined 3.10%.
The Morgan  Stanley  Capital  International  World  Free Index of global  equity
markets and Lipper Global Fund Average  declined 5.42% and 3.11%,  respectively,
over the same  period.  The Morgan  Stanley  World  Free  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 32.68% over the trailing  twelve-month  period.  The Morgan  Stanley
World  Free  Index and  Lipper  Global  Fund  Average  rose  8.01%  and  18.75%,
respectively, over the same twelve-month period.

      Since inception on May 11, 1998 through September 30, 2000, the Fund had a
cumulative  total  return of 88.43%,  which  equates to an average  annual total
return of 30.29%.

MULTI-CLASS SHARES

      The Gabelli Global Series Funds, Inc. began offering additional classes of
Fund shares in March 2000.  The  existing  shares  remain  no-load and have been
redesignated  as "Class  AAA"  Shares.  Class A,  Class B and Class C Shares are
targeted  to  the  needs  of  investors  who  seek  advice   through   financial
consultants.  For the third quarter ended September 30, 2000, the Gabelli Global
Opportunity
                                     <PAGE>
<TABLE>
<CAPTION>
INVESTMENT RESULTS (CLASS AAA SHARES) (a)
-------------------------------------------------------------------------------------------------------------
                                                                    Quarter
                                                   -----------------------------------------
                                                    1st         2nd         3rd         4th          Year
                                                    ---         ---         ---         ---          ----
  <S>                                              <C>        <C>         <C>          <C>          <C>
  2000:   Net Asset Value .....................    $19.07     $17.77      $17.22         --           --
          Total Return ........................      5.8%      (6.8)%      (3.1)%        --           --
--------------------------------------------------------------------------------------------------------------
  1999:   Net Asset Value .....................    $11.47     $13.00      $13.61       $18.03       $18.03
          Total Return ........................      8.7%      13.3%        4.7%        38.9%        79.2%
--------------------------------------------------------------------------------------------------------------
  1998:   Net Asset Value .....................       --      $10.23       $9.69       $10.55       $10.55
          Total Return ........................       --        2.3%(b)    (5.3)%       13.7%        10.1%(b)
-------------------------------------------------------------------------------------------------------------
</TABLE>



  -------------------------------------------------------
            Average Annual Returns (Class AAA Shares)
            -----------------------------------------
                    September 30, 2000 (a)
                    ----------------------
  1 Year ...................................     32.68%
  Life of Fund (b) .........................     30.26%
  -------------------------------------------------------

                      Dividend History
----------------------------------------------------------
Payment (ex) Date   Rate Per Share     Reinvestment  Price
-----------------   --------------     -------------------
December 27, 1999      $0.850               $17.48
December 28, 1998      $0.450               $10.34

(a) Total returns and average annual returns for Class AAAShares 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  11,  1998.  Note:  Investing  in  foreign  securities  involves  risks  not
ordinarily  associated with investments in domestic issues,  including  currency
fluctuation, economic and political risks.
--------------------------------------------------------------------------------

Fund Class A and Class B Shares  declined by 3.10%  (excluding the effect of the
5.75%  front-end  sales charge on the Class A Shares).  (Class C Shares have not
been issued as of September 30, 2000). The Class A and Class B Shares both ended
the second quarter with net asset values of $17.22.

GLOBAL ALLOCATION

      The accompanying  chart presents the Fund's holdings by geographic  region
as of September 30, 2000. The geographic allocation will change based on current
global market conditions.  Countries and/or regions represented in the chart and
below may or may not be included in the Fund's future portfolio.



                     HOLDINGS BY GEOGRAPHIC REGION - 9/30/00

                               [PIE CHART OMITTED]

EDGAR REPRESENTATION OF DATA POINTS AS FOLLOWS:

EUROPE 35.1%
UNITED STATES 28.0%
CASH 18.0%
JAPAN 13.2%
ASIA/PACIFIC RIM 3.3%
CANADA 2.0%
LATIN AMERICA 0.4%



COMMENTARY

      Equity  market  participants  are always on the lookout for things to fret
about, and recently they have not been disappointed.  The persistent weakness of
the Euro has been a major  disappointment  for international  investors.  If the
strengthening  of  the  dollar  had  occurred  a few  years  ago,  prior  to the
introduction  of the Euro,  it would  probably  not have caused such  widespread
consternation. The

                                        2

                                     <PAGE>

weakness of the Euro is thought to be the result of  significant  capital  flows
out of the Euro zone and into the U.S.  This  reflects  the  desire of Euro zone
companies to acquire U.S. assets. Needless to say, when it rains it pours. Every
mistake by European  Central  Bank  representatives  has been seized upon by the
market, and thus has driven the Euro even lower.

      Investors  have also been  unnerved  by the  increase in the price of oil.
Tensions in the Middle East and a damaged U.S.  destroyer add to the feelings of
uncertainty.  Interestingly,  in an era of less  government  intervention  and a
laissez-faire attitude towards markets, both the Euro and the oil price were the
subject of government intervention. On September 22, all the major central banks
intervened to support the Euro,  and its price rose to $0.90 against the dollar.
However, since then the Euro has fallen to a new low relative to the dollar. The
President,  by Executive Order, also announced the sale of part of the Strategic
Oil Reserve. This was done to prevent a shortage of heating oil this winter, but
the move was not successful in lowering crude oil prices.

      Aside from the price of oil and the sinking Euro,  some signs of financial
stress have surfaced.  The  difference  between  government  bond yields and the
yield on lower quality  corporate  bonds,  as well as emerging market debt, have
widened  considerably.  Furthermore,  some  emerging  market stock  indices have
almost  fallen to levels last seen during the  Russian  debt crisis of 1998.  Is
there a silver  lining to these storm clouds?  We believe there is. First,  bond
yields are falling, which suggests that the world economy is slowing. Indeed, if
the  economy  is in fact  slowing,  we are  closer to a point  where  short-term
interest rates can be reduced.  Second, although we do not know how low the Euro
can  fall,  we  expect  the  currency  to  recover  reflected  by good  economic
fundamentals  in  Europe.  And  lastly,  while  both  Europe and Japan have been
adversely impacted by higher energy costs, we have probably seen the high in oil
prices.

      The  pace of  consolidation  has not  slowed  and  corporate  mergers  and
acquisitions  activity  is  expected to remain at high  levels.  Also,  economic
reform  continues  with the  French,  German and Italian  governments  proposing
significant  tax reform  packages.  Looking  ahead,  the weak Euro has  improved
Europe's competitive position and we expect reasonable corporate earnings growth
during 2001.

      We believe that the Japanese economy is in recovery mode. Higher corporate
profitability has led to increased capital spending,  which in turn is beginning
to feed through to better  consumer  confidence.  Japan appears to be recovering
from its lost decade.  This year,  non-financial  corporate  profits will exceed
financial  corporate profits for the first time since 1989. The Nikkei peaked at
40,000 in December 1989,  compared to the current level of around  15,000.  Some
multiple  contraction!  Our optimism for Japan is largely  based on the positive
outlook for  corporate  earnings.  Although the Bank of Japan has  abandoned its
zero interest rate policy, Japanese interest rates still remain low.

TMT

      Technology,   media,  and   telecommunications   ("TMT")  stocks  produced
exceptional returns in 1997-99. This year, media and  telecommunications  stocks
languished.  This is partially the result of good old-fashioned profit taking in
stocks that had  delivered  spectacular  returns  and  momentum  investors  were
dumping.

                                        3

                                     <PAGE>

      However, there are other factors that have temporarily soured investors on
media and telecommunication stocks.  Consolidation has slowed as regulators here
and abroad are redefining "competitive" standards.  European regulators rejected
Time Warner's  proposed  acquisition of European  recorded music powerhouse EMI.
The  WorldCom/Sprint  merger was  derailed by U.S.  regulators.  U.S.  antitrust
authorities  are taking a hard look at the Time Warner/AOL  deal.  These actions
have put potential international  telecommunications  acquirers such as Deutsche
Telecom  temporarily on hold.  Smaller deals without antitrust  implications are
being  completed.  However,  these  smaller  deals do not  generate  the kind of
headlines that  captivate  investors.  Is this the start of a global  regulatory
backlash?  We do not think so.  Consolidation in these industries makes economic
sense in a truly global marketplace.

      The constricted capital markets are also causing  disruption.  As a result
of the "dot.com" stock  massacre,  the new issue market appears to be closed for
the season  and  venture  capital  firms have  pulled in their  horns.  Internet
start-ups  are not the only  companies  being  hurt.  Promising  young media and
telecommunications  companies  are just not going to be able to survive  without
being able to tap the  equity or venture  capital  markets  for cash  infusions.
These  cash-burn  casualties  will be absorbed by larger entities at rock-bottom
prices,  indiscriminately  depressing asset values for more worthy  competitors.
For example,  Time Warner Telecom scooped up bankrupt competitive local exchange
carrier  ("CLEC")  GST   Telecommunications   at  a  fire  sale  price.  Shortly
thereafter, virtually every CLEC stock got shelled.

      Media and  telecommunications  companies do face serious challenges in the
years ahead.  Not all will be up to the task.  The  Internet is the  competitive
tool  of the  future,  but  not  all  media  companies  will  make a  successful
transition into the online world.  This will be a particularly  tough hurdle for
print  media  companies  without  a  well-planned  Internet  strategy.  The long
distance telephony market is besieged by cutthroat competition and pricing. This
will likely  continue  for the  foreseeable  future as margins and  earnings are
sacrificed on the altar of market share.  Technology will bring new entrants and
established   companies  will  have  to  fight   vigorously  to  preserve  their
franchises.

      All   things   considered,   how  do  we  feel   about   the   media   and
telecommunications  stocks  that have  rewarded us so  generously  over the past
several years,  but performed so poorly in 2000?  Just fine thank you. There are
going to be winners and losers in these rapidly  changing  industries.  Risk and
reward always go hand in hand. Going forward, stock selection remains the key to
making  money in these  dynamic  industries.  The  silver  lining  in the  cloud
overhanging  the  media and  telecommunications  groups is that we now have more
value oriented  opportunities  to choose from. We believe if we do our analysis,
we can identify many of the companies  that will prosper while  avoiding most of
those that will fail.  A solid stock  picking  batting  average in these  groups
should produce attractive long-term returns.

A MEDIA BASTILLE DAY?

      In recent years,  regulatory  barricades  in the media  industry have been
coming down. Television and radio station  cross-ownership  barriers have fallen
and broadcast companies have been allowed to substantially expand their national
footprints. But, there are still walls preventing media companies from realizing
their full  potential.  Media  companies  are not  permitted  to own  television
stations and newspapers in the same market.  Broadcasters  and cable  television
companies  still have  onerous  and  unnecessary  restrictions  on the number of
customers they can service. We believe as the Internet Age

                                        4

                                     <PAGE>

unfolds--making   information  and  entertainment   instantly  available  to  an
increasing percentage of the American public--media  companies will be liberated
from largely unnecessary restrictions. Federal Communications Commission ("FCC")
Chairman  William  Kennard is  retiring  after the  election.  The new FCC boss,
whether a Democrat or a Republican, may promote more market oriented regulation.
Eventually,  common sense and economic  realities will rise above politics,  and
media  companies  will  be  unshackled.  Our  portfolio  is well  positioned  to
celebrate  a  Bastille  Day  for the  media  industry.  Content  will  again  be
King--just as Cash is again King.

SPECTRUM

      America  is well  behind  the  rest of the  developed  world  in  building
state-of-the-art wireless communications systems. One of the reasons is that the
FCC has kept  tight  control  over the  transmission  spectrum  needed  to fully
develop  wireless  networks.  Broadcasters  have been allocated  large chunks of
spectrum  to be used to deliver  high  definition  television  ("HDTV").  It now
appears that the demand for HDTV will fall well short of previous  expectations.
Currently,  there is a debate over whether the FCC should retake control of this
spectrum  or allow  broadcasters  to sell it on the open  market.  We think  the
latter option makes more sense. This is a win/win situation.  Broadcasters could
make a bundle by auctioning off spectrum and wireless  communications  companies
would be able to  acquire  the  spectrum  they  need to  further  develop  their
systems.

INVESTMENT SCOREBOARD

      The Fund's  holdings  in the  financial  services  industry,  namely  J.P.
Morgan, Mellon Financial,  Bank of Ireland, and Merrill Lynch, strongly enhanced
the  performance  of the  Fund due to the high  level  of  acquisitions  in that
industry.  Also, some foreign stocks in the communications  equipment  industry,
such as Furukawa Electric and Marconi plc, boosted the Fund's performance.

      The  telecommunications  industry  lagged  in the third  quarter,  and our
positions in Olivetti, AT&T Corp., and DDI Corp. negatively impacted the Fund.

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.  The share  prices of the  following  holdings  are stated in U.S.  dollar
equivalent terms as of September 30, 2000.

ALLIANZ AG (ALVG.F - $330.47 - FRANKFURT STOCK EXCHANGE) provides many insurance
and  reinsurance  products  including  property,   casualty,   life  and  health
insurance. Allianz operates in over fifty countries through its subsidiaries and
affiliates.  The  company  owns  brands  such as AGF in France and RAS is Italy.
Allianz controls  significant stakes in a number of leading financial  companies
in  Germany  and  should be at the  center  of the  expected  reorganization  of
corporate  Germany,  following the  implementation  of the recently  enacted tax
reform  package  which  eliminates  corporate  capital  gains  taxes among other
changes.

                                        5

                                     <PAGE>

AT&T CORP. (T - $29.375 - NYSE) provides  voice,  data and video  communications
services to large and small  businesses,  as well as  consumers  and  government
entities.  AT&T and its  subsidiaries  furnish domestic and  international  long
distance, regional, local and wireless communications services, cable television
and Internet  communications  services.  Recently, the company announced that it
would split into four separate companies. After the restructuring, AT&T Wireless
will be converted  from a tracking stock to an  independent  common stock.  AT&T
Broadband,  which includes cable, will have an initial public offering (IPO) for
a tracking  stock,  and within 12 months of the IPO the  tracking  stock will be
converted into common stock.  AT&T Consumer will become a new consumer  tracking
stock that will  mirror  the  performance  of the  companies'  residential  long
distance and WorldNet  Internet access business.  AT&T's principal unit would be
AT&T Business, and shareholders would ultimately own all four.

CABLE & WIRELESS PLC (CWP - $42.5625 - NYSE) is a United Kingdom-based  provider
of global  telecommunications  network  services.  Its key assets  include:  (1)
ownership  in leading  voice,  data & ISP  networks  in the U.K.  and U.S.;  (2)
numerous stakes in undersea  telecom  network routes;  and (3) a strong regional
presence in Asia/Pacific,  Europe and the Caribbean/Latin America. Sale of Cable
& Wireless HKT plc to Pacific Century Cyberworks (PCW - $11.00 - NYSE) closed on
August  17,  2000.  As a result  of this  transaction,  CWP  holds a  meaningful
position in PCW.

COMPAGNIE FINANCIERE RICHEMONT AG (RIFZ.S - $3005.60 - ZURICH STOCK EXCHANGE) is
one of the  world's  leading  luxury  goods  companies  with brand names such as
Cartier, Piaget,  Montblanc, Karl Lagerfeld and Alfred Dunhill. The company also
has a major investment in tobacco with its significant investment in B.A.T., the
world's second largest tobacco  company.  Adjusted for its stake in B.A.T.,  the
market values its wholly owned luxury goods  business at a significant  discount
to other luxury goods producers.

DDI  CORP.  (9433.T -  $6570.43  - TOKYO  STOCK  EXCHANGE)  is a major  Japanese
telecommunications  company created in 1985 to compete against the NTT monopoly.
DDI recently closed the transaction that combined DDI with KDD and IDO to create
KDDI.  KDDI  offers   fixed-line  and  cellular  service   internationally   and
domestically.  KDDI has  approximately  fourteen million  cellular  subscribers,
which  represents  roughly  eleven  percent  of  the  Japanese  population.  The
company's  largest  shareholders  are Kyocera,  who holds  greater than 15%, and
Toyota, who holds greater than 13%.

FURUKAWA ELECTRIC CO. LTD. (5801.T - $27.62 - TOKYO STOCK EXCHANGE) manufactures
electric wire and cable,  light metals, and fiber optic cables. The company also
provides  related  services,  including  installation.   Furukawa  is  currently
expanding into superconductor wire and optical transmission, network systems and
devices.  The company has a significant stake in JDS Uniphase (JDSU - $94.6875 -
Nasdaq), an optical equipment manufacturer.

LIBERTY  MEDIA GROUP (LMG'A - $18.00 - NYSE),  run by savvy media  investor John
Malone, is engaged in businesses that provide  programming  services  (including
production,  acquisition and distribution  through all media formats) as well as
businesses engaged in electronic retailing, direct marketing and other services.
LMG holds interests in globally branded entertainment networks such as Discovery
Channel,  USA Network,  QVC, Encore and STARZ!.  Liberty's  investment portfolio
also  includes  interests  in  international   video  distribution   businesses,
international  telephony and domestic  wireless  companies,  plant and equipment
manufacturers, and other businesses related to broadband services. Liberty Media
Group Class A and Class B common stock are tracking stocks of AT&T.

                                        6

                                     <PAGE>

MELLON  FINANCIAL  CORP.  (MEL -  $46.375  - NYSE) is one of the  largest  asset
managers in the  country.  In addition to the Bank's  traditional  Mellon  brand
asset gathering arm, their Dreyfus, Founders and Boston Company subsidiaries are
showing  improvement.  New management  has shed non-core  assets to focus on the
company's highest margin and best growth opportunities.  Fees represent over 60%
of  revenues  and that  number will grow as the year  progresses.  Assets  under
management  now  exceed  $500  billion,  which  creates  an  enviable  stream of
recurring fee revenue.

VERIZON  COMMUNICATIONS  (VZ - $48.4375 - NYSE) was formed by the merger of Bell
Atlantic  and GTE,  and a  combination  of the  wireless  assets of the combined
company with U.S.  assets of Vodafone Group plc (VOD - $37.00 - NYSE). VZ is one
of the world's leading providers of high-growth communications services. Verizon
companies are the largest  providers of wireline and wireless  communications in
the  United  States,  with 95 million  access  line  equivalents  and 25 million
wireless  customers.  Verizon is also the world's largest  provider of print and
on-line directory information. Verizon's global presence extends to 40 countries
in the Americas, Europe, Asia and the Pacific.

VOICESTREAM  WIRELESS CORP.  (VSTR - $116.0625 - NASDAQ) is one of the remaining
two U.S.  independent  national  wireless  service  providers  with PCS licenses
covering over 220 million people. VSTR was spun-off of Western Wireless about 18
months ago and is the only national  carrier  utilizing  GSM (Global  System for
Mobile Communication)  technology, a dominant standard in Europe. VSTR is in the
process of being  acquired  by Deutsche  Telecom (DT - $34.25 - NYSE),  a former
German phone  monopoly,  for 3.2 DT shares plus $30 in cash per VSTR share.  The
merger is pending  regulatory  approval  and is  expected  to close in 2001.  DT
ownership will provide VSTR with significant financial resources and allow it to
aggressively  build out its  licensed  territory  and gain  market  share in the
growing domestic wireless industry.

MINIMUM INITIAL INVESTMENT - $1,000

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

WWW.GABELLI.COM

      Please visit us on the Internet.  Our 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].

IN CONCLUSION

      The Gabelli Global  Opportunity  Fund continued its bumpy ride through the
third  quarter.  As we take a step back and  examine  what have been a difficult
quarter and a difficult year, we are confident that as dynamics improve the Fund
is positioned to get back on track in the months ahead.  We do have our work cut
out for us, though, and we are ready to face these challenges head-on.

                                        7

                                     <PAGE>

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

                                   Sincerely,

                    /S/ SIGNUATURE                   /S/ SIGNATURE

                    MARC J. GABELLI                  CAESAR BRYAN
                    Team Portfolio Manager           Team Portfolio Manager


                                                     /S/ SIGNATURE

                                                     IVAN ARTEAGA, CFA
                                                     Associate Portfolio Manager

November 14, 2000


---------------------------------------------------------------------------
                                TOP TEN HOLDINGS
                               SEPTEMBER 30, 2000
                               ------------------
Allianz AG                                      DDI Corp.
AT&T Corp.                                      Verizon Communications
Mellon Financial Corp.                          Morgan (J.P.) & Co. Inc.
Lockheed Martin Corp.                           NTL Inc.
Merrill Lynch & Co. Inc.                        Furukawa Electric Co. Ltd.
---------------------------------------------------------------------------

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

                                        8

                                     <PAGE>

THE GABELLI GLOBAL OPPORTUNITY FUND
PORTFOLIO OF INVESTMENTS -- SEPTEMBER 30, 2000 (UNAUDITED)
================================================================================

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


                 COMMON STOCKS -- 80.7%
                 AEROSPACE -- 2.8%
     85,000      BAE Systems plc ..............................      $   458,705
     20,000      Lockheed Martin Corp. ........................          659,200
                                                                     -----------
                                                                       1,117,905
                                                                     -----------
                 AUTOMOTIVE -- 0.6%
      3,761      General Motors Corp. .........................          244,465
                                                                     -----------
                 BROADCASTING -- 4.0%
      3,650      Audiofina ....................................          395,521
         15      Fuji Television Network Inc. .................          194,336
     15,000      Mediaset SpA .................................          223,430
      4,000      Nippon Broadcasting System Inc. ..............          222,839
      7,750      NRJ Groupe+ ..................................          305,010
      6,000      Tokyo Broadcasting System Inc. ...............          241,533
                                                                     -----------
                                                                       1,582,669
                                                                     -----------
                 BUILDING AND CONSTRUCTION -- 0.8%
     20,300      CRH plc ......................................          323,155
                                                                     -----------
                 BUSINESS SERVICES -- 2.6%
      5,000      Asatsu-DK Inc. ...............................          171,201
     15,000      Reuters Holdings plc .........................          284,316
      3,000      Secom Co. Ltd. ...............................          241,255
      4,376      Vivendi ......................................          325,138
                                                                     -----------
                                                                       1,021,910
                                                                     -----------
                 CABLE -- 1.9%
     12,187      NTL Inc.+ ....................................          564,410
      7,000      UnitedGlobalCom Inc., Cl. A+ .................          210,000
                                                                     -----------
                                                                         774,410
                                                                     -----------
                 COMMUNICATIONS EQUIPMENT -- 2.6%
     20,000      Furukawa Electric Co. Ltd. ...................          552,471
     27,000      Marconi plc ..................................          369,255
      7,000      Telesystem International Wireless Inc.+ ......           98,862
                                                                     -----------
                                                                       1,020,588
                                                                     -----------
                 COMPUTER SOFTWARE AND SERVICES -- 1.1%
         15      Net One Systems Co. Ltd. .....................          426,152
                                                                     -----------
                 CONSUMER PRODUCTS -- 3.2%
      8,000      Christian Dior SA ............................          430,977
        150      Compagnie Financiere Richemont AG, Cl. A .....          450,840
         40      Givaudan+ ....................................           10,356
      2,000      Nintendo Co. Ltd. ............................          365,168
                                                                     -----------
                                                                       1,257,341
                                                                     -----------
                 ELECTRONICS -- 1.3%
      2,000      Kyocera Corp. ................................          305,386
      2,000      Sony Corp., ADR ..............................          201,875
                                                                     -----------
                                                                         507,261
                                                                     -----------


                                                                       MARKET
     SHARES                                                            VALUE
     ------                                                            -----
                 ENERGY AND UTILITIES -- 0.5%
      2,500      Schlumberger Ltd. ............................      $   205,781
                                                                     -----------
                 ENTERTAINMENT -- 5.7%
      2,000      Avex Inc. ....................................          205,441
     45,131      Granada Compass plc+ .........................          422,377
     25,176      Liberty Media Group, Cl. A+ ..................          453,168
     30,000      Publishing & Broadcasting Ltd. ...............          217,707
      9,500      Seagram Co. ..................................          545,656
     20,000      USA Networks Inc.+ ...........................          438,750
                                                                     -----------
                                                                       2,283,099
                                                                     -----------
                 FINANCIAL SERVICES -- 14.9%
      2,250      Allianz AG ...................................          743,554
      2,000      AXA-UAP ......................................          261,198
     50,000      Bank of Ireland ..............................          400,401
      8,000      Citigroup Inc. ...............................          432,500
      5,000      Invik & Co. AB, Cl. B ........................          464,029
     15,000      Mellon Financial Corp. .......................          695,625
      9,000      Merrill Lynch & Co. Inc. .....................          594,000
      3,500      Morgan (J.P.) & Co. Inc. .....................          571,813
      1,000      Munich Re ....................................          295,613
     50,000      Nikko Securities Co. Ltd. ....................          444,198
     20,000      Prudential plc ...............................          272,931
     25,000      San Paolo - IMI SpA ..........................          406,357
     30,000      Skandinaviska Enskilda Banken, Cl. A .........          362,815
                                                                     -----------
                                                                       5,945,034
                                                                     -----------
                 HEALTH CARE -- 4.9%
        340      Novartis AG ..................................          521,279
         40      Roche Holding AG .............................          351,762
     10,000      Sanofi-Synthelabo SA .........................          537,397
     40,000      SmithKline Beecham plc .......................          547,932
                                                                     -----------
                                                                       1,958,370
                                                                     -----------
                 METALS AND MINING -- 1.9%
     40,000      Antofagasta Holdings plc .....................          280,324
     17,500      Stillwater Mining Co.+ .......................          473,725
                                                                     -----------
                                                                         754,049
                                                                     -----------
                 PUBLISHING -- 4.2%
     20,000      Arnoldo Mondadori Editore SpA ................          237,902
     32,032      Gruppo Editoriale L'Espresso SpA .............          386,677
     68,000      Independent News & Media plc, Dublin .........          249,021
      7,000      News Corp. Ltd., ADR .........................          392,438
      8,000      Schibsted ASA ................................          140,554
     25,000      United News & Media plc ......................          269,641
                                                                     -----------
                                                                       1,676,233
                                                                     -----------
                 REAL ESTATE -- 0.9%
     30,000      Cheung Kong (Holdings) Ltd. ..................          362,645
                                                                     -----------


                                        9

                                     <PAGE>

THE GABELLI GLOBAL OPPORTUNITY FUND
PORTFOLIO OF INVESTMENTS (CONTINUED) -- SEPTEMBER 30, 2000 (UNAUDITED)
================================================================================
                                                                       MARKET
     SHARES                                                            VALUE
     ------                                                            -----


                 COMMON STOCKS (CONTINUED)
                 RETAIL -- 0.9%
      7,000      Ito Yokado Co. Ltd. ..........................      $   364,705
                                                                     -----------
                 SATELLITE -- 2.6%
     10,000      EchoStar Communications Corp., Cl. A+ ........          527,500
      3,957      General Motors Corp., Cl. H+ .................          147,121
      2,500      Societe Europeenne Satellites ................          375,031
                                                                     -----------
                                                                       1,049,652
                                                                     -----------
                 TELECOMMUNICATIONS -- 16.6%
     25,000      AT&T Corp. ...................................          734,375
      5,500      BCE Inc. .....................................          128,563
     15,000      British Telecommunications plc ...............          157,682
     10,000      BroadWing Inc.+ ..............................          255,625
      7,750      Cable & Wireless plc, ADR ....................          329,859
     35,180      Citizens Communications Co. ..................          472,731
         90      DDI Corp. ....................................          591,338
     12,500      Electric Lightwave Inc., Cl. A+ ..............          106,250
      5,125      Global Crossing Ltd.+ ........................          158,875
         15      Japan Telecom Co. Ltd. .......................          433,093
      3,000      KDD Corp. ....................................          214,020
     15,000      Manitoba Telecom Services Inc. ...............          301,569
    160,000      Olivetti SpA+ ................................          440,507
     25,000      Portugal Telecom SA ..........................          257,006
     10,500      Rogers Communications Inc., Cl. B, ADR+ ......          248,719
     12,000      Sprint Corp. .................................          351,750
      1,500      Telecom Italia SpA, ADR ......................          157,500
     25,000      Telecom Italia SpA, Cl. RNC ..................          136,335
      3,714      Telefonica SA, ADR ...........................          220,751
     10,000      United Pan-Europe Communications NV,
                   Cl. A, ADR+ ................................          194,375
     12,000      Verizon Communications .......................          581,250
     15,000      Viatel Inc.+ .................................          153,750
                                                                     -----------
                                                                       6,625,923
                                                                     -----------
                 TRANSPORTATION -- 1.2%
     15,000      AMR Corp.+ ...................................          490,313
                                                                     -----------


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

                 WIRELESS COMMUNICATIONS -- 5.5%
      5,000      AT&T Wireless Group+ .........................      $   104,375
     10,000      Nextel Communications Inc., Cl. A+ ...........          467,500
     30,000      Telecom Italia Mobile SpA ....................          242,491
      2,300      Telephone & Data Systems Inc. ................          254,610
      5,000      United States Cellular Corp.+ ................          350,000
     83,964      Vodafone Group plc ...........................          313,455
      4,000      VoiceStream Wireless Corp.+ ..................          464,250
                                                                     -----------
                                                                       2,196,681
                                                                     -----------
                 TOTAL COMMON STOCKS ..........................       32,188,341
                                                                     -----------
  PRINCIPAL
   AMOUNT
   ------

                 U.S. GOVERNMENT OBLIGATIONS -- 17.7%
 $7,162,000      U.S. Treasury Bills,
                   6.12% to 6.29%++,
                   due 10/05/00 to 12/28/00 ...................        7,088,654
                                                                     -----------
                 TOTAL INVESTMENTS -- 98.4%
                  (Cost $36,995,135) ..........................       39,276,995

                 OTHER ASSETS AND
                   LIABILITIES (NET) -- 1.6% ..................          620,482
                                                                     -----------
                 NET ASSETS -- 100.0%
                   (2,317,525 shares outstanding) .............      $39,897,477
                                                                     ===========
------------------------
+     Non-income producing security.
++    Represents annualized yield at date of purchase.
ADR - American Depositary Receipt.

                                     % OF
                                    MARKET         MARKET
    GEOGRAPHIC DIVERSIFICATION       VALUE          VALUE
    --------------------------      ------      -----------
    North America                    48.0%      $18,852,451
    Latin America                     0.4%          158,875
    Europe                           35.1%       13,788,009
    Asia/Pacific Rim                  3.3%       13,302,649
    Japan                            13.2%        5,175,011
                                    ------      -----------
                                    100.0%      $39,276,995
                                    ======      ===========



                                       10

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

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

GABELLI WESTWOOD EQUITY FUND _____________
Seeks to invest primarily in the common stock of seasoned  companies believed to
have proven records and above average  historical  earnings  growth.  The Fund's
primary objective is capital appreciation. (MULTI-CLASS)
                                               PORTFOLIO MANAGER: SUSAN M. BYRNE

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

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

GABELLI WESTWOOD SMALLCAP EQUITY FUND ___________
Seeks to invest primarily in smaller  capitalization  equity securities - market
caps of $1 billion or less.  The Fund's primary  objective is long-term  capital
appreciation. (MULTI-CLASS)
                                           PORTFOLIO MANAGER:  LYNDA CALKIN, CFA

GABELLI WESTWOOD INTERMEDIATE BOND FUND __________
Seeks to invest in a diversified portfolio of bonds with various maturities. The
Fund's primary objective is total return. (MULTI-CLASS)
                                              PORTFOLIO MANAGER:  PATRICIA FRAZE

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

GABELLI WESTWOOD BALANCED FUND __________
Seeks to invest in a balanced and diversified portfolio of stocks and bonds. The
Fund's  primary  objective  is both  capital  appreciation  and current  income.
(MULTI-CLASS)
                             PORTFOLIO MANAGERS: SUSAN M. BYRNE & PATRICIA FRAZE

GABELLI WESTWOOD MIGHTY MITES[SERVICE MARK} FUND _____
Seeks to invest in micro-cap companies that have market  capitalizations of $300
million or less. The Fund's primary objective is long-term capital appreciation.
(MULTI-CLASS)
                                           TEAM MANAGED:  MARIO J. GABELLI, CFA,
                                          MARC J. GABELLI,  LAURA K. LINEHAN AND
                                                                 WALTER K. WALSH

GABELLI VALUE FUND ________________________
Seeks to invest in  securities  of  companies  believed to be  undervalued.  The
Fund's primary objective is long-term capital appreciation.
MAX. SALES CHARGE: 51/2% (MULTI-CLASS)
                                       PORTFOLIO MANAGER:  MARIO J. GABELLI, CFA

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

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

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

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

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

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

GLOBAL SERIES
  GABELLI GLOBAL TELECOMMUNICATIONS FUND
  Seeks  to  invest  in  telecommunications  companies  throughout  the  world -
  targeting  undervalued  companies with strong earnings and cash flow dynamics.
  The Fund's  primary  objective  is capital  appreciation.  (MULTI-CLASS)  TEAM
  MANAGED

  GABELLI GLOBAL CONVERTIBLE SECURITIES FUND
  Seeks  to  invest   principally  in  bonds  and  preferred  stocks  which  are
  convertible  into common stock of foreign and domestic  companies.  The Fund's
  primary  objective is total return through a combination of current income and
  capital appreciation. (MULTI-CLASS)                               TEAM MANAGED

  GABELLI GLOBAL GROWTH FUND
  Seeks capital appreciation  through a disciplined  investment program focusing
  on the globalization and  interactivity of the world's  marketplace.  The Fund
  invests in  companies  at the  forefront  of  accelerated  growth.  The Fund's
  primary objective is capital appreciation. (MULTI-CLASS)          TEAM MANAGED

  GABELLI GLOBAL OPPORTUNITY FUND
  Seeks to  invest in common  stock of  companies  which  have  rapid  growth in
  revenues and earnings and potential for above average capital  appreciation or
  are  undervalued.  The  Fund's  primary  objective  is  capital  appreciation.
  (MULTI-CLASS)                                                     TEAM MANAGED

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

GABELLI INTERNATIONAL GROWTH FUND __________
  Seeks to invest in the equity  securities  of foreign  issuers with  long-term
  capital   appreciation   potential.   The   Fund   offers   investors   global
  diversification. (MULTI-CLASS)                 PORTFOLIO MANAGER: CAESAR BRYAN

THE SIX FUNDS  ABOVE  INVEST IN  FOREIGN  SECURITIES  WHICH  INVOLVES  RISKS NOT
ORDINARILY  ASSOCIATED WITH INVESTMENTS IN DOMESTIC ISSUES,  INCLUDING  CURRENCY
FLUCTUATION,   ECONOMIC  AND  POLITICAL   RISKS.  THE  FUNDS  LISTED  ABOVE  ARE
DISTRIBUTED BY GABELLI & COMPANY, INC.
--------------------------------------------------------------------------------
           TO RECEIVE A PROSPECTUS, CALL 1-800-GABELLI (422-3554). THE
            PROSPECTUS GIVES A MORE COMPLETE DESCRIPTION OF THE FUND,
           INCLUDING FEES AND EXPENSES. READ THE PROSPECTUS CAREFULLY
                        BEFORE YOU INVEST OR SEND MONEY.
                              VISIT OUR WEBSITE AT:
                                 www.gabelli.com
                                    OR, CALL:
                                  1-800-GABELLI
         1-800-422-3554 [BULLET] 914-921-5100 [BULLET] FAX: 914-921-5118
                           [BULLET] [email protected]
                    ONE CORPORATE CENTER, RYE, NEW YORK 10580

                                     <PAGE>

        Gabelli Global Series Funds, Inc.
       THE GABELLI GLOBAL OPPORTUNITY 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           Karl Otto Pohl
CHAIRMAN AND CHIEF              FORMER PRESIDENT
INVESTMENT OFFICER              DEUTSCHE BUNDESBANK
GABELLI ASSET MANAGEMENT INC.

Felix J. Christiana             Werner J. Roeder, MD
FORMER SENIOR VICE PRESIDENT    MEDICAL DIRECTOR
DOLLAR DRY DOCK SAVINGS BANK    LAWRENCE HOSPITAL

Anthony J. Colavita             Anthonie C. van Ekris
ATTORNEY-AT-LAW                 MANAGING DIRECTOR
ANTHONY J. COLAVITA, P.C.       BALMAC INTERNATIONAL, INC.

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  Global  Opportunity  Fund. It is not  authorized  for  distribution  to
prospective investors unless preceded or accompanied by an effective prospectus.
--------------------------------------------------------------------------------
GAB403Q300SR


                                            [PHOTO OF MARIO J. GABELLI OMITTTED]


                                        THE
                                        GABELLI
                                        GLOBAL
                                        OPPORTUNITY
                                        FUND

                                                            THIRD QUARTER REPORT
                                                              SEPTEMBER 30, 2000


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