UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM N-CSR

   CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES

                  Investment Company Act file number 811-04873
                                                    -----------

                              The GAMCO Growth Fund
                 ----------------------------------------------
               (Exact name of registrant as specified in charter)

                              One Corporate Center
                            Rye, New York 10580-1422
                 ----------------------------------------------
               (Address of principal executive offices) (Zip code)

                                 Bruce N. Alpert
                               Gabelli Funds, LLC
                              One Corporate Center
                            Rye, New York 10580-1422
                 ----------------------------------------------
                     (Name and address of agent for service)


       registrant's telephone number, including area code: 1-800-422-3554
                                                           --------------

                      Date of fiscal year end: December 31
                                               -----------

                   Date of reporting period: December 31, 2005
                                            -------------------


Form N-CSR is to be used by management investment companies to file reports with
the Commission not later than 10 days after the  transmission to stockholders of
any report that is required to be transmitted to  stockholders  under Rule 30e-1
under the Investment Company Act of 1940 (17 CFR 270.30e-1).  The Commission may
use the information provided on Form N-CSR in its regulatory, disclosure review,
inspection, and policymaking roles.

A registrant  is required to disclose the  information  specified by Form N-CSR,
and the  Commission  will make this  information  public.  A  registrant  is not
required to respond to the  collection  of  information  contained in Form N-CSR
unless the Form  displays a  currently  valid  Office of  Management  and Budget
("OMB")  control number.  Please direct comments  concerning the accuracy of the
information  collection  burden  estimate and any  suggestions  for reducing the
burden to  Secretary,  Securities  and Exchange  Commission,  100 F Street,  NE,
Washington,  DC 20549. The OMB has reviewed this collection of information under
the clearance requirements of 44 U.S.C. ss. 3507.


ITEM 1. REPORTS TO STOCKHOLDERS.

The Report to Shareholders is attached herewith.


                              THE GAMCO GROWTH FUND

                                  ANNUAL REPORT
                                DECEMBER 31, 2005





TO OUR SHAREHOLDERS,

      The Sarbanes-Oxley Act requires a Fund's principal executive and financial
officers  to  certify  the  entire   contents  of  the  semi-annual  and  annual
shareholder  reports in a filing with the Securities and Exchange  Commission on
Form N-CSR. This certification  would cover the portfolio  manager's  commentary
and  subjective  opinions  if they are  attached  to or a part of the  financial
statements. Many of these comments and opinions would be difficult or impossible
to certify.

      Because we do not want our portfolio  managers to eliminate their opinions
and/or  restrict their  commentary to historical  facts, we have separated their
commentary from the financial  statements and investment portfolio and have sent
it to  you  separately.  Both  the  commentary  and  the  financial  statements,
including  the  portfolio  of  investments,  will be available on our website at
www.gabelli.com/funds.

      Enclosed are the audited financial statements and the investment portfolio
as of  December  31,  2005 with a  description  of  factors  that  affected  the
performance during the past year.

PERFORMANCE DISCUSSION

      The year was similar to 2004.  Strong earnings  overcame Fed interest rate
increases,  natural  disasters and soaring  energy prices to lift stocks higher.
Returns were strong in energy and  materials  related  issues and varied  widely
across and within other sectors.  For the year, large-cap growth stocks staged a
comeback of sorts, and we fully  participated in the market's  advance.  We were
fortunate to have a number of holdings  perform well,  especially in the energy,
healthcare,  information technology and materials areas. For the 12 months ended
December 31, 2005,  the Fund returned  10.30%  compared to 4.91% for the S&P 500
and 5.26% for the Russell 1000 Growth Index.

     For the year, energy was far and away the top performing sector,  according
to Standard & Poor's,  with the sector returning 29.1%. The next best sector was
Utilities,  with a gain  of  12.8%,  a  group  we did not  participate  in.  Our
relatively  good results were driven by strong  energy and  materials  holdings,
along  with  exceptional   returns  from  certain   healthcare  and  information
technology stocks. Our  top-performing  holding was healthcare  services company
Express  Scripts Inc.  (+119%),  followed by Burlington  Resources Inc.  (+98%),
Suncor Energy Inc.  (+78%),  Google Inc.  (+71% from purchase price during year)
and Genentech  Inc.  (+70%).  Other  winners were  Allegheny  Technologies  Inc.
(+67%),  Transocean  Inc.  (+64%),  Whole Foods Market Inc.  (+62%),  Alcon Inc.
(+61%) and Devon Energy Corp.  (+61%).  These  companies all had robust earnings
gains in 2005, which propelled their shares higher.

     Our  weakest  holdings  for the year  were Dell Inc.  (-29%),  Sysco  Corp.
(-19%),  Zimmer Holdings Inc. (-16%),  Biomet Inc. (-16%),  Harley-Davidson Inc.
(-15%),  Electronic  Arts Inc.  (-15%),  News  Corp.  (-14%),  UPS Inc.  (-12%),
Wal-Mart  Stores Inc.  (-11%) and Cisco  Systems Inc.  (-11%).  There is no real
theme here as these  companies  were for the most part  grappling with different
issues. The weakest S&P industry sector was  telecommunication  services,  which
fell 9.0%.  Our  performance  was helped by the absence of  investments  in this
sector.

                                Sincerely yours,

                                /s/ Bruce N. Alpert

                                 Bruce N. Alpert
                                 President
February 13, 2006




                               [GRAPHIC OMITTED]
                              PLOT POINTS FOLLOW:

            COMPARISON OF CHANGE IN VALUE OF A $10,000 INVESTMENT IN
                  THE GAMCO GROWTH FUND AND THE S&P 500 INDEX

                            GAMCO Growth Fund
                                Class AAA         S&P 500 Index
                  4/10/87        $10,000            $10,000
                 12/31/87          9,510              8,447
                 12/31/88         13,234              9,846
                 12/31/89         18,542             12,961
                 12/31/90         18,173             12,558
                 12/31/91         24,410             16,375
                 12/31/92         25,506             17,621
                 12/31/93         28,378             19,394
                 12/31/94         27,414             19,648
                 12/31/95         36,383             27,022
                 12/31/96         43,449             33,224
                 12/31/97         61,971             44,304
                 12/31/98         80,426             56,975
                 12/31/99        117,623             68,956
                 12/31/00        105,191             62,681
                 12/31/01         79,840             55,235
                 12/31/02         52,862             43,033
                 12/31/03         69,450             55,371
                 12/31/04         72,707             61,390
                 12/31/05         80,196             64,404

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE RESULTS. The performance tables and
graph do not reflect the deduction of taxes that a shareholder would pay on fund
distributions or the redemption of fund shares.

COMPARATIVE RESULTS
- --------------------------------------------------------------------------------
              AVERAGE ANNUAL RETURNS THROUGH DECEMBER 31, 2005 (A)
              ----------------------------------------------------


                                                                                                       Since
                                                                                                     Inception
                                    Quarter    Year      3 Year    5 Year     10 Year    15 Year     (4/10/87)
- --------------------------------------------------------------------------------------------------------------

                                                                                  
  GAMCO GROWTH FUND CLASS AAA ....  3.60%    10.30%     14.91%     (5.28)%      8.23%     10.40%       11.75%

  S&P 500 Index ..................  2.08      4.91      14.38       0.54        9.07      11.51        10.51
  Russell 1000 Growth Index ......  2.98      5.26      13.23      (3.58)       6.73       N/A*         N/A*
  Class A ........................  3.59     10.29      14.92      (5.27)       8.21      10.39        11.74
                                   (2.37)(b)  3.97(b)   12.67(b)   (6.39)(b)    7.57(b)    9.96(b)     11.39(b)
  Class B ........................  3.39      9.45      14.33      (5.56)       8.06      10.29        11.66
                                   (1.61)(c)  4.45(c)   13.56(c)   (5.94)(c)    8.06(c)   10.29(c)     11.66(c)
  Class C ........................  3.39      9.45      14.33      (5.56)       8.06      10.29        11.66
                                    2.39(c)   8.45(c)   14.33(c)   (5.56)(c)    8.06(c)   10.29(c)     11.66(c)

(a)  RETURNS  REPRESENT PAST  PERFORMANCE  AND DO NOT GUARANTEE  FUTURE RESULTS.
     TOTAL RETURNS AND AVERAGE  ANNUAL RETURNS  REFLECT  CHANGES IN SHARE PRICES
     AND REINVESTMENT OF DIVIDENDS AND ARE NET OF EXPENSES.  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.
     PERFORMANCE  RETURNS  FOR  PERIODS  LESS THAN ONE YEAR ARE NOT  ANNUALIZED.
     CURRENT  PERFORMANCE  MAY BE LOWER OR  HIGHER  THAN  THE  PERFORMANCE  DATA
     PRESENTED. VISIT WWW.GABELLI.COM FOR PERFORMANCE INFORMATION AS OF THE MOST
     RECENT MONTH END.  INVESTORS  SHOULD  CONSIDER THE  INVESTMENT  OBJECTIVES,
     RISKS,  CHARGES,  AND EXPENSES OF THE FUND CAREFULLY BEFORE INVESTING.  THE
     PROSPECTUS  CONTAINS  MORE  INFORMATION  ABOUT THIS AND OTHER  MATTERS  AND
     SHOULD BE READ CAREFULLY BEFORE INVESTING.
     THE CLASS AAA SHARES' NET ASSET  VALUES ARE USED TO  CALCULATE  PERFORMANCE
     FOR THE PERIODS PRIOR TO THE ISSUANCE OF CLASS A SHARES, CLASS B SHARES AND
     CLASS C SHARES ON DECEMBER 31, 2003. THE ACTUAL PERFORMANCE FOR THE CLASS B
     SHARES  AND  CLASS C SHARES  WOULD  HAVE BEEN  LOWER DUE TO THE  ADDITIONAL
     EXPENSES ASSOCIATED WITH THESE CLASSES OF SHARES. THE S&P 500 INDEX AND THE
     RUSSELL  1000  GROWTH  INDEX  ARE  UNMANAGED  INDICATORS  OF  STOCK  MARKET
     PERFORMANCE. DIVIDENDS ARE REINVESTED.
(b)  INCLUDES THE EFFECT OF THE MAXIMUM  5.75% SALES CHARGE AT THE  BEGINNING OF
     THE PERIOD.
(c)  INCLUDES THE EFFECT OF THE APPLICABLE  CONTINGENT  DEFERRED SALES CHARGE AT
     THE END OF THE PERIOD  SHOWN FOR CLASS B AND CLASS C SHARES,  RESPECTIVELY.
     CLASS B SHARES ARE NOT AVAILABLE FOR NEW PURCHASES.
   * THERE IS  NO  DATA  AVAILABLE  FOR THE RUSSELL  1000 GROWTH  INDEX PRIOR TO
     AUGUST 31, 1992.
- --------------------------------------------------------------------------------
                                       2



SUMMARY OF PORTFOLIO HOLDINGS (UNAUDITED)

The following table presents portfolio holdings as a percent of total net assets
as of December 31, 2005:

THE GAMCO GROWTH FUND

Industrial ....................................   14.9%
Financial .....................................   12.5%
Software & Services ...........................   12.1%
Consumer Staples ..............................   10.7%
Health Care Equipment & Services ..............   10.0%
Energy ........................................    9.6%
Retail ........................................    8.2%
Materials .....................................    5.0%
Pharmaceuticals & Biotechnology ...............    4.6%
Semiconductors ................................    4.4%
Media .........................................    3.5%
Communications Equipment ......................    2.1%
Computers & Peripheral ........................    1.3%
U.S. Government Obligations ...................    1.0%
Auto & Components .............................    0.4%
Other Assets and Liabilities - (Net) ..........   (0.3)%
                                                --------
                                                 100.0%
                                                ========




THE FUND FILES A COMPLETE  SCHEDULE OF PORTFOLIO  HOLDINGS  WITH THE SEC FOR THE
FIRST AND THIRD  QUARTERS OF EACH FISCAL YEAR ON FORM N-Q, THE LAST OF WHICH WAS
FILED FOR THE QUARTER  ENDED  SEPTEMBER 30, 2005.  SHAREHOLDERS  MAY OBTAIN THIS
INFORMATION   AT   WWW.GABELLI.COM   OR  BY  CALLING  THE  FUND  AT  800-GABELLI
(800-422-3554).  THE  FUND'S  FORM N-Q IS  AVAILABLE  ON THE  SEC'S  WEBSITE  AT
WWW.SEC.GOV  AND MAY ALSO BE  REVIEWED  AND  COPIED AT THE  COMMISSION'S  PUBLIC
REFERENCE  ROOM IN  WASHINGTON,  DC.  INFORMATION ON THE OPERATION OF THE PUBLIC
REFERENCE ROOM MAY BE OBTAINED BY CALLING 1-800-SEC-0330.





PROXY VOTING

The Fund files Form N-PX with its complete proxy voting record for the 12 months
ended June 30th,  no later than August 31st of each year. A  description  of the
Fund's  proxy  voting  policies,  procedures,  and how the  Fund  voted  proxies
relating to portfolio securities are available without charge, upon request, (i)
by calling 800-GABELLI  (800-422-3554);  (ii) by writing to The Gabelli Funds at
One Corporate Center,  Rye, NY 10580-1422;  and (iii) by visiting the Securities
and Exchange Commission's website at www.sec.gov.





                                       3



THE GAMCO GROWTH  FUND
DISCLOSURE OF FUND EXPENSES  (UNAUDITED)
For the Six Month Period from July 1, 2005 through December 31, 2005
                                                                   EXPENSE TABLE
================================================================================
We believe it is important for you to understand the impact of fees and expenses
regarding  your  investment.  All mutual  funds have  operating  expenses.  As a
shareholder  of a fund,  you  incur  ongoing  costs,  which  include  costs  for
portfolio  management,  administrative  services,  and shareholder reports (like
this one), among others.  Operating  expenses,  which are deducted from a fund's
gross income,  directly  reduce the investment  return of a fund.  When a fund's
expenses are expressed as a percentage of its average net assets, this figure is
known as the expense  ratio.  The  following  examples  are intended to help you
understand  the  ongoing  costs (in  dollars) of  investing  in your Fund and to
compare these costs with those of other mutual funds.  The examples are based on
an  investment  of $1,000 made at the beginning of the period shown and held for
the entire period.

The Expense Table below illustrates your Fund's costs in two ways:

ACTUAL FUND  RETURN:  This section  provides  information  about actual  account
values and actual expenses. You may use this section to help you to estimate the
actual  expenses that you paid over the period after any fee waivers and expense
reimbursements.  The "Ending  Account  Value"  shown is derived  from the Fund's
ACTUAL return during the past six months,  and the "Expenses Paid During Period"
shows the dollar  amount  that would have been paid by an  investor  who started
with $1,000 in the Fund. You may use this information,  together with the amount
you invested, to estimate the expenses that you paid over the period.

To do so, simply  divide your account  value by $1,000 (for  example,  an $8,600
account value  divided by $1,000 = 8.6),  then multiply the result by the number
given for your Fund under the heading  "Expenses Paid During Period" to estimate
the expenses you paid during this period.

HYPOTHETICAL 5% RETURN:  This section provides  information  about  hypothetical
account  values and  hypothetical  expenses  based on the Fund's actual  expense
ratio. It assumes a hypothetical  annualized return of 5% before expenses during
the period shown. In this case - because the hypothetical return used is NOT the
Fund's  actual  return - the  results  do not apply to your  investment  and you
cannot use the  hypothetical  account  value and expense to estimate  the actual
ending  account  balance or expenses  you paid for the period.  This  example is
useful in making  comparisons  of the ongoing costs of investing in the Fund and
other  funds.  To do so,  compare  this  5%  hypothetical  example  with  the 5%
hypothetical examples that appear in shareholder reports of other funds.

Please note that the  expenses  shown in the table are meant to  highlight  your
ongoing  costs only and do not  reflect  any  transactional  costs such as sales
charges (loads),  redemption fees, or exchange fees, if any, which are described
in the Prospectus. If these costs were applied to your account, your costs would
be higher.  Therefore, the 5% hypothetical return is useful in comparing ongoing
costs only,  and will not help you determine the relative  total costs of owning
different funds. The "Annualized  Expense Ratio"  represents the actual expenses
for the last six  months  and may be  different  from the  expense  ratio in the
Financial Highlights which is for the year ended December 31, 2005.

                  Beginning       Ending     Annualized    Expenses
                Account Value  Account Value  Expense    Paid During
                   07/01/05      12/31/05       Ratio       Period*
- --------------------------------------------------------------------------------
GAMCO GROWTH FUND
- --------------------------------------------------------------------------------
ACTUAL FUND RETURN
Class AAA          $1,000.00    $1,105.50       1.46%        $ 7.75
Class A            $1,000.00    $1,105.50       1.43%        $ 7.59
Class B            $1,000.00    $1,101.30       2.20%        $11.65
Class C            $1,000.00    $1,101.30       2.20%        $11.65

HYPOTHETICAL 5% RETURN
Class AAA          $1,000.00    $1,017.85       1.46%        $ 7.43
Class A            $1,000.00    $1,018.00       1.43%        $ 7.27
Class B            $1,000.00    $1,014.12       2.20%        $11.17
Class C            $1,000.00    $1,014.12       2.20%        $11.17

*  Expenses are equal to the Fund's  annualized  expense  ratio for the last six
   months multiplied by the average account value over the period, multiplied by
   the number of days in the most recent fiscal half-year, then divided by 365.

                                       4


THE GAMCO GROWTH FUND
SCHEDULE OF INVESTMENTS -- DECEMBER 31, 2005
================================================================================

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

              COMMON STOCKS -- 99.3%
              CONSUMER DISCRETIONARY -- 12.1%
              AUTO & COMPONENTS -- 0.4%
      75,000  Harley-Davidson Inc. ....$  3,549,974      $    3,861,750
                                       ------------      --------------
              MEDIA -- 3.5%
      50,000  Boyd Gaming Corp. .......   2,325,282           2,383,000
      20,000  Las Vegas Sands Corp.+ ..     812,940             789,400
     230,000  McGraw-Hill Companies
                Inc. ..................   5,605,642          11,874,900
     170,000  News Corp., Cl. B .......   3,234,043           2,823,700
   1,270,000  Time Warner Inc. ........  21,432,121          22,148,800
                                       ------------      --------------
                                         33,410,028          40,019,800
                                       ------------      --------------
              RETAIL -- 8.2%
     175,000  Bed Bath & Beyond Inc.+     6,690,348           6,326,250
      85,000  Best Buy Co. Inc. .......   3,207,702           3,695,800
     215,000  Cheesecake Factory Inc.+    5,475,834           8,038,850
     125,000  Chico's FAS Inc.+ .......   5,037,537           5,491,250
     195,000  Coach Inc.+ .............   4,589,057           6,501,300
     135,000  Costco Wholesale Corp. ..   5,890,582           6,678,450
     380,000  eBay Inc.+ ..............  14,981,487          16,435,000
     260,000  Starbucks Corp.+ ........   4,019,454           7,802,600
     125,000  Target Corp. ............   5,165,862           6,871,250
     286,577  The Home Depot Inc. .....   7,903,571          11,600,637
     283,400  Tiffany & Co. ...........   7,327,872          10,851,386
     140,000  Urban Outfitters Inc.+ ..   4,291,641           3,543,400
                                       ------------      --------------
                                         74,580,947          93,836,173
                                       ------------      --------------
              TOTAL CONSUMER
                DISCRETIONARY ......... 111,540,949         137,717,723
                                       ------------      --------------
              CONSUMER STAPLES -- 10.7%
      90,000  Hershey Co. .............   5,141,713           4,972,500
      60,000  Nestle SA, ADR ..........   4,446,450           4,472,856
     500,000  PepsiCo Inc. ............  24,635,063          29,540,000
     575,000  Procter & Gamble Co. ....  31,167,837          33,281,000
     105,000  Sysco Corp. .............   3,078,747           3,260,250
     250,000  Wal-Mart Stores Inc. ....  13,368,139          11,700,000
     585,000  Walgreen Co. ............  18,201,005          25,892,100
      30,000  Whole Foods Market Inc.     1,219,585           2,321,700
     105,000  Wrigley (Wm.) Jr. Co. ...   7,498,088           6,981,450
                                       ------------      --------------
              TOTAL
                CONSUMER STAPLES ...... 108,756,627         122,421,856
                                       ------------      --------------
              ENERGY -- 9.6%
      40,000  Amerada Hess Corp. ......   5,356,694           5,072,800
      55,000  Anadarko Petroleum Corp.    4,231,594           5,211,250
      76,000  Apache Corp. ............   2,443,523           5,207,520
      90,000  Baker Hughes Inc. .......   4,626,387           5,470,200
      50,000  Burlington Resources Inc.   1,627,055           4,310,000

                                                             MARKET
     SHARES                                 COST              VALUE
     ------                                 ----             ------
     110,000  Canadian Natural
                Resources Ltd. ........$  4,876,764      $    5,458,200
     200,000  Chesapeake Energy Corp.     6,236,896           6,346,000
      80,000  Devon Energy Corp. ......   3,392,381           5,003,200
     110,000  EnCana Corp. ............   5,315,304           4,967,600
      40,000  EOG Resources Inc. ......   3,203,641           2,934,800
     100,000  Murphy Oil Corp. ........   2,552,873           5,399,000
      90,000  National-Oilwell
                Varco Inc.+ ...........   5,254,602           5,643,000
      65,000  Occidental
                Petroleum Corp. .......   2,448,219           5,192,200
     115,000  Peabody Energy Corp. ....   8,232,779           9,478,300
     108,000  Pioneer Natural
                Resources Co. .........   5,344,040           5,537,160
      59,000  Schlumberger Ltd. .......   2,738,816           5,731,850
      94,000  Suncor Energy Inc. ......   3,235,187           5,934,220
      90,000  Transocean Inc.+ ........   3,570,430           6,272,100
     100,000  Valero Energy Corp. .....   4,899,768           5,160,000
     110,000  XTO Energy Inc. .........   4,650,725           4,833,400
                                       ------------      --------------
              TOTAL ENERGY ............  84,237,678         109,162,800
                                       ------------      --------------
              FINANCIAL -- 12.5%
     215,000  American Express Co. ....   8,144,325          11,063,900
     700,000  Citigroup Inc. ..........  31,984,293          33,971,000
      85,000  Commerce Bancorp Inc. ...   2,935,764           2,924,850
     150,000  Credit Suisse Group, ADR    7,490,705           7,642,500
     120,000  Goldman Sachs Group Inc.   13,041,122          15,325,200
      70,000  Legg Mason Inc. .........   7,932,579           8,378,300
     330,000  Merrill Lynch & Co. Inc.   13,554,792          22,350,900
     205,900  Northern Trust Corp. ....  11,865,045          10,669,738
     208,800  State Street Corp. ......  10,080,364          11,575,872
     190,000  UBS AG ..................  16,193,212          18,078,500
                                       ------------      --------------
              TOTAL FINANCIAL ......... 123,222,201         141,980,760
                                       ------------      --------------
              HEALTH CARE -- 14.6%
              HEALTH CARE EQUIPMENT & SERVICES -- 10.0%
      55,000  Alcon Inc. ..............   4,356,959           7,128,000
     150,000  Biomet Inc. .............   6,401,935           5,485,500
     115,000  Caremark Rx Inc.+ .......   4,581,258           5,955,850
     120,000  Edwards Lifesciences Corp.+ 4,934,302           4,993,200
      70,000  Express Scripts Inc.+ ...   2,742,683           5,866,000
      85,000  IDEXX Laboratories Inc.+    5,482,892           6,118,300
      70,000  Lincare Holdings Inc.+ ..   3,008,947           2,933,700
     265,000  Medtronic Inc. ..........  12,644,170          15,256,050
     220,000  St. Jude Medical Inc.+ ..   7,246,759          11,044,000
     210,000  Stryker Corp. ...........  10,492,131           9,330,300
     310,000  UnitedHealth Group Inc.     8,035,193          19,263,400
     210,000  Varian Medical Systems
                Inc.+ .................   8,298,039          10,571,400
     145,000  Zimmer Holdings Inc.+ ...  11,300,086           9,778,800
                                       ------------      --------------
                                         89,525,354         113,724,500
                                       ------------      --------------

                 See accompanying notes to financial statements.

                                       5


THE GAMCO GROWTH FUND
SCHEDULE OF INVESTMENTS  (CONTINUED) -- DECEMBER 31, 2005
================================================================================

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

              COMMON STOCKS (CONTINUED)
              HEALTH CARE (CONTINUED)
              PHARMACEUTICALS & BIOTECHNOLOGY -- 4.6%
     208,000  Amgen Inc.+ .............$ 13,795,826      $   16,402,880
     165,000  Eli Lilly & Co. .........   9,778,609           9,337,350
      90,000  Genentech Inc.+ .........   4,727,103           8,325,000
     120,000  Genzyme Corp.+ ..........   6,819,345           8,493,600
     174,000  Johnson & Johnson .......   9,244,669          10,457,400
                                       ------------      --------------
                                         44,365,552          53,016,230
                                       ------------      --------------
              TOTAL HEALTH CARE ....... 133,890,906         166,740,730
                                       ------------      --------------
              INDUSTRIAL -- 14.9%
     130,000  3M Co. ..................  10,594,090          10,075,000
     175,000  C.H. Robinson
                Worldwide Inc. ........   3,847,243           6,480,250
     110,000  Caterpillar Inc. ........   4,813,524           6,354,700
      50,000  Deere & Co. .............   3,522,269           3,405,500
     100,000  Expeditors International
                of Washington Inc. ....   4,752,081           6,751,000
     130,000  Fluor Corp. .............   5,770,718          10,043,800
      93,500  General Dynamics Corp. ..   6,533,711          10,663,675
   1,305,000  General Electric Co. ....  45,589,717          45,740,250
     230,000  Ingersoll-Rand Co.
                Ltd., Cl. A ...........   9,321,185           9,285,100
     200,000  ITT Industries Inc. .....  18,125,746          20,564,000
     150,000  L-3 Communications
                Holdings Inc. .........   6,838,824          11,152,500
     160,000  Rockwell Automation Inc.    9,845,044           9,465,600
      60,000  United Parcel Service
                Inc., Cl. B ...........   4,378,496           4,509,000
     280,000  United Technologies
                Corp. .................  13,040,830          15,654,800
                                       ------------      --------------
              TOTAL INDUSTRIAL ........ 146,973,478         170,145,175
                                       ------------      --------------
              INFORMATION TECHNOLOGY -- 19.9%
              COMMUNICATIONS EQUIPMENT -- 2.1%
     626,000  Cisco Systems Inc.+ .....   9,015,862          10,717,120
      40,000  Harman International
                Industries Inc. .......   3,337,982           3,914,000
     216,000  QUALCOMM Inc. ...........   4,458,929           9,305,280
                                       ------------      --------------
                                         16,812,773          23,936,400
                                       ------------      --------------
              COMPUTERS & PERIPHERAL -- 1.3%
     500,000  Dell Inc.+ ..............  12,250,702          14,995,000
                                       ------------      --------------
              SEMICONDUCTORS -- 4.4%
     170,000  Broadcom Corp., Cl. A+ ..   6,006,791           8,015,500
     660,000  Intel Corp. .............  31,894,795          16,473,600
     360,000  Linear Technology Corp.    12,671,048          12,985,200
     220,000  Microchip Technology Inc.   5,516,796           7,073,000
     181,000  Texas Instruments Inc. ..   4,474,111           5,804,670
                                       ------------      --------------
                                         60,563,541          50,351,970
                                       ------------      --------------

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

              SOFTWARE & SERVICES -- 12.1%
     375,000  Adobe Systems Inc. ......$ 10,481,398      $   13,860,000
     150,000  CheckFree Corp.+ ........   5,011,139           6,885,000
     110,000  Citrix Systems Inc.+ ....   2,746,262           3,165,800
      90,000  Electronic Arts Inc.+ ...   4,566,604           4,707,900
     510,100  EMC Corp.+ ..............   6,745,890           6,947,562
      20,000  FactSet Research Systems
                Inc. ..................     839,511             823,200
      95,000  Getty Images Inc.+ ......   7,161,839           8,480,650
      50,900  Google Inc., Cl. A+ .....  12,337,542          21,116,374
     130,000  International Game
                Technology ............   3,808,307           4,001,400
   1,650,000  Microsoft Corp. .........  42,986,229          43,147,500
     185,000  NAVTEQ Corp.+ ...........   7,610,444           8,115,950
     430,000  Yahoo! Inc.+ ............  15,411,573          16,847,400
                                       ------------      --------------
                                        119,706,738         138,098,736
                                       ------------      --------------
              TOTAL INFORMATION
                TECHNOLOGY ............ 209,333,754         227,382,106
                                       ------------      --------------
              MATERIALS -- 5.0%
     170,000  Allegheny Technologies
                Inc. ..................   4,283,865           6,133,600
     240,000  Commercial Metals Co. ...   7,778,340           9,009,600
     245,000  Freeport-McMoRan Copper
                & Gold Inc., Cl. B ....   9,742,764          13,181,000
     310,000  Newmont Mining Corp. ....  14,377,079          16,554,000
      65,000  Rio Tinto plc, ADR ......  10,579,622          11,881,350
                                       ------------      --------------
              TOTAL MATERIALS .........  46,761,670          56,759,550
                                       ------------      --------------

              TOTAL COMMON STOCKS ..... 964,717,263       1,132,310,700
                                       ------------      --------------

   PRINCIPAL
    AMOUNT
    ------
              U.S. GOVERNMENT OBLIGATIONS -- 1.0%
 $11,979,000  U.S. Treasury Bills,
                3.506% to 4.004%++,
                01/12/06 to 03/30/06 ..  11,900,453          11,901,661
                                       ------------      --------------
              TOTAL
                INVESTMENTS -- 100.3%  $976,617,716       1,144,212,361
                                       ============
              OTHER ASSETS AND
                LIABILITIES (NET) -- (0.3)% .......          (3,471,155)
                                                         --------------
              NET ASSETS -- 100.0% ................      $1,140,741,206
                                                         ==============
- ----------------
 +    Non-income producing security.
 ++   Represents annualized yield at date of purchase.
 ADR  American Depository Receipt.


                 See accompanying notes to financial statements.


                                       6


                              THE GAMCO GROWTH FUND


STATEMENT OF ASSETS AND LIABILITIES
DECEMBER 31, 2005
================================================================================

ASSETS:
  Investments, at value (cost $976,617,716) ............$ 1,144,212,361
  Cash .................................................          4,894
  Receivable for Fund shares sold ......................      1,457,298
  Dividends receivable .................................        887,473
  Other assets .........................................         38,928
                                                        ---------------
  TOTAL ASSETS .........................................  1,146,600,954
                                                        ---------------
LIABILITIES:
  Payable for Fund shares redeemed .....................      3,411,485
  Payable for investment advisory fees .................        995,739
  Payable for shareholder services fees ................        774,705
  Payable for shareholder ............................
   communications expenses .............................        329,582
  Payable for distribution fees ........................        249,481
  Other accrued expenses ...............................         98,756
                                                        ---------------
  TOTAL LIABILITIES ....................................      5,859,748
                                                        ---------------
  NET ASSETS applicable to 39,601,917
   shares outstanding ..................................$ 1,140,741,206
                                                        ===============
NET ASSETS CONSIST OF:
  Shares of beneficial interest, each class
   at $0.01 par value ..................................$       396,019
  Additional paid-in capital ...........................  2,034,173,788
  Accumulated net realized loss on investments ......... (1,061,423,246)
  Net unrealized appreciation on investments ...........    167,594,645
                                                        ---------------
  NET ASSETS ...........................................$ 1,140,741,206
                                                        ===============
SHARES OF BENEFICIAL INTEREST:
  CLASS AAA:
  Net Asset Value, offering and redemption price per share
   ($1,139,640,553 / 39,563,277 shares outstanding;
   unlimited number of shares authorized) ..............         $28.81
                                                                 ======
  CLASS A:
  Net Asset Value and redemption price per share
   ($273,840 / 9,503 shares outstanding;
   unlimited number of shares authorized) ..............         $28.82
                                                                 ======
  Maximum offering price per share (NAV / 0.9425,
   based on maximum sales charge of 5.75%
   of the offering price) ..............................         $30.58
                                                                 ======
  CLASS B:
  Net Asset Value and offering price per share
   ($274,057 / 9,658 shares outstanding;
   unlimited number of shares authorized) ..............         $28.38(a)
                                                                 ======
  CLASS C:
  Net Asset Value and offering price per share
   ($552,756 / 19,479 shares outstanding;
   unlimited number of shares authorized) ..............         $28.38(a)
                                                                 ======
- -------------------
(a) Redemption price varies based on length of time held.

STATEMENT OF OPERATIONS
FOR THE YEAR ENDED DECEMBER 31, 2005
================================================================================
INVESTMENT INCOME:
  Dividends (net of foreign taxes of $28,307) ..........   $ 12,389,463
  Interest .............................................        574,410
                                                           ------------
  TOTAL INVESTMENT INCOME ..............................     12,963,873
                                                           ------------
EXPENSES:
  Investment advisory fees .............................     12,753,618
  Distribution fees - Class AAA ........................      3,186,483
  Distribution fees - Class A ..........................            251
  Distribution fees - Class B ..........................          2,556
  Distribution fees - Class C ..........................          4,124
  Shareholder services fees ............................      2,021,375
  Shareholder communications expenses ..................        568,909
  Custodian fees .......................................        162,746
  Legal and audit fees .................................         88,262
  Trustees' fees .......................................         69,461
  Registration fees ....................................         44,436
  Miscellaneous expenses ...............................        159,043
                                                           ------------
  TOTAL EXPENSES .......................................     19,061,264
  Less: Custodian fee credits ..........................           (593)
                                                           ------------
  NET EXPENSES .........................................     19,060,671
                                                           ------------
  NET INVESTMENT LOSS ..................................     (6,096,798)
                                                           ------------
NET REALIZED AND UNREALIZED GAIN (LOSS)
  ON INVESTMENTS:
  Net realized gain on investments .....................    117,060,872
  Net change in unrealized appreciation/
   depreciation on investments .........................      5,770,520
                                                           ------------
  NET REALIZED AND UNREALIZED GAIN (LOSS)
   ON INVESTMENTS ......................................    122,831,392
                                                           ------------
  NET INCREASE IN NET ASSETS RESULTING
    FROM OPERATIONS ....................................   $116,734,594
                                                           ============


                 See accompanying notes to financial statements.

                                       7



                              THE GAMCO GROWTH FUND


STATEMENT OF CHANGES IN NET ASSETS
================================================================================


                                                                               YEAR ENDED              YEAR ENDED
                                                                             DECEMBER 31, 2005      DECEMBER 31, 2004
                                                                             -----------------      -----------------
OPERATIONS:
                                                                                               
  Net investment loss ......................................................   $   (6,096,798)       $   (7,501,356)
  Net realized gain  on investments ........................................      117,060,872             6,104,056
  Net change in unrealized appreciation/depreciation on investments ........        5,770,520            62,086,843
                                                                               --------------        --------------
  NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS .....................      116,734,594            60,689,543
                                                                               --------------        --------------
SHARES OF BENEFICIAL INTEREST TRANSACTIONS:
     Class AAA .............................................................     (424,688,588)         (494,470,178)
     Class A ...............................................................          192,347                66,824
     Class B ...............................................................               --               242,719
     Class C ...............................................................          272,594               211,422
                                                                               --------------        --------------
  NET DECREASE IN NET ASSETS FROM SHARES OF BENEFICIAL INTEREST TRANSACTIONS     (424,223,647)         (493,949,213)
                                                                               --------------        --------------
  REDEMPTION FEES ..........................................................           25,950                 6,601
                                                                               --------------        --------------
  NET DECREASE IN NET ASSETS ...............................................     (307,463,103)         (433,253,069)
NET ASSETS:
  Beginning of period ......................................................    1,448,204,309         1,881,457,378
                                                                               --------------        --------------
  End of period (including undistributed net investment income
     of $0 and $0, respectively) ...........................................   $1,140,741,206        $1,448,204,309
                                                                               ==============        ==============


THE GAMCO GROWTH FUND
NOTES TO FINANCIAL STATEMENTS
================================================================================

1. ORGANIZATION. The GAMCO Growth Fund (the "Fund"), formerly The Gabelli Growth
Fund, was organized on October 24, 1986 as a Massachusetts  business trust.  The
Fund is a diversified  open-end  management  investment company registered under
the  Investment  Company Act of 1940,  as amended (the "1940  Act").  The Fund's
primary  objective  is  capital  appreciation.  The  Fund  commenced  investment
operations on April 10, 1987.

2. SIGNIFICANT  ACCOUNTING POLICIES.  The preparation of financial statements in
accordance  with  U.S.  generally  accepted   accounting   principles   requires
management to make estimates and  assumptions  that affect the reported  amounts
and  disclosures in the financial  statements.  Actual results could differ from
those estimates.  The following is a summary of significant  accounting policies
followed by the Fund in the preparation of its financial statements.

SECURITY  VALUATION.  Portfolio  securities  listed or  traded  on a  nationally
recognized securities exchange or traded in the U.S. over-the-counter market for
which market quotations are readily available are valued at the last quoted sale
price or a market's  official  closing  price as of the close of business on the
day the  securities  are being  valued.  If there  were no sales  that day,  the
security is valued at the  average of the  closing  bid and asked  prices or, if
there were no asked  prices  quoted on that day,  then the security is valued at
the closing bid price on that day. If no bid or asked  prices are quoted on such
day,  the  security is valued at the most  recently  available  price or, if the
Board of Trustees (the "Board") so determines, by such other method as the Board
shall  determine  in good faith,  to reflect its fair  market  value.  Portfolio
securities  traded on more than one national  securities  exchange or market are
valued according to the broadest and most  representative  market, as determined
by Gabelli Funds, LLC (the "Adviser").

Portfolio securities primarily traded on foreign markets are generally valued at
the preceding closing values of such securities on their respective exchanges or
if after the close of the foreign markets, but prior to the close of business on
the day the securities are being valued, market conditions change significantly,
certain foreign
                                       8


THE GAMCO GROWTH FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
================================================================================

securities may be fair valued  pursuant to procedures  established by the Board.
Debt  instruments  with  remaining  maturities  of 60 days or less  that are not
credit impaired are valued at amortized cost,  unless the Board  determines such
amount  does not  reflect  the  securities'  fair  value,  in which  case  these
securities  will be valued at their fair value as determined by the Board.  Debt
instruments  having a maturity greater than 60 days for which market  quotations
are  readily  available  are  valued at the  average of the latest bid and asked
prices. If there were no asked prices quoted on such day, the security is valued
using the  closing  bid  price.  Futures  contracts  are  valued at the  closing
settlement  price of the  exchange  or board  of trade on which  the  applicable
contract is traded.

Securities and assets for which market  quotations are not readily available are
valued  at their  fair  value  as  determined  in good  faith  under  procedures
established by and under the general  supervision  of the Board.  Fair valuation
methodologies  and procedures may include,  but are not limited to: analysis and
review of available  financial and non-financial  information about the company;
comparisons  to the  valuation  and changes in valuation of similar  securities,
including a comparison of foreign securities to the equivalent U.S. dollar value
ADR  securities at the close of the U.S.  exchange;  and evaluation of any other
information that could be indicative of the value of the security.

FOREIGN  SECURITIES.  The Fund  may  directly  purchase  securities  of  foreign
issuers.  Investing in securities of foreign issuers  involves special risks not
typically  associated  with investing in securities of U.S.  issuers.  The risks
include  possible  revaluation of currencies,  the ability to repatriate  funds,
less complete financial  information about companies and possible future adverse
political  and  economic  developments.  Moreover,  securities  of many  foreign
issuers and their markets may be less liquid and their prices more volatile than
those of securities of comparable U.S. issuers.

FOREIGN  TAXES.  The Fund may be subject to  foreign  taxes on income,  gains on
investments or currency repatriation, a portion of which may be recoverable. The
Fund will accrue such taxes and recoveries as applicable, based upon its current
interpretation  of tax rules and regulations  that exist in the markets in which
it invests.

SECURITIES  TRANSACTIONS  AND INVESTMENT  INCOME.  Securities  transactions  are
accounted  for on the  trade  date  with  realized  gain or loss on  investments
determined  by using the  identified  cost method.  Interest  income  (including
amortization  of premium and  accretion  of discount) is recorded on the accrual
basis.  Premiums and discounts on debt  securities are amortized using the yield
to maturity  method.  Dividend income is recorded on the ex-dividend date except
for certain  dividends which are recorded as soon as the Fund is informed of the
dividend.

DETERMINATION   OF  NET  ASSET  VALUE  AND  CALCULATION  OF  EXPENSES.   Certain
administrative  expenses are common to, and allocated among,  various affiliated
funds.  Such allocations are made on the basis of each fund's average net assets
or other criteria  directly  affecting the expenses as determined by the Adviser
pursuant to procedures established by the Board.

In  calculating  net asset value  ("NAV")  per share of each  class,  investment
income, realized and unrealized gains and losses,  redemption fees, and expenses
other than class specific expenses,  are allocated daily to each class of shares
based upon the  proportion  of net assets of each class at the beginning of each
day. Distribution expenses are borne solely by the class incurring the expense.

CUSTODIAN FEE CREDITS. When cash balances are maintained in the custody account,
the Fund receives  credits which are used to offset  custodian  fees.  The gross
expenses paid under the custody  arrangement  are included in custodian  fees in
the  Statement of  Operations  with the  corresponding  expense  offset shown as
"custodian fee credits".

                                       9


THE GAMCO GROWTH FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
================================================================================

DIVIDENDS AND  DISTRIBUTIONS  TO  SHAREHOLDERS.  Dividends and  distributions to
shareholders are recorded on the ex-dividend date. Distributions to shareholders
are based on  ordinary  income and  long-term  capital  gains as  determined  in
accordance with Federal income tax regulations, which may differ from income and
capital gains as determined under U.S. generally accepted accounting principles.
These differences are primarily due to differing  treatments of income and gains
on various  investment  securities  held by the Fund,  timing  differences,  and
differing  characterizations  of distributions  made by the Fund. These book/tax
differences  are either  temporary or  permanent in nature.  To the extent these
differences  are  permanent,  adjustments  are  made to the  appropriate  equity
accounts in the period when the differences arise. These  reclassifications have
no impact on the NAV of the Fund and the  calculation of net  investment  income
per share in the Financial  Highlights excludes these adjustments.  For the year
ended December 31, 2005, reclassifications were made to decrease accumulated net
investment  loss by  $6,096,798,  with an  offsetting  adjustment  to additional
paid-in capital.

No distributions were made in the fiscal years ended December 31, 2005 and 2004.

PROVISION  FOR  INCOME  TAXES.  The Fund  intends  to  continue  to qualify as a
regulated  investment company under Subchapter M of the Internal Revenue Code of
1986, as amended (the  "Code").  It is the policy of the Fund to comply with the
requirements  of the Code  applicable to regulated  investment  companies and to
distribute  substantially  all of its net investment  company taxable income and
net capital gains. Therefore, no provision for Federal income taxes is required.

At December 31, 2005, the difference between book basis and tax basis unrealized
appreciation  was primarily  attributable  to the tax deferral of losses on wash
sales.

As of December 31, 2005, the components of  accumulated  earnings/(losses)  on a
tax basis were as follows:

      Accumulated capital loss carryforward ................. $(1,052,343,474)
      Net unrealized appreciation ...........................     158,514,873
                                                              ---------------
      Total accumulated loss ................................ $  (893,828,601)
                                                              ===============

At December 31, 2005,  the Fund has net capital loss  carryforwards  for Federal
income tax purposes of  $1,052,343,474,  which are  available  to reduce  future
required distributions of net capital gains to shareholders. $701,151,305 of the
loss carryforward is available  through 2010;  $350,050,494 is available through
2011; and $1,141,675 is available  through 2012. For the year ended December 31,
2005 the Fund utilized capital loss carryforwards of $110,960,677.

The following  summarizes  the tax cost of  investments  and related  unrealized
appreciation/depreciation at December 31, 2005:


                                                                    GROSS            GROSS         NET UNREALIZED
                                                                 UNREALIZED       UNREALIZED        APPRECIATION/
                                                  COST          APPRECIATION     DEPRECIATION      (DEPRECIATION)
                                                  ----          ------------     ------------      --------------
                                                                                         
                  Investments ............... $985,697,488      $194,206,472     $(35,691,599)       $158,514,873


3.  INVESTMENT  ADVISORY  AGREEMENT.  The Fund has  entered  into an  investment
advisory  agreement (the "Advisory  Agreement")  with the Adviser which provides
that the Fund will pay the Adviser a fee,  computed  daily and paid monthly,  at
the  annual  rate of 1.00% of the  value of its  average  daily net  assets.  In
accordance  with the  Advisory  Agreement,  the  Adviser  provides a  continuous
investment program for the Fund's portfolio,  oversees the administration of all
aspects of the Fund's  business and affairs,  and pays the  compensation  of all
Officers and Trustees of the Fund who are affiliated persons of the Adviser.

                                       10

THE GAMCO GROWTH FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
================================================================================

4.  DISTRIBUTION  PLAN.  The Fund's Board has adopted a  distribution  plan (the
"Plan")  for each class of shares  pursuant  to Rule  12b-1  under the 1940 Act.
Gabelli & Company,  Inc.  ("Gabelli &  Company"),  an  affiliate of the Adviser,
serves as  distributor  of the Fund.  Under the Class AAA, Class A, Class B, and
Class C Share  Plans,  payments  are  authorized  to Gabelli & Company at annual
rates of 0.25%, 0.25%, 1.00%, and 1.00%, respectively,  of the average daily net
assets of those classes,  the annual  limitations under each Plan. Such payments
are accrued daily and paid monthly.

5. PORTFOLIO SECURITIES. Purchases and proceeds from the sales of securities for
the year ended December 31, 2005, other than short-term  securities,  aggregated
$493,884,741 and $925,954,385, respectively.

6.  TRANSACTIONS  WITH AFFILIATES.  During the year ended December 31, 2005, the
Fund paid brokerage commissions of $17,000 to Gabelli & Company. During the year
ended  December 31, 2005,  Gabelli & Company  informed the Fund that it received
$1,575 from investors  representing  commissions (sales charges and underwriting
fees) on sales and redemptions of Fund shares.

The cost of calculating  the Fund's NAV per share is a Fund expense  pursuant to
the Advisory  Agreement between the Fund and the Adviser.  During the year ended
December 31, 2005, the Fund  reimbursed the Adviser  $45,000 in connection  with
the cost of  computing  the  Fund's  NAV,  which is  included  in  miscellaneous
expenses in the Statement of Operations.

7. LINE OF CREDIT.  The Fund has access to an unsecured  line of credit of up to
$25,000,000  from the  custodian for temporary  borrowing  purposes.  Borrowings
under this  arrangement  bear  interest at 0.75% above the Federal Funds rate on
outstanding  balances.  During the year ended  December  31,  2005 there were no
borrowings from the line of credit.

8. SHARES OF  BENEFICIAL  INTEREST.  The Fund  currently  offers four classes of
shares -- Class AAA Shares,  Class A Shares, Class B Shares, and Class C Shares.
Class AAA Shares are offered only to investors  who acquire them  directly  from
Gabelli & Company or through  selected  broker/dealers  without a sales  charge.
Class A Shares are subject to a maximum front-end sales charge of 5.75%. Class B
Shares  are  subject  to  a  contingent  deferred  sales  charge  ("CDSC")  upon
redemption  within six years of purchase  and  automatically  convert to Class A
Shares  approximately  eight years after the original  purchase.  The applicable
CDSC is equal to a  declining  percentage  of the lesser of the NAV per share at
the date of the  original  purchase or at the date of  redemption,  based on the
length of time held.  Class C Shares are subject to a 1% CDSC for one year after
purchase.  Class B Shares are available only through  exchange of Class B Shares
of other funds distributed by Gabelli & Company.  The Board has approved Class I
Shares which have not been offered publicly.

Effective June 15, 2005, the Fund imposed a redemption fee of 2.00% on Class AAA
Shares,  Class A Shares, Class B Shares, and Class C Shares that are redeemed or
exchanged  on or before  the  seventh  day after the date of a  purchase.  (From
November 1, 2004  through June 14,  2005,  the Fund imposed a redemption  fee on
shares that were redeemed or exchanged within the sixtieth day after the date of
a purchase.) The redemption fee is deducted from the proceeds  otherwise payable
to the redeeming  shareholders  and is retained by the Fund. The redemption fees
retained by the Fund during the years ended  December  31, 2005 and December 31,
2004 amounted to $25,950 and $6,601, respectively.

                                       11

THE GAMCO GROWTH FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
================================================================================

The redemption fee does not apply to shares purchased  through programs that the
Adviser  determined to have  appropriate  short-term  trading policies in place.
Additionally,  certain recordkeepers for qualified and non-qualified  retirement
plans that could not collect the redemption fee at the participant  level due to
systems limitations have received an extension to implement such systems.

Transactions in shares of beneficial interest were as follows:


                                                              YEAR ENDED                        YEAR ENDED
                                                           DECEMBER 31, 2005                 DECEMBER 31, 2004
                                                    ----------------------------       ----------------------------
                                                       SHARES          AMOUNT            SHARES          AMOUNT
                                                    -----------    -------------       -----------    -------------
                                                               CLASS AAA                         CLASS AAA
                                                    ----------------------------       ----------------------------
                                                                                          
Shares sold .......................................   4,243,927    $ 113,064,508         7,724,349    $ 191,537,714
Shares redeemed ................................... (20,096,781)    (537,753,096)      (27,719,706)    (686,007,892)
                                                    -----------    -------------       -----------    -------------
  Net decrease .................................... (15,852,854)   $(424,688,588)      (19,995,357)   $(494,470,178)
                                                    ===========    =============       ===========    =============

                                                                CLASS A                           CLASS A
                                                    ----------------------------       ----------------------------
Shares sold .......................................       7,311    $     208,331             2,747    $      66,849
Shares redeemed ...................................        (594)         (15,984)               (1)             (25)
                                                    -----------    -------------       -----------    -------------
  Net increase ....................................       6,717    $     192,347             2,746    $      66,824
                                                    ===========    =============       ===========    =============

                                                                CLASS B                           CLASS B
                                                    ----------------------------       ----------------------------
Shares sold .......................................          --               --             9,618    $     242,719
                                                    -----------    -------------       -----------    -------------
  Net increase ....................................          --               --             9,618    $     242,719
                                                    ===========    =============       ===========    =============

                                                                CLASS C                           CLASS C
                                                    ----------------------------       ----------------------------
Shares sold .......................................      14,494    $     373,629             8,810    $     214,167
Shares redeemed ...................................      (3,750)        (101,035)             (115)          (2,745)
                                                    -----------    -------------       -----------    -------------
  Net increase ....................................      10,744    $     272,594             8,695    $     211,422
                                                    ===========    =============       ===========    =============


9.  INDEMNIFICATIONS.  The Fund enters into  contracts that contain a variety of
indemnifications.  The Fund's  maximum  exposure  under  these  arrangements  is
unknown.  However, the Fund has not had prior claims or losses pursuant to these
contracts and expects the risk of loss to be remote.

10. OTHER MATTERS.  The Adviser and/or  affiliates have received  subpoenas from
the Attorney  General of the State of New York and the  Securities  and Exchange
Commission (the "SEC")  requesting  information on mutual fund trading practices
involving  certain  funds managed by the Adviser.  GAMCO  Investors,  Inc.,  the
Adviser's  parent  company,  is responding  to these  requests for documents and
testimony.  On a separate matter, in September 2005, the Adviser was informed by
the staff of the SEC that the  staff may  recommend  to the  Commission  that an
administrative  remedy and a  monetary  penalty  be sought  from the  Adviser in
connection  with the  actions of two of seven  closed-end  funds  managed by the
Adviser  relating  to  Section  19(a)  and Rule  19a-1 of the  1940  Act.  These
provisions require registered investment companies to provide written statements
to shareholders  when a dividend is made from a source other than net investment
income. While the two closed-end funds sent annual statements and provided other
materials containing this information, the funds did not send written statements
to shareholders  with each  distribution in 2002 and 2003. The Adviser  believes
that all of the funds are now in  compliance.  The Adviser  believes  that these
matters would have no effect on the Fund or any material  adverse  effect on the
Adviser or its ability to manage the Fund.

                                       12


THE GAMCO GROWTH FUND
FINANCIAL HIGHLIGHTS
================================================================================
Selected data for a share of beneficial  interest  outstanding  throughout  each
period:


                                   INCOME
                          FROM INVESTMENT OPERATIONS                     DISTRIBUTIONS
              --------------------------------------------------  --------------------------
                                          Net
              Net Asset              Realized and       Total         Net
  Period        Value,      Net        Unrealized       from       Realized
  Ended       Beginning  Investment  Gain/(Loss) on  Investment     Gain on       Total
December 31   of Period    Loss(c)     Investments   Operations   Investments  Distributions
- -----------   ---------  ----------  --------------  ----------   -----------  -------------
                                                                 
CLASS AAA
   2005        $26.12     $(0.13)        $2.82         $2.69           --            --
   2004         24.95      (0.11)         1.28          1.17           --            --
   2003         18.99      (0.14)         6.10          5.96           --            --
   2002         28.68      (0.17)        (9.52)        (9.69)          --            --
   2001         37.79      (0.23)        (8.88)        (9.11)      $(0.00)(a)    $(0.00)(a)
CLASS A
   2005        $26.13     $(0.12)        $2.81         $2.69           --            --
   2004(b)      24.95      (0.02)         1.20          1.18           --            --
CLASS B
   2005        $25.93     $(0.32)        $2.77         $2.45           --            --
   2004(b)      24.95      (0.28)         1.26          0.98           --            --
CLASS C
   2005        $25.93     $(0.32)        $2.77         $2.45           --            --
   2004(b)      24.95      (0.21)         1.19          0.98           --            --




                                      RATIOS TO AVERAGE NET ASSETS/SUPPLEMENTAL DATA
                           -------------------------------------------------------------------------
                           Net Asset              Net Assets
  Period                     Value,                 End of          Net                      Portfolio
  Ended      Redemption      End of    Total        Period      Investment     Operating      Turnover
December 31    Fees(c)       Period   Return+     (in 000's)       Loss         Expenses        Rate
- -----------  ----------    ---------  -------     ----------    ----------     ---------     ---------
                                                                            
CLASS AAA
   2005        $0.00(a)     $28.81     10.3%      $1,139,640      (0.48)%         1.49%          39%
   2004         0.00(a)      26.12      4.7        1,447,655      (0.46)          1.53           31
   2003           --         24.95     31.4        1,881,457      (0.60)          1.47           42
   2002           --         18.99    (33.8)       1,675,816      (0.68)          1.43           30
   2001           --         28.68    (24.1)       2,948,390      (0.71)          1.40           26
CLASS A
   2005        $0.00(a)     $28.82     10.3%      $      274      (0.43)%         1.47%          39%
   2004(b)      0.00(a)      26.13      4.7               73      (0.09)          1.60           31
CLASS B
   2005        $0.00(a)     $28.38      9.5%      $      274      (1.22)%         2.24%          39%
   2004(b)      0.00(a)      25.93      3.9              250      (1.12)          2.30           31
CLASS C
   2005        $0.00(a)     $28.38      9.5%      $      553      (1.21)%         2.23%          39%
   2004(b)      0.00(a)      25.93      3.9              226      (0.88)          2.37           31


- ----------------------
  + Total return  represents  aggregate  total return of a  hypothetical  $1,000
    investment  at the beginning of the period and sold at the end of the period
    including  reinvestment of dividends and does not reflect  applicable  sales
    charges.
(a) Amount represents less than $0.005 per share.
(b) Class A, Class B, and Class C Shares were initially  offered on December 31,
    2003.
(c) Per share  amounts  have been  calculated  using the  average  shares
    outstanding method.

                 See accompanying notes to financial statements.

                                       13



THE GAMCO GROWTH FUND
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
================================================================================

To the Board of Trustees and Shareholders of
The GAMCO Growth Fund:

In our opinion, the accompanying statement of assets and liabilities,  including
the schedule of  investments,  and the related  statements of operations  and of
changes  in net assets  and the  financial  highlights  present  fairly,  in all
material  respects,  the financial  position of The GAMCO Growth Fund (hereafter
referred to as the "Fund") at December 31, 2005,  the results of its  operations
for the year then ended, the changes in its net assets for each of the two years
in the period then ended and the  financial  highlights  for each of the periods
presented,  in conformity with accounting  principles  generally accepted in the
United States of America.  These financial  statements and financial  highlights
(hereafter referred to as "financial  statements") are the responsibility of the
Fund's  management.  Our  responsibility  is to  express  an  opinion  on  these
financial  statements  based on our  audits.  We  conducted  our audits of these
financial  statements  in accordance  with the  standards of the Public  Company
Accounting Oversight Board (United States). Those standards require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements,  assessing the accounting  principles used and significant estimates
made by management, and evaluating the overall financial statement presentation.
We believe  that our  audits,  which  included  confirmation  of  securities  at
December 31, 2005 by  correspondence  with the  custodian,  provide a reasonable
basis for our opinion.


PricewaterhouseCoopers LLP
New York, New York
February 24, 2006




                                       14

THE GAMCO GROWTH FUND
ADDITIONAL FUND INFORMATION (UNAUDITED)
===============================================================================

The  business  and affairs of the Fund are managed  under the  direction  of the
Fund's Board of Trustees. Information pertaining to the Trustees and officers of
the Fund is set forth  below.  The Fund's  Statement of  Additional  Information
includes  additional  information  about The GAMCO  Growth Fund  Trustees and is
available,  without charge, upon request, by calling 800-GABELLI  (800-422-3554)
or by  writing  to The  GAMCO  Growth  Fund at One  Corporate  Center,  Rye,  NY
10580-1422.



                            TERM OF     NUMBER OF
                          OFFICE AND  FUNDS IN FUND
NAME, POSITION(S)          LENGTH OF     COMPLEX
   ADDRESS 1                 TIME      OVERSEEN BY    PRINCIPAL OCCUPATION(S)                  OTHER DIRECTORSHIPS
    AND AGE                SERVED 2      TRUSTEE      DURING PAST FIVE YEARS                    HELD BY TRUSTEE 4
- ----------------           --------    -----------    ----------------------                   --------------------
INTERESTED TRUSTEES 3:
- ---------------------
                                                                                     
MARIO J. GABELLI          Since 1992      24        Chairman of the Board and Chief Executive   Director of Morgan Group
Trustee                                             Officer of GAMCO Investors, Inc. and        Holdings, Inc.
Age: 63                                             Chief Investment Officer - Value            (holding company)
                                                    Portfolios of Gabelli Funds, LLC and GAMCO
                                                    Asset Management Inc.; Chairman and Chief
                                                    Executive Officer of Lynch Interactive
                                                    Corporation (multimedia and services)

JOHN D. GABELLI           Since 1995      10        Senior Vice President of Gabelli &          Director of GAMCO
Trustee                                             Company, Inc.                               Investors, Inc.
Age: 61

ANTHONY TORNA, SR.        Since 1987       1        Registered Representative, Maxim Group LLC          --
Age: 79                                             from 2002; Investec Ernst & Company,
                                                    2001-2002; Herzog, Heine & Geduld, Inc.
                                                    through 2000

NON-INTERESTED TRUSTEES:
- -----------------------
ANTHONY J. COLAVITA       Since 1989      34        Partner in the law firm of                          --
Trustee                                             Anthony J. Colavita, P.C.
Age: 70

JAMES P. CONN             Since 1992      14        Former Managing Director and Chief          Director of LaQuinta Corp.
Trustee                                             Investment Officer of Financial Security    (hotels) and First Republic
Age: 67                                             Assurance Holdings Ltd. (insurance          Bank (banking)
                                                    holding company) (1992-1998)

DUGALD A. FLETCHER         1989-1996       2        President, Fletcher & Company, Inc.         Director of Harris and
Trustee                   2000-present                                                          Harris Group, Inc.
Age: 76                                                                                         (venture capital)

ROBERT J. MORRISSEY       Since 2001       7        Partner in the law firm of Morrissey,             --
Trustee                                             Hawkins & Lynch
Age: 66

ANTHONY R. PUSTORINO      Since 1987      14        Certified Public Accountant; Professor      Director of Lynch Corporation
Trustee                                             Emeritus, Pace University                   (diversified manufacturing)
Age: 80



                                       15

THE GAMCO GROWTH FUND
ADDITIONAL FUND INFORMATION (UNAUDITED) (CONTINUED)
================================================================================


                            TERM OF     NUMBER OF
                          OFFICE AND  FUNDS IN FUND
NAME, POSITION(S)          LENGTH OF     COMPLEX
   ADDRESS 1                 TIME      OVERSEEN BY    PRINCIPAL OCCUPATION(S)                        OTHER DIRECTORSHIPS
    AND AGE                SERVED 2      TRUSTEE      DURING PAST FIVE YEARS                          HELD BY TRUSTEE 4
- ----------------           --------    -----------    ----------------------                         --------------------
NON-INTERESTED TRUSTEES (CONTINUED):
- -----------------------------------
                                                                                                 
ANTHONIE C. VAN EKRIS      1987-1989      18        Chairman of BALMAC International, Inc.                    --
Trustee                  1992-present               commodities and futures trading)
Age: 71

SALVATORE J. ZIZZA         1987-1996      25        Chairman of Hallmark Electrical                 Director of Hollis-Eden
Trustee                  2000-present               Supplies Corp.                                  Pharmaceuticals
Age: 60                                                                                             (biotechnology); Director
                                                                                                    of Earl Scheib, Inc.
                                                                                                    (automotive services)


OFFICERS:
- --------
BRUCE N. ALPERT           Since 1994       --       Executive Vice President and Chief Operating              --
President and Treasurer                             Officer of Gabelli Funds, LLC since 1988 and
Age: 54                                             an officer of all of the registered investment
                                                    companies in the Gabelli Funds complex.
                                                    Director and President of Gabelli Advisers, Inc.
                                                    since 1998.

JAMES E. MCKEE            Since 1995       --       Vice President, General Counsel and Secretary             --
Secretary                                           of GAMCO Investors, Inc. since 1999 and
Age: 42                                             GAMCO Asset Management Inc. since 1993;
                                                    Secretary of all of the registered investment
                                                    companies in the Gabelli Funds complex.

PETER D. GOLDSTEIN        Since 2004       --       Director of Regulatory Affairs for GAMCO Investors, Inc.  --
Chief Compliance Officer                            since 2004; Chief Compliance Officer of all of the
Age: 52                                             registered investment companies in the Gabelli Funds
                                                    complex; Vice President of Goldman Sachs Asset Management
                                                    from 2000 through 2004.

- ------------------
  1 Address: One Corporate Center, Rye, NY 10580-1422, unless otherwise noted.
  2 Each Trustee will hold office for an  indefinite  term until the earliest of
    (i) the next  meeting of  shareholders,  if any,  called for the  purpose of
    considering  the  election  or  re-election  of such  Trustee  and until the
    election and qualification of his or her successor,  if any, elected at such
    meeting,  or (ii) the date a Trustee  resigns  or  retires,  or a Trustee is
    removed by the Board of Trustees or  shareholders,  in  accordance  with the
    Fund's By-Laws and  Declaration of Trust.  Each officer will hold office for
    an indefinite  term until the date he or she resigns or retires or until his
    or her successor is elected and qualified.  Effective November 16, 2005, Mr.
    Karl  Otto  Pohl  resigned  from the  Board  of Directors and now  serves as
    Director Emeritus.
  3 "Interested  person" of the Fund as defined in the Investment Company Act of
    1940.  Messrs.  M. Gabelli and J. Gabelli are each considered an "interested
    person" because of their  affiliation  with Gabelli Funds, LLC which acts as
    the Fund's investment adviser.  Mr. Torna is considered an interested person
    because he is a registered broker with a firm to which the Fund Complex (but
    not the Fund)  pays  brokerage  commissions.  Mario J.  Gabelli  and John D.
    Gabelli are brothers.
  4 This column includes only  directorships of companies  required to report to
    the SEC under the Securities Exchange Act of 1934 (i.e. public companies) or
    other investment companies registered under the 1940 Act.

                                       16



- --------------------------------------------------------------------------------
GABELLI FUNDS AND YOUR PERSONAL PRIVACY
================================================================================

WHO ARE WE?
The Gabelli/GAMCO Funds are investment  companies registered with the Securities
and Exchange Commission under the Investment Company Act of 1940. We are managed
by Gabelli Funds,  LLC and Gabelli  Advisers,  Inc.,  which are affiliated  with
GAMCO Investors, Inc.  GAMCO Investors, Inc. is a publicly held company that has
subsidiaries  that  provide  investment  advisory or  brokerage  services  for a
variety of clients.

WHAT KIND OF  NON-PUBLIC  INFORMATION  DO WE  COLLECT  ABOUT YOU IF YOU BECOME A
GABELLI CUSTOMER?
If you apply to open an  account  directly  with us,  you will be giving us some
non-public  information  about yourself.  The non-public  information we collect
about you is:

o  INFORMATION  YOU GIVE US ON YOUR  APPLICATION  FORM.  This could include your
   name, address, telephone number, social security number, bank account number,
   and other information.

o  INFORMATION  ABOUT  YOUR  TRANSACTIONS  WITH US,  ANY  TRANSACTIONS  WITH OUR
   AFFILIATES, AND TRANSACTIONS WITH THE ENTITIES WE HIRE TO PROVIDE SERVICES TO
   YOU. This would include  information about the shares that you buy or redeem,
   and the deposits and  withdrawals  that you make.  If we hire someone else to
   provide  services--like a transfer agent--we will also have information about
   the transactions that you conduct through them.

WHAT INFORMATION DO WE DISCLOSE AND TO WHOM DO WE DISCLOSE IT?
We do not disclose any non-public  personal  information  about our customers or
former customers to anyone, other than our affiliates, our service providers who
need to know such information, and as otherwise permitted by law. If you want to
find out what the law  permits,  you can read the privacy  rules  adopted by the
Securities and Exchange Commission. They are in volume 17 of the Code of Federal
Regulations,  Part  248.  The  Commission  often  posts  information  about  its
regulations on its web site, www.sec.gov.

WHAT DO WE DO TO PROTECT YOUR PERSONAL INFORMATION?
We restrict access to non-public  personal  information  about you to the people
who need to know that  information  in order to provide  services  to you or the
Fund and to ensure that we are complying  with the laws governing the securities
business.  We maintain physical,  electronic,  and procedural safeguards to keep
your personal information confidential.
- --------------------------------------------------------------------------------


                             GABELLI FAMILY OF FUNDS

VALUE ________________________________________
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. (MULTICLASS)
                                        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 established  companies which are temporarily out of favor.  The fund's
objective  is to  identify a catalyst or sequence of events that will return the
company to a higher value.
(MULTICLASS)                              PORTFOLIO MANAGER: BARBARA MARCIN, CFA

WESTWOOD EQUITY FUND
Seeks to invest  primarily in the common stock of  well-seasoned  companies that
have  recently  reported  positive  earnings  surprises  and are  trading  below
Westwood's  proprietary  growth rate estimates.  The Fund's primary objective is
capital appreciation.
(MULTICLASS)                                   PORTFOLIO MANAGER: SUSAN M. BYRNE

FOCUSED VALUE ______________________________
GABELLI VALUE FUND
Seeks to invest in  securities  of  companies  believed to be  undervalued.  The
Fund's primary objective is long-term capital appreciation. (MULTICLASS)
                                        PORTFOLIO MANAGER: MARIO J. GABELLI, CFA

SMALL CAP VALUE ____________________________
GABELLI SMALL CAP FUND
Seeks  to  invest  primarily  in  common  stock  of  smaller  companies  (market
capitalizations  less  than $1  billion)  believed  to have  rapid  revenue  and
earnings growth potential. The Fund's primary objective is capital appreciation.
(MULTICLASS)                            PORTFOLIO MANAGER: MARIO J. GABELLI, CFA

WESTWOOD SMALLCAP EQUITY FUND
Seeks to invest primarily in smaller  capitalization  equity securities - market
caps of $2.5 billion or less. The Fund's primary  objective is long-term capital
appreciation. (MULTICLASS)                                          TEAM MANAGED

GABELLI WOODLAND SMALL CAP VALUE FUND
Seeks to invest  primarily  in the common  stocks of smaller  companies  (market
capitalizations  less  than  $1.5  billion)  believed  to  be  undervalued  with
shareholder  oriented management teams that are employing strategies to grow the
company's  value.  The  Fund's  primary   objective  is  capital   appreciation.
(MULTICLASS)                          PORTFOLIO MANAGER: ELIZABETH M. LILLY, CFA

GROWTH ______________________________________
GAMCO 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. (MULTICLASS)        PORTFOLIO MANAGER: HOWARD F. WARD, CFA

GAMCO 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. (MULTICLASS)                    PORTFOLIO MANAGER: CAESAR BRYAN

AGGRESSIVE GROWTH _________________________
GAMCO 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. (MULTICLASS)                     TEAM MANAGED

MICRO-CAP ___________________________________
WESTWOOD MIGHTY MITES(SM) 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.
(MULTICLASS)                                                        TEAM MANAGED

EQUITY INCOME _______________________________
GABELLI EQUITY INCOME FUND
Seeks to invest primarily in equity securities with above market average yields.
The Fund pays monthly  dividends  and seeks a high level of total return with an
emphasis on income. (MULTICLASS)        PORTFOLIO MANAGER: MARIO J. GABELLI, CFA

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.
(MULTICLASS)                            CO-PORTFOLIO MANAGERS: SUSAN M. BYRNE
                                                               MARK FREEMAN, CFA

WESTWOOD INCOME FUND
Seeks to  provide   a high level of  current income as well as long-term capital
appreciation  by  investing  in   income   producing  equity  and  fixed  income
securities. (MULTICLASS)                       PORTFOLIO MANAGER: SUSAN M. BYRNE

SPECIALTY EQUITY ____________________________
GAMCO 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. (MULTICLASS)                                          TEAM MANAGED

GAMCO 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.
(MULTICLASS)                                                        TEAM MANAGED

SECTOR ______________________________________
GAMCO 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. (MULTICLASS)             TEAM MANAGED

GAMCO 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. (MULTICLASS)
                                                 PORTFOLIO MANAGER: CAESAR BRYAN

GABELLI UTILITIES FUND
Seeks to provide a high level of total return  through a combination  of capital
appreciation and current income. (MULTICLASS)                       TEAM MANAGED

MERGER AND ARBITRAGE _____________________
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

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

COMSTOCK CAPITAL VALUE FUND
Seeks capital  appreciation and current income.  The Fund may use either long or
short positions to achieve its objective.
(MULTICLASS)                               PORTFOLIO MANAGER: MARTIN WEINER, CFA

COMSTOCK STRATEGY FUND
The Fund emphasizes investments in debt securities,  which maximize total return
in light of credit risk,  interest rate risk, and the risk  associated  with the
length of maturity of the debt instrument. (MULTICLASS)
                                           PORTFOLIO MANAGER: MARTIN WEINER, CFA

FIXED INCOME ________________________________
WESTWOOD INTERMEDIATE BOND FUND
Seeks to invest in a diversified portfolio of bonds with various maturities. The
Fund's primary objective is total return.
(MULTICLASS)                                PORTFOLIO MANAGER: MARK FREEMAN, CFA

CASH MANAGEMENT-MONEY MARKET __________
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

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

THE GLOBAL FUNDS INVEST IN FOREIGN SECURITIES WHICH INVOLVE RISKS NOT ORDINARILY
ASSOCIATED WITH INVESTMENTS IN DOMESTIC ISSUES,  INCLUDING CURRENCY FLUCTUATION,
ECONOMIC, AND POLITICAL RISKS.

 TO RECEIVE A PROSPECTUS, CALL 800-GABELLI (422-3554). INVESTORS SHOULD CONSIDER
THE INVESTMENT OBJECTIVES, RISKS, AND CHARGES AND EXPENSES OF THE FUND CAREFULLY
       BEFORE INVESTING. THE PROSPECTUS CONTAINS MORE COMPLETE INFORMATION
   ABOUT THIS AND OTHER MATTERS AND SHOULD BE READ CAREFULLY BEFORE INVESTING.


                              THE GAMCO GROWTH FUND
                              One Corporate Center
                            Rye, New York 10580-1422
                                   800-GABELLI
                                  800-422-3554
                                FAX: 914-921-5118
                            WEBSITE: WWW.GABELLI.COM
                            E-MAIL: INFO@GABELLI.COM
                   Net Asset Value available daily by calling
                           800-GABELLI after 6:00 P.M.

                                BOARD OF TRUSTEES
     Mario J. Gabelli, CFA                Robert J. Morrissey
     CHAIRMAN AND CHIEF                   ATTORNEY-AT-LAW
     EXECUTIVE OFFICER                    MORRISSEY, HAWKINS & LYNCH
     GAMCO INVESTORS, INC.

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

     James P. Conn                        Anthony Torna
     FORMER CHIEF INVESTMENT OFFICER      MAXIM GROUP LLC
     FINANCIAL SECURITY ASSURANCE
     HOLDINGS LTD.

     Dugald A. Fletcher                   Anthonie C. van Ekris
     PRESIDENT                            MANAGING DIRECTOR
     FLETCHER & COMPANY, INC.             BALMAC INTERNATIONAL, INC.

     John D. Gabelli                      Salvatore J. Zizza
     SENIOR VICE PRESIDENT                CHAIRMAN, HALLMARK ELECTRICAL
     GABELLI & COMPANY, INC.              SUPPLIES CORP.

                         OFFICERS AND PORTFOLIO MANAGER
     Bruce N. Alpert                      Howard F. Ward, CFA
     PRESIDENT AND TREASURER              PORTFOLIO MANAGER

     James E. McKee                       Peter D. Goldstein
     SECRETARY                            CHIEF COMPLIANCE OFFICER

                                   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
GAMCO  Growth  Fund.  It is  not  authorized  for  distribution  to  prospective
investors unless preceded or accompanied by an effective prospectus.
- --------------------------------------------------------------------------------
GAB406Q405SR





                                                                           GAMCO


                                                                     THE
                                                                     GAMCO
                                                                     GROWTH
                                                                     FUND




                                                                   ANNUAL REPORT
                                                               DECEMBER 31, 2005


ITEM 2. CODE OF ETHICS.

     (a) The registrant, as of the end of the period covered by this report, has
         adopted a code of ethics  that  applies to the  registrant's  principal
         executive officer,  principal financial officer,  principal  accounting
         officer  or  controller,   or  persons  performing  similar  functions,
         regardless of whether these  individuals are employed by the registrant
         or a third party.

     (c) There  have been no  amendments,  during  the  period  covered  by this
         report,  to a  provision  of the code of  ethics  that  applies  to the
         registrant's principal executive officer,  principal financial officer,
         principal  accounting  officer or  controller,  or  persons  performing
         similar functions, regardless of whether these individuals are employed
         by the registrant or a third party,  and that relates to any element of
         the code of ethics description.

     (d) The  registrant  has not granted  any  waivers,  including  an implicit
         waiver,  from a  provision  of the code of ethics  that  applies to the
         registrant's principal executive officer,  principal financial officer,
         principal  accounting  officer or  controller,  or  persons  performing
         similar functions, regardless of whether these individuals are employed
         by the registrant or a third party,  that relates to one or more of the
         items set forth in paragraph (b) of this item's instructions.


ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT.

As of the end of the period  covered by the report,  the  registrant's  Board of
Trustees has  determined  that Anthony R.  Pustorino is qualified to serve as an
audit committee  financial  expert serving on its audit committee and that he is
"independent," as defined by Item 3 of Form N-CSR.


ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES.

AUDIT FEES

     (a) The  aggregate  fees  billed for each of the last two fiscal  years for
         professional  services  rendered by the  principal  accountant  for the
         audit of the registrant's annual financial  statements or services that
         are normally  provided by the  accountant in connection  with statutory
         and  regulatory  filings  or  engagements  for those  fiscal  years are
         $42,829 in 2005 and $44,420 in 2004.

AUDIT-RELATED FEES

     (b) The  aggregate  fees  billed in each of the last two  fiscal  years for
         assurance  and related  services by the principal  accountant  that are
         reasonably  related to the performance of the audit of the registrant's
         financial  statements and are not reported under  paragraph (a) of this
         Item are $0 in 2005 and $0 in 2004.

TAX FEES

     (c) The  aggregate  fees  billed in each of the last two  fiscal  years for
         professional  services  rendered by the  principal  accountant  for tax
         compliance,  tax advice, and tax planning are $2,880 in 2005 and $2,550
         in 2004.

         Tax fees represent tax compliance  services provided in connection with
         the review of the Registrant's tax returns.

ALL OTHER FEES

     (d) The  aggregate  fees  billed in each of the last two  fiscal  years for
         products and services provided by the principal accountant,  other than
         the services reported in paragraphs (a) through (c) of this Item are $0
         in 2005 and $0 in 2004.

  (e)(1) Disclose the  audit  committee's   pre-approval policies and procedures
         described in paragraph (c)(7) of Rule 2-01 of Regulation S-X.

         Pre-Approval Policies and Procedures. The Audit Committee ("Committee")
         of the registrant is responsible  for  pre-approving  (i) all audit and
         permissible  non-audit  services  to be  provided  by  the  independent
         auditors to the registrant and (ii) all permissible  non-audit services
         to be provided by the  independent  auditors  to the  Adviser,  Gabelli
         Funds,  LLC, and any affiliate of Gabelli Funds,  LLC ("Gabelli")  that
         provides services to the registrant (a "Covered Services  Provider") if
         the independent auditors' engagement related directly to the operations
         and financial  reporting of the registrant.  The Committee may delegate
         its  responsibility  to  pre-approve  any such  audit  and  permissible
         non-audit  services  to the  Chairperson  of  the  Committee,  and  the
         Chairperson  must  report  to  the  Committee,  at its  next  regularly
         scheduled  meeting  after  the   Chairperson's   pre-approval  of  such
         services,  his or her  decision(s).  The Committee  may also  establish
         detailed  pre-approval policies and procedures for pre-approval of such
         services in accordance with applicable  laws,  including the delegation
         of some or all of the Committee's pre-approval  responsibilities to the
         other  persons  (other  than  Gabelli  or the  registrant's  officers).
         Pre-approval by the Committee of any permissible  non-audit services is
         not  required  so  long  as:  (i)  the  aggregate  amount  of all  such
         permissible non-audit services provided to the registrant,  Gabelli and
         any Covered Services Provider constitutes not more than 5% of the total
         amount of revenues paid by the registrant to its  independent  auditors
         during the fiscal year in which the permissible  non-audit services are
         provided;  (ii) the permissible  non-audit services were not recognized
         by  the  registrant  at the  time  of the  engagement  to be  non-audit
         services; and (iii) such services are promptly brought to the attention
         of the Committee and approved by the Committee or Chairperson  prior to
         the completion of the audit.

  (e)(2) The  percentage  of  services  described  in  each  of  paragraphs  (b)
         through  (d) of this  Item that were  approved  by the audit  committee
         pursuant to paragraph  (c)(7)(i)(C)  of Rule 2-01 of Regulation S-X are
         as follows:

                           (b) N/A

                           (c) 100%

                           (d) N/A

     (f) The  percentage  of  hours  expended  on  the  principal   accountant's
         engagement to audit the registrant's  financial statements for the most
         recent fiscal year that were  attributed  to work  performed by persons
         other than the principal  accountant's  full-time,  permanent employees
         was zero percent (0%).

     (g) The aggregate non-audit fees billed by the registrant's  accountant for
         services  rendered to the registrant,  and rendered to the registrant's
         investment  adviser  (not  including  any  sub-adviser  whose  role  is
         primarily portfolio management and is subcontracted with or overseen by
         another investment adviser), and any entity controlling, controlled by,
         or under common control with the adviser that provides ongoing services
         to the  registrant  for  each  of the  last  two  fiscal  years  of the
         registrant was $0 in 2005 and $0 in 2004.

     (h) The  registrant's  audit  committee  of  the  board  of  directors  has
         considered  whether  the  provision  of  non-audit  services  that were
         rendered to the  registrant's  investment  adviser (not  including  any
         sub-adviser  whose  role  is  primarily  portfolio  management  and  is
         subcontracted with or overseen by another investment adviser),  and any
         entity  controlling,  controlled  by, or under common  control with the
         investment  adviser that provides  ongoing  services to the  registrant
         that were not  pre-approved  pursuant to paragraph  (c)(7)(ii)  of Rule
         2-01 of Regulation  S-X is compatible  with  maintaining  the principal
         accountant's independence.

ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS.

Not applicable.



ITEM 6. SCHEDULE OF INVESTMENTS.

Schedule of Investments in securities of unaffiliated issuers as of the close of
the  reporting  period is included as part of the report to  shareholders  filed
under Item 1 of this form.



ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END
        MANAGEMENT INVESTMENT COMPANIES.

Not applicable.



ITEM 8. PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES.

Not applicable.



ITEM 9. PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT
        COMPANY AND AFFILIATED PURCHASERS.

Not applicable.



ITEM 10. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

There have been no material  changes to the procedures by which the shareholders
may  recommend  nominees  to the  registrant's  Board of  Trustees,  where those
changes were  implemented  after the  registrant  last  provided  disclosure  in
response to the  requirements  of Item  7(d)(2)(ii)(G)  of Schedule  14A (17 CFR
240.14a-101), or this Item.


ITEM 11. CONTROLS AND PROCEDURES.

     (a) The registrant's  principal executive and principal financial officers,
         or  persons  performing  similar  functions,  have  concluded  that the
         registrant's  disclosure  controls and  procedures  (as defined in Rule
         30a-3(c)  under the  Investment  Company Act of 1940,  as amended  (the
         "1940 Act") (17 CFR 270.30a-3(c)))  are effective,  as of a date within
         90 days of the filing date of the report that  includes the  disclosure
         required by this paragraph, based on their evaluation of these controls
         and  procedures  required by Rule  30a-3(b)  under the 1940 Act (17 CFR
         270.30a-3(b))  and Rules  13a-15(b) or 15d-15(b)  under the  Securities
         Exchange   Act  of  1934,   as  amended   (17  CFR   240.13a-15(b)   or
         240.15d-15(b)).


     (b) There  were  no  changes  in the  registrant's  internal  control  over
         financial reporting (as defined in Rule 30a-3(d) under the 1940 Act (17
         CFR 270.30a-3(d))  that occurred during the registrant's  second fiscal
         quarter  of the  period  covered  by this  report  that has  materially
         affected,   or  is  reasonably   likely  to  materially   affect,   the
         registrant's internal control over financial reporting.


ITEM 12. EXHIBITS.

     (a)(1)   Code of ethics, or any amendment  thereto,  that is the subject of
              disclosure required by Item 2 is attached hereto.

     (a)(2)   Certifications  pursuant to Rule  30a-2(a)  under the 1940 Act and
              Section 302 of the Sarbanes-Oxley Act of 2002 are attached hereto.

     (a)(3)   Not applicable.

     (b)      Certifications  pursuant to Rule  30a-2(b)  under the 1940 Act and
              Section 906 of the Sarbanes-Oxley Act of 2002 are attached hereto.






                                   SIGNATURES

Pursuant to the  requirements  of the  Securities  Exchange  Act of 1934 and the
Investment Company Act of 1940, the registrant has duly caused this report to be
signed on its behalf by the undersigned, thereunto duly authorized.

(registrant) The GAMCO Growth Fund
             -------------------------------------------------------------------

By (Signature and Title)*  /s/ Bruce N. Alpert
                         -------------------------------------------------------
                           Bruce N. Alpert, Principal Executive Officer

Date     March 10, 2006
    ----------------------------------------------------------------------------


Pursuant to the  requirements  of the  Securities  Exchange  Act of 1934 and the
Investment  Company  Act of  1940,  this  report  has been  signed  below by the
following  persons on behalf of the  registrant and in the capacities and on the
dates indicated.


By (Signature and Title)*  /s/ Bruce N. Alpert
                         -------------------------------------------------------
                           Bruce N. Alpert,
                           Principal Executive Officer & Principal
                           Financial Officer

Date     March 10, 2006
    ----------------------------------------------------------------------------



* Print the name and title of each signing officer under his or her signature.