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

                                    Form 13F

                               Form 13F COVER PAGE


Report for the Calendar Year or Quarter Ended:  December 31, 2005
                                                ------------------

Check here if Amendment [ ]; Amendment Number:              
                                                  ------------
  This Amendment (Check only one.): [ ]  is a restatement.
                                    [ ]  adds new holdings entries.


Institutional Investment Manager Filing this Report:

Name:     Hennessy Advisors, Inc.
Address:  The Courtyard Square
          750 Grant Avenue, Suite 100
          Novato, CA  94945

Form 13F File Number:  028-06715

The institutional investment manager filing this report and the person by whom
it is signed hereby represent that the person signing the report is authorized
to submit it, that all information contained herein is true, correct and
complete, and that it is understood that all required items, statements,
schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:

Name:     Teresa M. Nilsen
Title:    Executive Vice President and Chief Financial Officer
Phone:    (415) 899-1555

Signature, Place, and Date of Signing:


/s/ Teresa M. Nilsen                  Novato, CA                January 17, 2006
--------------------------------------------------------------------------------
Teresa M. Nilsen                      City, State                      Date


Report Type  (Check only one):

[X]  13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager
     are reported in this report.)

[ ]  13F NOTICE. (Check here if no holdings reported are in this report, and all
     holdings are reported by other reporting manager(s).)

[ ]  13F COMBINATION REPORT. (Check here if a portion of the holdings for this
     reporting manager are reported in this report and a portion are reported by
     other reporting manager(s).)






                              FORM 13F SUMMARY PAGE



Report Summary:


Number of Other Included Managers:                              0
                                                 ----------------------

Form 13F Information Table Entry Total:                       172
                                                 ----------------------

Form 13F Information Table Value Total:                $1,792,142
                                                 ----------------------
                                                       (thousands)



List of Other Included Managers:  NONE







Page 1 of 9


                                                     FORM 13F INFORMATION TABLE

                                         Name of Reporting Manager: Hennessy Advisors, Inc.

                                                                                                    Column
      Column 1:         Column 2:    Column 3:   Column 4:    Column 5:              Column 6:         7:         Column 8:
----------------------------------------------------------------------------------------------------------------------------------
                          Title                   Market                                           
                           of         CUSIP       Value       Shares or                              Other
    Name of Issuer        Class       Number    (x$1,000)  Principal Amount  Investment Discretion   Mgrs.    Voting Authority
----------------------------------------------------------------------------------------------------------------------------------
                                                                   SH/ Put/        Shared   Shared     
                                                                   PRN Call  Sole  Defined   Other         Sole    Shared  None
----------------------------------------------------------------------------------------------------------------------------------
                                                                                            
------------------------------------------------------------------------------------------------------------------------------------
A T & T INC               COMMON     00206R102      12,216   498,830 SH      SOLE                            490,029          8,801
------------------------------------------------------------------------------------------------------------------------------------
ADVANCE AUTO PARTS INC    COMMON     00751Y106       4,702   108,200 SH      SOLE                            108,200              0
------------------------------------------------------------------------------------------------------------------------------------
AETNA INC                 COMMON     00817Y108      34,914   370,200 SH      SOLE                            370,200              0
------------------------------------------------------------------------------------------------------------------------------------
AK STEEL HOLDING CORP     COMMON     001547108      10,760 1,353,500 SH      SOLE                          1,353,500              0
------------------------------------------------------------------------------------------------------------------------------------
ALBERTSONS INC            COMMON     013104104       3,288   154,000 SH      SOLE                            154,000              0
------------------------------------------------------------------------------------------------------------------------------------
ALLEGHENY TECHNOLOGIES 
INC                       COMMON     01741R102       5,701   158,000 SH      SOLE                            158,000              0
------------------------------------------------------------------------------------------------------------------------------------
ALLIANCE IMAGING INC      COMMON     018606202      10,187 1,712,100 SH      SOLE                          1,712,100              0
------------------------------------------------------------------------------------------------------------------------------------
ALTRIA GROUP INC          COMMON     02209S103      12,151   162,615 SH      SOLE                            162,175            440
------------------------------------------------------------------------------------------------------------------------------------
AMERCO                    COMMON     023586100       6,261    86,900 SH      SOLE                             86,900              0
------------------------------------------------------------------------------------------------------------------------------------
AMERIGROUP CORP           COMMON     03073T102      10,074   517,700 SH      SOLE                            517,700              0
------------------------------------------------------------------------------------------------------------------------------------
ANDERSONS INC             COMMON     034164103       5,876   136,400 SH      SOLE                            136,400              0
------------------------------------------------------------------------------------------------------------------------------------
BADGER METER INC          COMMON     056525108       4,481   114,200 SH      SOLE                            114,200              0
------------------------------------------------------------------------------------------------------------------------------------
BANK OF AMERICA CORP      COMMON     060505104       4,216    91,351 SH      SOLE                             77,800         13,551
------------------------------------------------------------------------------------------------------------------------------------
BELLSOUTH CORP            COMMON     079860102       3,605   133,038 SH      SOLE                            129,300          3,738
------------------------------------------------------------------------------------------------------------------------------------
BLACK & DECKER CORP       COMMON     091797100      19,279   221,700 SH      SOLE                            221,700              0
------------------------------------------------------------------------------------------------------------------------------------
BLOUNT INTL INC           COMMON     095180105      17,910 1,124,300 SH      SOLE                          1,124,300              0
------------------------------------------------------------------------------------------------------------------------------------
BLUEGREEN CORP            COMMON     096231105      15,606   987,700 SH      SOLE                            987,700              0
------------------------------------------------------------------------------------------------------------------------------------
BP PLC  -ADS               ADR       055622104       3,833    59,688 SH      SOLE                             53,200          6,488
------------------------------------------------------------------------------------------------------------------------------------
BRINKS CO                 COMMON     109696104      23,744   495,600 SH      SOLE                            495,600              0
------------------------------------------------------------------------------------------------------------------------------------
BRISTOL MYERS SQUIBB      COMMON     110122108       3,849   167,500 SH      SOLE                            166,700            800
------------------------------------------------------------------------------------------------------------------------------------
BUILDING MATERIALS HLDG 
CP                        COMMON     120113105      38,443   563,600 SH      SOLE                            563,600              0
------------------------------------------------------------------------------------------------------------------------------------





Page 2 of 9


                                                     FORM 13F INFORMATION TABLE

                                         Name of Reporting Manager: Hennessy Advisors, Inc.

                                                                                                    Column
      Column 1:         Column 2:    Column 3:   Column 4:    Column 5:              Column 6:         7:         Column 8:
----------------------------------------------------------------------------------------------------------------------------------
                          Title                   Market                                           
                           of         CUSIP       Value       Shares or                              Other
    Name of Issuer        Class       Number    (x$1,000)  Principal Amount  Investment Discretion   Mgrs.    Voting Authority
----------------------------------------------------------------------------------------------------------------------------------
                                                                   SH/ Put/        Shared   Shared     
                                                                   PRN Call  Sole  Defined   Other         Sole    Shared  None
----------------------------------------------------------------------------------------------------------------------------------
                                                                                            
BUNGE LTD                 COMMON     G16962105      19,446   343,500 SH      SOLE                            343,500              0
------------------------------------------------------------------------------------------------------------------------------------
BURLINGTON COAT FACTORY 
WRHS                      COMMON     121579106       4,351   108,200 SH      SOLE                            108,200              0
------------------------------------------------------------------------------------------------------------------------------------
CARPENTER TECHNOLOGY CORP COMMON     144285103      23,607   335,000 SH      SOLE                            335,000              0
------------------------------------------------------------------------------------------------------------------------------------
CB RICHARD ELLIS GROUP 
INC                       COMMON     12497T101      12,994   220,800 SH      SOLE                            210,800         10,000
------------------------------------------------------------------------------------------------------------------------------------
CENTENE CORP              COMMON     15135B101      18,161   690,800 SH      SOLE                            690,800              0
------------------------------------------------------------------------------------------------------------------------------------
CHAMPION ENTERPRISES INC  COMMON     158496109      22,568 1,657,000 SH      SOLE                          1,657,000              0
------------------------------------------------------------------------------------------------------------------------------------
CHAPARRAL STEEL CO        COMMON     159423102       9,499   314,000 SH      SOLE                            314,000              0
------------------------------------------------------------------------------------------------------------------------------------
CHEMED CORP               COMMON     16359R103       5,534   111,400 SH      SOLE                            111,400              0
------------------------------------------------------------------------------------------------------------------------------------
CHEVRONTEXACO CORP        COMMON     166764100       4,355    76,707 SH      SOLE                             60,700         16,007
------------------------------------------------------------------------------------------------------------------------------------
CHILDRENS PLACE RETAIL 
STRS                      COMMON     168905107       5,575   112,800 SH      SOLE                            112,800              0
------------------------------------------------------------------------------------------------------------------------------------
CHUNGHWA TELECOM CO        ADR       17133Q205       3,701   201,700 SH      SOLE                            201,700              0
------------------------------------------------------------------------------------------------------------------------------------
CITIGROUP INC             COMMON     172967101      11,454   236,025 SH      SOLE                            236,025              0
------------------------------------------------------------------------------------------------------------------------------------
CLEAN HARBORS INC         COMMON     184496107       3,319   115,200 SH      SOLE                            115,200              0
------------------------------------------------------------------------------------------------------------------------------------
CLEVELAND-CLIFFS INC      COMMON     185896107      38,333   432,800 SH      SOLE                            432,800              0
------------------------------------------------------------------------------------------------------------------------------------
CMS ENERGY CORP           COMMON     125896100       4,321   297,800 SH      SOLE                            297,800              0
------------------------------------------------------------------------------------------------------------------------------------
COCA-COLA COMPANY         COMMON     191216100       5,174   128,350 SH      SOLE                            128,350              0
------------------------------------------------------------------------------------------------------------------------------------
COMMERCIAL METALS         COMMON     201723103      34,646   922,900 SH      SOLE                            922,900              0
------------------------------------------------------------------------------------------------------------------------------------
CONAGRA FOODS INC         COMMON     205887102       3,598   177,400 SH      SOLE                            177,400              0
------------------------------------------------------------------------------------------------------------------------------------
CONSOL ENERGY INC         COMMON     20854P109      31,097   477,100 SH      SOLE                            477,100              0
------------------------------------------------------------------------------------------------------------------------------------
DAIMLERCHRYSLER AG         ADR       sedol - 
                                     2307389         3,557    69,700 SH      SOLE                             69,700              0
------------------------------------------------------------------------------------------------------------------------------------
DENNYS CORP               COMMON     24869P104       3,468   860,600 SH      SOLE                            860,600              0
------------------------------------------------------------------------------------------------------------------------------------





Page 3 of 9


                                                     FORM 13F INFORMATION TABLE

                                         Name of Reporting Manager: Hennessy Advisors, Inc.

                                                                                                    Column
      Column 1:         Column 2:    Column 3:   Column 4:    Column 5:              Column 6:         7:         Column 8:
----------------------------------------------------------------------------------------------------------------------------------
                          Title                   Market                                           
                           of         CUSIP       Value       Shares or                              Other
    Name of Issuer        Class       Number    (x$1,000)  Principal Amount  Investment Discretion   Mgrs.    Voting Authority
----------------------------------------------------------------------------------------------------------------------------------
                                                                   SH/ Put/        Shared   Shared     
                                                                   PRN Call  Sole  Defined   Other         Sole    Shared  None
----------------------------------------------------------------------------------------------------------------------------------
                                                                                            
DIAGEO PLC                 ADR       25243Q205       3,492    59,900 SH      SOLE                             59,900              0
------------------------------------------------------------------------------------------------------------------------------------
DONNELLEY (R R) & SONS CO COMMON     257867101       3,561   104,100 SH      SOLE                            104,100              0
------------------------------------------------------------------------------------------------------------------------------------
DOW CHEMICAL              COMMON     260543103       3,506    80,000 SH      SOLE                             80,000              0
------------------------------------------------------------------------------------------------------------------------------------
DU PONT (E I) DE NEMOURS  COMMON     263534109      10,889   256,200 SH      SOLE                            255,650            550
------------------------------------------------------------------------------------------------------------------------------------
EMERSON ELECTRIC          COMMON     291011104       1,535    20,550 SH      SOLE                                  0         20,550
------------------------------------------------------------------------------------------------------------------------------------
EXPRESS SCRIPTS INC       COMMON     302182100       6,612    78,900 SH      SOLE                             78,900              0
------------------------------------------------------------------------------------------------------------------------------------
EXXON MOBIL CORPORATION   COMMON     30231G102       1,196    21,293 SH      SOLE                             14,200          7,093
------------------------------------------------------------------------------------------------------------------------------------
FEDERAL HOME LOAN MORTG 
CORP                      COMMON     313400301       3,679    56,300 SH      SOLE                             56,300              0
------------------------------------------------------------------------------------------------------------------------------------
FLOWSERVE CORP            COMMON     34354P105       5,455   137,900 SH      SOLE                            137,900              0
------------------------------------------------------------------------------------------------------------------------------------
FORD MOTOR CO             COMMON     345370860       3,372   436,746 SH      SOLE                            436,500            246
------------------------------------------------------------------------------------------------------------------------------------
FRONTIER OIL CORP         COMMON     35914P105       9,611   256,100 SH      SOLE                            256,100              0
------------------------------------------------------------------------------------------------------------------------------------
GEHL CO                   COMMON     368483103       4,707   179,300 SH      SOLE                            179,300              0
------------------------------------------------------------------------------------------------------------------------------------
GENERAL ELECTRIC CO.      COMMON     369604103       2,225    63,475 SH      SOLE                             62,250          1,225
------------------------------------------------------------------------------------------------------------------------------------
GENERAL MOTORS CORP       COMMON     370442105       7,956   409,657 SH      SOLE                            408,900            757
------------------------------------------------------------------------------------------------------------------------------------
GENESCO INC               COMMON     371532102      29,127   750,900 SH      SOLE                            750,900              0
------------------------------------------------------------------------------------------------------------------------------------
GEORGIA GULF CORP         COMMON     373200203      11,964   393,300 SH      SOLE                            393,300              0
------------------------------------------------------------------------------------------------------------------------------------
GLAXOSMITHKLINE PLC        ADR       37733W105       3,559    70,500 SH      SOLE                             70,500              0
------------------------------------------------------------------------------------------------------------------------------------
GOODYEAR TIRE & RUBBER CO COMMON     382550101       5,414   311,500 SH      SOLE                            311,500              0
------------------------------------------------------------------------------------------------------------------------------------
GRACE (W R) & CO          COMMON     38388F108      13,527 1,439,000 SH      SOLE                          1,439,000              0
------------------------------------------------------------------------------------------------------------------------------------
GREAT ATLANTIC & PAC TEA 
CO                        COMMON     390064103       5,221   164,300 SH      SOLE                            164,300              0
------------------------------------------------------------------------------------------------------------------------------------
GREENBRIER COMPANIES INC  COMMON     393657101      16,432   578,600 SH      SOLE                            578,600              0
------------------------------------------------------------------------------------------------------------------------------------





Page 4 of 9


                                                     FORM 13F INFORMATION TABLE

                                         Name of Reporting Manager: Hennessy Advisors, Inc.

                                                                                                    Column
      Column 1:         Column 2:    Column 3:   Column 4:    Column 5:              Column 6:         7:         Column 8:
----------------------------------------------------------------------------------------------------------------------------------
                          Title                   Market                                           
                           of         CUSIP       Value       Shares or                              Other
    Name of Issuer        Class       Number    (x$1,000)  Principal Amount  Investment Discretion   Mgrs.    Voting Authority
----------------------------------------------------------------------------------------------------------------------------------
                                                                   SH/ Put/        Shared   Shared     
                                                                   PRN Call  Sole  Defined   Other         Sole    Shared  None
----------------------------------------------------------------------------------------------------------------------------------
                                                                                            
HEALTHCARE SERVICES GROUP COMMON     421906108       4,784   231,000 SH      SOLE                            231,000              0
------------------------------------------------------------------------------------------------------------------------------------
HEINZ (H J) CO            COMMON     423074103       3,500   103,800 SH      SOLE                            103,800              0
------------------------------------------------------------------------------------------------------------------------------------
HENNESSY ADVISORS INC     COMMON     425885100      31,951 1,265,368 SH      SOLE                                  0      1,265,368
------------------------------------------------------------------------------------------------------------------------------------
HEXCEL CORP               COMMON     428291108      24,380 1,350,700 SH      SOLE                          1,350,700              0
------------------------------------------------------------------------------------------------------------------------------------
HOLLY CORP                COMMON     435758305      10,379   176,300 SH      SOLE                            176,300              0
------------------------------------------------------------------------------------------------------------------------------------
HOVNANIAN ENTRPRS INC  
-CL A                     COMMON     442487203       3,564    71,800 SH      SOLE                             71,800              0
------------------------------------------------------------------------------------------------------------------------------------
HSBC HOLDINGS PLC          ADR       404280406       3,573    44,400 SH      SOLE                             44,400              0
------------------------------------------------------------------------------------------------------------------------------------
HUMANA INC                COMMON     444859102      11,811   217,400 SH      SOLE                            217,400              0
------------------------------------------------------------------------------------------------------------------------------------
HUNT (JB) TRANSPRT SVCS 
INC                       COMMON     445658107      19,774   873,400 SH      SOLE                            873,400              0
------------------------------------------------------------------------------------------------------------------------------------
ING GROEP NV               ADR       456837103       3,663   105,200 SH      SOLE                            105,200              0
------------------------------------------------------------------------------------------------------------------------------------
INTL PAPER CO             COMMON     460146103       3,684   109,625 SH      SOLE                            108,750            875
------------------------------------------------------------------------------------------------------------------------------------
IPSCO INC                  ADR       462622101      33,997   409,700 SH      SOLE                            409,700              0
------------------------------------------------------------------------------------------------------------------------------------
J P MORGAN CHASE & CO     COMMON     46625H100      11,978   301,795 SH      SOLE                            300,950            845
------------------------------------------------------------------------------------------------------------------------------------
JACOBS ENGINEERING GROUP 
INC                       COMMON     469814107       4,907    72,300 SH      SOLE                             72,300              0
------------------------------------------------------------------------------------------------------------------------------------
JLG INDUSTRIES INC        COMMON     466210101      14,292   313,000 SH      SOLE                            313,000              0
------------------------------------------------------------------------------------------------------------------------------------
JONES LANG LASALLE INC    COMMON     48020Q107      26,358   523,500 SH      SOLE                            523,500              0
------------------------------------------------------------------------------------------------------------------------------------
KB HOME                   COMMON     48666K109       4,585    63,100 SH      SOLE                             63,100              0
------------------------------------------------------------------------------------------------------------------------------------
KIMBERLY-CLARK CORP       COMMON     494368103       3,724    62,426 SH      SOLE                             61,300          1,126
------------------------------------------------------------------------------------------------------------------------------------
KRAFT FOODS INC           COMMON     50075N104       3,439   122,200 SH      SOLE                            122,200              0
------------------------------------------------------------------------------------------------------------------------------------
LABOR READY INC           COMMON     505401208       3,902   187,400 SH      SOLE                            187,400              0
------------------------------------------------------------------------------------------------------------------------------------
LANDSTAR SYSTEM INC       COMMON     515098101      22,202   531,900 SH      SOLE                            531,900              0
------------------------------------------------------------------------------------------------------------------------------------





Page 5 of 9


                                                     FORM 13F INFORMATION TABLE

                                         Name of Reporting Manager: Hennessy Advisors, Inc.

                                                                                                    Column
      Column 1:         Column 2:    Column 3:   Column 4:    Column 5:              Column 6:         7:         Column 8:
----------------------------------------------------------------------------------------------------------------------------------
                          Title                   Market                                           
                           of         CUSIP       Value       Shares or                              Other
    Name of Issuer        Class       Number    (x$1,000)  Principal Amount  Investment Discretion   Mgrs.    Voting Authority
----------------------------------------------------------------------------------------------------------------------------------
                                                                   SH/ Put/        Shared   Shared     
                                                                   PRN Call  Sole  Defined   Other         Sole    Shared  None
----------------------------------------------------------------------------------------------------------------------------------
                                                                                            
LENNOX INTERNATIONAL INC  COMMON     526107107       5,161   183,000 SH      SOLE                            183,000              0
------------------------------------------------------------------------------------------------------------------------------------
LILLY (ELI) & CO          COMMON     532457108       3,780    66,800 SH      SOLE                             66,800              0
------------------------------------------------------------------------------------------------------------------------------------
LINCOLN NATIONAL CORP     COMMON     534187109       3,664    69,100 SH      SOLE                             69,100              0
------------------------------------------------------------------------------------------------------------------------------------
LONGS DRUG STORES CORP    COMMON     543162101       3,916   107,600 SH      SOLE                            107,600              0
------------------------------------------------------------------------------------------------------------------------------------
LUBYS INC                 COMMON     549282101       5,143   386,700 SH      SOLE                            386,700              0
------------------------------------------------------------------------------------------------------------------------------------
LUFKIN INDUSTRIES INC     COMMON     549764108       6,373   127,800 SH      SOLE                            127,800              0
------------------------------------------------------------------------------------------------------------------------------------
LYONDELL CHEMICAL CO      COMMON     552078107      19,535   820,100 SH      SOLE                            820,100              0
------------------------------------------------------------------------------------------------------------------------------------
MATTEL INC                COMMON     577081102       3,423   216,400 SH      SOLE                            216,400              0
------------------------------------------------------------------------------------------------------------------------------------
MCDERMOTT INTL INC        COMMON     580037109      53,470 1,198,600 SH      SOLE                          1,198,600              0
------------------------------------------------------------------------------------------------------------------------------------
MEADWESTVACO CORP         COMMON     583334107       3,549   126,600 SH      SOLE                            126,600              0
------------------------------------------------------------------------------------------------------------------------------------
MENS WEARHOUSE INC        COMMON     587118100       3,948   134,100 SH      SOLE                            134,100              0
------------------------------------------------------------------------------------------------------------------------------------
MERCK & CO                COMMON     589331107      11,577   363,939 SH      SOLE                            363,250            689
------------------------------------------------------------------------------------------------------------------------------------
MERITAGE HOMES CORP       COMMON     59001A102      25,552   406,100 SH      SOLE                            406,100              0
------------------------------------------------------------------------------------------------------------------------------------
MOLINA HEALTHCARE INC     COMMON     60855R100      11,250   422,300 SH      SOLE                            422,300              0
------------------------------------------------------------------------------------------------------------------------------------
MULTI-FINELINE ELECTRON 
INC                       COMMON     62541B101      12,168   252,600 SH      SOLE                            252,600              0
------------------------------------------------------------------------------------------------------------------------------------
NATIONAL CITY CORP        COMMON     635405103       3,491   104,000 SH      SOLE                            104,000              0
------------------------------------------------------------------------------------------------------------------------------------
NCR CORP                  COMMON     62886E108      19,204   565,832 SH      SOLE                            565,800             32
------------------------------------------------------------------------------------------------------------------------------------
NOVA CHEMICALS CORP        ADR       66977W109      13,831   414,100 SH      SOLE                            414,100              0
------------------------------------------------------------------------------------------------------------------------------------
NOVAMERICAN STEEL INC      ADR       669959108      13,554   344,350 SH      SOLE                            344,350              0
------------------------------------------------------------------------------------------------------------------------------------
NS GROUP, INC.            COMMON     628916108       5,841   139,700 SH      SOLE                            139,700              0
------------------------------------------------------------------------------------------------------------------------------------
NUCOR CORP                COMMON     670346105      24,967   374,200 SH      SOLE                            374,200              0
------------------------------------------------------------------------------------------------------------------------------------





Page 6 of 9


                                                     FORM 13F INFORMATION TABLE

                                         Name of Reporting Manager: Hennessy Advisors, Inc.

                                                                                                    Column
      Column 1:         Column 2:    Column 3:   Column 4:    Column 5:              Column 6:         7:         Column 8:
----------------------------------------------------------------------------------------------------------------------------------
                          Title                   Market                                           
                           of         CUSIP       Value       Shares or                              Other
    Name of Issuer        Class       Number    (x$1,000)  Principal Amount  Investment Discretion   Mgrs.    Voting Authority
----------------------------------------------------------------------------------------------------------------------------------
                                                                   SH/ Put/        Shared   Shared     
                                                                   PRN Call  Sole  Defined   Other         Sole    Shared  None
----------------------------------------------------------------------------------------------------------------------------------
                                                                                            
NVR INC                   COMMON     62944T105      17,901    25,500 SH      SOLE                             25,500              0
------------------------------------------------------------------------------------------------------------------------------------
OFFICE DEPOT INC          COMMON     676220106       5,121   163,100 SH      SOLE                            163,100              0
------------------------------------------------------------------------------------------------------------------------------------
OIL STATES INTL INC       COMMON     678026105       4,442   140,200 SH      SOLE                            140,200              0
------------------------------------------------------------------------------------------------------------------------------------
OLD DOMINION FREIGHT      COMMON     679580100      22,760   844,200 SH      SOLE                            844,200              0
------------------------------------------------------------------------------------------------------------------------------------
OREGON STEEL MILLS INC    COMMON     686079104      28,399   965,300 SH      SOLE                            965,300              0
------------------------------------------------------------------------------------------------------------------------------------
P G & E CORP              COMMON     69331C108         223     6,005 SH      SOLE                                  0          6,005
------------------------------------------------------------------------------------------------------------------------------------
PANTRY INC                COMMON     698657103       5,479   116,600 SH      SOLE                            116,600              0
------------------------------------------------------------------------------------------------------------------------------------
PAR TECHNOLOGY CORP       COMMON     698884103       4,361   157,100 SH      SOLE                            157,100              0
------------------------------------------------------------------------------------------------------------------------------------
PFIZER INC                COMMON     717081103      10,347   443,675 SH      SOLE                            441,575          2,100
------------------------------------------------------------------------------------------------------------------------------------
PHILLIPS-VAN HEUSEN CORP  COMMON     718592108       4,530   139,800 SH      SOLE                            139,800              0
------------------------------------------------------------------------------------------------------------------------------------
PIONEER COS INC  -CL A    COMMON     723643300       6,303   210,300 SH      SOLE                            210,300              0
------------------------------------------------------------------------------------------------------------------------------------
PITNEY BOWES INC          COMMON     724479100       3,608    85,400 SH      SOLE                             85,400              0
------------------------------------------------------------------------------------------------------------------------------------
PNC FINANCIAL SVCS GROUP 
INC                       COMMON     693475105       3,456    55,900 SH      SOLE                             55,900              0
------------------------------------------------------------------------------------------------------------------------------------
PPG INDUSTRIES INC        COMMON     693506107       3,543    61,200 SH      SOLE                             61,200              0
------------------------------------------------------------------------------------------------------------------------------------
QUANEX CORP               COMMON     747620102       8,205   164,200 SH      SOLE                            164,200              0
------------------------------------------------------------------------------------------------------------------------------------
QUANTA SERVICES INC       COMMON     74762E102       5,007   380,200 SH      SOLE                            380,200              0
------------------------------------------------------------------------------------------------------------------------------------
QUIKSILVER INC            COMMON     74838C106      18,198 1,314,900 SH      SOLE                          1,314,900              0
------------------------------------------------------------------------------------------------------------------------------------
REGIONS FINL CORP         COMMON     7591EP100       3,607   105,600 SH      SOLE                            105,600              0
------------------------------------------------------------------------------------------------------------------------------------
RELIANT ENERGY INC        COMMON     75952B105      14,807 1,434,800 SH      SOLE                          1,434,800              0
------------------------------------------------------------------------------------------------------------------------------------
REYNOLDS AMERICAN INC     COMMON     761713106       3,680    38,600 SH      SOLE                             38,600              0
------------------------------------------------------------------------------------------------------------------------------------
RIVIERA HOLDINGS CORP     COMMON     769627100       3,203   195,400 SH      SOLE                            195,400              0
------------------------------------------------------------------------------------------------------------------------------------





Page 7 of 9


                                                     FORM 13F INFORMATION TABLE

                                         Name of Reporting Manager: Hennessy Advisors, Inc.

                                                                                                    Column
      Column 1:         Column 2:    Column 3:   Column 4:    Column 5:              Column 6:         7:         Column 8:
----------------------------------------------------------------------------------------------------------------------------------
                          Title                   Market                                           
                           of         CUSIP       Value       Shares or                              Other
    Name of Issuer        Class       Number    (x$1,000)  Principal Amount  Investment Discretion   Mgrs.    Voting Authority
----------------------------------------------------------------------------------------------------------------------------------
                                                                   SH/ Put/        Shared   Shared     
                                                                   PRN Call  Sole  Defined   Other         Sole    Shared  None
----------------------------------------------------------------------------------------------------------------------------------
                                                                                            
RYLAND GROUP INC          COMMON     783764103       4,523    62,700 SH      SOLE                             62,700              0
------------------------------------------------------------------------------------------------------------------------------------
SARA LEE CORP             COMMON     803111103       3,782   200,128 SH      SOLE                            198,900          1,228
------------------------------------------------------------------------------------------------------------------------------------
SEABOARD CORP             COMMON     811543107       4,231     2,800 SH      SOLE                              2,800              0
------------------------------------------------------------------------------------------------------------------------------------
SEARS HOLDING CORP        COMMON     812350106      26,422   228,700 SH      SOLE                            228,700              0
------------------------------------------------------------------------------------------------------------------------------------
SHAW GROUP INC            COMMON     820280105      12,195   419,200 SH      SOLE                            419,200              0
------------------------------------------------------------------------------------------------------------------------------------
SIERRA HEALTH SERVICES    COMMON     826322109      28,418   355,400 SH      SOLE                            355,400              0
------------------------------------------------------------------------------------------------------------------------------------
SIERRA PACIFIC RESOURCES  COMMON     826428104       4,209   322,800 SH      SOLE                            322,800              0
------------------------------------------------------------------------------------------------------------------------------------
SKYWEST INC               COMMON     830879102       4,862   181,000 SH      SOLE                            181,000              0
------------------------------------------------------------------------------------------------------------------------------------
SPARTAN STORES INC        COMMON     846822104       3,357   322,200 SH      SOLE                            322,200              0
------------------------------------------------------------------------------------------------------------------------------------
STANDARD PACIFIC CP       COMMON     85375C101       3,930   106,800 SH      SOLE                            106,800              0
------------------------------------------------------------------------------------------------------------------------------------
STOLT OFFSHORE S A         ADR       861567105       5,809   498,200 SH      SOLE                            498,200              0
------------------------------------------------------------------------------------------------------------------------------------
SYKES ENTERPRISES INC     COMMON     871237103       6,498   486,000 SH      SOLE                            486,000              0
------------------------------------------------------------------------------------------------------------------------------------
SYNAGRO TECHNOLOGIES INC  COMMON     871562203       4,004   946,600 SH      SOLE                            946,600              0
------------------------------------------------------------------------------------------------------------------------------------
TELEFONICA DE ARGENTINA 
CONT                       ADR       879991024           0    12,900 SH      SOLE                             12,900              0
------------------------------------------------------------------------------------------------------------------------------------
TELEFONICA DE ARGENTINA 
CONT                       ADR       879991016           0    12,900 SH      SOLE                             12,900              0
------------------------------------------------------------------------------------------------------------------------------------
TELEFONOS DE MEX           ADR       879403780       3,808   154,300 SH      SOLE                            154,300              0
------------------------------------------------------------------------------------------------------------------------------------
TERRA INDUSTRIES INC      COMMON     880915103      12,351 2,205,600 SH      SOLE                          2,205,600              0
------------------------------------------------------------------------------------------------------------------------------------
TESORO PETROLEUM CORP     COMMON     881609101      37,835   614,700 SH      SOLE                            614,700              0
------------------------------------------------------------------------------------------------------------------------------------
TEXAS INDUSTRIES INC      COMMON     882491103      15,650   314,000 SH      SOLE                            314,000              0
------------------------------------------------------------------------------------------------------------------------------------
THE CHARLES SCHWAB CORP   COMMON     808513105         148    10,100 SH      SOLE                                  0         10,100
------------------------------------------------------------------------------------------------------------------------------------
TOLL BROTHERS INC         COMMON     889478103      19,776   570,900 SH      SOLE                            570,900              0
------------------------------------------------------------------------------------------------------------------------------------






Page 8 of 9


                                                     FORM 13F INFORMATION TABLE

                                         Name of Reporting Manager: Hennessy Advisors, Inc.

                                                                                                    Column
      Column 1:         Column 2:    Column 3:   Column 4:    Column 5:              Column 6:         7:         Column 8:
----------------------------------------------------------------------------------------------------------------------------------
                          Title                   Market                                           
                           of         CUSIP       Value       Shares or                              Other
    Name of Issuer        Class       Number    (x$1,000)  Principal Amount  Investment Discretion   Mgrs.    Voting Authority
----------------------------------------------------------------------------------------------------------------------------------
                                                                   SH/ Put/        Shared   Shared     
                                                                   PRN Call  Sole  Defined   Other         Sole    Shared  None
----------------------------------------------------------------------------------------------------------------------------------
                                                                                            
TORO CO                   COMMON     891092108      21,075   481,500 SH      SOLE                            481,500              0
------------------------------------------------------------------------------------------------------------------------------------
TRAMMELL CROW CO          COMMON     89288R106       4,863   189,600 SH      SOLE                            189,600              0
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TRANSMONTAIGNE INC        COMMON     893934109       2,684   406,600 SH      SOLE                            406,600              0
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TRW AUTOMOTIVE HOLDINGS 
CORP                      COMMON     87264S106       4,477   169,900 SH      SOLE                            169,900              0
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U G I CORPORATION NEW     COMMON     902681105         346    16,800 SH      SOLE                                  0         16,800
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U S BANCORP               COMMON     902973304       3,544   118,575 SH      SOLE                            118,500             75
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USG CORP                  COMMON     903293405      36,465   561,000 SH      SOLE                            561,000              0
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VALERO ENERGY CORP        COMMON     91913Y100      50,269   974,200 SH      SOLE                            974,200              0
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VERIZON COMMUNICATIONS    COMMON     92343V104      10,084   334,799 SH      SOLE                            321,375         13,424
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VODAFONE GROUP PLC  -ADR   ADR       92857W100       3,486   162,365 SH      SOLE                            158,100          4,265
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WACHOVIA CORP             COMMON     929903102       3,573    67,600 SH      SOLE                             67,600              0
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WALTER INDUSTRIES INC     COMMON     93317Q105       5,086   102,300 SH      SOLE                            102,300              0
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WASHINGTON MUTUAL INC     COMMON     939322103       3,756    86,350 SH      SOLE                             85,900            450
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WELLCARE HEALTH PLANS INC COMMON     94946T106      10,029   245,500 SH      SOLE                            245,500              0
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WELLPOINT INC             COMMON     94973V107       2,808    35,195 SH      SOLE                             35,195              0
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WELLS FARGO & CO          COMMON     949746101       4,536    72,190 SH      SOLE                             57,000         15,190
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WESCO INTL INC            COMMON     95082P105      28,236   660,800 SH      SOLE                            660,800              0
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WESTAMERICA BANCORP       COMMON     957090103         500     9,415 SH      SOLE                                  0          9,415
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WESTERN DIGITAL CORP      COMMON     958102105       6,424   345,200 SH      SOLE                            345,200              0
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WESTERN GAS RESOURCES INC COMMON     958259103       4,403    93,500 SH      SOLE                             93,500              0
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WEYERHAEUSER CO           COMMON     962166104       3,569    53,800 SH      SOLE                             53,800              0
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Page 9 of 9


                                                     FORM 13F INFORMATION TABLE

                                         Name of Reporting Manager: Hennessy Advisors, Inc.

                                                                                                    Column
      Column 1:         Column 2:    Column 3:   Column 4:    Column 5:              Column 6:         7:         Column 8:
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                          Title                   Market                                           
                           of         CUSIP       Value       Shares or                              Other
    Name of Issuer        Class       Number    (x$1,000)  Principal Amount  Investment Discretion   Mgrs.    Voting Authority
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                                                                   SH/ Put/        Shared   Shared     
                                                                   PRN Call  Sole  Defined   Other         Sole    Shared  None
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WILLIAM LYON HOMES        COMMON     552074106       3,289    32,600 SH      SOLE                             32,600              0
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WORLD AIR HOLDINGS INC    COMMON     98142V104       3,617   376,000 SH      SOLE                            376,000              0
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XL CAPITAL LTD             ADR       G98255105       3,612    53,600 SH      SOLE                             53,600              0
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YELLOW ROADWAY CORP       COMMON     985577105      15,685   351,600 SH      SOLE                            351,600              0
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              TOTAL                              1,792,142
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