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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:  September 30, 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                October 18, 2005
--------------------------------------------------------------------------------
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:                       178
                                                 ----------------------

Form 13F Information Table Value Total:                $1,782,289
                                                 ----------------------
                                                       (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
----------------------------------------------------------------------------------------------------------------------------------
                                                                                               
----------------------------------------------------------------------------------------------------------------------------------
ADOBE SYSTEMS INC         COMMON     00724F101       119      4,000  SH      SOLE                                0           4,000
----------------------------------------------------------------------------------------------------------------------------------
ADVANCE AUTO PARTS INC    COMMON     00751Y106     4,531    117,150  SH      SOLE                          117,150               0
----------------------------------------------------------------------------------------------------------------------------------
AEGON NV ORD REG AMER       ADR      007924103        93      6,221  SH      SOLE                                0           6,221
----------------------------------------------------------------------------------------------------------------------------------
AETNA INC                 COMMON     00817Y108    31,321    363,600  SH      SOLE                          363,600               0
----------------------------------------------------------------------------------------------------------------------------------
AK STEEL HOLDING CORP     COMMON     001547108    11,187  1,305,400  SH      SOLE                        1,305,400               0
----------------------------------------------------------------------------------------------------------------------------------
ALBERTSONS INC            COMMON     013104104     4,058    158,200  SH      SOLE                          158,200               0
----------------------------------------------------------------------------------------------------------------------------------
ALLEGHENY TECHNOLOGIES 
INC                       COMMON     01741R102     4,099    132,300  SH      SOLE                          132,300               0
----------------------------------------------------------------------------------------------------------------------------------
ALLIANCE IMAGING INC      COMMON     018606202    14,356  1,679,100  SH      SOLE                        1,679,100               0
----------------------------------------------------------------------------------------------------------------------------------
ALLTEL CORP               COMMON     020039103     4,156     63,830  SH      SOLE                           63,000             830
----------------------------------------------------------------------------------------------------------------------------------
ALTRIA GROUP INC.         COMMON     02209S103    13,814    187,414  SH      SOLE                          186,975             439
----------------------------------------------------------------------------------------------------------------------------------
AMERCO                    COMMON     023586100     5,476     94,100  SH      SOLE                           94,100               0
----------------------------------------------------------------------------------------------------------------------------------
AMERIGROUP CORP           COMMON     03073T102     9,547    499,300  SH      SOLE                          499,300               0
----------------------------------------------------------------------------------------------------------------------------------
ANDERSONS INC             COMMON     034164103     4,322    147,600  SH      SOLE                          147,600               0
----------------------------------------------------------------------------------------------------------------------------------
AON CORP                  COMMON     037389103     5,213    162,500  SH      SOLE                          162,500               0
----------------------------------------------------------------------------------------------------------------------------------
AT&T CORP                 COMMON     001957505     6,450    325,739  SH      SOLE                          324,600           1,139
----------------------------------------------------------------------------------------------------------------------------------
BADGER METER INC          COMMON     056525108     4,862    123,600  SH      SOLE                          123,600               0
----------------------------------------------------------------------------------------------------------------------------------
BANK of AMERICA CORP      COMMON     060505104     4,002     95,051  SH      SOLE                           81,600          13,451
----------------------------------------------------------------------------------------------------------------------------------
BB&T CORP                 COMMON     054937107     3,421     87,600  SH      SOLE                           87,600               0
----------------------------------------------------------------------------------------------------------------------------------
BELLSOUTH CORP            COMMON     079860102     3,517    133,738  SH      SOLE                          130,000           3,738
----------------------------------------------------------------------------------------------------------------------------------
BLACK & DECKER CORP       COMMON     091797100    17,559    213,900  SH      SOLE                          213,900               0
----------------------------------------------------------------------------------------------------------------------------------
BLOUNT INTL INC           COMMON     095180105    19,127  1,084,300  SH      SOLE                        1,084,300               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
----------------------------------------------------------------------------------------------------------------------------------
                                                                                               
----------------------------------------------------------------------------------------------------------------------------------
BLUEGREEN CORP            COMMON     096231105    16,813    952,600  SH      SOLE                          952,600               0
----------------------------------------------------------------------------------------------------------------------------------
BP PLC  -ADS                ADR      055622104     4,944     69,788  SH      SOLE                           63,300           6,488
----------------------------------------------------------------------------------------------------------------------------------
BRINKS CO                 COMMON     109696104    19,627    478,000  SH      SOLE                          478,000               0
----------------------------------------------------------------------------------------------------------------------------------
BRISTOL MYERS SQUIBB      COMMON     110122108     3,717    154,500  SH      SOLE                          153,700             800
----------------------------------------------------------------------------------------------------------------------------------
BUILDING MATERIALS HLDG 
CP                        COMMON     120113105    50,071    536,900  SH      SOLE                          536,900               0
----------------------------------------------------------------------------------------------------------------------------------
BUNGE LTD                 COMMON     G16962105    17,433    331,300  SH      SOLE                          331,300               0
----------------------------------------------------------------------------------------------------------------------------------
BURLINGTON COAT FACTORY   COMMON     121579106     4,454    117,100  SH      SOLE                          117,100               0
----------------------------------------------------------------------------------------------------------------------------------
CARPENTER TECHNOLOGY CORP COMMON     144285103    18,937    323,100  SH      SOLE                          323,100               0
----------------------------------------------------------------------------------------------------------------------------------
CB RICHARD ELLIS GROUP 
INC                       COMMON     12497T101    10,475    212,900  SH      SOLE                          202,900          10,000
----------------------------------------------------------------------------------------------------------------------------------
CEMEX S A                   ADR      151290889     5,758    110,100  SH      SOLE                          110,100               0
----------------------------------------------------------------------------------------------------------------------------------
CENTENE CORP              COMMON     15135B101    16,677    666,300  SH      SOLE                          666,300               0
----------------------------------------------------------------------------------------------------------------------------------
CHAMPION ENTERPRISES INC  COMMON     158496109    23,620  1,598,100  SH      SOLE                        1,598,100               0
----------------------------------------------------------------------------------------------------------------------------------
CHAPARRAL STEEL CO        COMMON     159423102     7,637    302,800  SH      SOLE                          302,800               0
----------------------------------------------------------------------------------------------------------------------------------
CHARLES SCHWAB CORP       COMMON     808513105       146     10,100  SH      SOLE                                0          10,100
----------------------------------------------------------------------------------------------------------------------------------
CHEMED CORP               COMMON     16359R103     5,222    120,500  SH      SOLE                          120,500               0
----------------------------------------------------------------------------------------------------------------------------------
CHEVRONTEXACO CORP        COMMON     166764100     5,592     86,397  SH      SOLE                           70,400          15,997
----------------------------------------------------------------------------------------------------------------------------------
CHILDRENS PLACE RETAIL 
STRS                      COMMON     168905107     4,346    122,100  SH      SOLE                          122,100               0
----------------------------------------------------------------------------------------------------------------------------------
CIGNA CORP                COMMON     125509109       106        900  SH      SOLE                                0             900
----------------------------------------------------------------------------------------------------------------------------------
CITIGROUP INC             COMMON     172967101    11,216    246,400  SH      SOLE                          246,400               0
----------------------------------------------------------------------------------------------------------------------------------
CLEAN HARBORS INC         COMMON     184496107     4,234    124,700  SH      SOLE                          124,700               0
----------------------------------------------------------------------------------------------------------------------------------
CLEVELAND-CLIFFS INC      COMMON     185896107    35,741    410,300  SH      SOLE                          410,300               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
----------------------------------------------------------------------------------------------------------------------------------
                                                                                               
----------------------------------------------------------------------------------------------------------------------------------
CMS ENERGY CORP           COMMON     125896100     4,101    249,300  SH      SOLE                          249,300               0
----------------------------------------------------------------------------------------------------------------------------------
COCA-COLA COMPANY         COMMON     191216100     4,584    106,125  SH      SOLE                          106,125               0
----------------------------------------------------------------------------------------------------------------------------------
COMMERCIAL METALS         COMMON     201723103    29,398    871,300  SH      SOLE                          871,300               0
----------------------------------------------------------------------------------------------------------------------------------
CONAGRA FOODS INC         COMMON     205887102     3,331    134,600  SH      SOLE                          134,600               0
----------------------------------------------------------------------------------------------------------------------------------
CONSOL ENERGY INC         COMMON     20854P109    35,099    460,200  SH      SOLE                          460,200               0
----------------------------------------------------------------------------------------------------------------------------------
DENNYS CORP               COMMON     24869P104     3,865    931,400  SH      SOLE                          931,400               0
----------------------------------------------------------------------------------------------------------------------------------
DONNELLEY (R R) & SONS CO COMMON     257867101     4,033    108,800  SH      SOLE                          108,800               0
----------------------------------------------------------------------------------------------------------------------------------
DOW CHEMICAL              COMMON     260543103     3,179     76,300  SH      SOLE                           76,300               0
----------------------------------------------------------------------------------------------------------------------------------
DU PONT (E I) DE NEMOURS  COMMON     263534109     9,890    252,500  SH      SOLE                          251,950             550
----------------------------------------------------------------------------------------------------------------------------------
ELECTRONICS BOUTIQUE HLDG 
CP                        COMMON     286045109    27,643    439,900  SH      SOLE                          439,900               0
----------------------------------------------------------------------------------------------------------------------------------
EMERSON ELECTRIC          COMMON     291011104     1,475     20,550  SH      SOLE                                0          20,550
----------------------------------------------------------------------------------------------------------------------------------
EXPRESS SCRIPTS INC       COMMON     302182100     4,105     66,000  SH      SOLE                           66,000               0
----------------------------------------------------------------------------------------------------------------------------------
EXXON MOBIL CORPORATION   COMMON     30231G102     4,034     63,485  SH      SOLE                           56,300           7,185
----------------------------------------------------------------------------------------------------------------------------------
FANNIE MAE                COMMON     313586109     2,380     53,100  SH      SOLE                           53,100               0
----------------------------------------------------------------------------------------------------------------------------------
FLOWSERVE CORP            COMMON     34354P105     4,195    115,400  SH      SOLE                          115,400               0
----------------------------------------------------------------------------------------------------------------------------------
FORD MOTOR CO             COMMON     345370860     2,576    261,246  SH      SOLE                          261,000             246
----------------------------------------------------------------------------------------------------------------------------------
FRONTIER OIL CORP         COMMON     35914P105    11,092    250,100  SH      SOLE                          250,100               0
----------------------------------------------------------------------------------------------------------------------------------
GEHL CO                   COMMON     368483103     5,410    194,100  SH      SOLE                          194,100               0
----------------------------------------------------------------------------------------------------------------------------------
GENERAL ELECTRIC CO.      COMMON     369604103     3,487    103,559  SH      SOLE                          103,025             534
----------------------------------------------------------------------------------------------------------------------------------
GENERAL MILLS INC         COMMON     370334104     3,711     77,000  SH      SOLE                           77,000               0
----------------------------------------------------------------------------------------------------------------------------------
GENERAL MOTORS CORP       COMMON     370442105     9,550    311,989  SH      SOLE                          311,475             514
----------------------------------------------------------------------------------------------------------------------------------




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
----------------------------------------------------------------------------------------------------------------------------------
                                                                                               
----------------------------------------------------------------------------------------------------------------------------------
GENESCO INC               COMMON     371532102    27,505    738,600  SH      SOLE                          738,600               0
----------------------------------------------------------------------------------------------------------------------------------
GEORGIA GULF CORP         COMMON     373200203     9,134    379,300  SH      SOLE                          379,300               0
----------------------------------------------------------------------------------------------------------------------------------
GOODYEAR TIRE & RUBBER CO COMMON     382550101     4,064    260,700  SH      SOLE                          260,700               0
----------------------------------------------------------------------------------------------------------------------------------
GRACE (W R) & CO          COMMON     38388F108    12,422  1,387,900  SH      SOLE                        1,387,900               0
----------------------------------------------------------------------------------------------------------------------------------
GREAT ATLANTIC & PAC TEA 
CO                        COMMON     390064103     5,042    177,800  SH      SOLE                          177,800               0
----------------------------------------------------------------------------------------------------------------------------------
GREENBRIER COMPANIES INC  COMMON     393657101    18,548    558,000  SH      SOLE                          558,000               0
----------------------------------------------------------------------------------------------------------------------------------
HEALTHCARE SERVICES GROUP COMMON     421906108     4,813    250,000  SH      SOLE                          250,000               0
----------------------------------------------------------------------------------------------------------------------------------
HEINZ (H J) CO            COMMON     423074103     3,574     97,800  SH      SOLE                           97,800               0
----------------------------------------------------------------------------------------------------------------------------------
HENNESSY ADVISORS INC     COMMON     425885100    38,119  1,466,120  SH      SOLE                                0       1,466,120
----------------------------------------------------------------------------------------------------------------------------------
HEXCEL CORP               COMMON     428291108    23,826  1,302,700  SH      SOLE                        1,302,700               0
----------------------------------------------------------------------------------------------------------------------------------
HOLLY CORP                COMMON     435758305    11,024    172,300  SH      SOLE                          172,300               0
----------------------------------------------------------------------------------------------------------------------------------
HOVNANIAN ENTRPRS INC     CLASS A    442487203     3,983     77,800  SH      SOLE                           77,800               0
----------------------------------------------------------------------------------------------------------------------------------
HSBC HOLDINGS PLC           ADR      404280406     3,590     44,200  SH      SOLE                           44,200               0
----------------------------------------------------------------------------------------------------------------------------------
HUMANA INC                COMMON     444859102    10,093    210,800  SH      SOLE                          210,800               0
----------------------------------------------------------------------------------------------------------------------------------
HUNT (JB) TRANSPRT SVCS 
INC                       COMMON     445658107    16,012    842,300  SH      SOLE                          842,300               0
----------------------------------------------------------------------------------------------------------------------------------
INTL PAPER CO             COMMON     460146103     2,879     96,625  SH      SOLE                           95,750             875
----------------------------------------------------------------------------------------------------------------------------------
IPSCO INC                   ADR      462622101    28,253    395,200  SH      SOLE                          395,200               0
----------------------------------------------------------------------------------------------------------------------------------
J P MORGAN CHASE & CO     COMMON     46625H100    10,465    308,420  SH      SOLE                          307,725             695
----------------------------------------------------------------------------------------------------------------------------------
JACOBS ENGINEERING GROUP 
INC                       COMMON     469814107     4,078     60,500  SH      SOLE                           60,500               0
----------------------------------------------------------------------------------------------------------------------------------
JLG INDUSTRIES INC        COMMON     466210101    11,101    303,400  SH      SOLE                          303,400               0
----------------------------------------------------------------------------------------------------------------------------------
JONES LANG LASALLE INC    COMMON     48020Q107    23,256    504,900  SH      SOLE                          504,900               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
----------------------------------------------------------------------------------------------------------------------------------
                                                                                               
----------------------------------------------------------------------------------------------------------------------------------
KB HOME                   COMMON     48666K109     5,000     68,300  SH      SOLE                           68,300               0
----------------------------------------------------------------------------------------------------------------------------------
KERR-MCGEE CORP           COMMON     492386107     6,166     63,500  SH      SOLE                           63,500               0
----------------------------------------------------------------------------------------------------------------------------------
KIMBERLY-CLARK CORP       COMMON     494368103     3,496     58,726  SH      SOLE                           57,600           1,126
----------------------------------------------------------------------------------------------------------------------------------
LABOR READY INC           COMMON     505401208     4,022    156,800  SH      SOLE                          156,800               0
----------------------------------------------------------------------------------------------------------------------------------
LANDSTAR SYSTEM INC       COMMON     515098101    20,535    513,000  SH      SOLE                          513,000               0
----------------------------------------------------------------------------------------------------------------------------------
LENNOX INTERNATIONAL INC  COMMON     526107107     4,196    153,100  SH      SOLE                          153,100               0
----------------------------------------------------------------------------------------------------------------------------------
LILLY (ELI) & CO          COMMON     532457108     3,511     65,600  SH      SOLE                           65,600               0
----------------------------------------------------------------------------------------------------------------------------------
LINCOLN NATIONAL CORP     COMMON     534187109     4,078     78,400  SH      SOLE                           78,400               0
----------------------------------------------------------------------------------------------------------------------------------
LONGS DRUG STORES CORP    COMMON     543162101     4,992    116,400  SH      SOLE                          116,400               0
----------------------------------------------------------------------------------------------------------------------------------
LUBYS INC                 COMMON     549282101     5,466    418,500  SH      SOLE                          418,500               0
----------------------------------------------------------------------------------------------------------------------------------
LUFKIN INDUSTRIES INC     COMMON     549764108     6,023    138,300  SH      SOLE                          138,300               0
----------------------------------------------------------------------------------------------------------------------------------
LYONDELL CHEMICAL CO      COMMON     552078107    18,695    653,200  SH      SOLE                          653,200               0
----------------------------------------------------------------------------------------------------------------------------------
MARATHON OIL CORP         COMMON     565849106     6,962    101,000  SH      SOLE                          101,000               0
----------------------------------------------------------------------------------------------------------------------------------
MARSH & MCLENNAN COS      COMMON     571748102     3,604    118,600  SH      SOLE                          118,600               0
----------------------------------------------------------------------------------------------------------------------------------
MCDERMOTT INTL INC        COMMON     580037109    41,706  1,139,200  SH      SOLE                        1,139,200               0
----------------------------------------------------------------------------------------------------------------------------------
MEADWESTVACO CORP         COMMON     583334107     3,146    113,900  SH      SOLE                          113,900               0
----------------------------------------------------------------------------------------------------------------------------------
MENS WEARHOUSE INC        COMMON     587118100     3,874    145,100  SH      SOLE                          145,100               0
----------------------------------------------------------------------------------------------------------------------------------
MERCK & CO                COMMON     589331107     9,529    350,186  SH      SOLE                          349,600             586
----------------------------------------------------------------------------------------------------------------------------------
MERITAGE HOMES CORP       COMMON     59001A102    30,549    398,500  SH      SOLE                          398,500               0
----------------------------------------------------------------------------------------------------------------------------------
MOLINA HEALTHCARE INC     COMMON     60855R100    10,178    407,300  SH      SOLE                          407,300               0
----------------------------------------------------------------------------------------------------------------------------------
MULTI-FINELINE ELECTRON 
INC                       COMMON     62541B101     8,002    273,400  SH      SOLE                          273,400               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
----------------------------------------------------------------------------------------------------------------------------------
                                                                                               
----------------------------------------------------------------------------------------------------------------------------------
NATIONAL CITY CORP        COMMON     635405103     3,374    100,900  SH      SOLE                          100,900               0
----------------------------------------------------------------------------------------------------------------------------------
NCR CORP                  COMMON     62886E108    17,414    545,732  SH      SOLE                          545,700              32
----------------------------------------------------------------------------------------------------------------------------------
NOVA CHEMICALS CORP         ADR      66977W109    14,698    399,400  SH      SOLE                          399,400               0
----------------------------------------------------------------------------------------------------------------------------------
NOVAMERICAN STEEL INC       ADR      669959108    12,565    336,400  SH      SOLE                          336,400               0
----------------------------------------------------------------------------------------------------------------------------------
NS GROUP, INC.            COMMON     628916108     5,935    151,200  SH      SOLE                          151,200               0
----------------------------------------------------------------------------------------------------------------------------------
NUCOR CORP                COMMON     670346105    21,289    360,900  SH      SOLE                          360,900               0
----------------------------------------------------------------------------------------------------------------------------------
NVR INC                   COMMON     62944T105    21,770     24,600  SH      SOLE                           24,600               0
----------------------------------------------------------------------------------------------------------------------------------
OFFICE DEPOT INC          COMMON     676220106     4,057    136,600  SH      SOLE                          136,600               0
----------------------------------------------------------------------------------------------------------------------------------
OIL STATES INTL INC       COMMON     678026105     4,259    117,300  SH      SOLE                          117,300               0
----------------------------------------------------------------------------------------------------------------------------------
OLD DOMINION FREIGHT      COMMON     679580100    18,178    542,800  SH      SOLE                          542,800               0
----------------------------------------------------------------------------------------------------------------------------------
OREGON STEEL MILLS INC    COMMON     686079104    25,975    931,000  SH      SOLE                          931,000               0
----------------------------------------------------------------------------------------------------------------------------------
P G & E CORP              COMMON     69331C108       236      6,005  SH      SOLE                                0           6,005
----------------------------------------------------------------------------------------------------------------------------------
PANTRY INC                COMMON     698657103     4,712    126,100  SH      SOLE                          126,100               0
----------------------------------------------------------------------------------------------------------------------------------
PAR TECHNOLOGY CORP       COMMON     698884103     3,910    170,000  SH      SOLE                          170,000               0
----------------------------------------------------------------------------------------------------------------------------------
PFIZER INC                COMMON     717081103     8,312    332,875  SH      SOLE                          330,775           2,100
----------------------------------------------------------------------------------------------------------------------------------
PHILLIPS-VAN HEUSEN CORP  COMMON     718592108     4,693    151,300  SH      SOLE                          151,300               0
----------------------------------------------------------------------------------------------------------------------------------
PIONEER COS INC           CLASS A    723643300     5,476    227,600  SH      SOLE                          227,600               0
----------------------------------------------------------------------------------------------------------------------------------
PITNEY BOWES INC          COMMON     724479100     3,452     82,700  SH      SOLE                           82,700               0
----------------------------------------------------------------------------------------------------------------------------------
PNC FINANCIAL SVCS GROUP 
INC                       COMMON     693475105     3,916     67,500  SH      SOLE                           67,500               0
----------------------------------------------------------------------------------------------------------------------------------
PPG INDUSTRIES INC        COMMON     693506107     3,297     55,700  SH      SOLE                           55,700               0
----------------------------------------------------------------------------------------------------------------------------------
QUANEX CORP               COMMON     747620102    10,516    158,800  SH      SOLE                          158,800               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
----------------------------------------------------------------------------------------------------------------------------------
                                                                                               
----------------------------------------------------------------------------------------------------------------------------------
QUANTA SERVICES INC       COMMON     74762E102     4,062    318,300  SH      SOLE                          318,300               0
----------------------------------------------------------------------------------------------------------------------------------
QUIKSILVER INC            COMMON     74838C106    18,325  1,268,200  SH      SOLE                        1,268,200               0
----------------------------------------------------------------------------------------------------------------------------------
REGIONS FINL CORP         COMMON     7591EP100     3,308    106,300  SH      SOLE                          106,300               0
----------------------------------------------------------------------------------------------------------------------------------
RELIANT ENERGY INC        COMMON     75952B105    21,366  1,383,800  SH      SOLE                        1,383,800               0
----------------------------------------------------------------------------------------------------------------------------------
RIVIERA HOLDINGS CORP     COMMON     769627100     4,691    211,500  SH      SOLE                          211,500               0
----------------------------------------------------------------------------------------------------------------------------------
RYLAND GROUP INC          COMMON     783764103     4,646     67,900  SH      SOLE                           67,900               0
----------------------------------------------------------------------------------------------------------------------------------
SARA LEE CORP             COMMON     803111103     2,925    154,328  SH      SOLE                          153,100           1,228
----------------------------------------------------------------------------------------------------------------------------------
SBC COMMUNICATIONS INC    COMMON     78387G103    11,458    478,019  SH      SOLE                          470,100           7,919
----------------------------------------------------------------------------------------------------------------------------------
SEABOARD CORP             COMMON     811543107     4,119      3,000  SH      SOLE                            3,000               0
----------------------------------------------------------------------------------------------------------------------------------
SEARS HOLDING CORP        COMMON     812350106    27,897    224,200  SH      SOLE                          224,200               0
----------------------------------------------------------------------------------------------------------------------------------
SHAW GROUP INC            COMMON     820280105     9,963    404,000  SH      SOLE                          404,000               0
----------------------------------------------------------------------------------------------------------------------------------
SIERRA HEALTH SERVICES    COMMON     826322109    23,609    342,800  SH      SOLE                          342,800               0
----------------------------------------------------------------------------------------------------------------------------------
SIERRA PACIFIC RESOURCES  COMMON     826428104     4,036    271,800  SH      SOLE                          271,800               0
----------------------------------------------------------------------------------------------------------------------------------
SKYWEST INC               COMMON     830879102     4,063    151,500  SH      SOLE                          151,500               0
----------------------------------------------------------------------------------------------------------------------------------
SPARTAN STORES INC        COMMON     846822104     3,592    348,700  SH      SOLE                          348,700               0
----------------------------------------------------------------------------------------------------------------------------------
SPRINT NEXTEL CORP        COMMON     852061100       149      6,257  SH      SOLE                                0           6,257
----------------------------------------------------------------------------------------------------------------------------------
STANDARD PACIFIC CP       COMMON     85375C101     4,799    115,600  SH      SOLE                          115,600               0
----------------------------------------------------------------------------------------------------------------------------------
STOLT OFFSHORE S A          ADR      861567105     6,245    539,300  SH      SOLE                          539,300               0
----------------------------------------------------------------------------------------------------------------------------------
SYKES ENTERPRISES INC     COMMON     871237103     6,259    526,000  SH      SOLE                          526,000               0
----------------------------------------------------------------------------------------------------------------------------------
SYNAGRO TECHNOLOGIES INC  COMMON     871562203     4,816  1,024,600  SH      SOLE                        1,024,600               0
----------------------------------------------------------------------------------------------------------------------------------
TELEFONICA DE ARGENTINA     ADR      879991016         0     12,900  SH      SOLE                                0          12,900
----------------------------------------------------------------------------------------------------------------------------------




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
----------------------------------------------------------------------------------------------------------------------------------
                                                                                               
----------------------------------------------------------------------------------------------------------------------------------
TELEFONICA DE ARGENTINA     ADR      879991024         0     12,900  SH      SOLE                                0          12,900
----------------------------------------------------------------------------------------------------------------------------------
TELEFONOS DE MEX            ADR      879403780     4,588    215,700  SH      SOLE                          215,700               0
----------------------------------------------------------------------------------------------------------------------------------
TERRA INDUSTRIES INC      COMMON     880915103    14,146  2,127,200  SH      SOLE                        2,127,200               0
----------------------------------------------------------------------------------------------------------------------------------
TESORO PETROLEUM CORP     COMMON     881609101    39,867    592,900  SH      SOLE                          592,900               0
----------------------------------------------------------------------------------------------------------------------------------
TEXAS INDUSTRIES INC      COMMON     882491103    16,472    302,800  SH      SOLE                          302,800               0
----------------------------------------------------------------------------------------------------------------------------------
TOLL BROTHERS INC         COMMON     889478103    24,595    550,600  SH      SOLE                          550,600               0
----------------------------------------------------------------------------------------------------------------------------------
TORO CO                   COMMON     891092108    17,071    464,400  SH      SOLE                          464,400               0
----------------------------------------------------------------------------------------------------------------------------------
TOTAL SA                    ADR      89151E109     4,713     34,700  SH      SOLE                           34,700               0
----------------------------------------------------------------------------------------------------------------------------------
TRAMMELL CROW CO          COMMON     89288R106     5,064    205,200  SH      SOLE                          205,200               0
----------------------------------------------------------------------------------------------------------------------------------
TRANSMONTAIGNE INC        COMMON     893934109     3,516    440,100  SH      SOLE                          440,100               0
----------------------------------------------------------------------------------------------------------------------------------
TRW AUTOMOTIVE HOLDINGS   COMMON     87264S106     4,172    142,200  SH      SOLE                          142,200               0
----------------------------------------------------------------------------------------------------------------------------------
U G I CORPORATION NEW     COMMON     902681105       473     16,800  SH      SOLE                                0          16,800
----------------------------------------------------------------------------------------------------------------------------------
U S BANCORP               COMMON     902973304     3,535    125,875  SH      SOLE                          125,800              75
----------------------------------------------------------------------------------------------------------------------------------
USG CORP                  COMMON     903293405    36,532    531,600  SH      SOLE                          531,600               0
----------------------------------------------------------------------------------------------------------------------------------
VALERO ENERGY CORP        COMMON     91913Y100    53,862    476,400  SH      SOLE                          476,400               0
----------------------------------------------------------------------------------------------------------------------------------
VERIZON COMMUNICATIONS    COMMON     92343V104     8,403    257,047  SH      SOLE                          243,625          13,422
----------------------------------------------------------------------------------------------------------------------------------
VODAFONE GROUP PLC          ADR      92857W100       111      4,265  SH      SOLE                                0           4,265
----------------------------------------------------------------------------------------------------------------------------------
WACHOVIA CORP             COMMON     929903102     3,265     68,600  SH      SOLE                           68,600               0
----------------------------------------------------------------------------------------------------------------------------------
WALTER INDUSTRIES INC     COMMON     93317Q105     4,188     85,600  SH      SOLE                           85,600               0
----------------------------------------------------------------------------------------------------------------------------------
WASHINGTON MUTUAL INC     COMMON     939322103     3,563     90,850  SH      SOLE                           90,400             450
----------------------------------------------------------------------------------------------------------------------------------
WELLCARE HEALTH PLANS INC COMMON     94946T106     8,796    237,400  SH      SOLE                          237,400               0
----------------------------------------------------------------------------------------------------------------------------------





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:
----------------------------------------------------------------------------------------------------------------------------------
                          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
----------------------------------------------------------------------------------------------------------------------------------
                                                                                               
----------------------------------------------------------------------------------------------------------------------------------
WELLCHOICE INC            COMMON     949475107     5,563     73,300  SH      SOLE                           73,300               0
----------------------------------------------------------------------------------------------------------------------------------
WELLS FARGO & CO          COMMON     949746101     4,374     74,675  SH      SOLE                           59,400          15,275
----------------------------------------------------------------------------------------------------------------------------------
WESCO INTL INC            COMMON     95082P105    21,585    637,300  SH      SOLE                          637,300               0
----------------------------------------------------------------------------------------------------------------------------------
WESTAMERICA BANCORP       COMMON     957090103       486      9,411  SH      SOLE                                0           9,411
----------------------------------------------------------------------------------------------------------------------------------
WESTERN DIGITAL CORP      COMMON     958102105     4,832    373,700  SH      SOLE                          373,700               0
----------------------------------------------------------------------------------------------------------------------------------
WESTERN GAS RESOURCES INC COMMON     958259103     4,011     78,300  SH      SOLE                           78,300               0
----------------------------------------------------------------------------------------------------------------------------------
WILLIAM LYON HOMES        COMMON     552074106     4,237     27,300  SH      SOLE                           27,300               0
----------------------------------------------------------------------------------------------------------------------------------
WORLD AIR HOLDINGS INC    COMMON     98142V104     4,012    406,900  SH      SOLE                          406,900               0
----------------------------------------------------------------------------------------------------------------------------------
XL CAPITAL LTD              ADR      G98255105     3,204     47,100  SH      SOLE                           47,100               0
----------------------------------------------------------------------------------------------------------------------------------
YELLOW ROADWAY CORP       COMMON     985577105    14,046    339,100  SH      SOLE                          339,100               0
----------------------------------------------------------------------------------------------------------------------------------
                     TOTAL                     1,782,289
----------------------------------------------------------------------------------------------------------------------------------