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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, 2004 

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 21, 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:                      140               
                                                     -----------

Form 13F Information Table Value Total:              $ 1,358,256         
                                                     -----------
                                                     (thousands)


List of Other Included Managers:    NONE


























Page 1 of 7


                                                     FORM 13F INFORMATION TABLE
                                              Name of Reporting Manager:   Hennessy Advisors, Inc.

      Column 1:         Column 2:  Column 3:   Column 4:     Column 5:              Column 6:        Column 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 
----------------------------------------------------------------------------------------------------------------------------------
                                                                                             

----------------------------------------------------------------------------------------------------------------------------------
ACTUANT CORP             CLASS A   00508X203    23,076     442,500  SH       SOLE                              442,500
----------------------------------------------------------------------------------------------------------------------------------
AEGON NV ORD REG AMER      ADR     007924103       139      10,147  SH       SOLE                                          10,147
----------------------------------------------------------------------------------------------------------------------------------
ALAMOSA HOLDINGS INC     COMMON    011589108    37,341   2,994,500  SH       SOLE                            2,994,500
----------------------------------------------------------------------------------------------------------------------------------
ALBERTSONS INC           COMMON    013104104     4,019     168,300  SH       SOLE                              168,300
----------------------------------------------------------------------------------------------------------------------------------
ALCATEL  -ADS              ADR     013904305    14,980     958,400  SH       SOLE                              958,400
----------------------------------------------------------------------------------------------------------------------------------
ALLEGHENY ENERGY INC     COMMON    017361106     2,151     109,146  SH       SOLE                              108,800        346
----------------------------------------------------------------------------------------------------------------------------------
ALLMERICA FINANCIAL CORP COMMON    019754100    15,673     477,400  SH       SOLE                              477,400
----------------------------------------------------------------------------------------------------------------------------------
ALLTEL CORP              COMMON    020039103     3,992      67,930  SH       SOLE                               67,100        830
----------------------------------------------------------------------------------------------------------------------------------
ALTRIA GROUP INC         COMMON    02209S103     9,729     242,510  SH       SOLE                              241,100      1,410
----------------------------------------------------------------------------------------------------------------------------------
AMERADA HESS CORP        COMMON    023551104     1,623      19,700  SH       SOLE                               19,700
----------------------------------------------------------------------------------------------------------------------------------
AMR CORP/DE              COMMON    001765106    12,957   1,183,300  SH       SOLE                            1,183,300
----------------------------------------------------------------------------------------------------------------------------------
AON CORP                 COMMON    037389103     4,125     172,900  SH       SOLE                              172,900
----------------------------------------------------------------------------------------------------------------------------------
ARROW ELECTRONICS INC    COMMON    042735100    14,553     598,900  SH       SOLE                              598,900
----------------------------------------------------------------------------------------------------------------------------------
ASHLAND INC              COMMON    044204105     1,810      31,000  SH       SOLE                               31,000
----------------------------------------------------------------------------------------------------------------------------------
AT&T CORP                COMMON    001957505    10,749     563,964  SH       SOLE                              559,975      3,989
----------------------------------------------------------------------------------------------------------------------------------
AVNET INC                COMMON    053807103    11,719     642,500  SH       SOLE                              642,500
----------------------------------------------------------------------------------------------------------------------------------
BANK of AMERICA CORP     COMMON    060505104     4,824     102,665  SH       SOLE                               86,800     15,865
----------------------------------------------------------------------------------------------------------------------------------
BB&T CORP                COMMON    054937107     3,919      93,200  SH       SOLE                               93,200
----------------------------------------------------------------------------------------------------------------------------------
BELLSOUTH CORP           COMMON    079860102     3,953     142,240  SH       SOLE                              138,300      3,940
----------------------------------------------------------------------------------------------------------------------------------
BEVERLY ENTERPRISES      COMMON    087851309    18,135   1,982,000  SH       SOLE                            1,982,000
----------------------------------------------------------------------------------------------------------------------------------
BLACK & DECKER CORP      COMMON    091797100     2,014      22,800  SH       SOLE                               22,800
----------------------------------------------------------------------------------------------------------------------------------
BP PLC  -ADS               ADR     055622104     4,414      75,588  SH       SOLE                               67,300      8,288
----------------------------------------------------------------------------------------------------------------------------------
BRISTOL MYERS SQUIBB     COMMON    110122108     4,209     164,300  SH       SOLE                              163,500        800
----------------------------------------------------------------------------------------------------------------------------------





Page 2 of 7


                                                     FORM 13F INFORMATION TABLE
                                              Name of Reporting Manager:   Hennessy Advisors, Inc.

      Column 1:         Column 2:  Column 3:   Column 4:     Column 5:              Column 6:        Column 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 
----------------------------------------------------------------------------------------------------------------------------------
                                                                                             

----------------------------------------------------------------------------------------------------------------------------------
BRUNSWICK CORP           COMMON    117043109     1,955      39,500  SH       SOLE                               39,500
----------------------------------------------------------------------------------------------------------------------------------
C B RICHARD ELLIS SVCS   COMMON    12489L108       336      10,000  SH       SOLE                                          10,000
----------------------------------------------------------------------------------------------------------------------------------
CARPENTER TECHNOLOGY 
CORP                     COMMON    144285103    33,883     579,600  SH       SOLE                              579,600
----------------------------------------------------------------------------------------------------------------------------------
CASH AMERICA INTL INC    COMMON    14754D100    22,782     766,300  SH       SOLE                              766,300
----------------------------------------------------------------------------------------------------------------------------------
CEMEX S A                  ADR     151290889     4,265     117,100  SH       SOLE                              117,100
----------------------------------------------------------------------------------------------------------------------------------
CENTURY ALUMINUM CO      COMMON    156431108    17,744     675,700  SH       SOLE                              675,700
----------------------------------------------------------------------------------------------------------------------------------
CHARLES SCHWAB CORP      COMMON    808513105       121      10,100  SH       SOLE                                          10,100
----------------------------------------------------------------------------------------------------------------------------------
CHECKPOINT SYSTEMS INC   COMMON    162825103    14,052     778,500  SH       SOLE                              778,500
----------------------------------------------------------------------------------------------------------------------------------
CHEVRONTEXACO CORP       COMMON    166764100     4,906      93,430  SH       SOLE                               74,900     18,530
----------------------------------------------------------------------------------------------------------------------------------
CHIQUITA BRANDS INTL     COMMON    170032809    15,519     703,500  SH       SOLE                              703,500
----------------------------------------------------------------------------------------------------------------------------------
CIRCUIT CITY STORES INC  COMMON    172737108     1,811     115,800  SH       SOLE                              115,800
----------------------------------------------------------------------------------------------------------------------------------
CITIGROUP INC            COMMON    172967101    12,311     255,527  SH       SOLE                              254,350      1,177
----------------------------------------------------------------------------------------------------------------------------------
COCA-COLA COMPANY        COMMON    191216100     9,217     150,850  SH       SOLE                              150,850
----------------------------------------------------------------------------------------------------------------------------------
CONAGRA FOODS INC        COMMON    205887102     4,217     143,200  SH       SOLE                              143,200
----------------------------------------------------------------------------------------------------------------------------------
COVENTRY HEALTH CARE     COMMON    222862104    19,847     373,900  SH       SOLE                              373,900
----------------------------------------------------------------------------------------------------------------------------------
CUMMINS INC              COMMON    231021106    26,193     312,600  SH       SOLE                              312,600
----------------------------------------------------------------------------------------------------------------------------------
D R HORTON INC           COMMON    23331A109    25,093     622,500  SH       SOLE                              622,500
----------------------------------------------------------------------------------------------------------------------------------
DANA CORP                COMMON    235811106    13,044     752,700  SH       SOLE                              752,700
----------------------------------------------------------------------------------------------------------------------------------
DICKS SPORTING GOODS INC COMMON    253393102    24,394     694,000  SH       SOLE                              694,000
----------------------------------------------------------------------------------------------------------------------------------
DONNELLEY (R R) & SONS 
CO                       COMMON    257867101     4,083     115,700  SH       SOLE                              115,700
----------------------------------------------------------------------------------------------------------------------------------
DOW CHEMICAL             COMMON    260543103     4,015      81,100  SH       SOLE                               81,100
----------------------------------------------------------------------------------------------------------------------------------
DU PONT (E I) DE NEMOURS COMMON    263534109    13,237     269,860  SH       SOLE                              267,950      1,910
----------------------------------------------------------------------------------------------------------------------------------
EARTHLINK INC            COMMON    270321102    17,406   1,510,900  SH       SOLE                            1,510,900
----------------------------------------------------------------------------------------------------------------------------------





Page 3 of 7


                                                     FORM 13F INFORMATION TABLE
                                              Name of Reporting Manager:   Hennessy Advisors, Inc.

      Column 1:         Column 2:  Column 3:   Column 4:     Column 5:              Column 6:        Column 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 
----------------------------------------------------------------------------------------------------------------------------------
                                                                                             

----------------------------------------------------------------------------------------------------------------------------------
EMERSON ELECTRIC         COMMON    291011104     1,441      20,550  SH       SOLE                                          20,550
----------------------------------------------------------------------------------------------------------------------------------
EXXON MOBIL CORPORATION  COMMON    30231G102     9,430     183,961  SH       SOLE                              175,675      8,286
----------------------------------------------------------------------------------------------------------------------------------
FANNIE MAE               COMMON    313586109     4,023      56,500  SH       SOLE                               56,500
----------------------------------------------------------------------------------------------------------------------------------
FINISH LINE INC          CLASS A   317923100    18,891   1,032,300  SH       SOLE                            1,032,300
----------------------------------------------------------------------------------------------------------------------------------
FMC TECHNOLOGIES INC     COMMON    30249U101     1,671      51,900  SH       SOLE                               51,900
----------------------------------------------------------------------------------------------------------------------------------
FOOT LOCKER INC          COMMON    344849104    17,728     658,300  SH       SOLE                              658,300
----------------------------------------------------------------------------------------------------------------------------------
FORD MOTOR CO            COMMON    345370860     4,074     278,246  SH       SOLE                              277,600        646
----------------------------------------------------------------------------------------------------------------------------------
GENERAL ELECTRIC CO.     COMMON    369604103     9,477     259,638  SH       SOLE                              251,200      8,438
----------------------------------------------------------------------------------------------------------------------------------
GENERAL MILLS INC        COMMON    370334104     4,071      81,900  SH       SOLE                               81,900
----------------------------------------------------------------------------------------------------------------------------------
GENERAL MOTORS CORP      COMMON    370442105    11,124     277,684  SH       SOLE                              276,050      1,634
----------------------------------------------------------------------------------------------------------------------------------
GOODYEAR TIRE & RUBBER 
CO                       COMMON    382550101     2,303     157,100  SH       SOLE                              157,100
----------------------------------------------------------------------------------------------------------------------------------
HARRIS CORP              COMMON    413875105     1,959      31,700  SH       SOLE                               31,700
----------------------------------------------------------------------------------------------------------------------------------
HEINZ (H J) CO           COMMON    423074103     4,055     104,000  SH       SOLE                              104,000
----------------------------------------------------------------------------------------------------------------------------------
HENNESSY ADVISORS INC    COMMON    425885100    27,246   1,009,120  SH       SOLE                                        1,009,120
----------------------------------------------------------------------------------------------------------------------------------
HONEYWELL INTERNATIONAL 
INC                      COMMON    438516106       517      12,300  SH       SOLE                               12,300
----------------------------------------------------------------------------------------------------------------------------------
HSBC HOLDINGS PLC          ADR     404280406     4,010      47,100  SH       SOLE                               47,100
----------------------------------------------------------------------------------------------------------------------------------
HUGHES SUPPLY INC        COMMON    444482103     1,805      55,800  SH       SOLE                               55,800
----------------------------------------------------------------------------------------------------------------------------------
INFINEON TECHNLGIES AG     ADR     45662N103    12,309   1,129,300  SH       SOLE                            1,129,300
----------------------------------------------------------------------------------------------------------------------------------
INFINITY PROPERTY & CAS 
CORP                     COMMON    45665Q103    16,829     478,100  SH       SOLE                              478,100
----------------------------------------------------------------------------------------------------------------------------------
INTL PAPER CO            COMMON    460146103    12,174     304,475  SH       SOLE                              302,350      2,125
----------------------------------------------------------------------------------------------------------------------------------
J P MORGAN CHASE & CO    COMMON    46625H100     4,429     112,970  SH       SOLE                              111,025      1,945
----------------------------------------------------------------------------------------------------------------------------------
JLG INDUSTRIES INC       COMMON    466210101    20,352   1,036,800  SH       SOLE                            1,036,800
----------------------------------------------------------------------------------------------------------------------------------
JOY GLOBAL INC           COMMON    481165108    29,611     681,800  SH       SOLE                              681,800
----------------------------------------------------------------------------------------------------------------------------------





Page 4 of 7


                                                     FORM 13F INFORMATION TABLE
                                              Name of Reporting Manager:   Hennessy Advisors, Inc.

      Column 1:         Column 2:  Column 3:   Column 4:     Column 5:              Column 6:        Column 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 
----------------------------------------------------------------------------------------------------------------------------------
                                                                                             

----------------------------------------------------------------------------------------------------------------------------------
KERR-MCGEE CORP          COMMON    492386107     3,901      67,500  SH       SOLE                               67,500
----------------------------------------------------------------------------------------------------------------------------------
KIMBERLY-CLARK CORP      COMMON    494368103     4,108      62,426  SH       SOLE                               61,300      1,126
----------------------------------------------------------------------------------------------------------------------------------
KMART HOLDING CORP       COMMON    498780105     1,989      20,100  SH       SOLE                               20,100
----------------------------------------------------------------------------------------------------------------------------------
LABOR READY INC          COMMON    505401208    20,549   1,214,500  SH       SOLE                            1,214,500
----------------------------------------------------------------------------------------------------------------------------------
LILLY (ELI) & CO         COMMON    532457108     3,961      69,800  SH       SOLE                               69,800
----------------------------------------------------------------------------------------------------------------------------------
LINCOLN NATIONAL CORP    COMMON    534187109     3,893      83,400  SH       SOLE                               83,400
----------------------------------------------------------------------------------------------------------------------------------
LONE STAR TECHNOLOGIES   COMMON    542312103     1,606      48,000  SH       SOLE                               48,000
----------------------------------------------------------------------------------------------------------------------------------
LOUISIANA-PACIFIC CORP   COMMON    546347105    21,451     802,200  SH       SOLE                              802,200
----------------------------------------------------------------------------------------------------------------------------------
LYONDELL CHEMICAL CO     COMMON    552078107     2,403      83,100  SH       SOLE                               83,100
----------------------------------------------------------------------------------------------------------------------------------
MARATHON OIL CORP        COMMON    565849106     4,039     107,400  SH       SOLE                              107,400
----------------------------------------------------------------------------------------------------------------------------------
MARSH & MCLENNAN COS     COMMON    571748102     4,152     126,200  SH       SOLE                              126,200
----------------------------------------------------------------------------------------------------------------------------------
MASSEY ENERGY CO         COMMON    576206106     2,083      59,600  SH       SOLE                               59,600
----------------------------------------------------------------------------------------------------------------------------------
MAVERICK TUBE CORP       COMMON    577914104     1,733      57,200  SH       SOLE                               57,200
----------------------------------------------------------------------------------------------------------------------------------
MAY DEPARTMENT STORES CO COMMON    577778103     4,081     138,800  SH       SOLE                              138,800
----------------------------------------------------------------------------------------------------------------------------------
MCDERMOTT INTL INC       COMMON    580037109    26,907   1,465,500  SH       SOLE                            1,465,500
----------------------------------------------------------------------------------------------------------------------------------
MEADWESTVACO CORP        COMMON    583334107     4,107     121,200  SH       SOLE                              121,200
----------------------------------------------------------------------------------------------------------------------------------
MERCK & CO               COMMON    589331107     4,506     141,053  SH       SOLE                              139,400      1,653
----------------------------------------------------------------------------------------------------------------------------------
NATIONAL CITY CORP       COMMON    635405103     4,029     107,300  SH       SOLE                              107,300
----------------------------------------------------------------------------------------------------------------------------------
NAVISTAR INTERNATIONL    COMMON    63934E108    14,417     327,800  SH       SOLE                              327,800
----------------------------------------------------------------------------------------------------------------------------------
NORDSTROM INC            COMMON    655664100    20,215     432,600  SH       SOLE                              432,600
----------------------------------------------------------------------------------------------------------------------------------
NUCOR CORP               COMMON    670346105     1,994      38,100  SH       SOLE                               38,100
----------------------------------------------------------------------------------------------------------------------------------
ORBITAL SCIENCES CORP    COMMON    685564106    14,778   1,249,200  SH       SOLE                            1,249,200
----------------------------------------------------------------------------------------------------------------------------------
OXFORD INDUSTRIES INC    COMMON    691497309    17,866     432,600  SH       SOLE                              432,600
----------------------------------------------------------------------------------------------------------------------------------





Page 5 of 7


                                                     FORM 13F INFORMATION TABLE
                                              Name of Reporting Manager:   Hennessy Advisors, Inc.

      Column 1:         Column 2:  Column 3:   Column 4:     Column 5:              Column 6:        Column 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 
----------------------------------------------------------------------------------------------------------------------------------
                                                                                             

----------------------------------------------------------------------------------------------------------------------------------
P G & E CORP             COMMON    69331C108       206       6,200  SH       SOLE                                           6,200
----------------------------------------------------------------------------------------------------------------------------------
PACIFICARE HEALTH SYS    COMMON    695112102    29,492     521,800  SH       SOLE                              521,800
----------------------------------------------------------------------------------------------------------------------------------
PEABODY ENERGY CORP      COMMON    704549104     2,330      28,800  SH       SOLE                               28,800
----------------------------------------------------------------------------------------------------------------------------------
PENN NATIONAL GAMING INC COMMON    707569109     2,585      42,700  SH       SOLE                               42,700
----------------------------------------------------------------------------------------------------------------------------------
PFIZER INC               COMMON    717081103     3,970     147,650  SH       SOLE                              145,500      2,150
----------------------------------------------------------------------------------------------------------------------------------
PILGRIMS PRIDE CORP      COMMON    721467108    30,297     987,500  SH       SOLE                              987,500
----------------------------------------------------------------------------------------------------------------------------------
PITNEY BOWES INC         COMMON    724479100     4,073      88,000  SH       SOLE                               88,000
----------------------------------------------------------------------------------------------------------------------------------
PNC FINANCIAL SVCS GROUP 
INC                      COMMON    693475105     4,124      71,800  SH       SOLE                               71,800
----------------------------------------------------------------------------------------------------------------------------------
PPG INDUSTRIES INC       COMMON    693506107     4,035      59,200  SH       SOLE                               59,200
----------------------------------------------------------------------------------------------------------------------------------
PREMCOR INC              COMMON    74045Q104     1,915      45,400  SH       SOLE                               45,400
----------------------------------------------------------------------------------------------------------------------------------
PRIMUS TELECOMM GROUP 
INC                      COMMON    741929103     4,244   1,334,600  SH       SOLE                            1,334,600
----------------------------------------------------------------------------------------------------------------------------------
PULTE HOMES INC          COMMON    745867101     1,716      26,900  SH       SOLE                               26,900
----------------------------------------------------------------------------------------------------------------------------------
QUANTA SERVICES INC      COMMON    74762E102    15,541   1,942,600  SH       SOLE                            1,942,600
----------------------------------------------------------------------------------------------------------------------------------
QUIKSILVER INC           COMMON    74838C106     1,936      65,000  SH       SOLE                               65,000
----------------------------------------------------------------------------------------------------------------------------------
REGIONS FINL CORP        COMMON    7591EP100     4,022     113,000  SH       SOLE                              113,000
----------------------------------------------------------------------------------------------------------------------------------
RITE AID CORP            COMMON    767754104    10,523   2,875,100  SH       SOLE                            2,875,100
----------------------------------------------------------------------------------------------------------------------------------
RYDER SYSTEM INC         COMMON    783549108     1,772      37,100  SH       SOLE                               37,100
----------------------------------------------------------------------------------------------------------------------------------
SAFEGUARD SCIENTIFICS 
INC                      COMMON    786449108     6,192   2,920,700  SH       SOLE                            2,920,700
----------------------------------------------------------------------------------------------------------------------------------
SANMINA-SCI CORP         COMMON    800907107     9,374   1,106,700  SH       SOLE                            1,106,700
----------------------------------------------------------------------------------------------------------------------------------
SARA LEE CORP            COMMON    803111103     3,962     164,128  SH       SOLE                              162,900      1,228
----------------------------------------------------------------------------------------------------------------------------------
SBC COMMUNICATIONS INC   COMMON    78387G103    13,074     507,321  SH       SOLE                              495,825     11,496
----------------------------------------------------------------------------------------------------------------------------------
SCANSOURCE INC           COMMON    806037107    18,847     303,200  SH       SOLE                              303,200
----------------------------------------------------------------------------------------------------------------------------------
SIERRA HEALTH SERVICES   COMMON    826322109    33,342     605,000  SH       SOLE                              605,000
----------------------------------------------------------------------------------------------------------------------------------






Page 6 of 7


                                                     FORM 13F INFORMATION TABLE
                                              Name of Reporting Manager:   Hennessy Advisors, Inc.

      Column 1:         Column 2:  Column 3:   Column 4:     Column 5:              Column 6:        Column 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 
----------------------------------------------------------------------------------------------------------------------------------
                                                                                             

----------------------------------------------------------------------------------------------------------------------------------
SIERRA PACIFIC RESOURCES COMMON    826428104    23,759   2,262,800  SH       SOLE                            2,262,800
----------------------------------------------------------------------------------------------------------------------------------
SOLECTRON CORP           COMMON    834182107    11,469   2,151,700  SH       SOLE                            2,151,700
----------------------------------------------------------------------------------------------------------------------------------
STEEL DYNAMICS INC       COMMON    858119100     1,803      47,600  SH       SOLE                               47,600
----------------------------------------------------------------------------------------------------------------------------------
SUNOCO INC               COMMON    86764P109     1,977      24,200  SH       SOLE                               24,200
----------------------------------------------------------------------------------------------------------------------------------
TBC CORP                 COMMON    872183108    16,205     582,900  SH       SOLE                              582,900
----------------------------------------------------------------------------------------------------------------------------------
TELEFONICA DE ARGENTINA  
CONT                       ADR     879991024         0      12,900  SH       SOLE                               12,900
---------------------------------------------------------------------------------------------------------------------------------
TELEFONICA DE ARGENTINA  
CONT                       ADR     879991016         0      12,900  SH       SOLE                               12,900
----------------------------------------------------------------------------------------------------------------------------------
TELEFONOS DE MEX           ADR     879403780     4,395     114,700  SH       SOLE                              114,700
----------------------------------------------------------------------------------------------------------------------------------
TELESYSTEM INTL WIRELESS 
INC                        ADR     879946606    15,826   1,414,300  SH       SOLE                            1,414,300
----------------------------------------------------------------------------------------------------------------------------------
TEREX CORP               COMMON    880779103     2,092      43,900  SH       SOLE                               43,900
----------------------------------------------------------------------------------------------------------------------------------
TESORO PETROLEUM CORP    COMMON    881609101    36,534   1,146,700  SH       SOLE                            1,146,700
----------------------------------------------------------------------------------------------------------------------------------
TOTAL SA  -ADR             ADR     89151E109     4,053      36,900  SH       SOLE                               36,900
----------------------------------------------------------------------------------------------------------------------------------
U G I CORPORATION        COMMON    902681105       344       8,400  SH       SOLE                                           8,400
----------------------------------------------------------------------------------------------------------------------------------
U S BANCORP              COMMON    902973304     4,196     133,975  SH       SOLE                              133,900         75
----------------------------------------------------------------------------------------------------------------------------------
USG CORP                 COMMON    903293405    37,407     928,900  SH       SOLE                              928,900
----------------------------------------------------------------------------------------------------------------------------------
VALERO ENERGY CORP       COMMON    91913Y100     2,043      45,000  SH       SOLE                               45,000
----------------------------------------------------------------------------------------------------------------------------------
VERIZON COMMUNICATIONS   COMMON    92343V104     5,833     143,997  SH       SOLE                              129,750     14,247
----------------------------------------------------------------------------------------------------------------------------------
WABASH NATIONAL CORP     COMMON    929566107    16,546     614,400  SH       SOLE                              614,400
----------------------------------------------------------------------------------------------------------------------------------
WACHOVIA CORP            COMMON    929903102     3,835      72,900  SH       SOLE                               72,900
----------------------------------------------------------------------------------------------------------------------------------
WASHINGTON MUTUAL INC    COMMON    939322103     4,082      96,550  SH       SOLE                               96,100        450
----------------------------------------------------------------------------------------------------------------------------------
WELLS FARGO & CO         COMMON    949746101     5,057      81,364  SH       SOLE                               63,200     18,164
----------------------------------------------------------------------------------------------------------------------------------
WESTAMERICA BANCORP      COMMON    957090103       627      10,749  SH       SOLE                                          10,749
----------------------------------------------------------------------------------------------------------------------------------
WESTERN WIRELESS CORP    CLASS A   95988E204    20,554     701,500  SH       SOLE                              701,500
----------------------------------------------------------------------------------------------------------------------------------





Page 7 of 7


                                                     FORM 13F INFORMATION TABLE
                                              Name of Reporting Manager:   Hennessy Advisors, Inc.

      Column 1:         Column 2:  Column 3:   Column 4:     Column 5:              Column 6:        Column 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 
----------------------------------------------------------------------------------------------------------------------------------
                                                                                             

----------------------------------------------------------------------------------------------------------------------------------
WILLIAM LYON HOMES       COMMON    552074106    19,323     275,100  SH       SOLE                              275,100
----------------------------------------------------------------------------------------------------------------------------------
XL CAPITAL LTD             ADR      2283401      3,890      50,100  SH       SOLE                               50,100
----------------------------------------------------------------------------------------------------------------------------------
                TOTAL                        1,358,256
----------------------------------------------------------------------------------------------------------------------------------