---------------------------------------
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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:   June 30, 2006
                                                ------------------

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:  7250 Redwood Boulevard, Suite 200
          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                  July 24, 2006
--------------------------------------------------------------------------------
Teresa M. Nilsen                      City, State                      Date


Report Type  (Check only one):

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

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

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






                              FORM 13F SUMMARY PAGE



Report Summary:


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

Form 13F Information Table Entry Total:                       165
                                                 ----------------------

Form 13F Information Table Value Total:                $2,171,424
                                                 ----------------------
                                                       (thousands)



List of Other Included Managers:  NONE







Page 1 of 8                                                           06/30/2006


                                                     FORM 13F INFORMATION TABLE

                                         Name of Reporting Manager: Hennessy Advisors, Inc.

                                                                                                    Column
      Column 1:         Column 2:    Column 3:   Column 4:    Column 5:              Column 6:         7:         Column 8:
----------------------------------------------------------------------------------------------------------------------------------
                          Title                   Market
                           of         CUSIP       Value       Shares or                              Other
    Name of Issuer        Class       Number    (x$1,000)  Principal Amount  Investment Discretion   Mgrs.    Voting Authority
----------------------------------------------------------------------------------------------------------------------------------
                                                                    SH/ Put/        Shared   Shared
                                                                    PRN Call Sole  Defined   Other         Sole    Shared  None
----------------------------------------------------------------------------------------------------------------------------------
                                                                                             
A T & T INC               COMMON     00206R102       12,076   432,971 SH     SOLE                             424,775          8,196
------------------------------------------------------------------------------------------------------------------------------------
AAR CORP                  COMMON     000361105       21,314   958,800 SH     SOLE                             958,800              0
------------------------------------------------------------------------------------------------------------------------------------
ACERGY S A -ADR            ADR       00443E104        7,684   502,200 SH     SOLE                             502,200              0
------------------------------------------------------------------------------------------------------------------------------------
ADVANCE AUTO PARTS INC    COMMON     00751Y106        3,153   109,100 SH     SOLE                             109,100              0
------------------------------------------------------------------------------------------------------------------------------------
AETNA INC                 COMMON     00817Y108        4,524   113,300 SH     SOLE                             113,300              0
------------------------------------------------------------------------------------------------------------------------------------
ALERIS INTERNATIONAL INC  COMMON     014477103       32,200   702,300 SH     SOLE                             702,300              0
------------------------------------------------------------------------------------------------------------------------------------
ALLEGHENY TECHNOLOGIES
INC                       COMMON     01741R102       60,287   870,700 SH     SOLE                             870,700              0
------------------------------------------------------------------------------------------------------------------------------------
ALTRIA GROUP INC          COMMON     02209S103       10,895   148,368 SH     SOLE                             147,925            443
------------------------------------------------------------------------------------------------------------------------------------
AMERCO                    COMMON     023586100       43,817   435,300 SH     SOLE                             435,300              0
------------------------------------------------------------------------------------------------------------------------------------
ANDERSONS INC             COMMON     034164103       11,443   275,000 SH     SOLE                             275,000              0
------------------------------------------------------------------------------------------------------------------------------------
ASTEC INDUSTRIES INC      COMMON     046224101       24,467   717,100 SH     SOLE                             717,100              0
------------------------------------------------------------------------------------------------------------------------------------
BADGER METER INC          COMMON     056525108        6,215   230,200 SH     SOLE                             230,200              0
------------------------------------------------------------------------------------------------------------------------------------
BANCO BRADESCO SA  -ADR    ADR       059460303       22,836   734,500 SH     SOLE                             734,500              0
------------------------------------------------------------------------------------------------------------------------------------
BANCO ITAU HLDG FINCIERA
-ADR                       ADR       059602201       25,897   888,100 SH     SOLE                             888,100              0
------------------------------------------------------------------------------------------------------------------------------------
BANK of AMERICA CORP      COMMON     060505104        4,107    85,387 SH     SOLE                              74,000         11,387
------------------------------------------------------------------------------------------------------------------------------------
BEACON ROOFING SUPPLY INC COMMON     073685109       25,811 1,172,700 SH     SOLE                           1,172,700              0
------------------------------------------------------------------------------------------------------------------------------------
BELLSOUTH CORP            COMMON     079860102        4,592   126,838 SH     SOLE                             123,100          3,738
------------------------------------------------------------------------------------------------------------------------------------
BERKLEY (W R) CORP        COMMON     084423102       24,403   715,000 SH     SOLE                             715,000              0
------------------------------------------------------------------------------------------------------------------------------------
BP PLC  -ADS               ADR       055622104        3,543    50,900 SH     SOLE                              50,600            300
------------------------------------------------------------------------------------------------------------------------------------
BRIGHTPOINT INC           COMMON     109473405       19,711 1,460,040 SH     SOLE                           1,460,040              0
------------------------------------------------------------------------------------------------------------------------------------
BRISTOL MYERS SQUIBB      COMMON     110122108        4,125   159,500 SH     SOLE                             158,700            800
------------------------------------------------------------------------------------------------------------------------------------





Page 2 of 8                                                           06/30/2006


                                                     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
----------------------------------------------------------------------------------------------------------------------------------
                                                                                             
BUILDING MATERIALS HLDG
CP                        COMMON     120113105        4,922   176,600 SH     SOLE                             176,600              0
------------------------------------------------------------------------------------------------------------------------------------
CB RICHARD ELLIS GROUP
INC                       COMMON     12497T101       21,665   870,100 SH     SOLE                             849,100         21,000
------------------------------------------------------------------------------------------------------------------------------------
CHEMED CORP               COMMON     16359R103        6,124   112,300 SH     SOLE                             112,300              0
------------------------------------------------------------------------------------------------------------------------------------
CHEVRONTEXACO CORP        COMMON     166764100        4,553    73,357 SH     SOLE                              57,800         15,557
------------------------------------------------------------------------------------------------------------------------------------
CHILDRENS PLACE RETAIL
STRS                      COMMON     168905107        5,909    98,400 SH     SOLE                              98,400              0
------------------------------------------------------------------------------------------------------------------------------------
CHUNGHWA TELECOM CO  -ADR  ADR       17133Q205        3,546   192,000 SH     SOLE                             192,000              0
------------------------------------------------------------------------------------------------------------------------------------
CIRCUIT CITY STORES INC   COMMON     172737108       27,329 1,004,000 SH     SOLE                           1,004,000              0
------------------------------------------------------------------------------------------------------------------------------------
CITIGROUP INC             COMMON     172967101       10,806   223,975 SH     SOLE                             223,975              0
------------------------------------------------------------------------------------------------------------------------------------
CLEAN HARBORS INC         COMMON     184496107        8,509   211,100 SH     SOLE                             211,100              0
------------------------------------------------------------------------------------------------------------------------------------
CLEVELAND-CLIFFS INC      COMMON     185896107        7,485    94,400 SH     SOLE                              94,400              0
------------------------------------------------------------------------------------------------------------------------------------
CMS ENERGY CORP           COMMON     125896100        6,531   504,700 SH     SOLE                             504,700              0
------------------------------------------------------------------------------------------------------------------------------------
COCA-COLA COMPANY         COMMON     191216100        3,123    72,600 SH     SOLE                              72,600              0
------------------------------------------------------------------------------------------------------------------------------------
COMMERCIAL METALS         COMMON     201723103       12,912   502,400 SH     SOLE                             502,400              0
------------------------------------------------------------------------------------------------------------------------------------
CONAGRA FOODS INC         COMMON     205887102        3,732   168,800 SH     SOLE                             168,800              0
------------------------------------------------------------------------------------------------------------------------------------
CONN'S INC                COMMON     208242107       15,850   597,000 SH     SOLE                             597,000              0
------------------------------------------------------------------------------------------------------------------------------------
DAIMLERCHRYSLER AG         ADR     sedol - 2307389    3,278    66,400 SH     SOLE                              66,400              0
------------------------------------------------------------------------------------------------------------------------------------
DENNYS CORP               COMMON     24869P104        3,201   867,500 SH     SOLE                             867,500              0
------------------------------------------------------------------------------------------------------------------------------------
DIAGEO PLC  -ADR           ADR       25243Q205        3,850    57,000 SH     SOLE                              57,000              0
------------------------------------------------------------------------------------------------------------------------------------
DONNELLEY (R R) & SONS CO COMMON     257867101        3,166    99,100 SH     SOLE                              99,100              0
------------------------------------------------------------------------------------------------------------------------------------
DOW CHEMICAL              COMMON     260543103        2,970    76,100 SH     SOLE                              76,100              0
------------------------------------------------------------------------------------------------------------------------------------
DRESS BARN INC            COMMON     261570105       31,540 1,244,200 SH     SOLE                           1,244,200              0
------------------------------------------------------------------------------------------------------------------------------------





Page 3 of 8                                                           06/30/2006


                                                     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
----------------------------------------------------------------------------------------------------------------------------------
                                                                                             
DREW INDUSTRIES INC       COMMON     26168L205       26,186   808,200 SH     SOLE                             808,200              0
------------------------------------------------------------------------------------------------------------------------------------
DU PONT (E I) DE NEMOURS  COMMON     263534109       10,566   254,000 SH     SOLE                             254,000              0
------------------------------------------------------------------------------------------------------------------------------------
EMCOR GROUP INC           COMMON     29084Q100       30,988   636,700 SH     SOLE                             636,700              0
------------------------------------------------------------------------------------------------------------------------------------
ESCALA GROUP INC          COMMON     29605W107        5,170 1,104,700 SH     SOLE                           1,104,700              0
------------------------------------------------------------------------------------------------------------------------------------
EXPRESS SCRIPTS INC       COMMON     302182100       29,327   408,800 SH     SOLE                             408,800              0
------------------------------------------------------------------------------------------------------------------------------------
EXXON MOBIL CORPORATION   COMMON     30231G102          350     5,705 SH     SOLE                                   0          5,705
------------------------------------------------------------------------------------------------------------------------------------
FEDERAL HOME LOAN MORTG
CORP                      COMMON     313400301        3,056    53,600 SH     SOLE                              53,600              0
------------------------------------------------------------------------------------------------------------------------------------
FLOWSERVE CORP            COMMON     34354P105       13,298   233,700 SH     SOLE                             233,700              0
------------------------------------------------------------------------------------------------------------------------------------
FORD MOTOR CO             COMMON     345370860        2,881   415,746 SH     SOLE                             415,500            246
------------------------------------------------------------------------------------------------------------------------------------
FOSTER WHEELER LTD        COMMON   sedol B04MB31     25,000   578,700 SH     SOLE                             578,700              0
------------------------------------------------------------------------------------------------------------------------------------
FRONTIER OIL CORP         COMMON     35914P105       59,085 1,823,600 SH     SOLE                           1,823,600              0
------------------------------------------------------------------------------------------------------------------------------------
GEHL CO                   COMMON     368483103        4,616   180,800 SH     SOLE                             180,800              0
------------------------------------------------------------------------------------------------------------------------------------
GENERAL CABLE CORP/DE     COMMON     369300108       38,770 1,107,700 SH     SOLE                           1,107,700              0
------------------------------------------------------------------------------------------------------------------------------------
GENERAL ELECTRIC CO.      COMMON     369604103        4,046   122,751 SH     SOLE                             121,525          1,226
------------------------------------------------------------------------------------------------------------------------------------
GENERAL MOTORS CORP       COMMON     370442105       13,032   437,465 SH     SOLE                             437,100            365
------------------------------------------------------------------------------------------------------------------------------------
GENESCO INC               COMMON     371532102        4,166   123,000 SH     SOLE                             123,000              0
------------------------------------------------------------------------------------------------------------------------------------
GIANT INDUSTRIES INC      COMMON     374508109       28,184   423,500 SH     SOLE                             423,500              0
------------------------------------------------------------------------------------------------------------------------------------
GLAXOSMITHKLINE PLC  -ADR  ADR       37733W105        3,744    67,100 SH     SOLE                              67,100              0
------------------------------------------------------------------------------------------------------------------------------------
GOODYEAR TIRE & RUBBER CO COMMON     382550101        5,860   527,900 SH     SOLE                             527,900              0
------------------------------------------------------------------------------------------------------------------------------------
GREAT ATLANTIC & PAC TEA
CO                        COMMON     390064103       27,723 1,220,200 SH     SOLE                           1,220,200              0
------------------------------------------------------------------------------------------------------------------------------------
HEALTHCARE SERVICES GROUP COMMON     421906108        4,879   232,900 SH     SOLE                             232,900              0
------------------------------------------------------------------------------------------------------------------------------------





Page 4 of 8                                                           06/30/2006


                                                     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
----------------------------------------------------------------------------------------------------------------------------------
                                                                                             
HEINZ (H J) CO            COMMON     423074103        4,073    98,800 SH     SOLE                              98,800              0
------------------------------------------------------------------------------------------------------------------------------------
HENNESSY ADVISORS INC     COMMON     425885100       53,446 1,875,304 SH     SOLE                                   0      1,875,304
------------------------------------------------------------------------------------------------------------------------------------
HOLLY CORP                COMMON     435758305       58,563 1,215,000 SH     SOLE                           1,215,000              0
------------------------------------------------------------------------------------------------------------------------------------
HOVNANIAN ENTRPRS INC
-CL A                     CLASS A    442487203        2,178    72,400 SH     SOLE                              72,400              0
------------------------------------------------------------------------------------------------------------------------------------
HSBC HOLDINGS PLC  -ADR    ADR       404280406        3,737    42,300 SH     SOLE                              42,300              0
------------------------------------------------------------------------------------------------------------------------------------
HUMANA INC                COMMON     444859102       15,380   286,400 SH     SOLE                             286,400              0
------------------------------------------------------------------------------------------------------------------------------------
ING GROEP NV  -ADR         ADR       456837103        3,936   100,100 SH     SOLE                             100,100              0
------------------------------------------------------------------------------------------------------------------------------------
INTL PAPER CO             COMMON     460146103        3,256   100,800 SH     SOLE                             100,500            300
------------------------------------------------------------------------------------------------------------------------------------
IPSCO INC                  ADR       462622101       27,635   288,800 SH     SOLE                             288,800              0
------------------------------------------------------------------------------------------------------------------------------------
J P MORGAN CHASE & CO     COMMON     46625H100       11,603   276,265 SH     SOLE                             275,975            290
------------------------------------------------------------------------------------------------------------------------------------
JABIL CIRCUIT INC         COMMON     466313103       16,366   639,300 SH     SOLE                             639,300              0
------------------------------------------------------------------------------------------------------------------------------------
JACOBS ENGINEERING GROUP
INC                       COMMON     469814107        9,764   122,600 SH     SOLE                             122,600              0
------------------------------------------------------------------------------------------------------------------------------------
JLG INDUSTRIES INC        COMMON     466210101       40,475 1,798,900 SH     SOLE                           1,798,900              0
------------------------------------------------------------------------------------------------------------------------------------
KB HOME                   COMMON     48666K109        2,916    63,600 SH     SOLE                              63,600              0
------------------------------------------------------------------------------------------------------------------------------------
KIMBERLY-CLARK CORP       COMMON     494368103        3,673    59,526 SH     SOLE                              58,400          1,126
------------------------------------------------------------------------------------------------------------------------------------
KRAFT FOODS INC           COMMON     50075N104        3,594   116,300 SH     SOLE                             116,300              0
------------------------------------------------------------------------------------------------------------------------------------
LABOR READY INC           COMMON     505401208        7,194   317,600 SH     SOLE                             317,600              0
------------------------------------------------------------------------------------------------------------------------------------
LENNOX INTERNATIONAL INC  COMMON     526107107        8,211   310,100 SH     SOLE                             310,100              0
------------------------------------------------------------------------------------------------------------------------------------
LILLY (ELI) & CO          COMMON     532457108        3,515    63,600 SH     SOLE                              63,600              0
------------------------------------------------------------------------------------------------------------------------------------
LINCOLN NATIONAL CORP     COMMON     534187109        3,714    65,800 SH     SOLE                              65,800              0
------------------------------------------------------------------------------------------------------------------------------------
LONGS DRUG STORES CORP    COMMON     543162101        4,945   108,400 SH     SOLE                             108,400              0
------------------------------------------------------------------------------------------------------------------------------------





Page 5 of 8                                                           06/30/2006


                                                     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
----------------------------------------------------------------------------------------------------------------------------------
                                                                                             
LUBYS INC                 COMMON     549282101        4,066   389,800 SH     SOLE                             389,800              0
------------------------------------------------------------------------------------------------------------------------------------
LUFKIN INDUSTRIES INC     COMMON     549764108        7,655   128,800 SH     SOLE                             128,800              0
------------------------------------------------------------------------------------------------------------------------------------
LYONDELL CHEMICAL CO      COMMON     552078107        3,082   136,000 SH     SOLE                             136,000              0
------------------------------------------------------------------------------------------------------------------------------------
MANITOWOC CO              COMMON     563571108       35,952   807,900 SH     SOLE                             807,900              0
------------------------------------------------------------------------------------------------------------------------------------
MARATHON OIL CORP         COMMON     565849106       28,305   339,800 SH     SOLE                             339,800              0
------------------------------------------------------------------------------------------------------------------------------------
MATTEL INC                COMMON     577081102        3,401   206,000 SH     SOLE                             206,000              0
------------------------------------------------------------------------------------------------------------------------------------
MCDERMOTT INTL INC        COMMON     580037109       15,251   335,400 SH     SOLE                             335,400              0
------------------------------------------------------------------------------------------------------------------------------------
MEADWESTVACO CORP         COMMON     583334107        3,366   120,500 SH     SOLE                             120,500              0
------------------------------------------------------------------------------------------------------------------------------------
MENS WEARHOUSE INC        COMMON     587118100        4,097   135,200 SH     SOLE                             135,200              0
------------------------------------------------------------------------------------------------------------------------------------
MERCK & CO                COMMON     589331107       12,629   346,664 SH     SOLE                             346,175            489
------------------------------------------------------------------------------------------------------------------------------------
MERITAGE HOMES CORP       COMMON     59001A102        2,788    59,000 SH     SOLE                              59,000              0
------------------------------------------------------------------------------------------------------------------------------------
MULTI-FINELINE ELECTRON
INC                       COMMON     62541B101        8,450   254,600 SH     SOLE                             254,600              0
------------------------------------------------------------------------------------------------------------------------------------
NATIONAL CITY CORP        COMMON     635405103        3,583    99,000 SH     SOLE                              99,000              0
------------------------------------------------------------------------------------------------------------------------------------
NORDSTROM INC             COMMON     655664100       22,126   606,200 SH     SOLE                             606,200              0
------------------------------------------------------------------------------------------------------------------------------------
NS GROUP, INC.            COMMON     628916108        7,755   140,800 SH     SOLE                             140,800              0
------------------------------------------------------------------------------------------------------------------------------------
OFFICE DEPOT INC          COMMON     676220106       10,507   276,500 SH     SOLE                             276,500              0
------------------------------------------------------------------------------------------------------------------------------------
OIL STATES INTL INC       COMMON     678026105       30,009   875,400 SH     SOLE                             875,400              0
------------------------------------------------------------------------------------------------------------------------------------
ON SEMICONDUCTOR CORP     COMMON     682189105       20,535 3,492,400 SH     SOLE                           3,492,400              0
------------------------------------------------------------------------------------------------------------------------------------
P G & E CORP              COMMON     69331C108          236     6,005 SH     SOLE                                   0          6,005
------------------------------------------------------------------------------------------------------------------------------------
PALM INC                  COMMON     696643105       22,178 1,377,500 SH     SOLE                           1,377,500              0
------------------------------------------------------------------------------------------------------------------------------------
PANTRY INC                COMMON     698657103       32,786   569,800 SH     SOLE                             569,800              0
------------------------------------------------------------------------------------------------------------------------------------





Page 6 of 8                                                           06/30/2006


                                                     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
----------------------------------------------------------------------------------------------------------------------------------
                                                                                             
PAPA JOHNS INTERNATIONAL
INC                       COMMON     698813102       24,402   735,000 SH     SOLE                             735,000              0
------------------------------------------------------------------------------------------------------------------------------------
PAR TECHNOLOGY CORP       COMMON     698884103        3,033   237,500 SH     SOLE                             237,500              0
------------------------------------------------------------------------------------------------------------------------------------
PAYLESS SHOESOURCE INC    COMMON     704379106       27,879 1,026,100 SH     SOLE                           1,026,100              0
------------------------------------------------------------------------------------------------------------------------------------
PETRO-CANADA               ADR       71644E102       26,976   569,000 SH     SOLE                             569,000              0
------------------------------------------------------------------------------------------------------------------------------------
PFIZER INC                COMMON     717081103       10,881   463,601 SH     SOLE                             461,275          2,326
------------------------------------------------------------------------------------------------------------------------------------
PHILLIPS-VAN HEUSEN CORP  COMMON     718592108        5,377   140,900 SH     SOLE                             140,900              0
------------------------------------------------------------------------------------------------------------------------------------
PIONEER COS INC  -CL A    LASS A     723643300        5,783   212,000 SH     SOLE                             212,000              0
------------------------------------------------------------------------------------------------------------------------------------
PITNEY BOWES INC          COMMON     724479100        3,358    81,300 SH     SOLE                              81,300              0
------------------------------------------------------------------------------------------------------------------------------------
PLAYTEX PRODUCTS INC      COMMON     72813P100       18,936 1,815,500 SH     SOLE                           1,815,500              0
------------------------------------------------------------------------------------------------------------------------------------
PLEXUS CORP               COMMON     729132100       35,089 1,025,700 SH     SOLE                           1,025,700              0
------------------------------------------------------------------------------------------------------------------------------------
PNC FINANCIAL SVCS GROUP
INC                       COMMON     693475105        3,733    53,200 SH     SOLE                              53,200              0
------------------------------------------------------------------------------------------------------------------------------------
PPG INDUSTRIES INC        COMMON     693506107        3,848    58,300 SH     SOLE                              58,300              0
------------------------------------------------------------------------------------------------------------------------------------
QUANEX CORP               COMMON     747620102       14,131   328,100 SH     SOLE                             328,100              0
------------------------------------------------------------------------------------------------------------------------------------
QUANTA SERVICES INC       COMMON     74762E102       43,013 2,482,000 SH     SOLE                           2,482,000              0
------------------------------------------------------------------------------------------------------------------------------------
REGIONS FINL CORP         COMMON     7591EP100        3,329   100,500 SH     SOLE                             100,500              0
------------------------------------------------------------------------------------------------------------------------------------
RELIANCE STEEL & ALUMINUM
CO                        COMMON     759509102       31,023   374,000 SH     SOLE                             374,000              0
------------------------------------------------------------------------------------------------------------------------------------
REYNOLDS AMERICAN INC     COMMON     761713106        4,243    36,800 SH     SOLE                              36,800              0
------------------------------------------------------------------------------------------------------------------------------------
RIVIERA HOLDINGS CORP     COMMON     769627100        3,915   193,800 SH     SOLE                             193,800              0
------------------------------------------------------------------------------------------------------------------------------------
RYERSON INC               COMMON     78375P107       24,419   904,400 SH     SOLE                             904,400              0
------------------------------------------------------------------------------------------------------------------------------------
RYLAND GROUP INC          COMMON     783764103        2,754    63,200 SH     SOLE                              63,200              0
------------------------------------------------------------------------------------------------------------------------------------
SARA LEE CORP             COMMON     803111103        3,052   190,528 SH     SOLE                             189,300          1,228
------------------------------------------------------------------------------------------------------------------------------------





Page 7 of 8                                                           06/30/2006


                                                     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
----------------------------------------------------------------------------------------------------------------------------------
                                                                                             
SEABOARD CORP             COMMON     811543107        3,584     2,800 SH     SOLE                               2,800              0
------------------------------------------------------------------------------------------------------------------------------------
SEARS HOLDINGS CORP       COMMON     812350106        4,814    31,000 SH     SOLE                              31,000              0
------------------------------------------------------------------------------------------------------------------------------------
SHAW GROUP INC            COMMON     820280105       15,621   561,900 SH     SOLE                             561,900              0
------------------------------------------------------------------------------------------------------------------------------------
SIERRA PACIFIC RESOURCES  COMMON     826428104        7,659   547,100 SH     SOLE                             547,100              0
------------------------------------------------------------------------------------------------------------------------------------
SIX FLAGS INC             COMMON     83001P109       13,315 2,369,200 SH     SOLE                           2,369,200              0
------------------------------------------------------------------------------------------------------------------------------------
SKYWEST INC               COMMON     830879102        7,606   306,700 SH     SOLE                             306,700              0
------------------------------------------------------------------------------------------------------------------------------------
SPARTAN STORES INC        COMMON     846822104        4,752   324,800 SH     SOLE                             324,800              0
------------------------------------------------------------------------------------------------------------------------------------
STANDARD PACIFIC CP       COMMON     85375C101        2,768   107,700 SH     SOLE                             107,700              0
------------------------------------------------------------------------------------------------------------------------------------
SUNOCO INC                COMMON     86764P109       19,013   274,400 SH     SOLE                             274,400              0
------------------------------------------------------------------------------------------------------------------------------------
SYKES ENTERPRISES INC     COMMON     871237103        7,917   489,900 SH     SOLE                             489,900              0
------------------------------------------------------------------------------------------------------------------------------------
SYNAGRO TECHNOLOGIES INC  COMMON     871562203        3,750   954,200 SH     SOLE                             954,200              0
------------------------------------------------------------------------------------------------------------------------------------
TELEFONICA DE ARGENTINA
CONT                       ADR       879991024            0    12,900 SH     SOLE                              12,900              0
------------------------------------------------------------------------------------------------------------------------------------
TELEFONICA DE ARGENTINA
CONT                       ADR       879991016            0    12,900 SH     SOLE                              12,900              0
------------------------------------------------------------------------------------------------------------------------------------
TELEFONOS DE MEX  -SPON
ADR                        ADR       879403780        3,060   146,900 SH     SOLE                             146,900              0
------------------------------------------------------------------------------------------------------------------------------------
TESORO PETROLEUM CORP     COMMON     881609101       25,610   344,400 SH     SOLE                             344,400              0
------------------------------------------------------------------------------------------------------------------------------------
THE CHARLES SCHWAB CORP   COMMON     808513105          161    10,100 SH     SOLE                                   0         10,100
------------------------------------------------------------------------------------------------------------------------------------
TRAMMELL CROW CO          COMMON     89288R106        6,725   191,200 SH     SOLE                             191,200              0
------------------------------------------------------------------------------------------------------------------------------------
TRANSMONTAIGNE INC        COMMON     893934109        4,595   409,900 SH     SOLE                             409,900              0
------------------------------------------------------------------------------------------------------------------------------------
TRINITY INDUSTRIES        COMMON     896522109       32,645   808,050 SH     SOLE                             808,050              0
------------------------------------------------------------------------------------------------------------------------------------
TRW AUTOMOTIVE HOLDINGS
CORP                      COMMON     87264S106        7,854   287,900 SH     SOLE                             287,900              0
------------------------------------------------------------------------------------------------------------------------------------
U G I CORPORATION NEW     COMMON     902681105          414    16,800 SH     SOLE                                   0         16,800
------------------------------------------------------------------------------------------------------------------------------------





Page 8 of 8                                                           06/30/2006


                                                     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
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U S BANCORP               COMMON     902973304        3,486   112,875 SH     SOLE                             112,800             75
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USG CORP                  COMMON     903293405       33,453   458,700 SH     SOLE                             458,700              0
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VALERO ENERGY CORP        COMMON     91913Y100       35,528   534,100 SH     SOLE                             534,100              0
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VERIZON COMMUNICATIONS    COMMON     92343V104       11,623   347,060 SH     SOLE                             333,700         13,360
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VODAFONE GROUP PLC  -ADR   ADR       92857W100        3,287   154,325 SH     SOLE                             150,500          3,825
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WABTEC CORP               COMMON     929740108       32,396   866,200 SH     SOLE                             866,200              0
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WACHOVIA CORP             COMMON     929903102        3,483    64,400 SH     SOLE                              64,400              0
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WALTER INDUSTRIES INC     COMMON     93317Q105        9,991   173,300 SH     SOLE                             173,300              0
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WASHINGTON MUTUAL INC     COMMON     939322103        3,728    81,800 SH     SOLE                              81,800              0
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WATSCO INC                COMMON     942622200       22,074   369,000 SH     SOLE                             369,000              0
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WELLCARE HEALTH PLANS INC COMMON     94946T106       16,020   326,600 SH     SOLE                             326,600              0
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WELLS FARGO & CO          COMMON     949746101        4,661    69,490 SH     SOLE                              54,300         15,190
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WESTAMERICA BANCORP       COMMON     957090103          461     9,424 SH     SOLE                                   0          9,424
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WESTERN DIGITAL CORP      COMMON     958102105       29,174 1,472,700 SH     SOLE                           1,472,700              0
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WESTERN GAS RESOURCES INC COMMON     958259103        9,486   158,500 SH     SOLE                             158,500              0
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WEYERHAEUSER CO           COMMON     962166104        3,193    51,300 SH     SOLE                              51,300              0
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WORLD AIR HOLDINGS INC    COMMON     98142V104        3,256   379,000 SH     SOLE                             379,000              0
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XL CAPITAL LTD             ADR       G98255105        3,132    51,100 SH     SOLE                              51,100              0
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                    TOTAL                         2,171,424
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