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

                                    Form 13F

                               Form 13F COVER PAGE

Report for the Calendar Year or Quarter Ended:  March 31, 2010
                                                --------------

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                  April 22, 2010
--------------------------------------------------------------------------------
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:                    215
                                                 ----------------------

Form 13F Information Table Value Total:                  $695,938
                                                 ----------------------
                                                       (thousands)

List of Other Included Managers:  NONE



Page 1 of 10                                                          03/31/2010


                                                     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
------------------------------------------------------------------------------------------------------------------------------------
                                                                                               
3M CO                         COM       88579Y101     1,705   20,400    SH      SOLE                       20,400
99 CENTS ONLY STORES          COM       65440K106       584   35,800    SH      SOLE                       35,800
A T & T INC                   COM       00206R102     7,145  276,500    SH      SOLE                      276,500
AARON'S INC                   COM       002535201       527   15,800    SH      SOLE                       15,800
ACERGY SA -ADR                ADR       00443E104     4,854  264,400    SH      SOLE                      264,400
ADVANCE AMER CASH ADVANCE CT  COM       00739W107     3,966  681,370    SH      SOLE                      681,370
ADVANCED MICRO DEVICES        COM       007903107     5,147  555,200    SH      SOLE                      555,200
AEROPOSTALE INC               COM       007865108     4,312  149,550    SH      SOLE                      149,550
ALLIED HEALTHCARE INTL INC    COM       01923A109        38   13,920    SH      SOLE                       13,920
ALTRIA GROUP INC              COM       02209S103     3,213  156,600    SH      SOLE                      156,600
AMERICAN AXLE & MFG HOLDINGS  COM       024061103     5,828  584,000    SH      SOLE                      584,000
AMERICAN EXPRESS COMPANY      COM       025816109       392    9,500    SH      SOLE                        9,500
AMERICREDIT CORP              COM       03060R101    11,181  470,600    SH      SOLE                      470,600
APAC CUSTOMER SERVICES INC    COM       00185E106       587  102,050    SH      SOLE                      102,050
AUTOMATIC DATA PROCESSING     COM       053015103     3,233   72,700    SH      SOLE                       72,700
AVON PRODUCTS                 COM       054303102     1,771   52,300    SH      SOLE                       52,300
BAKER (MICHAEL) CORP          COM       057149106       410   11,900    SH      SOLE                       11,900
BAKER HUGHES INC              COM       057224107     1,410   30,100    SH      SOLE                       30,100
BALL CORP                     COM       058498106     4,580   85,800    SH      SOLE                       85,800
BCE INC                       ADR       05534B760     3,481  118,600    SH      SOLE                      118,600
BEST BUY CO INC               COM       086516101     1,229   28,900    SH      SOLE                       28,900
BIG 5 SPORTING GOODS CORP     COM       08915P101     3,728  244,950    SH      SOLE                      244,950
BIO REFERENCE LABS            COM       09057G602       677   15,400    SH      SOLE                       15,400



Page 2 of 10                                                          03/31/2010

                                                     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
------------------------------------------------------------------------------------------------------------------------------------
                                                                                               
BLACK BOX CORP                COM       091826107       409   13,300    SH      SOLE                       13,300
BOEING CO                     COM       097023105     9,301  128,100    SH      SOLE                      128,100
BP PLC  -ADS                  ADR       055622104     3,127   54,800    SH      SOLE                       54,800
BRASKEM SA  -ADR              ADR       105532105     3,979  275,000    SH      SOLE                      275,000
BRISTOL MYERS SQUIBB          COM       110122108     3,188  119,400    SH      SOLE                      119,400
BROADRIDGE FINANCIAL SOLUTNS  COM       11133T103     4,135  193,400    SH      SOLE                      193,400
BRUNSWICK CORP                COM       117043109     6,032  377,700    SH      SOLE                      377,700
BUCYRUS INTERNATIONAL INC     COM       118759109     5,081   77,000    SH      SOLE                       77,000
BWAY HOLDING CO               COM       12429T104       647   32,180    SH      SOLE                       32,180
CALAVO GROWERS INC            COM       128246105       441   24,200    SH      SOLE                       24,200
CALUMET SPECIALTY PRODS  -LP UT LTD
                             PARTNER    131476103     4,437  213,300    SH      SOLE                      213,300
CAMERON INTERNATIONAL CORP    COM       13342B105     1,774   41,400    SH      SOLE                       41,400
CAMPBELL SOUP CO              COM       134429109     3,295   93,200    SH      SOLE                       93,200
CANTEL MEDICAL CORP           COM       138098108       597   30,100    SH      SOLE                       30,100
CARDTRONICS INC               COM       14161H108     4,299  342,000    SH      SOLE                      342,000
CARMAX INC                    COM       143130102     5,049  201,000    SH      SOLE                      201,000
CARTER'S INC                  COM       146229109     5,599  185,700    SH      SOLE                      185,700
CATERPILLAR INC               COM       149123101     1,892   30,100    SH      SOLE                       30,100
CENTRAL GARDEN & PET CO       COM       153527205       463   50,500    SH      SOLE                       50,500
CHEVRON CORP                  COM       166764100     8,281  109,200    SH      SOLE                      109,200
CHINA MOBILE LTD  -ADR        ADR       16941M109     3,224   67,000    SH      SOLE                       67,000


Page 3 of 10                                                          03/31/2010

                                                     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
------------------------------------------------------------------------------------------------------------------------------------
                                                                                               
CIA BRASILERIA-SP ADR         ADR       20440T201     4,020   59,800    SH      SOLE                       59,800
CIGNA CORP                    COM       125509109     4,444  121,500    SH      SOLE                      121,500
COACH INC                     COM       189754104     2,458   62,200    SH      SOLE                       62,200
COCA-COLA BTLNG CONS          COM       191098102       516    8,800    SH      SOLE                        8,800
COCA-COLA COMPANY             COM       191216100     1,001   18,200    SH      SOLE                       18,200
COCA-COLA ENTERPRISES INC     COM       191219104     5,654  204,400    SH      SOLE                      204,400
COMPUTER SCIENCES CORP        COM       205363104     4,664   85,600    SH      SOLE                       85,600
CONAGRA FOODS INC             COM       205887102     3,482  138,900    SH      SOLE                      138,900
CONOCOPHILLIPS                COM       20825C104     1,264   24,700    SH      SOLE                       24,700
CONSOL ENERGY INC             COM       20854P109     1,386   32,500    SH      SOLE                       32,500
COOPER COMPANIES INC          COM       216648402     4,557  117,200    SH      SOLE                      117,200
COOPER INDUSTRIES LTD         COM       G24140108     1,889   39,400    SH      SOLE                       39,400
COTT CORP QUE                 ADR       22163N106     4,532  584,800    SH      SOLE                      584,800
CUBIC CORP                    COM       229669106       493   13,700    SH      SOLE                       13,700
CUMMINS INC                   COM       231021106     2,466   39,800    SH      SOLE                       39,800
DARDEN RESTAURANTS INC        COM       237194105     5,376  120,700    SH      SOLE                      120,700
DCP MIDSTREAM PARTNERS LP    COM UT
                             LTD PTN    23311P100     5,191  161,500    SH      SOLE                      161,500
DEL MONTE FOODS CO            COM       24522P103     5,395  369,500    SH      SOLE                      369,500
DELL INC                      COM       24702R101     1,421   94,600    SH      SOLE                       94,600
DENBURY RESOURCES INC         COM       247916208     1,005   59,600    SH      SOLE                       59,600
DIAGEO PLC  -ADR              ADR       25243Q205     3,042   45,100    SH      SOLE                       45,100
DIAMOND OFFSHRE DRILLING INC  COM       25271C102     1,252   14,100    SH      SOLE                       14,100



Page 4 of 10                                                          03/31/2010

                                                     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
------------------------------------------------------------------------------------------------------------------------------------
                                                                                               
DISH NETWORK CORP             COM       25470M109     1,880   90,300    SH      SOLE                       90,300
DOLLAR THRIFTY AUTOMOTIVE GP  COM       256743105     1,603   49,900    SH      SOLE                       49,900
DOLLAR TREE INC               COM       256746108     5,004   84,500    SH      SOLE                       84,500
DONNELLEY (R R) & SONS CO     COM       257867101     3,040  142,400    SH      SOLE                      142,400
DOT HILL SYSTEMS CORP         COM       25848T109        32   21,730    SH      SOLE                       21,730
DRUGSTORE.COM INC             COM       262241102        48   13,420    SH      SOLE                       13,420
DU PONT (E I) DE NEMOURS      COM       263534109     8,494  228,100    SH      SOLE                      228,100
DYNAVAX TECHNOLOGIES CORP     COM       268158102        32   24,890    SH      SOLE                       24,890
EATON CORP                    COM       278058102     3,682   48,600    SH      SOLE                       48,600
EMERGENCY MEDICAL SVCS CORP   COM       29100P102     5,022   88,800    SH      SOLE                       88,800
EMERSON ELECTRIC CO           COM       291011104     5,467  108,600    SH      SOLE                      108,600
ENCORE CAPITAL GROUP INC      COM       292554102     4,371  265,700    SH      SOLE                      265,700
ENI SPA  -ADR                 ADR       26874R108     2,966   63,200    SH      SOLE                       63,200
ENSCO INTERNATIONAL PLC       ADR       29358Q109     1,487   33,200    SH      SOLE                       33,200
EOG RESOURCES INC             COM       26875P101     1,403   15,100    SH      SOLE                       15,100
EVERCORE PARTNERS INC         COM       29977A105       744   24,800    SH      SOLE                       24,800
EXXON MOBIL CORP              COM       30231G102       944   14,100    SH      SOLE                       14,100
FIRST HORIZON NATIONAL CORP   COM       320517105       562   40,000    SH      SOLE                       40,000
FLUOR CORP                    COM       343412102     1,191   25,600    SH      SOLE                       25,600
FORCE PROTECTION INC          COM       345203202       374   62,100    SH      SOLE                       62,100
FORD MOTOR CO                 COM       345370860     5,655  449,900    SH      SOLE                      449,900
FOREST LABORATORIES  -CL A  CLASS A     345838106     1,386   44,200    SH      SOLE                       44,200
FUQI INTERNATIONAL INC        ADR       36102A207       327   29,970    SH      SOLE                       29,970



Page 5 of 10                                                          03/31/2010

                                                     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
------------------------------------------------------------------------------------------------------------------------------------
                                                                                               
GAP INC                       COM       364760108     1,803   78,000    SH      SOLE                       78,000
GENCORP INC                   COM       368682100     2,779  482,500    SH      SOLE                      482,500
GENERAL DYNAMICS CORP         COM       369550108     1,915   24,800    SH      SOLE                       24,800
GLAXOSMITHKLINE PLC  -ADR     ADR       37733W105     2,835   73,600    SH      SOLE                       73,600
GLOBAL CASH ACCESS HOLDINGS   COM       378967103     4,964  607,600    SH      SOLE                      607,600
GOODRICH CORP                 COM       382388106     7,666  108,700    SH      SOLE                      108,700
GSI COMMERCE INC              COM       36238G102     4,798  173,100    SH      SOLE                      173,100
GYMBOREE CORP                 COM       403777105     4,746   91,900    SH      SOLE                       91,900
HALLIBURTON CO                COM       406216101     1,672   55,500    SH      SOLE                       55,500
HEINZ (H J) CO                COM       423074103     3,339   73,200    SH      SOLE                       73,200
HERSHEY CO                    COM       427866108     3,733   87,200    SH      SOLE                       87,200
HESS CORP                     COM       42809H107       945   15,100    SH      SOLE                       15,100
HHGREGG INC                   COM       42833L108     5,644  223,600    SH      SOLE                      223,600
HOME DEPOT INC                COM       437076102     7,217  223,100    SH      SOLE                      223,100
HONEYWELL INTERNATIONAL INC   COM       438516106     1,571   34,700    SH      SOLE                       34,700
HUNTSMAN CORP                 COM       447011107     4,924  408,600    SH      SOLE                      408,600
INTEL CORP                    COM       458140100     4,204  188,600    SH      SOLE                      188,600
INTL BUSINESS MACHINES CORP   COM       459200101     1,295   10,100    SH      SOLE                       10,100
ISLE OF CAPRI CASINOS INC     COM       464592104       305   39,200    SH      SOLE                       39,200
ITT CORP                      COM       450911102     1,330   24,800    SH      SOLE                       24,800
J & J SNACK FOODS CORP        COM       466032109       587   13,500    SH      SOLE                       13,500



Page 6 of 10                                                          03/31/2010

                                                     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
------------------------------------------------------------------------------------------------------------------------------------
                                                                                               
JO-ANN STORES INC             COM       47758P307     5,172  123,200    SH      SOLE                      123,200
JOE'S JEANS INC               COM       47777N101        58   22,110    SH      SOLE                       22,110
JOHNSON & JOHNSON             COM       478160104     1,467   22,500    SH      SOLE                       22,500
JOS A BANK CLOTHIERS INC      COM       480838101       859   15,700    SH      SOLE                       15,700
KAPSTONE PAPER & PACKAGING    COM       48562P103     6,147  517,890    SH      SOLE                      517,890
KBR INC                       COM       48242W106     4,219  190,400    SH      SOLE                      190,400
KIMBERLY-CLARK CORP           COM       494368103     3,056   48,600    SH      SOLE                       48,600
KIRKLAND'S INC                COM       497498105     6,552  311,980    SH      SOLE                      311,980
KNOLOGY INC                   COM       499183804     5,294  393,900    SH      SOLE                      393,900
KRAFT FOODS INC               COM       50075N104     7,624  252,100    SH      SOLE                      252,100
KRISPY KREME DOUGHNUTS INC    COM       501014104        53   13,230    SH      SOLE                       13,230
LANCASTER COLONY CORP         COM       513847103     5,525   93,700    SH      SOLE                       93,700
LA-Z-BOY INC                  COM       505336107     5,317  424,000    SH      SOLE                      424,000
LILLY (ELI) & CO              COM       532457108     1,040   28,700    SH      SOLE                       28,700
LIMITED BRANDS INC            COM       532716107     4,008  162,800    SH      SOLE                      162,800
LINCOLN EDUCATIONAL SERVICES  COM       533535100       655   25,900    SH      SOLE                       25,900
LINN ENERGY LLC               COM       536020100     5,036  195,800    SH      SOLE                      195,800
LOCKHEED MARTIN CORP          COM       539830109     4,502   54,100    SH      SOLE                       54,100
LUMBER LIQUIDATORS HOLDINGS
  INC                         COM       55003T107     4,195  157,300    SH      SOLE                      157,300
M & F WORLDWIDE CORP          COM       552541104     3,724  121,700    SH      SOLE                      121,700
MADDEN STEVEN LTD             COM       556269108       888   18,200    SH      SOLE                       18,200
MARATHON OIL CORP             COM       565849106     4,369  138,100    SH      SOLE                      138,100



Page 7 of 10                                                          03/31/2010

                                                     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
------------------------------------------------------------------------------------------------------------------------------------
                                                                                               
MARSH & MCLENNAN COS          COM       571748102     3,465  141,900    SH      SOLE                      141,900
MARTEN TRANSPORT LTD          COM       573075108       447   22,700    SH      SOLE                       22,700
MASSEY ENERGY CO              COM       576206106     5,543  106,000    SH      SOLE                      106,000
MASTERCARD INC                COM       57636Q104     1,524    6,000    SH      SOLE                        6,000
MATTEL INC                    COM       577081102     3,513  154,500    SH      SOLE                      154,500
MCDONALD'S CORP               COM       580135101     6,899  103,400    SH      SOLE                      103,400
MCGRAW-HILL COMPANIES         COM       580645109     1,761   49,400    SH      SOLE                       49,400
MEADWESTVACO CORP             COM       583334107     2,859  111,900    SH      SOLE                      111,900
MERCK & CO                    COM       58933Y105     8,669  232,100    SH      SOLE                      232,100
MOBILE TELESYSTEMS - SP ADR   ADR       607409109     3,541   63,800    SH      SOLE                       63,800
MOSAIC CO                     COM       61945A107     1,367   22,500    SH      SOLE                       22,500
MURPHY OIL CORP               COM       626717102     1,096   19,500    SH      SOLE                       19,500
MYLAN INC                     COM       628530107     6,491  285,800    SH      SOLE                      285,800
NATIONAL PRESTO INDS INC      COM       637215104       737    6,200    SH      SOLE                        6,200
NCI INC                       COM       62886K104       469   15,500    SH      SOLE                       15,500
NETWORK ENGINES INC           COM       64121A107        51   27,240    SH      SOLE                       27,240
NEWMARKET CORP                COM       651587107     8,940   86,800    SH      SOLE                       86,800
NOKIA CORP  -ADR              ADR       654902204     3,841  247,200    SH      SOLE                      247,200
NU SKIN ENTERPRISES  -CL A   CLASS A    67018T105     4,257  146,300    SH      SOLE                      146,300
NUCOR CORP                    COM       670346105     4,316   95,100    SH      SOLE                       95,100
NUSTAR ENERGY LP             UNIT COM   67058H102       568    9,400    SH      SOLE                        9,400
OCCIDENTAL PETROLEUM CORP     COM       674599105     1,395   16,500    SH      SOLE                       16,500



Page 8 of 10                                                          03/31/2010

                                                     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
------------------------------------------------------------------------------------------------------------------------------------
                                                                                               
OMNICOM GROUP                 COM       681919106     1,525   39,300    SH      SOLE                       39,300
OMNOVA SOLUTIONS INC          COM       682129101     4,779  608,810    SH      SOLE                      608,810
O'REILLY AUTOMOTIVE INC       COM       686091109     4,613  110,600    SH      SOLE                      110,600
P F CHANGS CHINA BISTRO INC   COM       69333Y108       680   15,400    SH      SOLE                       15,400
PATRIOT COAL CORP             COM       70336T104     6,469  316,200    SH      SOLE                      316,200
PEET'S COFFEE & TEA INC       COM       705560100       737   18,600    SH      SOLE                       18,600
PEP BOYS-MANNY MOE & JACK     COM       713278109       511   50,800    SH      SOLE                       50,800
PFIZER INC                    COM       717081103     7,136  416,100    SH      SOLE                      416,100
PHILIP MORRIS INTERNATIONAL   COM       718172109     3,302   63,300    SH      SOLE                       63,300
PITNEY BOWES INC              COM       724479100     4,342  177,600    SH      SOLE                      177,600
PLAINS ALL AMER PIPELNE -LP  UNIT LTD
                             PARTN      726503105     4,928   86,600    SH      SOLE                       86,600
PPG INDUSTRIES INC            COM       693506107     3,486   53,300    SH      SOLE                       53,300
PRECISION CASTPARTS CORP      COM       740189105     2,065   16,300    SH      SOLE                       16,300
PROVIDENCE SERVICE CORP       COM       743815102     4,203  276,700    SH      SOLE                      276,700
REGENCY ENERGY PARTNERS LP  COM UNITS
                              L P       75885Y107     4,605  209,800    SH      SOLE                      209,800
REHABCARE GROUP INC           COM       759148109       584   21,400    SH      SOLE                       21,400
REVLON INC  -CL A            CLASS A    761525609     3,270  220,200    SH      SOLE                      220,200
REYNOLDS AMERICAN INC         COM       761713106     3,125   57,900    SH      SOLE                       57,900
ROCK-TENN CO                  COM       772739207     4,429   97,200    SH      SOLE                       97,200
ROCKWELL COLLINS INC          COM       774341101     1,865   29,800    SH      SOLE                       29,800
ROSS STORES INC               COM       778296103     4,727   88,400    SH      SOLE                       88,400
ROYAL DUTCH SHELL PLC  -ADR   ADR       780259206     3,067   53,000    SH      SOLE                       53,000



Page 9 of 10                                                          03/31/2010

                                                     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
------------------------------------------------------------------------------------------------------------------------------------
                                                                                               
SANMINA-SCI CORP              COM       800907206     7,961  482,500    SH      SOLE                      482,500
SARA LEE CORP                 COM       803111103     3,591  257,800    SH      SOLE                      257,800
SCHLUMBERGER LTD              COM       806857108     1,428   22,500    SH      SOLE                       22,500
SCHWEITZER-MAUDUIT INTL INC   COM       808541106     4,014   84,400    SH      SOLE                       84,400
SCOTTS MIRACLE-GRO CO         COM       810186106     4,797  103,500    SH      SOLE                      103,500
SPARTAN MOTORS INC            COM       846819100       251   44,900    SH      SOLE                       44,900
STIFEL FINANCIAL CORP         COM       860630102       570   10,600    SH      SOLE                       10,600
STURM RUGER & CO INC          COM       864159108       462   38,500    SH      SOLE                       38,500
SUNOCO LOGISTICS PRTNRS L P   COM       86764L108       617    9,000    SH      SOLE                        9,000
SXC HEALTH SOLUTIONS CORP     COM       78505P100     6,311   93,800    SH      SOLE                       93,800
SYSCO CORP                    COM       871829107     3,316  112,400    SH      SOLE                      112,400
TAIWAN SEMICONDUCTOR  -ADR    ADR       874039100     2,906  277,000    SH      SOLE                      277,000
TECH DATA CORP                COM       878237106     8,476  202,300    SH      SOLE                      202,300
TELEFONICA SA  -ADR           ADR       879382208     2,659   37,400    SH      SOLE                       37,400
TELVENT GIT SA                ADR       E90215109     3,460  120,300    SH      SOLE                      120,300
TETRA TECH INC                COM       88162G103     3,659  158,800    SH      SOLE                      158,800
TEXAS INSTRUMENTS INC         COM       882508104     1,449   59,200    SH      SOLE                       59,200
TEXAS ROADHOUSE INC           COM       882681109       610   43,900    SH      SOLE                       43,900
TIM PARTICIPACOES SA  -ADR    ADR       88706P106     3,992  143,800    SH      SOLE                      143,800
TJX COMPANIES INC             COM       872540109     1,612   37,900    SH      SOLE                       37,900
TOTAL SA  -ADR                ADR       89151E109     2,924   50,400    SH      SOLE                       50,400
TRACTOR SUPPLY CO             COM       892356106     5,114   88,100    SH      SOLE                       88,100



Page 10 of 10                                                         03/31/2010

                                                     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
------------------------------------------------------------------------------------------------------------------------------------
                                                                                               
TUPPERWARE BRANDS CORP        COM       899896104     5,304  110,000    SH      SOLE                      110,000
ULTA SALON COSMETCS & FRAG    COM       90384S303     5,037  222,700    SH      SOLE                      222,700
UNISYS CORP                   COM       909214306     4,330  124,100    SH      SOLE                      124,100
UNITED NATURAL FOODS INC      COM       911163103       543   19,300    SH      SOLE                       19,300
UNITED PARCEL SERVICE INC     COM       911312106     3,420   53,100    SH      SOLE                       53,100
UNITED TECHNOLOGIES CORP      COM       913017109     1,700   23,100    SH      SOLE                       23,100
USA MOBILITY INC              COM       90341G103       502   39,600    SH      SOLE                       39,600
VERIZON COMMUNICATIONS        COM       92343V104     7,243  233,500    SH      SOLE                      233,500
VIRGIN MEDIA INC              COM       92769L101    10,330  598,500    SH      SOLE                      598,500
VIVO PARTICIPACOES SA -ADR    ADR       92855S200     3,427  126,400    SH      SOLE                      126,400
VODAFONE GROUP PLC  -ADR      ADR       92857W209     3,207  137,600    SH      SOLE                      137,600
WASTE MANAGEMENT INC          COM       94106L109     3,212   93,300    SH      SOLE                       93,300
WATSON PHARMACEUTICALS INC    COM       942683103     4,983  119,300    SH      SOLE                      119,300
WESTELL TECH INC  -CL A     CLASS A     957541105        42   29,600    SH      SOLE                       29,600
WESTERN DIGITAL CORP          COM       958102105     2,109   54,100    SH      SOLE                       54,100
WORLD FUEL SERVICES CORP      COM       981475106     5,509  206,800    SH      SOLE                      206,800
XL CAPITAL LTD                ADR       G98255105     4,162  220,200    SH      SOLE                      220,200
                        TOTAL                       695,938