FORM 8-K/A CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) December 30, 2004 ----------------- HENNESSY ADVISORS, INC. ----------------------- (Exact name of registrant as specified in its charter) California 000-49872 68-0176227 ---------- --------- ---------- (State or other jurisdiction (Commission (IRS Employer of incorporation) File Number) Identification No.) 750 Grant Avenue, Suite 100 94945 Novato, California ----- ------------------ (Address of principal executive offices) (Zip Code) Registrant's telephone number including area code: (415) 899-1555 -------------- Not Applicable -------------- (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: [ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230 .425) [ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) [ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) [ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) ================================================================================ Item 4.01 Changes In Registrant's Certifying Accountant On January 6, 2005, Hennessy Advisors, Inc. filed a Form 8-K disclosing a change in auditors. This amendment is being filed for the purpose of filing as an exhibit the required letter of the former auditors, Pisenti & Brinker, LLP. Item 9.01 Financial Statements and Exhibits (c) Exhibits 16 Letter of Pisenti & Brinker, LLP, dated January 12, 2005 regarding change in certifying accountant 2 SIGNATURES Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. HENNESSY ADVISORS, INC. (registrant) January 18, 2005 By: /s/ Teresa M. Nilsen ------------------------------------- Teresa M. Nilsen Chief Financial Officer and Executive Vice President 3