Regulation FD Disclosure On August 5, 2026, the Company issued a press release announcing that it had declared a cash dividend of $0.15 per share on its common stock. The cash dividend is payable September 3, 2026, to shareholders of record at the close of business on August 20, 2026. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

Results of Operations and Financial Condition On August 5, 2026, Hennessy Advisors, Inc. (the “ Company ”) issued a press release announcing its financial results for the fiscal quarter ended June 30, 2026. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

of this Current Report on Form 8-K relating to the Redemption and the Notice are for informational purposes only and do not constitute an offer to buy or a solicitation of an offer to sell any Notes and shall not constitute an offer, solicitation, or sale in any jurisdiction in which such offering, solicitation or sale would be unlawful. Such information is not a notice of redemption with respect to the Notes, and any redemption will be or has been made in accordance with the terms of the ind…

Results of Operations and Financial Condition On May 6, 2026, Hennessy Advisors, Inc. (the “ Company ”) issued a press release announcing its financial results for the fiscal quarter ended March 31, 2026. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

Regulation FD Disclosure On May 6, 2026, the Company issued a press release announcing that it had declared a cash dividend of $0.15 per share on its common stock. The cash dividend is payable June 4, 2026, to shareholders of record at the close of business on May 21, 2026. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

Results of Operations and Financial Condition On February 5, 2026, Hennessy Advisors, Inc. (the “ Company ”) issued a press release announcing its financial results for the fiscal quarter ended December 31, 2025. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

Regulation FD Disclosure On February 5, 2026, the Company issued a press release announcing that it had declared a cash dividend of $0.15 per share on its common stock. The cash dividend is payable March 4, 2026, to shareholders of record at the close of business on February 18, 2026. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

of this Current Report on Form 8-K. EXHIBIT INDEX Exhibit Description 99.1 Press release. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURES Pursuant to the requirements of the Securities 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. December 3, 2025 By: /s/ Teresa M. Nilsen Teresa M. Nilsen President

Results of Operations and Financial Condition On August 6, 2025, Hennessy Advisors, Inc. (the “ Company ”) issued a press release announcing its financial results for the fiscal quarter ended June 30, 2025. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

Regulation FD Disclosure On August 6, 2025, the Company issued a press release announcing that it had declared a cash dividend of $0.1375 per share on its common stock. The cash dividend is payable September 4, 2025, to shareholders of record at the close of business on August 20, 2025. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

Regulation FD Disclosure On May 7, 2025, the Company issued a press release announcing that it had declared a cash dividend of $0.1375 per share on its common stock. The cash dividend is payable June 4, 2025, to shareholders of record at the close of business on May 20, 2025. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

Results of Operations and Financial Condition On May 7, 2025, Hennessy Advisors, Inc. (the “ Company ”) issued a press release announcing its financial results for the fiscal quarter ended March 31, 2025. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

Results of Operations and Financial Condition On February 13, 2025, Hennessy Advisors, Inc. (the “ Company ”) issued a press release announcing its financial results for the fiscal quarter ended December 31, 2024. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

Regulation FD Disclosure On February 13, 2025, the Company issued a press release announcing that it had declared a cash dividend of $0.1375 per share on its common stock. The cash dividend is payable March 6, 2025, to shareholders of record at the close of business on February 24, 2025. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

Changes in Registrant ’ s Certifying Accountant. On December 10, 2024, Hennessy Advisors, Inc. (the “Company”) was notified by Marcum LLP (“Marcum”) that Marcum was declining to stand for reelection as the Company’s independent registered public accounting firm. On November 1, 2024, CBIZ CPAs P.C. acquired the attest business of Marcum. On December 11, 2024, Marcum resigned as auditors of the Company and with the approval of the Audit Committee of the Company’s Board of Directors, CBIZ CPAs P…

of this Current Report on Form 8-K. EXHIBIT INDEX Exhibit Description 99.1 Press release. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURES Pursuant to the requirements of the Securities 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. December 11, 2024 By: /s/ Teresa M. Nilsen Teresa M. Nilsen President

Results of Operations and Financial Condition On August 8, 2024, Hennessy Advisors, Inc. (the “ Company ”) issued a press release announcing its financial results for the fiscal quarter ended June 30, 2024. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

Regulation FD Disclosure On August 8, 2024, the Company issued a press release announcing that it had declared a cash dividend of $0.1375 per share on its common stock. The cash dividend is payable September 5, 2024, to shareholders of record at the close of business on August 22, 2024. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

Regulation FD Disclosure On May 8, 2024, the Company issued a press release announcing that it had declared a cash dividend of $0.1375 per share on its common stock. The cash dividend is payable June 5, 2024, to shareholders of record at the close of business on May 22, 2024. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

Results of Operations and Financial Condition On May 8, 2024, Hennessy Advisors, Inc. (the “ Company ”) issued a press release announcing its financial results for the fiscal quarter ended March 31, 2024. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein. --09-30

Other Events. On February 23, 2024, Hennessy Advisors, Inc. completed the acquisition (the “ Acquisition ”) of certain assets related to the management of the CCM Core Impact Equity Fund. The Acquisition was consummated in accordance with the terms and conditions of the previously announced Transaction Agreement, dated as of April 26, 2023. At the closing of the Acquisition, the CCM Core Impact Equity Fund was reorganized into the Hennessy Stance ESG ETF. A copy of the press release is being…

Regulation FD Disclosure On February 8, 2024, the Company issued a press release announcing that it had declared a cash dividend of $0.1375 per share on its common stock. The cash dividend is payable March 4, 2024, to shareholders of record at the close of business on February 20, 2024. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

Results of Operations and Financial Condition On February 8, 2024, Hennessy Advisors, Inc. issued a press release announcing its financial results for the fiscal quarter ended December 31, 2023. A copy of the press release is being furnished as Exhibit 99.1 to this Current Report on Form 8‑K and is incorporated by reference herein.

of this Current Report on Form 8-K. EXHIBIT INDEX Exhibit Description 99.1 Press release. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURES Pursuant to the requirements of the Securities 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. December 6, 2023 By: /s/ Teresa M. Nilsen Teresa M. Nilsen President

Other Events. On November 10, 2023, Hennessy Advisors, Inc. completed the acquisition (the “ Acquisition ”) of certain assets related to the management of the CCM Small/Mid-Cap Impact Value Fund. The Acquisition was consummated in accordance with the terms and conditions of the previously announced Transaction Agreement, dated as of April 26, 2023 (the “ Transaction Agreement ”). At the closing of the Acquisition, the CCM Small/Mid-Cap Impact Value Fund was reorganized into the Hennessy Stanc…