X0609 4 2026-09-15 0 0000715579 ACNB CORP ACNB 0001710848 Herring Todd L false 16 LINCOLN SQUARE GETTYSBURG PA 17325 1 0 0 1 Vice Chairman of the Board 0 ACNB Corporation Common 2026-09-15 2026-09-16 4 A 0 210.5989 65.29 A 11326.637 D ACNB Corporation Common 1196.7693 I Trust ACNB Corporation Common 1052 I Spouse The date of execution was determined in accordance with SEC Rule 16a-3(g)(2) and (g)(4). The shares represent stock received as compensation for service as a director pursuant to a director compensation plan. This amount includes shares of common stock purchased for the same transaction date through the automatic reinvestment of dividends under the ACNB Corporation Dividend Reinvestment and Stock Purchase Plan, which are exempt from the reporting requirements of Section 16 of the Securities Exchange Act of 1934. /s/ Kevin J. Hayes as POA for Todd L. Herring 2026-09-17