X0609 4 2026-09-15 0 0000715579 ACNB CORP ACNB 0001271480 ELSNER FRANK III false 16 LINCOLN SQUARE GETTYSBURG PA 17325 1 0 0 0 0 ACNB Corporation Common 2026-09-15 2026-09-16 4 A 0 157.7577 65.29 A 29052.1094 D ACNB Corporation Common 2026-09-15 2026-09-16 4 P 0 3.8291 65.29 A 29071.0964 D 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 Frank Elsner, III 2026-09-17