X0306 5 2020-12-31 0 0 0 0000715579 ACNB CORP ACNB 0001362780 Cathell David W 16 LINCOLN SQUARE GETTYSBURG PA 17325 0 1 0 0 EVP, Treasurer & CFO ACNB Corporation Common 17383.7966 D The amount of securities beneficially owned includes 146.1221 aggregate shares of common stock acquired in 2020 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/ David W. Cathell 2021-02-12