X0306 5 2017-12-31 0 0 0 0000715579 ACNB CORP ACNB 0001362780 Cathell David W 465 IDAVILLE YORK SPRINGS ROAD GARDNERS PA 17324 0 1 0 0 EVP, Treasurer & CFO ACNB Corporation Common 14153.5879 D The amount of securities beneficially owned was increased to include 57.64874 aggregate shares of common stock acquired in 2017 through the automatic reinvestment of dividends, which are exempt from the reporting requirements of Section 16 of the Securities Exchange Act of 1934. /s/ David W. Cathell 2018-02-13