X0306 4 2017-09-15 0 0000715579 ACNB CORP ACNB 0001271480 ELSNER FRANK III 894 LAUREL WOODS LANE HANOVER PA 17331 1 0 0 1 Chairman of the Board ACNB Corporation Common 2017-09-15 2017-09-19 4 P 0 9.2678 26.975 A 18014.0388 D ACNB Corporation Common 2017-09-15 2017-09-19 4 P 0 83.4106 26.975 A 18109.6232 D The date of execution was determined in accordance with SEC Rule 16a-3(g)(2) and (g)(4). The amount of securities beneficially owned includes 11.273401 shares of common stock purchased for the same Transaction Date of September 15, 2017, 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. The amount of securities beneficially owned includes 12.173865 shares of common stock purchased for the same Transaction Date of September 15, 2017, 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/ James P. Helt as POA for Frank Elsner III 2017-09-20