X0306 4 2017-08-10 0 0000715579 ACNB CORP ACNB 0001225042 HELT JAMES 360 THORNHILL DRIVE HANOVER PA 17331 1 1 0 0 President & CEO ACNB Corporation Common 2017-08-10 4 P 0 500 26.4833 A 7642.7334 D The amount of securities beneficially owned was increased to include 21.349307 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/ James P. Helt 2017-08-14