144 0001710898 XXXXXXXX LIVE 0000715579 ACNB CORP 001-35015 16 LINCOLN SQUARE P O BOX 3129 GETTYSBURG PA 17325 7173343161 Seibel Donald Arthur Jr Director Common Fidelity Brokerage Services LLC Common

245 Summer Street Boston MA 02110

1500 97515.00 10212044 08/06/2026 NASDAQ Common 09/15/2021 Stock Award Issuer N 127 09/15/2021 Compensation Common 06/15/2021 Stock Award Issuer N 125 06/15/2021 Compensation Common 03/15/2021 Stock Award Issuer N 107 03/15/2021 Compensation Common 12/15/2020 Stock Award Issuer N 124 12/15/2020 Compensation Common 09/15/2020 Stock Award Issuer N 156 09/15/2020 Compensation Common 06/15/2020 Stock Award Issuer N 127 06/15/2020 Compensation Common 03/13/2020 Stock Award Issuer N 137 03/13/2020 Compensation Common 12/31/2019 Stock Award Issuer N 167 12/31/2019 Compensation Common 09/13/2019 Stock Award Issuer N 88 09/13/2019 Compensation Common 06/14/2019 Stock Award Issuer N 89 06/14/2019 Compensation Common 06/14/2019 Stock Award Issuer N 65 06/14/2019 Compensation Common 03/15/2019 Stock Award Issuer N 63 03/15/2019 Compensation Common 12/14/2018 Stock Award Issuer N 64 12/14/2018 Compensation Common 09/14/2018 Stock Award Issuer N 59 09/14/2018 Compensation Common 06/15/2018 Stock Award Issuer N 12 06/15/2018 Compensation Y 08/07/2026 /s/ Ariadna Gonzalez as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Seibel Donald Arthur Jr