ACNB CORP

COMMON STOCK REPURCHASE PROGRAM

GETTYSBURG, PA, June 18, 2025 --- ACNB Corporation (“ACNB”) (NASDAQ: ACNB), financial holding company for ACNB Bank and ACNB Insurance Services, Inc., announced today that the Board of Directors approved a new plan to repurchase, in open market transactions at prevailing market prices, up to 314,000, or approximately 3.0%, of the outstanding shares of ACNB’s common stock. The amount and timing of any shares repurchased will be evaluated and determined by management in its discretion and will depend upon a number of factors, including ACNB’s capital position, liquidity, financial performance and alternate uses of capital, the market price of ACNB’s securities, general market and economic conditions, and applicable legal and regulatory requirements, with no guarantee as to the exact number of shares that will be repurchased. The common stock repurchases are expected to be funded by using available capital. Further, this new common stock repurchase program replaces and supersedes any and all earlier announced repurchase plans.

ACNB Corporation, headquartered in Gettysburg, PA, is the independent $3.27 billion financial holding company for the wholly-owned subsidiaries of ACNB Bank, Gettysburg, PA, including its operating divisions Traditions Bank and Traditions Mortgage, and ACNB Insurance Services, Inc., Westminster, MD. Originally founded in 1857, ACNB Bank serves its marketplace with banking and wealth management services, including