Notice of Securities Transaction by Insider

Kimberly S. Chaney, a director at ACNB Corp, acquired 182.2686 shares of ACNB Corporation Common stock on June 15, 2026, at a price of $56.51 per share. This acquisition, valued at approximately $10,305, brings her post-transaction share total to 4,052.5487. The shares were received as compensation for her services as a director. Additionally, Chaney has a total of 6,022.51 shares held in a revocable trust. The transaction was executed on June 16, 2026, and reported on June 17, 2026, in compliance with SEC Rule 16a-3(g)(2) and (g)(4).