144 0001243211 XXXXXXXX LIVE 0000036029 FIRST FINANCIAL BANKSHARES, INC. 000-07674 400 Pine Street Abilene TX 79601 325-627-7155 DUESER F SCOTT Officer Director Common Stock First Financial Trust & Asset Management Company

400 Pine St Suite 300 Abilene TX 79601

36000 1482480 142910170 12/12/2024 NASDAQ Common Stock 09/14/1993 Open Market Purchase Open Market Purchase N 11000 09/14/1993 Cash Common Stock 02/25/2013 Estate Estate N 24096 02/25/2013 Estate Common Stock 11/16/2012 Estate Estate N 904 11/16/2012 Estate Y Mr. Dueser will gift 11,000 shares of the issuer's stock to the Dueser Foundation. The reporting person will no longer have any beneficial ownership or pecuniary interest in such shares after the transaction. The sale of 25,000 shares will be made as part of the family limited partnership's diversification plan in connection with the manager's fiduciary obligations. 12/12/2024 Michelle S. Hickox Attorney in Fact for F. Scott Dueser