X0508 4 2024-03-18 0 0000036029 FIRST FINANCIAL BANKSHARES INC FFIN 0001554713 Butler Ronald David II P. O. BOX 701 ABILENE TX 79510 0 1 0 0 CAO 0 Common Stock 2024-03-18 4 A 0 1704 0.00 A 151626 D Common Stock 2024-03-18 4 F 0 419 31.64 D 151207 D Represents shares of common stock issued upon the vesting of outstanding performance stock units that were subject to performance criteria other than the issuer's stock price. The reporting person elected, in accordance with the Registrant's 2021 Omnibus Stock and Incentive Plan, to exercise his right to have the Registrant withhold 419 shares of the Registrant's common stock to pay income taxes related to vesting of previously granted performance stock units. By: Michelle S. Hickox Attorney in Fact for Ronald D. Butler II 2024-03-20