X0508 4 2024-03-18 0 0000036029 FIRST FINANCIAL BANKSHARES INC FFIN 0001924083 Bailey David William P O BOX 701 ABILENE TX 79604 0 1 0 0 EVP, Commercial Banking 0 Common Stock 2024-03-18 4 A 0 394 0.00 A 12481 D Common Stock 2024-03-18 4 F 0 93 31.64 D 12388 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 93 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 David William Bailey 2024-03-20