X0508 4 2023-10-27 0 0000036029 FIRST FINANCIAL BANKSHARES INC FFIN 0001243211 DUESER F SCOTT P. O. BOX 701 ABILENE TX 79604-0701 1 1 0 0 Chairman, President and CEO 0 Common Stock 2023-10-27 4 F 0 653 23.66 D 952215 I By Trust Common Stock 496004 I By Partnership Common Stock 448310 I By Partnership The reporting person elected, in accordance with the Registrant's 2015 Restricted Stock Plan, to exercise his right to have the Registrant withhold 653 shares of the Registrant's common stock to pay income taxes related to vesting of previously granted restricted stock. Represents shares held by several trusts of which Mr. Dueser is trustee, settlor and beneficiary. Represents shares that are owned by a family limited partnership of which Mr. Dueser serves as manager of the general partner and to which he disclaims beneficial ownership with respect to 372,003 shares. This report should not be deemed an admission that Mr. Dueser is the beneficial owner of these shares for purposes of Section 16 or any other purpose. Represents shares that are owned by a family limited partnership of which Mr. Dueser serves as manager of the general partner and to which he disclaims beneficial ownership with respect to 319,636 shares. This report should not be deemed an admission that Mr. Dueser is the beneficial owner of these shares for purposes of Section 16 or any other purpose. By: Michelle S. Hickox Attorney in Fact for F. Scott Dueser 2023-10-31