#1 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 139 shares of the Registrant's common stock to pay income taxes related to vesting of previously granted restricted stock units.

#2 In connection with the vesting on August 16, 2024, of 1,920 restricted stock units previously granted to Mr. Butler, Mr. Butler's receipt of 1,920 shares of common stock was deferred resulting in Mr. Butler's receipt instead of 1,920 shares of deferred stock units into the First Financial Bankshares, Inc. Supplemental Executive Retirement Plan, as amended and restated effective July 26, 2022 (the "SERP"). Mr. Butler is therefore reporting the disposition of 1,920 restricted stock units in exchange for an equal number of shares of deferred stock units under the SERP, which are payable upon Mr. Butler's termination of employment.