FFIN

This indirect ownership represents shares owned by a limited liability corporation of which the reporting person and his spouse are equal beneficial owners of the common stock owned by the limited liability corporation.

This amount represents a restricted stock grant that vests in a single installment on April 27, 2027.

This amount represents a restricted stock grant that vests in a single installment on April 27, 2027.

This amount represents a restricted stock grant that vests in a single installment on April 27, 2027.

This amount represents a restricted stock grant that vests in a single installment on April 27, 2027.

This amount represents a restricted stock grant that vests in a single installment on April 27, 2027.

This amount represents a restricted stock grant that vests in a single installment on April 27, 2027.

This indirect ownership represents shares owned by a limited partnership of which the reporting person and his spouse are beneficial owners of the common stock owned by the limited partnership.

This amount represents a restricted stock grant that vests in a single installment on April 27, 2027.

This amount represents a restricted stock grant that vests in a single installment on April 27, 2027.

This amount represents a restricted stock grant that vests in a single installment on April 27, 2027.

This amount represents a restricted stock grant that vests in a single installment on April 27, 2027.

This amount represents a restricted stock grant that vests in a single installment on April 27, 2027.

This amount represents a restricted stock grant that vests in a single installment on April 27, 2027.

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.

In connection with the vesting of performance stock units previously granted on August 16, 2023, Mr. Butler's receipt of 6,094 shares of common stock was deferred resulting in Mr. Butler's receipt instead of 6,094 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 6,094 performance 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.

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.

In connection with the vesting of performance stock units previously granted on August 16, 2023, Mr. Ruzicka's receipt of 2,370 shares of common stock was deferred resulting in Mr. Ruzicka's receipt instead of 2,370 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. Ruzicka is therefore reporting the disposition of 2,370 performance stock units in exchange for an equal number of shares of deferred stock units under the SERP, which are payable upon Mr. Ruzicka's termination of employment.

In connection with the vesting of performance stock units previously granted on August 16, 2023, Mr. Bailey's receipt of 2,878 shares of common stock was deferred resulting in Mr. Bailey's receipt instead of 2,878 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. Bailey is therefore reporting the disposition of 2,878 performance stock units in exchange for an equal number of shares of deferred stock units under the SERP, which are payable upon Mr. Bailey's termination of employment.

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 536 shares of the Registrant's common stock to pay income taxes related to vesting of previously granted performance stock units.

In connection with the vesting of performance stock units previously granted on August 16, 2023, Mr. Longhofer's receipt of 3,216 shares of common stock was deferred resulting in Mr. Longhofer's receipt instead of 3,216 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. Longhofer is therefore reporting the disposition of 3,216 performance stock units in exchange for an equal number of shares of deferred stock units under the SERP, which are payable upon Mr. Longhofer's termination of employment.

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.

In connection with the vesting of performance stock units previously granted on August 16, 2023, Mr. Roewe's receipt of 2,539 shares of common stock was deferred resulting in Mr. Roewe's receipt instead of 2,539 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. Roewe is therefore reporting the disposition of 2,539 performance stock units in exchange for an equal number of shares of deferred stock units under the SERP, which are payable upon Mr. Roewe's termination of employment.

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.

In connection with the vesting of performance stock units previously granted on August 16, 2023, Mr. Roewe's receipt of 2,539 shares of common stock was deferred resulting in Mr. Roewe's receipt instead of 2,539 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. Roewe is therefore reporting the disposition of 2,539 performance stock units in exchange for an equal number of shares of deferred stock units under the SERP, which are payable upon Mr. Roewe's termination of employment.

In connection with the vesting of performance stock units previously granted on August 16, 2023, Mrs. Hickox's receipt of 6,094 shares of common stock was deferred resulting in Mrs. Hickox's receipt instead of 6,094 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"). Mrs. Hickox is therefore reporting the disposition of 6,094 performance stock units in exchange for an equal number of shares of deferred stock units under the SERP, which are payable upon Mrs. Hickox's termination of employment.

In connection with the vesting of performance stock units previously granted on August 16, 2023, Mr. Butler's receipt of 6,094 shares of common stock was deferred resulting in Mr. Butler's receipt instead of 6,094 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 6,094 performance 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.

In connection with the vesting of performance stock units previously granted on August 16, 2023, Mr. Bailey's receipt of 2,878 shares of common stock was deferred resulting in Mr. Bailey's receipt instead of 2,878 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. Bailey is therefore reporting the disposition of 2,878 performance stock units in exchange for an equal number of shares of deferred stock units under the SERP, which are payable upon Mr. Bailey's termination of employment.

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.

In connection with the vesting of performance stock units previously granted on August 16, 2023, Mr. Ruzicka's receipt of 2,370 shares of common stock was deferred resulting in Mr. Ruzicka's receipt instead of 2,370 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. Ruzicka is therefore reporting the disposition of 2,370 performance stock units in exchange for an equal number of shares of deferred stock units under the SERP, which are payable upon Mr. Ruzicka's termination of employment.

In connection with the vesting of performance stock units previously granted on August 16, 2023, Mr. Longhofer's receipt of 3,216 shares of common stock was deferred resulting in Mr. Longhofer's receipt instead of 3,216 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. Longhofer is therefore reporting the disposition of 3,216 performance stock units in exchange for an equal number of shares of deferred stock units under the SERP, which are payable upon Mr. Longhofer's termination of employment.

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.

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.

In connection with the vesting of performance stock units previously granted on August 16, 2023, Mrs. Hickox's receipt of 6,094 shares of common stock was deferred resulting in Mrs. Hickox's receipt instead of 6,094 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"). Mrs. Hickox is therefore reporting the disposition of 6,094 performance stock units in exchange for an equal number of shares of deferred stock units under the SERP, which are payable upon Mrs. Hickox's termination of employment.