OTHER EVENTS On July 28, 2026, the Board of Directors (the "Board") of First Financial Bankshares, Inc., a Texas corporation (the "Corporation"), renewed and increased the size of its share repurchase plan to repurchase common shares of the Corporation. Under the renewed plan, the Corporation extended the expiration date of the plan from July 31, 2026 to July 31, 2027 with authorization to acquire up to 7.2 million shares, an increase from the previously authorized up to 5.0 million shares. S…

RESULTS OF OPERATIONS AND FINANCIAL CONDITION Attached as an exhibit to this Form 8-K is the earnings release for the quarter ended June 30, 2026 of First Financial Bankshares, Inc.

RESULTS OF OPERATIONS AND FINANCIAL CONDITION Attached as an exhibit to this Form 8-K is the earnings release for the quarter ended March 31, 2026 of First Financial Bankshares, Inc.

CEO — F. Scott Dueser: David Bailey was promoted to President and CEO, succeeding F. Scott Dueser who is transitioning to Executive Chairman.

RESULTS OF OPERATIONS AND FINANCIAL CONDITION Attached as an exhibit to this Form 8-K is the earnings release for the quarter ended December 31, 2025 of First Financial Bankshares, Inc.

RESULTS OF OPERATIONS AND FINANCIAL CONDITION Attached as an exhibit to this Form 8-K is the earnings release for the quarter ended September 30, 2025 of First Financial Bankshares, Inc.

RESULTS OF OPERATIONS AND FINANCIAL CONDITION Attached as an exhibit to this Form 8-K is the earnings release for the quarter ended June 30, 2025 of First Financial Bankshares, Inc. The information contained in this Form 8-K, including Exhibit 99.1, is furnished to the Securities and Exchange Commission (the "Commission"), but shall not be deemed "filed" with the Commission for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or incorporated by r…

OTHER EVENTS On July 22, 2025, the Board of Directors (the "Board") of First Financial Bankshares, Inc., a Texas corporation (the "Corporation"), renewed its stock repurchase plan to repurchase common shares of the Corporation. Under the renewed plan, the Corporation extended the expiration date of the plan from July 31, 2025 to July 31, 2026 with authorization to acquire up to 5 million shares. Stock repurchases under the plan may be made from time to time on the open market, in privately ne…

RESULTS OF OPERATIONS AND FINANCIAL CONDITION Attached as an exhibit to this Form 8-K is the earnings release for the quarter ended June 30, 2025 of First Financial Bankshares, Inc.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth in

Entry into a Material Definitive Agreement. On June 30, 2025, First Financial Bankshares, Inc. (the “Company”) renewed its revolving line of credit with Frost Bank pursuant to that certain First Amendment to its Amended and Restated Loan Agreement, dated June 30, 2023 (as amended, the “Loan Agreement”) and Renewal Promissory Note (the "Note"). Under the Note as governed by the Loan Agreement, the Company is permitted to draw up to $50.0 million on a revolving line of credit. Prior to June 30,…

RESULTS OF OPERATIONS AND FINANCIAL CONDITION Attached as an exhibit to this Form 8-K is the earnings release for the quarter ended March 31, 2025 of First Financial Bankshares, Inc.

RESULTS OF OPERATIONS AND FINANCIAL CONDITION Attached as an exhibit to this Form 8-K is the earnings release for the quarter ended December 31, 2024 of First Financial Bankshares, Inc.

President — David Bailey: David Bailey was promoted from Executive Vice President to President, an internal succession that does not constitute a departure of a senior executive.

RESULTS OF OPERATIONS AND FINANCIAL CONDITION Attached as an exhibit to this Form 8-K is the earnings release for the quarter ended September 30, 2024 of First Financial Bankshares, Inc.

OTHER EVENTS On July 23, 2024, the Board of Directors (the "Board") of First Financial Bankshares, Inc., a Texas corporation (the "Corporation"), renewed its stock repurchase plan to repurchase common shares of the Corporation. Under the renewed plan, the Corporation extended the expiration date of the plan from July 31, 2024 to July 31, 2025 with authorization to acquire up to 5 million shares. Stock repurchases under the plan may be made from time to time on the open market, in privately ne…

RESULTS OF OPERATIONS AND FINANCIAL CONDITION Attached as an exhibit to this Form 8-K is the earnings release for the quarter ended June 30, 2024 of First Financial Bankshares, Inc.

Director — Sally Pope Davis: The filing discloses the appointment of a new independent director to the board, which is a standard governance event and not a departure of an executive officer.

RESULTS OF OPERATIONS AND FINANCIAL CONDITION Attached as an exhibit to this Form 8-K is the earnings release for the quarter ended March 31, 2024 of First Financial Bankshares, Inc.