[Form 4] FIRST FINANCIAL BANKSHARES INC Insider Trading Activity

Rhea-AI Filing Summary

FIRST FINANCIAL BANKSHARES INC executive T. Luke Longhofer reported compensation-related equity activity involving performance stock units and deferred stock units. On March 13, 2026, he acquired 3,216 deferred stock units, representing vested performance stock units whose receipt of common shares was deferred into the company’s Supplemental Executive Retirement Plan. On the same date, he also reported an acquisition and an offsetting disposition of 3,216 shares of common stock to the issuer in connection with this deferral. After these entries, he directly holds 40,970 shares of common stock and 8,061 deferred stock units, reflecting routine equity compensation and deferral choices rather than open-market trading.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Longhofer T. Luke

Role EVP - Chief Credit Officer

Type	Security	Shares	Price	Value
Grant/Award	Deferred Stock Units	3,216	$0.00	--
Grant/Award	Common Stock	3,216	$0.00	--
Disposition	Common Stock	3,216	$0.00	--

Holdings After Transaction: Deferred Stock Units — 8,061 shares (Direct); Common Stock — 44,186 shares (Direct)

Footnotes (1)

1. 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. 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.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Longhofer T. Luke

(Last) (First) (Middle)

P O BOX 701

(Street)

ABILENE TX 79604

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
FIRST FINANCIAL BANKSHARES INC [ FFIN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP - Chief Credit Officer

3. Date of Earliest Transaction (Month/Day/Year)
03/13/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/13/2026		A		3,216(1)	A	(1)	44,186	D
Common Stock	03/13/2026		D		3,216(2)	D	(2)	40,970	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Deferred Stock Units	(2)	03/13/2026		A		3,216		(2)	(2)	Common Stock	3,216	(2)	8,061	D

Explanation of Responses:

1. 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.

2. 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.

	By: Michelle S. Hickox Attorney in Fact for T. Luke Longhofer	03/17/2026
	** Signature of Reporting Person	Date
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