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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Giddiens Ronald N   2. Issuer Name and Ticker or Trading Symbol FIRST FINANCIAL BANKSHARES INC [FFIN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) P. O. BOX 701 3. Date of Earliest Transaction (Month/Day/Year) 01/03/2017 (Street) ABILENE, TX 79604-0701 4. If Amendment, Date 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 (City) (State) (Zip) 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 04/24/2018   A   1,190 (1) A $ 0 15,212 (2) D   Common Stock 01/03/2017   P   7 (2) A $ 46.1 3,147 I By Spouse Common Stock 04/03/2017   P   8 (2) (3) A $ 40.23 3,155 I By Spouse Common Stock 07/03/2017   P   8 (2) A $ 44.45 3,165 I By Spouse Common Stock 10/02/2017   P   8 (2) A $ 45.39 3,171 I By Spouse

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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 Underlying Securities (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 of Derivative Security: 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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Giddiens Ronald N P. O. BOX 701 ABILENE, TX 79604-0701	X

Signatures

By: J. Bruce Hildebrand Attorney in Fact for Ronald N. Giddiens		04/26/2018
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	This amount represents a restricted stock grant that vests in a single installment on April 23, 2019.
(2)	The increase in the number of shares owned by the reporting person is attributable to de minimis purchases through a broker-administered dividend reinvestment plan.
(3)	Shares were purchased pursuant to a broker-administered dividend reinvestment plan. A portion of the reporting person's purchase of common stock reported herein was matchable under 16(b) of the Securities Exchange Act of 1934 with the reporting person's sale of shares of First Financial Bankshares, Inc. common stock at a price of $41 per share on June 9, 2017. The reporting person has paid First Financial Bankshares, Inc. the profit realized in connection with the short-swing transaction.

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