X0306 4 2018-10-23 0 0000036029 FIRST FINANCIAL BANKSHARES INC FFIN 0001554713 Butler Ronald David II P. O. BOX 701 ABILENE TX 79510 0 1 0 0 CAO Common Stock 2018-10-23 4 A 0 1355 0.00 A 51162 D Common Stock 2018-10-23 4 F 0 486 55.34 D 50676 D On October 23,2018, First Financial Bankshares, Inc. granted the reporting person restricted stock totaling 1,355 shares. The restricted stock vests 33 1/3% at the end of one year, 66 2/3% at the end of two years, and 100% at the end of three years. The reporting person elected, in accordance with the Registrant's 2015 Restricted Stock Plan, to exercise his right to have the Registrant withhold 486 shares of the Registrant's common stock to pay income taxes related to vesting of previously granted restricted stock. By: J. Bruce Hildebrand Attorney in Fact for Ronald David Butler II 2018-10-24