X0306 4 2018-05-01 0 0000090498 SIMMONS FIRST NATIONAL CORP SFNC 0001638649 DORAMUS MARK C 9 WEST PALISADES LITTLE ROCK AR 72207 1 0 0 0 SFNC 7482 D Restricted Stock Unit 2018-05-01 4 A 0 1640 0.00 A Common 1640 1640 D Each Restricted Stock Unit represents a contingent right to receive one share of Simmons First National Corporation common stock. 25% Restricted Stock Units vest upon acceptance of the grant; 25% Restricted Stock Units vest on July 2, 2018; 25% Restricted Stock Units vest on October 1, 2018 and 25% Restricted Stock Units vest on January 2, 2019. SFNC shares will be delivered within 30 days of vesting. Events such as retirement, death, disability and other specified events in the agreement may result in earlier vesting. /s/ Mark C. Doramus by Piper P. Erwin 2018-05-03