X0306 4 2018-04-02 0 0000090498 SIMMONS FIRST NATIONAL CORP SFNC 0001381734 West Malynda K 264 RAINWATER ROAD EL DORADO AR 71730 1 0 0 0 SFNC 2018-04-02 4 M 0 169 27.85 A 1807 D Restricted Stock Unit 27.85 2018-04-02 4 M 0 169 27.85 D Common 169 337 D On February 8, 2018, the Company effected a 2-for-1 stock split. The number of shares/units reported in this Form 4 has been adjusted to reflect the stock split. The Restricted Stock Unit vested on April 2, 2018. 169 Restricted Stock Units vest on July 02, 2018 and 168 Restricted Stock Units vest on October 01, 2018. 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/ Malynda K. West by Piper P. Erwin 2018-04-04