X0306 4 2018-01-18 0 0000090498 SIMMONS FIRST NATIONAL CORP SFNC 0001355424 Casteel Marty SIMMONS FIRST NATIONAL CORP 501 MAIN STREET PINE BLUFF AR 71601 0 1 0 0 SEVP SFNC 2018-01-18 4 A 0 2477 58.25 A 48689 D SFNC 2018-01-18 4 F 0 1099 58.25 D 47590 D SFNC 4128 D SFNC 2288 D SFNC 11217 D Restricted Stock Unit 2018-01-18 4 A 0 2522 0 A Common 2522 2522 D Performance Stock Unit 2018-01-18 4 A 0 5044 0 A Common 5044 5044 D Each Restricted Stock Unit represents a contingent right to receive one share of Simmons First National Corporation common stock. 832 Restricted Stock Units vest on January 18, 2019; 832 Restricted Stock Units vest on January 18, 2020 and 858 Restricted Stock Units vest on January 18, 2021. 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. Each Performance Stock Unit represents a contingent right to receive one share of Simmons First National Corporation common stock. The shares listed are the maximum number of shares which may vest under this grant. Vesting will occur subsequent to the attainment of performance goals set and verified by the Compensation Committee of the Company's Board of Directors for the performance period ending December 31, 2020, contingent upon the reporting person's continued employment with the registrant. /s/ Marty Casteel by Danielle Hasty 2018-01-22