X0508 4 2025-03-05 0000090498 SIMMONS FIRST NATIONAL CORP SFNC 0001235478 MAKRIS GEORGE JR C/O SIMMONS FIRST NATIONAL CORP. 501 MAIN STREET PINE BLUFF AR 71601 true true false false Chairman & CEO false SFNC Common Stock 634153 D SFNC Common Stock 12000 I By Trust SFNC Common Stock 9270 I By IRA SFNC Common Stock 10990 I By IRA (Spouse) Restricted Stock Units 2025-03-05 4 A false 34579 0 A SFNC Common Stock 34579 34579 D Each restricted stock unit represents a contingent right to receive one share of SFNC common stock. 11,526 Restricted Stock Units vest on March 5, 2026; 11,526 Restricted Stock Units vest on March 5, 2027; and 11,527 Restricted Stock Units vest on March 5, 2028. SFNC shares will be delivered to the reporting person within 30 days of vesting. Events such as retirement, death, disability and other specified events in the award agreement may result in earlier vesting. /s/ Natalie Gassiott, attorney-in-fact for George Makris Jr. 2025-03-07