X0508 4 2025-07-01 0000090498 SIMMONS FIRST NATIONAL CORP SFNC 0001465568 HUNT EUGENE C/O SIMMONS FIRST NATIONAL CORP. 501 MAIN STREET PINE BLUFF AR 71601 true false false false false SFNC Common Stock 2025-07-01 4 M false 929 A 33288 D Restricted Stock Units 2025-07-01 4 M false 929 0 D SFNC Common Stock 929 1857 D Restricted Stock Units convert into shares of SFNC common stock on a one-for-one basis. The Restricted Stock Units vested on July 1, 2025. 929 Restricted Stock Units vest on October 1, 2025; and 928 Restricted Stock Units vest on January 2, 2026. SFNC shares will be delivered 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/ Ambar Quintanilla, attorney-in-fact for Eugene Hunt 2025-07-03