X0508 4 2026-01-30 0000056047 KIRBY CORP KEX 0001483620 Grzebinski David W 55 WAUGH DRIVE SUITE 1000 HOUSTON TX 77007 true true false false CEO false Restricted Stock Units 2026-01-30 4 A false 20185 0 A Common Stock 20185 20185 D Each restricted stock unit represents a contingent right to receive cash or one share of common stock of the issuer. These restricted stock units granted on January 30, 2026, vest in five equal annual installments beginning on February 3, 2027. Cash or shares of common stock of the issuer, at the election of the issuer, will be delivered to the reporting person on or as soon as practicable on each vesting date. Ronald A. Dragg, Agent and Attorney-in-Fact 2026-02-03