X0306 4 2021-08-16 0 0000056047 KIRBY CORP KEX 0001483620 Grzebinski David W 55 WAUGH DRIVE SUITE 1000 HOUSTON TX 77007 1 1 0 0 President & CEO Common Stock, par value $0.10 per share 2021-08-16 4 S 0 1000 56.738 D 61236 D This sale was transacted pursuant to a planned sale under a Rule 10b5-1 trading plan. The reported price is the weighted average sales price. The sales were at prices ranging from $56.47 to $57.17 per share. The reporting person will provide, upon request by the commission staff, full information regarding the number of shares sold at each separate price. Ronald A. Dragg, Agent and Attorney-in-Fact 2021-08-16