Exhibit 99.1 KIRBY CORPORATION Contact: Kurt Niemietz 713-435-1077 FOR IMMEDIATE RELEASE KIRBY CORPORATION ANNOUNCES 2024 FOURTH QUARTER AND FULL YEAR RESULTS ¹ Non-GAAP measure. See reconciliation in section titled "One-time Items" Houston, Texas (January 30, 2025) – Kirby Corporation ("Kirby") (NYSE: KEX) today announced net earnings attributable to Kirby for the fourth quarter ended December 31, 2024 of $42.8 million or $0.74 per share, compared with a net earnings of $61.9 million or $1.04 per share for ...