Exhibit 99.1 KIRBY CORPORATION Contact: Kurt Niemietz 713-435-1077 FOR IMMEDIATE RELEASE KIRBY CORPORATION ANNOUNCES 2025 THIRD QUARTER RESULTS HOUSTON, October 29, 2025 – Kirby Corporation ("Kirby") (NYSE: KEX) today announced net earnings attributable to Kirby for the third quarter ended September 30, 2025, of $92.5 million or$1.65 per share, compared with earnings of $90.0 million, or$1.55 per share for the 2024 third quarter. Consolidated revenues for the 2025 third quarter were $871.2 million compare ...