X0508 4/A 2026-02-17 2026-02-19 0001710366 Core Natural Resources, Inc. CNR 0001970886 Perera Valli 275 TECHNOLOGY DRIVE, SUITE 101 CANONSBURG PA 15317 true false false false false Common stock, par value $0.01 per share 9329 D On February 19, 2026, due to immaterial clerical rounding errors, the reporting person filed a Form 4 which inadvertently reported an incorrect total amount of securities directly beneficially owned by the reporting person. The corrected amount of securities beneficially owned by the reporting person is 9,329. /s/ Rosemary L. Klein, Attorney-in-Fact for Valli Perera 2026-02-24