X0508 4/A 2026-02-17 2026-02-19 0001710366 Core Natural Resources, Inc. CNR 0002052440 Braithwaite Robert J. Jr. 275 TECHNOLOGY DRIVE, SUITE 101 CANONSBURG PA 15317 false true false false SVP, Marketing & Sales false Common stock, par value $0.01 per share 16306 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 and mistakenly indicated an incorrect amount of unvested restricted stock units owned. The corrected amount of securities beneficially owned by the reporting person is 16,306, of which 8,185 shares represent unvested restricted stock units. /s/ Rosemary L. Klein, Attorney-in-Fact for Robert J. Braithwaite, Jr. 2026-02-23