Exhibit 99.1 CANONSBURG, Pa., Feb. 12, 2026 /PRNewswire/ -- Today, Core Natural Resources, Inc. (NYSE: CNR) ("Core" or the "company") reported a net loss of $79.0 million, or ($1.54) per diluted share, in the fourth quarter of 2025. Additionally, Core reported adjusted EBITDA of $103.1 million in the quarter, which included fire extinguishment costs at Leer South and idle mine cash costs at Leer South and West Elk totaling$36.4 million, as well as a portion of the total insurance proceeds related to the Ba ...