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The Reporting Person hereby undertakes to provide upon request to the Securities Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares purchased at each price within the ranges set forth in footnote (1) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Of the 341,062 shares reported, 40,192 are unvested restricted stock units."}],"balance_after":341062,"source":{"system":"sec-edgar","filing":"0000950170-25-069201","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1382977/000095017025069201/ownership.xml","form_type":"4"}},{"id":1255273,"issuer":{"id":3899,"kind":"organization","name":"Core Natural Resources, Inc."},"owners":[{"id":79905,"kind":"person","name":"Lang Paul A","position":1,"cik":"0001382977","reported_name":"Lang Paul A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common stock, par value $0.01 per share","published_at":"2025-02-20T18:14:12.000Z","date":"2025-02-18","kind":"grant","planned":false,"acquired":true,"shares":20096,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents a grant of restricted stock units pursuant to the Issuer's Omnibus Performance Incentive Plan, which vest annually in equal installments over a period of three years, beginning on the first anniversary of the grant date. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Of the 333,562 shares reported, 40,192 are unvested restricted stock units."}],"balance_after":333562,"source":{"system":"sec-edgar","filing":"0000950170-25-024406","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1382977/000095017025024406/ownership.xml","form_type":"4"}},{"id":1255272,"issuer":{"id":3899,"kind":"organization","name":"Core Natural Resources, Inc."},"owners":[{"id":79905,"kind":"person","name":"Lang Paul A","position":1,"cik":"0001382977","reported_name":"Lang Paul A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common stock, par value $0.01 per share","published_at":"2025-02-20T18:14:12.000Z","date":"2025-02-18","kind":"grant","planned":false,"acquired":true,"shares":20096,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents a grant of restricted stock units pursuant to the Issuer's Omnibus Performance Incentive Plan, which vest annually in equal installments over a period of two years, beginning on the first anniversary of the grant date. 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