{"schema_version":"secwatch.filing_event.v1","accession":"0001193125-26-356186","form_type":"8-K","ticker":"CNR","cik":"0001710366","company_name":"Core Natural Resources, Inc.","filed_at":"2026-08-19T12:04:57+00:00","discovered_at":"2026-08-19T12:10:00.248122+00:00","generated_at":"2026-08-19T12:11:08.054147+00:00","sec_items":["5.02","7.01","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.55,"calibrated_materiality_score":0.55,"confidence":"high","headline":"Core Natural Resources names Nathan Tucker CFO; Thakkar expands to operations role","bullets":["Nathan Tucker appointed SVP and CFO effective Aug 18, 2026, succeeding Mitesh Thakkar.","Thakkar remains President, now overseeing operations, marketing, logistics, and long-term strategy.","Tucker's new package: $400,000 base salary, 65% target STI, 125% LTI opportunity.","Tucker previously VP of finance since Core's Jan 2025 formation; joined CONSOL in 2010.","Succession described as long-planned; chairman Jimmy Brock praised both executives."],"urls":{"canonical":"https://secwatch.observer/filing/0001193125-26-356186","json":"https://secwatch.observer/filing/0001193125-26-356186.json","markdown":"https://secwatch.observer/filing/0001193125-26-356186.md","text":"https://secwatch.observer/filing/0001193125-26-356186.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1710366/000119312526356186/0001193125-26-356186-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1710366/000119312526356186/d113945d8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-08-19T12:11:08.054147+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"43b2228db6","claim":"Nathan Tucker was appointed as Senior Vice President and Chief Financial Officer at Core Natural Resources, Inc..","evidence_excerpt":"the Board of Directors (the “Board”) of Core Natural Resources, Inc. (the “Company”) appointed Nathan Tucker to serve as the Company’s Senior Vice President and Chief Financial Officer, effective immediately, taking over the Chief Financial Officer role from Mitesh Thakkar","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1710366/000119312526356186/0001193125-26-356186-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"Senior Vice President and Chief Financial Officer"}],"fact_type":"executive_change"},{"claim_id":"dfa0eff7e3","claim":"Mitesh Thakkar changed role as President at Core Natural Resources, Inc..","evidence_excerpt":"who will continue to serve as President of the Company and is assuming an expanded role with day-to-day responsibility for the Company’s primary operating functions, including operations, marketing, logistics, and long-term strategy.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1710366/000119312526356186/0001193125-26-356186-index.htm","confidence":0.9,"family_label":"Executive change","details":[{"label":"Action","value":"expanded"},{"label":"Role","value":"President"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}