Welcome to our dedicated page for Core Natural SEC filings (Ticker: CNR), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
Core Natural Resources' SEC filings reveal how this metallurgical coal producer performs across mining operations, production volumes, and market conditions. Unlike diversified energy companies, coal miners like CNR report operational metrics specific to underground mining including tons produced, revenue per ton, and mine-level profitability.
10-K annual reports detail Core Natural Resources' reserve estimates, mining infrastructure, and long-term operational outlook. These filings explain the company's Appalachian Basin assets, including the Leer South longwall operation, and provide context on coal quality, customer relationships, and competitive positioning in metallurgical coal markets. Our AI summaries highlight key production figures and segment breakdowns without requiring you to parse hundreds of pages of technical mining disclosures.
10-Q quarterly filings track Core Natural Resources' production and financial results throughout the year. Metallurgical coal producers experience pricing volatility tied to global steel demand, making quarterly trends particularly informative. Review revenue, cost per ton, and operational updates to understand how mine conditions and market pricing affect results.
Form 4 insider transactions show when Core Natural Resources executives and directors buy or sell company shares. Insider activity at mining companies can signal management's confidence in production outlook and coal market conditions. Track executive stock transactions alongside operational news for additional investment context.
8-K material events capture significant announcements including mine incidents, leadership changes, financing activities, and major contracts. Coal mining operations can experience production disruptions, making timely 8-K disclosures important for understanding operational developments. Access these filings with AI-powered explanations that clarify technical mining and financial terminology.
Core Natural Resources, Inc. (CNR) filed a Form 144 notice showing a proposed sale of 1,000 common shares, with an aggregate market value of $92,700, planned for 10/08/2025 on the NYSE. The shares were acquired on 12/12/2019 as Restricted Stock Units & Performance Stock Units from the issuer. The filing lists 51,471,519 shares outstanding, which provides context for the size of the planned sale relative to total shares.
The notice also discloses a sale of 2,500 common shares executed under a 10b5-1 plan on 10/03/2025 for gross proceeds of $225,000. The filer certifies they are not aware of undisclosed material adverse information and includes the standard representations required when relying on a 10b5-1 plan.
Insider sale under prearranged plan at Core Natural Resources (CNR)
Chief Accounting Officer John Rothka reported an automatic sale of 2,500 shares of Core Natural Resources common stock on
Core Natural Resources, Inc. filed a Form 144 notifying the proposed sale of 2,500 shares of common stock through Morgan Stanley Smith Barney LLC on or about 10/03/2025. The filing lists an aggregate market value of $214,500.00 and indicates 51,471,519 shares outstanding for the issuer. The shares were acquired on 12/12/2019 as Restricted and Performance Stock Units, and no sales by the holder in the past three months are reported. The filer attests they are not aware of undisclosed material adverse information and the sale is being notified under Rule 144.
Richard A. Navarre, a director of Core Natural Resources, Inc. (CNR), reported a sale of common stock on 09/25/2025. The filing shows 5,000 shares were sold at $82.20 per share to cover tax liabilities arising from the vesting of previously granted restricted stock awards tied to the August 20, 2024 merger agreement. After the sale, the reporting person beneficially owned 21,830 shares, of which 4,576 shares remain unvested restricted stock units. The Form 4 was signed by an attorney-in-fact on 09/26/2025.
Core Natural Resources, Inc. (CNR) reported a Rule 144 notice for the proposed sale of 5,000 common shares by a person whose shares vested under a registered plan on 01/13/2025. The shares are held at Morgan Stanley Smith Barney LLC and the seller plans an approximate sale date of 09/25/2025 on the NYSE. The filing discloses an aggregate market value of $410,975.50 for the shares and states payment for the vested shares was for services rendered. No other sales in the prior three months were reported.
Core Natural Resources director Patrick A. Kriegshauser reported a transaction on 09/17/2025 showing the sale of 3,043 shares of the company's common stock at $77.07 per share. The sale was executed to cover the reporting person's tax liability arising from the vesting of previously granted restricted stock awards tied to the Agreement and Plan of Merger dated August 20, 2024. After the sale, the filing shows the reporting person beneficially owns 23,348 shares, of which 3,348 remain unvested restricted stock units. The Form 4 was signed on 09/18/2025 by an attorney-in-fact.
Core Natural Resources, Inc. (CNR) insider submitted a Form 144 notifying a proposed sale of 3,043 common shares through Morgan Stanley Smith Barney, with an aggregate market value of $234,524.01. The shares represent approximately 0.0059% of the 51,471,519 shares outstanding and are scheduled for sale on 09/17/2025 on the NYSE.
The shares were acquired via restricted stock vesting: 1,651 shares on 01/13/2025 and 1,392 shares on 02/09/2024. The filer reports no other sales in the past three months and certifies no undisclosed material adverse information.
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