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, Inc. (NYSE: CNR) files a range of documents with the U.S. Securities and Exchange Commission that describe its coal operations, financial performance, risks, and corporate actions. As a registrant with common stock listed on the New York Stock Exchange, the company submits annual reports on Form 10-K, quarterly reports on Form 10-Q, and current reports on Form 8-K, along with exhibits and investor presentations.
In its 8-K filings, Core Natural Resources has reported quarterly results, leadership changes, financing arrangements, operational updates, and mine safety events. Examples include 8-Ks announcing second and third quarter 2025 financial results, an 8-K describing the appointment of a new chief executive officer and the related separation arrangements for the prior CEO, and an 8-K detailing a refinancing of tax-exempt bonds originally issued by its predecessor companies. Another 8-K outlines a receivables financing agreement and related sale and contribution agreements involving trade receivables.
Filings also address mine operations and safety. One 8-K reports an imminent danger order issued under section 107(a) of the Federal Mine Safety and Health Act at the Mountaineer II mine in West Virginia due to elevated methane levels in an isolated section, noting that mine personnel took actions to restore acceptable levels and that the order was terminated without injuries or illnesses. Other 8-Ks furnish press releases on efforts to resume longwall operations at the Leer South mine and the eventual resumption of those operations.
On this SEC filings page, users can review Core Natural Resources’ Forms 10-K and 10-Q for detailed financial statements, segment information for metallurgical, high calorific value thermal, and Powder River Basin coal operations, and risk factor discussions. They can also access 8-Ks covering earnings releases, financing transactions, governance changes, and mine safety disclosures. AI-powered summaries can help explain lengthy filings, highlight key figures and segment trends, and point out items such as capital return framework details, debt structure changes, and significant operational events described in the underlying documents.
Core Natural Resources, Inc. filed an amended Form 4 for executive Rosemary L. Klein to correct previously misstated holdings caused by immaterial clerical rounding errors. The corrected beneficial ownership is 68,679 shares, of which 11,045 are unvested restricted stock units.
This amendment does not reflect new stock purchases or sales; it replaces inaccurate share and RSU amounts reported in an earlier Form 4 filed on February 19, 2026.
Core Natural Resources, Inc. filed an amended insider report updating President & CFO Miteshkumar Thakkar’s direct holdings after earlier clerical rounding errors. As corrected, he beneficially owns 61,661 shares of common stock, of which 18,624 shares are unvested restricted stock units.
Core Natural Resources, Inc. filed an amended insider report to correct previously misreported share holdings for executive Kurt R. Salvatori. Due to earlier clerical rounding errors, the updated filing now shows he directly beneficially owns 24,599 common shares, including 10,455 unvested restricted stock units.
Core Natural Resources, Inc. executive Slone Deck filed an amended insider report to correct previously misstated share holdings. A prior Form 4 contained immaterial clerical rounding errors in the total directly owned shares and the amount of unvested restricted stock units.
The corrected disclosure states that Deck beneficially owns 70,219 shares of common stock, of which 10,929 shares are unvested restricted stock units. The amendment reflects a clarification of ownership amounts rather than a new buy or sell transaction.
Core Natural Resources, Inc. filed an amended Form 4 for Executive Chair and CEO Brock James A to correct earlier clerical errors. The update clarifies that 2,960 shares of common stock were withheld on February 18, 2026 to cover the executive's tax liability. The amendment also states that the corrected amount of securities directly beneficially owned is 266,975 shares, of which 44,640 shares are unvested restricted stock units. These changes revise prior rounding and reporting mistakes rather than recording a new discretionary stock transaction.
Core Natural Resources, Inc. director Patrick A. Kriegshauser reported an equity award in the form of restricted stock units. On February 17, 2026, he acquired 1,610 common-share-equivalent restricted stock units at a stated price of $0.00 per share as a grant or award.
The units were granted under the company’s Omnibus Performance Incentive Plan and vest on the first anniversary of the grant date, with each unit representing a contingent right to receive one share of common stock. After this award, Kriegshauser’s direct holdings total 24,958 shares and units, of which 1,610 are unvested restricted stock units.
Core Natural Resources, Inc. President & CFO Miteshkumar Thakkar reported equity compensation and related tax-withholding transactions in common stock. On February 17, he acquired 8,730 restricted stock units at $0.00 per share under the company’s Omnibus Performance Incentive Plan, vesting in three equal annual installments starting on the first anniversary of the grant date. Each unit represents a contingent right to receive one share of common stock. On February 18, he disposed of 806 and 1,223 shares of common stock at $88.96 per share through tax-withholding dispositions to cover liabilities from previously vested restricted stock units, rather than open-market sales. Following these transactions, he directly holds 61,657 shares of common stock, including 18,620 unvested restricted stock units.
Core Natural Resources, Inc. director Richard A. Navarre received an equity award of 2,200 restricted stock units under the company’s Omnibus Performance Incentive Plan. These units vest on the first anniversary of the grant date and each converts into one share of common stock at vesting.
After this award, Navarre holds 24,030 shares of common stock in total, including 2,200 unvested restricted stock units.
Core Natural Resources, Inc. senior vice president and chief legal officer Rosemary L. Klein reported equity compensation and related tax-withholding transactions. On February 17, 2026, she acquired 5,060 restricted stock units at $0.00 per unit, vesting in three equal annual installments. On February 18, 2026, she disposed of 497 and 746 shares of common stock at $88.96 per share to cover tax liabilities from vesting RSUs. After these transactions, she directly held 68,667 shares of common stock, including 11,033 unvested restricted stock units.
Core Natural Resources, Inc. director Perera Valli received an equity award in the form of 1,610 restricted stock units of common stock. The grant was made at a price of $0.00 per share as a compensation award, not an open-market purchase.
The restricted stock units were granted under the company’s Omnibus Performance Incentive Plan and vest on the first anniversary of the grant date. After this award, Valli beneficially owns 9,317 shares of common stock, of which 1,610 are unvested restricted stock units that will convert into shares upon vesting.