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. director Perera Valli filed an amended insider report to correct a prior clerical error in reported share ownership. The filing states that due to immaterial rounding errors, a previous Form 4 showed an incorrect total. The corrected amount of common stock directly beneficially owned is now reported as 9,329 shares, with no new buy or sell transaction indicated.
Core Natural Resources director Patrick A. Kriegshauser filed an amended Form 4 to correct his reported common stock holdings. A prior Form 4 contained immaterial clerical rounding errors in the total directly owned shares. The corrected amount of securities beneficially owned by him is 24,970 shares.
Core Natural Resources, Inc. executive Schuller George John Jr., SVP and Chief Operating Officer, filed an amended Form 4 to correct previously reported share ownership. A prior filing contained immaterial clerical rounding errors in the total amount of securities directly beneficially owned and in the amount of unvested restricted stock units.
The corrected figure shows he beneficially owns 27,344 shares of common stock, of which 16,280 shares are unvested restricted stock units. This amendment updates ownership information rather than reporting a new purchase or sale.
Core Natural Resources, Inc. Chief Accounting Officer John Rothka filed an amended Form 4 to correct earlier clerical errors in his reported equity holdings. The amendment confirms that on February 18, 2026, 79 shares of common stock were withheld to satisfy his tax liability.
The filing also updates his directly beneficially owned position to 9,990 shares of common stock, of which 1,314 shares are unvested restricted stock units. The company describes the prior discrepancies as immaterial clerical rounding errors.
Core Natural Resources, Inc. senior vice president of marketing and sales Robert J. Braithwaite Jr. filed an amended insider report to correct his previously reported holdings. The filing states that he directly beneficially owns 16,306 shares of common stock, of which 8,185 shares are unvested restricted stock units. The amendment reflects corrections to earlier clerical rounding errors rather than a new purchase or sale of shares.
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.