Welcome to our dedicated page for Core Natural Resources 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. filings document the company's coal operating results, mine-safety disclosures, governance votes and Regulation FD communications. Form 8-K reports include quarterly earnings releases, investor presentations, updates on longwall operations at Leer South and West Elk, and mine-safety events reported under the Federal Mine Safety and Health Act.
Proxy and annual meeting materials cover director elections, auditor ratification, executive compensation votes, common-stock voting matters and related governance disclosures. The filings also provide formal records of capital-structure information, operating and financial results, and material events affecting the company's metallurgical and thermal coal operations.
Core Natural Resources, Inc. reported a Q4 2025 net loss of $79.0 million, or ($1.54) per diluted share, on revenues of $1.042 billion. Despite the loss, adjusted EBITDA reached $103.1 million, reflecting fire and idle-mine costs of $36.4 million partly offset by $23.9 million of insurance proceeds.
The company generated net cash from operating activities of $107.3 million and free cash flow of $27.0 million in the quarter. It returned $26.8 million to stockholders through buybacks and dividends, bringing 2025 capital returns to $245.1 million, and has $775.7 million remaining under its $1.0 billion repurchase authorization.
For 2026, Core guides to total coal sales of 85.6–91.4 million tons across metallurgical, high calorific value thermal, and Powder River Basin segments, with segment cash cost ranges indicating expected margin improvement. Liquidity was strong at $948.9 million as of December 31, 2025, including $432.2 million of cash and cash equivalents.
Core Natural Resources, Inc. reported a mine safety event at its Mountaineer II mine in Logan County, West Virginia. On January 8, 2026, subsidiary Mingo Logan Coal LLC received an imminent danger order under section 107(a) of the Federal Mine Safety and Health Act of 1977 after an inspector found elevated methane levels in an isolated section of the mine. Mine personnel took actions to correct the issue and restored acceptable methane levels. The Mine Safety and Health Administration subsequently terminated the 107(a) order, and no injuries or illnesses resulted from this temporary condition.
Core Natural Resources, Inc. has a shareholder planning to sell 60000 common shares of the company under Rule 144 through Wells Fargo Clearing Services, with an approximate sale date of 12/18/2025 on the NYSE and an aggregate market value of 5395281.29. The filing notes that 51239470 shares were outstanding.
The securities to be sold were acquired through a 264499 share restricted stock award dated 02/27/2017 from the issuer and a 7500 share open market purchase on 05/09/2025 paid in cash. The same shareholder previously sold 28870 securities of Core Natural Resources, Inc. on 11/13/2025 for gross proceeds of 2427447.15, and represents that they are not aware of undisclosed material adverse information about the issuer.
Core Natural Resources, Inc. disclosed that it has resumed longwall operations at its Leer South mine in West Virginia and provided an update on productivity levels at its West Elk mine in Colorado. This information is contained in a press release dated December 18, 2025, which is furnished as Exhibit 99.1 under Regulation FD and is not deemed filed under Section 18 of the Exchange Act or Sections 11 and 12(a)(2) of the Securities Act.
Core Natural Resources (CNR) reported insider transactions by Executive Chair and CEO James A. Brock. On November 13, 2025, 140,760 common shares were transferred at $0 from a revocable trust for the benefit of his spouse to a spousal lifetime access trust (SLAT-1). The filing also notes 24,440 shares held indirectly via the Lee Ann Brock Trust.
Separately on the same date, the reporting person contributed 117,398 common shares, previously reported as directly owned, to a grantor retained annuity trust (GRAT-1). These estate-planning transfers were reported as indirect holdings and involved no purchase or sale proceeds.
State Street Corporation filed a Schedule 13G reporting beneficial ownership in Core Natural Resources Inc common stock. As of 09/30/2025, State Street reported 3,439,517 shares beneficially owned, representing 6.7% of the class.
The filing lists shared voting power over 3,375,289 shares and shared dispositive power over 3,439,517 shares, with no sole voting or dispositive power. State Street certified the holdings were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control.
The reporting person is classified as a parent holding company (HC), with investment advisory affiliates including SSGA entities named in the ownership structure.
Core Natural Resources (CNR) reported third‑quarter results reflecting its merger with Arch Resources. Revenue was $1,002.5 million versus $553.4 million a year ago, while net income was $31.6 million compared to $95.6 million last year. Year‑to‑date, revenue reached $3,122.3 million, with a net loss of $74.2 million, versus net income of $255.6 million in 2024.
The company completed an all‑stock merger on January 14, 2025, issuing 24.3 million shares valued at $2,481.4 million, representing roughly 45% of shares outstanding post‑deal. Total assets rose to $6,195.9 million from $2,879.5 million at year‑end, driven by acquired mining assets and inventory. CNR ended the quarter with cash and cash equivalents of $444.7 million, and no borrowings on its $600 million revolver, with $521.3 million of unused capacity.
Shares outstanding were 51,239,470 as of October 31, 2025.
Core Natural Resources, Inc. furnished an update noting it issued a press release announcing its 2025 third‑quarter results and posted an investor presentation. Both materials are available as exhibits and on the company’s website.
The information is furnished, not filed, and is not subject to Section 18 liabilities. Exhibit 99.1 contains the press release, and Exhibit 99.2 contains the investor presentation.
The Vanguard Group filed an amended Schedule 13G reporting passive ownership of 5,630,287 shares of Core Natural Resources Inc common stock, representing 10.93% of the class as of 09/30/2025.
The filing shows 0 shares with sole voting power and 331,513 with shared voting power. Vanguard reports 5,241,387 shares with sole dispositive power and 388,900 with shared dispositive power. The firm states the securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control. Clients of The Vanguard Group have the right to receive dividends or sale proceeds, and no single other person’s interest exceeds 5%.
Core Natural Resources, Inc. (CNR) insider John Rothka, the company’s Chief Accounting Officer, reported two automatic sales under a Rule 10b5-1 plan. On 10/08/2025 he sold 1,000 shares at $95, and on 10/09/2025 he sold 1,000 shares at $100, reducing his direct holdings to 9,307 shares. The filing notes the trades were executed under a trading plan adopted on 03/24/2025. Of the remaining shares, 828 are unvested restricted stock units, which limits immediately tradable stock. The Form 4 was signed by an attorney-in-fact on 10/10/2025, and indicates routine, preauthorized sales rather than open-market discretionary trades.