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Core Natural Resources, Inc. SEC filings

Core Natural Resources (CNR) filed its 10-Q for the quarter ended 30 June 2026 on 6 August 2026. Its latest SEC filing, on 23 September 2026, was an SD: conflict minerals report. 19 filings in the last twelve months, each 8-K by what it was about; the 10-K and proxy statement are on the documents page.

In the twelve months since 11 October 2025 Core Natural Resources, Inc. filed 19 documents with the SEC of the kinds listed here: 11 current reports (8-K), about 8 regulation FD disclosure; 4 results of operations; 3 mine safety; 1 officer or director change; 1 shareholder vote; 3 quarterly reports (10-Q), 1 conflict minerals report (SD), 1 additional proxy material (DEFA14A), 1 proxy statement (DEF 14A), 1 amended annual report (10-K/A), 1 annual report (10-K). The latest, filed 23 September 2026: SD, conflict minerals report. The 10-K, the 10-Qs and the proxy statement themselves, each with a link to open it, are on the documents page.

FiledFormWhat it was aboutPeriod or event dateFiling
23 September 2026SDconflict minerals reportEDGAR
19 August 20268-KOfficer or director change, Regulation FD disclosure18 August 2026EDGAR
6 August 202610-Qquarterly report30 June 2026EDGAR
6 August 20268-KResults of operations, Regulation FD disclosure6 August 2026EDGAR
4 June 20268-KRegulation FD disclosure4 June 2026EDGAR
19 May 20268-KMine safety13 May 2026EDGAR
7 May 202610-Qquarterly report31 March 2026EDGAR
7 May 20268-KResults of operations, Regulation FD disclosure7 May 2026EDGAR
4 May 20268-KMine safety29 April 2026EDGAR
30 April 20268-KShareholder vote, Regulation FD disclosure30 April 2026EDGAR
16 March 2026DEFA14Aadditional proxy materialEDGAR
16 March 2026DEF 14Aproxy statement30 April 2026EDGAR
27 February 202610-K/Aamended annual report31 December 2025EDGAR
17 February 202610-Kannual report31 December 2025EDGAR
12 February 20268-KResults of operations, Regulation FD disclosure12 February 2026EDGAR
12 January 20268-KMine safety8 January 2026EDGAR
18 December 20258-KRegulation FD disclosure18 December 2025EDGAR
6 November 202510-Qquarterly report30 September 2025EDGAR
6 November 20258-KResults of operations, Regulation FD disclosure6 November 2025EDGAR
An 8-K is what a company files within four business days of a material event; the SEC numbers the events, and the words here are the SEC's own headings, shortened.
Read moreForm 4, Form 144, 13F and Schedule 13D and 13G have their own pages. Prospectus supplements and correspondence are not listed.

Source

The company's filing index on EDGAR, read from the SEC's submissions feed.

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