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Century Aluminum Co. SEC filings

Century Aluminum (CENX) 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. 17 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 Century Aluminum Co. filed 17 documents with the SEC of the kinds listed here: 9 current reports (8-K), about 4 results of operations; 2 acquisition or disposition completed; 2 regulation FD disclosure; 1 shareholder vote; 1 financial statements not to be relied on; 3 quarterly reports (10-Q), 1 conflict minerals report (SD), 1 additional proxy material (DEFA14A), 1 proxy statement (DEF 14A), 1 annual report (10-K), 1 late annual report notice (NT 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
6 August 202610-Qquarterly report30 June 2026EDGAR
6 August 20268-KResults of operations6 August 2026EDGAR
17 June 20268-KShareholder vote15 June 2026EDGAR
7 May 202610-Qquarterly report31 March 2026EDGAR
7 May 20268-KResults of operations7 May 2026EDGAR
24 April 2026DEFA14Aadditional proxy materialEDGAR
24 April 2026DEF 14Aproxy statement15 June 2026EDGAR
3 March 202610-Kannual report31 December 2025EDGAR
3 March 20268-KFinancial statements not to be relied on2 March 2026EDGAR
3 March 2026NT 10-Klate annual report notice3 March 2026EDGAR
19 February 20268-KResults of operations19 February 2026EDGAR
2 February 20268-KMaterial agreement, Acquisition or disposition completed, Regulation FD disclosure2 February 2026EDGAR
21 November 20258-K/AResults of operations6 November 2025EDGAR
6 November 202510-Qquarterly report30 September 2025EDGAR
6 November 20258-KAcquisition or disposition completed6 November 2025EDGAR
22 October 20258-KRegulation FD disclosure21 October 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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