Century Aluminum Co SEC filings CENX
Century Aluminum Co has 1,002 filings in SEC EDGAR's recent list, going back to Mar 3, 2010. Its latest annual report, Form 10-K, was filed on Mar 3, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 5, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 5, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 10-Q | Quarterly report | Nov 5, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2026 | Nov 5, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 5, 2026 | — |
| SD | Specialized disclosure (conflict minerals) | Sep 23, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 7, 2026 | — |
| 10-Q | Quarterly report | Aug 6, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2026 | Aug 6, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 27, 2026 | — |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Jun 17, 2026 | Jun 15, 2026 |
| 144 | Notice of proposed sale | Jun 9, 2026 | — |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 7, 2026 | May 7, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 24, 2026 | — |
| DEFA14A | Additional proxy material | Apr 24, 2026 | — |
| DEF 14A | Proxy statement | Apr 24, 2026 | Jun 15, 2026 |
| 4 | Insider transaction | Mar 27, 2026 | Mar 25, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 26, 2026 | — |
| 144 | Notice of proposed sale | Mar 25, 2026 | — |
| 4 | Insider transaction | Mar 17, 2026 | Mar 16, 2026 |
| 4 | Insider transaction | Mar 13, 2026 | Mar 12, 2026 |
| 4 | Insider transaction | Mar 13, 2026 | Mar 11, 2026 |
| UPLOAD | Letter from the SEC | Mar 12, 2026 | — |
| 144 | Notice of proposed sale | Mar 12, 2026 | — |
| 4 | Insider transaction | Mar 6, 2026 | Mar 4, 2026 |
| 4 | Insider transaction | Mar 4, 2026 | Mar 2, 2026 |
| 4 | Insider transaction | Mar 4, 2026 | Mar 4, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Mar 4, 2026 | — |
| 144 | Notice of proposed sale | Mar 4, 2026 | — |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| IRANNOTICE | Filing | Mar 3, 2026 | — |
| 10-K | Annual report | Mar 3, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Restatement
|
Mar 3, 2026 | Mar 2, 2026 |
| NT 10-K | Filing | Mar 3, 2026 | Mar 3, 2026 |
| CORRESP | Letter to the SEC | Mar 2, 2026 | — |
| 144 | Notice of proposed sale | Mar 2, 2026 | — |
| UPLOAD | Letter from the SEC | Mar 2, 2026 | — |
| 4 | Insider transaction | Feb 27, 2026 | Feb 25, 2026 |
| 144 | Notice of proposed sale | Feb 27, 2026 | — |
| 4 | Insider transaction | Feb 25, 2026 | Feb 23, 2026 |
| 144 | Notice of proposed sale | Feb 25, 2026 | — |
| 144 | Notice of proposed sale | Feb 25, 2026 | — |
| 144 | Notice of proposed sale | Feb 23, 2026 | — |
| 8-K |
Current report
Results of operations
|
Feb 19, 2026 | Feb 19, 2026 |
| CORRESP | Letter to the SEC | Feb 17, 2026 | — |
| 4 | Insider transaction | Feb 11, 2026 | Feb 9, 2026 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Regulation FD disclosure
|
Feb 2, 2026 | Feb 2, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 30, 2026 | — |
| 4 | Insider transaction | Jan 23, 2026 | Jan 12, 2026 |
| 144 | Notice of proposed sale | Jan 23, 2026 | — |
| UPLOAD | Letter from the SEC | Jan 14, 2026 | — |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 8-K/A |
Amended current report
Results of operations
|
Nov 21, 2025 | Nov 6, 2025 |
| 4 | Insider transaction | Nov 13, 2025 | Nov 10, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Nov 12, 2025 | — |
| 144 | Notice of proposed sale | Nov 12, 2025 | — |
| 10-Q | Quarterly report | Nov 6, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Acquisition or sale of assets
|
Nov 6, 2025 | Nov 6, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Oct 22, 2025 | Oct 21, 2025 |
| 4 | Insider transaction | Oct 2, 2025 | Sep 30, 2025 |
| 4 | Insider transaction | Sep 30, 2025 | Sep 26, 2025 |
| SD | Specialized disclosure (conflict minerals) | Sep 25, 2025 | — |
| 144 | Notice of proposed sale | Sep 25, 2025 | — |
| 4 | Insider transaction | Sep 23, 2025 | Sep 19, 2025 |
| 144 | Notice of proposed sale | Sep 15, 2025 | — |
| 4 | Insider transaction | Aug 14, 2025 | Aug 12, 2025 |
| 144 | Notice of proposed sale | Aug 12, 2025 | — |
| IRANNOTICE | Filing | Aug 7, 2025 | — |
| 10-Q | Quarterly report | Aug 7, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2025 | Aug 7, 2025 |
| CORRESP | Letter to the SEC | Aug 6, 2025 | — |
| 8-K |
Current report
Material agreement, Agreement ended, New debt, Regulation FD disclosure
|
Jul 24, 2025 | Jul 22, 2025 |
| UPLOAD | Letter from the SEC | Jul 23, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 17, 2025 | Jul 16, 2025 |
| 4 | Insider transaction | Jul 2, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Jun 20, 2025 | Jun 16, 2025 |
| 4 | Insider transaction | Jun 18, 2025 | Jun 16, 2025 |
| 4 | Insider transaction | Jun 18, 2025 | Jun 16, 2025 |
| 4 | Insider transaction | Jun 18, 2025 | Jun 16, 2025 |
| 4 | Insider transaction | Jun 18, 2025 | Jun 16, 2025 |
| 4 | Insider transaction | Jun 18, 2025 | Jun 16, 2025 |
| S-8 | Employee stock plan registration | Jun 16, 2025 | — |
| DEFA14A | Additional proxy material | Jun 9, 2025 | — |
| CORRESP | Letter to the SEC | Jun 3, 2025 | — |
| UPLOAD | Letter from the SEC | May 19, 2025 | — |
| IRANNOTICE | Filing | May 8, 2025 | — |
| 10-Q | Quarterly report | May 8, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 7, 2025 | May 7, 2025 |
| CORRESP | Letter to the SEC | Apr 25, 2025 | — |
| DEFA14A | Additional proxy material | Apr 25, 2025 | — |
| DEF 14A | Proxy statement | Apr 25, 2025 | Jun 16, 2025 |
| CORRESP | Letter to the SEC | Apr 17, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 17, 2025 | — |
| 4 | Insider transaction | Apr 1, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Mar 25, 2025 | Mar 21, 2025 |
| 4 | Insider transaction | Mar 24, 2025 | Mar 20, 2025 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Mar 21, 2025 | Mar 21, 2025 |
| CORRESP | Letter to the SEC | Mar 20, 2025 | — |
| 4 | Insider transaction | Mar 18, 2025 | Mar 14, 2025 |
| 144 | Notice of proposed sale | Mar 17, 2025 | — |
| UPLOAD | Letter from the SEC | Mar 14, 2025 | — |
| IRANNOTICE | Filing | Mar 4, 2025 | — |
| 10-K | Annual report | Mar 3, 2025 | Dec 31, 2024 |
| CORRESP | Letter to the SEC | Feb 24, 2025 | — |
| 8-K |
Current report
Results of operations
|
Feb 20, 2025 | Feb 20, 2025 |
| 4 | Insider transaction | Feb 10, 2025 | Feb 7, 2025 |
| UPLOAD | Letter from the SEC | Feb 10, 2025 | — |
| 4 | Insider transaction | Jan 29, 2025 | Jan 28, 2025 |
| CORRESP | Letter to the SEC | Jan 17, 2025 | — |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Jan 3, 2025 | Jan 1, 2025 |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Dec 30, 2024 | Dec 26, 2024 |
| 3 | Initial insider ownership | Dec 26, 2024 | Dec 10, 2024 |
| 144 | Notice of proposed sale | Dec 26, 2024 | — |
| CORRESP | Letter to the SEC | Dec 23, 2024 | — |
| UPLOAD | Letter from the SEC | Dec 18, 2024 | — |
| 8-K |
Current report
Officer or director change
|
Dec 11, 2024 | Dec 5, 2024 |
| 4 | Insider transaction | Dec 9, 2024 | Dec 5, 2024 |
| 144 | Notice of proposed sale | Dec 5, 2024 | — |
| IRANNOTICE | Filing | Nov 4, 2024 | — |
| 10-Q | Quarterly report | Nov 4, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations, Officer or director change
|
Nov 4, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Oct 2, 2024 | Sep 30, 2024 |
| SD | Specialized disclosure (conflict minerals) | Sep 27, 2024 | — |
| 3 | Initial insider ownership | Sep 3, 2024 | Sep 1, 2024 |
| SC 13D/A | Amended ownership over 5% (active) | Aug 12, 2024 | — |
| 10-Q | Quarterly report | Aug 8, 2024 | Jun 30, 2024 |
| IRANNOTICE | Filing | Aug 8, 2024 | — |
| 8-K |
Current report
Results of operations
|
Aug 8, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Jul 15, 2024 | Jul 11, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 10, 2024 | — |
| 4 | Insider transaction | Jul 3, 2024 | Jul 1, 2024 |
| 4 | Insider transaction | Jul 2, 2024 | Jun 30, 2024 |
| 4 | Insider transaction | Jun 28, 2024 | Jun 26, 2024 |
| 144 | Notice of proposed sale | Jun 26, 2024 | — |
| 8-K |
Current report
Shareholder vote results
|
Jun 7, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | Jun 5, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | Jun 5, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | Jun 5, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | Jun 5, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | Jun 5, 2024 | Jun 3, 2024 |
| DEFA14A | Additional proxy material | May 28, 2024 | — |
| IRANNOTICE | Filing | May 1, 2024 | — |
| 10-Q | Quarterly report | May 1, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 1, 2024 | May 1, 2024 |
| DEFA14A | Additional proxy material | Apr 18, 2024 | — |
| DEF 14A | Proxy statement | Apr 18, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 25, 2024 | Mar 25, 2024 |
| IRANNOTICE | Filing | Mar 15, 2024 | — |
| 10-K | Annual report | Mar 15, 2024 | Dec 31, 2023 |
| 3 | Initial insider ownership | Mar 13, 2024 | Mar 12, 2024 |
| 4 | Insider transaction | Mar 6, 2024 | Mar 4, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 21, 2024 | Feb 21, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2024 | — |
| 4 | Insider transaction | Feb 13, 2024 | Feb 9, 2024 |
| 4 | Insider transaction | Jan 25, 2024 | Jan 19, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 25, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 24, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | Jan 5, 2024 | — |
| 4 | Insider transaction | Jan 3, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 3, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 3, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 3, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 3, 2024 | Jan 1, 2024 |
| 4 | Insider transaction | Jan 3, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 3, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Jan 2, 2024 | Dec 28, 2023 |
| 4 | Insider transaction | Dec 28, 2023 | Dec 26, 2023 |
| 144 | Notice of proposed sale | Dec 26, 2023 | — |
| 4 | Insider transaction | Dec 22, 2023 | Dec 20, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Dec 19, 2023 | Dec 19, 2023 |
| IRANNOTICE | Filing | Nov 8, 2023 | — |
| 10-Q | Quarterly report | Nov 8, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2023 | Nov 8, 2023 |
| 4 | Insider transaction | Oct 2, 2023 | Sep 30, 2023 |
| IRANNOTICE | Filing | Aug 9, 2023 | — |
| 10-Q | Quarterly report | Aug 9, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 9, 2023 | Aug 9, 2023 |
| 4 | Insider transaction | Jul 5, 2023 | Jun 30, 2023 |
| 4 | Insider transaction | Jul 3, 2023 | Jul 1, 2023 |
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Company profile
- Industry
- Primary Production of Aluminum (SIC 3334)
- Listed as
- CENX (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Chicago, IL
- SEC filer status
- Large accelerated filer
- SEC CIK
- 949157
Other Primary Production of Aluminum companies
- Alcoa Corp AA
- Aluminum Corp Of China Ltd ALMMF
Source: SEC EDGAR filings. This is company-reported data, not investment advice.