As of November 6, 2026, Century Aluminum Co. is a publicly traded company (Nasdaq: CENX). The largest holder reporting an active stake on Schedule 13D is Glencore International AG, at 29.99%. No bankruptcy or receivership appears in its SEC Form 8-K filings. Passive holders reporting on Schedule 13G include BlackRock (10.5%), State Street (5.6%) (Schedule 13D/A, March 4, 2026).
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Is Century Aluminum Co. a real, registered company?
- Century Aluminum Co files with the SEC under CIK 949157 (its SEC filings).
- Its shares are listed under the ticker CENX on Nasdaq (SEC company record).
- Incorporated in Delaware; business address in Chicago, Illinois, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under CENTURY ALUMINUM CO in our court records and SEC 8-K records (as of 2026-11-06).
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names BlackRock (filed 2026-10-05).
Who are Century Aluminum Co.'s owners and officers?
Century Aluminum Co.: incorporated in Delaware; business address in Chicago, Illinois; industry Primary Production of Aluminum (Schedule 13G/A, 2026-10-05).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-10-05 | Blackrock, Inc. | 10.5% |
| Schedule 13G, 2026-08-07 | State Street Corporation | 5.6% |
| Schedule 13G/A, 2026-07-27 | Blackrock, Inc. | 9.5% |
| Schedule 13G/A, 2026-04-24 | Blackrock, Inc. | 8.2% |
| Schedule 13G/A, 2026-03-26 | The Vanguard Group | 0% |
| Schedule 13D/A, 2026-03-04 | Glencore International Ag | 29.99% |
| Schedule 13G/A, 2026-01-30 | The Vanguard Group | 7.43% |
| Schedule 13D/A, 2025-11-12 | Glencore International Ag | 36.6% |
Questions about who owns Century Aluminum Co.
Who owns Century Aluminum Co.?
On this page, 3 holders' latest ownership filings report 5% or more of Century Aluminum Co.: Glencore International Ag (29.99%, Schedule 13D/A, filed 2026-03-04), Blackrock, Inc. (10.5%, Schedule 13G/A, filed 2026-10-05) and State Street Corporation (5.6%, Schedule 13G, filed 2026-08-07).
Who are the largest shareholders of Century Aluminum Co.?
By the share each holder's latest filing reports, the largest holders of Century Aluminum Co. on this page are Glencore International Ag (29.99%), Blackrock, Inc. (10.5%) and State Street Corporation (5.6%).
When did Glencore International Ag buy into Century Aluminum Co.?
The filings give report dates, not purchase dates. The earliest filing from Glencore International Ag on this page is the Schedule 13D/A, filed 2025-11-12, reporting 36.6%; its latest, Schedule 13D/A filed 2026-03-04, reports 29.99%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 8 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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What the Full Report on Century Aluminum Co. covers
The Short Answer
Which Company This Is
What They Do, And How The Money Works
Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
13 cited sources found
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Which insiders own Century Aluminum Co. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- Glencore plc, a 10% owner: 12,184,755 shares (12.3% of shares outstanding), on a joint filing (Form 4, 2026-03-04).
- Glencore International AG, a 10% owner: 12,184,755 shares (12.3% of shares outstanding), on a joint filing (Form 4, 2026-03-04).
- Glencore AG, a 10% owner: 12,184,755 shares (12.3% of shares outstanding), on a joint filing (Form 4, 2026-03-04).
- , the chief executive and president: 419,807 shares (0.42% of shares outstanding), 277,227 held directly and 142,580 indirectly (Form 4, 2026-03-17).
- , a director: 211,123 shares (0.21% of shares outstanding) (Form 4, 2026-06-17).
Shares outstanding: 98,993,295 as of 2026-11-02, from the company's latest SEC cover page.
How much has Century Aluminum Co. raised?
Acquisitions reported on Form 8-K, Item 2.01: completed an acquisition (2026-02-02).
Keep reading
More on Century Aluminum Co. and the records around it.
Century Aluminum Co. elsewhere on the record
- 5%+ stake filings Oct 2026
Companies that share a holder
- STATE STREET CORPORATION also filed stake reports on 343 other companies: TRADE DESK INC/THE (Oct 2026), CENTRUS ENERGY CORP (Sep 2026), ACADIA PHARMACEUTICALS INC (Aug 2026)
- BlackRock, Inc. also filed stake reports on 1596 other companies: AvePoint, Inc. (Nov 2026), BIOMARIN PHARMACEUTICAL INC (Nov 2026), MSG RANGERS CORP (Nov 2026)
- The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)
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