As of November 6, 2026, 3 holders' latest Schedule 13D or 13G filings report owning 5% or more of Century Aluminum Co. The largest reported stake is Glencore International AG's, at 29.99%. 8 filings are on record since November 12, 2025 (Schedule 13D/A, March 4, 2026).
Sell to companies like Century Aluminum Co? Enter your website and see 10 with a filed reason to buy from you this month. Free.
Opens in a new tab. No signup.
Key facts
- · Reporting person: BlackRock, Inc. · Sole voting: 10,287,503 · Shared voting: 0 · Sole dispositive: 10,395,973 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-10-05
- · Reporting person: State Street Corporation · Sole voting: 0 · Shared voting: 5,372,092 · Sole dispositive: 0 · Shared dispositive: 5,542,720 · SCHEDULE 13G, 2026-08-07
- · Holder: BlackRock, Inc. · Percent: 9.5% · SCHEDULE 13G/A
- · Holder: BlackRock, Inc. · Percent: 8.2% · SCHEDULE 13G/A
- · Holder: The Vanguard Group · Percent: 0% · SCHEDULE 13G/A
Century Aluminum Co has 8 Schedule 13D or 13G filings on record since 2025-11-12. 3 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Glencore International AG | 29.99% | 29,690,702 | SCHEDULE 13D/A, 2026-03-04 | 2026-03-04 |
| BlackRock, Inc. | 10.5% | 10,395,973 | SCHEDULE 13G/A, 2026-10-05 | 2026-09-30 |
| State Street Corporation | 5.6% | 5,542,720 | SCHEDULE 13G, 2026-08-07 | 2026-06-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
Holding shares or following this stake? See who's behind Century Aluminum Co and the warning signs.
Free to see. No signup.
Keep reading
More on Century Aluminum Co and the records around it.
Century Aluminum Co elsewhere on the record
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)
Watch Century Aluminum Co
Get an email when Century Aluminum Co files again: a new raise, a leadership change, a layoff or an IPO filing. One email first to confirm; nothing else until you click it. At most one a day, one click to stop. Free for up to 3 companies.
Want the whole picture on Century Aluminum Co?
Example from a real report (our sample on Target): “Target eliminated approximately 1,800 corporate positions, with around 1,000 employees receiving layoff notices and the remainder accounted for by eliminating open roles.” Source: NBC News
A Full Report on Century Aluminum Co: verified, sourced, every claim cited, ready in a few minutes. See pricing.
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
8 cited sources found
Plus the sections for what you are deciding, which you pick after ordering.
A real finished report, first screen. Opens in a new tab.
Not ready to order yet? Keep this snapshot.
Sends this preview to you once; we won't add you to any list
Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| BlackRock, Inc. | 10,287,503 | 0 | 10,395,973 | 0 | SCHEDULE 13G/A, 2026-10-05 |
| State Street Corporation | 0 | 5,372,092 | 0 | 5,542,720 | SCHEDULE 13G, 2026-08-07 |
The latest filing identifies Century Aluminum Co by CUSIP 156431108 and gives its principal executive office as 1 SOUTH WACKER DRIVE, SUITE 1000, CHICAGO, IL 60606 (SCHEDULE 13G/A, 2026-10-05).
Purpose of Transaction (Item 4)
Glencore International AG
The Reporting Persons remain confident in the management team and outlook of the Company, maintain a position in the Company and intend to continue to hold Common Stock for investment purposes. On March 4, 2026, the Reporting Persons monetized a portion of their investment via a sale of 6,315,245 shares in a block trade pursuant to Rule 144 and subject to customary conditions (the "Subject Sale"). The Reporting Persons may purchase or sell additional shares of Common Stock and other securities of the Issuer. Such transactions could be in the open market and/or in privately negotiated or structured transactions, provided that any such transactions would be on terms deemed favorable by the Reporting Persons. In addition, the Reporting Persons may formulate plans or proposals for, hold discussions with the Company's management, the Company's Board of Directors, the Company's stockholders and other parties about, and reserve the right to explore, or make plans or proposals relating to, transactions, discussions or actions which relate to or would result in any of the matters specified in clauses (a) through (j) of Item 4 of Schedule 13D. The Reporting Persons' consideration or discussion of any action would be based on their own assessment of various relevant considerations and any subsequent developments affecting the Company and its prospects.Item 4 of the SCHEDULE 13D/A filed 2026-03-04
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-11-12 | Glencore International AG | 36.6% | SCHEDULE 13D/A |
| 2026-01-30 | The Vanguard Group | 7.43% | SCHEDULE 13G/A |
| 2026-03-04 | Glencore International AG | 29.99% | SCHEDULE 13D/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-24 | BlackRock, Inc. | 8.2% | SCHEDULE 13G/A |
| 2026-07-27 | BlackRock, Inc. | 9.5% | SCHEDULE 13G/A |
| 2026-08-07 | State Street Corporation | 5.6% | SCHEDULE 13G |
| 2026-10-05 | BlackRock, Inc. | 10.5% | SCHEDULE 13G/A |
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.
Tools for this story
Each opens in a new tab, filled in for Century Aluminum Co. With no account yet, you sign up free and land on the result.
Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.