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Livermore
Livermore
ZHEN

Century Aluminum Co

CENX
Exchange
Nasdaq
Industry
Primary Production of Aluminum
SEC CIK
0000949157

No open-market purchases or sales by Century Aluminum Co insiders were filed in the last 90 days; 416 institutions reported holding it in 13F filings for Q2 2026, worth $4.79B in total; no superinvestor holds it.

Holders of 5% or more of CENX

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Century Aluminum Co, largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of CENX
HolderLatest formStakeChangeFirst filedLatest filingFiling
Glencore International AG13D/A29.99%29.7M shares−6.61 ppfrom 36.60%Nov 12, 20252 filingsMar 4, 2026SEC
BlackRock, Inc.13G/A9.20%8.52M shares–Apr 17, 20251 filingApr 17, 2025SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

5 Schedule 13D and 13G filings on Century Aluminum Co, newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on CENX
Filed (ET)FilerFormStakeChangeEvent dateFiling
Mar 26, 20265:12 PM ETVanguard Group Inc13G/A0.00%0 shares−7.43 ppfrom 7.43%Below 5%Mar 13, 2026SEC
Mar 4, 20264:49 PM ETGlencore International AGand 2 others13D/A29.99%29.7M shares−6.61 ppfrom 36.60%Mar 4, 2026SEC
Jan 30, 20261:29 PM ETVanguard Group Inc13G/A7.43%6.94M shares–Dec 31, 2025SEC
Nov 12, 202510:02 AM ETGlencore International AGand 2 others13D/A36.60%36.0M shares–Nov 10, 2025SEC
Apr 17, 20259:35 AM ETBlackRock, Inc.13G/A9.20%8.52M shares–Mar 31, 2025SEC

Form 144: proposed insider sales

Notices from officers, directors and other affiliates planning to sell Century Aluminum Co shares.

No Form 144 notices for Century Aluminum Co are on file.