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Buy Day today: Good (62) Broad market participation · no major macro event
CENX

Century Aluminum Company

Basic Materials · Aluminum

40.80$ +2.4% vs. previous close Closing price · As of: Sep 17, 2026

Ownership

Ownership Structure

Who owns Century Aluminum Company (CENX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 69.3% of the shares are freely tradable; institutional investors hold 74.5%.

Institutional ownership ?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings. 74.5%
Insiders ?Share of the stock held by the executives, founders and major shareholders of the company itself. 30.9%
Float ?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders. 69.3%
Short % of float ?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices. 14.8%
Shares Outstanding ?Total number of shares issued. Price times share count gives market cap. 99Mio.

Largest Shareholders

Institutions

Institutions CENX
Name Stake (%) Shares Change (%) Date
Glencore PLC 29.99 29,690,702 +0.0 06/30/2026
BlackRock Inc 9.10 9,010,379 -5.0 03/31/2026
State Street Corp 4.72 4,667,540 +8.7 03/31/2026
Vanguard Portfolio Management, LLC 4.28 4,241,557 +0.0 03/31/2026
FMR Inc 2.69 2,660,054 +30,454.3 03/31/2026
Vanguard Capital Management, LLC 2.61 2,586,107 +0.0 03/31/2026
Sourcerock Group LLC 2.29 2,266,085 -15.7 06/30/2026
Dimensional Fund Advisors, Inc. 2.23 2,211,502 +0.9 06/30/2026

Funds

Funds CENX
Name Stake (%) Shares Change (%) Date
iShares Core S&P Small-Cap ETF 3.47 3,437,659 -0.1 08/31/2026
Stt Strt®SPDR®S&P®Mtls &MngETF 3.18 3,150,844 -0.5 08/31/2026

Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.

Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)

Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.

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