Century Aluminum Company
Century Aluminum Company (CENX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · CENX · as of Mar 31, 2025
Ownership Breakdown
234
Institutional Holders
▼ 11 vs Q4
$1.72B
Total Inst. Value
▲ $34.83M vs Q4
98.97M
Shares Outstanding
freeFloat 59.53%
92.64M
13F Shares Held
▲ 207,830 vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
CENX largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
GLENCORE PLC primary production of aluminum | 40.04M | 42.91% | 42.91% | $743.11B | Apr 30, 2025 | ▲ 3.6K |
BLACKROCK, INC. primary production of aluminum | 9.89M | 10.60% | 10.60% | $183.61B | May 2, 2025 | ▼ 604.3K |
VANGUARD GROUP INC primary production of aluminum | 5.71M | 6.12% | 6.12% | $106.06B | May 9, 2025 | ▼ 136.5K |
STATE STREET CORP primary production of aluminum | 3.24M | 3.47% | 3.47% | $60.12B | May 15, 2025 | ▼ 97.9K |
DIMENSIONAL FUND ADVISORS LP primary production of aluminum | 2.84M | 3.04% | 3.04% | $52.67B | May 13, 2025 | ▼ 100.1K |
CITADEL ADVISORS LLC primary production of aluminum | 1.99M | 2.13% | 2.13% | $36.87B | May 15, 2025 | ▲ 1.67M |
MIRAE ASSET GLOBAL ETFS HOLDINGS LTD. primary production of aluminum | 1.46M | 1.57% | 1.57% | $27.15B | May 15, 2025 | ▼ 604.2K |
FISHER ASSET MANAGEMENT, LLC primary production of aluminum | 1.32M | 1.42% | 1.42% | $24.57B | May 14, 2025 | ▼ 58.0K |
GEODE CAPITAL MANAGEMENT, LLC primary production of aluminum | 1.29M | 1.39% | 1.39% | $24.03B | May 13, 2025 | ▲ 15.4K |
WEXFORD CAPITAL LP primary production of aluminum | 1.17M | 1.25% | 1.25% | $21.71B | May 15, 2025 | NEW |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
16
Increased
+3.31M shares12
New Positions
first time holders20
Decreased
−3.37M shares0
Sold Out
fully exitedNet shares change (top 50)
64.6K
+3.31M / −3.37M
Net new holders
+8
12 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
CENX insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
9
Buy transactions
14
Sell transactions
0.64
Buy/Sell ratio
$7M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Trpkovski Peter A EVP, CFO | Mar 25, 2026 | Sale | 16,739 | $50.51 | $845.5K | 64.1K | Form 4 ↗ |
Gary Jesse E President and CEO | Mar 16, 2026 | Sale | 150,000 | $55.47 | $8.32M | 142.6K | Form 4 ↗ |
Calloway Kenneth L SVP, Human Resources | Mar 12, 2026 | Sale | 18,000 | $58.00 | $1.04M | 24.9K | Form 4 ↗ |
Hoffman Robert F SVP, IT and CAO | Mar 11, 2026 | Sale | 10,529 | $56.51 | $595.0K | 56.6K | Form 4 ↗ |
Hoffman Robert F SVP, IT and CAO | Mar 4, 2026 | Sale | 10,000 | $56.33 | $563.3K | 67.2K | Form 4 ↗ |
Aboud Matt SVP, Strategy & Business Dev't | Mar 2, 2026 | Sale | 12,126 | $52.50 | $636.6K | 67.8K | Form 4 ↗ |
Aboud Matt SVP, Strategy & Business Dev't | Mar 3, 2026 | Sale | 2,971 | $52.67 | $156.5K | 64.8K | Form 4 ↗ |
GLENCORE INTERNATIONAL AG 10 percent owner | Mar 4, 2026 | Sale | 6,315,245 | $51.75 | $326.81M | 12.18M | Form 4 ↗ |
Hafberg Agust F SVP & Chief Commercial Officer | Feb 27, 2026 | Sale | 22,884 | $51.24 | $1.17M | 45.1K | Form 4 ↗ |
Gudlaugsson Gunnar EVP - Global Operations | Feb 25, 2026 | Sale | 43,000 | $54.10 | $2.33M | 136.4K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Century Aluminum Company (CENX) is primarily owned by institutional investors, who hold approximately 93.6% of total shares outstanding. Company insiders own approximately 40.47%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Century Aluminum Company is GLENCORE PLC, holding approximately 40.04 million shares — equal to 42.91% of outstanding shares — as of March 31, 2025.
A total of 234 institutional investors currently hold CENX stock, with a combined institutional value of approximately $1.72 billion as of the most recent 13F filing period.
Frequently asked questions
CENX ownershipCentury Aluminum Company (CENX) is primarily owned by institutional investors, who hold approximately 93.6% of shares. The largest shareholder is GLENCORE PLC with a 42.91% stake. Company insiders hold 40.47%. Data sourced from SEC Form 13F as of March 31, 2025.