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CENX · Century Aluminum Co

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Market Cap
$4.53B
Shares
98.99M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 419
Total Value: $4,952,027,973
Total Shares: 107,629,390
Showing 1–100 of 440 holdings by value · page 1 of 5

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 419 13F filers · Δ vs Mar 31, 2026
Top Holder
27.6%
Sep 2023 → Jun 2026 · range 16.7% – 41.7%
−0.9 pts
Top 5
49.5%
Sep 2023 → Jun 2026 · range 41.5% – 64.7%
+1.2 pts
Top 10
59.6%
Sep 2023 → Jun 2026 · range 55.7% – 73.3%
+0.3 pts
HHI
952
Sep 2023 → Jun 2026 · range 542 – 1,926
Broadly held−34

Quarterly Activity

vs Mar 31, 2026
New
90
Increased
175
Decreased
113
Sold Out
64
Unchanged
41
Holder count: +26
Institutional value: -19.0%
Shares held: +3.4%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 440
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 949157 CUSIP 156431108 13F (30d) 316 filings 314 filers Visit website Investor relations