Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in CENX held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | Glencore plc | 29.7M | $1.37B | 0.0% | 29.998% | 28.07% |
| 2 | BlackRock, Inc. | 10.3M | $474.1M | +14.4% | 10.412% | 0.01% |
| 3 | STATE STREET CORP | 5.5M | $255.0M | +18.8% | 5.600% | 0.00% |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | 4.8M | $219.6M | +12.6% | 4.823% | 0.01% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 3.0M | $136.8M | +14.9% | 3.003% | 0.00% |
| 6 | Invesco Ltd. | 2.4M | $111.2M | +16.4% | 2.443% | 0.01% |
| 7 | Sourcerock Group LLC | 2.3M | $104.3M | -15.7% | 2.290% | 5.42% |
| 8 | DIMENSIONAL FUND ADVISORS LP | 2.2M | $101.8M | +0.9% | 2.234% | 0.02% |
| 9 | UBS Group AG | 2.0M | $92.8M | +16.1% | 2.038% | 0.01% |
| 10 | FMR LLC | 2.0M | $90.2M | -26.3% | 1.981% | 0.00% |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | 1.8M | $85.0M | +19.9% | 1.866% | 0.00% |
| 12 | Fisher Asset Management, LLC | 1.5M | $70.6M | +80.2% | 1.550% | 0.02% |
| 13 | Assenagon Asset Management S.A. | 1.5M | $70.4M | -16.3% | 1.547% | 0.04% |
| 14 | MORGAN STANLEY | 1.5M | $69.5M | -4.7% | 1.526% | 0.00% |
| 15 | MILLENNIUM MANAGEMENT LLC | 1.1M | $51.8M | -43.3% | 1.138% | 0.02% |
| 16 | GOLDMAN SACHS GROUP INC | 1.0M | $48.3M | +176.8% | 1.060% | 0.00% |
| 17 | Impala Asset Management LLC | 1.0M | $47.6M | +6.2% | 1.046% | 27.00% |
| 18 | Encompass Capital Advisors LLC | 900K | $41.4M | -42.0% | 0.909% | 1.47% |
| 19 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 871K | $40.1M | +8.8% | 0.880% | 0.05% |
| 20 | Boston Partners | 854K | $39.3M | +175.6% | 0.863% | 0.03% |
| 21 | Qube Research & Technologies Ltd | 847K | $39.0M | +43.6% | 0.856% | 0.04% |
| 22 | D. E. Shaw & Co., Inc. | 805K | $37.0M | -45.5% | 0.813% | 0.02% |
| 23 | Kinetic Partners Management, LP | 777K | $35.7M | +46.1% | 0.785% | 0.85% |
| 24 | Allspring Global Investments Holdings, LLC | 827K | $35.6M | +47.1% | 0.836% | 0.05% |
| 25 | JANE STREET GROUP, LLC | 772K | $35.5M | -51.1% | 0.780% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in CENX — a direct measure of their conviction.
Filings activity in CENX during Q2 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 421 | +7.9% | 108.77% | +3.77 pp | $4.90B | 19% |
| Q1 2026 | 390 | +19% | 105.00% | 19.55 pp | $6.02B | +26% |
| Q4 2025 | 329 | +29% | 124.55% | +21.12 pp | $4.78B | +61% |
| Q3 2025 | 256 | +16% | 103.43% | +3.60 pp | $2.96B | +69% |
| Q2 2025 | 221 | +3.3% | 99.83% | +5.94 pp | $1.75B | +3.7% |
| Q1 2025 | 214 | 2.7% | 93.89% | 1.20 pp | $1.69B | +0.1% |
| Q4 2024 | 220 | +15% | 95.09% | +41.93 pp | $1.69B | +98% |
| Q3 2024 | 191 | — | 53.16% | — | $854M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying CENX stock.
Based on Q2 2026 13F filings, institutional ownership of Century Aluminum Company stands at 108.8%, held across 421 reporting institutions.
Glencore plc is the largest reported institutional holder of CENX, with approximately 29,690,702 shares worth $1.37B as of Q2 2026.
Yes — 3 widely-followed marquee investors appear among the top 25 institutional holders of CENX, including Fisher Asset Management, LLC, MILLENNIUM MANAGEMENT LLC, JANE STREET GROUP, LLC.
Our composite Smart Money Score for CENX is 78 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
84 institutions opened new positions in CENX during Q2 2026, while 58 fully exited. 86 added to existing positions and 239 trimmed.
CENX institutional ownership rose by 3.77 percentage points quarter-over-quarter, with a net change of +31 holders.
The top 10 institutions account for 60.2% of all reported 13F value in CENX, and the top 25 account for 75.5%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Century Aluminum Company (CENX) Institutional Ownership