Who owns CENX (CENX)
Which tracked institutional funds hold CENX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See CENX company fundamentals →
Ownership as of the 2026-Q1 13F filings. 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
175 tracked funds added or opened CENX while 64 trimmed or exited it between 2025-Q4 and 2026-Q1 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
CENX’s largest tracked holder by dollar value, Glencore plc, sizes it at 29.5% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 29.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in CENX divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 382 tracked filers holding CENX, 231 increased or opened the position and 173 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in CENX between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 47
- VANGUARD PORTFOLIO MANAGEMENT LLC$249M
- VANGUARD CAPITAL MANAGEMENT LLC$152M
- Kinetic Partners Management, LP$31M
- Merewether Investment Management, LP$30M
- Rokos Capital Management LLP$26M
- VANGUARD FIDUCIARY TRUST CO$22M
Full exits 28
- VANGUARD GROUP INC$254M
- ANTIPODES PARTNERS Ltd$17M
- Trek Financial, LLC$11M
- Walleye Trading LLC$10M
- Wealth High Governance Capital Ltda$6M
- Kailix Advisors LLC$6M
Largest adds
- FMR LLC$144M
- STATE STREET CORP$106M
- Invesco Ltd.$93M
- JANE STREET GROUP, LLC$76M
- Assenagon Asset Management S.A.$73M
- Encompass Capital Advisors LLC$71M
Largest trims
- Glencore plc$354M
- BlackRock, Inc.$26M
- AMERICAN CENTURY COMPANIES INC$25M
- UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC$24M
- MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.$12M
- Burkehill Global Management, LP$11M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Glencore plc trimmed | 29,690,702 | $1.7B | 30.3% | 2026-Q1 |
| BlackRock, Inc. trimmed | 5,889,226 | $346M | 6.0% | 2026-Q1 |
| STATE STREET CORP added | 4,667,540 | $274M | 4.8% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 4,241,557 | $249M | 4.3% | 2026-Q1 |
| Sourcerock Group LLC trimmed | 2,687,249 | $158M | 2.7% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 2,586,107 | $152M | 2.6% | 2026-Q1 |
| FMR LLC added | 2,459,198 | $144M | 2.5% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 2,190,922 | $129M | 2.2% | 2026-Q1 |
| Invesco Ltd. added | 2,009,965 | $118M | 2.1% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 1,987,625 | $117M | 2.0% | 2026-Q1 |
| Assenagon Asset Management S.A. added | 1,830,324 | $107M | 1.9% | 2026-Q1 |
| MORGAN STANLEY trimmed | 1,585,230 | $93M | 1.6% | 2026-Q1 |
| Encompass Capital Advisors LLC added | 1,551,362 | $91M | 1.6% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,540,212 | $90M | 1.6% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 1,433,369 | $84M | 1.5% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 1,320,942 | $78M | 1.3% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 1,320,867 | $78M | 1.3% | 2026-Q1 |
| Impala Asset Management LLC added | 975,000 | $57M | 1.0% | 2026-Q1 |
| Fisher Asset Management, LLC trimmed | 851,301 | $50M | 0.9% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. trimmed | 800,131 | $47M | 0.8% | 2026-Q1 |
| Bridgewater Associates, LP added | 732,517 | $43M | 0.7% | 2026-Q1 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 720,735 | $42M | 0.7% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 608,794 | $36M | 0.6% | 2026-Q1 |
| Allspring Global Investments Holdings, LLC added | 562,030 | $36M | 0.6% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 598,025 | $35M | 0.6% | 2026-Q1 |
| Qube Research & Technologies Ltd trimmed | 589,928 | $35M | 0.6% | 2026-Q1 |
| UBS Group AG trimmed | 586,766 | $34M | 0.6% | 2026-Q1 |
| Mountaineer Partners Management, LLC trimmed | 583,997 | $34M | 0.6% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 569,451 | $33M | 0.6% | 2026-Q1 |
| NORTHERN TRUST CORP added | 548,744 | $32M | 0.6% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 544,511 | $32M | 0.6% | 2026-Q1 |
| Bornite Capital Management LP added | 542,000 | $32M | 0.6% | 2026-Q1 |
| Kinetic Partners Management, LP new | 531,700 | $31M | 0.5% | 2026-Q1 |
| Merewether Investment Management, LP new | 514,800 | $30M | 0.5% | 2026-Q1 |
| Jefferies Financial Group Inc. added | 484,193 | $28M | 0.5% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 516,623 | $28M | 0.5% | 2026-Q1 |
| Rokos Capital Management LLP new | 436,688 | $26M | 0.4% | 2026-Q1 |
| Squarepoint Ops LLC added | 410,093 | $24M | 0.4% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 379,148 | $22M | 0.4% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 378,295 | $22M | 0.4% | 2026-Q1 |
| Westend Capital Management, LLC added | 378,073 | $22M | 0.4% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP added | 371,026 | $22M | 0.4% | 2026-Q1 |
| Bank of New York Mellon Corp added | 335,864 | $20M | 0.3% | 2026-Q1 |
| Boston Partners trimmed | 309,896 | $18M | 0.3% | 2026-Q1 |
| Nuveen, LLC added | 308,977 | $18M | 0.3% | 2026-Q1 |
| BW Gestao de Investimentos Ltda. added | 308,758 | $18M | 0.3% | 2026-Q1 |
| Engineers Gate Manager LP added | 297,509 | $17M | 0.3% | 2026-Q1 |
| PICTON MAHONEY ASSET MANAGEMENT new | 295,330 | $17M | 0.3% | 2026-Q1 |
| Nicholas Investment Partners, LP added | 292,402 | $17M | 0.3% | 2026-Q1 |
| Drummond Knight Asset Management Pty Ltd trimmed | 281,092 | $16M | 0.3% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL trimmed | 279,161 | $16M | 0.3% | 2026-Q1 |
| Steamboat Capital Partners, LLC trimmed | 276,248 | $16M | 0.3% | 2026-Q1 |
| CANADA LIFE ASSURANCE Co added | 275,405 | $16M | 0.3% | 2026-Q1 |
| ROYCE & ASSOCIATES LP trimmed | 264,341 | $16M | 0.3% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC trimmed | 260,426 | $15M | 0.3% | 2026-Q1 |
| CONGRESS ASSET MANAGEMENT CO added | 253,435 | $15M | 0.3% | 2026-Q1 |
| CDC Financial, Inc. trimmed | 246,680 | $14M | 0.3% | 2026-Q1 |
| Public Sector Pension Investment Board added | 243,897 | $14M | 0.2% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 232,034 | $14M | 0.2% | 2026-Q1 |
| BANK OF MONTREAL /CAN/ added | 227,736 | $13M | 0.2% | 2026-Q1 |
| Yaupon Capital Management LP trimmed | 211,201 | $12M | 0.2% | 2026-Q1 |
| HRT FINANCIAL LP added | 195,992 | $12M | 0.2% | 2026-Q1 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND added | 184,061 | $11M | 0.2% | 2026-Q1 |
| ICON ADVISERS INC/CO trimmed | 173,200 | $10M | 0.2% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 165,436 | $10M | 0.2% | 2026-Q1 |
| First Eagle Investment Management, LLC trimmed | 163,087 | $10M | 0.2% | 2026-Q1 |
| CIBC WORLD MARKET INC. added | 160,632 | $9M | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 158,208 | $9M | 0.2% | 2026-Q1 |
| SYSTEMATIC FINANCIAL MANAGEMENT LP trimmed | 157,722 | $9M | 0.2% | 2026-Q1 |
| CSM Advisors, LLC trimmed | 155,684 | $9M | 0.2% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 151,938 | $9M | 0.2% | 2026-Q1 |
| Burkehill Global Management, LP trimmed | 150,000 | $9M | 0.2% | 2026-Q1 |
| Insight Wealth Strategies, LLC trimmed | 146,024 | $9M | 0.1% | 2026-Q1 |
| BARCLAYS PLC added | 143,299 | $8M | 0.1% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 139,499 | $8M | 0.1% | 2026-Q1 |
| FRANKLIN RESOURCES INC added | 124,816 | $7M | 0.1% | 2026-Q1 |
| COHEN & STEERS, INC. trimmed | 118,183 | $7M | 0.1% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 113,252 | $7M | 0.1% | 2026-Q1 |
| Legal & General Group Plc trimmed | 112,563 | $7M | 0.1% | 2026-Q1 |
| Swiss National Bank | 110,450 | $6M | 0.1% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC trimmed | 109,592 | $6M | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. added | 159,508 | $6M | 0.1% | 2026-Q1 |
| Edgestream Partners, L.P. trimmed | 105,739 | $6M | 0.1% | 2026-Q1 |
| BESSEMER GROUP INC added | 102,496 | $6M | 0.1% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 100,631 | $6M | 0.1% | 2026-Q1 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 100,242 | $6M | 0.1% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 96,317 | $6M | 0.1% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 95,068 | $6M | 0.1% | 2026-Q1 |
| Portolan Capital Management, LLC new | 95,039 | $6M | 0.1% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd trimmed | 90,400 | $5M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC added | 6,485,846 | $254M | 4.4% | 2025-Q4 stale |
| ANTIPODES PARTNERS Ltd added | 423,789 | $17M | 0.3% | 2025-Q4 stale |
| Pertento Partners LLP added | 733,885 | $14M | 0.2% | 2025-Q1 stale |
| Trek Financial, LLC new | 281,376 | $11M | 0.2% | 2025-Q4 stale |
| Walleye Trading LLC added | 250,562 | $10M | 0.2% | 2025-Q4 stale |
| Penn Capital Management Company, LLC added | 518,374 | $10M | 0.2% | 2025-Q1 stale |
| Foundry Partners, LLC new | 327,421 | $6M | 0.1% | 2025-Q1 stale |
| Wealth High Governance Capital Ltda added | 152,566 | $6M | 0.1% | 2025-Q4 stale |
| Kailix Advisors LLC new | 146,550 | $6M | 0.1% | 2025-Q4 stale |
| Park West Asset Management LLC new | 309,258 | $6M | 0.1% | 2025-Q1 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.