Who owns CSTM
Which tracked institutional funds hold CSTM, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See CSTM company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 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
161 tracked funds added or opened CSTM while 65 trimmed or exited it between 2026-Q1 and 2026-Q2 — 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
CSTM’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes CSTM more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in CSTM 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 2026-Q1 and 2026-Q2, across 366 tracked filers holding CSTM, 246 increased or opened the position and 160 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
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 CSTM between the 2026-Q1 and 2026-Q2 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 38
- Senator Investment Group LP$35M
- Jupiter Topco LLC$16M
- HENNESSY ADVISORS INC$9M
- NEUBERGER BERMAN GROUP LLC$8M
- TD Waterhouse Canada Inc.$6M
- BNP PARIBAS ASSET MANAGEMENT Holding S.A.$4M
Full exits 24
- T. Rowe Price Investment Management, Inc.$97M
- SG Americas Securities, LLC$37M
- ACADIAN ASSET MANAGEMENT LLC$31M
- COOPER CREEK PARTNERS MANAGEMENT LLC$19M
- HRT FINANCIAL LP$13M
- JANUS HENDERSON GROUP PLC$11M
Largest adds
- MORGAN STANLEY$119M
- BlackRock, Inc.$89M
- AMERICAN CENTURY COMPANIES INC$83M
- Kinetic Partners Management, LP$49M
- VANGUARD PORTFOLIO MANAGEMENT LLC$43M
- MARSHALL WACE, LLP$35M
Largest trims
- FMR LLC$101M
- Bpifrance SA$42M
- MILLENNIUM MANAGEMENT LLC$23M
- UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC$21M
- JANE STREET GROUP, LLC$16M
- Engineers Gate Manager LP$15M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. trimmed | 12,802,322 | $408M | 12.3% | 2026-Q2 |
| Bpifrance SA trimmed | 8,403,903 | $268M | 8.1% | 2026-Q2 |
| MORGAN STANLEY added | 6,183,255 | $197M | 5.9% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 4,391,756 | $140M | 4.2% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 4,220,743 | $135M | 4.1% | 2026-Q2 |
| STATE STREET CORP added | 2,954,799 | $94M | 2.8% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 2,844,747 | $91M | 2.7% | 2026-Q2 |
| Nuveen, LLC trimmed | 2,770,828 | $88M | 2.7% | 2026-Q2 |
| Kinetic Partners Management, LP added | 2,542,400 | $81M | 2.4% | 2026-Q2 |
| Encompass Capital Advisors LLC trimmed | 2,421,349 | $77M | 2.3% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 2,402,937 | $77M | 2.3% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND added | 2,278,202 | $73M | 2.2% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 2,198,618 | $70M | 2.1% | 2026-Q2 |
| FMR LLC trimmed | 2,194,722 | $70M | 2.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 2,162,231 | $53M | 1.6% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 2,070,665 | $66M | 2.0% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 1,956,365 | $62M | 1.9% | 2026-Q2 |
| BRIGHTLINE CAPITAL MANAGEMENT, LLC added | 1,923,000 | $61M | 1.8% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. trimmed | 1,856,018 | $59M | 1.8% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,789,723 | $57M | 1.7% | 2026-Q2 |
| SCOPUS ASSET MANAGEMENT, L.P. added | 1,731,708 | $55M | 1.7% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 1,146,089 | $36M | 1.1% | 2026-Q2 |
| WESTWOOD HOLDINGS GROUP INC trimmed | 1,099,362 | $35M | 1.1% | 2026-Q2 |
| MARSHALL WACE, LLP added | 1,093,740 | $35M | 1.1% | 2026-Q2 |
| Senator Investment Group LP new | 1,083,489 | $35M | 1.0% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC added | 1,048,331 | $33M | 1.0% | 2026-Q2 |
| NORTHERN TRUST CORP added | 984,446 | $31M | 0.9% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 957,579 | $31M | 0.9% | 2026-Q2 |
| Allianz Asset Management GmbH | 893,937 | $22M | 0.7% | 2026-Q2 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC trimmed | 882,306 | $28M | 0.8% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 838,604 | $27M | 0.8% | 2026-Q2 |
| Point72 Asset Management, L.P. trimmed | 821,701 | $26M | 0.8% | 2026-Q2 |
| BEACONLIGHT CAPITAL, LLC trimmed | 779,899 | $25M | 0.7% | 2026-Q2 |
| Penn Capital Management Company, LLC trimmed | 749,645 | $24M | 0.7% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 734,247 | $23M | 0.7% | 2026-Q2 |
| Bayberry Capital Partners LP trimmed | 655,000 | $21M | 0.6% | 2026-Q2 |
| DANSKE BANK A/S added | 642,706 | $20M | 0.6% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 641,403 | $20M | 0.6% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 622,121 | $20M | 0.6% | 2026-Q2 |
| MACKENZIE FINANCIAL CORP added | 592,538 | $19M | 0.6% | 2026-Q2 |
| Fisher Asset Management, LLC added | 552,416 | $18M | 0.5% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND trimmed | 520,203 | $17M | 0.5% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 512,254 | $16M | 0.5% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 498,794 | $16M | 0.5% | 2026-Q2 |
| Jupiter Topco LLC new | 494,899 | $16M | 0.5% | 2026-Q2 |
| Mountaineer Partners Management, LLC trimmed | 482,130 | $15M | 0.5% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 475,520 | $15M | 0.5% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 474,311 | $15M | 0.5% | 2026-Q2 |
| Trexquant Investment LP trimmed | 466,821 | $15M | 0.4% | 2026-Q2 |
| Bank of New York Mellon Corp added | 435,775 | $14M | 0.4% | 2026-Q2 |
| Cannell & Spears LLC trimmed | 416,875 | $13M | 0.4% | 2026-Q2 |
| OCCUDO QUANTITATIVE STRATEGIES LP added | 416,403 | $13M | 0.4% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 365,357 | $12M | 0.4% | 2026-Q2 |
| Man Group plc added | 359,310 | $11M | 0.3% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ added | 351,022 | $11M | 0.3% | 2026-Q2 |
| Hillsdale Investment Management Inc. added | 347,600 | $11M | 0.3% | 2026-Q2 |
| BEACON INVESTMENT ADVISORS LLC trimmed | 326,719 | $10M | 0.3% | 2026-Q2 |
| UBS Group AG trimmed | 312,141 | $10M | 0.3% | 2026-Q2 |
| Bridgewater Associates, LP trimmed | 311,558 | $10M | 0.3% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 295,567 | $9M | 0.3% | 2026-Q2 |
| HENNESSY ADVISORS INC new | 294,500 | $9M | 0.3% | 2026-Q2 |
| Creative Planning added | 291,696 | $9M | 0.3% | 2026-Q2 |
| SEI INVESTMENTS CO added | 289,041 | $9M | 0.3% | 2026-Q2 |
| LAZARD ASSET MANAGEMENT LLC added | 285,453 | $9M | 0.3% | 2026-Q2 |
| Kailix Advisors LLC trimmed | 278,200 | $9M | 0.3% | 2026-Q2 |
| ArrowMark Colorado Holdings LLC trimmed | 277,217 | $9M | 0.3% | 2026-Q2 |
| LPL Financial LLC added | 268,282 | $9M | 0.3% | 2026-Q2 |
| CVFG LLC trimmed | 266,220 | $8M | 0.3% | 2026-Q2 |
| ALGERT GLOBAL LLC trimmed | 264,290 | $8M | 0.3% | 2026-Q2 |
| Swiss National Bank added | 245,900 | $8M | 0.2% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC added | 244,069 | $8M | 0.2% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC new | 237,315 | $8M | 0.2% | 2026-Q2 |
| IEQ CAPITAL, LLC trimmed | 234,061 | $7M | 0.2% | 2026-Q2 |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC added | 218,767 | $7M | 0.2% | 2026-Q2 |
| Jump Financial, LLC added | 218,690 | $7M | 0.2% | 2026-Q2 |
| Soapstone Management L.P. trimmed | 200,000 | $6M | 0.2% | 2026-Q2 |
| Sequoia Financial Advisors, LLC added | 198,018 | $6M | 0.2% | 2026-Q2 |
| Engineers Gate Manager LP trimmed | 197,697 | $6M | 0.2% | 2026-Q2 |
| BANK OF MONTREAL /CAN/ trimmed | 197,229 | $6M | 0.2% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. added | 189,261 | $6M | 0.2% | 2026-Q2 |
| Hudson Bay Capital Management LP trimmed | 185,572 | $6M | 0.2% | 2026-Q2 |
| TD Waterhouse Canada Inc. added | 184,316 | $6M | 0.2% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 176,940 | $6M | 0.2% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 175,060 | $6M | 0.2% | 2026-Q2 |
| CAPITAL FUND MANAGEMENT S.A. added | 172,721 | $6M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 171,961 | $5M | 0.2% | 2026-Q2 |
| Rockingstone Advisors LLC trimmed | 171,808 | $5M | 0.2% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 164,723 | $5M | 0.2% | 2026-Q2 |
| MOORE CAPITAL MANAGEMENT, LP added | 159,438 | $5M | 0.2% | 2026-Q2 |
| MARTINGALE ASSET MANAGEMENT L P trimmed | 156,389 | $5M | 0.2% | 2026-Q2 |
| BARCLAYS PLC trimmed | 155,140 | $5M | 0.1% | 2026-Q2 |
| JANE STREET GROUP, LLC trimmed | 153,549 | $5M | 0.1% | 2026-Q2 |
| Voleon Capital Management LP trimmed | 145,101 | $5M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 142,434 | $5M | 0.1% | 2026-Q2 |
| NAVELLIER & ASSOCIATES INC added | 138,449 | $4M | 0.1% | 2026-Q2 |
| Mariner, LLC added | 138,055 | $4M | 0.1% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. new | 131,890 | $4M | 0.1% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 128,223 | $4M | 0.1% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 124,807 | $4M | 0.1% | 2026-Q2 |
| Invesco Ltd. trimmed | 122,064 | $4M | 0.1% | 2026-Q2 |
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.