CSTM Institutional Ownership & Shareholders
CONSTELLIUM SE (CSTM) is currently held by 373 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $3.81B based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of CSTM tracked by InsiderSet, reporting ownership valued at approximately $408.01M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $294.20M, representing an estimated loss of -27.89% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 42% of the total disclosed CSTM value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Bpifrance Sa, Morgan Stanley, and several other long-term asset managers with concentrated positions in CONSTELLIUM SE (CSTM).
This page ranks the largest institutional CSTM shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
373
Total Reported Value
$3.81B
Largest Holder
Blackrock, Inc.
Largest Position
$408.01M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
105
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.01% | 12,802,322 | $408,010,002 | $294,197,360 | -$113,812,642 | -27.89% | |
| Bpifrance Sa | 19.67% | 8,403,903 | $267,832,389 | $193,121,691 | -$74,710,698 | -27.89% | |
| Morgan Stanley | 0.01% | 6,183,255 | $197,060,369 | $142,091,200 | -$54,969,169 | -27.89% | |
| Vanguard Portfolio Management Llc | 0.01% | 4,391,756 | $139,965,264 | $100,922,553 | -$39,042,711 | -27.89% | |
| American Century Companies Inc | 0.06% | 4,220,743 | $134,515,143 | $96,992,674 | -$37,522,469 | -27.89% | |
| T. Rowe Price Investment Management, Inc. | 0.06% | 2,980,566 | $94,991,000 | $68,493,407 | -$26,497,593 | -27.89% | |
| State Street Corp | 0.00% | 2,954,799 | $94,169,444 | $67,901,281 | -$26,268,163 | -27.89% | |
| Arrowstreet Capital, Limited Partnership | 0.04% | 2,844,747 | $90,662,087 | $65,372,286 | -$25,289,801 | -27.89% | |
| Nuveen, Llc | 0.02% | 2,770,828 | $88,306,289 | $63,673,627 | -$24,632,662 | -27.89% | |
| Kinetic Partners Management, Lp | 1.93% | 2,542,400 | $81,026,288 | $58,424,352 | -$22,601,936 | -27.89% | |
| Encompass Capital Advisors Llc | 3.33% | 2,421,349 | $77,168,393 | $55,642,600 | -$21,525,793 | -27.89% | |
| Aqr Capital Management Llc | 0.03% | 2,402,937 | $76,581,596 | $55,219,492 | -$21,362,104 | -27.89% | |
| Healthcare Of Ontario Pension Plan Trust Fund | 0.10% | 2,278,202 | $72,606,298 | $52,353,082 | -$20,253,216 | -27.89% | |
| D. E. Shaw & Co., Inc. | 0.04% | 2,198,618 | $70,069,955 | $50,524,242 | -$19,545,713 | -27.89% | |
| Fmr Llc | 0.00% | 2,194,722 | $69,945,799 | $50,434,712 | -$19,511,087 | -27.89% | |
| Acadian Asset Management Llc | 0.08% | 2,107,513 | $67,142,000 | $48,430,649 | -$18,711,351 | -27.87% | |
| Goldman Sachs Group Inc | 0.01% | 2,070,665 | $65,992,094 | $47,583,882 | -$18,408,212 | -27.89% | |
| Millennium Management Llc | 0.04% | 1,956,365 | $62,349,353 | $44,957,268 | -$17,392,085 | -27.89% | |
| Brightline Capital Management, Llc | 13.28% | 1,923,000 | $61,286,010 | $44,190,540 | -$17,095,470 | -27.89% | |
| Nomura Asset Management International Inc. | 0.09% | 1,856,018 | $59,151,000 | $42,651,294 | -$16,499,706 | -27.89% | |
| Geode Capital Management, Llc | 0.00% | 1,789,723 | $57,033,036 | $41,127,835 | -$15,905,201 | -27.89% | |
| Scopus Asset Management, L.P. | 1.30% | 1,731,708 | $55,189,534 | $39,794,650 | -$15,394,884 | -27.89% | |
| Alliancebernstein L.P. | 0.02% | 2,162,231 | $53,147,638 | $49,688,068 | -$3,459,570 | -6.51% | |
| Allianz Asset Management Gmbh | 0.04% | 1,453,717 | $46,329,961 | $33,406,417 | -$12,923,544 | -27.89% | |
| Sg Americas Securities, Llc | 0.02% | 1,234,038 | $39,329,000 | $28,358,193 | -$10,970,807 | -27.89% | |
| Jpmorgan Chase & Co | 0.00% | 1,146,089 | $35,885,382 | $26,337,125 | -$9,548,257 | -26.61% | |
| Westwood Holdings Group Inc | 0.26% | 1,099,362 | $35,036,666 | $25,263,339 | -$9,773,327 | -27.89% | |
| Marshall Wace, Llp | 0.03% | 1,093,740 | $34,857,494 | $25,134,145 | -$9,723,349 | -27.89% | |
| Senator Investment Group Lp | 1.26% | 1,083,489 | $34,530,794 | $24,898,577 | -$9,632,217 | -27.89% | |
| Panagora Asset Management Inc | 0.10% | 1,048,331 | $33,410,309 | $24,090,646 | -$9,319,663 | -27.89% | |
| Northern Trust Corp | 0.00% | 984,446 | $31,374,294 | $22,622,569 | -$8,751,725 | -27.89% | |
| Bank Of America Corp | 0.00% | 957,579 | $30,518,042 | $22,005,165 | -$8,512,877 | -27.89% | |
| William Blair Investment Management, Llc | 0.08% | 882,306 | $28,119,092 | $20,275,392 | -$7,843,700 | -27.89% | |
| Hrt Financial Lp | 0.05% | 874,136 | $27,858,000 | $20,087,645 | -$7,770,355 | -27.89% | |
| Federated Hermes, Inc. | 0.04% | 838,604 | $26,726,309 | $19,271,120 | -$7,455,189 | -27.89% | |
| Point72 Asset Management, L.P. | 0.04% | 821,701 | $26,187,611 | $18,882,689 | -$7,304,922 | -27.89% | |
| Beaconlight Capital, Llc | 10.94% | 779,899 | $24,855,381 | $17,922,079 | -$6,933,302 | -27.89% | |
| Penn Capital Management Company, Llc | 1.52% | 749,645 | $23,934,215 | $17,226,842 | -$6,707,373 | -28.02% | |
| Charles Schwab Investment Management Inc | 0.00% | 734,247 | $23,400,452 | $16,872,996 | -$6,527,456 | -27.89% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 855,664 | $21,032,221 | $19,663,159 | -$1,369,062 | -6.51% | |
| Bayberry Capital Partners Lp | 7.19% | 655,000 | $20,874,850 | $15,051,900 | -$5,822,950 | -27.89% | |
| Danske Bank A/S | 0.04% | 642,706 | $20,483,040 | $14,769,384 | -$5,713,656 | -27.89% | |
| Balyasny Asset Management L.P. | 0.04% | 641,403 | $20,441,514 | $14,739,441 | -$5,702,073 | -27.89% | |
| Qube Research & Technologies Ltd | 0.02% | 622,121 | $19,826,996 | $14,296,341 | -$5,530,655 | -27.89% | |
| Mackenzie Financial Corp | 0.02% | 750,285 | $18,149,394 | $17,241,549 | -$907,845 | -5.00% | |
| Fisher Asset Management, Llc | 0.01% | 552,416 | $17,605,497 | $12,694,520 | -$4,910,977 | -27.89% | |
| New York State Common Retirement Fund | 0.02% | 520,203 | $16,578,870 | $11,954,265 | -$4,624,605 | -27.89% | |
| Raymond James Financial Inc | 0.00% | 512,254 | $16,325,535 | $11,771,597 | -$4,553,938 | -27.89% | |
| Wells Fargo & Company/Mn | 0.00% | 498,794 | $15,896,565 | $11,462,286 | -$4,434,279 | -27.89% | |
| Russell Investments Group, Ltd. | 0.01% | 475,520 | $15,131,341 | $10,927,450 | -$4,203,891 | -27.78% |
Frequently asked questions about CSTM
Who are the largest institutional holders of CSTM?
The largest institutional holders of CSTM reported in the latest SEC Form 13F filings include Blackrock, Inc., Bpifrance Sa, Morgan Stanley, Vanguard Portfolio Management Llc, and American Century Companies Inc. InsiderSet ranks institutional holders by their latest reported CSTM position.
What is CSTM institutional ownership?
This page tracks CSTM positions reported by institutional investment managers through SEC Form 13F. CONSTELLIUM SE (CSTM) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own CSTM?
InsiderSet currently tracks 373 institutional managers reporting CSTM holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of CSTM shareholders.
How much CSTM stock do institutions own?
Institutional investment managers disclosed approximately $3.81B in CSTM holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was CSTM institutional ownership last updated?
The latest CSTM institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional CSTM holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its CSTM position after the reporting date.
Are institutions buying or selling CSTM?
Institutional buying and selling can be analyzed by comparing CSTM positions across consecutive 13F reporting periods. InsiderSet's CSTM Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View CSTM ownership changes.
How has CSTM institutional ownership changed over time?
InsiderSet tracks CSTM institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.