CONSTELLIUM SE (CSTM) Institutional Shareholders
CONSTELLIUM SE (CSTM) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $3.83B in CSTM holdings during the latest filing period.
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 $327.10M, representing an estimated loss of -19.83% 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
378
Total Reported Value
$3.83B
Largest Holder
Blackrock, Inc.
Largest Position
$408.01M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
94
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 | $327,099,327 | -$80,910,675 | -19.83% | |
| Bpifrance Sa | 19.67% | 8,403,903 | $267,832,389 | $214,719,722 | -$53,112,667 | -19.83% | |
| Morgan Stanley | 0.01% | 6,183,255 | $197,060,369 | $157,982,165 | -$39,078,204 | -19.83% | |
| Vanguard Portfolio Management Llc | 0.01% | 4,391,756 | $139,965,264 | $112,209,366 | -$27,755,898 | -19.83% | |
| American Century Companies Inc | 0.06% | 4,220,743 | $134,515,143 | $107,839,984 | -$26,675,159 | -19.83% | |
| T. Rowe Price Investment Management, Inc. | 0.06% | 2,980,566 | $94,991,000 | $76,153,461 | -$18,837,539 | -19.83% | |
| State Street Corp | 0.00% | 2,954,799 | $94,169,444 | $75,495,114 | -$18,674,330 | -19.83% | |
| Arrowstreet Capital, Limited Partnership | 0.04% | 2,844,747 | $90,662,087 | $72,683,286 | -$17,978,801 | -19.83% | |
| Nuveen, Llc | 0.02% | 2,770,828 | $88,306,289 | $70,794,655 | -$17,511,634 | -19.83% | |
| Kinetic Partners Management, Lp | 1.93% | 2,542,400 | $81,026,288 | $64,958,320 | -$16,067,968 | -19.83% | |
| Encompass Capital Advisors Llc | 3.33% | 2,421,349 | $77,168,393 | $61,865,467 | -$15,302,926 | -19.83% | |
| Aqr Capital Management Llc | 0.03% | 2,402,937 | $76,581,596 | $61,395,040 | -$15,186,556 | -19.83% | |
| Healthcare Of Ontario Pension Plan Trust Fund | 0.10% | 2,278,202 | $72,606,298 | $58,208,061 | -$14,398,237 | -19.83% | |
| D. E. Shaw & Co., Inc. | 0.04% | 2,198,618 | $70,069,955 | $56,174,690 | -$13,895,265 | -19.83% | |
| Fmr Llc | 0.00% | 2,194,722 | $69,945,799 | $56,075,147 | -$13,870,652 | -19.83% | |
| Acadian Asset Management Llc | 0.08% | 2,107,513 | $67,142,000 | $53,846,957 | -$13,295,043 | -19.80% | |
| Goldman Sachs Group Inc | 0.01% | 2,070,665 | $65,992,094 | $52,905,491 | -$13,086,603 | -19.83% | |
| Millennium Management Llc | 0.04% | 1,956,365 | $62,349,353 | $49,985,126 | -$12,364,227 | -19.83% | |
| Brightline Capital Management, Llc | 13.28% | 1,923,000 | $61,286,010 | $49,132,650 | -$12,153,360 | -19.83% | |
| Nomura Asset Management International Inc. | 0.09% | 1,856,018 | $59,151,000 | $47,421,260 | -$11,729,740 | -19.83% | |
| Geode Capital Management, Llc | 0.00% | 1,789,723 | $57,033,036 | $45,727,423 | -$11,305,613 | -19.82% | |
| Scopus Asset Management, L.P. | 1.30% | 1,731,708 | $55,189,534 | $44,245,139 | -$10,944,395 | -19.83% | |
| Alliancebernstein L.P. | 0.02% | 2,162,231 | $53,147,638 | $55,245,002 | +$2,097,364 | +3.95% | |
| Allianz Asset Management Gmbh | 0.04% | 1,453,717 | $46,329,961 | $37,142,469 | -$9,187,492 | -19.83% | |
| Sg Americas Securities, Llc | 0.02% | 1,234,038 | $39,329,000 | $31,529,671 | -$7,799,329 | -19.83% | |
| Jpmorgan Chase & Co | 0.00% | 1,146,089 | $35,885,382 | $29,282,574 | -$6,602,808 | -18.40% | |
| Westwood Holdings Group Inc | 0.26% | 1,099,362 | $35,036,666 | $28,088,699 | -$6,947,967 | -19.83% | |
| Marshall Wace, Llp | 0.03% | 1,093,740 | $34,857,494 | $27,945,057 | -$6,912,437 | -19.83% | |
| Senator Investment Group Lp | 1.26% | 1,083,489 | $34,530,794 | $27,683,144 | -$6,847,650 | -19.83% | |
| Panagora Asset Management Inc | 0.10% | 1,048,331 | $33,410,309 | $26,784,857 | -$6,625,452 | -19.83% | |
| Northern Trust Corp | 0.00% | 984,446 | $31,374,294 | $25,152,595 | -$6,221,699 | -19.83% | |
| Bank Of America Corp | 0.00% | 957,579 | $30,518,042 | $24,466,143 | -$6,051,899 | -19.83% | |
| William Blair Investment Management, Llc | 0.08% | 882,306 | $28,119,092 | $22,542,918 | -$5,576,174 | -19.83% | |
| Hrt Financial Lp | 0.05% | 874,136 | $27,858,000 | $22,334,175 | -$5,523,825 | -19.83% | |
| Federated Hermes, Inc. | 0.04% | 838,604 | $26,726,309 | $21,426,332 | -$5,299,977 | -19.83% | |
| Point72 Asset Management, L.P. | 0.04% | 821,701 | $26,187,611 | $20,994,461 | -$5,193,150 | -19.83% | |
| Beaconlight Capital, Llc | 10.94% | 779,899 | $24,855,381 | $19,926,419 | -$4,928,962 | -19.83% | |
| Penn Capital Management Company, Llc | 1.52% | 749,645 | $23,934,215 | $19,153,430 | -$4,780,785 | -19.97% | |
| Charles Schwab Investment Management Inc | 0.00% | 734,247 | $23,400,452 | $18,760,011 | -$4,640,441 | -19.83% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 855,664 | $21,032,221 | $21,862,215 | +$829,994 | +3.95% | |
| Bayberry Capital Partners Lp | 7.19% | 655,000 | $20,874,850 | $16,735,250 | -$4,139,600 | -19.83% | |
| Danske Bank A/S | 0.04% | 642,706 | $20,483,040 | $16,421,138 | -$4,061,902 | -19.83% | |
| Balyasny Asset Management L.P. | 0.04% | 641,403 | $20,441,514 | $16,387,847 | -$4,053,667 | -19.83% | |
| Qube Research & Technologies Ltd | 0.02% | 622,121 | $19,826,996 | $15,895,192 | -$3,931,804 | -19.83% | |
| Mackenzie Financial Corp | 0.02% | 592,538 | $18,884,186 | $15,139,346 | -$3,744,840 | -19.83% | |
| Fisher Asset Management, Llc | 0.01% | 552,416 | $17,605,497 | $14,114,229 | -$3,491,268 | -19.83% | |
| New York State Common Retirement Fund | 0.02% | 520,203 | $16,578,870 | $13,291,187 | -$3,287,683 | -19.83% | |
| Raymond James Financial Inc | 0.00% | 512,254 | $16,325,535 | $13,088,090 | -$3,237,445 | -19.83% | |
| Wells Fargo & Company/Mn | 0.00% | 498,794 | $15,896,565 | $12,744,187 | -$3,152,378 | -19.83% | |
| Russell Investments Group, Ltd. | 0.01% | 475,520 | $15,131,341 | $12,149,536 | -$2,981,805 | -19.71% |
Frequently asked questions about CSTM
Who owns the most CSTM stock?
The largest holders of CSTM are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for CONSTELLIUM SE (CSTM).
Is CSTM widely held by superinvestors?
Many widely followed stocks like CSTM appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly CSTM is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.