Constellium Se CSTM Institutional Ownership

NYSE CSTM

$26.60 -0.31 (-1.15%)

At close: Sep 2, 2026 · 4:00 PM EDT

Institutions by Trading Activity

382 Institutions

Increased 255 66.8%

Unchanged 19 5.0%

Reduced 108 28.3%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

87.83%

▼-4.98 pp QoQ

Shares Held by Institutions

119.33Mn

of 135.87Mn outstanding

▼-1.88% QoQ

Shares Outstanding

135.87Mn

16.54Mn held outside 13F filers

Institutional Investors

382

filed 13F for Jun 2026

▲+73 vs prior quarter

Net Shares Added (QoQ)

-2.28Mn

distributed since last quarter

Value of Holdings

$3.21Bn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Quarter ending 30 Jun, 2026

Constellium Se (NYSE:CSTM) appears in 382 institutional 13F filings for the quarter ending June 2026.

These investors collectively held 87.8% of Constellium Se's outstanding shares in June 2026, down from 92.8% in March 2026.
They decreased total shares held in Constellium Se by -1.88% from last quarter, and the number of investors in CSTM increased 73.64% annually.
Activity in CSTM broke down as 255 buyers, 108 sellers, and 19 unchanged among 382 total holders.
The aggregate institutional position in Constellium Se amounted to 119.33Mn shares as of June 2026, down by 2.28Mn shares quarter on quarter, and down 11.88Mn shares year over year.
BlackRock, Inc. holds the largest position in CSTM at 12.8Mn shares as of June 30, 2026, or 9.42% of shares outstanding.
The biggest buyers of Constellium Se for the quarter ending June 2026 included Morgan Stanley (2.99Mn), AMERICAN CENTURY COMPANIES INC (2.14Mn), Kinetic Partners Management, LP (1.23Mn), Senator Investment Group LP (1.08Mn), MARSHALL WACE, LLP (1.08Mn).
The biggest sellers of Constellium Se for the quarter ending June 2026 included FMR LLC (4.77Mn), Bpifrance SA (4.19Mn), MILLENNIUM MANAGEMENT LLC (1.51Mn), D. E. Shaw & Co., Inc. (1.04Mn), T. Rowe Price Investment Management, Inc. (980.25K).
According to Business Quant data, leading holders of CSTM for June 2026 are BlackRock, Inc. (12.8Mn), Bpifrance SA (8.4Mn), Morgan Stanley (6.18Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (4.39Mn), AMERICAN CENTURY COMPANIES INC (4.22Mn), T. Rowe Price Investment Management, Inc. (2.98Mn), State Street Corp (2.95Mn), ARROWSTREET CAPITAL, LIMITED PARTNERSHIP (2.84Mn), Nuveen, LLC (2.77Mn), Kinetic Partners Management, LP (2.54Mn).

Form 13F Holdings

382 Institutional Holders

Report period 30 Jun, 2026

Total shares held 119.33Mn

Of outstanding 87.83%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	BlackRock, Inc.	0002012383	12,802,322	9.42%	▼161,881	-1.25%	$408.01Mn
2	Bpifrance SA	0001731118	8,403,903	6.19%	▼4,190,000	-33.27%	$267.83Mn
3	Morgan Stanley	0000895421	6,183,255	4.55%	▲2,987,201	+93.47%	$197.06Mn
4	VANGUARD PORTFOLIO MANAGEMENT LLC	0002100121	4,391,756	3.23%	▲464,659	+11.83%	$139.97Mn
5	AMERICAN CENTURY COMPANIES INC	0000748054	4,220,743	3.11%	▲2,135,264	+102.39%	$134.52Mn
6	T. Rowe Price Investment Management, Inc.	0001897612	2,980,566	2.19%	▼980,253	-24.75%	$94.99K
7	State Street Corp	0000093751	2,954,799	2.17%	▲191,304	+6.92%	$94.17Mn
8	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	0001164508	2,844,747	2.09%	▼383,280	-11.87%	$90.66Mn
9	Nuveen, LLC	0001871926	2,770,828	2.04%	▼56,903	-2.01%	$88.31Mn
10	Kinetic Partners Management, LP	0001911448	2,542,400	1.87%	▲1,230,000	+93.72%	$81.03Mn
11	Encompass Capital Advisors LLC	0001541901	2,421,349	1.78%	▼55,929	-2.26%	$77.17Mn
12	AQR CAPITAL MANAGEMENT LLC	0001167557	2,402,937	1.77%	▲328,076	+15.81%	$76.58Mn
13	HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND	0001535845	2,278,202	1.68%	▲221,866	+10.79%	$72.61Mn
14	D. E. Shaw & Co., Inc.	0001009207	2,198,618	1.62%	▼1,035,958	-32.03%	$70.07Mn
15	FMR LLC	0000315066	2,194,722	1.62%	▼4,767,046	-68.47%	$69.95Mn
16	ALLIANCEBERNSTEIN L.P.	0001109448	2,162,231	1.59%	▼154,777	-6.68%	$53.15Mn
17	ACADIAN ASSET MANAGEMENT LLC	0000916542	2,107,513	1.55%	▲834,642	+65.57%	$67.14K
18	Goldman Sachs Group Inc	0000886982	2,070,665	1.52%	▲698,889	+50.95%	$65.99Mn
19	MILLENNIUM MANAGEMENT LLC	0001273087	1,956,365	1.44%	▼1,513,726	-43.62%	$62.35Mn
20	BRIGHTLINE CAPITAL MANAGEMENT, LLC	0001432450	1,923,000	1.42%	▲76,000	+4.11%	$61.29Mn

Showing 1 to 20 of 382 holders