Constellium Se CSTM Institutional Ownership

NYSE CSTM

$24.18 -0.41 (-1.67%)

At close: Sep 30, 2026 · 4:00 PM EDT

Institutions by Trading Activity

385 Institutions

Increased 257 66.8%

Unchanged 20 5.2%

Reduced 108 28.1%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

89.10%

▼-3.97 pp QoQ

Shares Held by Institutions

121.06Mn

of 135.87Mn outstanding

▼-1.81% QoQ

Shares Outstanding

135.87Mn

14.80Mn held outside 13F filers

Institutional Investors

385

filed 13F for Jun 2026

▲+73 vs prior quarter

Net Shares Added (QoQ)

-2.23Mn

distributed since last quarter

Value of Holdings

$2.93Bn

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) has 385 institutional investors that have filed 13F reports for the period ending June 2026.

They owned 89.1% of outstanding stock in June 2026, down from 93.1% the prior quarter.
They decreased total shares held in Constellium Se by -1.81% from the prior quarter, while the number of investors in CSTM increased 72.65% year over year.
Of these 385 holders, 257 added to their stakes in Constellium Se, 108 trimmed positions, and 20 made no changes.
The aggregate institutional position in Constellium Se amounted to 121.06Mn shares as of June 2026, down by 2.23Mn shares quarter on quarter, and down 9.65Mn shares year over year.
As of June 30, 2026, the biggest holder of Constellium Se is BlackRock, Inc. at 12.8Mn shares, representing 9.42% of shares outstanding.
The largest buyers of Constellium Se for the quarter ending June 2026 were 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).
Leading sellers of Constellium Se shares for the quarter ending June 2026 were 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).
Per Business Quant data, the top 10 holders of Constellium Se for the quarter ending 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

385 Institutional Holders

Report period 30 Jun, 2026

Total shares held 121.06Mn

Of outstanding 89.10%

#	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 385 holders