CONSTELLIUM SE (CSTM) — Institutional Holders, Q2 2026

390 institutional investment managers reported a CSTM position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $3.8B. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.

← CSTM stock profile

CSTM in Q2 2026: what funds did

Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.

New positions

109

Added to

143

Trimmed

110

Sold out

Biggest buyers

MORGAN STANLEYAdded · +2,987,201 sh+$95.2M
AMERICAN CENTURY COMPANIESAdded · +2,135,264 sh+$68.1M
Kinetic Partners ManagementAdded · +1,230,000 sh+$39.2M
Senator Investment GroupNew · +1,083,489 sh+$34.5M
MARSHALL WACE, LLPAdded · +1,079,965 sh+$34.4M

Biggest sellers

FMRTrimmed · -4,767,046 sh-$151.9M
Bpifrance SATrimmed · -4,190,000 sh-$133.5M
MILLENNIUM MANAGEMENTTrimmed · -1,513,726 sh-$48.2M
D. E. ShawTrimmed · -1,035,958 sh-$33.0M
T. Rowe Price Investment ManagementTrimmed · -980,253 sh-$31.2M

CSTM 13F holders ranked 1–100 of 390

Institutional investors reporting a position in CONSTELLIUM SE on SEC Form 13F-HR for Q2 2026, ranked by reported value.
#	Institution	Shares	Value	% of portfolio	QoQShares vs Q1 2026
1	BlackRock#1 · 12,802,322 sh	12,802,322	$408.0M	<0.01%	-1.2%
2	Bpifrance SA#2 · 8,403,903 sh	8,403,903	$267.8M	19.67%	-33.3%
3	MORGAN STANLEY#3 · 6,183,255 sh	6,183,255	$197.1M	0.01%	+93.5%
4	VANGUARD PORTFOLIO MANAGEMENT#4 · 4,391,756 sh	4,391,756	$140.0M	<0.01%	+11.8%
5	AMERICAN CENTURY COMPANIES#5 · 4,220,743 sh	4,220,743	$134.5M	0.06%	+102.4%
6	T. Rowe Price Investment Management#6 · 2,980,566 sh	2,980,566	$95.0M	0.06%	-24.7%
7	STATE STREET#7 · 2,954,799 sh	2,954,799	$94.2M	<0.01%	+6.9%
8	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP#8 · 2,844,747 sh	2,844,747	$90.7M	0.04%	-11.9%
9	Nuveen#9 · 2,770,828 sh	2,770,828	$88.3M	0.02%	-2.0%
10	Kinetic Partners Management#10 · 2,542,400 sh	2,542,400	$81.0M	1.93%	+93.7%
11	Encompass Capital Advisors#11 · 2,421,349 sh	2,421,349	$77.2M	2.75%	-2.3%
12	AQR CAPITAL MANAGEMENT#12 · 2,402,937 sh	2,402,937	$76.6M	0.03%	+15.8%
13	HEALTHCARE OF ONTARIO PENSION PLAN FUND#13 · 2,278,202 sh	2,278,202	$72.6M	0.10%	+10.8%
14	D. E. Shaw#14 · 2,198,618 sh	2,198,618	$70.1M	0.03%	-32.0%
15	FMR#15 · 2,194,722 sh	2,194,722	$69.9M	<0.01%	-68.5%
16	ACADIAN ASSET MANAGEMENT#16 · 2,107,513 sh	2,107,513	$67.1M	0.08%	+65.6%
17	GOLDMAN SACHS GROUP#17 · 2,070,665 sh	2,070,665	$66.0M	<0.01%	+50.9%
18	MILLENNIUM MANAGEMENT#18 · 1,956,365 sh	1,956,365	$62.3M	0.02%	-43.6%
19	BRIGHTLINE CAPITAL MANAGEMENT#19 · 1,923,000 sh	1,923,000	$61.3M	13.28%	+4.1%
20	NOMURA ASSET MANAGEMENT INTERNATIONAL#20 · 1,856,018 sh	1,856,018	$59.2M	0.09%	-3.0%
21	GEODE CAPITAL MANAGEMENT#21 · 1,789,723 sh	1,789,723	$57.0M	<0.01%	+7.3%
22	SCOPUS ASSET MANAGEMENT, L.P.#22 · 1,731,708 sh	1,731,708	$55.2M	0.78%	+3.0%
23	ALLIANCEBERNSTEIN L.P.#23 · 2,162,231 sh	2,162,231	$53.1M	0.02%	-6.7%
24	SG Americas Securities#24 · 1,234,038 sh	1,234,038	$39.3M	0.02%	-17.6%
25	JPMORGAN CHASE#25 · 1,146,089 sh	1,146,089	$35.9M	<0.01%	-44.1%
26	WESTWOOD GROUP#26 · 1,099,362 sh	1,099,362	$35.0M	0.26%	-21.6%
27	MARSHALL WACE, LLP#27 · 1,093,740 sh	1,093,740	$34.9M	0.03%	+7840.0%
28	Senator Investment Group#28 · 1,083,489 sh	1,083,489	$34.5M	1.26%	New
29	PANAGORA ASSET MANAGEMENT#29 · 1,048,331 sh	1,048,331	$33.4M	0.10%	+48.7%
30	NORTHERN#30 · 984,446 sh	984,446	$31.4M	<0.01%	+0.7%
31	BANK OF AMERICA#31 · 957,579 sh	957,579	$30.5M	<0.01%	+12.5%
32	WILLIAM BLAIR INVESTMENT MANAGEMENT#32 · 882,306 sh	882,306	$28.1M	0.08%	-3.9%
33	HRT FINANCIAL#33 · 874,136 sh	874,136	$27.9M	0.07%	+68.5%
34	FEDERATED HERMES#34 · 838,604 sh	838,604	$26.7M	0.04%	+28.5%
35	Point72 Asset Management, L.P.#35 · 821,701 sh	821,701	$26.2M	0.03%	-18.3%
36	BEACONLIGHT CAPITAL#36 · 779,899 sh	779,899	$24.9M	8.78%	-33.4%
37	Penn Capital Management Company#37 · 749,645 sh	749,645	$23.9M	1.52%	-11.3%
38	CHARLES SCHWAB INVESTMENT MANAGEMENT#38 · 734,247 sh	734,247	$23.4M	<0.01%	-6.3%
39	Allianz Asset Management GmbH#39 · 893,937 sh	893,937	$22.0M	0.02%	0.0%
40	Bayberry Capital Partners#40 · 655,000 sh	655,000	$20.9M	7.19%	-25.1%
41	DANSKE BANK A/S#41 · 642,706 sh	642,706	$20.5M	0.04%	+62.5%
42	BALYASNY ASSET MANAGEMENT L.P.#42 · 641,403 sh	641,403	$20.4M	0.03%	-19.4%
43	Qube Research & Technologies Ltd#43 · 622,121 sh	622,121	$19.8M	0.02%	+32.1%
44	MACKENZIE FINANCIAL#44 · 592,538 sh	592,538	$18.9M	0.02%	+226.5%
45	Fisher Asset Management#45 · 552,416 sh	552,416	$17.6M	<0.01%	+2.4%
46	NEW YORK STATE COMMON RETIREMENT FUND#46 · 520,203 sh	520,203	$16.6M	0.02%	-8.8%
47	RAYMOND JAMES FINANCIAL#47 · 512,254 sh	512,254	$16.3M	<0.01%	+55.8%
48	WELLS FARGO & COMPANY#48 · 498,794 sh	498,794	$15.9M	<0.01%	+424.4%
49	Jupiter Topco#49 · 494,899 sh	494,899	$15.8M	<0.01%	—
50	Mountaineer Partners Management#50 · 482,130 sh	482,130	$15.4M	11.64%	-26.8%
51	Russell Investments Group, Ltd.#51 · 475,520 sh	475,520	$15.1M	0.01%	+2.2%
52	CITADEL ADVISORS#52 · 474,311 sh	474,311	$15.1M	<0.01%	-38.4%
53	Trexquant Investment#53 · 466,821 sh	466,821	$14.9M	0.09%	-3.4%
54	COOPER CREEK PARTNERS MANAGEMENT#54 · 441,835 sh	441,835	$14.1M	0.33%	-42.2%
55	Bank of New York Mellon#55 · 435,775 sh	435,775	$13.9M	<0.01%	+9.6%
56	Spears Abacus Advisors#56 · 416,875 sh	416,875	$13.3M	0.24%	-54.1%
57	OCCUDO QUANTITATIVE STRATEGIES#57 · 416,403 sh	416,403	$13.3M	0.70%	+104.8%
58	TWO SIGMA INVESTMENTS#58 · 365,357 sh	365,357	$11.6M	<0.01%	+26.5%
59	Man Group plc#59 · 359,310 sh	359,310	$11.5M	0.02%	+197.8%
60	MASSACHUSETTS FINANCIAL SERVICES#60 · 351,022 sh	351,022	$11.2M	<0.01%	+3.9%
61	Hillsdale Investment Management#61 · 347,600 sh	347,600	$11.1M	0.25%	+9.8%
62	BEACON INVESTMENT ADVISORS#62 · 326,719 sh	326,719	$10.4M	3.27%	-0.1%
63	LSV ASSET MANAGEMENT#63 · 320,300 sh	320,300	$10.2M	0.02%	+37.2%
64	UBS Group AG#64 · 312,141 sh	312,141	$9.9M	<0.01%	-33.8%
65	Bridgewater Associates#65 · 311,558 sh	311,558	$9.9M	0.04%	-38.1%
66	FRANKLIN RESOURCES#66 · 295,567 sh	295,567	$9.4M	<0.01%	+2.2%
67	HENNESSY ADVISORS#67 · 294,500 sh	294,500	$9.4M	0.30%	New
68	Creative Planning#68 · 291,696 sh	291,696	$9.3M	<0.01%	+20.2%
69	SEI INVESTMENTS#69 · 289,041 sh	289,041	$9.2M	<0.01%	+24.7%
70	LAZARD ASSET MANAGEMENT#70 · 285,453 sh	285,453	$9.1M	0.01%	+227.7%
71	Kailix Advisors#71 · 278,200 sh	278,200	$8.9M	8.56%	-43.7%
72	ArrowMark Colorado#72 · 277,217 sh	277,217	$8.8M	0.37%	-44.3%
73	LPL Financial#73 · 268,282 sh	268,282	$8.6M	<0.01%	+247.8%
74	CVFG#74 · 266,220 sh	266,220	$8.5M	0.89%	-2.6%
75	ALGERT GLOBAL#75 · 264,290 sh	264,290	$8.4M	0.10%	-26.4%
76	GW&K Investment Management#76 · 254,026 sh	254,026	$8.1M	0.06%	-1.4%
77	Swiss National Bank#77 · 245,900 sh	245,900	$7.8M	<0.01%	+0.2%
78	Schonfeld Strategic Advisors#78 · 244,069 sh	244,069	$7.8M	0.03%	+87.3%
79	Neuberger Berman Group#79 · 237,315 sh	237,315	$7.6M	<0.01%	New
80	IEQ CAPITAL#80 · 234,061 sh	234,061	$7.5M	0.03%	-12.0%
81	O'SHAUGHNESSY ASSET MANAGEMENT#81 · 218,767 sh	218,767	$7.0M	0.03%	+462.4%
82	Jump Financial#82 · 218,690 sh	218,690	$7.0M	0.06%	+1412.4%
83	Soapstone Management L.P.#83 · 200,000 sh	200,000	$6.4M	4.64%	-75.0%
84	Sequoia Financial Advisors#84 · 198,018 sh	198,018	$6.3M	0.03%	+0.4%
85	KBC Group NV#85 · 197,790 sh	197,790	$6.3M	—	0.0%
86	Engineers Gate Manager#86 · 197,697 sh	197,697	$6.3M	0.08%	-77.6%
87	BANK OF MONTREAL#87 · 197,229 sh	197,229	$6.3M	<0.01%	-4.8%
88	Connor, Clark & Lunn Investment Management Ltd.#88 · 189,261 sh	189,261	$6.0M	0.01%	+12.0%
89	Hudson Bay Capital Management#89 · 185,572 sh	185,572	$5.9M	0.02%	-53.8%
90	PRUDENTIAL FINANCIAL#90 · 176,940 sh	176,940	$5.6M	<0.01%	+91.0%
91	TD Waterhouse Canada#91 · 184,316 sh	184,316	$5.6M	—	New
92	DEUTSCHE BANK AG\#92 · 175,060 sh	175,060	$5.6M	<0.01%	+3.8%
93	CAPITAL FUND MANAGEMENT S.A.#93 · 172,721 sh	172,721	$5.5M	0.02%	+140.3%
94	RHUMBLINE ADVISERS#94 · 171,961 sh	171,961	$5.5M	<0.01%	+9.2%
95	Rockingstone Advisors#95 · 171,808 sh	171,808	$5.5M	—	-10.4%
96	AMERIPRISE FINANCIAL#96 · 164,723 sh	164,723	$5.2M	<0.01%	+68.0%
97	MOORE CAPITAL MANAGEMENT#97 · 159,438 sh	159,438	$5.1M	0.08%	+56.5%
98	MARTINGALE ASSET MANAGEMENT L P#98 · 156,389 sh	156,389	$5.0M	0.12%	-2.6%
99	BARCLAYS PLC#99 · 155,140 sh	155,140	$4.9M	<0.01%	-10.3%
100	JANE STREET GROUP#100 · 153,549 sh	153,549	$4.9M	<0.01%	-81.6%

Funds that sold out of CSTM in Q2 2026 (30)

Held CSTM at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.

Institutions that held CSTM in Q1 2026 and reported no position in Q2 2026.
Institution	Shares sold	Value in Q1 2026
BW Gestao de Investimentos Ltda.207,096 sh	207,096	$5.1M
THORNBURG INVESTMENT MANAGEMENT205,467 sh	205,467	$5.1M
LGT Fund Management Ltd.164,700 sh	164,700	$4.0M
Premier Fund Managers Ltd128,865 sh	128,865	$3.0M
TWINBEECH CAPITAL93,141 sh	93,141	$2.3M
Lighthouse Investment Partners42,672 sh	42,672	$1.0M
Verition Fund Management29,371 sh	29,371	$721.9K
Blackstone19,351 sh	19,351	$475.6K
Andina Capital Management18,114 sh	18,114	$445.2K
Centiva Capital17,728 sh	17,728	$435.8K
Cynosure Management16,404 sh	16,404	$403.2K
Advisors Asset Management15,619 sh	15,619	$383.9K
Crescent Grove Advisors14,485 sh	14,485	$356.0K
OXFORD ASSET MANAGEMENT LLP10,606 sh	10,606	$260.7K
Abacus Wealth Partners10,092 sh	10,092	$248.1K
TWO SIGMA SECURITIES9,728 sh	9,728	$239.1K
S.E.E.D. Planning Group9,500 sh	9,500	$233.5K
Collaborative Fund Advisors8,283 sh	8,283	$203.6K
QUADRANT CAPITAL GROUP7,354 sh	7,354	$139.3K
Plato Investment Management Ltd1,781 sh	1,781	$43.8K
Matrix1,152 sh	1,152	$28.0K
Advisory Services Network816 sh	816	$20.1K
EASTERN BANK740 sh	740	$18.2K
Optiver Holding B.V.440 sh	440	$10.8K
Root Financial Partners422 sh	422	$10.4K
J.Safra Asset Management217 sh	217	$5.3K
Intentional Wealth Strategies144 sh	144	$3.5K
Wealth Preservation Advisors97 sh	97	$2.4K
Frazier Financial Advisors19 sh	19	$468.00
TWIN PEAKS WEALTH ADVISORS4 sh	4	$98.00

Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.