HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND

Pension

Position in CSTM — Constellium SE

CIK 1535845 TORONTO, A6

Position in CSTM

as of Mar 31, 2026 · filed May 14, 2026 Compact

Position Value

$50,544,738

+$46,646,898 QoQ

Shares Held

2,056,336

+894.4% QoQ

Ownership

1.51%

of shares outstanding

% of Portfolio

0.10%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Jun 2021

18 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Basic Materials · as of Mar 31, 2026

HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND holds $62,187,353 across 3 Aluminum names. CSTM ranks #1 (81.3% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	CSTM	Constellium SE This page	2,056,336	$50,544,738
2	CENX	Century Aluminum Co	184,061	$10,802,540
3	KALU	Kaiser Aluminum Corp	6,971	$840,075

18 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$50,544,738	2,056,336	+894.4%	Shares	Sole	2026-05-14
2025-12-31	$3,897,840	206,782	+25.9%	Shares	Sole	2026-02-13
2025-09-30	$2,444,784	164,300	+2380.0%	Shares	Sole	2025-11-13
2025-03-31	$66,846	6,625	-97.8%	Shares	Sole	2025-05-14
2024-12-31	$3,045,311	296,525	-38.9%	Shares	Sole	2025-02-14
2024-09-30	$7,886,506	485,025	-14.6%	Shares	Sole	2024-11-13
2024-06-30	$10,707,271	568,025	0.0%	Shares	Sole	2024-09-20
2024-03-31	$12,559,032	568,025	+17.1%	Shares	Sole	2024-05-13
2023-12-31	$9,681,099	485,025	-10.1%	Shares	Sole	2024-03-21
2023-09-30	$9,818,900	539,500	-8.9%	Shares	Sole	2023-11-13
2023-06-30	$10,188,316	592,344	+24.1%	Shares	Sole	2023-08-11
2023-03-31	$7,293,144	477,300	-42.9%	Shares	Sole	2023-05-12
2022-12-31	$9,883,965	835,500	-4.6%	Shares	Sole	2023-02-13
2022-09-30	$8,879,598	875,700	-0.1%	Shares	Sole	2022-11-14
2022-06-30	$11,585,170	877,000	+437.7%	Shares	Sole	2022-08-11
2022-03-31	$2,935,800	163,100	-73.6%	Shares	Sole	2022-05-12
2021-09-30	$11,592,894	617,300	-29.1%	Shares	Sole	2021-11-10
2021-06-30	$16,503,555	870,900	—	Shares	Sole	2021-08-12
No filing history on record for this holder in this stock.