Constellium SE
US ˙ NYSE ˙ FR0013467479

SecurityCSTM / Constellium SE
InstitutionSei Investments Co
Latest Disclosed Ownership89,434 shares
Latest Disclosed Value $ 1,685,849
Sei Investments Co reports 12.88% decrease in ownership of CSTM / Constellium SE

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 89,434 shares of Constellium SE (US:CSTM) valued at $1,685,831 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 102,658 shares of Constellium SE. This represents a change in shares of -12.88% during the quarter. The current value of the position is $3,207,103 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-02-13 2025-12-31 13F CONSTELLIUM SE CL A SHS F21107101 89,434 -13,224 -12.88 1,686 10.35 0.0017
2025-11-13 2025-09-30 13F CONSTELLIUM SE CL A SHS F21107101 102,658 -5,574 -5.15 1,528 6.12 0.0016
2025-08-14 2025-06-30 13F CONSTELLIUM SE CL A SHS F21107101 108,232 -641,453 -85.56 1,440 -80.98 0.0017
2025-05-14 2025-03-31 13F/A-1 CONSTELLIUM SE CL A SHS F21107101 749,685 -9,850 -1.30 7,564 -3.03 0.0097
2025-05-13 2025-03-31 13F CONSTELLIUM SE CL A SHS F21107101 760,473 938 7,810 0.0085
2025-02-11 2024-12-31 13F CONSTELLIUM SE CL A SHS F21107101 759,535 -16,733 -2.16 7,800 -38.20 0.0100
2024-11-12 2024-09-30 13F CONSTELLIUM SE CL A SHS F21107101 776,268 377,265 94.55 12,622 67.82 0.0164
2024-08-13 2024-06-30 13F CONSTELLIUM SE CL A SHS F21107101 399,003 119,355 42.68 7,521 21.64 0.0107
2024-05-07 2024-03-31 13F CONSTELLIUM SE CL A SHS F21107101 279,648 176,158 170.22 6,183 199.42 0.0091
2024-02-14 2023-12-31 13F CONSTELLIUM SE CL A SHS F21107101 103,490 -27,311 -20.88 2,066 -13.24 0.0033
2023-11-14 2023-09-30 13F CONSTELLIUM SE CL A SHS F21107101 130,801 -56,606 -30.20 2,381 -26.16 0.0043
2023-08-11 2023-06-30 13F CONSTELLIUM SE CL A SHS F21107101 187,407 140,300 297.83 3,223 348.26 0.0056
2023-05-12 2023-03-31 13F CONSTELLIUM SE CL A SHS F21107101 47,107 24,862 111.76 720 173.38 0.0013
2023-02-10 2022-12-31 13F CONSTELLIUM SE CL A SHS F21107101 22,245 -11,484 -34.05 263 -23.10 0.0006
2022-11-14 2022-09-30 13F CONSTELLIUM SE CL A SHS F21107101 33,729 -4,203 -11.08 342 -31.46 0.0008
2022-08-15 2022-06-30 13F CONSTELLIUM SE CL A SHS F21107101 37,932 37,932 499 0.0011
2022-02-14 2021-12-31 13F CONSTELLIUM SE CL A SHS F21107101 0 -10,999 -100.00 0 -100.00
2021-11-12 2021-09-30 13F CONSTELLIUM SE CL A SHS F21107101 10,999 -112,269 -91.08 205 -87.59 0.0004
2020-08-11 2020-06-30 13F CONSTELLIUM SE CL A SHS F21107101 123,268 44,055 55.62 1,652 300.00 0.0052
2020-05-14 2020-03-31 13F CONSTELLIUM SE CL A SHS F21107101 79,213 79,213 413 0.0015
2019-11-12 2019-09-30 13F CONSTELLIUM CL A N22035104 0 -18,826 -100.00 0 -100.00
2019-08-14 2019-06-30 13F CONSTELLIUM CL A N22035104 18,826 18,826 189 0.0006
2019-02-13 2018-12-31 13F CONSTELLIUM CL A N22035104 0 -180,597 -100.00 0 -100.00
2018-11-08 2018-09-30 13F CONSTELLIUM CL A N22035104 180,597 -9,650 -5.07 2,230 13.78 0.0081
2018-08-03 2018-06-30 13F CONSTELLIUM CL A N22035104 190,247 -2,041 -1.06 1,960 -6.04 0.0067
2018-05-11 2018-03-31 13F CONSTELLIUM CL A N22035104 192,288 -20,164 -9.49 2,086 -11.95 0.0080
2018-02-08 2017-12-31 13F CONSTELLIUM CL A N22035104 212,452 145,818 218.83 2,369 246.85 0.0082
2017-11-06 2017-09-30 13F CONSTELLIUM CL A N22035104 66,634 -200,887 -75.09 683 -63.00 0.0024
2017-07-31 2017-06-30 13F CONSTELLIUM CL A N22035104 267,521 0 0.00 1,846 6.15 0.0074
2017-05-05 2017-03-31 13F CONSTELLIUM CL A N22035104 267,521 -25,000 -8.55 1,739 0.75 0.0076
2017-02-02 2016-12-31 13F CONSTELLIUM CL A N22035104 292,521 -50,623 -14.75 1,726 -30.15 0.0084
2016-11-04 2016-09-30 13F CONSTELLIUM CL A N22035104 343,144 -34,500 -9.14 2,471 39.53 0.0126
2016-08-11 2016-06-30 13F CONSTELLIUM CL A N22035104 377,644 22,905 6.46 1,771 -3.80 0.0106
2016-05-10 2016-03-31 13F/A-1 CONSTELLIUM CL A N22035104 354,739 120,339 51.34 1,841 1.99 0.0115
2016-02-03 2015-12-31 13F CONSTELLIUM CL A N22035104 234,400 234,400 1,805 0.0110
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.