Jack Q. Guo - 09 Mar 2026 Form 4 Insider Report for CONSTELLIUM SE (CSTM)

Role
EVP & CFO
Signature
/s/ Kristine Carpenter, Attorney-in-Fact for Jack Guo
Issuer symbol
CSTM
Transactions as of
09 Mar 2026
Net transactions value
-$1,079,219
Form type
4
Filing time
11 Mar 2026, 06:33:22 UTC
Previous filing
11 Mar 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Guo Jack Q. EVP & CFO 300 EAST LOMBARD STREET, SUITE 1710, BALTIMORE /s/ Kristine Carpenter, Attorney-in-Fact for Jack Guo 11 Mar 2026 0002095182

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction CSTM Ordinary shares Award +75,874 +48% $0.000000* 232,596 09 Mar 2026 Direct F1
transaction CSTM Ordinary shares Sale $1,079,219 -41,717 -18% $25.87 190,879 10 Mar 2026 Direct F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Represents earned non-derivative performance stock units of Constellium SE (the "Issuer") granted on March 9, 2023 that contained performance-vesting requirements, which vested on March 9, 2026.
F2 The Reporting Person sold 41,717 ordinary shares of the Issuer upon the vesting of restricted stock unit and performance stock unit awards previously granted on March 9, 2023, solely to satisfy tax withholding obligations incurred upon vesting.