Guo Jack Q. 4

What Happened

• Jack Q. Guo, Executive Vice President & Chief Financial Officer of Constellium SE (CSTM), had 75,874 performance stock units vest on March 9, 2026 (recorded as an award). On March 10, 2026 he sold 41,717 ordinary shares in an open-market transaction at $25.87 per share, generating proceeds of $1,079,219. The sale was executed to satisfy tax withholding obligations incurred upon vesting.

Key Details

• Transactions:
  • 2026-03-09: Award (A) — 75,874 shares acquired at $0.00 (vested PSUs).
  • 2026-03-10: Sale (S) — 41,717 shares sold at $25.87, proceeds $1,079,219.
• Origin of award: These were performance stock units granted March 9, 2023 that vested March 9, 2026 (see footnote F1).
• Reason for sale: Reporting person sold shares solely to satisfy tax withholding upon vesting (footnote F2).
• Filing details: Form 4 filed March 11, 2026 (reporting period March 9, 2026). Filing appears timely (filed within normal Form 4 reporting window).
• Shares owned after transaction: Not disclosed in the provided filing data.

Context

• Performance stock units (PSUs) are awards that convert to shares if performance/vesting conditions are met; here the PSU award vested, producing the 75,874 shares. The partial sale to cover taxes is a routine administrative action and does not necessarily indicate the insider's view on the company's stock. Purchases generally carry more informational weight than routine withholding sales.