Stasse David Phillip 4

What Happened
David Phillip Stasse, Executive Vice President and Chief Financial Officer of Trinseo PLC, had a total of 14,699 shares disposed of via company withholding to satisfy tax obligations following the vesting of restricted stock units. The transactions were reported as: 5,028 shares at $0.33 on 2026-02-21 (reported value $1,647) and 9,671 shares at $0.33 on 2026-02-22 (reported value $3,168), for a combined reported value of $4,815. This was a withholding-for-taxes event (routine administrative disposition), not an open-market sale decision by the insider.

Key Details

• Transaction dates and prices:
  • 2026-02-21: 5,028 shares @ $0.33 (reported $1,647)
  • 2026-02-22: 9,671 shares @ $0.33 (reported $3,168)
• Total shares disposed: 14,699; total reported value: $4,815
• Shares owned after transaction: not disclosed in this filing
• Footnote: F1 — shares were withheld by the company to pay taxes due following vesting of previously granted restricted stock units
• Filing: Form 4 filed 2026-02-24 covering the Feb 21–22 transactions (filing does not indicate a late filing)

Context: The "F" transaction code indicates tax withholding on vested RSUs — a routine administrative action that reduces an insider’s share count to satisfy tax liabilities. These transactions generally do not signal the same trading intent as an open-market sale by the insider.