Chaclas Angelo N. 4

What Happened
Angelo N. Chaclas, SVP, Chief Legal Officer, Chief Compliance Officer and Corporate Secretary of Trinseo PLC, had a total of 10,788 shares withheld by the company to cover taxes following the vesting of restricted stock units. The withholding occurred in two events: 3,690 shares on 2026-02-21 and 7,098 shares on 2026-02-22, at $0.33 per share. Reported values on the Form 4 are $1,209 (2/21) and $2,325 (2/22), totaling $3,534. These were tax-withholding disposals (code F), not open-market sales.

Key Details

• Transaction dates and amounts:
  • 2026-02-21: 3,690 shares withheld @ $0.33 — reported value $1,209 (code F)
  • 2026-02-22: 7,098 shares withheld @ $0.33 — reported value $2,325 (code F)
• Total shares withheld: 10,788; combined reported value: $3,534.
• Footnote (F1): Shares were withheld by the company to pay taxes due following RSU vesting.
• Filing: Form 4 filed 2026-02-24 reporting the 2/21 and 2/22 transactions — no indication of a late filing in the supplied data.
• Shares owned after the transactions: not disclosed in the provided excerpt.

Context
Tax-withholding by the company following RSU vesting is a routine, administrative disposal (often called a cashless or share-withholding settlement) and does not represent an open-market sale or necessarily indicate the insider’s view on the stock. Transaction code F identifies these as shares retained to cover tax liabilities rather than purchases or discretionary sales.