BOZICH FRANK A 4

What Happened
Frank A. Bozich, Trinseo PLC’s CEO, President and a director, had 23,680 shares withheld by the company on Feb 27, 2026 to cover taxes related to the vesting of restricted stock units. The filing reports the shares were disposed at $0.23 per share for a reported value of $5,446. This was a tax-withholding disposition, not an open-market sale or new purchase.

Key Details

• Transaction date: 2026-02-27; reported on Form 4 filed 2026-03-03 (filed on time).
• Price reported: $0.23 per share; total reported value: $5,446.
• Shares involved: 23,680 withheld (reported as a disposition, transaction code F).
• Shares owned after the transaction: not specified in the provided filing excerpt.
• Footnote: F1 — "Shares withheld by the Company to pay taxes due following the vesting of restricted stock units."

Context
This was a routine withholding to satisfy tax obligations upon RSU vesting (a common, administrative disposition). Such withholdings are not the same as an insider selling shares on the open market and generally do not signal a change in the insider’s view of the company. Purchases or open-market sales typically carry more informational weight for investors than tax-withholding transactions.