Desmond Jeanmarie F. 4

What Happened
Desmond Jeanmarie, a director of Trinseo PLC (TSE), recorded a disposition on 2026-05-12 for 42,484 shares. The Form 4 lists the transaction as "Other acquisition or disposition (J)" with price N/A. A footnote clarifies this was a voluntary forfeiture of restricted stock units (RSUs) granted June 25, 2025; the award was unvested and was not settled, in whole or in part. This was a forfeiture/cancellation of an award, not an open-market sale.

Key Details

• Transaction date: 2026-05-12; Form 4 filed 2026-05-14 (two days later).
• Transaction code: J — "Other acquisition or disposition" (footnote F1: voluntary forfeiture of unvested RSUs).
• Shares impacted: 42,484 RSUs forfeited.
• Price / proceeds: N/A — no sale proceeds reported.
• Shares owned after transaction: not disclosed in the provided filing excerpt.
• Filing timeliness: Form filed two days after the reported transaction date (appears within the usual 2-business-day Form 4 window).

Context
Forfeiture of unvested RSUs cancels future share delivery tied to an award; it is an administrative/corporate compensation event rather than a cash sale by the insider. Such forfeitures generally do not signal a buying or selling preference in the market and produce no proceeds for the insider, so they offer limited insight into insider sentiment.