Jeffrey J. Cote - 12 May 2026 Form 4 Insider Report for Trinseo PLC (TSEOF)

Reporting relationship: Director
Issuer ticker: TSEOF
Reported as of: 12 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 14 May 2026, 17:05:18 UTC
Prior SEC filing: 27 Jun 2025
Source filing: View source filing
Reporting owner signature: /s/ Angelo Chaclas, Attorney-in-Fact

Key filing fact

Jeffrey J. Cote filed Form 4 for Trinseo PLC (TSEOF) on 14 May 2026.

Key facts

This page summarizes Jeffrey J. Cote's Form 4 filing for Trinseo PLC (TSEOF).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 14 May 2026, 17:05.

Change

Previous filing in this sequence was filed on 27 Jun 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001196701 Primary reporting owner

COTE JEFFREY J

Relationship: Director
Address: C/O TRINSEO PLC, 440 EAST SWEDESFORD ROAD, SUITE 301, WAYNE
Signature: /s/ Angelo Chaclas, Attorney-in-Fact
Signature date: 14 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

TSEOF transaction

Ordinary Shares

Other

Transaction value
Shares: -42,484
Change %: -48%
Price
Shares after: 45,699
Date: 12 May 2026
Ownership: Direct
Footnotes: F1

TSEOF holding

Ordinary Shares

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 170,503
Date: 12 May 2026
Ownership: By Cote 2019 Irrevocable Indenture Trust
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Reflects a voluntary forfeiture by the Reporting Person of restricted stock units ("RSUs") that were previously granted on June 25, 2025. At the time of forfeiture, the RSU award was not vested or settled, in full or in part.

Footnote F2

Represents shares held by an irrevocable indenture trust having a disinterested trustee for the benefit of the reporting person and children (the "Cote 2019 Irrevocable Indenture Trust").