Klynne Johnson - 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, 17:01:27 UTC
Prior SEC filing: 30 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ Angelo Chaclas, Attorney-in-Fact

Key filing fact

Klynne Johnson filed Form 4 for Trinseo PLC (TSEOF) on 14 May 2026.

Key facts

This page summarizes Klynne Johnson's Form 4 filing for Trinseo PLC (TSEOF).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 14 May 2026, 17:01.

Change

Previous filing in this sequence was filed on 30 Apr 2026.
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 0001532447 Primary reporting owner

Johnson KLynne

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 %: -47%
Price
Shares after: 48,429
Date: 12 May 2026
Ownership: Direct
Footnotes: F1

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

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.