Johanna Frisch - 30 Sep 2025 Form 4 Insider Report for Trinseo PLC (TSE)

Signature
/s/ Angelo Chaclas, Attorney-in-Fact
Issuer symbol
TSE
Transactions as of
30 Sep 2025
Net transactions value
-$5,156
Form type
4
Filing time
02 Oct 2025, 16:05:15 UTC
Previous filing
14 Mar 2025

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Frisch Johanna VP AND TREASURER C/O TRINSEO PLC, 440 EAST SWEDESFORD ROAD, SUITE 301, WAYNE /s/ Angelo Chaclas, Attorney-in-Fact 02 Oct 2025 0001904241

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction TSE Ordinary Shares Tax liability $5,156 -2,194 -12% $2.35 15,898 30 Sep 2025 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Johanna Frisch is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may continue.

Explanation of Responses:

Id Content
F1 Shares withheld by the Company to pay taxes due following the vesting of previously granted restricted stock units.