| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Cooney Paula M. | SVP, CHRO | C/O TRINSEO PLC, 440 EAST SWEDESFORD ROAD, SUITE 301, WAYNE | /s/ Angelo Chaclas, Attorney-in-Fact | 03 Mar 2026 | 0001670565 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | TSE | Ordinary Shares | Tax liability | $1,764 | -7,670 | -6.1% | $0.2300 | 118,318 | 27 Feb 2026 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | Shares withheld by the Company to pay taxes due following the vesting of restricted stock units. |