| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Greene Roger | VP, GLOBAL CONTROLLER & PAO | C/O TRINSEO PLC, 440 EAST SWEDESFORD ROAD, SUITE 301, WAYNE | /s/ Angelo Chaclas, Attorney-in-Fact | 24 Feb 2026 | 0001994764 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | TSE | Ordinary Shares | Tax liability | $733 | -2,238 | -4.5% | $0.3276 | 47,618 | 21 Feb 2026 | Direct | F1 |
| Id | Content |
|---|---|
| F1 | Shares withheld by the Company to pay taxes due following the vesting of restricted stock units. |