| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| COTE JEFFREY J | Director | C/O TRINSEO PLC, 440 EAST SWEDESFORD ROAD, SUITE 301, WAYNE | /s/ Angelo Chaclas, Attorney-in-Fact | 27 Jun 2025 | 0001196701 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | TSE | Ordinary Shares | Tax liability | $38,456 | -10,310 | -18% | $3.73 | 45,699 | 21 Jun 2025 | Direct | F1 |
| holding | TSE | Ordinary Shares | 170,503 | 21 Jun 2025 | By Cote 2019 Irrevocable Indenture Trust | F2, F3 |
| Id | Content |
|---|---|
| F1 | Shares withheld by the Company to pay taxes due following the vesting of previously granted restricted stock units. |
| F2 | This amendment is being filed solely to correct the number of shares indirectly held by the reporting person. |
| F3 | 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"). |