Exhibit 21.1
SUBSIDIARIES OF TRINSEO PLC
AS OF DECEMBER 31, 2024
Entity Name | Jurisdiction |
1. Trinseo Belgium B.V. | Belgium |
2. Trinseo Operating Belgium B.V. | Belgium |
3. Trinseo Canada ULC | Canada |
4. Styron Synthetic Materials (Shanghai) Company Limited | China |
5. Trinseo Polymers (Zhangjiagang) Company Limited | China |
6. Altuglas International Denmark A/S | Denmark |
7. Trinseo Suomi Oy | Finland |
8. Altuglas International SAS | France |
9. Trinseo France S.A.S. | France |
10. Trinseo Deutschland Anlagengesellschaft mbH | Germany |
11. Trinseo Deutschland GmbH | Germany |
12. Trinseo Deutschland RE GmbH & Co. KG | Germany |
13. Trinseo Deutschland RE GP GmbH | Germany |
14. Trinseo (Hong Kong) Limited | Hong Kong |
15. Trinseo Materials (Hong Kong) Limited | Hong Kong |
16. Trinseo India Trading Private Limited | India |
17. PT Trinseo Materials Indonesia | Indonesia |
18. PT Trinseo Operating Indonesia | Indonesia |
19. Trinseo Finance Ireland Unlimited Company | Ireland |
20. Trinseo Ireland Global IHB Limited | Ireland |
21. Trinseo Ireland Holdings Limited | Ireland |
22. Trinseo Services Ireland Limited | Ireland |
23. A.P.I. Applicazioni Plastiche Industriali S.p.A. | Italy |
24. Altuglas S.r.l. | Italy |
25. Trinseo Italia S.R.L. | Italy |
26. Trinseo Japan Y.K. | Japan |
27. Trinseo Korea Ltd. | Korea |
28. Trinseo Holding S.à r.l. | Luxembourg |
29. Trinseo Luxco S.à r.l. | Luxembourg |
30. Trinseo Luxco Finance SPV S.à r.l. | Luxembourg |
31. Altuglas Mexico, S.A. de C.V. | Mexico |
32. Trinseo de México S. de R.L. de C.V. | Mexico |
33. Heathland B.V. | The Netherlands |
34. Styron Netherlands Holding Company B.V. | The Netherlands |
35. Trinseo Holding B.V. | The Netherlands |
36. Trinseo Netherlands B.V. | The Netherlands |
37. Styron Poland sp. z.o.o. | Poland |
38. Trinseo Holdings Asia Pte. Ltd. | Singapore |
39. Trinseo Singapore Pte. Ltd. | Singapore |
40. Trinseo Sverige AB | Sweden |
41. Trinseo Europe GmbH | Switzerland |
42. Trinseo Export GmbH | Switzerland |
43. Taiwan Trinseo Limited | Taiwan |
44. Trinseo Kimya Ticaret Limited Şirketi | Turkey |
45. Trinseo UK Limited | England and Wales |
46. Altuglas LLC | USA – Delaware |
47. Americas Styrenics LLC1 | USA – Delaware |
48. Trinseo LLC | USA – Delaware |
49. Trinseo Materials Finance, Inc. | USA – Delaware |
50. Trinseo NA Finance LLC | USA – Delaware |
51. Trinseo NA Finance SPV LLC | USA – Delaware |
52. Trinseo U.S. Holding, Inc. | USA – Delaware |
53. Trinseo U.S. Receivables Company SPV LLC | USA – Delaware |
54. Aristech Surfaces LLC | USA – Kentucky |
1 Represents a joint venture company of which the registrant indirectly owns 50% of the voting equity.