1. Avient Corporation
2. Borealis AG
3. Braskem
4. Chevron Phillips Chemical Company LLC
5. Ducor Petrochemicals B.V.
6. ExxonMobil Corporation
7. Formosa Plastics Corporation
8. LyondellBasell Industries Holdings B.V.
9. Mitsubishi Chemical Corporation
10. Repsol Group
11. Sasol Limited
12. Sinopec Catalyst CO. LTD.
13. SK Functional Polymer Company
14. The Dow Chemical Company
15. W. R. Grace & Co.