1. Aether Catalyst Solutions Inc.
2. AP Emissions Technologies
3. BASF SE
4. Cataler Corporation
5. CDTi Advanced Materials Inc.
6. Clariant AG
7. Cummins Inc.
8. Eberspcher Group
9. Ecocat India Pvt. Ltd. by Vikas Group company,
10. Evonik Industries AG
11. Gannon & Scott
12. GCL Geri Kazan?m ve Rafineri A.?.
13. Heraeus Holding
14. Jetex Exhausts Ltd.
15. Johnson Matthey Inc.
16. Klarius Products Ltd.
17. MAIREC Edelmetallgesellschaft mbH
18. Malvern Panalytical Ltd.
19. Pyrochem Catalyst Company
20. SGS S.A.
21. Sumitomo Metal Mining Co. Ltd.
22. Tenneco Inc.
23. Umicore N.V.
24. Unifrax I LLC
25. W. R. Grace and Co. by Standard Industries
26. Yutaka Giken Company