1. 20 Microns Limited
2. Elementis PLC
3. Evonik Industries AG
4. GCR Group
5. Hoffmann Mineral GmbH
6. Imerys S.A.
7. INEOS AG
8. J.M. Huber Corporation
9. LKAB Minerals Ltd.
10. Mineral Technologies Inc.
11. Omya International AG
12. Quarzwerke Gruppe
13. Standridge Color Corporation
14. The Dow Chemical Company
15. Thiele Kaolin Company