1. AGSCO Corporation
2. Blue Mountain Minerals
3. Calcinor Servicios S.A.
4. Carmeuse Coordination Center SA
5. Chemical & Mineral Industries Pvt. Ltd
6. GCCP Resources Limited
7. GLC Minerals
8. Greer Limestone Co.
9. Gulshan Polyols Ltd.
10. Imerys S.A.
11. Iowa Limestone Company
12. J.M. Huber Corporation
13. Kemipex Group
14. Lhoist Group
15. Maruo Calcium Co. Ltd.
16. Merck KGaA
17. Minerals Technologies Inc.
18. Mississippi Lime Company
19. National Lime & Stone
20. Newpark Resources Inc.
21. Okutama Industry Co. Ltd.
22. Omya AG
23. Provale Holding S/A
24. SCR-Sibelco NV
25. Shiraishi Kogyo Kaisha
Ltd.
26. Spectrum Chemical Mfg. Corp.
27. United States Lime & Minerals Inc.
28. US Aggregates
29. Vizag Chemical