1. Adinath Industries
2. Adwan Chemical Industries Co. Ltd.
3. AGSCO Corporation
4. Astrra Chemicals
5. Australian Silica Quartz Group Ltd.
6. BMS Factories
7. Elkem AS
8. Fineton Industrial Minerals Limited
9. Gulf Minerals & Chemicals LLC
10. Hoben International Limited by Goodwin PLC
11. Karnataka Silicates
12. Knouz
13. MS Industries II
LLC
14. Pan Abrasives
15. Quarzwerke GmbH
16. Sai Baba Minerals
17. Sibelco Group
18. Sil Industrial Minerals
19. Soilmoisture Equipment Corp.
20. Steelcon Industries
21. Suez Company for Minerals
22. Tanvi Mines & Minerals
23. Tasmanian Advanced Minerals
24. Terengganu Silica Consortium Sdn. Bhd.
25. U.S. Silica Holdings Inc.