1. 3M Company
2. AHP Materials Inc.
3. AIM Metals & Alloys LP
4. American Elements Corp
5. Avalon Advanced Materials Inc.
6. Denko Corporation
7. DOWA Electronics Materials Co. Ltd.
8. ESPI Metals Inc.
9. GreenNovo Environmental Technology Co. Ltd
10. Guangxi China Tin Group Co. Ltd
11. Henan Yuguang Gold and Lead Group Co. Ltd.
12. Indium Corporation
13. Keeling & Walker Ltd.
14. Korea Zinc Co. Ltd
15. Lipmann Walton & Co Ltd
16. Nippon Rare Metal Inc.
17. Nitto Denko Corporation
18. Nyrstar N.V.
19. PPM Pure Metals GmbH
20. ProTech materials Inc.
21. Recylex Group
22. Teck Resources Limited
23. Touch International Inc.
24. Umicore N.V.
25. Young Poong Corporation
26. Zhuzhou Keneng New Material Co. Ltd. Inc.