- American Elements
- Buffalo Tungsten Inc.
- CERATIZIT S.A.
- China Tungsten
- CY Carbide Mfg. Co. Ltd.
- Extramet Products
LLC.
- Federal Carbide Company
- Guangdong Xianglu Tungsten Co. Ltd.
- H.C. Stark GmbH
- Jiangxi Yaosheng Tungsten Co. Ltd.
- Kennametal Inc.
- Sandvik AB
- Sumitomo Electric Industries
Ltd.
- Umicore