- Energy Capital Partners
- Albemarle Corporation
- Cabot Corporation
- Calgon Carbon Corporation
- Carbon Activated Corporation
- CPL Activated Carbons
- Donau Chemie AG
- Evoqua Water Technologies LLC
- HAYCARB (PVT) LTD.
- Ingevity
- JACOBI CARBONS GROUP
- Kuraray Co. Ltd
- KUREHA CORPORATION
- Puragen Activated Carbons
- Prominent Systems Inc.
- Silcarbon Aktivkohle GmbH
- Veolia