- Nouryon
- Albemarle Corporation
- Ashland
- Baker Hughes Company
- BASF SE
- CES Energy Solutions Corp.
- Clariant
- Croda International Plc
- Chevron Phillips Chemical Company (Drilling Specialties Company)
- Dow
- ELEMENTIS PLC
- Flotek Industries Inc.
- Halliburton
- Huntsman International LLC
- Innospec Oilfield Services
- Kemira
- Ecolab (NALCO Champion)
- Schlumberger Limited
- MPRC
- Solvay
- The Lubrizol Corporation
- Zirax Limited