1. Baker Hughes Company
2. BASF SE
3. CES Energy Solutions Corp.
4. Chevron Phillips Chemical Company LLC
5. Core Drilling Chemicals
6. Diamoco Group
7. Elkem ASA
8. Ennor Muds & Chemicals
9. Flotek Industries Inc.
10. Global Drilling Fluids & Chemicals Limited
11. Gumpro Drilling Fluids Pvt. Ltd.
12. Halliburton Company
13. National Oilwell Varco Inc.
14. New Park resources Inc
15. Parchem Fine and Specialty Chemicals Inc.
16. Pon Pure Chemicals Group
17. Q’Max Solutions Inc.
18. Schlumberger Limited
19. Scomi Group Bhd
20. SECURE Energy Services Inc
21. Supreme Drilling Fluid Chemicals
22. TETRA Technologies Inc.
23. Trican Well Service Ltd.
24. Universal Drilling Fluids
25. Weatherford International PLC