1. Baker Hughes Company
2. Cougar Drilling Solutions
3. CS Unitec Inc.
4. Derrick Equipment Company
5. Drill Service Horley Limited
6. Drilling Tools International
7. Halliburton Energy Services Inc.
8. Hunting PLC
9. National Oilwell Varco Inc.
10. NOV Inc.
11. Rival Downhole Tools
12. Schlumberger Limited
13. Tapco Cutting Tools Inc.
14. United Drilling Tools Limited
15. Weatherock Group Holding Limited