1. Archer Limited
2. Baker Hughes Company
3. Basic Energy Services Inc.
4. China Oilfield Services Limited
5. Expro Group
6. Halliburton Company
7. Nabors Industries
Ltd.
8. National Oilwell Varco Inc.
9. Pioneer Energy Inc.
10. Schlumberger Limited
11. Superior Energy Services
12. TechnipFMC Plc
13. Trican Well Service
Ltd.
14. Weatherford International
Plc
15. Welltec A/S