1. Andmir Group
2. Anton Oilfield Services Group
3. Baker Hughes Company
4. Carbo Ceramics Inc.
5. China Oilfield Services
6. Eaton Drilling Co LLC
7. Halliburton
8. Halliburton Energy Services Inc.
9. Mitchell Industries
10. Oil States International Inc.
11. Sazoil
12. Schlumberger Ltd.
13. Shenzhen Max-well Oilfield Services Ltd.
14. Si?o Petr?leo S.A
15. Superior Energy Services
16. Tendeka
17. Variperm Energy Services
18. Weatherford International PLC
19. Zamam Offshore Services Limited