1. Archer Limited
2. Atlas Copco AB
3. Baker Hughes Company
4. Bostech Drilling Australia Pty. Ltd.
5. Brown Bros (NZ) Ltd
6. DAL Group
7. Drillwest Western Austrialia
8. Geodrill Limited
9. Harlsan Industries
10. Master Drilling Group Limited
11. Perenti Limited
12. Ranger Exploration Drilling Pty Ltd.
13. Resource Base Limited
14. Schlumberger Limited
15. Wallis Drilling Pty. Ltd.
16. Weatherford International PLC