1. Abitibi Geophysics
2. Cable Detection & Engineering Pte Ltd.
3. CGG SA
4. China Oilfield Services Limited
5. Dawson Geophysical
6. EGS Survey
7. Fugro
8. GeoApplication Engineers Pte Ltd
9. Geophysical Surveys & Consulting Pte. Ltd.
10. GeoTech
11. Halliburton Company
12. IRIS Instruments
13. J.S. Held Company
14. Nuvia Dynamics Inc. by VINCI Group
15. Pacific Geoscience (S) Pte Ltd.
16. PGS ASA
17. Phoenix Geophysics
18. Ramboll Group A/S
19. Ryobi Geotechnique International Pte Ltd
20. SAExploration
21. Schlumberger Limited
22. Sea Geo Surveys Pvt. Ltd.
23. Shearwater Services
24. Soil Investigation Pte Ltd
25. TGS
26. TGS-NOPEC Geophysical Company ASA
27. Weatherford International PLC