1. Agile Seismic LLC
2. Alpine Ocean Seismic Survey Inc.
3. Asian Energy Services Ltd
4. CGG S.A.
5. China National Petroleum Corporation
6. Dawson Geophysical Company
7. Dolphin Geo Subsea Pte Ltd
8. Echo Seismic Ltd.
9. Epitome Geo-Technical Services
10. Fairfield Geotechnologies
11. Fugro N.V.
12. Geo Marine Survey Systems
13. Geospace Technologies Corporation
14. MIND Technolgy Inc.
15. New Resolution Geophysics
16. Park Seismic LLC
17. PGS ASA
18. Polarcus Limited
19. Pulse Seismic Inc.
20. PXGEO
21. SAExploration Holdings Inc.
22. Schlumberger Limited
23. SeaBird Exploration Group
24. Searcher Seismic
25. South West Pinnacle Exploration Limited.
26. STRYDE LTD.
27. TGS-NOPEC Geophysical Company ASA
28. Wintershall Dea AG by BASF SE