1. American Geotechnical Inc.
2. Canterbury Seismic Instruments Ltd
3. Deep Excavation LLC
4. Eustis Engineering LLC
5. Fugro N.V.
6. GaiaComm Ltd.
7. GEI Consultants
8. Geocomp Corporation by Sercel S.A.S
9. Geomotion (Singapore) Pte. Ltd.
10. Geotechnical Services Inc.
11. Geotechnics Limited
12. Innovative Geotechnical Instrumentation
13. Keller Group PLC
14. Monitoring Solution Providers Pte Ltd.
15. Nova Metrix LLC
16. Petra Geosciences Inc.
17. PMT Infrascience Pvt. Ltd.
18. Quantum Geotechnic Limited
19. RST Instruments Ltd.
20. S. W. Cole Engineering Inc.
21. Sisgeo S.r.l.
22. Tetra Tech Inc.
23. Trimble Inc.
24. Wardle Drilling & Geotechnical Ltd.
25. WJ Groundwater Limited