| Symbol | Name | Country | Exchange |
|---|---|---|---|
| DRIL | Drillcon AB | SE | ST |
| PUD | Pulse Seismic Inc | DE | F |
| TGC | TGS ASA | DE | F |
| TGC0 | TGS ASA SP.ADR/1 | DE | F |
| YIZH | Sinopec Oilfield Service Corporation | DE | F |
| PSD | Pulse Seismic Inc | CA | TO |
| AXE | Acceleware Ltd | CA | V |
| VIRI | Viridien | FR | PA |
| ALPHAGEO | Alphageo (India) Limited | IN | NSE |
| 0MSJ | TGS NOPEC Geophysical Company ASA | GB | LSE |
| 0RI9 | CGG SA | GB | LSE |
| DUG | Dug Technology Ltd | AU | AU |