| Symbol | Name | Country | Exchange |
|---|---|---|---|
| DWSN | Dawson Geophysical Company | US | NASDAQ |
| GEOS | Geospace Technologies Corporation | US | NASDAQ |
| MIND | Mitcham Industries, Inc. | US | NASDAQ |
| MINDP | Mitcham Industries, Inc. - Series A 9.00% Series A Cumulative Preferred Stock | US | NASDAQ |
| GGX | Gas2Grid Limited | AU | ASX |
| CGGYY | CGG | US | OTC |
| CGPVF | CGG | US | OTC |
| FSEI | First Seismic Corp | US | OTC |
| PGEJF | Petroleum Geo Svcs | US | OTC |
| TXLZF | Tesla Expl Ltd | US | OTC |
| PSD | Pulse Seismic Inc. | CA | TSX |
| 526397 | Alphageo (India) Limited | IN | BSE |
| GDGE | CGG SA | DE | F |