| Symbol | Name | Country | Exchange |
|---|---|---|---|
| VTDRF | Vantage Drilling International | US | OTC |
| VTGDF | Vantage Drilling Company | US | OTC |
| W1T | WESTERN ENERGY SRV. NEW | DE | F |
| WBRE | Wild Brush Energy Inc | US | US |
| WEEED | Western Energy Svc | US | OTC |
| WEEEF | Western Energy Svc | US | OTC |
| WRG | Western Energy Services Corp. | CA | TO |
| YIZH | Sinopec Oilfield Service Corporation | DE | F |
| YZCFF | Sinopec Oilfield Service Corporation | US | OTC |