| Symbol | Name | Country | Exchange |
|---|---|---|---|
| W1T | WESTERN ENERGY SRV. NEW | DE | F |
| WEEEF | Western Energy Svc | US | OTC |
| WFTSF | Wavefront Tech Solut | US | OTC |
| WG | John Wood Group PLC | UK | LSE |
| WHD | Cactus, Inc. | US | NYSE |
| WINS | Wintermar Offshore Marine Tbk | ID | JK |
| WOR | Worleyparsons Limited | AU | ASX |
| WTTR | Select Energy Services, Inc. | US | NYSE |
| Y9R | ASHTEAD TECHNOLOGY LS-05 | DE | F |
| YRM | Rosetti Marino SpA | IT | MI |