| VNG AG | Germany |
Private
|
| Volga Gas plc | United Kingdom |
Private
|
| VTEX Energy Inc | United States |
Private
|
| Vulcan Energy Corp | United States |
Private
|
| W-H Energy Services, Inc. | United States |
Private
|
| Wales & West Utilities Finance PLC | United Kingdom |
Private
|
| Wales & West Utilities Limited | United Kingdom |
Private
|
| Warren Resources, Inc. | United States |
Private
|
| Weatherford Enterra, Inc. | United States |
Private
|
| Weatherford International, LLC | United States |
Private
|
| Welton Energy Corporation | Canada |
Private
|
| West Energy Ltd | Canada |
Private
|
| Westbow Energy Inc | Canada |
Private
|
| Western Canada Energy Ltd. | Canada |
Private
|
| WesternZagros Resources Ltd. | Canada |
Private
|
| Westport Resources Corporation | United States |
Private
|
| Westside Corporation Ltd | Australia |
Private
|
| Whiting Canadian Holding Co ULC | United States |
Private
|
| Whiting Oil and Gas Corporation | United States |
Private
|
| Wild Stream Exploration, Inc | Canada |
Private
|
| WildHorse Resources, LLC | United States |
Private
|
| Williams Pipeline Partners LP | United States |
Private
|
| Williston Hunter Canada Inc | Canada |
Private
|
| Wilrig A.S. | Norway |
Private
|
| Winalta Inc. | Canada |
Private
|
| Winstar Resources Limited | Canada |
Private
|
| Wintershall Dea AG | Germany |
Private
|
| Wintershall Dea Global Holding GmbH | Germany |
Private
|
| Wintershall Dea International GmbH | Germany |
Private
|
| Wintershall Dea Norge AS | Norway |
Private
|
| Wisconsin Natural Gas Company | United States |
Private
|
| Woburn Energy PLC | United Kingdom |
Private
|
| Woodside Finance Limited | Australia |
Private
|
| Worldwide Resources Corp. | Canada |
Private
|
| WPX Energy Permian LLC | United States |
Private
|
| Wynnewood Refining Company | United States |
Private
|
| XBN LIMITED | United Kingdom |
Private
|
| XCD ENERGY PTY LTD | Australia |
Private
|
| Xtreme Drilling Corp | Canada |
Private
|
| Xun Energy, Inc | United States |
Private
|
| XZERES Corp. | United States |
Private
|
| Yinggao Holdings PLC | United Kingdom |
Private
|
| Yinson Production AS | Norway |
Private
|
| Yoho Resources Inc. | Canada |
Private
|
| Z Energy Limited | New Zealand |
Private
|
| ZAAB Energy AG | Germany |
Private
|
| Zeeland Refinery N.V. | Netherlands |
Private
|
| Zenas Energy Corp. | Canada |
Private
|
| ZETA Petroleum plc | United Kingdom |
Private
|
| Zhaikmunai Finance B.V. | Netherlands |
Private
|
| Zhaikmunai International B.V. | Netherlands |
Private
|
| Zhongxing Tianheng Energy Technology Beijing Co Ltd | China |
Private
|
| Zyrox Mining International, Inc. | United States |
Private
|
|
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