| 1 | Cardinal Oil and Gas Holdings, LLC | ||||
| DBA in New Mexico and Texas as: Cardinal Exploration & Production, LLC | |||||
| 2 | Catalyst Midstream Partners, LLC | ||||
| 3 | Oryx Delaware Holdings, LLC | ||||
| 4 | Stateline Crude, LLC - an Oklahoma LLC | ||||
| 5 | Stateline Gathering, LLC - an Oklahoma LLC | ||||
| 6 | Stateline Marketing, LLC | ||||
| 7 | Stateline Processing, LLC - an Oklahoma LLC | ||||
| 8 | Stateline Storage, LLC | ||||
| 9 | Stateline Water, LLC - an Oklahoma LLC | ||||
| 10 | Twin Buttes Gathering LLC | ||||
| 11 | WPX Energy Gulf Coast, LP | ||||
| 12 | WPX Energy Headquarters, LLC | ||||
| 13 | WPX Energy Holdings, LLC | ||||
| 14 | WPX Energy Keystone, LLC | ||||
| 15 | WPX Energy Marketing, LLC | ||||
| 16 | WPX Energy Mid-Continent Company, an Oklahoma corporation | ||||
| 17 | WPX Energy Mineral Partners, LP | ||||
| 18 | WPX Energy Mineral Holdings GP, LLC | ||||
| 19 | WPX Energy Mineral Holdings LP, LLC | ||||
| 20 | WPX Energy Non-Op Partners, LP | ||||
| 21 | WPX Energy Non-Op Holdings GP, LLC | ||||
| 22 | WPX Energy Non-Op Holdings LP, LLC | ||||
| 23 | WPX Energy Permian, LLC | ||||
| 24 | WPX Energy Production, LLC | ||||
| 25 | WPX Energy Services Company, LLC | ||||
| 26 | WPX Energy Williston, LLC (Trade name in North Dakota: D3 E & P LLC) | ||||
| 27 | WPX Permian Midstream Crude Holdings, LLC | ||||
| 28 | WPX Permian Midstream Holdings, LLC | ||||
| 29 | WPX Permian Midstream Residue Holdings, LLC | ||||
| 30 | WPX Permian Surface Holdings, LLC | ||||
| International subsidiaries: | |||||
| 1 | WPX Energy International Oil & Gas (Venezuela), Ltd. – a Cayman Islands corporation | ||||