| 1 | Cardinal Oil and Gas Holdings, LLC | ||||
| DBA in New Mexico and Texas as: Cardinal Exploration & Production, LLC | |||||
| 2 | Catalyst Midstream Partners, LLC | ||||
| 3 | Delaware Basin Residue, LLC | ||||
| 4 | Oryx Delaware Holdings, LLC | ||||
| 5 | Stateline Crude, LLC - an Oklahoma LLC | ||||
| 6 | Stateline Gathering, LLC - an Oklahoma LLC | ||||
| 7 | Stateline Processing, LLC - an Oklahoma LLC | ||||
| 8 | Stateline Storage, LLC | ||||
| 9 | Stateline Water, LLC - an Oklahoma LLC | ||||
| 10 | WPX Energy Gulf Coast, LP | ||||
| 11 | WPX Energy Holdings, LLC | ||||
| 12 | WPX Energy Keystone, LLC | ||||
| 13 | WPX Energy Marketing, LLC | ||||
| 14 | WPX Energy Mid-Continent Company, an Oklahoma corporation | ||||
| 15 | WPX Energy Permian, LLC | ||||
| 16 | WPX Energy Production, LLC | ||||
| 17 | WPX Energy Services Company, LLC | ||||
| 18 | WPX Energy Williston, LLC (Trade name in North Dakota: D3 E & P LLC) | ||||
| 19 | WPX Energy Williston Nomination A, LLC | ||||
| 20 | WPX Energy Williston Nomination B, LLC | ||||
| 21 | WPX Energy Williston Nomination C, LLC | ||||
| 22 | WPX Energy Williston Nomination D, LLC | ||||
| 23 | WPX Energy Williston Nomination E, LLC | ||||
| 24 | WPX Energy Williston Nomination F, LLC | ||||
| 25 | WPX Energy Williston Nomination G, LLC | ||||
| 26 | WPX Energy Williston Nomination H, LLC | ||||
| 27 | WPX Energy Williston Nomination I, LLC | ||||
| 28 | WPX Energy Williston Nomination J, LLC | ||||
| 29 | WPX Energy Williston Nomination K, LLC | ||||
| 30 | WPX Energy Williston Nomination L, LLC | ||||
| 31 | WPX Energy Williston Nomination M, LLC | ||||
| 32 | WPX Energy Williston Nomination N, LLC | ||||
| 33 | WPX Energy Williston Nomination O, LLC | ||||
| 34 | WPX Energy Williston Nomination P, LLC | ||||
| 35 | WPX Energy Williston Nomination Q, LLC | ||||
| 36 | WPX Energy Williston Nomination R, LLC | ||||
| 37 | WPX Energy Williston Nomination S, LLC | ||||
| 38 | WPX Energy Williston Nomination T, LLC | ||||
| 39 | WPX Permian Midstream Crude Holdings, LLC | ||||
| 40 | WPX Permian Midstream Holdings, LLC | ||||
| 41 | WPX Permian Midstream Residue Holdings, LLC | ||||
| International subsidiaries: | |||||
| 1 | WPX Energy International Oil & Gas (Venezuela), Ltd. – a Cayman Islands corporation | ||||