WPX Energy, Inc. (WPX Energy) is an independent natural gas and oil exploration and production company engaged in the exploitation and development of long-life unconventional properties. The Company focuses on exploiting its natural gas reserve base and related NGLs in the Piceance Basin of the Rocky Mountain region, and on developing its positions in the Bakken Shale oil play in North Dakota and the Marcellus Shale natural gas play in Pennsylvania. Its other areas of domestic operations include the Powder River Basin in Wyoming and the San Juan Basin in the southwestern United States. In addition, it owns a 69% controlling ownership interest in Apco Oil and Gas International, Inc. (Apco), which holds oil and gas concessions in Argentina and Colombia. As of December 31, 2010, it had proved reserves of 4,473 Bcfe, 59% of which were proved developed reserves. Average daily production as of March 31, 2011 was 1,251 MMcfe/d.