Headquartered in Irving, Texas, Pioneer Natural Resources is an independent exploration and production company with operations throughout the southern and central United States. Its focus includes the Permian Basin and Eagle Ford Shale regions of Texas. At year-end 2015, Pioneer's proven reserves were 664 million barrels of oil equivalent, or boe, with net production of 204 mboe per day. Oil and natural gas liquids represented 68% of production and 66% of proven reserves.