Pioneer Natural Resources Co. Operates as an independent oil and gas exploration and production company. The firm engages in hydrocarbon exploration in the Cline Shale. It focuses in the operation of Permian Basin, Eagle Ford Shale, Rockies, and West Panhandle projects. The firm also maintains an office in Midland, Texas and field offices in its area of operation. The company was founded in August 1997 and is headquartered in Irving, TX.