Range Resources Corporation operates as an independent natural gas, natural gas liquids (NGLs), and oil company. It engages in the acquisition, exploration, and development of natural gas and oil properties primarily in the Appalachian and southwestern regions of the United States. The company drills and produces shale tight gas, coal bed methane, conventional natural gas, natural gas liquids, and oil in Pennsylvania, Virginia, and West Virginia of the Appalachian region. It owns 5,051 net producing wells; approximately 3,400 miles of transportation and gas gathering lines; and 1.8 million gross acres under lease. The company’s drilling and producing activities in the southwestern United States cover the Permian Basin of West Texas, the Delaware Basin of New Mexico, the East Texas Basin, the Texas Panhandle, the Anadarko Basin of western Oklahoma, the Ardmore Basin of southern Oklahoma, the Nemaha Uplift of northern Oklahoma, and Kansas and Mississippi. It owns 1,636 net producing wells, as well as approximately 890,000 gross acres under lease. As of December 31, 2011, Range Resources Corporation had 5.1 Tcfe of proved reserves. It sells gas to utilities, marketing companies, mid stream companies, and industrial users; and natural gas liquids to natural gas processors and other purchasers or users of NGLs. The company was formerly known as Lomak Petroleum, Inc. and changed its name to Range Resources Corporation in 1998. Range Resources Corporation was founded in 1975 and is headquartered in Fort Worth, Texas.