Sonerra Resources Corporation, 422 E Hospital St, Nacogdoches, TX 75961, US

With a location in Tyler, Texas, XTO Energy is an independent domestic producer engaged in the acquisition, exploitation and of high quality, long-lived producing natural gas and oil properties. The company's reserves have grown since 1993, making it one of the largest owners of domestic natural gas reserves among the independents. Its low-risk inventory of more than 11.3 Tcfe should provide steady production and reserve growth for years. Given its low cost structure and strong producing margins, XTO is consistently a leader in realizing top economic returns for its shareholders. Its properties are concentrated in Texas, New Mexico, Arkansas, Oklahoma, Kansas, Wyoming, Colorado, Alaska, Utah, Louisiana, Mississippi, Montana, North Dakota, Pennsylvania, New York, West Virginia and Kentucky.