sentences:  XTO Energy owns interests in approximately 40,000 active oil and natural gas sites across North America, with locations in Arkansas, Colorado, Kansas, Louisiana, Montana, New Mexico, North Dakota, Ohio, Oklahoma, Pennsylvania, Texas, Utah, West Virginia, Wyoming and Western Canada.XTO Energy was founded in 1986, and was initially called Cross Timbers Oil Company.The company was started by Bob R. Simpson, Steve Palko and Jon Brumley with US$35 million raised by former Goldman Sachs co-chairman Robert Rubin.