Oneok, Inc. is an American diversified corporation focused primarily on the natural gas industry, and headquartered in Tulsa, Oklahoma. The company is part of the Fortune 500 and S&P 500. Oneok was founded in 1906 as Oklahoma Natural Gas Company, but it changed its corporate name to Oneok in December 1980. It also owns major natural gas liquids systems due to the 2005 acquisition of Koch Industries natural gas businesses. Oneok's Energy Services operation focuses primarily on marketing natural gas and related services throughout the U.S. Energy Services, which derives more than 84 percent of its earnings from the physical marketing business, showed an operating income increase of $26.5 million. Energy Services’ retail business participates in customer gas choice program in Nebraska and Wyoming. Oneok's predecessor, Oklahoma Natural Gas Company, had been headquartered in an Art Deco building on the northwest corner of Seventh Street and Boston Avenue in Tulsa since 1928. In 1982, Oneok chairman, J. E. Tyree, announced plans to demolish the ONG building and replace it with a new 16-story tower. However, this did not happen. Wikipedia