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 (NGL) 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 (ONG), 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. Instead, Oneok bought a new Cities Service Company building still under construction (later renamed Citgo) in August, 1982. The Cities Service Company, undergoing financial difficulties, already had a project underway to build a high-rise headquarters building at Fifth and Boulder. Oneok realized that it would be more economical to cap the planned structure at 17 stories and move its headquarters there, rather than to proceed with its original plan. It completed the new black granite and glass tower in 1984. In 2009, Oneok sponsored the construction of Oneok Field, the new Tulsa Drillers minor league baseball stadium in downtown Tulsa. History Oklahoma Natural Gas Company (ONG) was founded in 1906 by two attorneys, Dennis T. Flynn and Charles B. Ames, who planned to develop the natural gas that was a byproduct of the northern Oklahoma oilfields. ONG incorporated on October 9, 1906, under the laws of Oklahoma Territory. Flynn was president and Ames the secretary. Joined by Chicago entrepreneur, H. M. Byllesby, for whom they worked, they also formed the Oklahoma Gas and Electric Company (OG&E) to bring natural gas from the Cleveland Oil Field to Oklahoma City, using it to generate electric power. Byllesby soon resigned, but Glenn T. Braden and Theodore N. Barnsdall joined ONG. Both were already experienced oilmen. Together, they owned the Osage