ONEOK, Inc. is a diversified Fortune 500 corporation based in Tulsa, Oklahoma. 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. On December 22, 2005, The ONEOK Foundation said it would donate $1 million this winter to assist residents in Oklahoma, Kansas and Texas with their energy bills. In 2007, Fortune magazine named ONEOK the most admired company in the energy industry.