Texas Gas Service Company was founded in Wink, Texas, in 1929 as Southern Union Gas. The company grew to become the third largest natural gas distribution company in Texas. In January 2003 ONEOK purchased these Texas assets and named the distribution company Texas Gas Service Company (TGS). ONEOK Inc. is the parent company of TGS and is located in Tulsa, Oklahoma. ONEOK is a diversified energy company involved in oil and natural gas production, gathering, processing, storage, transmission and marketing in the mid-continent region. In addition, ONEOK's energy, marketing and trading operations provide service to customers in most states..