EX-21 9 dex21.txt SUBSIDIARIES OF THE COMPANY Exhibit 21 SUBSIDIARIES OF THE COMPANY State of Incorporation Subsidiary or Organization ---------- --------------- Mid Continent Market Center, Inc. ........................................Kansas Market Center Gathering, Inc. ............................................Kansas Mid Continent Transportation, Inc. .....................................Delaware ONEOK Sayre Storage Company ............................................Delaware OkTex Pipeline Company .................................................Delaware ONEOK Gas Transportation, L.L.C. .......................................Oklahoma ONEOK Gas Storage Holdings, Inc. .......................................Delaware ONEOK Texas Gas Storage, L.P. .............................................Texas ONEOK WesTex Transmission, L.P. ........................................Delaware ONEOK Gas Storage, L.L.C. ..............................................Oklahoma ONEOK Palo Duro Pipeline Company, Inc. .................................Delaware ONEOK Resources Company ................................................Delaware ONEOK Services Company .................................................Oklahoma ONEOK Technology Company ...............................................Delaware ONEOK Energy Marketing and Trading Company, II .........................Delaware Kansas Gas Marketing Company .............................................Kansas ONEOK Energy Marketing and Trading Company, L.P. ..........................Texas ONEOK Energy Marketing Holdings, Inc. ..................................Oklahoma ONEOK Energy Marketing Company .........................................Oklahoma ONEOK Power Marketing Company ..........................................Delaware ONEOK Leasing Company ..................................................Delaware ONEOK Parking Company ..................................................Delaware ONEOK Field Services Company ...........................................Oklahoma ONEOK Bushton Processing, Inc. .........................................Delaware Blue Moon Holdings, L.L.C. .............................................Delaware ONEOK Field Services Holdings, Inc. ....................................Oklahoma ONEOK Texas Field Services, L.P. ..........................................Texas ONEOK Field Services Transmission, L.L.C. ..............................Oklahoma ONEOK Gas Processing, L.L.C. ...........................................Oklahoma ONEOK International, Inc. ..............................................Delaware ALPHA Transmission Company .............................................Oklahoma Oklahoma Natural Energy Services Company ...............................Oklahoma ONEOK Gas Gathering, L.L.C. ............................................Oklahoma Potato Hills Gas Gathering System (joint venture) ......................Oklahoma ONEOK Financing Company ..................................................Kansas Oasis Acquisition Corporation ........................................California Kansas Gas Service Company ...............................................Kansas Sycamore Gas System (general partnership) ..............................Oklahoma Fox Plant, L.L.C. ......................................................Delaware Kansas Gas Supply Corporation ..........................................Delaware ONEOK Midstream Gas Supply, L.L.C. .....................................Oklahoma ONEOK NGL Marketing, L.P. .................................................Texas ONEOK WesTex Gas Pipeline, Inc. ........................................Oklahoma ONEOK Texas Resources, Inc. ............................................Delaware In addition to the interests of the Company in the Subsidiaries set forth above, the Company also directly or indirectly holds various interests in oil and gas wells and related projects and holds various undivided interests in gasoline plants and other facilities relating to the oil and gas business and holds minority interests in various other entities and ventures. -2-