Required information concerning the registrant's subsidiaries

EX-21 6 dex21.htm REQUIRED INFORMATION CONCERNING THE REGISTRANT'S SUBSIDIARIES Required information concerning the registrant's subsidiaries

Exhibit 21


Subsidiary		State of Incorporation or Organization
Blue Moon Holdings, L.L.C.		Delaware
Fox Plant, L.L.C. (50%)		Delaware
Kansas Gas Marketing Company		Kansas
Kansas Gas Service Company, L.L.C.		Kansas
Kansas Gas Supply Corporation		Delaware
Mercado Gas Services Inc.		Delaware
Mid Continent Market Center, Inc.		Kansas
NBP Services, LLC		Delaware
Northern Border Pipeline Corporation		Delaware
Northern Plains Natural Gas Company, LLC¹		Delaware
Oasis Acquisition Corporation		California
Oklahoma Natural Energy Services Company		Oklahoma
OkTex Pipeline Company		Delaware
ONEOK Bushton Processing, Inc.		Delaware
ONEOK Energy Marketing Company		Oklahoma
ONEOK Energy Resources Company		Delaware
ONEOK Energy Resources Holdings, L.L.C.		Delaware
ONEOK Energy Services Canada, Ltd.		Canada
ONEOK Energy Services Company, II		Delaware
ONEOK Energy Services Company, L.P.		Texas
ONEOK Energy Services Holdings, L.L.C.		Oklahoma
ONEOK Field Services Company		Oklahoma
ONEOK Field Services Holdings, L.L.C.		Oklahoma
ONEOK Gas Gathering, L.L.C.		Oklahoma
ONEOK Gas Storage Holdings, L.L.C.		Delaware
ONEOK Gas Storage, L.L.C.		Oklahoma
ONEOK Gas Transportation, L.L.C.		Oklahoma
ONEOK International, Inc.		Delaware
ONEOK Kansas Company		Kansas
ONEOK Leasing Company		Delaware
ONEOK Midstream Gas Supply, L.L.C.		Oklahoma
ONEOK NGL Marketing, L.P.		Texas
ONEOK Palo Duro Pipeline Company, Inc.		Delaware
ONEOK Parking Company, L.L.C.		Delaware
ONEOK Propane Company		Delaware
ONEOK Sayre Storage Company		Delaware
ONEOK Services Company		Oklahoma
ONEOK Technology Company		Delaware
ONEOK Texas Energy Holdings, L.L.C.		Delaware

¹	Northern Plains Natural Gas Company, LLC owns a 1.067% limited partner interest and a .5% general partner interest in Northern Border Partners, L.P. The direct and indirect subsidiaries of Northern Border Partners, L.P. are not listed here.


ONEOK Texas Energy Resources, L.P.		Delaware
ONEOK Texas Field Services, L.P.		Texas
ONEOK Texas Gas Storage, L.P.		Texas
ONEOK Texas Resources, Inc.		Delaware
ONEOK Transmission Company		Delaware
ONEOK WesTex Gas Pipeline, Inc.		Oklahoma
ONEOK WesTex Transmission, L.P.		Delaware
Pan Border Gas Company, LLC²		Delaware
Potato Hills Gas Gathering System (joint venture) (50%)		Oklahoma
Sycamore Gas System (general partnership) (48.445%)		Oklahoma
TGS Rio, L.L.C.		Delaware

²	Pan Border Gas Company, LLC owns a .3250% general partner interest in Northern Border Partners, L.P. The direct and indirect subsidiaries of Northern Border Partners, L.P. are not listed here.