Exhibit 21
ONEOK, Inc.
SUBSIDIARIES OF THE COMPANY
AS OF DECEMBER 31, 2019
Subsidiaries | State of Incorporation or Organization |
Bighorn Gas Gathering, L.L.C. (49.0%) | Delaware |
Black Mesa Holdings, Inc. | Delaware |
Black Mesa Pipeline, Inc. | Delaware |
Black Mesa Pipeline Operations, L.L.C. | Delaware |
Black Mesa Technologies, Inc. | Oklahoma |
Border Midwestern Company | Delaware |
Border Viking Company | Delaware |
Chisholm Pipeline Company (50%) | Delaware |
Chisholm Pipeline Holdings, L.L.C. | Delaware |
Crestone Energy Ventures, L.L.C. | Delaware |
Crestone Gathering Services, L.L.C. | Delaware |
Crestone Powder River, L.L.C. | Delaware |
Crestone Wind River, L.L.C. | Delaware |
Fort Union Gas Gathering, L.L.C. (42.595%) | Delaware |
Guardian Pipeline, L.L.C. | Delaware |
Heartland Pipeline Company (general partnership) (50%) | Texas |
Lost Creek Gathering Company, L.L.C. (35%) | Delaware |
Mid Continent Market Center, L.L.C. | Kansas |
Midwestern Gas Transmission Company | Delaware |
Mont Belvieu I Fractionation Facility (joint venture) (80%) | Texas |
NBP Services, LLC | Delaware |
New Holdings, Inc. | Oklahoma |
New Holdings Sub 1, Inc. | Oklahoma |
New Holdings Sub 2, Inc. | Delaware |
Northern Border Pipeline Company (general partnership) (50%) | Texas |
OkTex Pipeline Company, L.L.C. | Delaware |
ONEOK Arbuckle II Pipeline, L.L.C. | Oklahoma |
ONEOK Arbuckle North Pipeline, L.L.C. | Delaware |
ONEOK Arbuckle Pipeline, L.L.C. | Delaware |
ONEOK Bakken Pipeline, L.L.C. | Delaware |
ONEOK Bushton Processing, L.L.C. | Delaware |
ONEOK Elk Creek Pipeline, L.L.C. | Oklahoma |
ONEOK Energy Services Canada, Ltd. | Yukon |
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, 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 Hydrocarbon GP, L.L.C. | Delaware |
ONEOK Hydrocarbon Holdings, L.L.C. | Delaware |
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ONEOK Hydrocarbon Southwest, L.L.C. | Delaware |
ONEOK Hydrocarbon, L.L.C. | Delaware |
ONEOK Hydrocarbon, L.P. | Delaware |
ONEOK ILP GP, L.L.C. | Delaware |
ONEOK Leasing Company | Delaware |
ONEOK MB I, L.P. | Delaware |
ONEOK Midstream Gas Supply, L.L.C. | Oklahoma |
ONEOK Mont Belvieu Storage Company, L.L.C. | Delaware |
ONEOK NGL Gathering, L.L.C. | Delaware |
ONEOK NGL Pipeline, L.L.C. | Delaware |
ONEOK North System, L.L.C. | Delaware |
ONEOK Northern Border Pipeline Company Holdings, L.L.C. | Oklahoma |
ONEOK Overland Pass Holdings, L.L.C. | Oklahoma |
ONEOK Parking Company, L.L.C. | Delaware |
ONEOK Partners GP, L.L.C. | Delaware |
ONEOK Partners Intermediate Limited Partnership | Delaware |
ONEOK Partners, L.P. | Delaware |
ONEOK Permian NGL Pipeline GP, L.L.C. | Delaware |
ONEOK Permian NGL Pipeline LP, L.L.C. | Delaware |
ONEOK Permian NGL Operating Company, L.L.C. | Delaware |
ONEOK Pipeline Holdings, L.L.C. | Delaware |
ONEOK Rockies Investments, L.L.C. | Delaware |
ONEOK Rockies Midstream, L.L.C. | Delaware |
ONEOK Services Company, L.L.C. | Oklahoma |
ONEOK Southeast Texas NGL Pipeline, L.L.C. | Oklahoma |
ONEOK Sterling III Pipeline, L.L.C. | Oklahoma |
ONEOK Texas Gas Storage, L.L.C. | Texas |
ONEOK Underground Storage Company, L.L.C. | Kansas |
ONEOK Unit Holdings, Inc. | Delaware |
ONEOK VESCO Holdings, L.L.C. | Delaware |
ONEOK Western Trail Pipeline, L.L.C. | Oklahoma |
ONEOK WesTex Transmission, L.L.C. | Delaware |
Overland Pass Pipeline Company LLC (50%) | Delaware |
Roadrunner Gas Transmission Holdings, LLC (50%) | Delaware |
Roadrunner Gas Transmission, LLC (100% owned by Roadrunner Gas Transmission Holdings, LLC) | Delaware |
Venice Energy Services Company, L.L.C. (10.1765%) | Delaware |
Viking Gas Transmission Company | Delaware |
West Texas LPG Pipeline Limited Partnership | Texas |
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