Exhibit 21
ONEOK, Inc.
SUBSIDIARIES OF THE COMPANY
AS OF DECEMBER 31, 2020
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 | ||||
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. (57.405%) | 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 | ||||
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 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 | ||||
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 |
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ONEOK MB I, L.P. | Delaware | ||||
ONEOK Midstream Gas Supply, L.L.C. | Oklahoma | ||||
ONEOK Mont Belvieu Properties, L.L.C. | Delaware | ||||
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 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 West Texas NGL Pipeline, L.L.C. | Texas | ||||
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 |
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