On the Record · Oneok
Oneok subsidiaries, as it lists them
The subsidiaries Oneok lists in its latest annual report, with the jurisdiction of each, linked to the filing.
Subsidiaries it lists
| Subsidiary | Jurisdiction |
|---|---|
| Acacia Natural Gas, L.L.C. | Delaware |
| Ascension Pipeline Company, LLC (50%) | Delaware |
| Bighorn Gas Gathering, L.L.C. (49.0%) | Delaware |
| Bison Prairie Assurance, L.L.C. | Oklahoma |
| 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 |
| Bridgeline Holdings, L.P. | Delaware |
| BridgeTex Pipeline Company, LLC (60%) | Delaware |
| Cedar Cove Midstream LLC (30%) | Delaware |
| Chisholm Pipeline Company (50%) | Delaware |
| Chisholm Pipeline Holdings, L.L.C. | Delaware |
| Cowtown Gas Processing Partners, L.P. | Texas |
| Cowtown Pipeline Partners L.P. | Texas |
| 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 |
| Double Eagle Pipeline LLC (50%) | Delaware |
| Eiger Express Holdings, LLC (25.5%) | Delaware |
| Elk Merger Sub II, L.L.C. | Delaware |
| EnLink Barnett Gas Services GP, LLC | Delaware |
| EnLink Barnett Gas Services, LLC | Delaware |
| EnLink Calcasieu, LLC | Delaware |
| EnLink CCS, LLC | Delaware |
| EnLink Crude Marketing, LLC | Delaware |
| EnLink Crude Pipeline LLC | Texas |
| EnLink Delaware Crude Pipeline, LLC | Texas |
| EnLink Energy GP, LLC | Delaware |
| EnLink Gas Marketing, LP | Texas |
| EnLink LIG Liquids, LLC | Louisiana |
| EnLink LIG, LLC | Louisiana |
| EnLink Louisiana Gathering, LLC | Louisiana |
| EnLink Matli Holdings, LLC | Delaware |
| EnLink Midcon Transport, LLC | Delaware |
| EnLink Midcon, LLC | Delaware |
| EnLink Midstream Finance Corporation | Delaware |
| EnLink Midstream Funding, LLC | Delaware |
| EnLink Midstream GP, LLC | Delaware |
| EnLink Midstream Holdings GP, LLC | Delaware |
| EnLink Midstream Holdings, LP | Delaware |
| EnLink Midstream Operating GP, LLC | Delaware |
| EnLink Midstream Operating, LP | Delaware |
| EnLink Midstream Manager, LLC | Delaware |
| EnLink Midstream Partners, LP | Delaware |
| EnLink Midstream Services, LLC | Texas |
| EnLink MXP Holding, LLC | Delaware |
| EnLink NGL Marketing, LP | Texas |
| EnLink NGL Pipeline, LP | Texas |
| EnLink Nominee, LLC | Delaware |
| EnLink North Texas Gathering, LP | Texas |
| EnLink Oklahoma Crude Gathering, LLC | Delaware |
| EnLink Oklahoma Gas Processing, LP | Delaware |
| EnLink Pelican, LLC | Delaware |
| EnLink Permian II, LLC | Texas |
| EnLink Permian, LLC | Texas |
| EnLink Processing Services, LLC | Delaware |
| EnLink SE Texas Crude Pipeline, LLC | Delaware |
| EnLink Texas NGL Pipeline, LLC | Texas |
| EnLink Texas Processing, LP | Texas |
| EnLink Tuscaloosa, LLC | Louisiana |
| Fort Union Gas Gathering, L.L.C. (50%) | Delaware |
| GIP III Trophy GP, LLC | Delaware |
| Gulf Coast Fractionators (38.75%) | Texas |
| Heartland Pipeline Company (general partnership) (50%) | Texas |
| HoustonLink Pipeline Company, LLC (50%) | Delaware |
| Jefferson Island Storage & Hub, L.L.C. | Delaware |
| Lost Creek Gathering Company, L.L.C. (35%) | Delaware |
| Louisiana River Market, LLC | Delaware |
| Magellan Ammonia Pipeline, L.P. | Delaware |
| Magellan Asset Services GP, LLC | Delaware |
| Magellan Asset Services, L.P. | Delaware |
| Magellan Crude Oil Pipeline Company GP, LLC | Delaware |
| Magellan Crude Oil Pipeline Company, L.P. | Delaware |
| Magellan GP, LLC | Delaware |
| Magellan Logistics & Services GP, LLC | Delaware |
| Magellan Logistics & Services, L.P. | Delaware |
| Magellan Midstream Holdings GP, LLC | Delaware |
| Magellan Midstream Partners, L.P. | Delaware |
| Magellan NGL, LLC | Delaware |
| Magellan OLP, L.P. | Delaware |
| Magellan Operating Company, LLC | Delaware |
| Magellan Operating GP, LLC | Delaware |
| Magellan Pipeline Company, L.P. | Delaware |
| Magellan Pipeline GP, LLC | Delaware |
| Magellan Pipeline Terminals GP, LLC | Delaware |
| Magellan Pipeline Terminals, L.P. | Delaware |
| Magellan Pipelines Holdings GP, LLC | Delaware |
| Magellan Pipelines Holdings, L.P. | Delaware |
| Magellan Processing GP, LLC | Delaware |
| Magellan Processing, L.P. | Delaware |
| Magellan Terminals Holdings, L.P. | Delaware |
| MBTC Pipeline LLC (80%) | Delaware |
| MDP Holdings, LLC | Delaware |
| Medallion Crude Oil Logistics, LLC | Texas |
| Medallion Gathering & Processing, LLC | Texas |
| Medallion Midland Acquisition, L.P. | Delaware |
| Medallion Midland Acquisition Partnership, L.P. | Delaware |
| Medallion Midland Gathering, LLC | Texas |
| Medallion Midland Partners, LLC | Delaware |
| Medallion Operating Company, LLC | Delaware |
| Medallion Parent Holdings, L.L.C. | Delaware |
| Medallion Pipeline Company, LLC | Texas |
| Medallion Producer Services, LLC | Texas |
| MGP Marketing, LLC | Texas |
| MidCon Express, LLC (f/k/a Lazarus Gas Gathering, LLC) | Texas |
| Mid Continent Market Center, L.L.C. | Kansas |
| Mont Belvieu I Fractionation Facility (joint venture) (80%) | Texas |
| MVP Terminalling, LLC (25.01%) | Delaware |
| MXP Parent, LLC (15%) | Delaware |
| Nine MileCo, LLC | 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 Crude Marketing, L.L.C. | Delaware |
| ONEOK Delaware Gathering, LLC (f/k/a Delaware G&P LLC) | Delaware |
| ONEOK Delaware Midstream, LLC (f/k/a Delaware Processing LLC) | 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 Gulf Coast Pipeline, L.L.C. | Delaware |
| 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 |
| ONEOK MB I, L.P. | Delaware |
| ONEOK Midland Midstream, LLC (f/k/a Coronado Midstream LLC) | Texas |
| 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 Distribution System, L.L.C. | Texas |
| 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 |
The list is long; these are the first 150 as the company lists them. From Exhibit 21 of the 10-K for 2025. Companies must list their significant subsidiaries there and may leave out smaller ones, so this is the company’s own list, not every entity it owns.
Read from Oneok’s annual reports (10-K for 2025, 10-K for 2024, 10-K for 2023) and the financial data it files with the SEC, as of 2026-02-24. Every quotation is word for word from the filing linked beside it; how these pages are built and checked. The full record is in its company data sheet.