| | | | | | | | |
| Name | Cliffs' Effective Ownership | Place of Incorporation or Formation |
| Cleveland-Cliffs Burns Harbor LLC | 100% | Delaware, USA |
| Cleveland-Cliffs Steel Corporation | 100% | Delaware, USA |
| Cleveland-Cliffs Steel Holding Corporation | 100% | Delaware, USA |
| Cleveland-Cliffs Steel LLC | 100% | Delaware, USA |
| Cliffs Mining Company | 100% | Delaware, USA |
| Cliffs Minnesota Mining Company | 100% | Delaware, USA |
| Cliffs TIOP Holding, LLC | 100% | Delaware, USA |
| Cliffs TIOP, Inc. | 100% | Michigan, USA |
| Cliffs UTAC Holding LLC | 100% | Delaware, USA |
| IronUnits LLC | 100% | Delaware, USA |
| Northshore Mining Company | 100% | Delaware, USA |
| Cleveland-Cliffs Steel Holdings Inc. | 100% | Ohio, USA |
| The Cleveland-Cliffs Iron Company | 100% | Ohio, USA |