| | | | | | | | |
| Name | | Place of Incorporation or Organization |
| Cannon Automotive Solutions - Bowling Green, Inc. | | Delaware |
| Cleveland-Cliffs Burns Harbor LLC | | Delaware |
| Cleveland-Cliffs Cleveland Works LLC | | Delaware |
| Cleveland-Cliffs Columbus LLC | | Delaware |
| Cleveland-Cliffs FPT Services Company | | Ohio |
| Cleveland-Cliffs Investments Inc. | | Ohio |
| Cleveland-Cliffs Kote Inc. | | Delaware |
| Cleveland-Cliffs Kote L.P. | | Delaware |
| Cleveland-Cliffs Minorca Mine Inc. | | Delaware |
| Cleveland-Cliffs Monessen Coke LLC | | Delaware |
| Cleveland-Cliffs Plate LLC | | Delaware |
| Cleveland-Cliffs Railways Inc. | | Delaware |
| Cleveland-Cliffs Riverdale LLC | | Delaware |
| Cleveland-Cliffs Services Holding Company | | Ohio |
| Cleveland-Cliffs South Chicago & Indiana Harbor Railway Inc. | | Delaware |
| Cleveland-Cliffs Steel Corporation | | Delaware |
| Cleveland-Cliffs Steel Holding Corporation | | Delaware |
| Cleveland-Cliffs Steel Holdings Inc. | | Ohio |
| Cleveland-Cliffs Steel LLC | | Delaware |
| Cleveland-Cliffs Steel Management Inc. | | Delaware |
| Cleveland-Cliffs Steel Properties Inc. | | Delaware |
| Cleveland-Cliffs Steelton LLC | | Delaware |
| Cleveland-Cliffs Steelworks Railway Inc. | | Delaware |
| Cleveland-Cliffs Tek Inc. | | Delaware |
| Cleveland-Cliffs Tek Kote Acquisition Corporation | | Ohio |
| Cleveland-Cliffs Tek L.P. | | Delaware |
| Cleveland-Cliffs Tooling and Stamping Company | | Delaware |
| Cleveland-Cliffs Tooling and Stamping Holdings LLC | | Delaware |
| Cleveland-Cliffs Tubular Components LLC | | Delaware |
| Cleveland-Cliffs Weirton LLC | | Delaware |
| Cliffs Mining Company | | Delaware |
| Cliffs Minnesota Mining Company | | Delaware |
| Cliffs Steel Inc. | | Ohio |
| Cliffs TIOP Holding, LLC | | Delaware |
| Cliffs TIOP, Inc. | | Michigan |
| Cliffs TIOP II, LLC | | Delaware |
| Cliffs UTAC Holding LLC | | Delaware |