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Exhibit 21
SIGNIFICANT SUBSIDIARIES
CLEVELAND-CLIFFS INC. AS OF DECEMBER 31, 2020
NameCliffs' Effective OwnershipPlace of Incorporation or Formation
ÐÇ¿Õ´«Ã½ Burns Harbor LLC100%Delaware, USA
ÐÇ¿Õ´«Ã½ Steel Corporation100%Delaware, USA
ÐÇ¿Õ´«Ã½ Steel Holding Corporation100%Delaware, USA
ÐÇ¿Õ´«Ã½ Steel LLC100%Delaware, USA
Cliffs Mining Company100%Delaware, USA
Cliffs Minnesota Mining Company100%Delaware, USA
Cliffs TIOP Holding, LLC100%Delaware, USA
Cliffs TIOP, Inc.100%Michigan, USA
Cliffs UTAC Holding LLC100%Delaware, USA
IronUnits LLC100%Delaware, USA
Northshore Mining Company100%Delaware, USA
ÐÇ¿Õ´«Ã½ Steel Holdings Inc.100%Ohio, USA
The ÐÇ¿Õ´«Ã½ Iron Company100%Ohio, USA