Exhibit 21
SIGNIFICANT SUBSIDIARIES
CLEVELAND-CLIFFS INC. AS OF DECEMBER 31, 2019
Name
Cliffs' Effective Ownership
Place of Incorporation
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 TIOP II, LLC
100%
Delaware, USA
Cliffs UTAC Holding LLC
100%
Delaware, USA
IronUnits LLC
100%
Delaware, USA
Northshore Mining Company
100%
Delaware, USA
The Cleveland-Cliffs Iron Company
100%
Ohio, USA