EXHIBIT U TRANSACTIONS IN THE COMMON SHARES OF CLIFFS NATURAL RESOURCES INC. TRANSACTIONS BY HARBINGER CAPITAL PARTNERS MASTER FUND I, LTD. Date of Number of Shares Transaction Purchased / (Sold) Price per Share 4/13/2009 (912,000) $20.1441 4/14/2009 (250,000) $19.6296 4/14/2009 (40,320) $18.9861 4/14/2009 (36,300) $18.9861 4/14/2009 (250,000) $20.0299 4/14/2009 (425,000) $18.9943 4/15/2009 (500,000) $18.4926 4/15/2009 (366,900) $18.8543 4/15/2009 (250,000) $18.7431 U-1