X0306 4 2013-06-07 0 0001020569 IRON MOUNTAIN INC IRM 0001183339 LITTLE ARTHUR D P.O. BOX 166 HUNTRESS BRIDGE ROAD S. EFFINGHAM NH 03882 1 0 0 0 Common Stock, par value $.01 per share 2013-06-07 4 P 0 1800 29.0062 A 1800 I See Footnote Common Stock, par value $.01 per share 3840 D Shares held by the Reporting Person's wife. /s/ Sarah Cammarata, under Power of Attorney dated September 16, 2010, from Arthur D. Little 2013-06-07