X0306 4 2012-07-17 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 Phantom Stock 2012-07-17 4 A 0 13.3070 31.527 A Common Stock 13.3070 3475.3070 D Pursuant to Mr. Little's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock become payable in shares of common stock following Mr. Little's disability or cessation of service as a director. Each share of phantom stock is the economic equivalent of one share of common stock. These shares give effect to dividends paid on common stock as if reinvested in phantom stock. /s/ Garry B. Watzke, under Power of Attorney dated September 16, 2010, from Arthur D. Little 2012-07-19