X0306 4 2013-07-17 0 0001020569 IRON MOUNTAIN INC IRM 0001244482 ANTENUCCI TED R C/O IRON MOUNTAIN INCORPORATED 745 ATLANTIC AVENUE BOSTON MA 02111 1 0 0 0 Phantom Stock 2013-07-17 4 A 0 41.3166 28.7768 A Common Stock 41.3166 8401.7115 D Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock will become payable in shares of Iron Mountain Incorporated common stock on various dates selected by the Reporting Person or as otherwise provided in the Iron Mountain Incorporated Directors Deferred Compensation Plan. 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 June 21, 2011, from Ted Antenucci 2013-07-19