X0306 4 2013-06-06 0 0001020569 IRON MOUNTAIN INC IRM 0001184214 HALVORSEN KRIS 11 MCINNIS PARKWAY SAN RAFAEL CA 94903 1 0 0 0 Phantom Stock 2013-06-06 4 A 0 3953 0.01 A Common Stock 3953 9256.7707 D Phantom Stock 2013-06-06 4 A 0 218.3949 33.9414 A Common Stock 218.3949 9475.1656 D Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan with respect to certain restricted stock units ("RSUs") received on June 6, 2013, which RSUs shall vest on the one year anniversary of the grant date (or, if earlier, the annual meeting of stockholders that is closest to the one year anniversary), the shares of phantom stock (the "Phantom Shares") become payable in Iron Mountain Incorporated common stock following the Reporting Person's disability or cessation of service as a director. Each Phantom Share is the economic equivalent of one share of common stock. Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock 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 Phantom Share is the economic equivalent of one share of common stock. These shares give effect to dividends paid on previously reported restricted stock units as if reinvested in Phantom Shares. /s/ Sarah Cammarata, under Power of Attorney dated September 16, 2010, from Per-Kristian Halvorsen 2013-06-10