X0306 4 2013-04-11 0 0001020569 IRON MOUNTAIN INC IRM 0001184214 HALVORSEN KRIS 11 MCINNIS PARKWAY SAN RAFAEL CA 94903 1 0 0 0 Phantom Stock 2013-04-11 4 A 0 521.4501 37.1313 A Common Stock 521.4501 5299.4121 D 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 share of phantom stock is the economic equivalent of one share of common stock. /s/ Sarah Cammarata, under Power of Attorney dated September 16, 2010, from Per-Kristian Halvorsen 2013-04-15