X0303 4 2011-04-06 0 0001020569 IRON MOUNTAIN INC IRM 0001218784 RYAN VINCENT J SCHOONER CAPITAL 745 ATLANTIC AVENUE BOSTON MA 02111 1 0 0 0 Phantom Stock 2011-04-06 4 A 0 500 32.9688 A Common Stock 500 6196.0484 D Pursuant to Mr. Ryan'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. Ryan's disability or cessation of service as a director. 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 Vincent J. Ryan 2011-04-07