X0303 4 2009-04-13 0 0001020569 IRON MOUNTAIN INC IRM 0001218784 RYAN VINCENT J SCHOONER CAPITAL 745 ATLANTIC AVENUE BOSTON MA 02111 1 0 0 0 Phantom Stock 2009-04-13 4 A 0 548 24.5857 A Common Stock 548 548 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 cash 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/ Ernest W. Cloutier, under Power of Attorney dated June 5, 2008 from Vincent J. Ryan 2009-04-15