IRON MOUNTAIN INC — Director's Dealing 2010

May 3, 2010

SEC Form 4/A — Form 4/A

Issuer: IRON MOUNTAIN INC (IRM)
CIK: 0001020569
Period of Report: 2010-04-06

Reporting Person: RYAN VINCENT J (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-04-06	Phantom Stock	$	A	617	Acquired		Common Stock (617)	Direct

Footnotes

F1: 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.

F2: This amendment is being filed to correct the number of shares of phantom stock acquired by Mr. Ryan on April 6, 2010 and to give effect to dividends paid on common stock as if reinvested in phantom stock.