IRON MOUNTAIN INC — Director's Dealing 2012

Mar 13, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IRON MOUNTAIN INC (IRM)
CIK: 0001020569
Period of Report: 2012-03-07

Reporting Person: Duale Marc A (President, Iron Mountain Int'l)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-03-11	Common Stock, par value $.01 per share	A	1066	—	Acquired	1066	Direct
2012-03-11	Common Stock, par value $.01 per share	F	48	$28.74	Disposed	1018	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-03-07	Performance Units	$	A	7088	Acquired		Common Stock (7088)	Direct
2012-03-09	Restricted Stock Units	$	A	10396	Acquired		Common Stock (10396)	Direct
2012-03-11	Restricted Stock Units	$	D	1066	Acquired		Common Stock (1066)	Direct

Footnotes

F1: This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the reporting person.

F2: Each performance unit ("PU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock.

F3: The PUs were previously granted to the reporting person on March 11, 2011, and on March 7, 2012 the Compensation Committee of Iron Mountain Incorporated's Board of Directors determined the actual award of PUs under the grant after completion of the relevant performance period.

F4: The PUs fully vest on March 11, 2014, subject to certain exceptions, if the officer is, as of that date, continuing to perform services for Iron Mountain Incorporated.

F5: Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock.

F6: The RSUs vest in three annual installments beginning on the first anniversary of the date of grant.

F7: The RSUs, representing a right to purchase a total of 3,202 shares of Iron Mountain Incorporated common stock, were granted in March 2011 and vest in three annual installments beginning on March 11, 2012, which was the first anniversary of the date on which the RSUs were granted.