IRON MOUNTAIN INC — Director's Dealing 2011

May 9, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IRON MOUNTAIN INC (IRM)
CIK: 0001020569
Period of Report: 2011-05-06

Reporting Person: BAILEY CLARK H (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-06	Common Stock, par value, $.01 per share	M	16416	$12.184	Acquired	141954	Direct
2011-05-06	Common Stock, par value, $.01 per share	S	2096	$31.900	Disposed	139858	Direct
2011-05-06	Common Stock, par value, $.01 per share	S	900	$31.905	Disposed	138958	Direct
2011-05-06	Common Stock, par value, $.01 per share	S	5358	$31.910	Disposed	133600	Direct
2011-05-06	Common Stock, par value, $.01 per share	S	2900	$31.915	Disposed	130700	Direct
2011-05-06	Common Stock, par value, $.01 per share	S	3162	$31.920	Disposed	127538	Direct
2011-05-06	Common Stock, par value, $.01 per share	S	400	$31.925	Disposed	127138	Direct
2011-05-06	Common Stock, par value, $.01 per share	S	1600	$31.930	Disposed	125538	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-05-06	Stock Option (Right to Buy)	$12.184	M	16416	Disposed	2011-05-31	Common Stock (16416)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock, par value, $.01 per share	21650	Indirect
Common Stock, par value, $.01 per share	21650	Indirect

Footnotes

F1: Shares held by the Clarke H. Bailey GST Trust for the benefit of Trent S. Bailey.

F2: Shares held by the Clarke H. Bailey GST Trust for the benefit of Turner H. Bailey.

F3: This option is fully vested.