X0303 4 2011-05-25 0 0001020569 IRON MOUNTAIN INC IRM 0001219445 MCKEON BRIAN P C/O IRON MOUNTAIN INFORMATION MANAGEMENT, INC., 745 ATLANTIC AVENUE BOSTON MA 02111 0 1 0 0 Chief Financial Officer Common Stock 2011-05-25 4 M 0 3616 27.665 A 10020 D Common Stock 2011-05-25 4 M 0 65064 27.665 A 75084 D Common Stock 2011-05-25 4 M 0 14458 27.665 A 89542 D Common Stock 2011-05-25 4 S 0 83138 32.8639 D 6404 D Employee Stock Option (Right to Buy) 27.665 2011-05-25 4 M 0 3616 0 D 2019-05-23 Common Stock 3616 21692 D Employee Stock Option (Right to Buy) 27.665 2011-05-25 4 M 0 65064 0 D 2017-05-23 Common Stock 65064 65065 D Employee Stock Option (Right to Buy) 27.665 2011-05-25 4 M 0 14458 0 D 2017-05-23 Common Stock 14458 14460 D The transactions reported on this Form 4 were affected pursuant to a 10b5-1 trading plan adopted by the reporting person on May 4, 2011. Includes 6,404 shares issuable upon the settlement of restricted stock units granted on March 11, 2011. The restricted stock units vest in three equal annual installments beginning on the first anniversary of the date of grant. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.63 to $32.98, inclusive. The reporting person undertakes to provide to Iron Mountain Incorporated, any security holder of Iron Mountain Incorporated, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (3). The option, representing a right to purchase a total of 36,153 shares, vests in ten equal annual installments beginning on May 24, 2008, which was the first anniversary of the date on which the option was granted. The option, representing a right to purchase a total of 325,321 shares, vests in five equal annual installments beginning on May 24, 2008, which was the first anniversary of the date on which the option was granted. The option, representing a right to purchase a total of 72,293 shares, vests in five equal annual installments beginning on May 24, 2008, which was the first anniversary of the date on which the option was granted. /s/ Sarah Cammarata, under Power of Attorney dated September 15, 2010, from Brian McKeon 2011-05-27