X0303 4 2009-08-25 0 0001020569 IRON MOUNTAIN INC IRM 0001032365 REESE C RICHARD 100 BELVIDERE STREET, APT. 9F BOSTON MA 02199 1 1 0 0 Executive Chairman Common Stock, par value, $.01 per share 2009-08-25 4 S 0 22183 29.7650 D 855914 D Common Stock, par value, $.01 per share 2009-08-26 4 S 0 161717 29.8411 D 694197 D Common Stock, par value, $.01 per share 1222086 I Shares held in family owned LLC Common Stock, par value, $.01 per share 2950590 I By contract The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 18, 2009. Price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was $29.75 to $29.82 per share. The Reporting Person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, Iron Mountain Incorporated, or a security holder of Iron Mountain Incorporated, full information regarding the number of shares sold at each separate price. Price reflected is the weighted-average sale price for shares sold. The range of sale prices for the transactions reported was $29.75 to $30.04 per share. The Reporting Person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, Iron Mountain Incorporated, or a security holder of Iron Mountain Incorporated, full information regarding the number of shares sold at each separate price. Mr. Reese's wife and a trust for the benefit of Mr. Reese's children own all of the interests in the Reese Family 2005 LLC ("LLC"). Mr. Reese is the investment manager of the LLC and therefore has control over the sale or distribution of any shares held by the LLC, the timing of such sales or distributions, and the use of the proceeds of any sale or distributions. Mr. Reese disclaims beneficial ownership of all securities held by the LLC and this report should not be deemed an admission that the reporting person is beneficial owner of such securities for purposes of Section 16 of the Exchange Act of 1934, as amended, or for any purpose. Mr. Reese shares beneficial ownership of these shares with Schooner Capital Corporation as a result of a 1988 deferred compensation arrangement, as amended, between Schooner Capital LLC ("Schooner") and Mr. Reese relating to Mr. Reese's former services as President of the predecessor corporation to Schooner. Pursuant to such arrangement, Mr. Reese is entitled to receive benefits equivalent to the fair market value of such shares with payments to Mr. Reese commencing on the first business day of 2013 and payable in ten annual installments; however, Mr. Reese has the right to defer the commencement of such installments in certain circumstances. In addition, any unpaid benefits pursuant to this arrangement shall be payable to Mr. Reese's beneficiary(ies) in a lump sum upon his death. Benefits pursuant to this arrangement are payable in cash or, at Mr. Reese's election, common stock. /s/ Ernest W. Cloutier, under Power of Attorney dated June 5, 2008 from C. Richard Reese 2009-08-27