X0303 4 2008-07-28 0 0001020569 IRON MOUNTAIN INC IRM 0001032365 REESE C RICHARD 100 BELVEDERE STREET, APT. 9F BOSTON MA 02199 1 0 0 0 Call Option 31.05 2008-07-28 4 E 1 1 0 D 2008-07-28 2008-07-28 Common Stock 322185 0 D Put Option 20.70 2008-07-28 4 E 1 1 0 D 2008-07-28 2008-07-28 Common Stock 322185 0 D Obligation to sell. Right to sell. The exercise price reflects a 3-2 stock split that occurred after Mr. Reese entered into the zero-cost collar arrangement. Mr. Reese entered into a zero-cost collar arrangement with a third party pursuant to which he wrote covered call options and purchased put options. One of these call options and one of these put options expired on July 28, 2008. As neither such call option nor such put option was in-the-money as of the expiration date, both options expired unexercised. Expiration of a long derivative security for no value, transaction code "K" only. The number of shares reflects a 3-2 stock split that occurred after Mr. Reese entered into the zero-cost collar arrangement. /s/ Ernest W. Cloutier, under Power of Attorney dated June 5, 2008 from C. Richard Reese 2008-07-30