X0202 5 2006-12-31 0 0 0001020569 IRON MOUNTAIN INC IRM 0001317446 Brennan Robert T IRON MOUNTAIN INFORMATION MGMT, INC. 745 ATLANTIC AVENUE BOSTON MA 02111 1 1 0 0 President & COO Common Stock, par value, $01.per share 2166 D Employee Stock Option (Right to Buy) 18.5866 2006-12-29 5 J 0 8965 0 A 2015-04-26 Common Stock 26895 26895 D Employee Stock Option (Right to Buy) 18.5866 2006-12-29 5 J 0 116573 0 A 2015-04-26 Common Stock 349719 349719 D The Common Stock of Iron Mountain Incorporated split, December 29, 2006 3-for-2 to record holders as of December 18, 2006, resulting in the reporting person's acquisition of 722 shares of Common Stock. Due to software limitations, the post stock split exercise price should be $18.5866667. This stock option was previously reported as covering 17,930 shares at an exercise price of $27.88 per share, but adjusted to reflect a 3-for-2 stock split effective December 29, 2006. There are 5,379 shares that are vested. Due to software limitations, the post stock split exercise price should be $18.5866667. This stock option was previously reported as covering 233,146 shares at an exercise price of $27.88 per share, but adjusted to reflect a 3-for-2 stock split effective December 29, 2006. There are 69,943 shares that are vested. Robert T. Brennan 2007-02-13