X0202 3 2008-05-05 0 0001020569 IRON MOUNTAIN INC IRM 0001183335 EBBIGHAUSEN HAROLD E 6 EDMUND BRIGHAM WAY WESTBOROUGH MA 01581 0 1 0 0 President, Americas Common Stock, par value, $0.01 per share 37818 D Employee Stock Option (right to buy) 13.8111 2012-03-20 Common Stock 7249 D Employee Stock Option (right to buy) 18.5867 2015-04-26 Common Stock 43043 D Employee Stock Option (right to buy) 28.9667 2015-12-07 Common Stock 17260 D Employee Stock Option (right to buy) 24.59 2011-05-24 2016-05-23 Common Stock 4066 D Employee Stock Option (right to buy) 24.59 2016-05-23 Common Stock 36600 D Employee Stock Option (right to buy) 27.18 2017-03-02 Common Stock 64386 D Employee Stock Option (right to buy) 27.18 2019-03-02 Common Stock 64385 D Employee Stock Option (right to buy) 27.735 2008-04-28 Common Stock 72111 D This option grant vested from 2003 through 2007. 21,520 shares of this option grant have vested. The remaining shares vest as follows: 10,761 shares on 4/27/2009 and 10,762 shares 4/27/2010. 6,903 shares of this option grant have vested. The remaining shares vest as follows: 3,453 shares on 12/8/2008, 3,451 shares on 12/8/2009 and 3,453 shares on 12/8/2010. 8,133 shares of this option grant have vested. The remaining shares vest as follows: 24,399 on 5/24/2010 and 4,068 shares on 5/24/2011. This option grant vests 20% annually for 5 years on the anniversary of the grant. The first 20%, 12,877 shares, vested on 3/2/2008. This option grant vests 10% annually for 10 years on the anniversary of the grant. The first 10%, 6,438 shares, vested on 3/2/2008. This option grant vests 20% annually for 5 years on the anniversary of the grant, beginning 4/28/2009. The reporting person was previously an "officer" for purposes of Section 16 of the Securities Exchange Act of 1934 through June 2007. From July 2007 through May 4, 2008, the reporting person was not an "officer". Due to a change of position and responsibilities on May 5, 2008, the reporting person again became an "officer" on such date. /s/ Harold E. Ebbinghausen 2008-05-15