X0306 4 2013-08-16 0 0001020569 IRON MOUNTAIN INC IRM 0001202432 RAKOWICH WALTER C C/O IRON MOUNTAIN INCORPORATED 745 ATLANTIC AVENUE BOSTON MA 02111 1 0 0 0 Common Stock, par value $.01 per share 2013-08-16 4 A 0 4073 0.01 A 4073 D Consists of shares issuable upon the settlement of restricted stock units granted on August 16, 2013. The restricted stock units shall vest on the one year anniversary of the grant date (or, if earlier, the annual meeting of stockholders that is closest to the one year anniversary). /s/ Sarah Cammarata, under Power of Attorney dated July 29, 2013, from Walter Rakowich 2013-08-20