X0306 4 2016-09-12 0 0001020569 IRON MOUNTAIN INC IRM 0001202432 RAKOWICH WALTER C C/O IRON MOUNTAIN INCORPORATED ONE FEDERAL STREET BOSTON MA 02110 1 0 0 0 Common Stock, par value $.01 per share 2016-09-12 4 S 0 1466 36.32 D 7130 D This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective as of August 16, 2016. /s/ Elizabeth Tammaro, under Power of Attorney dated May 26, 2016, from Walter Rakowich 2016-09-14