Table of Contents ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Transition Period from to Commission file number 1-13045 IRON MOUNTAIN INCORPORATED (Exact Name of Registrant as Specified in Its Charter) (State or other Jurisdiction of Incorporation or Organization) (I.R.S. Employer Identification No.) UNITED STATES SEC ...