{"url_path":"/sec/irm/proxy/2026-03-24/000102056926000028","section_key":"body","section_title":"DEFA14A body","topic":"sec","document":{"doc_type":"DEFA14A","doc_date":"2026-03-24","source_url":"https://www.sec.gov/Archives/edgar/data/1020569/0001020569-26-000028-index.html","accession_number":"0001020569-26-000028","cik":"0001020569","ticker":"IRM","issuer_name":"IRON MOUNTAIN INC","edgar_url":"https://www.sec.gov/Archives/edgar/data/1020569/0001020569-26-000028-index.html","primary_entity_key":"0001020569","primary_entity_name":"IRON MOUNTAIN INC"},"word_count":140,"has_tables":true,"body_markdown":"DEFA14A\n1\na2026ironmountainna.htm\nDEFA14A\n\nDocument\n\nUNITED STATES\nSECURITIES AND EXCHANGE COMMISSION\nWashington, D.C. 20549\n\nSCHEDULE 14A\n\nProxy Statement Pursuant to Section 14(a) of the\nSecurities Exchange Act of 1934 (Amendment No.  )\n\n☑\n\nFiled by the Registrant\n\n☐\n\nFiled by a party other than the Registrant\n\nCHECK THE APPROPRIATE BOX:\n\n☐\n\nPreliminary Proxy Statement\n\n☐\n\nConfidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))\n\n☐\n\nDefinitive Proxy Statement\n\n☑\n\nDefinitive Additional Materials\n\n☐\n\nSoliciting Material under §240.14a-12\n\nIron Mountain Incorporated\n\n(Name of Registrant as Specified In Its Charter)\n(Name of Person(s) Filing Proxy Statement, if other than the Registrant)\n\nPAYMENT OF FILING FEE (CHECK ALL BOXES THAT APPLY):\n\n☑\n\nNo fee required\n\n☐\n\nFee paid previously with preliminary materials\n\n☐\n\nFee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11"}