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These shares of Iron Mountain Incorporated common stock (\"Common Stock\") were sold in multiple transactions at prices ranging from $43.78 to $43.85, inclusive. The Reporting Person undertakes to provide Iron Mountain Incorporated (the \"Company\"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (2)."}],"balance_after":75097,"source":{"system":"sec-edgar","filing":"0001020569-21-000170","document":"wf-form4_162198157735252.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1020569/000102056921000170/wf-form4_162198157735252.xml","form_type":"4"}},{"id":2697542,"issuer":{"id":517,"kind":"organization","name":"IRON MOUNTAIN INC","symbol":"IRM"},"owners":[{"id":139081,"kind":"person","name":"Cloutier Ernest W","position":1,"cik":"0001291613","reported_name":"Cloutier Ernest W","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & GM, RIM"}}],"security":"Common Stock, par value $.01 per share","published_at":"2021-05-25T22:26:38.000Z","date":"2021-05-24","kind":"exercise","acquired":true,"shares":24965,"price":38.83,"value":969390.95,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective March 1, 2021."}],"balance_after":100062,"source":{"system":"sec-edgar","filing":"0001020569-21-000170","document":"wf-form4_162198157735252.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1020569/000102056921000170/wf-form4_162198157735252.xml","form_type":"4"}},{"id":2717083,"issuer":{"id":517,"kind":"organization","name":"IRON MOUNTAIN INC","symbol":"IRM"},"owners":[{"id":139081,"kind":"person","name":"Cloutier Ernest W","position":1,"cik":"0001291613","reported_name":"Cloutier Ernest W","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & GM, RIM"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2021-05-12T20:24:41.000Z","date":"2021-05-10","kind":"exercise","acquired":false,"shares":34199,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"This stock option, representing a right to purchase a total of 34,199 shares, is fully vested."}],"balance_after":0,"derivative":{"exercise_price":37,"expiration_date":"2027-02-16","underlying":"Common Stock","underlying_shares":34199},"source":{"system":"sec-edgar","filing":"0001020569-21-000139","document":"wf-form4_162085106573119.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1020569/000102056921000139/wf-form4_162085106573119.xml","form_type":"4"}},{"id":2717082,"issuer":{"id":517,"kind":"organization","name":"IRON MOUNTAIN INC","symbol":"IRM"},"owners":[{"id":139081,"kind":"person","name":"Cloutier Ernest W","position":1,"cik":"0001291613","reported_name":"Cloutier Ernest W","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & GM, RIM"}}],"security":"Common Stock, par value $.01 per share","published_at":"2021-05-12T20:24:41.000Z","date":"2021-05-10","kind":"sale","acquired":false,"shares":34199,"price":41.981,"value":1435708.219,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective March 1, 2021."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. 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The Reporting Person undertakes to provide Iron Mountain Incorporated (the \"Company\"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (2)."}],"balance_after":75097,"source":{"system":"sec-edgar","filing":"0001020569-21-000139","document":"wf-form4_162085106573119.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1020569/000102056921000139/wf-form4_162085106573119.xml","form_type":"4"}},{"id":2731140,"issuer":{"id":517,"kind":"organization","name":"IRON MOUNTAIN INC","symbol":"IRM"},"owners":[{"id":139081,"kind":"person","name":"Cloutier Ernest W","position":1,"cik":"0001291613","reported_name":"Cloutier Ernest W","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & GM, RIM"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2021-05-05T01:22:06.000Z","date":"2021-04-29","kind":"exercise","acquired":false,"shares":25112,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective March1, 2021."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"This stock option, representing a right to purchase a total of 37,668 shares, is fully vested."}],"balance_after":12556,"derivative":{"exercise_price":35.72,"expiration_date":"2029-02-20","underlying":"Common Stock","underlying_shares":25112},"source":{"system":"sec-edgar","filing":"0001020569-21-000130","document":"wf-form4_162017768641077.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1020569/000102056921000130/wf-form4_162017768641077.xml","form_type":"4"}},{"id":2731139,"issuer":{"id":517,"kind":"organization","name":"IRON MOUNTAIN INC","symbol":"IRM"},"owners":[{"id":139081,"kind":"person","name":"Cloutier Ernest W","position":1,"cik":"0001291613","reported_name":"Cloutier Ernest W","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & GM, RIM"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2021-05-05T01:22:06.000Z","date":"2021-04-29","kind":"exercise","acquired":false,"shares":31111,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective March1, 2021."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"This stock option, representing a right to purchase a total of 31,111 shares, is fully vested."}],"balance_after":0,"derivative":{"exercise_price":33.72,"expiration_date":"2028-02-15","underlying":"Common Stock","underlying_shares":31111},"source":{"system":"sec-edgar","filing":"0001020569-21-000130","document":"wf-form4_162017768641077.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1020569/000102056921000130/wf-form4_162017768641077.xml","form_type":"4"}},{"id":2731138,"issuer":{"id":517,"kind":"organization","name":"IRON MOUNTAIN INC","symbol":"IRM"},"owners":[{"id":139081,"kind":"person","name":"Cloutier Ernest W","position":1,"cik":"0001291613","reported_name":"Cloutier Ernest W","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP & GM, RIM"}}],"security":"Common Stock, par value $.01 per share","published_at":"2021-05-05T01:22:06.000Z","date":"2021-04-29","kind":"sale","acquired":false,"shares":25112,"price":39.964,"value":1003575.968,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective March1, 2021."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. 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