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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."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. 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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 (3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. 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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 (3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. 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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 (3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. 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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 (3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. 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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 (3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. 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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 purchased at each separate price within the ranges set forth in this footnote (3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. 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Each Phantom Share is the economic equivalent of one share of Common Stock."},{"field":"shares","element":"transactionShares","label":"F2","text":"These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 8 is a weighted average price. These shares of Iron Mountain Incorporated Common Stock were purchased in multiple transactions at prices ranging from $57.50 to $57.60, 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 purchased at each separate price within the ranges set forth in this footnote (3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. Each Phantom Share is the economic equivalent of one share of Common Stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. 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Each Phantom Share is the economic equivalent of one share of Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan with respect to certain restricted stock units (\"RSUs\") received on May 9, 2023, which RSUs vest on the grant date, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. Each Phantom Share is the economic equivalent of one share of Common Stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan with respect to certain restricted stock units (\"RSUs\") received on May 9, 2023, which RSUs vest on the grant date, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. 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Each Phantom Share is the economic equivalent of one share of Common Stock."},{"field":"shares","element":"transactionShares","label":"F2","text":"These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 8 is a weighted average price. These shares of Iron Mountain Incorporated Common Stock were sold in multiple transactions at prices ranging from $52.52 to $52.71, 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 (3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. 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Each Phantom Share is the economic equivalent of one share of Common Stock."},{"field":"shares","element":"transactionShares","label":"F2","text":"These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. Each Phantom Share is the economic equivalent of one share of Common Stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. 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Each Phantom Share is the economic equivalent of one share of Common Stock"},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan with respect to certain restricted stock units (\"RSUs\") received on May 12, 2021, which RSUs vest on the grant date, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. Each Phantom Share is the economic equivalent of one share of Common Stock"},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan with respect to certain restricted stock units (\"RSUs\") received on May 12, 2021, which RSUs vest on the grant date, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. Each Phantom Share is the economic equivalent of one share of Common Stock"},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The amount of Phantom Shares beneficially owned was incorrectly disclosed due to a calculation error. 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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 (1)."}],"balance_after":151594,"source":{"system":"sec-edgar","filing":"0001020569-20-000039","document":"wf-form4_158207894864200.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1020569/000102056920000039/wf-form4_158207894864200.xml","form_type":"4"}},{"id":3267561,"issuer":{"id":517,"kind":"organization","name":"IRON MOUNTAIN INC","symbol":"IRM"},"owners":[{"id":77736,"kind":"person","name":"BAILEY CLARK H","position":1,"cik":"0001183331","reported_name":"BAILEY CLARK H","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2020-02-19T02:22:45.000Z","date":"2020-02-14","kind":"exercise","acquired":true,"shares":15555,"price":19.251,"value":299449.305,"ownership":{"direct":true},"balance_after":167149,"source":{"system":"sec-edgar","filing":"0001020569-20-000039","document":"wf-form4_158207894864200.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1020569/000102056920000039/wf-form4_158207894864200.xml","form_type":"4"}},{"id":3319467,"issuer":{"id":517,"kind":"organization","name":"IRON MOUNTAIN INC","symbol":"IRM"},"owners":[{"id":77736,"kind":"person","name":"BAILEY CLARK H","position":1,"cik":"0001183331","reported_name":"BAILEY CLARK H","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Phantom Stock","published_at":"2020-01-06T23:56:44.000Z","date":"2020-01-02","kind":"grant","acquired":true,"shares":974.9277,"price":31.8208,"value":31022.97935616,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. 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Each Phantom Share is the economic equivalent of one share of Common Stock."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F2","text":"These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares."}],"balance_after":29361.7388,"derivative":{"underlying":"Common Stock","underlying_shares":489.0068},"source":{"system":"sec-edgar","filing":"0001104659-17-000675","document":"a4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1020569/000110465917000675/a4.xml","form_type":"4"}},{"id":4587974,"issuer":{"id":517,"kind":"organization","name":"IRON MOUNTAIN INC","symbol":"IRM"},"owners":[{"id":77736,"kind":"person","name":"BAILEY CLARK H","position":1,"cik":"0001183331","reported_name":"BAILEY CLARK H","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Phantom Stock","published_at":"2016-10-04T21:38:20.000Z","date":"2016-09-30","kind":"grant","acquired":true,"shares":364.26,"price":37.9581,"value":13826.617506,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the \"Plan\"), the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. Each Phantom Share is the economic equivalent of one share of Common Stock."},{"field":"shares","element":"transactionShares","label":"F2","text":"These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the \"Plan\"), the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. Each Phantom Share is the economic equivalent of one share of Common Stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the \"Plan\"), the shares of phantom stock (the \"Phantom Shares\") will become payable in shares of Iron Mountain Incorporated common stock (\"Common Stock\") following the Reporting Person's disability or cessation of service as a director. Each Phantom Share is the economic equivalent of one share of Common Stock."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F2","text":"These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares."}],"balance_after":28872.732,"derivative":{"underlying":"Common Stock","underlying_shares":364.26},"source":{"system":"sec-edgar","filing":"0001104659-16-148666","document":"a4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1020569/000110465916148666/a4.xml","form_type":"4"}}]}