IRM

SEC source: 0001020569-18-000126 · wf-form4_154456512507236.xml · derivative · entry 3

MARSON DEBORAH · CIK 0001691591 · EVP, General Counsel, Sec.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,165

Underlying: Common Stock · 2,158 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").

F3 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 6,480 shares of Common Stock, were granted to the Reporting Person on December 7, 2016 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

F3 · derivative.expiration_date: The RSUs, representing a contingent right to receive a total of 6,480 shares of Common Stock, were granted to the Reporting Person on December 7, 2016 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001020569-18-000126 · wf-form4_154456512507236.xml · nonDerivative · entry 2

MARSON DEBORAH · CIK 0001691591 · EVP, General Counsel, Sec.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,618

SEC source: 0001020569-18-000126 · wf-form4_154456512507236.xml · nonDerivative · entry 1

MARSON DEBORAH · CIK 0001691591 · EVP, General Counsel, Sec.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,253

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on December 7, 2016.

SEC source: 0001020569-18-000124 · wf-form4_154145465065202.xml · nonDerivative · entry 1

FORD MONTE E · CIK 0001085361 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,940

F1 · shares: Consists of shares issuable upon the settlement of restricted stock units ("RSUs") granted on November 1, 2018. The RSUs vest on the grant date.

SEC source: 0001020569-18-000120 · wf-form4_154101635012111.xml · derivative · entry 3

Jeffries Emma · CIK 0001747306 · EVP, Chief People Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 655 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").

F3 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 1,959 shares of Common Stock, were granted to the Reporting Person on October 28, 2015.

F3 · derivative.expiration_date: The RSUs, representing a contingent right to receive a total of 1,959 shares of Common Stock, were granted to the Reporting Person on October 28, 2015.

SEC source: 0001020569-18-000120 · wf-form4_154101635012111.xml · nonDerivative · entry 2

Jeffries Emma · CIK 0001747306 · EVP, Chief People Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,259

SEC source: 0001020569-18-000120 · wf-form4_154101635012111.xml · nonDerivative · entry 1

Jeffries Emma · CIK 0001747306 · EVP, Chief People Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,451

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: This acquisition is reported to reflect the vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on October 28, 2015.

SEC source: 0001020569-18-000112 · wf-form4_153998264431309.xml · derivative · entry 3

ALLEN PETER A · CIK 0001184546 · SVP, GM Data Management

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,494

Underlying: Common Stock · 1,245 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").

F3 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 3,739 shares of Common Stock, were granted to the Reporting Person on October 17, 2017 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

F3 · derivative.expiration_date: The RSUs, representing a contingent right to receive a total of 3,739 shares of Common Stock, were granted to the Reporting Person on October 17, 2017 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001020569-18-000112 · wf-form4_153998264431309.xml · nonDerivative · entry 2

ALLEN PETER A · CIK 0001184546 · SVP, GM Data Management

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 942

SEC source: 0001020569-18-000112 · wf-form4_153998264431309.xml · nonDerivative · entry 1

ALLEN PETER A · CIK 0001184546 · SVP, GM Data Management

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,245

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on October 17, 2017.

SEC source: 0001020569-18-000110 · wf-form4_153964696588756.xml · derivative · entry 3

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,669.1817

Underlying: Common Stock · 0.9558 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F2 · shares: These shares give effect to the Reporting Person's quarterly cash compensation for service on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

F2 · derivative.underlying_shares: These shares give effect to the Reporting Person's quarterly cash compensation for service on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000110 · wf-form4_153964696588756.xml · derivative · entry 2

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,668.2259

Underlying: Common Stock · 792 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F2 · shares: These shares give effect to the Reporting Person's quarterly cash compensation for service on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

F2 · derivative.underlying_shares: These shares give effect to the Reporting Person's quarterly cash compensation for service on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000110 · wf-form4_153964696588756.xml · derivative · entry 1

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,876.2259

Underlying: Common Stock · 3 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F2 · shares: These shares give effect to the Reporting Person's quarterly cash compensation for service on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

F2 · derivative.underlying_shares: These shares give effect to the Reporting Person's quarterly cash compensation for service on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000106 · wf-form4_153869324723272.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,288.4206

Underlying: Common Stock · 613.0569 shares

Expires not disclosed

F1 · derivative.exercise_price: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F1 · derivative.expiration_date: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · derivative.underlying_shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000105 · wf-form4_153869322090335.xml · derivative · entry 1

VERRECCHIA ALFRED J · CIK 0001214978 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,331.7512

Underlying: Common Stock · 630.6829 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F2 · shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

F2 · derivative.underlying_shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000104 · wf-form4_153869316411658.xml · derivative · entry 1

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,873.2259

Underlying: Common Stock · 403.3149 shares

Expires not disclosed

F1 · derivative.exercise_price: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F1 · derivative.expiration_date: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · derivative.underlying_shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000103 · wf-form4_153869313619403.xml · derivative · entry 1

BAILEY CLARK H · CIK 0001183331 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,697.9014

Underlying: Common Stock · 704.4955 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F2 · shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

F2 · derivative.underlying_shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000098 · wf-form4_153575208262203.xml · derivative · entry 1

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,469.911

Underlying: Common Stock · 75.5 shares

Expires not disclosed

F1 · derivative.exercise_price: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · shares: The Reporting Person was eligible to receive but, as a result of an error in connection with the administration of the Plan, did not receive the dividend previously paid on Common Stock on July 2, 2018 (the "Dividend"), with respect to those certain restricted stock units granted to the Reporting Person on June 18, 2018 (the "RSUs"). The administrator of the Plan completed this transaction to give retroactive effect to the Dividend solely with respect to the RSUs.

F1 · derivative.exercise_date: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F1 · derivative.expiration_date: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · derivative.underlying_shares: The Reporting Person was eligible to receive but, as a result of an error in connection with the administration of the Plan, did not receive the dividend previously paid on Common Stock on July 2, 2018 (the "Dividend"), with respect to those certain restricted stock units granted to the Reporting Person on June 18, 2018 (the "RSUs"). The administrator of the Plan completed this transaction to give retroactive effect to the Dividend solely with respect to the RSUs.

SEC source: 0001020569-18-000097 · wf-form4_153575204640446.xml · derivative · entry 1

BAILEY CLARK H · CIK 0001183331 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,993.4059

Underlying: Common Stock · 75.5 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F2 · shares: The Reporting Person was eligible to receive but, as a result of an error in connection with the administration of the Plan, did not receive the dividend previously paid on Common Stock on July 2, 2018 (the "Dividend"), with respect to those certain restricted stock units granted to the Reporting Person on June 18, 2018 (the "RSUs"). The administrator of the Plan completed this transaction to give retroactive effect to the Dividend solely with respect to the RSUs.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

F2 · derivative.underlying_shares: The Reporting Person was eligible to receive but, as a result of an error in connection with the administration of the Plan, did not receive the dividend previously paid on Common Stock on July 2, 2018 (the "Dividend"), with respect to those certain restricted stock units granted to the Reporting Person on June 18, 2018 (the "RSUs"). The administrator of the Plan completed this transaction to give retroactive effect to the Dividend solely with respect to the RSUs.

SEC source: 0001020569-18-000096 · wf-form4_153575200804530.xml · derivative · entry 1

VERRECCHIA ALFRED J · CIK 0001214978 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,701.0683

Underlying: Common Stock · 75.5 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F2 · shares: The Reporting Person was eligible to receive but, as a result of an error in connection with the administration of the Plan, did not receive the dividend previously paid on Common Stock on July 2, 2018 (the "Dividend"), with respect to those certain restricted stock units granted to the Reporting Person on June 18, 2018 (the "RSUs"). The administrator of the Plan completed this transaction to give retroactive effect to the Dividend solely with respect to the RSUs.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

F2 · derivative.underlying_shares: The Reporting Person was eligible to receive but, as a result of an error in connection with the administration of the Plan, did not receive the dividend previously paid on Common Stock on July 2, 2018 (the "Dividend"), with respect to those certain restricted stock units granted to the Reporting Person on June 18, 2018 (the "RSUs"). The administrator of the Plan completed this transaction to give retroactive effect to the Dividend solely with respect to the RSUs.

SEC source: 0001020569-18-000095 · wf-form4_153575197110576.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,675.3637

Underlying: Common Stock · 75.5 shares

Expires not disclosed

F1 · derivative.exercise_price: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · shares: The Reporting Person was eligible to receive but, as a result of an error in connection with the administration of the Plan, did not receive the dividend previously paid on Common Stock on July 2, 2018 (the "Dividend"), with respect to those certain restricted stock units granted to the Reporting Person on June 18, 2018 (the "RSUs"). The administrator of the Plan completed this transaction to give retroactive effect to the Dividend solely with respect to the RSUs.

F1 · derivative.exercise_date: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F1 · derivative.expiration_date: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · derivative.underlying_shares: The Reporting Person was eligible to receive but, as a result of an error in connection with the administration of the Plan, did not receive the dividend previously paid on Common Stock on July 2, 2018 (the "Dividend"), with respect to those certain restricted stock units granted to the Reporting Person on June 18, 2018 (the "RSUs"). The administrator of the Plan completed this transaction to give retroactive effect to the Dividend solely with respect to the RSUs.

SEC source: 0001020569-18-000084 · wf-form4_153272223414905.xml · nonDerivative · entry 5

Brown Stuart B · CIK 0001378303 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,626

F2 · kind: This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective as of June 18, 2018.

SEC source: 0001020569-18-000084 · wf-form4_153272223414905.xml · derivative · entry 7

Brown Stuart B · CIK 0001378303 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,312

Underlying: Common Stock · 7,290 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").

F5 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 21,892 shares of Common Stock, were granted to the Reporting Person on July 25, 2016 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

F5 · derivative.expiration_date: The RSUs, representing a contingent right to receive a total of 21,892 shares of Common Stock, were granted to the Reporting Person on July 25, 2016 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001020569-18-000084 · wf-form4_153272223414905.xml · derivative · entry 6

Brown Stuart B · CIK 0001378303 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,463

Underlying: Common Stock · 1,458 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").

F4 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 4,378 shares of Common Stock, were granted to the Reporting Person on July 25, 2016 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

F4 · derivative.expiration_date: The RSUs, representing a contingent right to receive a total of 4,378 shares of Common Stock, were granted to the Reporting Person on July 25, 2016 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001020569-18-000084 · wf-form4_153272223414905.xml · nonDerivative · entry 4

Brown Stuart B · CIK 0001378303 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,376

SEC source: 0001020569-18-000084 · wf-form4_153272223414905.xml · nonDerivative · entry 3

Brown Stuart B · CIK 0001378303 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,522

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on July 25, 2016.

SEC source: 0001020569-18-000084 · wf-form4_153272223414905.xml · nonDerivative · entry 2

Brown Stuart B · CIK 0001378303 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,232

SEC source: 0001020569-18-000084 · wf-form4_153272223414905.xml · nonDerivative · entry 1

Brown Stuart B · CIK 0001378303 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,661

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on July 25, 2016.

SEC source: 0001020569-18-000077 · wf-form4_153255356290444.xml · derivative · entry 3

Fox Raymond · CIK 0001731661 · EVP and Chief Risk Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,065 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").

F3 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 3,188 shares of Common Stock, were granted to the Reporting Person on July 21, 2015 and have fully vested.

F3 · derivative.expiration_date: The RSUs, representing a contingent right to receive a total of 3,188 shares of Common Stock, were granted to the Reporting Person on July 21, 2015 and have fully vested.

SEC source: 0001020569-18-000077 · wf-form4_153255356290444.xml · nonDerivative · entry 2

Fox Raymond · CIK 0001731661 · EVP and Chief Risk Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,751

SEC source: 0001020569-18-000077 · wf-form4_153255356290444.xml · nonDerivative · entry 1

Fox Raymond · CIK 0001731661 · EVP and Chief Risk Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,071

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on July 21, 2015.

SEC source: 0001020569-18-000076 · wf-form4_153255350682228.xml · derivative · entry 6

Evens Deirdre · CIK 0001401237 · EVP & GM, Rec and Info Mgmt NA

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 7,988 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").

F4 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 23,915 shares of Common Stock, were granted to the Reporting Person on July 21, 2015 and have fully vested.

F4 · derivative.expiration_date: The RSUs, representing a contingent right to receive a total of 23,915 shares of Common Stock, were granted to the Reporting Person on July 21, 2015 and have fully vested.

SEC source: 0001020569-18-000076 · wf-form4_153255350682228.xml · derivative · entry 5

Evens Deirdre · CIK 0001401237 · EVP & GM, Rec and Info Mgmt NA

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,917 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").

F3 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 5,739 shares of Common Stock, were granted to the Reporting Person on July 21, 2015 and have fully vested.

F3 · derivative.expiration_date: The RSUs, representing a contingent right to receive a total of 5,739 shares of Common Stock, were granted to the Reporting Person on July 21, 2015 and have fully vested.

SEC source: 0001020569-18-000076 · wf-form4_153255350682228.xml · nonDerivative · entry 4

Evens Deirdre · CIK 0001401237 · EVP & GM, Rec and Info Mgmt NA

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,257

SEC source: 0001020569-18-000076 · wf-form4_153255350682228.xml · nonDerivative · entry 3

Evens Deirdre · CIK 0001401237 · EVP & GM, Rec and Info Mgmt NA

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,967

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on July 21, 2015.

SEC source: 0001020569-18-000076 · wf-form4_153255350682228.xml · nonDerivative · entry 2

Evens Deirdre · CIK 0001401237 · EVP & GM, Rec and Info Mgmt NA

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,979

SEC source: 0001020569-18-000076 · wf-form4_153255350682228.xml · nonDerivative · entry 1

Evens Deirdre · CIK 0001401237 · EVP & GM, Rec and Info Mgmt NA

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,543

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on July 21, 2015.

SEC source: 0001020569-18-000072 · wf-form4_153134829463580.xml · derivative · entry 4

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,394.411

Underlying: Common Stock · 0.6384 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F2 · shares: These shares give effect to the Reporting Person's quarterly cash compensation for service on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

F2 · derivative.underlying_shares: These shares give effect to the Reporting Person's quarterly cash compensation for service on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000072 · wf-form4_153134829463580.xml · derivative · entry 3

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,393.7726

Underlying: Common Stock · 2 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F2 · shares: These shares give effect to the Reporting Person's quarterly cash compensation for service on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

F2 · derivative.underlying_shares: These shares give effect to the Reporting Person's quarterly cash compensation for service on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000072 · wf-form4_153134829463580.xml · derivative · entry 2

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,391.7726

Underlying: Common Stock · 505 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F2 · shares: These shares give effect to the Reporting Person's quarterly cash compensation for service on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

F2 · derivative.underlying_shares: These shares give effect to the Reporting Person's quarterly cash compensation for service on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000072 · wf-form4_153134829463580.xml · derivative · entry 1

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,886.7726

Underlying: Common Stock · 200 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F2 · shares: These shares give effect to the Reporting Person's quarterly cash compensation for service on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

F2 · derivative.underlying_shares: These shares give effect to the Reporting Person's quarterly cash compensation for service on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000070 · wf-form4_153090890825590.xml · nonDerivative · entry 1

RAKOWICH WALTER C · CIK 0001202432 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,324

F1 · kind: This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective as of August 16, 2016.

SEC source: 0001104659-18-044058 · a4.xml · derivative · entry 1

BAILEY CLARK H · CIK 0001183331 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,917.9059

Underlying: Common Stock · 612.7997 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F2 · shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

F2 · derivative.underlying_shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000067 · wf-form4_153083185784121.xml · derivative · entry 1

VERRECCHIA ALFRED J · CIK 0001214978 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,625.5683

Underlying: Common Stock · 540.7011 shares

Expires not disclosed

F1 · derivative.exercise_price: 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 June 14, 2018, 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.

F2 · shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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 June 14, 2018, 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.

F1 · derivative.expiration_date: 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 June 14, 2018, 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.

F2 · derivative.underlying_shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000068 · wf-form4_153083188934923.xml · derivative · entry 1

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,686.7726

Underlying: Common Stock · 306.7326 shares

Expires not disclosed

F1 · derivative.exercise_price: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan") with respect to certain restricted stock units ("RSUs") received on June 14, 2018, 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan") with respect to certain restricted stock units ("RSUs") received on June 14, 2018, 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F1 · derivative.expiration_date: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan") with respect to certain restricted stock units ("RSUs") received on June 14, 2018, 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · derivative.underlying_shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000066 · wf-form4_153083182988161.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,599.8637

Underlying: Common Stock · 523.4841 shares

Expires not disclosed

F1 · derivative.exercise_price: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan") with respect to certain restricted stock units ("RSUs") received on June 14, 2018, 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan") with respect to certain restricted stock units ("RSUs") received on June 14, 2018, 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F1 · derivative.expiration_date: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan") with respect to certain restricted stock units ("RSUs") received on June 14, 2018, 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · derivative.underlying_shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000090 · wf-form4a_153574591829241.xml · derivative · entry 1

VERRECCHIA ALFRED J · CIK 0001214978 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,625.5683

Underlying: Common Stock · 540.7011 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F2 · shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

F2 · derivative.underlying_shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000089 · wf-form4a_153574588247245.xml · derivative · entry 1

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,686.7726

Underlying: Common Stock · 306.7326 shares

Expires not disclosed

F1 · derivative.exercise_price: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F1 · derivative.expiration_date: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · derivative.underlying_shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

SEC source: 0001020569-18-000088 · wf-form4a_153574583979540.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,599.8637

Underlying: Common Stock · 523.4841 shares

Expires not disclosed

F1 · derivative.exercise_price: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

F1 · derivative.exercise_date: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F1 · derivative.expiration_date: 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2 · derivative.underlying_shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

SEC source: 0001104659-18-040908 · a4.xml · nonDerivative · entry 1

DENINGER PAUL F · CIK 0001190861 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 47,711

F1 · shares: Consists of shares issuable upon the settlement of restricted stock units ("RSUs") granted on June 14, 2018. The RSUs vest on the grant date.