IRM

SEC source: 0001020569-20-000058 · wf-form4_158223368752344.xml · nonDerivative · entry 7

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,792

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 · shares: This acquisition is reported to reflect the full vesting of performance units ("PUs") previously granted to the Reporting Person on February 16, 2017. Effective February 13, 2020, the Compensation Committee of Iron Mountain Incorporated's Board of Directors (the "Compensation Committee") determined the actual award of PUs under the grant after completion of the relevant performance period, and the PUs vested in full on February 16, 2020.

SEC source: 0001020569-20-000058 · wf-form4_158223368752344.xml · nonDerivative · entry 6

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,605

SEC source: 0001020569-20-000058 · wf-form4_158223368752344.xml · nonDerivative · entry 5

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,094

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 · shares: This acquisition is reported to reflect the partial vesting of RSUs previously granted to the Reporting Person on February 15, 2018.

SEC source: 0001020569-20-000058 · wf-form4_158223368752344.xml · nonDerivative · entry 4

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,613

SEC source: 0001020569-20-000058 · wf-form4_158223368752344.xml · nonDerivative · entry 3

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,812

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 February 16, 2017.

SEC source: 0001020569-20-000058 · wf-form4_158223368752344.xml · nonDerivative · entry 2

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,134

SEC source: 0001020569-20-000058 · wf-form4_158223368752344.xml · nonDerivative · entry 1

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,618

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 February 16, 2017.

SEC source: 0001020569-20-000057 · wf-form4_158223364153400.xml · derivative · entry 10

Meaney William L · CIK 0001566391 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 71,293 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.

F9 · derivative.exercise_price: Each PU represents a contingent right to receive one share of Common Stock.

F10 · derivative.exercise_date: The PUs were initially granted to the Reporting Person on February 16, 2017. Effective February 13, 2020, the Compensation Committee determined the actual award of PUs under the grant after completion of the relevant performance period, and the PUs vested in full on February 16, 2020.

F10 · derivative.expiration_date: The PUs were initially granted to the Reporting Person on February 16, 2017. Effective February 13, 2020, the Compensation Committee determined the actual award of PUs under the grant after completion of the relevant performance period, and the PUs vested in full on February 16, 2020.

SEC source: 0001020569-20-000057 · wf-form4_158223364153400.xml · derivative · entry 9

Meaney William L · CIK 0001566391 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,515

Underlying: Common Stock · 24,442 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.

F6 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Common Stock.

F8 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 73,398 shares of Common Stock, were granted to the Reporting Person on February 15, 2018 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

F8 · derivative.expiration_date: The RSUs, representing a contingent right to receive a total of 73,398 shares of Common Stock, were granted to the Reporting Person on February 15, 2018 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001020569-20-000057 · wf-form4_158223364153400.xml · derivative · entry 8

Meaney William L · CIK 0001566391 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 18,280 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.

F6 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of Common Stock.

F7 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 54,729 shares of Common Stock, were granted to the Reporting Person on February 16, 2017 and have vested in full.

F7 · derivative.expiration_date: The RSUs, representing a contingent right to receive a total of 54,729 shares of Common Stock, were granted to the Reporting Person on February 16, 2017 and have vested in full.

SEC source: 0001020569-20-000057 · wf-form4_158223364153400.xml · nonDerivative · entry 7

Meaney William L · CIK 0001566391 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 181,860

F4 · shares: This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective as of June 7, 2019.

F5 · price: The price reported in Column 4 is a weighted average price. These shares of Iron Mountain Incorporated common stock ("Common Stock") were sold in multiple transactions at prices ranging from $33.825 to $34.135, 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 (5).

SEC source: 0001020569-20-000057 · wf-form4_158223364153400.xml · nonDerivative · entry 6

Meaney William L · CIK 0001566391 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 215,730

SEC source: 0001020569-20-000057 · wf-form4_158223364153400.xml · nonDerivative · entry 5

Meaney William L · CIK 0001566391 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 243,060

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 · shares: This acquisition is reported to reflect the full vesting of performance units ("PUs") previously granted to the Reporting Person on February 16, 2017. Effective February 13, 2020, the Compensation Committee of Iron Mountain Incorporated's Board of Directors (the "Compensation Committee") determined the actual award of PUs under the grant after completion of the relevant performance period, and the PUs vested in full on February 16, 2020.

SEC source: 0001020569-20-000057 · wf-form4_158223364153400.xml · nonDerivative · entry 4

Meaney William L · CIK 0001566391 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 171,767

SEC source: 0001020569-20-000057 · wf-form4_158223364153400.xml · nonDerivative · entry 3

Meaney William L · CIK 0001566391 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 182,607

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 · shares: This acquisition is reported to reflect the partial vesting of RSUs previously granted to the Reporting Person on February 15, 2018.

SEC source: 0001020569-20-000057 · wf-form4_158223364153400.xml · nonDerivative · entry 2

Meaney William L · CIK 0001566391 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 158,165

SEC source: 0001020569-20-000057 · wf-form4_158223364153400.xml · nonDerivative · entry 1

Meaney William L · CIK 0001566391 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 166,272

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 February 16, 2017.

SEC source: 0001020569-20-000039 · wf-form4_158207894864200.xml · derivative · entry 5

BAILEY CLARK H · CIK 0001183331 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 15,555 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.

F4 · derivative.exercise_date: This stock option, representing a right to purchase a total of 15,555 shares, is fully vested. The number of stock options granted includes previously reported adjustments effective on September 26, 2014 made in connection with the Special Distribution.

F4 · derivative.expiration_date: This stock option, representing a right to purchase a total of 15,555 shares, is fully vested. The number of stock options granted includes previously reported adjustments effective on September 26, 2014 made in connection with the Special Distribution.

SEC source: 0001020569-20-000039 · wf-form4_158207894864200.xml · nonDerivative · entry 2

BAILEY CLARK H · CIK 0001183331 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 151,594

F1 · price: The price reported in Column 4 is a weighted average price. These shares of Iron Mountain Incorporated common stock ("Common Stock") were sold in multiple transactions at prices ranging from $32.76 to $32.78, 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 (1).

SEC source: 0001020569-20-000039 · wf-form4_158207894864200.xml · nonDerivative · entry 1

BAILEY CLARK H · CIK 0001183331 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 167,149

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.

SEC source: 0001020569-20-000046 · wf-form4_158207925212375.xml · derivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,939

Underlying: Common Stock · 5,939 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Performance Unit ("PU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock.

F2 · shares: The PUs were initially granted to the Reporting Person on February 16, 2017. This Form 4 is being filed to reflect the determination by the Compensation Committee of Iron Mountain Incorporated's Board of Directors, effective as of February 13, 2020, of the actual award of PUs under the grant after completion of the relevant performance period.

F3 · derivative.exercise_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

F3 · derivative.expiration_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

SEC source: 0001020569-20-000047 · wf-form4_158207929165842.xml · derivative · entry 1

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,187

Underlying: Common Stock · 1,187 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Performance Unit ("PU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock.

F2 · shares: The PUs were initially granted to the Reporting Person on February 16, 2017. This Form 4 is being filed to reflect the determination by the Compensation Committee of Iron Mountain Incorporated's Board of Directors, effective as of February 13, 2020, of the actual award of PUs under the grant after completion of the relevant performance period.

F3 · derivative.exercise_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

F3 · derivative.expiration_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

SEC source: 0001020569-20-000045 · wf-form4_158207920171014.xml · derivative · entry 1

Borges Daniel · CIK 0001720656 · SVP & Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 527

Underlying: Common Stock · 527 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Performance Unit ("PU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock.

F2 · shares: The PUs were initially granted to the Reporting Person on February 16, 2017. This Form 4 is being filed to reflect the determination by the Compensation Committee of Iron Mountain Incorporated's Board of Directors, effective as of February 13, 2020, of the actual award of PUs under the grant after completion of the relevant performance period.

F3 · derivative.exercise_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

F3 · derivative.expiration_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

SEC source: 0001020569-20-000044 · wf-form4_158207916232252.xml · derivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,579

Underlying: Common Stock · 8,579 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Performance Unit ("PU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock.

F2 · shares: The PUs were initially granted to the Reporting Person on February 16, 2017. This Form 4 is being filed to reflect the determination by the Compensation Committee of Iron Mountain Incorporated's Board of Directors, effective as of February 13, 2020, of the actual award of PUs under the grant after completion of the relevant performance period.

F3 · derivative.exercise_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

F3 · derivative.expiration_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

SEC source: 0001020569-20-000042 · wf-form4_158207908073170.xml · derivative · entry 1

Meaney William L · CIK 0001566391 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 71,293

Underlying: Common Stock · 71,293 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Performance Unit ("PU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock.

F2 · shares: The PUs were initially granted to the Reporting Person on February 16, 2017. This Form 4 is being filed to reflect the determination by the Compensation Committee of Iron Mountain Incorporated's Board of Directors, effective as of February 13, 2020, of the actual award of PUs under the grant after completion of the relevant performance period.

F3 · derivative.exercise_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

F3 · derivative.expiration_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

SEC source: 0001020569-20-000043 · wf-form4_158207912363749.xml · derivative · entry 1

RUSSO FIDELMA · CIK 0001700118 · EVP, Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,052

Underlying: Common Stock · 10,052 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Performance Unit ("PU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock.

F2 · shares: The PUs were initially granted to the Reporting Person on February 16, 2017. This Form 4 is being filed to reflect the determination by the Compensation Committee of Iron Mountain Incorporated's Board of Directors, effective as of February 13, 2020, of the actual award of PUs under the grant after completion of the relevant performance period.

F3 · derivative.exercise_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

F3 · derivative.expiration_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

SEC source: 0001020569-20-000041 · wf-form4_158207903731708.xml · derivative · entry 1

Cloutier Ernest W · CIK 0001291613 · EVP & GM, RIM

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,900

Underlying: Common Stock · 9,900 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Performance Unit ("PU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock.

F2 · shares: The PUs were initially granted to the Reporting Person on February 16, 2017. This Form 4 is being filed to reflect the determination by the Compensation Committee of Iron Mountain Incorporated's Board of Directors, effective as of February 13, 2020, of the actual award of PUs under the grant after completion of the relevant performance period.

F3 · derivative.exercise_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

F3 · derivative.expiration_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

SEC source: 0001020569-20-000040 · wf-form4_158207899349695.xml · derivative · entry 1

Tomovcsik John · CIK 0001595956 · EVP, Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,239

Underlying: Common Stock · 9,239 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Performance Unit ("PU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock.

F2 · shares: The PUs were initially granted to the Reporting Person on February 16, 2017. This Form 4 is being filed to reflect the determination by the Compensation Committee of Iron Mountain Incorporated's Board of Directors, effective as of February 13, 2020, of the actual award of PUs under the grant after completion of the relevant performance period.

F3 · derivative.exercise_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

F3 · derivative.expiration_date: The PUs were initially granted to the Reporting Person on February 16, 2017 and fully vest on February 16, 2020.

SEC source: 0001020569-20-000022 · wf-form4_157903893510908.xml · derivative · entry 2

DENINGER PAUL F · CIK 0001190861 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 13,390 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.

F1 · derivative.exercise_date: This stock option, representing a right to purchase a total of 13,390 shares, is fully vested. The number of stock options granted includes previously reported adjustments effective on September 26, 2014 made in connection with the special distribution declared by the Board of Directors of Iron Mountain Incorporated on September 15, 2014 and paid on November 4, 2014.

F2 · derivative.expiration_date: Expiration date of the stock option is 9/15/2020.

SEC source: 0001020569-20-000022 · wf-form4_157903893510908.xml · nonDerivative · entry 1

DENINGER PAUL F · CIK 0001190861 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 66,161

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.

SEC source: 0001020569-20-000021 · wf-form4_157903885232693.xml · derivative · entry 1

Matlock Robin · CIK 0001781215 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 834.7993

Underlying: Common Stock · 834.7993 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 the Reporting Person's quarterly cash compensation for services 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 "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 the Reporting Person's quarterly cash compensation for services on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

SEC source: 0001020569-20-000019 · wf-form4_157903871293513.xml · derivative · entry 1

Simons Doyle · CIK 0001185922 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,866.7993

Underlying: Common Stock · 834.7993 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 services 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 services on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

SEC source: 0001020569-20-000014 · wf-form4_157835722042451.xml · derivative · entry 1

Simons Doyle · CIK 0001185922 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,032

Underlying: Common Stock · 2,032 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 January 2, 2020, 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.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 January 2, 2020, 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 January 2, 2020, 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.

SEC source: 0001104659-20-001726 · a4.xml · derivative · entry 2

Hytinen Barry · CIK 0001613777 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,883

Underlying: Common Stock · 32,883 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock.

F3 · derivative.exercise_date: The RSUs vest 50% on the second anniversary of the grant date and 50% on the third anniversary of the grant date.

F3 · derivative.expiration_date: The RSUs vest 50% on the second anniversary of the grant date and 50% on the third anniversary of the grant date.

SEC source: 0001104659-20-001726 · a4.xml · derivative · entry 1

Hytinen Barry · CIK 0001613777 · EVP and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,325

Underlying: Common Stock · 49,325 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock.

F2 · derivative.exercise_date: The RSUs vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

F2 · derivative.expiration_date: The RSUs vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001020569-20-000008 · wf-form4_157835478858158.xml · derivative · entry 1

VERRECCHIA ALFRED J · CIK 0001214978 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 46,337.9302

Underlying: Common Stock · 883.4878 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: 0001020569-20-000010 · wf-form4_157835488654744.xml · derivative · entry 1

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,635.6768

Underlying: Common Stock · 679.4375 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: 0001020569-20-000012 · wf-form4_157835498706819.xml · derivative · entry 1

BAILEY CLARK H · CIK 0001183331 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,130.838

Underlying: Common Stock · 974.9277 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: 0001020569-20-000006 · wf-form4_157835467928231.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,192.6928

Underlying: Common Stock · 861.6529 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: 0001020569-19-000227 · wf-form4_157610324820290.xml · derivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 2,165 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: 0001020569-19-000227 · wf-form4_157610324820290.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,331

SEC source: 0001020569-19-000227 · wf-form4_157610324820290.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,967

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 December 7, 2016.

SEC source: 0001020569-19-000226 · wf-form4_157610310847431.xml · nonDerivative · entry 2

Allerton Jennifer · CIK 0001618762 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,584

SEC source: 0001020569-19-000226 · wf-form4_157610310847431.xml · nonDerivative · entry 1

Allerton Jennifer · CIK 0001618762 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,484

SEC source: 0001020569-19-000215 · wf-form4_157168980466342.xml · derivative · entry 3

McIntosh Greg W · CIK 0001769841 · EVP, Strategic Accounts

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 833

Underlying: Common Stock · 830 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 restricted stock unit ("RSU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock.

F3 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 2,493 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 2,493 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: 0001020569-19-000215 · wf-form4_157168980466342.xml · nonDerivative · entry 2

McIntosh Greg W · CIK 0001769841 · EVP, Strategic Accounts

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 803

SEC source: 0001020569-19-000215 · wf-form4_157168980466342.xml · nonDerivative · entry 1

McIntosh Greg W · CIK 0001769841 · EVP, Strategic Accounts

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,251

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: 0001020569-19-000213 · wf-form4_157074113974922.xml · derivative · entry 1

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 34,956.2393

Underlying: Common Stock · 798.038 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 the Reporting Person's quarterly cash compensation for services 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 "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 the Reporting Person's quarterly cash compensation for services on the Iron Mountain Incorporated board of directors as if reinvested in Phantom Shares.

SEC source: 0001020569-19-000211 · wf-form4_157021941477361.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 44,331.0399

Underlying: Common Stock · 824.1718 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: 0001020569-19-000210 · wf-form4_157021938720933.xml · derivative · entry 1

BAILEY CLARK H · CIK 0001183331 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,155.9103

Underlying: Common Stock · 932.5196 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.