IRM

SEC source: 0001566391-26-000006 · wk-form4_1771967173.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 38,474

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 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.

SEC source: 0001732058-26-000006 · wk-form4_1771967101.xml · nonDerivative · entry 1

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers & ALM

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 49,081

F1 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 20, 2025.

SEC source: 0001769841-26-000002 · wk-form4_1771453461.xml · derivative · entry 1

McIntosh Greg W · CIK 0001769841 · EVP, CCO & GM, Global RM

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 123,144

Underlying: Common Stock, par value $.01 per share · 87,960 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 ("Common Stock").

F2 · shares: The PUs were initially granted to the Reporting Person on March 1, 2023. This Form 4 is being filed to reflect the determination by the Compensation Committee, effective as of February 16, 2026, of the actual award of PUs under the grant after completion of the relevant performance period.

F3 · derivative.exercise_date: The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026.

F3 · derivative.expiration_date: The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026.

SEC source: 0001566391-26-000004 · wk-form4_1771462073.xml · derivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 650,674

Underlying: Common Stock, par value $.01 per share · 464,767 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 ("Common Stock").

F2 · shares: The PUs were initially granted to the Reporting Person on March 1, 2023. This Form 4 is being filed to reflect the determination by the Compensation Committee, effective as of February 16, 2026, of the actual award of PUs under the grant after completion of the relevant performance period.

F3 · derivative.exercise_date: The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026.

F3 · derivative.expiration_date: The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026.

SEC source: 0001732058-26-000004 · wk-form4_1771453367.xml · derivative · entry 1

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers & ALM

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 149,768

Underlying: Common Stock, par value $.01 per share · 106,977 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 ("Common Stock").

F2 · shares: The PUs were initially granted to the Reporting Person on March 1, 2023. This Form 4 is being filed to reflect the determination by the Compensation Committee, effective as of February 16, 2026, of the actual award of PUs under the grant after completion of the relevant performance period.

F3 · derivative.exercise_date: The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026.

F3 · derivative.expiration_date: The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026.

SEC source: 0001720656-26-000002 · wk-form4_1771453251.xml · derivative · entry 1

Borges Daniel · CIK 0001720656 · SVP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,152

Underlying: Common Stock, par value $.01 per share · 6,537 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 ("Common Stock").

F2 · shares: The PUs were initially granted to the Reporting Person on March 1, 2023. This Form 4 is being filed to reflect the determination by the Compensation Committee, effective as of February 16, 2026, of the actual award of PUs under the grant after completion of the relevant performance period.

F3 · derivative.exercise_date: The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026.

F3 · derivative.expiration_date: The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026.

SEC source: 0002045996-26-000002 · wk-form4_1771453103.xml · derivative · entry 2

Bhargava Mithu · CIK 0002045996 · EVP, GM Digital Business Unit

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 61,113

Underlying: Common Stock, par value $.01 per share · 43,652 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 ("Common Stock").

F4 · shares: The PUs were initially granted to the Reporting Person on July 3, 2023. This Form 4 is being filed to reflect the determination by the Compensation Committee, effective as of February 16, 2026, of the actual award of PUs under the grant after completion of the relevant performance period.

F5 · derivative.exercise_date: The PU were initially granted to the Reporting Person on July 3, 2023, and will fully vest on March 1, 2026.

F5 · derivative.expiration_date: The PU were initially granted to the Reporting Person on July 3, 2023, and will fully vest on March 1, 2026.

SEC source: 0002045996-26-000002 · wk-form4_1771453103.xml · derivative · entry 1

Bhargava Mithu · CIK 0002045996 · EVP, GM Digital Business Unit

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 51,919

Underlying: Common Stock, par value $.01 per share · 37,085 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 ("Common Stock").

F2 · shares: The PUs were initially granted to the Reporting Person on March 1, 2023. This Form 4 is being filed to reflect the determination by the Compensation Committee, effective as of February 16, 2026, of the actual award of PUs under the grant after completion of the relevant performance period.

F3 · derivative.exercise_date: The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026.

F3 · derivative.expiration_date: The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026.

SEC source: 0001613777-26-000002 · wk-form4_1771452938.xml · derivative · entry 1

Hytinen Barry · CIK 0001613777 · EVP and CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 232,977

Underlying: Common Stock, par value $.01 per share · 166,412 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 ("Common Stock").

F2 · shares: The PUs were initially granted to the Reporting Person on March 1, 2023. This Form 4 is being filed to reflect the determination by the Compensation Committee, effective as of February 16, 2026, of the actual award of PUs under the grant after completion of the relevant performance period.

F3 · derivative.exercise_date: The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026.

F3 · derivative.expiration_date: The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026.

SEC source: 0001781215-26-000006 · wk-form4_1769119506.xml · derivative · entry 2

Matlock Robin · CIK 0001781215 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 10.189 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_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: Settlement of the Phantom Shares is in Common Stock

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.

SEC source: 0001781215-26-000006 · wk-form4_1769119506.xml · nonDerivative · entry 1

Matlock Robin · CIK 0001781215 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,559.189

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: 0001020569-26-000004 · wk-form4_1767911391.xml · derivative · entry 1

Simons Doyle · CIK 0001185922 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,494.246

Underlying: Common Stock · 459.793 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.

F3 · price: The price reported in Column 8 is a weighted average price. These shares of Common Stock were acquired in multiple transactions at prices ranging from $84.304 to $84.979, inclusive. The Reporting Person undertakes to provide 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 acquired at each separate price within the ranges set forth in this footnote (3).

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.

SEC source: 0001020569-26-000002 · wk-form4_1767911345.xml · derivative · entry 2

Samuels Theodore R. II · CIK 0001688276 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,056.26

Underlying: Common Stock · 107.445 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.

F4 · shares: These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

F5 · price: The price reported in Column 8 is a weighted average price. These shares of Common Stock were acquired in multiple transactions at prices ranging from $84.304 to $84.979, inclusive. The Reporting Person undertakes to provide 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 acquired at each separate price within the ranges set forth in this footnote (5).

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.

SEC source: 0001020569-26-000002 · wk-form4_1767911345.xml · derivative · entry 1

Samuels Theodore R. II · CIK 0001688276 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,948.815

Underlying: Common Stock · 425.125 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 board of directors of the Company as if reinvested in Phantom Shares.

F3 · price: The price reported in Column 8 is a weighted average price. These shares of Common Stock were acquired in multiple transactions at prices ranging from $85.254 to $85.279, 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 acquired at each separate price within the ranges set forth in this footnote (3).

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.

SEC source: 0001781215-26-000004 · wk-form4_1767911178.xml · derivative · entry 1

Matlock Robin · CIK 0001781215 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10.189

Underlying: Common Stock · 10.189 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.

F3 · price: The price reported in Column 8 is a weighted average price. These shares of Common Stock were acquired in multiple transactions at prices ranging from $84.304 to $84.979, inclusive. The Reporting Person undertakes to provide 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 acquired at each separate price within the ranges set forth in this footnote (3).

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.

SEC source: 0001781215-26-000002 · wk-form4_1767741431.xml · derivative · entry 2

Matlock Robin · CIK 0001781215 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 998 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_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: Settlement of the Phantom Shares is in Common Stock.

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.

SEC source: 0001781215-26-000002 · wk-form4_1767741431.xml · nonDerivative · entry 1

Matlock Robin · CIK 0001781215 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,549

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: 0001732058-26-000002 · wk-form4_1767741394.xml · nonDerivative · entry 1

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers & ALM

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 55,081

F1 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 20, 2025.

SEC source: 0002052803-26-000002 · wk-form4_1767741348.xml · derivative · entry 3

Johns Jemma · CIK 0002052803 · EVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,819

Underlying: Common Stock, par value $.01 per share · 1,909 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 Common Stock.

F3 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 5,728 shares of Common Stock, were granted to the Reporting Person on January 2, 2025 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 5,728 shares of Common Stock, were granted to the Reporting Person on January 2, 2025 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0002052803-26-000002 · wk-form4_1767741348.xml · nonDerivative · entry 2

Johns Jemma · CIK 0002052803 · EVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 965

SEC source: 0002052803-26-000002 · wk-form4_1767741348.xml · nonDerivative · entry 1

Johns Jemma · CIK 0002052803 · EVP, CHRO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,909

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 January 2, 2025.

SEC source: 0002039171-26-000002 · wk-form4_1767741223.xml · derivative · entry 3

Altamura Michelle Vervais · CIK 0002039171 · EVP, General Counsel, Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,214

Underlying: Common Stock, par value $.01 per share · 1,214 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 Common Stock.

F3 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 3,642 shares of Common Stock, were granted to the Reporting Person on January 2, 2024 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 3,642 shares of Common Stock, were granted to the Reporting Person on January 2, 2024 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0002039171-26-000002 · wk-form4_1767741223.xml · nonDerivative · entry 2

Altamura Michelle Vervais · CIK 0002039171 · EVP, General Counsel, Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,752

SEC source: 0002039171-26-000002 · wk-form4_1767741223.xml · nonDerivative · entry 1

Altamura Michelle Vervais · CIK 0002039171 · EVP, General Counsel, Sec.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,221

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 January 2, 2024.

SEC source: 0001566391-26-000002 · wk-form4_1767741131.xml · derivative · entry 6

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 423,214

Underlying: Common Stock, par value $.01 per share · 38,482 shares

Expires 2027-02-16

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 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.

F5 · price: Not applicable.

F4 · derivative.exercise_date: This stock option, initially representing a right to purchase a total of 461,696 shares, is fully vested.

SEC source: 0001566391-26-000002 · wk-form4_1767741131.xml · nonDerivative · entry 3

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

F1 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.

F3 · price: The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $83.405 to $83.755, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (3).

SEC source: 0001566391-26-000002 · wk-form4_1767741131.xml · nonDerivative · entry 2

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 12,673

F1 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.

F2 · 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 $82.405 to $83.402, inclusive. The Reporting Person undertakes to provide Iron Mountain Incorporated (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (2).

SEC source: 0001566391-26-000002 · wk-form4_1767741131.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 38,482

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 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.

SEC source: 0001732058-25-000012 · wk-form4_1764803345.xml · nonDerivative · entry 1

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers & ALM

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 61,081

F1 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 20, 2025.

SEC source: 0001566391-25-000010 · wk-form4_1764803271.xml · derivative · entry 6

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.01 per share · 69,125 shares

Expires 2026-02-18

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 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 18, 2023.

F5 · price: Not applicable.

F4 · derivative.exercise_date: This stock option, initially representing a right to purchase a total of 829,506 shares, is fully vested.

SEC source: 0001566391-25-000010 · wk-form4_1764803271.xml · nonDerivative · entry 3

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

F1 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 18, 2023.

F3 · price: The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $83.730 to $84.570, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (3).

SEC source: 0001566391-25-000010 · wk-form4_1764803271.xml · nonDerivative · entry 2

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 10,569

F1 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 18, 2023.

F2 · 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 $82.730 to $83.720, inclusive. The Reporting Person undertakes to provide Iron Mountain Incorporated (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (2).

SEC source: 0001566391-25-000010 · wk-form4_1764803271.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 69,125

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 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 18, 2023.

SEC source: 0001020569-25-000210 · wk-form4_1763759111.xml · nonDerivative · entry 1

Kelly Christie B. · CIK 0001457703 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,308

SEC source: 0001732058-25-000010 · wk-form4_1762376997.xml · nonDerivative · entry 1

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers & ALM

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 67,081

F1 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 20, 2025.

SEC source: 0001566391-25-000008 · wk-form4_1762377112.xml · derivative · entry 6

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 69,125

Underlying: Common Stock, par value $.01 per share · 69,125 shares

Expires 2026-02-18

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 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 18, 2023.

F6 · derivative.exercise_date: This stock option, representing a right to purchase a total of 829,506 shares, is fully vested.

SEC source: 0001566391-25-000008 · wk-form4_1762377112.xml · nonDerivative · entry 4

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

F1 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 18, 2023.

F4 · price: The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $103.510 to $103.805, inclusive. The Reporting Person undertakes to provide 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 (4)

SEC source: 0001566391-25-000008 · wk-form4_1762377112.xml · nonDerivative · entry 3

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 10,828

F1 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 18, 2023.

F3 · price: The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $102.485 to $103.470, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (3).

SEC source: 0001566391-25-000008 · wk-form4_1762377112.xml · nonDerivative · entry 2

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 46,506

F1 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 18, 2023.

F2 · 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 $101.475 to $102.475, inclusive. The Reporting Person undertakes to provide Iron Mountain Incorporated (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (2).

SEC source: 0001566391-25-000008 · wk-form4_1762377112.xml · nonDerivative · entry 1

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 69,125

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 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 18, 2023.

SEC source: 0001732058-25-000008 · wk-form4_1762204150.xml · derivative · entry 3

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers & ALM

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock, par value $.01 per share · 7,306 shares

Expires 2026-03-09

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 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 20, 2025.

F2 · derivative.exercise_date: This stock option, representing a right to purchase a total of 7,306 shares, is fully vested.

SEC source: 0001732058-25-000008 · wk-form4_1762204150.xml · nonDerivative · entry 2

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers & ALM

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 73,081

F1 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 20, 2025.

SEC source: 0001732058-25-000008 · wk-form4_1762204150.xml · nonDerivative · entry 1

Kidd Mark · CIK 0001732058 · EVP, GM Data Centers & ALM

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 80,387

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 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 20, 2025.

SEC source: 0001020569-25-000199 · wk-form4_1761165394.xml · nonDerivative · entry 1

Kelly Christie B. · CIK 0001457703 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,275

F1 · shares: Consists of shares issuable upon the settlement of restricted stock units ("RSUs") granted on October 21, 2025. The RSUs vest in their entirety on the grant date.

SEC source: 0001020569-25-000191 · wk-form4_1759867965.xml · derivative · entry 2

Simons Doyle · CIK 0001185922 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 45,034.453

Underlying: Common Stock · 331.138 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.

F4 · shares: These shares give effect to the Reporting Person's quarterly cash compensation for services on the board of directors of the Company as if reinvested in Phantom Shares.

F5 · price: The price reported in Column 8 is a weighted average price. These shares of Common Stock were acquired in multiple transactions at prices ranging from $105.569 to $105.819, inclusive. The Reporting Person undertakes to provide 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 acquired at each separate price within the ranges set forth in this footnote (5).

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.

SEC source: 0001020569-25-000191 · wk-form4_1759867965.xml · derivative · entry 1

Simons Doyle · CIK 0001185922 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,703.315

Underlying: Common Stock · 333.553 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.

F3 · price: The price reported in Column 8 is a weighted average price. These shares of Common Stock were acquired in multiple transactions at prices ranging from $104.349 to $104.524, 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 acquired at each separate price within the ranges set forth in this footnote (3).

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.

SEC source: 0001020569-25-000189 · wk-form4_1759867860.xml · derivative · entry 2

Samuels Theodore R. II · CIK 0001688276 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,523.69

Underlying: Common Stock · 331.138 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.

F4 · shares: These shares give effect to the Reporting Person's quarterly cash compensation for services on the board of directors of the Company as if reinvested in Phantom Shares.

F5 · price: The price reported in Column 8 is a weighted average price. These shares of Common Stock were acquired in multiple transactions at prices ranging from $105.569 to $105.819, inclusive. The Reporting Person undertakes to provide 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 acquired at each separate price within the ranges set forth in this footnote (5).

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.

SEC source: 0001020569-25-000189 · wk-form4_1759867860.xml · derivative · entry 1

Samuels Theodore R. II · CIK 0001688276 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,192.552

Underlying: Common Stock · 76.052 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.

F3 · price: The price reported in Column 8 is a weighted average price. These shares of Common Stock were acquired in multiple transactions at prices ranging from $104.349 to $104.524, 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 acquired at each separate price within the ranges set forth in this footnote (3).

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.

SEC source: 0001781215-25-000007 · wk-form4_1759867755.xml · derivative · entry 1

Matlock Robin · CIK 0001781215 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 998

Underlying: Common Stock · 7.446 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.

F3 · price: The price reported in Column 8 is a weighted average price. These shares of Common Stock were acquired in multiple transactions at prices ranging from $104.349 to $104.524, 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 acquired at each separate price within the ranges set forth in this footnote (3).

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.

SEC source: 0001566391-25-000006 · wk-form4_1759521934.xml · derivative · entry 5

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

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 138,250

Underlying: Common Stock, par value $.01 per share · 69,125 shares

Expires 2026-02-18

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 · kind: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 18, 2023.

F5 · derivative.exercise_date: This stock option, representing a right to purchase a total of 829,506 shares, is fully vested.