IRM

SEC source: 0001104659-17-001952 · a4.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,651

F2 · kind: This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective as of April 29, 2016.

F3 · price: The price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.756 to $32.865, 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 sold at each separate price within the ranges set forth in this footnote (3).

SEC source: 0001104659-17-001952 · a4.xml · derivative · entry 4

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 34,081

Underlying: Common Stock · 17,039 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_price: Each RSU represents a contingent right to receive one share of the Company's common stock ("Common Stock").

F5 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 68,158 shares of Common Stock, were granted to the Reporting Person on January 7, 2013 and vest 25% on the third anniversary of the grant date, 25% on the fourth anniversary of the grant date and 50% on the fifth anniversary of the grant date. The number of RSUs granted includes previously reported RSUs allocated on November 4, 2014 in connection with the special distribution declared by the Board of Directors of the Company on September 15, 2014 and paid on November 4, 2014.

F5 · derivative.expiration_date: The RSUs, representing a contingent right to receive a total of 68,158 shares of Common Stock, were granted to the Reporting Person on January 7, 2013 and vest 25% on the third anniversary of the grant date, 25% on the fourth anniversary of the grant date and 50% on the fifth anniversary of the grant date. The number of RSUs granted includes previously reported RSUs allocated on November 4, 2014 in connection with the special distribution declared by the Board of Directors of the Company on September 15, 2014 and paid on November 4, 2014.

SEC source: 0001104659-17-001952 · a4.xml · nonDerivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 48,315

SEC source: 0001104659-17-001952 · a4.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 54,026

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 7, 2013.

SEC source: 0001104659-17-001547 · a4.xml · derivative · entry 3

RAKOWICH WALTER C · CIK 0001202432 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,080.5581

Underlying: Common Stock · 5,617.9945 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 ("Phantom Shares") are 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 (1) share of Common Stock.

F3 · shares: Settlement of the Phantom Shares is in an equivalent number of whole shares of Common Stock and cash in lieu of the issuance of a fractional share.

F1 · 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 ("Phantom Shares") are 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 (1) share of Common Stock.

F4 · derivative.exercise_date: Settlement of the Phantom Shares is made in accordance with distribution elections made by the Reporting Person or as otherwise provided in the Plan.

F4 · derivative.expiration_date: Settlement of the Phantom Shares is made in accordance with distribution elections made by the Reporting Person or as otherwise provided in the Plan.

SEC source: 0001104659-17-001547 · a4.xml · nonDerivative · entry 2

RAKOWICH WALTER C · CIK 0001202432 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,747

F2 · shares: Represents the fraction of a share of Common Stock otherwise issuable to the Reporting Person for which cash was paid in lieu of the issuance of a fractional share, based on the closing price of Common Stock on the New York Stock Exchange on the transaction date.

SEC source: 0001104659-17-001547 · a4.xml · nonDerivative · entry 1

RAKOWICH WALTER C · CIK 0001202432 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,747.9945

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 · 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 ("Phantom Shares") are 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 (1) share of Common Stock.

SEC source: 0001104659-17-000683 · a4.xml · derivative · entry 1

RAKOWICH WALTER C · CIK 0001202432 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,698.5526

Underlying: Common Stock · 161.5252 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 ("Phantom Shares") are 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 ("Phantom Shares") are 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 ("Phantom Shares") are payable in shares of Iron Mountain Incorporated common stock ("Common Stock") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

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

SEC source: 0001104659-17-000676 · a4.xml · derivative · entry 1

VERRECCHIA ALFRED J · CIK 0001214978 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,457.8226

Underlying: Common Stock · 423.9887 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: 0001104659-17-000680 · a4.xml · derivative · entry 1

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,750.0634

Underlying: Common Stock · 145.7283 shares

Expires not disclosed

F1 · derivative.exercise_price: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan"), the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

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

F1 · derivative.exercise_date: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan"), the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F1 · derivative.expiration_date: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan"), the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

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

SEC source: 0001104659-17-000675 · a4.xml · derivative · entry 1

BAILEY CLARK H · CIK 0001183331 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,361.7388

Underlying: Common Stock · 489.0068 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: 0001104659-17-000674 · a4.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,525.5876

Underlying: Common Stock · 408.4627 shares

Expires not disclosed

F1 · derivative.exercise_price: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan"), the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

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

F1 · derivative.exercise_date: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan"), the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F1 · derivative.expiration_date: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan"), the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

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

SEC source: 0001104659-16-164064 · a4.xml · nonDerivative · entry 1

DAUTEN KENT P · CIK 0001049128 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,000,000

F1 · price: The Reporting Person made a bona fide gift to a charitable organization.

SEC source: 0001104659-16-161550 · a4.xml · derivative · entry 1

MARSON DEBORAH · CIK 0001691591 · Exec.,VP,Gen.Counsel,Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,480

Underlying: Common Stock · 6,480 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 ("Common Stock").

F2 · 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.

F2 · 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: 0001104659-16-160660 · a4.xml · nonDerivative · entry 1

Chatfield Neil · CIK 0001670506 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By spouse

Disclosed balance after: 0

F1 · date: The reported transaction settled on the Australian Securities Exchange ("ASX") on December 2, 2016.

F2 · shares: Represents the Issuer's CHESS Depository Interests ("CDIs"), trading on ASX. Each CDI represents a beneficial interest in one share of the Issuer's common stock.

F3 · price: The price reported represents the weighted average sales price on ASX of AU$43.9087, as converted into U.S. dollars at the exchange rate of AU$1.00 to USD$0.7457, as in effect on December 2, 2016. Actual sales prices ranged from AU$43.9000 to AU$43.9600, inclusive, or US$32.7362 to US$32.7810. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of CDIs sold at each separate price within the range set forth in this footnote.

SEC source: 0001104659-16-153768 · a4.xml · nonDerivative · entry 5

Sweeney Eileen · CIK 0001639163 · Sr.VP,and GM,Data Management

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,020

F2 · kind: This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective as of September 8, 2016.

SEC source: 0001104659-16-153769 · a4.xml · derivative · entry 3

MacLean Theodore · CIK 0001620953 · Exec. VP, Chief MKTG Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,226

Underlying: Common Stock · 4,213 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 12,652 shares of Common Stock, were granted to the Reporting Person on October 28, 2014 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 12,652 shares of Common Stock, were granted to the Reporting Person on October 28, 2014 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001104659-16-153769 · a4.xml · nonDerivative · entry 2

MacLean Theodore · CIK 0001620953 · Exec. VP, Chief MKTG Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,683

SEC source: 0001104659-16-153769 · a4.xml · nonDerivative · entry 1

MacLean Theodore · CIK 0001620953 · Exec. VP, Chief MKTG Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,050

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 28, 2014.

SEC source: 0001104659-16-153768 · a4.xml · derivative · entry 7

Sweeney Eileen · CIK 0001639163 · Sr.VP,and GM,Data Management

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,544

Underlying: Common Stock · 5,272 shares

Expires not disclosed

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

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

F5 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 21,088 shares of Common Stock, were granted to the Reporting Person on October 28, 2014 and vest in four substantially equal annual installments beginning on the first anniversary of the grant date.

F5 · derivative.expiration_date: The RSUs, representing a contingent right to receive a total of 21,088 shares of Common Stock, were granted to the Reporting Person on October 28, 2014 and vest in four substantially equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001104659-16-153768 · a4.xml · derivative · entry 6

Sweeney Eileen · CIK 0001639163 · Sr.VP,and GM,Data Management

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,113

Underlying: Common Stock · 2,107 shares

Expires not disclosed

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

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

F4 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 6,326 shares of Common Stock, were granted to the Reporting Person on October 28, 2014 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

F4 · derivative.expiration_date: The RSUs, representing a contingent right to receive a total of 6,326 shares of Common Stock, were granted to the Reporting Person on October 28, 2014 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

SEC source: 0001104659-16-153768 · a4.xml · nonDerivative · entry 4

Sweeney Eileen · CIK 0001639163 · Sr.VP,and GM,Data Management

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,103

SEC source: 0001104659-16-153768 · a4.xml · nonDerivative · entry 3

Sweeney Eileen · CIK 0001639163 · Sr.VP,and GM,Data Management

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,729

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 28, 2014.

SEC source: 0001104659-16-153768 · a4.xml · nonDerivative · entry 2

Sweeney Eileen · CIK 0001639163 · Sr.VP,and GM,Data Management

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,457

SEC source: 0001104659-16-153768 · a4.xml · nonDerivative · entry 1

Sweeney Eileen · CIK 0001639163 · Sr.VP,and GM,Data Management

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,107

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 28, 2014.

SEC source: 0001104659-16-150967 · a4.xml · nonDerivative · entry 1

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 23,671

F1 · kind: This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective as of September 14, 2016.

SEC source: 0001104659-16-149362 · a4.xml · derivative · entry 3

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,604.3351

Underlying: Common Stock · 5,816.4447 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") are payable in shares of Iron Mountain Incorporated 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 (1) share of Iron Mountain Incorporated common stock ("Common Stock").

F3 · shares: Settlement of the Phantom Shares is in an equivalent number of whole shares of Common Stock and cash in lieu of the issuance of a fractional share.

F1 · 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") are payable in shares of Iron Mountain Incorporated 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 (1) share of Iron Mountain Incorporated common stock ("Common Stock").

F4 · derivative.exercise_date: Settlement of the Phantom Shares is made in accordance with distribution elections made by the Reporting Person or as otherwise provided in the Plan.

F4 · derivative.expiration_date: Settlement of the Phantom Shares is made in accordance with distribution elections made by the Reporting Person or as otherwise provided in the Plan.

SEC source: 0001104659-16-149362 · a4.xml · nonDerivative · entry 2

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,542

F2 · shares: Represents the fraction of a share of Common Stock otherwise issuable to the Reporting Person for which cash was paid in lieu of the issuance of a fractional share, based on the closing price of Common Stock on the New York Stock Exchange on the transaction date.

SEC source: 0001104659-16-149362 · a4.xml · nonDerivative · entry 1

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 26,542.4447

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 · 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") are payable in shares of Iron Mountain Incorporated 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 (1) share of Iron Mountain Incorporated common stock ("Common Stock").

SEC source: 0001104659-16-148672 · a4.xml · derivative · entry 1

RAKOWICH WALTER C · CIK 0001202432 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,537.0274

Underlying: Common Stock · 120.32 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 ("Phantom Shares") are 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 ("Phantom Shares") are 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 ("Phantom Shares") are payable in shares of Iron Mountain Incorporated common stock ("Common Stock") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

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

SEC source: 0001104659-16-148671 · a4.xml · derivative · entry 1

HALVORSEN KRIS · CIK 0001184214 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,420.7798

Underlying: Common Stock · 181.934 shares

Expires not disclosed

F1 · derivative.exercise_price: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan"), the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

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

F1 · derivative.exercise_date: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan"), the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F1 · derivative.expiration_date: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan"), the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

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

SEC source: 0001104659-16-148669 · a4.xml · derivative · entry 1

VERRECCHIA ALFRED J · CIK 0001214978 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,033.8339

Underlying: Common Stock · 315.829 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") 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 "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 "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: 0001104659-16-148667 · a4.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,117.1249

Underlying: Common Stock · 304.264 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") 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") 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") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

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

SEC source: 0001104659-16-148666 · a4.xml · derivative · entry 1

BAILEY CLARK H · CIK 0001183331 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,872.732

Underlying: Common Stock · 364.26 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") 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 "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 "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: 0001104659-16-144695 · a4.xml · derivative · entry 4

Bicks Edward · CIK 0001667756 · Sr. VP and Chief Strategy Ofc.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 2,782 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_price: Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").

F3 · kind: This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on September 10, 2013.

F5 · derivative.exercise_date: The RSUs, representing a contingent right to receive a total of 8,346 shares of Common Stock, were granted to the Reporting Person on September 10, 2013 and have vested in full in three substantially equal annual installments, the last of which was on September 12, 2016.

F5 · derivative.expiration_date: The RSUs, representing a contingent right to receive a total of 8,346 shares of Common Stock, were granted to the Reporting Person on September 10, 2013 and have vested in full in three substantially equal annual installments, the last of which was on September 12, 2016.

SEC source: 0001104659-16-144695 · a4.xml · nonDerivative · entry 3

Bicks Edward · CIK 0001667756 · Sr. VP and Chief Strategy Ofc.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,794

SEC source: 0001104659-16-144695 · a4.xml · nonDerivative · entry 2

Bicks Edward · CIK 0001667756 · Sr. VP and Chief Strategy Ofc.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,696

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 · kind: This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on September 10, 2013.

SEC source: 0001104659-16-144695 · a4.xml · nonDerivative · entry 1

Bicks Edward · CIK 0001667756 · Sr. VP and Chief Strategy Ofc.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 914

F1 · kind: This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective as of May 2, 2016.

F2 · shares: Represents 2,773 shares held by the The Edward T. Bicks Living Trust dated October 27, 2015, a living trust of which the Reporting Person is a co-trustee and a beneficiary, and retains the absolute right to make investment decisions.

SEC source: 0001104659-16-144696 · a4.xml · nonDerivative · entry 1

RAKOWICH WALTER C · CIK 0001202432 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,130

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