ANTENUCCI TED R

SEC source: 0001244482-26-000003 · wk-form4_1780344409.xml · nonDerivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 43,870

F1 · shares: Award of restricted stock units will vest in three equal installments on the first, second and third anniversaries of the grant date.

F2 · balance_after: On December 2, 2025, the Company effected a one-for-seven reverse stock split of its Common Stock (the "Reverse Stock Split"). The number of securities reported on this Form 4 has been adjusted to reflect the Reverse Stock Split.

SEC source: 0001482512-25-000101 · wk-form4_1750118776.xml · nonDerivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 254,934

SEC source: 0001482512-25-000071 · wk-form4_1747945356.xml · nonDerivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 165,248

F1 · shares: Award of restricted stock units will vest in three equal installments on the first, second and third anniversaries of the date of grant.

SEC source: 0001482512-24-000057 · wk-form4_1715976282.xml · nonDerivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 120,022

F1 · shares: Award of restricted stock units will vest in three equal installments on the first, second and third anniversaries of the date of grant.

SEC source: 0001482512-24-000008 · wk-form4_1704326817.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,772

Underlying: Common Stock, par value $0.01 · 11,994 shares

Expires not disclosed

F1 · security: Represents LTIP Units issued in lieu of the reporting person's 2023 annual cash retainer fees for service on the Company's board of directors. The LTIP Units were fully-vested upon their issuance on December 29, 2023.

F2 · security: LTIP Units are a class of limited partnership units in Hudson Pacific Properties, L.P. (the "Operating Partnership"), the operating partnership of Hudson Pacific Properties, Inc. (the "Company") and are granted pursuant to the Hudson Pacific Properties, Inc. and Hudson Pacific Properties, L.P. 2010 Incentive Award Plan. Initially, LTIP Units do not have full parity with common limited partnership units of the Operating Partnership ("Common Units") with respect to liquidating distributions. If such parity is reached, vested LTIP Units may be converted into an equal number of Common Units at any time thereafter, and, upon conversion, enjoy all the rights of Common Units. Common Units are redeemable for cash based on the fair market value of an equivalent number of shares of Common Stock, or, at the election of the Company, an equal number of shares of Common Stock, each subject to adjustment in the event of stock splits, specified extraordinary distributions or similar events.

F2 · derivative.exercise_price: LTIP Units are a class of limited partnership units in Hudson Pacific Properties, L.P. (the "Operating Partnership"), the operating partnership of Hudson Pacific Properties, Inc. (the "Company") and are granted pursuant to the Hudson Pacific Properties, Inc. and Hudson Pacific Properties, L.P. 2010 Incentive Award Plan. Initially, LTIP Units do not have full parity with common limited partnership units of the Operating Partnership ("Common Units") with respect to liquidating distributions. If such parity is reached, vested LTIP Units may be converted into an equal number of Common Units at any time thereafter, and, upon conversion, enjoy all the rights of Common Units. Common Units are redeemable for cash based on the fair market value of an equivalent number of shares of Common Stock, or, at the election of the Company, an equal number of shares of Common Stock, each subject to adjustment in the event of stock splits, specified extraordinary distributions or similar events.

F2 · price: LTIP Units are a class of limited partnership units in Hudson Pacific Properties, L.P. (the "Operating Partnership"), the operating partnership of Hudson Pacific Properties, Inc. (the "Company") and are granted pursuant to the Hudson Pacific Properties, Inc. and Hudson Pacific Properties, L.P. 2010 Incentive Award Plan. Initially, LTIP Units do not have full parity with common limited partnership units of the Operating Partnership ("Common Units") with respect to liquidating distributions. If such parity is reached, vested LTIP Units may be converted into an equal number of Common Units at any time thereafter, and, upon conversion, enjoy all the rights of Common Units. Common Units are redeemable for cash based on the fair market value of an equivalent number of shares of Common Stock, or, at the election of the Company, an equal number of shares of Common Stock, each subject to adjustment in the event of stock splits, specified extraordinary distributions or similar events.

F1 · derivative.exercise_date: Represents LTIP Units issued in lieu of the reporting person's 2023 annual cash retainer fees for service on the Company's board of directors. The LTIP Units were fully-vested upon their issuance on December 29, 2023.

F3 · derivative.expiration_date: The rights to convert LTIP Units into Common Units and redeem Common Units for cash or shares of Common Stock do not have expiration dates.

SEC source: 0001482512-23-000115 · wk-form4_1685478055.xml · nonDerivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 98,896

F1 · shares: Award of restricted stock units will vest in three equal installments on the first, second and third anniversaries of the date of grant.

SEC source: 0001482512-23-000006 · wf-form4_167279787129635.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,778

Underlying: Common Stock, par value $0.01 · 8,479 shares

Expires not disclosed

F1 · security: LTIP Units are a class of limited partnership units in Hudson Pacific Properties, L.P. (the "Operating Partnership"), the operating partnership of Hudson Pacific Properties, Inc. (the "Company") and are issued pursuant to the Hudson Pacific Properties, Inc. and Hudson Pacific Properties, L.P. 2010 Incentive Award Plan. Initially, LTIP Units do not have full parity with common limited partnership units of the Operating Partnership ("Common Units") with respect to liquidating distributions. If such parity is reached, vested LTIP Units may be converted into an equal number of Common Units at any time thereafter, and, upon conversion, enjoy all the rights of Common Units. Common Units are redeemable for cash based on the fair market value of an equivalent number of shares of Common Stock, or, at the election of the Company, an equal number of shares of Common Stock, each subject to adjustment in the event of stock splits, specified extraordinary distributions or similar events.

F2 · security: Represents LTIP Units issued in lieu of the reporting person's 2022 annual cash retainer fees for service on the Company's board of directors. The LTIP Units were fully-vested upon their issuance on December 29, 2022.

F1 · derivative.exercise_price: LTIP Units are a class of limited partnership units in Hudson Pacific Properties, L.P. (the "Operating Partnership"), the operating partnership of Hudson Pacific Properties, Inc. (the "Company") and are issued pursuant to the Hudson Pacific Properties, Inc. and Hudson Pacific Properties, L.P. 2010 Incentive Award Plan. Initially, LTIP Units do not have full parity with common limited partnership units of the Operating Partnership ("Common Units") with respect to liquidating distributions. If such parity is reached, vested LTIP Units may be converted into an equal number of Common Units at any time thereafter, and, upon conversion, enjoy all the rights of Common Units. Common Units are redeemable for cash based on the fair market value of an equivalent number of shares of Common Stock, or, at the election of the Company, an equal number of shares of Common Stock, each subject to adjustment in the event of stock splits, specified extraordinary distributions or similar events.

F1 · price: LTIP Units are a class of limited partnership units in Hudson Pacific Properties, L.P. (the "Operating Partnership"), the operating partnership of Hudson Pacific Properties, Inc. (the "Company") and are issued pursuant to the Hudson Pacific Properties, Inc. and Hudson Pacific Properties, L.P. 2010 Incentive Award Plan. Initially, LTIP Units do not have full parity with common limited partnership units of the Operating Partnership ("Common Units") with respect to liquidating distributions. If such parity is reached, vested LTIP Units may be converted into an equal number of Common Units at any time thereafter, and, upon conversion, enjoy all the rights of Common Units. Common Units are redeemable for cash based on the fair market value of an equivalent number of shares of Common Stock, or, at the election of the Company, an equal number of shares of Common Stock, each subject to adjustment in the event of stock splits, specified extraordinary distributions or similar events.

F2 · derivative.exercise_date: Represents LTIP Units issued in lieu of the reporting person's 2022 annual cash retainer fees for service on the Company's board of directors. The LTIP Units were fully-vested upon their issuance on December 29, 2022.

F3 · derivative.expiration_date: The rights to convert LTIP Units into Common Units and redeem Common Units for cash or shares of Common Stock do not have expiration dates.

SEC source: 0001482512-22-000109 · wf-form4_165333659653042.xml · nonDerivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 71,808

F1 · shares: Award of restricted stock units will vest in three equal installments on the first, second and third anniversaries of the date of grant.

SEC source: 0001482512-21-000109 · wf-form4_162189349675049.xml · nonDerivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 65,754

F1 · shares: Award of restricted stock units will vest in three equal installments on the first, second and third anniversaries of the date of grant.

SEC source: 0001482512-20-000144 · wf-form4_160945276712377.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,299

Underlying: Common Stock, par value $0.01 · 3,299 shares

Expires not disclosed

F1 · security: LTIP Units are a class of limited partnership units in Hudson Pacific Properties, L.P. (the "Operating Partnership"), the operating partnership of Hudson Pacific Properties, Inc. (the "Company") and are issued pursuant to the Hudson Pacific Properties, Inc. and Hudson Pacific Properties, L.P. 2010 Incentive Award Plan. Initially, LTIP Units do not have full parity with common limited partnership units of the Operating Partnership ("Common Units") with respect to liquidating distributions. If such parity is reached, vested LTIP Units may be converted into an equal number of Common Units at any time thereafter, and, upon conversion, enjoy all the rights of Common Units. Common Units are redeemable for cash based on the fair market value of an equivalent number of shares of Common Stock, or, at the election of the Company, an equal number of shares of Common Stock, each subject to adjustment in the event of stock splits, specified extraordinary distributions or similar events.

F2 · security: Represents LTIP Units issued in lieu of the reporting person's 2020 annual cash retainer fees for service on the Company's board of directors. The LTIP Units were fully-vested upon their issuance on December 29, 2020.

F1 · derivative.exercise_price: LTIP Units are a class of limited partnership units in Hudson Pacific Properties, L.P. (the "Operating Partnership"), the operating partnership of Hudson Pacific Properties, Inc. (the "Company") and are issued pursuant to the Hudson Pacific Properties, Inc. and Hudson Pacific Properties, L.P. 2010 Incentive Award Plan. Initially, LTIP Units do not have full parity with common limited partnership units of the Operating Partnership ("Common Units") with respect to liquidating distributions. If such parity is reached, vested LTIP Units may be converted into an equal number of Common Units at any time thereafter, and, upon conversion, enjoy all the rights of Common Units. Common Units are redeemable for cash based on the fair market value of an equivalent number of shares of Common Stock, or, at the election of the Company, an equal number of shares of Common Stock, each subject to adjustment in the event of stock splits, specified extraordinary distributions or similar events.

F1 · price: LTIP Units are a class of limited partnership units in Hudson Pacific Properties, L.P. (the "Operating Partnership"), the operating partnership of Hudson Pacific Properties, Inc. (the "Company") and are issued pursuant to the Hudson Pacific Properties, Inc. and Hudson Pacific Properties, L.P. 2010 Incentive Award Plan. Initially, LTIP Units do not have full parity with common limited partnership units of the Operating Partnership ("Common Units") with respect to liquidating distributions. If such parity is reached, vested LTIP Units may be converted into an equal number of Common Units at any time thereafter, and, upon conversion, enjoy all the rights of Common Units. Common Units are redeemable for cash based on the fair market value of an equivalent number of shares of Common Stock, or, at the election of the Company, an equal number of shares of Common Stock, each subject to adjustment in the event of stock splits, specified extraordinary distributions or similar events.

F2 · derivative.exercise_date: Represents LTIP Units issued in lieu of the reporting person's 2020 annual cash retainer fees for service on the Company's board of directors. The LTIP Units were fully-vested upon their issuance on December 29, 2020.

F3 · derivative.expiration_date: The rights to convert LTIP Units into Common Units and redeem Common Units for cash or shares of Common Stock do not have expiration dates.

SEC source: 0001482512-20-000084 · wf-form4_159260117149562.xml · nonDerivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 62,542

F1 · shares: Shares will vest in three equal installments on the first, second and third anniversaries of the date of grant.

SEC source: 0001020569-20-000117 · wf-form4_158637992408560.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 46,469.0207

Underlying: Common Stock · 1,276.3279 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: 0001482512-20-000044 · wf-form4_158379372884201.xml · nonDerivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 58,281

SEC source: 0001020569-20-000006 · wf-form4_157835467928231.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,192.6928

Underlying: Common Stock · 861.6529 shares

Expires not disclosed

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

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

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

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

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

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

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 44,331.0399

Underlying: Common Stock · 824.1718 shares

Expires not disclosed

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

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

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

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

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

SEC source: 0001020569-19-000183 · wf-form4_156235770285480.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 43,506.8681

Underlying: Common Stock · 841.9945 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: 0001482512-19-000092 · wf-form4_155908565655115.xml · nonDerivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,656

F1 · security: Shares will vest in three equal installments on the first, second and third anniversaries of the date of grant.

SEC source: 0001020569-19-000158 · wf-form4_155873231459407.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,664.8736

Underlying: Common Stock · 5,060 shares

Expires not disclosed

F1 · derivative.exercise_price: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan") with respect to certain restricted stock units ("RSUs") received on May 22, 2019, which RSUs vest on the grant date, the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F1 · derivative.exercise_date: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan") with respect to certain restricted stock units ("RSUs") received on May 22, 2019, which RSUs vest on the grant date, the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F1 · derivative.expiration_date: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan") with respect to certain restricted stock units ("RSUs") received on May 22, 2019, which RSUs vest on the grant date, the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

SEC source: 0001020569-19-000122 · wf-form4_155441673766361.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,604.8736

Underlying: Common Stock · 631.9165 shares

Expires not disclosed

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

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

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

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

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

SEC source: 0001020569-19-000006 · wf-form4_154689879392057.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,972.9571

Underlying: Common Stock · 684.5365 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: 0001482512-18-000120 · wf-form4_154163682426077.xml · nonDerivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 40,022

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

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,288.4206

Underlying: Common Stock · 613.0569 shares

Expires not disclosed

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

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

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

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

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

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

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,675.3637

Underlying: Common Stock · 75.5 shares

Expires not disclosed

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

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

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

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

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

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

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,599.8637

Underlying: Common Stock · 523.4841 shares

Expires not disclosed

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

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

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

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

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

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

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,599.8637

Underlying: Common Stock · 523.4841 shares

Expires not disclosed

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

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

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

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

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

SEC source: 0001104659-18-040899 · a4.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,076.3796

Underlying: Common Stock · 4,413 shares

Expires not disclosed

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

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

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

SEC source: 0001482512-18-000066 · wf-form4_152763399536368.xml · nonDerivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,758

SEC source: 0001020569-18-000045 · wf-form4_152287727102919.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,663.3796

Underlying: Common Stock · 541.6553 shares

Expires not disclosed

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

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

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

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

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

SEC source: 0001104659-18-000827 · a4.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,121.7243

Underlying: Common Stock · 460.9607 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: 0001104659-17-060924 · a4.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,660.7636

Underlying: Common Stock · 417.3832 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: 0001104659-17-043861 · a4.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,243.3804

Underlying: Common Stock · 455.5043 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: 0001482512-17-000062 · wf-form4_149574614498245.xml · nonDerivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,128

SEC source: 0001104659-17-035796 · a4.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 28,787.8761

Underlying: Common Stock · 3,879 shares

Expires not disclosed

F1 · derivative.exercise_price: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan") with respect to certain restricted stock units ("RSUs") received on May 24, 2017, which RSUs vest on the grant date, the shares of phantom stock (the "Phantom Shares") will become payable in shares of the Issuer's 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.exercise_date: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan") with respect to certain restricted stock units ("RSUs") received on May 24, 2017, which RSUs vest on the grant date, the shares of phantom stock (the "Phantom Shares") will become payable in shares of the Issuer's common stock ("Common Stock") on various dates selected by the Reporting Person or as otherwise provided in the Plan. Each Phantom Share is the economic equivalent of one share of Common Stock.

F1 · derivative.expiration_date: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the "Plan") with respect to certain restricted stock units ("RSUs") received on May 24, 2017, which RSUs vest on the grant date, the shares of phantom stock (the "Phantom Shares") will become payable in shares of the Issuer's 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: 0001104659-17-021712 · a4.xml · derivative · entry 1

ANTENUCCI TED R · CIK 0001244482 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,908.8761

Underlying: Common Stock · 383.2885 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: 0001104659-17-000674 · 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: 0001104659-16-148667 · 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.