Robin Matlock - Jul 6, 2021 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Role: Director
Signature: /s/ Elizabeth Tammaro, under Power of Attorney dated June 20, 2019 from Robin Matlock
Stock symbol: IRM
Transactions as of: Jul 6, 2021
Transactions value $: $2,530
Form type: 4
Date filed: 7/8/2021, 04:20 PM
Previous filing: May 14, 2021
Next filing: Oct 8, 2021

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	IRM	Phantom Stock	Award	$2.53K	+59.5	+1.46%	$42.51	4.15K	Jul 6, 2021	Common Stock	59.5		Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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	These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

Content

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.

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