Robin Matlock - 18 Jul 2022 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
Issuer symbol: IRM
Transactions as of: 18 Jul 2022
Net transactions value: +$2,137
Form type: 4
Filing time: 20 Jul 2022, 16:04:05 UTC
Previous filing: 02 Jun 2022
Next filing: 02 Sep 2022
SEC: View on sec.gov

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	$2,137	+43	+1.2%	$49.50	3,498	18 Jul 2022	Common Stock	43		Direct	F1, F2, F3

* 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.
F3	Includes a reduction of -3.8214 Phantom Shares to reconcile total beneficial ownership from prior reported transactions.