Edward Baker-Greene - Jan 4, 2022 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Role: EVP, CHRO
Signature: /s/ Elizabeth Tammaro, under Power of Attorney dated December 18, 2020, from Edward Greene
Stock symbol: IRM
Transactions as of: Jan 4, 2022
Transactions value $: -$137,228
Form type: 4
Date filed: 1/6/2022, 03:34 PM
Next filing: Mar 3, 2022

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	IRM	Common Stock	Options Exercise	$0	+8.72K		$0.00	8.72K	Jan 4, 2022	Direct	F1
transaction	IRM	Common Stock	Tax liability	-$137K	-2.7K	-31%	$50.75	6.02K	Jan 4, 2022	Direct

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	Restricted Stock Units	Options Exercise	$0	-8.72K	-33.33%	$0.00	17.4K	Jan 4, 2022	Common Stock	8.72K		Direct	F2, F3

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

Explanation of Responses:

Id	Content
F1	This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on January 4, 2021.
F2	Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").
F3	The RSUs, representing a contingent right to receive a total of 26,168 shares of Common Stock, were granted to the Reporting Person on January 4, 2021 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.