Barry Hytinen - Mar 1, 2023 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Role: EVP and CFO
Signature: /s/ Elizabeth Tammaro, under Power of Attorney dated January 1, 2020, from Barry A. Hytinen
Stock symbol: IRM
Transactions as of: Mar 1, 2023
Transactions value $: -$367,114
Form type: 4
Date filed: 3/2/2023, 06:29 PM
Previous filing: Feb 27, 2023
Next filing: Jun 20, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	IRM	Common Stock, par value $.01 per share	Options Exercise	$0	+10.9K	+12.14%	$0.00	101K	Mar 1, 2023	Direct	F1
transaction	IRM	Common Stock, par value $.01 per share	Tax liability	-$251K	-4.78K	-4.75%	$52.58	95.9K	Mar 1, 2023	Direct
transaction	IRM	Common Stock, par value $.01 per share	Options Exercise	$0	+5.03K	+5.25%	$0.00	101K	Mar 1, 2023	Direct	F2
transaction	IRM	Common Stock, par value $.01 per share	Tax liability	-$116K	-2.21K	-2.19%	$52.58	98.7K	Mar 1, 2023	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	-10.9K	-50%	$0.00	10.9K	Mar 1, 2023	Common Stock	10.9K		Direct	F3, F4
transaction	IRM	Restricted Stock Units	Options Exercise	$0	-5.03K	-33.33%	$0.00	10.1K	Mar 1, 2023	Common Stock	5.03K		Direct	F3, F5

* 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 March 1, 2021.
F2	This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on March 1, 2022.
F3	Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").
F4	The RSUs, representing a contingent right to receive a total of 32,680 shares of Common Stock, were granted to the Reporting Person on March 1, 2021 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.
F5	The RSUs, representing a contingent right to receive a total of 15,099 shares of Common Stock, were granted to the Reporting Person on March 1, 2022 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.