Deborah Marson - Feb 21, 2023 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Role: EVP, General Counsel, Sec.
Signature: /s/ Elizabeth Tammaro, under Power of Attorney dated December 7, 2016, from Deborah Marson
Stock symbol: IRM
Transactions as of: Feb 21, 2023
Transactions value $: -$45,502
Form type: 4
Date filed: 2/23/2023, 04:07 PM
Previous filing: Jan 12, 2023
Next filing: Feb 27, 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	+3.33K	+7.27%	$0.00	49.1K	Feb 21, 2023	Direct	F1
transaction	IRM	Common Stock, par value $.01 per share	Tax liability	-$45.5K	-898	-1.83%	$50.67	48.2K	Feb 21, 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	-3.33K	-100%	$0.00^*	0	Feb 21, 2023	Common Stock	3.33K		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 February 19, 2020.
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 9,985 shares of Common Stock, were granted to the Reporting Person on February 19, 2020 and are fully vested.