DEBORAH MARSON - 21 Feb 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
Issuer symbol: IRM
Transactions as of: 21 Feb 2023
Net transactions value: -$45,502
Form type: 4
Filing time: 23 Feb 2023, 16:07:26 UTC
Previous filing: 12 Jan 2023
Next filing: 27 Feb 2023
SEC: View on sec.gov

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	+3,329	+7.3%	$0.000000	49,111	21 Feb 2023	Direct	F1
transaction	IRM	Common Stock, par value $.01 per share	Tax liability	$45,502	-898	-1.8%	$50.67	48,213	21 Feb 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	-3,329	-100%	$0.000000^*	0	21 Feb 2023	Common Stock	3,329		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.