Mark Kidd - 21 Feb 2023 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Role: EVP, GM Data Centers & ALM
Signature: /s/ Elizabeth Tammaro, under Power of Attorney dated February 13, 2018 from Mark Kidd
Issuer symbol: IRM
Transactions as of: 21 Feb 2023
Net transactions value: -$107,978
Form type: 4
Filing time: 23 Feb 2023, 16:00:29 UTC
Previous filing: 03 Mar 2022
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	+4,216	+12%	$0.000000	38,998	21 Feb 2023	Direct	F1
transaction	IRM	Common Stock, par value $.01 per share	Tax liability	$107,978	-2,131	-5.5%	$50.67	36,867	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	-4,216	-100%	$0.000000^*	0	21 Feb 2023	Common Stock	4,216		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 12,647 shares of Common Stock, were granted to the Reporting Person on February 19, 2020 and are fully vested.