Michelle Altamura - Mar 1, 2025 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Role: EVP, General Counsel, Sec.
Signature: /s/ Christine Zhang, under Power of Attorney dated September 17, 2024, from Michelle Altamura
Stock symbol: IRM
Transactions as of: Mar 1, 2025
Transactions value $: -$91,959
Form type: 4
Date filed: 3/4/2025, 06:43 PM
Previous filing: Jan 3, 2025
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	+1.07K	+35.43%	$0.00	4.11K	Mar 1, 2025	Direct	F1
transaction	IRM	Common Stock, par value $.01 per share	Tax liability	-$33.4K	-358	-8.72%	$93.17	3.75K	Mar 1, 2025	Direct
transaction	IRM	Common Stock, par value $.01 per share	Options Exercise	$0	+1.46K	+38.91%	$0.00	5.21K	Mar 1, 2025	Direct	F2
transaction	IRM	Common Stock, par value $.01 per share	Tax liability	-$45.3K	-486	-9.34%	$93.17	4.72K	Mar 1, 2025	Direct
transaction	IRM	Common Stock, par value $.01 per share	Options Exercise	$0	+431	+9.13%	$0.00	5.15K	Mar 1, 2025	Direct	F3
transaction	IRM	Common Stock, par value $.01 per share	Tax liability	-$13.3K	-143	-2.78%	$93.17	5.01K	Mar 1, 2025	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	-1.07K	-100%	$0.00	0	Mar 1, 2025	Common Stock	1.07K		Direct	F4, F5
transaction	IRM	Restricted Stock Units	Options Exercise	$0	-1.46K	-50%	$0.00	1.46K	Mar 1, 2025	Common Stock	1.46K		Direct	F4, F6
transaction	IRM	Restricted Stock Units	Options Exercise	$0	-431	-33.28%	$0.00	864	Mar 1, 2025	Common Stock	431		Direct	F4, F7
transaction	IRM	Restricted Stock Units	Award	$0	+3.22K		$0.00	3.22K	Mar 1, 2025	Common Stock	3.22K		Direct	F4, F8

* 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 full vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on March 1, 2022.
F2	This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on March 1, 2023.
F3	This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on March 1, 2024.
F4	Each restricted stock units ("RSUs") represents a contingent right to receive one share of Common Stock.
F5	The RSU, representing a contingent right to receive a total of 3,221 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.
F6	The RSUs, representing a contingent right to receive a total of 4,374 shares of Common Stock, were granted to the Reporting Person on March 1, 2023 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.
F7	The RSU, representing a contingent right to receive a total of 1,295 shares of Common Stock, were granted to the Reporting Person on March 1, 2024 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.
F8	The RSU, representing a contingent right to receive a total of 3,219 shares of Common Stock, were granted to the Reporting Person on March 1, 2025 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.