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

Role: EVP, GM Data Centers & ALM
Signature: /s/ Keely Stewart, under Power of Attorney dated April 17, 2023, from Mark Kidd
Stock symbol: IRM
Transactions as of: Mar 1, 2025
Transactions value $: -$2,202,166
Form type: 4
Date filed: 3/4/2025, 08:47 PM
Previous filing: Feb 18, 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	+55K	+87.32%	$0.00	118K	Mar 1, 2025	Direct	F1
transaction	IRM	Common Stock, par value $.01 per share	Tax liability	-$2.1M	-22.5K	-19.07%	$93.17	95.4K	Mar 1, 2025	Direct
transaction	IRM	Common Stock, par value $.01 per share	Options Exercise	$0	+2.82K	+2.95%	$0.00	98.2K	Mar 1, 2025	Direct	F2
transaction	IRM	Common Stock, par value $.01 per share	Tax liability	-$107K	-1.15K	-1.17%	$93.17	97.1K	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	Performance Units	Options Exercise	$0	-55K	-100%	$0.00	0	Mar 1, 2025	Common Stock, par value $.01 per share	55K		Direct	F3, F4
transaction	IRM	Restricted Stock Units	Options Exercise	$0	-2.82K	-100%	$0.00	0	Mar 1, 2025	Common Stock, par value $.01 per share	2.82K		Direct	F5, F6

* 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 performance units ("PUs") previously granted to the Reporting Person on March 1, 2022. Effective February 14, 2025, the Compensation Committee of Iron Mountain Incorporated's Board of Directors determined the actual award of PUs under the grant after completion of the relevant performance period, and the PUs fully vested on March 1, 2025.
F2	This acquisition is reported to reflect the full vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on March 1, 2022.
F3	Each PU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").
F4	The PU were initially granted to the Reporting Person on March 1, 2022, and will fully vest on March 1, 2025.
F5	Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").
F6	The RSUs, representing a contingent right to receive a total of 8,455 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.