Robin Matlock - 29 May 2025 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Role: Director
Signature: /s/ Keely Stewart, under Power of Attorney dated April 17, 2023 from Robin Matlock
Issuer symbol: IRM
Transactions as of: 29 May 2025
Net transactions value: $0
Form type: 4
Filing time: 02 Jun 2025, 16:21:16 UTC
Previous filing: 05 May 2025
Next filing: 03 Jun 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Matlock Robin	Director	C/O IRON MOUNTAIN INCORPORATED, 85 NEW HAMPSHIRE AVENUE, SUITE 150, PORTSMOUTH	/s/ Keely Stewart, under Power of Attorney dated April 17, 2023 from Robin Matlock	02 Jun 2025	0001781215

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	IRM	Common Stock, par value $.01 per share	Award	$0	+2,249	+8.9%	$0.000000	27,551	29 May 2025	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Consists of shares issuable upon the settlement of restricted stock units ("RSUs") granted on May 29, 2025. The RSUs vest in their entirety on the grant date.