Jemma Johns - 02 Jan 2026 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Role: EVP, CHRO
Signature: /s/ Christine Zhang, under Power of Attorney dated January 14, 2025, from Jemma Johns
Issuer symbol: IRM
Transactions as of: 02 Jan 2026
Net transactions value: -$78,579
Form type: 4
Filing time: 06 Jan 2026, 18:15:52 UTC
Previous filing: 28 Feb 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Johns Jemma	EVP, CHRO	C/O IRON MOUNTAIN INCORPORATED, 85 NEW HAMPSHIRE AVENUE, SUITE 150, PORTSMOUTH	/s/ Christine Zhang, under Power of Attorney dated January 14, 2025, from Jemma Johns	06 Jan 2026	0002052803

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	+1,909		$0.000000	1,909	02 Jan 2026	Direct	F1
transaction	IRM	Common Stock, par value $.01 per share	Tax liability	$78,579	-944	-49%	$83.24	965	02 Jan 2026	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	-1,909	-33%	$0.000000	3,819	02 Jan 2026	Common Stock, par value $.01 per share	1,909		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 January 2, 2025.
F2	Each RSU represents a contingent right to receive one share of Common Stock.
F3	The RSUs, representing a contingent right to receive a total of 5,728 shares of Common Stock, were granted to the Reporting Person on January 2, 2025 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.