William L. Meaney - 16 Feb 2026 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Role: President and CEO, Director
Signature: /s/ Christine Zhang, under Power of Attorney dated February 27, 2025, from William Meaney
Issuer symbol: IRM
Transactions as of: 16 Feb 2026
Net transactions value: $0
Form type: 4
Filing time: 18 Feb 2026, 19:47:56 UTC
Previous filing: 06 Jan 2026
Next filing: 24 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Meaney William L	President and CEO, Director	C/O IRON MOUNTAIN INCORPORATED, 85 NEW HAMPSHIRE AVENUE, SUITE 150, PORTSMOUTH	/s/ Christine Zhang, under Power of Attorney dated February 27, 2025, from William Meaney	18 Feb 2026	0001566391

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	Award	$0	+464,767	+250%	$0.000000	650,674	16 Feb 2026	Common Stock, par value $.01 per share	464,767		Direct	F1, F2, F3

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

Explanation of Responses:

Id	Content
F1	Each Performance Unit ("PU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").
F2	The PUs were initially granted to the Reporting Person on March 1, 2023. This Form 4 is being filed to reflect the determination by the Compensation Committee, effective as of February 16, 2026, of the actual award of PUs under the grant after completion of the relevant performance period.
F3	The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026.