IRON MOUNTAIN INC — Director's Dealing 2025

Nov 5, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IRON MOUNTAIN INC (IRM)
CIK: 0001020569
Period of Report: 2025-11-03

Reporting Person: Meaney William L (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-11-03	Common Stock, par value $.01 per share	M	69125	$36.588	Acquired	69125	Direct
2025-11-03	Common Stock, par value $.01 per share	S	22619	$102.02	Disposed	46506	Direct
2025-11-03	Common Stock, par value $.01 per share	S	35678	$102.922	Disposed	10828	Direct
2025-11-03	Common Stock, par value $.01 per share	S	10828	$103.689	Disposed	0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-11-03	Employee Stock Option (Right to Buy)	$36.588	M	69125	Disposed	2026-02-18	Common Stock, par value $.01 per share (69125)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock, par value $.01 per share	295650	Indirect

Footnotes

F1: The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 18, 2023.

F2: The price reported in Column 4 is a weighted average price. These shares of Iron Mountain Incorporated common stock ("Common Stock") were sold in multiple transactions at prices ranging from $101.475 to $102.475, inclusive. The Reporting Person undertakes to provide Iron Mountain Incorporated (the "Company"), any security holder of the Company, or the staff of the Securities and
Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (2).

F3: The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $102.485 to $103.470, inclusive. The Reporting
Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of
Common Stock sold at each separate price within the ranges set forth in this footnote (3).

F4: The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $103.510 to $103.805, inclusive. The Reporting
Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of
Common Stock sold at each separate price within the ranges set forth in this footnote (4)

F5: Balance reflects 295,650 shares transferred from the Grantor for funding of a Grantor Retained Annuity Trust on November 29, 2024. This transfer is exempt from Section 16 pursuant to Rule 16a-13.

F6: This stock option, representing a right to purchase a total of 829,506 shares, is fully vested.