Greg W. McIntosh - 01 Mar 2026 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Reporting relationship: EVP, Chief Commercial Officer
Issuer ticker: IRM
Reported as of: 01 Mar 2026
Net transaction value: -$6,024,990
SEC form: 4
Accepted by SEC: 03 Mar 2026, 18:36:52 UTC
Prior SEC filing: 18 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ Christine Zhang, under Power of Attorney dated June 19, 2025, from Greg McIntosh

Key filing fact

Greg W. McIntosh filed Form 4 for IRON MOUNTAIN INC (IRM) on 03 Mar 2026.

Key facts

This page summarizes Greg W. McIntosh's Form 4 filing for IRON MOUNTAIN INC (IRM).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 03 Mar 2026, 18:36.

Change

Previous filing in this sequence was filed on 18 Feb 2026.
Current net transaction value: -$6,024,990.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001769841 Primary reporting owner

McIntosh Greg W

Relationship: EVP, Chief Commercial Officer
Address: C/O IRON MOUNTAIN INCORPORATED, 85 NEW HAMPSHIRE AVENUE, SUITE 150, PORTSMOUTH
Signature: /s/ Christine Zhang, under Power of Attorney dated June 19, 2025, from Greg McIntosh
Signature date: 03 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

IRM transaction

Common Stock, par value $.01 per share

Options Exercise

Transaction value: $0
Shares: +123,144
Change %: +680%
Price: $0.000000
Shares after: 141,251
Date: 01 Mar 2026
Ownership: Direct
Footnotes: F1

IRM transaction

Common Stock, par value $.01 per share

Tax liability

Transaction value: $6,024,990
Shares: -55,617
Change %: -39%
Price: $108.33
Shares after: 85,634
Date: 01 Mar 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

IRM transaction Derivative

Performance Units

Options Exercise

Transaction value: $0
Shares: -123,144
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 01 Mar 2026
Ownership: Direct
Underlying class: Common Stock, par value $.01 per share
Underlying amount: 123,144
Exercise price
Footnotes: F3, F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

This acquisition is reported to reflect the full vesting of performance units ("PUs") previously granted to the Reporting Person on March 1, 2023. Effective February 16, 2026, 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, 2026.

Footnote F2

Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding obligation in connection with the net settlement of the PUs and does not represent a sale.

Footnote F3

Each PU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").

Footnote F4

The PUs were initially granted to the Reporting Person on March 1, 2023. Effective as of February 16, 2026, the Compensation Committee determined the actual award of PUs under the grant after completion of the relevant performance period, and the PUs fully vested on March 1, 2026.