Jennifer Allerton - 07 May 2026 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Reporting relationship: Director
Issuer ticker: IRM
Reported as of: 07 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 11 May 2026, 16:39:37 UTC
Prior SEC filing: 03 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Christine Zhang, under Power of Attorney dated June 19, 2025, from Jennifer Allerton

Key filing fact

Jennifer Allerton filed Form 4 for IRON MOUNTAIN INC (IRM) on 11 May 2026.

Key facts

This page summarizes Jennifer Allerton's Form 4 filing for IRON MOUNTAIN INC (IRM).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 11 May 2026, 16:39.

Change

Previous filing in this sequence was filed on 03 Mar 2026.
Current net transaction value: $0.

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 0001618762 Primary reporting owner

Allerton Jennifer

Relationship: Director
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 Jennifer Allerton
Signature date: 11 May 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

Award

Transaction value
Shares: +1,892
Change %: +16%
Price: $0.000000^*
Shares after: 13,433
Date: 07 May 2026
Ownership: Direct
Footnotes: F1

IRM transaction

Common Stock, par value $.01 per share

Tax liability

Transaction value
Shares: -133
Change %: -0.99%
Price: $126.81^*
Shares after: 13,300
Date: 07 May 2026
Ownership: Direct
Footnotes: F2

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Consists of shares issuable upon the settlement of restricted stock units ("RSUs") granted on May 7, 2026. The RSUs vest in their entirety on the grant date.

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 RSUs and does not represent a sale.