Theodore R. Samuels II - 06 Oct 2026 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Reporting relationship: Director
Issuer ticker: IRM
Reported as of: 06 Oct 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 08 Oct 2026, 16:10:23 UTC
Prior SEC filing: 05 Oct 2026
Source filing: View source filing
Reporting owner signature: /s/ Keely Stewart, under Power of Attorney dated July 6, 2023 from Theodore R Samuels

Filing notes and source

Key filing fact

Theodore R. Samuels II filed Form 4 for IRON MOUNTAIN INC (IRM) on 08 Oct 2026.

Key facts

This page summarizes Theodore R. Samuels II's Form 4 filing for IRON MOUNTAIN INC (IRM).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 08 Oct 2026, 16:10.

Change

Previous filing in this sequence was filed on 05 Oct 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 0001688276 Primary reporting owner

Samuels Theodore R. II

Relationship: Director
Address: C/O IRON MOUNTAIN INCORPORATED, 85 NEW HAMPSHIRE AVENUE, SUITE 150, PORTSMOUTH
Signature: /s/ Keely Stewart, under Power of Attorney dated July 6, 2023 from Theodore R Samuels
Signature date: 08 Oct 2026

Reported derivative securities

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

IRM transaction Derivative

Phantom Stock

Award

Transaction value
Shares: +310
Change %: +2.2%
Price: $116.75^*
Shares after: 14,215
Date: 06 Oct 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 310
Exercise price
Footnotes: F1, 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

Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") following the Reporting Person's disability or cessation of service as a director. Each Phantom Share is the economic equivalent of one share of Common Stock.

Footnote F2

These shares give effect to the Reporting Person's quarterly cash compensation for services on the board of directors of the Company as if reinvested in Phantom Shares.