Walter C. Rakowich - 20 May 2026 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Reporting relationship: Director
Issuer ticker: IRM
Reported as of: 20 May 2026
Net transaction value: -$94,209
SEC form: 4
Accepted by SEC: 21 May 2026, 17:55:36 UTC
Prior SEC filing: 15 May 2026
Next SEC filing: 27 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Keely Stewart, under Power of Attorney dated April 17, 2023, from Walter C. Rakowich

Key filing fact

Walter C. Rakowich filed Form 4 for IRON MOUNTAIN INC (IRM) on 21 May 2026.

Key facts

This page summarizes Walter C. Rakowich's Form 4 filing for IRON MOUNTAIN INC (IRM).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 21 May 2026, 17:55.

Change

Previous filing in this sequence was filed on 15 May 2026.
Current net transaction value: -$94,209.

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 0001202432 Primary reporting owner

RAKOWICH WALTER C

Relationship: Director
Address: C/O IRON MOUNTAIN INCORPORATED, 85 NEW HAMPSHIRE AVENUE, SUITE 150, PORTSMOUTH
Signature: /s/ Keely Stewart, under Power of Attorney dated April 17, 2023, from Walter C. Rakowich
Signature date: 21 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

Sale

Transaction value: $94,209
Shares: -757
Change %: -40%
Price: $124.45
Shares after: 1,135
Date: 20 May 2026
Ownership: Direct
Footnotes: F1

IRM holding

Common Stock, par value $.01 per share

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 23,865
Date: 20 May 2026
Ownership: By Rakowich Living Trust
Footnotes: F2

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

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 2 footnotes

Footnote F1

The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 12, 2024.

Footnote F2

Shares held of record by Rakowich Living Trust. The reporting person is the sole trustee.