H. Bailey - Jul 1, 2025 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Role
Director
Signature
/s/ Christine Zhang, under Power of Attorney dated May 12, 2025, from Clarke H. Bailey
Stock symbol
IRM
Transactions as of
Jul 1, 2025
Transactions value $
$0
Form type
4
Date filed
7/3/2025, 04:23 PM
Previous filing
Apr 7, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
BAILEY CLARK H Director 9 CLUB WAY, NEW ROCHELLE /s/ Christine Zhang, under Power of Attorney dated May 12, 2025, from Clarke H. Bailey 2025-07-03 0001183331

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction IRM Common Stock Options Exercise $0 +90.9K +59.94% $0.00 242K Jul 1, 2025 Direct F1
holding IRM Common Stock, par value $.01 per share 12.4K Jul 1, 2025 See footnote F2
holding IRM Common Stock, par value $.01 per share 12.4K Jul 1, 2025 See footnote F3

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction IRM Phantom Stock Options Exercise $0 -90.9K -100% $0.00 0 Jul 1, 2025 Common Stock 90.9K Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

H. Bailey is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may continue.

Explanation of Responses:

Id Content
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. The Reporting Person ceased service as a director effective May 29, 2025.
F2 Shares held by the Clarke H. Bailey GST Trust for the benefit of Trent S. Bailey.
F3 Shares held by the Clarke H. Bailey GST Trust for the benefit of Turner H. Bailey.