[Form 3] IRON MOUNTAIN INC Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Iron Mountain Incorporated (IRM) reported a Section 16 update: a company director filed a Form 3 initial statement of beneficial ownership effective 10/21/2025. The filing indicates no securities are beneficially owned.

The submission was filed by one reporting person and confirms the director role, with no non-derivative or derivative holdings listed.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Kelly Christie B.

(Last) (First) (Middle)

C/O IRON MOUNTAIN INCORPORATED

85 NEW HAMPSHIRE AVENUE, SUITE 150

(Street)

PORTSMOUTH NH 03801

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
10/21/2025

3. Issuer Name and Ticker or Trading Symbol
IRON MOUNTAIN INC [ IRM ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

No securities are beneficially owned.

	/s/ Christine Zhang, under Power of Attorney dated September 11, 2025, from Christie Kelly	10/22/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did IRM disclose in this Form 3 filing?

A company director filed an initial ownership statement and reported no securities beneficially owned.

What is the event date in IRM’s Form 3?

The event date is 10/21/2025.

What is the filer’s relationship to Iron Mountain (IRM)?

The reporting person is a Director of Iron Mountain Incorporated.

How many reporting persons are included in this filing for IRM?

The filing was made by one reporting person.

Does the Form 3 show any stock or derivative holdings for the IRM director?

No. It states No securities are beneficially owned and lists none in Tables I or II.

Which form type was filed by IRM’s insider?

A Form 3 (initial statement of beneficial ownership under Section 16).