[Form 4] IRON MOUNTAIN INC Insider Trading Activity

Rhea-AI Filing Summary

Mark Kidd, an officer and director at Iron Mountain Inc. (IRM), reported a sale of 6,000 shares of the company's common stock on 10/01/2025 at a price of $101.63 per share. The Form 4 shows the sale was executed under a pre-established Rule 10b5-1 trading plan adopted on March 20, 2025. After the transaction, the reporting person beneficially owned 73,081 shares, held directly. The filing was signed under power of attorney on 10/03/2025. The form contains no derivative transactions or additional amendments.

Positive

• Sale executed under a Rule 10b5-1 plan, indicating a pre-planned transaction
• Post-sale ownership disclosed: 73,081 shares, providing clear ownership transparency

Negative

• Officer disposed of 6,000 shares, reducing insider equity exposure
• No disclosure of additional derivative purchases to offset the sale

Insights

Insider-Transactions Analyst

Officer sold 6,000 IRM shares under a 10b5-1 plan.

The sale of 6,000 shares at $101.63 was part of a pre-set 10b5-1 trading plan adopted on March 20, 2025, which generally indicates the transaction was scheduled in advance rather than reflecting contemporaneous insider information.

Post-transaction ownership stands at 73,081 shares, reported as direct ownership; the filing lists no options or other derivative activity, limiting additional insider exposure signals.

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Kidd Mark

(Last) (First) (Middle)

C/O IRON MOUNTAIN INCORPORATED

85 NEW HAMPSHIRE AVENUE, SUITE 150

(Street)

PORTSMOUTH NH 03801

(City) (State) (Zip)

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, GM Data Centers & ALM

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2025

4. 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, par value $.01 per share	10/01/2025		S(1)		6,000	D	$101.63	73,081	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 20, 2025.

Remarks:

	/s/ Christine Zhang, under Power of Attorney dated June 19, 2025, from Mark Kidd	10/03/2025
	** 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 4 (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 Iron Mountain (IRM) insider Mark Kidd report on Form 4?

Mark Kidd reported selling 6,000 shares of IRM common stock on 10/01/2025 at $101.63 per share under a 10b5-1 trading plan.

How many IRM shares does Mark Kidd own after the reported sale?

73,081 shares of Iron Mountain common stock are reported as beneficially owned following the transaction.

When was the 10b5-1 trading plan adopted for the reported sale?

The Form 4 states the 10b5-1 plan was adopted on March 20, 2025.

Was the Form 4 signed by Mark Kidd?

The filing was signed under power of attorney by Christine Zhang on 10/03/2025 per the document.

Does the Form 4 show any derivative transactions for IRM?

No. The filing includes only a non-derivative sale of common stock and shows no derivative securities reported.