Iron Mountain EVP Kidd sells 6,000 shares

Iron Mountain Inc. executive Mark Kidd reported an open-market sale of company stock.

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Rhea-AI Filing Summary

Iron Mountain Inc. executive Mark Kidd reported an open-market sale of company stock. As EVP, GM Data Centers & ALM, he sold 6,000 shares of common stock at a price of $108.17 per share on February 20, 2026, in a planned transaction under a Rule 10b5-1 trading plan adopted on March 20, 2025. After this sale, he directly owns 49,081 Iron Mountain shares.

Insider Trade Summary

Net Seller: 6,000 shares

Net Sell 1 txn

Insider Kidd Mark

Role EVP, GM Data Centers & ALM

Sold 6,000 shs ($649K)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $.01 per share	6,000	$108.17	$649K

Holdings After Transaction: Common Stock, par value $.01 per share — 49,081 shares (Direct)

Footnotes (1)

F1. The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 20, 2025.

FAQ

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What did Iron Mountain (IRM) executive Mark Kidd report in this Form 4?

Mark Kidd reported an open-market sale of Iron Mountain common stock. He sold 6,000 shares on February 20, 2026, at $108.17 per share, as disclosed in the Form 4 insider trading report.

How many Iron Mountain (IRM) shares did Mark Kidd sell and at what price?

Mark Kidd sold 6,000 shares of Iron Mountain common stock at $108.17 per share. The transaction was an open-market sale and is classified as a non-derivative transaction in the Form 4 filing.

How many Iron Mountain (IRM) shares does Mark Kidd hold after this transaction?

After the reported sale, Mark Kidd directly owns 49,081 Iron Mountain shares. This post-transaction holding figure is disclosed in the Form 4 as the total shares beneficially owned following the open-market sale.

Was Mark Kidd’s Iron Mountain (IRM) stock sale under a Rule 10b5-1 plan?

Yes. The footnote states the sale was made under a Rule 10b5-1 trading plan. This plan was adopted by Mark Kidd on March 20, 2025, and governed the February 20, 2026 stock sale.

What role does Mark Kidd hold at Iron Mountain (IRM)?

Mark Kidd is an officer of Iron Mountain, serving as EVP, GM Data Centers & ALM. His position and title are disclosed in the Form 4 as part of the reporting person information section.

Is Mark Kidd’s ownership in Iron Mountain (IRM) direct or indirect after the sale?

His ownership is reported as direct following the transaction. The Form 4 classifies his nature of ownership with the code "D" for direct, indicating he directly holds the 49,081 Iron Mountain shares.

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Accepted by SEC EDGAR 02/24/2026 - 04:05 PM EST

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).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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

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)
02/20/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock, par value $.01 per share	02/20/2026		S⁽¹⁾		6,000	D	$108.17	49,081	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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	02/24/2026
	** 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.

Source: View Original Filing on SEC EDGAR