Iron Mountain EVP sells 6,000 shares at $115.60

EVP Mark Kidd sold 6,000 IRM shares under a pre-arranged Rule 10b5-1 trading plan, leaving him with 95,507 directly held shares.

Rhea-AI Filing Summary

IRON MOUNTAIN INC (IRM) executive Mark Kidd, EVP, GM Data Centers & ALM, reported selling 6,000 shares of common stock on September 1, 2026 at $115.60 per share in an open-market or private transaction. The sale was made under a Rule 10b5-1 trading plan adopted on March 20, 2025, and he now holds 95,507 shares directly.

Insider Trade Summary 10b5-1

Net Seller: 6,000 shares

Net Sell 1 txn

Insider Kidd Mark

Role EVP, GM Data Centers & ALM

Sold 6,000 shs ($694K)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $.01 per share F1	6,000	$115.60	$694K

Holdings After Transaction: Common Stock, par value $.01 per share — 95,507 shares (Direct)

Footnotes (1)

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

Key Figures

Shares sold: 6,000 shares Sale price per share: $115.60 per share Shares held after transaction: 95,507 shares +1 more

4 metrics

Shares sold 6,000 shares Common stock sale by Mark Kidd on September 1, 2026

Sale price per share $115.60 per share Price for the 6,000 IRM shares sold on September 1, 2026

Shares held after transaction 95,507 shares Directly held IRM common stock by Mark Kidd following the sale

Rule 10b5-1 plan adoption date March 20, 2025 Trading plan under which the September 1, 2026 sale was executed

Key Terms

Rule 10b5-1 trading plan, Common Stock, par value $.01 per share, open market or private transaction

3 terms

Rule 10b5-1 trading plan regulatory

"The transaction was made pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Common Stock, par value $.01 per share financial

"security title is Common Stock, par value $.01 per share"

open market or private transaction market

"transaction is described as a Sale in open market or private transaction"

FAQ

What insider transaction did IRM executive Mark Kidd report on this Form 4?

Mark Kidd reported a sale of 6,000 IRM common shares on September 1, 2026 in an open-market or private transaction at $115.60 per share, according to the Form 4.

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

After the reported transaction, Mark Kidd directly holds 95,507 shares of IRM common stock, as stated in the Form 4.

Was the IRM insider sale by Mark Kidd under a Rule 10b5-1 plan?

Yes. The filing states the transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Mark Kidd on March 20, 2025.

What price did Mark Kidd receive per IRM share in this transaction?

The Form 4 reports that Mark Kidd’s sale of 6,000 IRM common shares was executed at $115.60 per share.

What is Mark Kidd’s role at IRM mentioned in the Form 4?

The Form 4 identifies Mark Kidd as an officer of IRM with the title EVP, GM Data Centers & ALM.

Does the IRM Form 4 indicate buying or selling activity overall?

The Form 4 shows only selling activity, with one reported transaction: a net sale of 6,000 shares of IRM common stock.

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Available on EDGAR 09/02/2026 - 04:20 PM Accepted by SEC EDGAR 09/02/2026 - 04:20 PM Learn about SEC filing dates

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).

X

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 NEW HAMPSHIRE 03801

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/01/2026

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

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

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

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	09/01/2026		S(1)		6,000	D	$115.6	95,507	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	09/02/2026
	** 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.
* Form 4: SEC 1474 (03-26)