Iron Mountain (IRM) EVP Mark Kidd sells 6,000 shares under 10b5-1 plan

Rhea-AI Filing Summary

Iron Mountain Inc. executive vice president Mark Kidd reported an open-market sale of 6,000 shares of common stock at $126.70 per share. The transaction was executed under a pre-arranged Rule 10b5-1 trading plan. After this sale, he directly holds 113,507 Iron Mountain shares.

Insider Trade Summary 10b5-1

Net Seller: 6,000 shares ($760,200)

Net Sell 1 txn

Insider Kidd Mark

Role EVP, GM Data Centers & ALM

Sold 6,000 shs ($760K)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $.01 per share	6,000	$126.70	$760K

Holdings After Transaction: Common Stock, par value $.01 per share — 113,507 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares sold: 6,000 shares Sale price: $126.70 per share Shares held after sale: 113,507 shares +1 more

4 metrics

Shares sold 6,000 shares Open-market sale on June 1, 2026

Sale price $126.70 per share Common Stock, par value $0.01 per share

Shares held after sale 113,507 shares Direct ownership following transaction

Net share change -6,000 shares Net selling activity in this Form 4

Key Terms

Rule 10b5-1 trading plan, open-market sale, Common Stock, par value $.01 per share, Form 4

4 terms

Rule 10b5-1 trading plan financial

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

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.

open-market sale financial

"transaction_action: open-market sale"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Common Stock, par value $.01 per share financial

"security_title: Common Stock, par value $.01 per share"

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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Form 4 Insider Transactions: What Each Field Means →

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)
06/01/2026

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	06/01/2026		S(1)		6,000	D	$126.7	113,507	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	06/02/2026
	** 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)

FAQ

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

Mark Kidd reported selling 6,000 shares of Iron Mountain common stock in an open-market transaction at $126.70 per share. This filing discloses his recent trading activity and updates his remaining direct ownership position in the company’s stock.

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 a price of $126.70 per share. The transaction involved common stock with a par value of $0.01 per share and was executed as an open-market sale.

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

After the reported sale, Mark Kidd directly holds 113,507 shares of Iron Mountain common stock. This figure reflects his updated ownership position following the disposition of 6,000 shares in the open market on the reported transaction date.

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

Yes. The filing notes the sale was made pursuant to a Rule 10b5-1 trading plan adopted on March 20, 2025. Such pre-arranged plans allow insiders to schedule trades in advance, helping separate personal trading from day-to-day market decisions.

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

Mark Kidd serves as Executive Vice President and General Manager, Data Centers & ALM at Iron Mountain. His Form 4 filing reflects transactions in company common stock made in his capacity as a reporting insider under SEC rules for executive officers.