Iron Mountain EVP sells 6,000 company shares

Iron Mountain Inc. executive Mark Kidd reported an open-market sale of 6,000 shares of common stock.

Rhea-AI Filing Summary

Iron Mountain Inc. executive Mark Kidd reported an open-market sale of 6,000 shares of common stock. The shares were sold at a price of $125.62 per share. After this transaction, Kidd directly holds 107,507 Iron Mountain shares. The filing notes that the trade was executed under a pre-arranged Rule 10b5-1 trading plan adopted on March 20, 2025, indicating it was scheduled in advance rather than timed discretionarily.

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 ($754K)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $.01 per share	6,000	$125.62	$754K

Holdings After Transaction: Common Stock, par value $.01 per share — 107,507 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: $125.62 per share Shares held after transaction: 107,507 shares +2 more

5 metrics

Shares sold 6,000 shares Open-market sale of common stock

Sale price $125.62 per share Price for the 6,000-share sale

Shares held after transaction 107,507 shares Direct ownership following the sale

Net shares sold 6,000 shares Net buy/sell direction is net-sell

10b5-1 plan adoption date March 20, 2025 Date the trading plan was adopted

Key Terms

Rule 10b5-1 trading plan, open-market sale, Form 4, non-derivative, +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"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 of common stock"

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.

Form 4 regulatory

"Iron Mountain executive transaction was disclosed on a Form 4 insider filing"

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.

non-derivative financial

"transaction_type: non-derivative common stock"

transaction code "S" regulatory

"transaction_code: S indicates sale in open market or private transaction"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Iron Mountain (IRM) report for Mark Kidd?

Iron Mountain reported that executive Mark Kidd executed an open-market sale of 6,000 shares of common stock. This transaction was disclosed on a Form 4 and reflects a routine insider trade rather than a new grant or option exercise.

At what price did Mark Kidd sell Iron Mountain (IRM) shares?

Mark Kidd sold 6,000 Iron Mountain shares at a price of $125.62 per share. This per-share price comes directly from the reported Form 4 transaction and represents the execution price for the open-market sale.

How many Iron Mountain (IRM) shares does Mark Kidd hold after the sale?

Following the reported transaction, Mark Kidd directly holds 107,507 Iron Mountain common shares. This post-transaction ownership figure is shown in the Form 4 and provides context on his remaining equity stake after the 6,000-share sale.

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

Yes. The Form 4 footnote states the transaction was made under a Rule 10b5-1 trading plan adopted on March 20, 2025. Such plans pre-schedule trades, indicating the timing was set in advance rather than chosen opportunistically.

What type of transaction did Iron Mountain (IRM) disclose for Mark Kidd?

The filing describes the trade as an open-market sale of non-derivative common stock. The transaction code is “S,” which indicates a sale in the open market or a private transaction, rather than an option exercise, gift, or tax withholding event.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 07/02/2026 - 04:30 PM EDT 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)
07/01/2026

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	07/01/2026		S(1)		6,000	D	$125.62	107,507	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	07/02/2026
	** 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)