Iron Mountain (NYSE: IRM) director sells 1,892 shares under Rule 10b5-1 plan

Rhea-AI Filing Summary

IRON MOUNTAIN INC director Pamela M. Arway sold shares in a planned transaction. She completed an open-market sale of 1,892 shares of common stock at $128.97 per share and now holds 40,196 shares directly. The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on September 8, 2025, indicating it was scheduled in advance rather than timed discretionarily.

Insider Trade Summary 10b5-1

Net Seller: 1,892 shares ($244,011)

Net Sell 1 txn

Insider Arway Pamela M

Role null

Sold 1,892 shs ($244K)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $.01 per share	1,892	$128.97	$244K

Holdings After Transaction: Common Stock, par value $.01 per share — 40,196 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 1,892 shares Sale price per share: $128.97 per share Shares held after sale: 40,196 shares +1 more

4 metrics

Shares sold 1,892 shares Open-market sale of common stock

Sale price per share $128.97 per share Price for non-derivative common stock

Shares held after sale 40,196 shares Direct ownership following transaction

Net shares sold 1,892 shares transactionSummary netBuySellShares

Key Terms

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

3 terms

Rule 10b5-1 trading plan regulatory

"The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person"

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 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^*

Arway Pamela M

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/12/2026

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	05/12/2026		S(1)		1,892	D	$128.97	40,196	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 September 8, 2025.

Remarks:

	/s/ Keely Stewart, under Power of Attorney dated April 17, 2023, from Pamela M. Arway	05/13/2026
	** 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 insider transaction did IRM director Pamela M. Arway report on this Form 4?

Pamela M. Arway reported an open-market sale of 1,892 shares of Iron Mountain common stock. The shares were sold at a price of $128.97 per share, and the transaction involved non-derivative common stock with a par value of $.01 per share.

How many IRM shares does Pamela M. Arway hold after the reported sale?

After the sale, Pamela M. Arway directly holds 40,196 shares of Iron Mountain common stock. This post-transaction holding reflects her remaining direct ownership, as disclosed in the Form 4, and helps show the sale was a partial reduction rather than a complete exit.

At what price were Pamela M. Arway’s IRM shares sold in this Form 4 filing?

The reported transaction shows Pamela M. Arway sold 1,892 Iron Mountain shares at $128.97 per share. This price applies to the non-derivative common stock sold in the open market, as detailed in the Form 4’s transaction section.

Was the IRM insider sale by Pamela M. Arway made under a Rule 10b5-1 plan?

Yes. A footnote explains the sale was made under a Rule 10b5-1 trading plan adopted on September 8, 2025. Such pre-arranged plans schedule trades in advance, reducing the significance of trade timing as an indicator of insider sentiment.

Does Pamela M. Arway’s Form 4 transaction involve derivative securities of IRM?

No derivative securities are listed in this Form 4. The transaction relates solely to non-derivative common stock of Iron Mountain, and the derivativeSummary section shows no remaining derivative positions reported in connection with this filing.