Iron Mountain (IRM) director Jennifer Allerton sells 7,000 company shares

Rhea-AI Filing Summary

IRON MOUNTAIN INC director Jennifer Allerton sold shares in an open-market trade. She sold 7,000 shares of common stock at a weighted average price of $108.88 per share, across multiple trades between $108.86 and $109.00. After this sale, she directly owns 11,541 shares.

Insider Trade Summary

Net Seller: 7,000 shares ($762,160)

Net Sell 1 txn

Insider Allerton Jennifer

Role Director

Sold 7,000 shs ($762K)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $.01 per share	7,000	$108.88	$762K

Holdings After Transaction: Common Stock, par value $.01 per share — 11,541 shares (Direct)

Footnotes (1)

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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).

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^*

Allerton Jennifer

(Last) (First) (Middle)

C/O IRON MOUNTAIN INCORPORATED

85 NEW HAMPSHIRE AVENUE, SUITE 150

(Street)

PORTSMOUTH NH 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)

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

3. Date of Earliest Transaction (Month/Day/Year)
03/02/2026

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)
			Code	V	Amount	(A) or (D)	Price
Common Stock, par value $.01 per share	03/02/2026		S		7,000	D	$108.88(1)	11,541	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 price reported in Column 4 is a weighted average price. These shares of the Company common stock ("Common Stock") were sold in multiple transactions at prices ranging from $108.86 to $109.00, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (1).

Remarks:

	/s/ Christine Zhang, under Power of Attorney dated June 19, 2025, from Jennifer Allerton	03/03/2026
	** 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.

FAQ

What did IRON MOUNTAIN INC (IRM) director Jennifer Allerton report on this Form 4?

Director Jennifer Allerton reported an open-market sale of IRON MOUNTAIN INC common stock. She sold 7,000 shares and now directly holds 11,541 shares. The transaction was disclosed as a routine Form 4 insider trading report with detailed pricing information.

How many IRON MOUNTAIN INC (IRM) shares did Jennifer Allerton sell and at what price?

Jennifer Allerton sold 7,000 IRON MOUNTAIN INC common shares. The weighted average sale price was $108.88 per share, with individual trades executed in a price range between $108.86 and $109.00, as detailed in the Form 4 footnote.

How many IRON MOUNTAIN INC (IRM) shares does Jennifer Allerton own after this Form 4 transaction?

After the reported sale, Jennifer Allerton directly owns 11,541 IRON MOUNTAIN INC common shares. This post-transaction holding reflects her remaining direct ownership following the 7,000-share open-market sale disclosed in the Form 4 filing.

What type of transaction did Jennifer Allerton execute in IRON MOUNTAIN INC (IRM) stock?

Jennifer Allerton executed an open-market sale of IRON MOUNTAIN INC common stock. The Form 4 lists transaction code “S,” which corresponds to a sale in the open market or a private transaction under SEC reporting rules for insiders.

How was the sale price of IRON MOUNTAIN INC (IRM) shares calculated in Jennifer Allerton’s Form 4?

The reported sale price of $108.88 per share is a weighted average. The Form 4 footnote explains that the 7,000 shares were sold in multiple trades at prices ranging from $108.86 to $109.00, with full trade details available upon request.

Does the Form 4 indicate whether Jennifer Allerton’s IRON MOUNTAIN INC (IRM) shares are held directly or indirectly?

The Form 4 identifies Jennifer Allerton’s ownership as direct. The transaction is coded as direct ownership, and there are no footnotes indicating that the shares are held through a trust, partnership, or other indirect ownership vehicle.