Iron Mountain (NYSE: IRM) director receives 1,892-share RSU award

Rhea-AI Filing Summary

DAUTEN KENT P reported acquisition or exercise transactions in this Form 4 filing.

Iron Mountain Inc. director Kent P. Dauten received an equity award of 1,892 shares of common stock on May 7, 2026. The shares were issued through restricted stock units that vested in full on the grant date, bringing his direct holdings to 1,209,573 shares of Iron Mountain common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider DAUTEN KENT P

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $.01 per share	1,892	$0.00	--

Holdings After Transaction: Common Stock, par value $.01 per share — 1,209,573 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares granted: 1,892 shares Transaction price per share: $0.0000 per share Shares held after transaction: 1,209,573 shares

3 metrics

Shares granted 1,892 shares RSU grant on May 7, 2026

Transaction price per share $0.0000 per share Equity award, not open-market purchase

Shares held after transaction 1,209,573 shares Direct ownership following May 7, 2026 grant

Key Terms

restricted stock units ("RSUs"), vest in their entirety, Grant, award, or other acquisition

3 terms

restricted stock units ("RSUs") financial

"Consists of shares issuable upon the settlement of restricted stock units ("RSUs") granted on May 7, 2026."

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

vest in their entirety financial

"The RSUs vest in their entirety on the grant date."

Grant, award, or other acquisition financial

"transaction_code_description": "Grant, award, or other acquisition""

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^*

DAUTEN KENT P

(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)
05/07/2026

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	05/07/2026		A		1,892(1)	A	$0	1,209,573	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. Consists of shares issuable upon the settlement of restricted stock units ("RSUs") granted on May 7, 2026. The RSUs vest in their entirety on the grant date.

Remarks:

	/s/ Keely Stewart, under Power of Attorney dated April 17, 2023 from Kent P. Dauten	05/11/2026
	** 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 IRON MOUNTAIN INC (IRM) report for Kent P. Dauten?

IRON MOUNTAIN INC reported that director Kent P. Dauten received an equity award of 1,892 shares of common stock. These shares came from restricted stock units granted on May 7, 2026 that vested immediately on the grant date, increasing his direct ownership position.

How many IRON MOUNTAIN INC shares does Kent P. Dauten hold after this Form 4?

Following the May 7, 2026 award, Kent P. Dauten directly holds 1,209,573 shares of IRON MOUNTAIN INC common stock. This total includes the 1,892 shares issued upon settlement of restricted stock units that vested in full on the grant date.

What type of equity compensation did IRON MOUNTAIN INC grant to Kent P. Dauten?

IRON MOUNTAIN INC granted Kent P. Dauten restricted stock units that settle into common shares. On May 7, 2026 he was awarded RSUs corresponding to 1,892 shares, with the footnote stating that these RSUs vested in their entirety immediately on the grant date.

Was there any purchase price for the IRM shares granted to Kent P. Dauten?

The awarded 1,892 shares of IRON MOUNTAIN INC common stock carried a reported transaction price per share of $0.0000. This indicates they were received as a grant or award of equity compensation rather than acquired through an open-market stock purchase.

Does this IRON MOUNTAIN INC Form 4 show any stock sales by Kent P. Dauten?

The Form 4 shows only an acquisition transaction classified as a grant, award, or other acquisition of 1,892 shares on May 7, 2026. The transaction summary lists no sales, gifts, tax withholding dispositions, or derivative exercises in this particular filing.