Iron Mountain director receives 1,892-share RSU award

IRON MOUNTAIN INC director Pamela M. Arway received a share-based award.

Rhea-AI Filing Summary

IRON MOUNTAIN INC director Pamela M. Arway received a share-based award. On May 7, 2026, she acquired 1,892 shares of common stock through the settlement of restricted stock units granted on that date at a stated price of $0.00 per share.

The footnote explains these shares are issuable upon settlement of RSUs that vest in full on the grant date, meaning the award became fully vested immediately. After this grant, Arway directly holds a total of 42,088 common shares, giving context to the size of this compensation-related transaction.

Insider Trade Summary

Grant/Award: 1,892 shares

Grant/Award 1 txn

Insider Arway Pamela M

Role Director

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

Holdings After Transaction: Common Stock, par value $.01 per share — 42,088 shares (Direct)

Footnotes (1)

1. F1. 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.

Key Figures

RSU shares granted: 1,892 shares Grant price per share: $0.00 per share Shares held after grant: 42,088 shares

3 metrics

RSU shares granted 1,892 shares Restricted stock units granted and settled on May 7, 2026

Grant price per share $0.00 per share Stated transaction price for RSU share issuance

Shares held after grant 42,088 shares Total IRM common shares directly held by Arway after transaction

Key Terms

restricted stock units ("RSUs"), vest in their entirety on the grant date, 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 on the grant date 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""

FAQ

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

What insider transaction did IRM director Pamela M. Arway report on this Form 4?

Pamela M. Arway reported acquiring 1,892 IRON MOUNTAIN INC common shares via a grant of restricted stock units. These RSUs were granted on May 7, 2026 and settled into shares, reflecting a compensation-related equity award rather than an open-market stock purchase or sale.

How many IRON MOUNTAIN INC shares does Pamela M. Arway hold after this RSU grant?

After the May 7, 2026 restricted stock unit settlement, Pamela M. Arway directly holds 42,088 IRON MOUNTAIN INC common shares. This total includes the 1,892 shares underlying the RSUs that vested in full on the grant date and were issued at a stated price of $0.00 per share.

Were the IRM shares acquired by Pamela M. Arway bought on the open market?

No, the 1,892 IRM shares were not bought on the open market; they came from an equity award. The filing shows an "A" code transaction, described as a grant or award, with a price per share of $0.0000, indicating compensation-related issuance rather than a market purchase.

What does the RSU vesting language mean in Pamela M. Arway’s IRM Form 4?

The footnote states the restricted stock units vest in their entirety on the grant date, meaning full vesting occurs immediately. As a result, the 1,892 RSUs granted on May 7, 2026 are fully settled into common shares right away, instead of vesting over multiple future dates.

Is Pamela M. Arway’s IRM Form 4 transaction considered a buy or sell of stock?

The transaction is categorized as an acquisition through a grant or award, not a traditional buy or sell. The Form 4 shows transaction code "A" with a description of grant, award, or other acquisition, reflecting director compensation in equity rather than trading activity in the market.

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

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Accepted by SEC EDGAR 05/11/2026 - 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).

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)
05/07/2026

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	42,088	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 Pamela M. Arway	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)