Iron Mountain (IRM) director Monte E. Ford receives 1,892-share RSU award

Rhea-AI Filing Summary

FORD MONTE E reported acquisition or exercise transactions in this Form 4 filing.

IRON MOUNTAIN INC director Monte E. Ford received an equity grant of 1,892 shares of common stock through restricted stock units. These RSUs were granted on May 7, 2026 and vest in full on the grant date, meaning they settle into shares immediately.

Following this award, Ford holds a total of 31,817 shares of Iron Mountain common stock directly. This is a compensation-related grant rather than an open-market purchase or sale.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider FORD MONTE E

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 — 31,817 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

RSU shares granted: 1,892 shares Grant price: $0.0000 per share Shares after transaction: 31,817 shares +1 more

4 metrics

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

Grant price $0.0000 per share Equity compensation, not an open-market purchase

Shares after transaction 31,817 shares Total direct holdings following RSU settlement

Transaction type Grant, award, or other acquisition Code A, non-derivative common stock

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""

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^*

FORD MONTE E

(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	31,817	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 25, 2023 from Monte Ford	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 did IRM director Monte E. Ford report in this Form 4?

Monte E. Ford reported receiving 1,892 shares of IRON MOUNTAIN INC common stock via restricted stock units. The award is a compensation grant, not an open-market trade, and increases his direct holdings in the company.

How many IRM shares did Monte E. Ford acquire in this transaction?

Monte E. Ford acquired 1,892 shares of IRON MOUNTAIN INC common stock through a restricted stock unit grant. The RSUs were granted at no cash cost per share as part of his director compensation on May 7, 2026.

What is Monte E. Ford’s total IRM shareholding after this grant?

After the grant, Monte E. Ford directly holds 31,817 shares of IRON MOUNTAIN INC common stock. This total includes the 1,892 shares received from restricted stock units that vested and settled in full on the grant date.

Was Monte E. Ford’s IRM transaction a market purchase or sale?

The transaction was not a market purchase or sale. It reflects a grant of restricted stock units that vested immediately, providing 1,892 shares of IRON MOUNTAIN INC common stock as equity compensation to Monte E. Ford.

When do the restricted stock units granted to Monte E. Ford vest?

The restricted stock units granted to Monte E. Ford vest in their entirety on the grant date, May 7, 2026. Because they vest immediately, they are settled into shares of IRON MOUNTAIN INC common stock right away.