Iron Mountain (IRM) EVP Greg McIntosh receives 87,960 performance units

Rhea-AI Filing Summary

McIntosh Greg W reported acquisition or exercise transactions in this Form 4 filing.

Iron Mountain Inc. executive Greg W. McIntosh, EVP, CCO & GM, Global RM, reported an equity award tied to prior performance. On February 16, 2026, the Compensation Committee determined an actual award of 87,960 Performance Units from a grant originally made on March 1, 2023.

Each Performance Unit represents a contingent right to receive one share of Iron Mountain common stock, with these units scheduled to fully vest on March 1, 2026. Following this determination, McIntosh now holds 123,144 Performance Units directly, reflecting non-cash, performance-based compensation.

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

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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^*

McIntosh Greg W

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, CCO & GM, Global RM

3. Date of Earliest Transaction (Month/Day/Year)
02/16/2026

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

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
Performance Units	(1)	02/16/2026		A		87,960(2)		(3)	(3)	Common Stock, par value $.01 per share	87,960	$0	123,144	D

Explanation of Responses:

1. Each Performance Unit ("PU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").

2. The PUs were initially granted to the Reporting Person on March 1, 2023. This Form 4 is being filed to reflect the determination by the Compensation Committee, effective as of February 16, 2026, of the actual award of PUs under the grant after completion of the relevant performance period.

3. The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026.

Remarks:

	/s/ Christine Zhang, under Power of Attorney dated June 19, 2025, from Greg McIntosh	02/18/2026
	** 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 insider transaction did IRM executive Greg McIntosh report on this Form 4?

Greg McIntosh reported an acquisition of equity-based compensation. The filing reflects an actual award of 87,960 Performance Units determined on February 16, 2026, from a March 1, 2023 grant tied to a completed performance period.

What does each Performance Unit represent for IRON MOUNTAIN INC (IRM)?

Each Performance Unit represents a contingent right to receive one share of Iron Mountain common stock. This means the units can convert into an equal number of shares if vesting and performance conditions are satisfied.

When were the IRM Performance Units for Greg McIntosh originally granted?

The Performance Units were originally granted to Greg McIntosh on March 1, 2023. The February 16, 2026 action simply records the Compensation Committee’s determination of the actual award amount after the relevant performance period ended.

When will Greg McIntosh’s IRM Performance Units fully vest?

The Performance Units will fully vest on March 1, 2026. At that time, subject to conditions, the units can convert into Iron Mountain common shares on a one-for-one basis, reflecting completed service and performance requirements.

How many IRM Performance Units does Greg McIntosh hold after this transaction?

After this transaction, Greg McIntosh holds 123,144 Performance Units directly. This updated total reflects the Compensation Committee’s determination of 87,960 Performance Units under the earlier March 1, 2023 performance-based grant.

Is the IRM Form 4 transaction a market purchase or sale of shares?

The transaction is not a market trade but an equity award. It is coded as a grant, award, or other acquisition of 87,960 Performance Units, representing non-cash, performance-based compensation rather than an open-market buy or sell.