Iron Mountain (IRM) CEO granted 464,767 performance units in equity award

Rhea-AI Filing Summary

Iron Mountain president and CEO William L. Meaney acquired 464,767 Performance Units through an equity award. Each Performance Unit represents a contingent right to receive one share of Iron Mountain common stock. This award reflects the Compensation Committee’s determination, effective February 16, 2026, of the final number of units earned from a grant initially made on March 1, 2023.

The Performance Units will fully vest on March 1, 2026, aligning the CEO’s compensation with longer-term company performance. Following this determination, Meaney directly holds 650,674 Performance Units in total.

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

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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^*

Meaney William L

(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
X	Officer (give title below)		Other (specify below)
	President and CEO

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		464,767(2)		(3)	(3)	Common Stock, par value $.01 per share	464,767	$0	650,674	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 February 27, 2025, from William Meaney	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 did IRON MOUNTAIN INC (IRM) report in this Form 4 for its CEO?

Iron Mountain reported that president and CEO William L. Meaney acquired 464,767 Performance Units. These units come from a March 1, 2023 grant, with the final award amount determined by the Compensation Committee effective February 16, 2026 after the performance period ended.

What are the Performance Units granted to IRM CEO William L. Meaney?

Each Performance Unit represents a contingent right to receive one share of Iron Mountain common stock. The 464,767 units are part of a performance-based equity grant, linking the CEO’s potential share ownership to the company’s achievement of specified performance goals over a defined period.

When were the IRON MOUNTAIN (IRM) Performance Units originally granted to the CEO?

The Performance Units were initially granted to William L. Meaney on March 1, 2023. The current award reflects the Compensation Committee’s determination, effective February 16, 2026, of the actual number of units earned after the completion of the applicable performance period and related review.

When will the IRM CEO’s Performance Units reported in this Form 4 fully vest?

The Performance Units reported for William L. Meaney will fully vest on March 1, 2026. Until vesting, they remain contingent rights, meaning actual share delivery depends on satisfying the vesting schedule and the terms attached to this performance-based equity award program.

How many Performance Units does the IRON MOUNTAIN CEO hold after this transaction?

After this award determination, William L. Meaney directly holds 650,674 Performance Units. This figure reflects the updated total following recognition of 464,767 units from the March 1, 2023 performance grant, as determined by the Compensation Committee effective February 16, 2026.

Did the IRM CEO pay a price per unit for these Performance Units?

The transaction lists a price per Performance Unit of $0.0000, indicating these units were granted as part of compensation rather than purchased on the open market. They represent equity-based incentives tied to Iron Mountain’s performance and vesting conditions over the relevant period.