Iron Mountain (NYSE: IRM) CEO sells 137,133 shares in 10b5-1 trades

Rhea-AI Filing Summary

Iron Mountain Inc.'s President and CEO William L. Meaney reported a mix of equity award vesting, option activity, and stock sales. He acquired 650,674 shares of common stock on March 1, 2026 through full vesting of previously granted performance units, with each performance unit representing one share of common stock, and 256,040 of those shares were withheld to cover income tax obligations rather than sold.

On March 1, 2026 he also received a grant of 74,069 employee stock options and exercised fully vested options representing 38,474 shares. On March 2, 2026 he sold an aggregate 137,133 shares of common stock in a series of open-market transactions at weighted-average prices between $106.65 and $110.81 per share under a Rule 10b5-1 trading plan adopted on March 14, 2025, and continued to hold a substantial direct and indirect stake afterward.

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).

X

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)
03/01/2026

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
Common Stock, par value $.01 per share	03/01/2026		M		650,674(1)	A	$0	650,674	D
Common Stock, par value $.01 per share	03/01/2026		F		256,040(2)	D	$108.33	394,634	D
Common Stock, par value $.01 per share	03/02/2026		S(3)		2,929	D	$107.16(4)	391,705	D
Common Stock, par value $.01 per share	03/02/2026		S(3)		13,778	D	$108.27(5)	377,927	D
Common Stock, par value $.01 per share	03/02/2026		S(3)		37,296	D	$109.07(6)	340,631	D
Common Stock, par value $.01 per share	03/02/2026		S(3)		41,456	D	$110.05(7)	299,175	D
Common Stock, par value $.01 per share	03/02/2026		S(3)		3,200	D	$110.74(8)	295,975	D
Common Stock, par value $.01 per share	03/02/2026		M(3)		38,474	A	$37	334,449	D
Common Stock, par value $.01 per share	03/02/2026		S(3)		2,076	D	$107.95(9)	332,373	D
Common Stock, par value $.01 per share	03/02/2026		S(3)		16,457	D	$108.91(10)	315,916	D
Common Stock, par value $.01 per share	03/02/2026		S(3)		18,117	D	$110.02(11)	297,799	D
Common Stock, par value $.01 per share	03/02/2026		S(3)		1,824	D	$110.64(12)	295,975	D
Common Stock, par value $.01 per share								82,970	I	By Meaney 2024 Master Trust
Common Stock, par value $.01 per share								212,680	I	By Meaney Master Trust #2

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	(13)	03/01/2026		M			650,674	(14)	(14)	Common Stock, par value $.01 per share	650,674	$0	0	D
Employee Stock Option (Right to Buy)	$108.33	03/01/2026		A		74,069		(15)	(15)	Common Stock, par value $.01 per share	74,069	(16)	74,069	D
Employee Stock Option (Right to Buy)	$37	03/02/2026		M(3)			38,474	(17)	02/16/2027	Common Stock, par value $.01 per share	38,474	(16)	346,266	D

Explanation of Responses:

1. This acquisition is reported to reflect the full vesting of performance units ("PUs") previously granted to the Reporting Person on March 1, 2023. Effective February 16, 2026, the Compensation Committee of Iron Mountain Incorporated (the "Company")'s Board of Directors determined the actual award of PUs under the grant after completion of the relevant performance period, and the PUs fully vested on March 1, 2026.

2. Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding obligation in connection with the net settlement of the PUs and does not represent a sale.

3. The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.

4. The price reported in Column 4 is a weighted average price. These shares of the Company common stock ("Common Stock") were sold in multiple transactions at prices ranging from $106.65 to $107.64, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (4).

5. The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $107.67 to $108.66, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (5).

6. The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $108.67 to $109.66, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (6).

7. The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $109.68 to $110.58, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (7).

8. The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $110.70 to $110.79, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (8).

9. The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $107.35 to $108.35, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (9).

10. The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $108.39 to $109.36, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (10).

11. The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $109.40 to $110.40, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (11).

12. The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $110.40 to $110.81, inclusive. The Reporting Person undertakes to provide the Company, any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (12).

13. Each PU represents a contingent right to receive one share of Common Stock.

14. The PUs were initially granted to the Reporting Person on March 1, 2023. Effective as of February 16, 2026, the Compensation Committee determined the actual award of PUs under the grant after completion of the relevant performance period, and the PUs fully vested on March 1, 2026.

15. This stock option becomes exercisable in three substantially equal annual installments beginning on the first anniversary of the date of grant.

16. Not applicable.

17. This stock option, initially representing a right to purchase a total of 461,696 shares, is fully vested.

Remarks:

	/s/ Christine Zhang, under Power of Attorney dated February 27, 2025, from William Meaney	03/03/2026
	** 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 transactions did IRM CEO William Meaney report?

William Meaney reported vesting of 650,674 performance units into common stock, a grant of 74,069 stock options, exercise of 38,474 options, and open-market sales totaling 137,133 shares, along with tax withholding of 256,040 shares related to the vesting.

Were Iron Mountain (IRM) CEO share sales pre-planned under Rule 10b5-1?

Yes. The filing states the share sales were executed under a Rule 10b5-1 trading plan adopted by William Meaney on March 14, 2025, indicating trades followed a pre-established schedule rather than discretionary, ad hoc selling decisions at the time of execution.

At what prices did the IRM CEO sell common stock in these transactions?

The reported open-market sales of Iron Mountain common stock were executed at weighted-average prices within several ranges, with disclosed price bands running from $106.65 to $110.81 per share, reflecting multiple transactions aggregated into average prices for reporting purposes.

How many Iron Mountain shares were withheld for taxes in the CEO’s award vesting?

In connection with the vesting and net settlement of 650,674 performance units, 256,040 shares of Iron Mountain common stock were withheld to satisfy income tax obligations. The filing clarifies this withholding is not treated as a market sale of shares.

What new equity awards did the Iron Mountain CEO receive in this Form 4?

William Meaney received a grant of 74,069 employee stock options with a right to buy Iron Mountain common stock. The filing notes this option becomes exercisable in three substantially equal annual installments beginning on the first anniversary of the grant date.

Did the Iron Mountain CEO’s performance units fully vest in this period?

Yes. Performance units initially granted on March 1, 2023 fully vested on March 1, 2026 after the Compensation Committee determined the actual award on February 16, 2026, resulting in the acquisition of 650,674 shares of Iron Mountain common stock.