Iron Mountain CEO sells shares under 10b5-1 plan

IRON MOUNTAIN INC President and CEO William L. Meaney reported selling a total of 98,657 shares of common stock in open-market transactions on March 5, 2026.

Rhea-AI Filing Summary

IRON MOUNTAIN INC President and CEO William L. Meaney reported selling a total of 98,657 shares of common stock in open-market transactions on March 5, 2026. The sales were executed in three tranches at weighted average prices of $105.26, $106.15, and $107.02, with each tranche consisting of multiple trades within stated price ranges. According to the filing, these transactions were made under a Rule 10b5-1 trading plan adopted on March 14, 2025.

Following the sales, his direct ownership fell to zero in the reported accounts, while indirect holdings are listed as 82,970 shares held by the Meaney 2024 Master Trust and 212,680 shares held by Meaney Master Trust #2.

Insider Trade Summary

Net Seller: 98,657 shares

Net Sell 5 txns

Insider Meaney William L

Role President and CEO

Sold 98,657 shs ($10.48M)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $.01 per share	26,278	$105.26	$2.77M
Sale	Common Stock, par value $.01 per share	34,358	$106.15	$3.65M
Sale	Common Stock, par value $.01 per share	38,021	$107.02	$4.07M
holding	Common Stock, par value $.01 per share	--	--	--
holding	Common Stock, par value $.01 per share	--	--	--

Holdings After Transaction: Common Stock, par value $.01 per share — 0 shares (Direct); Common Stock, par value $.01 per share — 82,970 shares (Indirect, By Meaney 2024 Master Trust); Common Stock, par value $.01 per share — 212,680 shares (Indirect, By Meaney Master Trust #2)

Footnotes (4)

1. F1. The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025.
2. F2. The price reported in Column 4 is a weighted average price. These shares of Iron Mountain Incorporated common stock ("Common Stock") were sold in multiple transactions at prices ranging from $104.62 to $105.61, inclusive. The Reporting Person undertakes to provide Iron Mountain Incorporated (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 (2).
3. F3. 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 $105.62 to $106.61, 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 (3).
4. F4. 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 $106.62 to $107.54, 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).

FAQ

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What insider transaction did IRON MOUNTAIN INC (IRM) report for William L. Meaney?

IRON MOUNTAIN INC reported that President and CEO William L. Meaney sold 98,657 shares of common stock on March 5, 2026. The sales were open-market transactions executed in three tranches at weighted average prices of $105.26, $106.15, and $107.02.

At what prices did the IRM CEO sell his shares on March 5, 2026?

William L. Meaney’s reported sales used weighted average prices of $105.26, $106.15, and $107.02 per share. Footnotes explain each average reflects multiple trades within price ranges from $104.62 up to $107.54 for Iron Mountain common stock.

Was the IRM CEO’s March 5, 2026 stock sale under a Rule 10b5-1 plan?

Yes. The filing states the transactions were made pursuant to a Rule 10b5-1 trading plan adopted by William L. Meaney on March 14, 2025. This indicates the sales followed a pre-established trading framework referenced in the disclosure.

How many IRON MOUNTAIN INC shares does William L. Meaney hold indirectly after the transactions?

After the reported sales, indirect holdings are listed as 82,970 shares held by the Meaney 2024 Master Trust and 212,680 shares held by Meaney Master Trust #2. These positions are reported as indirect ownership interests in Iron Mountain common stock.

Did the IRM CEO retain any directly owned shares after the March 5, 2026 sales?

The Form 4 shows direct ownership accounts with total shares following the final reported sale of zero. Indirect ownership remains through the Meaney 2024 Master Trust and Meaney Master Trust #2, which together hold reported indirect positions in Iron Mountain common stock.

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Accepted by SEC EDGAR 03/09/2026 - 04:31 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).

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)
03/05/2026

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	03/05/2026		S(1)		26,278	D	$105.26(2)	72,379	D
Common Stock, par value $.01 per share	03/05/2026		S(1)		34,358	D	$106.15(3)	38,021	D
Common Stock, par value $.01 per share	03/05/2026		S(1)		38,021	D	$107.02(4)	0	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

Explanation of Responses:

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

2. The price reported in Column 4 is a weighted average price. These shares of Iron Mountain Incorporated common stock ("Common Stock") were sold in multiple transactions at prices ranging from $104.62 to $105.61, inclusive. The Reporting Person undertakes to provide Iron Mountain Incorporated (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 (2).

3. 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 $105.62 to $106.61, 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 (3).

4. 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 $106.62 to $107.54, 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).

Remarks:

	/s/ Christine Zhang, under Power of Attorney dated February 27, 2025, from William Meaney	03/09/2026
	** 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.