Were the IRM CEO’s March 2026 share sales under a Rule 10b5-1 plan?

Yes. A footnote explains the transactions were made under a Rule 10b5-1 trading plan adopted by the reporting person on March 14, 2025. Such plans allow pre-arranged trading instructions, providing a structured framework for insider share transactions over time.

Iron Mountain (NYSE: IRM) CEO offloads 197K shares in March 10b5-1 stock sales

Q: How many IRM shares does William L. Meaney still hold indirectly after these transactions?

The Form 4 reports indirect ownership of 82,970 shares of Iron Mountain common stock held by the Meaney 2024 Master Trust and 212,680 shares held by Meaney Master Trust #2. These positions are reported as indirect holdings, separate from his directly owned shares.

Q: What role does William L. Meaney hold at IRON MOUNTAIN INC in this Form 4?

The reporting person is identified as President and CEO and a director of Iron Mountain Inc. This means the disclosed transactions represent insider trading activity by the company’s chief executive, as required to be reported under Section 16 rules for officers and directors.

Filing Impact

(Very High)

Filing Sentiment

(Very Negative)

Form Type

Rhea-AI Filing Summary

IRON MOUNTAIN INC President and CEO William L. Meaney reported open-market sales of 197,318 shares of common stock in multiple transactions on 2026-03-03 and 2026-03-04. The trades are reported at weighted average prices generally around $105–$108 per share.

The filing states these sales were made under a Rule 10b5-1 trading plan adopted on March 14, 2025. After the reported activity, Meaney continues to hold Iron Mountain shares both directly and indirectly through the Meaney 2024 Master Trust and Meaney Master Trust #2, which report holdings of 82,970 and 212,680 shares, respectively.

Insider Trade Summary

Net Seller: 197,318 shares ($21,132,767)

Net Sell 8 txns

Insider Meaney William L

Role President and CEO

Sold 197,318 shs ($21.13M)

Type	Security	Shares	Price	Value
Sale	Common Stock, par value $.01 per share	27,688	$106.96	$2.96M
Sale	Common Stock, par value $.01 per share	70,971	$107.52	$7.63M
Sale	Common Stock, par value $.01 per share	23,590	$105.25	$2.48M
Sale	Common Stock, par value $.01 per share	18,360	$106.33	$1.95M
Sale	Common Stock, par value $.01 per share	30,940	$107.43	$3.32M
Sale	Common Stock, par value $.01 per share	25,769	$107.94	$2.78M
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 — 169,628 shares (Direct); Common Stock, par value $.01 per share — 82,970 shares (Indirect, By Meaney 2024 Master Trust)

Footnotes (1)

The transaction was made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2025. 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 $104.82 to $105.80, 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). 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 $105.82 to $106.81, 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 (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 $106.82 to $107.82, 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). 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 $107.82 to $108.18, 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). 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 $106.20 to $107.19, 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). 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 $107.20 to $108.08, 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).

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 03/05/2026 - 04:12 PM

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^*

Meaney William L

(Last)

(First)

(Middle)

C/O IRON MOUNTAIN INCORPORATED

85 NEW HAMPSHIRE AVENUE, SUITE 150

(Street)

PORTSMOUTH

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)
03/03/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock, par value $.01 per share	03/03/2026		S⁽¹⁾		23,590	D	$105.25⁽²⁾	272,385	D
Common Stock, par value $.01 per share	03/03/2026		S⁽¹⁾		18,360	D	$106.33⁽³⁾	254,025	D
Common Stock, par value $.01 per share	03/03/2026		S⁽¹⁾		30,940	D	$107.43⁽⁴⁾	223,085	D
Common Stock, par value $.01 per share	03/03/2026		S⁽¹⁾		25,769	D	$107.94⁽⁵⁾	197,316	D
Common Stock, par value $.01 per share	03/04/2026		S⁽¹⁾		27,688	D	$106.96⁽⁶⁾	169,628	D
Common Stock, par value $.01 per share	03/04/2026		S⁽¹⁾		70,971	D	$107.52⁽⁷⁾	98,657	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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 $104.82 to $105.80, 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 $105.82 to $106.81, 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 (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 $106.82 to $107.82, 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 $107.82 to $108.18, 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 $106.20 to $107.19, 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 $107.20 to $108.08, 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).

Remarks:

	/s/ Christine Zhang, under Power of Attorney dated February 27, 2025, from William Meaney	03/05/2026
	** 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.

Source: View Original Filing on SEC EDGAR

FAQ

What insider activity did IRM CEO William L. Meaney report on this Form 4?

William L. Meaney reported multiple open-market sales of Iron Mountain common stock on 2026-03-03 and 2026-03-04, totaling 197,318 shares. The transactions involved weighted average sale prices generally in the $105–$108 per share range, according to the filing footnotes.

How many IRON MOUNTAIN INC (IRM) shares did the CEO sell in March 2026?

The Form 4 shows the CEO as the reporting person for sales totaling 197,318 shares of Iron Mountain common stock. These sales were executed over multiple transactions across 2026-03-03 and 2026-03-04, all coded as open-market or private sale transactions in the filing.

What prices did the IRON MOUNTAIN INC CEO receive for the sold shares?

The filing lists weighted average prices around $105.25, $106.33, $107.43, $107.94, $106.96, and $107.52 per share. Footnotes state the actual trades occurred in ranges from $104.82 up to $108.18, across multiple individual transactions.

How many IRM shares does William L. Meaney still hold indirectly after these transactions?

The Form 4 reports indirect ownership of 82,970 shares of Iron Mountain common stock held by the Meaney 2024 Master Trust and 212,680 shares held by Meaney Master Trust #2. These positions are reported as indirect holdings, separate from his directly owned shares.

What role does William L. Meaney hold at IRON MOUNTAIN INC in this Form 4?

The reporting person is identified as President and CEO and a director of Iron Mountain Inc. This means the disclosed transactions represent insider trading activity by the company’s chief executive, as required to be reported under Section 16 rules for officers and directors.