IRM Form 4: Mark Kidd Disposes of 6,000 Shares Under 10b5-1 Plan

Rhea-AI Filing Summary

Iron Mountain insider Mark Kidd sold 6,000 shares of IRM common stock at $91.05 per share under a pre-established trading plan. The Form 4 reports the sale occurred on 09/02/2025 pursuant to a Rule 10b5-1 plan adopted March 20, 2025. Following the sale, Mr. Kidd beneficially owns 79,081 shares, reported as direct ownership. The filing was signed under power of attorney on 09/03/2025. The disclosure indicates a routine, pre-planned disposition rather than an ad hoc trade.

Positive

• Transaction executed under a Rule 10b5-1 plan, indicating the sale was pre-arranged and intended to provide an affirmative defense to insider trading claims
• Reporting shows continued significant ownership: the reporting person still beneficially owns 79,081 shares after the sale
• Form filed promptly and signed under power of attorney, indicating timely compliance with Section 16 reporting requirements

Negative

• Insider sale of 6,000 shares could be viewed by some investors as insider liquidity rather than a signal of confidence
• Sale price $91.05 may reflect the market valuation at the time, but the filing provides no context for rationale beyond the 10b5-1 plan

Insights

Securities Analyst

TL;DR: Insider sold a modest block of shares via a 10b5-1 plan; ownership remains material but the trade appears pre-arranged.

The sale of 6,000 shares at $91.05 reduces the reporting persons direct stake to 79,081 shares. Because the transaction is executed under a Rule 10b5-1 plan adopted March 20, 2025, the trade meets affirmative-defense conditions and signals it was pre-scheduled. For investors, this is a routine insider liquidity event documented per Section 16 requirements; there is no information in the filing about changes to compensation, corporate strategy, or company performance tied to the sale.

Corporate Governance Expert

TL;DR: Proper disclosure and PoA signature indicate compliance; the 10b5-1 plan reduces regulatory risk around the timing of the sale.

The Form 4 explicitly states the 10b5-1 plan adoption date and shows the report was signed under power of attorney. These elements demonstrate adherence to insider-trading protocol and timely reporting obligations. The filing does not disclose any derivative transactions or additional changes in ownership structure. From a governance perspective, this is a routine, compliant disclosure rather than a governance concern.

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^*

Kidd Mark

(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, GM Data Centers & ALM

3. Date of Earliest Transaction (Month/Day/Year)
09/02/2025

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	09/02/2025		S(1)		6,000	D	$91.05	79,081	D

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 20, 2025.

Remarks:

	/s/ Christine Zhang, under Power of Attorney dated June 19, 2025, from Mark Kidd	09/03/2025
	** 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 Mark Kidd report in the Form 4 for IRM?

He reported selling 6,000 shares of Iron Mountain Inc. common stock on 09/02/2025 at a price of $91.05 per share, leaving him with 79,081 shares beneficially owned.

Was the sale part of a pre-arranged trading plan for IRM insider trades?

Yes. The Form 4 states the transaction was made pursuant to a Rule 10b5-1 trading plan adopted on March 20, 2025.

Does the Form 4 show any derivative transactions by Mark Kidd in IRM?

No. Table II for derivative securities contains no entries; only a non-derivative common stock sale is reported.

Who signed the Form 4 filing for Mark Kidd?

Christine Zhang signed under a power of attorney dated June 19, 2025, and the signature is dated 09/03/2025.

How does the filing affect insider ownership disclosure for IRM?

After the reported sale, the filing shows direct beneficial ownership of 79,081 shares for the reporting person; no joint or indirect ownership changes are disclosed.