Iron Mountain director acquires 310.49 share equivalents

Each Phantom Share is economically equivalent to one common share and becomes payable in common shares following disability or cessation of director service.

Rhea-AI Filing Summary

Iron Mountain Inc. director Theodore R. Samuels II acquired 310.49 Phantom Stock shares on October 6, 2026. The transaction was reported at $116.75 per share and reflects quarterly cash compensation for board service as if reinvested in Phantom Shares. His reported Phantom Stock balance following the acquisition was 14,215.49 shares.

Insider Trade Summary

Grant/Award: 310.49 shares

Grant/Award 1 txn

Insider Samuels Theodore R. II

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Phantom Stock F1, F2	310.49	$116.75	$36K

Holdings After Transaction: Phantom Stock — 14,215.49 contracts (Direct)

Footnotes (2)

1. F1. Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") following the Reporting Person's disability or cessation of service as a director. Each Phantom Share is the economic equivalent of one share of Common Stock.
2. F2. These shares give effect to the Reporting Person's quarterly cash compensation for services on the board of directors of the Company as if reinvested in Phantom Shares.

Key Figures

Phantom Stock acquired: 310.49 shares Reported transaction price: $116.75 per share Phantom Stock following transaction: 14,215.49 shares +1 more

4 metrics

Phantom Stock acquired 310.49 shares October 6, 2026

Reported transaction price $116.75 per share Phantom Stock acquisition

Phantom Stock following transaction 14,215.49 shares Reported balance after the acquisition

Common Stock equivalent 1 common share per Phantom Share Economic equivalence stated for each Phantom Share

Key Terms

Phantom Shares, Directors Deferred Compensation Plan, economic equivalent

3 terms

Phantom Shares financial

"shares of phantom stock (the "Phantom Shares") will become payable"

Phantom shares are a form of employee or executive compensation that mimics the economic value of owning company stock without actually issuing real shares; holders receive cash or equivalent payments tied to the company’s share price or dividends. Think of it like a receipt that pays out if the stock rises — it aligns managers’ interests with shareholders but does not dilute ownership, while creating a future cash obligation that investors should watch as it can affect company cash flow and valuation.

Directors Deferred Compensation Plan financial

"election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan"

A directors deferred compensation plan lets a board member postpone receiving part or all of their cash fees or stock-based pay until a future date, often retirement, allowing taxes to be delayed and payouts to be structured over time. Investors care because these plans change a company’s future cash obligations and reveal how the board’s pay is aligned with long-term performance—like choosing to take a paycheck later to tie personal reward to the company’s future results.

economic equivalent financial

"Each Phantom Share is the economic equivalent of one share of Common Stock"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many phantom shares did IRM director Theodore R. Samuels II acquire?

Theodore R. Samuels II acquired 310.49 Phantom Stock shares on October 6, 2026, reported at $116.75 per share. The shares reflect quarterly cash compensation for board service as if reinvested in Phantom Shares.

When do IRM Phantom Shares become payable in common shares?

The Phantom Shares become payable in common shares following Theodore R. Samuels II's disability or cessation of service as a director. Each Phantom Share is the economic equivalent of one share of Common Stock.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/08/2026 - 04:10 PM EDT Accepted by SEC EDGAR 10/08/2026 - 04:10 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).

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^*

Samuels Theodore R. II

(Last) (First) (Middle)

C/O IRON MOUNTAIN INCORPORATED

85 NEW HAMPSHIRE AVENUE, SUITE 150

(Street)

PORTSMOUTH NEW HAMPSHIRE 03801

(City) (State) (Zip)

UNITED STATES

(Country)

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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/06/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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
Phantom Stock	(1)	10/06/2026		A		310.49(2)		(1)	(1)	Common Stock	310.49	$116.75	14,215.49	D

Explanation of Responses:

1. Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") following the Reporting Person's disability or cessation of service as a director. Each Phantom Share is the economic equivalent of one share of Common Stock.

2. These shares give effect to the Reporting Person's quarterly cash compensation for services on the board of directors of the Company as if reinvested in Phantom Shares.

Remarks:

	/s/ Keely Stewart, under Power of Attorney dated July 6, 2023 from Theodore R Samuels	10/08/2026
	** 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.
* Form 4: SEC 1474 (03-26)