Iron Mountain director granted phantom stock units

IRON MOUNTAIN INC director Doyle Simons reported a routine compensation-related grant of phantom stock.

Rhea-AI Filing Summary

IRON MOUNTAIN INC director Doyle Simons reported a routine compensation-related grant of phantom stock. He acquired 339.3600 phantom stock units at an assigned value of $116.7900 per unit, bringing his total phantom stock holdings to 46,213.2960 units held directly.

These phantom shares are part of Iron Mountain’s Directors Deferred Compensation Plan. Each phantom share is economically equivalent to one share of common stock and will be settled in common shares after Simons’ disability or when he stops serving as a director, including credit for reinvested dividends.

Insider Trade Summary

Grant/Award: 339.36 shares

Grant/Award 1 txn

Insider Simons Doyle

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Phantom Stock	339.36	$116.79	$40K

Holdings After Transaction: Phantom Stock — 46,213.296 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 dividends paid on Common Stock as if reinvested in Phantom Shares.

Key Figures

Phantom stock granted: 339.3600 units Grant reference price: $116.7900 per unit Total phantom holdings after grant: 46,213.2960 units +2 more

5 metrics

Phantom stock granted 339.3600 units Grant under Directors Deferred Compensation Plan on 2026-07-06

Grant reference price $116.7900 per unit Assigned value for phantom stock award

Total phantom holdings after grant 46,213.2960 units Director’s phantom stock balance following transaction

Underlying common stock equivalence 339.3600 shares Each phantom share equals one IRM common share economically

Exercise price $0.0000 Phantom stock has no exercise cost to the director

Key Terms

Phantom Stock, Directors Deferred Compensation Plan, economic equivalent, dividends paid on Common Stock as if reinvested

4 terms

Phantom Stock financial

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

A phantom stock is a form of compensation that gives employees or executives the benefits of stock ownership, such as the increase in stock value, without actually giving them real shares. It acts like a promise to pay the employee the equivalent value of company stock later, often as a bonus or incentive. This allows companies to motivate and reward staff without diluting ownership or transferring actual shares.

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"

dividends paid on Common Stock as if reinvested financial

"give effect to dividends paid on Common Stock as if reinvested in Phantom Shares"

FAQ

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

What did IRON MOUNTAIN INC (IRM) director Doyle Simons report on this Form 4?

Doyle Simons reported receiving 339.3600 phantom stock units as a compensation-related grant. The award is tied to Iron Mountain’s Directors Deferred Compensation Plan and represents economic exposure equivalent to common shares without an immediate cash purchase or sale in the open market.

Is the IRM Form 4 transaction a buy or sell of common stock?

The filing shows an acquisition of phantom stock units, not an open-market buy or sell of common shares. It reflects a grant under a deferred compensation plan, classified as a derivative award economically linked to Iron Mountain common stock for the reporting director.

How many phantom stock units does Doyle Simons hold after this IRM grant?

After the reported grant, Doyle Simons holds 46,213.2960 phantom stock units directly. These units track the value of Iron Mountain common stock and will be paid in actual shares after disability or the end of his board service, per the plan’s terms.

What are phantom stock units in the context of IRON MOUNTAIN INC (IRM)?

Phantom stock units are bookkeeping entries that mirror Iron Mountain’s common stock value. Each unit is economically equivalent to one share of common stock and is payable in shares later, often used for deferred director or executive compensation instead of immediate stock or cash.

When will Doyle Simons receive IRM common stock for these phantom shares?

The phantom stock will be settled in Iron Mountain common stock following Simons’ disability or when he ceases serving as a director. Until then, the units accrue value like common stock, including dividend equivalents treated as reinvested phantom shares under the plan.

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

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Accepted by SEC EDGAR 07/07/2026 - 04:39 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^*

Simons Doyle

(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)
07/06/2026

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)	07/06/2026		A		339.36(2)		(1)	(1)	Common Stock	339.36	$116.79	46,213.296	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 dividends paid on Common Stock as if reinvested in Phantom Shares.

Remarks:

	/s/ Keely Stewart, under Power of Attorney dated April 17, 2023 from Doyle R. Simons	07/07/2026
	** 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)