STOCK TITAN

Iron Mountain (NYSE: IRM) director gains stock award and holds 45,874 phantom units

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Simons Doyle reported acquisition or exercise transactions in this Form 4 filing.

IRON MOUNTAIN INC director Doyle Simons reported new equity-based compensation and deferred awards. He received a grant of 1,892 shares of common stock on May 7, 2026, tied to restricted stock units that vested in full on the grant date. He also holds phantom stock units economically equivalent to 45,873.936 shares of common stock under the Directors Deferred Compensation Plan, which will be paid out in common stock after his disability or when he stops serving as a director.

Positive

  • None.

Negative

  • None.
Insider Simons Doyle
Role null
Type Security Shares Price Value
Grant/Award Common Stock, par value $.01 per share 1,892 $0.00 --
holding Phantom Stock -- -- --
Holdings After Transaction: Common Stock, par value $.01 per share — 1,892 shares (Direct, null); Phantom Stock — 45,873.936 shares (Direct, null)
Footnotes (1)
  1. Consists of shares issuable upon the settlement of restricted stock units ("RSUs") granted on May 7, 2026. The RSUs vest in their entirety on the grant date. 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.
Common shares granted 1,892 shares Restricted stock units granted and vested on May 7, 2026
Phantom stock equivalent shares 45,873.936 shares Economic equivalent of common stock under Directors Deferred Compensation Plan
Common stock holdings after grant 1,892 shares Total common shares directly held following the May 7, 2026 award
Exercise price of phantom stock $0.0000 per unit Phantom stock units economically track common stock value without exercise cost
Phantom Stock financial
"the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock"
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.
restricted stock units ("RSUs") financial
"Consists of shares issuable upon the settlement of restricted stock units ("RSUs") granted on May 7, 2026."
Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.
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."
SEC Form 4
FORM 4UNITED 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)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
05/07/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock, par value $.01 per share05/07/2026A1,892(1)A$01,892D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Phantom Stock(2) (2) (2)Common Stock45,873.93645,873.936D
Explanation of Responses:
1. Consists of shares issuable upon the settlement of restricted stock units ("RSUs") granted on May 7, 2026. The RSUs vest in their entirety on the grant date.
2. 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.
Remarks:
/s/ Keely Stewart, under Power of Attorney dated April 17, 2023 from Doyle R. Simons05/11/2026
** Signature of Reporting PersonDate
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)

FAQ

What insider transaction did IRON MOUNTAIN INC (IRM) director Doyle Simons report?

Doyle Simons reported an equity award rather than a market trade. He received 1,892 shares of IRON MOUNTAIN INC common stock from restricted stock units granted and fully vested on May 7, 2026, reflecting compensation for his board service.

How many IRON MOUNTAIN INC (IRM) shares did Doyle Simons acquire in this Form 4?

He acquired 1,892 shares of common stock. These shares came from restricted stock units that were granted and vested in full on May 7, 2026, representing non-cash director compensation rather than an open-market purchase of stock.

What are the phantom stock holdings reported by Doyle Simons at IRON MOUNTAIN INC (IRM)?

He holds phantom stock units economically equivalent to 45,873.936 shares of common stock. Under the Directors Deferred Compensation Plan, these units will be settled in IRON MOUNTAIN INC common stock after his disability or when his board service ends.

Were there any open-market buys or sells by Doyle Simons in this IRM Form 4?

No open-market buys or sells were reported. The filing shows a grant of 1,892 common shares from vested restricted stock units and a deferred phantom stock balance, with no purchase or sale transactions in the market disclosed.

When do Doyle Simons’ IRON MOUNTAIN INC (IRM) phantom shares become payable?

The phantom shares become payable in common stock after his disability or when he ceases to serve as a director. Each phantom share is the economic equivalent of one share of IRON MOUNTAIN INC common stock, under the Directors Deferred Compensation Plan.