Iron Mountain officer plans sale of 6,000 shares

IRON MOUNTAIN INC (IRM) is the issuer for a Rule 144 notice filed on behalf of Mark Kidd, an officer, covering a proposed sale of 6,000 shares of common stock through Fidelity Brokerage Services LLC on the NYSE.

Rhea-AI Filing Summary

IRON MOUNTAIN INC (IRM) is the issuer for a Rule 144 notice filed on behalf of Mark Kidd, an officer, covering a proposed sale of 6,000 shares of common stock through Fidelity Brokerage Services LLC on the NYSE. The shares have an aggregate value of $693,600. The filing notes that IRON MOUNTAIN INC had 297,702,812 common shares outstanding as of September 1, 2026. The shares to be sold were acquired via restricted stock vesting awards granted between 2017 and 2021 as compensation.

Key Figures

Shares to be sold: 6,000 shares of common stock Aggregate market value of planned sale: $693,600 Shares outstanding: 297,702,812 shares of common stock +3 more

6 metrics

Shares to be sold 6,000 shares of common stock Planned sale under Rule 144 through Fidelity Brokerage Services LLC

Aggregate market value of planned sale $693,600 Value of 6,000 IRM common shares to be sold

Shares outstanding 297,702,812 shares of common stock IRON MOUNTAIN INC common shares outstanding as of September 1, 2026

Sale on June 1, 2026 6,000 shares for $760,200 Common stock sold by Mark Kidd during past three months

Sale on July 1, 2026 6,000 shares for $753,720 Common stock sold by Mark Kidd during past three months

Sale on August 7, 2026 6,000 shares for $736,200 Common stock sold by Mark Kidd during past three months

Key Terms

Rule 144, Restricted Stock Vesting, attorney-in-fact

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Vesting financial

"Common | 03/09/2017 | Restricted Stock Vesting | Issuer"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

attorney-in-fact regulatory

"as attorney-in-fact for Mark Kidd"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

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

What does the Form 144 filing for IRM disclose about Mark Kidd's planned sale?

The Form 144 for IRM discloses that Mark Kidd plans to sell 6,000 shares of IRON MOUNTAIN INC common stock through Fidelity Brokerage Services LLC, with an aggregate value of $693,600, to be sold on the NYSE.

How many IRON MOUNTAIN INC (IRM) shares has Mark Kidd sold in the past three months?

Over the past three months, Mark Kidd reported three sales of IRON MOUNTAIN INC common stock: 6,000 shares for $760,200 on June 1, 2026; 6,000 shares for $753,720 on July 1, 2026; and 6,000 shares for $736,200 on August 7, 2026.

What is the outstanding share count of IRON MOUNTAIN INC (IRM) referenced in the Form 144?

The Form 144 states that IRON MOUNTAIN INC had 297,702,812 shares of common stock outstanding as of September 1, 2026. This figure is used in the Rule 144 notice as the issuer’s outstanding share count.

How did Mark Kidd acquire the IRM shares covered by this Form 144?

The IRM shares were acquired through restricted stock vesting from the issuer as compensation. Vesting dates and amounts include 428 shares on March 9, 2017, 992 shares on February 15, 2020, 2,000 shares on February 16, 2020, 224 shares on February 15, 2021, and 2,356 shares on February 16, 2021.

Who is executing the planned IRM share sale for Mark Kidd under this Form 144?

The planned sale of IRM shares is to be executed through Fidelity Brokerage Services LLC. The Form 144 is signed by Jennifer Ruchti, as a duly authorized representative of Fidelity Brokerage Services LLC, acting as attorney-in-fact for Mark Kidd.

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

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Available on EDGAR 09/01/2026 - 09:52 AM EDT Accepted by SEC EDGAR 09/01/2026 - 09:51 AM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001732058
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	IRON MOUNTAIN INC
SEC File Number	001-13045
Address of Issuer	85 NEW HAMPSHIRE AVENUE, SUITE 150 PEASE INTERNATIONAL TRADEPORT PORTSMOUTH NEW HAMPSHIRE 03801
Phone	617-535-4781
Name of Person for Whose Account the Securities are To Be Sold	Kidd Mark
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	6000	693600.00	297702812	09/01/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	03/09/2017	Restricted Stock Vesting	Issuer			428	03/09/2017	Compensation
Common	02/15/2020	Restricted Stock Vesting	Issuer			992	02/15/2020	Compensation
Common	02/16/2020	Restricted Stock Vesting	Issuer			2000	02/16/2020	Compensation
Common	02/15/2021	Restricted Stock Vesting	Issuer			224	02/15/2021	Compensation
Common	02/16/2021	Restricted Stock Vesting	Issuer			2356	02/16/2021	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Mark Kidd 85 New Hampshire Avenue Suite 150 Portsmouth NH 03801	Common	06/01/2026	6000	760200.00
Mark Kidd 85 New Hampshire Avenue Suite 150 Portsmouth NH 03801	Common	07/01/2026	6000	753720.00
Mark Kidd 85 New Hampshire Avenue Suite 150 Portsmouth NH 03801	Common	08/07/2026	6000	736200.00

144: Remarks and Signature

Remarks
Date of Notice	09/01/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	03/20/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Jennifer Ruchti, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Mark Kidd
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)