Iron Mountain insider plans sale of 6,000 common shares

Iron Mountain (IRM) insider Mark Kidd has filed a notice of proposed sale of company shares under Rule 144.

Rhea-AI Filing Summary

Iron Mountain (IRM) insider Mark Kidd has filed a notice of proposed sale of company shares under Rule 144. The filing reports a planned sale of 6,000 shares of common stock through Fidelity Brokerage Services LLC, with an aggregate market value of 498600.00. These shares are part of 295,589,491 common shares outstanding and are expected to be sold on or about 01/02/2026 on the NYSE.

The securities to be sold were acquired on 03/01/2024 through restricted stock vesting from the issuer as compensation. The notice also discloses prior sales by the same seller over the past three months, including 7,306 shares sold on 10/31/2025 for gross proceeds of 736,590.92, 6,000 shares on 11/03/2025 for 615,060.00, and 6,000 shares on 12/01/2025 for 510,000.00.

FAQ

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

What insider transaction does this Form 144 report for Iron Mountain (IRM)?

The notice reports that Mark Kidd plans to sell 6,000 shares of Iron Mountain common stock under Rule 144 through Fidelity Brokerage Services LLC.

What is the market value of the IRM shares planned for sale in this filing?

The planned sale covers 6,000 common shares of Iron Mountain with an aggregate market value of 498,600.00 as stated in the filing.

How many Iron Mountain shares are outstanding according to this Form 144?

The document states that there are 295,589,491 Iron Mountain common shares outstanding at the time of the planned transaction.

When and how were the IRM shares to be sold originally acquired?

The 6,000 shares to be sold were acquired on 03/01/2024 via restricted stock vesting from the issuer, identified as compensation.

On which exchange and around what date are the planned IRM share sales expected?

The filing indicates an approximate sale date of 01/02/2026 and lists the NYSE as the securities exchange.

What IRM share sales by the same insider occurred in the past three months?

The notice discloses prior sales by Mark Kidd of 7,306 shares on 10/31/2025 for 736,590.92, 6,000 shares on 11/03/2025 for 615,060.00, and 6,000 shares on 12/01/2025 for 510,000.00.

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

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Accepted by SEC EDGAR 01/02/2026 - 09:51 AM EST 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	498600.00	295589491	01/02/2026	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	03/01/2024	Restricted Stock Vesting	Issuer			6000	03/01/2024	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	10/31/2025	7306	736590.92
Mark Kidd 85 New Hampshire Avenue, Suite 150 Portsmouth NH 03801	Common	11/03/2025	6000	615060.00
Mark Kidd 85 New Hampshire Avenue, Suite 150 Portsmouth NH 03801	Common	12/01/2025	6000	510000.00

144: Remarks and Signature

Remarks
Date of Notice	01/02/2026
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)