Iron Mountain (NYSE: IRM) investor files Rule 144 to sell 6,000 shares

Rhea-AI Filing Summary

Iron Mountain shareholder Mark Kidd has filed a Form 144 notice to sell 6,000 shares of common stock through Fidelity Brokerage Services LLC on the NYSE. The planned sale has an aggregate market value of $510,000, compared with 295,589,491 common shares outstanding.

The shares to be sold come from restricted stock that vested on 03/01/2024 and 03/01/2025, totaling 1,857 and 4,143 shares respectively, received as compensation from the issuer. Over the past three months, Mark Kidd has reported multiple open-market sales of Iron Mountain common stock, including 6,000 shares sold on 09/02/2025 for $546,300.00 and additional blocks of 6,000 and 7,306 shares in October and early November.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	510000.00	295589491	12/01/2025	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			1857	03/01/2024	Compensation
Common	03/01/2025	Restricted Stock Vesting	Issuer			4143	03/01/2025	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	09/02/2025	6000	546300.00
Mark Kidd 85 New Hampshire Avenue Suite 150 Portsmouth NH 03801	Common	10/01/2025	6000	609780.00
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

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

How many Iron Mountain (IRM) shares are being proposed for sale in this Form 144?

The notice states that 6,000 shares of Iron Mountain common stock are proposed to be sold, with an aggregate market value of $510,000.00.

On which exchange and through which broker will the IRM shares be sold?

The Form 144 indicates the 6,000 Iron Mountain common shares are to be sold on the NYSE through Fidelity Brokerage Services LLC, 900 Salem Street, Smithfield, RI 02917.

How were the Iron Mountain (IRM) shares being sold under Form 144 acquired?

The shares come from restricted stock vesting from the issuer: 1,857 common shares vested on 03/01/2024 and 4,143 common shares vested on 03/01/2025, both described as compensation.

How many Iron Mountain (IRM) shares are outstanding according to this notice?

The Form 144 lists 295,589,491 common shares of Iron Mountain as outstanding in the securities information section.

What Iron Mountain (IRM) stock sales has Mark Kidd reported over the past 3 months?

The notice reports several sales of Iron Mountain common stock by Mark Kidd, including 6,000 shares on 09/02/2025 for $546,300.00, 6,000 shares on 10/01/2025 for $609,780.00, 7,306 shares on 10/31/2025 for $736,590.92, and 6,000 shares on 11/03/2025 for $615,060.00.

What does the Form 144 representation say about non-public information on Iron Mountain (IRM)?

By signing the notice, the selling person represents that they do not know any material adverse information about Iron Mountain’s current or prospective operations that has not been publicly disclosed.