Mark Kidd sells 18,000 shares (IRM) across Q1 2026 — Form 144

Rhea-AI Filing Summary

Form 144 filing reporting insider dispositions of Common Stock. The filing lists three sales by Mark Kidd: 6,000 shares on 03/02/2026 for $643,620.00, 6,000 shares on 02/20/2026 for $649,020.00, and 6,000 shares on 01/02/2026 for $498,600.00. The record also shows restricted stock vesting entries dated 03/01/2024 (342 shares) and 02/23/2023 (5,658 shares) attributed to the issuer.

Insights

Insider Transactions Analyst

Routine insider dispositions recorded: three open-market sales by Mark Kidd across Q1 2026.

The filing lists three discrete dispositions: $643,620.00 for 6,000 shares on 03/02/2026, $649,020.00 for 6,000 shares on 02/20/2026, and $498,600.00 for 6,000 shares on 01/02/2026. These are presented as completed sales in the “Securities Sold During The Past 3 Months” section.

Timing and sequence suggest routine liquidity events; the excerpt also lists prior restricted stock vesting (342 shares on 03/01/2024 and 5,658 shares on 02/23/2023. The filing does not state whether sales were planned under a trading plan or the post-transaction holdings, so cash-flow and proportionality context are not provided in the excerpt.

Key Figures

Sale on 03/02/2026: 6,000 shares for $643,620.00 Sale on 02/20/2026: 6,000 shares for $649,020.00 Sale on 01/02/2026: 6,000 shares for $498,600.00 +2 more

5 metrics

Sale on 03/02/2026 6,000 shares for $643,620.00 Securities Sold During The Past 3 Months

Sale on 02/20/2026 6,000 shares for $649,020.00 Securities Sold During The Past 3 Months

Sale on 01/02/2026 6,000 shares for $498,600.00 Securities Sold During The Past 3 Months

Restricted stock vesting 03/01/2024 342 shares Restricted Stock Vesting (Compensation)

Restricted stock vesting 02/23/2023 5,658 shares Restricted Stock Vesting (Compensation)

Key Terms

Form 144, Restricted Stock Vesting, Securities Sold During The Past 3 Months

3 terms

Form 144 regulatory

"Securities Sold During The Past 3 Months"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Restricted Stock Vesting financial

"Restricted Stock Vesting | Issuer | 342 | 03/01/2024"

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.

Securities Sold During The Past 3 Months regulatory

"Mark Kidd | Common | 03/02/2026 | 6000 | 643620.00"

FAQ

What sales does IRM Form 144 disclose by Mark Kidd?

The filing discloses three sales by Mark Kidd: 6,000 shares on 03/02/2026 for $643,620.00, 6,000 shares on 02/20/2026 for $649,020.00, and 6,000 shares on 01/02/2026 for $498,600.00.

Does the Form 144 show any restricted stock vesting for IRM?

Yes. The excerpt lists restricted stock vesting events: 342 shares on 03/01/2024 and 5,658 shares on 02/23/2023, each labeled as compensation and attributed to the issuer.

Who appears as the broker or transfer agent on the filing?

The filing lists Fidelity Brokerage Services LLC at 900 Salem Street, Smithfield RI, and associates a 6,000-share entry with a 04/01/2026 record and the NYSE identifier in the securities section.

Are proceeds or post-transaction holdings provided for these sales?

The excerpt gives gross proceeds for each sale (exact dollar amounts listed) but does not disclose post-transaction holdings or whether sales were executed under a pre-arranged trading plan.

What section lists the recent sales in the Form 144 excerpt?

The transactions appear under the section titled "Securities Sold During The Past 3 Months", which itemizes each sale with date, share count, and dollar amount for the reported dispositions.

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

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Accepted by SEC EDGAR 04/01/2026 - 10:12 AM 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	616260.00	295835206	04/01/2026	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	03/01/2024	Restricted Stock Vesting	Issuer			342	03/01/2024	Compensation
Common	02/23/2023	Restricted Stock Vesting	Issuer			5658	02/23/2023	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	03/02/2026	6000	643620.00
Mark Kidd 85 New Hampshire Avenue Suite 150 Portsmouth NH 03801	Common	02/20/2026	6000	649020.00
Mark Kidd 85 New Hampshire Avenue Suite 150 Portsmouth NH 03801	Common	01/02/2026	6000	498600.00

144: Remarks and Signature

Remarks
Date of Notice	04/01/2026
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/Wade Moss, 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)