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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
FORM 8-K
CURRENT REPORT PURSUANT
TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934
Date of report (Date of earliest event reported): November 5, 2025
IRON MOUNTAIN INCORPORATED
(Exact Name of Registrant as Specified in Its Charter)
Delaware
(State or Other Jurisdiction of Incorporation)

1-13045 |  | 23-2588479
(Commission File Number) |  | (IRS Employer Identification No.)

85 New Hampshire Avenue, Suite 150 Portsmouth, New Hampshire
(Address of Principal Executive Offices)
03801
(Zip Code)
(617) 535-4766
(Registrant’s Telephone Number, Including Area Code)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities Registered Pursuant to Section 12(b) of the Act:

Title of Each Class |  | Trading Symbol(s) |  | Name Of Each Exchange On Which Registered
Common Stock, $.01 par value per share |  | IRM |  | New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).
Emerging growth company ☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐
Item 2.02. Results of Operations and Financial Condition.
On November 5, 2025, Iron Mountain Incorporated, or the Company, issued an earnings press release and supplemental financial information for the quarter ended September 30, 2025. In addition, the Company will be using a slide presentation during its earnings conference call. Copies of the earnings press release, slide presentation and supplemental financial information are furnished as Exhibits 99.1, 99.2 and 99.3, respectively, hereto and posted on the Company’s website, www.ironmountain.com, under “Investors.”
The information in this report, including Exhibits 99.1, 99.2 and 99.3 shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 (the “Exchange Act”) or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the

Securities Act of 1933 or the Exchange Act, regardless of any general incorporation language in such filing.
Item 9.01. Financial Statements and Exhibits.
(d) Exhibits

Exhibit Number |  | Description

99.1 Third Quarter 2025 Earnings Press Release (Furnished herewith.)
99.2 Third Quarter 2025 Earnings Conference Call Presentation (Furnished herewith.)
99.3 Third Quarter 2025 Supplemental Financial Information (Furnished herewith)
104 The cover page from this Current Report on Form 8-K, formatted as Inline XBRL.

SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

IRON MOUNTAIN INCORPORATED
By: | /s/ Barry Hytinen
Name: | Barry Hytinen
Title: | Executive Vice President and Chief Financial Officer

Date: November 5, 2025