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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Current Assets:    
Cash and cash equivalents $ 195,210 $ 155,716
Accounts receivable (less allowances of $106,587 and $86,712 as of September 30, 2025 and December 31, 2024, respectively) 1,371,367 1,291,379
Prepaid expenses and other 314,293 244,127
Total Current Assets 1,880,870 1,691,222
Property, Plant and Equipment:    
Property, plant and equipment 13,975,948 11,985,997
Less—Accumulated depreciation (4,838,448) (4,354,398)
Property, Plant and Equipment, Net 9,137,500 7,631,599
Other Assets, Net:    
Goodwill 5,269,541 5,083,817
Customer and supplier relationships and other intangible assets 1,253,919 1,274,731
Operating lease right-of-use assets 2,455,450 2,489,893
Other 635,573 545,853
Total Other Assets, Net 9,614,483 9,394,294
Total Assets 20,632,853 18,717,115
Current Liabilities:    
Current portion of long-term debt 699,320 715,109
Accounts payable 658,138 678,716
Accrued expenses and other current liabilities (includes current portion of operating lease liabilities) 1,151,107 1,366,568
Deferred revenue 347,018 326,882
Total Current Liabilities 2,855,583 3,087,275
Long-term Debt, net of current portion 15,494,236 13,003,977
Long-term Operating Lease Liabilities, net of current portion 2,283,504 2,334,826
Other Long-term Liabilities 389,106 312,199
Deferred Income Taxes 218,223 205,341
Commitments and Contingencies
Redeemable Noncontrolling Interests 75,353 78,171
Iron Mountain Incorporated Stockholders' (Deficit) Equity:    
Preferred stock (par value $0.01; authorized 10,000,000 shares; none issued and outstanding) 0 0
Common stock (par value $0.01; authorized 400,000,000 shares; issued and outstanding 295,504,799 and 293,592,637 shares as of September 30, 2025 and December 31, 2024, respectively) 2,955 2,936
Additional paid-in capital 4,730,575 4,647,330
(Distributions in excess of earnings) Earnings in excess of distributions (5,236,868) (4,583,436)
Accumulated other comprehensive items, net (378,624) (569,952)
Total Iron Mountain Incorporated Stockholders' (Deficit) Equity (881,962) (503,122)
Noncontrolling Interests 198,810 198,448
Total (Deficit) Equity (683,152) (304,674)
Total Liabilities and (Deficit) Equity $ 20,632,853 $ 18,717,115