Iron Mountain Inc.
Iron Mountain Incorporated (IRM)
Overview
Iron Mountain is a global information management and data center services company, structured since 2014 as a specialty real estate investment trust (REIT). Headquartered in Portsmouth, New Hampshire (having relocated from Boston in 2023), the company traces its roots to 1951, when it was founded by Herman Knaust as "Iron Mountain Atomic Storage Corporation," using a decommissioned iron ore mine in Kingston, New York, to store business records and, briefly, to preserve corporate microfilm records against the threat of nuclear attack. Today Iron Mountain serves more than 240,000 customers — including roughly 95% of the Fortune 1000 — across around 60 countries, operating more than 1,500 facilities worldwide. The company generated approximately $6.9 billion in revenue in 2025 and employs roughly 29,000–30,000 people globally, making it one of the largest players in physical records storage and an increasingly significant operator of enterprise data centers.
What They Do & How They Make Money
Iron Mountain's core, decades-old business is storing physical records, media, and other valuable assets for corporations, government agencies, law firms, healthcare systems, and other organizations that must retain documents for legal, regulatory, or operational reasons. Customers pay recurring storage fees (billed per box, container, or cubic foot) for materials housed in Iron Mountain's warehouses and former mines, plus service fees for related activities such as retrieval, delivery, scanning, indexing, and secure destruction/shredding at end of life. This storage-and-services model produces highly durable, contractually recurring revenue: once a customer's records are on Iron Mountain's shelves, switching costs and inertia keep them there for years, and the perpetual accumulation of new records typically outpaces destruction, so the storage base tends to grow steadily.
Layered on top of that legacy business, Iron Mountain has built a second growth engine in digital infrastructure. It designs, builds, and operates wholesale and hyperscale data centers that it leases to cloud providers, large enterprises, and government customers who need secure, high-capacity colocation space — a business it scaled substantially through the 2017 acquisition of IO Data Centers' U.S. operations and continued organic buildout since. It also offers digital transformation services (scanning paper archives into searchable digital files, workflow and content management software), information security and secure destruction, and IT asset lifecycle management (ALM) — the secure decommissioning, data-wiping, and remarketing or recycling of retired servers and electronics, a business Iron Mountain expanded in 2024 with its roughly $200 million acquisition of Regency Technologies. In short, Iron Mountain makes money both from the "physical" side (rent for storing boxes and assets) and the "digital" side (rent for data center capacity, plus fees for digitization, security, and IT decommissioning services).
Business Segments
Iron Mountain reports its results primarily across two major operating businesses, supplemented by a smaller corporate/other category:
- Global Records and Information Management (RIM): The company's largest and most stable segment by revenue, covering physical records storage, records management, secure shredding and destruction, digital solutions/document scanning, and information governance services. This segment throws off substantial, highly predictable cash flow and funds much of the company's dividend and growth investment.
- Global Data Center Business: Iron Mountain's fastest-growing segment, encompassing colocation and wholesale data center leasing to hyperscale cloud, AI infrastructure, and enterprise customers. This segment has driven much of the company's recent double-digit revenue growth (overall company revenue grew from about $5.1 billion in 2022 to about $6.9 billion in 2025) as demand for data center capacity — accelerated by cloud migration and AI workloads — has surged.
- Asset Lifecycle Management (ALM) and other services: A smaller but growing category covering IT asset disposition, data destruction for electronics, and related services, bolstered by the Regency Technologies acquisition.
- Corporate and Other: Residual corporate costs and minor business lines not allocated to the two main segments.
The RIM segment still supplies the majority of revenue and nearly all of Iron Mountain's REIT-qualifying, storage-driven cash flow, while the data center segment — though smaller in absolute revenue — commands investor attention because of its higher growth rate and capital-intensive expansion (new builds funded by debt and equity issuance).
Competitors
In records and information management, Iron Mountain's main direct competitor was historically Recall Holdings, which Iron Mountain itself acquired in 2016; today it faces smaller regional and national players such as Access Corp (Access Information Management) and various local document-storage and shredding companies, as well as the ongoing structural threat of enterprises simply digitizing records and eliminating physical storage altogether. In digital transformation and information governance software, it competes with content-management and workflow vendors.
In its data center business, Iron Mountain competes with much larger, pure-play data center and colocation operators, including Digital Realty Trust, Equinix, CyrusOne, QTS Realty (Blackstone), Vantage Data Centers, and NTT Global Data Centers, as well as the hyperscalers' own build-to-suit and self-operated capacity (Amazon, Microsoft, Google), which can reduce third-party colocation demand for certain workloads. In IT asset disposition, competitors include Sims Lifecycle Services and various regional e-waste/ITAD specialists.
Competitive Position
Iron Mountain's core moat is physical and behavioral inertia: once a customer's boxes are stored, the cost and disruption of moving them (or digitizing everything) are high relative to the storage fee, and destruction/turnover rates are historically low, so the installed base of stored records is sticky and grows organically even without new customer wins. This gives the RIM segment REIT-like characteristics — predictable, high-margin, recurring cash flow — that support a stable dividend (the company has a long record of dividend payments as a REIT) and provide a low-risk funding base for higher-growth investments elsewhere.
The strategic bet on data centers is Iron Mountain's attempt to convert its enterprise trust, security credentials, real estate expertise, and existing customer relationships into a share of the data center boom driven by cloud computing and AI. This diversification is a double-edged sword: it has been the primary driver of recent revenue and stock-price acceleration, but data centers are a far more capital-intensive, competitively crowded, and cyclically sensitive business than legacy records storage, requiring large ongoing capex, exposing the company to power availability and construction-cost risk, and pitting it against far larger specialized REITs like Digital Realty and Equinix.
Key risks include the secular decline of paper-based recordkeeping as enterprises digitize (a long-run headwind to the core RIM business, though offset so far by growth in newer verticals and geographies), execution and funding risk in the capital-intensive data center buildout, interest-rate sensitivity typical of REITs, and customer concentration in large enterprise and government contracts. Iron Mountain's scale, global footprint, long-standing customer relationships, and diversified service set (storage, digital, security, ALM, data centers) nonetheless give it a broader platform than most pure-play competitors in either records management or data centers individually.