Iron Mountain (IRM) Q4 2025 earnings review
Transformation Complete: From Storage Utility to Growth Engine
Iron Mountain has successfully shed its reputation as a slow-growth storage REIT. Q4 2025 delivered a blistering 17% revenue growth and 17% EBITDA expansion, proving the 'Project Matterhorn' strategy is working. The narrative has shifted decisively: the physical records business (RIM) is now the funding engine for the high-octane Data Center and Asset Lifecycle Management (ALM) segments, which collectively grew over 40%. Management's FY26 guidance—forecasting another year of double-digit revenue and profit growth—signals that this acceleration is structural, not a one-off.
🐂 Bull Case
The Data Center segment isn't just growing top-line (+39%); it is becoming more profitable. Adjusted EBITDA margins for the segment hit 51.5% in Q4 (up from 43.6% in 24Q3), and the company secured 110 new/expansion leases in the quarter.
Global RIM (physical storage) continues to defy 'paperless' fears, growing 9% reported and 7% organically. High retention (93.3%) allows IRM to pass through inflation-beating price increases, generating the cash flow needed to fund the growth segments.
🐻 Bear Case
While EBITDA and AFFO soared, Net Income fell 12% YoY to $93M, dragged down by foreign exchange impacts and rising interest expenses ($220M in Q4 vs $194M a year ago). GAAP profitability is not tracking with operational metrics.
Net lease-adjusted leverage sits at 4.9x. While within the 4.5x-5.5x target, this is substantial for a company with an aggressive capital expenditure plan ($1.8B growth capex planned for 2025/26), leaving little room for error if rates stay elevated.
⚖️ Verdict: 🟢🟢
Strong Bullish. IRM has successfully pivoted. The growth rate acceleration in Data Centers and ALM is real, margins are expanding, and the legacy business provides a stable floor. The FY26 guidance suggests the momentum will continue.
Key Themes
Data Center: The New Crown Jewel
Accelerating. Data Center revenue surged 39% YoY to $237M. More importantly, the 'Growth' businesses (Data Center + ALM) now account for substantial portions of the top line. With 488 MW operating and a 1.3 GW pipeline, IRM is effectively capitalizing on AI/Cloud demand. Renewal pricing was strong (+9% cash, +12% GAAP).
ALM (Asset Lifecycle Management) Hyper-Growth
Accelerating. ALM (housed in 'Corporate & Other') grew 53% YoY to $234M. This segment has evolved from a niche offering to a major revenue driver, capitalizing on the need for secure IT asset disposal. The sequential acceleration suggests cross-selling to the massive RIM customer base is gaining traction.
Interest Expense Drag
Stable/Negative. Interest expense rose 13% YoY to $220M. As the company funds its capital-intensive Data Center build-out (Growth CapEx was ~$525M in Q4 alone), the cost of debt continues to weigh on GAAP Net Income, causing the 14% drop in Reported EPS despite operational excellence.
Data Center Churn Uptick
Decelerating. Data Center churn ticked up to 1.7% in Q4 from a remarkably low 0.3% in Q3. While still low by industry standards, any trend change here warrants monitoring given the massive capital poured into this segment.
Operational Leverage
Improving. The narrative of 'empty calories' growth (revenue without profit) is debunked here. Adjusted EBITDA margin held firm at 38.3% despite the mix shift toward lower-margin Service revenue. Notably, Data Center EBITDA margin expanded significantly to 51.5%.
Other KPIs
Accelerating. Up 16% YoY, outpacing the 14% growth seen in FY24Q4. This is the critical metric for REIT dividend safety. The strong coverage (62.2% payout ratio) supported the 10% dividend hike announced in November.
Stable. Up 9% YoY (7% organic). While not the headline grabber, this segment provides the steady cash flow ($622M Adj. EBITDA) that services the debt and funds the data center construction. Storage rental rates increased, offsetting slight volume maturity.
Accelerating. Up 22% YoY. Service revenue is growing faster than storage rental (13%), driven by the ALM and Digital Solutions businesses. This mix shift usually pressures margins, but IRM managed to keep overall margins flat.
Guidance
Stable. The midpoint implies ~12% YoY growth, consistent with the 12.2% growth delivered in FY25. This indicates management sees no slowdown in demand for Data Center or ALM services.
Accelerating. Midpoint implies ~13% growth, slightly outpacing revenue growth, indicating further margin expansion is expected (operating leverage).
Decelerating. Midpoint implies ~11% growth, compared to 14% growth in FY25. While still double-digit, the slightly lower growth rate likely reflects higher share counts or interest expenses dampening the flow-through.
Key Questions
Data Center Churn Specifics
Churn increased to 1.7% in Q4 from 0.3% in Q3. Was this a specific customer loss, or a trend in a specific geography?
Net Income Divergence
Net Income dropped 12% while EBITDA rose 17%. Beyond FX, how much of this is structural interest expense that will persist into 2026?
ALM Margin Profile
With ALM growing 53%, what is the long-term margin target for this segment compared to the highly profitable Storage business?