Iron Mountain Issues $1.5B 6.25% Notes

Published: June 26, 2026

IRON MOUNTAIN INC

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Iron Mountain Incorporated (NYSE: IRM) has raised $1.5 billion through 6.25% senior unsecured notes due 2035.
The issuance adds long-term fixed-rate borrowing to Iron Mountain's capital structure; company reported $16.4 billion total debt with a 5.0% weighted-average coupon for 2025.

Historical Context

This issuance sits against a multi-year strategic backdrop the company laid out in its 2025 filings. Iron Mountain reported $6.9017 billion in revenue for 2025 with 12.2% year-over-year growth and adjusted EBITDA of $2,574 million. The business mix is heavily weighted to recurring storage rental (58.7% of 2025 revenue) and complementary services (41.3%). The company operates across 61 countries with roughly 1,340 locations, stores more than 740 million cubic feet of physical volume, and runs a Global Data Center segment comprising 31 data centers (488 MW capacity, 97% leased as of Dec. 31, 2025). Strategic initiatives cited in filings include Project Matterhorn (global operating model and AI/ML integration), an emphasis on data-center leasing and ALM expansion, and a three-year capex plan (stated $1.95 billion ex-acquisitions). The new 2035 notes extend Iron Mountain’s fixed-rate financing profile while investors await updated post-issuance leverage figures and any disclosure on uses of proceeds.

Deal details and immediate implications

Iron Mountain's $1.5 billion of 6.25% senior notes due 2035 represents a multi-year fixed-rate issuance that extends the company's long-term maturities. The notes are senior unsecured indebtedness and carry a fixed coupon of 6.25% through maturity in 2035. The company summary provided confirms the size and coupon but does not disclose specific uses of proceeds or concurrent financing activity. Given the stated 2025 debt profile ($16.4 billion of debt at a 5.0% weighted-average coupon), this transaction increases the company's outstanding long-term fixed-rate obligations and locks in financing costs for the term of the notes.

Balance-sheet and covenant context

Iron Mountain entered 2026 with a balance-sheet profile that included $16.4 billion of debt and measured leverage and coverage metrics described in filings. Key covenant-related metrics from the company profile include a net lease-adjusted leverage of 4.9x (maximum covenant 7.0x) and a fixed-charge coverage ratio of 2.5x (minimum covenant 1.5x). The new $1.5 billion issuance increases reported indebtedness and will be material to leverage calculations, but the company’s stated covenant cushions indicate available headroom under the provided covenant limits as of the last reported metrics. Investors should monitor subsequent filings for updated leverage and coverage ratios reflecting the notes.

Interest-rate and refinancing considerations

The fixed 6.25% coupon for nearly a decade provides rate certainty for that tranche of debt. Iron Mountain’s existing weighted-average coupon of 5.0% (2025) implies the new notes carry a premium to the 2025 average borrowing cost; however, they also lock in long-term funding and defer near-term refinancing needs for the notional amount. Given the company’s profile as an S&P 500 REIT with $6.9 billion revenue (2025) and recurring cash flows from storage rental and service lines, management likely views fixed-rate long-dated debt as a way to stabilize financing costs amid interest-rate variability. The filings list interest-rate sensitivity and refinancing risk as principal macro risks to monitor.

What investors should watch next

1) Updated leverage and fixed-charge coverage metrics in subsequent periodic filings to see the issuance’ effect on covenant ratios. 2) Disclosure of proceeds usage or repayment of existing borrowings, if any, which will clarify whether the notes financed growth, general corporate purposes, or refinanced nearer-term maturities. 3) Operating performance trends (organic growth, storage volumes, and data center leasing) that underpin cash flow available to service higher fixed interest expense. The company’s 2025 operating metrics (58.7% of revenue from storage rental, 41.3% from services, adjusted EBITDA $2,574M) remain central to assessing coverage of interest obligations.

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Jun 26, 2026

Direct News

Historical Context

Deal details and immediate implications

Balance-sheet and covenant context

Interest-rate and refinancing considerations

What investors should watch next

Investor FAQ

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