Shares Outstanding for Iron Mountain (IRM)
According to Iron Mountain's latest reported financial statements, the company's latest reported diluted shares outstanding is 298.38M. Diluted weighted-average shares outstanding is the share count used to compute per-share metrics like EPS. Buybacks lower it; new issuance, stock-based compensation, and convertible securities raise it. Multiply by the stock price for market capitalization.
Headline figure above is from the reporting period ending (reported ). Chart and table below cover the full reported history back to .
Currently viewingShares OutstandingSwitch metric
Latest period
298.38M
YoY change
+0.5%
5Y CAGR
+0.6%
Peak year (2025)
297.82M
Latest annual
297.82M
Shares Outstanding history chart for Iron Mountain (IRM) from 1996 to 2025
Shares Outstanding history table for Iron Mountain (IRM) from 1996 to 2025
| Fiscal year | Period ended | Reported | Shares Outstanding | YoY |
|---|---|---|---|---|
| 2025 | 297.82M | +0.5% | ||
| 2024 | 296.23M | +0.8% | ||
| 2023 | 293.96M | +0.5% | ||
| 2022 | 292.44M | +0.5% | ||
| 2021 | 290.98M | +0.8% | ||
| 2020 | 288.64M | +0.3% | ||
| 2019 | 287.69M | +0.4% | ||
| 2018 | 286.65M | +7.4% | ||
| 2017 | 266.85M | +7.9% | ||
| 2016 | 247.27M | +16.6% | ||
| 2015 | 212.12M | +7.8% | ||
| 2014 | 196.75M | +2.3% | ||
| 2013 | 192.41M | +10.0% | ||
| 2012 | 174.87M | -10.8% | ||
| 2011 | 195.94M | -3.0% | ||
| 2010 | 201.99M | -1.1% | ||
| 2009 | 204.27M | +0.5% | ||
| 2008 | 203.29M | +0.6% | ||
| 2007 | 202.06M | +0.8% | ||
| 2006 | 200.46M | +1.2% | ||
| 2005 | 198.10M | +0.7% | ||
| 2004 | 196.76M | +0.8% | ||
| 2003 | 195.12M | +0.8% | ||
| 2002 | 193.66M | +2.9% | ||
| 2001 | 188.25M | +5.0% | ||
| 2000 | 179.30M | +59.3% | ||
| 1999 | 112.54M | +10.4% | ||
| 1998 | 101.98M | +74.8% | ||
| 1997 | 58.33M | +1.0% | ||
| 1996 | 57.76M | — |
Shares Outstanding values are taken from Iron Mountain's reported income statements (10-Q quarterly and 10-K annual filings with the U.S. Securities and Exchange Commission). Each row shows the period end date and the date the filing was reported; YoY compares each figure to the same period one year earlier. Amounts are in USD as filed.
Analysis
In 2025, Iron Mountain (IRM) diluted shares outstanding totalled 297.82M – edged up 0.5% year-over-year.
Across 2020–2025 (5 years), Iron Mountain diluted shares outstanding produced a CAGR of +0.6% – sustaining 13 straight years of year-over-year growth.
297.82M stands as the all-time-high annual diluted shares outstanding, posted in 2025, against a low of 57.76M during 1996.
Among 8 Real Estate peers, Iron Mountain (IRM) ranks 7th; the peer median for diluted shares outstanding is 410.36M.
Iron Mountain Shares Outstanding by Year
Iron Mountain Shares Outstanding 2025: 297.82M
Iron Mountain diluted shares outstanding in 2025 was 297.82M, edged up 0.5% from 2024. This figure represents the highest annual value in the available history.
Iron Mountain Shares Outstanding 2024: 296.23M
Iron Mountain diluted shares outstanding in 2024 was 296.23M, edged up 0.8% from 2023.
Iron Mountain Shares Outstanding 2023: 293.96M
Iron Mountain diluted shares outstanding in 2023 was 293.96M, edged up 0.5% from 2022.
Iron Mountain Shares Outstanding 2022: 292.44M
Iron Mountain diluted shares outstanding in 2022 was 292.44M, edged up 0.5% from 2021.
Iron Mountain Shares Outstanding 2021: 290.98M
Iron Mountain diluted shares outstanding in 2021 was 290.98M.
See more financial history for Iron Mountain (IRM).
Sector peers — Shares Outstanding
Companies in the same sector as Iron Mountain, ranked by their latest diluted shares outstanding.
| Company | Shares Outstanding | Sector |
|---|---|---|
| Prologis, Inc. (PLD) | 958.02M | Real Estate |
| Realty Income Corporation (O) | 904.79M | Real Estate |
| Welltower Inc. (WELL) | 679.52M | Real Estate |
| American Tower Corporation (AMT) | 469.14M | Real Estate |
| Digital Realty Trust, Inc. (DLR) | 351.57M | Real Estate |
| Simon Property Group, Inc. (SPG) | 326.02M | Real Estate |
| Public Storage (PSA) | 175.90M | Real Estate |
| Equinix, Inc. (EQIX) | 98.12M | Real Estate |
Frequently asked questions
What is Iron Mountain's diluted shares outstanding?
- Latest reported diluted shares outstanding for Iron Mountain (IRM) is 298.38M (period ending December 31, 2025).
How has Iron Mountain diluted shares outstanding changed year-over-year?
- Iron Mountain (IRM) diluted shares outstanding changed +0.5% year-over-year on the latest annual filing.
What is the long-term growth rate of Iron Mountain diluted shares outstanding?
- Iron Mountain (IRM) diluted shares outstanding compound annual growth rate is +0.6% over the most recent 5 years available.
When did Iron Mountain diluted shares outstanding hit its highest annual value?
- Iron Mountain diluted shares outstanding reached its highest annual value of 297.82M in 2025.
What was Iron Mountain diluted shares outstanding in 2024?
- Iron Mountain (IRM) diluted shares outstanding in 2024 was 296.23M.
What was Iron Mountain diluted shares outstanding in 2025?
- Iron Mountain (IRM) diluted shares outstanding in 2025 was 297.82M.
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