SuperworthIron Mountain shares outstanding IRM
Diluted shares outstanding, averaged over each quarter, from 2009.
- Latest quarter, to Jun 30, 2026
- 299.8M
- On a year earlier
- +1.5%
- more shares
Iron Mountain had 299.8M diluted shares outstanding on average in Q2 FY26, the quarter to Jun 30, 2026.
That is 1.5% more than a year earlier, so each share owns a little less of the company.
Shares outstanding over time
Fiscal year by fiscal year
| Fiscal year | Shares, fourth quarter | Change |
|---|---|---|
| FY2025 | 298.4M | +0% |
| FY2024 | 297.2M | +1% |
| FY2023 | 295M | +1% |
| FY2022 | 292.9M | +0% |
| FY2021 | 291.8M | +1% |
| FY2020 | 289.2M | +0% |
| FY2019 | 288.1M | +0% |
| FY2018 | 287.1M | +6% |
| FY2017 | 271.4M | +3% |
| FY2016 | 264.4M | +25% |
| FY2015 | 212.2M | +3% |
| FY2014 | 205.4M | +7% |
| FY2013 | 192.7M | +6% |
| FY2012 | 181.9M | −0% |
| FY2011 | 182.6M | −9% |
Each fiscal year is the twelve months to its fourth quarter, shown as the fourth quarter's average share count.
Quarter by quarter
| Quarter | Ended | Shares outstanding | On a year earlier |
|---|---|---|---|
| Q2 FY26 | 299.8M | +2% | |
| Q1 FY26 | 298.8M | +1% | |
| Q4 FY25 | 298.4M | +0% | |
| Q3 FY25 | 298M | +1% | |
| Q2 FY25 | 295.4M | −0% | |
| Q1 FY25 | 297.3M | +1% | |
| Q4 FY24 | 297.2M | +1% | |
| Q3 FY24 | 293.6M | −0% | |
| Q2 FY24 | 295.8M | +1% | |
| Q1 FY24 | 295.2M | +1% | |
| Q4 FY23 | 295M | +1% | |
| Q3 FY23 | 294.3M | +1% |
What the shares outstanding tells you
Diluted shares outstanding, averaged over the period. Fewer shares means each one owns more of the company.
A falling count usually means buybacks. A rising one means stock pay, acquisitions paid in shares or new shares sold.
More on Iron Mountain
Valuation data, not investment advice. Prices as of . Reported figures come from the company's filings with the SEC.