Seasonality
IRM seasonality — Iron Mountain
Over the last 11 years, IRM's strongest month on average has been August (+4.7%) and its weakest September (-3.5%).
Average return by month
Month-by-month statistics
| Month | Avg | Median | Up % | Best | Worst | Yrs |
|---|---|---|---|---|---|---|
| Jan | +3.27% | +4.34% | 50% | +14.8% | -12.2% | 10 |
| Feb | +1.56% | -0.91% | 50% | +17.6% | -10.2% | 10 |
| Mar | -1.11% | +0.21% | 60% | +12.7% | -21.7% | 10 |
| Apr | +2.79% | +2.44% | 60% | +23.4% | -8.4% | 10 |
| May | +2.10% | +1.13% | 70% | +10.1% | -5.6% | 10 |
| Jun | +1.44% | +1.72% | 60% | +11.1% | -9.7% | 10 |
| Jul | +2.55% | +1.84% | 60% | +14.4% | -6.0% | 10 |
| Aug | +4.67% | +7.47% | 80% | +10.4% | -5.7% | 10 |
| Sep | -3.53% | -4.10% | 30% | +10.4% | -16.4% | 10 |
| Oct | +1.85% | +2.05% | 70% | +13.9% | -11.3% | 10 |
| Nov | +1.90% | +2.17% | 56% | +11.0% | -16.1% | 9 |
| Dec | -1.04% | -2.76% | 30% | +15.2% | -15.0% | 10 |
Monthly returns heat map — IRM
price return, %| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 11.1 | 17.6 | -5.7 | 23.4 | 1.8 | -1.5 | -3.2 | -5.7 | -3.8 | 5.0 | -8.6 | +28.4% | |
| 2025 | -3.4 | -8.3 | -7.7 | 4.2 | 10.1 | 3.9 | -5.1 | -5.2 | 10.4 | 1.0 | -16.1 | -3.9 | -21.1% |
| 2024 | -3.5 | 16.5 | 2.0 | -3.4 | 4.1 | 11.1 | 14.4 | 10.4 | 4.9 | 4.1 | -0.1 | -15.0 | +50.2% |
| 2023 | 9.5 | -3.4 | 0.3 | 4.4 | -3.3 | 6.4 | 8.1 | 3.5 | -6.4 | -0.6 | 8.6 | 9.1 | +40.4% |
| 2022 | -12.2 | 7.1 | 12.7 | -3.0 | 0.3 | -9.7 | -0.4 | 8.5 | -16.4 | 13.9 | 8.5 | -8.2 | -4.7% |
| 2021 | 14.2 | 3.3 | 6.4 | 8.4 | 8.5 | -2.8 | 3.4 | 9.1 | -9.0 | 5.0 | -0.4 | 15.2 | +77.5% |
| 2020 | -0.8 | -3.8 | -21.7 | 1.6 | 6.5 | 1.3 | 8.0 | 6.7 | -11.0 | -2.7 | 5.5 | 7.2 | -7.5% |
| 2019 | 14.8 | -4.8 | 0.1 | -8.4 | -5.6 | 2.1 | -6.0 | 8.3 | 1.7 | 1.3 | -2.1 | -0.8 | -1.7% |
| 2018 | -7.2 | -10.2 | 4.5 | 3.3 | -1.9 | 5.2 | 0.3 | 2.8 | -4.4 | -11.3 | 11.0 | -4.6 | -14.1% |
| 2017 | 10.2 | 1.5 | -1.9 | -2.5 | 0.5 | -1.6 | 6.0 | 8.2 | -1.3 | 2.8 | 2.2 | -7.7 | +16.2% |
| 2016 | -1.6 |