IRM
Iron Mountain Incorporated (Delaware)Common Stock REITStock · Real EstateUS REITs 2.0% · S&P 500 Equal Weight 0.2% · S&P 500 0.06% · Russell 1000 0.05% · Russell 3000 0.05% · US Stock Market 0.05% · MSCI World 0.04% · MSCI ACWI 0.04%$115.18+2.02%
as of market close, Sep 11, 2026
☾ AH — —
Iron Mountain Incorporated (Delaware)Common Stock REIT monthly returns
Iron Mountain Incorporated (Delaware)Common Stock REIT has averaged 1.47% per month, positive in 55% of months. Month-by-month returns for Iron Mountain Incorporated (Delaware)Common Stock REIT (IRM) below, through September 11, 2026 — the table lists the most recent months; the bar chart plots the last 5 years.
Average month
+1.5%
357 months
Best month
+33.5%
Dec 1999
Worst month
-25.0%
Jun 2013
Positive months
55%
of all months
Iron Mountain Incorporated (Delaware)Common Stock REIT monthly returns#
| Month | Path | Total return |
|---|---|---|
| Sep 2026 | -0.1% | |
| Aug 2026 | -5.7% | |
| Jul 2026 | -3.6% | |
| Jun 2026 | -0.4% | |
| May 2026 | +1.8% | |
| Apr 2026 | +23.4% | |
| Mar 2026 | -4.9% | |
| Feb 2026 | +17.6% | |
| Jan 2026 | +11.1% | |
| Dec 2025 | -2.9% | |
| Nov 2025 | -16.1% | |
| Oct 2025 | +1.0% | |
| Sep 2025 | +11.3% | |
| Aug 2025 | -5.2% | |
| Jul 2025 | -5.1% | |
| Jun 2025 | +4.7% | |
| May 2025 | +10.1% | |
| Apr 2025 | +4.2% | |
| Mar 2025 | -6.8% | |
| Feb 2025 | -8.3% | |
| Jan 2025 | -3.4% | |
| Dec 2024 | -14.5% | |
| Nov 2024 | -0.0% | |
| Oct 2024 | +4.1% | |
| Sep 2024 | +5.6% | |
| Aug 2024 | +10.4% | |
| Jul 2024 | +14.4% | |
| Jun 2024 | +11.9% | |
| May 2024 | +4.1% | |
| Apr 2024 | -3.4% | |
| Mar 2024 | +2.8% | |
| Feb 2024 | +16.5% | |
| Jan 2024 | -3.5% | |
| Dec 2023 | +10.1% | |
| Nov 2023 | +8.6% | |
| Oct 2023 | -0.6% | |
| Sep 2023 | -5.5% | |
| Aug 2023 | +3.5% | |
| Jul 2023 | +8.1% | |
| Jun 2023 | +7.5% | |
| May 2023 | -3.3% | |
| Apr 2023 | +4.4% | |
| Mar 2023 | +1.5% | |
| Feb 2023 | -3.4% | |
| Jan 2023 | +9.5% | |
| Dec 2022 | -7.2% | |
| Nov 2022 | +8.5% | |
| Oct 2022 | +13.9% | |
| Sep 2022 | -15.5% | |
| Aug 2022 | +8.5% | |
| Jul 2022 | -0.4% | |
| Jun 2022 | -8.5% | |
| May 2022 | +0.3% | |
| Apr 2022 | -3.0% | |
| Mar 2022 | +14.1% | |
| Feb 2022 | +7.1% | |
| Jan 2022 | -12.2% | |
| Dec 2021 | +16.6% | |
| Nov 2021 | -0.4% | |
| Oct 2021 | +5.0% | |
| Sep 2021 | -7.8% | |
| Aug 2021 | +9.1% | |
| Jul 2021 | +3.4% | |
| Jun 2021 | -1.5% | |
| May 2021 | +8.5% | |
| Apr 2021 | +8.4% | |
| Mar 2021 | +8.2% | |
| Feb 2021 | +3.3% | |
| Jan 2021 | +14.2% | |
| Dec 2020 | +9.4% | |
| Nov 2020 | +5.5% | |
| Oct 2020 | -2.7% | |
| Sep 2020 | -9.1% | |
| Aug 2020 | +6.7% | |
| Jul 2020 | +8.0% | |
| Jun 2020 | +3.6% | |
| May 2020 | +6.5% | |
| Apr 2020 | +1.6% | |
| Mar 2020 | -19.9% | |
| Feb 2020 | -3.8% | |
| Jan 2020 | -0.8% | |
| Dec 2019 | +1.1% | |
| Nov 2019 | -2.1% | |
| Oct 2019 | +1.3% | |
| Sep 2019 | +3.5% | |
| Aug 2019 | +8.3% | |
| Jul 2019 | -6.0% | |
| Jun 2019 | +4.1% | |
| May 2019 | -5.6% | |
| Apr 2019 | -8.4% | |
| Mar 2019 | +1.9% | |
| Feb 2019 | -4.8% | |
| Jan 2019 | +14.8% | |
| Dec 2018 | -2.9% | |
| Nov 2018 | +11.0% | |
| Oct 2018 | -11.3% | |
| Sep 2018 | -2.8% | |
| Aug 2018 | +2.8% | |
| Jul 2018 | +0.3% | |
| Jun 2018 | +7.0% | |
| May 2018 | -1.9% | |
| Apr 2018 | +3.3% | |
| Mar 2018 | +6.3% | |
| Feb 2018 | -10.2% | |
| Jan 2018 | -7.2% | |
| Dec 2017 | -6.2% | |
| Nov 2017 | +2.2% | |
| Oct 2017 | +2.8% | |
| Sep 2017 | +0.1% | |
| Aug 2017 | +8.2% | |
| Jul 2017 | +6.0% | |
| Jun 2017 | -0.0% | |
| May 2017 | +0.5% | |
| Apr 2017 | -2.6% | |
| Mar 2017 | -0.3% | |
| Feb 2017 | +1.5% | |
| Jan 2017 | +10.2% | |
| Dec 2016 | +0.0% | |
| Nov 2016 | -2.2% | |
| Oct 2016 | -10.1% |
Monthly total return (since Oct 2021)#
-20%-10%0%10%20%
Oct 2021+5.0%
Nov 2021-0.44%
Dec 2021+17%
Jan 2022-12%2022
Feb 2022+7.1%
Mar 2022+14%
Apr 2022-3.0%
May 2022+0.32%
Jun 2022-8.5%
Jul 2022-0.41%
Aug 2022+8.5%
Sep 2022-15%
Oct 2022+14%
Nov 2022+8.5%
Dec 2022-7.2%
Jan 2023+9.5%2023
Feb 2023-3.4%
Mar 2023+1.5%
Apr 2023+4.4%
May 2023-3.3%
Jun 2023+7.5%
Jul 2023+8.1%
Aug 2023+3.5%
Sep 2023-5.5%
Oct 2023-0.64%
Nov 2023+8.6%
Dec 2023+10%
Jan 2024-3.5%2024
Feb 2024+16%
Mar 2024+2.8%
Apr 2024-3.4%
May 2024+4.1%
Jun 2024+12%
Jul 2024+14%
Aug 2024+10%
Sep 2024+5.6%
Oct 2024+4.1%
Nov 2024-0.05%
Dec 2024-14%
Jan 2025-3.4%2025
Feb 2025-8.3%
Mar 2025-6.8%
Apr 2025+4.2%
May 2025+10%
Jun 2025+4.7%
Jul 2025-5.1%
Aug 2025-5.2%
Sep 2025+11%
Oct 2025+0.99%
Nov 2025-16%
Dec 2025-2.9%
Jan 2026+11%2026
Feb 2026+18%
Mar 2026-4.9%
Apr 2026+23%
May 2026+1.8%
Jun 2026-0.42%
Jul 2026-3.6%
Aug 2026-5.7%
Sep 2026-0.15%
Methodology#
Monthly returns are total returns (dividends reinvested), computed from IRM's split- and dividend-adjusted month-end closes. The table shows the most recent 120 months and the bar chart the most recent 60. See the year-by-year returns for the annual view. Past performance does not predict future returns; not investment advice.
FAQ#
- What is Iron Mountain Incorporated (Delaware)Common Stock REIT's average monthly return?
- Iron Mountain Incorporated (Delaware)Common Stock REIT (IRM) has averaged about 1.47% per month, positive in roughly 55% of months. The best month was Dec 1999 (+33.5%) and the worst was Jun 2013 (-25.0%).
More on Iron Mountain Incorporated (Delaware)Common Stock REIT
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