Iron Mountain (IRM)
S&P 500 · Real Estate · data since 1996-02-01 · last close 2026-09-09
Iron Mountain (IRM) monthly returns (%)
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 11.1 | 17.6 | -5.0 | 23.4 | 1.8 | -0.8 | -3.2 | -5.7 | -0.1 | · | · | · |
| 2025 | -3.4 | -8.3 | -6.8 | 4.2 | 10.1 | 4.7 | -5.1 | -5.2 | 11.3 | 1.0 | -16.1 | -2.9 |
| 2024 | -3.5 | 16.5 | 2.8 | -3.4 | 4.1 | 11.9 | 14.4 | 10.4 | 5.6 | 4.1 | -0.1 | -14.5 |
| 2023 | 9.5 | -3.4 | 1.5 | 4.4 | -3.3 | 7.5 | 8.1 | 3.5 | -5.5 | -0.6 | 8.6 | 10.1 |
| 2022 | -12.3 | 7.1 | 14.1 | -3.0 | 0.3 | -8.5 | -0.4 | 8.5 | -15.5 | 13.9 | 8.5 | -7.2 |
| 2021 | 14.2 | 3.3 | 8.2 | 8.4 | 8.5 | -1.5 | 3.4 | 9.1 | -7.8 | 5.0 | -0.4 | 16.6 |
| 2020 | -0.8 | -3.8 | -19.9 | 1.6 | 6.5 | 3.6 | 8.0 | 6.7 | -9.1 | -2.7 | 5.5 | 9.4 |
| 2019 | 14.8 | -4.8 | 1.9 | -8.4 | -5.6 | 4.1 | -6.0 | 8.3 | 3.5 | 1.3 | -2.1 | 1.1 |
| 2018 | -7.2 | -10.2 | 6.3 | 3.3 | -1.9 | 7.0 | 0.3 | 2.8 | -2.8 | -11.3 | 11.0 | -2.9 |
| 2017 | 10.2 | 1.5 | -0.3 | -2.5 | 0.5 | 0.0 | 6.0 | 8.2 | 0.1 | 2.8 | 2.2 | -6.3 |
| 2016 | 2.0 | 6.7 | 17.3 | 7.7 | 0.6 | 9.9 | 3.5 | -6.8 | -1.1 | -10.1 | -2.2 | 0.0 |
| 2015 | 3.0 | -7.8 | 0.5 | -5.5 | 5.7 | -13.7 | -3.1 | -5.7 | 11.3 | -1.2 | -7.8 | -2.8 |
| 2014 | -13.0 | 3.0 | 2.4 | 3.2 | 9.5 | 14.9 | -5.5 | 7.4 | 1.6 | 10.5 | 6.1 | 3.0 |
| 2013 | 10.2 | 0.8 | 6.0 | 4.3 | -5.3 | -25.0 | 4.5 | -7.2 | 5.7 | -1.8 | 6.0 | 8.9 |
| 2012 | 0.1 | 0.8 | -6.5 | 5.5 | -6.7 | 17.2 | -2.3 | 1.8 | 4.8 | 13.7 | -8.7 | -0.9 |
| 2011 | -2.5 | 6.6 | 20.9 | 2.0 | 6.8 | 1.0 | -7.2 | 2.9 | -2.1 | -2.2 | -1.8 | 2.2 |
| 2010 | 0.4 | 13.2 | 6.1 | -8.2 | -2.5 | -8.2 | 5.4 | -14.3 | 10.5 | -2.5 | 1.9 | 13.5 |
| 2009 | -17.3 | -9.2 | 19.3 | 28.5 | -4.3 | 5.5 | 1.6 | 0.3 | -9.0 | -8.4 | -1.8 | -5.2 |
| 2008 | -7.1 | -12.5 | -12.1 | 3.9 | 9.3 | -11.6 | 9.2 | -0.3 | -15.6 | -0.5 | -10.5 | 13.8 |
| 2007 | 1.5 | -0.6 | -6.1 | 7.5 | -2.2 | -5.0 | 2.5 | 5.5 | 7.9 | 13.9 | 5.0 | 1.5 |
| 2006 | -1.3 | 4.8 | -6.8 | -4.0 | -5.5 | 1.2 | 9.7 | -0.0 | 4.8 | 1.0 | -0.6 | -4.1 |
| 2005 | -7.5 | -4.1 | 6.6 | 3.0 | -3.4 | 8.1 | 10.5 | 0.6 | 6.4 | 6.3 | 5.8 | 2.4 |
| 2004 | 5.3 | 7.7 | -0.5 | 2.0 | -2.7 | 9.0 | 0.3 | -4.5 | 9.8 | -2.4 | -8.8 | 1.2 |
| 2003 | -3.9 | 11.0 | 8.7 | 4.2 | -0.9 | -6.1 | -1.3 | 1.1 | -3.0 | 6.5 | -3.8 | 7.5 |
| 2002 | 9.8 | -0.3 | -0.8 | -2.9 | 0.7 | -0.5 | -3.6 | -6.5 | -10.1 | 12.9 | 17.3 | -0.2 |
| 2001 | 0.2 | 4.9 | -1.8 | -5.7 | 13.7 | 9.1 | -2.7 | -2.3 | -2.8 | -5.8 | 10.9 | 1.1 |
| 2000 | -16.1 | -7.6 | 11.7 | 2.9 | 4.1 | -7.1 | 3.2 | -2.5 | 8.4 | -8.6 | -1.9 | 11.9 |
| 1999 | -10.2 | -5.4 | 2.0 | -11.0 | -0.7 | 3.6 | 12.4 | -2.1 | 7.5 | -11.4 | -1.9 | 33.5 |
| 1998 | -0.7 | -4.9 | 10.3 | 12.0 | -1.1 | 7.8 | -5.0 | -17.1 | 27.7 | 1.9 | -4.3 | 23.3 |
| 1997 | -6.6 | -0.9 | -11.6 | -5.0 | 18.6 | 7.6 | 7.5 | -2.3 | 11.1 | 9.8 | -1.1 | -5.3 |
| 1996 | · | -1.6 | -3.9 | 9.8 | 11.9 | 12.0 | 10.7 | 4.3 | 21.6 | 1.7 | 2.1 | -1.2 |
| Avg | -0.7 | 0.7 | 2.1 | 2.6 | 2.1 | 1.9 | 2.5 | -0.0 | 2.4 | 1.2 | 0.6 | 3.6 |
Values in %. Current and first-listed months are partial (greyed).
returnsview.com
IRM seasonality — average by calendar month
Iron Mountain has monthly history back to 1996. December carries the highest average at +3.6%, but the median December is +1.2% and 18 of 30 have finished green: +34% in 1999 does most of the lifting. The steadier month is September — positive in 18 of 30 years, median +4.2%. January is the soft spot, down in 16 of 30 with a median of -0.8%. Across its full record it has closed 55% of months higher, swings ±8.2% in an average month and has fallen 55.7% peak to trough.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg | -0.7% | +0.7% | +2.1% | +2.6% | +2.1% | +1.9% | +2.5% | -0.0% | +2.5% | +1.2% | +0.6% | +3.6% |
| Win rate | 47%/30 | 48%/31 | 58%/31 | 65%/31 | 55%/31 | 61%/31 | 61%/31 | 52%/31 | 60%/30 | 53%/30 | 43%/30 | 60%/30 |
Win rate = share of positive months / sample size.
IRM risk & extremes
IRM drawdown & rolling returns
Percent below the all-time high at each month-end — how far underwater the asset was.
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Frequently asked questions
What was Iron Mountain's best month?+
Iron Mountain's strongest completed month on record is December 1999, at +33.55%.
What was Iron Mountain's worst month?+
Its weakest completed month on record is June 2013, at -25.02%.
Is Iron Mountain up this year?+
Iron Mountain is up 40.99% year to date, measured from its last close before 1 January.
What is Iron Mountain's 1-year return?+
+23.25% over the past twelve months, comparing the latest close with the most recent close on or before the same date a year earlier.
What is Iron Mountain's biggest drawdown?+
The deepest peak-to-trough fall on record is 55.7%, measured on month-end closes since 1996.
Which calendar month is historically best for Iron Mountain?+
December has the highest average return across every completed December since 1996. An average is not a forecast.
About Iron Mountain
Iron Mountain is an S&P 500 company, a real estate business worth about $34 billion. It proves location, location, location scales nicely — with price receipts on this site going back to 1996. And the long game: $100 at its first close here (1996) would be about $10,167 today.
Did you know?
- Its best month on record was December 1999 at +33.55%; its worst, June 2013 at -25.02%.
Trivia for entertainment — the numbers come from our price data; the jokes don't.