Iron Mountain market cap IRM

Share price times shares outstanding: what the whole company sells for, since 2010.

Iron Mountain is worth $32.7B at the close on Oct 23, 2026, at $109.96 a share.

That is up 5% over the last year and up 148% over five years.

Its highest close in our data was $39.4B in Jun 2026.

Market cap over time

Year	End of year	Low	High	Change
2026 so far	$32.7B	$24.6B	$39.4B	+35%
2025	$24.2B	$22.7B	$32.6B	−21%
2024	$30.7B	$19.5B	$37.5B	+50%
2023	$20.4B	$14.6B	$20.4B	+41%
2022	$14.5B	$12.5B	$16.4B	−4%
2021	$15.2B	$8.2B	$15.2B	+78%
2020	$8.5B	$6.3B	$9.9B	−7%
2019	$9.1B	$8.6B	$10.5B	−1%
2018	$9.3B	$8.7B	$10.5B	−8%
2017	$10.1B	$8.8B	$11.1B	+18%
2016	$8.6B	$5.2B	$10.2B	+50%
2015	$5.7B	$5.6B	$8.1B	−26%
2014	$7.7B	$5B	$7.7B	+32%
2013	$5.8B	$4.8B	$7.5B	+10%
2012	$5.3B	$4.7B	$6B	−7%
2011	$5.7B	$4.9B	$7.1B	+14%
2010	$5B	$4.1B	$5.1B	n/a

Companies in REIT - Specialty nearest Iron Mountain's size, closest first, today.

Company	Market cap
IRMIron Mountain	$32.7B
CCICrown Castle	$36.6B
VMRKVivmark Residential	$47.3B
SBACSBA Communications	$19.6B
HSTHost Hotels & Resorts	$16.9B
DLRDigital Realty Trust	$63.8B
KIMKimco Realty	$15.8B
LAMRLamar Advertising	$15.7B
WPCW. P. Carey	$14.6B
WYWeyerhaeuser	$14B
OHIOmega Healthcare Investors	$14B
Peer median	$16.4B