Iron Mountain (IRM) - Market capitalization

Market cap: £18.69 Billion

As of December 2025 Iron Mountain has a market cap of £18.69 Billion. This makes Iron Mountain the world's 924th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.

Market cap history of Iron Mountain from 1997 to 2025

End of year Market Cap

Year	Marketcap	Change
2025	£18.69 B	-23.68%
2024	£24.48 B	52.68%
2023	£16.03 B	33.89%
2022	£11.97 B	6.71%
2021	£11.22 B	80.11%
2020	£6.23 B	-10.74%
2019	£6.98 B	-4.49%
2018	£7.31 B	-6.95%
2017	£7.85 B	13.3%
2016	£6.93 B	80.03%
2015	£3.85 B	-26.07%
2014	£5.21 B	47.92%
2013	£3.52 B	-3.51%
2012	£3.65 B	-0.76%
2011	£3.67 B	13.48%
2010	£3.24 B	13.22%
2009	£2.86 B	-15.87%
2008	£3.40 B	-8.29%
2007	£3.71 B	32.38%
2006	£2.80 B	-13.05%
2005	£3.22 B	56.35%
2004	£2.06 B	9%
2003	£1.89 B	8.03%
2002	£1.75 B	3.09%
2001	£1.69 B	23.17%
2000	£1.37 B	74.91%
1999	£0.78 B	113.47%
1998	£0.36 B	53.69%
1997	£0.24 B

End of Day market cap according to different sources

On Dec 9th, 2025 the market cap of Iron Mountain was reported to be:

£18.86 Billion

by Nasdaq

£18.86 Billion

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
Equifax EFX	£19.40 B	3.85%	🇺🇸 USA
Cintas CTAS	£56.05 B	199.92%	🇺🇸 USA
Automatic Data Processing ADP	£78.71 B	321.16%	🇺🇸 USA
Pitney Bowes PBI	£1.28 B	-93.11%	🇺🇸 USA
Dun & Bradstreet DNB	£3.06 B	-83.62%	🇺🇸 USA
Fiserv FI	£25.72 B	37.66%	🇺🇸 USA
Tradeweb TW	£17.52 B	-6.22%	🇺🇸 USA
Moody's MCO	£64.59 B	245.63%	🇺🇸 USA

What is the market capitalization of a company?

The market capitalization sometimes referred as Marketcap, is the value of a publicly listed company.
In most cases it can be easily calculated by multiplying the share price with the amount of outstanding shares.

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Market capitalization of Iron Mountain (IRM)

Market cap: £18.69 Billion