American Tower market cap AMT

Share price times shares outstanding: what the whole company sells for, since 2009.

American Tower is worth $88.1B at the close on Oct 23, 2026, at $188.97 a share.

That is down 2% over the last year and down 31% over five years.

Its highest close in our data was $137.5B in Sep 2021.

Market cap over time

Year	End of year	Low	High	Change
2026 so far	$88.1B	$75.6B	$90.4B	+7%
2025	$82.6B	$80.7B	$107.6B	−3%
2024	$85B	$79.9B	$111.4B	−16%
2023	$100.6B	$74.4B	$108.4B	+2%
2022	$98.6B	$86.5B	$129.3B	−26%
2021	$133.2B	$88.9B	$137.5B	+34%
2020	$99.7B	$86.5B	$117.7B	−2%
2019	$101.5B	$69.7B	$103B	+45%
2018	$70B	$57B	$73.4B	+14%
2017	$61.2B	$44B	$64.6B	+36%
2016	$45B	$36.3B	$50B	+10%
2015	$41.1B	$37.4B	$43.3B	+3%
2014	$39.9B	$31.4B	$41.6B	+28%
2013	$31.1B	$27.1B	$33.4B	+4%
2012	$30B	$23.7B	$30.4B	+27%
2011	$23.6B	$19.3B	$23.8B	+14%
2010	$20.6B	$15.7B	$20.9B	+19%
2009	$17.3B	$12.7B	$17.4B	n/a

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