Costar market cap CSGP

Share price times shares outstanding: what the whole company sells for, since 2011.

Costar is worth $13.7B at the close on Oct 23, 2026, at $33.92 a share.

That is down 58% over the last year and down 60% over five years.

Its highest close in our data was $40.1B in Aug 2025.

Market cap over time

Year	End of year	Low	High	Change
2026 so far	$13.7B	$11.1B	$27.8B	−52%
2025	$28.4B	$27.6B	$40.1B	−4%
2024	$29.6B	$29.2B	$39.5B	−17%
2023	$35.7B	$27.2B	$37B	+14%
2022	$31.4B	$21.9B	$33.9B	+1%
2021	$31.2B	$30.6B	$39.2B	−14%
2020	$36.4B	$19.3B	$36.4B	+66%
2019	$21.9B	$12.3B	$23.2B	+79%
2018	$12.3B	$11.3B	$16.1B	+14%
2017	$10.7B	$6.3B	$11.2B	+75%
2016	$6.1B	$5.1B	$7.2B	−9%
2015	$6.7B	$5.6B	$7B	+10%
2014	$6.1B	$4.1B	$6.1B	+15%
2013	$5.3B	$2.5B	$5.4B	+114%
2012	$2.5B	$1.5B	$2.5B	+46%
2011	$1.7B	$1.2B	$1.7B	n/a

Companies in Financial - Credit Services nearest Costar's size, closest first, today.