Quest Diagnostics market cap DGX

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

Quest Diagnostics is worth $26.7B at the close on Oct 23, 2026, at $241.89 a share.

That is up 32% over the last year and up 48% over five years.

Its highest close in our data was $27.2B in Sep 2026.

Market cap over time

Year	End of year	Low	High	Change
2026 so far	$26.7B	$19.3B	$27.2B	+36%
2025	$19.6B	$16.9B	$21.3B	+15%
2024	$17B	$13.8B	$18.3B	+10%
2023	$15.5B	$13.7B	$17.7B	−13%
2022	$17.8B	$14.3B	$19.1B	−16%
2021	$21.2B	$15.4B	$21.2B	+32%
2020	$16.1B	$9.8B	$17.1B	+12%
2019	$14.4B	$11.3B	$14.5B	+29%
2018	$11.2B	$11.1B	$15.6B	−17%
2017	$13.4B	$12.4B	$15.2B	+5%
2016	$12.7B	$8.9B	$12.8B	+25%
2015	$10.2B	$9B	$11.4B	+4%
2014	$9.8B	$7.4B	$9.8B	+25%
2013	$7.9B	$7.8B	$9.9B	−14%
2012	$9.2B	$8.7B	$10.2B	+0%
2011	$9.2B	$7.4B	$10B	−0%
2010	$9.2B	$7.9B	$11.1B	−18%
2009	$11.2B	$9.5B	$11.4B	n/a

Companies in Medical - Diagnostics & Research nearest Quest Diagnostics' size, closest first, today.

Company	Market cap
DGXQuest Diagnostics	$26.7B
LHLabcorp	$26.7B
MTDMettler-Toledo International	$33.5B
MEDPMedpace	$18.7B
RVTYRevvity	$17.7B
ILMNIllumina	$40.7B
IDXXIDEXX Laboratories	$44.1B
WATWaters	$44.6B
IQVIQVIA	$46B
AAgilent Technologies	$48.8B
BIOBio-Rad Laboratories	$9.9B
Peer median	$37.1B