Quest Diagnostics (DGX) - Market capitalization

Market cap: $19.43 Billion USD

As of January 2026 Quest Diagnostics has a market cap of $19.43 Billion USD. This makes Quest Diagnostics the world's 1153th 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 Quest Diagnostics from 1997 to 2025

End of year Market Cap

Year	Marketcap	Change
2025	$19.67 B	15.49%
2024	$17.03 B	9.89%
2023	$15.50 B	-12.99%
2022	$17.81 B	-16.05%
2021	$21.22 B	32.15%
2020	$16.06 B	13.07%
2019	$14.20 B	26.35%
2018	$11.24 B	-16.26%
2017	$13.42 B	5.36%
2016	$12.74 B	25.24%
2015	$10.17 B	5.35%
2014	$9.65 B	25.25%
2013	$7.70 B	-16.43%
2012	$9.22 B	0.73%
2011	$9.15 B	-0.59%
2010	$9.21 B	-16.75%
2009	$11.06 B	8.99%
2008	$10.15 B	-1.13%
2007	$10.27 B	-0.09%
2006	$10.27 B	0.62%
2005	$10.21 B	5.66%
2004	$9.66 B	28.64%
2003	$7.51 B	34.85%
2002	$5.57 B	-19.05%
2001	$6.88 B	4.19%
2000	$6.60 B	389.88%
1999	$1.34 B	152.18%
1998	$0.53 B	5.71%
1997	$0.50 B
2026	$19.43 B	-1.22%

End of Day market cap according to different sources

On Jan 2nd, 2026 the market cap of Quest Diagnostics was reported to be:

$19.32 Billion USD

by Nasdaq

$19.43 Billion USD

by CompaniesMarketCap

Market capitalization for similar companies or competitors

Name	Marketcap	Market cap differencediff.	Country
LabCorp LH	$20.91 B	7.61%	🇺🇸 USA
Psychemedics PMD	$15.73 M	-99.92%	🇺🇸 USA
NeoGenomics NEO	$1.52 B	-92.17%	🇺🇸 USA
Enzo Biochem ENZB	$36.58 M	-99.81%	🇺🇸 USA
Translate Bio TBIO.defunct	$2.82 B	-85.47%	🇺🇸 USA
Qiagen QGEN	$9.79 B	-49.58%	🇳🇱 Netherlands

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 Quest Diagnostics (DGX)

Market cap: $19.43 Billion USD