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Quest Diagnostics Incorporated (DGX) is a healthcare company in the medical testing laboratories industry, based in Secaucus, United States, with about 46,000 full-time employees.
It reported revenue of $11.04 billion for fiscal year 2025, and net income of $988.00 million. In Q2 2026 (the quarter ended June 30, 2026) revenue was $3.04 billion. Its largest business segment, Diagnostic Information Services Business, brought in 98% of segment revenue in fiscal year 2025. Its market capitalization was $25.49 billion as of October 9, 2026.
Figures from company filings and market data; latest fiscal year ended December 31, 2025; market data as of October 9, 2026.
Quest Diagnostics Incorporated provides diagnostic testing and services in the United States. The company develops and delivers diagnostic information services, such as routine, non-routine and advanced clinical testing, anatomic pathology testing, and other diagnostic information services.
Quest Diagnostics reported $11.04 billion in revenue for fiscal year 2025. In Q2 2026 revenue was $3.04 billion.
Diagnostic Information Services Business, with $10.79 billion or 98% of segment revenue in fiscal year 2025. Next: DS Revenues (2%).
$25.49 billion as of October 9, 2026.
Listed companies of a similar size in the same industry (medical testing laboratories) include Labcorp Holdings Inc. (LH), NeoGenomics, Inc. (NEO), GeneDx Holdings Corp. (WGS), Opko Health, Inc. (OPK).