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Quest Diagnostics DGX

HealthcareMarket cap $26B3 connections

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Customers 2

Companies Quest Diagnostics sells to

AmazonConsumer & Retail · $2.7TAmazon lab testing
UnitedHealthHealthcare · $338BLab benefit management

Competitors 1

Companies it competes with

Laboratory CorpHealthcare · $25BClinical lab rivalry

Other Healthcare companies

Eli Lilly Johnson & Johnson AbbVie Novo Nordisk Merck UnitedHealth Thermo Fisher AstraZeneca Amgen Novartis

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Relationships are compiled by VexMap from company filings, announcements and reporting, and last reviewed September 2026. Spotted something wrong? Tell us. Not investment advice.