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Secaucus, New Jersey-based Quest Diagnostics Incorporated (DGX) provides diagnostic testing and services in the United States and internationally. Valued at a market capitalization of $23 billion, the company develops and delivers diagnostic information services, including routine, non-routine, and advanced clinical testing, anatomic pathology testing, and other diagnostic services.
The company's shares have outperformed the broader market over the past year and in 2026. DGX stock has surged 21.8% over the past 52 weeks and 18.4% on a YTD basis. In comparison, the S&P 500 Index ($SPX) has returned 11.9% over the past year and declined marginally in 2026.