63/100BQuest Diagnostics company profile
- CEO
- James E. Davis
- Employees
- 57,000
- Headquarters
- 500 Plaza Drive, Secaucus, NJ 07094, US
- Sector
- Healthcare
- Industry
- Medical - Diagnostics & Research
- IPO date
- 17 Dec 1996
- Stock exchange
- NYSE
- ISIN
- US74834L1008
Website:questdiagnostics.com
About the company
Quest Diagnostics Incorporated, founded in 1967 and headquartered in Secaucus, New Jersey, is a premier provider of diagnostic testing, information, and related services, serving clients both domestically and internationally. Its core business involves the development and provision of diverse diagnostic information services, such as routine, advanced clinical, and anatomic pathology testing. While primarily operating under the Quest Diagnostics brand, it also leverages specialized identities like AmeriPath, Dermpath Diagnostics, ExamOne, and Quanum to reach a broad spectrum of clients. Its extensive client base includes patients, clinicians, hospitals, integrated delivery networks, health plans, employers, and other direct healthcare entities. Delivery of these services is facilitated through a robust network comprising laboratories, patient service centers, in-office phlebotomists, call centers, and mobile health professionals including paramedics and nurses. Additionally, the company provides risk assessment services for the life insurance industry and offers comprehensive information technology solutions to healthcare organizations and clinicians.
Employees
Quest Diagnostics had about 57,000 employees at the end of fiscal year 2025 (31 December 2025), by its annual report. That is 1.8% more than a year before.
Employees at each fiscal year end, as the company reports them in its annual report (10-K); revenue and net income per employee are the fiscal year's over that count.
Who owns Quest Diagnostics
Institutions such as funds, banks and insurers held 96.1% of Quest Diagnostics's shares on 30 June 2026, 1,128 of them reporting holdings to the SEC; the rest is held by individual investors and other shareholders.
Shares free to trade
Closely held shares belong to insiders, founders and owners of more than 5%, and seldom change hands. The free float is the rest: the shares anyone can buy and sell.
Common questions about Quest Diagnostics
Source: Financial Modeling Prep