Quest Diagnostics Incorporated provides diagnostic testing, information, and services in the United States and internationally. The company develops and delivers diagnostic information services, such as routine testing, non-routine and advanced clinical testing, anatomic pathology testing, and other diagnostic information services.

Waters Corporation, a specialty measurement company, provides analytical workflow solutions in Asia, the Americas, and Europe. It operates through two segments, Waters and TA.

Universal Health Services, Inc., through its subsidiaries, owns and operates acute care hospitals, and outpatient and behavioral health care facilities. The company operates through Acute Care Hospital Services and Behavioral Health Care Services segments.

Humana Inc., together with its subsidiaries, operates as a health and well-being company in the United States. It operates through three segments: Retail, Group and Specialty, and Healthcare Services.

Hologic, Inc. develops, manufactures, and supplies diagnostics products, medical imaging systems, and surgical products for women's health through early detection and treatment in the United States, Europe, the Asia-Pacific, and internationally.