With a market cap of $289 billion, UnitedHealth Group Incorporated (UNH) is a diversified health care company operating globally through four main segments: UnitedHealthcare, Optum Health, Optum Insight, and Optum Rx. Its businesses provide health benefit plans, care delivery, data and technology services, and pharmacy care solutions to individuals, employers, government programs, and health systems. Companies valued at $200 billion or more are generally classified as “mega-cap” stocks, and UnitedHealth G ...