UnitedHealth Group, Johnson & Johnson, and HCA Healthcare are the three Healthcare stocks to watch today, according to MarketBeat’s stock screener tool. Healthcare stocks are shares in publicly traded companies that operate within the healthcare sector—pharmaceutical and biotechnology firms, medical device makers, hospitals and clinics, health insurers, and healthcare technology providers. These companies had the highest dollar trading volume of any Healthcare stocks within the last several days. The company operates through four segments: UnitedHealthcare, Optum Health, Optum Insight, and Optum Rx. Johnson & Johnson (JNJ)Johnson & Johnson is a holding company, which engages in the research, development, manufacture, and sale of products in the healthcare field.