Top 20 Largest Publicly Traded Healthcare Companies

4. Merck 

Market Cap: $331.77 Billion 

More recently, Merck has made significant advancements in cancer treatment with its immunotherapy drug Keytruda (pembrolizumab). Keytruda was first approved by the FDA in 2014 for the treatment of melanoma and has since been approved for various other cancer types, including lung, bladder, head and neck, and Hodgkin lymphoma. Their total worldwide sales for Q4 2023 were $14.6 billion, an increase of 6% from Q4 2022. For the full year 2023, worldwide sales were $60.1 billion, an increase of 1% from 2022.