Merck & Co., Inc. (MRK)
Merck & Co., Inc. operates as a healthcare company worldwide. It operates through two segments, Pharmaceutical and Animal Health.
Novartis AG (NVS)
Novartis AG engages in the research, development, manufacture, and marketing of healthcare products in Switzerland and internationally.
Pfizer Inc. (PFE)
Pfizer Inc. discovers, develops, manufactures, markets, distributes, and sells biopharmaceutical products in the United States, Europe, and internationally.