MRK
Merck & Co., Inc. is a global pharmaceutical and animal health company that discovers, develops, and manufactures prescription medicines, biologic therapies, and vaccines for human diseases as well as veterinary products for livestock and companion animals. Merck's human pharmaceutical portfolio includes both therapeutic treatments and preventive vaccines across multiple disease areas, with its leading product being Keytruda (an immunotherapy), along with vaccines like Gardasil and treatments for diabetes and other conditions. The company operates two segments—Pharmaceutical (human health medicines and vaccines) and Animal Health (veterinary pharmaceuticals, vaccines, and health management solutions)—and sells primarily to wholesalers, retailers, hospitals, physicians, and government agencies.