NYSE: MRK Merck & Co. stock price chart

Merck & Co., Inc. (NYSE: MRK) Merck Sharp & Dohme (MSD) outside the United States and Canada. An American multinational pharmaceutical company and one of the largest pharmaceutical companies in the world. In 1887 a German-born, long-time Merck employee, Theodore Weicker, went to the United States and started the American Merck & Co, with headquarters in lower Manhattan. Products: Gardasil, Singulair, Propecia/Proscar, Zocor Vioxx Fosamax Keytruda Januvia Primaxin, ect. DJIA component, S&P 100 component, S&P 500 component. Headquartered in Kenilworth, New Jersey, United States.