Rahway, New Jersey-based Merck & Co., Inc. (MRK) is an international healthcare company that offers human health pharmaceuticals across various areas, including Keytruda, Keytruda Qlex, Welireg, Gardasil, ProQuad, M-M-R II, Varivax, Vaxneuvance, and other brands. Valued at a market cap of $277 billion, the company also provides veterinary pharmaceuticals, vaccines and health management solutions and services. Shares of the company have outperformed the broader market over the past year and in 2026. MRK s ...