Ionis Pharmaceuticals, Inc. engages in the development and commercialization of human therapeutic drugs using antisense technology. It operates through the Ionis Core segment. The Ionis Core segment exploits a novel drug discovery platform to generate a pipeline of drugs. The company was founded by Stanley T. Crooke, David J. Ecker, Christopher K. Mirabelli, and Brett P. Monia on January 10, 1989 and is headquartered in Carlsbad, CA.