Sema4 Holdings Corp., doing business as Sema4, operates as a health information company that enhances diagnosis, treatment, and prevention of disease through data. The company provides Centrellis, an AI-driven health intelligence platform that delivers comprehensive insights to biopharma to accelerate the drug discovery, development, and commercialization life-cycle, as well as analytics for actionable insights, pre-clinical and clinical trial support, and advanced sequencing services. It also offers Sema4 Signal that enables and advances precision oncology care, from prevention to treatment to remission; and testing for carrier screening, noninvasive prenatal testing, and newborn screening, as well as hereditary cancer testing. In addition, the company provides COVID-19 testing solutions for governmental organizations, K-12 schools, higher education institutions, large businesses, and healthcare providers, as well as residents in Connecticut. Sema4 Holdings Corp. is headquartered in Stamford, Connecticut.