Seres Therapeutics is a late-clinical-stage biotechnology company with a strong development pipeline and rigorous scientific underpinning, working to revolutionize treatment of a wide range of diseases by modulating the function of the human microbiome.

We are led by an exceptional team of drug development and microbiome experts within our management team, Board of Directors, and Scientific Advisory Board. Our leaders have vast experience in the discovery, development, regulatory approval and successful commercialization of a wide range of therapeutic products.

Seres’ SER-109 program achieved the first-ever positive pivotal clinical results for a targeted microbiome drug candidate and has obtained Breakthrough Therapy and Orphan Drug designations from the FDA. The SER-109 program is being advanced for the treatment of recurrent C. difficile infection and has potential to become a first-in-class FDA-approved microbiome therapeutic. Seres’ SER-287 program has obtained Fast Track and Orphan Drug designations from the FDA and is being evaluated in a Phase 2b study in patients with active mild-to-moderate ulcerative colitis. Seres is developing SER-401 in a Phase 1b study in patients with metastatic melanoma, SER-301 for ulcerative colitis and SER-155 to prevent mortality due to gastrointestinal infections, bacteremia and graft versus host disease.