Data highlight both SER-603's rational design that targets microbial functions linked to mucosal healing and gastrointestinal inflammation in IBD, as well as the advancement of microbiome-based biomarkers that inform response to biologics and patient stratification

Presentation selected for DDW ‘Poster of Distinction' recognition

CAMBRIDGE, Mass., May 04, 2026 (GLOBE NEWSWIRE) -- Seres Therapeutics, Inc. (NASDAQ:MCRB) (Seres or the Company), a leading live biotherapeutics company, today announced new preclinical data supporting the design and potential of SER-603, a next-generation cultivated live biotherapeutic candidate for inflammatory bowel disease (IBD), being presented at Digestive Disease Week (DDW) 2026, taking place May 2–5, 2026, in Chicago, IL. The poster, titled "The Rational Design of SER-603: A Next Generation Cultivated Microbial Consortia to Treat IBD," which has been selected as a DDW ‘Poster of Distinction,' highlights Seres' integrated approach to the design of microbiome therapeutics, combining rational strain selection and a novel biomarker-driven patient stratification.