Seres Therapeutics, Inc., a microbiome therapeutics platform company, engages in developing biological drugs that are designed to restore health by repairing the function of a dysbiotic microbiome. The company's lead product candidate is the SER-109, which is in Phase III clinical development for preventing recurrence of clostridium difficile infection (CDI). It is also developing SER-287 that is in Phase IIb study treat ulcerative colitis; SER-401, a microbiome therapeutic candidate, which is in Phase Ib study for use with checkpoint inhibitors in patients with metastatic melanoma; and SER-301, an Ecobiotic microbiome therapeutic candidate for the treatment of inflammatory bowel disease. In addition, the company engages in the development of SER-262, to treat an initial recurrence of CDI; and SER-155 to modulate the microbiome and dysbiosis in patients following allogeneic hematopoietic stem cell transplants. The company has license and collaboration agreement with Nestec Ltd. and Memorial Sloan Kettering Cancer Center, as well as collaboration with AstraZeneca. The company was formerly known as Seres Health, Inc. and changed its name to Seres Therapeutics, Inc. in May 2015. Seres Therapeutics, Inc. was founded in 2010 and is headquartered in Cambridge, Massachusetts