Rhythm Pharmaceuticals, Inc., a commercial-stage biopharmaceutical company, focuses on the rare neuroendocrine diseases. The company's lead product candidate is IMCIVREE (setmelanotide), a rare melanocortin-4 receptor for the treatment of pro-opiomelanocortin (POMC), proprotein convertase subtilisin/kexin type 1, leptin receptor (LEPR) deficiency obesity, and Bardet-Biedl and Alström syndrome. It is in Phase 3 clinical trials for treating POMC or LEPR heterozygous deficiency obesities, steroid receptor coactivator 1 deficiency obesity, SH2B1 deficiency obesity, MC4 receptor deficiency obesity, and other MC4R disorders. The company has licensing agreements with LG Chem, Ltd; Ipsen Pharma S.A.S; Camurus; RareStone Group Ltd.; joint research collaboration with Axovia Therapeutics for developing in bardet-biedl syndrome; and LG Chem, Ltd. The company was formerly known as Rhythm Metabolic, Inc. and changed its name to Rhythm Pharmaceuticals, Inc. in October 2015. Rhythm Pharmaceuticals, Inc. was founded in 2008 and is headquartered in Boston, Massachusetts.

Seres Therapeutics, Inc., a microbiome therapeutics company, develop microbiome therapeutics to treat the modulation of the colonic microbiome. It develops a novel class of biological drugs that are designed to treat by modulating the microbiome to restore health by repairing the function of a disrupted microbiome to a non-disease state. The company's lead product candidate is VOWST, an oral microbiome therapeutic that has completed Phase III clinical trial for the treatment of recurrent Clostridioides difficile infection. Its product pipeline also includes SER-155, an investigational oral fermented microbiome therapeutic which is in Phase 1b clinical trials for the treatment of gastrointestinal infections, bacteremia, and graft versus host disease in immunocompromised patients including patients receiving allogeneic hematopoietic stem cell transplantation. In addition, the company engages in the development of SER-287 which is in Phase 2b and SER-301 that is in Phase 1b to treat ulcerative colitis. Further, it has license Agreement with NHSc Rx License GmbH for the therapeutic products based on the microbiome technology, which includes VOWST product candidate, which is developed for the treatment of CDI and recurrent CDI; and collaboration license agreement with Société des Produits Nestlé S.A. (Nestlé) for the development and commercialization of certain product candidates for the treatment and management of CDI and inflammatory bowel disease including UC and Crohn's disease. The company was formerly known as Seres Health, Inc. and changed its name to Seres Therapeutics, Inc. in May 2015. Seres Therapeutics, Inc. was incorporated in 2010 and is headquartered in Cambridge, Massachusetts.

Ardelyx, Inc., a biopharmaceutical company, discovers, develops, and commercializes medicines to treat gastrointestinal and cardiorenal therapeutic areas in the United States and internationally. The company's lead product candidate is tenapanor for the treatment of patients with irritable bowel syndrome with constipation. It also develops XPHOZAH, which is in Phase III clinical trial to reduce serum phosphorus in adults with chronic kidney disease (CKD)on dialysis, or hyperphosphatemia; RDX013, a potassium secretagogue, for the treatment of elevated serum potassium, or hyperkalemia, a problem among patients with kidney and/or heart failure; and RDX020, for adult patients with metabolic acidosis, a serious electrolyte disorder. The company has agreements with Kyowa Kirin, Fosun Pharmaceutical Industrial Development Co. Ltd., and Knight Therapeutics, Inc. for the development and commercialization of tenapanor in their respective territories. The company was formerly known as Nteryx, Inc. and changed its name to Ardelyx, Inc. in June 2008. Ardelyx, Inc. was incorporated in 2007 and is headquartered in Waltham, Massachusetts.

Spyre Therapeutics, Inc., a preclinical stage biotechnology company, focuses on developing therapeutics for patients living with inflammatory bowel disease (IBD). It develops SPY001, a human monoclonal immunoglobulin G1 antibody designed to bind selectively to the a4ß7 integrin being developed for the treatment of IBD (ulcerative colitis and Crohn's disease). The company is also developing SPY002, a human monoclonal antibody (mAb)candidates designed to bind to tumor necrosis factor-like ligand 1A; and SPY120, a combination of SPY001 (anti-a4ß7) and SPY002 (anti-TL1A) antibodies, which are in preclinical studies. In addition, its other early-stage programs include SPY003, an anti-IL-23 mAb; SPY004, a novel mechanism of action (MOA) mAb; SPY130, a combination of anti-a4ß7 and anti-IL-23 mAbs; and SPY230, a combination of anti-TL1A and anti-IL-23 mAbs. The company was formerly known as Aeglea BioTherapeutics, Inc. and changed its name to Spyre Therapeutics, Inc. in November 2023. Spyre Therapeutics, Inc. was incorporated in 2013 and is based in Waltham, Massachusetts.

Entero Therapeutics, Inc., a clinical-stage biopharmaceutical company, engages in the development of targeted and orally delivered therapies for the treatment of patients with gastrointestinal diseases. The company's pipeline candidates include latiglutenase, a targeted oral biotherapeutic for celiac disease designed to breakdown gluten into non-immunogenic peptides, currently under Phase 2 studies; and capeserod, a selective 5-HT4 receptor partial agonist under Phase 1 studies for the treatment of gastroparesis. It is also involved in the development of adrulipase, a recombinant lipase enzyme designed to enable the digestion of fats and other nutrients, currently under Phase 2 studies for the treatment of exocrine pancreatic insufficiency in patients with cystic fibrosis and chronic pancreatitis; and niclosamide, an oral small molecule with anti-inflammatory inhibitor therapy, currently under Phase 2 studies for the treatment of ulcerative proctitis and ulcerative proctosigmoiditis, as well as immune checkpoint inhibitor-associated colitis and diarrhea in metastatic cancer patients. The company was formerly known as First Wave BioPharma, Inc. and changed its name to Entero Therapeutics, Inc. in May 2024. Entero Therapeutics, Inc. was incorporated in 2014 and is based in Boca Raton, Florida.

First Wave BioPharma, Inc., a clinical-stage biopharmaceutical company, engages in the research and development of targeted and non-systemic therapies for the treatment of patients with gastrointestinal diseases. Its product candidates include latiglutenase, a targeted oral biotherapeutic for celiac disease designed to breakdown gluten into non-immunogenic peptides; biologic adrulipase, a recombinant lipase enzyme designed to enable the digestion of fats and other nutrients; capeserod, a selective 5-HT4 receptor partial agonist to treat gastroparesis; and niclosamide, an oral small molecule with anti-inflammatory properties for patients with inflammatory bowel diseases, such as ulcerative colitis and Crohn's disease. It is also developing CypCel, a disease management tool for monitoring the intestinal health of recovering celiac disease patients. The company was formerly known as AzurRx BioPharma, Inc. and changed its name to First Wave BioPharma, Inc. in September 2021. First Wave BioPharma, Inc. was incorporated in 2014 and is headquartered in Boca Raton, Florida.

Morphic Holding, Inc., a biopharmaceutical company, discovers and develops oral small-molecule integrin therapeutics for the treatment of autoimmune, cardiovascular, and metabolic diseases, as well as fibrosis and cancer. Its lead product candidate MORF-057, an a4ß7-specific integrin inhibitor affecting inflammation is in Phase 2 clinical trials for the treatment of inflammatory bowel disease. The company's products in pipeline include Next Gen a4ß7 Inhibitors for additional potential GI indications, such as EGIDs, pouchitis, etc.; avß8 for the treatment of Myelofibrosis and solid tumor; and fibronectin integrin for pulmonary hypertensive. In addition, it has a license agreement with Janssen to discover and develop novel integrin therapeutics; collaboration agreement with Schrödinger for integrin targets; and license agreement with Children's Medical Center Corporation to develop and commercialize products worldwide for any therapeutic or diagnostic use in humans and veterinary applications. Morphic Holding, Inc. was incorporated in 2014 and is headquartered in Waltham, Massachusetts.

Finch Therapeutics Group, Inc., a clinical-stage microbiome therapeutics company, develops a novel class of orally administered biological drugs in the United States. The company develops FIN-211, a microbiome candidate designed to address the gastrointestinal and behavioral symptoms of autism spectrum disorder; and FIN-524 for the prevention, diagnosis, theragnosis or treatment of diseases in humans, including ulcerative colitis; FIN-525 for the treatment of Crohn's disease; and other microbiome product candidates. The company has collaboration and license agreements with Takeda Pharmaceutical Company Limited; and license agreements with Skysong Innovations LLC, OpenBiome, Arizona State University, and University of Minnesota. Finch Therapeutics Group, Inc. was incorporated in 2014 and is based in Boston, Massachusetts.