Gossamer Bio, Inc., a clinical-stage biopharmaceutical company, focuses on discovering, acquiring, developing, and commercializing therapeutics in the disease areas of immunology, inflammation, and oncology in the United States. It is developing GB001, an oral antagonist of prostaglandin D2 receptor 2, which is in Phase IIb clinical trial for the treatment of moderate-to-severe eosinophilic asthma in Phase II clinical trial to treat patients with chronic rhinosinusitis with and without nasal polyps and in Phase 2 clinical trial in patients with chronic spontaneous urticarial. The company is also developing GB002, an orally inhaled, small molecule, platelet-derived growth factor receptor kinase inhibitor in Phase Ib clinical trial for the treatment of pulmonary arterial hypertension GB004, a gut-targeted, oral small molecule in Phase Ib clinical trial for the treatment of inflammatory bowel disease, including ulcerative colitis and Crohn's disease and GB1275, an oral, small molecule, CD11b modulator in Phase 1/2 clinical trial for the treatment of selected solid tumor types. It has license agreements with Pulmokine, Inc. to develop and commercialize GB002 and related backup compounds and Aerpio Pharmaceuticals, Inc. to develop and commercialize GB004 and related compounds. The company was formerly known as FSG, Bio, Inc. and changed its name to Gossamer Bio, Inc. in 2017. Gossamer Bio, Inc. was incorporated in 2015 and is headquartered in San Diego, California.