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Gossamer Bio, Inc., a clinical-stage biopharmaceutical company, focuses on developing and commercializing seralutinib for the treatment of pulmonary arterial hypertension (PAH) in the United States. The company is developing GB002, an inhaled, small molecule, platelet-derived growth factor receptor, or PDGFR, colony-stimulatin factor 1 receptor and c-KIT inhibitor, which is in Phase 3 clinical trial for the treatment of PAH. It has license agreements with Pulmokine, Inc. to develop and commercialize GB002 and related backup 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.

ImmunoGen, Inc., a commercial-stage biotechnology company, focuses on developing and commercializing the antibody-drug conjugates (ADCs) for cancer patients. The company's product candidates include mirvetuximab soravtansine, an ADC targeting folate-receptor alpha (FRa), for the treatment of platinum-resistant ovarian cancer; and a cell-surface protein expressed in various epithelial tumors, including ovarian, endometrial, and non-small-cell lung cancers, as well as Pivekimab sunirine, a CD123-targeting ADC that is in Phase II clinical trial for treating acute myeloid leukemia and blastic plasmacytoid dendritic cell neoplasm. Its preclinical programs include IMGC936, an ADC in co-development with MacroGenics, Inc.; and IMGN151, an anti-FRa product candidate. The company has collaborations with Roche; Amgen/Oxford BioTherapeutics; Bayer HealthCare AG; Eli Lilly and Company; Novartis Institutes for BioMedical Research, Inc.; CytomX Therapeutics, Inc.; Fusion Pharmaceuticals Inc.; Debiopharm International SA; and MacroGenics, Inc. ImmunoGen, Inc. was founded in 1980 and is headquartered in Waltham, Massachusetts. As of February 12, 2024, ImmunoGen, Inc. operates as a subsidiary of AbbVie Inc.

Omeros Corporation, a clinical-stage biopharmaceutical company, discovers, develops, and commercializes small-molecule and protein therapeutics, and orphan indications targeting immunologic diseases, including complement-mediated diseases, cancers, and addictive and compulsive disorders. The company's products under development include Narsoplimab (OMS721/MASP-2) that has completed pivotal trial for hematopoietic stem-cell transplant-associated thrombotic microangiopathy (TA-TMA); that is in Phase III clinical trial for the treatment of immunoglobulin A nephropathy (IgAN); and Phase II clinical trial to treat COVID-19. It also develops OMS1029 that is in phase I clinical trials for long-acting second-generation antibody targeting lectin pathway disorders; OMS906 that has completed phase II clinical trials for Paroxysmal nocturnal hemoglobinuria, complement 3 glomerulopathy, and other alternative pathway disorders; and OMS527 that is in phase I clinical trials for addictions and compulsive disorders, and movement disorders. In addition, the company's products under preclinical development comprise MASP-2, a pro-inflammatory protein target for the treatment of lectin pathway disorders; MASP-3 small-molecule inhibitors for alternative pathway disorders; and Adoptive T-Cell and Chimeric Antigen Receptor (CAR) T-Cell Therapies and Immunomodulators/Immunotoxins/Cancer Vaccines for the treatment of various cancers. Omeros Corporation was incorporated in 1994 and is headquartered in Seattle, Washington.

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.; 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.

Stoke Therapeutics, Inc., an early-stage biopharmaceutical company, develops medicines to treat the underlying causes of severe genetic diseases in the United States. The company utilizes its proprietary targeted augmentation of nuclear gene output to develop antisense oligonucleotides to selectively restore protein levels. Its lead clinical candidate is STK-002, which is in preclinical stage for the treatment of autosomal dominant optic atrophy. The company also develops STK-001, which is in phase I/II clinical trial to treat Dravet syndrome; and programs focused on multiple targets, including haploinsufficiency diseases of the central nervous system and eye. The company has a license and collaboration agreement with Acadia Pharmaceuticals Inc. for the discovery, development, and commercialization of novel RNA-based medicines for the treatment of severe and rare genetic neurodevelopmental diseases of the central nervous system. The company was formerly known as ASOthera Pharmaceuticals, Inc. and changed its name to Stoke Therapeutics, Inc. in May 2016. Stoke Therapeutics, Inc. was incorporated in 2014 and is headquartered in Bedford, Massachusetts.