Travere Therapeutics, Inc., a biopharmaceutical company, identifies, develops, and delivers therapies to people living with rare kidney and metabolic diseases. Its products include FILSPARI (sparsentan), a once-daily, oral medication designed to target two critical pathways in the disease progression of IgA Nephropathy (endothelin 1 and angiotensin-II); and Thiola and Thiola EC (tiopronin tablets) for the treatment of cystinuria, a rare genetic cystine transport disorder that causes high cystine levels in the urine and the formation of recurring kidney stones. The company's clinical-stage programs consist of Sparsentan, a novel investigational product candidate, which has been granted Orphan Drug Designation for the treatment of focal segmental glomerulosclerosis in the U.S. and Europe; and Pegtibatinase (TVT-058), a novel investigational human enzyme replacement candidate being evaluated for the treatment of classical homocystinuria. It has a cooperative research and development agreement with National Institutes of Health's National Center for Advancing Translational Sciences and Alagille Syndrome Alliance for the identification of potential small molecule therapeutics for Alagille syndrome. The company was formerly known as Retrophin, Inc. and changed its name to Travere Therapeutics, Inc. in November 2020. Travere Therapeutics, Inc. was incorporated in 2008 and is headquartered in San Diego, California.

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.

Calliditas Therapeutics AB (publ), a commercial-stage bio-pharmaceutical company, focused on identifying, developing, and commercializing novel treatments in orphan indications with an initial focus on renal and hepatic diseases with significant unmet medical needs in the United States, Europe, and Asia. It offers Nefecon (TARPEYO/Kinpeygo), an oral formulation of budesonide to reduce the loss of kidney function in adults with immunoglobulin A nephropathy. The company's lead compound is Setanaxib, a NOX inhibitor that is in Phase 2b clinical trial for the treatment of primary biliary cholangitis; and in Phase 2 clinical trial for the treatment of squamous cell carcinoma of the head and neck cancer and idiopathic pulmonary fibrosis, as well as for solid tumors and Alport Syndrome. Calliditas Therapeutics AB (publ) was incorporated in 2004 and is headquartered in Stockholm, Sweden. As of September 13, 2024, Calliditas Therapeutics AB (publ) operates as a subsidiary of Asahi Kasei Corporation.

CorMedix Inc., a biopharmaceutical company, focuses on developing and commercializing therapeutic products for the prevention and treatment of infectious and inflammatory diseases in the United States. Its lead product candidate is DefenCath, an antimicrobial catheter lock solution to reduce the incidence of catheter-related bloodstream infections in adult patients with kidney failure. The company was formerly known as Picton Holding Company, Inc. and changed its name to CorMedix, Inc. in January 2007. CorMedix Inc. was incorporated in 2006 and is based in Berkeley Heights, New Jersey.

DiaMedica Therapeutics Inc., a clinical stage biopharmaceutical company, focuses on improving the lives of people suffering from serious diseases with a focus on acute ischemic stroke. Its lead candidate is DM199, a pharmaceutically active recombinant form of the human tissue kallikrein-1 protein, which is in Phase II/III trials for the treatment of acute ischemic stroke, as well as that is in Phase 2 to treat cardio-renal disease. The company also develops DM300, which is in preclinical stage for the treatment of severe inflammatory diseases. In addition, it develops treatment for neurological disease. The company was formerly known as DiaMedica Inc. and changed its name to DiaMedica Therapeutics Inc. in December 2016. DiaMedica Therapeutics Inc. was incorporated in 2000 and is headquartered in Minneapolis, Minnesota.

Aldeyra Therapeutics, Inc., a biotechnology company, develops and commercializes medicines for immune-mediated diseases. Its lead product candidate is reproxalap, a reactive aldehyde species (RASP)modulator, which is in Phase III clinical trial for the treatment of dry eye diseases. The company also develops ADX-629, an orally administered RASP modulator for treatment of COVID-19, atopic asthma, psoriasis, and alcohol intoxication; and ADX-2191, a dihydrofolate reductase inhibitor for the treatment retinitis pigmentosa, as well as rare retinal diseases characterized by inflammation and vision loss. In addition, it develops ADX-246 in systemic immune-mediated disease; and ADX-248 in geographic atrophy. The company was formerly known as Aldexa Therapeutics, Inc. and changed its name to Aldeyra Therapeutics, Inc. in March 2014. Aldeyra Therapeutics, Inc. was incorporated in 2004 and is based in Lexington, Massachusetts.

Unicycive Therapeutics, Inc., a biotechnology company, develops treatments for various medical conditions in the United States. Its drug candidates include UNI 494, a pro-drug of Nicorandil that is being developed as a treatment for acute kidney injury; and Renazorb (Oxylanthanum Carbonate), which is being developed for the treatment of hyperphosphatemia in patients with chronic kidney disease. Unicycive Therapeutics, Inc. has license agreements with Shilpa Medicare Ltd; Sphaera Pharma Pte. Ltd.; Syneos Health LLC; Inotiv; Lee's Pharmaceutical (HK) Limited; Celerion; and Lotus International Pte Ltd. The company was incorporated in 2016 and is based in Los Altos, California.

Cyclerion Therapeutics, Inc., a biopharmaceutical company, develops treatments for serious diseases. It is developing Olinciguat, an orally administered vascular soluble guanylate cyclase (sGC) stimulator, which is in Phase 2 clinical trial to out-license for cardiovascular diseases; and Praliciguat, a systemic sGC stimulator that is licensed to Akebia Therapeutics, Inc. for the treatment of rare kidney disease. The company was incorporated in 2018 and is headquartered in Cambridge, Massachusetts.