Calliditas Therapeutics AB (publ) (Nasdaq Stockholm: CALTX) operates as a commercial-stage biopharmaceutical company focused on developing and commercializing novel treatments for orphan indications, particularly rare renal and hepatic diseases including IgA nephropathy (IgAN). The company offers TARPEYO (budesonide) delayed release capsules, approved by the US FDA for reducing the loss of kidney function in adults at risk of rapidly progressing IgAN; Kinpeygo (budesonide) delayed release capsules, fully approved by the European Commission for IgAN treatment and marketed in the EEA, UK and Switzerland by partner STADA Arzneimittel AG; and investigational NOX inhibitor setanaxib in Phase 2 for hereditary nephritis and cancer indications; as well as partnerships for Nefecon commercialization including launches by Everest Medicines in China and Viatris in Japan. Founded in 2004 and headquartered in Stockholm, Sweden, Calliditas conducts operations across the US, Europe, China and Japan with offices in New York and Hoboken. In 2024, Asahi Kasei Corporation completed the acquisition of a 93.3% stake, positioning Calliditas as a wholly-owned subsidiary to expand global specialty pharma presence in renal and autoimmune diseases; partner Everest Medicines launched Nefecon commercially in China in May; STADA secured full European approval for Kinpeygo in July following positive CHMP opinion; Viatris initiated a Phase 3 Nefecon trial in Japan; positive topline Phase 2 results emerged for setanaxib in head and neck cancer; and TARPEYO gained an additional seven-year US orphan drug exclusivity while securing new patents for setanaxib in cancer.