FDA approved Fresenius Kabi and Formycon's Otulfi™ (ustekinumab-aauz) as the fourth biosimilar of Janssen/Johnson & Johnson’s Stelara® (ustekinumab) on September 27, 2024, following Amgen’s Wezlana™, Alvotech/Teva’s Selarsdi™, and Samsung Bioepis/Sandoz’s Pyzchiva®. Otulfi™ received EU approval on the same day. Under settlement agreements, Otulfi™, Wezlana™, Selarsdi™, and Pyzchiva® can enter the U.S. market by February 2025. Numerous Stelara® biosimilars await FDA approval, with no pending patent disputes.