Class Action Lawsuits Filed Against Atara, Ultragenyx, Mereo, and Vistagen Over Alleged Misstatements
Mar 28, 2026
Class action lawsuits allege false statements about clinical trial results and regulatory prospects at Atara Biotherapeutics, Ultragenyx, Mereo BioPharma, and Vistagen Therapeutics. The complaints cite failed Phase 3 studies for setrusumab in Osteogenesis Imperfecta and fasedienol for social anxiety disorder, along with manufacturing issues affecting Atara's tabelecleucel application. Investors have deadlines ranging from April to May 2026 to seek lead plaintiff status.