A securities class action lawsuit has been filed against Ultragenyx Pharmaceutical Inc. and certain officers, seeking damages for alleged federal securities law violations. The suit covers investors who purchased or acquired Ultragenyx securities between Aug. 3, 2023 and Dec. 26, 2025, and alleges the company made false or misleading statements and omissions about the Phase III Orbit study of setrusumab for osteogenesis imperfecta, including risks around interim analysis benchmarks and reliance on Phase II results without a placebo control. Investors who suffered losses have until April 6, 2026 to seek appointment as lead plaintiff.
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