Ultragenyx 72 Hour Deadline Alert: Kahn Swick & Foti, LLC Reminds Investors With Losses In Excess Of $100,000 of Deadline in Class Action Lawsuit Against Ultragenyx Pharmaceutical Inc. - RARE

NEW YORK & NEW ORLEANS--(BUSINESS WIRE)--Kahn Swick & Foti, LLC (“KSF”) and KSF partner, the former Attorney General of Louisiana, Charles C. Foti, Jr., remind investors that they have until April 6, 2026 to file lead plaintiff applications in a securities class action lawsuit against Ultragenyx Pharmaceutical Inc. (“Ultragenyx” or the “Company”) (NasdaqGS: RARE), if they purchased or otherwise acquired the Company’s securities between August 3, 2023 and December 26, 2025, inclusive (the “Class Period”). This action is pending in the United States District Court for the Northern District of California.

What You May Do

If you purchased securities of Ultragenyx and would like to discuss your legal rights and how this case might affect you and your right to recover for your economic loss, you may, without obligation or cost to you, contact KSF Managing Partner Lewis Kahn toll-free at 1-877-515-1850 or via email ([e-mail]), or visit https://www.ksfcounsel.com/cases/nasdaqgs-rare/ to learn more. If you wish to serve as a lead plaintiff in this class action by overseeing lead counsel with the goal of obtaining a fair and just resolution, you must request this position by application to the Court by April 6, 2026.

About the Lawsuit

Ultragenyx and certain of its executives are charged with failing to disclose material information during the Class Period, violating federal securities laws.

On December 26, 2025, the Company announced the “results from the Phase 3 Orbit and Cosmic studies for setrusumab (UX143) in Osteogenesis Imperfecta” disclosing that both its Phase III Orbit and Cosmic studies failed to demonstrate that setrusumab triggered a statistically significant reduction in annualized fracture rates for patients with osteogenesis imperfecta, and, as a result the Company “is evaluating its planned operations and will promptly define and implement significant expense reductions.” On this news, the price of Ultragenyx’s shares fell approximately 42%, from $34.19 per share on December 26, 2025 to $19.72 per share on December 29, 2025.

The case is Steven Bailey v. Ultragenyx Pharmaceutical Inc., et al., No. 26-cv-01097.

About Kahn Swick & Foti, LLC

KSF, whose partners include former Louisiana Attorney General Charles C. Foti, Jr., is one of the nation's premier boutique securities litigation law firms. This past year, KSF was ranked by SCAS among the top 10 firms nationally based upon total settlement value. KSF serves a variety of clients, including public and private institutional investors, and retail investors - in seeking recoveries for investment losses emanating from corporate fraud or malfeasance by publicly traded companies. KSF has offices in New York, Delaware, California, Louisiana, Chicago, and a representative office in Luxembourg.

TOP 10 Plaintiff Law Firms - According to ISS Securities Class Action Services

To learn more about KSF, you may visit www.ksfcounsel.com.

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