Ultragenyx Pharmaceutical(US:RARE) Globenewswire·2026-02-23 14:31Core Viewpoint - The Ultragenyx Pharmaceutical Inc. is facing a class action lawsuit due to alleged violations of the Securities Exchange Act of 1934, with claims that the company and its executives made misleading statements regarding the efficacy of their drug setrusumab for treating Osteogenesis Imperfecta [1][3]. Company Overview - Ultragenyx is a biopharmaceutical company focused on developing treatments for rare and ultra-rare genetic diseases [2]. Allegations of the Lawsuit - The lawsuit claims that Ultragenyx misrepresented the reliability of information regarding setrusumab's effects on patients and downplayed the risks associated with the Phase III Orbit study, which ultimately failed to show statistically significant results [3]. - On July 9, 2025, Ultragenyx disclosed that the Phase III Orbit study did not achieve statistical significance for its second interim analysis, leading to a stock price drop of over 25% [4]. - Following a December 29, 2025 announcement that both the Phase III Orbit and Cosmic studies failed to meet primary endpoints, Ultragenyx's stock fell more than 42% [5]. Lead Plaintiff Process - The Private Securities Litigation Reform Act of 1995 allows investors who purchased Ultragenyx common stock during the class period to seek appointment as lead plaintiff, representing the interests of the class [6]. Law Firm Background - Robbins Geller Rudman & Dowd LLP is a leading firm in securities fraud and shareholder rights litigation, having recovered over $916 million for investors in 2025 alone, and a total of $8.4 billion over the past five years [7].