TMX Newsfile·2026-02-21 03:26Core Viewpoint - Rosen Law Firm is reminding investors who purchased common stock of Ultragenyx Pharmaceutical Inc. during the specified class period of the upcoming lead plaintiff deadline for a class action lawsuit [1]. Group 1: Class Action Details - Investors who bought Ultragenyx common stock between August 3, 2023, and December 26, 2025, may be entitled to compensation without any out-of-pocket fees through a contingency fee arrangement [2]. - A class action lawsuit has already been filed, and those wishing to serve as lead plaintiff must act by April 6, 2026 [3]. - Investors can join the class action by visiting the provided link or contacting the law firm directly for more information [7]. Group 2: Legal Representation - Rosen Law Firm emphasizes the importance of selecting qualified legal counsel with a proven track record in securities class actions, highlighting their own success in recovering significant amounts for investors [4]. - The firm has been recognized for its achievements in securities class action settlements, including a notable settlement against a Chinese company and ranking highly in the number of settlements since 2013 [4]. Group 3: Case Background - The lawsuit alleges that Ultragenyx's management provided misleading information regarding the efficacy of setrusumab (UX 143) in clinical trials for Osteogenesis Imperfecta, leading to inflated stock prices [5][6]. - It is claimed that while setrusumab increased bone density, it did not correlate with a decrease in fracture rates, contrary to management's assertions [6].