Ultragenyx Pharmaceutical(US:RARE) TMX Newsfile·2026-02-20 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 eligible for 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: Law Firm Credentials - Rosen Law Firm has a strong track record in securities class actions, having achieved significant settlements, including the largest securities class action settlement against a Chinese company [4]. - The firm has been consistently ranked among the top firms for securities class action settlements and has recovered hundreds of millions of dollars for investors [4]. - In 2019, the firm secured over $438 million for investors, showcasing its effectiveness in litigation [4]. Group 3: Case Background - The lawsuit alleges that Ultragenyx's defendants provided misleading information regarding the expected results of their Phase III studies for setrusumab (UX 143) in treating Osteogenesis Imperfecta [5]. - It is claimed that while setrusumab increased bone density, it did not correlate with a decrease in annualized fracture rates, contrary to the defendants' statements [6]. - The misleading information led to Ultragenyx shareholders purchasing securities at inflated prices, resulting in damages when the true information was revealed [6].