Ultragenyx Pharmaceutical Class Action Notice
Written by Emily J. Thompson, Senior Investment Analyst
Updated: Mar 18 2026
0mins
Should l Buy RARE?
Source: Globenewswire
- Class Action Notice: Rosen Law Firm reminds investors who purchased Ultragenyx Pharmaceutical Inc. (NASDAQ: RARE) common stock between August 3, 2023, and December 26, 2025, to apply as lead plaintiffs by April 6, 2026, to potentially receive compensation without any out-of-pocket fees.
- Lawsuit Background: The lawsuit alleges that defendants provided materially false and misleading information regarding the expected results of setrusumab (UX 143) in Phase III Orbit and Cosmic studies, leading investors to purchase shares at artificially inflated prices, resulting in damages.
- Law Firm's Advantage: Rosen Law Firm specializes in securities class actions and has achieved the largest settlement against a Chinese company, highlighting its successful track record, which investors should consider when selecting legal counsel.
- Investor Action Recommendation: Investors can visit the Rosen Law Firm website or call the toll-free number for more information on joining the lawsuit, noting that no class has been certified yet, allowing them to choose their legal representation or remain absent from the class.
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Analyst Views on RARE
Wall Street analysts forecast RARE stock price to rise
18 Analyst Rating
17 Buy
1 Hold
0 Sell
Strong Buy
Current: 20.000
Low
35.00
Averages
61.65
High
120.00
Current: 20.000
Low
35.00
Averages
61.65
High
120.00
About RARE
Ultragenyx Pharmaceutical Inc. is a biopharmaceutical company. The Company is focused on the identification, acquisition, development, and commercialization of novel products for the treatment of serious rare and ultrarare genetic diseases. Its therapies and clinical-stage pipeline consist of four product categories: biologics, small molecules, AAV gene therapy, and nucleic acid product candidates. Its four approved product candidates include Crysvita (burosumab) for the treatment of X-linked hypophosphatemia (XLH), and tumor-induced osteomalacia (TIO), Mepsevii (vestronidase alfa) for the treatment of mucopolysaccharidosis VII (MPSVII) or Sly Syndrome, Dojolvi (triheptanoin) for the treatment of long-chain fatty acid oxidation disorders (LC-FAOD), and Evkeeza (evinacumab) for the treatment of homozygous familial hypercholesterolemia (HoFH). Its clinical product candidates include DTX401, DTX301, UX701, UX143, UX111, and GTX-102. UX143 for the treatment of Osteogenesis Imperfecta.
About the author
Emily J. Thompson
Emily J. Thompson, a Chartered Financial Analyst (CFA) with 12 years in investment research, graduated with honors from the Wharton School. Specializing in industrial and technology stocks, she provides in-depth analysis for Intellectia’s earnings and market brief reports.
Class Action Lawsuit Reminder Against Ultragenyx Pharmaceutical Inc.
- Lawsuit Background: DJS Law Group reminds investors of a class action lawsuit against Ultragenyx Pharmaceutical for violations of securities laws, affecting shareholders from August 3, 2023, to December 26, 2025, with a deadline of April 6, 2026.
- False Statements: The complaint alleges that Ultragenyx made false and misleading statements regarding its Phase III trial performance, creating overly optimistic expectations despite failing to meet statistically significant endpoints, misleading investors throughout the class period.
- Investor Losses: Affected shareholders are encouraged to contact DJS Law Group to participate in the recovery process, indicating that the company may face significant financial liabilities, which could undermine shareholder confidence and market performance.
- Legal Services: DJS Law Group specializes in securities class actions and corporate governance litigation, aiming to assist clients in recovering losses through aggressive legal advocacy, showcasing its expertise and influence in complex legal matters.
See More
Ultragenyx Pharmaceutical Faces Class Action for Securities Fraud
- Class Action Reminder: The Schall Law Firm alerts investors of a class action lawsuit against Ultragenyx Pharmaceutical for violations of securities laws, concerning securities transactions from August 3, 2023, to December 26, 2025, with a deadline to contact the firm by April 6, 2026, for participation.
- False Statements Exposed: The complaint alleges that Ultragenyx made false and misleading statements regarding its drug candidate's effects on patients with Osteogenesis Imperfecta, leading investors to have an incorrect optimistic outlook on the company's future performance, which impacted their investment decisions.
- Clinical Trial Failure: The company's Phase III ORBIT study failed to achieve a statistically significant reduction in annualized fracture rate, revealing significant errors in the company's understanding of its drug's efficacy, further exacerbating investor losses.
- Legal Consequences: As the market became aware of Ultragenyx's true situation, investors suffered losses, prompting the Schall Law Firm to encourage affected shareholders to join the lawsuit for compensation, highlighting serious deficiencies in the company's transparency and compliance.
See More
Ultragenyx Pharmaceutical Class Action Lawsuit Update
- Lawsuit Timeline: Ultragenyx Pharmaceutical faces a class action lawsuit for false statements made between August 3, 2023, and December 26, 2025, with investors needing to apply as lead plaintiff by April 6, 2026, highlighting significant legal risks and potential financial losses for the company.
- Stock Price Volatility: Following the announcement on July 9, 2025, that the Phase III Orbit study failed to achieve statistical significance, Ultragenyx's stock plummeted over 25%, and after the December 29, 2025, announcement of further study failures, the stock fell another 42%, reflecting extreme market pessimism regarding the company's future.
- Details of Legal Allegations: The lawsuit alleges that Ultragenyx and its executives made misleading statements regarding the risks associated with Osteogenesis Imperfecta, failing to disclose critical information that severely undermined investor confidence and could impact the company's ability to raise funds.
- Role of Robbins Geller: Robbins Geller, a leading class action law firm, recovered over $916 million for investors in 2025, showcasing its strength in securities fraud cases, which may significantly influence the outcome of the Ultragenyx lawsuit.
See More
Ultragenyx Pharmaceutical Faces Class Action for Securities Fraud
- Class Action Filed: Bronstein, Gewirtz & Grossman, LLC has initiated a class action lawsuit against Ultragenyx Pharmaceutical and its executives, seeking damages for investors who purchased securities between August 3, 2023, and December 26, 2025, reflecting significant investor dissatisfaction with the company's transparency.
- Allegations of Misrepresentation: The complaint alleges that throughout the class period, defendants made false or misleading statements and failed to disclose risks associated with the Phase III Orbit study on Osteogenesis Imperfecta, leading investors to have a distorted view of the company's prospects.
- Investor Action Deadline: Affected investors must request to be appointed as lead plaintiff by April 6, 2026, indicating the importance of investor initiative in legal proceedings and potentially influencing future compensation outcomes.
- Law Firm Credentials: Bronstein, Gewirtz & Grossman, LLC specializes in securities fraud class actions and has recovered hundreds of millions for investors nationwide, underscoring its critical role in upholding market integrity and protecting investor rights.
See More
Faruqi & Faruqi Encourages Ultragenyx Investors to Reach Out
- Legal Action Reminder: Faruq & Faruqi, LLP is investigating potential claims against Ultragenyx Pharmaceutical Inc, specifically targeting investors who purchased or acquired securities between August 3, 2023, and December 26, 2025, reminding them of their legal rights.
- Investor Contact Information: Investors who have suffered losses are encouraged to contact Faruq & Faruqi's Securities Litigation Partner, Josh Wilson, directly at 877-247-4292 or 212-983-9330 (Ext. 1310) to discuss their legal options.
- Class Action Deadline: The firm reminds investors that the deadline to seek the role of lead plaintiff in the federal securities class action against Ultragenyx is April 6, 2026, urging investors to act before this date to protect their rights.
- Potential Claims Investigation: As a leading national securities law firm, Faruq & Faruqi is actively investigating potential claims against Ultragenyx, demonstrating a commitment to investor rights that may impact the company's reputation and stock price.
See More
Ultragenyx Pharmaceutical Class Action Reminder
- Class Action Notice: Rosen Law Firm reminds investors who purchased Ultragenyx Pharmaceutical (NASDAQ: RARE) common stock between August 3, 2023, and December 26, 2025, to apply as lead plaintiffs by April 6, 2026, to potentially receive compensation without any out-of-pocket costs.
- Lawsuit Background: The lawsuit alleges that defendants misled investors regarding the efficacy of setrusumab (UX 143) in treating Osteogenesis Imperfecta (OI), concealing critical negative information that led to inflated stock purchases and subsequent investor losses.
- Law Firm Credentials: Rosen Law Firm specializes in securities class actions and has achieved the largest securities class action settlement against a Chinese company, highlighting its expertise and successful track record, which investors should consider when selecting legal counsel.
- Investor Action Recommendations: Investors can visit Rosen Law Firm's website or call their toll-free number for more information; although a class has not yet been certified, investors may choose to retain or change counsel to safeguard their interests.
See More
Class Action Lawsuit Reminder Against Ultragenyx Pharmaceutical Inc.
- Lawsuit Background: DJS Law Group reminds investors of a class action lawsuit against Ultragenyx Pharmaceutical for violations of securities laws, affecting shareholders from August 3, 2023, to December 26, 2025, with a deadline of April 6, 2026.
- False Statements: The complaint alleges that Ultragenyx made false and misleading statements regarding its Phase III trial performance, creating overly optimistic expectations despite failing to meet statistically significant endpoints, misleading investors throughout the class period.
- Investor Losses: Affected shareholders are encouraged to contact DJS Law Group to participate in the recovery process, indicating that the company may face significant financial liabilities, which could undermine shareholder confidence and market performance.
- Legal Services: DJS Law Group specializes in securities class actions and corporate governance litigation, aiming to assist clients in recovering losses through aggressive legal advocacy, showcasing its expertise and influence in complex legal matters.
See More
Ultragenyx Pharmaceutical Faces Class Action for Securities Fraud
- Class Action Reminder: The Schall Law Firm alerts investors of a class action lawsuit against Ultragenyx Pharmaceutical for violations of securities laws, concerning securities transactions from August 3, 2023, to December 26, 2025, with a deadline to contact the firm by April 6, 2026, for participation.
- False Statements Exposed: The complaint alleges that Ultragenyx made false and misleading statements regarding its drug candidate's effects on patients with Osteogenesis Imperfecta, leading investors to have an incorrect optimistic outlook on the company's future performance, which impacted their investment decisions.
- Clinical Trial Failure: The company's Phase III ORBIT study failed to achieve a statistically significant reduction in annualized fracture rate, revealing significant errors in the company's understanding of its drug's efficacy, further exacerbating investor losses.
- Legal Consequences: As the market became aware of Ultragenyx's true situation, investors suffered losses, prompting the Schall Law Firm to encourage affected shareholders to join the lawsuit for compensation, highlighting serious deficiencies in the company's transparency and compliance.
See More
Ultragenyx Pharmaceutical Class Action Lawsuit Update
- Lawsuit Timeline: Ultragenyx Pharmaceutical faces a class action lawsuit for false statements made between August 3, 2023, and December 26, 2025, with investors needing to apply as lead plaintiff by April 6, 2026, highlighting significant legal risks and potential financial losses for the company.
- Stock Price Volatility: Following the announcement on July 9, 2025, that the Phase III Orbit study failed to achieve statistical significance, Ultragenyx's stock plummeted over 25%, and after the December 29, 2025, announcement of further study failures, the stock fell another 42%, reflecting extreme market pessimism regarding the company's future.
- Details of Legal Allegations: The lawsuit alleges that Ultragenyx and its executives made misleading statements regarding the risks associated with Osteogenesis Imperfecta, failing to disclose critical information that severely undermined investor confidence and could impact the company's ability to raise funds.
- Role of Robbins Geller: Robbins Geller, a leading class action law firm, recovered over $916 million for investors in 2025, showcasing its strength in securities fraud cases, which may significantly influence the outcome of the Ultragenyx lawsuit.
See More
Ultragenyx Pharmaceutical Faces Class Action for Securities Fraud
- Class Action Filed: Bronstein, Gewirtz & Grossman, LLC has initiated a class action lawsuit against Ultragenyx Pharmaceutical and its executives, seeking damages for investors who purchased securities between August 3, 2023, and December 26, 2025, reflecting significant investor dissatisfaction with the company's transparency.
- Allegations of Misrepresentation: The complaint alleges that throughout the class period, defendants made false or misleading statements and failed to disclose risks associated with the Phase III Orbit study on Osteogenesis Imperfecta, leading investors to have a distorted view of the company's prospects.
- Investor Action Deadline: Affected investors must request to be appointed as lead plaintiff by April 6, 2026, indicating the importance of investor initiative in legal proceedings and potentially influencing future compensation outcomes.
- Law Firm Credentials: Bronstein, Gewirtz & Grossman, LLC specializes in securities fraud class actions and has recovered hundreds of millions for investors nationwide, underscoring its critical role in upholding market integrity and protecting investor rights.
See More
Faruqi & Faruqi Encourages Ultragenyx Investors to Reach Out
- Legal Action Reminder: Faruq & Faruqi, LLP is investigating potential claims against Ultragenyx Pharmaceutical Inc, specifically targeting investors who purchased or acquired securities between August 3, 2023, and December 26, 2025, reminding them of their legal rights.
- Investor Contact Information: Investors who have suffered losses are encouraged to contact Faruq & Faruqi's Securities Litigation Partner, Josh Wilson, directly at 877-247-4292 or 212-983-9330 (Ext. 1310) to discuss their legal options.
- Class Action Deadline: The firm reminds investors that the deadline to seek the role of lead plaintiff in the federal securities class action against Ultragenyx is April 6, 2026, urging investors to act before this date to protect their rights.
- Potential Claims Investigation: As a leading national securities law firm, Faruq & Faruqi is actively investigating potential claims against Ultragenyx, demonstrating a commitment to investor rights that may impact the company's reputation and stock price.
See More
Ultragenyx Pharmaceutical Class Action Reminder
- Class Action Notice: Rosen Law Firm reminds investors who purchased Ultragenyx Pharmaceutical (NASDAQ: RARE) common stock between August 3, 2023, and December 26, 2025, to apply as lead plaintiffs by April 6, 2026, to potentially receive compensation without any out-of-pocket costs.
- Lawsuit Background: The lawsuit alleges that defendants misled investors regarding the efficacy of setrusumab (UX 143) in treating Osteogenesis Imperfecta (OI), concealing critical negative information that led to inflated stock purchases and subsequent investor losses.
- Law Firm Credentials: Rosen Law Firm specializes in securities class actions and has achieved the largest securities class action settlement against a Chinese company, highlighting its expertise and successful track record, which investors should consider when selecting legal counsel.
- Investor Action Recommendations: Investors can visit Rosen Law Firm's website or call their toll-free number for more information; although a class has not yet been certified, investors may choose to retain or change counsel to safeguard their interests.
See More
