RARE Investors Have Opportunity to Lead Ultragenyx Pharmaceutical Inc. Securities Fraud Lawsuit with the Schall Law Firm

LOS ANGELES–(BUSINESS WIRE)–$RARE—The Schall Law Firm, a national shareholder rights litigation firm, reminds investors of a class action lawsuit against Ultragenyx Pharmaceutical Inc. (“Ultragenyx” or “the Company”) (NASDAQ: RARE) for violations of §§10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder by the U.S. Securities and Exchange Commission.

Investors who purchased the Company’s securities between August 3, 2023 and December 26, 2025, inclusive (the “Class Period”), are encouraged to contact the firm before April 6, 2026.

If you are a shareholder who suffered a loss, click here to participate.

We also encourage you to contact Brian Schall of the Schall Law Firm, 2049 Century Park East, Suite 2460, Los Angeles, CA 90067, at 310-301-3335, to discuss your rights free of charge. You can also reach us through the firm’s website at www.schallfirm.com, or by email at bschall@schallfirm.com.

The class, in this case, has not yet been certified, and until certification occurs, you are not represented by an attorney. If you choose to take no action, you can remain an absent class member.

According to the Complaint, the Company made false and misleading statements to the market. Ultragenyx gave investors a falsely optimistic impression of its understanding of the effects of its drug candidate on patients with Osteogenesis Imperfecta (“OI”). The Company’s failures were revealed by the Phase III ORBIT study in which it failed to achieve a statistically significant reduction in annualized fracture rate (“AFR”). Based on these facts, the Company’s public statements were false and materially misleading throughout the class period. When the market learned the truth about Ultragenyx, investors suffered damages.

Join the case to recover your losses.

The Schall Law Firm represents investors around the world and specializes in securities class action lawsuits and shareholder rights litigation.

This press release may be considered Attorney Advertising in some jurisdictions under the applicable law and rules of ethics.

Contacts

The Schall Law Firm
Brian Schall, Esq.
www.schallfirm.com
Office: 310-301-3335
info@schallfirm.com