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Ultragenyx faces securities fraud probe after Phase 3 trial failure causes stock to plunge 44%.

Market News
17 Sep 2026
PRNewsWire
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Bearish
Ultragenyx faces securities fraud probe after Phase 3 trial failure causes stock to plunge 44%.

Ultragenyx Pharmaceutical is under investigation by Pomerantz LLP for potential securities fraud following the company's announcement that its Phase 3 Aspire study for apazunersen in Angelman syndrome failed to meet primary and key secondary endpoints. This news led to a sharp 44.03% drop in Ultragenyx's stock price. The investigation aims to determine if Ultragenyx and its officers engaged in unlawful business practices. Investors affected by the stock decline are encouraged to contact Pomerantz LLP for possible class action participation.

Ultragenyx Pharmaceutical is the subject of an investigation following its recent clinical trial results. For readers following the Health sector, here is Pluang's market snapshot as of Sep 17, 2026 21:11 WIB: out of 91 priced US Health stocks, 59 rose and 31 fell. Notable moves include CTXR at USD 0.58 with a 4.20% increase and 100% buy order activity, XRAY at USD 9.77 down 3.65%, and ASND at USD 238.79 down 3.59% with 91% sell order activity.

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