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The success of apazunersen in a Phase 3 trial for Angelman syndrome was a key driver of Ultragenyx’s value, according to William Blair, and the asset’s failure robs the biotech of any meaningful near-term milestones.

Novo plans to hit $23B in revenue by 2035, has further reduced its workforce by 4,000 and is boosting manufacturing capacity for its Wegovy pill, but investors are unconvinced it will be enough to turn things around; Viking Therapeutics and Roche report positive results for their weight loss assets; Ultragenyx snags FDA approval for its Sanfilippo syndrome gene therapy; IPOs keep on coming.

The recent FDA approval of Fayuvi for a rare, childhood neurodegenerative disease was “particularly special” for Ultragenyx CEO Emil Kakkis. It could also, along with an August nod for another gene therapy, help offset recent challenges brought on by two asset failures.

The market approval for Fayuvi, which was rejected in 2025 due to manufacturing problems, comes shortly after Ultragenyx got the FDA nod for its first gene therapy last month.

The accelerated greenlight for Ultragenyx’s gene therapy for glycogen storage disease has raised analyst expectations for approval of UX111, which the FDA rejected last summer and is currently reviewing for a second time. A decision is expected by mid-September.

The FDA in July last year declined to approve UX111 for Sanfilippo syndrome, a rare neurodegenerative disorder, citing manufacturing issues. Ultragenyx Pharmaceutical resubmitted its application ten days ago, expecting a six month review time.