🔴 Ultragenyx is trading 43% down in after-hours trading

Ultragenyx is trading 42.82% down at $15.17 after-hours on September 2, 2026, versus the regular-session close; the catalyst remains unclear.

• No credible September 2 company-specific catalyst was identified. The latest company release located, dated September 1, announced publication of 96-week GENGLYCOS trial data rather than an adverse development.
• The broader market was positive, so index-wide sentiment does not clearly explain the sharp move. Recheck for delayed news or filing updates.