US Stock Market Move | Treatment of genetic bone diseases in the research drug clinical trial failed, Ultragenyx Pharmaceutical (RARE.US) plunges over 42% in pre-market trading.

date
22:23 29/12/2025
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GMT Eight
As of the filing, the stock is down over 42%, trading at $19.69.
Before Monday's US stock market opening, Ultragenyx Pharmaceutical (RARE.US) stock price plummeted. As of press time, the stock has fallen more than 42% to $19.69. On the news front, the company announced that its investigational drug for treating a specific genetic bone disease did not meet the primary efficacy endpoint in late-stage clinical trials.