BHVN regulatory event: a negative outcome, -14.7%

On September 10, 2026, Biohaven Pharmaceutical Holding Company Ltd. reached its regulatory event. The result was a negative outcome, and the stock moved -14.7% in the window around the event. It had already run +8.3% in the 30 days into the catalyst — the kind of pre-event run-up that often precedes binary readouts.