US stock futures up, Nasdaq 100 gains 1%. Biohaven (BHVN) shares down after BofA downgrade and enrollment of first patient in phase 3 trial.

US stock futures up, Nasdaq 100 gains 1%. Biohaven (BHVN) shares down after BofA downgrade and enrollment of first patient in phase 3 trial.

Biohaven (BHVN) shares fall as BofA downgrades the stock to Underperform, citing a risky profile ahead of key epilepsy trial data.