Why AC Immune Stock Is Crashing Today

Why AC Immune Stock Is Crashing Today

What happened Shares of the Swiss biotech AC Immune (NASDAQ: ACIU) lost over 42% of their value in pre-market trading Wednesday morning. The biotech's stock is crashing today in response to the news that its experimental Alzheimer's disease (AD) drug semorinemab failed to meet the primary endpoint of a midstage trial dubbed Tauriel.