With a 349% increase in stock price since its June debut on U.S. markets, Boston-based Karuna Therapeutics Inc. secures the title of best IPO performer so far in 2019. The stock skyrocketed in November following positive top-line phase II data of Karxt in acute psychosis in patients with schizophrenia, providing a potential read-through to larger indications such as Alzheimer’s disease and pain.