Brainstorm Cell Therapeutics Faces Rising Short Interest Brainstorm Cell Therapeutics Inc. experienced a 21.3% increase in short interest during February, with shares shorted rising from 91,400 to 110,900. The days-to-cover ratio stands at 1.4 days, based on average daily trading volume. Currently, 2.5% of the company’s stock is short sold, reflecting heightened market scrutiny.1