Allot Communications Ltd (NASDAQ:ALLT) was the target of a large growth in short interest in November. As of November 15th, there was short interest totalling 422,200 shares, a growth of 187.2% from the October 31st total of 147,000 shares. Based on an average daily volume of 168,300 shares, the days-to-cover ratio is currently 2.5 days. Currently, 1.3% of the shares of the stock are short sold.