 International Bancshares Corp NASDAQ:IBOC was the target of a significant growth in short interest in April. As of April 15th, there was short interest totalling 997,400 shares, a growth of 15.7 from the March 31st total of 862,100 shares. Based on an average daily volume of 334,900 shares, the days-to-cover ratio is currently 3.0 days. ... 