National Bank of Canada (OTCMKTS:NTIOF - Get Rating) was the target of a significant drop in short interest in the month of October. As of October 31st, there was short interest totalling 6,221,600 shares, a drop of 42.3% from the October 15th total of 10,779,200 shares. Based on an average trading volume of 11,700 shares, the days-to-cover ratio is currently 531.8 days.