Gentex Corporation (NASDAQ:GNTX - Get Free Report) was the target of a significant growth in short interest during the month of March. As of March 31st, there was short interest totaling 10,341,203 shares, a growth of 19.1% from the March 15th total of 8,684,416 shares. Based on an average daily volume of 2,186,312 shares, the days-to-cover ratio is presently 4.7 days. Currently, 4.8% of the shares of the stock are short sold.