Aspen Aerogels, Inc. (NYSE:ASPN – Get Free Report) saw a significant drop in short interest in May. As of May 15th, there was short interest totalling 4,500,000 shares, a drop of 8.9% from the April 30th total of 4,940,000 shares. Based on an average trading volume of 1,110,000 shares, the short-interest ratio is presently 4.1 […]