Groupon, Inc. (NASDAQ:GRPN) saw a significant decline in short interest during the month of May. As of May 15th, there was short interest totalling 37,505,936 shares, a decline of 23.5% from the April 28th total of 49,000,575 shares. Based on an average daily trading volume, of 11,003,243 shares, the short-interest ratio is presently 3.4 days. Approximately 9.1% of the company’s stock are short sold.