 Regeneron Pharmaceuticals Inc NASDAQ:REGN saw a large decrease in short interest in the month of July. As of July 31st, there was short interest totalling 1,990,000 shares, a decrease of 6.1 from the July 15th total of 2,120,000 shares. Approximately 1.9 of the companys stock are sold short. Based on an average daily volume of ... 