Schwab Mortgage-Backed Securities ETF (NYSEARCA:SMBS – Get Free Report) was the recipient of a large increase in short interest in May. As of May 29th, there was short interest totaling 541,518 shares, an increase of 8,587.9% from the May 14th total of 6,233 shares. Based on an average trading volume of 709,383 shares, the short-interest [...]