Decline in Short Interest for First Trust Small Cap Core AlphaDEX Fund The First Trust Small Cap Core AlphaDEX Fund (NASDAQ:FYX) experienced a 91.7% drop in short interest in February, with shares falling from 12,000 to 1,000. This sharp decline reflects low short-selling activity. The fund's trading volume averages 25,900 shares, resulting in a minimal short-interest ratio of 0.0 days.12