Massive Short Interest Surge in STF Tactical Growth ETF (TUG) The STF Tactical Growth ETF (NASDAQ:TUG) experienced a staggering 4,200% increase in short interest in February, climbing from 200 shares to 8,600 shares by month-end. This surge reflects heightened market activity, with the ETF's days-to-cover ratio currently at 0.5 days, based on an average daily volume of 16,000 shares.1