Short Interest in XFIX Surges Over 3,600% The F/m Opportunistic Income ETF (XFIX) witnessed a dramatic 3,677.1% increase in short interest in February, reaching 181,300 shares. This sharp rise suggests heightened bearish sentiment. With 27.1% of shares shorted, the days-to-cover ratio now stands at 129.5 days, reflecting significant market skepticism around the ETF's performance.1