Mystery Solved: Days Like This Are What the VIX Warned About

  • Nasdaq 100 fear gauge rose to highest versus VIX in 16 years
  • ‘That’s rarely sustainable’: Interactive Brokers’ Sosnick
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Traders professing bafflement over recent ominous moves in volatility indexes got some clarity on Thursday.

The situation -- the VIX’s persistent and unusual advance in tandem with the S&P 500 -- was thought unsustainable. On Thursday, it came asunder, as the biggest selloff in four months swept through U.S. equities, particularly tech stocks.