This tech 'fear gauge' is nearing a two-decade high. Investors should worry.

By Frances Yue and Joy Wiltermuth

Wall Street's main 'fear gauge,' the VIX, might not be the best way to track this volatility in stocks

Wall Street's traditional "fear gauge," the VIX, may no longer be the best way to track volatility in stocks.

Wall Street's traditional "fear gauge" might not be the best barometer for this selloff.

A new wave of turbulence swept up U.S. stocks on Tuesday as options traders grew more skittish about the year's big winners of the rally: megacap tech and artificial intelligence stocks.