The CBOE Volatility Index jumped Friday to levels not seen since January, and was on track for its largest ever weekly percentage jump as a broad selloff in stocks continued for a fourth straight session. The VIX, or so called "fear index," surged more than 25% to 23.97. For the week, the index is up nearly 87%, making it the largest weekly percentage jump in the VIX, according to FactSet data. The previous largest was back in early May 2010, when the VIX jumped nearly 86% on the week. On Friday, the Dow Jones Industrial Average and S&P 500 Index were on track for weekly declines of more than 4%, and the Nasdaq Composite Index was on track for a weekly decline of more than 5%.
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