The CBOE Volatility Index (VIX), the SPX option derived measure of implied volatility, fell 0.12 today to close at 9.90, while the underlying SPX index gained 0.77 to close at $2439.07, a 0.03% increase. 630,909 VIX option contracts traded, 1.1970x the typical daily volume for the product. Calls made up 80.4% of the volume
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