CBOE Holdings (CBOE) implied volatility increases as shares pull back

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CBOE HLDGS (NYSE: CBOE) Delayed: 249.10 --0 (-0%)
Previous Close $249.10    52 Week High $72.53 
Open $249.10    52 Week Low $58.43 
Day High $249.10    P/E 125.18 
Day Low $249.10    EPS $1.99 
Volume 1,613