CBOE Holdings Reports May 2016 Trading Volume - Total Index Options ADV Up 8% From May 2015 - VIX Futures ADV Up 31% From May 2015 - SPX Options ADV Up 13% From May 2015

CBOE Holdings, Inc. (NASDAQ: CBOE) reported today that May average daily volume (ADV) for options contracts traded on Chicago Board Options Exchange® (CBOE®) and C2 Options Exchange (C2), and futures contracts traded on CBOE Futures Exchange (CFE®) was 4.3 million contracts, an increase of 2 percent from April 2016 and relatively unchanged from May 2015.