X0306 4 2017-05-12 0 0001374310 CBOE Holdings, Inc. CBOE 0001463048 English Frank E. Jr. C/O CBOE HOLDINGS, INC. 400 SOUTH LASALLE STREET CHICAGO IL 60605 1 0 0 0 Common Stock 2017-05-12 4 S 0 400 84.33 D 4029 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $84.23 to $84.37. The reporting person undertakes to provide to CBOE Holdings, Inc., any security holder of CBOE Holdings, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range. /s/ Patrick Sexton, attorney-in-fact 2017-05-16