X0306 4 2017-05-12 0 0001374310 CBOE Holdings, Inc. CBOE 0001163949 RATTERMAN JOSEPH P C/O CBOE HOLDINGS, INC. 400 SOUTH LASALLE STREET CHICAGO IL 60605 1 0 0 0 Common Stock 2017-05-12 4 S 0 175955 84.06 D 55738 I See footnote Common Stock 10990 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $83.89 to $84.43. 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. Shares are held of record by Joseph P. Ratterman and Sandra M. Ratterman, as Trustess of the Joseph P. and Sandra M. Ratterman Trust dated September 15, 2008 or their successors in Trust. Mr. Ratterman disclaims beneficial ownership of the reported securities, except to the extent of his pecuniary interests therein. /s/ Patrick Sexton, attorney-in-fact 2017-05-16