U.S. Options

Market for Underlying Security used for Openings on MIAX for Symbol BBH

Approved Rule Change—CBOE Margin Rule 12.3

Option Classes included in the MIAX Penny Pilot Program on January 5, 2016

Approved Rule Change—CBOE Margin Rules

Opening and Intra-day Quote Width Requirements for Certain Option Classes at MIAX Extended Through March 31, 2016

Fee Changes based upon implementation of Series 57 Securities Trader Qualification Exam and CE Program

Modified Option Holder Decision Time for Expiring Options on Thursday, December 24, 2015

Securities Trader Registration Categories and Qualification Exam for Proprietary Trading