MIAX Options Exchange - Amendment To The PRIME™ Allocation For Certain Initiating Side Orders Increased From 40% To 50%, Effective May 20, 2015

MIAX has filed for immediate effectiveness to amend Exchange Rule 515A,  MIAX Price Improvement Mechanism (“PRIME”), to increase the trade allocation entitlement of a Member that initiates a PRIME auction (an “Initiating Member”) from 40% to 50% when only one competing participant matches such Initiating Member’s auto-match submission at the final price level.

Please refer to MIAX Regulatory Circular, MIAX_RC_2015_27, for more details.