Proposed Rule Change to Amend Rule 6191 to Implement an Anonymous, Grouped Masking Methodology for Over-the-Counter Activity in Connection with Website Data Publication of Appendix B Data Pursuant to the Regulation NMS Plan to Implement a Tick Size Pilot Program

Financial Industry Regulatory Authority, Inc. (“FINRA”) is filing with the Securities and Exchange Commission (“SEC” or “Commission”) a proposed rule change to amend Rule 6191 to implement an anonymous, grouped masking methodology for over-the-counter (“OTC”) activity in connection with website data publication of Appendix B data pursuant to the Regulation NMS Plan to Implement a Tick Size Pilot Program (“Plan”).