Proposed Rule Change Relating to Reporting and Market Participant Identifier Requirements for Alternative Trading Systems

Financial Industry Regulatory Authority, Inc. ("FINRA") is filing with the Securities and Exchange Commission ("SEC" or "Commission") a proposed rule change to amend FINRA Rules 4552, 6160, 6170, 6480, and 6720 to revise the reporting and market participant identifier ("MPID") requirements applicable to alternative trading systems ("ATSs").