The CAT Technical Specifications for Industry Members require Industry Members operating ATSs (“Industry Member ATSs”) to populate the atsOrderType field on CAT Equity New Order and Order Accepted events. The description of this field states that it “Shows the ATS-specific order type as selected from a list of order types defined by this Industry Member via the Reporter Portal.” The purpose of this CAT Alert is to provide additional information regarding the mechanism that CAT will use to collect information regarding these order types. CAT will provide an ATS Order Type Entry Screen on the CAT Reporter Portal that will enable Industry Member ATSs to register ATS Order Types with CAT. Industry Member ATSs are required to register these ATS Order Types with CAT at least 20 days prior to the Order Type becoming effective.