On January 28, 2020, the CAT NMS Plan Operating Committee approved parameters for when a CAT Reporter is required to self-report to the CAT Plan Processor, FINRA CAT, deviations of clock synchronizations standards required under SRO Rules and the CAT NMS Plan. FINRA CAT will use this information to evaluate the impact of the reported incident(s) on the quality of the CAT Data and to provide notice to the Regulatory Users of reported incident(s) that may impact their analysis of CAT Data. This alert provides information regarding the current clock synchronization standards, the thresholds requiring self-reporting of deviations of those standards and the reporting requirements. This obligation will be become effective upon the compliance enforcement date for Industry Member reporting.