Beginning in Phase 2c (equities) and Phase 2d (options), the party that is holding the order at the time the order or all underlying conditions are met (such that the order becomes and remains effective until it is fully executed or cancelled) has the obligation to report to CAT the Order Effective event or Option Order Effective event (MEOE or MOOE). Refer to the Industry Member Reporting Scenarios document for additional information.

Additionally, beginning December 5, 2022, the Multi-Leg Order Effective event (MLOE) is required to be reported to indicate that a multi-leg order, or an underlying condition of a multi-leg order, has become effective.

See also:  

•    See FAQ B57 regarding how the orderType and handlingInstructions fields must be populated for Stop, Stop Limit, Stop on Quote, Stop Limit on Quote, Trailing Stop, and Trailing Stop Limit orders.  
•    See FAQ B59 for information related to the reporting requirements when a Stop, Stop Limit, Stop on Quote, or Stop Limit on Quote order is triggered.
•    See FAQ B62 for information related to the reporting requirements for Trailing Stop and Trailing Stop Limit orders.
•    See FAQ B67 for information related to Stop orders when the exact stop price is unknown because it is either based on an underlying condition or will be determined by the destination venue.