EP086 – Halt Reasons

This proposal addresses the need for marketplaces to add halt reasons rapidly as regulatory requirements change. HaltReason(327) originally used the char datatype and a closed set of predefined character values, which did not support user-defined extensions.

The proposal changes HaltReason from char to int, maps the six existing character meanings to numeric values 0 through 5, and permits values following the Reserved100Plus pattern. It identifies Security Status, Market Data Snapshot Full Refresh and Market Data Incremental Refresh as the three affected messages.