This document contains guidance on using FIX standards (specifically the FIX Protocol and MMT) for transmitting and using post-trade transparency data in European securities. It is based on guidelines produced by the FIX Trading Community’s MiFID Transparency subgroup, last updated in May 2017 with new material covering regulatory changes in the EU and UK and greater detail on FIX Protocol field usage.

This document was updated in November 2025 to align with changes in regulatory requirements from both ESMA and the FCA.