What does this guide cover?

This guide highlights the most common MiFID II transaction reporting error codes for 2026, explaining what each code means, why it occurs, and how firms can resolve and prevent it.

Who is this guide aimed at?

It’s designed for compliance professionals, operations teams, and reporting specialists responsible for MiFID II transaction reporting, as well as firms looking to reduce rejection rates and improve data quality.

How can this guide help reduce reporting errors?

By breaking down the root causes behind frequent error codes and outlining practical fixes, the guide helps firms identify weaknesses in their reporting processes and implement more effective controls.

Is this guide suitable for both technical and non-technical users?

Yes, the guide is written to be accessible for both technical teams handling reporting systems and non-technical stakeholders who need to understand the implications of errors and ensure compliance.

Guides

Top 5 MiFID II Transaction Reporting Errors (FCA Data 2018-2025)

Published: 23rd April 2026

Download our free MiFID II Transaction Reporting Top Error Codes guide to discover:

The top five MiFID II transaction reporting error codes (2018-2025) based on FCA data
Why these errors occur and how to avoid or mitigate them effectively
Practical insights into free transaction reporting tools that can help improve data quality and reduce regulatory risk

Qomply’s Regulatory Reporting Hub combines regulatory expertise with AI, automation and data analytics to deliver scalable, audit-ready reporting intelligence that reduces errors, lowers remediation costs, and minimises operational and regulatory risk.

Covering regimes including MiFIR, EMIR Refit, SFTR, CFTC, CSA, MAS, ASIC and HKMA, Qomply also offers a fully managed service and operates globally from London.

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Frequently asked questions

This guide highlights the most common MiFID II transaction reporting error codes for 2026, explaining what each code means, why it occurs, and how firms can resolve and prevent it.
It’s designed for compliance professionals, operations teams, and reporting specialists responsible for MiFID II transaction reporting, as well as firms looking to reduce rejection rates and improve data quality.
By breaking down the root causes behind frequent error codes and outlining practical fixes, the guide helps firms identify weaknesses in their reporting processes and implement more effective controls.
Yes, the guide is written to be accessible for both technical teams handling reporting systems and non-technical stakeholders who need to understand the implications of errors and ensure compliance.