MiFID II transaction reporting is a cornerstone of the FCA’s market abuse framework and a critical defense against the risks of market manipulation and insider dealing under the UK Market Abuse Regulation (MAR). As the UK transaction reporting regime evolves through PS26/15 and beyond, the importance of data quality increases. Accurate and complete transaction reporting is fundamental to the FCA’s ability to detect and investigate market abuse, and to a firm’s ability to demonstrate that it is managing these risks effectively.
Transaction Reporting as the Foundation of Market Abuse Surveillance
Under MAR, the FCA monitors markets to detect insider dealing, attempted manipulation such as spoofing, layering, wash trades and misuse of confidential information. Transaction reports are one of the primary datasets the FCA uses to perform this surveillance. Transaction reports provide regulators with the essential details of executed trades. They allow the FCA to reconstruct trading behavior across instruments, venues, counterparties over long time periods; identify patterns that may indicate abusive behavior; and link trading activity to the individuals involved. If this data is inaccurate or incomplete, the FCA’s ability to identify potential abuse is compromised.
The FCA has repeatedly stated that missing or inaccurate transaction reports raise the risk that market abuse could occur without detection.
Market Abuse Risk and Data Accuracy
Market manipulation is often identified through trading patterns rather than single trades. Activities such as spoofing, layering, marking the close or manipulating across markets depend on subtle behavioral signals across multiple transactions.
These patterns can be identified by reviewing transaction data such as sequencing, pricing behavior, volume anomalies and relationships between orders and executions. Errors in execution times, price fields, trading capacity or instrument reference data can distort these patterns and reduce the effectiveness of surveillance models.
Firms with weak transaction reporting controls risk unintentionally masking abusive behavior. If market abuse is later identified through other means, inaccurate reporting can be interpreted as a failure of systems and controls under both MiFID and MAR. The FCA views the transaction reports it receives as crucial to the work it does to combat financial crime, and it will take action against firms that demonstrate serious and sustained failures, The forthcoming reforms to the transaction reporting regime are designed to simplify reporting and improve data quality, but they do not reduce supervisory expectations. Throughout any transition period, firms remain fully subject to MAR obligations. Reforms remove complexity but not accountability.
Conclusion
Whilst the FCA recently announced in PS26/15 that it will reduce both the number of reporting fields and the scope of instruments subject to transaction reporting, resulting in a lower reporting burden for firms, this should not be interpreted as a sign that the transaction reporting regime is becoming less important. On the contrary, the FCA expects firms to enhance their data quality controls and surveillance capabilities, enabling more effective monitoring and stronger market oversight.
High quality transaction reporting enables regulators to detect insider dealing and market manipulation, and it enables firms to demonstrate that they are managing these risks effectively.
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