Every investment firm operating in the UK must comply with FCA transaction reporting obligations. These requirements exist to protect market integrity, deter financial crime, and give the Financial Conduct Authority the data it needs to monitor trading activity across UK financial markets. Getting it wrong can result in regulatory fines, reputational damage, and in serious cases, restrictions on a firm’s ability to trade.
This guide explains what FCA transaction reporting involves, who it applies to, what data must be submitted, and how to stay compliant, while also discussing the role of the LEI in the reporting process.
What Is FCA Transaction Reporting?
FCA transaction reporting is the obligation for UK investment firms to submit detailed information about their executed transactions to the FCA. These reports are submitted under Article 26 of UK MiFIR (the Markets in Financial Instruments Regulation), which requires firms to provide complete and accurate details of each reportable transaction no later than the close of the following working day (T+1).
The reports are submitted either directly to the FCA’s Market Data Processor (MDP) or through an Approved Reporting Mechanism (ARM). They include information about the financial instrument traded, the price, the parties involved, and the individuals who made the trading decisions.
Transaction reports are not made public. They are regulatory submissions used exclusively by the FCA and other competent authorities for surveillance and enforcement purposes.
Why Does the FCA Require Transaction Reporting?
The FCA requires transaction reporting to fulfil several core regulatory objectives:
- Detecting market abuse. Transaction data allows the FCA to identify suspicious trading patterns, insider dealing, and market manipulation in real time.
- Supporting data-led supervision. The FCA operates as a data-led regulator. Transaction reports are one of its most important surveillance inputs.
- Enabling cross-border cooperation. The data supports information-sharing with other regulators and contributes to the Bank of England’s supervisory work.
- Deterring financial crime. When firms fail to report, or submit inaccurate data, potential market abuse can go undetected. Recent enforcement actions have directly targeted this risk.
Key FCA Transaction Reporting Requirements
FCA transaction reporting requirements are set out in Article 26 of UK MiFIR, supplemented by the technical standards in RTS 22 (Commission Delegated Regulation (EU) 2017/590, as onshored into UK law). Below is what firms need to know.
Who Is Subject to the Reporting Rules?
The reporting obligation applies to UK-authorised investment firms that execute transactions in reportable financial instruments. This includes firms providing services such as reception and transmission of orders, execution of orders on behalf of clients, dealing on own account, and portfolio management.
Trading venues are also required to submit transaction reports on behalf of non-MiFID members executing through their systems.
It is important to note that the obligation applies regardless of whether the transaction takes place on a trading venue or over-the-counter (OTC). UK investment firms must determine whether each instrument they trade is reportable and ensure the appropriate reporting infrastructure is in place.
What Data Needs to Be Submitted?
Each transaction report must contain up to 65 data fields, as specified in Annex I of RTS 22. This is a substantial increase from the 13 fields required under the earlier MiFID I regime and reflects the FCA’s demand for greater market transparency.
The required data fields cover the following categories:
- ✅ Transaction identifiers including a unique transaction reference number and execution timestamp
- ✅ Instrument identification typically via ISIN
- ✅ Buyer and seller details using LEIs for legal entities and national identifiers for natural persons
- ✅ Price and quantity of the transaction
- ✅ Decision-maker identification covering the person or algorithm responsible for the investment decision and execution
- ✅ Short-selling indicators where applicable
Every field must be completed accurately. The FCA’s Markets Reporting Team (MRT) actively monitors data quality and will raise concerns with firms where errors or gaps are identified.
The “No LEI, No Trade” Rule: Why You Need an Active LEI
One of the most operationally significant requirements is the mandatory use of a Legal Entity Identifier. If you are unfamiliar with what an LEI number is, it is important to know that under UK MiFIR, the buyer and seller in a transaction must be identified using one. If a legal entity does not have an active LEI, its counterparty cannot include it in a compliant transaction report.
This is the origin of the so-called “No LEI, No Trade” principle. In practice, it means that brokers, trading venues, and investment firms will refuse to execute a transaction on behalf of a legal entity client that does not hold a current, active LEI.
An LEI that has not been renewed will generally carry the registration status ‘LAPSED’. That means its reference data is overdue for renewal. Firms should check whether their reporting and execution arrangements require a currently renewed LEI before trading.
Ensuring your LEI remains active is one of the simplest and most effective steps a company can take to avoid unnecessary disruption to its trading and reporting processes. Updating your LEI before expiry eliminates this risk entirely.
The Impact of MiFID II on FCA Transaction Reporting
The current FCA transaction reporting regime has its roots in MiFID II, the second Markets in Financial Instruments Directive, which took effect across the EU (including the UK) on 3 January 2018. MiFID II and its accompanying regulation, MiFIR, fundamentally expanded the scope and detail of transaction reporting compared to the original MiFID I framework.
Under FCA transaction reporting MiFID II rules, the number of reportable data fields increased from 13 to 65, the range of reportable instruments broadened significantly to include derivatives and instruments traded on OTFs (Organised Trading Facilities), and the requirement to identify natural persons involved in investment decisions was introduced for the first time.
These changes were a direct response to weaknesses exposed during the 2008 financial crisis, where regulators lacked sufficient data to understand counterparty exposures and detect abusive trading practices.
How UK MiFIR Carries on the MiFID II Legacy
Following Brexit, the UK onshored MiFID II and MiFIR into domestic law. The UK now operates under “UK MiFIR,” which is substantively similar to the EU version but subject to independent UK amendments over time.
The FCA retains full authority over transaction reporting in the UK. Reports are submitted to the FCA (not to ESMA, the EU’s securities regulator), and the UK maintains its own register of ARMs and its own Market Data Processor infrastructure.
It is worth noting that the FCA published a Discussion Paper in November 2024 titled “Improving the UK transaction reporting regime,” which proposed changes including reducing the number of reportable fields, shortening the back-reporting period, and potentially removing certain instrument types from scope. A policy statement is expected in mid-2026. Firms should monitor these developments closely, as they may materially change the reporting landscape.
FCA and EU Transaction Reporting: Navigating the Differences
For firms operating across both UK and EU jurisdictions, understanding the differences between the FCA and EU transaction reporting regimes is essential.
Post-Brexit Changes and Dual Reporting Obligations
Since 1 January 2021, the UK and EU have operated separate transaction reporting frameworks. While both are derived from MiFIR Article 26, they are now diverging as each jurisdiction pursues its own regulatory priorities.
Key differences and obligations to be aware of:
- Separate submission channels. UK reports go to the FCA via UK-authorised ARMs. EU reports go to the relevant national competent authority (NCA) and ultimately to ESMA.
- Diverging regulatory reviews. The EU’s MiFIR review (Regulation (EU) 2024/791) entered into force in March 2024 and introduces changes to OTC derivatives reporting scope, though existing RTS 22 rules continue to apply until revised delegated acts are adopted. The UK is pursuing its own parallel review.
- Mandatory independent reporting for UK branches. The FCA has made clear that a UK branch of an EU firm cannot discharge its UK reporting obligations by transmitting orders to the parent entity. The UK branch must report independently to the FCA.
- Dual reporting is typically required. Firms with both a UK head office and EU branch operations (or vice versa) generally need to submit reports to both the FCA and the relevant EU NCA, with the correct data fields and identifiers for each regime.
This dual obligation increases operational complexity and cost. Firms affected should ensure their reporting systems can handle submissions to both jurisdictions. Firms with complex cross-border structures may also need to consider their EMIR reporting obligations, which operate under a separate but related regulatory framework.
FCA Transaction Reporting Fines and Common Pitfalls
The FCA has demonstrated a clear willingness to take enforcement action against firms that fail to meet their transaction reporting obligations. The penalties outlined below illustrate the regulator’s approach.
High-Profile Regulatory Fines for Reporting Failures
| Infinox Capital Limited | Sigma Broking Limited | |
| Date | January 2025 | August 2025 |
| Fine | £99,200 | £1,087,300 |
| Breach | Failed to submit 46,053 transaction reports for single-stock CFD trades over five months | Submitted approximately 924,584 incorrect reports (close to 100% of transactions) over five years |
| Root cause | New business line launched without adequate reporting controls | Incorrect system setup that persisted uncorrected due to weak internal controls |
| Aggravating factors | Did not self-report the breach; FCA identified it through its own monitoring. Deterrence multiplier of 7x applied | Second enforcement action for similar failures (previously fined £531,600 in October 2022) |
| Significance | First enforcement action under UK MiFIR for transaction reporting failures | Demonstrates escalating penalties for repeat offenders |
These cases demonstrate two things: the FCA is actively monitoring data quality, and repeat offenders face escalating penalties.
Top Reasons Firms Fail FCA Audits
Based on FCA guidance (including its Market Watch newsletters) and enforcement outcomes, the most common reasons firms fail to meet transaction reporting requirements include:
- Incorrect system configurations: Often occurring when launching new products, trading venues, or business lines.
- Failure to identify reportable instruments: Inaccurately determining which financial instruments fall under reporting scopes.
- Weak or absent reconciliation processes: Failing to properly check internal trade records against the reports actually submitted to the regulator.
- Missing or expired LEIs: Transacting with counterparties that do not have a valid, active Legal Entity Identifier.
- Delayed breach notifications: Failing to notify the FCA promptly when reporting errors or system failures are discovered.
- Over-reliance on key individuals: Depending on a single person to manage the entire reporting process without adequate oversight, cross-training, or controls.
The FCA’s Bottom Line: The regulator has been explicit that well-written compliance policies alone are not sufficient. Firms are expected to demonstrate that their systems and controls are consistently effective in practice.
How to Ensure Flawless Transaction Reporting Compliance
Meeting FCA transaction reporting requirements is an ongoing operational commitment, not a one-off project. The following steps form the foundation of a robust compliance framework.
1. Obtain and Maintain Your Legal Entity Identifier (LEI)
An active LEI is a non-negotiable prerequisite for transaction reporting. Without one, your firm cannot be identified in a compliant report, and your counterparties may refuse to execute trades on your behalf.
If your firm does not yet have an LEI, get your LEI now to ensure you can meet reporting obligations from day one. If you already hold an LEI, ensure it is updated before expiry. At LEI 24, multi-year registration options are available to reduce the administrative burden and eliminate the risk of accidental lapse.
2. Implement Automated Reporting and Data Reconciliation
Manual reporting processes are a significant source of errors. Firms should use automated systems that integrate with their trading platforms to generate transaction reports in the correct format (as specified in RTS 22) and submit them via an ARM within the T+1 deadline.
Equally important is regular reconciliation: comparing submitted reports against internal trade records to identify discrepancies before the FCA does. The Infinox and Sigma cases both highlight what happens when reconciliation processes are absent or inadequate.
3. Conduct Regular Quality Assurance Checks
The FCA publishes guidance through its Market Watch newsletters on common data quality issues it has identified across the industry. Firms should review these publications regularly and test their own reporting output against the issues raised.
Quality assurance should also include verifying that the correct LEIs, ISINs, and national identifiers are being used, that timestamps are accurate, and that any new products or business lines have been assessed for reportability before trading begins.
Simplify Your FCA Reporting with a Valid LEI
Many of the compliance risks described in this guide can be avoided by ensuring your firm and your counterparties hold valid, active LEIs. An expired or missing LEI is one of the most common, and most preventable, causes of reporting failures.
LEI 24 is a Registration Agent working with Nasdaq CSD, a GLEIF-accredited LEI Issuer. We offer fast LEI registration (typically within 1 to 2 hours for UK entities), competitive multi-year pricing, and automated renewal protection so your LEI never lapses unexpectedly.
Whether you need a new LEI or a free transfer from another provider, the process takes minutes.
Final Thoughts: Staying Ahead of FCA Transaction Reporting
FCA transaction reporting is not an area where firms can afford to be reactive. The regulator is actively monitoring data quality, resolving enforcement cases faster than ever, and has signalled through its 2025 enforcement actions that it will use financial penalties to deter non-compliance.
The fundamentals remain straightforward: know which instruments are reportable, ensure your systems capture and submit accurate data within the T+1 deadline, maintain an active LEI, and reconcile your reports regularly. Firms that treat transaction reporting as an integral part of their operations, rather than an afterthought, will be well-positioned to avoid regulatory scrutiny.
With potential changes to the UK transaction reporting regime expected in 2026, now is a good time to review your current processes and ensure they are fit for purpose.
Frequently Asked Questions (FAQs)
What is the difference between transaction reporting and trade reporting?
Transaction reporting is a confidential submission to the FCA under UK MiFIR Article 26 for market surveillance. Trade reporting refers to post-trade public transparency obligations under MiFIR Articles 20 and 21. They serve different purposes.
Can I submit a transaction report to the FCA with an expired LEI?
A lapsed LEI does not meet UK MiFIR identification requirements. Counterparties and brokers will typically refuse to execute trades for entities without an active LEI, so the issue often prevents the transaction entirely.
Who is ultimately responsible for transaction reporting under UK MiFIR?
The executing investment firm. Reporting can be delegated to an ARM or trading venue, but legal responsibility for completeness and accuracy remains with the firm that executed the transaction.
How long do firms need to retain their transaction reporting records?
A minimum of five years under UK MiFID II rules (SYSC 10A). The FCA can extend this to seven years. Back-reported transactions with a trade date more than five years old will not be accepted.
Do dual-regulated firms need to report to both the FCA and ESMA?
Yes, where applicable. UK-authorised firms report to the FCA. EU branches or entities report to their relevant NCA under EU MiFIR. The two regimes are separate and one submission does not satisfy the other.
