FCA Market Watch on Transaction Reporting: Persistent Themes for 2026

FCA Market Watch is the most direct ongoing source of FCA supervisory commentary on UK transaction reporting. We look at the persistent themes the FCA has emphasised through 2024 and 2025, including LEI quality, instrument identification, timing, internal consistency, and reconciliation discipline, and what they imply for reporting firms working through 2026.

At LEI International Private Limited (TNV-LEI), our role is to support UK reporting firms and counterparty entities with LEI issuance, LEI renewal, LEI transfer, LEI verification, and lifecycle management where LEIs appear in transaction reporting workflows.

This detailed guide explains:

• What FCA Market Watch is and why it matters

• Why LEI quality remains a persistent transaction reporting theme

• How instrument identification edge cases affect reporting accuracy

• Why timing and completeness controls remain important

• How internal consistency across fields is being reviewed

• Why reconciliation discipline has become sharper post-REFIT

• What practical action points reporting firms should consider for 2026

• How TNV-LEI helps UK reporting firms and counterparty entities manage LEIs

What is FCA Market Watch and Why It Matters

FCA Market Watch is the Financial Conduct Authority’s ongoing supervisory newsletter on market conduct and reporting. Each issue addresses specific themes the FCA observes across UK supervised firms, sometimes describing patterns of weakness, sometimes highlighting examples of good practice, sometimes flagging upcoming changes. The newsletter is freely available on the FCA’s website.

For UK compliance and operations teams responsible for transaction reporting under FCA SUP 17A, Market Watch is one of the most useful single ongoing sources of supervisory expectation. Reading the newsletter alongside the underlying SUP 17A rules and UK RTS 22 technical standard provides the practical picture of what the FCA expects in current reporting practice.

Through 2024 and 2025, five themes have recurred in the FCA’s published commentary on transaction reporting. Each is worth dissecting separately because each implies different action by reporting firms. Some are familiar pre-REFIT themes that remain operationally significant; others have emerged or sharpened since the REFIT changes of September 2024.

Theme 1: LEI Quality Across the Counterparty Chain

The single most-discussed data quality theme remains LEI quality. The FCA has consistently highlighted issues with LEIs appearing in transaction reports, not just the executing-firm LEI, but counterparty LEIs, beneficial-owner LEIs and decision-maker LEIs.

Four sub-patterns recur in the FCA’s commentary:

• Lapsed counterparty LEIs: where the counterparty’s LEI is no longer in Issued status. The lapsed-LEI position under UK reporting rules applicable from 30 September 2024 means certain reporting fields require an active status. UK entities should maintain an active LEI to avoid reporting rejection or transaction delay.

• LEI mismatch with public registry: where the LEI reference data has drifted from the entity’s current Companies House or equivalent record. Address changes, name changes and director updates that are reflected at Companies House but not in the GLEIF Global LEI Index.

• Group-level LEI reuse: where the parent group’s LEI is reported in fields that should carry the specific operating subsidiary’s LEI. The two are separate legal entities with separate LEIs; reuse causes systemic risk aggregation errors at the FCA end.

• Use of natural-person identifiers where an LEI should be used: for example, in the decision-maker field where the decision-maker is in fact a legal-entity portfolio manager rather than a natural person. The LEI system identifies legal entities; natural-person identifiers are used only where the decision-maker is genuinely an individual.

Reporting firms have invested in pre-submission LEI validation infrastructure during 2024 and 2025 to address these patterns. The discipline is now widely implemented but the underlying counterparty hygiene, ensuring counterparties keep their own LEIs current, remains an ongoing operational theme.

Theme 2: Instrument Identification Edge Cases

Instrument identification is the second consistent theme. The FCA observes recurring issues with ISIN reporting, particularly in OTC derivatives and bespoke instruments where the ISIN universe is more complex than for listed equity.

Three sub-patterns recur:

• Missing or invalid ISINs: where the report contains no ISIN where one should appear, or contains an ISIN that does not validate against the ANNA Service Bureau or equivalent reference data sources. Often these reflect reporting on bespoke or recently issued instruments where ISIN allocation has not yet propagated to the firm’s internal reference data.

• Stale or superseded ISINs: where an ISIN is used that has been retired or replaced. Corporate events, including mergers, spin-offs and share consolidations, can change ISINs; firms whose reference data has not refreshed report against stale identifiers.

• Inconsistency between ISIN and other instrument fields: where the ISIN reported and the instrument-attribute fields, including CFI code, notional amount and underlying, contradict each other. This indicates internal data integration issues at the reporting firm rather than external reference data issues.

Unlike LEI quality, where the fix is largely about counterparty hygiene and validation, instrument identification fixes typically involve the firm’s own internal data integration. ARMs and internal trade enrichment systems can validate and enrich ISINs, but the underlying source-data discipline remains the firm’s responsibility.

Theme 3: Timing and Completeness

The T+1 reporting standard, transactions executed on day T must be reported by close of business on day T+1, remains the timing baseline. The FCA observes two persistent sub-themes here.

• Late submissions: where reports arrive after the T+1 deadline. The FCA receiving system accepts late reports but generates supervisory awareness, particularly where the lateness pattern is systematic rather than occasional. Causes range from operational incidents, such as system outages and missed cut-offs, to underlying process design, such as manual exception handling on T+1 morning that is not robust.

• Missed reports: where transactions occur but no report is submitted. The harder failure mode is not visible to the firm at the point of report submission, but visible to the FCA through cross-referencing trading venue data, settlement data and the absence of expected reports. Firms with mature reporting infrastructure run their own completeness reconciliation, comparing executed trades against submitted reports.

Both sub-themes have improved through 2025 as REFIT-era process discipline has matured, but neither has disappeared. The FCA expects firms to have explicit completeness controls covering both the timing and the population dimensions, not just “we submitted what our system generated” but “we verified that what our system generated matches what should have been generated”.

Theme 4: Internal Consistency Across Fields

REFIT’s expanded field set has surfaced internal consistency issues that the legacy format hid. The FCA has emphasised that reports must not only have valid individual fields but must also be internally consistent across fields.

Examples that recur in the FCA commentary include:

• Executing entity, decision-maker and beneficial owner fields that imply contradictory entity relationships

• Trade time and reporting time that are inconsistent with the venue, instrument or counterparty

• Principal-side and agent-side identification that points to mismatched entities

• Counterparty country fields that do not align with the counterparty LEI’s jurisdiction in the GLEIF reference data

Each of these reflects the same underlying issue, the reporting system assembles a report from multiple data sources without applying cross-field consistency checks. Firms have responded by building consistency validation layers, either as part of internal pre-submission validation or through ARM-provided validation. The maturity of these layers has improved through 2025 but the underlying discipline is an ongoing area of supervisory focus.

Theme 5: The Reconciliation Discipline

Reconciliation discipline has emerged as a sharper theme post-REFIT. Where the original UK MiFIR transaction reporting was a single-sided submission, the executing firm reports, REFIT-era derivative reporting under UK EMIR REFIT is bilateral, both counterparties to a derivative report, with TR-side matching identifying mismatches.

The reconciliation discipline applies in three layers:

• Pre-submission consistency: the firm checks its own reports for internal consistency before submission, as discussed in theme 4.

• TR-side matching feedback: the Trade Repository matches paired reports and flags mismatches between counterparties’ versions of the same trade. Firms respond to mismatch reports promptly, investigating whose data is correct and resubmitting where needed.

• Multi-source reconciliation: between the firm’s reports, the firm’s trade-confirmation records, the counterparty’s confirmation records, settlement data, and venue data. Mature reporting operations now run weekly or monthly reconciliation cycles across all of these sources.

Although derivative reporting under UK EMIR REFIT and UK SFTR is structurally bilateral, the discipline of treating reporting data as something to be actively reconciled has carried across to single-sided UK MiFIR reporting as well. The conceptual shift, from ‘reporting submission’ to ‘reporting data quality’, is one of the lasting effects of the REFIT changes.

What Reporting Firms Have Done Well

The FCA commentary is not all critical. Three areas of broad improvement stand out from 2024-2025:

• Pre-submission LEI validation: widely implemented across UK reporting infrastructure. The previous norm of submitting reports and seeing rejection-notification feedback has been replaced by a culture of front-loaded validation.

• Trade-time precision: improved across the board, helped by ISO 20022’s tighter timing-field constraints. Trade-time fields that were once rough approximations are now precise to the second.

• Counterparty data hygiene: the wave of LEI registration and renewal during 2024 and 2025 has lifted the baseline quality of counterparty reference data, a structural improvement for the UK reporting ecosystem.

These are real wins, and they should not be lost in the focus on persistent issues. The story of 2024-2025 has been one of net improvement, not deterioration.

Practical Action Points for 2026

If you are responsible for UK transaction reporting at an FCA-authorised firm, six practical action points emerge from the 2024-2025 themes:

1. Audit your pre-submission LEI validation: confirm it covers every LEI field in your reports and that the validation includes status, Issued, Lapsed, etc., not just LEI format.
2. Build or refresh your counterparty LEI watchlist: track upcoming counterparty LEI renewals and pre-emptively engage with counterparties whose LEIs are approaching the lapse date.
3. Review your instrument identifier sourcing: trace each ISIN field in your reports back to its source data and assess the freshness of that source.
4. Implement explicit completeness controls: reconcile your submitted reports against your trade data, not just your reporting-system output.
5. Add cross-field consistency validation: build or commission validation that checks internal consistency between executing entity, decision-maker, beneficial owner, country, and timing fields.
6. Tighten your reconciliation cycle: respond to TR-flagged mismatches within an explicit SLA, not on a best-efforts basis.

Each is operationally achievable with the infrastructure most firms already have. The themes are persistent precisely because they require ongoing discipline rather than one-off implementation effort.

How TNV-LEI Helps

TNV-LEI is a GLEIF-accredited Local Operating Unit. We support UK reporting firms and their counterparty entities in four ways relevant to the themes in this post:

• LEI provision for FCA-authorised reporting firms whose own LEIs appear in transaction reports they submit

• LEI provision for counterparty entities whose LEIs appear as counterparty, beneficial owner or decision-maker in reports submitted by FCA-authorised firms

• Renewal management to keep counterparty LEIs in Issued status, with multi-year terms reducing the operational lapse risk

• Free transfer from any other LOU under GLEIF policy, with no change to the 20-character LEI code, supporting LEI consolidation under a single LOU

Authorised representatives can submit applications on behalf of clients under our LOU accreditation, supporting compliance teams that coordinate LEI registration across a counterparty network.

Related Resources

Parent Pillar and Cluster

• LEI Registration in the United Kingdom

• FCA SUP 17A: UK Transaction Reporting Obligations

Related Regulation Clusters

• UK MiFIR Reporting

• UK EMIR REFIT

• UK SFTR

Related Blog Posts

• UK EMIR REFIT in 2026: Lessons from Twenty Months of Operation

Educational Resources

• GLEIF Global LEI Index Explained

• LEI Reference Data Fields

• LEI Glossary