About a-team Marketing Services
The knowledge platform for the financial technology industry
The knowledge platform for the financial technology industry

A-Team Insight Blogs

US Consolidated Audit Trail Swings into Action

Subscribe to our newsletter

The US Consolidated Audit Trail (CAT) swung into action last week after long delays and in a limited way, with members of self-regulatory organisations (SROs) within the CAT NMS (National Market System) Plan, except small SRO members, starting to report to the central repository.

Early reporting follows the end of October publication by Thesys CAT, operator of the CAT, of long-awaited reporting technical specifications. SROs are initially reporting quote, order, trade and other information required under the CAT NMS Plan, although Thesys CAT has yet to complete all the capabilities of first phase reporting. It has advised the SROs that it is continuing to work on outstanding elements, such as the regulators’ query functionality and links between reported events, and plans to complete the full functionality required by the CAT NMS Plan for the first reporting phase on or before March 31, 2019.

While SRO members started to submit data to the CAT on November 15, 2018, small SRO members must follow suit on November 15, 2019.

The CAT is intended to allow regulators to improve securities’ market surveillance by creating an extensive audit trail of customer and order event information for all orders in US exchange-listed and over-the-counter (OTC) equity securities across all markets and trading venues. It is also meant to collect data for exchange-listed options contracts. If implementation of the CAT is completed fully and successfully, which is a mighty challenge for all concerned, it is expected to be the largest data repository of information on securities transactions in the world.

Subscribe to our newsletter

Related content

WEBINAR

Recorded Webinar: Unpacking Stablecoin Challenges for Financial Institutions

The stablecoin market is experiencing unprecedented growth, driven by emerging regulatory clarity, technological maturity, and rising global demand for a faster, more secure financial infrastructure. But with opportunity comes complexity, and a host of challenges that financial institutions need to address before they can unlock the promise of a more streamlined financial transaction ecosystem. These...

BLOG

Regulatory Developments 2026, a Cross-Jurisdictional Outlook

2026 regulatory themes are converging around the theme of continuous evidence – data quality, control effectiveness, and operational resilience demonstrated through repeatable artefacts rather than narrative attestations. In Europe, that direction is most explicit in ESMA’s data platform and supervisory tooling agenda, alongside the ESAs’ DORA-related coordination and oversight planning – see ESMA 2026 Annual...

EVENT

ExchangeTech Summit London

A-Team Group, organisers of the TradingTech Summits, are pleased to announce the inaugural ExchangeTech Summit London on May 14th 2026. This dedicated forum brings together operators of exchanges, alternative execution venues and digital asset platforms with the ecosystem of vendors driving the future of matching engines, surveillance and market access.

GUIDE

Regulatory Data Handbook 2025 – Thirteenth Edition

Welcome to the thirteenth edition of A-Team Group’s Regulatory Data Handbook, a unique and practical guide to capital markets regulation, regulatory change, and the data and data management requirements of compliance across Europe, the UK, US and Asia-Pacific. This year’s edition lands at a moment of accelerating regulatory divergence and intensifying data focused supervision. Inside,...