The SEC is weighing whether to take the wheel on one of the most ambitious, and most contentious, surveillance projects in US financial history. The Consolidated Audit Trail, a massive database designed to track every trade across US equities and options markets, has been a source of friction between regulators and the industry for over a decade. Now, after Citadel Securities successfully challenged the system’s funding model in court, the agency appears ready to consider a much more hands-on approach.
The shift follows a July 2025 ruling by the Eleventh Circuit Court of Appeals that vacated the SEC’s 2023 funding order for the CAT, finding the agency had overstepped its previous positions and ignored industry concerns. That ruling didn’t just embarrass the SEC. It created a regulatory vacuum around how the database gets paid for, and who ultimately calls the shots.
A database born from crisis
The CAT exists because of one very bad afternoon. On May 6, 2010, the Flash Crash temporarily erased nearly $1 trillion in market value, exposing regulators’ inability to quickly reconstruct what had happened in the markets. The SEC adopted Rule 613 in 2012, mandating the creation of a comprehensive audit trail that could piece together trades across all venues in something closer to real time.
