SEC considers direct control of trade-tracking database after Citadel lawsuit

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.

The system was built and managed under a National Market System (NMS) Plan, with oversight delegated to self-regulatory organizations like FINRA and various stock exchanges. That structure meant the industry was effectively being asked to fund and partially govern its own surveillance apparatus, a setup that invited exactly the kind of conflicts now playing out in federal court.

Citadel Securities, one of the largest market makers in the world, has been at the center of the pushback. The firm initiated multiple legal challenges, including a January 2026 lawsuit seeking to freeze approximately $119 million in disputed CAT fees held in reserves by CAT LLC. In March 2026, Citadel and the American Securities Association filed a joint petition challenging the SEC’s funding order.

Industry calls for a takeover

In June 2026, the Securities Industry and Financial Markets Association, the powerful trade group representing broker-dealers and banks, publicly urged the SEC to eliminate the CAT National Market System Plan altogether. SIFMA’s position is straightforward: the current governance model is broken, costs are opaque and excessive, and the SEC should assume direct control rather than continuing to delegate to SROs.

On April 20, 2026, the agency released a concept document initiating a comprehensive review of the CAT and other market surveillance instruments. The review is expected to address three persistent sore spots: cost allocation, data privacy, and governance structure.

What direct SEC control would mean

If the SEC ultimately decides to take direct control of the CAT, it would represent a significant expansion of the agency’s operational footprint. For broker-dealers and market makers, direct federal oversight could bring more predictable cost structures and eliminate the governance conflicts that have fueled litigation.

The funding question remains unresolved. With the Eleventh Circuit having thrown out the 2023 model, and $119 million in reserves tied up in litigation, the CAT is operating in a kind of financial limbo. Any new governance structure will need to come with a funding mechanism that can survive judicial review.

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