SEC Launches Major Review of Consolidated Audit Trail Systems
The SEC is soliciting public comment on a broad review of CAT and related audit trails.
Why it matters: A potential overhaul of CAT could reshape broker-dealer compliance, reporting workflows, and legal oversight across U.S. markets, affecting everything from cost structures to data privacy liabilities.
- On April 16, 2026, the SEC issued a concept release seeking comment on the CAT's purpose, funding, structure, cybersecurity, and privacy.
- Annual CAT operating costs ballooned from $55.8M in 2016 estimates to over $248M by 2025.
- A March 2026 SEC-approved amendment is projected to save $50M–$70M annually.
- The public comment period will last 60 days after publication in the Federal Register.
The SEC's April 2026 concept release invites public input on nearly every facet of the Consolidated Audit Trail (CAT), which has served as the backbone for U.S. market surveillance since its establishment.
- The SEC asks for feedback on CAT's funding mechanisms, cost management, regulatory role, governance model, system design, and data privacy protections.
- The Commission explicitly seeks input on whether alternative audit trails or data sources could do the same job as CAT.
SEC Chairman Paul S. Atkins noted recent actions “reduced the CAT's projected annual operating costs by over $100 million and permanently eliminated the reporting of personal identifiable information.” But, in his words: “We can – and must – do more. Accordingly, the concept release seeks comment on foundational and existential aspects of the CAT.”
The CAT's rising costs—jumping from an initial estimate of $55.8 million in 2016 to more than $248 million by 2025—have drawn scrutiny. In March 2026, the SEC approved a rule amendment estimated to yield $50 million to $70 million in annual savings.
Privacy concerns also loom large. Commissioner Hester M. Peirce characterizes the CAT as “expensive, contentious, and perilous to privacy,” further warning that its premise “should trouble all of us.”
The SEC's review also suggests possible reforms to the CAT’s ongoing status as a National Market System (NMS) plan and its governance structure—issues with legal, operational, and financial implications for market participants.
The public comment window will remain open for 60 days following publication in the Federal Register, giving industry professionals and the public ample opportunity to help shape the CAT’s future direction.
By the numbers:
- $55.8M — Original CAT annual operating cost estimate in 2016
- $248M — Actual CAT annual operating costs by 2025
- $50M–$70M — Expected annual cost savings from SEC's March 2026 amendment
Yes, but: Specific actions the SEC will take on privacy or governance reforms have not been detailed, and the timeline for implementation remains unclear.
What's next: Expect significant engagement and position filings across the securities industry as the 60-day comment period progresses.