One swap venue told the regulator its order book has never carried a single trade, and the regulator now proposes to stop requiring one

Not one trade. Not one order, either.

That is what LSEG FX SEF told the Commodity Futures Trading Commission its order book had taken across the whole time the thing has been switched on, a period the venue dates to before it obtained temporary registration in 2013. The sentence sits on page nine of a proposal the Commission put out on Thursday, and it is the strongest single fact in it.

The proposal would amend regulation 37.3(a)(2) so that a swap execution facility must offer an order book only for required transactions, meaning swaps caught by the trade execution requirement in section 2(h)(8) of the Commodity Exchange Act. For everything else, which the rules call permitted transactions, the book becomes optional.

What the numbers say

The evidence that the mandated books sit empty did not come from an examination. It came from the venues themselves, asking to be let off.

Bloomberg's SEF told the Commission that since 2015, more than 96 percent of order book trading has been in required transactions and less than 4 percent in permitted ones. A 2018 white paper by the Commission's own former chairman, J. Christopher Giancarlo, and Bruce Tuckman put order book trading at between less than 1 percent and less than 3 percent of credit default swap volume on SEFs, and between less than 1 percent and roughly 20 percent of interest rate swap volume, depending on the product.

The Commission's reading of that is in the document. It preliminarily believes an order book cannot support swaps that trade episodically rather than continuously, and it reaches for an academic footnote to say so, citing work on index credit default swaps whose authors point at off-the-run Treasuries as the worked example of what happens to electronic trading when volume drains away.

The letter that came first

None of this is news to the venues. In July 2025 the Division of Market Oversight issued no-action letter 25-24, telling SEFs that staff would not recommend enforcement against one that failed to offer a book for permitted transactions. Securities and Exchange Commission staff took an identical position for security-based swap venues in February.

A no-action letter binds the division that signs it and nobody else, and it can be pulled at any time. The Commission says as much, and says that putting the position into a rule is the public interest benefit of doing this at all, because a rule offers more long-term certainty and a genuine chance for outsiders to be heard.

It then concedes something more awkward in the cost-benefit section. Because SEFs are already relying on the staff position, the savings the proposal claims may largely have been banked already, and the true baseline is not the rule as written but the market as it actually operates.

The question at the end

Buried in the request for comment is the question the proposal does not answer. Question three asks whether the Commission should eliminate the order book requirement for required transactions as well, which is the half of the rule this proposal deliberately leaves standing.

Questions six and seven ask the industry to say in dollars what building and running these books has cost. That is the Commission admitting it does not know.

Comments close 30 days after the proposal reaches the Federal Register. If it is adopted, the rule would take effect 30 days after that.