SEC Sides With CFTC in Court Fight Over Single-Stock Perpetuals

The SEC has told a federal court it backs the CFTC's approval of single-stock perpetual futures, siding against a lawsuit that seeks to move the products under its own jurisdiction. The amicus brief, filed in a case brought by the Capital Markets Alliance Association on November 3, 2026, cuts directly against the plaintiffs' core argument. The group wants the contracts reclassified as security-based swaps. The SEC just said, in effect, it doesn't agree.

The case turns on a definitional puzzle. A traditional futures contract expires on a set date and settles. A perpetual future has no deadline at all. The CFTC approved single-stock versions after a 45-day review under Regulation 40.3, classifying them as security futures under the Commodity Futures Modernization Act of 2000. That label lets them trade on qualifying exchanges.

The plaintiffs see it differently. Their suit names the CFTC and its chairman, Michael S. Selig, and argues that a contract with no expiration never creates an obligation of delivery. If nothing is ever due, they contend, calling it a "future" stretches the definition past its breaking point. Security-based swaps would fall under SEC jurisdiction, with a different — and generally tougher — investor-protection framework attached.

What has the court said so far?

The record is mixed for both sides. The court signaled the plaintiffs are likely to succeed on their claim that the products are security-based swaps. It also denied their request for a temporary restraining order, finding they had not shown irreparable harm. So the approval stands while the legal question hangs over it.

Who lined up on which side?

The amicus filings split along predictable — and revealing — lines.

• Backing the CFTC: Coinbase Derivatives and Kalshi filed briefs supporting the approval. The SEC's brief joins their side.
• Opposing it: Better Markets and a group of former SEC officials filed against.

The crypto angle sits in the list of eligible venues. Coinbase Derivatives, KalshiEX and Bitnomial Exchange are positioned to list these contracts. Two of them are also defending the CFTC in court, so their interest is easy to read.

Security futures already sit in an unusual spot in US market structure. Both agencies jointly oversee them, which is rare in American regulation. The SEC's support suggests the two regulators are, for now, comfortable sharing that arrangement rather than fighting over turf.

Incumbents versus newcomers

The plaintiff group's membership tells its own story. Cboe runs major US options and equities venues. Citadel Securities is one of the largest market makers in US stocks. These are incumbents defending existing market structure.

The defenders come largely from the crypto and prediction-market world. Coinbase Derivatives and Kalshi built their US businesses under CFTC oversight. Bitnomial operates in the same regulatory lane.

What does this change for platforms?

If the plaintiffs win, the regulatory picture shifts substantially. Securities rules carry heavier investor protections than the framework these products operate under now. Exchanges would face more scrutiny of how the contracts are offered and to whom. Platforms like Coinbase Derivatives, Kalshi and Bitnomial could be forced to rework — or pull entirely — a product line approved through the CFTC process.

What does this change for traders today? In the near term, nothing. The contracts trade under valid CFTC approval. The risk is retrospective: a merits ruling against the classification could unwind the product's legal footing after firms have already built around it.

The SEC's brief adds weight to the CFTC's side, but it's not decisive. Courts interpret statutes, not agency preferences. The definition of a futures contract under the 2000 law will likely matter more than which regulator is comfortable with the outcome — and the court has already signaled it finds the plaintiffs' reading persuasive on the merits.

The variable to watch is the merits ruling itself. A judge who thinks the plaintiffs are likely to win has not yet ruled on whether they actually do. Until that decision lands, platforms listing these products operate in the gap between an approval in hand and a legal question unresolved.