SEC backs CFTC in court fight over single-stock perpetual futures

Washington’s two market regulators usually argue over turf. This time, one is defending the other in court.

The SEC has filed an amicus brief supporting the Commodity Futures Trading Commission, which is being sued over its approval of single-stock perpetual futures. The lawsuit comes from the Capital Markets Alliance Association, an industry group whose members include Cboe and Citadel Securities.

The stakes go beyond one product. The case asks which agency gets to police a new kind of derivative tied to individual stocks. It also decides whether crypto-native venues like Coinbase Derivatives and Kalshi can list it.

What the lawsuit is actually about

Start with the product. A traditional futures contract is a bet with a deadline: it expires on a set date, and the trade settles. A perpetual future drops the deadline entirely, so a position can stay open indefinitely.

The CFTC approved single-stock versions of these contracts after a 45-day review under its Regulation 40.3. It classified them as security futures under the Commodity Futures Modernization Act of 2000. That label allows them to trade on exchanges that meet the relevant requirements.

The Capital Markets Alliance Association disagrees with that label. Its suit, filed November 3, 2026, names the CFTC and its chairman, Michael S. Selig. The group argues the contracts are really security-based swaps, which would place them under SEC jurisdiction.

The reasoning hinges on delivery. A futures contract traditionally obligates delivery at some future point. The plaintiffs argue that a contract with no expiration never creates that obligation. If nothing is ever due, they contend, calling it a future stretches the definition past its breaking point.

The court has already weighed in, and the result was mixed for both sides. It signaled that 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.

Who lined up on which side

The SEC’s brief is the headline, partly because it cuts against the plaintiffs’ framing. The lawsuit argues these products belong under SEC oversight. The SEC itself has now told the court it backs the CFTC’s approval.

Security futures already sit in an unusual spot. They are jointly overseen by both agencies, which is rare in US market regulation. The SEC’s support suggests the agencies are, for now, comfortable sharing the arrangement.

Other amicus briefs split along predictable lines. Coinbase Derivatives and Kalshi filed in support of the CFTC. On the other side, Better Markets and a group of former SEC officials filed briefs opposing the approval.

The crypto angle sits right there in the list of eligible venues. Coinbase Derivatives, KalshiEX and Bitnomial Exchange are among the platforms positioned to list these contracts. Two of those firms are also arguing for the CFTC in court, which makes their interest in the outcome fairly easy to read.

The incumbents versus the newcomers

The membership of the plaintiff group is worth noticing. Cboe runs major US options and equities venues. Citadel Securities is one of the largest market makers in US stocks.

The defenders of the approval, meanwhile, 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 this means for markets and platforms

If the plaintiffs win and the contracts are deemed security-based swaps, the regulatory picture changes substantially. Securities rules generally carry tougher investor protections than the framework currently applied to these products. That could mean more scrutiny of how the contracts are offered and to whom.

For platforms like Coinbase Derivatives, Kalshi and Bitnomial, it could mean reworking or pulling a product line that was approved through the CFTC process.

The court’s early signal is the variable to watch. A judge who thinks the plaintiffs are likely to win on the merits has not yet ruled on those merits. Platforms listing these products are operating in that gap, with approval in hand and a legal question hanging over it.

The SEC’s brief adds weight to the CFTC’s side, but courts interpret statutes, not agency preferences. The definition of a future under the 2000 law will likely matter more than which regulator is comfortable with the outcome.