Robinhood's Fastest-Growing Line Just Met the Ninth Circuit

On Friday 28 August 2026, a three-judge panel of the Ninth Circuit ruled unanimously that sports event contracts are not federally regulated swaps, and that states may apply their gambling laws to them. Robinhood Markets was a named party to the case, and its own request for injunctive relief against the Nevada Gaming Control Board was refused. The line the ruling threatens is the fastest-growing one the company has: event contracts produced $156m of revenue in the second quarter of 2026, up from roughly $10m a year earlier, on a record 13.6 billion contracts traded — out-earning both equities and crypto trading for the first time in Robinhood's history.

The shares closed about 5% lower. That is either far too little or roughly right, and the answer turns on a question the wire coverage skipped: how much of that $156m is sports, and how much of the sports business sits inside the states this ruling actually reaches. Nobody outside the company knows the first number, because Robinhood does not break it out. What can be established is the shape of the exposure, the legal timetable — which now has a date on it three days from now — and what the ruling does and does not do.

What actually happened

The Ninth Circuit ruled 3-0 in favour of Nevada, rejecting the argument that the federal Commodity Exchange Act preempts the application of state gaming law to sports event contracts offered by Kalshi, Crypto.com and Robinhood. The panel affirmed the dissolution of Kalshi's preliminary injunction, leaving Nevada's regulators free to enforce state gambling law against these products.

The reasoning is narrow and, for the industry, uncomfortable. The court held that the statutory definition of a swap turns on the occurrence or non-occurrence of an event with a financial, economic or commercial consequence — and that the result of a sporting contest is not that. In the court's framing, the contracts were not swaps because they were sports bets. Every one of the preemption arguments advanced was rejected.

This matters more than a single-state enforcement action because of what it collides with. In April 2026, the Third Circuit — hearing New Jersey's case against Kalshi — ruled 2-1 the other way, finding that the CFTC holds jurisdiction over sports-related event contracts. Two federal appellate circuits now hold directly opposing views on the same statutory question. That is the most reliable trigger there is for Supreme Court review, and the CFTC has signalled it expects the fight to go there.

The timetable is unusually concrete. New Jersey, the losing party in the Third Circuit, has a deadline of 3 September 2026 to file its certiorari petition asking the Supreme Court to review that decision — a deadline set by Justice Alito when he granted the state's extension. That filing converts Supreme Court review from speculation into a docketed process. It does not guarantee the Court takes the case; some observers expect the justices may prefer to let further appellate rulings accumulate first.

Why the market reacted the way it did

A 5% move on a ruling that goes to the legality of a company's best-performing business looks light until you separate what was decided from what was not.

What was decided: state gambling law can be applied to these contracts within the Ninth Circuit, and Robinhood does not get an injunction protecting it from Nevada. What was not decided: anything about the rest of the country, anything final about CFTC jurisdiction, and anything about non-sports event contracts — elections, economic data, and the rest of the prediction-market catalogue — which the ruling's reasoning does not obviously reach, since those events plainly do carry financial, economic or commercial consequence.

So the market is pricing a partial, appealable, geographically bounded adverse outcome on a subset of one revenue line. Five per cent is a defensible price for that. The harder question is whether the market is correctly pricing the second-order point, which is about the composition of Robinhood's growth rather than its legality.

Look at the second quarter properly. Net revenue was a record $1.31bn, up 32% year on year, with EPS of $0.62. Inside that, event contracts contributed $156m — around 12% of group revenue and roughly 20% of transaction revenue. Over the same period, crypto trading revenue fell 38% year on year and 25% sequentially to $100m. Those two facts belong in the same sentence. Event contracts did not merely grow; they grew more than tenfold and overtook crypto in the exact quarter that crypto contracted sharply. The prediction-market line has been holding up the growth rate while the business that drove the previous re-rating went backwards.

That is what makes this ruling structurally more significant than a 5% move suggests. It is not a side bet being litigated. It is the growth engine.

There is a further caveat that cuts the same way and has nothing to do with courts. Coverage of the quarter noted that a meaningful share of prediction-market volume came from one-off events — the World Cup and the midterm elections — which raises a sustainability question independent of the legal one. A line that grew tenfold partly on a calendar of exceptional events, and which now faces a circuit split, is carrying two distinct risks at once.

The Openbook read

Growth is the strongest factor and also the most exposed, which is an unusual and important combination. Thirty-two per cent revenue growth to a record quarter is a genuine number. But the marginal contribution is concentrated: one line, less than two years old, part of it event-calendar dependent, and now subject to adverse appellate precedent in one circuit and favourable precedent in another. A growth score is a description of past delivery; the useful work is asking what happens to it if the largest single contributor to the growth rate is constrained. Strip the year-on-year increase in event contracts out of the comparison and the growth rate falls materially — this is a quality-of-growth issue that the headline figure does not surface.

Profitability is solid and largely untouched by Friday. Event contracts are a high-margin transaction business, so a constraint on them would hit profitability more than proportionally to revenue, but the quarter itself gave no reason to mark the factor down.

Solvency is not in question here. This is a well-capitalised brokerage; the legal risk is to a revenue line, not to the balance sheet. Nothing in the ruling creates a liability, and the case concerned injunctive relief rather than damages.

Momentum has been strong and is now hostage to a court calendar rather than to operating news. That is a materially worse kind of momentum to own, because the catalysts are exogenous, binary and impossible to handicap from the fundamentals. A 3 September petition, an unknowable cert decision, and a possible Supreme Court term all sit between here and resolution.

Reward/Risk is where this resolves, and it is the factor that the headline multiple hides. A business where a single regulated line drives the growth rate, and where that line's legality differs by federal circuit, has a risk profile that no earnings multiple captures. The reward case is real: if the Supreme Court eventually adopts the Third Circuit's reading, the constraint lifts nationally, the addressable market for event contracts is very large, and Robinhood has already demonstrated it can capture it at scale — 13.6 billion contracts in a quarter is not a pilot. The risk case is that state-by-state enforcement fragments the product, the calendar-driven volume does not recur, and the growth rate reverts to a crypto-and-equities business that was shrinking in one of its two halves.

The correct framing is timing and optionality, not write-off. Nothing has been extinguished. What has changed is that the range of outcomes widened at both ends and acquired a schedule.

The read-across

The clearest read-across is to the licensed sportsbooks, which traded as the mirror image on Friday. Flutter Entertainment, FanDuel's owner, closed about 7% higher, and DraftKings also finished up on the same ruling — reported figures for the size of the DraftKings move vary too widely across sources to put a number on it. Neither was a party to the case. The logic is that keeping event contracts inside state gambling frameworks preserves the value of a licence — the sportsbooks have paid for state-by-state regulatory access, and a ruling that forces prediction-market venues to do the same converts a competitive disadvantage back into a moat. Both companies have been working on their own prediction-market offerings, which they would run from inside the licensed perimeter rather than outside it.

That is a useful way to think about the whole category: this ruling did not decide whether prediction markets exist, it decided who has to buy a licence to run them. The read-across for the brokerage sector is narrower — other retail platforms have added event contracts, and any that treat the CFTC framework as sufficient cover now carry the same circuit-dependent exposure that Robinhood does.

For the wider index, the significance is thematic rather than mechanical. Prediction markets have been one of the few genuinely new retail financial products of this cycle, and Friday established that its regulatory architecture is unsettled at the appellate level. Anyone screening for exposure to the theme — our screener is the place to map it — should now treat the legal status as a variable input rather than a settled backdrop.

What to watch next

• 3 September 2026 — New Jersey's certiorari petition. The deadline set by Justice Alito. The filing itself is close to certain; what matters is how the state frames the circuit split, because that framing shapes the odds of the Court granting review.
• Whether the Supreme Court grants certiorari. A grant would put a definitive national answer on the calendar. A denial, or a decision to wait for further appellate rulings, leaves the product legal in some circuits and not others — the worst operating outcome for a national platform, and the one least discussed.
• Nevada enforcement action. The Ninth Circuit left the state's regulators free to act. What they actually do, and how quickly, is the first real-world test of what the ruling costs.
• Third-quarter results, expected in late October or early November. The disclosure to look for is any breakdown of event-contract revenue between sports and non-sports, and between affected and unaffected jurisdictions. Robinhood has not provided that split. If the legal position tightens, the pressure to provide it will grow. Note that the event calendar does not clear in the third quarter the way a simple comparison implies: the World Cup ran to its final on 19 July, and the November midterms sit in the fourth quarter with contract volume building through the autumn, so the cleanest read on underlying demand comes later than this print.