Picture a trader who holds information nobody else has: an announcement they have seen before it is public, the inside of a decision they are paid to help make. Then picture a prediction market quoting odds on exactly that outcome. The temptation is obvious, and so is the question. Does the law treat that trade the way it treats a tip whispered on a trading desk about a pending merger?
The short answer is that on prediction market venues registered with US commodities regulators, there is a specific legal framework that reaches this conduct, and it does not depend on the contract looking anything like a share of stock. The framework has been there for years.
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Why the question keeps coming up
Event contracts are a strange hybrid in the public imagination. They feel like bets to some people and like derivatives to others, and the two mental models carry very different intuitions about what counts as cheating. A football accumulator placed with information from inside the dressing room is a betting-integrity problem. A stock trade placed on a leaked earnings call is a securities problem. An event contract placed with material nonpublic information sits in a third category, and the rules that govern it are the rules that govern US commodities trading.
That matters because the category decides which regulator shows up, which statute is cited, and which conduct is actually prohibited. For readers coming from a sports-betting background or a general-markets background, our plain-English guide to what event contracts are sets the scene for why the commodities framework applies in the first place.
The rule that does the work
US commodities law contains a broad prohibition on the use of manipulative or deceptive devices in connection with contracts traded on registered venues. The language is intentionally wide. It covers schemes and artifices to defraud. It covers untrue or misleading statements of material fact. It covers acts, practices or courses of business that operate as a fraud on any other person. And it covers the delivery of false or misleading reports concerning information that affects or tends to affect the price of a commodity.
That last limb is interesting because it is not confined to stocks or to companies. It bites on anyone who sends false market-affecting information through the usual channels, which is a surprisingly contemporary problem.
The broader statute underneath that rule also makes it unlawful to manipulate, or attempt to manipulate, the price of a commodity or of any contract traded on a registered venue. Attempt is doing real work in that sentence. You do not have to succeed to be caught.
What “insider trading” means in this corner of the law
Most people picture insider trading as a securities concept: a corporate officer trading their own company's shares before an earnings release. The commodities version is framed differently. The US Commodity Futures Trading Commission, which supervises registered prediction market venues, has publicly described one species of prohibited conduct as the misappropriation of confidential information in breach of a pre-existing duty of trust and confidence to the source of the information, and has flagged that this is commonly known as insider trading.
That phrasing matters. The wrong is not simply knowing something other traders do not know. The wrong is trading on information you obtained in a way that betrayed a duty you already owed to someone else. Trading a contract whose price turns on that information is where the commodities regulator says the rules bite.
There is no requirement that the venue be a stock exchange, and no requirement that the underlying event be a corporate one. The framework applies to any contract traded on a registered venue.
What venues are expected to do
Registered venues are not passive conduits. The statute requires them to maintain audit trails, run surveillance, and enforce rules against prohibited practices as a condition of their registration. That is a core-principles obligation; it is not optional.
In practice, this is why registered venues publish their own trading rules and operate internal compliance teams. The CFTC's enforcement advisory on prediction markets makes clear that KalshiEX LLC's own rules prohibit trading in a contract where the trader has direct or indirect influence over the outcome, and prohibit trading on material nonpublic information obtained in breach of a pre-existing duty. Those are venue rules, enforced in the first instance by the venue itself. The regulator sits above that enforcement, with the power to investigate and prosecute independently where it chooses to.
For a sense of how a venue is structured and supervised, our walk-through of why Kalshi's CFTC registration matters for US access picks up the registration side of the story.
Who the regulator can go after
The commodities regulator's enforcement remit is not limited to venues. It reaches persons, which in the statutory sense is a broad category that includes individuals. The regulator has publicly stated that it has full authority to police illegal trading practices occurring on any registered venue, including prediction market venues, and that in appropriate cases it will investigate and prosecute. Alongside misuse of nonpublic information, that enforcement universe explicitly includes pre-arranged noncompetitive trading and wash sales, other disruptive trading practices, and fraud and manipulation more generally.
The practical point for readers is that the authority exists at two levels at once. The venue can enforce its own rulebook, and the regulator can bring a separate action under the statute. The two are not alternatives. One can follow the other.
Where the picture is less clear
Not every prediction market platform operates under the US commodities framework. The rules that apply to a given trader depend heavily on where the venue is registered and where the trader sits. On non-US-registered venues, the specific statutory architecture described above does not apply in the same way, and whatever rules do apply are a function of that venue's own rulebook and whatever regulator claims jurisdiction over it. The honest answer in those cases is that users have to read the specific venue's terms and the specific jurisdiction's law.
For the broader legal lie of the land, our overview of the US legal position for prediction markets and the UK-side companion are the starting points. Neither of those is a substitute for advice on a specific case.
Why this is worth understanding even if you never do it
Market integrity rules exist for a reason that goes beyond punishing individuals. Prediction markets are useful to the extent their prices are informative, and prices stop being informative when a non-trivial share of the flow comes from people trading against counterparties who do not have the same information. Readers who want the broader argument on when prediction market prices tell you something and when they do not can start with our explainer on why prediction markets are often accurate, and the specific ways that breaks down.
Frequently asked questions
Is insider trading on prediction markets actually illegal?
On US commodities-regulated prediction market venues, the use of manipulative or deceptive devices in connection with contracts traded on those venues is prohibited by statute, and the commodities regulator has publicly said that this includes misappropriation of confidential information in breach of a pre-existing duty of trust and confidence to the source of the information, which it describes as commonly known as insider trading. That framework reaches individual traders, not just the venues. On platforms that are not registered with US commodities regulators, the specific statutory architecture does not apply in the same way, and the answer depends on the venue's own rulebook and the law of the jurisdiction that claims it.
Does it count as insider trading if I bet on an outcome I personally control?
On registered US prediction market venues, trading in a contract where you have direct or indirect influence over the outcome is prohibited by the venue's own rules, and the commodities regulator has flagged that conduct of this type can also fall within the broader statutory prohibition on manipulative and deceptive devices. The point is that you are not simply holding better information than the market; you are in a position to shape the thing the market is pricing, which is a different problem. The specific details of what counts as influence will be in the venue's rulebook, and the regulator's reach sits on top of that.
Which regulator oversees this on US prediction markets?
The US Commodity Futures Trading Commission supervises prediction market venues that are registered as designated contract markets under US commodities law. Its enforcement division has publicly addressed misuse of nonpublic information and related misconduct on prediction markets, and has said it has full authority to police illegal trading practices occurring on any registered venue of this type. The venues themselves have an independent duty under the statute to maintain audit trails, conduct surveillance, and enforce rules against prohibited practices. So enforcement runs on two levels: the venue's own compliance programme and the regulator's authority to investigate and prosecute. Which one acts in a given case depends on the facts and on how the venue and the regulator coordinate.
What kinds of conduct, besides insider trading, are prohibited?
The commodities regulator's advisory on prediction markets lists several categories of prohibited conduct beyond misuse of nonpublic information. These include pre-arranged, noncompetitive trading and wash sales, in which trades are arranged in a way that does not reflect genuine market activity. They include disruptive trading practices more generally. They include fraud and manipulation under various sections of the commodities statute. The common thread is conduct that undermines the integrity of the price-formation process on a registered venue. The regulator's position is that these prohibitions apply to prediction markets in the same way they apply to other contracts traded on registered venues, and that it will investigate and prosecute in appropriate cases.
What is the venue's role versus the regulator's role?
Registered venues are required by statute to maintain audit trails, conduct surveillance, and enforce rules against prohibited practices as a core-principles obligation. In the first instance, that means the venue's compliance team investigates suspicious activity and can enforce its own rulebook. The commodities regulator sits above that process with its own enforcement authority, and has stated that it coordinates with venues on their enforcement dockets and on referral of appropriate potential violations for further investigation. Venue action and regulator action are not mutually exclusive. One can follow the other, and the regulator retains full authority to act on its own where it judges that appropriate.