Insider trading on prediction markets: the cases and the law

Insider trading on prediction markets is illegal in at least some cases, and the cases that exist so far show how. In April 2026 US authorities charged an Army soldier over bets on the Maduro raid, and the CFTC says misusing confidential information on a regulated event-contract exchange can break the same commodities-fraud rule it enforces elsewhere.

What are the documented insider trading cases?

Three episodes are well sourced, and each shows a different kind of insider.

The first two came from Kalshi itself. On 25 February 2026, Kalshi published two closed enforcement cases. A candidate for governor of California had traded about $200 on his own candidacy and posted about it. Kalshi's surveillance team spotted an online video of the trade, froze the account, and issued a 5-year ban. The second trader, who put about $4,000 into markets tied to a YouTube streamer's videos, turned out to be an editor on the show and got a 2-year suspension.

The CFTC's Division of Enforcement then issued an advisory the same day that gave the dollar figures. The candidate paid a $2,246.36 financial penalty, including $246.36 of disgorgement. The editor paid $20,397.58, including $5,397.58 of disgorgement. These are small numbers.

The third case is the largest. NPR's Bobby Allyn reported on 23 April 2026 that an indictment was unsealed against Gannon Ken Van Dyke, a 38-year-old special forces soldier at Fort Bragg. Prosecutors allege he placed about $32,000 in bets on Polymarket that Nicolas Maduro would soon be out of power and won more than $400,000 (allegations, not findings of guilt). The counts include wire fraud, commodities fraud and misusing non-public government information.

What does the law say about event contracts and securities?

Classic insider trading law is built around securities. Proskauer Rose lawyers wrote in March 2026 that traditional liability requires buying or selling a security, and that most event contracts are not one. Their point was that this does not make insider-informed bets safe. Event contracts on a CFTC-registered exchange fall under commodities fraud and manipulation rules, and a contract tied to a single company's stock may qualify as a security-based swap, which would bring the SEC in.

The CFTC's own position is in its February advisory. It says the Commission has full authority to police illegal trading on any designated contract market, and it names "misappropriation of confidential information in breach of a pre-existing duty of trust and confidence to the source of the information (commonly known as 'insider trading')" under Section 6(c)(1) of the Commodity Exchange Act and Regulation 180.1. In plain terms, the problem is not that the information was secret but that you took it from someone you owed loyalty to.

Someone who works out a surprise from public clues has done nothing wrong. A streamer's editor who knows what the next video contains has.

What have the CFTC and Congress said?

The advisory also says exchanges have an independent duty to run surveillance and enforce their own rules. On 23 April 2026 the CFTC filed its own complaint alongside the criminal case, according to NPR's reporting. Jay Clayton, the US Attorney for the Southern District of New York, said: "Prediction markets are not a haven for using misappropriated confidential or classified information for personal gain."

Congress has moved too. CNBC's Justin Papp reported on 22 May 2026 that House Oversight Chair James Comer opened an investigation and sent letters to the CEOs of Polymarket and Kalshi. CNBC also noted that Kalshi had suspended three congressional candidates in April for betting on their own races.

What do the platforms prohibit?

Both main platforms now prohibit trading on inside information, and both tightened the wording in 2026. Per the CFTC advisory, Kalshi's rules bar trading a contract you can directly or indirectly influence, and trading on material non-public information. Both February cases rested on those rules.

Polymarket published enhanced market integrity rules on 23 March 2026. Grant Mitchell of Covers summarized them as barring three things: trading on stolen or confidential information in breach of a duty, trading on illegal tips, and trading by people who can influence an outcome (his example is a member of Congress trading contracts on a specific bill). CNBC reported that Polymarket says its international operations are not overseen by US regulators, while Kalshi says it is a US-regulated exchange.

Why is "public information only" easy to say and hard to enforce?

The rule fits in one sentence: trade on what anyone could know, not on what you were trusted to keep quiet. Enforcing it is harder for three reasons.

First, the line between inference and leak is blurry. A well-timed trade looks the same whether it came from sharp research or a phone call. Kalshi's surveillance flagged the editor because his record on low-odds markets looked statistically implausible, which is a hint and not a proof. Kalshi then had to establish that he had prior access to the videos.

Second, many cases were found by accident. The candidate was caught because he posted a video. The editor drew user tips. Kalshi said it opened about 200 investigations in the past year and that over a dozen became active cases, which suggests how much flagged activity never becomes a charge.

Third, jurisdiction. A platform can only discipline accounts it can identify and reach, and not every venue is a US-regulated one. As Polymarket's chief legal officer Neal Kumar put it after the soldier's indictment, according to NPR, "It's not anonymous."

What does a play-credit market do differently?

A free-to-play market has no deposits and no cash payout from trades, so the incentive to leak or exploit information is weaker. The remaining incentive is reputation: a place on a leaderboard, and a shot at the prizes.

That does not remove the fairness problem. A trader who knows an outcome in advance still distorts the price for everyone else, and people who traded in good faith still lose ranking to someone with a leak. Play credits make the cost of that lower, not zero. Any market, including Ravioli, needs clear rules, public resolution sources and surveillance for implausible streaks. We cannot claim to have solved it. For background on how prices become probabilities and who settles a market, see how market odds and resolution work and who decides what actually happened.

Ravioli is a free-to-play prediction market. You trade with Sense, which is free, and the prizes are real.

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