Kalshi and Polymarket introduce new insider trading restrictions

Why the insider-trading guardrails landed now

Kalshi and Polymarket are tightening rules on who can trade and what information they can use as prediction markets move from niche finance into mainstream culture and sport. The shift follows months of scrutiny over whether these platforms can police trading on material nonpublic information and whether their compliance programs can keep pace with hockey-stick growth and brand partnerships. The regulatory drumbeat has grown louder too. Lawmakers have questioned the adequacy of self-policing, and the Commodity Futures Trading Commission has stressed it can still bring enforcement actions even when exchanges act first. The collision of rapid scale, expanding market types and higher-profile users set the stage for the new limits on insiders, whistleblower tools and clarified definitions of illegal tips and influence.

The guardrails are aimed at a simple problem that grows complex in practice: prediction markets convert information into prices. That means the line between savvy research and prohibited access can blur, especially when market subjects include politicians, media personalities and corporate campaigns. The platforms’ latest moves acknowledge that edge cases are now everyday cases as liquidity, media tie-ins and institutional attention expand.

Super Bowl ad markets exposed the vulnerability

One flashpoint came from event contracts tied to advertising in the NFL’s championship telecast. Ahead of the game, both platforms offered markets about which ads would run and who would appear in them. As chronicled in coverage of Super Bowl ad contracts that raised insider-trading concerns, those listings triggered debate because the outcomes were known in advance to many employees at agencies, brands and broadcasters. Unlike a score on the field, the content slate was locked before kickoff, widening the circle of potential insiders and elevating the risk of trades based on confidential production schedules.

The controversy did not allege specific misconduct, but it illustrated the enforcement challenge. If hundreds of people across marketing departments and production crews know the answer, compliance systems must identify, deter and, if needed, punish trading by anyone with access. That moment also sharpened the policy argument that the sector needs clear lines around who can trade on markets where they have influence or advance knowledge, and it gave urgency to platform updates that bar certain participants and solicit community flags.

Regulators affirmed authority as platforms acted

The CFTC has signaled it will not cede the field to private enforcement. In a recent statement underscoring its remit, the agency recounted how Kalshi had already disciplined users in two cases that touched on insider access and conflicts. As reported in the CFTC’s reaffirmation of authority after Kalshi uncovered insider trading, a political candidate who appeared to trade in a market tied to his career admitted violating platform rules and was fined and suspended. In another case, a media figure linked to a YouTube channel traded on a market about that channel and faced a larger penalty and temporary ban.

The commission said it keeps full power to pursue misappropriation of confidential information, noncompetitive trades, wash sales, fraud and manipulation, and it will coordinate with exchanges while bringing cases when appropriate. That stance threads a needle: encourage prompt self-policing by venues while keeping the threat of federal action for egregious behavior. It also raises the stakes for venues to demonstrate robust screening, to document decisions and to escalate when violations may breach federal law.

Record volumes magnified the stakes

Scale is turning edge risks into systemic ones. In November, the two platforms posted their highest monthly totals as the category cemented what analysts call an emerging duopoly. According to reporting on a combined US$10 billion month for Kalshi and Polymarket, retail activity surged on a steady cadence of news and tighter integrations that funneled users into markets on elections, macro headlines and global risk. Kalshi broke its own record with a sharp month-over-month jump, while Polymarket logged a double-digit percentage rise.

Growth has been matched by aggressive capital formation and distribution deals, steps that attract a wider universe of participants and counterparties. The more volume and visibility, the more incentive there is for would-be insiders to test defenses, and the more essential it becomes for exchanges to harden controls, publish clear standards and show they can detect, deter and punish illicit trading without chilling legitimate activity.

Sports tie-ups drew industry backlash

Partnerships with major leagues widened the aperture, inviting both fresh audiences and sharper criticism. The NHL inked multi-year deals with both platforms that allow use of league marks and exposure across broadcasts and tentpole events. As detailed in coverage of the NHL’s agreements with Kalshi and Polymarket, the American Gaming Association called the move deeply concerning, arguing leagues should not lend brands to firms that, in the AGA’s view, operate outside state-by-state sports betting regimes. Nevada regulators also reminded licensees that sports event contracts are treated like traditional wagers inside the state.

The pushback highlights a jurisdictional split: prediction markets sit under a federal derivatives framework while sportsbooks navigate state rules. As prediction markets expand into sports-adjacent propositions and seek broadcast reach, their compliance posture will face not just CFTC oversight but also reputational tests from traditional gaming stakeholders. Guardrails that restrict insiders and clarify manipulative conduct are not only legal risk mitigants but also table stakes for league and broadcaster comfort.

Regulatory green lights set the groundwork

Meanwhile, the regulatory landscape has shifted in ways that embolden growth but heighten accountability. Polymarket secured a path back to the United States through a no-action letter tied to its acquisition of a designated exchange and clearing house, a milestone described in reporting on the CFTC’s go-ahead for a U.S. relaunch. The move followed Kalshi’s courtroom win the prior year and came amid debate over whether these venues are sophisticated forecasting tools or, as critics put it, digital casinos. Either way, the regulatory nod brings these platforms further into the financial mainstream, which intensifies pressure to meet market-abuse standards familiar to futures venues.

That mainstreaming also reshapes who is at risk. Politicians, staffers, media producers, brand marketers, league employees and consultants can now find themselves covered by platform bans because their roles let them influence or foresee outcomes. Clearer integrity rules reduce ambiguity and make it easier to take action against violators. They also send a signal to policymakers that the sector is trying to self-correct as Congress weighs new curbs on event contracts, including those tethered to sports or political processes.

The path ahead

The latest restrictions are less a finish line than a checkpoint in a fast-scaling industry. The platforms are attempting to balance liquidity and price discovery with controls that resemble those in regulated futures markets. Recent controversies around advertising markets, league deals and alleged insider trades have made that balance harder to ignore. With record volumes, expanding partnerships and a clearer federal posture, the cost of failure rises. Expect more targeted participant bans, tighter listing standards for markets prone to foreknowledge and continued cooperation between exchanges and the CFTC. The prize is a durable license to operate. The risk is that one scandal resets the debate over whether prediction markets can responsibly turn information into tradable odds.