George Santos under investigation for alleged insider trading on Kalshi

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The Backstory

Prediction markets’ insider trading test reaches politics

The reported scrutiny of George Santos’ Kalshi account brings prediction markets into a more familiar Washington problem: whether people close to an outcome can profit from information or influence not available to ordinary traders. The question is sharper because the market at issue was not a broad political forecast, but a contract tied to Santos’ own conduct: whether he would attend President Donald Trump’s State of the Union address.

Kalshi’s reported referral to federal authorities follows months of rising pressure on prediction platforms to show they can police trading that resembles insider dealing in securities or match-fixing concerns in sports betting. The platforms let users buy and sell contracts tied to real-world events, from elections and court rulings to sports results and public appearances. That growth has pushed them into territory that regulators, state lawmakers, sports leagues and gambling operators increasingly argue is vulnerable to manipulation.

For Kalshi, the Santos matter lands at a sensitive moment. The company has been expanding quickly and has overtaken its chief rival in activity. Recent reporting showed that Kalshi surpassed Polymarket in global trading volume, aided by its longer-standing U.S. operations and a valuation reported at $22 billion. Scale has strengthened Kalshi’s claim that it is building a regulated financial market rather than an offshore-style betting product. It also raises the stakes when suspicious trades emerge on politically sensitive contracts.

Guardrails arrived before the Santos report

Kalshi and Polymarket had already moved to tighten integrity rules before the Santos allegations became public. Both companies recently announced new limits on insider trading, acknowledging that prediction markets can be compromised when traders use confidential information or participate in markets they can affect.

Kalshi said it had introduced screening tools and guardrails intended to block politicians, athletes and other relevant figures from trading on certain markets. The company also said it was adding whistleblower functionality to market pages, allowing users to flag suspicious activity visible in public trading data. Polymarket separately updated its integrity rules to define prohibited conduct more clearly, including trading on stolen or confidential information, illegal tips or outcomes a trader can influence.

Those changes, covered in Kalshi and Polymarket’s new insider trading restrictions, signaled that the platforms understood the legal and reputational danger. They also suggested a reactive posture: the more prediction markets resemble venues for trading economically valuable information, the more they invite the same questions that surround securities markets, sports wagering and commodities exchanges.

Rep. Alexandria Ocasio-Cortez criticized Kalshi’s update as insufficient, arguing that policymakers, staff, advisers, consultants, Cabinet officials, spouses and others could trade on information unavailable to the public. Her response underscored a central weakness in narrow bans. Even if a platform blocks the person most visibly connected to an event, the information may still flow through aides, associates, family members or political networks.

The CFTC’s role has become harder to avoid

The Commodity Futures Trading Commission has tried to draw a distinction between regulated event contracts and state-regulated gambling. Chairman Michael Selig has argued that prediction markets and sportsbooks are “different products, parallel regimes,” a position that gives the CFTC a central role and limits state efforts to treat these markets as unlicensed betting.

That jurisdictional stance matters because Santos’ reported account activity is not merely a platform compliance issue. If a trader bets against his own public statement or uses private knowledge about his future actions, the conduct could test whether prediction market abuse falls squarely within the CFTC’s anti-fraud and anti-manipulation authority. Kalshi’s reported outreach to the Justice Department and, according to one source cited in the current article, the CFTC, suggests the company understood the matter could exceed routine platform discipline.

The CFTC had recently reaffirmed its authority to police prediction markets after Kalshi uncovered separate examples of problematic trading. In one case, a political candidate appeared to trade on a contract linked to his own career, leading to a $2,246 penalty and a five-year ban from the platform. In another, an editor connected to a YouTube channel traded on a market tied to that channel while allegedly holding inside information, resulting in a $20,397 penalty and a two-year suspension.

Those cases show the enforcement template now likely relevant to the Santos report: platform surveillance first, internal penalties where possible and escalation when the facts suggest broader misconduct. The CFTC has said it can police misappropriation of confidential information, prearranged noncompetitive trading, wash sales, fraud and manipulation. The unresolved issue is how aggressively it will use those powers as political and sports contracts become more mainstream.

Sports leagues exposed the same vulnerability

The insider trading debate has been especially intense around sports contracts, where team employees, agents, players, broadcasters and league officials may know information before the public. The NFL has been among the most forceful critics, warning prediction platforms to stop offering markets on events that can be influenced, predetermined or known in advance by insiders.

In letters to platforms such as Kalshi and Polymarket, the league cited markets tied to broadcast commentary, celebrity appearances, draft outcomes, player transactions, coaching changes, officiating decisions, injuries and fan safety issues. As reported in the NFL’s call for an end to insider trading on prediction markets, the league argued that such contracts could generate unwarranted allegations against players and staff while creating incentives for leaks.

The sports analogy is relevant to Santos because both categories involve asymmetric information and human discretion. A player’s injury status, a coach’s decision or a lawmaker’s attendance at a public event may appear to be a tradable fact. But if the answer depends on a small group of people who know or control the outcome, the market can shift from forecasting public probabilities to monetizing privileged access.

The CFTC has responded by seeking closer contact with sports leagues. Selig said the regulator had entered into a memorandum of understanding with Major League Baseball and was in talks with all major U.S. professional sports leagues, according to prior reporting on the agency liaising with leagues to prevent prediction market insider trading. That cooperation is designed to help identify suspicious trades and potential manipulation tied to sports-event contracts. A similar information-sharing model may become necessary in politics, though it would be harder to structure and more sensitive constitutionally and politically.

State fights and federal legislation raise the stakes

Kalshi’s legal and regulatory battles have broadened beyond insider trading. States have pushed back against prediction market operators, often arguing that sports-event contracts and similar offerings amount to gambling products that should be licensed, taxed and supervised locally. Kalshi has resisted that framing, relying on its status as a federally regulated exchange.

The company recently sued Minnesota after the state passed legislation blocking certain event contracts from being offered to residents. Pennsylvania lawmakers also introduced legislation that would impose oversight and taxes on prediction market operators, reflecting concerns about consumer protection, market integrity and insider betting. The Pennsylvania proposal is available through the state Legislature at HB 2497.

At the same time, the CFTC has supported Kalshi in legal fights where states attempted to regulate sports-event contracts as gambling. That backing strengthens the industry’s federal-law argument but also increases the burden on federal regulators to prove they can police misconduct effectively. If states are preempted or sidelined, the CFTC and platforms must show that surveillance, bans, penalties and referrals can protect market integrity.

Congress has also begun moving toward more explicit limits. Lawmakers have introduced proposals aimed at curbing sports betting on prediction markets and tightening controls on insider trading. Those efforts reflect bipartisan discomfort with contracts that may be technically financial derivatives but function for many consumers like wagers on politics, sports and entertainment.

Why the Santos case matters beyond Santos

Santos is an unusually high-profile test case because of his political notoriety and the apparent simplicity of the underlying market. A contract on whether a former member of Congress would attend a major presidential address is easy for retail traders to understand. It is also exactly the kind of market where the subject may possess decisive information before anyone else.

If federal authorities conclude there was no violation, prediction platforms will still face pressure to explain how such contracts are designed, monitored and restricted. If investigators find evidence of improper trading, the case could become a defining example for why political figures and associated insiders should be barred from many event contracts outright.

Either outcome feeds the same broader question: whether prediction markets can scale without becoming venues for monetizing nonpublic information. Kalshi’s growth, Polymarket’s return to the U.S. and the CFTC’s defense of the sector have moved event contracts closer to the financial mainstream. The Santos allegations show that market integrity, not just market legality, may determine how far that expansion can go.