Key Highlights
- Polymarket faced a $10 million fraud attempt in February involving stolen debit cards and an 80% deposit rejection rate, prompting the resignation of its U.S. compliance chief and the firing of the U.S. division CEO and other compliance executives.
- Despite the fraud episode and ongoing CFTC investigations into potential insider trading on events including Biden pardons and Iran contracts, a Sullivan & Cromwell review concluded Polymarket complied with regulations, and the company says fraud rates normalized by May after adding controls and hiring former Amazon finance chief Warren Jenson as CFO.
- Prediction markets generated $63.5 billion in volume in 2025, with Polymarket and Kalshi handling $52.7 billion in the first 86 days of 2026, drawing heightened scrutiny from senators, JPMorgan, and the New York City Council over marketing practices and regulatory compliance.
Fraud Attempt Exposes Compliance Gaps at $21 Billion Valuation
In February, Polymarket became the target of a coordinated fraud attempt that sought to extract at least $10 million from its U.S. application, according to reporting by the Wall Street Journal. Attackers linked stolen debit cards to thousands of newly created accounts, placed wagers, and attempted to cash out to accounts they controlled. At the peak of the activity, more than 80% of deposits were rejected as fraudulent—a rate vastly exceeding the industry norm of roughly 1%. The bulk of the suspicious activity was traced to seven users, with one individual making nearly 4,000 deposits. The episode reached senior management quickly, and CEO Shaney Coplan reportedly instructed employees to proceed with business expansion plans regardless of any subsequent sanctions.
Leadership Shakeup and Internal Warnings
The fallout was immediate. Andrew Clifford, who oversaw compliance in the United States, resigned after publishing an internal report detailing the fraud issues. Justin Hertzberg, CEO of Polymarket’s U.S. division, was dismissed along with other executives responsible for regulatory compliance and anti-money-laundering policies. Some employees had warned that relaxing the rule requiring withdrawals to be sent back to the original funding source could increase money-laundering risk, but executives maintained that other internal controls were sufficient. A subsequent review by law firm Sullivan & Cromwell concluded that Polymarket had complied with applicable regulations.
Strengthened Controls and Ongoing Investigations
Polymarket says it has since bolstered its defenses. The company added risk personnel, including a former FBI agent, hired former Amazon finance chief Warren Jenson as its first chief financial officer, limited the number of debit-card users it could link, and engaged fraud-prevention firm Riskified. The company states that fraud rates returned to industry norms by May. However, the fraud episode is only one facet of mounting scrutiny. The New York Times reported that more than 80 Polymarket accounts have been flagged for questionable trading across nearly 30 subjects, including 13 users who wagered $140,000 on an Israeli military action against Iran and profited more than $600,000.
CFTC Probes Insider Trading Allegations and Market Integrity
Federal investigation activity has intensified. WIRED reported that Commodity Futures Trading Commission Chairman Michael Selig authorized investigations into trades made on Polymarket associated with Biden pardons, contracts with Iran, and Google’s search results. Additionally, a U.S. Special Forces soldier has been accused of using classified information to gain over $400,000 from bets related to Venezuelan President Nicolás Maduro. The CFTC has indicated that misuse of material nonpublic information could constitute a violation of commodities law. Blockchain analytics firm Chainalysis notes that the transparency of blockchain technology enables law enforcement to trace suspicious operations and investigate wallet connections.
Marketing Practices Draw Congressional and Banking Scrutiny
Polymarket’s promotional tactics have also attracted regulatory attention. A June 25 letter from Senators John Curtis and Adam Schiff asked the CFTC to investigate allegations that Polymarket paid creators to stage trades on lookalike websites without clearly disclosing the payments. The Wall Street Journal detailed how fake bets were promoted online. In August, JPMorgan closed Polymarket’s bank account over regulatory concerns, and the New York City Council opened a probe into prediction-market marketing practices.
Why This Matters
The stakes extend well beyond a single company. Prediction markets generated $63.5 billion in volume in 2025, while Kalshi and Polymarket together handled $52.7 billion in the first 86 days of 2026, according to Artemis. Intercontinental Exchange’s stake in Polymarket was valued at approximately $1.6 billion, representing roughly 22% of the company. Academic research underscores the systemic implications: a Stanford-SMU study found that Polymarket’s five-minute Bitcoin contracts were associated with settlement-time spikes in spot order flow and sharp price reversals, with retail traders absorbing most losses during manipulated cycles. The effect was far weaker in 15-minute contracts. For banks, regulators, and institutional traders, weak controls at major prediction-market platforms can raise the cost of entering the sector, fragment liquidity across jurisdictions, and slow the broader integration of prediction markets with crypto finance.
Frequently Asked Questions
Did Polymarket actually lose $10 million in the fraud attempt?
No. The $10 million figure represents the amount attackers attempted to steal using stolen debit cards. Polymarket’s systems rejected more than 80% of deposits as fraudulent at the peak, and the company states it did not lose the funds.
What regulatory actions are currently targeting Polymarket?
The CFTC has authorized investigations into trades linked to Biden pardons, Iran contracts, and Google search results. Senators Curtis and Schiff have requested a CFTC probe into undisclosed payments to creators for staged trades. JPMorgan closed Polymarket’s bank account, and the New York City Council is investigating prediction-market marketing practices.
How large is the prediction market sector, and who are the major players?
Prediction markets generated $63.5 billion in volume in 2025. Polymarket and Kalshi together processed $52.7 billion in the first 86 days of 2026. Intercontinental Exchange holds a stake in Polymarket valued at roughly $1.6 billion, representing about 22% of the company.
