Polymarket CEO Defends Insider Trading in Markets, Calls Traditional Sportsbooks “A Scam”

During an interview with Axios business editor Dan Primack at the Axios BFD Summit in New York City on Tuesday, Polymarket founder Shayne Coplan made controversial statements regarding insider trading and the traditional sports betting industry. The executive suggested that insider trading serves as a market validation tool while characterizing established sportsbooks as operations that exploit their customer base.

Insider Trading as Market Validation

When questioned about Polymarket’s safeguards against insider trading, Coplan took an unexpected approach by defending the practice rather than outlining prevention measures. The discussion arose after Primack referenced Google CEO Sundar Pichai retweeting a market on the Gemini 3 release date, asking Coplan to explain the company’s integrity measures.

“Nobody is under the impression that nobody knows the answer, right? Like, of course, there’s people who are working on it that know when it’s going to come,” Coplan stated. “And I think what’s cool about Polymarket is that it creates this financial incentive for people to go and divulge the information to the market and the market to change, and all of a sudden it’s trading at 95 cents.”

The platform has faced previous accusations of insider trading, including markets related to air strikes in Israel. Coplan acknowledged that users should expect this activity on smaller markets, noting that participants are aware someone with insider knowledge may eventually enter these markets.

Coinbase CEO Brian Armstrong previously demonstrated how prediction markets can be manipulated when he recited specific words during the company’s earnings call that were the subject of active Polymarket and Kalshi markets.

Sports Betting Integrity Concerns

The conversation shifted to sports betting integrity following recent scandals in the NBA and MLB. Primack questioned whether Polymarket would maintain the same integrity monitoring standards as established operators like DraftKings and FanDuel when the platform relaunches in the US.

Coplan indicated the company has “some stuff in the works that will be a great improvement on what’s existing,” adding that the platform will comply with regulatory reporting requirements. However, the peer-to-peer model raises questions about incentive structures compared to traditional sportsbooks.

Traditional against-the-house operators are motivated to report suspicious betting activity that leads to their losses. Caesars Sportsbook flagged suspicious bets when Miami Heat player Terry Rozier exited a game early while playing for the Charlotte Hornets. The UFC called the FBI immediately after detecting suspicious betting patterns before Isaac Dulgarian’s fight with Yadier Del Valle.

The UFC has partnered with Polymarket, despite the American Gaming Association urging leagues not to endorse prediction market platforms. The AGA argues that regulation through the Commodity Futures Trading Commission remains insufficient, a concern echoed by the NBA and MLB in letters to the CFTC.

Sharp Criticism of Traditional Sportsbooks

Coplan delivered pointed criticism of established sports betting operators, claiming users can better detect insider knowledge through transparent market monitoring on prediction platforms compared to against-the-house models.

“They all rip off the consumer, respectfully. You can only trade against the house. They can ban you if you make money, and they can profile you as a user and change the prices based on you. That’s a scam. In traditional finance, that’s like a bucket shop. It’s a scam. Those are illegal.”

The Polymarket founder characterized the sports betting industry as a duopoly dominated by FanDuel and DraftKings, accusing these operators of lacking innovation.

Industry Response and Market Evolution

Major sportsbooks and daily fantasy sports operators are recognizing the commercial potential of prediction markets. DraftKings, FanDuel, Underdog, and PrizePicks have all established partnerships with CFTC-licensed exchanges.

PrizePicks initially announced a partnership with Polymarket but subsequently launched with Kalshi instead. FanDuel plans to launch through its CME partnership in early December, while DraftKings will introduce DraftKings Predictions by year-end following its acquisition of Railbird.

Both FanDuel and DraftKings recently departed from the American Gaming Association and exited Nevada operations due to regulatory oversight concerns as they prepare to launch prediction market offerings. The competitive race for liquidity raises questions about how integrity concerns will be prioritized across the industry.

Source: Axios BFD Summit