[Approximately $200 Million in Potential Insider Trading Flagged on Polymarket in the First Half of the Year] BlockBeats News, July 21: According to a Bloomberg report, as prediction markets like Polymarket and Kalshi expand, the issue of betting using non-public information or informational advantages is coming under increased scrutiny. Bloomberg Businessweek analyzed approximately 34,000 potential insider trades flagged by Polysights between August 2025 and June 2026. These trades exhibited characteristics such as newly created accounts, low-probability entries, large bets, or high transaction concentration, but these traits alone are insufficient to confirm rule violations. Data shows that from January 1 to June 30 this year, the total value of suspicious transactions flagged on Polymarket was approximately $200 million, with geopolitical and war-related markets driving a significant increase in abnormal trading volume. Profits from potential insider trading were highly concentrated, with the top 1% of profitable wallets accounting for more than half of the gains. Additionally, 57% of the related wallets were created less than 24 hours before the transactions. Some traders are reportedly using multiple linked wallets and splitting orders to reduce the likelihood of detection. For example, 38 linked addresses placed bets in 90 geopolitical markets related to Iran and Venezuela, achieving a win rate of 98%, with total profits of $1.6 million. These funds were withdrawn using the same Coinbase deposit address. Polymarket stated that it monitors insider trading and other illegal activities and has so far referred nearly 100 wallets to law enforcement agencies. Kalshi has also strengthened its review of identity and employment information and has restricted participation in relevant markets by individuals such as political candidates and athletes who could influence outcomes. [Original Link]