Polymarket Flags $200M in Suspicious Trades, Refers Nearly 100 Wallets to Authorities

Polymarket has referred nearly 100 cryptocurrency wallets to law enforcement as it ramps up efforts to combat suspected insider trading and market manipulation, according to a new Bloomberg investigation.

The report, citing data from blockchain analytics platform Polysights, found that roughly $200 million worth of trades during the first half of 2026 exhibited characteristics commonly associated with potential insider activity.

Bloomberg’s analysis indicates that many of the flagged trades centered on fast-moving geopolitical events, particularly markets related to Iran and Venezuela. While the report does not conclude that illegal insider trading occurred, it highlights repeated patterns in which traders appeared to take highly concentrated positions shortly before market-moving developments became public.

Geopolitical Markets Under the Microscope

According to Bloomberg, Polymarket has significantly expanded its surveillance capabilities in recent months as prediction markets attract greater attention from regulators and institutional participants. The company has confirmed that more than 90 suspicious wallets have been referred to law enforcement while information on more than 315 wallets has been shared with investigators during ongoing inquiries.

The report notes that the largest concentration of unusual trading activity occurred in markets tied to geopolitical developments, where sudden government announcements, military actions, or diplomatic decisions can rapidly change market probabilities. In several instances, wallets reportedly placed large bets shortly before news became public, raising questions about whether some participants may have had access to non-public information.

Importantly, unusual trading patterns alone do not prove wrongdoing. Some traders may simply possess superior analytical models or make high-conviction bets based on publicly available information.

Stronger Oversight as Prediction Markets Grow

The latest findings come just months after Polymarket announced a partnership with Chainalysis to deploy new detection tools designed specifically to identify trading patterns consistent with insider knowledge. The company has also expanded its compliance infrastructure by working with external technology providers to improve market surveillance and preserve evidence for regulators when suspicious activity is detected.

The increased scrutiny follows several high-profile investigations involving prediction markets this year, including criminal charges against a Google engineer accused of using confidential company information to profit from trades on Polymarket. The case underscored growing regulatory interest in whether traditional insider trading principles can apply to event-based prediction markets.

As prediction markets continue expanding into politics, sports, finance, and global events, the effectiveness of these new surveillance measures will likely play a key role in shaping the industry’s credibility with regulators and mainstream participants.