The alleged $400,000 insider bet by a Green Beret on a Venezuela raid initially appeared to be an isolated incident. However, a recent report by the Anti-Corruption Data Collective (ACDC) suggests that this may be just the tip of the iceberg.
The nonprofit research group analyzed over 435,000 Polymarket contracts from January 2021 to mid-March 2026, with a cumulative volume of $54.4 billion, and found that low-probability bets on military and defense outcomes have success rates that are difficult to explain by skill or luck alone. Typically, such 'longshot' bets succeed around 14% of the time across political markets, but in military-linked contracts, success rates have exceeded 50% in some cases. The authors of the report noted that markets related to government policies, such as military and defense, are harder to forecast using public information, making them more susceptible to information asymmetries, including insider trading or specialized knowledge. This creates an environment where a small group of traders can consistently outperform others, not just by reacting faster, but by possessing more information.
Polymarket has emphasized its market surveillance teams and cooperation with the Department of Justice on the Venezuela case, as trading on confidential knowledge is prohibited on the platform. The ACDC report's findings add to existing research indicating that a small group of traders accounts for most price discovery on Polymarket. A working paper from London Business School and Yale found that roughly 3% of traders drive prices, while separate analysis from Solidus Labs showed that fewer than 1% of wallets capture about half of all gains.
The report examines the June 2025 U.S. strikes on Iran as a case study, where 19 longshot bets totaling $164,292 were placed across contracts that ultimately resolved YES, with eight wallets sharing about $1.8 million in profits.
The pattern of well-timed bets extends beyond this single event, with winning longshot bets outnumbering losing ones in five of the six two-hour windows before market resolution, contrary to what market prices imply. While longshot bets can outperform due to other factors, such as mispricing or shifts in public expectations, the consistency of the patterns, especially in markets tied to military decisions, suggests that some participants may be operating with information advantages. The ACDC's recommendations include identity verification for bettors, conditional payouts on suspicious wagers, restrictions on markets whose outcomes are decided by small groups, and limits on contract granularity. The report concludes by calling for an evidence-informed debate about whether the public should be betting on these outcomes at all.