A Polymarket trader lost $11.6 million across a 10-day World Cup betting run, turning one of the tournament’s highest-profile prediction-market accounts into a case study in concentrated event risk.
The account, trading under the name coldsway, placed 15 World Cup bets and lost 11 of them, leaving a 26.7% win rate across the stretch. The largest single losing position reached nearly $5 million, according to the trade summary flagged by Lookonchain.
The Polymarket profile shows 15 predictions and a biggest win of $1.1 million, but the closed World Cup run was dominated by downside. The account’s current positions value was listed at $0 at the time the profile was viewed, leaving the reported losses tied to resolved or closed event contracts rather than an active open position.
The run shows how quickly World Cup markets can punish size when traders stack exposure across correlated outcomes. A team result, spread market or match-level contract can settle cleanly in minutes, but large positions leave little room for recovery when several outcomes break the wrong way in a short window.
World Cup Bets Keep Producing Whale-Sized Swings
The loss follows a run of large World Cup wins and wipeouts on Polymarket, where match outcomes have become one of the busiest corners of the prediction-market cycle.
Earlier in the tournament, one Polymarket trader collected $9.24 million after four World Cup positions settled in the money. Another account using the name blunttedge made $8.47 million in one day after Sweden-Japan and Ecuador-Germany bets paid out.
Those wins helped turn World Cup trading into a public leaderboard of high-conviction sports positions. The coldsway loss cuts the other way, showing the same market structure can erase eight figures when outcomes fail to line up.
Prediction-market contracts settle around defined results rather than price charts. That gives traders a cleaner payout structure, but it also creates binary downside. If the chosen outcome fails, the position can go to zero, regardless of how close the match was or how strong the pre-game market looked.
Sports Markets Draw More Scrutiny
The size of the loss lands as sports prediction markets remain under legal and regulatory pressure in the U.S. Kentucky recently targeted Kalshi and Polymarket in illegal sportsbook lawsuits, accusing the platforms of offering sports event contracts without the state licenses and consumer protections required for betting products.
The lawsuits focus on the same category that has powered much of the World Cup trading boom: game winners, spreads, player stats and other sports-linked outcomes. The legal fight is separate from individual trader losses, but both stories are now feeding the same policy debate over whether sports event contracts should be treated as prediction-market products or gambling activity.
Polymarket’s international platform is not regulated by the CFTC, while Polymarket US is operated separately through QCX LLC, a CFTC-regulated Designated Contract Market. The international platform’s terms warn that trading involves substantial risk of loss, a point that becomes harder to ignore when a single World Cup account can lose $11.6 million in 10 days.
The coldsway profile lists 15 predictions and a $1.1 million biggest win, while the Lookonchain-tracked World Cup run shows $11.6 million in losses, 11 losing bets and a largest single loss of nearly $5 million.
