A Polymarket trader lost $5.8 million in a single day — a new anti-record in the platform's top losers.
Polymarket's analytical monitoring has recorded another dramatic addition to the list of the largest losing accounts. In 24 hours, a trader under the pseudonym supersob lost nearly $5.8 million, instantly catapulting him to third place in the platform's all-time anti-ranking. This case is a vivid illustration of how aggressive capital management in prediction markets can lead to complete fiasco.
The key losses came from bets during the group stage of the 2026 FIFA World Cup. The main blow was dealt by a wager on Belgium's victory over Iran — the match ended in a goalless draw, and the trader lost $3.12 million. This was followed by a bet against Norway in their game against Senegal. The Norwegians confidently won 3:2, taking $2.67 million from supersob, and an additional bet on a draw brought another $1.15 million in losses. The streak of failures was capped by a prediction of France's defeat to Iraq: the French crushed their opponent 3:0, and the trader lost another $1.53 million.
Before the fateful day, supersob's yield curve was steadily rising, peaking at $4 million in profit. However, within just a few hours on June 23, the indicators plummeted to a critical negative. Currently, the account's total negative balance stands at $6.86 million, with a trading volume of $16.73 million. Prediction accuracy is only 25% (only 3 out of 12 major bets turned out to be correct).
The top three in the anti-ranking also include the profile 10xBTClong with losses of about $10 million and jdsahgf with a deficit of $7.2 million. Below them are theRealTaylorSwift ($6.8 million), tubeyou ($5.5 million), and anoin123 ($5.4 million).
Why did this happen?
Polymarket's mechanics are ruthless: contracts trade in a range from $0 to $1, reflecting the mathematical probability of an event. The losing side loses all contributed funds. Large positions with incorrect analysis turn into a disaster. The supersob story is a classic example of how excessive overconfidence and lack of diversification lead to capital destruction.
My expert opinion: Prediction markets are not casinos, but complex tools requiring deep analysis and strict risk management. Losing $5.8 million in a day is not a coincidence, but a natural outcome of leveraged betting on events with high uncertainty. A lesson for all traders: even on platforms with transparent mechanics, emotions and greed can wipe out a multi-million dollar portfolio in a single day.