Prediction-market activity expands sharply during the World Cup, reaching roughly 27% of sports bets, according to reporting that compares the growth to traditional sportsbook wagering. Multiple outlets describe trading as surging during games with lopsided results, with volumes and participation increasing faster than at mainstream bookmakers. Kalshi, identified as the largest prediction-market platform, is repeatedly breaking its own trading records throughout the tournament. The coverage characterizes prediction markets as taking a larger share of betting activity, suggesting intensified competition for sports-gambling firms that primarily rely on traditional sportsbooks. While sportsbooks continue to operate, the data points cited focus on the relative share and momentum of prediction-market trading during the event. The outlets collectively frame the trend as a measurable shift in how some bettors engage with World Cup outcomes, driven by rapid growth in prediction-market platforms and record-high performance at the leading provider.