A Polymarket trader has collected $9.24 million in profit during the 2026 FIFA World Cup, in one of the clearest signs yet of how big these event markets have become. This wasn’t one wild long-shot ticket. It was a book built across related positions, including a key win on the Iran - New Zealand match and added exposure across World Cup outcome markets.
That distinction matters, because it means traders are no longer just taking isolated punts on a single result. Around major global events, they can build portfolios of event risk across several contracts, then realize gains and losses as results come in. In this case, one trader reportedly made $9.24 million, while another reportedly lost $4.2 million, with a separate $1 million loss on a Spain World Cup market.
Sports-event prediction markets are starting to behave less like casual betting pools and more like professional trading books, with enough depth for multi-million-dollar risk to be built and unwound quickly when the world is watching.