Why Almost Everyone Loses—Except a Few Sharks—on Prediction Markets

May 4, 2026 - 04:28

A new analysis from the Wall Street Journal reveals a stark reality for participants in prediction markets like Polymarket and Kalshi: the vast majority of users lose money, while a tiny fraction of sophisticated traders walk away with nearly all the profits. The study found that a small number of accounts-often run by professional traders using algorithmic, data-driven strategies-consistently dominate the winnings. These "sharks" leverage speed, advanced modeling, and access to real-time information to outmaneuver casual bettors who rely on gut feelings or news headlines.

The pattern mirrors traditional financial markets, where retail investors frequently get burned by more experienced players. On platforms that allow betting on everything from election outcomes to Federal Reserve rate decisions, the house edge and fees further erode amateur returns. The analysis suggests that for every big winner, dozens of smaller accounts are left holding worthless contracts. While prediction markets are often touted as tools for aggregating wisdom and forecasting events, the data indicates they primarily serve as a wealth transfer mechanism from the many to the few. For the average user, the odds of coming out ahead are slim, and the lure of quick profits often masks the reality of systematic losses.