Why Almost Everyone Loses—Except a Few Sharks—on Prediction Markets
A WSJ analysis shows a small number of accounts on Polymarket and Kalshi—often pros using data-driven algorithmic trading—take home most of the winnings
John Pederson, 33, couldn’t work. The former Outback Steakhouse line cook was recovering from a car crash and running out of money. Kalshi, the prediction market, promised a quick way to fix that. He took out a variable-interest loan and started betting.
Related Knowledge Center: Prediction markets
Platforms are offering a way for users trade positions — place bets — on a wide range of possible events, and newsrooms are starting to incorporate the data.
As the business rapidly grows, critics and opponents are pushing back. Numerous states have argued that the markets are gambling, and sports gambling in particular is regulated by the state. The Commodity Futures Trading Commission, now led by a Trump appointee, disagrees — as did a federal district court judge in a suit involving New Jersey.
Critics see some of the markets as, particularly in the case of military actions, indefensible, and note as well that some large, well-timed bets — “event contracts” — suggest an abuse of insider knowledge of federal actions.