Polymarket, Kalshi Surprise Markets After Lula Wins Brazil Runoff at 20% Odds
Polymarket resolved to Lula after $249m+ volume; Kalshi saw rapid swings and heavy trade activity.
Key Takeaways
- Polymarket's Brazil election market drew more than $249 million in total volume and resolved for Lula.
- The Superior Electoral Court reported Lula at 51.8% and Bolsonaro at 48.2%, a margin of nearly 4.4 million votes.
- Kalshi showed Bolsonaro trading at over 80% for two days before price collapsed to 31% as Lula rose to 70%.
- A Rio Times analysis found Polymarket's order book thin enough that $30,000 of selling would have cut Bolsonaro's price by five points at 5:15 p.m. ET.
- The U.S.-listed EWZ fund fell nearly 20% overnight amid the result; Bolsonaro is contesting the outcome.
Polymarket and Kalshi showed Luiz Inácio Lula da Silva at roughly 20% odds before his upset victory in Brazil's runoff on Sunday, 26 October 2026; by the evening both markets swung decisively as official counts favoured Lula. The Superior Electoral Court reported 51.8% of valid votes for Lula and 48.2% for Jair Bolsonaro, with a final margin of nearly 4.4 million votes, the Associated Press reported. Lula will begin his new term on 5 January 2027, AP added.
How the prediction markets moved
Polymarket's Brazil election market drew more than $249 million in total volume and has since resolved in Lula's favour. Polymarket's order book was thin enough that, according to the Rio Times, about $30,000 of selling would have cut five points from Bolsonaro's price at 5:15 p.m. ET, and prices on the platform moved 30 to 40 minutes ahead of the visible vote count.
Kalshi displayed extreme short-term concentration. Michael McDonough summarised trading on X that Bolsonaro “traded at 80%+ for two days,” before “Lula went from 20% to 70% and Bolsonaro collapsed to 31%, on the heaviest volume of the market's life.”
“Lula went from 20% to 70% and Bolsonaro collapsed to 31%, on the heaviest volume of the market's life,” Michael McDonough on X.
Market context and reactions
Prediction markets are banned in Brazil itself, limiting domestic participation. Runoff opinion polls compiled by the Rio Times had given Bolsonaro about 51% of the vote, a much narrower edge than markets implied. Commentary on X framed the result as either a major market error or a variance event: Joe Weisenthal asked whether this was “one of the biggest prediction market whiffs of all time,” Harry Crane noted the rarity of a longshot victory, and Nic Carter asked whether the outcome represented normal variance that happens “one in every five times.”
Brazilian financial markets reacted alongside markets: the U.S.-listed EWZ fund was down nearly 20% overnight, CNBC reported. Bolsonaro has refused to concede and said he would seek annulment of the result, pointing to a late Supreme Court justice ruling that kept polls open two extra hours. The legal challenge is pending.
“Normal variance that happens one in every five times,” Nic Carter on X.
Frequently Asked Questions
How much volume did Polymarket's Brazil market attract?
Polymarket's Brazil election market drew more than $249 million in total volume, and the market has since resolved in Lula's favour.
What were the official Brazil runoff results?
The Superior Electoral Court reported Lula on 51.8% of valid votes and Bolsonaro on 48.2%, with a final margin of nearly 4.4 million votes.
How did Kalshi's prices change during the count?
Kalshi showed Bolsonaro trading at over 80% for two days before Lula rose from 20% to 70% and Bolsonaro fell to 31% on the heaviest trading volume of the market's life.
Did polls predict the same outcome as prediction markets?
No; runoff polls compiled by the Rio Times gave Bolsonaro about 51% of the vote, a much narrower edge than the markets indicated.
Is betting on prediction markets legal in Brazil?
No; prediction markets are banned in Brazil, which restricts domestic participation in platforms such as Polymarket and Kalshi.
Tags
About the author
Tessa Coleman
Betting Markets Correspondent
Tessa Coleman covers betting products and markets — sportsbook launches, odds and trading technology, and the fast-growing prediction-market space from regulated exchanges to event contracts. The stories lead with the product or the ruling, name the operators and platforms precisely, and translate trading jargon into what bettors can actually do. When a book reworks its pricing or a prediction market wins a license fight, Tessa Coleman explains the mechanics and the stakes.
More from Tessa Coleman
