Prediction markets have delivered some of the most striking forecasting calls of the modern era, often beating pollsters, pundits, and professional analysts by wide margins. Looking back at the biggest hits is not just entertaining history. It is the best way to understand what prediction markets actually do well and where the real edge lives. Here are the ten biggest prediction market wins of all time, ranked by a combination of forecasting difficulty, information lead over conventional sources, and the sheer size of the money that moved on the call.
1. Trump Wins the 2016 Republican Primary
In the summer of 2015, almost every political analyst in America rated Donald Trump a joke candidate. The New York Times famously assigned him a 2 percent chance of becoming the nominee. Betfair’s prediction market, by contrast, had Trump climbing steadily from 10 percent in July 2015 to a dominant 65 percent by March 2016. The market saw what the commentariat refused to: a candidate who dominated earned media and polled first in a fragmented field was the structural favorite. Traders who held Trump contracts from the autumn of 2015 earned returns north of 500 percent.
2. The 2024 Trump Comeback Call
Heading into Election Day 2024, final polling averages had Kamala Harris ahead by roughly one point and the race rated a toss-up. Prediction markets told a very different story. Polymarket’s Trump price never dropped below 55 percent in the final week and peaked above 65 percent on election day itself, while Kalshi settled at 58 percent. The result, a clear Trump victory with margin in the popular vote, vindicated the markets and generated a wave of mainstream coverage questioning why polling had become so unreliable. Several of the largest Polymarket wallets cleared eight-figure profits.
3. Brexit Is Coming (The Early Signal)
Most people remember the 2016 Brexit vote as a prediction market miss, because the final morning price gave Remain an 85 percent chance. What is often forgotten is the earlier signal: in the three months before the vote, the Leave contract traded consistently between 28 and 42 percent at a time when bookmakers and pundits treated Brexit as a near impossibility. Smart traders who built Leave positions during the spring and held through the chaos cleared 2 to 3x returns, and the misread of the final morning price is now a classic lesson in liquidity-driven mispricing.
4. COVID-19 Lockdowns in March 2020
In the first week of March 2020, as US cases were still measured in the hundreds, prediction markets on PredictIt and private corporate platforms were already pricing a greater than 70 percent chance of a federal state of emergency and a greater than 80 percent chance of major sports league shutdowns within thirty days. Both resolved true within two weeks. The markets effectively front-ran the US government by about ten days on one of the most consequential forecasts of the century.
5. The Fed Pivot of 2024
Throughout mid-2024, the Federal Reserve maintained hawkish rhetoric that pointed to rates staying higher for longer. Kalshi’s rate-cut markets diverged sharply from Fed speak, pricing a greater than 70 percent chance of a cut by September. The cut came on September 18, 2024, and was larger than most analysts expected. Traders who built positions against the hawkish consensus cleared the market’s biggest macro win of the year.
6. Macron’s 2017 Victory from Nowhere
In early 2017, Emmanuel Macron was a political unknown running on a brand-new centrist platform against Marine Le Pen’s National Front. European pollsters gave him roughly a 55 percent chance in the second round. Betfair and Smarkets had him at 78 to 82 percent as early as April. Macron won by a 32-point margin. The market priced the structural advantage of a unified anti-Le Pen coalition long before polling caught up to it.
7. Biden Over Sanders, 2020 Super Tuesday
After losing the Iowa, New Hampshire, and Nevada contests, Joe Biden’s primary odds on PredictIt cratered to 15 percent on the morning of the South Carolina primary. Smart money flooded in during the two hours after Jim Clyburn’s endorsement. By the time Biden won South Carolina that night, the market had already repriced him to 55 percent. Twenty-four hours later, after Buttigieg and Klobuchar dropped out, he was above 70 percent. Traders who read the endorsement signal before the result cleared 4 to 5x in a single news cycle.
8. The 2022 Midterm Red Wave That Wasn’t
Heading into the November 2022 midterms, almost every major forecasting outlet predicted a decisive Republican wave. Final models from 538 and The Economist had the GOP’s chance of taking the Senate between 55 and 65 percent. Kalshi and PredictIt traders pushed back, pricing Senate Republican control at 40 to 45 percent in the final week. The Senate stayed Democratic, Pennsylvania, Nevada, and Arizona all broke left, and the prediction markets outperformed every major polling aggregator for the cycle.
9. Bitcoin Crosses 100,000 in 2024
In the summer of 2024, with Bitcoin trading in the 60,000s, Polymarket contracts on Bitcoin crossing 100,000 by year-end traded between 18 and 25 percent. Mainstream analyst targets were far lower. Bitcoin crossed 100,000 in early December. Traders who accumulated yes contracts during the summer dip earned 4 to 5x returns on a call that few traditional finance desks were willing to make publicly.
10. Zelensky Refuses to Flee (February 2022)
In the first 48 hours of the Russian invasion of Ukraine, media reports widely suggested that President Volodymyr Zelensky would evacuate Kyiv. Prediction markets on Insight Prediction and Polymarket priced his survival in office at the end of March at 70 to 80 percent while the mainstream framing was existential. The markets were right. Zelensky remained in Kyiv, Ukraine mounted a successful defense of the capital, and the resistance reshaped the war’s trajectory.
What the Biggest Wins Have in Common
Looking across these ten calls, three patterns stand out. Readers can use them to spot the next big win while it is still forming.
- The crowd beat the pundits when the pundits were constrained by professional incentives. Pollsters, Fed watchers, and mainstream analysts often cannot publicly endorse a contrarian view, even when their private models agree. Prediction market traders have no such constraint.
- The biggest wins were visible months in advance, not minutes. Trump 2016, Brexit’s rise, Macron’s dominance, and Bitcoin 100k were all priced correctly long before the consensus caught up. The pattern was slow, not sudden.
- Markets front-ran events, not just elections. Three of the ten biggest wins are macro or geopolitical, not political. As Kalshi and Polymarket add deeper markets on rates, inflation, and global events, this category is likely to dominate future rankings.
How to Catch the Next Big Win
The most consistent way to find the next generational prediction market win is to pay attention when the market disagrees with the consensus by 10 points or more. Those are the moments when one side is clearly wrong, and the historical record suggests that side is more often the pundits than the traders. Our ranking of the best prediction markets of 2026 covers which platforms carry the deepest liquidity in political, macro, and crypto markets, so you can find the dislocation that matches your edge.
To start trading the markets that will anchor the next list, open an account with Kalshi for CFTC-regulated US event contracts or Polymarket for global political, crypto, and macro contracts. The best time to be in the market is before the consensus catches up, and the only way to be there is to already be trading.