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Biggest Polymarket upsets

Sample collected 2026-09-24 · price = 7 days before close

82 long shots came in: in our sample of 1,918 resolved markets, 1,413 outcomes were priced at 20% or less a week before close and 5.8% of them still happened, against an average price of 3.2%: long shots came in more often than those prices implied. The biggest surprise: What price will Bitcoin hit in August? (↑ 80,000 at 0.5%).

EventOutcome that wonPrice a week outClosedVolume
What price will Bitcoin hit in August?↑ 80,0000.5%2026-08-24$1.52M
Eurovision Winner 2026Bulgaria0.7%2026-05-17$6.73M
Nobel Peace Prize Winner 2025María Corina Machado0.9%2025-10-10$2.24M
What price will Bitcoin hit in August?↑ 77,5001.1%2026-08-21$834.3K
Elon Musk # tweets February 24 - March 3, 2026?200-2191.2%2026-03-03$1.56M
Khamenei out as Supreme Leader of Iran by February 28?Yes1.8%2026-03-04$131.11M
Elon Musk # tweets January 20 - January 27, 2026?380-3992.5%2026-01-27$1.66M
Military action against Iran ends?April 92.5%2026-04-13$237.5K
U.S. anti-cartel ground operation in Mexico by January 31?Yes2.5%2026-02-04$30.19M
Elon Musk # tweets December 30 - January 6, 2026?520-5392.5%2026-01-06$2.11M
What price will Bitcoin hit in August?↑ 75,0002.6%2026-08-21$1.06M
What price will Ethereum hit in January?↓ 2,4003.1%2026-01-31$1.70M
Elon Musk # tweets February 10 - February 17, 2026?240-2593.2%2026-02-17$1.42M
US x Iran permanent peace deal?June 153.7%2026-06-18$177.37M
2026 Women's Wimbledon WinnerLinda Nosková4.5%2026-07-11$620.7K
Elon Musk # tweets December 16 - December 23, 2025?340-3594.5%2025-12-23$1.32M
Canada vs. Qatar - More MarketsOver (O/U 5.5)4.9%2026-06-19$1.19M
Iran closes its airspace?June 85.1%2026-06-12$11.79M
#1 Searched Person on Google this year?d4vd5.2%2025-12-08$13.95M
US next strikes Iran?February 285.4%2026-03-04$5.84M
What day will the Lighter airdrop be?December 305.9%2025-12-30$5.24M
Elon Musk # tweets January 23 - January 30, 2026?380-3995.9%2026-01-30$1.29M
Russia x Ukraine ceasefire by May 31, 2026?Yes6.2%2026-05-09$141.25M
The Masters 2026: WinnerRory McIlroy6.5%2026-04-13$7.42M
Elon Musk # tweets January 16 - January 23, 2026?460-4796.5%2026-01-23$1.55M
Military action against Iran ends?April 136.5%2026-04-12$93.2K
What price will Bitcoin hit in January?↓ 80,0006.7%2026-01-31$6.75M
Netherlands Parliamentary ElectionD667.0%2025-11-02$5.98M
Spain vs. Cabo VerdeDraw (Spain vs. Cabo Verde)7.1%2026-06-15$4.40M
IEM Cologne Major 2026 WinnerFalcons7.5%2026-06-21$1.71M
Elon Musk # tweets January 13 - January 20, 2026?520-5397.5%2026-01-20$1.46M
Elon Musk # tweets December 12 - December 19, 2025?260-2797.5%2025-12-19$1.11M
What price will Bitcoin hit in August?↑ 72,5007.5%2026-08-20$1.03M
What price will Bitcoin hit in October?↓ 104k8.0%2025-10-10$437.5K
Military action against Iran ends?April 148.0%2026-04-13$127.0K
Military action against Iran ends?April 158.0%2026-04-13$101.5K
QatarEnergy announces/resumes LNG production in Qatar by April 30?Yes8.1%2026-05-05$25.50M
Tamil Nadu Legislative Assembly Election WinnerTVK8.8%2026-05-04$2.28M
NBA: LeBron James Next TeamPhiladelphia 76ers8.9%2026-07-27$3.83M
What price will Ethereum hit in January?↓ 2,8009.0%2026-01-25$1.54M

Same sample and method as the Polymarket accuracy study. A 10% price means traders saw roughly a one-in-ten chance; one in ten such outcomes should still happen. The table shows the 40 lowest-priced winners; markets about named people in criminal cases or deaths are counted in the numbers above but not listed. The full sample is in the CSV.

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