Key Takeaways:
Researchers from London Enterprise Faculty and Yale discovered solely 3.14% of Polymarket accounts qualify as expert, but generate most value discovery. Expert Polymarket merchants retained their classification 44% of the time out-of-sample, in comparison with simply 10% for expert mutual funds. The CFTC filed an insider buying and selling grievance on April 23, 2026 tied to a Polymarket contract on Nicolas Maduro’s removing from energy.
Examine Revealed to SSRN Covers 98,906 Occasions on Polymarket
The working paper, titled “ Prediction Market Accuracy: Crowd Knowledge or Knowledgeable Minority?” was revealed on April 20, 2026, on SSRN and revised on April 25, 2026. It was authored by Roberto Gomez-Cram, Yunhan Guo, and Howard Kung of London Enterprise Faculty, and Theis Ingerslev Jensen of Yale College.
The researchers analyzed the whole transaction historical past on Polymarket, the world’s largest prediction market by buying and selling quantity. The examine lined 98,906 occasions, 210,322 markets, and $13.76 billion in whole buying and selling quantity throughout 1.72 million accounts.
Utilizing a statistical technique referred to as a sign-randomization take a look at, the authors categorized merchants into distinct teams primarily based on whether or not their income mirrored real ability or random probability.
The findings lower in opposition to a extensively held assumption. Prediction market platforms, together with Kalshi and Polymarket itself, recurrently describe their accuracy because the product of collective intelligence from a various group of individuals. The examine immediately challenges that framing.
Solely 3.14% of Polymarket accounts certified as expert winners. These merchants earned persistent income that held up out of pattern, traded throughout a median of 79 markets every, and persistently positioned within the path of ultimate outcomes. The remaining 96% of accounts both broke even by luck or misplaced cash.
The authors discovered that expert merchants’ order movement predicted each next-period value modifications and last market outcomes at statistically vital ranges. A one-percentage-point enhance in expert web shopping for corresponded to an 8 foundation level enhance within the chance of the right last end result. Fortunate winners, regardless of posting constructive account balances, confirmed no significant predictive energy in both take a look at.
Polymarket‘s month-to-month buying and selling quantity climbed from $3.3 million in December 2023 to $1.98 billion in December 2025, a virtually 600-fold enhance over two years. Over the identical interval, energetic accounts expanded from roughly 1,600 to greater than 519,000. Regardless of that progress, the focus of ability remained slim.
The examine additionally examined ability persistence. Researchers cut up occasions randomly into coaching and take a look at units. Amongst merchants categorized as expert in coaching, 44% retained that classification within the take a look at set. For unskilled losers, 51% remained in that class. By comparability, expert mutual funds in a parallel take a look at retained their classification solely 10% of the time. The authors describe prediction markets as displaying unusually excessive persistence of each ability and anti-skill.
Expert merchants additionally responded first when scheduled information arrived. In checks protecting Federal Open Market Committee (FOMC) bulletins and company earnings releases, solely the expert group shifted its order imbalance within the path of the information shock inside a slim window round every launch. Different teams confirmed no constant response. The paper individually examined insider buying and selling.
Researchers recognized 1,950 accounts that met timing and conviction standards, suggesting they traded on personal data. These accounts averaged roughly $15,000 in income every and had giant value results after they did commerce. One documented case concerned three accounts that took positions in a contract tied to Venezuelan President Nicolas Maduro hours earlier than a secret U.S. army operation on Jan. 3, 2026, collectively incomes greater than $630,000.
On April 23, 2026, the Commodity Futures Buying and selling Fee (CFTC) filed a grievance alleging that an active-duty U.S. Military service member engaged in insider buying and selling utilizing a type of accounts. Regardless of these value results, the researchers concluded that insider exercise was too concentrated in remoted occasions to account for broad value discovery throughout the platform.
The vast majority of individuals, the examine discovered, funded accuracy moderately than produced it. Unfortunate and unskilled losers made up 67% of all accounts and absorbed everything of mixture losses. Market makers and expert takers collectively represented fewer than 3.5% of accounts however captured greater than 30% of whole beneficial properties.
The authors conclude that prediction market accuracy displays the conduct of a small, identifiable group of knowledgeable merchants whose participation is the mechanism behind value formation. Whether or not these merchants proceed collaborating as platforms develop and costs enhance stays an open query the paper leaves for future analysis.
