Yale study finds 3% of Polymarket traders capture 27% of all profits
A Yale study published September 14 found that 3% of traders on Polymarket capture 27% of all profits on the CFTC-registered prediction market platform. The research highlights significant concentration of returns among a small subset of active participants. Both sources agree on the headline figures: a tiny fraction of accounts books more than a quarter of total platform profits, suggesting sharp inequality in trader performance.
The study gives retail traders a concrete reason to rethink their edge on Polymarket. If a single-digit percentage of accounts sweeps more than a quarter of profits, the median participant is structurally behind. Polymarket now faces pressure to disclose whether that concentration stems from superior information, algorithmic execution, or simply higher volume. Competitors like Kalshi and ForecastEx can use the paper to argue their own markets are less top-heavy, potentially drawing traders who fear being outgunned.
For regulators, the finding raises questions about fair access without mandating any specific rule. The sharper risk is reputational: a platform branded as winner-take-most may struggle to retain casual users who subsidize the core experience. Yale's second Polymarket study in under two weeks builds on prior work examining how claim unbundling affects investor behavior, suggesting a sustained research program rather than an isolated finding.