ChainCatcher report, according to Bloomberg, the resolution of disputed contracts on Polymarket is being dominated by a small number of UMA holders. Bloomberg’s data shows that among over 6,400 addresses that participated in dispute resolution voting on Polymarket over the past three years, just nine large wallets accounted for approximately half of all UMA voting power and sided with the winning outcome in nearly all disputes. In April 2026, around 230 contracts with total trading volumes exceeding $1 billion entered the dispute resolution process, representing less than 1% of all Polymarket contracts—but the frequency of disputes rises with trading volume. Some traders have criticized the mechanism for effectively granting anonymous whale operators economic incentives to determine “facts,” while plans originally promised by Polymarket and Risk Labs, the team behind UMA, to improve the process have been put on hold.
Bloomberg: 9 Whale Wallets Control Over Half of Polymarket’s Dispute Resolutions
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Summary
Whale activity on Polymarket has drawn attention as nine large wallets control over half of UMA’s voting power in dispute resolutions. Over 6,400 addresses have voted in the past three years, but the movements in these nine wallets consistently aligned with winning outcomes. In April 2026, 230 contracts with $10 billion in volume entered dispute resolution—less than 1% of total contracts. Critics argue the system grants whales de facto control, and plans to improve the process remain stalled.
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