Key Highlights

  • A Polymarket market asking whether Strategy would sell Bitcoin "by May 31" has resolved "No" twice and been challenged twice, despite Strategy disclosing on June 1 that it sold 32 BTC between May 26 and May 31 at an average price of $77,135, generating approximately $2.5 million.

  • Critics accuse Polymarket of retroactive rule changes after it updated the market's context post-dispute to stress that post-deadline confirmations do not qualify, while one affected trader publicly claimed losses of $500,000.

  • The dispute has escalated to a UMA token-holder vote, raising conflict-of-interest concerns after an investigation found that at least 60% of active UMA voters could be linked to live Polymarket accounts and roughly one in five disputes had a voter with a direct financial stake in the outcome.

Polymarket is facing significant user backlash over a market asking whether Strategy would sell any Bitcoin "by 11:59 PM ET on May 31, 2026." The dispute centers on a timing gap: Strategy disclosed in a June 1 SEC filing that it had sold 32 BTC between May 26 and May 31 at an average price of $77,135 per coin, generating roughly $2.5 million. The sale occurred within the deadline, but the company's confirmation of it came one day after. The market has resolved "No" twice, with both outcomes subsequently challenged by bettors who placed positions on "Yes."

The backlash focuses on two issues. First, bettors argue that the market should resolve based on when the transaction occurred, not when it was disclosed, and that resolving "No" despite confirmed on-chain or regulatory evidence of a sale within the window misrepresents the event. Second, critics have accused Polymarket of retroactive rule changes: following the dispute, the platform updated the market's context note to stress that post-deadline confirmations do not qualify, a clarification that was not present when bets were placed. One trader, posting as willo2 on X, claimed he lost $500,000 after placing large "Yes" positions on June 1 in reliance on a still-open market.

The dispute has escalated to UMA token-holder arbitration, the final-stage resolution mechanism Polymarket uses for contested outcomes. UMA tokenholders vote on disputed resolutions, but the process has drawn scrutiny over potential conflicts of interest. A recent investigation found that in the majority of disputed Polymarket markets, at least 60% of active UMA voters could be linked to live Polymarket accounts, and roughly one in five disputes had at least one voter with a direct financial stake in the contract they were ruling on.

The Strategy dispute has become a test case for how prediction markets handle the boundary between event timing and event disclosure, a question with no clean answer under existing resolution frameworks. The outcome of the UMA vote will determine whether the considerable sums bet on "Yes" are recovered or lost, and will set a precedent for how similarly structured markets are resolved going forward. The case adds to a growing body of criticism around Polymarket's oracle and dispute resolution design at a moment when the platform is under heightened regulatory attention.