A college student lost $35,000 on Polymarket because of one missed deadline

Hunter Guo thought he had it figured out. The 20-year-old King’s College London student placed a bet on Polymarket that Strategy, the company formerly known as MicroStrategy, would sell Bitcoin by May 31, 2026. Strategy did sell Bitcoin. The announcement just came on June 1.

That one-day difference cost Guo roughly $35,000. And he wasn’t alone. Across 1,838 accounts, approximately $3.8 million in “yes” positions resolved to zero.

What actually happened

The bet was straightforward on its face: would Strategy sell Bitcoin by May 31, 2026? The company, which has become synonymous with corporate Bitcoin accumulation, did in fact sell some of its holdings. Strategy’s June 1 announcement covered sale activity from the prior week, meaning the actual selling happened before the deadline.

Here’s the thing. Polymarket didn’t care when the selling happened. The platform ruled that the announcement itself needed to land by 11:59 p.m. ET on May 31, 2026. The announcement dropped on June 1. Contract resolved to “no.” Positions went to zero.

For Guo and hundreds of other traders, the distinction between “when the event occurred” and “when the event was publicly announced” turned out to be worth millions.

The fine print problem

The core issue here is what traders believed they were betting on versus what the contract actually specified. Many participants interpreted the market as asking whether Strategy would sell Bitcoin during the time period. The contract’s resolution mechanism, however, hinged on when publicly verifiable information confirmed the sale.

This isn’t the first time Polymarket’s resolution process has frustrated traders. The platform has faced periodic complaints about how markets are settled, particularly when outcomes fall into gray areas. But the scale of this particular incident, $3.8 million across nearly 2,000 accounts, makes it one of the more significant resolution disputes the platform has dealt with.

Why prediction market risks are different

Prediction markets carry a specific category of risk that traditional financial markets don’t: resolution ambiguity. Prediction market positions can go to zero based on interpretive decisions about contract language.

In Guo’s case, the underlying event he was betting on actually happened. Strategy sold Bitcoin. The bet still resolved against him. That’s a fundamentally different kind of loss than simply being wrong about what would happen.

For now, the $3.8 million is gone. The traders who held “no” positions collected their winnings. And somewhere in London, a college student learned an expensive lesson about reading the fine print before putting five figures on a prediction market contract.