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Polymarket faces insider trading concerns after Nobel Prize windfall

Hours before the Nobel Peace Prize committee announced Venezuelan opposition leader María Corina Machado as its 2025 laureate, a newly created Polymarket account quietly began making a series of long-shot bets. The account, named simply “6741,” wasn’t around for long — but by the time the announcement came, it had turned a 5% probability into a $50,000 windfall .

What looked like an uncanny prediction now has the crypto prediction market facing uncomfortable questions. Polymarket , a fast-growing, blockchain-based platform where users trade on real-world outcomes — from elections to celebrity engagements — doesn’t ban insider trading. In fact, as an offshore and unregulated marketplace, it legally doesn’t have to. That gray zone has become part of its allure — and its risk.

The Nobel incident wasn’t just a lucky bet. Within hours, Machado’s odds spiked from 5% to 70%, triggered by a buying spree in a thinly traded market. Other users noticed, piled in, and some walked away with tens of thousands in profit. On-chain data shows one trader nicknamed “GayPride” made more than $85,000 following the move.

For Polymarket, the timing couldn’t be worse — or better, depending on who’s watching. Earlier this week, Intercontinental ExchangeDealroom has a profile for this one. Try Dealroom →, the parent company of the New York Stock Exchange , announced plans to invest up to $2 billion , valuing Polymarket at $8 billion . The deal cements its rise from crypto curiosity to mainstream financial disruptor, even as events like this highlight how thin the line is between “market signal” and “leak.”

But Polymarket’s dominance is being tested. The company now faces mounting competition from regulated prediction platforms like Kalshi, which are expanding into sports and political markets under clear U.S. oversight. As prediction markets edge closer to the mainstream, Polymarket’s offshore model — long its advantage — could soon become its biggest constraint.

Founded in 2020, Polymarket has built a reputation for beating traditional pundits and capturing the mood of the internet. Yet the “6741” trade underscores a growing tension at the heart of its business: how long a platform built on transparency can thrive while operating in the shadows.

Source:

The Wall Street Journal

A.M.

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