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A report published July 31 describes an increasingly bitter feud between prediction-market operators Polymarket and Kalshi, with allegations of personal rumor-spreading, public insults and lingering fallout from earlier regulatory scrutiny.
According to the report, Polymarket CEO Shayne Coplan allegedly spread an unsubstantiated rumor about Kalshi CEO Tarek Mansour and Kalshi co-founder Luana Lopes Lara. A Kalshi spokeswoman denied the claim and accused Coplan of "spreading lies." A Polymarket spokesman, meanwhile, denied that Coplan had spread rumors about Kalshi’s co-founders and said Kalshi had helped stoke tensions between the companies.
The article also says Coplan referred to Mansour as "Little Tarek" and described Kalshi in derogatory terms, while portraying both executives as engaged in public and private sniping as their businesses compete for share in the fast-growing prediction-markets space.
For players and industry watchers, the significance is less about the gossip itself than what it says about a market still defined by aggressive competition and regulatory sensitivity. Both companies offer markets on topics including sports, weather, entertainment and celebrity breakups, but they have taken different public positions on compliance and industry image.
The report revisits a November 2024 FBI raid on Coplan’s apartment, during which electronic devices were seized. Coplan was not arrested or charged, according to the article. It also recounts claims that Kalshi had tipped off federal authorities ahead of that raid, though the source does not provide fuller details of the underlying investigation.
Another flashpoint involved Donald Trump Jr. The article says he joined Kalshi as a strategic adviser in early 2025 and later joined Polymarket as an adviser in August, around the time Polymarket also received a strategic investment from 1789 Capital.
Some details in the report remain disputed or unverified, including whether Coplan actually spread the rumor at the center of the story. Still, the piece underscores how personal hostility between two high-profile executives is now colliding with larger questions around reputation, oversight and the future positioning of prediction-market platforms in the U.S.
What to watch next is not a formal court date or regulatory deadline, but whether either company faces new official scrutiny, offers further public responses, or turns the rivalry into broader legal or reputational action.
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Source: As reported by Marc Vartabedian.
