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The ‘Bad Blood’ Between Polymarket’s Shayne Coplan and Kalshi’s Tarek Mansour

NYT > Business·July 19, 2026
The ‘Bad Blood’ Between Polymarket’s Shayne Coplan and Kalshi’s Tarek Mansour

Shayne Coplan and Tarek Mansour, young billionaires behind Polymarket and Kalshi, respectively, are engaged in a fierce competition to dominate the prediction markets. Their rivalry has escalated into a personal feud, characterized as "bad blood" between the two entrepreneurs. Coplan and Mansour are each determined to outmaneuver the other and establish their platform as the leading destination for prediction markets. The intense competition between them is driven by their ambition to succeed in this emerging industry.

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