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

NYTimes Technology • Sun, 19 Jul 2026

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

Shayne Coplan of Polymarket and Tarek Mansour of Kalshi are young billionaires intent on dominating prediction markets. It’s more than a battle. It’s “bad blood.”

What happened?

Shayne Coplan of Polymarket and Tarek Mansour of Kalshi are young billionaires intent on dominating prediction markets. It’s more than a battle. It’s “bad blood.”

Story details

Shayne Coplan of Polymarket and Tarek Mansour of Kalshi are young billionaires intent on dominating prediction markets.

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Original source

https://www.nytimes.com/2026/07/19/technology/polymarket-kalshi-rivalry-coplan-mansour.html