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

- Published: 2026-07-19T09:00:24Z
- Updated: 2026-07-19T22:57:53Z
- Section: Technology
- Language: English (en)
- Source: The New York Times — https://www.nytimes.com/2026/07/19/technology/polymarket-kalshi-rivalry-coplan-mansour.html
- Tags: The New York Times · Technology
- Canonical: https://www.khabarestan.com/en/news/%D8%B1%D9%82%D8%A7%D8%A8%D8%AA-%D8%B4%D8%AF%DB%8C%D8%AF-%D8%A8%DB%8C%D9%86-%D9%BE%D9%84%DB%8C%D9%85%D8%A7%D8%B1%DA%A9%D8%AA-%D9%88-%DA%A9%D8%A7%D9%84%D8%B4%DB%8C-%D8%AF%D8%B1-%D8%A8%D8%A7%D8%B2%D8%A7%D8%B1-%D9%86%D9%88%D8%B8%D9%87%D9%88%D8%B1-%D9%BE%DB%8C%D8%B4%D8%A8%DB%8C%D9%86%DB%8C-%D8%B1%D9%88%DB%8C%D8%AF%D8%A7%D8%AF%D9%87%D8%A7

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.”

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