Polymarket’s Shayne Coplan (left) and Kalshi’s Tarek Mansour are two 20-something billionaires who run the biggest prediction market sites. They have had a long-running rivalry.
There’s one word Kalshi CEO Tarek Mansour is loath to say: Polymarket.
Like a politician swiping his never-to-be-spoken-of challenger on the campaign trail, Mansour will drag the enemy but never name the enemy.
Yes, there’s an “unregulated, offshore prediction market,” which is not like Kalshi. Too many people, Mansour says, confuse Kalshi for that “non-American, unregulated platform.”
For Mansour, distinguishing Kalshi from that other site is a form of combat. If there’s a chance to land a blow, he
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