Tarek Mansour says most advice is 'mostly trash' as his prediction market company hits a $22 billion valuationMost startup founders collect advice like frequent flyer miles. Tarek Mansour, the 30-year-old CEO of prediction market platform Kalshi, would rather light the whole loyalty program on fire. In a recent interview with The New York Times, Mansour dismissed the standard playbook for building a company, calling conventional business wisdom “usually mostly trash.” The company has grown to command roughly 95% of the US prediction market share, according to Mansour’s own claims. The company competes most directly with Polymarket, the crypto-native prediction market that gained massive attention during the 2024 US presidential election.