Tarek Mansour Founder of Kalshi Backed byAndreessen HorowitzIVPSequoia CapitalSpark CapitalAlexa LyonsAmelia Green-VamosBen HorowitzDonald Valentine LinkedIn SourcesKalshi Raises $300 Million at $5 Billion Valuation, Expands to 140 Countries — 2025-10 Browse all founders · Browse investors