Forbes has unveiled its 2025 "30 Under 30" list, highlighting self-made billionaires, with a notable presence from the prediction markets sector. Among the young billionaires are Polymarket founder Shayne Coplan, who ranks ninth with a net worth of $1 billion, and two co-founders of Kalshi, both aged 29. The list also features a 29-year-old co-founder of Stake. This year's list is dominated by the artificial intelligence industry, which claims nine of the top 13 spots.