25. Mark Scheinberg
Net Worth: $3.37 billion
Change from 2017 Ranking: ▲2.1%
Major company holdings: PokerStars
Mark Scheinberg is the son of Isai Scheinberg, the mind behind online gambling pioneer PokerStars, founded in 2001 when the Internet gaming industry was still nascent. After more than a decade growing the company, the Scheinbergs cashed out three years ago, selling to Amaya Gaming for $4.9 billion. By the time of the sale, Mark was the majority owner in PokerStars’s parent company.