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Mark Scheinberg
Gambling
Rank 2017
32
Worth
£3,698m
Rise/fall
£828m

Scheinberg, 43, who lives on the Isle of Man, has moved into property recently, buying a 50% stake in a Madrid hotel and residential scheme for about £200m. He got into the online gambling business when he was 28 after his father Isai founded PokerStars in Montreal before moving the operation to Costa Rica where his son joined him. PokerStars, which eventually relocated to the Isle of Man, quickly became the world's largest online poker company and was sold in 2014 for £3.3bn.