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Michael Platt
Hedge fund
Rank 2017
48=
Worth
£2,400m
Rise/fall
£300m

London-based hedge fund BlueCrest Capital Management now only handles the wealth of partners and members after Geneva resident Platt called time last year on managing money from outside clients. The move worked: the fund reported a 50% gain during 2016. The company, which was valued at £1.51bn in 2011, was founded by Preston-born Platt, 49, and business partner William Reeves, who retired from the operation and moved to Hawaii.