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Gary Klesch
Industry, Investment
Rank 2017
237
Worth
£526m
Rise/fall
£9m

Born in Ohio and now a British citizen, Klesch, 70, should have been happy with last year's vote in favour of Brexit, having predicted the UK could experience "explosive growth" if it left the EU. His London-based Klesch Group, with annual revenues of about £2.54bn, operates oil and metals companies and invests in struggling businesses. He divides his time between Britain and Switzerland, whose 2016 rich list clips him back to £526m.