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Mo Ibrahim
Mobile phones
Rank 2017
143
Worth
£904m
Rise/fall
£177m

Sudanese-born Ibrahim, 71 last Wednesday, netted £200m in 2000 from the $916m sale of Mobile Systems International after leading a group of BT managers who invested £100,000 in the consulting operation. A separate African mobile venture was earlier demerged. London-based Ibrahim stayed with what became Celtel, which was divested for $3.4bn, making his family £480m from the sale.