1. Alex Pusco, Activtrades (17=)
A former personal broker for high-net-worth individuals, Swiss-born entrepreneur Alex Pusco used the internet to expand his client base, establishing one of the first European online trading platforms in 2001. He moved the sales hub of ActivTrades to the City in 2005 before diversifying into his current mainstays of forex and spread betting. ActivTrades also offers services to institutions needing support for their portfolio managers and to independent brokers, as well as technology allowing punters to trade via their smartphones. Pusco is reportedly looking at setting up a South American operation. In 2013 ActivTrades made a £9.3m profit on £22m sales.
2. Lance Uggla, Markit (21)
Lance Uggla provides banks with vital trading data
Canadian bond trader Lance Uggla first came to London to study at the LSE in 1986, but it wasn't until 2001 that he started up financial data provider Markit Group in a barn near his then home in leafy St Albans, Hertfordshire. About to turn 40, he was in the mood to go it alone and reckoned he had spotted a gap in the market for a service that provided banks with vital data about the volume and prices of their trades with each other. It worked and he now employs some 800 staff in his London HQ alone, and has 22 offices around the world. Markit floated on Wall Street in June valued at around $4.3bn, but Uggla remains committed to the UK capital. His fashion-student daughter, Riley, has featured on reality TV show Made in Chelsea.