The Prime Minister has hailed the success of the capital's technology industry at the Urban Age Electric City Conference in Shoreditch.
He said: "Two years ago I set out my commitment to help Tech City become one of the world's great technology centres''
"Today we are seeing it continue to grow and go from strength to strength - and that is down to the talented, creative entrepreneurs who have set up there''
Mayor Boris Johnson said "The time is right to lay solid foundations in Tech City for London's digital revolution, and this list of major new firms committing to the area is a testament to the confidence leading tech entrepreneurs have in the capital''
"Our new centre will provide not only a vital resource to nurture upcoming technology and creative superstars from around the world, it will drive huge investment into the capital and help create thousands of jobs."
More top news
A drunk man who narrowly escaped death when he lay down between train tracks in Harlow has been given a 12-month community order.
A man from north London has been charged with the manslaughter of Louella Eve Fletcher-Michie, who died at the Bestival music festival.
The mother of Ellie Butler - the six-year-old murdered by her father - has lost a bid to challenge her conviction.