Microsoft back as world's most valuable company

Microsoft has regained the title of the world's most valuable public company just days after it was overtaken by one of its rivals.Computer chip maker Nvidia lost its hold on the top spot after its shares slipped by 3.5% in the US on Thursday, leaving the company valued at $3.2trn (£2.5trn). Microsoft's shares also dipped slightly, but it still ended the day's trading worth $3.3trn (£2.6trn).Nvidia, Microsoft and Apple are now in a three-horse race for the top spot, while they are also battling to become th ...