Torbjörn Törnqvist co-founded trading house Gunvor with a Russian oligarch and close ally of Putin - Walaa Alshaer/Bloomberg A Swiss billionaire has sold his multibillion-pound stake in the trading house he co-founded after the US accused him of being a Russian “puppet”. Torbjörn Törnqvist has agreed to sell his entire 86pc shareholding in Geneva-based Gunvor, estimated to be worth $6.6bn (£5bn) overall, to a group of employees led by the company’s management. His decision, which also means he will leav ...