Holding company Petroshares sold 6.5 million shares in Greek refiner Motor Oil at 22.44 euros a share, according to a source familiar with the company. The placement raised around 146 million euros, the source said. The Vardinoyiannis family, a major shareholder in Motor Oil, owns stakes via two subsidiaries, Petroventure Holdings Ltd and Petroshares Ltd. Motor Oil announced earlier that the family planned to sell a stake in the country's second-largest refiner. The placement was made by investment bank Citigroup and Merrill Lynch.