ATHENS - The Athens stock exchange on Wednesday lifted a trade suspension on shares of Piraeus Port Authority it had imposed a day earlier after the country’s privatisation agency unsealed a bid by China’s Cosco for a majority stake in the port. Greece received a sole bid from China’s Cosco Group for Piraeus Port Authority, the operator of the country’s biggest port, and will ask it to raise its offer. Piraeus Port shares were down 4.47 percent at 13.9 euros, underperforming the broader market.