Hyundai Mipo Dockyard Co Ltd said on Tuesday it had decided to sell a stake worth 286 billion Korean won ($260.46 million) in steelmaker POSCO , in a bid to improve its balance sheet. Hyundai Mipo, a shipbuilding affiliate of world’s largest shipbuilder, Hyundai Heavy Industries, specializing in smaller vessels, said in a regulatory filing the sale would take place before the market opens on November 19.