DP World, which bought out P&O for £3.9 billion in 2006 and is listed on the London and Nasdaq Dubai stock exchanges, revealed a $555 million (£367 million) profit for 2012. This marks a 21% increase for the world’s third-biggest port operator, though the figure was boosted by $249 million of profit from asset sales, such as a stake in a company that runs terminals in Yemen. Owned by debt-laden Dubai World, DP has been restructuring its portfolio, which includes 60 terminals in six continents, as it looks for growth markets when the global economy remains treacherous.