Seaspan Corp has extended options to order six large boxships in China, the New York-listed company revealed as it reported annual results that were in line with analyst expectations.

Chief executive Gerry Wang said this week that the containership lessor now has until 30 June to strike on its options for six 10,000-teu or 14,000-teu vessels at Jiangsu New Yangzi Shipbuilding and Jiangsu Yangzi Xinfu Shipbuilding in China.