Seaspan Corporation has exercised options to construct four 10,000 teu containerships at China's Jiangsu New Yangzi Shipbuilding and Jiangsu Yangzi Xinfu Shipbuilding.

The newbuildings are scheduled for delivery in 2016. Financial details of the deal were not disclosed.

New York-listed Seaspan expects to sign long term time charters for these vessels with one of the major container liner companies in the near future.

The shipowner added that the newbuildings will be constructed using Seaspan's fuel efficient SAVER design.

“We are contemplating adding another four to six 10,000 teu ships to meet the requirements of our charterers,” Wang said in a conference call in March.