Seaspan Corp has quickly established itself as the leading tonnage provider of ships in the 7,000-teu containership segment.

The Hong Kong and Vancouver-managed company announced an order for 10 such ships late last month.

This lifted its portfolio of 7,000-teu ships on order to 25 vessels — close to half of the global orderbook.

The strategic expansion is testimony to chief executive Bing Chen's belief that these designs could emerge as the future workhorse of the midsize container segment.

About 51 ships of 7,000 teu are on order globally, including the 10 ordered by Seaspan, according to Clarksons' Shipping Intelligence Network.