Seaspan Corp has continued its aggressive fleet expansion with an order for two more neo-panamax containerships.

The shipowner's parent company, New York-listed Atlas Corp, announced that an unnamed major shipyard will build the 12,000-teu units for delivery in the fourth quarter of 2022.

The ships, as is customary with Hong Kong-based Seaspan, will then begin long-term charters to a global container line.