Bumi Armada, Geooffshore, Opstad Group, Sofield Marine & Offshore and Vega Offshore are behind the contracts which are worth $186m.
Singapore-listed Nam Cheong says it has also secured options for the sale of eight additional anchor handlers to the same design.
Bumi Armada intends to order four vessels with the option for four additional vessels. Singapore-based Geooffshore also intends to order four plus four newbuildings.
Norway-based
