Ocean Mainport Holdings Ltd is the owner of 16 support vessels operating in both the UK and Norwegian sectors of the North Sea.
The operations of the company and its subsidiaries will remain unaffected and are anticipated to expand under the new ownership arrangements.
Irish Mainport will continue to operate tugs, stand by and offshore vessel in Ireland and on a world-wide basis.
The Norwegian shipowning and vessel management company Sartor Shipping has full or part-ownership in 23 offshore support vessels and new ships in order.
In addition the company have management for three other offshore support vessels. The company employs 700 mariners and 40 people on shore at the main office at Sotra outside Bergen and branch offices in Haugesund, Stavanger and Aberdeen.