Norway's Wilh Wilhelmsen Holding has increased its exposure to the offshore sector with a deal to take control of NorSea Group.

The Oslo-listed company said it had spent NOK 545m ($70m) on building its stake in the offshore supply base company to 72% from 40%.

Eidesvik Eiendomsinvest and Simon Mokster Eiendom retain 12% each, while NorSea management has the remaining 4%.