A group of “rebel shareholders” in Norwegian aquaculture group NTS looking to oust majority shareholder Helge Gaso and his son Anders from the board have reportedly regained the upper hand.

The shareholders, including Terboli Invest, Nils Williksen and Rodo Invest, failed in their initial attempts to overthrow Gaso last month, but an additional share purchase in NTS by investment fund Haspro, one of the group's members, has shifted the balance, giving the group over a 50 percent shareholding.

A new general meeting later this month could give the group another chance at ousting Gaso.