The investment group has boosted its stake from 3.89% to a fraction more than 5% in recent trades, giving it a slice worth $167.85m.

It owns 16.615m shares in total.

Funds involved include Orbis Global Equity, Orbis International Equity and Orbis Institutional Global.

Kristian Siem’s Siem Industries remains the major shareholder with 20.99%, according to the shipping company’s website, with Folketrygdfondet second on 6.24%