Billionaire Fredriksen’s Breakup With Adviser Troeim Hits Shares

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Rig company Seadrill Ltd. and salmon farmer Marine Harvest ASA slumped in Oslo trading amid a fallout between their main owner, billionaire John Fredriksen, and his long-time adviser Tor Olav Troeim.

Seadrill fell as much as 3.9 percent in Oslo, adding to a 4 percent drop on Friday after Troeim’s surprise departure from the board of the world’s largest offshore driller by market value. Archer Ltd., an oilfield-services company owned 39.9 percent by Seadrill, dropped as much as 5.4 percent, while Marine Harvest, the biggest salmon producer, declined as much as