Norwegian shipping group Fred Olsen's holding companies Bonheur and Ganger Rolf are merging to increase efficiency.

Bonheur has 62.66% of its sister operation and will maintain its Oslo listing.

Ganger Rolf shareholders will receive 0.8174 Bonheur shares for every one they own, equalling 23.95% of the new company.

"The boards consider that the merger will assist in providing a more transparent and accessible corporate structure which may yield capital and operational efficiencies," the companies said.

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