ABN Amro, Citigroup, Deutsche Bank and Rothschild have landed the plum mandates to advise Royal Dutch Shell, the world's third-largest oil group, on its €147bn ($186m) merger of the British and Dutch companies.

According to the terms of the deal, which will end the century-old dual-trading structure, shareholders in both Royal Dutch and Shell Trading and Transport will be offered shares in a new company which will be incorporated in London, but based in the Netherlands.