Anglo-African financial group Old Mutual has taken the unusual step of adding a third investment bank to its roster of corporate brokers, as it prepares to embark on a £370m expansion plan in Africa.

Goldman Sachs joins existing long-term brokers Bank of America Merrill Lynch and Deutsche Bank, according to a statement today. Old Mutual is Goldman Sachs's 12th FTSE 100 broking client. A FTSE 100 company will typically employ two corporate brokers.