Nomura International Wealth Management’s (Nomura IWM) CIO and head of managed investments is leaving the bank, Asian Private Banker has learnt. Gareth Nicholson, who served as Nomura IWM’s CIO and head of managed investments for nearly five years, will be joining First Abu Dhabi Bank, according to sources familiar with the matter. Effective February, Nicholson will relocate from Singapore to…