The $117.5 billion London-based European arm of Goldman Sachs Asset Management has warned a UK vote to leave the European Union in June could "affect" how it does business, as it revealed its profits surged to a four-year high in 2015.

Goldman Sachs Asset Management International, which focuses on Europe, the Middle East and Africa, said in its latest annual accounts published at Companies House that profits more than trebled from $14.3 million in 2014 to $53.4 million in 2015. The profits were the highest recorded in a calendar year by the asset manager since 2011, when it generated $140.4 million in profits, past accounts show.