The share-price performance of British firms who rely on the majority of their sales from European markets has deteriorated since the country voted to leave the EU in 2016, according to newly compiled data.

A survey of the biggest 100 firms on the London Stock Exchange that generate more than 50% of sales inside the EU, showed their collective median price performance was down 3.3%, research produced by FactSet for FN’s sister-publication MarketWatch showed.