UK-headquartered investment banks have taken their lowest share of fee revenue from deals for British clients since 2009, as US, German and Swiss rivals encroach on market share, according to Dealogic.

UK banks have taken a 27% share of UK investment banking revenue between January 1 and May 22, 2013. This is down from a 34.7% share for the same period last year and the lowest year-to-date share since 21.4% in 2009, according to the data provider.