Société Générale's corporate and investment banking division in London is understood to have lost its ninth corporate derivatives banker in six months with the departure of a specialist covering Greek clients last week.

Dimitrios Planiotis, who covered the Greek corporate sector for the investment bank, resigned last Thursday in the latest of string of bankers to have left its European corporate derivatives coverage team since March, according to Financial Services Authority records. It is not known whether Planiotis is joining another bank.