The rout in bank stocks this year has wiped a third off the value of bonuses paid out to bankers in the form of deferred share awards.

Four big investment banks - Credit Suisse, Deutsche Bank, Goldman Sachs and JP Morgan - have disclosed stock awards made this year for performance in 2010. These shares have already fallen in value by an aggregate $3.1bn this year, a paper loss of some 38% since when they were granted.