Citigroup has become the latest investment bank to extend notice periods for its senior bankers, with a new 75-day lock-in for managing directors who quit to join a rival. It will also be able to claw back bonuses from those who quit within 75 days of receiving them.

According to an internal document sent to senior staff last week, directors' notice periods have been extended to 50 days. They will forfeit their bonuses if they quit within 50 days of receiving payment.