John Hyman: Mystery and speculation surround Hyman, who disappeared from public view in May. The former global co-head of capital markets at Morgan Stanley was due to join rival Nomura as co-head of global finance after the summer but his passage was blocked by the FSA, according to reports. Morgan Stanley, Nomura and the FSA remain tight-lipped as to the reasons why.

Jerker Johansson: Swedish-born Johansson left UBS's investment bank in April 2009 after being replaced as chairman and chief executive after just one year in the job by incoming CEO Oswald Grübel.