7. Pierre-Olivier Bouée – Fell on Sword

Credit Suisse delivered the rumblings this year, with a total of four major management changes under CEO Tidjane Thiam: the largest was the defection of Iqbal Khan, head of the Swiss bank's biggest private banking unit since 2015.

The news that the 43-year-old would co-run UBS' flagship wealth arm – just three months after leaving Credit Suisse – unleashed a major scandal. Credit Suisse had Khan tailed, leading to an embarrassing melee with a private detective in a tony Zurich street near the Swiss bank's Paradeplatz headquarters.

The scheme blew up in Credit Suisse's face when Khan alerted police. White-collar law firm Homburger found that Thiam hadn't known about the plan, which it said was organized by operating chief Pierre-Olivier Bouée (pictured above). The Frenchman, a long-standing and close associate of the CEO, resigned in October and was sacked last week after another, seemingly unrelated incident of spying on a top executive surfaced. 

The move means the 48-year-old is leaving more than $4 million of vested Credit Suisse instruments on the table. Depending on an investigation by Switzerland's regulator, Bouée will find it difficult to clinch another finance industry job.