 The scandal involved surveillance of Iqbal Khan, Credit Suisse's former head of Wealth Management who had moved to rival bank UBS.Thiam is believed to have direct knowledge or involvement in the surveillance.Over the course of his tenure, the market value of Credit Suisse dropped by almost half (on February 8, 2020, UBS was at 70% of its March 2015 stock price, Credit Suisse 55%).