Antonio Horta-Osorio was reportedly found to have broken the UK’s COVID quarantine rules.
Horta-Osorio was the former boss of Lloyds Banking Group joined Credit Suisse after a series of scandals at the Swiss bank.
Mr Horta-Osorio, who was the chairman of Credit Suisse for less than a year, has been replaced by board member Axel Lehmann.
“I regret that a number of my personal actions have led to difficulties for the bank and compromised my ability to represent the bank internally and externally,” Horta-Osorio said in a statement issued by the bank.
“I therefore believe that my resignation is in the interest of the bank and its stakeholders at this crucial time,” he added.
Last month, Ticker News partner news network, Reuters reported that a preliminary investigation by Credit Suisse had found that Mr Horta-Osorio had breached COVID rules.
He reportedly attended the Wimbledon tennis finals in July at a time when the UK’s Covid-19 rules required him to be in quarantine.
