Credit Suisse also has a new big investor, following the appearance of a major U.S. fund house in UBS' shareholder register.

British fund manager Silchester has taken a 3.03 percent stake in Zurich-based Credit Suisse, according to an obligatory stock market disclosure. Silchester is the sixth-largest Credit Suisse investor after Blackrock, Norway's Norges, Chicago's Harris Associates, Qatar's sovereign wealth fund, and the Saudi Arabian Olayan Group. 

On Thursday, U.S. turnaround fund specialist Dodge Cox emerged as a 3.03 percent, or $1.5 billion at present market value. London-based Silchester is well-known in Switzerland as the largest shareholder in troubled asset manager GAM, and has previously held a notable stake in Julius Baer.