Barclays is threatened with multi-million pound fines and its boss Jes Staley will suffer a significant pay cut after he broke rules to protect whistleblowers in an effort to defend a friend against "malicious smears".
The Financial Conduct Authority (FCA) and the Bank of England's Prudential Regulation Authority (PRA) have launched investigations into both Barclays and Mr Staley after it emerged he twice tried to identify the author of two anonymous letters sent last June that raised concerns about a senior banker that Mr Staley recently recruited.
The regulators' rules shield the identities of whistleblowers who request anonymity to encourage people to come forward with sensitive information.
The 60-year-old chief persisted with his unsuccessful efforts to unmask the whistleblower last year despite having been told by the bank after his first attempt that it was inappropriate to do so. He instructed the bank's security team to track down the whistleblower, which in turn enlisted the help of an unidentified US law enforcement agency.
As punishment for the extraordinary rule breaches, the lender's board said Mr Staley, an American who took home £4.2 million ($7.5m) last year, will suffer a "very significant" cut to his pay and will receive a formal written reprimand. The drop in his pay will be determined after the regulators finish their probe.