Since Monday, September 14, stocks of Citigroup Inc. have been depreciating significantly. The stocks have already lost 13.69%.
It is likely that the stock price tumbled as the Office of the Comptroller of the Currency and the Federal Reserve announced that they were preparing to reprimand the bank for failing to upgrade its risk-management systems.
Note that the Chief Financial Officer Mark Mason claimed that the bank had planned $1B investment this year to support Citigroup's infrastructure and improve risk management and compliance.