Activist investor ValueAct has reportedly amassed a $1.2 billion stake in Citigroup (C)

ValueAct Capital has taken a $1.2 billion stake in Citigroup, according to The Wall Street Journal. 
The activist investor supports CEO Michael Corbat and reportedly isn't pushing for significant changes.
Activist investor ValueAct Capital has amassed a $1.2 billion stake in Citigroup, according to The Wall Street Journal. 
ValueAct took an $80 million stake in the bank in December and has since built it up to $1.2 billion, which is roughly 7% of Citi's $175 billion market capitalizati