Citigroup has not come roaring out of the financial crisis like Goldman Sachs or JPMorgan Chase. Some analysts think the problems at Citigroup are inherent to the "one-stop-shopping" business model that Citigroup pioneered in the 1990s.

Yesterday, Vikram Pandit, the head of Citigroup, suddenly resigned saying it was time for new leadership. Pandit has been replaced by Michael Corbat, who was previously leading the bank's Europe, Middle East and Africa division.

A sudden change of leadership at Citigroup raises new questions about the future of the embattled banking giant.

Vikram Pandit is stepping down as CEO of Citigroup. He'll be replaced by Michael Corbat, who runs some of the banks overseas divisions.

Citigroup pays up for past deeds. Earlier this week, we learned the SEC is investigating Ally Financial for its own mortgage practices around that time.

Four years after the financial crisis, it's like the chickens of 2007 and 2008 are finally coming home to roost.

Last week we spent plenty of breath on Sandy Weill, the former head of Citigroup. Back in the '90s, he fought for his and other banks to grow huge and complex. Then last week Weill goes on TV and says: "It's time to break up the big banks."

Sandy Weill, who engineered Citigroup and the creation of megabanks, says big banks should be split up. Will the debate now gain traction?

A peek inside annual meetings for the big banks, where small shareholders get to talk directly to executives.

Citigroup and other companies face shareholder disapproval of high executive pay. Will the boards of directors heed the concerns?