FILE - In this April 16, 2009 file photo, a sign at the Citigroup Center is shown in New York. (AP Photo/M ark Lennihan, file)

A sign at the Citigroup Center is shown Thursday, April 16, 2009 in New York. Citigroup Inc. posted better-than-expected results for first quarter.reports earnings Friday, April 17. (AP Photo/Mark Lennihan)

NEW YORK - MARCH 20: An American flag flies outside of Citigroup Center (grey building-R) in Midtown Manhattan March 20, 2009 in New York City. Banking giant Citigroup announced a management shakeup today, moving its chief financial officer Gary Crittenden to ...

NEW YORK - NOVEMBER 17: (FILE PHOTO) People walk up from the plaza at the Citigroup Center November 17, 2008 in New York City. Citigroup CEO Vikram Pandit released a memo March 10, 2009 saying that the banking giant was profitable ...