A view of the exterior of the Citibank corporate headquarters in New York, New York, U.S. May 20, 2015. Technology staff working on overlapping functions are also at risk of being laid off, one of the people said. "Simplifying the organization will also advance the execution of Citi's transformation, the firm's top priority," the company said in a statement on Wednesday. Citigroup has invested heavily in recent years in technology systems to increase risk controls and compliance to address the consent order, one of the sources said. But the company still employs many people with overlapping functions and redundant technology systems, one of the sources said.

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Persons: Mike Segar, Jane Fraser, Moody's, Peter Nerby, Fraser, Tatiana Bautzer, Saeed Azhar, Lananh Nguyen, Leslie Adler Organizations: Citibank, REUTERS, Citigroup, Technology, Citi, Bank of America, Wells, Thomson Locations: New York , New York, U.S, North America