Vis Raghavan, head of banking and executive vice chair at Citi, during the Bloomberg Sell Side Leaders Forum in New York on Apr. 22, 2025.Bess Adler/Bloomberg When Vis Raghavan heard that Citigroup Inc. Chief Jane Fraser was struggling to find someone to oversee investment banking last year, he called her with an audacious pitch: The London-based banker, whose star was dimming at Jamie Dimon's JPMorgan Chase & Co., said he could work wonders for Citigroup's franchise.Fraser's decision to hire him after ju ...