The complex deal agreed with the Treasury Department will increase the Government’s stake in Citi to as much as 36%. The deal sees up to $27.5bn (£19bn) in preference shares converted into common stock, which the Government, which owns $45bn (£31.25bn) in Citi preference shares, will match up to $25bn (£17.3bn) of conversions.

Davis Polk is advising Citi and negotiating with the private investors, a group that includes Capital Research Global Investors and Capital World Investors, the Government of Singapore Investment Corp (Singapore’s sovereign wealth fund) and the Saudi prince Alwaleed bin Talal. The Kuwait Investment Authority also plans to participate in the exchange, according to several lawyers involved in the talks.