Citigroup Inc lost more than one-quarter of its market value on growing worries over whether it has enough capital to withstand billions of dollars of potential losses and despite new support from its largest individual investor.
Saudi Prince Alwaleed bin Talal said he plans to increase his stake in Citigroup, the No. 2 U.S. bank by assets, to 5 percent from less than 4 percent, calling its shares "dramatically undervalued."
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