Citigroup Inc. announced plans to increase the number of its common shares outstanding and execute a reverse stock split. News that the bank had been profitable in the first two months of the year sparked the market rally that began last week. Citigroup shares fell 39 cents, or 13 percent, to $2.69, while JPMorgan Chase & Co. fell $1.83, or 6.8 percent, to $25.28.