 Shares of Wells Fargo Co. WFC, 0.21 slumped 2.6 in premarket trading Friday, after the bank reported fourth-quarter profit that was more than halved but topped expectations, while revenue fell short. Net income fell to 2.59 billion, or 67 cents a share, from 5.47 billion, or 1.38 a share, in the year-ago period. 