 Shares of UnitedHealth Group Inc. UNH, 0.46 climbed 1.3 in premarket trading Friday, after the health insurer reported fourth-quarter profit and revenue that rose expectations and affirmed its 2023 outlook. Net income rose to .76 billion, or 5.03 a share, from 4.07 billion, or 4.26 a share, in the year-ago period. 