UnitedHealth Group Inc (NYSE:UNH) stock is dragging the Dow and its sector today, after the health insurer suspended its 2025 guidance amid steeper-than-anticipated expenditure issues. CEO Andrew Witty is also stepping down, citing personal reasons. At last check, UNH was down 12.8% to trade at $330.25, and earlier fell to an five-year low of$322.90. Sector peers Cigna (CI), CVS Health (CVS), and Humana (HUM) are all deep in the red in response to today's news. This is poised to be the stock's sixth-straig ...