
S&P 500 Edges Up, Dow Plunges as UnitedHealth Crashes 23%
U.S. equity markets were mixed by Thursday afternoon as losses in heavyweight tech and healthcare stocks kept pressure on major indexes during the shortened holiday week. The Dow Jones Industrial Average dropped 462 points, or about 1.2%, weighed down by a sharp 23% slide in UnitedHealth (NYSE:UNH) after the insurer posted weaker-than-expected earnings. The Nasdaq…