In This Story UNH -8.62% BABA +5.93% CELH +30.02% SQ DBX -14.74% The Dow dropped 400 points as the Justice Department’s investigation into UnitedHealth weighed on the market . Additionally, a weaker-than-expected U.S. housing sales report added to the pressure, with high prices and mortgage rates contributing to the slowdown. According to the National Association of Realtors, sales of previously owned homes fell 4.9% in January compared to the previous month, much worse than the anticipated 2.6%