Shares of all 30 Dow Jones Industrial Average components were trading higher, as the three companies reporting earnings gave investors reason to cheer. The gainers were leb by the 2.3% jump in UnitedHealth Group Inc.'s stock after the insurer beat profit and revenue expectation. Johnson & Johnson's stock tacked on 0.8% and Goldman Sachs Group Inc. shares gained 0.9% after both companies beat profit and sales expectations. Merck & Co. shares were the second-biggest gainer, up 2.0%. Among other more active Dow stocks, Apple Inc.'s gained 0.6% and General Electric Co.'s tacked o 0.5%. Meanwhile, Dow futures rallied 217 points.