Dow soars 550 points in big relief rally as investors weigh key earnings reports

US stocks soared on Monday in a relief rally as investors await a slew of high-profile earnings reports. The Dow jumped 550 points, and the Nasdaq Composite rose more than 3%. Goldman Sachs warned stocks are still to expensive, even after a 25% drop in the S&P 500 this year. Something is loading. Thanks for…