Provided by Dow Jones By Joe Wallace and Michael Wursthorn U.S. stocks mounted a late-session turnaround Thursday, closing at session highs, following upbeat corporate earnings and signs of continued improvement in the labor market. Stocks rallied in the last hour of trading as investors snapped up shares of everything from consumer staples to banks to technology companies. The S&P 500 ended just shy of a record after bouncing around the flatline earlier in the day, while the Dow Jones Industrial Average jumped more than 300 points, notching a fresh watermark. The Nasdaq Composite also got a boost, closing in the green and snapping a four-day losing streak.