U.S. stocks opened with the Dow up 0.6 percent, the S & P 500 up 0.1 percent, and the Nasdaq down 0.01 percent. UnitedHealth (UNH. N) rose 10 percent, as the company acquired a new position from Buffett's Berkshire Hathaway. Intel (INTC. O) rose 4 percent, reporting that the Trump administration was seeking a stake.