Wall Street was mixed with low volumes of trading Friday with major U.S. markets struggling to end in positive territory for the week. Futures for the S&P 500 were virtually unchanged before the bell,

Wall Street is retreating from its record as a slide for Walmart weighs on U.S. stock indexes Thursday. The S&P 500 was down 0.6% in morning trading after setting all-time highs in each of the last two days.

Microsoft was the strongest force pushing the S&P 500 upward. It rose 1.3% after saying it had developed what it calls the world’s first “quantum processing unit,” which cou