Wall St. ends little changed though Nasdaq hits record high close

Among the S&P 500’s biggest drags was Dow Chemical , which fell 2.4 percent to $52.33, while DuPont declined 1.9 percent to $67.66, a day after European Union regulators opened a full investigation of their $130 billion merger agreement. The S&P materials index , down 1.2 percent, led sector declines in the benchmark index. All three major U.S. stock indexes ended at record highs on Thursday for the first time since 1999, extending a recent rally that has increased investor concern