The long-charging bull market has lifted the fortunes of U.S. stock indexes and created challenges for active managers, but Chicago-based Morningstar has identified four domestic stock managers whose funds excelled throughout 2017. In naming its 2017 Morningstar Domestic Stock Fund Manager of the Year nominees, Morningstar emphasized that careful choices enabled managers to far exceed the impressive returns offered by indexes like the S&P 500, which exceeded 21.8 percent for the year.