The technology sector’s grip on the top spots in the annual Management Top 250 ranking slipped this year. Microsoft red down pointing triangle held its ground, ranking No. 1 in this measure of the best-run companies in the U.S. for the third straight year. But unlike last year, when tech companies took the first five spots in the ranking, this year’s top five include General Motors Co. GM reen up pointing triangle at No. 4 and Whirlpool Corp. WHR red down pointing triangle at No. 5.