U.S. stocks ended mixed Monday. The Dow Jones industrial average rose 28.90, or 0.1 percent, to 27,221.35. The broader Standard & Poor's 500 index fell 4.89, or 0.2 percent, to 3,020.97. The technology-heavy Nasdaq composite index fell 36.88, or 0.4 percent, to 8,293.33.