U.S. stocks were mostly higher Wednesday, The Dow Jones industrial average rose 495.64, or 2.4 percent, to 21,200.55. The broader Standard & Poor's 500 index rose 28.23, or 1.15 percent, to 2,475.56. The technology-heavy Nasdaq composite index fell 33.56, or 0.45 percent, to 7,384.30.