U.S. stocks rose in volatile trading Wednesday. The Dow Jones industrial average rose 177.10, or 0.7 percent, to 26,067.28. The broader Standard & Poor's 500 index rose 24.62, or 0.8 percent, to 3,169.94. The technology-heavy Nasdaq composite index rose 148.61, or 1.4 percent, to 10,492.50.