U.S. stocks jumped Monday, the first day of the second quarter. The Dow Jones industrial average rose 329.74, or 1.3 percent, to 26,258.42. The broader Standard & Poor's 500 index rose 32.79, or 1.2 percent, to 2,867.19. The technology-heavy Nasdaq composite index rose 99.59, or 1.3 percent, to 7,828.91.