U.S. stocks rose substantially Thursday. The Dow Jones industrial average rose 322.55, or 1 percent, to 33,291.78. The broader Standard & Poor's 500 index rose 58.35, or 1.4 percent, to 4,199.12. The technology-heavy Nasdaq composite index rose 207.74, or 1.7 percent, to 12,639.27. Oil fell significantly. West Texas Intermediate (WTI) crude futures dropped $2.37, or 2.5 percent, to $92.52 a barrel.