A sell-off for Oracle is weighing on Wall Street as investors question whether its big spending on artificial-intelligence technology will pay off. The S&P 500 fell 0.4% Thursday and pulled further from its all-time high set in October. Drops for AI-related stocks dragged the Nasdaq composite down 1.2%. Oracle at one point was heading toward its worst loss since 2001 on worries about how much it plans to spend on AI infrastructure. But most stocks on Wall Street rose, and the Dow Jones Industrial Average jumped 465 points. Treasury yields slipped after a report showed more U.S. workers applied for unemployment benefits.