US midday market brief: Dow rallies over 400 points as Oracle's AI boost propels S&P 500, Nasdaq higher

Core Viewpoint - Wall Street has achieved a four-day winning streak, with significant gains in major indices, indicating positive market sentiment and investor confidence [1] Group 1: Market Performance - The Dow Jones Industrial Average increased by over 400 points by midday, reflecting strong performance in the market [1] - Both the S&P 500 and Nasdaq Composite also showed notable gains, contributing to the overall positive trend in the stock market [1]