U.S. stock indexes experienced a downturn on Monday, with the Dow Jones Industrial Average dropping 238.90 points, or 0.54%, to close at 44,403.62. The S&P 500 fell 38.12 points, or 0.63%, to 6,052.15, and the Nasdaq Composite retreated by 131.66 points, or 0.66%, closing at 19,728.11. The declines were primarily driven by a significant drop in Nvidia Corp.'s stock, which faced headwinds from a Chinese probe into alleged anti-monopoly violations. Investors were also bracing for the release of key inflation data later in the week, which could influence the Federal Reserve's next moves on interest rates.