U.S. stocks opened lower, with the Dow Jones Industrial Average down 0.72%, the S&P 500 down 1.28%, and the Nasdaq Composite down 1.58%. Nvidia (NVDA.O) fell 2.4% after suppliers suspended production of key components for its H200 chip. Novo Nordisk (NVO.N) fell 3.4%. Amazon (AMZN.O) fell 2.3% after the company projected further layoffs.