The Dow Jones Industrial Average opened down 2.3%, the S&P 500 fell 2.4%, and the Nasdaq fell 2.9%. Bank stocks weakened, with Goldman Sachs and Morgan Stanley falling 6% each, while JPMorgan Chase, Citigroup and Wells Fargo fell 5%. The semiconductor sector fell, with Marvell Technology, Intel and Broadcom falling 7% each, while Nvidia and Qualcomm fell 6%. DuPont fell 11.5%, and the State Administration for Market Regulation decided to initiate an investigation into it in accordance with the law.