[The Nasdaq closed down 5.5% and the AI ​​industry chain suffered a heavy setback] The three major U.S. stock indexes collectively fell sharply, with the Dow Jones Industrial Average falling 3.44%, the Nasdaq Composite Index falling 5.52%, and the S&P 500 Index falling 4.35%. The AI ​​industry chain fell collectively. In the storage sector, SanDisk fell by more than 22%, Western Digital and Micron Technology fell by more than 17%, and Hynix fell by more than 13%. In terms of optical communication stocks, Lumentum fell by more than 18%, Marvell Technology fell by more than 16%, and Corning fell by more than 12%. In terms of cloud service companies, Oracle fell by more than 7%, CoreWeave fell by more than 9%, and NEBIUS fell by more than 14%.