U.S. Stocks Close Mixed; Nasdaq Falls 0.51%, Philadelphia Semiconductor Index Drops 2.47%

U.S. stocks closed mixed today (May 18), with the Nasdaq falling 0.51%, the S&P 500 declining 0.07%, and the Dow Jones Index rising 0.32%. The Philadelphia Semiconductor Index (SOX) dropped 2.47%, led by Seagate Technology down nearly 7%, Micron Technology, Applied Materials, and SanDisk each down over 5%, and Western Digital down over 4%. Among major tech stocks, Netflix rose over 3% while Amazon, Microsoft, and Google posted modest gains; Tesla fell nearly 3% and Nvidia declined over 1%.