Today's performance of the US stock market was lackluster, with a weak opening and a final close that marked a significant drop in prices. The Nasdaq Composite Index (Nasdaq) fell by 2.3%, the S&P 500 by 1.37%, and the Dow Jones Industrial Average (Dow) by 1.21%. Notably, the Philadelphia Semiconductor Index led the decline, dropping more than 7%, indicating significant pressure on the technology sector.