Today, the stock market saw a significant drop as the Nasdaq index declined due to increasing Treasury yields. Companies like Nvidia, Micron, and Sandisk experienced a fall in their stock prices during morning trading. The Nasdaq retreated as chipmakers faced a sell-off, with Micron, Sandisk, and a fintech company also witnessing a decrease in their stock values. The current market situation indicates a challenging day for these companies as investors closely monitor the impact of rising Treasury yields.