The U.S. stock market once again experienced severe shocks. Among them, the share price of Ultramicro Computer (AMD) plunged more than 30%, and finally closed down 32.68%, setting a major focus event in the market in the near future. This plunge triggered widespread market attention and investor panic. As a giant in the semiconductor industry, the collapse of Ultramicro Computer's share price not only reflects the company's own management problems, but also reveals the strict requirements and high volatility of the current market environment for companies. The incident not only raised investors doubts about the financial health of ultramicro computers, but also raised systemic concerns about the entire technology sector. At the critical moment of the U.S. stock earnings season, many technology and health care stocks frequently burst into "thunder", which severely damaged investor confidence. In addition to ultramicro computers, chip maker AMD's shares also fell more than 10%, as its fourth-quarter revenue guidance failed to satisfy investors.