U.S. stock market update: Datavault AI down 15%, trading volume increased, market volatility significantly

U.S. Stock Market Midday Update Datavault AI, down 15.00%, with increased trading volume and no significant news recently. The trading is active, with clear capital flows. Considering the sector and industry trends, the stock shows significant volatility, and the specific reasons need further observation. Stocks with High Trading Volume in the Industry Nvidia up 2.27%. Based on recent key news: On December 18, Nvidia board member Harvey Jones sold over $44 million worth of company stock. This raised market concerns about internal confidence, leading to stock price fluctuations. Source: Zhitong Finance On December 17, Nvidia announced a partnership with OpenAI to build a large-scale data center. Although the investment plan is as high as $100 billion, no payments have been made yet. This news boosted market expectations for future growth. Source: Zhitong Finance On December 16, Nvidia acquired AI software company SchedMD, strengthening its AI ecosystem layout and driving up stock prices. Source: Zhitong Finance. The demand for AI chips has surged, increasing market volatility. Micron Technology up 11.87%. Based on recent key news: On December 18, Micron Technology reported first-quarter earnings, with adjusted earnings per share of $4.78, exceeding market expectations of $3.95, and revenue reaching $13.64 billion, a 57% year-over-year increase. The stock price surged over 10% in pre-market trading. Source: Jinwu Finance On December 18, Micron Technology issued an optimistic revenue outlook, expecting second-quarter revenue between $18.3 billion and $19.1 billion, far exceeding the market expectation of $14.3 billion. The demand for AI computing hardware exceeds supply, pushing the stock price up about 5% in after-hours trading. Source: Bloomberg On December 18, Micron Technology announced an increase in its fiscal year 2026 capital expenditure forecast to $20 billion, up from the previous estimate of $18 billion, showing the company's confidence in future growth. Source: Bloomberg. AI demand drives growth in the chip industry, but risks remain. Broadcom up 0.60%, with increased trading volume. Based on recent key news: On December 16, Broadcom's stock price plummeted 17.7%, with a market value evaporating by over $300 billion, due to its AI business revenue expectations failing to meet market expectations, raising investor concerns about the growth rate of the AI industry chain. Source: Wall Street Insight On December 17, JP Morgan analysts expressed an optimistic view on Broadcom, believing its position in the semiconductor market is solid, and capital expenditures in data centers will significantly increase, driving industry development. Source: JP Morgan On December 18, concerns about an AI bubble intensified, with Broadcom's stock price dropping over 21% in five days, but some experts remain optimistic about the fundamentals of AI demand. Source: UBS, JP Morgan. The semiconductor industry faces risks from the AI bubble and requires attention Stocks Ranked Among the Top by Market Capitalization in the Industry TSMC rose by 3.21%. Based on recent news: On December 18, TSMC plans to install 3-nanometer chip production equipment in Arizona, USA, with the goal of mass production by 2027. This move is seen as an important milestone for TSMC in bringing advanced processes overseas, enhancing its global competitiveness. On December 17, Morgan Stanley raised TSMC's target stock price to NT$1,888, expecting revenue growth in the mid-20% range for 2026, ultimately achieving a year-on-year growth of 30%. Analysts believe its revenue and profit margins have growth potential. On December 17, Nomura Asset Management released its 2026 Taiwan stock investment outlook, emphasizing that the development of the AI industry remains very exciting. TSMC has revised its five-year compound annual growth rate for AI from 30% to 40%, estimating that AI-related revenue will double by 2029 compared to 2024. AI demand continues to grow, and the semiconductor industry is recovering