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Core Viewpoint - The U.S. stock market experienced declines, with major indices like the Dow Jones, Nasdaq, and S&P 500 all closing lower, amid ongoing pressure on AI-related stocks such as Oracle and Nvidia. The upcoming PCE inflation data is anticipated to influence market sentiment [1][2]. Market Performance - The Dow Jones fell by 171.50 points, a decrease of 0.37%, closing at 46,121.28 points. The Nasdaq dropped by 75.61 points, down 0.33%, ending at 22,497.86 points. The S&P 500 declined by 18.95 points, a 0.28% drop, closing at 6,637.97 points [2]. AI Sector Pressure - AI stocks continued to face pressure, with Nvidia down 0.8% and Oracle down 1.7%. Micron Technology's earnings report initially boosted market confidence, showing a 46% revenue growth driven by AI demand, but concerns about the cyclical nature of the AI industry dampened sentiment [4][5][6]. Investor Sentiment - Investors are questioning whether the growth plans of major AI companies like Nvidia and Oracle have sufficient energy support. There are concerns that the stock prices of these companies may have already priced in optimistic projections, leading to potential loss of momentum [6][7]. Valuation Concerns - High market valuations have led traders to consider profit-taking. Federal Reserve Chairman Jerome Powell highlighted concerns regarding elevated stock valuations, which have been driven by bullish sentiment around AI's potential, overshadowing geopolitical risks and trade tensions [8]. Upcoming Economic Data - Traders are adopting a cautious stance ahead of the unemployment claims data and the PCE inflation data set to be released [9]. Government Shutdown Concerns - Developments regarding a potential U.S. government shutdown have become a focal point, particularly after President Trump canceled a meeting that could have prevented a government shutdown before the September 30 deadline [10]. Alibaba and Nvidia Collaboration - Alibaba officially announced a partnership with Nvidia to develop Physical AI, launching seven new large model products. This collaboration encompasses various aspects of AI, including data synthesis, model training, and environment simulation [11][15]. Sector Performance - In the S&P 500, seven out of eleven sectors declined, with materials and real estate leading the losses at 1.59% and 1.01%, respectively. The energy and utilities sectors saw gains of 1.23% and 0.73% [12]. Notable Stock Movements - Intel shares rose by 6.41%, with reports of the company seeking investment from Apple. Nvidia's stock fell by 0.82%, following a series of stock sales by CEO Jensen Huang as part of a pre-planned strategy [13][14]. Chinese Stocks Performance - Most popular Chinese stocks saw gains, with the Nasdaq China Golden Dragon Index rising by 2.83%. Alibaba surged over 8%, while other notable Chinese companies also experienced significant increases [15]. Mining Sector Incident - McMoRan Copper & Gold shares dropped by 16.95% after a landslide incident at its Indonesian mine resulted in fatalities and a projected delay in production recovery until 2027 [15].