欧美股指集体下跌，芯片龙头涨近8%

Market Overview - US stock markets collectively declined, with major indices showing slight decreases: Dow Jones down 0.17%, Nasdaq down 0.06%, and S&P 500 down 0.06% [1] - The US technology sector also faced a downturn, with the major tech index falling by 0.3% [3] Individual Stock Performance - Apple shares fell over 1% to $255.53, while Alphabet (Google) decreased by 0.82% to $330.43, Nvidia dropped 0.44% to $186.23, and Tesla declined 0.22% to $437.63 [5] - In contrast, Amazon and Microsoft saw slight gains, with Amazon up 0.38% to $239.09 and Microsoft up 0.70% to $459.87 [5] Semiconductor Sector - The Philadelphia Semiconductor Index rose by 1.15%, driven by Micron Technology's significant increase of nearly 8% due to insider buying of $7.8 million in company stock, indicating confidence in future performance [6] - Other semiconductor stocks such as Broadcom, Applied Materials, and Lam Research also experienced gains of over 2% [6] Commodity Market - Precious metals experienced volatility, with London spot gold and COMEX gold futures both showing slight declines of 0.37% and 0.49% respectively, while silver prices fell by over 2% [11] - The fluctuations in precious metals are attributed to changes in margin requirements by the CME Group, which may lead to increased market volatility [12] International Market - Chinese stocks listed in the US saw a decline, with the Nasdaq Golden Dragon China Index dropping by 1.15%, and notable declines in companies like Vipshop and Century Internet, which fell over 8% [10] - European markets also closed lower, with France's CAC40 down 0.65%, the UK's FTSE 100 down 0.04%, and Germany's DAX down 0.22% [10]