美股三大指数录得四连涨，道指、标普、英伟达续收新高

Market Performance - US stock market opened lower but closed higher, with all three major indices rising for four consecutive days, marking new historical highs for the Dow Jones and S&P 500 [1][2] - As of the close, the Dow Jones Industrial Average rose 0.09% to 46,441.10 points, the S&P 500 increased by 0.34% to 6,711.20 points, and the Nasdaq Composite gained 0.42% to 22,755.16 points [1][2] Economic Context - The US federal government experienced a shutdown for the first time in nearly seven years, impacting market sentiment [2] - Historical data suggests that the stock market tends to perform steadily during government shutdowns, but current economic factors raise concerns about labor market slowdowns and inflation risks [2] Notable Stock Movements - Nvidia's stock rose 0.35% to $187.24, reaching a market capitalization of $4.558 trillion, while the Philadelphia Semiconductor Index also hit a new high, increasing by 2.05% [3][5] - Major tech stocks mostly rose, with Microsoft up 0.34%, Apple up 0.32%, and Google up 0.82%, while Meta Platforms fell by 2.32% [5][6] Company News - Microsoft plans to integrate AI services into its Office software to compete with OpenAI's ChatGPT, launching a new premium version of Microsoft 365 at $19.99 per month [8] - Google has laid off over 100 design-related positions in its cloud computing department, affecting teams focused on user experience research [9] - Intel is in preliminary talks to potentially include AMD as a foundry customer, although details on the extent of any agreement remain unclear [10] - General Mills has approved a restructuring plan that will close certain production facilities, incurring approximately $82 million in restructuring costs [11]