美股三大指数集体高开！受益关税豁免政策，苹果、英伟达股价大反弹

Group 1 - The U.S. stock market opened significantly higher, with the Dow Jones up 1.26%, Nasdaq up 2.35%, and S&P 500 up 1.74% [1] - Chip stocks experienced broad gains, with Micron Technology rising over 7%, AMD and Intel up about 4%, Nvidia up nearly 3%, Dell Technologies up nearly 9%, Apple up nearly 7%, and HP up over 5% [2] - Goldman Sachs reported better-than-expected earnings, with Q1 net revenue of $15.06 billion, a 6$40 billion approved by its board [2] Group 2 - The Nasdaq Golden Dragon China Index saw an expanded gain of 4.0%, reaching 6785.76 points, with Pinduoduo up over 6%, JD.com up nearly 6%, Alibaba up over 5%, and NIO and Xpeng Motors up nearly 5% [2] - Citigroup downgraded its rating on the U.S. stock market from overweight to neutral, citing recent developments such as DeepSeek, European fiscal positions, and trade tensions as reasons for diversifying investments outside the U.S. [3] - Citigroup also lowered its year-end target for the S&P 500 index to 5800 points, based on a revised earnings per share forecast of $255, influenced by tariff assumptions and signs of recent macroeconomic slowdown [4]