美股翻绿，热门中概股深夜爆发，小鹏涨超7%，理想、蔚来集体上涨，钯金暴涨10%

Market Overview - On the first trading day after Christmas, U.S. stock indices opened mixed, with the Nasdaq up 0.14% and the S&P 500 up 0.08%, while the Dow Jones fell 0.03%. However, all three indices dropped later, with the Chinese tech index showing strong performance, rising by 1% [1][2]. Company Highlights - Nvidia shares rose nearly 1.5% after U.S. President Trump announced that the government would allow Nvidia to sell H200 AI chips to China. Additionally, Nvidia's acquisition of AI chip startup Groq for approximately $20 billion set a record for the largest deal ever [2]. - Sidus Space, a space concept stock, initially surged over 40% and had a cumulative increase of over 160% for the week, although it later retreated to a 24% gain [3]. - Chinese tech stocks saw significant gains, with Dingdong Maicai rising over 20%, Xiaopeng up over 7%, and Li Auto and NIO both increasing by over 2% [3][4]. Commodity and Precious Metals - Gold and silver futures prices continued to rise, with spot gold surpassing $4,527 and spot silver reaching $75, marking the highest premium levels since 1980. Copper futures also hit a historical high, with a nearly 2% increase [7][9]. - Palladium experienced a significant increase of 10%, reaching $1,865.13 per ounce [8]. Cryptocurrency Market - The cryptocurrency market saw a decline, with Bitcoin dropping below $87,000 and Ethereum falling below $3,000. Over 95,000 traders faced liquidation in the past 24 hours [10].