中概股走强，阿里巴巴涨超4%，黄金、白银突然跳水

Group 1 - The U.S. stock market showed mixed performance with the Dow Jones down 0.19%, S&P 500 down 0.02%, and Nasdaq up 0.29% as of October 2 [1] - The semiconductor sector strengthened, with the Philadelphia Semiconductor Index rising 1.7% to a new historical high, and notable individual stocks like ASML and AMD increasing over 2% [2] - Alibaba's U.S. stock price target was raised by JPMorgan from $170 to $245, citing growth in cloud computing and e-commerce as key drivers for higher valuation [3] Group 2 - Significant inflows into Alibaba's Hong Kong stock were noted, with a net buying amount of approximately 757.09 billion HKD in September, which is ten times that of Tencent Holdings [3] - Major international institutional investors and sovereign funds have been increasing their stakes in Alibaba, with notable investments from Ark Invest and the Norwegian Sovereign Fund [4] - Precious metals experienced a sharp decline, with spot gold dropping 0.92% to $3829.639 per ounce and spot silver decreasing by 2.27% to $46.245 per ounce [4]