Zheng Quan Shi Bao·2025-09-01 11:50Group 1 - The semiconductor sector in Japan and South Korea experienced a significant sell-off, with major companies like Advantest and SK Hynix seeing declines of over 9% and 5% respectively, influenced by a sell-off in US tech stocks [1][3] - Concerns about the future performance of AI chip companies arose after underwhelming earnings guidance from US chip giants, leading to fears of slowing growth in the AI chip market [1][3] - Nvidia's reliance on a small number of customers was highlighted, with nearly 40% of its second-quarter revenue for fiscal year 2026 coming from just two clients, raising questions about its dependency on these major customers [1][3][4] Group 2 - The Philadelphia Semiconductor Index dropped over 3%, with notable declines in companies like Marvell Technology and Oracle, further impacting investor sentiment towards AI chip stocks [3] - The overall valuation of the US stock market has reached unprecedented levels, with the S&P 500's price-to-sales ratio hitting 3.23, surpassing the peak during the dot-com bubble [7] - Analysts express skepticism about the sustainability of high valuations for tech giants, suggesting that fundamental performance will ultimately dictate stock prices [8]