美国科技股连遭抛售 AI主题“清算”时刻已至？华尔街这么看

Group 1 - The recent decline in U.S. tech stocks indicates the fragility of AI-driven trading, with the Nasdaq Composite Index dropping approximately 2% over the past week [1] - Nvidia's stock fell by 3.5%, resulting in a market cap loss of over $155 billion, while Palantir Technologies has seen a six-day consecutive decline, losing $73 billion in market value [1] - Tech stocks had previously surged over 50% from their April lows, significantly outperforming the S&P 500's 29% increase during the same period, leading to high valuations [1] Group 2 - Investors are cautious about the excessive rise in AI-driven tech stocks, with Nvidia's stock up about 30% and Palantir's stock doubling this year [2] - The tech sector's price-to-earnings ratio has reached around 30 times expected earnings for the next 12 months, the highest level in a year [2] - A study from MIT indicates that 95% of organizations have not seen returns on AI investments, contributing to investor caution [2] Group 3 - Market sentiment is cautious ahead of Federal Reserve Chair Jerome Powell's speech at the Jackson Hole annual symposium, with an 84% probability of a rate cut in the upcoming meeting [3] - Investors are adjusting their positions in anticipation of Powell's remarks, which could influence market volatility, especially for high-valuation tech stocks [3][4] - Seasonal trends suggest that August and September are traditionally weak months for the S&P 500, prompting investors to reduce risk exposure [4]