希捷科技、西部数据领涨美股，AI外溢还是泡沫迹象？

Group 1 - The core viewpoint of the articles highlights that traditional hardware companies are experiencing significant stock price increases due to the AI infrastructure investment wave, raising questions about whether this is a genuine market trend or a bubble before a potential crash [1][2]. - Seagate Technology has surged by 156% this year, becoming the best-performing stock in the S&P 500, while Western Digital and Micron Technology have also seen substantial gains of 137% and 93%, respectively [1][2]. - Major tech companies are investing hundreds of billions of dollars annually in semiconductors, networking equipment, and data center power supplies to support AI workloads, benefiting traditional storage manufacturers [1][2]. Group 2 - Despite the stock price surges, the valuations of Seagate, Western Digital, and Micron remain relatively reasonable, with price-to-earnings ratios around 10 times, compared to the S&P 500's expected P/E ratio of 23 times [2]. - Benchmark Co. analyst Mark Miller raised Seagate's target price to $250, indicating a potential upside of over 13% from its recent closing price, citing strong product demand as a key factor [3]. - Concerns about a market bubble are growing, as the rapid stock price increases for these companies exceed analyst expectations, with Seagate trading over 20% above the average target price [4]. Group 3 - The AI hype is also driving stock price increases in other traditional sectors, such as Vistra Corp, which has risen by 53% this year, and Broadcom, which has reached a market capitalization of $1.6 trillion [4]. - Oracle has become the tenth largest company in the S&P 500 due to demand for cloud computing services, with a single-day stock price surge of 36% following its earnings report [5]. - There are warnings that the current AI excitement may be overhyped, similar to the internet bubble, with actual application developments expected to take longer than anticipated [5].