美股一周回顾：标普跌0.47%、纳指跌0.71%，十家公司占三季度盈利增长预期约三分之二
10月19日至23日一周，美国股市涨跌互现。标普500指数全周下跌0.47%，收于7,623.68点；纳斯达克综合指数下跌0.71%，收于25,955.34点；道琼斯工业平均指数上涨0.41%，收于52,215.16点，为连续第三周上涨。
一周走势几经反复。周初，市场在人工智能概念带动下反弹，投资者迎接密集发布的企业财报；周中，两家大型科技公司组建委员会评估潜在合并的消息提振市场，纳指单日涨逾1%，标普连续第三个交易日收高；周四，人工智能债务忧虑重燃，油价因地缘局势回升，纳指单日跌逾2.5%，标普跌逾1%，分别为今年6月与7月以来最陡的单日跌幅；周五，道指收跌逾1%，标普与纳指继续下跌。
比单周涨跌更受关注的，是盈利预期的集中度。据《华尔街日报》援引 FactSet 与道琼斯市场数据，分析师预计标普500成分股第三季度盈利同比增长约30%，但仅十家公司——包括英伟达、美光、博通与 Meta 等——就占了这一增长预期的约三分之二，其中英伟达与美光两家合计占34%。
来源：GSM·美国
U.S. Stocks Weekly Review: S&P 500 Falls 0.47% and Nasdaq 0.71%; Ten Companies Account for About Two-Thirds of Expected Q3 Earnings Growth
U.S. stocks finished mixed in the week of October 19 to 23. The S&P 500 fell 0.47 percent for the week to close at 7,623.68, the Nasdaq Composite declined 0.71 percent to 25,955.34, and the Dow Jones Industrial Average gained 0.41 percent to 52,215.16, its third straight weekly advance.
The week swung back and forth. It began with an AI-led rebound as investors looked ahead to a heavy slate of earnings reports. Midweek, reports that two large technology companies had formed a committee to evaluate a potential merger lifted the market, sending the Nasdaq up more than 1 percent in a day and giving the S&P 500 a third straight winning close. On Thursday, worries over AI-related debt returned while oil prices rose on geopolitical concerns: the Nasdaq slid more than 2.5 percent and the S&P 500 fell more than 1 percent, their steepest single-day declines since June and July respectively. On Friday, the Dow closed down more than 1 percent, with the S&P 500 and Nasdaq also under pressure.
More closely watched than the weekly moves is the concentration of expected earnings growth. According to The Wall Street Journal, citing FactSet and Dow Jones Market Data, analysts expect S&P 500 third-quarter earnings to rise about 30 percent from a year earlier, but just ten companies — including Nvidia, Micron, Broadcom and Meta — account for roughly two-thirds of that expected growth, with Nvidia and Micron alone contributing 34 percent.
Source: GSM·USA
来源：GSM·美国（原文链接）
图片来源：纽约证券交易所交易大厅。图片：Carol M. Highsmith，美国国会图书馆藏，公共领域 — via Wikimedia Commons
