#夏日创作营 Citigroup is shifting its focus from the “Big Seven” to a broader AI growth slate, amid rotation in 2026. A team led by Citigroup’s chief strategist Scott Chronert says the “Big Seven” framework is outdated for evaluating US artificial intelligence investment opportunities. The firm’s latest report, published in July 2026, says the “Big Seven” structure for assessing broad-market growth momentum has “reached its end,” because the stock performance of these seven largest US tech companies has diverged significantly, including Amazon, Nvidia, Meta, Apple, Microsoft, Tesla and Alphabet. Citigroup advises investors to shift their focus to a broader “Growth Cluster,” which includes traditional mega-cap tech stocks as well as companies tied to AI infrastructure. The cluster currently accounts for more than 50% of the total market capitalization of the S&P 500 and contributes about 48% of index returns. The firm notes that despite concerns about market valuations, the Growth Cluster’s 12-month forward price-to-earnings multiple remains attractive, sitting at the 66th percentile within its 30-year historical range, driven by strong expectations for earnings growth before 2027.