Bloomberg ETF analyst says weak U.S. stock market breadth is not a major concern

Bloomberg ETF analyst Eric Balchunas said weak breadth in the U.S. stock market should not be viewed as a major warning sign. In a post on X, he argued that narrow leadership has long been part of the market’s structure rather than a new problem. He pointed to historical data showing that, over the past 100 years, just 4% of stocks accounted for all net wealth creation in the U.S. market, while roughly half of listed companies underperformed U.S. Treasury bonds. Balchunas also said investors may be understating the operating reach of the market’s largest companies. He noted that Microsoft and Google have each acquired 270 companies, making them resemble small countries more than standalone firms. On that basis, he suggested investors may want to think of the so-called Magnificent Seven as the equivalent of "700 giants," with the current leadership of the S&P 500 potentially tied to hundreds of companies rather than only a handful of names.