U.S. stock market concentration hits 35-year high, analysts warn of a potential pause

Odaily reported that driven by AI optimism and strong earnings reports, the S&P 500 and Nasdaq both hit record highs. However, this rally notably lacks breadth, with gains largely concentrated in mega-cap tech stocks.

UBS analysts noted that in the six weeks leading up to May 15, the market-cap-weighted S&P 500 outperformed its equal-weight counterpart by the largest margin in at least 35 years. Given that most of the market's value growth was fueled by AI-focused mega-cap tech stocks, UBS advised investors to reduce overly concentrated positions and guard against concentration risk.

UBS also stated that as earnings season draws to a close and market attention shifts back to the unresolved situation in the Middle East, the market could enter a period of temporary consolidation.

Ipek Ozkardeskaya, Senior Market Analyst at Swissquote Bank, said she has been monitoring the issue of market breadth. She noted that most of the gains are currently concentrated in a handful of tech companies that are "priced to perfection." "If anything goes wrong with their pricing logic, we could see a bubble-like collapse," she added. (Jin Shi)