Analysis:Sizzling semiconductor trade at risk of cooling - and stalling US stocks rally

Semiconductor stocks have led a sharp U.S. market rally since late March, with the Philadelphia SE Semiconductor index jumping 64%—far outpacing the S&P 500’s 17% gain. The surge stems from AI-driven demand for chips, boosting companies like Nvidia, Micron Technology, and Advanced Micro Devices, which more than doubled in value, while Intel nearly tripled. Investors are divided over whether the sector’s momentum is sustainable. Some compare the rapid gains to the 1999-2000 tech bubble, with Chase Investment Counsel reducing its Qualcomm exposure but retaining stakes in AMD and Nvidia. High-profile investor Michael Burry remains cautious, holding puts on the iShares Semiconductor ETF. The sector’s dominance in the S&P 500—now 18% of the index—means any correction could ripple across markets. Semiconductors and memory stocks accounted for 70% of the S&P 500’s $5.1 trillion market cap growth in 2026, according to JonesTrading. Yet underlying weakness persists: fewer than half of S&P 500 stocks trade above their 50-day moving averages, signaling potential fragility. Analysts warn that if semiconductor demand cools, the broader market could face instability. Fundamentally, the industry’s profit and revenue growth remain strong this year, but investor sentiment is shifting. Some firms, like Morgan Stanley, argue the sector’s technical and fundamental strength justifies optimism, while others brace for a pullback. The debate highlights how vulnerable the market has become to semiconductor performance, with AI-driven demand acting as both a catalyst and a potential risk factor.