US Stock Market Live Updates: US stocks end higher as AI rally lifts Nasdaq

US Stock Market Live Updates: Memory chip stocks stumble as market questions AI spending sustainability, Bloomberg reportsMemory and storage manufacturers including Sandisk, Micron, Seagate, and Western Digital have experienced a sharp second-half momentum reversal despite reporting strong financial results. While demand driven by the artificial intelligence infrastructure buildout initially sent these shares soaring, growing investor skepticism regarding the durability and return on massive corporate capital expenditures has pushed all four stocks into the bottom decile of the S&P 500 performance rankings since mid-year. Market participants are increasingly weighing the risks of debt-financed technology investments alongside broader macroeconomic headwinds, even as hyperscalers affirm continued capital allocation toward AI hardware. Although analyst consensus projects significant long-term upside potential and historical valuation multiples remain suppressed relative to the broader index, the sector now faces heightened scrutiny as investors demand sustained earnings follow-through before restoring previous premium valuations.