The S&P 500 turned negative and the Nasdaq 100 fell 0.7 percent on July 27 as a deepening semiconductor selloff dragged technology shares lower, with the benchmark index reversing earlier gains.
"Semiconductor crowding is a clear risk, and AI spending is no longer an automatic win for chipmakers," said Andrew Tyler, head of market intelligence at JPMorgan, whose tactical positioning monitor flashed a buy signal for the broader S&P 500.
The Philadelphia Stock Exchange Semiconductor Index has lost 25 percent since its June 22 high, entering bear-market territory, while the MSCI World Semiconductor index dropped 16 percent in July alone. The latest leg lower was triggered by news that a state-backed Chinese firm had begun mass producing immersion DUV lithography tools and that CXMT had completed its memory-chip IPO, intensifying competition fears. U.S. chip names Intel, AMD, Sandisk, Western Digital and Seagate each fell more than 5 percent. South Korea's Kospi sank 11 percent, with Samsung Electronics and SK Hynix each falling more than 14 percent, as correlation data showed a rapid unwind of the trade that shorted Hong Kong tech to fund bets on Korean chipmakers.
The rotation out of technology benefited defensive and value-oriented sectors, with healthcare, consumer staples and materials leading gainers. The Cboe Volatility Index surged to a one-month high as traders hedged against further downside. The U.S. 10-year Treasury yield edged lower as the equity selloff boosted demand for government bonds, while oil rebounded with WTI rising as much as 5 percent to top $83 a barrel after fresh Middle East fighting renewed threats to energy flows.
The selloff reflects mounting concern that Big Tech's artificial intelligence spending — with Nvidia's $750 billion in infrastructure deals stoking debt worries — may not deliver proportional returns. Meta, Amazon and Microsoft are due to report earnings this week, with capital expenditure plans set to determine whether the rotation deepens. Apple briefly touched $5 trillion in market value on July 28 as investors favored its low-capex AI strategy over hyperscaler rivals, highlighting the divergence within technology. The Nasdaq 100 now sits about 9.5 percent below its June 2 record, just shy of correction territory, with the next catalyst for direction hinging on Big Tech earnings and any further escalation in U.S.-China chip tensions.
This article is for informational purposes only and does not constitute investment advice.