Key Takeaways:
The S&P 500 closed near flat at 7,406.60 as a selloff in memory chip and semiconductor stocks offset gains in defensive sectors, with the benchmark alternating between gains and losses through the session. The Dow Jones Industrial Average rose 0.24% to 52,060, while the Nasdaq 100 fell 0.89% to 27,919.60, showing a sharp divergence between value and growth stocks.
The move followed ChangXin Memory Technologies' blockbuster debut on Shanghai's STAR Market, where the stock surged more than 500% to a market capitalization of about $540 billion, according to exchange data. CXMT is the world's fourth-largest DRAM maker with an 8% market share, trailing Samsung at 36%, SK Hynix at 29% and Micron at 24%. Apple is reportedly testing CXMT's DRAM chips, adding weight to concerns that Chinese memory could reach top-tier customers, though the company remains constrained by US export controls on advanced chipmaking tools.
The memory chip index plunged 5.8%, while the broader semiconductor gauge fell 2.4%. SanDisk led the selloff with an 11.6% decline, followed by Lumentum down 6.1% and ASML ADR down 5.8%. AMD, Nvidia, Western Digital, Lam Research and Teradyne each fell at least 4.2%. The declines followed extraordinary year-to-date gains: SanDisk had climbed 505% heading into Monday, while Micron was up 223% and Western Digital had gained 202%, making the sector vulnerable to profit-taking. On the upside, Shopify surged 11.2%, Workday gained 8.8% and Thomson Reuters rose 8.2%.
The rotation into defensive sectors showed investors hedging against further tech weakness. Consumer staples and telecom each rose at least 1.5%, while energy was the worst-performing sector, down 2.2%, as lower oil prices weighed on exploration and production names after a pause in US-Iran hostilities. Utilities fell 1.4% and technology dropped 1%. The Roundhill Memory ETF declined 4%, reflecting the concentrated selling across memory names, where Samsung, SK Hynix and Micron together account for 72% of the fund's net assets.
The memory sector faces a key test Tuesday when SK Hynix reports second-quarter results after the US close. South Korea over the weekend unveiled a $950 billion AI initiative involving Samsung, SK Group and US tech partners, which could provide a counterweight to the competitive threat from CXMT. Research desks at Morgan Stanley and Mizuho have characterized the recent memory weakness as a buying opportunity rather than the start of a downturn, according to published notes. Micron's next earnings report is scheduled for September 28.
This article is for informational purposes only and does not constitute investment advice.
