Micron heads for worst month in 11 years as China chip fears mount

Micron Technology is on track for its steepest monthly decline since 2015 as investors price in the threat from China's rapidly maturing semiconductor supply chain.

China's push to produce its own memory chips and manufacturing equipment is rattling US semiconductor investors, with Micron Technology heading for its worst monthly drop in 11 years.

"The investment narrative for semiconductor stocks has already weakened, and news of domestic DUV development has cooled sentiment further," Han Ji-young, an analyst at Kiwoom Securities, said.

Micron shares have fallen roughly 25% in July, their steepest monthly decline since 2015, as a confluence of China-related headwinds compounds pressure on the memory-chip sector. Chinese memory maker CXMT debuted on the Shanghai Stock Exchange on Monday in Asia's largest IPO, raising concerns that a new competitor could flood the market with supply. Separately, reports that Chinese companies are developing domestic deep ultraviolet (DUV) lithography equipment — a critical tool for chip fabrication — have reignited fears that Beijing could accelerate its semiconductor self-sufficiency timeline.

The selloff extends beyond Micron. Samsung Electronics fell 13.4% on Tuesday, its worst single-day drop in nearly two decades, while SK Hynix dropped 14.7%. Together, the two South Korean memory giants account for nearly half of the benchmark KOSPI index, which closed down 10.8% — its biggest one-day decline since March 2020. SK Hynix's US-listed shares closed at $143.02, below their $149 initial public offering price from earlier this month, a sign of how quickly sentiment has turned against AI-chip beneficiaries.

The rout reflects a three-pronged threat to the semiconductor industry's China thesis. CXMT's listing signals that Chinese memory production is scaling faster than many investors anticipated. The company could emerge as a more formidable DRAM supplier, increasing the risk of oversupply and weaker pricing, according to NH Investment & Securities analyst Ryu Young-ho.

Second, reports that Apple has been lobbying the Trump administration to allow Chinese-made chips in some of its products have unsettled investors already concerned about market share erosion. Third, the growing popularity of low-cost Chinese open-source AI models such as Kimi K3 has raised questions about whether future AI workloads will prove less intensive than expected — potentially reducing demand for the advanced high-bandwidth memory (HBM) chips that have driven Micron's and SK Hynix's recent growth.

The pain is not confined to memory. Nvidia fell nearly 5% on Monday after a Wall Street Journal report that the company could provide a roughly $250 billion financial backstop for an OpenAI data center project, raising concerns that AI chip leaders may be financing their own customers. AMD dropped 5.2%, while Lam Research fell 4.5%, extending a sector-wide selloff.

For Micron, the stakes are particularly high. The company reports its fiscal fourth-quarter results in September, and analysts will be watching for commentary on China exposure and pricing trends. The broader question for investors is whether China's chip ambitions represent a multi-year structural threat or a near-term sentiment shock that will fade as AI demand continues to grow.

This article is for informational purposes only and does not constitute investment advice.