Summary · why it matters
Semiconductor stocks fell in early trading on Monday, with the PHLX Semiconductor Index declining 2% as fears of increased competition from China spread across the sector. US-listed shares of memory and storage leaders Micron Technology and SK Hynix tumbled around 4%, while AI chip heavyweight Nvidia dropped 1% and AMD fell more than 2%. The sell-off followed Alibaba's unveiling of its most powerful AI model yet, Qwen3.8-Max, and a research note highlighting that DeepSeek's latest model is more than 100 times cheaper than Anthropic's Claude Fable 5. Semiconductor equipment makers ASML, Applied Materials, and Lam Research also declined, as chip stocks have now fallen more than 20% from their June record high amid growing concerns over hyperscaler AI spending and China's advancement in affordable AI models.