Applied Materials is trading 3.91% down at $478.10 as semiconductor stocks sell off amid fears over AI investment and Chinese competition. - Reported catalysts include China’s CXMT advancing a denser memory-chip design and Broadcom CEO Hock Tan warning about AI-investment expectations. - The sector context shows SOXX down 2.64%. - Applied Materials’ October 12 announcement of its $5 billion EPIC Center predates the decline and does not explain it.