Mainland China Stocks Fall as Technology Shares Slide

Mainland Chinese stocks fell sharply on Monday, with technology shares leading the decline and the CSI 300 closing at its lowest level since August 2025. The benchmark dropped about 2.2%, while the technology-heavy STAR 50 fell 4.1%, according to market reports. The selling reflected several concerns, but the reports did not establish how much each contributed. Chipmakers and optical-component companies were among the hardest hit. Semiconductor Manufacturing International Corp. fell about 3.7% and Cambricon Technologies lost around 5.7% in one account. Zhongji Innolight and Eoptolink also declined as investors weighed possible U.S. restrictions on Chinese optical transceivers. The reports described the restrictions as proposals, not measures that had taken effect. A separate concern for domestic chipmakers followed a report that China’s Ministry of Industry and Information Technology had asked companies including Alibaba and ByteDance how many Nvidia RTX Pro 5500 chips they wanted and how they planned to use them. The inquiries were described as a possible step toward approving purchases, not a decision authorizing sales.