On October 27, 2025, the three principal A-share indices kicked off the trading day with a collective upward opening. The Shanghai Composite Index exhibited resilience amidst market fluctuations, steadily gaining ground. Meanwhile, the ChiNext Index initially ascended but then experienced a slight retreat. By the midday trading break, the Shanghai Composite Index had advanced by 1.04%, the Shenzhen Component Index recorded a 1.26% increase, and the ChiNext Index posted a 1.54% rise. On the trading floor, sectors such as the West Coast Economic Zone, CPO (Co-Packaged Optics), photolithography equipment, lithium mining, and controllable nuclear fusion showcased robust performance. The securities sector witnessed notable volatility, with Xiangcai Securities surging to its daily limit during intraday trading. Memory chip stocks, along with other related sectors, spearheaded the market's upward momentum, whereas the internet and certain other sectors faced declines.