[Review: The Shanghai Stock Exchange Index shrank and fluctuated and ended in the red. PetroChina hit an 18-year high] On October 26, the three major indexes had mixed gains and losses. The Shanghai Stock Exchange Index closed in the red, and the ChiNext Index and the Shenzhen Component Index both fell by more than 1%. The turnover of Shanghai and Shenzhen stock markets was 1.61 trillion, a decrease of 347.5 billion from the previous trading day. More than 3,100 stocks across the market fell. On the market, Robot Saifutian, Zhengyu Industrial, Duolun Technology, Xiangyang Bearing 3-link board, Wanxiang Qianchao, Fenglong Shares, Yongchuang Intelligent 2-link board; the concept of data elements is rapidly strengthening, Massive Data, Business Bao, Yanhua Intelligent daily limit, Century Hengtong The 20CM daily limit was hit during the session; the consumer sector was active, with Guifaxiang, Qingdao Food, Sunshine Dairy, Bestore, and Huangtai Liquor hitting the daily limit; the oil and gas sector fluctuated and rebounded during the day, with PetroChina rising nearly 5%, hitting a new high since May 2008. On the downside, computing hardware stocks weakened, Huazheng New Materials, Aohong Electronics, and Huashengchang fell to the limit, while Shengyi Technology, Nanya New Materials, Dongshan Precision, etc. fell one after another. As of the close, the Shanghai Stock Exchange Index rose 0.19%, the Shenzhen Component Index fell 1.19%, and the ChiNext Index fell 1.71%.