[Review: The Shanghai Stock Index bottomed out and recovered 3,800 points, PCB concept stocks rebounded collectively] On October 13, the market bottomed out and rebounded, the Shanghai Stock Index closed in the red, and the Mass Entrepreneurship and Innovation Index once fell by more than 3%. The turnover of Shanghai and Shenzhen stock markets was 1.68 trillion, which was 138.1 billion higher than the previous trading day. More than 2,900 stocks across the market rose. On the market, the PCB concept exploded, with Xunjiexing reaching its daily limit of 20CM, Ultrasonic Electronics, Zhongjing Electronics, Concord Electronics, and Aohong Electronics reaching their daily limit; the concept of ice and snow economy was active, with Bingshan Cold and Hot, Dalian Sunya, Jingxue Energy Saving, Snowman Group, and Changbaishan rising by their daily limit; Disperse Dyestuffs Jianxin Shares rose by their 20CM limit, and Yabang Shares rose by their daily limit; Military Aviation Technology rose by its limit, and Guoke Military Industry rose by more than 10%. On the downside, the battery sector weakened, Zizhu Hi-Tech fell by the limit, and Haike Xinyuan, Xiongtao Shares, etc. fell. As of the close, the Shanghai Composite Index rose 0.1%, the Shenzhen Component Index fell 0.25%, and the ChiNext Index fell 0.18%.