[Analysis of listed stocks on September 23: Short-term sentiment continues to cool down and the PCB sector returns strongly] A total of 51 stocks hit the daily limit today, and a total of 12 stocks were listed, including 9 stocks with three consecutive boards or above. A total of 24 stocks were listed on the previous trading day, and the promotion rate of listed stocks was 37.5% (excluding ST shares and delisted stocks). In terms of individual stocks, more than 3,500 stocks in the market fell, short-term sentiment continued to cool down, and the board height dropped to the 4th board. Yesterday's high-standard Hua Ci, Inner Mongolia Xinhua, and Nanhua Biotech were all off the board, but they all closed in the red, and the overall acceptance was acceptable. In terms of sectors, the real estate sector broke out in the early trading. Huayuan Holdings, I Love My Home, and Huali Family all advanced to 3 consecutive boards. They once spread to various building materials, but the overall stamina was insufficient and fell back to the close. The PCB sector made a strong comeback. Aohong Electronics had 7 boards in 9 days with 2 consecutive boards, and Daya Shengxiang had 4 consecutive boards. Among them, the new branch vector network analyzer has been fermented, and Youli Deutsche and Puyuan Jingdian both hit the daily limit of 20CM, and Diankesi Instrument rose by more than 13%. On the news, Huatai Securities Research Report pointed out that as the data center network evolves to 800G and 1.6T, the requirements for signal integrity and yield control of high-speed connectors, cables and high-end PCBs continue to increase, driving the demand for vector network analyzer (VNA) testing.