[PCB concept rebounded in shock, Concord Electronics hit the daily limit] On November 4th, the PCB concept rebounded in early trading, Concord Electronics hit the daily limit, Mankun Technology rose by more than 10%, Delphi Technology, Huazheng New Materials, International Composites, Jinan Guoji, etc. followed suit. On the news, some industry chain companies revealed to reporters that the company's HDI and high-multilayer PCB inventory production lines are currently full of orders, and the order volume has exceeded the upper limit of the existing production capacity, and a new round of production expansion has been launched. According to a research report released by Citi during the year, the global AI PCB market size will reach 152 billion yuan in 2026, a year-on-year increase of 86%.