Wei High 20CM hit the limit up, Shengyi Electronics rose more than 15% to hit a historical high, Mankun Technology, Victory Giant Technology, Avary Holding, Olympic Circuit Technology and other stocks rose by more than 5%. Industrial Securities research reports pointed out that high-speed PCBs are benefiting greatly from the Ethernet switch market outbreak. With the increasing demand for transmission rates, PCB losses will also increase, requiring the use of lower-loss CCL board materials to match equipment demand. At the same time, the number of PCB layers also needs to increase, bringing about a significant growth in the value of PCBs.