[PCB concept has repeatedly strengthened, Guanghe Technology 2-connected board] On September 22, the PCB concept has repeatedly strengthened, Guanghe Technology 2-connected board, Yihao New Materials, Kaihua Materials rose more than 10%, Xianfeng Holdings hit the daily limit, Welco, Hongshida, Shennan Circuit, and Xingsen Technology rose more than 5%. In terms of news, recent research reports from many institutions pointed out that as the prices of upstream raw materials continue to rise, PCB (printed circuit board) manufacturers have successively started to re-quote prices. This phenomenon marks the opening up of the price transmission mechanism of the industrial chain. It is expected that the third quarter of 2026 will become the starting point for the sector's profit improvement.