Taiwan’s stock market has recently consolidated around 45,000, but PCB shares broke higher, led by Taiflex Scientific (8039.TW), a flexible copper clad laminate (FCCL) maker whose stock surged nearly 100% from late-July lows in one month. On August 26, the shares locked limit-up at NT$320.5 for a second consecutive session, setting a record high. The rally centers on Taiflex’s PTFE (polytetrafluoroethylene) material, which could replace glass fiber cloth in high-speed substrate applications and potentially enter Nvidia’s next-generation AI platform supply chain. Market sources say the Rubin Ultra platform could shift its orthogonal backplane materials from M9 resin plus Q-cloth to clothless technology using PTFE with silica fillers for transmission speeds of 337G and above. Taiflex is undergoing certification and could become the world’s second supplier after China’s Shengyi Technology, with volume production potentially starting as early as 2027. Investment trusts bought a net 1,119 lots on August 25, while foreign investors and day-trade momentum funds bought 4,539 lots, helping drive the shares to NT$291.5 with volume near 60,000 lots. First-half net profit rose 257% year-over-year to NT$412 million, while second-quarter profit increased 634.34% year-over-year to NT$240 million. Analysts remain cautious about the time needed to reach mass production and the risks of chasing the stock, but say the longer-term material-upgrade trend remains intact.