Driven by US tech stock rallies, Taiwan's stock market opened high today, soaring over 650 points to hit a record high of 42,408 points in early trading. However, the index reversed course and fell mid-session as selling pressure emerged. TSMC's gains shrank to near flat, while Hon Hai, UMC, and Largan Precision performed strongly. Conversely, the memory, ABF substrate, and PCB sectors suffered heavy losses, with many high-priced tech stocks experiencing significant volatility.