U.S. Stocks Drive Higher Open, Index Holds Above 47000
AI buying returned and falling international oil prices lifted sentiment, with U.S. stocks all higher on Tuesday and the Philadelphia Semiconductor Index up over 3%, while Taiex futures after-hours rose 774 points. The Taipei stock market opened on the 28th up 306.56 points at 46402.79, hit an intraday high of 47060.46, holding above the 47000 mark, and closed up 939.35 points, up about 2.04%, at 47035.58, with turnover of 7221.35億元. The OTC index opened up 3.26 points at 382.46, hit an intraday high of 394.45, and closed up 15.25 points, up about 4.02%, at 394.45, with turnover of 1653.57億元.
Heavyweights Lead, High-Priced Stocks Rise Together
Heavyweight stocks all strengthened. TSMC opened up 20 at 2420, hit an intraday high of 2430, and closed up 25, up about 1.04%, at 2425, contributing about 199 points to the broader market. MediaTek opened up 80 at 4040, hit an intraday high of 4245, and closed up 275, up about 6.94%, at 4235. Delta Electronics opened up 55 at 1565, and closed up 40, up about 2.65%, at 1550. High-priced stocks rose in tandem, with Aspeed jumping to 17400 intraday and closing up nearly 8% at 17295; King Slide hitting an intraday high of 10290, retaking the 10000 mark, and closing up over 3% at 10150; Chunghwa Precision Test Tech, Global Unichip, Genius Electronic Optical and Gold Circuit Electronics hitting limit-up, Fushida up over 9%, and Jentech, Alchip-KY and Kaori up over 8%.
PCB and Testing/Packaging Groups Ignite Across the Board
PCB stocks rebounded higher. Unimicron posted Q3 2026 net profit after tax of 100.52億元, down 23.35% quarter-on-quarter but still the second-highest single quarter on record; cumulative net profit after tax for the first three quarters was 282.1億元, with EPS of 17.85, up nearly 8-fold year-on-year. Its share price surged to 1145 at one point and closed up over 3%, driving Chin-Poon, Kinsus, Taiding-KY, Fulltech, Atech Metals, Gold Circuit Electronics and Dah Hang Technology to limit-up, while Co-Tech rose over 9%, and Baodeli, Taiwan Union Technology, Daliang and Nan Ya rose over 7%. Test interface leader Chunghwa Precision Test Tech posted Q3 EPS of 16.75, earning over one share capital for three straight quarters to set a new high, and hit limit-up today. A U.S. foreign broker initiated WinWay at Overweight with a target price of 7500, and rated MPI Neutral with a target price of 5350, driving Chung Probe, Kinsus and Chunghwa Precision Test Tech to limit-up, while Fanquan rose over 8%, and VisEra, Chipbond and Powertech rose over 7%.
IC Design and Optics Strengthen, Focus on Earnings Calls
IC design focus was on MediaTek's Friday earnings call, with its AI ASIC layout earning Buy ratings from two U.S. foreign brokers with target prices of up to 5800 and 6800. ESMT, Tianqing, Global Unichip, Andes Technology, Faraday, Lianjie and Silergy-KY hit limit-up, Alchip-KY rose over 8%, and Aspeed, Etron, SiS and Nuvoton rose over 7%. Chung Yang Optical made progress in drone lenses, with drone revenue share expected to rise to 8% to 10% in the second half, sending its shares straight to the limit-up price of 57.9, while Genius Electronic Optical also hit limit-up, Kinko Optical and Young Optics rose over 6%, and Largan rose over 5%. UMC will hold its earnings call this afternoon, touched an intraday high of 128.5, and closed up over 4% at 128.