Taiwanese proprietary traders net sold NT$17.911 billion in self-dealing shares this week, with UMC and Powerchip Semiconductor Manufacturing Corporation (PSMC) being heavily sold. UMC's stock price declined by 8.5%, resulting in a NT$2.51 billion loss for the week.
Proprietary traders are reducing exposure to key Taiwanese wafer foundries, reflecting short-term market sentiment on semiconductor manufacturing capacity.