On September 24, United Microelectronics fell 3.12% in pre-market trading, trading at $23.90/share, with turnover of $15,700. The stock has been under sustained selling pressure in recent sessions, with the latest decline attributed to concentrated insider disposals and a broadly weaker semiconductor sector.

On the news front, United Microelectronics recently disclosed multiple insider transactions. Executive LIN JEN-TSUNG sold 10,000 shares on September 22, while executive Liu Chitung sold a combined 1.6 million shares between September 16 and 17. Earlier in July, Liu Chitung had also sold 1.9 million shares. The frequency and scale of executive selling have weighed on market sentiment. Meanwhile, the semiconductor sector continued to slide broadly, with Intel down 1.70%, Advanced Micro Devices down 1.32%, Micron Technology down 1.31%, Broadcom down 1.06%, and NVIDIA down 0.71%, collectively dragging on the stock.

Notably, United Microelectronics had previously rallied on expectations of mature-process wafer price hikes and strong August revenue of NT$25.045 billion, up 30.71% year-over-year. However, the positive fundamental backdrop has been overshadowed by persistent insider selling and sector-wide headwinds in recent sessions.

(The above content is based on publicly available market information, generated by a program or algorithm, and is intended solely as a stock movement alert. It does not constitute investment advice or a basis for trading decisions.)