On September 23, United Microelectronics fell 3.03% in regular trading, trading at $24.975/share, with turnover of $25.84 million. The pullback follows a cumulative gain of over 6% across the prior two trading sessions, driven by mature-node wafer pricing optimism.

On the news front, multiple headwinds converged to weigh on the stock. United Microelectronics disclosed insider transactions on September 22, showing executive LIN JEN-TSUNG sold 10,000 shares that day. Additionally, executive Liu Chitung sold a combined 1.6 million shares between September 16 and 17, with total proceeds exceeding $229 million. The concentrated insider selling raised market concerns.

Meanwhile, the broader semiconductor sector came under pressure, with Intel declining 2.34%, Advanced Micro Devices falling 1.03%, Micron Technology dropping 0.96%, and NVIDIA slipping 0.37%, creating a negative backdrop. The prior rally had been fueled by expectations of mature-node wafer price hikes, with the company signaling that pricing adjustments next year would be more pronounced than the second half of this year, and capacity utilization exceeding 90%.

(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.)