On July 13, United Microelectronics declined 3.7% overnight, trading at $23.44/share, with turnover of $1.0148 million.

The decline was driven by broad-based selling pressure across the semiconductor sector. Peers Micron Technology fell 5.34%, Intel dropped 3.32%, Broadcom declined 2.4%, and NVIDIA slid 1.63%, reflecting systematic risk aversion in the chip space. UMC had earlier risen 4.2% in pre-market trading following news that ASML researchers achieved a breakthrough in EUV light source technology capable of boosting chipmaking output by 50%, but the sector-wide downturn forced a full reversal of those gains.

On fundamentals, UMC reported Q2 revenue growth of nearly 17% year-over-year, marking a 15-quarter high, with June revenue surging 23% annually. While underlying business momentum remains intact, near-term sector sentiment continues to suppress individual stock performance.

(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.)