On July 16, United Microelectronics declined 7.44% in regular trading, trading at $22.82/share, with turnover of $44.20 million. The stock fully retraced its previous session's 7%+ rally as broad semiconductor sector selling pressure intensified.

The semiconductor sector experienced a sweeping global selloff, with sector peers Micron Technology down 2.79%, Intel down 2.65%, AMD down 2.39%, TSMC down 1.73%, and NVIDIA down 1.43%. The Asian semiconductor rout was particularly severe, with South Korea's Kospi index plunging over 7% and triggering circuit breakers, as investors questioned the sustainability of AI-related capital expenditure translating into sustained earnings growth across the semiconductor supply chain.

UMC had surged over 7% in the prior session on news that its Singapore fab delivered its first mass-produced silicon photonics wafers in partnership with Silith Technology, combined with Citi's bullish outlook for the second half. However, systematic industry-wide selling pressure overwhelmed stock-specific catalysts. On fundamentals, UMC's Q2 revenue grew approximately 17% year-over-year to a 15-quarter high, with the next earnings report scheduled for July 29.

(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.)