United Microelectronics (UMC) experienced a significant surge of 6.97% during the night session, reflecting strong investor confidence in the semiconductor company's performance and outlook.

The rally was primarily driven by the company's robust first-quarter financial results, which showed a net profit of NT$16.17 billion, representing a 108% year-over-year increase that significantly exceeded market expectations. Additionally, management confirmed positive wafer pricing trends, with an 8% year-over-year rise in average selling price in Q1 and guidance for a further 5%-7% increase in the second quarter, supported by resilient demand and a tightening capacity environment. The recent launch of UMC's new 14nm eHV FinFET platform for next-generation OLED display driver ICs, which offers substantial power and area savings, further bolstered its competitive positioning in specialty technologies.