United Microelectronics Corporation (UMC) stock surged 6.22% during pre-market trading on Tuesday, marking a significant positive move for the semiconductor foundry.

The rally was driven by a strong market reaction to the company's recently released first-quarter financial results, which significantly exceeded analyst expectations. UMC reported a net profit of NT$16.17 billion for Q1, representing a 108% year-over-year increase. The company's gross margin reached 29.2%, supported by capacity utilization climbing to 79%.

Notably, management indicated that average selling prices rose 8% year-over-year in the first quarter and guided for an additional 5-7% price increase in the second quarter. This clear pricing power in mature process nodes and strong operational performance has fueled continued investor optimism, extending the stock's gains into the pre-market session.