United Microelectronics Corporation (UMC) saw its stock surge 12.48% during pre-market trading on Wednesday, driven by a confluence of strong financial results and positive business developments.

The semiconductor foundry recently reported first-quarter net profit that surged 108% year-over-year, significantly exceeding market expectations. The company's gross margin reached 29.2% with capacity utilization climbing to 79%, while mature-node wafer pricing showed continued strength with average selling prices rising 8% in Q1 and guidance for a further 5-7% increase in the second quarter.

Further supporting the rally was the company's disclosed acquisition of approximately NT$1.03 billion worth of production equipment from Tokyo Electron, signaling ongoing capacity expansion. UMC also strengthened its technological position with the launch of a new 14nm eHV FinFET platform that delivers 40% power reduction and 35% chip area savings. The combination of robust earnings, confirmed pricing momentum, and strategic investments for future growth fueled significant investor optimism in the pre-market session.