United Microelectronics' stock soared 8.86% intraday on Tuesday, extending its recent gains.

The continued upside is driven by the company's better-than-expected first-quarter results. UMC reported revenue of approximately $1.93 billion, exceeding consensus estimates by $10 million, with net profit surging 108% year-over-year. Gross margin improved to 29.2%.

A key highlight was the 22nm process node, which reached a record 14% of total Q1 revenue, driven by strong demand for logic chips and specialty processes. Management projects high double-digit percentage growth for 22nm in the second half and plans to raise wafer prices, citing resilient demand across communications, consumer, and AI-related applications. The broader semiconductor sector's strength also contributed to the positive sentiment.