United Microelectronics Corporation (UMC) had a good day Wednesday, with shares climbing after the Taiwanese chipmaker posted solid sales growth for both December and the full year.

The Numbers

United Microelectronics reported unaudited net sales of NT$19.28 billion for December 2025, compared to NT$18.97 billion in December 2024. That's a 1.66% year-over-year bump.

The bigger picture looks even better. For all of 2025, UMC posted net sales of NT$237.55 billion versus NT$232.30 billion the year before. That translates to full-year sales growth of 2.26%.

All figures are in thousands of New Taiwan dollars and remain unaudited.

Why It Matters

The semiconductor industry stays competitive, and steady growth matters. UMC's consistent sales increases suggest the company is holding its ground in the foundry business, where manufacturers produce chips designed by other companies.

Investors clearly liked what they saw. At the time of the announcement, United Microelectronics shares were trading 8.74% higher at $8.82, reflecting confidence in the company's trajectory as it heads into the new year.