UMC stock jumps near 10% after December sales update as January earnings near
UMC shares jumped nearly 10% to a 52-week high of $9.11 after reporting December sales up 1.66% year-on-year and full-year 2025 sales up 2.26%. The stock was among the top semiconductor gainers in Wednesday’s session. Investors await UMC’s next earnings report, expected January 28, for updates on 2026 demand.