· Weekly signal · UMC

United Microelectronics (UMC) breaks lower as four-week slide reaches -22.6%

The semiconductor foundry’s pullback is cutting into a still-positive 12-week advance, leaving the weekly setup mixed rather than one-way weak.

United Microelectronics weekly market chart with semiconductor wafer manufacturing imagery.

United Microelectronics (UMC) closed the latest week at 19.48 USD, down -8.3% for the week and -22.6% over four weeks. The weekly price path over 52 weeks still shows a 49.3% twelve-week gain, so the recent decline is a sharp reset within a broader rebound.

Confirmation is mixed. The trend screen remains active and Relative Strength is 61.8, while Market Dynamics shows moderate confirmation at 0.65. Volume was lighter than the 13-week average, with 65.7 million shares traded versus an 83.6 million average, limiting evidence of heavy distribution.