On July 7, United Microelectronics fell 6% in regular trading, trading at $24.09/share, with turnover of $89.30 million. The decline comes as broad semiconductor sector weakness triggered a reversal of gains accumulated in the prior session.

On the news front, UMC had previously reported June consolidated revenue of NT$23.12 billion, up 22.85% year-over-year, with first-half cumulative revenue rising 11.28% to NT$129.77 billion — representing solid fundamental performance. However, this positive data had already been fully priced in during the July 6 session, when shares rallied as much as 4.65% to $25.94. Systematic selling pressure across the semiconductor sector on July 7, with Intel down 7.59%, Advanced Micro Devices down 7.02%, Micron Technology down 5.64%, Broadcom down 1.9%, and NVIDIA down 1.6%, dragged UMC lower and erased the previous day's gains.

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