On June 23, United Microelectronics Corporation (UMC) fell 4.11% in pre-market trading, trading at $26.4/share, with turnover of $1.2477 million.

On the news front, UMC issued a statement on the Taiwan Stock Exchange regarding market rumors of a collaboration with Intel on 3nm chip development, stating that it does not comment on speculative reports or market rumors and reiterating that investors should rely solely on official disclosures. The non-confirmation dampened investor confidence regarding the partnership's certainty.

Additionally, the semiconductor sector came under broad selling pressure, with Micron Technology down 8.44%, Intel down 7.65%, Marvell Technology down 7.62%, and Advanced Micro Devices down 5.63%, reflecting sector-wide risk-off sentiment. UMC had previously surged over 15% on rumors of jointly developing 3nm and 12nm process technologies with Intel at its Arizona facility, combined with its embedded deep trench capacitor technology entering the Qualcomm supply chain. The sharp prior rally intensified profit-taking pressure in the current session.

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