On June 23, United Microelectronics (UMC) declined 3.27% overnight, trading at $26.87/share, with turnover of $2.2897 million.

On the news front, UMC issued a statement on the Taiwan Stock Exchange regarding the widely circulated Intel collaboration rumors, stating it does not comment on speculative reports or market rumors and reaffirming that investors should rely solely on official disclosures. The market interpreted this non-confirmation as casting doubt on the certainty of the reported partnership.

The pullback follows a sharp rally of over 10% in the prior session, driven by reports that Intel and UMC would jointly develop 3nm and 12nm process technologies at Intel's Arizona facility. With the company declining to verify the collaboration, profit-taking pressure emerged after the rapid run-up. Additionally, the broader semiconductor sector faced selling pressure, with Intel down 3.15%, Micron Technology down 3.15%, Marvell Technology down 4.0%, Advanced Micro Devices down 1.64%, and NVIDIA down 0.89%.

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