On July 28, United Microelectronics fell 14% in pre-market trading. The decline came amid a sweeping global semiconductor sell-off as investors grew increasingly concerned about whether AI demand has been artificially inflated.

On the news front, global chip stocks suffered a massive rout, with South Korea's Kospi index plunging as much as 9.6% and triggering a 20-minute trading halt. Memory chip giants Samsung Electronics and SK Hynix both dropped over 11%. NVIDIA's new round of transactions exceeding $750 billion further fueled market fears of an AI bubble, with systematic selling pressure spreading across the entire semiconductor supply chain.

United Microelectronics had already accumulated a decline of over 18% in recent sessions. After rebounding 6.01% on July 27 following Intel's better-than-expected earnings, the stock came under renewed pressure. Within the Semiconductors sector, Micron Technology fell 4.92%, SK hynix fell 4.76%, Intel fell 4.11%, Advanced Micro Devices fell 4.1%, and NVIDIA fell 1.35%. United Microelectronics is scheduled to report quarterly earnings on July 29, with consensus expecting revenue growth of 9.28% year-over-year.

(The above content is based on publicly available market information, generated by a program or algorithm, and is intended solely as a stock movement alert. It does not constitute investment advice or a basis for trading decisions.)