On September 2, United Microelectronics fell 3.57% in pre-market trading, trading at approximately $19.93 per share, with turnover of $90,800.

The decline was driven by ongoing concerns over potential equity dilution following the company's board approval to issue up to $1.8 billion in unsecured overseas convertible bonds. The bonds, to be issued in two tranches with a tentative tenor of up to five years, carry a 0% coupon rate, meaning investor returns depend entirely on share conversion — amplifying dilution fears and prompting a reversal of gains seen in the prior session. On September 1, the stock had surged over 5% on the initial announcement as the market focused on the capital's intended use for equipment procurement and factory construction, extending UMC's approximately $5 billion capital expenditure plan targeting Singapore and Tainan facility expansions to capture AI and edge computing demand.

The broader semiconductor sector also weighed on sentiment, with Intel down 0.86%, Micron Technology down 0.71%, and Advanced Micro Devices down 0.55%. On the fundamental side, United Microelectronics reported Q2 EPS of $0.54, far exceeding the consensus estimate of $0.15, while July revenue rose 19% year-over-year to NT$23.84 billion, reflecting sustained improvement in mature-node demand.

(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.)