On July 15, United Microelectronics rose 5.68% in pre-market trading, trading at $25.2/share, with turnover of $284,900. The rally was driven by the company's announcement that its Singapore facility has completed the first batch of silicon photonics wafer mass production, alongside a bullish second-half outlook from Citi.

United Microelectronics stated it partnered with Singapore-based fabless chip design firm Silith Technology to advance its silicon photonics chip platform from R&D to volume production in just 18 months. The technology targets high-speed interconnect needs for next-generation AI infrastructure. The company is transitioning production lines to 12-inch wafers to enhance performance and power efficiency. Additionally, IMEC is helping develop a broader manufacturing platform targeted for launch next year.

Citi expressed optimism on United Microelectronics' second-half prospects, projecting Q2 sales growth of 13% quarter-over-quarter. On the fundamental side, Q2 revenue grew nearly 17% year-over-year, marking a 15-quarter high. June revenue alone surged 23% annually to NT$23.1 billion. The next earnings report is scheduled for July 29.

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