On July 15, United Microelectronics rose 7.47% in regular trading, trading at $25.65/share, with turnover of $21.03 million.

On the news front, United Microelectronics announced that its Singapore fab has successfully completed mass production of its first batch of silicon photonics wafers. The company collaborated with Singapore-based fabless chip design firm Silith Technology, taking just 18 months to advance its silicon photonics chip platform from R&D to volume production readiness. The technology targets high-speed interconnect demands for next-generation AI infrastructure. The company is transitioning its production lines to 12-inch wafers to enhance performance and power efficiency, with plans to formally offer its proprietary 12-inch silicon photonics platform in 2027.

Additionally, Citigroup expressed a bullish outlook on United Microelectronics' second-half prospects, forecasting Q2 sales to grow 13% quarter-over-quarter. On the fundamentals side, Q2 revenue grew nearly 17% year-over-year, reaching a 15-quarter high. The next earnings report is scheduled for July 29.

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