On July 15, United Microelectronics rose 6.17% overnight, trading at $25.31/share, with turnover of $26,000.

On the news front, UMC announced that its Singapore fab has completed the first batch of silicon photonics wafer mass production. The company partnered with Singapore-based fabless chip design firm Silith Technology, taking only 18 months to advance its silicon photonic chip platform from R&D to volume production. The technology targets high-speed interconnect needs for next-generation AI infrastructure. UMC is shifting production to 12-inch wafers to improve performance and power efficiency, with IMEC helping develop a broader manufacturing platform targeted for launch in 2027.

Additionally, Citi expressed a bullish outlook on UMC's second-half prospects, forecasting Q2 sales to grow 13% sequentially with margin recovery. On the fundamentals side, UMC's Q2 revenue grew nearly 17% YoY, hitting a 15-quarter high, and June revenue surged 23% YoY. The next earnings report is scheduled for July 29.

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