On September 17, United Microelectronics rose 3.51% overnight, trading at $23.32 per share with turnover of $975,300, extending the prior session's 3.68% intraday gain.

On the news front, TSMC's CoWoS advanced packaging capacity continues to face severe supply shortages, with the production bottleneck now spilling over to foundry and packaging peers including United Microelectronics, Amkor, and ASE. The market expects United Microelectronics to capture incremental demand from this substitution effect. Meanwhile, the company reported August consolidated net sales of NT$25.045 billion, surging 30.71% year-over-year, while cumulative revenue for the first eight months climbed 14.66% year-over-year to NT$178.659 billion. TrendForce data also showed United Microelectronics posted a 12.7% quarter-over-quarter revenue increase in Q2, maintaining a 3.9% market share in the global foundry space.

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