United Microelectronics Corporation (UMC) saw its stock price decline by 5.05% during after-hours trading. The semiconductor foundry's shares came under significant selling pressure ahead of its upcoming quarterly earnings report.

Market expectations point to subdued financial performance, with consensus estimates projecting quarterly revenue growth of only 3.18% year-over-year and a substantial 20% year-over-year decline in adjusted earnings per share. Additionally, the company's first-quarter capacity utilization guidance has fallen below the industry average, raising concerns about near-term profitability.

Earlier market optimism about UMC potentially entering the 2D NAND foundry business has been tempered by supply chain analysis highlighting significant challenges. Industry sources identified three major hurdles facing the company: difficulties in talent acquisition, limitations in technology and process integration capabilities, and equipment readiness issues. The weakness appears to be company-specific as other major semiconductor stocks showed gains during the same trading session.