United Microelectronics is trading at $20.22, up +6.03%, benefiting from renewed semiconductor-sector optimism after Nvidia forecast approximately 70% revenue growth for its next fiscal year.
- The catalyst appears sector-driven rather than company-specific; broader technology stocks rallied after Nvidia’s outlook.
- Major U.S. indices were only modestly higher on August 28, 2026.
- Trading is active during the open, with no confirmed new company-specific announcement identified.