🟢 United Microelectronics is trading 4.12% up in pre-market; no clear catalyst identified

United Microelectronics is trading at $20.70 (+4.12%) in pre-market, with no credible September 1, 2026 company-specific announcement or direct catalyst identified.

• The stock rose from the August 31 close of $19.88.
• July 29 company news highlighted stronger second-quarter results, higher capital spending, and Singapore and Taiwan expansion for AI demand, but did not clearly explain the move.
• Reuters did not report a September 1 price catalyst.