United Microelectronics Corporation (UMC) Stock Sinks As Market Gains: What You Should Know Posted byZacks Equity Research December 23, 2021 Leave a comment on United Microelectronics Corporation (UMC) Stock Sinks As Market Gains: What You Should Know United Microelectronics Corporation (UMC) closed the most recent trading day at $11.58, moving -0.43% from the previous trading session.