As of December 2025 United Microelectronics has a market cap of $20.22 Billion USD. This makes United Microelectronics the world's 1100th most valuable company by market cap according to our data. The market capitalization, commonly called market cap, is the total market value of a publicly traded company's outstanding shares and is commonly used to measure how much a company is worth.
On Dec 8th, 2025 the market cap of United Microelectronics was reported to be: