UNITED MICROELECTRONICS CORP

Our legal and commercial name is United Microelectronics Corporation, commonly known as UMC. We were incorporated under the R.O.C. Company Law as a company limited by shares in May 1980 and our common shares are listed on the Taiwan Stock Exchange since 1985. Our principal executive office is located at No. 3 Li-Hsin 2 nd Road, Hsinchu Science Park, Hsinchu, Taiwan, R.O.C, and our telephone number is 886-3-578-2258. Our Internet website address is www.umc.com . The information on our website does not form part of this Annual Report. Our ADSs have been listed on the NYSE under the symbol UMC since September 19, 2000. In 2025, we were ranked among the top 5% of companies for the eleventh consecutive year in the Corporate Governance Evaluation conducted by the Taiwan Stock Exchange and Taipei Exchange. The assessment was conducted across over 1,700 public companies in Taiwan. We are one of the world’s largest independent semiconductor foundries and a leader in semiconductor manufacturing process technologies. Our primary business is the manufacture, or fabrication , of semiconductors, sometimes called chips or integrated circuits , for others. Using our own proprietary processes and techniques, we make chips to the design specifications of our many customers. Our company maintains a diversified customer base across industries, including communication devices, consumer electronics, computer and others, while continuing to focus on manufacturing for high growth, large volume applications, including networking, telecommunications, internet, multimedia, PCs and graphics.