UMC Announces Key Changes in Executive Leadership

• Co-President Jason Wang named CEO of UMC
• Executive Vice President Ming Hsu appointed President and COO, as well as member of the Board
• SC Chien elected to serve as Chairman of Unimicron Technology, an invested company of the UMC group

HSINCHU, Taiwan, February 25, 2026 — United Microelectronics Corporation (NYSE: UMC; TWSE: 2303)(“UMC”), a leading global semiconductor foundry, today announced the UMC Board of Directors has approved executive changes to its leadership team, cementing the company’s succession plans while ensuring UMC’s competitiveness. Jason Wang, UMC’s Co-President, will become Chief Executive Officer. Executive Vice President Ming Hsu is named President and Chief Operating Officer of UMC, and has also been appointed a member of the Board. Co-President SC Chien has been elected to serve as Chairman of Unimicron Technology, an invested company of the UMC group.

UMC appointed Chien and Wang as Co-Presidents in 2017, who together led the company’s strategic transformation to focus on specialty process technologies serving high-growth markets. Under their leadership, UMC’s profitability improved significantly as the company won customers as a trusted foundry partner, while the company’s market capitalization has grown roughly fivefold over their tenure.

Stan Hung, Chairman of UMC, said: “Enhancing our organizational structure to keep pace with the rapidly evolving industry landscape and to position UMC to seize market opportunities has always been a core priority. The leadership changes announced today will enable UMC to further strengthen execution and raise decision-making efficiency, while ensuring continuity of our strategic direction.”

Chairman Hung added: “I would like to express my deepest gratitude to President Chien for his leadership over the years, helping UMC navigate through some of our biggest opportunities and challenges.”

New President and Chief Operating Officer, Ming Hsu, joined UMC USA in 2003 and has been a core member of the company’s senior leadership, overseeing corporate operation planning across UMC’s globally diversified sites, as well as corporate marketing, customer engineering, and business strategy.