HSINCHU, TAIWAN — August 17, 2026 — United Microelectronics Corporation (NYSE: UMC; TWSE: 2303) (“UMC”), a leading global semiconductor foundry, today announced that it has been named one of Asia’s top employers of choice in the HR Asia Best Companies to Work for in Asia Awards 2026, marking the third time UMC has received this recognition. From employee welfare to talent development, UMC is committed to building a people-centric workplace where employees can thrive.

Organized by HR Asia, a leading human resources publication in Asia, the HR Asia Best Companies to Work for in Asia Awards cover 15 markets and hundreds of companies. The evaluation is based on employee engagement surveys and corporate reports, assessing organizational culture, employee experience, and teamwork to determine excellence in human capital management.

Jason Wang, CEO of UMC, said, “Our people are our most valuable asset. UMC is committed to fostering a diverse, equitable and inclusive culture and providing a safe, healthy, respectful and inclusive workplace where every employee can realize their potential and grow together. We also continue to invest in talent development and career growth, encouraging our employees to innovate and embrace continuous learning as we build a competitive and sustainable workforce for the future.”

UMC supports employees through different stages of life with a comprehensive benefits program spanning career development, family and childcare, physical and mental well-being, caregiving support, and retirement planning. This includes an annual childcare subsidy for employee’s children under the age of six in Taiwan and a comprehensive 360-degree healthcare system that covers preventive care such as annual health checkups and cardiopulmonary CT screenings, influenza and shingles vaccinations, and disability support.

UMC continues to invest in its people, equipping employees with diverse opportunities for learning, career growth, and skills development through its talent development framework, digital transformation initiatives, and leadership development program. To help new employees build job-ready skills, the company established the UMC Equipment Academy in 2022, offering structured courses and hands-on training. In response to the accelerating pace of digital transformation, UMC has also launched a seed program in which designated employees serve as trainers to support other team members in building practical digital skills and confidence in applying AI tools in their everyday work.

Community engagement is a key pillar of UMC’s sustainability strategy. UMC supports structured employee volunteering through employee clubs and community initiatives led by individual fabs and departments. By providing 16 hours of paid volunteer leave each year, employees are empowered to contribute their time and skills to create meaningful, lasting social impact. In 2025, UMC employees contributed a total of 9,689 volunteer hours, benefiting over 66,000 people in our communities.

About UMC

UMC (NYSE: UMC, TWSE: 2303) is a leading global semiconductor foundry company. The company provides high-quality IC fabrication services, focusing on logic and various specialty technologies to serve all major sectors of the electronics industry. UMC’s comprehensive IC processing technologies and manufacturing solutions include Logic/Mixed-Signal, embedded High-Voltage, embedded Non-Volatile-Memory, RFSOI, BCD etc. Most of UMC's 12-in and 8-in fabs with its core R&D are located in Taiwan, with additional ones throughout Asia. UMC has a total of 12 fabs in production with combined capacity of more than 400,000 wafers per month (12-in equivalent), and all of them are certified with IATF 16949 automotive quality standard. UMC is headquartered in Hsinchu, Taiwan, plus local offices in United States, Europe, China, Japan, Korea & Singapore, with a worldwide total of 20,000 employees. For more information, please visit: http://www.umc.com.

Note from UMC Concerning Forward-Looking Statements

Some of the statements in the foregoing announcement are forward-looking within the meaning of the U.S. Federal Securities laws, including statements about introduction of new services and technologies, future outsourcing, competition, wafer capacity, business relationships and market conditions. Investors are cautioned that actual events and results could differ materially from these statements as a result of a variety of factors, including conditions in the overall semiconductor market and economy; acceptance and demand for products from UMC; and technological and development risks. Further information regarding these and other risks is included in UMC’s filings with the U.S. Securities and Exchange Commission. UMC does not undertake any obligation to update any forward-looking statement as a result of new information, future events or otherwise, except as required under applicable law.