UMC Again Ranks Top 1% in the Semiconductor Industry in S&P Global Sustainability Yearbook 2026

HSINCHU, Taiwan, February 23, 2026 - United Microelectronics Corporation (NYSE: UMC; TWSE: 2303)("UMC"), a leading global semiconductor foundry, today announced that it has once again been ranked in the top 1% of the global semiconductor industry in the recently released Sustainability Yearbook 2026 published by S&P Global. In addition, UMC has earned the highest score in the S&P Global Corporate Sustainability Assessment (CSA) for the second consecutive year, ranking first globally in its industry category. These recognitions highlight UMC's long-term commitment and tangible achievements across environmental, social, and governance (ESG) dimensions, further reinforcing its role as a key benchmark for sustainable development in the semiconductor industry.

S&P Global publishes its Sustainability Yearbook annually based on the results of its CSA score, recognizing companies that demonstrate a strong competitive edge in sustainability within their respective industries. In the 2026 Yearbook, S&P Global selected 848 companies from 9,200 large corporations across 59 industries worldwide as Yearbook members, with UMC ranked in the top 1% globally within the Semiconductor and Semiconductor Equipment industry.

SC Chien, UMC's Co-President and Chief Sustainability Officer, said: "Over the years, UMC has remained steadfast in promoting sustainable value, embedding sustainability deeply into our operations as a key cornerstone of the company's long-term development. Being recognized once again by S&P Global not only affirms the team's long-term efforts, but also inspires us to continue moving forward with steady, deliberate progress. Looking ahead, UMC will further strengthen its sustainability initiatives, driving technological innovation while actively contributing to positive developments in the global climate, society, and economy."

UMC continues to advance its ESG efforts across three key dimensions. On environmental sustainability, UMC has been actively driving decarbonization initiatives. As of 2024, the company has achieved a 31% reduction in Scope 1 and Scope 2 emissions, and a 23.7% reduction in Scope 3 emissions. In 2025, UMC's 1.5°C net-zero targets were validated by the Science Based Targets initiative (SBTi), making it the first semiconductor foundry worldwide to receive approval for the targets. That year, the company also established the Circular Economy & Recycling Innovation Center and obtained UL 2799 Zero Waste to Landfill (ZWTL) certification. Through systematic management and resource recovery mechanisms, UMC continues to enhance its waste recycling rate, steadily progressing toward its zero-waste and circular economy goals.

From a social perspective, UMC is systematically promoting diversified talent development programs and actively advancing digital transformation training. By introducing digital tools, the company helps employees enhance both work efficiency and professional capabilities. At the same time, UMC offers maternity and paternity leave benefits that exceed legal requirements, flexible working hours, and childcare subsidies. The company has also partnered with the Southern Science Park Administration to establish a non-profit preschool, enabling employees to better balance work and family life, and fostering a warm and inclusive workplace environment.

In terms of corporate governance, UMC continues to strengthen the functioning of its Board and related governance mechanisms. The company has reduced the maximum number of external directorships or supervisory positions that each non-executive director may hold to four. This measure is intended to ensure directors can dedicate adequate time and expertise to their responsibilities, while also strengthening the Board's independence and oversight. In addition, the company has further enhanced remuneration disclosure for the Chairman, Presidents, and directors by adopting individualized disclosure, strengthening compensation transparency, stakeholder communication, and alignment with international corporate governance best practices.

UMC's long-term commitment to ESG has been widely recognized in various international evaluations. The company has been rated AA in the MSCI ESG Ratings, included as a constituent of the FTSE4Good TIP Taiwan ESG Index, and obtained the highest Prime status in the ISS ESG Corporate Rating. Looking ahead, UMC will continue to leverage its influence within the industry to create maximum value for all stakeholders, working together to move toward a better and more sustainable future.

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.