Hsinchu, Taiwan, May 7, 2021 - United Microelectronics Corporation (NYSE: UMC; TWSE: 2303) ("UMC"), a leading global semiconductor foundry, today announced that it was ranked in the top 5% of companies for the seventh consecutive year in the Corporate Governance Evaluation conducted by the Taiwan Stock Exchange and Taipei Exchange. UMC had outstanding marks in areas including the protection of shareholders' rights and interests, strength of operation of the Board of Directors and Director functions, timely information disclosure, and executing corporate social responsibility measures. The final 45 TWSE listed and 36 TPEx listed companies were selected from a total of 1,617 companies that were reviewed. Since the implementation of the Corporate Governance Evaluation in 2015, only 10 listed companies including UMC have won this award for seven consecutive years.

UMC not only continues to consciously strengthen the diversification of directors, but also sets up four committees under the Board of Directors: "Audit Committee," "Remuneration Committee," "Capital Budget Committee" and "Nomination Committee" to strengthen operational supervision and transparency, and ensure the rights and interests of all shareholders.

UMC also continues to uphold the vision of "People-oriented, Environmental Symbiosis, and Social Prosperity." In the pursuit of profitable growth that also deepens the company's sustainable governance culture at the same time, the company has been recognized with a number of honors awards from domestic and foreign institutions:

• Listed on the “DJSI Dow Jones Sustainability Index World Index” for 13 consecutive years
• Continuously selected as constituent stocks on the FTSE4Good Emerging Market and Taiwan Perpetual Indexes
• Received the “Taiwan Business Sustainability Report Award” for 13 consecutive years and the highest platinum award for the third time
• Received the “Green Chemistry Innovation and Application Award” from the Environmental Protection Agency for 2 consecutive years
• Won the “Second National Enterprise Environmental Protection Award-Giant Award”

The company will continue to work with global supply chain partners and stakeholders to exert its influence and continue to advance on the road to sustainable business, providing the greatest contribution to the positive development of the overall environment, society and economy.

UMC (NYSE: UMC, TWSE: 2303) is a leading global semiconductor foundry. The company provides high quality IC production with a focus on both logic and specialty technologies to serve every major sector of the electronics industry. UMC’s comprehensive technology and manufacturing solutions include logic/RF, embedded high voltage, embedded flash, RFSOI/BCD and IATF-16949 automotive manufacturing certification for all its manufacturing facilities. UMC operates 12 fabs that are strategically located throughout Asia with a maximum capacity of more than 750,000 8-inch equivalent wafers per month. The company employs approximately 19,500 people worldwide, with offices in Taiwan, China, United States, Europe, Japan, Korea and Singapore. For more information, please visit: https://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.