Hsinchu, Taiwan, October 8, 2015 - United Microelectronics Corporation (NYSE: UMC; TWSE: 2303) ("UMC”), a leading global semiconductor foundry, today announced that it has been ranked second in the 2015 Channel NewsAsia Sustainability Top 100 Ranking, and top among all Taiwan companies. UMC represented all Taiwan companies at the 2015 CSR Asia Summit in Kuala Lumpur, Malaysia.

Po Wen Yen, CEO at UMC, said, "This achievement illustrates UMC's continued excellence in sustainable operations, as well as the comprehensive, transparent, substantial information disclosure in our annual reports, CSR reports, CSR website, and news releases. Furthermore, our environmental policy and efforts in the five-year "UMC Green 2020" plan for reduction in water, energy consumption and waste generation, industry-leading water risk management and 7.5% water consumption reduction in the last two years, have also been internationally recognized. Going forward, we promise to continue practicing green, environmentally friendly concepts concurrently with technology development and manufacturing to pursue sustainable growth."

The Channel NewsAsia Sustainability Ranking is conducted by Singapore Channel NewsAsia, and its partners CSR Asia and Sustainalytics. This year, the ranking covers Asian companies across 11 key regions including China, Hong Kong, India, Indonesia, Malaysia, the Philippines, Singapore, South Korea, Taiwan, Thailand, and Japan. The index lists the Top 100 companies with the highest sustainability performance in environmental, social and corporate governance, providing stakeholders such as investors and consumers a benchmark to evaluate companies’ performance in sustainability and information disclosure.

UMC (NYSE: UMC, TWSE: 2303) is a leading global semiconductor foundry that provides advanced IC production for applications spanning every major sector of the electronics industry. UMC’s robust foundry solutions enable chip designers to leverage the company's sophisticated technology and manufacturing, which include 28nm gate-last High-K/Metal Gate technology, ultra-low power platform processes specifically engineered for Internet of Things (IoT) applications and the highest-rated AEC-Q100 Grade-0 automotive industry manufacturing capabilities. UMC’s 10 wafer fabs are located throughout Asia and are able to produce over 500,000 wafers per month. The company employs over 17,000 people worldwide, with offices in Taiwan, mainland China, Europe, Japan, Korea, Singapore, and the United States. UMC can be found on the web at 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 future outsourcing, wafer capacity, technologies, 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, including its registration statements and reports on Forms F-1, F-3, F-6 and 20-F and 6-K, in each case as amended. 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.