Hsinchu, Taiwan, September 14, 2012 - United Microelectronics Corporation (NYSE: UMC; TWSE: 2303) ("UMC" or "The Company"), a leading global semiconductor foundry, today announced that Dow Jones Sustainability Index (DJSI) has selected UMC as a global component for the fifth consecutive year. This year, UMC was listed for both the DJSI-World and DJSI-Asia Pacific indexes. DJSI-World 2012 evaluated about 2,500 global enterprises, with only 340 qualifying as global components. Only 5 semiconductor companies were selected worldwide, with 4 listed for DJSI-Asia Pacific. UMC also achieved the highest scores for Innovation Management, Environmental Policy/Management System, Product Stewardship, Corporate Citizenship and Philanthropy and Stakeholder Engagement. UMC's listing underscores the company's exceptional performance in continued innovation, sustainable operations and CSR which is on par with leading global companies and recognized by international investors.

Dr. Shih-Wei Sun, CEO from UMC, said, "UMC's selection as a DJSI global component for five consecutive years demonstrates our hard work in sustainable operations, environmental protection, and corporate social responsibility. In addition to excelling in our core foundry business, we also strive to lead global businesses to fulfill corporate responsibilities while realizing our own CSR vision to co-exist with society. Our newly-built facility at Fab 12A has gained LEED Gold recognition from the U.S. Green Building Council and EEWH Gold certification from Taiwan. We have also recently received the CSR award from CommonWealth magazine. Going forward, we will continue to aggressively fulfill our responsibility as a corporate citizen, and cooperate with suppliers to help our customers produce green products so that we may improve sustainable competitiveness together. "

Dow Jones Sustainability Indexes was launched jointly by Dow Jones Index, STOXX and Sustainable Asset Management (SAM) in 1999. DJSI is the first index that traces social responsibility performance of leading-edge enterprises, and is also one of the most creditable evaluation tools for reviewing sustainability worldwide. "DJSI-World" picks approximately 2,500 global enterprises for the evaluation and the top 10% of these enterprises will be listed as its components. "DJSI-Asia Pacific" picks top 600 enterprises in Asia Pacific for the evaluation, and the top 20% whose market coverage are in top 45% in this region will be listed as its components.

UMC (NYSE: UMC, TWSE: 2303) is a leading global semiconductor foundry that provides advanced technology and manufacturing for applications spanning every major sector of the IC industry. UMC's customer-driven foundry solutions allow chip designers to leverage the company's leading-edge processes, which include 28nm poly-SiON and gate-last High-K/Metal Gate technology, mixed signal/RFCMOS, and a wide range of specialty technologies. Production is supported through 10 wafer manufacturing facilities that include two advanced 300mm fabs; Fab 12A in Taiwan and Singapore-based Fab 12i. Fab 12A consists of Phases 1-4 which are in production for customer products down to 28nm. Construction is underway for Phases 5&6, with future plans for Phases 7&8. The company employs over 13,000 people worldwide and has offices in Taiwan, Japan, Singapore, Europe, and the United States. UMC can be found on the web at http://www.umc.com.