HSINCHU, Taiwan, September 8, 2011 - 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 fourth consecutive year. This year, UMC was listed for both the DJSI-World and DJSI-Asia Pacific indexes. DJSI-World 2011 evaluated about 2,500 global enterprises, with only 342 qualifying as global components. Only five semiconductor companies were selected worldwide, with four listed for DJSI-Asia Pacific. UMC also achieved the highest scores for innovation management, environmental policy/management system, product stewardship, Water related risks and Standards for Suppliers. UMC's listing underscores the company's exceptional performance in continued innovation and sustainable operations, which is on par with leading global companies and recognized by international investors.

Dr. Shih-Wei Sun, CEO from UMC, said, "UMC's renewed selection as a DJSI global component demonstrates the hard work of our employees. Since we established UMC's CSR committee in 2008, UMC has been actively promoting sustainability within the environment, economy and society. Our activities include announcing "UMC Climate Change Policy," the only such policy among Taiwan companies, completing the industry's first carbon and water footprint product verification, electing more than half of the Board seats to independent and individual directors to increase corporate governance transparency, establishing a Remuneration Committee, assisting education for minority children, etc. These efforts have all contributed to UMC's DJSI listing. 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 services for applications spanning every major sector of the IC industry. UMC's customer-driven foundry solutions allow chip designers to leverage the strength of the company's leading-edge processes, which include production proven 65nm, 45/40nm, 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 are both in volume production for a variety of customer products. 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.