Tainan, Taiwan, April 30, 2012 - United Microelectronics Corporation (NYSE: UMC; TSE: 2303) ("UMC"), a leading global semiconductor foundry, today announced that it has received the "Best Supplier Award" from Xilinx for 2011 for achieving the highest overall performance score for technology, quality, delivery, responsiveness, and cost. Xilinx presents this award annually to one selected supplier for their contributions to the company's success, among fab, assembly/test, and substrate partners.

Po-Wen Yen, Senior Vice president of 12-inch Operations at UMC said, "We are excited to receive this award in recognition of UMC's efforts to deliver maximum customer value through world-class technology, manufacturing, and service. This award highlights the strength of the partnership between UMC and Xilinx that spans over 15 years across multiple technology generations. We continue to collaborate with Xilinx engineering teams for enabling technologies and look forward to further enhancing our service to them in the future."

"We're delighted to recognize UMC for providing Xilinx with best-in-class support throughout 2011," said Raja Petrakian, Xilinx Senior Vice President of Worldwide Operations. "We value our longtime relationship with UMC as a preferred supplier and key contributor to our success in delivering breakthrough products for more than ten product generations."

UMC (NYSE: UMC, TSE: 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 28nm, 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.