UMC Files Form 20-F for 2008 with US Securities and Exchange Commission

Taipei, R.O.C. - May 8, 2009 - United Microelectronics Corporation (NYSE: UMC; TAIEX: 2303), (UMC) today filed its 2008 annual report on Form 20-F with the US Securities and Exchange Commission. The report is available at http://www.umc.com/english/investors/h.asp

Shareholders may request a hard copy of the Form 20-F free of charge. Please contact UMC-IR at ir@umc.com.