UMC Files Form 20-F for 2006 with US Securities and Exchange Commission

Taipei, R.O.C. -May 9, 2007-United Microelectronics Corporation
(NYSE: UMC; TAIEX: 2303), (UMC) today filed its 2006 annual report on Form 20-F with the US Securities and Exchange Commission. The report is available at http://www.umc.com/english/investors/c.asp

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

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