UMC Reports Sales for April 2005

    Business Editors

    TAIPEI, China--(BUSINESS WIRE)--May 9, 2005--United Microelectronics Corporation
    (NYSE: UMC; TAIEX: 2303), (UMC) today reported unaudited net sales for the month of April 2005.

Revenues for April 2005

Period 2005 2004 Y/Y Change Y/Y (%) M/M (%) ---------------------------------------------------------------------- April 6,366,921 9,208,568 -2,841,647 -30.86% -9.15% ---------------------------------------------------------------------- Jan.-Apr. 26,652,641 34,534,095 -7,881,454 -22.82% N/A ----------------------------------------------------------------------

(+) All figures in thousands of New Taiwan Dollars (NT$), except for percentages.
    Additional information about UMC is available on the web at http://www.umc.com.

--30--CD/ny*

CONTACT: UMC Chitung Liu, + 886-2-2700-6999 ext. 6957 chitung_liu@umc.com or Bowen Huang, + 886-2-2700-6999 ext. 6957 bowen_huang@umc.com or Christensen IR Tip Fleming, +1-917-412-3333 tfleming@christensenir.com or Jane Li, +852-2117-0861 jliu@christensenir.com

KEYWORD: CHINA INTERNATIONAL ASIA PACIFIC INDUSTRY KEYWORD: HARDWARE TELECOMMUNICATIONS NETWORKING EARNINGS SOURCE: United Microelectronics Corporation

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