TAIPEI, Taiwan, June 9 /PRNewswire-Asia-FirstCall/ -- United Microelectronics Corporation (NYSE: UMC), (UMC) today reported unaudited net sales for the month of May 2009.

    Revenues for May 2009

    Period          2009          2008     Y/Y Change     Y/Y (%)    M/M (%)
    May         7,514,440     8,606,625    -1,092,185    -12.69%     +9.26%
    Jan.-May   25,229,948    41,130,795   -15,900,847    -38.66%        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 .

    Contacts:

     Bowen Huang / Tien Yu Tseng
     UMC, Investor Relations
     Tel.   +886-2-2700-6999, ext. 6957
     Email: bowen_huang@umc.com
            tien_yu_tseng@umc.com

Web site: http://www.umc.com/