UMC Reports Sales for February 2009

TAIPEI, R.O.C., March 9 /PRNewswire-Asia-FirstCall/ — United
Microelectronics Corporation (NYSE: UMC; TAIEX: 2303), (UMC) today reported
unaudited net sales for the month of February 2009.

    Revenues for February 2009

    Period            2009          2008    Y/Y Change      Y/Y(%)    M/M(%)
    February     3,143,826     7,288,918    -4,145,092    -56.87%    -0.29%
    Jan.-Feb.    6,296,820    15,504,472    -9,207,652    -59.39%       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 .

    For further information, please contact:

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

SOURCE United Microelectronics Corporation