TAIPEI, Taiwan, Jan. 8 — (PRNewswire) — United Microelectronics Corporation (NYSE: UMC; TAIEX: 2303), (UMC) today reported unaudited net sales for the month of December 2009.

    Revenues for December 2009

    Period          2009          2008      Y/Y Change     Y/Y (%)    M/M (%)
    December     9,292,732     4,609,683    +4,683,049    +101.59%    +1.49%
    Jan.-Dec.   88,617,572    92,530,051    -3,912,479      -4.23%       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:

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

SOURCE United Microelectronics Corporation

Contact:

United Microelectronics Corporation Phil Lee or Tien Yu Tseng, both of UMC, Investor Relations Phone: +886-2-2700-6999, ext. 6957 Email Contact Email Contact Web: http://www.umc.com