United Microelectronics Corporation (NYSE: UMC; TWSE: 2303) (“UMC”), today reported unaudited net sales for the month of December 2017.

Revenues for December 2017

                        Period       2017       2016       Y/Y Change       Y/Y (%) December       10,667,683       12,557,760       -1,890,077       -15.05% Jan.-Dec.       149,284,706       147,870,124       +1,414,582       +0.96%  

(*) All figures in thousands of New Taiwan Dollars (NT$), except for percentages.(**) All figures are consolidated

Additional information about UMC is available on the web at http://www.umc.com.

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Investor RelationsUMCMichael Lin / David Wong, + 886-2-2658-9168, ext. 16900jinhong_lin@umc.comdavid_wong@umc.com