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

Revenues for September 2017

Period         2017         2016         Y/Y Change         Y/Y (%) September         11,865,021         12,735,087         -870,066         -6.83% Jan.-Sep.         112,654,032         109,564,185         +3,089,847         +2.82%

(*) 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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UMCInvestor RelationsMichael Lin / David Wongjinhong_lin@umc.com / david_wong@umc.comTel: + 886-2-2658-9168, ext. 16900