UMC Reports Sales for March 2013

Taipei, Taiwan, April 10, 2013--United Microelectronics Corporation (NYSE: UMC; TWSE: 2303) (“UMC”), today reported unaudited net sales for the month of March 2013.

Revenues for March 2013

Period	2013	2012	Y/Y Change	Y/Y (%)
March	9,598,645	8,982,404	+616,241	+6.86%
Jan.-Mar.	27,781,416	26,269,434	+1,511,982	+5.76%

(*) 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.