UMC Reports Sales for April 2013

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

Revenues for April 2013

Period	2013	2012	Y/Y Change	Y/Y (%)
April	10,280,727	10,367,739	- 87,012	- 0.84%
Jan.-Apr.	38,062,143	36,637,173	1,424,970	3.89%

(*) 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.