UMC Reports Sales for May 2013

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

Revenues for May 2013

Period	2013	2012	Y/Y Change	Y/Y (%)
May	10,863,111	10,328,599	+534,512	+5.18%
Jan.-May	48,925,254	46,965,772	+1,959,482	+4.17%

(*) 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.