UMC Reports Sales for May 2012

Taipei, Taiwan, June 8, 2012--United Microelectronics Corporation (NYSE: UMC; TWSE: 2303) (“UMC”), today reported unaudited net sales for the month of May 2012.

Revenues for May 2012

Period	2012	2011	Y/Y Change	Y/Y (%)	M/M (%)
May	9,206,251	9,400,051	-193,800	-2.06%	+0.89%
Jan.-May	42,096,140	47,081,817	-4,985,677	-10.59%	N/A

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

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