UMC Reports Sales for May 2014

Taipei, Taiwan, June 9, 2014--United Microelectronics Corporation (NYSE: UMC; TWSE: 2303) (“UMC”), today reported unaudited net sales for the month of May 2014.

Revenues for May 2014

Period	2014	2013	Y/Y Change	Y/Y (%)
May	11,930,014	10,863,111	+1,066,903	+9.82%
Jan.-May	55,152,339	48,925,254	+6,227,085	+12.73%

(*) 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.