[Description 99.1 Announcement on 2010/04/20: To announce related materials on acquisition of machinery and equipment 99.2 Announcement on 2010/04/23: To announce related materials on acquisition of machinery and equipment 99.3 Announcement on 2010/04/23: To announce related materials on acquisition of machinery and equipment 99.4 Announcement on 2010/04/28: To announce its unconsolidated operating results for the first quarter of 2010 99.5] [FORM 6-K May 24, 2010 United Microelectronics Corporation ——————————————————————————————————— No. 3 Li Hsin Road II ——————————————————————————————————— x x n/a United Microelectronics Corporation Chitung Liu Chitung Liu Chief Financial Officer Description 99 6K on 05/24/2010 6-K 1 htm_5022.htm LIVE FILING]

[UNITED MICROELECTRONICS CORPORATION Address: No. 3 Li-Hsin Road II, Hsinchu Science Park, Hsinchu City, Taiwan, R.O.C. Telephone: 886-3-578-2258 The reader is advised that these financial statements have been prepared originally in Chinese. In the event of a conflict between these financial statements and the original Chinese version or difference in interpretation between the two versions, the Chinese language financial statements] [Form 6-K April 30, 2010 United Microelectronics Corporation Hsinchu, Taiwan, R.O.C. No. 3 Li Hsin Road II þ o o o o þ n/a United Microelectronics Corporation Chitung Liu Chief Financial Officer Description 99.1 6-K 1 c99786e6vk.htm FORM 6-K]

[Description 99.1 Announcement on 2010/03/19: To announce related materials on acquisition of machinery and equipment 99.2 Announcement on 2010/03/19: To announce related materials on acquisition of machinery and equipment 99.3 Announcement on 2010/03/22: To announce related materials on acquisition of machinery and equipment 99.4 Announcement on 2010/03/22: To announce accumulative shares repurchased exceeding NTD$300 million in value 99.5 Announcement on] [FORM 6-K April 20, 2010 United Microelectronics Corporation ——————————————————————————————————— No. 3 Li Hsin Road II ——————————————————————————————————— x x n/a United Microelectronics Corporation Chitung Liu Chitung Liu Chief Financial Officer Description 99 6K on 04/20/2010 6-K 1 htm_4928.htm LIVE FILING]

[Description 99.1 Announcement on 2010/02/22: To announce related materials on acquisition of machinery and equipment 99.2 Announcement on 2010/02/22: To announce accumulative shares repurchased exceeding NTD$300 million in value 99.3 Announcement on 2010/02/25: To announce accumulative shares repurchased exceeding NTD$300 million in value 99.4 Announcement on 2010/03/01: To announce accumulative shares repurchased exceeding NTD$300 million in value 99.5 Announcement on] [FORM 6-K March 19, 2010 United Microelectronics Corporation ——————————————————————————————————— No. 3 Li Hsin Road II ——————————————————————————————————— x x n/a United Microelectronics Corporation Chitung Liu Chitung Liu Chief Financial Officer Description 99 6K on 03/19/2010 6-K 1 htm_4859.htm LIVE FILING]

[th Subject: Announcement regarding the Impact on the Company’s Financial and Business Status from the Earthquake occurring on March 4 th Contents:] [FORM 6-K March 4, 2010 United Microelectronics Corporation ——————————————————————————————————— No. 3 Li Hsin Road II ——————————————————————————————————— x x n/a United Microelectronics Corporation Chitung Liu Chitung Liu Chief Financial Officer Description 99 6K on 03/04/2010 6-K 1 htm_4818.htm LIVE FILING]