[Description 99.1 Announcement on 2010/01/22: Represent subsidiary TLC Capital Co, Ltd. to announce related materials on investment of mainland Chinese company 99.2 Announcement on 2010/01/25: Represent subsidiary Fortune Venture Capital Corp.to announce related materials on disposal of PixArt Imaging Inc. securities 99.3 Announcement on 2010/02/02: Represent subsidiary UMC New Business Investment Corporation to announce the cquisition of TOPCELL SOLAR INTERNATIONAL] [FORM 6-K February 22, 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 02/22/2010 6-K 1 htm_4791.htm LIVE FILING]

[Description 99.1 Announcement on 2009/12/21: To announce the earthquake of December 19, 2009 has no significant impact on the Company’s financial and business operation 99.2 Announcement on 2009/12/23: Represent subsidiary United Lighting Opto-Electronic Inc. to announce related materials on investment of mainland Chinese company 99.3 Announcement on 2009/12/23: To announce related materials on acquisition of machinery and equipment 99.4 Announcement] [FORM 6-K January 29, 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 01/20/2010 6-K 1 htm_4721.htm LIVE FILING]

[Description 99.1 Announcement on 2009/11/26: To announce related materials on acquisition of machinery and equipment 99.2 Announcement on 2009/11/30: Represent subsidiary TLC Capital Co, Ltd. to announce related materials on investment of mainland Chinese company 99.3 Announcement on 2009/11/30: To Announce the Issuance of the 3rd Unsecured Overseas Exchangeable Bonds Due 2014 99.4 th Announcement on 2009/11/30: To Announce the] [FORM 6-K December 21, 2009 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 12/21/2009 6-K 1 htm_4625.htm LIVE FILING]

[UMC Announces Completion of Tender Offer to UMC Japan Taipei, Taiwan, R.O.C. – December 15, 2009 The goal was to obtain common stocks, preemptive rights and stock acquisition rights in UMCJ through a tender offer (the “Tender Offer”) made by UMC’s 100% owned subsidiary, Alpha Wisdom Limited, starting from October 29, 2009 to December 14, 2009. As of the last] [Form 6-K December 15, 2009 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 12/15/2009 6-K 1 htm_4599.htm LIVE FILING]