Exhibit 8.1

List of Significant Subsidiaries of United Microelectronics Corporation

Company	Jurisdiction of Incorporation	Percentage of Ownership as of December 31, 2012
UMC Group (USA)	California, U.S.A.		100.00	%
United Microelectronics (Europe) B.V.	The Netherlands		100.00	%
UMC Capital Corp.	Cayman Islands		100.00	%
TLC Capital Co., Ltd.	Taiwan, R.O.C.		100.00	%
UMC New Business Investment Corp.	Taiwan, R.O.C.		100.00	%
Green Earth Limited	Samoa		100.00	%
Fortune Venture Capital Corp.	Taiwan, R.O.C.		100.00	%
UMC Japan	Japan		100.00	%
UMC Investment (Samoa) Limited	Samoa		100.00	%
Unitruth Investment Corp.	Taiwan, R.O.C.		100.00	%
UMC Capital (U.S.A)	California, U.S.A.		100.00	%
ECP VITA PTE. LTD.	Singapore		100.00	%
Soaring Capital Corp.	Samoa		100.00	%
Unitruth Advisor (Shanghai) Co., Ltd.	China		100.00	%
Tera Energy Development Co., Ltd.	Taiwan, R.O.C.		100.00	%
Nexpower Technology Corp.	Taiwan, R.O.C.		57.33	%
Wavetek Microelectronics Corporation	Taiwan, R.O.C.		74.69	%
Everrich Energy Corp.	Taiwan, R.O.C.		89.38	%
Everrich Energy Investment (HK) Limited	China		89.38	%
Everrich (Shandong) Energy Co., Ltd.	China		89.38	%
Unistars Corp.	Taiwan, R.O.C.		72.04	%
Topcell Solar International Co. Ltd.	Taiwan, R.O.C.		69.91	%
Smart Energy Enterprises Limited	China		89.38	%
Smart Energy ShanDong Corporation	China		89.38	%
Wavetek Microelectronics Investment (HK) Limited	China		74.69	%
NPT Holding Limited	Samoa		57.33	%
NLL Holding Limited	Samoa		57.33	%
SOCIALNEX ITALIA 1 S.R.L.	Italy		57.33	%
TERA ENERGY USA INC.	U.S.A.		100.00	%
UMC (BEIJING) LIMITED	China		100.00	%