United Microelectronics Corp. is principally engaged in the semiconductor foundry business. The Company offers complementary metal-oxide semiconductor (CMOS) logic wafers, mixed signal wafers, radio frequency (RF) CMOS wafers, embedded memory products, high voltage integrated circuits (ICs) and CMOS image sensors, among others. The Company distributes its products primarily in North America, Asia and Europe. On June 3, 2014, it merged with its two indirectly wholly owned subsidiaries, Union Energy Development Co., Ltd. and EverRich Energy Corporation.